JP6227341B2 - Opening device and equipment provided with the same - Google Patents

Description

  The present invention relates to a door opening device and a device including the same.

2. Description of the Related Art Conventionally, a device that opens a rotary door or a drawer door for home appliances, furniture, and the like is known (see, for example, Patent Documents 1 to 3).
Patent Document 1 discloses a device for rotating a transmission gear in both forward and reverse directions by using a driving force of a motor, and simultaneously moving a first projecting member and retreating a second projecting member during the forward rotation. Is described. This device is configured to open the first door when the first projecting member is projected, and to open the second door when the second projecting member is projected.
Patent Document 2 describes a device that opens a door by pushing out a plunger made of a magnetic material by an electromagnetic solenoid.
Patent Document 3 describes a device that converts the rotational force of a motor into a reciprocating linear drive force by a rack and pinion mechanism, thereby pushing out a rod to open a door.

Japanese Patent No. 3604947 Japanese Patent No. 4151966 JP-A-4-17549

However, the apparatus of Patent Document 1 requires a space for accommodating the retracting projecting member because the one projecting member moves forward and the other projecting member retracts at the same time. Therefore, there is a problem that the apparatus becomes large.
Moreover, since the apparatus of patent document 2 is a structure which moves a plunger with an electromagnetic solenoid, it is necessary to provide the space which draws in a plunger in the back of an electromagnetic solenoid. Therefore, there is a problem that the apparatus becomes large.
Further, in the device of Patent Document 3, since the rod projecting operation starts simultaneously with the engagement of the pinion and the rack, the projecting force of the rod decreases, so that a door with a large load at the beginning of opening can be opened smoothly and without a sense of suddenness. There is a problem that cannot be done.

  Accordingly, an object of the present invention is to provide a door opening device that can open adjacent doors smoothly and without a sense of abruptness, and that can achieve a more compact size than conventional ones, and an apparatus including the same.

The door opening device of the present invention that solves the above problems includes a motor capable of forward and reverse rotation, a reduction gear train that transmits the driving force of the motor while reducing the rotation of the motor, and the reduction gear train. A large gear capable of rotating both forward and reverse by transmitting the driving force of the motor, and rotating in mesh with the large gear in a first angle range of the large gear, except for the first angle range The first intermittent drive gear that does not mesh with the large gear and does not rotate, and rotates in mesh with the large gear within the second angle range of the large gear, and rotates without meshing with the large gear outside the second angle range. Not the second intermittent drive gear, the first projecting member that is transmitted to the first intermittent drive gear and projects toward the first door to push the first door open, Drive force is transmitted from the second intermittent drive gear toward the second door A second projecting member which pushes open the second door by leaving, the provided from the first projecting member or the second projecting member starts to protrude operation, the projecting speed of the start And a first section that keeps the projecting output constant, a second section that is continuous with the first section, the projecting speed increases with time, and the projecting output decreases with time,
And a characterized by performing a projection operation of the first projecting member or the second protruding member in response to rotation direction of the motor, it opens the first door or the second door To do.

  Moreover, the apparatus of this invention which solves the said subject is provided with the said door opening apparatus, It is characterized by the above-mentioned.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to open an adjacent door smoothly and without a sense of abruptness, the door opening apparatus which can achieve compactization conventionally, and an apparatus provided with the same can be provided.

It is a front view of the refrigerator in embodiment of this invention. It is a sectional side view which shows typically the AA cross section of FIG. It is a front view showing the structure in the store | warehouse | chamber of a refrigerator. FIG. 3 is an enlarged explanatory view of a main part of FIG. 2. It is the top view of the refrigerator seen from the B direction of FIG. (A)-(c) 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) to (f) is a plan view schematically showing a positional relationship among a large gear, an intermittent drive gear, and a switch lever in the door opening device. 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 left-right refrigerator compartment 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 refrigerator compartment door, and door opening force. (A) is a graph which shows the relationship between the angular velocity of the preferable refrigerator compartment door at the time of opening a refrigerator compartment door, and opening time, (b) is a graph which shows the relationship between the opening angle of refrigerator compartment door, and opening time. It is. (A) to (f) is an operation explanatory view of the rotating plate and the connecting plate in the door opening device. (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 left refrigerator compartment door, (b) is when protruding a 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 the right 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 contact | abuts to the planar contact surface of a refrigerator compartment door. (A) And (b) is operation | movement explanatory drawing when a protrusion member contact | abuts to the contact surface which consists of the surrounding surface of the semicircle column of a refrigerator 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) to (f) is an operation explanatory view of a rotating plate and a connecting plate according to 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.
First, before describing the door opening device according to the embodiment of the present invention, the overall configuration of a refrigerator including the door opening device according to the present embodiment will be described. The “refrigerator” corresponds to “apparatus provided with a door opening device” in the claims.

≪Overall configuration of refrigerator≫
FIG. 1 is a front view of a refrigerator in an embodiment of the present invention.
As shown in FIG. 1, the refrigerator 1 of the present embodiment includes, from above, a refrigerating room 2, ice making rooms 3 and upper freezing rooms 4 arranged side by side, a lower freezing room 5, and a vegetable room 6. doing. In addition, as an example, the refrigerator compartment 2 and the vegetable compartment 6 are storage rooms in a refrigerator temperature zone of about 3 to 5 ° C. Further, the ice making room 3, the upper freezer room 4, and the lower freezer room 5 are storage rooms in a freezing temperature zone of approximately −18 ° C.

  The refrigerating room 2 includes a so-called French-type refrigerating room door 2a and a refrigerating room door 2b which are divided into left and right sides and have a double door opening on the front side (front side in FIG. 1). The refrigerator compartment doors 2a and 2b rotate around the hinges 17a and 17b. In order to close the gap between the left and right refrigerating room doors 2a and 2b, a rotation threshold 18 is provided along the side of the refrigerating room door 2a close to the refrigerating room door 2b. The configuration will be described in detail later.

