JP6378069B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator provided with a door opening device.

  With the increase in size of refrigerators, various types of devices equipped with an opening device that opens a door by a switch operation have been proposed. As this type of opening device, for example, a device that opens a rotary door using an electromagnetic actuator (solenoid) is described (see Patent Document 1). Various refrigerators have been proposed for applying torque in a closing direction or an opening direction to a rotary door. As this type of closer, for example, a door is described in which an opening angle of the door is greater than or equal to a predetermined angle and a rotational torque in the opening direction is applied to the door, and a rotational torque in the closing direction is applied to the door at or below the predetermined angle. (See Patent Document 2).

JP 2009-186141 A European Patent Application No. 2573491

  By the way, in the refrigerator which combined the door opening apparatus described in Patent Document 1 and the closer described in Patent Document 2, the door is opened to a position where rotational torque in the opening direction can be applied by the door opening apparatus. The door can be released by the function of the closer. However, in Patent Document 1, since an electromagnetic actuator (solenoid) is used, speed control cannot be performed when the door is opened, and when the size of the electromagnetic actuator increases due to an increase in the size of the door, there is a problem that the door opens excessively. .

  An object of the present invention is to solve the conventional problems described above, and an object of the present invention is to provide a refrigerator capable of performing a door opening operation without a sense of incongruity even when the door is enlarged.

The present invention provides a heat insulating box having an opening on the front surface, a rotary door that opens and closes the opening, a door opening device that operates the door from a closed state to an open state, and the weight of the door. A rotation torque applying member that applies a rotation torque in the closing direction and a rotation torque in the opening direction, and the door opening device includes a motor capable of rotating in both forward and reverse directions, while reducing the rotation of the motor. A gear portion that transmits a driving force of the motor, and a projecting member that pushes the door from the closed state to the open state via the driving force of the gear portion, and the rotational torque applying member includes: A first rotational torque applying portion that applies rotational torque in the closing direction to the door when the opening angle is less than a first predetermined angle; and the opening with respect to the door when the opening angle of the door is equal to or greater than a first predetermined angle. Apply rotational torque in the direction A second rotational torque applying portion, and a third rotational torque applying portion opening angle of the door to impart the rotational torque of the closing direction with respect to the first predetermined angle is greater than a second the door at a predetermined angle or more, the The rotational torque applying member includes a fixed side first inclined surface as the first rotational torque applying portion and a fixed side as the second rotational torque applying portion on an upper surface of the fixed ring portion attached to the heat insulating box. A second inclined surface, a fixed-side torque applying portion in which a fixed-side third inclined surface is successively formed along a circumferential direction as the third rotational torque applying portion, and a movable-side ring portion attached to the door A movable-side first inclined surface as the first rotational torque applying portion, a movable-side second inclined surface as the second rotational torque applying portion, so that the fixed-side ring portion is shaped upside down on the lower surface of The third rotation The movable side third inclined surface is formed in order along the circumferential direction opposite to the fixed side torque applying unit, and the door is in the closed state. When the stationary side first inclined surface and the movable side first inclined surface are in partial contact with each other, rotational torque in the closing direction is applied to the door, and when the door opens more than the second predetermined angle, The movable side first inclined surface is brought into contact with the fixed side third inclined surface, and the movable side third inclined surface is brought into contact with the fixed side first inclined surface, whereby the opening direction with respect to the door. The rotational torque of the door is generated by generating the rotational torque in the closing direction, and the door opening angle when the door is pushed open from the closed state to the open state by the protruding member is set to be less than the first predetermined angle. And the pushing force of the protruding member is the first tilt on the movable side. The slope is set to a force capable of overcoming the fixed-side first inclined surface .

  ADVANTAGE OF THE INVENTION According to this invention, even if a door enlarges, it can be a refrigerator which can perform door opening operation without a sense of incongruity.

It is a front view which shows the state which opened the door of the refrigerator which concerns on this embodiment. It is a front view of a refrigerator. It is a sectional side view which shows the AA cross section of FIG. 2 typically. It is a top view of the refrigerator seen from the B direction of FIG. The refrigerator closer is shown, (a) is a perspective view showing the door closed and when the door is opened, (b) is an enlarged perspective view showing a state where the movable side torque applying part is looked up from below, and a fixed side torque applying part. FIG. (A)-(f) is operation | movement explanatory drawing of the closer of a refrigerator. It is a perspective view of a door opening device in an embodiment of the present invention. It is a top view of a door opening device. It is CC sectional drawing of FIG. It is a perspective view which shows the large gear and intermittent drive gear of a door opening apparatus. It is DD sectional drawing of FIG. It is a top view which shows the rotation board and connecting plate of a door opening apparatus. It is EE sectional drawing of FIG. It is FF sectional drawing of FIG. (A) is a perspective view of a detection switch operation part provided with a switch lever and a detection switch, (b) is an exploded perspective view of a detection switch operation part. It is arrangement | positioning explanatory drawing of the cam part and switch lever in a door opening apparatus. (A)-(f) is a top view which shows typically the positional relationship of the large gearwheel in a door opening apparatus, an intermittent drive gearwheel, and a switch lever. It is a figure explaining the rotation operation of a cam part in the case of the left door opening operation | movement of a door opening apparatus, and the ON / OFF state of a detection switch. It is a figure explaining the rotation operation of a cam part in the case of the right side door opening operation | movement of a door opening apparatus, and the ON / OFF state of a detection switch. It is a figure explaining the ON / OFF state of a detection switch in the case of the left door opening operation | movement of a door opening apparatus, and the right door opening operation | movement. It is a top view of the door opening apparatus which shows the state in which the left protrusion member is protruding. It is a top view of the door opening apparatus which shows the state in which the left protrusion member is protruding. It is a top view of the door opening apparatus which shows the state in which the left protrusion member is protruding. It is a top view of the door opening apparatus which shows the state in which the left protrusion member is protruding. It is a top view of the door opening apparatus which shows the state in which the left protrusion member is protruding. It is a top view of the door opening apparatus which shows the state in which the right side protrusion member is protruding. It is a top view of the door opening apparatus which shows the state in which the right side protrusion member is protruding. It is a top view of the door opening apparatus which shows the state in which the right side protrusion member is protruding. It is a top view of the door opening apparatus which shows the state in which the right side protrusion member is protruding. It is a top view of the door opening apparatus which shows the state in which the right side protrusion member is protruding. (A)-(e) is explanatory drawing of the door opening operation | movement of the right-and-left door by a door opening apparatus. It is a graph which shows the relationship between the opening angle of a door at the time of opening the closed door, and door opening force. (A) is a graph which shows the relationship between the angular velocity of the preferable door at the time of opening a door, and opening time, (b) is a graph which shows the relationship between the opening angle of a door and opening time. (A)-(f) is operation | movement explanatory drawing of the rotating plate and connection plate in a door opening apparatus. (A) is a graph which shows the relationship between speed and time when a protrusion member protrudes, (b) is a graph which shows the relationship between force and time. (A) is explanatory drawing which shows the relationship between the speed of a protrusion member at the time of protruding the left protrusion member, and the speed of the edge part of a freezer compartment door, (b) is at the time of protruding the right protrusion member It is explanatory drawing which shows the relationship between the speed of a protrusion member, and the speed of the edge part of a refrigerator compartment door. It is a top view which shows typically a suitable example of a door opening apparatus. It is a block diagram which shows the structure of the control system of a door opening apparatus. It is a flowchart which shows the control procedure of the initialization operation | movement of a door opening apparatus. It is a flowchart which shows the control procedure of the left side door opening operation | movement which the control part of a door opening apparatus performs. It is a flowchart which shows the control procedure of the right side door opening operation | movement which the control part of a door opening apparatus performs. It is a timing chart which shows each operation of a door opening switch, a detection switch, and a motor at the time of left door opening operation in a door opening device. It is a timing chart which shows each operation | movement of a door opening switch, a detection switch, and a motor at the time of the right side door opening operation | movement in a door opening apparatus. (A) And (b) is operation | movement explanatory drawing when a protrusion member contacts the planar contact surface of a freezer compartment door. (A) And (b) is operation | movement explanatory drawing when a protrusion member contact | abuts to the contact surface which consists of a semicircular cylinder peripheral surface of a freezer compartment door. It is a top view of the door opening apparatus which has a waterproof rib. It is a top view which shows the modification of a rotating plate and a connection plate. (A)-(f) is operation | movement explanatory drawing of the rotating plate and connection plate which concern on a modification. (A) is a graph showing the relationship between speed and time when the protruding member protrudes in association with the rotating plate and the connecting plate according to the modification of FIG. 47, and (b) shows the force and time. It is a graph which shows the relationship.

  Hereinafter, an example for carrying out the present invention (hereinafter referred to as “embodiment”) will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted. Further, in the following description, the vertical and horizontal directions are based on the vertical and horizontal directions shown in FIG. 1, and the front and rear directions are based on the front and rear directions shown in FIG.

≪Overall configuration of refrigerator≫
Drawing 1 is a front view showing the state where the door of the refrigerator concerning this embodiment was opened.
As shown in FIG. 1, the refrigerator 1 according to the present embodiment is a so-called side-by-side type in which a storage room has a structure that is largely divided into left and right sides, a freezer compartment door (door) 2a (hereinafter, door 2a). And a refrigerator compartment door (door) 2b (hereinafter abbreviated as door 2b), a heat insulating box 10, hinges 17a and 17b, a door opening device 60, and the like. The present invention is not limited to the two-door type refrigerator 1 and can be applied to a three-door or more type refrigerator in which the door 2b is further divided into upper and lower parts, for example.

  The heat insulating box 10 is configured by injecting a foam heat insulating material (foamed polyurethane) between the inner box 10i and the outer box 10o and foaming. Moreover, a some vacuum heat insulating material (not shown) is mounted in the inside of the heat insulation box 10 as needed.

  The heat insulation box 10 is formed in a square box shape having a rectangular opening 10s, 10t on the front surface by a ceiling wall 10a, a bottom wall 10b, left and right side walls 10c, 10c, and a back wall 10d. Moreover, the heat insulation box 10 has the heat insulation partition wall 10e extended in the up-down direction in the approximate center of the width direction (left-right direction), and dividing the inside into a left-right direction. With this heat insulating partition wall 10e, the inside of the heat insulating box 10 is partitioned into a freezer compartment 10g and a refrigerator compartment 10h.

  The door 2a is a rotary door that opens and closes the freezer compartment 10g (the opening 10s of the heat insulating box 10), and rotates around the hinge 17a. Although not shown, a rectangular frame-shaped door packing 15 containing a magnet is attached to the inner peripheral surface of the door 2a. When the door 2a is closed, the door packing 15 is attached to the ceiling wall. The freezer compartment 10g is hermetically sealed by being adsorbed to the front surfaces of 10a, the bottom wall 10b, the left side wall 10c, and the heat insulating partition wall 10e. The door 2b is also configured in the same manner as described above, and rotates about the hinge 17b so that the refrigerator compartment 10h can be sealed by the door packing 15. Thus, the doors 2a and 2b of the present embodiment are applied to a rotary type instead of a drawer type.

FIG. 2 is a front view of the refrigerator.
As shown in FIG. 2, the refrigerator 1 includes a door 2a provided with a left door switch 48a and a door 2b provided with a right door switch 48b. By operating the left opening switch 48a, the door 2a is pushed and opened by the opening device 60, and by operating the right opening switch 48b, the door 2b is pushed and opened. Note that the left door switch 48a and the right door switch 48b in the present embodiment can be appropriately selected such as a touch panel type or a push button type.

FIG. 3 is a side sectional view schematically showing the AA section of FIG. 2.
As shown in FIG. 3, the refrigerator 1 includes a cold air duct 5, a compressor 6, a cooler 7, a defrost heater 8, an internal fan 9, a control board 41, and the like. In the refrigerator 1, a refrigeration cycle is configured by combining the compressor 6 and the cooler 7. An internal fan 9 is provided in the cold air duct 5, and the cold air generated by heat exchange in the cooler 7 is sent to the freezer compartment 10 g and the refrigerator compartment 10 h to cool the interior.

  The control board 41 is provided on the upper surface side of the ceiling wall 10a of the refrigerator 1, and is mounted with a CPU, a memory such as a ROM and a RAM, an interface circuit, and the like. The refrigerator 1 includes a refrigerating room temperature sensor (not shown) for detecting the temperature of the refrigerating room 10 h, a freezing room temperature sensor (not shown) for detecting the temperature of the freezing room 10 g, and a cooler temperature for detecting the temperature of the cooler 7. A temperature sensor such as a sensor (not shown) is provided, and the detected temperature is input to the control board 41.

  The control board 41 is connected to a door sensor (not shown) that detects the open / closed state of the doors 2a and 2b, a left door switch 48a (see FIG. 2), and a right door switch 48b (see FIG. 2). Yes.

  Further, the control board 41 controls the ON / OFF of the compressor 6 and the rotational speed, the ON / OFF of the internal fan 9 and the rotational speed, and the outside blower (non-storage fan) by a program previously installed in the ROM. Controls the operation of the entire refrigerator by controlling ON / OFF, rotation speed, etc. (not shown), ON / OFF of an alarm (not shown) for notifying the door open state, operation of the door opening device 60, etc. Can be done.

  The opening device 60 is provided adjacent to the rear of the door 2a (2b) on the upper surface of the ceiling wall 10a of the refrigerator 1. Moreover, the door opening apparatus 60 is arrange | positioned in the position which opposes both the door 2a and the door 2b.

FIG. 4 is a plan view of the refrigerator as viewed from the direction B of FIG.
As shown in FIG. 4, the door opening device 60 includes projecting members 61a and 61b corresponding to the doors 2a and 2b, respectively. The protruding members 61a and 61b operate so as to protrude toward the doors 2a and 2b from the state accommodated in the door opening device 60, and push the doors 2a and 2b near the upper ends to push the doors 2a and 2b open. The door opening device 60 will be described in more detail later.

Here, a suitable angle when opening the door 2a will be described using the door 2a as an example.
When the protruding member 61a of the opening device 60 acts on the left door 2a by the maximum protruding amount H2, the door 2a opened at the maximum opening angle θmax is indicated by a broken line in FIG.

  If the distance of the protruding member 61a from the hinge 17a is Rda and the maximum protruding amount of the protruding member 61a is H2, the open angle θmax of the freezer compartment door 2a when the protruding member 61a protrudes most is θmax = arctan (maximum Projecting amount H2 / distance Rda), which is determined by the projecting amount of the projecting member 61a of the door opening device 60 and the distance from the hinge 17a. In the present embodiment, θmax is set to 10 °, for example.

≪Closer≫
FIG. 5 shows a refrigerator closer, (a) is a perspective view showing when the door is closed and when the door is open, and (b) is an enlarged perspective view showing a state in which the movable side torque applying portion is looked up from below, and a fixed state. It is an expansion perspective view which shows a side torque provision part. In FIG. 5B, the movable side torque applying unit and the fixed side torque applying unit are shown with different angles.
As shown in FIG. 5A, the closer 37 (rotational torque applying member) in this embodiment includes a fixed torque applying portion 38 attached to the heat insulating box 10 and a movable torque applying portion 39 attached to the door 2a. And is configured.

  The fixed-side torque applying portion 38 includes a circular ring portion 38a and a fixing portion 38b that extends radially outward from the ring portion 38a and fixes the ring portion 38a to the heat insulating box 10 with screws. . Further, the fixed-side torque applying portion 38 is fixed to the upper surface of the leg portion 10 u extending forward from the heat insulating box 10.

  The movable side torque applying portion 39 includes a circular ring portion 39a, a fixing portion 39b that extends radially outward from the ring portion 39a and screws the ring portion 39a to the lower surface of the door 2a, and is coaxial with the ring portion 39a. And a cylindrical portion 39c that protrudes upward. The cylindrical portion 39c is fixed so as to be embedded upward from the lower surface of the door 2a. Although not shown, a shaft portion that protrudes from the leg portion 10u through the ring portions 38a and 39a and rotatably supports the door 2a is formed.

  The ring portion 38a and the ring portion 39a are arranged coaxially with each other, and are configured such that the ring portion 39a abuts against the upper surface of the ring portion 38a by the weight of the door 2a.

  As shown in FIG. 5 (b), the fixed-side torque applying portion 38 has a first inclined surface 38c (first rotating torque applying portion) and a second inclined surface 38d (second rotating torque applying) on the upper surface of the ring portion 38a. Part), a third inclined surface 38e (third rotational torque applying part) and a horizontal plane 38f (rotating torque non-applying part). The fixed-side torque applying portion 38 is formed with a first inclined surface 38c, a second inclined surface 38d, a third inclined surface 38e, and a horizontal plane 38f successively in order along the circumferential direction.

  The first inclined surface 38c generates a rotational torque in the closing direction with respect to the door 2a (see FIG. 5A). The second inclined surface 38d generates a rotational torque in the opening direction with respect to the door 2a. The third inclined surface 38e generates a rotational torque in the closing direction with respect to the door 2a. The horizontal surface 38f does not generate rotational torque with respect to the door 2a. An angle range in which the first inclined surface 38c is formed, an angle range in which the second inclined surface 38d is formed, an angle range in which the third inclined surface 38e is formed, and an angle range in which the horizontal surface 38f is formed. The combined angle is set to approximately 180 °.

  The second inclined surface 38d is formed with a gentler (smaller) inclination angle than the first inclined surface 38c and the third inclined surface 38e. Further, a first inclined surface 38c, a second inclined surface 38d, a third inclined surface 38e, and a horizontal surface 38f are formed on the upper surface of the ring portion 38a so as to be point-symmetric about the axis of the ring portion 38a. Yes.

  The movable-side torque applying portion 39 has a first inclined surface 39d, a second inclined surface 39e, and a third inclined surface on the lower surface of the ring portion 39a so as to be line-symmetrical (upside down) with the ring portion 38a. A surface 39f and a horizontal surface 39g are formed. That is, the first inclined surface 39d (first rotational torque applying unit), the second inclined surface 39e (second rotational torque applying unit), and the third inclined surface in order along the circumferential direction opposite to the ring portion 38a. 39f (third rotational torque applying portion) and a horizontal surface 39g (rotating torque non-applying portion) are formed.

  39 d of 1st inclined surfaces generate | occur | produce the rotational torque of a closing direction with respect to the door 2a. The second inclined surface 39e generates rotational torque in the opening direction with respect to the door 2a. The third inclined surface 39f generates rotational torque in the closing direction with respect to the door 2a. The horizontal surface 39g stops the generation of torque for the door 2a.

  The inclination angles of the second inclined surfaces 38d and 39e are formed to be smaller than the inclination angles of the first inclined surfaces 38c and 39d and the third inclined surfaces 38e and 39f. Further, the inclination angles of the first inclined surfaces 38c and 39d are formed to be approximately the same as the inclination angles of the third inclined surfaces 38e and 39f. The angle range of the first inclined surfaces 38c and 39d is set to, for example, 15 °, the angle range of the second inclined surfaces 38d and 39e is set to, for example, 75 °, and the angle range of the third inclined surfaces 38e and 39f. Is set to 15 °, for example.

  Thus, in the present embodiment, the first inclined surface 38c and the first inclined surface 39d constitute the “first rotational torque applying portion” as defined in the claims, and the second inclined surface 38d and the second inclined surface 38d. The surface 39e constitutes a “second rotational torque applying portion” as defined in the claims, and the third inclined surface 38e and the third inclined surface 39f constitute the “third rotational torque applying portion” as defined in the claims. The horizontal plane 38f and the horizontal plane 39g constitute a “rotational torque non-applying portion” as defined in the claims.

