JP5021421B2 - Clutch mechanism - Google Patents

Description

  The present invention relates to a clutch mechanism suitable for use in, for example, a motor speed reduction unit for releasing the latch of an automobile door.

  For example, a speed reduction unit using a motor as a drive source is used as a mechanism for releasing the latch of an automobile door. In this deceleration unit, when the latch of the automobile door is released, the operation lever of the latch is moved in the release direction by the electric motor.

  When the release operation is completed, the motor is stopped and the operation lever is returned to the original position by the urging force of a torsion spring or the like provided in the latch mechanism. At this time, the output shaft of the speed reduction unit connected to the operation lever must be in a state where it can freely rotate by being disconnected from the input shaft so that the operation lever can return to its original position. As a mechanism for enabling such an operation, a clutch mechanism is disposed between the input shaft and the output shaft of the speed reduction unit.

As the conventional clutch mechanism, a so-called one-way clutch that supports only one-way rotation is used (see, for example, Patent Documents 1 and 2). On the other hand, automobile doors are usually provided on both the left and right sides. For this reason, the clutch mechanism also requires two types of clutch mechanisms corresponding to the left-right symmetry, that is, corresponding to the motor rotation input in the opposite direction.
JP 2004-150528 A (FIGS. 2 to 9) JP 2004-150529 A (FIGS. 2 to 9)

  As described above, for example, as a conventional clutch mechanism used in a motor speed reduction unit or the like for releasing the latch of an automobile door, a one-way clutch that supports only one-way rotation is used. At the same time, since the doors of automobiles are usually provided on both the left and right sides, the clutch mechanisms are also symmetrical in the left-right direction, that is, two types of clutch mechanisms corresponding to motor inputs in opposite directions are required.

  For this reason, although it is the same clutch mechanism, it is necessary to prepare two kinds of parts for some parts, for example, a clutch spring, a C-shaped spring, etc., resulting in a significant increase in cost. There is.

  Further, there are two types of the same parts as described above, and problems such as complicated parts management and assembly errors are also generated.

  On the other hand, using a conventional one-way clutch, it is considered possible to form a motor speed reduction unit corresponding to bidirectional rotation input. In this case, however, the motor speed reduction unit becomes larger, for example, a motor speed reduction of a latch of an automobile door. There is a problem that it cannot be used for a unit that requires a reduction in size and weight, such as a unit. In addition, there is a concern that the overall structure of the deceleration unit (embedded device) becomes extremely complicated, resulting in high costs.

The present invention has been made to solve such a problem, and can be used for a bidirectional rotation input with a simple configuration, thereby greatly reducing the cost and downsizing the embedded device. It is an object to provide a clutch mechanism that can solve problems such as complicated parts management and assembly errors at the same time.

  In order to solve the above-mentioned problems, the means employed by the present invention includes a holder fixed to the mounted body, a first C-shaped spring locking portion formed in a C shape and spaced in the circumferential direction. A C-shaped spring having a second C-shaped spring locking portion and disposed so as to be non-rotatable in the circumferential direction when the diameter is expanded with respect to the holder and to be rotated in the circumferential direction when the diameter is reduced. A first connecting wheel locking portion that is freely disposed and locked to the first C-shaped spring locking portion of the C-shaped spring during forward rotation and a second C-shaped spring locking of the C-shaped spring during reverse rotation A connection wheel having a second connection wheel locking portion that is locked to the portion, an input wheel that receives rotational force from the outside and rotates coaxially with the connection wheel, and a connection wheel and an input wheel that are formed in a coil shape Coaxial with A clutch spring mounted, a switching unit fixed to the connecting wheel and rotating integrally with the connecting wheel, an output wheel arranged coaxially and rotatably with respect to the input wheel and outputting a rotational force to the outside In the clutch mechanism including the connecting wheel, the connecting wheel has a third connecting wheel locking portion and a fourth connecting wheel locking portion, and the input wheel has the first input wheel locking portion and the second input wheel locking portion. The clutch spring is locked to the third connecting wheel locking portion of the connecting wheel during forward rotation and locked to the first input wheel locking portion of the input wheel during reverse rotation. And a second clutch sp that is locked to the second input wheel locking portion of the input wheel during forward rotation and locked to the fourth connection wheel locking portion of the connection wheel during reverse rotation. The switching unit is operated by the rotational force when the rotational force is input from the outside to the input wheel and transmits the rotational force input to the input wheel to the output wheel to transmit the rotational force to the outside. And when the rotational force is no longer input to the input wheel, the output wheel is rotated by the spring force of the clutch spring. Here, the above-mentioned forward and reverse rotations do not mean a specific rotation direction, but merely mean rotations in opposite directions.