  The ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 include a drawer type ice making room door 3a, an upper freezing room door 4a, a lower freezing room door 5a, and a vegetable room door 6a, respectively. . In the following description, left and right refrigerator compartment doors 2a and 2b, ice making compartment door 3a, upper freezer compartment door 4a, lower freezer compartment door 5a, and vegetable compartment door 6a are simply door 2a, door 2b, door, respectively. 3a, door 4a, door 5a, and door 6a.

The refrigerator 1 includes a door sensor (not shown) that detects the open / closed states of the doors 2a, 2b, 3a, 4a, 5a, and 6a, and these doors 2a, 2b, 3a, 4a, and 5a. , An alarm (not shown) for notifying the user when a state in which it is determined that at least one of the doors 6a is open continues for a predetermined time (for example, 1 minute or more), and a refrigerator compartment 2. A temperature setting device (control panel 40 shown in FIG. 1 including a predetermined operation unit, a display unit, etc.) for setting the temperature of the upper freezing chamber 4, the lower freezing chamber 5, and the like are provided.
The refrigerator door 2a is provided with a left opening switch 48a, and the refrigerator door 2b is provided with a right opening switch 48b.

FIG. 2 is a side sectional view schematically showing the AA section of FIG. 1.
As shown in FIG. 2, the outside of the refrigerator 1 and the inside of the refrigerator 1 are separated by a heat insulating box 10 formed by filling a foam heat insulating material (foamed polyurethane) between the inner box 10a and the outer box 10b. ing. Moreover, the heat insulation box 10 of the refrigerator 1 is mounted with a plurality of vacuum heat insulating materials 14.

  In the warehouse, a plurality of storage chambers arranged in different vertical directions in different temperature zones are adiabatically partitioned by heat insulating partition walls 11a and 11b. That is, the upper heat insulating partition wall 11a separates the refrigerating room 2 that is a refrigerating temperature zone storage room from the upper freezing room 4 and the ice making room 3 (see FIG. 1) that are refrigerating temperature zone storage rooms. . Further, the lower heat-insulating partition wall 11b separates the lower freezing room 5 that is a storage room in the freezing temperature zone and the vegetable room 6 that is a storage room in the refrigerating temperature zone.

  A plurality of door pockets 13 are provided on the inner side of the doors 2a and 2b. The refrigerator compartment 2 is partitioned into a plurality of storage spaces in the vertical direction by a plurality of shelves 12.

  In the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6, storage containers 4b, 5b, 6b are respectively provided behind the doors 4a, 5a, 6a provided in front of the respective storage compartments. The storage containers 4b, 5b, and 6b can be pulled out by placing a hand on a handle portion (not shown) of the doors 4a, 5a, and 6a and pulling it out toward the front side. Similarly, in the ice making chamber 3 shown in FIG. 1, a storage container (indicated by reference numeral 3b in FIG. 2) is provided behind the door 3a, and the handle 3 (not shown) of the door 3a is put on a hand and pulled out to the front side. Thus, the storage container 3b can be pulled out.

  As shown in FIG. 2, the doors 2a, 2b, 3a, 4a, 5a, and 6a are provided with door packings 15 around the doors 2a, 2b, 3a, 4a, 5a, and 6a. The inside of the storage space (the refrigerator compartment 2, the ice making compartment 3, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6) is closed and sealed by closely adhering to the peripheral edge of the front opening of the refrigerator 1. This prevents the leakage of cold air from the storage space.

  As shown in FIG. 2, the cooler 7 is disposed in a cooler storage chamber 8 provided substantially at the back of the lower freezing chamber 5. The cooler 7 is configured by attaching a large number of fins (not shown) to the cooler pipe 7d so that heat can be exchanged between the refrigerant and the air in the cooler pipe 7d.

  Above the cooler 7, an internal fan 9 (for example, a motor-driven fan) is provided. The air cooled by heat exchange in the cooler 7 (hereinafter, this cooled low-temperature air is referred to as “cold air”) is blown into the refrigerator compartment air duct 22, the vegetable compartment air duct 25, and the ice making room by the internal fan 9. Via the duct 26a, the upper freezer compartment air duct 26b, and the lower freezer compartment air duct 27, it is sent to the storage rooms of the refrigerator compartment 2, the vegetable compartment 6, the ice making room 3, the upper freezer compartment 4, and the lower freezer compartment 5. It has become.

FIG. 3 is a front view illustrating the configuration inside the refrigerator.
As shown in FIG. 3, each air duct to the refrigerator compartment 2, the ice making room 3, the upper freezer room 4, the lower freezer room 5 and the vegetable room 6 is shown in FIG. 3 as each storage room of the refrigerator 1. Is provided on the back side.
The storage room to which the cool air from the cooler 7 is sent is controlled by the refrigerating temperature zone cool air control means 20 and the freezing temperature zone room cool air control means 21.

  Here, the refrigeration temperature zone cold air control means 20 is a so-called twin damper having two independent openings, and the first opening 20a controls the air flow to the cold room air duct 22, and the second opening 20b. Controls the air flow to the vegetable room air duct 25. The freezing temperature zone cold air control means 21 is a single damper having a single opening, and is an ice making room air duct 26a (see FIG. 2), an upper freezer room air duct 26b (see FIG. 2), and a lower freezer room. The ventilation to the ventilation duct 27 (refer FIG. 2) is controlled.

  Specifically, when the first opening 20 a of the refrigeration temperature zone room cool air control means 20 is in the open state, the cool air is sent to the refrigerating room 2 through the refrigerating room upstream duct 23 (described later) and the refrigerating room air duct 22. . That is, the cold air is sent to the refrigerator compartment 2 from a plurality of outlets 2 c provided along the extending direction of the refrigerator compartment air duct 22. The cold air that has cooled the refrigerator compartment 2 flows from the return port 2d provided in the lower portion of the refrigerator compartment 2 through the refrigerator compartment return duct 24 into the cooler compartment 8 from the lower side portion of the cooler compartment 8. The heat exchange with the cooler 7 is performed.

