JP2018025286A - Gear unit and cold air damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear unit capable of preventing or suppressing fracture of a rotation restricting portion for restricting a rotational angle range of a gear by being kept into contact with a contact portion disposed on the gear.SOLUTION: A gear unit 10 has a driving gear 36 to which driving force of a motor 31 is transmitted, a third supporting shaft 43 projecting from a bottom plate portion 25 of a case 8, and a rotation restricting mechanism 50 for defining an angular range of rotation of the driving gear 36 about an axis L1 of the supporting shaft 43. The rotation restricting mechanism 50 includes a wall surface part 54a (contact portion) disposed on the driving gear 36, and a rotation restricting portion 55 projecting from the bottom plate portion 25 of the case 8 and capable of being kept into contact with the wall surface part 54a from a front part in a rotating direction of the driving gear 36. The rotation restricting portion 55 includes a stopper portion 56 including a limit-stopping part 59a capable of being kept into contact with the wall surface part 54a, and a reinforcement portion 57 protruding from a side wall 560 of a stopper portion 56 at a root part of the stopper portion 56.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a gear unit including a rotation restricting portion that defines a rotation angle range of a gear, and a cold air damper including the gear unit.

  A cold air damper that opens and closes an opening part of a cold air passage of a refrigerator with a baffle is described in Patent Document 1. The cold air damper includes a frame including an opening through which cold air flows, a baffle for opening and closing the opening, and a gear unit. The gear unit includes a drive mechanism that drives the baffle and a case that houses the drive mechanism. The drive mechanism includes a motor and a train wheel for transmitting the rotation of the motor to the baffle. The train wheel includes a drive gear to which the driving force of the motor is transmitted and an output gear that meshes with the drive gear. The drive gear is rotatably supported on a support shaft protruding from the wall surface of the case. A baffle is connected to the output gear. The baffle rotates over a predetermined angular range between a closed position that closes the opening and an open position that opens the opening by driving the motor.

  The drive mechanism of Patent Document 1 includes a rotation restriction mechanism that defines a rotation angle range of the drive gear. The drive mechanism includes the rotation restricting mechanism, thereby preventing the baffle from rotating beyond a predetermined angle range. The rotation restricting mechanism includes an abutting portion provided on the drive gear and a rotation restricting portion that protrudes from the wall surface of the case and can abut against the abutting portion. The rotation of the gear is restricted when the contact portion contacts (collises) the rotation restricting portion. The wall surface of the case from which the support shaft and the rotation restricting portion protrude is a mounting surface on which the gear is mounted. In Patent Document 1, the drive gear is a toothless gear, and the output gear is a sector gear.

JP2015-209967A

  The rotation restricting portion of Patent Document 1 includes a contact portion at the tip portion of the rotation restricting portion that contacts the contact portion of the gear. Therefore, every time when the rotation of the gear is restricted, the contact portion of the gear and the rotation restricting portion collide with each other, and when stress is generated on the base end side of the rotation restricting portion (the boundary portion of the rotation restricting portion with the case wall) A crack or the like may occur on the base end side of the rotation restricting portion.

  The subject of this invention is providing the gear unit which can prevent or suppress that the rotation control part which contact | abuts the contact part provided in the gearwheel, and prescribes | regulates the rotation angle range of the said gearwheel is damaged. Moreover, it is providing the cold air damper provided with such a gear unit.

In order to solve the above problems, a gear unit of the present invention includes a support shaft that protrudes from a base portion of a support member, a gear that is rotatably supported by the support shaft, and that transmits a driving force from a drive source, A rotation restricting mechanism that defines an angle range in which the gear rotates about the axis of the support shaft, and the rotation restricting mechanism is in contact with the gear at a position spaced apart from the axis to the outer peripheral side. And a rotation restricting portion provided on the support member so as to be able to come into contact with the contact portion from the front in the rotation direction of the gear, and the rotation restricting portion is the same as the support shaft from the base portion A stopper portion having a contact portion that protrudes in the direction and can contact the contact portion on the tip side, and when viewed from the axial direction at the base portion of the stopper portion on the base portion side from the contact portion Side of the stopper A reinforcing portion comprising a portion projecting outward from the base, and the side surface of the reinforcing portion has an end opposite to the base portion continuous with the side wall of the stopper portion, and an end on the base portion side The base portion is continuous.

  In the present invention, the rotation restricting portion includes a stopper portion that includes a contact portion that protrudes from the base portion and can be brought into contact with the contact portion of the gear at the tip portion, and a reinforcing portion that protrudes outward from the stopper portion. Here, the end of the reinforcing part opposite to the base part is continuous with the side wall of the stopper part, and the end part of the base part side is continuous with the base part. Even when the contact part of the gear and the contact part of the stopper part collide and stress is frequently generated at the base end part (root part) of the stopper part, the rotation restricting part may be damaged by the reinforcing part. Occurrence can be prevented or suppressed. Moreover, since the reinforcement part is provided in the base part of the stopper part, a reinforcement part and the contact part of a gearwheel do not interfere.

  In the present invention, it is possible to adopt a mode in which the side surface of the reinforcing portion is a concave curved surface or a slope at an end opposite to the base portion. That is, it is possible to adopt a mode in which the side surface of the reinforcing portion is a curved line such as a concave arc or a diagonal line when the end opposite to the base portion is cut by a plane parallel to the axis of the support shaft. it can. According to this aspect, since the step portion does not occur between the end portion of the reinforcement portion opposite to the base portion and the side wall of the stopper portion, the stress is concentrated on the step portion and the stopper portion is damaged. Is unlikely to occur.

  In this invention, the aspect provided with the circumferential direction reinforcement part projected over the circumferential direction around the said axis line from the said side wall of the said stopper part as said reinforcement part is employable. Since the contact portion of the gear contacts the contact portion from the circumferential direction, a collision impact is likely to be applied to the stopper portion in the circumferential direction. Accordingly, if the circumferential reinforcing portion that protrudes in the circumferential direction from the stopper portion toward the contact portion side is provided as the reinforcing portion, the rotation restricting portion is damaged by the impact of the contact between the stopper portion and the contact portion. This can be further suppressed.

  In this case, it is desirable that the end of the circumferential reinforcing portion on the side opposite to the base portion smoothly continues to the side wall of the stopper portion. According to this aspect, the stress concentration on the boundary portion between the stopper portion and the circumferential reinforcing portion can be alleviated. Therefore, it is possible to prevent the rotation restricting portion from being damaged.

  In this invention, the aspect provided with the radial direction outer side reinforcement part protruded to the radial direction outer side spaced apart from the said spindle from the said side wall of the said stopper part as said reinforcement part is employable. When the abutting portion of the gear abuts against the contact portion, the impact component of the collision also acts in the radial direction of the stopper portion. Therefore, if the reinforcing portion is provided with a radially outer reinforcing portion that protrudes from the stopper portion to the radially outer peripheral side, the rotation restricting portion can be prevented from being damaged by the contact between the stopper portion and the contacting portion.

  In this case, it is desirable that the end portion on the opposite side to the base portion of the radially outer reinforcing portion smoothly continues to the side wall of the stopper portion. According to this aspect, the concentration of stress on the boundary portion between the stopper portion and the radially outer reinforcing portion can be reduced. Therefore, it is possible to prevent the rotation restricting portion from being damaged.

  In the present invention, it is preferable that the contact portion is a plane oriented in the circumferential direction around the axis. In this way, the rotation angle range of the gear can be accurately defined when the contact portion of the gear contacts the contact portion.

In the present invention, the reinforcing portion is disposed between the end portion on the opposite side to the base portion and the end portion on the base portion side, with the side face directed in a direction orthogonal to the axial direction from the base portion. The aspect provided with the bottom raising part protruded in the same direction as the said spindle can be employ | adopted. According to this aspect, since the reinforcing portion can be provided up to the tip side of the stopper portion, it is possible to prevent the rotation restricting portion from being damaged.

  In the present invention, the base portion includes a pedestal portion that protrudes stepwise in the same direction as the support shaft, and a part of which is a mounting surface on which the gear is mounted, and the support shaft and the stopper portion Can adopt a mode protruding from the pedestal portion.

  In this case, it is possible to adopt a mode in which at least a part of the reinforcing portion has an end portion on the base portion side that is continuous with the pedestal portion of the base portion.

  In this invention, you may employ | adopt the aspect by which the whole side surface is formed in the concave curved surface or the slope in the said reinforcement part. That is, when the entire side surface of the reinforcing portion is cut by a plane parallel to the axis of the support shaft, a mode in which a curved line such as a concave arc or a slanted line may be employed.

  In this case, since the entire side surface of the reinforcing portion is a concave curved surface, an end portion of the reinforcing portion opposite to the base portion smoothly continues to the side wall of the stopper portion, and the base portion It is preferable that the side end portion is smoothly continuous with the base portion.

  In this invention, when it sees from the said axial direction, the outer edge of the said reinforcement part can employ | adopt the aspect in which the bent part becomes a curve. According to this aspect, it is possible to alleviate the stress concentration on the specific portion of the reinforcing portion. Therefore, it is possible to prevent the rotation restricting portion from being damaged.

  In the present invention, the reinforcing portion may include a radially inner reinforcing portion that protrudes radially inward from the stopper portion where the support shaft is located, and adopts an aspect in which the reinforcing portion is formed on the entire circumference of the stopper portion. it can.

  In this case, it is preferable that the radially inner reinforcing portion has a smaller dimension in the axial direction than the reinforcing portions other than the radially inner reinforcing portion among the reinforcing portions. According to this aspect, interference between the radially inner reinforcing portion and the gear can be avoided.

  In the present invention, the gear includes a cylindrical portion into which the support shaft is inserted, and a protruding portion protruding outward from the cylindrical portion, and a tooth portion is provided on an outer peripheral surface of the protruding portion. A groove portion extending in a circumferential direction around the axis is provided on a surface of the projecting portion that faces the base portion, and the stopper portion is inserted into the groove portion at a tip side from the reinforcing portion, The abutting part can adopt a mode in which it is a wall surface part defining the circumferential end of the inner wall surface of the groove part.

  In this invention, when it sees from the said axial direction, the said stopper part can employ | adopt the aspect extended in the circumferential direction around the said spindle.

In this case, the stopper part can adopt a mode in which an inner peripheral part located on the side of the support shaft in the side wall is an arc surface centered on the axis.
In this invention, the said supporting member is a case which accommodates the said gearwheel, and the aspect by which the said base part is comprised by the baseplate part of the said case is employable.