  According to the clutch mechanism of the present invention, the C-shaped spring has a locking portion that can be locked to the connecting wheel during forward and reverse rotation, and the clutch spring is also engaged with the connecting wheel and the input wheel during forward and reverse rotation. It has the latching | locking part which can be stopped. At the same time, when a rotational force is input from the outside to the input wheel, the switching unit is operated by this rotational force and transmits the rotational force input to the input wheel to the output wheel to output the rotational force to the outside. . Therefore, the rotational force input to the input wheel is output from the output wheel during both forward and reverse rotations.

  On the other hand, when the rotational force is no longer input to the input wheel, the switching unit is operated by the spring force of the clutch spring to make the output wheel rotatable with respect to the input wheel. Thus, the clutch mechanism of the present invention can be used for bidirectional rotational input. Further, the number of parts of the entire apparatus in which the clutch mechanism is incorporated is reduced and the structure is simplified as compared with the case where the conventional one-way clutch is used to cope with bidirectional rotational input.

  For example, the switching part has a claw part that can move in the radial direction or parallel to the radial direction, and the output wheel has an output wheel locking part for locking with the claw part of the switching part. Is moved by the rotational force of the input wheel and is engaged with the output wheel engaging portion of the output wheel to transmit the rotational force to the output wheel. Here, the above-mentioned radial direction means a direction perpendicular to the axis of the clutch mechanism (the same applies hereinafter).

The switching part is formed in a short cylindrical shape, and the claw part can protrude from the outer peripheral part, and the output wheel has an inner short cylindrical concave part, and the concave part freely fits on the outer peripheral part of the switching part and is rotatable. And an output wheel locking portion formed in a concave shape on the inner peripheral portion of the concave portion, and the claw portion protrudes from the outer peripheral portion of the switching portion by the rotational force of the input wheel and becomes an output wheel locking portion of the output wheel. It is desirable to lock. In this way, the entire clutch mechanism can be extremely miniaturized.

  The claw portion of the switching portion has a locking pin that extends in the axial direction and locks to the input wheel, and the locking pin transmits the rotational force of the input wheel to the claw portion when the input wheel rotates, and the claw portion It is desirable to move the part. If it does in this way, a claw part can be moved using the torque of an input wheel.

  It is desirable that the claw portion of the switching portion protrudes from the outer peripheral portion at an angle of 90 ° or less with respect to the rotation direction of the switching portion and is locked to the output wheel locking portion of the output wheel. In this way, the switching portion and the output wheel are securely locked.

  As for the nail | claw part of the said switching part, it is desirable to arrange | position the several which operate | move simultaneously. In this way, the switching portion and the output wheel are more securely locked.

  The connection wheel has a connection wheel rib extending in the axial direction, and the connection wheel rib has one end in the circumferential direction forming a third connection wheel locking portion and the other end in the circumferential direction is a fourth connection wheel locking portion. The input wheel has an input wheel rib extending in the axial direction, and the input wheel rib has a first input wheel locking portion at one circumferential end and a second input wheel at the other circumferential end. A locking portion is formed, and the connecting wheel rib of the connecting wheel and the input wheel rib of the input wheel are relative to each other between the first clutch spring locking portion and the second clutch spring locking portion of the clutch spring and in the circumferential direction. It is desirable to be movably interposed. In this way, the arrangement structure of the connection wheel and the input wheel can be extremely miniaturized.

  The connection wheel has a cutout portion extending in the circumferential direction in the outer peripheral portion, and the cutout portion forms a first connection wheel locking portion at one end in the circumferential direction and a second connection wheel lock at the other end in the circumferential direction. It is desirable to form the part. If it does in this way, the arrangement structure of a connection wheel, a C-shaped spring, and a holder can be remarkably miniaturized.