  When the second opening 20b of the refrigeration temperature zone room cool air control means 20 is in the open state, the cool air passes through the refrigerating room upstream duct 23 (see FIG. 4) and the vegetable room air duct 25, which will be described later, from the outlet 6c to the vegetable room. 6 is sent. The cold air that has cooled the vegetable compartment 6 flows into the cooler housing chamber 8 from the lower part of the cooler housing chamber 8 through the return port 6d (see FIG. 2), and exchanges heat with the cooler 7. Yes. Incidentally, the amount of air circulating through the vegetable compartment 6 is smaller than the amount of air circulating through the refrigerator compartment 2 and the amount of air circulating through the freezing temperature zone cold air control means 21.

  When the freezing temperature zone cold air control means 21 is in the open state, the cold air passes through the ice making room air duct 26a (see FIG. 2) and the upper freezer room air duct 26b (see FIG. 2) from the outlets 3c and 4c. 3 and the upper freezer compartment 4. Further, the cold air is sent to the lower freezer compartment 5 from the outlet 5c through the lower freezer compartment air duct 27 (see FIG. 2). Thus, the freezing temperature zone chamber cool air control means 21 is attached above the blower cover 31 (see FIG. 4), which will be described later, to facilitate air blowing to the ice making chamber 3.

  The cold air blown into the ice making chamber 3 through the ice making chamber blow duct 26a (see FIG. 2) and the upper stage freezing chamber 4 were blown through the upper freezer compartment blow duct 26b (see FIG. 2). The cold air descends to the lower freezer compartment 5. Then, this cold air, together with the cold air blown into the lower freezer compartment 5 through the lower freezer compartment air duct 27, is sent to a freezer compartment return port 28 (see FIG. 2), which will be described later, provided in the lower part of the lower freezer compartment 5. Then, it flows into the cooler storage chamber 8 and exchanges heat with the cooler 7.

  The cold air that has cooled the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5 returns to the cooler storage chamber 8 through a freezing chamber return port 28 provided in the lower part of the lower freezing chamber 5. Incidentally, the horizontal width dimension of the freezer return port 28 is substantially equal to the left and right width dimensions of the cooler 7.

FIG. 4 is an enlarged explanatory view of the main part of FIG.
As shown in FIG. 4, the freezing temperature zone back partition 29 in which the air outlets 3 c, 4 c, 5 c are formed includes the upper freezing chamber 4, the ice making chamber 3, the lower freezing chamber 5, and the cooler storage chamber 8. Divide the space.
The blower support part 30 to which the internal blower 9 is attached partitions the cooler storage chamber 8 and the freezing temperature zone back partition 29.

  The blower cover 31 is disposed so as to cover the front surface of the internal fan 9. Between the blower cover 31 and the freezing temperature zone back partition 29, the ice making chamber blow duct 26a and the upper freezer compartment blow duct for guiding the cool air blown by the internal blower 9 to the outlets 3c, 4c and 5c. 26b and a lower freezer compartment air duct 27 are formed. Further, an air outlet 31a is formed in the upper part of the blower cover 31, and a refrigerating temperature zone cold air control means 21 is provided at the air outlet 31a.

The blower cover 31 also plays a role of blowing the cold air blown by the internal fan 9 toward the refrigeration temperature zone cold air control means 20 side. That is, the cold air that does not flow to the refrigeration temperature zone cold air control means 21 side provided in the blower cover 31 is guided to the refrigeration temperature zone cold air control means 20 side via the cold room upstream duct 23.
The blower cover 31 includes a rectifying unit 31 b on the front surface of the internal fan 9. The rectifying unit 31b rectifies the turbulent flow caused by the cold air blown out to prevent noise generation.

  Further, when the refrigeration temperature zone cool air control means 20 and the refrigeration temperature zone cool air control means 21 are in the open state, most of the cool air is sent to the refrigeration temperature zone cool air control means 21 side, and the other cold air remains. The air ducts 26a, 26b, and 27 are configured so as to be guided to the refrigeration temperature zone cold air control means 20 side. Accordingly, one cooler is provided for the freezing temperature zone (ice-making chamber 3, upper freezing chamber 4 and lower freezing chamber 5) and the refrigerating temperature zone (refrigeration chamber 2 and vegetable room 6) which are storage rooms having different temperature zones. 7 can supply cold air.

  As described above, switching of the cool air to be blown to each storage chamber of the refrigerator 1 can be performed by appropriately opening / closing the refrigeration temperature zone cool air control means 20 and the freezing temperature zone cool air control means 21. It is like that.

Below the cooler 7, a defrost heater 35 that is a defrosting means is installed, and above the defrost heater 35, in order to prevent defrost water from dripping onto the defrost heater 35, An upper cover 36 is provided.
The defrost water generated by the defrosting (melting) of the frost attached to the wall of the cooler 7 and the surrounding cooler storage chamber 8 flows into the gutter 32 provided at the lower part of the cooler storage chamber 8. It reaches the evaporating dish 34 disposed in the machine room 50 through the drain pipe 33 and is evaporated by the heat of the compressor 51 (see FIG. 3) and the condenser 52 (see FIG. 3) which will be described next, and is outside the refrigerator. It is supposed to be discharged.

As shown in FIG. 3, a machine room 50 is provided on the lower back side of the heat insulating box 10. In the machine room 50, a compressor 51 that compresses and discharges the refrigerant, a condenser 52 that exchanges heat between the refrigerant and air, an external fan 53 that promotes heat exchange between the refrigerant and air in the condenser 52, A decompression means 54, which is a thin tube, is arranged.
The compressor 51, the condenser 52, and the decompression means 54 are connected to the cooler 7 (evaporator) by piping, and a refrigerant path (refrigerant circuit) through which the refrigerant flows is formed.