  FIGS. 6A to 6F are operation explanatory views of the refrigerator closer. 6A to 6F, on the left side, the first inclined surfaces 38c and 39d, the second inclined surfaces 38d and 39e, the third inclined surfaces 38e and 39f, and the horizontal surfaces 38f and 39g of the closer 37 are developed. In addition, only a range of 180 ° is shown as an example, and a perspective view of the closer 37 is shown on the right side. 6A to 6F, what is shown on the lower side is the main body side, that is, the fixed side, and what is shown on the upper side is the door side, that is, the movable side. 6 (a) shows a state in which the door 2a is in a closed state (0 ° state), FIG. 6 (b) shows a state in which the opening angle of the door 2a (hereinafter referred to as an opening angle) is 15 °, and FIG. c) is a state where the opening angle of the door 2a is 30 °, FIG. 6 (d) is a state where the opening angle of the door 2a is 90 °, and FIG. 6 (e) is a state where the opening angle of the door 2a is 105 °. FIG. 6E shows a state in which the opening angle of the door 2a is 120 °. 6 (b) to 6 (f), the broken line indicates the position of the door 2a in the closed state (0 ° state) shown in FIG. 6 (a).

  As shown in FIG. 6A, when the door 2a is in the closed state, the first inclined surface 39d on the door side (movable side) contacts the first inclined surface 38c on the main body side (fixed side). The closed state means not the state where the door 2a is about to close but the state where it is actually closed (the same applies to the door 2b). In this case, the first inclined surface 38c slides down on the first inclined surface 39d by the dead weight G of the door 2a, thereby generating a closing force indicated by the arrow F1. The closing force here means a rotational torque (see an arrow W1 in the perspective view) that operates the door 2a in the closing direction (closing direction). Thus, before the door 2a is completely closed, a so-called half door is prevented by generating a rotational torque in the closing direction with respect to the door 2a.

  When the door 2a is closed, the first inclined surface 38c on the main body side (fixed side) and the first inclined surface 39d on the door side (movable side) are in partial contact. That is, the entire surface of the first inclined surface 38c and the entire surface of the first inclined surface 39d are not in contact with each other, but the upper portion of the first inclined surface 38c and the lower portion of the first inclined surface 39d are in contact with each other. Thereby, since the closing force F1 is always generated with respect to the door 2a, it is possible to prevent the door 2a from being inadvertently opened due to an external factor or the like.

  As shown in FIG. 6B, when the door 2a is opened at ψ1 (first predetermined angle / for example, 15 °), the first inclined surface 38c and the second inclined surface 38d on the main body side (fixed side) The vertex 39s at the boundary between the first inclined surface 39d on the door side (movable side) and the second steep slope 39e abuts on the vertex 38s at the boundary. In this case, even if the dead weight G of the door 2a acts, neither the closing force (rotating torque in the closing direction) for closing the door 2a nor the opening force (rotating torque in the opening direction) for opening the door 2a is generated. The state where the opening angle is stopped at the position of 15 ° is maintained.

  As shown in FIG. 6C, when the door 2a is opened by 30 °, the second inclined surface 39e on the door side (movable side) abuts on the second inclined surface 38d on the main body side (fixed side). In this case, the opening force shown by the arrow F2 is generated by the second inclined surface 39e sliding down on the second inclined surface 38d by the dead weight G of the door 2a. Here, the opening force means a rotational torque (see an arrow W2 in the perspective view) that operates the door 2a in the opening direction (opening direction).

As shown in FIG. 6D, in the state where the door 2a is opened at ψ2 (second predetermined angle / 90 °, for example), the door side (movable) is placed on the entire surface of the second inclined surface 38d on the main body side (fixed side). The entire surface of the second inclined surface 39e comes into contact. In the process from FIG. 6C to FIG. 6D, the opening force F2 gradually decreases due to the frictional force between the second inclined surface 38d and the second inclined surface 39e, and stops when the door 2a opens 90 °. To do. As described above, the door 2a is stopped at a position opened 90 ° by the second inclined surfaces 38d and 39e, thereby making it easy to take in and out the items in the warehouse.

  As shown in FIG. 6 (e), even if the door 2a opens too much and the door 2a opens 105 °, the door side (movable side) is placed on the third inclined surface 38e on the main body side (fixed side). The first inclined surface 39d abuts, and the door side (movable side) third inclined surface 39f abuts on the main body side (fixed side) first inclined surface 38c. In this case, against the dead weight G of the door 2a, the first inclined surface 39d tries to climb on the third inclined surface 38e, and the third inclined surface 39f tries to climb on the first inclined surface 38c. The opening force (rotational torque in the opening direction) gradually disappears, and a closing force indicated by an arrow F3 is generated. The closing force here means a rotational torque (see an arrow W3 in the perspective view) that operates the door 2a in the closing direction (closing direction). As described above, by providing the third inclined surfaces 38e and 39f, it is possible to brake the door 2a so as not to open too much.

  As shown in FIG. 6 (f), when the door 2a is opened at ψ3 (third predetermined angle / 120 °, for example), a vertex 39s on the door side (movable side) is placed on the horizontal surface 38f on the main body side (fixed side). Further, the door (movable side) horizontal surface 39g contacts the main body side (fixed side) vertex 38s. In this case, the horizontal plane 38f and the apex 39s come into contact with each other, and the apex 38s and the horizontal plane 39g come into contact with each other. An opening force (rotational torque in the opening direction) for opening the door 2a is not generated, and the door 2a maintains a stopped state at the opened position. Thus, since the door 2a can be maintained in a state where it is greatly opened beyond 90 °, usability can be improved.

  As described above, the closer 37 according to the present embodiment generates the rotational torque in the closing direction (see the closing force F1 in FIG. 6A) by the first inclined surfaces 38c and 39d at an opening angle of less than 15 °, for example. . Further, the closer 37 generates a rotational torque in the opening direction (see the opening force F2 in FIG. 6C) by the second inclined surfaces 38d and 39e at an opening angle of 15 ° or more and less than 90 °, for example. Further, the closer 37 generates a rotational torque in the closing direction (see the closing force F3 in FIG. 6E) by the third inclined surfaces 38e and 39f, for example, at an opening angle of 90 ° to less than 105 °. Further, the closer 37 is configured to exhibit non-rotating torque (see FIG. 6F) by the horizontal surfaces 38f and 39g, for example, when the open angle is 105 ° or more. That is, in the closer 37 according to the present embodiment, the closing force F1 is applied to prevent the half door, and the opening force F2 is applied to allow the inside of the cabinet to be taken in and out when opened. The doors 2a and 2b can be released at easy positions, and by applying the closing force F3, the door 2a can be prevented from opening too much, and the rotational torque non-applying portion is provided to Further, it is possible to improve the usability by maintaining a state of being opened wide.

  The closer 37 has the same structure except that the left and right doors 2a and 2b are symmetrical to each other, so only the closer of the left door 2a will be described in detail here. The description of the closer of the door 2b is omitted.

≪Opening device≫
Next, the door opening device 60 in the present embodiment will be described in detail.
FIG. 7 is a perspective view of the door opening device of the present embodiment. FIG. 8 is a plan view of the door opening device.
The front, rear, up, down, left, and right directions in the following description of the door opening device 60 correspond to the front, back, up, down, left, and right of the refrigerator 1 (see FIGS. 2 and 3) to which the door opening device 60 is attached.

  As shown in FIGS. 7 and 8, the door opening device 60 of the present embodiment includes a motor 82 and a reduction gear in a housing formed by a case 62 as a lower half and a cover 69 as an upper half. The main assembly includes a row 83, a large gear 76, a pair of intermittent drive gears 78a and 78b, and a pair of projecting members 61a and 61b.

  Incidentally, as shown in FIGS. 7 and 8, a state in which the protruding members 61 a and 61 b do not protrude from the inside of the case 62 toward the outside thereof may be referred to as an “initial state” of the door opening device 60. The positions of the reduction gear train 83, the large gear 76, the intermittent drive gears 78a and 78b, and the protruding members 61a and 61b in the opening device 60 in the “initial state” may be referred to as “origin positions”. . In the present embodiment, the reduction gear train 83, the large gear 76, the intermittent drive gear 78a, the rotating plate 73a, and the connecting plate 65a constitute a “gear portion” as defined in the claims on the door 2a side. Yes. In the present embodiment, the reduction gear train 83, the large gear 76, the intermittent drive gear 78b, the rotating plate 73b, and the connecting plate 65b constitute a “gear portion” in the claims on the door 2b side. Yes.

<Motor>
The type of the motor 82 is not particularly limited as long as the rotary shaft rotates in both forward and reverse directions. As the motor 82 in the present embodiment, for example, a brush type direct current motor, which can rotate in both the forward direction and the reverse direction by reversing the polarity of the voltage applied to the terminal is assumed. doing.

<Reduction gear train>
The reduction gear train 83 transmits the power to the large gear 76 while reducing the rotation of the motor 82.
The reduction gear train 83 in this embodiment includes a worm gear 84, a worm wheel 85, a second gear 87, a third large gear 88a, a third small gear 88b, and a fourth large gear 90a. And a fourth small gear 90b.

9 is a cross-sectional view taken along the line CC of FIG.
As shown in FIGS. 8 and 9, the worm gear 84 is provided on the rotating shaft of the motor 82 and meshes with the worm wheel 85 that is the first gear. The second gear 87, which is a spur gear, is provided integrally with the worm wheel 85, and both the worm wheel 85 and the second gear 87 are rotatably supported around the worm wheel shaft 86.

The second gear 87 meshes with the third large gear 88a (see FIG. 8), and this third large gear 88a is integrated with the third small gear 88b (see FIG. 8) to form a third support. It is rotatably supported around a shaft 89 (see FIG. 8). Further, the third small gear 88b (see FIG. 8) meshes with the fourth large gear 90a. The fourth large gear 90a is pivotally supported around the fourth support shaft 91 integrally with the fourth small gear 90b. Further, the fourth small gear 90b meshes with teeth 76A and 76B (see FIG. 10) described later of the large gear 76.
That is, the reduction gear train 83 is configured to transmit the rotational force of the motor 82 to the large gear 76 while reducing the rotational force as described above.

An example of the rotation direction of each gear when the motor 82 is rotated is indicated by arrows in FIG.
As an example, the rotation direction of the worm gear 84 is indicated by a solid arrow in the direction in which the worm wheel 85 provided on the worm gear 84 meshes with the helical teeth counterclockwise in a plan view shown in FIG. For example, if the teeth of the worm gear 84 are a left-handed spiral that is the opposite of a general screw, the motor 82 may be rotated clockwise as viewed from the front end side of the worm gear 84. Such a rotation direction is referred to as a “forward rotation direction”.

A case where the worm gear 84 is rotated in the reverse direction by reversing the polarity of the voltage applied to the motor 82 is indicated by a broken-line arrow. In this embodiment, such a rotation direction is referred to as a “reverse direction”. Shall.
Needless to say, “forward rotation” and “reverse rotation” are for convenience of description of the present embodiment, and are not limited to such expressions.

As shown in FIG. 8, such a reduction gear train 83 is disposed closer to the back surface (closer to the rear) than the large gear 76 and in the vicinity of the center of the left and right sides of the case 62. Further, the motor 82 is disposed along the back surface (rear surface) of the case 62 adjacent to the reduction gear train 83. A wiring space 81 in which wiring connectors and wiring (not shown) are arranged is provided on the opposite side of the motor 82 with respect to the reduction gear train 83. That is, the motor 82, the reduction gear train 83, and the wiring space 81 are configured in parallel along the back surface (rear surface) of the case 62.
Although the motor 82 in this embodiment is arranged closer to the left side in the plan view shown in FIG. 8 with respect to the reduction gear train 83, the present invention is not limited to such an arrangement, and the right side It can also be arranged closer to the center or closer to the center.

<Large gear>
FIG. 10 is a perspective view showing a large gear and an intermittent drive gear of the door opening device.
As shown in FIG. 10, gear teeth 76A are provided in the range of the angle θ0 on the outer periphery of the large gear 76 over the entire width in the thickness direction. Outside the range of the angle θ0, a series of teeth 76B that are continuous with the teeth 76A are provided over the entire circumference only on the side close to the case 62 in the thickness direction, that is, approximately on the lower side in the figure. In the upper half of the figure, no tooth is provided, and a cylindrical sliding surface 76C that is the same as or smaller than the root circle of the tooth 76B is provided. At the boundary between the sliding surface 76C and the teeth 76A provided at the full width, a notch 76D that is recessed to the inner peripheral side from the sliding surface 76C is provided.

A large gear stopper 76E is provided on the opposite side of the teeth 76A of the large gear 76. When the large gear 76 rotates by an angle θ6 from the origin position, the large gear stopper 76E rotates by an angle θ6 together with the large gear 76 and comes into contact with the cover stopper 71.
Incidentally, as shown in FIG. 9, the cover stopper 71 is a section formed so as to protrude inward from the cover 69 toward the large gear 76.
The rotational angle range of the large gear 76 is limited to ± θ6 from the origin position by the cover stopper 71 as the mechanical stopper.

<Intermittent drive gear>
11 is a cross-sectional view taken along the line DD of FIG.
As shown in FIGS. 10 and 11, the intermittent drive gear 78a (first intermittent drive gear) is pivotally supported around the rotating plate center 74a, and the intermittent drive gear 78b (second intermittent drive gear) is supported. ) Is pivotally supported around the rotating plate center 74b.

  The intermittent drive gears 78a and 78b include teeth 79a and 79b (see FIG. 10) that mesh with the teeth 76A (see FIG. 10) of the large gear 76, and stopper portions 80a and 80b (see FIG. 10) that partially protrude on the outer peripheral side. Is formed. When the intermittent drive gears 78a and 78b are arranged in a direction in which the stopper portions 80a and 80b are close to the large gear 76, the large gear 76 and the intermittent drive gears 78a and 78b are not meshed with each other as the gear. 80a and 80b are slidable on the sliding surface 76C (see FIG. 10) of the large gear 76.

Further, the tip surfaces of the stopper portions 80a and 80b are arcuate concave surfaces that coincide with the peripheral surface of the sliding surface 76C. That is, the distal end surfaces (concave surfaces) of the stopper portions 80a and 80b and the peripheral surface of the sliding surface 76C are fitted to each other, and the intermittent drive gears 78a and 78b that move on the peripheral surface of the sliding surface 76C are rotated. Even if it is locked, it will not rotate.
Even if the large gear 76 rotates in this state, the tip surfaces (concave surfaces) of the stopper portions 80a and 80b of the intermittent drive gears 78a and 78b only slide on the sliding surface 76C of the large gear 76, so that the intermittent drive gear 78a. 78b do not rotate.

As shown in FIG. 10, the case where the intermittent drive gears 78a and 78b are arranged symmetrically with respect to the range of the angle θ0 of the large gear 76 is referred to as the “origin position” of the large gear 76 here. The “origin position” is not a point but a width. At this “origin position”, the angle from the notch 76D provided on the large gear 76 to the stopper ends 80Aa and 80Ab that are the ends of the stoppers 80a and 80b on the side close to the notch 76D is θ2. To do.
Then, when the large gear 76 rotates clockwise or counterclockwise from the “origin position” within the range of the angle θ2, the intermittent drive gears 78a and 78b are kept locked without being driven to rotate.

When the rotation angle of the large gear 76 from the origin position exceeds θ2, the stopper driving portions 80Aa and 80Ab enter the inside of the notch 76D that is recessed from the sliding surface 76C, so that the intermittent drive gears 78a and 78b rotate. It becomes possible. As a result, the teeth 76A of the large gear 76 and the teeth 79a and 79b of the intermittent drive gears 78a and 78b are sequentially meshed with each other. The large gear 76 rotates the intermittent drive gears 78a and 78b while transmitting torque to the intermittent drive gears 78a and 78b.
As will be described later, the driving force from the motor 82 is transmitted to one of the intermittent drive gears 78a and 78b depending on whether the rotation direction of the large gear 76 is clockwise or counterclockwise. Become.

<Rotating plate and connecting plate>
As shown in FIGS. 8 and 11, the opening device 60 includes a pair of rotating plates 73a and 73b and a pair of connecting plates 65a that transmit the driving force from the intermittent drive gears 78a and 78b to the protruding members 61a and 61b. , 65b.

The rotating plate 73a is pivotally supported around the rotating plate center 74a integrally with the intermittent driving gear 78a, and the rotating plate 73b rotates around the rotating plate center 74b integrally with the intermittent driving gear 78b. It is supported freely.
These rotating plates 73a and 73b and connecting plates 65a and 65b have the same structure except that they are symmetrical in the door opening device 60 as shown in FIGS. Therefore, only the left rotation plate 73a and the connection plate 65a will be described in detail here, and the description of the right rotation plate 73b and the connection plate 65b will be omitted.

FIG. 12 is a plan view showing a rotating plate and a connecting plate of the door opening device.
As shown in FIG. 12, around the rotating plate 73a, teeth 101A, 101B, 101C, 101D, 101E, 101F, 101G, 101H, 101J, 101K, 101M, 101N, 101P (total number of teeth 13 / Hereinafter, the teeth 102a, 102b, 102c, 102d, 102e, 102f, 102g, 102h, 102j, 102k, 102m, 102n, 102p, and 102q (total number of teeth) meshed with the teeth 102A, 102b, 102c, 102d, 102e, 102f, 102g 14 / below, abbreviated as 101a to 102q when all are collectively referred to.

The teeth 102a to 102q of the rotating plate 73a are formed so as to gradually increase in radius from the rotating plate center 74a clockwise around the rotating plate center 74a in the plan view of FIG.
More specifically, when the meshing pitch circle radius from the teeth 102a to the teeth 102q provided on the rotating plate 73a is represented by ra to rq shown in FIG. 12 (where a to q are arranged in alphabetical order, rb To rp are not shown), and ra <rb <rc <rd <re <rf <rg <rh <rj <rk <rm <rn <rp <rq.
The curve drawn by the teeth 102a to 102q of the rotating plate 73a can be an Archimedean spiral, a hyperbolic spiral, an involute curve, or the like, but is limited to these as long as the relational expression is satisfied. It is not a thing.

As shown in FIGS. 7 and 8, the connecting plate 65a is disposed on the left side of the rotating plate 73a (outside in the left-right direction of the case 62).
The connecting plate 65a has a substantially triangular shape, and has a concave portion or a convex portion that is slidably fitted to the guide rail 66a on one side of the left side that is the first side. Further, the rear end portion of the protruding member 61a is joined to one side of the front surface that is the second side. Further, teeth 101A to 101P (see FIG. 12) that mesh with the teeth 102a to 102q (see FIG. 12) when the rotating plate 73a rotates are formed on the remaining third side. That is, as shown in FIG. 12, since the teeth 102a to 102q of the rotating plate 73a are formed so as to gradually increase in radius from the rotating plate center 74a, the tooth row of the teeth 101A to 101P of the connecting plate 65a As it goes from the rear to the rear, the taper is inclined so as to go to the left side of the rotating plate 73a (outside in the left-right direction of the case 62).