A clutch mechanism according to the present invention includes a holder fixed to a mounted body, a first C-shaped spring locking portion and a second C-shaped spring locking portion which are formed in a C shape and are spaced apart in the circumferential direction. A C-shaped spring that is disposed so as to be non-rotatable in the circumferential direction when the diameter is expanded with respect to the holder and is rotatable so as to be rotatable in the circumferential direction when the diameter is reduced. The first coupling wheel latching portion latched to the first C-shaped spring latching portion of the C-shaped spring and the second coupling wheel latch latched to the second C-shaped spring latching portion of the C-shaped spring during reverse rotation. A connecting wheel having a stop, an input wheel that receives a rotational force from the outside and rotates coaxially with the connecting wheel, and is formed in a coil shape and is coaxially interposed between the connecting wheel and the input wheel. Clutch spring A switching portion fixed to the connecting wheel and rotating integrally with the connecting wheel; and an output wheel that is coaxially and rotatably arranged with respect to the input wheel and outputs a rotational force to the outside. The third connecting wheel locking portion and the fourth connecting wheel locking portion, the input wheel has the first input wheel locking portion and the second input wheel locking portion, and the clutch spring is A first clutch spring engagement portion that engages with the third connection wheel engagement portion of the connection wheel during rotation and also engages with the first input wheel engagement portion of the input wheel during reverse rotation; And a second clutch spring engaging portion that engages with the fourth connecting wheel engaging portion of the connecting wheel at the time of reverse rotation, and the switching portion is connected to the input wheel from the outside. When the rotational force is input to the clutch, it is actuated by the rotational force to transmit the rotational force input to the input wheel to the output wheel to output the rotational force to the outside, and when the rotational force is not input to the input wheel, the clutch spring Actuated by the spring force of the output wheel to make the output wheel rotatable relative to the input wheel.

  Therefore, it can be used for bidirectional rotation input with a simple configuration, which can greatly reduce the cost and downsize the embedded device, and at the same time, problems such as complicated parts management and assembly errors Can also be solved.

  The best mode for carrying out the clutch mechanism according to the present invention will be described in detail with reference to FIGS.

  FIG. 1 is an external perspective view showing the clutch mechanism of the present invention, FIG. 2 is an assembly view of the clutch mechanism of FIG. 1 as viewed obliquely from above, and FIG. 3 is an assembly view of the clutch mechanism of FIG. 4 is a longitudinal sectional view of the clutch mechanism of FIG. 1, FIG. 5 is an enlarged perspective view of the switching wheel of FIG. 2, FIG. 6 is an enlarged perspective view of the input wheel of FIG. 3, and FIG. 4 is a partial cross-sectional view showing the clutch mechanism as seen from the arrow AA in FIG. 4, FIG. 8 is an enlarged perspective view showing the switching wheel in FIG. 3, and FIG. 9 is the clutch mechanism as seen from the arrow BB in FIG. FIG. 10 is a sectional view showing an operating state different from FIG. 9, and FIG. 11 is a partial longitudinal sectional view showing an attached state of a clutch spring different from FIG.

  As shown in FIGS. 1 to 3, the clutch mechanism 1 includes a holder 10, a C-shaped spring 20, a connection wheel 30, a clutch spring 40, an input gear (input wheel) 50, a switching wheel (switching unit) 60, and an output wheel 70. And the clutch shaft 5 shown in FIG.

  As shown in FIGS. 2 and 4, the holder 10 is fixed to a built-in device of the clutch mechanism 1, for example, a motor speed reduction unit (mounted body) 100 for releasing the latch of the automobile door. The holder 10 is formed in, for example, a short cylindrical shape, and has a concave portion 11 having a circular radial cross section on one end face side. A groove 12 is cut on the outer periphery of the bottom of the concave portion 11 over the entire circumference. An opening 10 a is provided at the center of the recess 11, and the opening 10 a fits the bearing boss 101 of the motor speed reduction unit 100 as shown in FIG. 4.

  As shown in FIGS. 2 and 3, the C-shaped spring 20 is literally formed into a C-shaped circle using an elastic material. It is bent upward. The bent end portions form a first C-shaped spring locking portion 21 and a second C-shaped spring locking portion 22.

  As shown in FIG. 4, the C-shaped spring 20 is formed by narrowing the space between the first C-shaped spring locking portion 21 and the second C-shaped spring locking portion 22 against the spring force, thereby 10 can be fitted into the groove 12 of the recess 11 and if it is opened and expanded in diameter, it is accommodated in the groove 12 of the holder 10 so as not to rotate in the circumferential direction by the spring force.

  That is, the C-shaped spring 20 is formed in a slightly larger diameter than the groove 12 of the holder 10 in the open state, and becomes non-rotatable in the circumferential direction in the groove 12 of the concave portion 11 of the holder 10 when the diameter is increased, and the diameter is reduced. Sometimes it is possible to rotate in the circumferential direction within the groove 12 of the recess 11. Note that the first C-shaped spring locking portion and the second C-shaped spring locking portion are not necessarily provided at both ends of the C-shaped spring 20 as long as they are arranged at intervals in the circumferential direction.