  As shown in FIG. 2, on the upper surface side of the ceiling wall of the refrigerator 1, a control board 41, which is a control unit on which a CPU, a memory such as a ROM or a RAM, an interface circuit, and the like are mounted as a control unit. The refrigerator 1 includes a refrigerator temperature sensor 44 that detects the temperature of the refrigerator compartment 2, a vegetable compartment temperature sensor 45 that detects the temperature of the vegetable compartment 6, a freezing temperature zone (the ice making chamber 3, the upper freezer compartment 4, and the lower freezer compartment). Temperature sensors such as a freezer temperature sensor 46 that detects the temperature of 5) and a cooler temperature sensor 47 that detects the temperature of the cooler 7 are provided, and the detected temperature is input to the control board 41. .

  The control board 41 includes a door sensor (not shown) that detects the open / closed state of the doors 2a, 2b, 3a, 4a, 5a, and 6a, and the control panel 40 (see FIG. 1) provided on the door 2a. The left door opening switch 48a (see FIG. 1) provided on the doors 2a and 2b is connected to the right door opening switch 48b (see FIG. 1).

  The control board 41 individually drives the ON / OFF of the compressor 51 and the control of the rotational speed, the refrigeration temperature zone cool air control means 20 and the refrigeration temperature zone cool air control means 21 by the program previously installed in the ROM. Control of each drive motor (not shown), ON / OFF of the internal fan 9 and control of the rotational speed, ON / OFF control of the external fan 53 (see FIG. 3), control of the rotational speed, etc., and the door open state The operation of the entire refrigerator can be controlled by controlling ON / OFF of an alarm (not shown) to be notified, the operation of the door opening device 60, and the like.

As shown in FIG. 2, a door opening device 60 is provided adjacent to the front surface of the upper surface of the ceiling wall of the refrigerator 1, that is, the doors 2 a and 2 b.
FIG. 5 is a plan view of the refrigerator as viewed from the direction B of FIG.
As shown in FIG. 5, the opening device 60 includes projecting members 61a and 61b corresponding to the door 2a and the door 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 by pushing the vicinity of the upper ends of the refrigerator compartment doors 2a and 2b.
The door 2a corresponds to a “first door” in the claims, and the door 2b corresponds to a “second door” in the claims.
The door opening device 60 will be described in more detail later.

In the present embodiment, a rotation threshold 18 is provided on the left door 2a.
The rotation threshold 18 is pivotally supported around a rotation threshold fulcrum 19 provided on the door 2a. When the door 2a is closed, the rotation threshold 18 is positioned parallel to the door 2a and closes the gap between the door 2a and the right door 2b.
When the user opens the door 2a, the rotation threshold 18 rotates around the rotation threshold fulcrum 19 to a position substantially orthogonal to the door 2a by the action of a cam (not shown). The rotation threshold 18 opens without interfering with the door 2b.

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 _θdmax 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 opening angle θ _dmax of the refrigerator compartment door 2a when the protruding member 61a protrudes most is θ _dmax = arctan (Maximum protruding amount H2 / distance Rda), which is determined by the protruding amount of the protruding member 61a of the door opening device 60 and the distance from the hinge 17a.

Next, a preferable angle of the operation opening angle θ _dmax will be described.
First, a closer as a closing means provided in each of the doors 2a and 2b will be described.

  The refrigerator 1 includes a closer that prevents a so-called half-door by energizing the doors 2a and 2b in a closing direction before the doors 2a and 2b are completely closed. As will be described below, this closer, when the doors 2a and 2b are closed, temporarily deforms a resin leaf spring member to accumulate elastic strain energy, and in the direction to close the doors 2a and 2b by the accumulated energy. It has a configuration to be energized. Since these closers have the same structure except that the left and right doors 2a and 2b are symmetrical to each other, 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.

FIGS. 6A to 6C are operation explanatory views of the refrigerator closer, and are views showing the door viewed from the lower side of the refrigerator.
As shown in FIGS. 6A to 6C, the closer 37 is provided at the lower end of the hinge 17a of the door 2a. A fixed closer bracket 38a is attached to the refrigerator 1, and a cam portion 38b formed in a smooth curved surface is provided at a part thereof.
The door 2a is provided with a closer elastic body 39a having a deformed portion 39b made of an elastic material such as resin.

As shown in FIG. 6 (a), when the door 2a rotates counterclockwise CCW around the hinge 17a and is closed to the angle ψ1, the deformed portion 39b of the closer elastic body 39a becomes the cam portion 38b of the closer bracket 38a. To touch. And the deformation | transformation part 39b of the closer elastic body 39a bends in response to the reaction force of the arrow Fa direction.
This force acts in the clockwise direction with respect to the hinge 17a of the door 2a, that is, the direction in which the door 2a is opened, so that the user feels that the reaction force from the door 2a being closed becomes heavier from the middle.

  As shown in FIG. 6B, when the door 2a is closed and the opening angle becomes ψ2, and the contact point between the closer elastic body 39a and the cam portion 38b is collinear with the hinge 17a of the door 2a (positioned at the neutral point). Then, the force Fb between the closer elastic body 39a and the cam portion 38b is directed toward the rotation fulcrum, so that the moment becomes zero. Therefore, the door 2a balances and does not receive any force of opening and closing.

The closer elastic body 39a bends and accumulates elastic strain energy until the contact point between the closer elastic body 39a and the cam portion 38b reaches the neutral point.
Next, as shown in FIG. 6C, when the door 2a is further closed even if the contact point between the closer elastic body 39a and the cam portion 38b passes the neutral point, the closer elastic body 39a has an arrow from the cam portion 38b. A force in the Fc direction is applied. This force forms a moment in the direction of closing the door 2a (counterclockwise CCW in this figure) with respect to the pivot point of the door 2a, so that the door 2a is closed by this moment and biased in the direction. Become.