The teeth 102a to 102q provided on the rotating plate 73a mesh with the front and rear sides of the teeth 101A to 101P provided on the connecting plate 65a, so that the number of teeth of the rotating plate 73a is larger than the number of teeth of the connecting plate 65a. One more, as described above, the number of teeth of the rotating plate 73a is 14, and the number of teeth of the connecting plate 65a is 13.
The number of teeth of the rotating plate 73a and the number of teeth of the connecting plate 65a are not limited to 14 and 13, but the number of teeth of the rotating plate 73a on the driving side is the connecting plate 65a on the driven side. It is desirable to provide one more than the number of teeth. By setting the number of teeth of the rotating plate 73a and the connecting plate 65a in this way, the teeth of the rotating plate 73a are always meshed with the teeth of the connecting plate 65a sandwiched from both sides. As a result, the clockwise and counterclockwise rotation operations of the rotating plate 73a are stabilized, and the driving force is efficiently transmitted from the rotating plate 73a to the connecting plate 65a.

The rotating plate 73a in the present embodiment rotates counterclockwise in the plan view of FIG. 12 when the door 2a (see FIG. 5) is opened.
As shown in FIG. 12, the teeth 101A on the front end side of the connecting plate 65a mesh with the teeth 102a and 102b on the inner peripheral side of the rotating plate 73a. In the state of the rotating plate 73a and the connecting plate 65a shown in FIG. 12, the protruding member 61a is pulled into the case 62 of the door opening device 60 as will be described later, so that the rotating plate 73a and the connecting plate shown in FIG. The position 65a is the “origin position”.

≪Protruding member≫
As shown in FIGS. 7 and 8, the projecting members 61 a and 61 b are elongate rods having a polygonal cross section such as a quadrangle or a circular cross section, for example, and include an upper half cover 69 and a lower half case 62. It arrange | positions so that each of the left side and right side in the said housing formed may be followed.
The protruding members 61a and 61b are slidably supported on the guide rails 66a and 66b via the connecting plates 65a and 65b so as to be movable along the front-rear direction of the door opening device 60.
Further, the front ends of the protruding members 61a and 61b face the outside of the housing through openings 63a and 63b (see FIG. 8) provided on the front surface of the housing so as to straddle the case 62 and the cover 69.

The protruding members 61a and 61b, which will be described in detail later, are configured to return to their original positions after protruding toward the doors 2a and 2b.
In addition, reinforcing members 68a and 68b made of, for example, stainless steel round bars are attached to the protruding members 61a and 61b along the longitudinal direction thereof. The protruding members 61a and 61b are reinforced by the reinforcing members 68a and 68b. Has been.

Tip members 64a and 64b are provided at the front ends of the protruding members 61a and 61b. Since the tip member 64a and the tip member 64b have the same structure, only the tip member 64a will be described here and description of the tip member 64b will be omitted.
13 is a cross-sectional view taken along line EE in FIG.
As shown in FIG. 13, the tip member 64a is disposed so as to cover the front end of the protruding member 61a facing the outside of the housing through an opening 63a formed in the front surface of the housing.

  The tip member 64a is preferably formed of a flexible material such as rubber. Further, a thin-walled portion 70 is provided on the protruding member 61a side of the tip member 64a so as to cover the opening 63a from the outside of the housing over the entire circumference of the protruding member 61a. If the dimension of the thin member 70 on the side of the protruding member 61a is larger than the dimension of the opening 63a, when the protruding member 61a is drawn into the housing, the thin part 70 closes the opening 63a, and the water enters the housing from the outside. And dust can be prevented from entering. Further, the tip member 64a can reduce an impact when the protruding member 61a performs a protruding operation and comes into contact with the door 2a.

  As shown in FIG. 8, the door opening device 60 is provided with a body attachment hole 59 for attaching the door opening device 60 to the upper surface of the refrigerator 1 (see FIG. 1). The main body mounting holes 59 are provided at two positions on the rear corner of the case 62 and on the left and right sides of the large gear 76 and on the front side of the large gear central shaft 77, and the rotation plate centers 74 a and 74 b of the rotation plate 73 a and the front end of the case 62. It is provided in two places symmetrically so as to be located substantially in the middle of the edge.

14 is a cross-sectional view taken along line FF in FIG.
As a method for attaching the door opening device 60 to the refrigerator 1 through the body attachment hole 59 (see FIG. 8), as shown in FIG. 14, the case 62 and the cover 69 are sandwiched through the rubber bushing 58, and the top surface of the refrigerator 1 is placed. There is a method of tightening the cylindrical boss 57 protruding from the surface using a stepped screw 56. If the door opening device 60 is attached to the refrigerator 1 by such a method, even if vibration is generated when the door opening device 60 is driven, the vibration can be prevented from being transmitted to the refrigerator 1.

<Switch lever and detection switch>
FIG. 15A is a perspective view of a detection switch operation unit including a switch lever and a detection switch that engages with a large gear, and a perspective view showing a state in which the large gear is looked up obliquely from below. FIG. It is a disassembled perspective view of a detection switch operation part. FIG. 16 is an explanatory view of the arrangement of the cam portion and the switch lever in the door opening device. 15A and 16 show the state of the switch lever related to the large gear at the origin position.

  As shown in FIGS. 15A and 15B, the detection switch operating unit includes switch levers 96a and 96b that engage with the cam 99 of the large gear 76, a detection spring 97, and detection switches 95a and 95b. It is mainly prepared.

  The switch levers 96a and 96b are formed of a pair of symmetrical lever members, and shaft support portions 98 and 98 are formed at substantially central portions in the longitudinal direction, respectively. The shaft support portions 98, 98 are supported by a common shaft member (not shown), so that the switch levers 96a, 96b are individually rotatable around the shaft member.

  As shown in FIG. 15 (b), on one end side of the switch levers 96a, 96b in the longitudinal direction, spring protrusions 96Ba, 96Bb (the switch lever 96b in FIG. A spring projection 96Bb on the side is not shown). A detection spring 97 which is a compression spring is hung between the spring protrusions 96Ba and 96Bb.

Further, on one end side of the switch levers 96a and 96b, the switch protrusions 96Aa and 96Ab (on the switch lever 96a side in FIG. 15B) are arranged on the surface opposite to the side where the spring protrusions 96Ba and 96Bb are formed. The protrusion 96Aa is formed with an unillustrated).
The switch protrusions 96Aa and 96Ab are provided with a detection switch 95a and a detection switch 95b facing each other. The detection switches 95a and 95b are constituted by tact switches, for example. That is, when the switch protrusion 96Aa of the switch lever 96a comes into contact with the detection switch 95a, the switch is turned on, and when it is separated, the switch is turned off. Further, when the switch protrusion 96Ab of the switch lever 96b contacts the detection switch 95b, the switch is turned on, and when it is separated, the switch is turned off.

  Further, on the other end side in the longitudinal direction of the switch levers 96a and 96b, switch lever tip portions 96Ca and 96Cb are formed on the surface where the switch levers 96a and 96b face each other. The switch lever tip portions 96Ca and 96Cb are driven by the cam portion 99 (see FIG. 15A) of the large gear 76 (see FIG. 15A) described below by the repulsive force of the detection spring 97 disposed on one end side of the switch levers 96a and 96b. (See FIG. 15A).

As shown in FIG. 15A, a cam portion 99 is formed on the lower surface of the large gear 76 coaxially with the large gear 76 (large gear central shaft 77). The cam portion 99 is a substantially disk-shaped member having two peripheral surfaces with different diameters and having a thickness. The first peripheral surface 99a has a large diameter, and the first peripheral surface 99a has a smaller diameter than the first peripheral surface 99a. And a double circumferential surface 99b.
When the cam portion 99 rotates together with the large gear 76, the switch lever tip portions 96Ca and 96Cb are in sliding contact with the first peripheral surface 99a and the second peripheral surface 99b.

  That is, when the switch lever tip 96Ca slides on the first peripheral surface 99a, the switch protrusion 96Aa of the switch lever 96a is separated from the detection switch 95a and turned off. When the switch lever tip 96Ca slides on the second peripheral surface 99b, the switch protrusion 96Aa of the switch lever 96a comes into contact with the detection switch 95a and the switch is turned on.

When the switch lever tip 96Cb slides on the first peripheral surface 99a, the switch protrusion 96Ab of the switch lever 96b is separated from the detection switch 95b and turned off. When the switch lever tip 96Cb is slidably contacted with the second peripheral surface 99b, the switch protrusion 96Ab of the switch lever 96b comes into contact with the detection switch 95b and the switch is turned on.
That is, the first peripheral surface 99a of the cam portion 99 forms an OFF surface, and the second peripheral surface 99b forms an ON surface.

  At the origin position shown in FIG. 15A, the switch lever tip portions 96Ca and 96Cb are both in contact with the first peripheral surface 99a (OFF surface), and the switch levers 96a and 96b have moved in the direction indicated by solid arrows. In this state, the switch protrusions 96Aa and 96Ab push and contract the detection spring 97 and move away from the detection switches 95a and 95b.

  When the large gear 76 rotates from the origin position and the switch lever tip portions 96Ca and 96Cb move from the first peripheral surface 99a (OFF surface) to the second peripheral surface 99b (ON surface), the switch levers 96a and 96b are detected springs. The switch projections 96Aa and 96Ab push the detection switches 95a and 95b to turn on both the detection switches 95a and 95b.

In the present embodiment, the action of pressing the two switch levers 96a and 96b against the respective detection switches 95a and 95b to turn them on can be realized by the single detection spring 97.
That is, when the large gear 76 is rotated, the cam portion 99 is rotated, so that the switch levers 96a and 96b are rotated, and the detection switches 95a and 95b can be turned ON / OFF according to the rotation angle of the large gear 76.

  Next, an example of suitable ON / OFF of the rotation angle of the large gear 76, the appropriate shape of the cam portion 99, and the detection switches 95a and 95b will be described. FIG. 16 is an explanatory view of the arrangement of the cam portion and the switch lever in the door opening device. In FIG. 16, the shaft support portions of the switch levers 96 a and 96 b are individually drawn with reference numerals 98 a and 98 b for convenience.

As shown in FIG. 16, the cam portion 99 has a first peripheral surface 99a (OFF surface) having a large diameter in the range of the angle φ2 centered on the large gear central shaft 77, and in the other ranges. It has the 2nd surrounding surface 99b (ON surface) with a small diameter.
Further, the switch lever tip portions 96Ca and 96Cb at the origin position are in contact with the first peripheral surface 99a (OFF surface) of the cam portion 99 at two points that form an angle φ1 with the large gear central shaft 77 as a center.

  The first peripheral surface 99a of the cam portion 99 is formed from the contact point with the switch lever tip portions 96Ca and 96Cb to the outside of the angle φ1 up to the range of the angle θ1, and in the “origin position” shown in FIG. Symmetrically, the relational expression θ1 = (φ2−φ1) / 2 is established.

  That is, when the large gear 76 rotates clockwise by the angle θ1 from the “origin position” shown in FIG. 16, the switch lever tip 96Cb is moved from the first peripheral surface 99a (OFF surface) to the second peripheral surface 99b (ON surface). ) And the detection switch 95b is switched from OFF to ON.

  Further, when the large gear 76 rotates clockwise by an angle φ1 and the rotation angle from the “origin position” reaches (φ1 + θ1), the detection switch 95b remains OFF and the switch lever tip 96Ca has the first peripheral surface 99a. It moves from the (OFF surface) to the second peripheral surface 99b (ON surface). That is, the detection switch 95a is switched from OFF to ON.

  On the other hand, when the large gear 76 rotates counterclockwise from the “origin position” by the angle θ1, the switch lever tip 96Ca moves from the first peripheral surface 99a (OFF surface) to the second peripheral surface 99b (ON surface). . That is, the detection switch 95a is switched from OFF to ON.

Further, when the rotation angle from the “origin position” becomes (φ1 + θ1) by rotating counterclockwise by an angle φ1, the detection switch 95a remains OFF, and the switch lever tip 96Cb is positioned on the first circumferential surface 99a (OFF surface). ) To the second peripheral surface 99b (ON surface). That is, the detection switch 95b is switched from OFF to ON.
Here, when the rotation angle from the “origin position” of the large gear 76 or the cam portion 99 is within the range of ± θ1, both the detection switches 95a and 95b are OFF, and the range of this angle ± θ1 is the “origin range”. It shall be called.

Next, the positional relationship among the large gear 76, the intermittent drive gears 78a and 78b, the cam portion 99, and the switch levers 96a and 96b will be described.
FIGS. 17A to 17F are plan views schematically showing the positional relationship among the large gear, the intermittent drive gear, and the switch lever in the door opening device. In FIGS. 17A to 17F, the large gear 76 is rotated clockwise to rotate the left intermittent drive gear 78a, and the left protruding member 61a is protruded to open the left door 2a. The operation | movement which performs door operation | movement is shown. In FIGS. 17A to 17F, only the sliding surface 76C of the large gear 76, the notch 76D, and the tooth 76A of the portion related to the driving of the intermittent drive gear 78 are shown.

  FIG. 17A shows the state of the “origin position”, and the intermittent drive gears 78a and 78b are in a state where the tips of the stopper portions 80a and 80b are fitted and locked with the sliding surface 76C. Further, the switch lever tip portions 96Ca and 96Cb are in contact with the first peripheral surface 99a (OFF surface) of the cam portion 99, and the detection switches 95a and 95b are both OFF (hereinafter, this state is referred to as “detection”. It may be referred to as “switch A / B = OFF / OFF”).

  FIG. 17B shows a state of “moving outside the origin” in which the large gear 76 rotates clockwise from the “origin position” by an angle θ1, and the intermittent drive gears 78a and 78b have the tips of the stopper portions 80a and 80b at the tips. The sliding surface 76C is fitted and locked. Further, the switch lever tip 96Ca is in contact with the first peripheral surface 99a (OFF surface) of the cam portion 99, and the detection switch 95a is OFF. The switch lever tip 96Cb moves from the first peripheral surface 99a (OFF surface) of the cam portion 99 to the second peripheral surface 99b (ON surface), and the detection switch 95b is switched from OFF to ON. That is, the position in FIG. 17B indicates the boundary portion of the “origin range”. Here, the notch 76Da moves to a position close to the stopper end 80Aa in the stopper 80a of the intermittent drive gear 78a (hereinafter, this state may be referred to as “detection switch A / B = OFF / ON”). ).

  FIG. 17C shows a state where the large gear 76 is further rotated to an angle θ2 (> θ1). That is, when the stopper portion 80a of the intermittent drive gear 78a enters the cutout portion 76Da, the locked state is released, and the large gear 76 can engage with the intermittent drive gear 78a ("intermittent gear engagement"). State). As a result, the intermittent drive gear 78a starts to rotate counterclockwise. At this time, the switch levers 96a and 96b remain unchanged from the state shown in FIG. 17B, the detection switch 95a remains OFF, and the detection switch 95b remains ON (detection switch A / B = OFF / ON).

  FIG. 17D shows a state where the large gear 76 is further rotated to an angle θ3 (> θ2), and the intermittent drive gear 78a meshes with the large gear 76 and continues to rotate counterclockwise. . Further, since the rotating plate 73a integrated with the intermittent drive gear 78a also rotates, the protruding member 61a protrudes forward through the connecting plate 65a (“during a protruding operation”). Thereby, the protrusion member 61a performs door opening operation | movement. The switch levers 96a and 96b remain unchanged from the states shown in FIGS. 17B to 17C, the detection switch 95a remains OFF, and the detection switch 95b remains ON (detection switch A / B = OFF / ON). ).

  FIG. 17E shows a state where the large gear 76 is further rotated to an angle θ4 (> θ3), and the protruding member 61a protrudes to near the maximum value of its operating range (“projecting” Just before completion "state). The intermittent drive gear 78a is at a position that is rotated to the maximum. The switch lever tip 96Ca moves from the first peripheral surface 99a (OFF surface) of the cam portion 99 to the second peripheral surface 99b (ON surface), and the detection switch 95a is switched from OFF to ON. The detection switch 95b does not change and remains ON. It is detected that the detection switch 95a is switched from OFF to ON (hereinafter, this state may be referred to as “detection switch A / B = ON / ON”). When the detection switch 95a is switched from OFF to ON, energization to the motor 82 is stopped after a predetermined time (T1) has elapsed, and the motor 82 stops while decelerating. Here, the predetermined time is a time required for further protruding the protruding member 61a (up to the maximum amount) after the detection switch 95a is switched from OFF to ON, and is determined by a preliminary test or the like.

  FIG. 17F shows a state where the large gear 76 has further rotated to an angle θ5 (> θ4), the motor 82 stops, and the protruding member 61a completes the protruding operation and stops (“protrusion completion stop”). "State). The large gear 76 and the intermittent drive gear 78a are in the most rotated position. The switch levers 96a and 96b are not changed from the state shown in FIG. 17E, and both the detection switches 95a and 95b remain ON (detection switches A / B = ON / ON).

  By the way, in order to give moderate acceleration to the door 2a, it is desired to increase the protruding amount of the protruding member 61a. However, when the protruding amount becomes excessive, the large gear stopper 76E collides with the cover stopper 71. On the other hand, the detection position by the detection switch 95a has a tolerance, and must be detected before the large gear stopper 76E hits the cover stopper 71. Therefore, in the present embodiment, by stopping the motor 82 after the elapse of a predetermined time (T1), the amount of protrusion can be maximized and the door opening operation can be stabilized even if detected before the maximum amount of protrusion.

  Thereafter, the door opening device 60 reverses the motor 82 and rotates the large gear 76 in the counterclockwise direction, thereby performing the operation from FIG. 17 (f) to FIG. 17 (a) opposite to the above. Return to the “origin position” again.

  Incidentally, when the opening operation of the right door 2b is performed, the large gear 76 is moved counterclockwise from the "origin position" in the counterclockwise direction opposite to the rotation direction in FIGS. 17 (a) to 17 (f). Rotate. Thus, the intermittent drive gear 78b and the switch levers 96a and 96b perform a symmetrical operation (mirror image) with respect to FIGS. 17 (a) to 17 (f). That is, the intermittent drive gear 78b rotates clockwise to perform the projecting operation of the right projecting member 61b and perform the door opening operation of the right door 2b.

  Next, the rotation operation of the cam portion 99 and the ON / OFF states of the detection switches 95a and 95b when performing the opening operation of the left door 2a and the opening operation of the right door 2b will be described more specifically. explain.

  FIG. 18 is a diagram illustrating the rotation operation of the cam portion and the ON / OFF state of the detection switch during the left-side door opening operation of the door opening device. FIG. 19 is a diagram for explaining the rotation operation of the cam portion and the ON / OFF state of the detection switch during the right-side door opening operation of the door opening device. 18 and 19 are equivalently expressed by converting the rotation operation of the cam portion 99 of the large gear 76 into a linear operation with the horizontal axis as an angle, and a rectangular shape that moves the cam portion 99 left and right. It is illustrated as a convex portion of the shape.

In FIG. 18, the leftward movement in the figure is equivalent to the clockwise rotation (CW direction) of the large gear 76 or the cam portion 99, and the rightward movement in the figure is counterclockwise (CCW direction). It is drawn to be equivalent to motion.
Further, FIG. 19 shows the counterclockwise rotation operation of the cam portion 99 in the door opening operation shown in FIGS. 17A to 17F and the symmetrical door opening operation (the door opening operation of the right door 2b). This is depicted as a movement operation from the “origin position” to the right in the figure.
Moreover, each state shown by (a)-(f) of FIG. 18 and each state shown by (a)-(f) of FIG. 19 respond | corresponds to each state in FIG. 17 (a)-(f). ing.