As shown in FIG. 5, the connecting wheel 30 includes a disk-shaped base 31, a rotating shaft 35 that protrudes from the base 31 in the axial direction (upward in the drawing), a guide rib 36, and a connecting wheel rib 3.
7. The base 31 has a notch 32 extending in the circumferential direction on the outer periphery, and the notch 32 has one end in the circumferential direction serving as the first connecting wheel locking portion 32a and the other end serving as the second connecting wheel. Stop portions 32b are formed respectively.

  The base 31 has two guide holes 33 formed on both sides of the rotation shaft 35. A guide rib 55 of the input gear 50 described later is inserted into the guide hole 33. The guide hole 33 is formed longer in the circumferential direction than the guide rib 55 so that the guide rib 55 of the input gear 50 can move by a certain distance in the circumferential direction.

  The hollow rotating shaft 35 has a cylindrical shape with respect to the base portion 35a and a hexagonal column shape with a smaller diameter than the base portion 35a with respect to the tip portion 35b. The guide rib 36 of the connecting wheel 30 is formed in an arc shape whose radial cross section is coaxial with the rotation shaft 35 and extends in the circumferential direction.

  The connecting wheel rib 37 extends in the axial direction, and its radial cross section is formed in an arc shape coaxial with the rotating shaft 35, one end in the circumferential direction forms a third connecting wheel locking portion 37 a, and the other end Forms the fourth connecting wheel locking portion 37b.

  As shown in FIG. 4, the connecting wheel 30 formed in this way is rotatably attached with the rotating shaft 35 inserted through the fixed clutch shaft 5 fitted to the bearing boss 101 of the motor speed reduction unit 100. It is done.

  Further, the first C-shaped spring locking portion 21 and the second C-shaped spring locking portion 22 of the C-shaped spring 20 shown in FIG. It is interposed between the first connecting wheel locking portion 32a and the second connecting wheel locking portion 32b. By adopting such a configuration, the arrangement structure of the holder 10, the C-shaped spring 20, and the connecting wheel 30 can be extremely miniaturized.

  As shown in FIGS. 2 and 3, the clutch spring 40 is formed of a coiled spring and has an inner diameter that is slightly larger than an outer diameter of a rotation shaft 51 of an input gear 50 described later. A first clutch spring locking portion 41 is formed at one end of the clutch spring 40, and a second clutch spring locking portion 42 is formed at the other end.

  The first clutch spring locking portion 41 and the second clutch spring locking portion 42 are formed by bending both ends of the clutch spring 40 outward in the radial direction. However, the first clutch spring engaging portion and the second clutch spring engaging portion are not necessarily provided at both ends of the clutch spring.

  As shown in FIG. 6, the input gear 50 is formed of a worm wheel and can mesh with a worm attached to a motor shaft of an external motor (not shown). A hollow rotary shaft 51 is disposed at the center of the input gear 50, and as shown in FIG. 4, the rotary shaft 51 is inserted into the base portion 35 a of the rotary shaft 35 of the connecting wheel 30, and The rotary shaft 35 is freely rotatable.

  The rotating shaft 51 projects cylindrically toward the connecting wheel 30 (downward in the drawing). As shown in FIG. 2, on the end face 50a of the connecting wheel 30 on the input gear 50 side (the upper side in the drawing), two locking holes 56 (input wheel locking portions) that are oblong in the radial direction are formed on the diameter. Are arranged so as to sandwich the axis.

As shown in FIG. 6, the input gear rib formed on the end surface 50 b of the input gear 50 on the side of the connecting wheel 30 in the axial direction and whose radial cross section is coaxial with the rotary shaft 51. An (input wheel rib) 52 and two guide ribs 55 are projected. One end of the input gear rib 52 in the circumferential direction forms a first input wheel locking portion 53, and the other end forms a second input wheel locking portion 54.

  As shown in FIG. 4, the input gear 50 is assembled by inserting a rotation shaft 51 of the input gear 50 into a base portion 35 a of the rotation shaft 35 of the connection wheel 30 and two guide ribs 55. 33 is slidably inserted in the circumferential direction. Further, the above-described clutch spring 40 is attached between the rotation shaft 51 of the input gear 50 and the guide rib 36 of the connecting wheel 30.

  As shown in FIG. 7, the connecting wheel rib 37 of the connecting wheel 30 and the input gear rib 52 of the input gear 50 are connected to the first clutch spring engaging portion 41 and the second clutch spring engaging portion 42 of the clutch spring 40. It is inserted between.

  As described above, the connection wheel rib 37, the input gear rib 52, the first clutch spring locking portion 41 and the second clutch spring locking portion 42 are arranged together in one place, so that the connection wheel 30 and the input are input. The arrangement structure of the wheel 50 can be extremely miniaturized. Further, since the connecting wheel rib 37 of the connecting wheel 30 and the input gear rib 52 of the input gear 50 are disposed with a gap therebetween, they can be relatively moved in the circumferential direction.