According to such a closer 37, the door 2a is closed when the open angle, which is a neutral point, is less than ψ2. Therefore, it is desirable that the angle θ _d that opens the door 2 a by the door opening device 60 is larger than φ 2 (θ _d > φ 2). That is, if the opening angle is in the relationship of θ _d > ψ2, the door 2a opened by the door opening device 60 is not urged by the closer 37 in the closing direction. Incidentally, in the refrigerator 1 of the present embodiment, the opening angle of the door 2a is, for example, if it is about .psi.2 = 10 °, open angle theta _d of the door 2a by door opening device 60 is about 20 ° from 15 ° It is desirable to set. Further, if the opening angle θ _d is set to be larger than ψ1 (θ _d > ψ1) so that the cam portion 38b and the deforming portion 39ba do not act, the door opening operation by the door opening device 60 is further ensured. It is more desirable because it is done. As for the right door 2b, like the door 2a, than the angle open angle theta _d by the door opening device 60 acts in closer 37 large (theta _d> .psi.2, preferably θ _d> ψ1) to be Is preferred.

≪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 are the same as the front, rear, up, down, left and right of the refrigerator 1 (see FIGS. 2 and 3) to which the door opening device 60 is attached. Based on left and right directions.

  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”. .

  The intermittent drive gear 78a corresponds to a “first intermittent drive gear” in the claims, and the intermittent drive gear 78b corresponds to a “second intermittent drive gear” in the claims. The projecting member 61a corresponds to a “first projecting member” in the claims, and the projecting member 61b corresponds to a “second projecting member” in the claims.

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

<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). The third small gear 88 b (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, when the teeth of the worm gear 84 are left-handed spirals that are opposite to general screws, 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.

  Around the intermittent drive gears 78a and 78b, there are 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 (FIG. 10) that partially protrude on the outer peripheral side. Reference) 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. 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 intermittent drive gears 78a and 78b can be rotated by the stopper end 80A entering the notch 76D that is recessed from the sliding surface 76C. Become. 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.
The range of the angle θ0 at which the teeth 76A of the large gear 76 and the teeth 79a and 79b of the intermittent drive gears 78a and 78b mesh with each other is “first angle range” and “second angle range” in the claims. It corresponds to. That is, the intermittent drive gear 78a rotates (rotates) meshing with the large gear 76 only in the “first angle range”, and rotates (rotates) without meshing with the large gear 76 except in the “first angle range”. do not do. The intermittent drive gear 78b rotates (rotates) meshing with the large gear 76 only in the “second angle range”, and rotates (rotates) without meshing with the large gear 76 except in the “second angle range”. do not do.
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, teeth 102a to 102q (total number of teeth 14) meshing with teeth 101A to 101P (total number of teeth 13) of the connecting plate 65a are formed around the rotating plate 73a.

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 is introduced into 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.

FIG. 14 is a DD cross section of FIG.
As a method of attaching the door opening device 60 to the refrigerator 1 through the main body attachment hole 59, as shown in FIG. 14, a case 62 and a cover 69 are sandwiched via rubber bushes 58 and protruded from the upper surface of the refrigerator 1. There is a method of tightening the boss 57 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 96Ab 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 96Ab 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 96Ab of the switch lever 96a contacts 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 are displaced in a direction away from the detection switches 95a and 95b, so that both the detection switches 95a and 95b are turned off.

  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 (refer to FIG. 5A) at the origin position have a first peripheral surface 99a (OFF surface) of the cam portion 99 at two points with an angle φ1 about the large gear central shaft 77. ).

  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. 17 (a) to 17 (f), 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. 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”). At this time, if energization of the motor 82 is stopped, the motor 82 stops while decelerating.

  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).

  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. As a result, the intermittent drive gear 78b and the switch levers 96a and 96b perform a symmetrical operation (mirror image) from FIGS. 17A to 17F. 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 part 99, and the rightward movement in the figure is counterclockwise (CCW direction). It is drawn to be equivalent to rotation.
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.
Further, the states shown in FIGS. 18A to 18F and the states shown in FIGS. 19A to 19F are the states shown in FIGS. 17A to 17F. It corresponds.

  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). The state immediately before completion is shown, and the door opening operation is almost completed. Since the detection switch 95a is turned from OFF to ON, the power supply to the motor 82 is cut off and stopped. 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. 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, and the door opening operation is almost completed. Since the detection switch 95a is turned from OFF to ON, the motor 82 is turned off and stopped. 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. 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)). Incidentally, if the detection switch 95a is turned from OFF to ON, it can be confirmed that the opening operation of the left door 2a is almost completed, so that the energization to the motor 82 is stopped.

When energization of the motor 82 is stopped in the above state (see FIG. 24), the motor 82 stops while decelerating. Until the motor 82 stops, the large gear 76 and the cam portion 99 continue to rotate.
As shown in FIG. 25, the large gear 76 and the cam portion 99 are in the “origin position” (from the time when the motor 82 stops until the motor 82 stops in the above state (see FIG. 24). Rotate clockwise from 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)).

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)). By the way, if the detection switch 95b is turned from OFF to ON, it can be confirmed that the opening operation of the right door 2b is almost completed, and the energization to the motor 82 is stopped.

When the energization of the motor 82 is stopped in the above state (see FIG. 29), the motor 82 stops while decelerating. Until the motor 82 stops, the large gear 76 and the cam portion 99 continue to rotate.
As shown in FIG. 30, the large gear 76 and the cam portion 99 are in the “origin position” (from the time when the motor 82 stops until the motor 82 is stopped in the above state (see FIG. 29). It rotates counterclockwise from 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)).

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 left and right refrigerator compartment door 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 switch 48a (see FIG. 1), 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, and the door 2a rotates clockwise (CW direction) to 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 continues to open with inertia. At this time, since there is a friction torque between the hinge 17a and the door 2a, the door 2a opens while gradually decelerating. On the other hand, the motor 82 of the door opening device 60 rotates in the reverse direction, and the protruding member 61a is retracted.