  The state of FIG. 18A and the state of FIG. 19A are both the same state and indicate the “origin position”. The rotation angle θ of the large gear 76, that is, the cam portion 99 is 0 (θ = 0), and the cam portion 99 is in a position that is symmetrical with respect to the center line (center). The width of the cam portion 99 is a width corresponding to the angle φ2 in FIG. 16, and the detection switches 95a and 95b are arranged with a width corresponding to the angle φ1 in FIG. Further, in the “origin position”, the detection switches 95 a and 95 b are arranged at positions that are symmetric with respect to the center line (center), like the cam portion 99. Further, θ1 in FIG. 16 corresponds to θ1 in FIGS. 18 to 19.

Next, the door opening operation (left door opening operation) of the left door 2a will be described with reference to FIG.
In the column “(a) Origin position” in FIG. 18, the detection switches 95 a and 95 b (notation in FIG. 18 are detection A and detection B), the switch lever tip portions 96 Ca and 96 Cb corresponding to each other are protruded from the cam portion 99. Part (first peripheral surface 99a (OFF surface)). That is, as described above, the detection switches 95a and 95b are on the convex portion (the first peripheral surface 99a (OFF surface)) of the cam portion 99, and indicate that both are in the OFF state (detection). A / B = OFF / OFF).

In the column of “(b) movement outside the origin” in FIG. 18, the cam portion 99 is rotated clockwise (CW direction) by the angle θ1 in correspondence with FIG. 17B to be outside the “origin range”. The shifted state is shown. In the column “(b) Outside the origin” in FIG. 18, the change in the detection switch 95 b (detection B) from OFF to ON is indicated as a change in position from a black circle to a white circle.
Since the detection switch 95b (detection B) has changed from OFF to ON, it can be confirmed that the large gear 76 is rotating out of the “origin range” and rotating clockwise (detection A / B = OFF / ON).

  In the column “(c) Intermittent gear meshing” in FIG. 18 and the column “(d) Projecting operation” in FIG. 18, as in the states shown in FIGS. 17 (c) and 17 (d), respectively. It shows that the cam portions 99 continue to rotate clockwise (CW direction) from the angles θ2 to θ3, respectively. That is, the intermittent drive gear 78a rotates in mesh with the large gear 76, and the protruding member 61a performs the protruding operation. The protruding member 61a opens the left door 2a, and the detection switches 95a and 95b maintain the OFF / ON state (detection A / B = OFF / ON).

  In the column “(e) Immediately before completion of protrusion” in FIG. 18, the large gear 76 is further rotated clockwise (CW direction) to an angle θ4 (> θ3) as in FIG. 17 (e). Shows the state just before completion. The detection switches 95a and 95b are turned ON / ON (detection A / B = ON / ON).

  In the column “(f) Projection completion / stop” in FIG. 18, as in FIG. 17 (f), the large gear 76 further rotates clockwise (CW direction) to an angle θ5 (> θ4) which is the maximum operating angle. It shows a stopped state. At this time, after a predetermined time (T1) has elapsed since the detection switches 95a and 95b are turned ON / ON, the motor 82 is stopped and the protruding operation is completed. The detection switches 95a and 95b are kept ON / ON (detection A / B = ON / ON). The maximum operating angle θ5 is set smaller than the rotation angle range θ6 of the large gear 76 set by the large gear stopper 76E and the mechanical stopper by the cover stopper 71 (θ5 <θ6).

Next, the opening operation of the right door 2b will be described with reference to FIG.
In the column of “(a) origin position” in FIG. 19, the detection switches 95a and 95b have switch lever tip portions 96Ca and 96Cb corresponding to the convex portion (first peripheral surface 99a (OFF surface)) range of the cam portion 99. It is in. That is, the switch levers 96a, 96b are pushed by the convex portion of the cam portion 99 and turned off by the cam portion 99 as described above. That is, as described above, the detection switches 95a and 95b are on the convex portion (the first peripheral surface 99a (OFF surface)) of the cam portion 99, and indicate that both are in the OFF state (detection). A / B = OFF / OFF).

In the column of “(b) movement outside the origin” in FIG. 19, the cam portion 99 rotates counterclockwise (CCW direction) by an angle θ1 symmetrically with respect to FIG. The state shifted to is shown. In the column “(b) Outside the origin” in FIG. 18, the change of the detection switch 95 a (detection A) from OFF to ON is indicated as a change in position from a black circle to a white circle.
As the detection switch 95a changes from OFF to ON, it can be confirmed that the large gear 76 is deviating from the “origin range” and rotating counterclockwise (CCW direction) (detection A / B = ON / OFF). ).

  In the column “(c) Intermittent gear meshing” in FIG. 19 and the column “(d) Projecting operation” in FIG. 19, the states shown in FIGS. 17 (c) and 17 (d) are symmetrical to each other. The cam portions 99 continue to rotate counterclockwise (CCW direction) from the angles θ2 to θ3, respectively. That is, the intermittent drive gear 78b meshes with the large gear 76 and rotates, and the protruding member 61b protrudes and performs an operation. The protruding member 61b opens the right door 2b, and the detection switches 95a and 95b are kept in the ON / OFF state (detection A / B = ON / OFF).

  In the column “(e) Immediately before completion of protrusion” in FIG. 19, the large gear 76 further rotates counterclockwise (CCW direction) to an angle θ4 (> θ3) symmetrically with the state shown in FIG. The state immediately before the protruding operation is completed is shown. The detection switches 95a and 95b are turned ON / ON (detection A / B = ON / ON).

The column “(f) Projection completion / stop” in FIG. 19 is symmetrical with the state shown in FIG. 17 (f), and the angle θ5 (the maximum operating angle of the large gear 76 is further counterclockwise (CCW direction). It shows a state in which it is turned to> θ4) and stopped. At this time, after a predetermined time (T2) has elapsed since the detection switches 95a and 95b are turned ON / ON, the motor 82 is stopped and the protruding operation is completed. The detection switches 95a and 95b are kept ON / ON (detection A / B = ON / ON).
The maximum operating angle θ5 is set smaller than the rotation angle range θ6 of the large gear 76 set by the large gear stopper 76E and the mechanical stopper by the cover stopper 71 (θ5 <θ6).

  Next, FIG. 20 collectively shows the relationship between the opening operation by the operation of the large gear 76 and the cam portion 99 described with reference to FIGS. 18 and 19 and the ON / OFF states of the detection switches 95a and 95b. FIG. 20 is a diagram for explaining the ON / OFF state of the detection switch during the left door opening operation and the right door opening operation of the door opening device.

  The column (1) in FIG. 20 shows the state of the column “(e) Immediately before completion of projection” and the column “(f) Projection completion stop” in FIG. 18 in the opening operation of the left door 2a. The same state is shown, and the detection switches 95a and 95b (detection A / B) are ON / ON.

  The column (2) in FIG. 20 includes the column “(b) Moving outside the origin” in FIG. 18, the column “(c) Intermittent gear meshing” in FIG. 18, and “(d) During projection operation” in FIG. The detection switches 95a, 95b (detection A / B) are OFF / ON.

The column (3) in FIG. 20 shows the same state as the state shown in the column “(a) Origin position” in FIG. 18 and the column “(a) Origin position” in FIG. , 95b (detection A / B) is OFF / OFF.
Here, if the detection switches 95a and 95b are OFF / OFF, the large gear 76 and the cam portion 99 are within the range of the angle ± θ1, and the large gear 76 meshes with either the left or right intermittent drive gears 78a and 78b. Therefore, it can be confirmed that both the left and right protruding members 61a and 61b are in the retracted positions. Therefore, if both the detection switches 95a and 95b are OFF / OFF, it can be confirmed that the door opening device 60 is in the “origin range”.

  The column (4) in FIG. 20 includes the column “(b) Moving outside the origin” in FIG. 19, the column “(c) Intermittent gear meshing” in FIG. 19, and “(d) Projecting operation” in FIG. The detection switches 95a and 95b (detection A / B) are ON / OFF.

The column (5) in FIG. 20 shows a state similar to the state shown in the column “(e) Immediately before completion of protrusion” in FIG. 19, and the detection switches 95a and 95b (detection A / B) are ON / ON. It has become.
Incidentally, as shown in the column (1) of FIG. 20 and the column (5) of FIG. 20, if the detection switches 95a and 95b (detection A / B) are ON / ON, the door opening by the door opening device 60 is performed. It can be confirmed that the operation is completed and either the protruding member 61a or the protruding member 61b is in the maximum protruding state.

Next, the operation when the door opening device 60 in the present embodiment opens the left door 2a will be described.
In the door opening device 60 at the “origin position” (see FIG. 17A), as shown in FIG. 8, the large gear 76 does not mesh with any of the intermittent drive gears 78a and 78b, and the left and right protruding members 61a. , 61b has not yet protruded. The detection switches 95a and 95b (detection A / B) are OFF / OFF (see FIG. 18A).

21 to 25 are plan views for explaining the protruding operation of the left protruding member.
As shown in FIG. 21, the motor 82 is further driven in the forward rotation direction from the state of the “origin position” (θ = 0) (see FIG. 17A), and the large gear 76 and the cam portion 99 are When it is rotated clockwise from the “origin position” at an angle θ1 (see FIG. 17B), the notch portion 76Da of the large gear 76 is in a state of being close to the stopper portion 80a of the intermittent drive gear 78a. In this state, the large gear 76 is not yet engaged with any of the intermittent drive gears 78a and 78b (see FIG. 17A), and the left and right protruding members 61a and 61b have not yet protruded.

  The detection switch 95a remains OFF (see FIG. 18B), and the switch lever tip 96Cb moves from the first peripheral surface 99a (OFF surface) of the cam portion 99 to the second peripheral surface 99b (ON surface). Then (see FIG. 17C), the detection switch 95b is switched from OFF to ON (see FIG. 18B).

As shown in FIG. 22, the motor 82 is further driven in the forward direction from the above state (see FIG. 21), and the large gear 76 and the cam portion 99 are rotated clockwise from the “origin position” (θ = 0). When rotating to θ2 (see FIG. 17C), the intermittent drive gear 78a meshes with the large gear 76 and starts to rotate counterclockwise. The rotating plate 73a integrated with the intermittent drive gear 78a also rotates counterclockwise. As a result, the connecting plate 65a meshing with the rotating plate 73a is pushed forward. The protruding member 61a connected to the connecting plate 65a starts to protrude forward. Thereby, the door opening operation of the left door 2a is started.
The detection switch 95a is OFF and the detection switch 95b is ON (see FIG. 18C).

As shown in FIG. 23, the motor 82 is further driven in the forward rotation direction from the above state (see FIG. 22), and the large gear 76 and the cam portion 99 are rotated clockwise from the “origin position” (θ = 0). When rotated to θ3 (see FIG. 17D), the intermittent drive gear 78a and the rotating plate 73a further rotate counterclockwise. The rotating plate 73a integrated with the intermittent drive gear 78a also rotates counterclockwise. As a result, the connecting plate 65a is pushed further forward, and the protruding member 61a continues to protrude forward.
The detection switch 95a is OFF and the detection switch 95b is ON (see FIG. 18D).

  As shown in FIG. 24, the motor 82 is further driven in the forward rotation direction from the above state (see FIG. 23), and the large gear 76 and the cam portion 99 are rotated clockwise from the “origin position” (θ = 0). It rotates so that it may become (theta) 4 (refer FIG.17 (e)), and the intermittent drive gear 78a and the rotating plate 73a further rotate counterclockwise. As a result, the connecting plate 65a is further pushed forward, and the protruding member 61a reaches immediately before the preset protruding completion position.

  The switch lever tip 96Ca of the switch lever 96a moves from the first peripheral surface 99a (OFF surface) to the second peripheral surface 99b (ON surface), and the detection switch 95a is switched from OFF to ON. That is, both the detection switches 95a and 95b (detection A / B) are turned on (see FIG. 18 (e)).

As shown in FIG. 25, when the motor 82 is further driven in the forward rotation direction from the above state (see FIG. 24) until the predetermined time T1 has elapsed since the detection switch 95a was turned on, the large gear 76 and the cam 99 are Rotate clockwise from the “position” (θ = 0) to an angle θ5 (see FIG. 17F). The intermittent drive gear 78a and the rotating plate 73a rotate counterclockwise. As a result, the left protruding member 61a further protrudes from the above state (see FIG. 24) and reaches the maximum protruding amount H2.
The outputs of the detection switches 95a and 95b are both ON (see FIG. 18 (f)).

  By the way, if the detection position by the detection switch 95a is set to the last minute, an error occurs in the mechanically operated device, so that it becomes difficult to set the detection position to the last. Therefore, by setting the delay timer (delay time (T1)) by detecting a short distance with the detection switch 95a, the protruding amount of the protruding member 61a is increased (longer), that is, the protruding member 61a is protruded to the maximum. It becomes possible. Moreover, since the detection by the detection switch 95a is detected a little before, detection mistakes can be prevented.

When the door opening device 60 performs the door opening operation of the left door 2a by the series of operations shown in FIGS. 21 to 25, the detection switches 95a and 95b are set to “detection A / B” in FIG. = OFF / OFF "," Detection A / B = OFF / ON "in (2) of FIG. 20, and" Detection A / B = ON / ON "in (1) of FIG.
The door opening device 60 ends the door opening operation of the left door 2a through a series of steps from FIG. 21 to FIG.

  Then, the door opening device 60 rotates (reverses) the motor 82 in the reverse rotation direction, and reverses the door opening operation process, through the states of FIGS. A process of returning to the origin position is performed. During this return operation, the detection switches 95a and 95b (detection A / B) indicate the completion of the protruding operation of the protruding member 61a, and the protruding state of the protruding member 61a from the detection A / B = ON / ON state. After the state of detection A / B = OFF / ON indicating the state, the state of detection A / B indicating “origin position” = OFF / OFF is obtained. That is, the door opening device 60 sets the detection switches 95a and 95b to “detection A / B = ON / ON” in (1) of FIG. 20 and “detection A / B = OFF / ON” in (2) of FIG. , Switching in the order of “detection A / B = OFF / OFF” in (3) of FIG.

Next, an operation when the door opening device 60 in the present embodiment opens the right door 2b will be described.
26 to 30 are plan views for explaining the protruding operation of the right protruding member.
As shown in FIG. 26, the motor 82 is further driven in the reverse direction from the state of the “origin position” (θ = 0) (see FIG. 17A), and the large gear 76 and the cam portion 99 are moved to the “origin”. When rotated counterclockwise at an angle θ1 (same as θ1 in FIG. 17B), the notch 76Db of the large gear 76 comes close to the stopper 80b of the intermittent drive gear 78b. In this state, the large gear 76 is not yet engaged with any of the intermittent drive gears 78a and 78b, and the left and right protruding members 61a and 61b have not yet protruded.

  The detection switch 95b remains OFF (see FIG. 19B), and the switch lever tip 96Ca moves from the first peripheral surface 99a (OFF surface) of the cam portion 99 to the second peripheral surface 99b (ON surface). Then, the detection switch 95a is switched from OFF to ON (see FIG. 19B).

As shown in FIG. 27, the motor 82 is further driven in the reverse direction from the above state (see FIG. 26), and the large gear 76 and the cam portion 99 are angled counterclockwise from the “origin position” (θ = 0). When rotating to θ2 (same as θ2 in FIG. 17C), the intermittent drive gear 78b meshes with the large gear 76 and starts to rotate clockwise. The rotating plate 73b integrated with the intermittent drive gear 78a also rotates clockwise. As a result, the connecting plate 65b meshing with the rotating plate 73b is pushed forward. The protruding member 61b connected to the connecting plate 65b starts to protrude forward. Thereby, the opening operation of the right door 2b is started.
The detection switch 95a is ON, and the detection switch 95b is OFF (see FIG. 19C).

As shown in FIG. 28, the motor 82 is further driven in the reverse direction from the above state (see FIG. 27), and the large gear 76 and the cam portion 99 are rotated counterclockwise from the “origin position” (θ = 0). When rotating to θ3 (same as θ3 in FIG. 17D), the intermittent drive gear 78b and the rotating plate 73b further rotate clockwise. The rotating plate 73b integrated with the intermittent drive gear 78b also rotates clockwise. As a result, the connecting plate 65b is pushed further forward, and the projecting member 61b continues to project forward.
The detection switch 95a is ON, and the detection switch 95b is OFF (see FIG. 19D).

  As shown in FIG. 29, the motor 82 is further driven in the reverse direction from the above state (see FIG. 28), and the large gear 76 and the cam portion 99 are angled counterclockwise from the “origin position” (θ = 0). The intermittent drive gear 78b and the rotating plate 73b are further rotated clockwise so as to be θ4 (same as θ4 in FIG. 17E). As a result, the connecting plate 65b is pushed further forward, and the protruding member 61b reaches immediately before the preset completion position.

  The switch lever tip 96Cb of the switch lever 96b moves from the first peripheral surface 99a (OFF surface) to the second peripheral surface 99b (ON surface), and the detection switch 95b is switched from OFF to ON. That is, the detection switches 95a and 95b (detection A / B) are both turned on (see FIG. 19 (e)).

As shown in FIG. 30, when the motor 82 is further driven in the normal rotation direction from the above state (see FIG. 29) until a predetermined time (T2) elapses after the detection switch 95a is turned on, the large gear 76 and the cam portion 99 are It rotates counterclockwise from the “origin position” (θ = 0) to an angle θ5 (same as θ5 in FIG. 17F). The intermittent drive gear 78b and the rotating plate 73b rotate in the clockwise direction. As a result, the right protruding member 61b further protrudes from the above state (see FIG. 29) and reaches the maximum protruding amount H2.
The outputs of the detection switches 95a and 95b are both ON (see FIG. 19 (f)).

  Similar to the operation of the protruding member 61a described above, by providing a delay timer (delay time (T1)) by detecting the front slightly with the detection switch 95b, the protruding amount of the protruding member 61b is increased (longer), That is, the protruding member 61b can be protruded to the maximum extent. Moreover, since the detection by the detection switch 95b is detected a little before, detection mistakes can be prevented.

When the door opening device 60 performs the door opening operation of the right door 2b by a series of operations shown in FIGS. 26 to 30, the detection switches 95a and 95b are set to “detection A / B” in FIG. = OFF / OFF "," detection A / B = ON / OFF "in (4) of FIG. 20, and" detection A / B = ON / ON "in (5) of FIG.
The door opening device 60 ends the door opening operation of the right door 2b through a series of steps from FIG. 26 to FIG.

  Then, the door opening device 60 rotates (reverses) the motor 82 in the forward rotation direction, and reverses the door opening operation process, through the states of FIGS. The process of returning to the origin position is performed. During this return operation, the detection switches 95a and 95b (detection A / B) indicate the completion of the protruding operation of the protruding member 61b, and the protruding state of the protruding member 61b from the detection A / B = ON / ON state. After the detection A / B = ON / OFF indicating the state, the detection A / B indicating the “origin position” = OFF / OFF. That is, the door opening device 60 sets the detection switches 95a and 95b to “detection A / B = ON / ON” in (5) of FIG. 20 and “detection A / B = ON / OFF” in (4) of FIG. , Switching in the order of “detection A / B = OFF / OFF” in (3) of FIG.