  As shown in FIG. 8, the switching wheel 60 is formed in a short columnar shape, and a shaft hole 61 having a hexagonal cross section in the radial direction is provided at the center thereof. As shown in FIGS. 8 and 9, two (a plurality of) claw holes 62 are drilled in parallel to the radial direction, that is, in parallel to each other across the shaft hole 61, both of which are switching wheels 60. It penetrates to the outer peripheral part. The claw hole 62 is formed in a straight line and has a rectangular cross section perpendicular to the axis of the claw hole 62.

  On the input wheel 50 side of the switching wheel 60 (downward in the drawing), guide holes 63 extending along the above-described claw holes 62 and penetrating to the claw holes 62 are respectively formed. Square columnar claw portions 65 are slidably inserted into the claw holes 62 of the switching wheel 60, respectively. The claw portion 65 is formed to have substantially the same length as the claw hole 62 of the switching wheel 60, and both end portions 66 are formed to be substantially flush with the outer peripheral surface of the switching wheel 60.

  Locking pins 67 are press-fitted into the claw portion 65 on the input wheel 50 side (lower side in the figure). As shown in FIG. 4, the switching wheel 60 is fitted into the tip portion 35 b of the rotation shaft 35 of the connection wheel 30 described above and rotates integrally with the connection wheel 30. At this time, the head portion of the locking pin 67 press-fitted into the claw portion 65 of the switching wheel 60 is inserted into the locking hole 56 of the input gear 50 described above.

  As shown in FIG. 3, the output wheel 70 includes a short cylindrical base 71 and a hollow output shaft 72 extending from the base 71 to the outside. A gear 73 is formed at the tip of the output shaft 72 and can mesh with an external gear (not shown) to output a rotational force.

  An inner short cylindrical recess 74 is formed on the switching wheel 60 side (lower side in the drawing) of the base 71 of the output wheel 70, and four output wheel locking portions 75 are provided around the inner periphery of the recess 74. It is recessed with a gap in the direction. As shown in FIG. 4, in the output wheel 70, the output shaft 72 is rotatably inserted into the clutch shaft 5, and the recess 74 is loosely fitted to the outer peripheral portion of the switching wheel 60, and is coaxial with the switching wheel 60. It is freely rotatable.

As shown in FIG. 9, when the claw portion 65 of the switching wheel 60 is protruded from the outer peripheral portion of the switching wheel 60, the end portion 66 of the claw portion 65 is brought into contact with the output wheel locking portion 75 in the recess 74 of the output wheel 70. Each can be locked.

  Next, the operation of the clutch mechanism 1 will be described.

  When no rotation is input from the outside to the input gear 50, the end portions 66 of the claw portions 65 of the two switching wheels 60 are substantially flush with the outer peripheral surface of the switching wheel 60 as shown in FIG. 9. As described above, the switch wheel 60 is accommodated in the claw hole 62. For this reason, the output gear 70 is rotatable with respect to the switching wheel 60.

  Therefore, when the clutch mechanism 1 is used, for example, in a motor speed reduction unit for releasing the latch of the automobile door, when the release of the operation lever by the electric motor is completed, the torsion spring or the like provided in the latch mechanism The operating lever can be returned to the original position by the urging force.

  As shown in FIG. 2, when a rotation in the CW (forward rotation) direction, for example, is input to the input gear 50 from the outside, the second input wheel engagement of the input gear rib 52 of the input gear 50 is shown in FIG. The stop portion 54 is engaged with the second clutch spring engagement portion 42 of the clutch spring 40, and the first clutch spring engagement portion 41 of the clutch spring 40 is engaged with the third connection wheel engagement of the connection wheel rib 37 of the connection wheel 30. Locks to the portion 37a. Thereby, the rotational force in the CW direction is also transmitted to the connecting wheel 30 via the clutch spring 40.

  At the same time, as shown in FIG. 2, the first connection wheel locking portion 32 a of the notch 32 of the connection wheel 30 is locked to the first C-shaped spring locking portion 21 of the C-shaped spring 20, A rotational force in the CW direction, that is, a force for reducing the diameter of the C-shaped spring 20 is applied to the cylindrical spring 20.

  However, at the initial stage when the rotational force in the CW direction is applied, the C-shaped spring 20 is still unable to rotate due to the frictional force acting between the groove 12 of the concave portion 11 of the holder 10. For this reason, the connection wheel 30 cannot rotate in the CW direction, and the switching wheel 60 integrated with the connection wheel 30 does not rotate in the CW direction.