  In this invention, the said case can employ | adopt the aspect which is an integrally molded product by resin including the said spindle and the said rotation control part. According to this aspect, the number of parts can be suppressed as compared with the case where each is a separate member. Moreover, since the rotation restricting portion (the stopper portion and the reinforcing portion) is integrated, it is easy to ensure the strength between the stopper portion and the reinforcing portion.

  In the present invention, the motor housed in the case as the drive source, a power supply cable for supplying power to the motor, a transmission gear that meshes with the gear and transmits the driving force of the motor to the gear, It is possible to adopt a mode having a transmission gear support shaft that protrudes from the bottom plate portion in the same direction as the support shaft and rotatably supports the transmission gear.

  In this case, the bottom plate portion includes a guide wall that protrudes in the same direction as the support shaft and guides the power feeding cable in the case, and the rotation restricting portion is for the transmission gear around an axis of the support shaft. Provided in an angular range between the support shaft and the guide wall, the reinforcing portion is continuous with the guide wall, and the guide wall is a guide surface located on a side opposite to the rotation restricting portion. A mode of guiding the power feeding cable can be adopted. According to such an aspect, it is easy to route the power feeding cable in a region where the power feeding cable does not interfere with the gears or the like. Moreover, it becomes easy to arrange | position a transmission gearwheel and a rotation control part in the position which does not mutually interfere. Furthermore, since the guide wall and the reinforcing portion are continuous, the rigidity of the guide wall is improved.

  The gear unit according to the present invention can be used for a cold air damper. In this case, the cold air damper has a frame in which an opening is formed, a baffle for opening and closing the opening, and an output gear meshing with the gear, and the baffle is connected to the output gear. The baffle is driven by driving the motor. According to this aspect, the rotation angle range of the gear preceding the output gear is defined by the rotation restricting mechanism. Therefore, the angle range in which the output gear rotates can be accurately defined. In addition, since the gear unit includes a rotation restricting mechanism that defines the rotation angle range of the gear that transmits the driving force of the motor, the rotation angle range of the baffle connected to the output gear meshing with the gear can be defined. Further, since the rotation restricting portion that restricts the rotation of the gear by contacting the gear abutting portion in the rotation restricting mechanism includes a reinforcing portion, the rotation restricting mechanism and the rotation restricting portion each time the rotation angle range of the baffle is defined. Even when the portion collides with the base plate and the stress is generated on the base end side of the rotation restricting portion, the rotation restricting portion can be prevented or suppressed from being damaged.

  In the present invention, the gear includes a spur gear having a first tooth portion that meshes with the second gear, and a partial gear having a second tooth portion that meshes with the output gear, at different positions in the axial direction. The output gear is a sector gear, and the toothless gear has an outer periphery that is more circumferential than the tip circle of the second tooth portion at a position adjacent to the second tooth portion in the circumferential direction. An outer peripheral portion having an outer peripheral surface curved along the tip circle on the side, the outer peripheral portion having a length in the axial direction shorter than a tooth width of the second tooth portion, and An end face facing one side in the axial direction is provided at a position in the middle of the two tooth portions, and the sector gear is cut out at a portion facing the outer peripheral surface, and the tooth on one side in the axial direction on the end face A first tooth capable of entering the inner circumference side of the tip circle, and the first tooth positioned next to the first tooth A second tooth that can contact the outer peripheral surface when one tooth enters the inner peripheral side of the tip circle, and when the baffle is disposed at a closed position that closes the opening, The first tooth enters the inner peripheral side of the tip circle on one side of the end surface in the axial direction, the second tooth contacts the outer peripheral surface, and the sector gear rotates in a direction to open the baffle. It is desirable to prevent this. If it does in this way, it can prevent that the baffle arrange | positioned in a closed position moves.

  In this case, the baffle includes an elastic member that seals the opening, and the elastic member abuts against an opening edge of the opening in the frame when the baffle is disposed at the closed position. It is desirable to be elastically deformed. In this way, the opening can be reliably closed by the baffle. Here, the shape restoring force of the elastically deformed elastic member acts as a force for rotating the sector gear in the direction of opening the baffle, but the sector gear (output gear) opens the baffle when the baffle is placed in the closed position. Rotation in the direction is prevented. Therefore, the baffle does not move in the direction of opening the opening from the closed position by the shape restoring force of the elastic member.

  In the present invention, the rotation restricting portion includes a stopper portion that includes a contact portion that protrudes from the base portion and can be brought into contact with the contact portion of the gear at the tip portion, and a reinforcing portion that protrudes outward from the stopper portion. Here, the end of the reinforcing part opposite to the base part is continuous with the side wall of the stopper part, and the end part of the base part side is continuous with the base part. Even when the contact part of the gear and the contact part of the stopper part collide and stress is frequently generated at the base end part (root part) of the stopper part, the rotation restricting part may be damaged by the reinforcing part. Occurrence can be prevented or suppressed. Moreover, since the reinforcement part is provided in the base part of the stopper part, a reinforcement part and the contact part of a gearwheel do not interfere.

It is the perspective view which looked at the cold air damper which concerns on Embodiment 1 of this invention from the side by which the baffle is arrange | positioned. It is a disassembled perspective view of the cold air damper shown in FIG. It is a top view at the time of seeing a mode that a lid is removed from a gear unit concerning Embodiment 1 of the present invention from the 1st direction of the X direction. FIG. 4 is an exploded perspective view of the gear unit shown in FIG. 3. FIG. 4 is a plan view of the gear unit case shown in FIG. 3 as viewed from a first direction in the X direction. It is explanatory drawing which shows the meshing state of the drive gear and output gear which are shown in FIG. It is explanatory drawing of the drive gearwheel shown in FIG. FIG. 6 is a partially enlarged view in which a peripheral portion of a pedestal portion on which a drive gear is placed in the case shown in FIG. 5 is enlarged. It is a perspective view when the rotation control part shown in FIG. 8 is seen from the side where the second spindle is provided. It is a perspective view when the rotation control part shown in FIG. 8 is seen from the side where the guide wall is provided. FIG. 7 is a perspective view of the output gear shown in FIG. 6. FIG. 2 is a plan view of a drive gear and an output gear when the baffle is in a closed position in the damper device shown in FIG. 1. It is explanatory drawing of the opening / closing operation | movement of the opening part by the cold air damper shown in FIG. It is explanatory drawing of the opening / closing operation | movement of the opening part by the cold air damper shown in FIG. It is explanatory drawing of the gear unit which concerns on Embodiment 2 of this invention. It is explanatory drawing of the rotation control part etc. with respect to the 2nd drive gear shown in FIG. It is the perspective view which looked at the 2nd drive gear shown in Drawing 15 from the 2nd direction of the X direction. It is a top view of the case shown in FIG. It is a top view of the rotation control part provided in the gear unit which concerns on the modification 1 of Embodiment 2 of this invention. It is a top view of the rotation control part provided in the gear unit which concerns on the modification 2 of Embodiment 2 of this invention.

  Hereinafter, a cold air damper for a refrigerator to which the present invention is applied will be described with reference to the drawings.

[Embodiment 1]
(overall structure)
FIG. 1 is a perspective view of a cold air damper according to Embodiment 1 of the present invention as viewed from the side where a baffle is disposed. FIG. 1A shows a state where the opening is open, and FIG. 1B shows a state where the opening is closed. FIG. 2 is an exploded perspective view of the cold air damper shown in FIG. In the following description, the direction along the rotation center axis L0 of the baffle 2 in the cold damper 1 is the X direction, and the direction in which the opening 3 opened and closed by the baffle 2 is orthogonal to the X direction is the Z direction. The direction perpendicular to the direction and the Z direction is taken as the Y direction. In addition, one side in the X direction is a first direction X1 in the X direction, a side opposite to the first direction X1 in the X direction is a second direction X2 in the X direction, and one side in the Y direction is a first direction Y1, A side opposite to the first direction Y1 is a second direction Y2, one side in the Z direction is a first direction Z1, and a side opposite to the first direction Z1 is a second direction Z2.

  As shown in FIG. 1A, the cold air damper 1 includes a frame 5 including a rectangular opening 3 that opens in the Z direction, and a baffle 2 that opens and closes the opening 3 of the frame 5. Further, the cold air damper 1 includes a drive mechanism 6 for driving the baffle 2 as shown in FIG. The drive mechanism 6 includes a lid 7 provided integrally with the frame 5 in the second direction X2 in the X direction of the frame 5, and a drive chamber defined by a case 8 that covers the lid 7 from the second direction X2 in the X direction. 9. The case 8, the lid 7 and the drive mechanism 6 constitute a gear unit 10. The frame 5, the lid 7 and the case 8 are made of resin.

  As shown in FIG. 1A, the frame 5 includes a rectangular end plate portion 12 in which an opening 3 is formed, and a rectangular tube-shaped body portion 13 protruding from the outer edge of the end plate portion 12 in the second direction Z2. Have The lid 7 is provided integrally with the body portion 13 in the second direction X2 of the body portion 13 in the X direction. At the edge (opening edge) of the opening portion 3 in the end plate portion 12, a rectangular tube-shaped sealing plate portion 14 protruding toward the side where the baffle 2 is located is provided.

  Here, the state in which the baffle 2 is disposed at the open position 2 </ b> A that opens the opening 3 is the state illustrated in FIG. 1A, and the baffle 2 is in a posture orthogonal to the end plate portion 12. The state in which the baffle 2 is disposed at the closed position 2 </ b> B that closes the opening 3 is the state illustrated in FIG. 1B, and the baffle 2 extends in parallel with the end plate portion 12. The baffle 2 rotates between the closed position 2B and the open position 2A within an angle range of 90 °.

  The baffle 2 comes into contact with the seal plate portion 14 from the second direction Z2 to close the opening 3. A heater 15 is attached to the surface of the end plate portion 12 on the side where the baffle 2 is located so as to surround the opening 3 (the seal plate portion 14).

  The baffle 2 includes an opening / closing plate 19 having a rectangular flat plate portion 18 larger than the opening 3 and a rectangular elastic member 20 attached to the surface of the flat plate portion 18 on the opening 3 side. The elastic member 20 has a sheet shape and is made of polyurethane foam or the like. When the baffle 2 is disposed at the closed position 2 </ b> B, the elastic member 20 abuts on the seal plate portion 14 and seals the opening 3. Further, when the baffle 2 is disposed at the closed position 2B, the elastic member 20 comes into contact with the seal plate portion 14 and elastically deforms.