Next, after the door opening device 60 of the present embodiment opens the left door 2a, the door opening operation that opens the right door 2b subsequently will be described.
(A)-(e) of FIG. 31 is explanatory drawing of the door opening operation | movement of the doors on either side by the door opening apparatus of this embodiment.

  As shown in FIG. 31 (a), the door opening device 60 is in the origin position, the protruding members 61a and 61b are retracted, and the left and right doors 2a and 2b are closed.

As described above, when the user operates the left door opening switch 48a (see FIG. 2), the motor 82 (see FIG. 8) of the door opening device 60 rotates in the forward rotation direction.
As a result, as shown in FIG. 31B, the protruding member 61a corresponding to the left door 2a protrudes the maximum protruding amount H2, and the door 2a rotates clockwise (CW direction), for example, up to 10 °. open. The door 2a has a clockwise (CW direction) angular velocity corresponding to the protruding speed of the protruding member 61a.

  As shown in FIG. 31 (c), the door 2a operates in the opening direction by the pushing force (inertial force) when pushed by the protruding member 61a. The pushing force at this time is set to a force with which the first inclined surface 39d on the movable side (door 2a side) of the closer 37 can get over the first inclined surface 38c on the fixed side (thermal insulation box 10 side). (See FIG. 6 (a) → (b) → (c)). At this time, since there is a friction torque between the hinge 17a and the door 2a, the door 2a opens while decelerating. Further, between the closer 37 and the door 2a, the friction torque (see FIG. 6 (a)) when the first inclined surface 39d gets over the first inclined surface 38c, and the second inclined surface 39e changes the second inclined surface 38d. Since a friction torque (see FIG. 6C) is generated when sliding down, the door 2a opens while decelerating. Thus, the door 2a rotates while receiving the friction torque of the hinge 17a and the closer 37 with respect to the pushing force in the opening direction, and opens to a position where the opening angle becomes 90 °. On the other hand, after the protruding member 61a protrudes by the maximum protruding amount H2, the motor 82 of the door opening device 60 rotates in the reverse direction, and the protruding member 61a is drawn.

  Next, as shown in FIG. 31 (d), when the user operates the right door switch 48b (see FIG. 2) with the door 2a opened 90 °, the motor 82 rotates in the reverse direction as described above. Rotate to. As a result, when the protruding member 61b protrudes, the right door 2b rotates counterclockwise (CCW direction) and opens. The door 2b has a counterclockwise (CCW direction) angular velocity corresponding to the protruding speed of the protruding member 61b.

  As shown in FIG. 31 (e), the door 2b operates in the opening direction by the pushing force when pushed out by the protruding member 61b. At this time, since there is a friction torque between the hinge 17b and the closer 37 and the door 2b, the door 2b opens while decelerating. On the other hand, after the projecting member 61b projects the maximum projecting amount H2, the motor 82 of the door opening device 60 rotates in the forward rotation direction, and the projecting member 61b is drawn.

  As described above, the door opening device 60 according to the present embodiment can open the door 2a by operating the left door switch 48a and open the door 2b by operating the right door switch 48b. Can do.

Next, the characteristics of the door opening force when opening the doors 2a and 2b will be described.
FIG. 32 is a graph showing the relationship between the opening angle of the door and the opening force when the closed door is opened.
As shown in FIG. 32, the horizontal axis of the graph is the opening angle (opening angle) of the doors 2a and 2b, θd = 0 is the state in which the doors 2a and 2b are closed (closed state), and θdmax is the maximum opening angle. It is. This θdmax (maximum opening angle) represents an opening angle (for example, 90 °) when abutting against a wall surface (not shown) close to the place where the refrigerator 1 is installed. θ1 is an angle when the doors 2a and 2b are pushed out by the protruding members 61a and 61b of the door opening device 60 to the maximum protruding amount H2 (see FIG. 4). θ2 is an angle ψ1 (see FIG. 6B) that causes the closer 37 (see FIG. 5A) to generate a closing force (rotational torque in the closing direction to be in the closed state) on the doors 2a and 2b. That is, the opening angle of the doors 2a and 2b when being pushed open by the door opening device 60 is set to be smaller than the angle ψ1, which is the upper limit for applying a closing force to the doors 2a and 2b.

  The vertical axis of the graph represents the opening force of the door (freezer compartment door) 2a and the door (refrigerator compartment door) 2b. As this door opening force, for example, torque around the hinges 17a and 17b (see FIG. 1) may be used, or the door end portion, the handle portion, etc. that are farthest from the hinges 17a and 17b (see FIG. 1) of the doors 2a and 2b. The pulling force at may be used.

  The door packing 15 (see FIG. 1) of the doors 2a and 2b incorporates a magnet (not shown), and is attracted to the front surface of the heat insulating box 10 (see FIG. 1) so that no gap is generated. As a result, in order to open the doors 2a and 2b, in addition to the load of the closer 37, a door opening force (packing load) is required for peeling the door packing 15 from the front surface of the heat insulating box 10 to which the magnet is adsorbed. The door opening force (packing load) for peeling off is large when the doors 2a and 2b start to open, and even if they are opened slightly, the magnet's attracting force (magnetic force) decreases rapidly, so the door opening force decreases rapidly. Become.

  Further, since the left door 2a is a door that opens and closes the freezer compartment 10g having a large opening, when the door 2a is opened and closed, moisture entering from outside freezes (gas becomes solid). Thereby, since the inside of the freezer compartment 10g becomes a negative pressure, it is difficult to open the door 2a when trying to open the door immediately after closing. Thus, when opening the door 2a, the door opening force (load by negative pressure) which considered the negative pressure is further added. That is, the door 2a on the left side has a larger opening force at the beginning of opening than the door 2b of the right refrigerator compartment.

Since the fulcrum friction load is a friction torque generated mainly by the frictional resistance of the hinges 17a and 17b, the fulcrum friction load is generated almost uniformly in the entire range of the opening angle.
Therefore, the door opening force of the doors 2a and 2b is maximum at θd = 0 at the beginning of opening, and decreases sharply to θ1 that is the protruding range (acceleration range) of the protruding members 61a and 61b, and the maximum opening angle A substantially uniform friction torque is generated up to θdmax.

  Next, suitable opening characteristics (angular velocity characteristics, angular displacement characteristics) when the doors 2a and 2b are opened by the door opening device 60 will be described.

  As described above, when the protruding member 61a or the protruding member 61b is operated by the user's operation of the left opening switch 48a or the right opening switch 48b, the doors 2a and 2b are opened toward the user. At this time, it is desirable to open the doors 2a and 2b so that the movements of the doors 2a and 2b have no sense of incongruity and a natural impression is felt.

  Needless to say, the doors 2a and 2b are in a stopped state at a speed = 0, and in order to perform a door opening operation from the stopped state, an acceleration motion in which the speed is accelerated from 0 is performed. Since the doors 2a and 2b are revolving doors, the movement is an angular acceleration movement. However, in order to make the explanation easy to understand, the doors 2a and 2b simply perform an acceleration movement.

  As the door opening operation that gives a natural impression to the user, it is desirable that the doors 2a and 2b perform smooth and uniform acceleration while the protruding members 61a and 61b perform the protruding operation. Here, “perform uniform acceleration” means a uniform acceleration motion, and the velocity is linearly accelerated during the uniform acceleration motion.

Here, since the uniform acceleration motion is the most common motion of an object in the natural world, it can be felt as natural. For example, the motion of the object at the time of free fall is a constant acceleration motion, or the motion of an object that decelerates while sliding on a friction surface is a constant acceleration motion in a negative direction.
In this way, all the motions that accelerate and decelerate while the object receives a certain force are equal acceleration motions, so it is a natural motion because it is a motion that is seen daily. Therefore, the doors 2a and 2b are opened to give a natural impression by performing an opening operation similar to a uniform acceleration motion.

  The speed of an object that performs a uniform acceleration motion increases or decreases at a constant rate over time. Therefore, in the door opening device 60 of the present embodiment, the projecting operation of the projecting members 61a and 61b is performed at a low speed at the beginning of the projecting, and the speed is gradually increased so that the maximum speed can be obtained just before the projecting ends. Set to. Thereby, the protrusion members 61a and 61b perform the door opening operation | movement which can obtain the acceleration feeling of the doors 2a and 2b close | similar to a uniform acceleration motion, and implement | achieve the door opening apparatus 60 which can feel door opening operation | movement naturally.

  The movement of the projecting members 61a and 61b is a linear motion, and the doors 2a and 2b are rotational motions. Therefore, the direction and unit of motion are different, but as will be described in detail later, the speed of the projecting members 61a and 61b There is a proportional relationship with the angular velocity. When the protruding members 61a and 61b perform a behavior approximating a uniform acceleration motion, the doors 2a and 2b perform a behavior approximating a suitable uniform angular motion.

  FIG. 33A is a graph showing a relationship between a preferable door angular velocity and opening time when the door is opened. The horizontal axis indicates time, and the vertical axis indicates the angular velocity of the doors 2a and 2b. FIG. 33B is a graph showing the relationship between the opening angle of the door and the opening time. The horizontal axis indicates time, and the vertical axis indicates the opening angle of the doors 2a and 2b. 33 (a) and 33 (b), the solid line indicates the case where the doors 2a and 2b are stopped at the opening angle of 90 °, and the broken line indicates that the doors 2a and 2b exceed the opening angle of 90 °. Shows the case of opening.

  As shown by a solid line in FIG. 33A, the doors 2a and 2b are closed at time t = 0. After a time delay from t = 0 to t = 1, when the opening device 60 is operated by energizing the door opening device 60 at t = t1, the projecting members 61a, 61b protrudes in the door 2a, 2b direction. From t = t1 to t2, it is an acceleration range that opens while accelerating the doors 2a and 2b. That is, the operation of the door 2a in FIGS. 31 (a) to 31 (b) or the operation of the door 2b in FIGS. 31 (c) to 31 (d) is an operation in this acceleration range.

In this acceleration range, the angular velocity increases uniformly with time, so the graph becomes a straight line rising to the right, and the maximum angular velocity ωdmax at t = t2.
During the period from t = t2 to t = t3, the doors 2a and 2b are not accelerated by the protruding members 61a and 61b. From t = t2 to t = t3, the doors 2a and 2b are in a deceleration range that opens while decelerating.

  That is, the operation of the door 2a in FIGS. 31 (b) to 31 (c) or the operation of the door 2b in FIGS. 31 (d) to 31 (e) is an operation in the deceleration range. During the deceleration range, the doors 2a and 2b receive frictional resistance (fulcrum friction load) from the hinges 17a and 17b, so that the doors 2a and 2b continue to open with inertia (inertial force) and gradually decelerate. Further, since the doors 2a and 2b receive frictional resistance (closer load) by the closer 37 during the deceleration range, the doors 2a and 2b continue to open with inertia (inertial force) and gradually decelerate.

The frictional resistance is a constant force generally obtained by multiplying the mass and the coefficient of friction. In the case of a rotary hinge as in this embodiment, the frictional resistance depends on the diameter of the portion that supports the mass of the doors 2a and 2b. Friction torque is generated.
While the doors 2a and 2b open by inertia, the vehicle is decelerated by a constant friction torque, so that the angular velocity between the deceleration ranges decreases uniformly with time, and the graph becomes a straight line that goes to the right. Until the doors 2a and 2b stop at t = t3, a constant acceleration motion in the negative direction is performed from t = t2 to t = t3.

  As shown in the graph of angular displacement shown by the solid line in FIG. 33 (b), in the acceleration range from time t = t1 to t2, the opening angle θd of the doors 2a and 2b is a quadratic curve that protrudes downward. To increase. In the deceleration range from time t2 to time t3, the opening angle θd of the doors 2a and 2b increases in a quadratic curve that is convex upward. The opening angle θd of the doors 2a and 2b is the maximum opening angle θdmax at t = t3. The downwardly convex quadratic curve and the upwardly convex quadratic curve are continuous. Here, if θdmax is set to an angle of 90 ° or more, the doors 2a and 2b are sufficiently opened for taking in and out food, which is easy to use and suitable.

  On the other hand, as shown by the broken line in FIG. 33A, in the deceleration range from time t = 2 to t = t3, the opening operation of the doors 2a and 2b does not stop at t = t3, and the angular velocity ωd90 (≠ 0). When it becomes, it becomes the operation of the return range. That is, during the return range, the first inclined surface 39d goes up the third inclined surface 38e, and the third inclined surface 39f goes up the first inclined surface 38c (see FIG. 6E), the angular velocity ωd The inclination slightly changes, and the angular velocity ωd becomes 0 (zero) from t = t3 to t = t4. Then, the first inclined surface 39d slides down in the closing direction of the third inclined surface 38e, and the third inclined surface 39f slides down in the closing direction of the first inclined surface 38c (see FIG. 6E), t = T4 to t = t5, the angular velocity ωd becomes negative, and becomes 0 (zero) at t = t5.

  Also, as shown in the graph of angular displacement with a broken line in FIG. 33B, the opening operation of the doors 2a and 2b does not stop at the opening angle θdmax (for example, 90 °) in the deceleration range from time t2 to t3, Even if the opening is once excessive, by providing the third inclined surfaces 38e and 39f, after reaching the maximum opening angle at t = t4, it rotates in the closing direction and returns to θdmax at t = t5.

Next, a preferable opening operation time when the doors 2a and 2b are opened by the door opening device 60 will be described.
In general, it is said that the reflex time of an adult is 0.2 to 0.3 seconds, which is known as the time from when an object starts to fall until it is grasped with a finger. Yes.

  The phenomenon shorter than the reflection time is too fast and feels abrupt and uncomfortable. Therefore, when opening the doors 2a and 2b using the door opening device 60, the left door switch 48a or the right door is opened. If the operation time t2 from when the switch 48b is operated until the door 2a or the door 2b starts to open until reaching the maximum speed or the maximum angular speed ωdmax is set to 0.3 seconds or more, the doors 2a and 2b are opened. I do not feel the movement suddenly and feel it is natural.

  When the left door switch 48a and the right door switch 48b are operated, they may be when they are pressed with fingers, or may be when the fingers are released from them. However, when the doors 2a and 2b begin to open before the fingers are released from these, the fingers are pushed by the doors 2a and 2b that open, giving a sudden impression. Therefore, it is desirable that the doors 2a and 2b start to open after the fingers are released from the left door switch 48a or the right door switch 48b.

  In order to set the time t2 to 0.3 seconds or more, for example, after the user operates the left door switch 48a or the right door switch 48b, the time t2 becomes a time t1 with a time delay of about 0.1 seconds. It is desirable to start opening. After t1, the motor 82 is energized to start the opening operation, and the protrusion operation time T = (t2-t1) until reaching the maximum speed or the maximum angular speed ωdmax is set to 0.2 seconds or more. It is desirable to do.

On the other hand, if the operation time t2 is excessive, the door opening operation is felt to be unnaturally slow, so that the operation time t2 is 0.7 seconds or less, which is slightly slower than the reflection time of the person at the maximum. It is desirable to set. By setting in this way, the door opening device 60 can perform an appropriate door opening operation without the door opening operation being too fast and too sudden, and without being too late.
That is, when the motor 82 is energized, the projecting members 61a and 61b start projecting, the doors 2a and 2b begin to open, and the projecting operation time T from reaching the maximum speed or the maximum angular speed ωdmax is 0.2 seconds. As mentioned above, it is suitable to set it as 0.6 second or less.

  As described above, in order to realize a natural door opening operation, it is desirable to approximate the opening characteristics of the doors 2a and 2b to equal acceleration or equal angular acceleration motion. Further, it is desirable that the protrusion operation time T from when the doors 2a, 2b start to open until reaching the maximum speed or the maximum angular speed is set to 0.2 seconds or more and 0.6 seconds or less. Further, the door opening device 60 does not perform special speed control on the motor 82, for example, by rotating the motor 82 at a constant rated rotational speed, thereby causing the protruding members 61 a and 61 b to perform an operation approximating a uniform acceleration motion. It is desirable to have a configuration that allows

<Projection member operation>
Next, an operation in which the connecting plates 65a and 65b and the projecting members 61a and 61b move and the doors 2a and 2b open by the rotating operation of the rotating plates 73a and 73b will be described. In the following, only the operation of opening the door 2a will be described, and the description of the door 2b that operates in the same manner as the door 2a will be omitted.

  (A)-(f) of FIG. 34 is operation | movement explanatory drawing of the rotation board and connection board in a door opening apparatus. 34 (a) to (f), the symbols ra, rc, rf, rj, rn, and rq denote the teeth 101A to 101P provided on the connecting plate 65a and the teeth 102a provided on the rotating plate 73a. ~ Represents the meshing pitch circle radius with the tooth 102q.

  As shown in FIG. 34A, the rotating plate 73a is at the origin position. As described above, the left opening switch 48a (see FIG. 2) is operated by the user, and the rotating plate 73a starts to rotate counterclockwise.

  As shown in FIG. 34 (b), the teeth 101C of the connecting plate 65a mesh between the teeth 102c and 102d of the rotating plate 73a, and the connecting plate 65a moves in the direction of the arrow. Thereby, the protruding member 61a starts to perform a protruding operation. That is, the door 2a starts to open.

  As shown in FIG. 34C, the rotating plate 73a further rotates, and the teeth 101F of the connecting plate 65a mesh between the teeth 102f and 102g of the rotating plate 73a, so that the connecting plate 65a further moves in the direction of the arrow.

  As shown in FIG. 34 (d), the rotating plate 73a further rotates, and the teeth 101J of the connecting plate 65a mesh between the teeth 102j and 102k of the rotating plate 73a, and the connecting plate 65a further moves in the direction of the arrow.

  As shown in FIG. 34 (e), the rotating plate 73a further rotates, the teeth 101N of the connecting plate 65a mesh between the teeth 102n and 102p of the rotating plate 73a, and the connecting plate 65a further moves in the direction of the arrow.

As shown in FIG. 34 (f), the rotating plate 73a further rotates, and the teeth 102q at the outermost periphery of the rotating plate 73a press the teeth 101P at the rear end of the connecting plate 65a forward. The connecting plate 65a further moves in the direction of the arrow to project the projecting member 61a so that the maximum projecting amount H2 is obtained. The protruding speed of the protruding member 61a is the maximum speed, and stops immediately thereafter.
Then, as described above, the rotating plate 73a rotates in the reverse direction (clockwise), and reaches the origin position shown in FIG. 34 (a) through the state of FIG. 34 (f) to FIG. 34 (b). Return.

Next, the speed characteristics of the connecting plate 65a, the protruding member 61a, and the doors 2a and 2b will be described.
As described above, the teeth 101A to 101P and the teeth 102a to 102q provided on each of the connecting plate 65a and the rotating plate 73a start to mesh with the teeth 101A and the teeth 102a having the smallest radius ra. Until the radius finally reaches the maximum rq, the radius gradually increases and meshes. At this time, the rotating operation of the rotating plate 73a is converted into a linear operation of the connecting plate 65a and the protruding member 61a.

  When the motor 82 rotates at a constant rated rotational speed and the rotating plate 73a rotates at an appropriate rotational speed reduced by the reduction gear train 83, the moving speed of the connecting plate 65a and the protruding member 61a starts to move. Is slow. After that, the moving speed of the connecting plate 65a and the protruding member 61a has an acceleration characteristic that gradually accelerates and finally reaches the maximum speed. The degree of this acceleration is represented by the ratio between the maximum radius rq and the minimum radius ra of the rotating plate 73a, that is, rq / ra.