  As shown in FIG. 7, when the rotational force in the CW direction is applied to the clutch spring 40, the input gear 50 is slightly rotated in the CW direction. Accordingly, the two locking pins 67 of the claw portion 65 of the switching wheel 60 are locked in the locking holes 56 of the input gear 50 as shown in FIG. Then, it moves in the CW direction along the guide hole 63 of the switching wheel 60 to move the two claw portions 65 in the opposite directions in the claw hole 62.

  Thereby, the end portion 66 of each claw portion 65 protrudes from the outer peripheral surface of the switching wheel 60 and is locked to the output wheel locking portion 75 provided on the base portion 71 of the output wheel 70. As a result, the input gear 50, the switching wheel 60 locked to the input gear 50 by the locking pin 67, and the claw portion 65 locked to the switching wheel 60 against the rotational force in the CW direction. The output wheel 70 and the connecting wheel 30 integrated with the switching wheel 60 are integrated with each other so as not to rotate.

  Thereby, the rotational force in the CW direction with respect to the input gear 50 is directly transmitted to the C-shaped spring 20 via the connecting wheel 30, and the diameter of the C-shaped spring 20 is further reduced.

  In such a state, the input gear 50, the connection wheel 30, the switching wheel 60, and the output wheel 70 that are already integrated with each other have a frictional force that is acting between the C-shaped spring 20 and the groove 12 of the holder 10. Against this, it starts to rotate in the CW direction together with the C-shaped spring 20. As a result, the rotation in the CW direction input to the input gear 50 is transmitted to the output wheel 70 and output to the outside.

  Next, when the rotation in the CW direction input to the input gear 50 from the outside stops, first, the input gear 50 and the input gear 50 are integrated by the frictional force between the C-shaped spring 20 and the groove 12 of the holder 10. The rotation of the connecting wheel 30, the switching wheel 60, and the output wheel 70 in the CW direction is also stopped.

  Along with this, the input gear 50 is slightly rotated in the CCW direction by the rewinding force of the clutch spring 40. This is possible, for example, by providing a slight advance angle enough to allow the input gear 50 to rotate in reverse on the worm side (not shown) meshing with the input gear 50.

  When the input gear 50 rotates in the CCW direction, the two locking pins 67 locked in the locking holes 56 of the input gear 50 also move in the CCW direction and in the guide holes of the switching wheel 60 as shown in FIG. 63, the two claw portions 65 are moved toward the center in the claw hole 62, and the end 66 of the claw portion 65 is substantially flush with the outer peripheral surface of the switching wheel 60. Pull back to the position.

  As a result, the output gear 70 is rotatable with respect to the switching wheel 60. Further, the spring forces of the C-shaped spring 20 and the clutch spring 40 are respectively set so that such an operation can be obtained in the clutch mechanism 1.

  On the other hand, when a rotational force in the CCW (reverse rotation) direction is input to the input gear 50 from the outside, the first input wheel locking portion 53 of the input gear rib 52 of the input gear 50 is, as shown in FIG. The clutch spring 40 is engaged with the first clutch spring engagement portion 41, and the second clutch spring engagement portion 42 of the clutch spring 40 is engaged with the fourth connection wheel engagement portion 37 b of the connection wheel rib 37 of the connection wheel 30. Stop.

  As shown in FIG. 2, the second connecting wheel locking portion 32 b of the notch 32 of the connecting wheel 30 is locked to the second C-shaped spring locking portion 22 of the C-shaped spring 20, and the C-shaped spring 20. In contrast, a rotational force in the CW direction, that is, a force for reducing the diameter of the C-shaped spring 20 is applied.

  As shown in FIG. 4, the two locking pins 67 of the claw portion 65 of the switching wheel 60 locked in the locking hole 56 of the input gear 50 are directed in the CCW direction along the guide hole 63 of the switching wheel 60. The two claw portions 65 are moved in the claw holes 62 in the opposite directions to the above-described normal rotation. Others are the same as those in the above-described forward rotation, and thus description thereof is omitted.

  According to the clutch mechanism 1 described above, the C-shaped spring 20 has the locking portions 21 and 22 that can be locked to the connecting wheel 30 during forward and reverse rotation, and the clutch spring 40 is also connected during forward and reverse rotation. Locking portions 41 and 42 that can be locked to the wheel 30 and the input wheel 50 are provided.