  As shown in FIG. 2, the baffle 2 includes a first shaft portion 21 in which an output shaft 6a of the drive mechanism 6 is inserted into an end portion in the second direction X2 in the X direction at the end portion in the first direction Y1 in the Y direction. Is provided. Further, the baffle 2 includes a second shaft portion 22 that is rotatably supported by the body portion 13 at the end portion in the first direction X1 in the X direction at the end portion in the first direction Y1 in the Y direction. When the drive mechanism 6 is driven, the baffle 2 rotates about the rotation center axis L0 coaxial with the first shaft portion 21 and the second shaft portion 22 to open and close the opening 3.

  The cold air damper 1 is disposed inside a duct that forms a cold air passage of the refrigerator. The cold air flows through the opening 3 from the side opposite to the side where the baffle 2 is disposed with respect to the opening 3. Alternatively, it flows through the opening 3 from the side where the baffle 2 is disposed with respect to the opening 3.

(Configuration of gear unit)
FIG. 3 is a plan view when the state where the lid 7 is removed from the gear unit 10 according to the first embodiment of the present invention is viewed from the first direction X1 in the X direction. FIG. 4 is an exploded perspective view of the gear unit 10 shown in FIG. FIG. 5 is a plan view when the case 8 of the gear unit 10 shown in FIG. 3 is viewed from the first direction X1 in the X direction. As shown in FIGS. 3, 4, and 5, the case 8 of the gear unit 10 has a bottom plate portion 25 that spreads in the Y direction and the Z direction, and from the bottom plate portion 25 to the lid 7 side (first direction X1 in the X direction). It has a projecting rectangular tube-shaped case body 26. The case 8 corresponds to a “support member” in the present invention, and the bottom plate portion 25 corresponds to a “base portion” in the present invention.

  The drive mechanism 6 is housed in the case 8. The drive mechanism 6 includes a motor 31 as a drive source and a train wheel 32 that transmits the rotation of the motor 31 to the baffle 2. The motor 31 is a stepping motor, and its output shaft 31a is oriented in the first direction X1 in the X direction. The motor 31 is disposed at an end portion of the case 8 in the second direction Y2 in the Y direction. A pinion 33 is attached to the output shaft 31 a of the motor 31.

  The train wheel 32 includes a pinion 33, a first gear 34 having a large diameter gear meshing with the pinion 33, and a second gear (second gear) having a large diameter gear meshing with a small diameter gear (not shown) of the first gear 34. And a drive gear (gear) 36 that meshes with the small-diameter gear of the second gear 35. In the gear train 32, the first gear 34, the second gear 35, and the drive gear 36 constitute a reduction gear train. The drive gear 36 is provided concentrically and integrally with the large-diameter gear 37 in the first direction X1 in the X direction of the large-diameter gear 37 and the large-diameter gear (spur gear) 37 that meshes with the small-diameter gear of the second gear 35. It is a compound gear provided with a partly-toothed gear 38. The drive gear 36 corresponds to a “gear” in the present invention, and the second gear 35 is a gear that transmits a driving force to the drive gear 36 and corresponds to a “transmission gear” in the present invention.

  The first gear 34 is rotatably supported by a first support shaft (not shown) protruding from the lid 7 in the second direction X2 in the X direction. As shown in FIGS. 4 and 5, the second gear 35 is rotatably supported by a second support shaft (transmission gear support shaft) 41 protruding from the bottom plate portion 25 of the case 8 in the first direction X1 in the X direction. ing. The bottom plate portion 25 has a pedestal portion 42 that protrudes stepwise in the first direction X1 in the X direction. The drive gear 36 is mounted on a pedestal portion 42 that protrudes from the bottom plate portion 25 of the case 8 in the first direction X1 in the X direction, and a third support shaft (support shaft) that protrudes from the pedestal portion 42 in the first direction X1 in the X direction. ) 43 is rotatably supported. A part of the end surface of the base portion 42 in the first direction X1 in the X direction is a mounting surface 42a on which the drive gear 36 is mounted, and is a plane orthogonal to the X direction. The drive gear 36 rotates about the axis L <b> 1 of the third support shaft 43. Therefore, the axis L1 of the third support shaft 43 is the rotation center line of the drive gear 36.

  The train wheel 32 has an output gear 39 that meshes with the toothless gear 38 of the drive gear 36 and is driven by the drive gear 36. The output gear 39 is a sector gear and includes an output shaft 6 a connected to the baffle 2. The output gear 39 is rotatably supported by a bearing cylinder portion 44 protruding from the bottom plate portion 25 of the case 8 in the first direction X1 in the X direction. The output gear 39 rotates about the axis L <b> 2 of the bearing cylinder portion 44. The axis L2 of the bearing cylinder portion 44 is the rotation center line of the output gear 39 and the rotation center axis L0 of the baffle 2. Each gear constituting the train wheel 32 is a resin molded product. The case is an integrally molded product made of resin.

  Here, as shown in FIG. 3, a power supply cable 45 for supplying power to the motor 31 is routed in the case 8.

Specifically, as shown in FIGS. 4 and 5, in the case body 26, the body portion 26 a extending in the Y direction at the end in the second direction X2 in the Z direction has an end in the first direction Y1 in the Y direction. A pull-in port 46 for pulling the power supply cable 45 from the outside into the case 8 is provided in the portion. The inlet 46 is a notch provided by notching the body portion 26a from the first direction X1 in the X direction. In the case 8, a guide wall 47 that protrudes from the bottom plate portion 25 in the first direction X <b> 1 in the X direction and extends in the Y direction from the inlet 46 toward the motor 31 is provided. The guide wall 47 is located between the body portion 26 a of the case body portion 26 and the third support shaft 43. The guide wall 47 is opposed to the body portion 26a of the case body portion 26 with a gap therebetween, and a cable passage 48 is formed between the guide wall 47 and the body portion 26a. The power supply cable 45 is introduced into the case 8 from the service port 46, and then is pulled out along the cable passage 48 and connected to the motor 31. The guide wall 47 guides the power feeding cable 45 with a guide surface 47 a located on the opposite side to the third support shaft 43.

(Configuration of Drive Gear 36 and Rotation Restricting Mechanism 50)
FIG. 6 is an explanatory view showing a meshed state of the drive gear 36 and the output gear 39 shown in FIG. FIG. 6A is a perspective view of the drive gear 36 and the output gear 39 as viewed from the side of the toothless gear 38 of the drive gear 36 (first direction X1 in the X direction), and FIG. 4 is a perspective view of the gear 36 and the output gear 39 when viewed from the large-diameter gear 37 side of the drive gear 36 (second direction X2 in the X direction). FIG. FIG. 7 is an explanatory diagram of the drive gear 36 shown in FIG. 7A is a perspective view of the drive gear 36 when viewed from the side of the toothless gear 38 (first direction X1 in the X direction), and FIG. 7B is a diagram illustrating the rotation center line ( FIG. 7C is a plan view when the drive gear 36 is viewed from the large-diameter gear 37 (second direction X2 in the X direction) when viewed from a direction orthogonal to the axis L1). is there. FIG. 8 is a partial enlarged view in which the peripheral portion of the pedestal portion 42 on which the drive gear 36 is placed in the case 8 shown in FIG. 5 is enlarged. FIG. 9 is a perspective view of the rotation restricting portion 55 shown in FIG. 8 as viewed from the side where the second support shaft 41 is provided. FIG. 10 is a perspective view when the rotation restricting portion 55 shown in FIG. 8 is viewed from the side where the guide wall is provided.

  As shown in FIG. 7, the drive gear 36 includes a cylindrical portion 51 into which the third support shaft 43 is inserted, and an annular protruding portion (protruding portion) 52 that protrudes from the midway position of the cylindrical portion 51 in the direction of the axis L1. Is provided. The annular projecting portion 52 includes a tooth portion (first tooth portion) 37 a that meshes with the second gear 35 on the outer peripheral surface. That is, the annular protrusion 52 constitutes the large diameter gear 37. The cylindrical portion 51 has a tooth portion (second tooth portion) 38a that meshes with the output gear 39 at a portion of the outer peripheral surface in the first direction X1 with respect to the first direction X1 in the X direction. That is, a portion of the cylindrical portion 51 closer to the first direction X1 in the X direction than the annular projecting portion 52 constitutes the partial gear 38. The side of the cylindrical portion 51 in the second direction X2 in the X direction with respect to the annular protrusion 52 is a gear base 53 having an annular outer peripheral surface.

  Moreover, as shown in FIG.7 (c), the drive gear 36 is on the end surface (opposite surface) 37b of the 2nd direction X2 of the X direction which opposes the baseplate part 25 in the large diameter gear 37 (annular protrusion part 52), A circular arc groove (groove portion) 54 having a constant width over a predetermined angle range is provided around the axis L1. Wall surface portions 54a and 54b that respectively define circumferential ends on the inner wall surface of the arc groove 54 are flat surfaces extending in the radial direction in parallel with the axis L1. The wall surface portions 54 a and 54 b together with the rotation restricting portion 55 provided in the case 8 constitute a rotation restricting mechanism 50 that restricts the rotation angle range of the drive gear 36.

  Here, as shown in FIG. 5, the rotation restricting portion 55 is provided in an angular range between the second support shaft 41 and the guide wall 47 around the axis L <b> 1 of the third support shaft 43. Further, the rotation restricting portion 55 is provided on the outer peripheral side of the third support shaft 43 with a certain distance from the third support shaft 43. The rotation restricting portion 55 is a substantially arc-shaped protrusion extending in the circumferential direction around the axis L1.

As shown in FIG. 8, the rotation restricting portion 55 is a stopper that protrudes in the first direction X <b> 1 in the X direction (in the direction of the axis L <b> 1 of the third support shaft 43) from the placement surface 42 a of the base portion 42 in the bottom plate portion 25. A unit 56 is provided. When the third support shaft 43 is inserted into the cylindrical portion 51 of the drive gear 36 and the drive gear 36 (cylindrical portion 51) is placed on the placement surface 42a, the stopper portion 56 is provided by a reinforcing portion 57 described later. The tip portion in the first direction X1 is inserted into the arc groove 54.