  Next, as shown in FIG. 31D, when the user operates the right door switch 48b (see FIG. 1) 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 continues to open with inertia. At this time, since there is a friction torque between the hinge 17b and the door 2b, the door 2b opens while gradually decelerating. On the other hand, the motor 82 of the door opening device 60 rotates in the forward rotation direction, and the protruding member 61b is retracted.

  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 refrigerator compartment door is opened.
As shown in FIG. 32, the horizontal axis of the graph is the opening angle of the doors 2a and 2b, θ _d = 0 is a state in which the doors 2a and 2b are closed, and θ _dmax is the maximum opening angle. This θ _dmax (maximum opening angle) represents, for example, an opening angle when the doors 2a and 2b are in contact with a stopper (not shown), a wall surface (not shown) near the installation location of the refrigerator 1, or the like. θ1 is an angle ψ2 (see FIG. 6B) at which the closer 37 (see FIG. 6) generates a closing force on the doors 2a and 2b. θ2 is an angle at which the doors 2a and 2b are pushed open by the protruding members 61a and 61b of the door opening device 60.

  The vertical axis of the graph represents the door opening force of the doors 2a and 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. 2) 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. 2) so that no gap is generated. As a result, in order to open the doors 2a and 2b, in addition to the closer load, a door opening force (magnet 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 opening force (magnet load) for peeling off is large when the doors 2a and 2b start to open, and even if they are slightly opened, the magnet's attracting force (magnetic force) decreases rapidly, so the opening force decreases rapidly. Become.

  Further, since the left door 2a is provided with the rotation threshold 18, when the door 2a is opened, a door opening force (rotation threshold load) for rotating the rotation threshold 18 around the rotation threshold fulcrum 19 is generated. Add more. That is, the left door 2a has a larger opening force at the beginning of opening than the right door 2b.

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 the maximum at θ _d = 0 at the beginning of opening, decreases sharply to θ ₁ that is the closer range, and is substantially uniform up to θ _dmax that is the maximum opening angle. Friction torque is generated.

  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 increases linearly 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 protruding operation of the protruding members 61a and 61b is performed at a low speed at the beginning of the protrusion and gradually increased so that the maximum speed can be obtained just before the end of the protrusion. 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. 33 (a) is a graph showing the relationship between the preferred angular speed of the refrigerator compartment door and the opening time when the refrigerator compartment 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 refrigerator compartment door and the opening time. The horizontal axis indicates time, and the vertical axis indicates the opening angle of the doors 2a and 2b.

  As shown in FIG. 33A, the doors 2a and 2b are closed at time t = 0. After the time delay from t = 0 to t1, when the door opening device 60 is operated by energizing the door opening device 60 at t = t1, the projecting members 61a and 61b are moved from t = t1 to t2. , Projecting in the direction of the doors 2a, 2b. 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 ω _dmax is reached 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. During the period from t = t2 to t = t3, the doors 2a and 2b are in the inertia range in which the doors are kept open by inertia.

  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 inertia range operation. During the inertia range, the doors 2a and 2b receive frictional resistance from the hinges 17a and 17b, so that the doors 2a and 2b continue to open due to inertia 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 are opened by inertia, the vehicle is decelerated by a constant friction torque, so that the angular velocity between the inertia ranges decreases uniformly with time, and the graph becomes a straight line with a lower right. From t = t2 to t = t3 until the doors 2a, 2b come to contact with the stopper or the like at t = t3, the motion is constant acceleration in the negative direction.
If the friction coefficient at the hinges 17a and 17b is negligibly small, the angular velocity does not decrease in the deceleration range, so the angular velocity remains constant at the maximum angular velocity _ωdmax as shown by the broken line.

In the graph of angular displacement shown in FIG. 33 (b), in the acceleration range, from the time t = t1 to t2, the door 2a, the open angle theta _d of 2b, increases quadratically as a convex downward. Further, in the coasting range from time t2 to t3, the opening angle theta _d of the door 2a, 2b increases quadratically as a convex upward. Then, open angle theta _d of the door 2a, 2b is greatest open angle theta _dmax at t = t3. The downwardly convex quadratic curve and the upwardly convex quadratic curve are continuous. Here, if θ _dmax is set to an angle of 90 ° or more, the doors 2a and 2b are sufficiently opened to take in and out food, which is easy to use and suitable.

Next, a preferable opening operation time when the refrigerator doors 2a and 2b are opened by the door opening device 60 will be described.
In general, the reflection time of a person is 0.4 to 0.5 seconds. This is because, for example, when driving a car, when the danger is detected and it is determined that the brake is necessary, the foot from the accelerator pedal is removed. Known as the time to move.

Since a person cannot react when an unforeseen phenomenon occurs in a shorter time than the reflection time, such a phenomenon is too fast and feels abrupt and uncomfortable. Therefore, when the doors 2a and 2b are opened using the door opening device 60, the left door switch 48a or the right door switch 48b is operated, and then the door 2a or the door 2b starts to open to the maximum speed or maximum. If the operation time t2 until reaching the angular velocity ω _dmax is set to 0.4 seconds or more, the user can react to the operation in which the doors 2a and 2b are opened to the front. I don't feel abrupt and feel 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 0.4 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. Then, 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 0.3 seconds or more. It is desirable to set.

On the other hand, if the operation time t2 is excessive, the door opening operation seems to be unnaturally slow, so that the operation time t2 is 0.8 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 to the maximum angular speed _ωdmax is 0.3. It is preferable to set it to 2 seconds or more and 0.7 seconds 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 and 2b start to open until reaching the maximum speed or the maximum angular speed is set to 0.3 seconds or more and 0.7 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 are moved by the rotating operation of the rotating plates 73a and 73b to open the doors 2a and 2b 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.

  34A to 34F are operation explanatory views of the rotating plate and the connecting plate in the door opening device. 34 (a) to (f), reference numerals ra to rq denote teeth 101A to 101P provided on the connecting plate 65a of the connecting plate 65a and teeth 102a to 102q provided on the rotating plate 73a. And the meshing pitch circle radius.