At the same time, when a rotational force is input from the outside to the input wheel 50, the switching wheel 60 is operated by this rotational force and transmits the rotational force input to the input wheel 50 to the output wheel 70 to generate the rotational force. Output to the outside. Therefore, for both forward and reverse rotations,
The rotational force input to the input wheel 50 is output from the output wheel 70.

  Further, the switching wheel 60 is actuated by the spring force of the clutch spring 40 when the rotational force is no longer input to the input wheel 50, thereby making the output wheel 70 rotatable with respect to the input wheel 50.

  Thus, the clutch mechanism 1 can be used for bidirectional rotation input, and the clutch mechanism is more effective than the case where the conventional one-way clutch is used to cope with bidirectional rotation input. As a result, the number of parts of the entire apparatus into which the device is incorporated can be reduced, and the structure can be simplified. Therefore, significant cost reduction and downsizing of the embedded device can be achieved, and at the same time, problems such as complicated parts management and assembly errors can be solved.

  Further, by making the shapes of the switching wheel 60 and the output wheel 70 and their incorporation forms as described above, the entire clutch mechanism can be extremely miniaturized. Furthermore, the claw part 65 can be moved using the rotational force of the input wheel 50 by making the structure for operating the claw part 65 of the switching wheel 60 as mentioned above.

  On the other hand, as shown in FIG. 10, the claw portion 65 of the switching wheel 60 has a tip 66 protruding from the outer peripheral portion at an angle of 90 ° or less with respect to the rotation direction of the switching wheel 60, and the output wheel engagement of the output wheel 70. Since the locking portion 75 is locked, the switching wheel 60 and the output wheel 70 are reliably locked. In addition, since the two claw portions 65 of the switching wheel 60 are disposed, the switching wheel 60 and the output wheel 70 are more reliably locked.

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible, and it goes without saying that the present invention is not excluded from the scope of the present invention. For example, the clutch mechanism of the present invention is not necessarily limited to the motor speed reduction unit for releasing the latch of the automobile door, and can be used for any device.

  Further, as shown in FIG. 4, the clutch spring is not attached to the outside of the rotation shaft of the input gear, but the clutch spring 81 is attached to the outside of the rotation shaft 83 of the connecting wheel 82 as shown in FIG. Also good.

It is an external appearance perspective view which shows the clutch mechanism of this invention. It is the assembly figure which looked at the clutch mechanism of FIG. 1 from diagonally upward. It is the assembly figure which looked at the clutch mechanism of Drawing 1 from the slanting lower part. It is a longitudinal cross-sectional view of the clutch mechanism of FIG. It is an expansion perspective view which shows the switching wheel of FIG. It is an expansion perspective view which shows the input wheel of FIG. It is a fragmentary sectional view which shows the clutch mechanism seen from the arrow AA of FIG. It is an expansion perspective view which shows the switching wheel of FIG. It is sectional drawing which shows the clutch mechanism seen from the arrow BB of FIG. It is sectional drawing which shows the operation state different from FIG. It is sectional drawing which shows the attachment state of the clutch spring different from FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clutch mechanism 5 Clutch shaft 10 Holder 10a Opening part 11 Recess 12 Groove 20 C-shaped spring 21 1C-shaped spring locking part 22 2C-shaped spring locking part 30 Connecting wheel 31 Base 32 Notch part 32a First Connecting wheel locking portion 32b Second connecting wheel locking portion 33 Guide hole 35 Rotating shaft 35a Base portion 35b Tip portion 36 Guide rib 37 Connecting wheel rib 37a Third connecting wheel locking portion 37b Fourth connecting wheel locking portion 40 Clutch spring 41 First clutch spring locking portion 42 Second clutch spring locking portion 50 Input gear (input wheel)
50a End surface 50b End surface 51 Rotating shaft 52 Input gear rib (input wheel rib)
53 First input wheel locking portion 54 Second input wheel locking portion 55 Guide rib 56 Locking hole (input wheel locking portion)
60 switching wheel (switching part)
61 Shaft hole 62 Claw hole 63 Guide hole 65 Claw portion 66 End portion 67 Locking pin 70 Output wheel 71 Base 72 Output shaft 73 Gear 74 Recess 75 Output wheel locking portion 81 Clutch spring 82 Input gear (input wheel)
83 Rotating shaft 100 Motor reduction unit 101 Bearing boss

Claims (8)