  At both ends in the circumferential direction of the tip portion inserted into the circular arc groove 54 in the stopper portion 56, contact portions 59a and 59b capable of coming into contact with the wall surface portions 54a and 54b are provided. The contact portion 59 a abuts against a wall surface portion 54 a that defines one end in the circumferential direction among the inner wall surfaces of the arc groove 54 to restrict the rotation of the drive gear 36. The contact portion 59b abuts against a wall surface portion 54b that defines the other end in the circumferential direction among the inner wall surfaces of the arc groove 54 to restrict the rotation of the drive gear 36. The portions 59a and 59b per degree are flat surfaces extending in the radial direction parallel to the axis L1 and facing in the circumferential direction around the axis L1. The drive gear 36 rotates between the position where the contact portion 59a contacts one wall surface portion 54a of the arc groove 54 and the position where the contact portion 59b contacts the other wall surface portion 54b of the arc groove 54. Permissible.

  Further, as will be described later, the rotation restricting portion 55 includes a reinforcing portion 57 that protrudes outward from the side wall 560 of the stopper portion 56 when viewed from the X direction (axis L1 direction). The reinforcing portion 57 is provided between the placement surface 42a and the contact portions 59a and 59b in the X direction (axis L1). That is, the reinforcing portion 57 protrudes outward from the side wall 560 of the stopper portion 56 when viewed from the X direction (in the direction of the axis L1) at the base portion closer to the bottom plate portion 25 than the contact portions 59a and 59b. The side surface 570 of the reinforcing portion 57 has an end portion on the side opposite to the bottom plate portion 25 continuous with the side wall 560 of the stopper portion 56, and an end portion on the bottom plate portion 25 side continuous with the bottom plate portion 25. Accordingly, the reinforcing portion 57 reinforces the stopper portion 56. In the present embodiment, the bottom plate portion 25 includes a pedestal portion 42, and a part of the end portion on the bottom plate portion 25 side of the reinforcing portion 57 is continuous with the pedestal portion 42 in the bottom plate portion 25. Further, the side surface 570 of the reinforcing portion 57 has a concave curved surface or a slope at the end opposite to the bottom plate portion 25, and the concave curved surface or the slope does not form a step on the side wall 560 of the stopper portion 56. It is continuous. That is, the side surface 570 of the reinforcing portion 57 is a curved line such as a concave arc or a diagonal line when the end opposite to the bottom plate portion 25 is cut by a plane parallel to the axis L1. In this embodiment, the side surface 570 of the reinforcing portion 57 has a concave curved surface at the end opposite to the bottom plate portion 25, and thus is smoothly continuous with the side wall 560 of the stopper portion 56.

  In this example, as the reinforcing portion 57, a first circumference that protrudes from the base side of the stopper portion 56 (the base side from the contact portion 59 a) and projects to one side in the circumferential direction as the reinforcing portion 57 and continues to the guide wall 47. Direction reinforcing portion 57a, radially outer reinforcing portion 57b protruding so as to project to the outer peripheral side of the stopper portion 56, and the axis L1 around the base portion side of the stopper portion 56 (the base side from the contact portion 59b) in the circumferential direction. And a second circumferential reinforcing portion 57c protruding so as to project to the other side. Here, since the radially outer reinforcing portion 57b overlaps the edge of the pedestal portion 42, the end portions of the first circumferential reinforcing portion 57a and the second circumferential reinforcing portion 57c on the bottom plate portion 25 side are the bottom plate portion 25. Among them, it continues to the mounting surface 42a of the pedestal portion 42, and the end of the radially outer reinforcing portion 57b continues to the portion of the bottom plate portion 25 where the pedestal portion 42 is not formed. The guide surface 47 a of the guide wall 47 is located on the side opposite to the rotation restricting portion 55.

  In this embodiment, each of the first circumferential reinforcing portion 57a, the radially outer reinforcing portion 57b, and the second circumferential reinforcing portion 57c is an end portion on the side opposite to the bottom plate portion 25 and an end portion on the bottom plate portion 25 side. In the middle, there are provided bottom raised portions 57d, 57e, and 57f that protrude in the same direction as the third support shaft 43 from the bottom plate portion 25 with their side surfaces oriented in a direction orthogonal to the direction of the axis L1. In the present embodiment, of the bottom raised portions 57d, 57e, 57f, the bottom raised portion 57d of the first circumferential reinforcing portion 57a and the bottom raised portion 57f of the second circumferential reinforcing portion 57c are the contact portions 59a, 59b of the stopper portion 56. Further, it has a flat surface extending in the circumferential direction and facing the first direction X1 in the X direction.

Here, the end portion of the first circumferential direction reinforcing portion 57 a in the first direction X <b> 1 in the X direction smoothly continues to the stopper portion 56. That is, the 1st circumferential direction reinforcement part 57a is provided with the round part which has the concave curved surface 55a which approaches the stopper part 56 toward the 1st direction X1 of a X direction in the boundary part with the stopper part 56 of the bottom raising part 57d. The concave curved surface 55a continues without a step to the edge of the contact portion 59a in the second direction X2 in the X direction.

  Further, the end portion in the first direction X1 in the X direction in the radially outer reinforcing portion 57b is smoothly continuous with the stopper portion 56. That is, the radially outer reinforcing portion 57b includes a rounded portion having a concave curved surface 55b that approaches the stopper portion 56 toward the first direction X1 in the X direction at the boundary portion between the bottom raised portion 57e and the stopper portion 56. Here, the stopper portion 56 includes an arcuate surface 56b extending at a constant width in the circumferential direction and connecting between the contact portions 59a and 59b on the opposite side of the tip portion from the third support shaft 43. The concave curved surface 55b continues to the edge of the arc surface 56b in the second direction X2 in the X direction without a step. In addition, the width (dimension in the X direction) of the arc surface 56b is equal to the width (dimension in the X direction) of the portions 59a and 59b.

  Further, the end portion of the second circumferential reinforcing portion 57c in the first direction X1 in the X direction continues to the stopper portion 56 from the lick. That is, the second circumferential reinforcing portion 57c includes a rounded portion having a concave curved surface 55c that approaches the stopper portion 56 toward the first direction X1 in the X direction at a boundary portion between the bottom raised portion 57f and the stopper portion 56. The concave curved surface 55c continues without a step to the edge of the contact portion 59b in the second direction X2 in the X direction.

  Furthermore, the end portion of the second circumferential direction reinforcing portion 57c in the second direction X2 in the X direction continues to the mounting surface 42a after being licked. That is, the second circumferential reinforcing portion 57 c includes a rounded portion having a concave curved surface 55 d that approaches the mounting surface 42 a toward the circumferential direction at a boundary portion in the circumferential direction with the pedestal portion 42. The concave curved surface 55d continues to the mounting surface 42a without a step.

  Further, the radially outer side surface of the radially outer reinforcing portion 57b (bottom raising portion 57e) is continuous with the radially outer side surfaces of the bottom raised portions 57d and 57f of the first circumferential reinforcing portion 57a and the second circumferential reinforcing portion 57c. In the radially outer side surfaces of the raised portions 57e, 57e, and 57f, the end portions in the second direction X2 in the X direction are concave curved surfaces or inclined surfaces. Therefore, the radially outer side surfaces of the bottom raised portions 57e, 57e, and 57f are continuous without forming a step in the bottom plate portion 25. In this embodiment, the radially outer side surfaces of the bottom raised portions 57e, 57e, and 57f have a concave curved surface 55e at the end portion in the second direction X2 in the X direction, and are smoothly continuous with the bottom plate portion 25.

  An inner peripheral side wall surface 56 a located on the third support shaft 43 side in the stopper portion 56 is an arc surface defined at the center of the axis L <b> 1 of the third support shaft 43. In this embodiment, the inner peripheral side wall surface 56a located on the third support shaft 43 side in the stopper portion 56 is radially inward of the raised portions 57d and 57f of the first circumferential reinforcing portion 57a and the second circumferential reinforcing portion 57c. The inner peripheral side wall surface 56a and the radially inner side surfaces of the bottom raised portions 57d, 57f are formed in a concave curved surface or a sloped surface in the second direction X2 in the X direction. It has become. In this embodiment, the radially inner side surfaces of the inner peripheral side wall surface 56a and the bottom raised portions 57d and 57f have a concave curved surface 55f at the end portion in the second direction X2 in the X direction, and the pedestal portion 42 of the bottom plate portion 25. It continues smoothly. Here, a portion of the concave curved surface 55f formed on the inner peripheral side wall surface 56a constitutes a radially inner reinforcing portion 57g projecting radially inward from the sidewall 560 of the stopper portion 56, and the radial direction The end of the inner reinforcing portion 57g opposite to the bottom plate portion 25 is smoothly continuous with the inner peripheral side wall surface 56a of the stopper portion 56. The radially inner reinforcing portion 57g has a smaller dimension in the X direction than the other reinforcing portions (the first circumferential reinforcing portion 57a, the radially outer reinforcing portion 57b, and the second circumferential reinforcing portion 57c), and the bottom plate portion 25. It is in a low position when viewed. For this reason, interference between the drive gear 36 and the radially inner reinforcing portion 57g does not occur.

  In this embodiment, the first rotation direction A1 of the drive gear 36 indicated by an arrow A1 in FIGS. 3 and 6 is a rotation direction for rotating the baffle 2 in the opening direction. The output gear 39 driven by the drive gear 36 rotates in the first rotation direction B1 indicated by the arrow B1 in FIGS. 3 and 6 when the drive gear 36 rotates in the first rotation direction A1. On the other hand, the second rotation direction A2 of the drive gear 36 indicated by an arrow A2 in FIGS. 3 and 6 is a rotation direction for rotating the baffle 2 in the closing direction. The output gear 39 driven by the drive gear 36 rotates in the second rotation direction B2 indicated by the arrow B2 in FIG. 3 when the drive gear 36 rotates in the second rotation direction A2.

  In the state where the baffle 2 is disposed at the closed position 2B, as shown in FIG. 6B, the rotation of the wall portion 54a that defines one circumferential end of the arc groove 54 of the large-diameter gear 37 and the rotation of the case 8 is restricted. The portion 55 (the portion 59a per stopper portion 56) comes into contact. The contact portion 59a abuts against the wall surface portion 54a from the front in the second rotation direction A2 of the drive gear 36 and restricts the drive gear 36 from rotating further in the second rotation direction A2 (rotation direction closing the baffle 2). To do. On the other hand, in the state where the baffle 2 is disposed at the open position 2A, the wall surface portion 54b that defines the other end in the circumferential direction of the circular arc groove 54 of the large-diameter gear 37 and the rotation restricting portion 55 of the case 8 (the degree of the stopper portion 56). The contact portion 59b abuts (see FIG. 13). The contact portion 59b abuts against the wall surface portion 54b from the front in the first rotation direction A1 of the drive gear 36 and restricts the drive gear 36 from rotating further in the first rotation direction A1 (rotation direction for opening the baffle 2). To do.