Next, the protruding speed characteristic and the protruding output characteristic of the protruding member 61a will be described.
FIG. 35A is a graph showing the relationship between speed and time when the protruding member protrudes. The horizontal axis is time, and the vertical axis is the protruding speed of the protruding member. FIG. 35B is a graph showing the relationship between force and time when the protruding member protrudes. The horizontal axis is time, and the vertical axis is the projecting output of the projecting member. In FIGS. 35A and 35B, t = 0 indicates the state of FIG. 34A, which is the time when the protruding member 61a starts to operate. T is a time [T = (t2−t1)] until the protruding member 61a reaches the maximum velocity or the maximum angular velocity ωdmax (where t1 is the time until the state shown in FIG. 34A). Yes, t2 is the time until it becomes FIG. 34 (f)).

When the rotational speed of the rotating plate 73a is N (rpm), the angular velocity ω (rad / s) of the rotating plate is ω = (N / 60) × 2π (Equation 1)
It is represented by
The speed of the protruding member 61a at this time is a tangential speed of the pitch circle radius of the teeth 102a to 102q of the rotating plate 73a meshing with the teeth 101A to 101P of the connecting plate 65a.
Therefore, the speed Va of the protruding member 61a at t1 shown in FIG. 35A (time until the state shown in FIG. 34A) is the tangential speed of the pitch circle radius ra, so Va = ω × ra = (N / 60) × 2π × ra (Expression 2)
It becomes. This Va is very low speed, and is accelerated from the stop state at zero speed.

Further, the speed Vq of the protruding member 61a at t2 shown in FIG. 35 (a) (time until the state shown in FIG. 34 (f)) is the tangential speed of the portion of the pitch circle radius rq.
Vq = ω × rq = (N / 60) × 2π × rq (Equation 3)
It becomes.

As is apparent from Equations 2 and 3, the protruding speed of the protruding member 61a is proportional to the pitch circle radius of the teeth meshing between the rotating plate 73a and the connecting plate 65a.
Further, as described above, since the pitch circle radii ra to rq have a relationship of ra <rb <rc <rd <re <rf <rg <rh <rj <rk <rm <rn <rp <rq, for example, rb If the pitch circle radius of adjacent teeth increases substantially uniformly like the ratio of / ra and the ratio of rc / rb, the protruding speed of the protruding member 61a increases in proportion to the angular speed of the rotating plate 73a. To do.

Therefore, according to this door opening device 60, the motor 82 is rotated at a constant rated rotational speed, for example, without performing special speed control on the motor 82, thereby approximating the projecting members 61a and 61b to a uniform acceleration motion. The action can be performed.
In the door opening device 60, when t = t2 as described above, the rotating plate 73a is temporarily stopped by stopping the motor 82, and then the protruding member 61a is returned to the origin by the reverse rotation of the motor 82. .

The projecting output of the projecting member 61a is inversely proportional to the pitch circle radius of the teeth meshing between the rotating plate 73a and the connecting plate 65a.
That is, as shown in FIG. 35B, the projecting force Pa of the projecting member 61a has the maximum projecting force Pa at t = t1. Further, the projecting output of the projecting member 61a decreases as the pitch circle radius of the rotating plate 73a meshing with the connecting plate 65a increases from ra to rq. The projecting output of the projecting member 61a has a uniform decreasing tendency so as to become the minimum value Pq at t = t2.

By the way, in this embodiment, when the door 2a is pushed open by the opening device 60 at an opening angle of θdmax (for example, 10 °), the first inclined surface 39d is positioned in front of the apex 38s (FIG. 6). (A)). For this reason, the speed Vq and the thrust output Pa set here are the friction generated when the first inclined surface 39d can get over the apex 38s and the second inclined surface 39e slides down on the second inclined surface 38d. It is preferable that the speed is set so that the door 2a stops at a state where the door 2a is opened while the force is received, and the output is a sudden output. By setting in this way, it is possible to secure a wide angle range for generating a closing force (rotational torque in the closing direction to be in a closed state) for preventing the half door.
In the above description, the operation of the left protruding member 61a has been described. However, the right protruding member 61b operates in the same manner as the left protruding member 61a except that the left protruding member 61b is symmetrical.

Next, the relationship between the projecting speed of the projecting members 61a and 61b during the opening operation and the speed at the end of the door farthest from the hinges 17a and 17b of the doors 2a and 2b will be described.
FIG. 36A is an explanatory view showing the relationship between the speed of the protruding member and the speed of the end of the freezer compartment door when the left protruding member is protruded, and FIG. 36B is the right protruding member. It is explanatory drawing which shows the relationship between the speed of the protrusion member at the time of protruding, and the speed of the edge part of a refrigerator compartment door.

As shown in FIG. 36 (a), the protruding speed of the protruding member 61a is V (mm / sec), the distance from the hinge 17a to the protruding member 61a is Rda (mm), and the door end that is farthest from the hinge 17a When the distance is Lda (mm), the tangential speed at the end of the door farthest from the hinge 17a is Wa (mm / sec), and the angular velocity of the door 2a is ωda (rad / sec), the following equation (4) is obtained. To establish.
ωda = V / (2 × π × Rda) = Wa / (2 × π × Lda) (Equation 4)

The relationship between the tangential speed Wa at the door end furthest from the hinge 17a and the protruding speed V of the protruding member 61a is:
Wa = (Lda / Rda) × V (Equation 5)
It becomes.
That is, the tangential speed Wa is proportional to the ratio (Lda / Rda) between the width of the door 2a and the mounting position of the protruding member 61a when the hinge 17a is used as the reference position.
Therefore, if the protruding member 61a performs a motion approximating the uniform acceleration motion, the door end portion of the door 2a also performs a motion approximating the uniform acceleration motion, so that a natural opening can be obtained.

The maximum value Waq of the tangential speed Wa is a case where V = Vq where the protrusion speed V takes the maximum value.
Waq = (Lda / Rda) × Vq (Expression 6)
It is represented by

Next, the relationship between the protruding speed of the protruding member 61a during the opening operation of the door 2b and the speed at the door end portion farthest from the hinge 17b of the door 2b will be described.
As shown in FIG. 36 (b), the protruding speed of the protruding member 61b is V (mm / sec), the distance from the hinge 17b to the protruding member 61b is Rdb (mm), and the distance from the hinge 17b to the door end that is furthest away is shown. Assuming that the distance is Ldb (mm), the tangential speed at the end of the door farthest from the hinge 17b is Wb (mm / sec), and the angular speed of the refrigerator compartment door 2b is ωdb (rad / sec), ) Holds.
ωdb = V / (2 × π × Rdb) = Wb / (2 × π × Ldb) (Expression 7)

The relationship between the tangential speed Wb at the door end farthest from the hinge 17b and the protruding speed V of the protruding member 61b is:
Wb = (Ldb / Rdb) × V (Equation 8)
It becomes.
That is, the tangential speed Wb is proportional to the ratio (Ldb / Rdb) between the width of the door 2b and the mounting position of the protruding member 61b when the hinge 17b is used as the reference position.
Therefore, if the protruding member 61b performs a motion approximating the uniform acceleration motion, the door end portion of the door 2b also performs a motion approximating the uniform acceleration motion, so that the door 2b can be naturally opened.

The maximum value Wbq of the tangential speed Wb is the case where V = Vq where the protruding speed V takes the maximum value.
Wbq = (Ldb / Rdb) × Vq (Equation 9)
It is represented by

According to the door opening device 60 of the present embodiment, when the motor 82 is rotated in the normal rotation direction at a constant rotational speed, the protruding member 61a performs a motion that approximates a uniform acceleration motion. On the other hand, when the motor 82 is rotated in the reverse rotation direction at a constant rotational speed, the protruding member 61b performs a motion that approximates a uniform acceleration motion.
Therefore, the door opening device 60 can perform a natural door opening operation by rotating the motor 82 at a constant speed in the normal rotation or reverse rotation direction without performing special speed control.
Therefore, according to the door opening device 60, the control circuit can be simplified. Moreover, according to the door opening device 60, a natural impression can be given to the door opening operation with an inexpensive configuration.

Next, a preferable arrangement of the door opening device 60, the door 2a, and the door 2b will be described.
Returning to FIG. 8 again, the door opening device 60 transmits the driving force when the motor 82 rotates in the forward rotation direction or the reverse rotation direction to the large gear 76 and the intermittent drive gears 78a and 78b, thereby opening the door 2a. , 2b corresponding to the protruding members 61a and 61b.

  The projecting operation of the projecting member 61a and the projecting operation of the projecting member 61b are the same in terms of driving force and speed, except for errors such as frictional resistance and differences in the characteristics of the motor 82 in the forward and reverse directions. That is, the projecting speed of the projecting member 61a and the projecting speed of the projecting member 61b are substantially equal, and the maximum values thereof can be both Vq (mm / sec) shown in FIG.

The projecting members 61a and 61b provided in the door opening device 60 are at positions facing the doors 2a and 2b, respectively, and can sequentially open both the doors 2a and 2b.
The protruding members 61a and 61b are disposed close to the left side surface and the right side surface of the case 62 of the door opening device 60, and the distance between them is G shown in FIG. 36, which is a constant value. The value of G can be set to about 150 mm to 180 mm, for example.

  Although not shown, the width Lda of the door 2a (see FIG. 36A) and the width Ldb of the door 2b (see FIG. 36B) are equal (Lda = Ldb), and the door 2a and the door 2b are symmetrical. In this case, the left and right centers of the door opening device 60 are aligned with the centers of the door boundaries 72a and 72b (see FIGS. 36 (a) and (b)) of the doors 2a and 2b and are arranged at symmetrical positions. . Accordingly, the distance Rda (see FIG. 36A) between the protruding member 61a and the hinge 17a in the door 2a and the distance Rdb (see FIG. 36B) between the protruding member 61b and the hinge 17b in the door 2b are Rda = Rdb. Such an arrangement of the door opening device 60 is desirable because there is no difference in how the doors 2a and 2b are opened.

Next, the suitable arrangement | positioning of the door opening apparatus 60 when the width | variety of the door 2a and the door 2b differs is demonstrated.
When performing the door opening operation of the doors 2a and 2b by the door opening device 60, the user stands in front of the refrigerator 1 and the door boundaries 72a and 72b of the doors 2a and 2b (see FIGS. 36A and 36B). The left door switch 48a or the right door switch 48b is operated by reaching out from the front.

  When viewed from the user, when the door opening device 60 operates to open the door 2a, the door end that is farthest from the hinge 17a of the door 2a approaches the user at a tangential speed Wa. Further, when the door 2b is opened, the door end that is farthest from the hinge 17b of the door 2b moves toward itself at the tangential speed Wb.

  Therefore, when the doors 2a and 2b are opened, if the maximum tangential speeds Waq and Wbq (see FIGS. 36A and 36B) of the doors 2a and 2b are substantially equal, the user opens the doors 2a and 2b. I feel the speed is almost equal. Therefore, even when the widths of the doors 2a and 2b are different, it is desirable to provide the door opening device 60 at a position where the maximum tangential velocity Waq = Wbq. Next, the arrangement position of the opening device 60 that satisfies such conditions will be described.

As shown in FIGS. 36A and 36B, the distance between the protruding member 61a and the protruding member 61b is G, the distance from the door boundary 72a to the protruding member 61a is Ga, and the door boundary 72b to the protruding member 61b. If the distance of Gb is Gb, the distance between the door boundaries 72a and 72b can be ignored as it is sufficiently smaller than the width of the doors 2a and 2b. That is, the following expression (10) is established.
G = Ga + Gb (Equation 10)

Further, as shown in FIGS. 36A and 36B, it is clear that the following expressions (11) and (12) are established.
Rda = Lda-Ga (formula 11)
Rdb = Ldb−Gb (Equation 12)

Further, from Equation 6, Waq = (Lda / Rda) × Vq = {Lda / (Lda−Ga)} × Vq (Equation 13)
From (Expression 9), Wbq = (Ldb / Rdb) × Vq = {Ldb / (Ldb−Gb)} × Vq (Expression 14)
Is guided.

And, the condition that the expression 13 and the expression 14 are equal is that the right sides of both expressions are equal,
{Lda / (Lda-Ga)} = (Ldb / (Ldb-Gb)} (Equation 15)
Then, by expanding the equation and substituting (Equation 10), Lda × {Ldb− (G−Ga)} = Ldb × (Lda−Ga)
Lda × (G−Ga) = Ldb × Ga
Lda × G = (Lda + Ldb) × Ga
Therefore, Ga = G × {Lda / (Lda + Ldb)} (Equation 16)
It becomes.

  Ga on the left side of Equation 16 is the distance from the door boundary 72a of the protruding member 61a that opens the door 2a. Therefore, if this Ga is a representative dimension when the opening device 60 is attached to the refrigerator 1, the right side of the equation 16 is the distance between the protruding member 61a and the protruding member 61b determined by the configuration of the opening device 60. It is a constant determined by G, the width Lda from the hinge 17a of the door 2a, and the width Ldb from the hinge 17b of the door 2b.

  In other words, by providing the refrigerator 1 with the door opening device 60 so that the protruding member 61a is arranged at the Ga position obtained by the above equation 16, when the protruding speeds of the protruding members 61a and 61b are equal, The maximum tangential velocities Waq and Wbq are equal. Thereby, the user can feel that the opening speeds of the doors 2a and 2b are substantially equal. Therefore, according to this door opening device 60, even when the doors 2a and 2b have different widths, the door opening operation is well balanced and a natural door opening operation can be realized.

  Here, the opening speeds of the doors 2a and 2b were evaluated using various refrigerators 1 with the widths Lda and Ldb (see FIGS. 36A and 36B) of the doors 2a and 2b ranging from a maximum of about 500 mm to a minimum of about 280 mm. . As a result, if the maximum tangential velocities Waq and Wbq are set to be approximately 700 to 1100 mm / sec, the user can open the doors 2a and 2b at an appropriate opening speed that is neither too fast nor too slow. It turns out that it feels as a movement.

  By the way, the door 2a shown to Fig.36 (a) is a freezer compartment door which opens and closes the freezer compartment 10g. Therefore, when the door 2a is opened, a load due to negative pressure (see FIG. 32) is added, so the door opening force is larger than when the door (refrigeration room door) 2b is opened. Therefore, the door 2a is hard to open compared with the case where the door 2b is opened. Therefore, as the mounting position of the door opening device 60, the door opening device 60 is moved to the door 2b side, in other words, the Rda dimension shown in FIG. It is desirable to do. As a result, the moment around the hinge 17a when the door 2a is opened can be increased, and the door 2a can be easily opened.

Next, the characteristics of the projecting output by the projecting member 61a will be described.
As described above, the opening force characteristics of the doors 2a and 2b (see FIG. 32) are large because the opening force for tearing off the door packing 15 attracted by the magnet is required at the beginning of the opening of the doors 2a and 2b. However, even if the doors 2a and 2b are opened even slightly, the magnetic attractive force of the magnet decreases rapidly, so the opening force decreases rapidly.

Therefore, it is desirable that the characteristic of the projecting force of the projecting member 61a is such that the projecting power at the start of the opening operation is maximized.
As shown in FIGS. 34A to 34F, the meshing of the teeth of the connecting plate 65a and the rotating plate 73a starts with the smallest pitch radius ra and reaches the largest pitch radius rq. Meanwhile, while the pitch radius gradually increases, the rotation operation of the rotating plate 73a is converted into a linear operation of the connecting plate 65a and the protruding member 61a.

  According to the door opening device 60 having such a configuration, as described above, the projecting output transmitted from the connecting plate 65a to the projecting member 61a is large at the beginning of movement, gradually decreased, and finally minimized. As described above, the reduction degree of the projecting output is represented by the ratio (ra / rq) between the minimum radius ra and the maximum radius rq of the rotating plate 73a.

  Further, according to the door opening device 60 having such a configuration, as described above, the opening operation time T is set to 0.2 seconds or more and 0.6 seconds or less, so that the opening operation does not feel suddenly. And it feels natural movement without being too slow.

  In the door opening device 60, as described above, the time from when the protruding member 61a completes the protruding operation until the door 2a reaches the maximum speed or the maximum angular speed is shown in FIG. It is equal to the protrusion operation time T during which the rotating plate 73a rotates to the position f).

  According to the door opening device 60, the speed reduction ratio from the motor 82 to the rotating plate 73a is appropriately set, and the protruding operation time T is set to 0.2 seconds or more and 0.6 seconds or less as described above. be able to. Therefore, the door opening device 60 can realize a door opening operation that feels natural and not suddenly by requiring an appropriate time for the door opening operation.

Next, the influence on the door opening characteristics due to the amount of food stored in the door pocket 13 will be described.
Since the door opening device 60 sets the reduction gear ratio so that the protrusion operation time T of the door opening operation is 0.2 seconds or more, no food is contained in the door pocket 13, Even in the case of the lightest weight of the doors 2a and 2b alone, the protrusion operation time T does not become 0.2 seconds or less.
Therefore, according to the door opening device 60, the doors 2a and 2b are not accelerated and opened suddenly in a short time of 0.2 seconds or less.

  In addition, if a large amount of food, for example, about 5 kg to 10 kg is stored in the door pocket 13, the inertial mass becomes larger than the case where only the dead weight of the doors 2a and 2b is used. However, according to this door opening device 60, the projecting output by the projecting member 61a is maximized at the beginning of the opening of the door 2a, so the projecting speed of the projecting member 61a is somewhat slow, but the effect of this speed reduction is used. It can be reduced to such an extent that a person cannot feel it clearly.

  Moreover, according to this door opening device 60, since the protrusion operation time T can be set to 0.2 second or more and 0.6 second or less, regardless of the amount of food stored in the door pocket 13 of the doors 2a and 2b. In addition, the opening operation is neither too slow nor too late. Therefore, according to the door opening device 60, the opening operation of the doors 2a and 2b is not suddenly felt, and a natural door opening operation can be realized. Moreover, according to the door opening device 60, when the protrusion operation time T is 0.2 seconds or more, the acceleration during the door opening operation is reduced, and an impact force is applied to the food stored in the door pocket 13. Nor.

  In addition, since the door opening device 60 is configured such that the protruding members 61a and 61b protrude from the origin position where the protruding members 61a and 61b do not protrude, the protruding members 61a and 61b are not retracted from the origin position. Absent. That is, since the space for the protrusion members 61a and 61b to retreat is not required in the door opening device 60, the door opening device 60 can be downsized. Further, according to the door opening device 60, it is not necessary to further retract the projecting members 61a and 61b from the origin position. Therefore, the driving force for retreating is unnecessary, and the efficiency as the driving mechanism is high, and energy is wasted. Less is. Moreover, according to the door opening device 60, since the operation amount of the protruding members 61a and 61b can be increased within a limited space, there is an effect that the opening operation of the doors 2a and 2b is stabilized.

Next, an example of a preferable configuration of the door opening device 60 will be described.
FIG. 37 is a plan view schematically showing a preferred example of the door opening device. Note that, unlike FIG. 8, FIG. 37 omits the illustration of the rotating plates 73a and 73b, and simplifies the drawing of the large gear 76 and the connecting plate 65.