  As shown in FIG. 34A, 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. 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 meshing from 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). And 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. 35 (a) (time until the state shown in FIG. 34 (a)) is the tangential speed of the portion of the pitch circle radius ra.
Va = ω × ra = (N / 60) × 2π × ra (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.
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. 36 (a) is an explanatory diagram showing the relationship between the speed of the protruding member and the speed of the end of the left refrigerator door when the left protruding member is protruded, and FIG. 36 (b) is the right protruding. It is explanatory drawing which shows the relationship between the speed of a protrusion member at the time of protruding a member, and the speed of the edge part of the right side 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, a rotation threshold 18 is provided on the door 2a shown in FIGS. Therefore, when the door 2a is opened, a rotational load (see FIG. 32) is added, so that the door opening force is larger than that when the 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 0.3 seconds or more and 0.7 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 this 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 0.3 seconds or more and 0.7 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 0.3 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 0.3 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 0.3 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 0.3 second or more and 0.7 second or less, regardless of the amount of food stored in the door pockets 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, the protrusion operation time T is set to 0.3 seconds or more, so that 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 a control panel 40 that includes an operation means 43a such as a push button switch for adjusting temperature and a display means 43b such as an LED.

  The control board 41 includes temperature sensors 44, 45, 46, 47, a cold air control means including a refrigeration temperature zone cold air control means 20 and a freezing temperature zone cold air control means 21, a compressor 51, a door opening device 60, and The door sensor 49 is also connected and configured to drive and control the door sensor 49. As described above, the control panel 40 is disposed on the front surface of the door 2a. Thereby, when a user changes or confirms various functions, the usability is good.

  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.
The control panel 40 is provided with notifying means for notifying the user that the door is in a half-door state. Examples of the notification means include a buzzer and a lamp.

<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 temperature sensors 44, 45, 46 and 47, and the door sensor 49, and starts 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 rotation 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 has been 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 passed. 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 OFF / ON, 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 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.

After confirming that the left protruding member 61a has completed the protruding operation (step S127), the control unit reverses the polarity of the voltage applied to the motor 82 and rotates the motor 82 in the reverse direction (step S128). Then, the process proceeds to next Step S129.
In step S129, the control unit monitors whether the detection switch 95a is turned from ON to OFF. Then, when it is turned off (Yes in step S129), the state shown in FIG. 20 (2) is established, so that it is confirmed that the drawing operation is being performed, and the process proceeds to the next step S130. In addition, when the detection switch 95a is not OFF (No in step S129), the control unit repeats step S129.

In step S130, the control unit monitors whether or not the detection switch 95b is turned from ON to OFF. Then, when turned off (Yes in step S130), the state shown in FIG. 20 (3) is entered, and the process proceeds to step S131. In addition, when the detection switch 95b is not OFF (No in Step S130), the control unit repeats Step S130.
In step S131, 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 S132), 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 is not turned on (No in step S224), 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 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.

After confirming that the right protruding member 61b has completed the protruding operation (step S227), the control unit reverses the polarity of the voltage applied to the motor 82 and rotates the motor 82 in the forward direction (step S227). S228), the process proceeds to the next step S229.
In step S229, the control unit monitors whether the detection switch 95b is turned from ON to OFF. Then, when it is turned off (Yes in step S229), the state shown in FIG. 20 (4) is reached, so that it is confirmed that the drawing 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 S229), the control unit repeats Step S229.

In step S230, the control unit monitors whether the detection switch 95a is turned from ON to OFF. Then, when turned off (Yes in step S230), the state shown in FIG. 20 (3) is entered, and the process proceeds to step S231. In addition, when the detection switch 95a is not OFF (No in Step S230), the control unit repeats Step S230.
In step S231, 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 S232), 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, when the motor 82 is decelerated at t = te and stopped at t = tf, the projecting member 61a is projected at the maximum projecting 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, when the motor 82 is decelerated at t = te and stopped at t = tf, the protruding member 61b protrudes with 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 this embodiment, it is possible to open two doors 2a and 2b of a double door type electrically, and the way of opening the doors 2a and 2b is smooth and there is no sudden feeling. Moreover, there is little difference in the opening time due to the large amount of food stored inside the doors 2a and 2b, and the door opening operation can be performed stably.

  In addition, according to the present embodiment, the door opening device 60 protrudes from the start of the door opening operation until the maximum speed is reached, regardless of the amount of food stored inside the doors 2a and 2b. The operating time T can be set to 0.3 seconds or more and 0.7 seconds or less. As a result, the door opening operation is not too fast and felt suddenly, and the door opening operation is not too slow, so that the door opening operation is appropriate and natural.

  Further, according to the present embodiment, even when the doors 2a and 2b are lightweight, the protruding operation time T after detecting the operation of the left door switch 48a and the right door switch 48b by the user is It will not be less than 0.3 seconds. Thereby, the acceleration at the time of door opening operation is small, and an impact force is not applied to the food stored in the door pocket 13.

Moreover, according to this embodiment, the left door 2a and the right door 2b can be opened corresponding to the rotation direction of the rotation direction of one motor 82.
Specifically, the motor 82 is rotated in the forward rotation direction to rotate the large gear 76 and the left intermittent drive gear 78a, thereby causing the left protruding member 61a (first protruding member) to protrude to the left side. The door 2a can be opened.

  Further, the motor 82 is rotated in the reverse direction to rotate the large gear 76 and the right intermittent drive gear 78b, thereby projecting the right projecting member 61b (second projecting member) and opening the right door 2b. be able to.

  Further, according to the present embodiment, the opening angle of the doors 2a, 2b by the opening device 60 is set to be larger than the angle at which the closer that applies force in the closing direction of the doors 2a, 2b functions. The door opening operation by the door opening device 60 can be performed reliably.

  Further, according to the present embodiment, by rotating the motor 82 at a constant rotational speed, the projecting members 61a and 61b can be caused to project by performing a motion that approximates a uniform acceleration motion. Therefore, according to the present embodiment, a natural impression opening operation can be performed with a simple and inexpensive configuration without requiring special speed control of the motor 82.