  Next, as shown in FIG. 7A and FIG. 7B, the partial gear 38 includes a tooth portion 38a over a predetermined angular range narrower than 180 °. In addition, the toothless gear 38 has an arcuate outer peripheral portion having an outer peripheral surface 60a that is curved along the tooth tip circle on the outer peripheral side of the tooth tip circle of the tooth portion 38a at a position adjacent to the tooth portion 38a in the circumferential direction. (Outer peripheral part) 60 is provided. The arcuate outer peripheral portion 60 projects from the end surface of the large-diameter gear 37 in the first direction X1 in the X direction along the rotation center axis (axis L1) of the drive gear 36 in the first direction X1 in the X direction. In addition, the arc-shaped outer peripheral portion 60 has a length in the X direction that is shorter than the tooth width of the tooth portion 38a (the length of the tooth portion 38a in the X direction), and is positioned in the middle of the tooth portion 38a in the X direction. An end face 60b facing the first direction X1 (one side in the direction of the axis L1) is provided. The outer circumferential surface 60a of the arc-shaped outer circumferential portion 60 is an arc surface that is concentric with the tooth tip circle of the tooth portion 38a and has a larger diameter than the tooth tip circle.

(Configuration of output gear 39)
FIG. 11 is a perspective view of the output gear 39 shown in FIG. 6, and is a perspective view when the output gear 39 is viewed from the first direction X1 side in the X direction. 12 is a plan view of the drive gear 36 and the output gear 39 when the baffle 2 is in the closed position 2B in the cool air damper 1 shown in FIG. As shown in FIG. 11, the output gear 39 includes an output shaft 6a, a shaft portion 61 coaxial with the output shaft 6a, and a columnar portion 62 provided coaxially between the output shaft 6a and the shaft portion 61. The shaft portion 61 is located at the end of the output gear 39 in the second direction X2 in the X direction. The shaft portion 61 is inserted into the bearing cylinder portion 44 of the bottom plate portion 25 of the case 8. As a result, the output gear 39 can rotate about the axis L <b> 2 of the bearing cylinder portion 44.

  The output shaft 6 a is the output shaft 6 a of the drive mechanism 6. Flat portions 64 parallel to both sides of the axis L2 are provided on the outer peripheral surface of the output shaft 6a. The first shaft portion 21 of the baffle 2 is formed with a recess that fits into the output shaft 6a on the end surface in the second direction X2 in the X direction, and the output shaft 6a rotates by fitting the output shaft 6a into the recess. Can be transmitted to the baffle 2. The outer diameter of the cylindrical portion 62 is larger than the outer diameter of the shaft portion 61 and the outer diameter of the output shaft 6a.

  Further, the output gear 39 includes an arc portion 65 having a tooth portion 39 a on the outer peripheral surface thereof on the outer peripheral side of the cylindrical portion 62. Between the cylindrical part 62 and the circular arc part 65, the connection part 66 extended in radial direction and connecting these is provided.

  Of the plurality of teeth constituting the tooth portion 39a, the first tooth 68 positioned at the front end in the first rotation direction B1 (rotation direction for opening the baffle) is a missing gear as shown in FIG. 6 (a) and FIG. The part which opposes the outer peripheral surface 60a of 38 circular arc-shaped outer peripheral parts 60 is notched. As a result, the first teeth 68 can enter the inner peripheral side of the addendum circle of the toothless gear 38 in the first direction X1 in the X direction on the end surface 60b of the arc-shaped outer peripheral portion 60. Moreover, the 2nd tooth | gear 69 located next to the 1st tooth | gear 68 among the some teeth which comprise the tooth | gear part 39a is notched in the axis line L2 direction from the side in which the 1st tooth | gear 68 is located. The tooth width of the second tooth 69 is shorter than the height dimension in the X direction of the arcuate outer peripheral portion 60, and the second tooth 69 is on the second direction X2 side in the X direction from the end surface 60 b of the arcuate outer peripheral portion 60. It does not protrude from the end surface 60b of the arc-shaped outer peripheral portion 60 toward the first direction X1 in the X direction. Other teeth except the first tooth 68 and the second tooth 69 in the output gear have the same tooth width as the tooth width of each tooth 38a of the toothless gear 38.

  Here, as shown in FIG. 12, the first tooth 68 of the output gear 39 enters the inner peripheral side of the tip circle in the first direction X1 in the X direction on the end surface 60b of the arc-shaped outer peripheral portion 60 of the toothless gear 38. Then, the second teeth 69 of the output gear 39 abut against the outer peripheral surface 60a of the arc-shaped outer peripheral portion 60, and the rotation of the output gear 39 is restricted. That is, the arcuate outer peripheral portion 60 of the toothless gear 38 and the first teeth 68 and the second teeth 69 of the output gear 39 constitute a second rotation restricting mechanism 70 that restricts the rotation of the output gear 39 in a specific direction. . In this example, when the drive gear 36 rotates in the second rotation direction A2 that closes the baffle 2 and stops at the restriction position where the rotation restriction mechanism 50 restricts the rotation in the second rotation direction A2, the first tooth of the output gear 39 68 enters the inner peripheral side of the addendum circle in the first direction X1 in the X direction on the end surface 60b of the arc-shaped outer peripheral portion 60 of the toothless gear 38. Accordingly, the second teeth 69 of the output gear 39 abut on the outer peripheral surface 60a of the arc-shaped outer peripheral portion 60, and the output gear 39 is restricted from rotating in the first rotation direction B1 that opens the baffle 2.

(Opening / closing operation of opening by cold air damper)
13 and 14 are explanatory diagrams of the opening / closing operation of the opening 3 by the cold air damper 1 shown in FIG. 13A is a cross-sectional view of the baffle 2 and the frame 5 in a state where the baffle 2 is in the open position 2A, and FIG. 13B is a partial gear 38 and an output gear when the baffle 2 is in the open position 2A. It is a partial top view of the gear unit 10 which shows the meshing state of 39. 14A is a cross-sectional view of the baffle 2 and the frame 5 when the baffle 2 is in the closed position 2B, and FIG. 14B is a partial gear 38 and an output gear when the baffle 2 is in the closed position 2B. It is a partial top view of the gear unit 10 which shows the meshing state of 39.

  As shown in FIGS. 1A and 13, in a state where the baffle 2 is disposed at the open position 2 </ b> A, the drive gear 36 is driven by the rotation restricting mechanism 50 in the first rotation direction A <b> 1 (the rotation direction in which the baffle 2 is opened). It stops at the restricted position where further rotation is restricted. That is, the rotation restricting portion 55 provided in the case 8 restricts the rotation of the drive gear 36 in the first rotation direction A <b> 1 by the contact portion 59 b contacting the wall surface portion 54 b of the arc groove 54 of the drive gear 36. doing. The tooth portion 38a of the partial gear 38 is engaged with two teeth 72 located at an end portion on the opposite side to the first tooth 68 in the circumferential direction among the plurality of teeth of the output gear 39.

  When closing the opening 3, the cold air damper 1 drives the motor 31 in a predetermined rotational direction by a predetermined number of steps. Thereby, the drive gear 36 rotates in the second rotation direction A2. Accordingly, the output gear 39 rotates in the second rotation direction B2. When the output gear 39 rotates in the second rotation direction B2, the baffle 2 connected to the output shaft 6a of the output gear 39 rotates in the closing direction C from the open position 2A toward the closed position 2B.

When the motor 31 is driven by a predetermined number of steps, the drive gear 36 is regulated such that rotation in the second rotation direction A2 (rotation direction for closing the baffle 2) is regulated by the rotation regulation mechanism 50, as shown in FIG. Stop at position. That is, the rotation restricting portion 55 (the contact portion 59a of the stopper portion 56) provided in the case 8 is in contact with the wall surface portion 54a of the arc groove 54 of the drive gear 36, and the drive gear 36 in the second rotation direction A2. Regulate further rotation. In this state, the first teeth 68 of the output gear 39 enter the inner peripheral side of the tip circle of the output gear 39 in the first direction X1 in the X direction on the end surface 60b of the arcuate outer peripheral portion 60 of the missing gear 38. Further, the second teeth 69 of the output gear 39 abut on the outer peripheral surface 60 a of the arc-shaped outer peripheral portion 60. The baffle 2 is disposed at the closed position 2B, and the elastic member 20 abuts on the seal plate portion 14 of the frame 5 and elastically deforms. Accordingly, the opening 3 is reliably closed by the baffle 2.

  The predetermined number of steps for driving the motor 31 is a value obtained by adding a plurality of steps to the prescribed number of steps for causing the baffle 2 disposed at the open position 2A to reach the closed position 2B. Accordingly, after the baffle 2 is disposed at the closed position 2B, the motor 31 is further driven by a plurality of steps. As a result, the baffle 2 is pressed further in the direction closer to the seal plate portion 14 from the closed position 2B, and the elastic member 20 is further deformed. Thereby, closing of the opening part 3 becomes more reliable. Here, if the motor 31 is further driven by a plurality of steps after the baffle 2 is disposed at the closed position 2B, the motor 31 will step out, and the baffle 2 will easily flutter due to the step out. With respect to such a problem, in this example, in a state where the baffle 2 is disposed at the closed position 2B, the second teeth 69 of the output gear 39 abut against the outer peripheral surface 60a of the arc-shaped outer peripheral portion 60, and the output gear 39 Is prevented from rotating in the first rotational direction B1 that opens the baffle 2. Therefore, the baffle 2 can be prevented from fluttering due to the step-out generated in the motor 31.

  Further, the shape restoring force of the elastic member 20 elastically deformed by the baffle 2 being disposed at the closed position 2B acts as a force for rotating the output gear 39 in the direction in which the baffle 2 is opened. That is, the shape restoring force of the elastic member 20 acts as a force for rotating the output gear 39 in the first rotation direction B1. On the other hand, in this example, in a state where the baffle 2 is disposed at the closed position 2B, the second teeth 69 of the output gear 39 abut on the outer peripheral surface 60a of the arc-shaped outer peripheral portion 60, and the output gear 39 Is prevented from rotating in the first rotation direction B1. Therefore, in the cold damper 1 of this example, the baffle 2 does not move in the direction of opening the opening 3 from the closed position 2B by the shape restoring force of the elastic member 20. Furthermore, since the output gear 39 is prevented from rotating in the second rotational direction that opens the baffle 2, the baffle 2 disposed at the open position 2A is prevented from fluttering under fluid pressure.