As shown in FIG. 37, the connecting plates 65a and 65b have a substantially right triangle shape in which the rear side (back side) of the door opening device 60 is tapered and the inside is a hypotenuse in plan view. Accordingly, the rear side of the space between the left and right connecting plates 65a and 65b is widest on the rear side.
Since the motor 82, the reduction gear train 83, and the wiring space 81 are arranged in series along the back surface in the widest space, the space can be effectively used to the maximum.

  Further, since the motor 82 and the reduction gear train 83 are arranged along the back surface, the driving sound of the motor 82 and the meshing sound generated from the reduction gear train 83 are generated from the side farthest from the user. Therefore, according to the door opening device 60, there is an effect that low noise can be achieved.

  Further, the rotation plate centers 74 a and 74 b that are the rotation centers of the intermittent drive gears 78 a and 78 b and the rotation plates 73 a and 73 b and the front side that is the second side of the connection plates 65 a and 65 b are the front side of the case 62. It is arrange | positioned so that it may adjoin to the case intermediate position 100 which is an intermediate | middle with a back surface. With such an arrangement, when the protruding members 61 a and 61 b are retracted, the connecting plates 65 a and 65 b are arranged on the back side of the case 62 from the case intermediate position 100. Further, the projecting members 61 a and 61 b are arranged on the front side of the case 62 with respect to the case intermediate position 100.

Further, since the maximum protruding amount H2 of the protruding members 61a and 61b is substantially equal to the length of the connecting plates 65a and 65b, when the protruding member 61a shown by the broken line in FIG. 37 protrudes to the maximum, the connecting plate 65a. Is located in front of the case middle position 100.
According to such a door opening device 60, the length of the case 62 in the front-rear direction may be approximately twice the length of the connecting plates 65a, 65b in the front-rear direction. There is an effect that the door opening device 60 can be downsized.

  Further, in the door opening device 60, the large gear 76 is arranged so as to be located in front of the reduction gear train 83 and in front of the intermittent drive gears 78 a, 78 b, so that the diameter of the large gear 76 is achieved. Can be enlarged. Thereby, the meshing of these gears can be ensured, and the relationship of the meshing angles θ0, θ2, θ6 (see FIG. 10) between the large gear 76 and the intermittent drive gears 78a, 78b can be appropriately set. effective.

  Further, in the door opening device 60, the detection unit 104 including the switch levers 96a and 96b and the detection switches 95a and 95b is arranged on the front side of the large gear 76, so that the detection unit 104 has intermittent drive gears 78a and 78b. And rotating plates 73a and 73b (see FIG. 8) and the like. As a result, the opening device 60 has an effect that the wiring from the detection switches 95a and 95b is protected from the above-described driving portion, so that the reliability is high. Further, by disposing the detection unit 104 in front of the large gear 76, the door opening device 60 can appropriately detect the detection switches 95a and 95b from the cam unit 99 provided on the large gear 76 via the switch levers 96a and 96b. There is an effect that an ON / OFF operation is possible.

<Block diagram>
Next, the configuration of a control system for controlling the door opening device 60 will be described.
As described above, the control board 41 (see FIG. 2) is attached to the upper surface side of the ceiling wall of the refrigerator 1.

FIG. 38 is a block diagram illustrating a configuration of a control system of the door opening device.
As shown in FIG. 38, a control board 41 as a control unit is connected to a power source 42 that generates a direct current of a predetermined voltage from a commercial power source. The control board 41 is connected to the compressor 6, the internal fan 9, the door opening device 60, and the door sensor 49, and is configured to drive and control them.

  The control board 41 is connected to the left door switch 48a and the right door switch 48b. As described above, the left door switch 48a and the right door switch 48b are provided on the doors 2a and 2b. When the user operates the left door switch 48a or the right door switch 48b, the signal is transmitted to the control board 41.

  The control board 41 is connected to the motor 82 of the door opening device 60 and the detection switches 95a and 95b. Further, electric power necessary for driving the door opening device 60 and the control board 41 is supplied from the power source 42.

<Initialization operation>
Next, in the door opening device 60 of the embodiment, control of initialization operation when the power source 42 is turned on will be described. FIG. 39 is a flowchart showing a control procedure of the initialization operation of the door opening device.
As shown in FIG. 39, when the control board 41 as the control unit is activated by turning on the power to the door opening device 60, the control unit executes an initialization program.
First, the control unit confirms the states of the detection switches 95a and 95b, the door sensor 49, and various temperature sensors (not shown) and starts the initial setting (step S101).

  Next, the control unit checks the detection switches 95a and 95b (simply referred to as detection A / detection B in FIG. 39), and determines whether or not the switch is OFF / OFF (step S102). At this time, if it is OFF / OFF (Yes in step S102), since it is in the state of FIG. 20 (3), it can be confirmed that the large gear 76 is at the origin position, and the initialization program is terminated.

  If the detection switches 95a and 95b are not OFF / OFF (No in step S102), the control unit checks the detection switches 95a and 95b to determine whether or not they are ON / ON (step S103). ). And if detection switch 95a, 95b is ON / ON (Yes of step S103), since it is in the state of FIG. 20 (1) or (5), either protrusion member 61a, 61b is the maximum protrusion amount H2. It can be confirmed that it is in a protruding state. The process moves to the next step S104.

In step S104, the control unit drives the motor 82 in the normal direction, that is, in the direction in which the left protruding member 61a further protrudes.
When the control unit detects an overcurrent of the motor 82 (Yes in step S105), the control unit 61a is in the state of protruding with the maximum protrusion amount H2, that is, the state of FIG. Since it can be confirmed that the gear stopper 76E comes into contact with the cover stopper 71 and the motor 82 is forcibly stopped, the process proceeds to step S106.

When the control unit does not detect the overcurrent of the motor 82 (No in step S105), the control unit moves to step S113 and the detection switch 95b (referred to as detection B in FIG. 39) is turned from ON to OFF. Check whether or not. If the detection switch 95b remains ON (No in Step S113), Step S113 is repeated. If the detection switch 95b is OFF (Yes in Step S113), the process proceeds to Step S114 described later.
In step S105, instead of determining whether or not an overcurrent of the motor 82 is detected, a determination is made as to whether or not the detection switches 95a and 95b remain ON / ON even after a predetermined time has elapsed. You can also

Next, in step S106, the control unit reverses the polarity of the power source, reverses the rotation direction of the motor 82, and drives in the reverse rotation direction, that is, the direction in which the protruding member 61a is drawn.
Next, after a predetermined time has elapsed, the control unit checks whether or not the detection switch 95a (referred to as detection A in FIG. 39) has changed from ON to OFF (step S107), and the detection switch 95a has been turned OFF. If it is (Yes in step S107), the process proceeds to step S108. If the detection switch 95a is not OFF (No in step S107), the determination in step S107 is repeated.

When the control unit confirms that the detection switches 95a and 95b are OFF / ON (step S108), the process proceeds to step S109 because the state shown in FIG.
In step S109, the control unit confirms that the large gear 76 is not at the origin position but at a position meshed with the left intermittent drive gear 78a.

Next, the control unit drives the motor 82 in the reverse direction, and drives it in the direction in which the protruding member 61a is pulled, that is, the side in which the large gear 76 moves in the home direction (step S110).
Then, the control unit checks whether or not the detection switch 95b has been turned off from ON (step S111), and when the detection switch 95b is turned off (Yes in step S111), the state shown in FIG. Since it is the origin position, the process proceeds to step S112. If the detection switch 95b is not OFF (No in step S111), the process returns to step S110.

  In step S112, the motor 82 is stopped and the initialization program is terminated. Note that the transition from step S111 to step S112 can also be performed after a predetermined time has elapsed after the detection switch 95b is turned off.

In step S103, when the control unit confirms that the detection switches 95a and 95b are not ON / ON but OFF / ON, the control unit proceeds to step S108.
In step S103, when the control unit confirms that the detection switches 95a and 95b are not ON / ON but ON / OFF, the control unit proceeds to next step S114.

In step S114, when the control unit confirms that the detection switches 95a and 95b are ON / OFF, the process proceeds to step S115 because it is in the state of FIG. 20 (4).
In step S115, the control unit confirms that the large gear 76 is not at the origin position but is in a position meshed with the right intermittent drive gear 78b.

Next, the control unit drives the motor 82 in the forward rotation direction and drives it in the direction in which the right protruding member 61a is pulled, that is, the side on which the large gear 76 moves in the origin direction (step S116).
Then, the control unit confirms whether or not the detection switch 95a has been turned off from ON (step S117), and when the detection switch 95a is turned off (Yes in step S117), the state shown in FIG. Since it is the origin position, the process proceeds to step S118. If the detection switch 95a is not OFF (No in step S117), the process returns to step S116.

In step S118, the motor 82 is stopped and the initialization program is terminated. Note that the transition from step S117 to step S118 can also be performed after a predetermined time has elapsed after the detection switch 95a is turned off.
By the initialization operation performed by the control unit described above, the large gear 76 is in the “origin range” (detection A / B = OFF / OFF state) that does not mesh with any of the intermittent drive gears 78a and 78b.

<Left door operation>
Next, the door opening operation (left door opening operation) for opening the left door 2a will be described.
FIG. 40 is a flowchart illustrating a control procedure of the left-side door opening operation performed by the controller of the door opening device. When the user operates the left opening switch 48a, the control board 41 (control unit) executes a door opening program for the left door 2a.

  First, the control unit monitors the states of the detection switches 95a and 95b and confirms whether or not the opening device 60 is at the origin position (whether or not the detection A / B is OFF / OFF) (step S121). ), And moves to the next step 122. If not at the origin position, although not shown, the control unit executes the initialization program and proceeds to step S122.

In step S122, the control unit monitors whether or not the left door switch 48a is operated. If the left door switch 48a is operated (Yes in step S122), the control unit proceeds to step S123. If the left door switch 48a is not operated (No in step S122), the process of step S122 is repeated.
In step S123, the control unit energizes the motor 82 in the normal rotation direction, that is, the polarity that causes the large gear 76 to rotate in the direction in which the large gear 76 meshes with the intermittent drive gear 78a.

  Next, the control unit checks whether or not the detection switch 95b has been turned on from OFF (step S124). Then, when the detection switch 95b is turned on (Yes in step S124), the control unit proceeds to step S125. If the detection switch 95b is not turned on (No in step S124), step S124 is repeated.

In step S125, the control unit confirms that the large gear 76 is rotating in the forward rotation direction and meshed with the intermittent driving gear 78a on the left side, and is in the state of FIG. The process moves to step S126.
In step S126, the control unit monitors whether or not the detection switch 95a is switched from OFF to ON. And when it becomes ON (Yes of step S126), since it will be in the state of FIG. 20 (1), a control part will move to step S127. In addition, when the detection switch 95a is not turned on (No in Step S126), the control unit repeats Step S126.

  In step S127, the control unit checks whether or not a predetermined time T1 has elapsed. The predetermined time T1 is a time necessary for the protrusion members 61a and 61b to be set to the maximum protrusion amount H2 after the detection switches 95a and 95b are turned from OFF to ON, in other words, FIG. 34 (e) to FIG. 34 (f). It is the time to reach and is determined by a preliminary test or the like. When the predetermined time T1 has elapsed (Yes in step S127), the control unit moves to step S128. If the predetermined time has not elapsed (No in step S127), step 127 is repeated.

After confirming that the protruding member 61a has completed the protruding operation (step S128), the control unit reverses the polarity of the voltage applied to the motor 82 and rotates the motor 82 in the reverse direction (step S129). The process moves to the next step S130.
In step S130, the control unit monitors whether the detection switch 95a is turned from ON to OFF. Then, when it is turned off (Yes in step S130), the state shown in FIG. 20 (2) is entered, so that it is confirmed that the drawing operation is being performed, and the process proceeds to the next step S131. In addition, when the detection switch 95a is not OFF (No in Step S130), the control unit repeats Step S130.

In step S131, the control unit monitors whether the detection switch 95b is turned from ON to OFF. Then, when turned off (Yes in step S131), the state shown in FIG. In addition, when the detection switch 95b is not OFF (No in Step S131), the control unit repeats Step S131.
In step S132, the control unit confirms that the large gear 76 has returned to the “origin range” (detection A / B is OFF / OFF), stops the motor 82 (step S133), and the left door 2a. Complete the left door opening operation.

<Right door opening action>
Next, the door opening operation (right door opening operation) for opening the right door 2b will be described.
FIG. 41 is a flowchart illustrating a control procedure of the right-side door opening operation performed by the controller of the door opening device. When the user operates the right door switch 48b, the control board 41 (control unit) executes a door opening program for the right door 2b.

  First, the control unit monitors the states of the detection switches 95a and 95b and confirms whether or not the opening device 60 is at the origin position (whether or not the detection A / B is OFF / OFF) (step S221). ), And moves to the next step 222. If not at the origin position, the control unit executes the initialization program, but proceeds to step S222 (not shown).

In step S222, the control unit monitors whether or not the right door switch 48b is operated. If the right door switch 48b is operated (Yes in step S222), the control unit proceeds to step S223. When the right door switch 48b is not operated (No at step S222), the process at step S222 is repeated.
In step S223, the control unit energizes the motor 82 in the reverse rotation direction, that is, the polarity that causes the large gear 76 to rotate in the direction in which the large gear 76 meshes with the intermittent drive gear 78b.

  Next, the control unit confirms whether or not the detection switch 95a is turned on from OFF (step S224). Then, when the detection switch 95a is turned on (Yes in step S224), the control unit proceeds to step S225. If the detection switch 95a (detection A) is not ON (No in step S224), this step S224 is repeated.

In step S225, the control unit confirms that the large gear 76 is rotating in the reverse direction and meshes with the intermittent driving gear 78b on the right side and is in the state of FIG. The process moves to S226.
In step S226, the control unit monitors whether or not the detection switch 95b (detection B) is turned from OFF to ON. And when it becomes ON (Yes of step S226), since it will be in the state of FIG. 20 (5), a control part moves to step S227. In addition, when the detection switch 95b is not turned on (No in Step S226), the control unit repeats Step S226.

  In step S227, the control unit checks whether or not a predetermined time T2 has elapsed. The predetermined time T2 is a time required for the protrusion members 61a and 61b to have the maximum protrusion amount H2 after the detection switches 95a and 95b are turned on from OFF, in other words, from FIG. 34 (e) to FIG. 34 (f). It is the time to reach and is determined by a preliminary test or the like. When the predetermined time T2 has elapsed (Yes in step S227), the control unit moves to step S228. If the predetermined time T2 has not elapsed (No in step S227), step 227 is repeated.

After confirming that the right protruding member 61b has completed the protruding operation (step S228), the control unit reverses the polarity of the voltage applied to the motor 82 and rotates the motor 82 in the forward rotation direction (step S228). S229), the process proceeds to the next step S230.
In step S230, the control unit monitors whether the detection switch 95b is turned from ON to OFF. Then, when it is turned off (Yes in step S230), the state shown in FIG. 20 (4) is obtained, so that it is confirmed that the pulling operation is being performed, and the process proceeds to the next step S230. In addition, when the detection switch 95b is not OFF (No in Step S230), the control unit repeats Step S230.

In step S231, the control unit monitors whether the detection switch 95a is turned from ON to OFF. Then, when turned off (Yes in step S231), the state shown in FIG. 20 (3) is entered, and the process proceeds to step S232. In addition, when the detection switch 95a is not OFF (No in Step S231), the control unit repeats Step S231.
In step S232, the control unit confirms that the large gear 76 has returned to the “origin range” (detection A / B is OFF / OFF), stops the motor 82 (step S233), and the right door 2b. Complete the door opening operation on the right side.

Next, the detection operation of the left opening switch 48a and the detection switches 95a and 95b, the rotation operation of the motor 82, and the operation procedure of the rotating plate 73a and the protruding member 61a when the left door 2a is opened will be described.
FIG. 42 is a timing chart showing each operation of the door opening switch, the detection switch, and the motor during the left door opening operation in the door opening device.
As shown in FIG. 42, the opening device 60 at t = 0 has already been initialized and is at the origin position.

The left opening switch 48a is operated and turned on by t = ta. In the present embodiment, the motor 82 is driven in the forward direction from the time when the left opening switch 48a is turned from ON to OFF. Since the motor 82 rotates in the forward direction, the large gear 76 operates clockwise (CW direction), and the detection switch 95b is turned from OFF to ON at t = tb.
When the motor 82 is continuously rotated clockwise (CW direction), which is the normal rotation direction, the large gear 76 and the intermittent drive gear 78a mesh with each other at t = tc. The intermittent drive gear 78a and the rotating plate 73a start to rotate counterclockwise (CCW direction), the protruding member 61a starts to protrude, and the door 2a starts to open.

At t = td, the detection switch 95a is turned from OFF to ON, and it can be detected that the protruding member 61a is just before the maximum protruding amount H2. Thereby, at t = te after a predetermined time T1 has elapsed from t = td, when the motor 82 is decelerated and stopped at t = tf, the protruding member 61a protrudes at the maximum protruding amount H2.
Thereafter, the motor 82 is rotated in the reverse direction at t = tg, and the large gear 76 is rotated counterclockwise (CCW direction), whereby the protruding member 61a starts to be retracted.
At t = th, the detection switch 95a is turned from ON to OFF, and at t = tj, the projecting member 61a is pulled in, and the meshing between the intermittent drive gear 78a and the large gear 76 is finished.

At t = tk, the detection switch 95b is turned from ON to OFF, and it can be confirmed that the large gear 76 is in the vicinity of the origin position. Thus, if the motor 82 is stopped after a predetermined time until t = tm, the large gear 76 returns to the origin position.
Thus, the opening operation of the left door 2a by the opening device 60 is completed.

Next, the detection operation of the right opening switch 48b and the detection switches 95a and 95b, the rotation operation of the motor 82, and the operation procedure of the rotating plate 73b and the protruding member 61b when the right door 2b is opened will be described.
FIG. 43 is a timing chart showing each operation of the door opening switch, the detection switch, and the motor during the right door opening operation in the door opening device.
As shown in FIG. 43, the opening device 60 at t = 0 has already been initialized and is at the origin position.

The right door switch 48b is operated and turned on by t = ta. In the present embodiment, the motor 82 is driven in the reverse direction from the time when the right door switch 48b is turned from ON to OFF. Since the motor 82 rotates in the reverse direction, the large gear 76 operates counterclockwise (CCW direction), and the detection switch 95a is turned from OFF to ON at t = tb.
When the motor 82 is continuously rotated counterclockwise (CCW direction), which is the reverse rotation direction, the large gear 76 and the intermittent drive gear 78b mesh with each other at t = tc. The intermittent drive gear 78b and the rotating plate 73b start to rotate clockwise (CW direction), the protruding member 61b starts to protrude, and the door 2b starts to open.

At t = td, the detection switch 95b is switched from OFF to ON, and it can be detected that the protruding member 61b is just before the maximum protruding amount H2. Thereby, at t = te after a predetermined time T2 has elapsed from t = td, when the motor 82 is decelerated and stopped at t = tf, the protruding member 61b protrudes at the maximum protruding amount H2.
Thereafter, the motor 82 is rotated in the forward rotation direction at t = tg, and the large gear 76 is rotated in the clockwise direction (CW direction), whereby the protruding member 61a starts to be retracted.

At t = th, the detection switch 95b is turned from ON to OFF, and at t = tj, the protruding member 61b is pulled in, and the meshing between the intermittent drive gear 78b and the large gear 76 is completed.
At t = tk, the detection switch 95a is turned from ON to OFF, and it can be confirmed that the large gear 76 is in the vicinity of the origin position. Thus, if the motor 82 is stopped after a predetermined time until t = tm, the large gear 76 returns to the origin position.
Thus, the opening operation of the right door 2b by the opening device 60 is completed.