  In addition, according to the present embodiment, the maximum tangential speed of the door end farthest from the hinges 17a and 17b of the doors 2a and 2b is set to be 700 to 1100 mm / sec. An appropriate opening operation can be realized.

  Further, according to the present embodiment, since the protruding member 61 operates only in the protruding direction and does not move backward, a space for the protruding member 61 to move backward becomes unnecessary, and the size can be reduced.

  Further, according to the present embodiment, since one projecting member 61a is retreated, and then the other projecting member 61b is projected, the conventional retreat of one projecting member and the other projecting member Unlike the case where the protrusions are simultaneously performed, the load on the driving mechanism such as a motor is small. Therefore, according to this embodiment, the efficiency of the drive mechanism is high and energy is not wasted compared to the conventional one.

  Moreover, according to this embodiment, since the operation amount of the protruding members 61a and 61b can be increased within a limited space, the opening operation of the doors 2a and 2b is stabilized.

  Further, according to the present embodiment, the projection amounts of the projection members 61a and 61b are detected by the switch levers 96a and 96b associated with the cam portion 99 that rotates integrally with the large gear 76 and the detection switches 95a and 95b. Can do. Therefore, according to the present embodiment, it is possible to construct a switch that detects a certain protrusion amount with a simple configuration.

  Further, according to the present embodiment, when the projecting members 61a and 61b are drawn into the case 62, the thin portions 70 of the tip members 64a and 64b provided at the tips of the projecting members 61a and 61b are formed into the projecting member 61a. , 61b are inserted through the openings 63a, 63b of the case 62. Therefore, according to the present embodiment, it is possible to prevent water and dust from entering the case 62 from the outside. Further, since the tip members 64a and 64b are made of a flexible material, it is possible to reduce an impact when the projecting members 61a and 61b perform the projecting operation and come into contact with the doors 2a and 2b.

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.
Next, 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 refrigerator 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-cylindrical door of the refrigerator 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 projecting member 61a, the projecting output P is orthogonal to the contact surface 93 and becomes a compressive force against the projecting 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 connection plate 65a of the connection plate 65a and teeth 202a to teeth 202q provided to the rotary 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 102b clockwise around the rotating plate center 74a in the plan view of FIG. Yes.
More specifically, as shown in FIGS. 48A to 48F, 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.

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). 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 of FIG. 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 low as V from the start of the projecting operation, but the first section from time t1 to t4 during which the maximum projecting output Pa is uniformly maintained, 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 3 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. In addition, since it is assumed that the door 2a in the present embodiment is provided with the rotation squeeze 18, an opening force for swinging the slewing squeeze 18 can be ensured, and the door opening operation is surely performed.

In the embodiment, the door opening device 60 that opens the doors 2a, 2b among the doors 2a, 2b, 3a, 4a, 5a, 6a of the refrigerator 1 has been described. The doors that are adjacent to each other on the left and right may be opened. In addition, these doors are not limited to double doors, and may be drawer type doors.
Moreover, in the said embodiment, although the refrigerator 1 was demonstrated as an example as an apparatus provided with the door opening apparatus 60, if this invention has a some door adjacent to each other, electrical equipment other than the refrigerator 1, furniture, etc. It may be.

  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.

1 Refrigerator 2a Cold room door (first door)
2b Cold room door (second door)
18 Rotating screw 37 Closer 40 Control panel 41 Control board 48a Left door switch 48b Right door switch 55a Waterproof rib 55b Waterproof rib 60 Opening device 61a Projecting member (first projecting member)
61b Projecting member (second projecting member)
64a tip member 64b tip member 65a connecting plate 65b connecting plate 73a rotating plate 73b rotating plate 76 large gear 78a intermittent driving gear (first intermittent driving gear)
78b intermittent drive gear (second intermittent drive gear)
82 Motor 83 Reduction gear train 95a Detection switch 95b Detection switch 96a Switch lever 96b Switch lever 96Ca Switch lever tip 96Cb Switch lever tip 97 Detection spring 99 Cam part 105 First range 106 Second range 107 Third range

Claims (4)

A motor capable of both forward and reverse rotation,
A reduction gear train that transmits the driving force of the motor while reducing the rotation of the motor;
A large gear capable of rotating both forward and reverse by transmitting the driving force of the motor via the reduction gear train;
A first intermittent drive gear that rotates in mesh with the large gear within a first angle range of the large gear, and that does not mesh with the large gear and does not rotate outside the first angle range;
A second intermittent drive gear that meshes with and rotates with the large gear in a second angle range of the large gear, and that does not mesh with the large gear and does not rotate outside the second angle range;
A driving force is transmitted from the first intermittent driving gear, and a first projecting member that pushes the first door open by projecting toward the first door;
A driving force transmitted from the second intermittent drive gear, a second projecting member that pushes the second door open by projecting toward the second door;
With
After the first projecting member or the second projecting member starts the projecting operation, a first section for maintaining the projecting speed and the projecting output at the start constant,
A second interval continuous with the first interval, wherein the protrusion speed increases with time, and the protrusion output decreases with time;
With
The first door or the second door is opened by performing the protrusion operation of the first protrusion member or the second protrusion member corresponding to the rotation direction of the motor. apparatus. The door opening device according to claim 1,
And operation time from the first projecting member has started the projecting operation until the projecting speed of said first projecting member is maximum speed,
And operation time from the second projection member has started the projecting operation until the projecting velocity of the second protruding member is maximum speed,
Are both 0.3 seconds or more and 0.7 seconds or less. The door opening device according to claim 1,
Each of the first door and the second door further comprises a closer for applying a rotational torque in the closing direction within a range of the first angle before the door is fully closed,
An opening device for opening the first door or the second door by the first projecting member or the second projecting member is larger than the first angle. The apparatus provided with the door opening apparatus of any one of Claims 1-3 .

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