  Next, when opening the opening 3, the cool air damper 1 drives the motor 31 by a specified number of steps in the direction of rotation opposite to that when closing the opening 3. The specified number of steps is the number of steps for causing the baffle 2 arranged at the closed position 2B to reach the open position 2A. Thereby, the drive gear 36 rotates in the first rotation direction A1.

  When the drive gear 36 starts to rotate, the first tooth 38b (the front end tooth in the first rotational direction A1) located closest to the arcuate outer peripheral portion 60 in the tooth portion 38a of the toothless gear 38 is It meshes between the first tooth 68 and the second tooth 69 beyond the second tooth 69. As a result, the output gear 39 starts to rotate in the first rotation direction B1. When the output gear 39 rotates in the first rotation direction B1, the baffle 2 connected to the output shaft 6a of the output gear 39 rotates in the opening direction O from the closed position 2B toward the open position 2A.

(Function and effect)
In this example, the rotation restricting portion 55 for defining the rotation angle range of the drive gear 36 includes a stopper portion 56 that protrudes in the X direction from the bottom plate portion 25 of the case 8 and has contact portions 59a and 59b at the tip portions. Further, a reinforcing portion 57 (first circumferential reinforcing portion 57a, radially outer reinforcing portion 57b, second circumferential reinforcing portion 57c, and radially inner reinforcing portion 57g) projecting outward at the base portion of the stopper portion 56 is provided. Further, the side surface 570 of the reinforcing portion 57 is connected to the side wall 560 of the stopper portion 56 at the end opposite to the bottom plate portion 25, and the side surface 570 of the reinforcing portion 57 is connected to the bottom plate portion 25 at the end portion on the bottom plate portion 25 side. It is continuous and a part is continuous with the base part 42 (mounting surface 42a) of the bottom plate part 25. Accordingly, every time the rotation of the drive gear 36 is restricted, the collision between the contact portion of the drive gear 36 (the wall surface portions 54a and 54b of the arc groove 54) and the contact portions 59a and 59b of the stopper portion 56 is repeated, and the stopper Even when stress frequently occurs on the base end side (the mounting surface 42a side) of the portion 56, the reinforcing portion 57 causes damage such as a crack to occur on the base end side (root portion) of the stopper portion 56. It can be prevented or suppressed.

  Further, in the reinforcing part 57, the first circumferential reinforcing part 57a, the radially outer reinforcing part 57b, and the second circumferential reinforcing part 57c are respectively provided with bottom raised parts 57d, 57e, 57f. The dimension which protrudes from the reinforcement part 57 is short. For this reason, since the strength at the front end side of the stopper portion 56 is large, it is possible to prevent or suppress the occurrence of breakage or the like in the stopper portion 56.

  In this example, the reinforcing portion 57 includes a first circumferential reinforcing portion 57a and a second circumferential reinforcing portion 57c that project around the axis L1 from the stopper portion 56 in the circumferential direction. Here, the abutting portions (wall surface portions 54a and 54b of the arc groove 54) of the drive gear 36 collide with the stopper portion 56 from the circumferential direction, so that the impact of the collision is easily applied to the stopper portion 56 in the circumferential direction. Therefore, if the reinforcing portion 57 includes reinforcing portions (first circumferential direction reinforcing portion 57 a and second circumferential direction reinforcing portion 57 c) that protrude in the circumferential direction from the stopper portion 56, the contact portion between the stopper portion 56 and the drive gear 36. It is possible to prevent the rotation restricting portion 55 from being damaged due to contact with the wall surfaces 54a and 54b of the circular arc groove 54.

  Further, in this example, the reinforcing portion 57 includes a radially outer reinforcing portion 57 b that protrudes from the stopper portion 56 to the outer peripheral side. Here, when the contact portions of the drive gear 36 (wall surface portions 54 a and 54 b of the circular arc groove 54) collide with the stopper portion 56, the impact component of the collision also acts in the radial direction of the rotation restricting portion 55. To do. Therefore, if the reinforcing portion 57 includes the radially outer reinforcing portion 57b that protrudes outward from the stopper portion 56 in the radial direction, the rotation restricting portion 55 is damaged by the contact between the stopper portion 56 and the contacting portion. Can be suppressed more.

  In this example, the stopper portion 56 and the first circumferential reinforcing portion 57a are connected by a smooth concave curved surface 55a. Moreover, the stopper part 56 and the radial direction outer side reinforcement part 57b are connected by the smooth concave curved surface 55b. Further, the stopper portion 56 and the second circumferential reinforcing portion 57c are connected by a smooth concave curved surface 55c. The reinforcing portion 57 and the pedestal portion 42 (mounting surface 42a) are connected by a smooth concave curved surface 55d or the like. Therefore, the boundary portion between the stopper 56 and the first circumferential reinforcing portion 57a, the boundary portion between the stopper 56 and the radially outer reinforcing portion 57b, the boundary portion between the stopper 56 and the second circumferential reinforcing portion 57c, and reinforcement. Even when a stress is generated at a boundary portion between the portion 57 and the mounting surface 42a of the bottom plate portion 25, the concentration of stress can be relaxed, and damage such as a crack can be prevented from occurring at these boundary portions.

  Further, in this example, the case 8 is an integrally molded product made of resin, and the stopper portion 56 and the reinforcing portion 57 of the rotation restricting portion 55 are integrally molded, so that the strength between the stopper portion 56 and the reinforcing portion 57 is increased. It can be secured.

In this example, the contact portions 59a and 59b are flat surfaces extending in the radial direction in parallel with the axis L1, so that the contact portions of the drive gear 36 (wall surface portions 54a and 54b of the arc groove 54) are contact portions 59a. , 59b, the angle range in which the drive gear 36 rotates can be accurately defined. Further, since the contact portions (wall surface portions 54a and 54b of the arc groove 54) of the drive gear 36 are also flat surfaces extending in the radial direction in parallel with the axis L1, the contact portions (wall surface portions 54a and 54 of the arc groove 54).
When b) comes into contact with the contact portions 59a, 59b, the angular range in which the drive gear 36 rotates can be accurately defined. Furthermore, even when the contact portion of the drive gear 36 (the wall surface portions 54a and 54b of the circular arc groove 54) and the contact portions 59a and 59b are repeatedly contacted with each other, since both of them are flat, it is possible to suppress wear. it can. Therefore, even when the contact portion of the drive gear 36 (wall surface portions 54a and 54b of the arc groove 54) and the contact portions 59a and 59b are repeatedly contacted, the rotation angle range of the drive gear 36 changes due to wear. Can be suppressed.

  Further, in this example, a guide wall 47 for guiding the power supply cable 45 is provided in the case 8, and the guide wall 47 is located on the opposite side of the second support shaft 41 with the third support shaft 43 interposed therebetween. Accordingly, the power feeding cable 45 can be routed in a region (cable path 48) that does not interfere with the drive gear 36 and the second gear 35. Moreover, since the guide wall 47 and the reinforcement part 57 continue via the 1st circumferential direction reinforcement part 57a, the rigidity of the guide wall 47 can be improved. Further, since the rotation restricting portion 55 is located in the angular range between the second support shaft 41 and the guide wall 47 around the axis L1 of the third support shaft 43, the second support shaft 41 is supported by the second support shaft 41. The gear 35 and the rotation restricting portion 55 can be arranged at positions that do not interfere with each other.

  Here, in this example, since the rotation restricting portion 55 defines the rotation angle range of the drive gear 36 in the preceding stage of the output gear 39, the angle range in which the output gear 39 rotates can be accurately defined.

  In addition, the extension part (bottom raising parts 57d, 57e, 57f) with which the reinforcement part 57 is provided may be only the 1st circumferential direction reinforcement part 57a and the 2nd circumferential direction reinforcement part 57c. Moreover, the extending part with which the reinforcement part 57 is provided may be only any one of the 1st circumferential direction reinforcement part 57a and the 2nd circumferential direction reinforcement part 57c.

[Embodiment 2]
FIG. 15 is an explanatory diagram of the gear unit 10 according to the second embodiment of the present invention, and corresponds to a perspective view in a state where the lid is omitted. FIG. 16 is an explanatory diagram of the rotation restricting portion 55 and the like for the second drive gear 97 shown in FIG. FIG. 17 is a perspective view of the second drive gear 97 shown in FIG. 15 as viewed from the second direction X2 in the X direction. FIG. 18 is a plan view of the case 8 shown in FIG. Since the basic configuration of this embodiment is the same as that of Embodiment 1, the same reference numerals are given to portions having common functions, and detailed descriptions thereof are omitted.

  The gear unit 10 shown in FIG. 15 drives the baffle 2 in the cold air damper 1 as in the first embodiment. The gear unit 10 includes a case 8 and a drive mechanism 6 accommodated in the case 8, and the rotation of the motor 31 is first via a first gear 91, a second gear 92, and a third gear 93. It is transmitted to the drive gear 96. The rotation of the first drive gear 96 is transmitted to the fan-shaped output gear 98. In this embodiment, as the output gear 98, two sector gears 981, 982 are rotatably supported on the same output gear support shaft 81 (see FIG. 18), and each of the two sector gears 981, 982 is supported. The baffle 2 is connected. Therefore, the gear unit 10 of this embodiment can drive the two baffles 2.

As shown in FIG. 16, the first drive gear 96 is rotatably supported by a support shaft 82 that protrudes from the bottom plate portion 25 of the case 8 in the first direction X1 in the X direction. The first drive gear 96 includes a first cylindrical portion 960 into which the support shaft 82 is fitted, an annular projecting portion 961 projecting radially outward from the first cylindrical portion 960, and an annular shape radially outward from the first cylindrical portion 960. A second cylindrical portion 962 protruding from the protruding portion 961 in the first direction X1 in the X direction, and a sector gear 963 protruding from the annular protruding portion 961 through the second cylindrical portion 962 in the first direction X1 of the X direction. Have. A tooth portion 961 a is formed on the outer peripheral surface of the annular projecting portion 961. For this reason, when the rotation of the motor 31 is transmitted to the first drive gear 96 via the tooth portion 961a, the rotation of the first drive gear 96 is caused by the sector gear 981 when the sector gear 963 meshes with the sector gear 981. Communicated. In the sector gear 981, the tooth portion 981a is formed thick in the axial direction, whereas the tooth portion 981b is formed thin in the axial direction. Accordingly, when the tooth portion 981b rides on the first drive gear 96, the tooth portion 981b abuts on the outer peripheral surface of the second cylindrical portion 962 of the first drive gear 96 so as to prevent useless rotation of the sector gear 981. It has become.