  A holder (10) fixed to the mounted body, a first C-shaped spring locking portion (21) and a second C-shaped spring locking portion (22) formed in a C-shape and spaced apart in the circumferential direction And a C-shaped spring (20) disposed so as to be non-rotatable in the circumferential direction when the diameter is expanded with respect to the holder and rotatably arranged in the circumferential direction when the diameter is reduced. And the second C-shape of the C-shaped spring at the time of reverse rotation with the first coupling wheel locking portion (32a) that is provided and is locked to the first C-shaped spring locking portion of the C-shaped spring at the time of forward rotation. A connecting wheel (30) having a second connecting wheel locking portion (32b) locked to the spring-like spring locking portion, and an input wheel (50) that receives a rotational force from the outside and rotates coaxially with the connecting wheel. ) And coiled A clutch spring (40) coaxially interposed between the connecting wheel and the input wheel, a switching unit (60) fixed to the connecting wheel and rotating integrally with the connecting wheel, and the input wheel In the clutch mechanism (1) including an output wheel (70) that is coaxially and rotatably disposed with respect to the output wheel and outputs the rotational force to the outside, the connection wheel includes a third connection wheel locking portion. (37a) and a fourth connecting wheel locking portion (37b), and the input wheel has a first input wheel locking portion (53) and a second input wheel locking portion (54), The clutch spring is engaged with the third connection wheel engagement portion of the connection wheel during the forward rotation and is engaged with the first input wheel engagement portion of the input wheel during the reverse rotation. A first clutch spring locking portion (41) that is locked to the second input wheel locking portion of the input wheel during the forward rotation and the fourth connection wheel locking portion of the connection wheel during the reverse rotation. A second clutch spring locking portion (42) for locking to the input wheel, and when the rotational force is input from the outside to the input wheel, the switching portion is operated by the rotational force and input to the input wheel. The rotational force transmitted is transmitted to the output wheel to output the rotational force to the outside, and when the rotational force is no longer input to the input wheel, the output wheel is actuated by the spring force of the clutch spring. A clutch mechanism characterized by being rotatable with respect to an input wheel.   The switching part (60) has a claw part (65) movable in the radial direction or parallel to the radial direction, and the output wheel (70) is an output for locking with the claw part of the switching part. A wheel locking portion (75), and the claw portion is moved by the rotational force of the input wheel (50) and locked to the output wheel locking portion of the output wheel. The clutch mechanism according to claim 1, wherein the clutch mechanism is transmitted to an output wheel.   The switching portion (60) is formed in a short cylindrical shape, and the claw portion (65) can protrude from an outer peripheral portion, and the output wheel (70) has an inner short cylindrical concave portion (74). The concave portion is loosely fitted to the outer peripheral portion of the switching portion and is rotatable, and has the output wheel locking portion (75) formed in a concave shape on the inner peripheral portion of the concave portion. 3. The clutch mechanism according to claim 2, wherein the clutch is protruded from the outer peripheral portion of the switching portion by the rotational force of the input wheel (50) and is locked to the output wheel locking portion of the output wheel.   The claw portion (65) of the switching portion (60) has a locking pin (67) that extends in the axial direction and locks to the input wheel (50). 4. The clutch mechanism according to claim 2, wherein when rotating, the rotational force of the input wheel is transmitted to the claw portion to move the claw portion. 5.   The claw portion (65) of the switching portion (60) protrudes from the outer peripheral portion at an angle of 90 ° or less with respect to the rotation direction of the switching portion, and the output wheel locking portion ( 75) The clutch mechanism according to any one of claims 2 to 4, wherein the clutch mechanism is engaged with the clutch mechanism.   The clutch mechanism according to any one of claims 2 to 5, wherein a plurality of the claw portions (65) of the switching portion (60) that operate simultaneously are disposed.   The connection wheel (30) has a connection wheel rib (37) extending in the axial direction, and the connection wheel rib forms a third connection wheel locking portion (37a) at one end in the circumferential direction and the other in the circumferential direction. An end portion forms the fourth connecting wheel locking portion (37b), the input wheel (50) has an input wheel rib (52) extending in the axial direction, and the input wheel rib has one end in the circumferential direction. Forms the first input wheel locking part (53) and the other circumferential end forms the second input wheel locking part (54), the connection wheel rib of the connection wheel and the input wheel of the input wheel. The input wheel rib is relatively movable in the circumferential direction between the first clutch spring locking portion (41) and the second clutch spring locking portion (42) of the clutch spring (40). Clutch mechanism according to any of claims 1, characterized in that it is interposed 6.   The connecting wheel (30) has a notch (32) extending in the circumferential direction on the outer peripheral portion, and one end in the circumferential direction of the notch forms the first connecting wheel locking portion (32a). The clutch mechanism according to any one of claims 1 to 7, wherein the other end portion in the direction forms the second connecting wheel locking portion (32b).

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