According to the opening device 60 of this embodiment and the refrigerator 1 provided with the same, the following effects can be produced.
According to the present embodiment, the door opening device 60 including the motor 82, the reduction gear train 83, and the protruding members 61a and 61b is provided. Can be prevented from opening vigorously. Thus, even if the doors 2a and 2b are enlarged, the door opening operation can be performed without a sense of incongruity.

  In the present embodiment, the opening angle θd (for example, 10 °) of the doors 2a and 2b when the doors 2a and 2b are pushed open by the projecting members 61a and 61b is less than the first predetermined angle (for example, 15 °). Is set to According to this, even if the opening angle provided in the closer 37 in order to prevent a half door is set large, door opening operation | movement can be performed. Moreover, since the protrusion amount of protrusion member 61a, 61b can be restrained short, it can suppress that the door opening apparatus 60 enlarges.

  Further, in the present embodiment, the closer 37 is closed with respect to the doors 2a and 2b when the opening angle of the doors 2a and 2b is equal to or larger than a second predetermined angle (90 °) larger than the first predetermined angle (for example, 15 °). The third inclined surfaces 38e and 39f for applying the rotational torque are provided. According to this, when opening the doors 2a and 2b with the door opening device 60, the doors 2a and 2b can be stopped at the position of the second predetermined angle, and the doors 2a and 2b can be prevented from opening too much.

  In the present embodiment, the closer 37 generates both a rotational torque in the closing direction and a rotational torque in the opening direction at a third predetermined angle (for example, 105 °) that is greater than the second predetermined angle (for example, 90 °). The horizontal surfaces 38f and 39g that are not allowed to be provided According to this, the doors 2a and 2b can be used in a state where the doors 2a and 2b are opened larger than 90 ° (for example, 120 °), and usability can be improved.

  Thus, the maximum protrusion amount H2 of the protruding members 61a and 61b of the door opening device 60 cannot be set large, and the range of the opening angle of the doors 2a and 2b by the door opening device 60 is limited. Therefore, by opening to the range (15 ° or more) of the rotational torque in the opening direction of the closer 37 while decelerating by the inertia force generated when the doors 2a and 2b are pushed open by the opening device 60, the first on the movable side. The door opening speed v2 of the doors 2a and 2b when the inclined surface 39d exceeds the first inclined surface 38c on the fixed side is within an appropriate speed range, and the doors 2a and 2b can be opened to 90 ° or near 90 °. Note that when the opening speed of the doors 2a and 2b when the maximum protrusion amount H2 is opened by the door opening device 60 is v1, v1> v2.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can implement with a various form.
In the present embodiment, the doors 2a and 2b have been described by taking as an example a configuration in which the door opening operation is performed by the single door opening device 60. The structure which operates a door opening apparatus by a respectively separate mechanism may be sufficient. When the door 2a is a door opening device that opens the door, the driving force of the fourth small gear 90b of the reduction gear train 83 may be transmitted to the connecting plate 65a of the protruding member 61a.

  A preferred shape of the contact surface provided on the doors 2a and 2b that receives the pressing force from the protruding members 61a and 61b when the doors 2a and 2b are opened by the protruding members 61a and 61b will be described.

  44 (a) and 44 (b) are operation explanatory views when the protruding member comes into contact with the flat contact surface of the freezer compartment door. 45 (a) and 45 (b) are operation explanatory views when the projecting member comes into contact with the contact surface formed of the circumferential surface of the semi-column of the freezer compartment door.

As shown in FIG. 44 (a), when the door 2a is closed, the contact surface 93 that faces the protruding member 61a has a plane orthogonal to the protruding direction of the protruding member 61a.
The door opening device 60 starts the door opening operation, and the tip of the protruding member 61a comes into contact with the contact surface 93. At this time, since the contact surface 93 is orthogonal to the protruding member 61a, the protruding force P is orthogonal to the contact surface 93 and becomes a compressive force with respect to the protruding member 61a.

  As shown in FIG. 44B, when the door 2a is opened by an angle θd, the contact surface 93 is inclined by an angle θd with respect to the protruding member 61a. Thereby, the protruding force P is decomposed into a normal direction component force P1 and a tangential direction component force P2. Of these, the tangential component force P2 becomes a bending moment M with respect to the protruding member 61a, and thus a bending stress is generated in the protruding member 61a. It is also conceivable that the frictional resistance load increases due to the pressing force increasing due to the bending moment M between the connecting plate 65a and the guide rail 66a.

As shown in FIG. 45 (a), when the door 2a is closed, the contact surface 93 that faces the protruding member 61a is formed by a semicircular cylindrical peripheral surface.
When the door opening device 60 starts the door opening operation and the tip of the protruding member 61a comes into contact with the contact surface 93, the protruding force P at the contact position between the contact surface 94 and the protruding member 61a is equal to the contact surface 94. Since they are orthogonal to each other, a compressive force is applied to the protruding member 61a in the same manner as the contact surface 94 having a flat surface shown in FIG.

As shown in FIG. 45 (b), the contact surface 94 is formed of a semi-cylindrical circumferential surface, so that even if the door 2a is opened and inclined by the angle θd, the direction of the protruding force P is the contact surface. Orthogonal to 94. Therefore, the force transmitted from the protruding member 61a to the contact surface 94 becomes a compressive force with respect to the protruding member 61a, and unlike the case shown in FIG. 44 (b), a bending moment due to a tangential component force does not occur. Therefore, no bending stress is generated in the protruding member 61a, and the gap between the connecting plate 65a and the guide rail 66a is not distorted. Therefore, the opening device 60 is improved in reliability without increasing the frictional resistance load.
In the above description, the case where the left door 2a is opened has been described. However, the case where the right door 2b is opened can be configured in the same manner except that it is symmetrical with the left door 2a. Can be played.

Next, a configuration example of a door opening device suitable for preventing water intrusion will be described.
FIG. 46 is a plan view of a door opening device having a waterproof rib. 46, unlike FIG. 8, a state in which the large gear 76 and the intermittent drive gears 78a and 78b are removed is illustrated.

As shown in FIG. 46, the door opening device 60 can divide the inside of the case 62 into a first range 105, a second range 106, and a third range 107.
The first range 105 is an operation / rotation range of the protruding member 61a, the connecting plate 65a, and the rotating plate 73a on the left side of the door opening device 60, and is hatched for convenience.
The third range 107 is an operation / rotation range of the protruding member 61b, the connecting plate 65b, and the rotating plate 73b on the right side of the door opening device 60, and is hatched for convenience.
The second range 106 is formed between the first range 105 and the third range 107, and includes a motor 82, detection switches 95a and 95b, and a wiring space 81 connected by electric wiring (not shown). It is a range.

Further, the door opening device 60 is formed with a waterproof rib 55a and a waterproof rib 55b so as to partition the inside of the case 62.
The waterproof rib 55 a has one end connected to the front surface of the case 62 and the other end connected to the back surface of the case 62 so as to partition the first range 105 and the second range 106.

Further, the waterproof rib 55 b has one end connected to the front surface of the case 62 and the other end connected to the back surface of the case 62 so as to partition the second range 106 and the third range 107.
Since the openings 62a and 63b for the protruding members 61a and 61b to perform the protruding operation are formed in the case 62, liquid such as water enters the first range 105 or the third range 107 from the openings 63a and 63b. Even when the liquid enters, the liquid can prevent the liquid from entering the second area 106 by the waterproof ribs 55a and 55b.
That is, according to the door opening device 60, liquid can be prevented from entering the second range 106 including the motor 82, the detection switches 95a and 95b, and the wiring space 81, so that the electrical wiring is short-circuited by the liquid. Can be reliably prevented, and reliability is improved.

Next, modified examples of the connecting plate 65a and the rotating plate 73a will be described.
FIG. 47 is a plan view showing a modification of the rotating plate and the connecting plate. 48 (a) to 48 (f) are operation explanatory views of a rotating plate and a connecting plate according to a modification. 48A to 48F, reference numerals ra to rq denote teeth 201A to 201P provided on the connecting plate 65a of the connecting plate 65a and teeth 202a to teeth 202q provided on the rotating plate 73a. And the meshing pitch circle radius.

  As shown in FIG. 47, teeth 202a to 202q (total number of teeth 14) meshing with teeth 201A to 201P (total number of teeth 13) of the connecting plate 65a are formed around the rotating plate 73a.

The teeth 202a to 202q of the rotating plate 73a are formed so as to gradually increase in radius from the rotating plate center 74a except for the teeth 202b in the clockwise direction around the rotating plate center 74a in the plan view of FIG. Yes.
More specifically, as shown in FIGS. 48 (a) to 48 (f), when the meshing pitch circle radius from the teeth 202a to the teeth 202q provided on the rotating plate 73a is changed from ra to rq, ra = It is set so as to satisfy the relational expression of rb <rc <rd <re <rf <rg <rh <rj <rk <rm <rn <rp <rq.

That is, in the rotary plate 73a shown in FIG. 12, the relationship between the meshing pitch circle radius ra and the meshing pitch circle radius rb adjacent thereto is ra <rb, whereas FIG. And as shown to (b), in the rotating plate 73a which concerns on a modification, it is ra = rb. That is, since ra = rb, the pitch circle radii of the teeth 202a, teeth 202b, and teeth 202c provided on the rotating plate 73a are equal.
Further, as shown in FIG. 47, the section extending from the teeth 201A to the teeth 201B provided on the connecting plate 65a is not tapered.

Next, operations of the rotating plate 73a and the connecting plate 65a according to the modification will be described.
As shown in FIG. 48A, the rotating plate 73a is at the origin position. As described above, the left opening switch 48a is operated by the user, and the rotating plate 73a starts to rotate counterclockwise.

  As shown in FIG. 48 (b), the teeth 201C of the connecting plate 65a mesh between the teeth 202c, 202d of the rotating plate 73a, and the connecting plate 65a moves forward (the left side of FIG. 48, the same in FIG. 48 below). Move to. Thereby, the protruding member 61a starts to perform a protruding operation. That is, the door 2a starts to open.

  As shown in FIG. 48C, the rotating plate 73a further rotates, and the teeth 201F of the connecting plate 65a mesh between the teeth 202f and 202g of the rotating plate 73a, so that the connecting plate 65a further moves forward.

  As shown in FIG. 48 (d), the rotating plate 73a further rotates, and the teeth 201J of the connecting plate 65a mesh between the teeth 202j and 202k of the rotating plate 73a, so that the connecting plate 65a further moves forward.

  As shown in FIG. 48E, the rotating plate 73a further rotates, and the teeth 201N of the connecting plate 65a mesh between the teeth 202n and 202p of the rotating plate 73a, so that the connecting plate 65a further moves forward.

As shown in FIG. 48 (f), the rotating plate 73a further rotates, and the teeth 202q on the outermost periphery of the rotating plate 73a press the teeth 201P at the rear end of the connecting plate 65a forward. The connecting plate 65a further moves forward to project the projecting member 61a so that the maximum projecting amount H2 (see FIG. 25) is obtained. The protruding speed of the protruding member 61a is the maximum speed, and stops immediately thereafter.
Then, as described above, the rotating plate 73a rotates in the reverse direction (clockwise), and reaches the origin position shown in FIG. 48 (a) through the state of FIG. 48 (f) to FIG. 48 (b). Return.

  In the above-described embodiment, the case where two meshing pitch circle radii ra and rb are the same has been described as an example, but the case where three meshing pitch circle radii ra, rb and rc are the same may be used, It may be the above.

  FIG. 49A to be referred to next is a graph showing the relationship between speed and time when the protruding member protrudes in association with the rotating plate and the connecting plate according to the modification of FIG. These are graphs showing the relationship between force and time. In FIGS. 49 (a) and 49 (b), t = 0 indicates the state of FIG. 48 (a), which is the time when the protruding member 61a starts to operate. T is a time [T = (t2−t1)] until the protruding member 61a reaches the maximum velocity or the maximum angular velocity ωdmax (where t1 is the time until the state shown in FIG. 48A). Yes, t2 is the time until it becomes FIG. 48 (f)).

As shown in FIG. 49 (a), from the time t1 when the state shown in FIG. 48 (a) is reached until the time t4 when the state shown in FIG. This is because the teeth 202a, teeth 202b, and teeth 202c of the rotating plate 73a having the same pitch circle radius mesh with a section extending from the teeth 201A to the teeth 201B of the connecting plate 65a that is not tapered. Incidentally, the projecting speed of the projecting member 61a is equal to Va represented by the formula 2.
Thereafter, until the time t2 at which the state shown in FIG. 48 (f) is reached, the protruding member 61a performs an accelerating motion that approximates a uniform acceleration motion. The velocity Vq of the protruding member 61a is a tangential velocity at the portion of the pitch circle radius rq, and is equal to Vq represented by the above equation 3.

  As shown in FIG. 49B, the projecting output of the projecting member 61a is constant at the maximum value Pa from the time t1 when the state shown in FIG. 48A is reached to the time t4 when the state becomes FIG. is there. Thereafter, until time t2 at which the state of FIG. 48 (f) is reached, the projecting output of the projecting member 61a decreases as the pitch circle radius of the rotating plate 73a meshing with the connecting plate 65a increases from rc to rq. The projecting output of the projecting member 61a has a uniform decreasing tendency so as to become the minimum value Pq at time t2.

  In other words, the operation of the projecting member 61a has a speed as small as Va from the start of the projecting operation, but the first section from time t1 to t4 for maintaining the maximum projecting output Pa uniformly, and the speed increases with time. In addition, it has a bent protruding speed characteristic and a protruding output characteristic in which the second section from time t4 to time t2 in which the protruding output decreases with time continues.

  The door opening device 60 including the rotating plate 73a and the connecting plate 65a according to such a modification is characterized in that the door opening force of the doors 2a and 2b is maximized at θd = 0 (see FIG. 32) at the beginning of opening. . Therefore, if the maximum projecting output is maintained from time t1 to time t4 at the start of the projecting operation of the projecting member 61a, there is an effect that the door packing 15 is reliably peeled off and the door opening operation is performed reliably. Moreover, since the load by negative pressure is assumed in the door 2a in this embodiment, the opening force for the load by negative pressure can also be ensured, and there exists an effect which performs door opening operation | movement reliably.

  In the embodiment, the brush type DC motor has been described as an example of the motor 82 whose rotating shaft rotates in both forward and reverse directions, but the present invention is not particularly limited as long as the motor rotates in both forward and reverse directions. For example, a pulse motor or the like can be used.

  In the present embodiment, since the freezer compartment 10g is independent as described above, if the freezer compartment door 2a is opened and then opened again immediately after opening, the inside of the freezer compartment 10g becomes negative pressure and the door is opened. Power becomes excessive. Therefore, when opening the freezer compartment door 2a immediately after the opening is closed, the duty of the motor 82 may be increased (the ON time is lengthened) at the start of the opening operation. Thereby, the stable opening operation | movement of the door 2a is attained.

1 Refrigerator 2a Freezer compartment door
2b Cold room door (door)
DESCRIPTION OF SYMBOLS 10 Heat insulation box 10e, 10f Opening 10g Freezing room 10h Refrigeration room 17a, 17b Hinge 37 Closer (rotation torque provision member)
38 Fixed side torque application part
38a Ring part (fixed side ring part)
38c 1st inclined surface (1st rotational torque provision part , fixed side 1st inclined surface )
38d 2nd inclined surface (2nd rotational torque provision part , fixed side 2nd inclined surface )
38e 3rd inclined surface (3rd rotational torque provision part , fixed side 3rd inclined surface )
38f horizontal surface (rotation torque non-applying part)
39 Movable side torque application part
39a Ring part (movable side ring part)
39d 1st inclined surface (1st rotational torque provision part , movable 1st inclined surface )
39e 2nd inclined surface (2nd rotational torque provision part , movable side 2nd inclined surface )
39f 3rd inclined surface (3rd rotational torque provision part , movable 3rd inclined surface )
39g horizontal surface (rotation torque non-applying part)
41 control board 48a left door switch 48b right door switch 60 door opening device 61a, 61b protruding member 64a tip member 64b tip member 65a connecting plate 65b connecting plate 73a rotating plate (gear part)
73b Rotating plate (gear part)
76 Large gear (gear part)
78a Intermittent drive gear (gear part)
78b Intermittent drive gear (gear part)
82 Motor 83 Reduction gear train (gear part)
95a Detection switch 95b Detection switch 96a Switch lever 96b Switch lever 96Ca Switch lever tip 96Cb Switch lever tip 97 Detection spring G Door weight ψ1 First predetermined angle ψ2 Second predetermined angle ψ3 Third predetermined angle

Claims (2)

A heat insulating box having an opening on the front surface;
A rotary door that opens and closes the opening;
An opening device for operating the door from a closed state to an open state;
A rotation torque applying member that applies a rotation torque in a closing direction and a rotation torque in an opening direction to the door by its own weight; and
The door opening device includes a motor capable of rotating in both forward and reverse directions, a gear portion that transmits the driving force of the motor while reducing the rotation of the motor, and closing the door via the driving force of the gear portion. A projecting member that pushes from the state to the open state,
The rotation torque application member includes a first rotation torque application unit that applies rotation torque in the closing direction to the door when the door opening angle is less than a first predetermined angle, and the door opening angle is a first predetermined angle. A second rotational torque applying unit that applies rotational torque in the opening direction to the door at an angle or more, and the door opening angle to the door at a second predetermined angle that is greater than the first predetermined angle. A third rotational torque applying unit for applying a rotational torque in the closing direction ,
The rotational torque application member has a fixed side first inclined surface as the first rotational torque application part and a fixed side second as the second rotational torque application part on the upper surface of the fixed side ring part attached to the heat insulating box. An inclined surface, a fixed-side torque applying portion in which a fixed-side third inclined surface is successively formed along the circumferential direction as the third rotational torque applying portion, and a lower surface of a movable-side ring portion attached to the door In addition, the movable side first inclined surface as the first rotational torque applying portion, the movable second inclined surface as the second rotational torque applying portion, and the second rotational torque applying portion so that the fixed side ring portion is shaped upside down. A movable side torque applying portion formed in order along the circumferential direction opposite to the fixed side torque applying portion as a movable side third inclined surface as a three-rotation torque applying portion;
When the door is in the closed state, the stationary side first inclined surface and the movable side first inclined surface are in partial contact with each other, and the rotational torque in the closing direction is applied to the door,
When the door opens more than the second predetermined angle, the movable first inclined surface abuts on the fixed third inclined surface, and the movable third inclined surface is in contact with the fixed first inclined surface. By abutting, the rotational torque in the opening direction is eliminated with respect to the door, and the rotational torque in the closing direction is generated,
When the door is pushed open from the closed state to the open state by the projecting member, an opening angle of the door is set to be less than the first predetermined angle, and the pushing force of the projecting member is set to the first movable side. The refrigerator is characterized in that the inclined surface is set to a force that can overcome the fixed-side first inclined surface . The rotational torque applying member includes a rotational torque non-applying portion that does not generate the rotational torque in the closing direction and the rotational torque in the opening direction when the door opening angle is equal to or greater than a third predetermined angle that is greater than the second predetermined angle. The refrigerator according to claim 1 .

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