  In the present embodiment, the second drive gear 97 is disposed so as to overlap the first drive gear 96 in the second direction X2 in the X direction, and the second drive gear 97 is a support shaft in the same manner as the first drive gear 96. 82 is rotatably supported.

  As shown in FIGS. 16 and 17, the second drive gear 97 includes a first cylindrical portion 970 into which the support shaft 82 is fitted, and a substantially oval-shaped annular protruding portion that protrudes radially outward from the first cylindrical portion 970. 971 and a fan-shaped engagement protrusion 973 that protrudes in the first direction X1 in the X direction from the annular protrusion 971 outside the first cylindrical portion 970 in the radial direction. Further, a second cylindrical portion 974 is formed from the annular projecting portion 971 toward the second direction X2 in the X direction, and the second cylindrical portion 974 is continuous from the arc-shaped outer edge of the annular projecting portion 971. Protruding. The second drive gear 97 is disposed so as to overlap the first drive gear 96 so that the engagement protrusion 973 fits into a fan-shaped opening 965 formed in the first drive gear 96. Accordingly, the first drive gear 96 and the second drive gear 97 are integrally rotated around the axis L81 of the support shaft 82. At this time, when the sector gear 972 meshes with the sector gear 982, the sector gear 982 rotates around the output gear support shaft 81. In the sector gear 982, the tooth portion 982a is formed thick in the axial direction, whereas the tooth portion 982b is formed thin in the axial direction. Therefore, when the tooth portion 982b rides on the second drive gear 97, the tooth portion 982b abuts on the outer peripheral surface of the first cylindrical portion 970 of the second drive gear 97 to prevent useless rotation of the sector gear 982. It has become.

  Further, both ends of the plate spring 99 are held in the case 8, and in this state, the plate spring 99 is in contact with the outer peripheral surface of the annular projecting portion 971 of the second drive gear 97. The outer diameter of the annular projecting portion 971 changes in a cam shape in the circumferential direction. For this reason, when the large-diameter portion of the annular projecting portion 971 contacts the plate spring 99, a large load is applied to the second drive gear 97, so that the rotation of the second drive gear 97 is suppressed.

  Here, the support shaft 82 protrudes in the first direction X1 in the X direction from the bottom plate portion 25 of the case 8 and protrudes in the first direction X1 in the X direction from the base end side shaft portion 821. A distal end side shaft portion 822. The proximal end side shaft portion 821 is thicker than the distal end side shaft portion 822 and supports the second drive gear 97 in a rotatable manner. The distal end side shaft portion 822 supports the first drive gear 96 in a rotatable manner. An annular pedestal portion 84 is formed on the bottom plate portion 25 of the case 8 so as to surround the support shaft 82. A second drive gear 97 is mounted on the surface of the pedestal portion 84 in the first direction X1 in the X direction. It is the mounting surface 84a to be placed. Also in this embodiment, as in the first embodiment, the case 8 and the second drive gear 97 are made of resin.

  As shown in FIGS. 16, 17, and 18, in this embodiment as well, the rotation restricting mechanism 50 that defines the angular range in which the second drive gear 97 rotates around the axis of the support shaft 82 is configured, as in the first embodiment. Has been. More specifically, the second drive gear 97 has a constant width over a predetermined angle range around the axis L82 on the end surface (opposing surface) in the second direction X2 in the X direction facing the bottom plate portion 25 of the case 8. Arc grooves (groove portions) 54. Wall surface portions 54a and 54b that respectively define circumferential ends on the inner wall surface of the arc groove 54 are flat surfaces extending in the radial direction in parallel with the axis L82. The wall surface portions 54 a and 54 b together with the rotation restricting portion 55 provided in the case 8 constitute a rotation restricting mechanism 50 that restricts the rotation angle range of the second drive gear 97.

In this embodiment, the rotation restricting portion 55 has a stopper portion 56 that protrudes from the bottom plate portion 25 of the case 8 in the same direction as the support shaft 82, and the stopper portion 56 circumferentially around the axis L 82 of the support shaft 82. It is a substantially arc-shaped protrusion extending in the direction. Accordingly, when the support shaft 82 is inserted into the first cylindrical portion 970 of the second drive gear 97, the stopper portion 56 is inserted into the arc groove 54 at the tip portion in the first direction X1 from the reinforcing portion 57 described later. .

  At both ends in the circumferential direction of the tip portion inserted into the circular arc groove 54 in the stopper portion 56, contact portions 59a and 59b capable of coming into contact with the wall surface portions 54a and 54b are provided. The contact portion 59 a abuts against a wall surface portion 54 a that defines one end in the circumferential direction among the inner wall surfaces of the arc groove 54 to restrict the rotation of the drive gear 36. The contact portion 59b abuts against a wall surface portion 54b that defines the other end in the circumferential direction among the inner wall surfaces of the arc groove 54 to restrict the rotation of the drive gear 36. Each of the portions 59a and 59b is a plane that faces the circumferential direction around the axis L82. The second drive gear 97 has a portion between the position where the contact portion 59a contacts one wall surface portion 54a of the arc groove 54 and the position where the contact portion 59b contacts the other wall surface portion 54b of the arc groove 54. Rotation is allowed.

  Further, as will be described later, the rotation restricting portion 55 includes a reinforcing portion 57 that protrudes outward from the side wall 560 of the stopper portion 56 when viewed from the X direction (the direction of the axis L82). In this embodiment, the reinforcing portion 57 includes a first circumferential reinforcing portion 57r that protrudes around the axis L82 from the base side of the side wall 560 of the stopper portion 56 to one side in the circumferential direction, and the side wall of the stopper portion 56. A radially outer reinforcing portion 57s projecting so as to project radially outward from the root side of 560, and a first projecting projecting so as to project around the axis L82 from the root side of the side wall 560 of the stopper portion 56 to the other side in the circumferential direction. 2 circumferential direction reinforcement part 57t is provided. Each of the reinforcing portions 57 (the first circumferential reinforcing portion 57r, the radially outer reinforcing portion 57s, and the second circumferential reinforcing portion 57t) is connected to the side wall 560 of the stopper portion 56 at the end opposite to the bottom plate portion 25. The end on the bottom plate 25 side is continuous with the bottom plate 25. Accordingly, the reinforcing portion 57 reinforces the stopper portion 56.

  Here, the entire side surface 570 of the reinforcing portion 57 (the first circumferential direction reinforcing portion 57r, the radially outer side reinforcing portion 57s, and the second circumferential direction reinforcing portion 57t) is a concave curved surface or an inclined surface. That is, when the entire side surface 570 of the reinforcing portion 57 is cut along a plane parallel to the axis L82, it is a curved line such as a concave arc or a diagonal line. In this embodiment, the entire reinforcing portion 57 (the first circumferential reinforcing portion 57r, the radially outer reinforcing portion 57s, and the second circumferential reinforcing portion 57t) is a concave curved surface. Accordingly, the reinforcing portion 57 (the first circumferential reinforcing portion 57r, the radially outer reinforcing portion 57s, and the second circumferential reinforcing portion 57t) has an end opposite to the bottom plate portion 25 on the side wall 560 of the stopper portion 56. The end portion on the bottom plate portion 25 side is smoothly continuous with the bottom plate portion 25. In addition, the reinforcement part 57 is not formed in the inner peripheral side wall surface 56a extended in circular arc shape inside the radial direction of the stopper part 56. As shown in FIG.

  In this embodiment, the dimension of the reinforcing part 57 (the first circumferential reinforcing part 57r, the radially outer reinforcing part 57s, and the second circumferential reinforcing part 57t) in the direction of the axis L82 is equal to the height of the pedestal portion 84, and the reinforcing part 57 is connected to the side surface of the pedestal portion 84.

Even in this configuration, as in the first embodiment, the rotation restricting portion 55 for defining the rotation angle range of the second drive gear 97 protrudes from the bottom plate portion 25 of the case 8 in the X direction and protrudes from the tip portion. Stopper portion 56 having contact portions 59a and 59b, and a reinforcing portion 57 (first circumferential reinforcing portion 57r, radially outer reinforcing portion 57s, and second circumferential reinforcing portion) projecting outward at the root portion of the stopper portion 56. Part 57t). Further, the side surface 570 of the reinforcing portion 57 is connected to the side wall 560 of the stopper portion 56 at the end opposite to the bottom plate portion 25, and the side surface 570 of the reinforcing portion 57 is connected to the bottom plate portion 25 at the end portion on the bottom plate portion 25 side. It is continuous. Accordingly, every time the rotation of the drive gear 36 is restricted, the collision between the contact portion of the drive gear 36 (the wall surface portions 54a and 54b of the arc groove 54) and the contact portions 59a and 59b of the stopper portion 56 is repeated, and the stopper Even when stress frequently occurs on the base end side (the mounting surface 42a side) of the portion 56, the reinforcing portion 57 can prevent or suppress the occurrence of breakage such as a crack on the base end side of the stopper portion 56. .

[Modification 1 of Embodiment 2]
FIG. 19 is a plan view of rotation restricting portion 55 provided in gear unit 10 according to Modification 1 of Embodiment 2 of the present invention. In the second embodiment, the reinforcing portion 57 is not formed on the inner peripheral side wall surface 56a that extends in an arc shape on the radially inner side of the stopper portion 56. However, in this embodiment, the inner peripheral side wall surface 56a is also reinforced. The portion 57 is formed as a radially inner reinforcing portion 57u. Therefore, in this embodiment, the reinforcing portion 57 is formed on the entire circumference of the stopper portion 56.

  Here, the first circumferential reinforcing portion 57r, the radially outer reinforcing portion 57s, and the second circumferential reinforcing portion 57t are formed in a region of the bottom plate portion 25 of the case 8 where the pedestal portion 84 is not formed. Yes. On the other hand, the radially inner reinforcing portion 57u is formed in a region of the bottom plate portion 25 of the case 8 where the pedestal portion 84 is formed. Further, the radially inner reinforcing portion 57u is also formed with a concave curved surface or a sloped surface as a whole, and is continuous with the side wall 560 and the pedestal portion 84 of the stopper portion 56 without forming a step. In this embodiment, the radially inner reinforcing portion 57u is smoothly continuous with respect to the side wall 560 and the pedestal portion 84 of the stopper portion 56 because the entire side surface is a concave curved surface.

  Further, the radially inner reinforcing portion 57u has a smaller dimension in the direction of the axis L82 than the other reinforcing portions 57 (the first circumferential reinforcing portion 57r, the radially outer reinforcing portion 57s, and the second circumferential reinforcing portion 57t). Therefore, a situation in which the radially inner reinforcing portion 57u interferes with the second drive gear 97 does not occur.

[Modification 2 of Embodiment 2]
FIG. 20 is a plan view of rotation restricting portion 55 provided in gear unit 10 according to Modification 2 of Embodiment 2 of the present invention. In the second embodiment, when viewed from the direction of the axis L82, the outer edge of the reinforcing portion 57 is angular at a portion corresponding to the corner of the stopper portion 56. However, in this embodiment, the outer edge is viewed from the direction of the axis L82 as shown in FIG. When the outer edge of the reinforcing portion 57 is bent, the bent portion is a curved line. For this reason, since the stress is less likely to concentrate, the reinforcing portion 57 has a great effect of reinforcing the stopper portion 56.

[Other embodiments]
The above embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, the cold air damper 1 in the above-described embodiment is a damper device for a refrigerator, but is not necessarily limited to a damper device used for a refrigerator.

  In the above embodiment, the case 8 is used as a support member and the bottom plate portion 25 of the case 8 is used as a base portion. However, the present invention is applied to a gear unit that uses a plate-like member or the like as a support member and a part thereof as a base portion. The invention may be applied.

DESCRIPTION OF SYMBOLS 1 ... Cold damper 2 ... Baffle 2B ... Baffle closed position 3 ... Opening part 5 ... Frame 8 ... Case 10 ... Gear unit 20 ... Elastic member 31 ...・ Motor 35 ... second gear (second gear)
36 ... Drive gear (gear)
37 ... Large-diameter gear (spur gear)
37a: Tooth part of the large gear (first tooth part)
37b ... Opposing surface 38 ... Missing gear 38a ... Teeth of the missing gear (second tooth)
39 ... Output gear (fan gear)
41 ... 2nd spindle (2nd spindle)
42, 84 ... pedestal portions 42a, 84a ... placement surface 43 ... third support shaft (support shaft)
45 ... Power feeding cable 47 ... Guide wall 47a ... Guide surface 50 ... Rotation restricting mechanism 51 ... Cylinder part 52 ... Projection part 54 ... Arc groove (groove part)
54a, 54b ... Wall surface part (contact part)
55: Rotation restricting portions 55a, 55b, 55c, 55e, 55f ... Concave surface 56 ... Stopper portion 56a ... Inner peripheral side wall surface 57 ... Reinforcing portions 57a, 57r ... First round Direction reinforcement (circumferential reinforcement)
57b, 57s ... radially outer reinforcing portions 57c, 57t ... second circumferential reinforcing portion (circumferential reinforcing portion)
57d, 57e, 57f ... Raised portions 57g, 57u ... Radial inner reinforcements 59a, 59b ... Degrees 60 ... Arc outer periphery (outer periphery)
60a: outer peripheral surface 60b of the arc-shaped outer peripheral portion ... end surface 68 of the arc-shaped outer peripheral portion ... first teeth 69 ... second teeth 97 ... second drive gear (gear)
560... Side wall 570... Side surface L1, L82... Drive gear (gear) axis

Claims (25)

A spindle projecting from the base of the support member;
A gear that is rotatably supported by the support shaft and transmits a driving force from a driving source;
A rotation restricting mechanism that defines an angular range in which the gear rotates around the axis of the support shaft;
Have
The rotation restricting mechanism is provided on the support member so as to be able to abut on the abutting portion of the gear that is spaced apart from the axis to the outer peripheral side, and on the abutting portion from the front in the rotation direction of the gear. A rotation restricting portion,
The rotation restricting portion protrudes from the base portion in the same direction as the support shaft, and includes a stopper portion having a contact portion that can contact the contact portion on the tip end side. A reinforcing portion comprising a portion protruding outward from a side wall of the stopper portion when viewed from the axial direction at the base portion on the base portion side, and
A side surface of the reinforcing portion has an end opposite to the base portion continuous to the side wall of the stopper portion, and an end on the base portion side continuous to the base portion. unit. In claim 1,
The gear unit according to claim 1, wherein the side surface of the reinforcing portion is a concave curved surface or a slope at an end portion opposite to the base portion. In claim 1 or 2,
A gear unit, comprising: a circumferential reinforcing portion projecting from the side wall of the stopper portion in the circumferential direction around the axis as the reinforcing portion. In claim 3,
The circumferential reinforcing portion has a gear unit characterized in that an end opposite to the base portion is smoothly continuous with the side wall of the stopper portion. In any one of Claims 1-3,
A gear unit comprising, as the reinforcing portion, a radially outer reinforcing portion projecting radially outward from the side wall of the stopper portion and spaced from the support shaft. In claim 5,
In the gear unit, the radially outer reinforcing portion has an end opposite to the base portion smoothly continuous with the side wall of the stopper portion. In any one of claims 1 to 6,
The gear unit is a gear unit characterized in that the contact portion is a plane oriented in the circumferential direction around the axis. In any one of Claims 1-7,
The reinforcing portion is disposed between the end portion on the side opposite to the base portion and the end portion on the base portion side with the support shaft from the base portion facing a side surface in a direction orthogonal to the axial direction. A gear unit comprising a bottom raised portion protruding in the same direction. In any one of Claims 1 to 8,
The base portion includes a pedestal portion that protrudes stepwise in the same direction as the support shaft, and a part of which is a mounting surface on which the gear is mounted;
The support shaft and the stopper portion protrude from the pedestal portion. In claim 9,
At least a part of the reinforcing portion has an end portion on the base portion side that is continuous with the pedestal portion of the base portion. In any one of Claims 1-7,
The reinforcement unit is a gear unit characterized in that the entire side surface is formed as a concave curved surface or a slope. In claim 11,
Since the entire side surface of the reinforcing portion is a concave curved surface, the end portion of the reinforcing portion on the side opposite to the base portion smoothly continues to the side wall of the stopper portion, and the end on the base portion side The gear unit is characterized in that the portion is smoothly continuous with the base portion. In claim 11 or 12,
When viewed from the axial direction, the outer edge of the reinforcing portion has a curved portion at a bent portion. In any one of claims 11 to 13,
The said reinforcement part is formed in the perimeter of the said stopper part including the radial direction inside reinforcement part which protruded in the radial direction inner side where the said spindle is located from the said stopper part, The gear unit characterized by the above-mentioned. In claim 14,
The gear unit characterized in that the radially inner reinforcing portion has a smaller dimension in the axial direction than reinforcing portions other than the radially inner reinforcing portion among the reinforcing portions. In any one of claims 1 to 15,
The gear includes a cylindrical portion into which the support shaft is inserted, and a protruding portion protruding from the cylindrical portion to the outer peripheral side,
A tooth portion is provided on the outer peripheral surface of the protruding portion,
A groove portion extending in a circumferential direction around the axis is provided on a surface of the protruding portion that faces the base portion,
The stopper part is inserted into the groove part on the tip side from the reinforcing part,
The abutment portion is a wall surface portion defining an end in the circumferential direction among inner wall surfaces of the groove portion. In claim 16,
The gear unit, wherein the stopper portion extends in a circumferential direction around the support shaft when viewed from the axial direction. In claim 17,
The said stopper part is a gear unit characterized by the inner peripheral part located in the said spindle side among the said side walls being the circular arc surface centering on the said axis. In any one of claims 1 to 18,
The support member is a case for housing the gear;
The base unit is constituted by a bottom plate portion of the case. In claim 19,
The gear unit is an integrally molded product made of resin including the support shaft and the rotation restricting portion. In claim 19 or 20,
A motor housed in the case as the drive source;
A power supply cable for supplying power to the motor;
A transmission gear that meshes with the gear and transmits the driving force of the motor to the gear;
A transmission gear support shaft that protrudes in the same direction as the support shaft from the bottom plate and rotatably supports the transmission gear;
A gear unit comprising: In claim 21,
The bottom plate portion includes a guide wall that projects in the same direction as the support shaft and guides the power feeding cable in the case,
The rotation restricting portion is provided in an angular range between the transmission gear support shaft and the guide wall around an axis of the support shaft,
The reinforcing portion is continuous with the guide wall,
The gear unit, wherein the guide wall guides the power feeding cable with a guide surface located on a side opposite to the rotation restricting portion. A cold air damper comprising the gear unit according to claim 21 or 22,
A frame in which an opening is formed;
A baffle for opening and closing the opening;
An output gear meshing with the gear;
Have
The baffle is connected to the output gear;
The cold air damper, wherein the baffle is driven by driving the motor. In claim 23,
The gear includes a spur gear having a first gear portion that meshes with the transmission gear and a partial gear having a second gear portion that meshes with the output gear at different positions in the axial direction. And
The output gear is a sector gear,
The toothless gear includes an outer peripheral portion having an outer peripheral surface that is curved along the tooth tip circle on the outer peripheral side of the tooth tip circle of the second tooth portion at a position adjacent to the second tooth portion in the circumferential direction. ,
The outer peripheral portion includes an end surface whose length in the axial direction is shorter than a tooth width of the second tooth portion, and is directed to one side in the axial direction at a position in the middle of the second tooth portion in the axial direction.
The sector gear has a notch at a portion facing the outer peripheral surface, and a first tooth that can enter the inner peripheral side of the tip circle on one side of the end surface in the axial direction, and the first tooth A second tooth that can be brought into contact with the outer peripheral surface when the first tooth enters the inner peripheral side of the tip circle,
When the baffle is disposed at a closed position for closing the opening, the first tooth enters the inner peripheral side of the addendum circle on one side in the axial direction on the end face, and the second tooth is on the outer periphery. A cold air damper, characterized in that the fan gear is prevented from rotating in a direction to open the baffle in contact with a surface. In claim 24,
The baffle includes an elastic member that seals the opening,
The cool air damper, wherein the elastic member elastically deforms by contacting an opening edge of the opening in the frame when the baffle is disposed at the closed position.

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