Electric motor with reverse input cut clutch

Abstract

A configuration of an electric motor with a reverse input cut-off clutch that is easy to miniaturize. An output rotary shaft (2) is configured by connecting a first rotary shaft (22) and a second rotary shaft (23) that are coaxially arranged with each other using a reverse input cut-off clutch (20). The second rotary shaft (23) is supported on the axial one side of the end portion located on the opposite side of the first rotary shaft (22) across a gear portion (30) in the axial direction so as to be rotatable relative to a fixed portion (34) using a bearing device (3). The reverse input cut-off clutch 20 has a function of transmitting torque input to the first rotary shaft (22) to the second rotary shaft (23) if torque is input to the first rotary shaft (22), and completely cutting off torque input to the second rotary shaft (23) in the reverse direction so as not to be transmitted to the first rotary shaft (22), or transmitting a part of the torque to the first rotary shaft (22) and cutting off the remaining part if torque is input to the second rotary shaft (23) in the reverse direction.

Description

Technical Field

[0001] This invention relates to an electric motor equipped with a reverse input cut-off clutch. Background Technology

[0002] In electric actuators used in electric doors, power windows in automobiles, etc., an electric motor is used as the drive source. Based on the rotational force of this electric motor, the displacement of components such as doors and windows is achieved. In such electric actuators, the position of the displacement component must be maintained, regardless of the force acting on the component, such as the weight of the window itself. Even when the component is not being displaced, if the electric motor is energized to exert rotational force, the position of the displacement component can be maintained regardless of the force acting on it, but this is disadvantageous from an energy-saving perspective. If the worm gear reducer that slows down the rotational force of the electric motor has a self-locking function, the position of the displacement component can be maintained even when the power to the electric motor is stopped. However, because the positive efficiency of the electric actuator is reduced, a larger electric motor is required, potentially increasing the overall size of the device.

[0003] Japanese Patent Application Publication No. 2007-16878 discloses a structure of an electric actuator having a reverse input cut-off clutch between the output shaft and the lead screw shaft of a parallel-arranged electric motor. The reverse input cut-off clutch functions to transmit torque from the output shaft of the electric motor to the lead screw shaft, while simultaneously cutting off torque from the lead screw shaft from transmission to the output shaft. Therefore, in the electric actuator disclosed in Japanese Patent Application Publication No. 2007-16878, the position of the nut disposed around the lead screw shaft can be maintained without energizing the electric motor.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2007-16878 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, in the electric actuator described in Japanese Patent Application Publication No. 2007-16878, the input and output components of the reverse input cut-off clutch are configured parallel to the output shaft of the electric motor. Therefore, in addition to the bearings required to support the output shaft of the electric motor so that it can rotate freely relative to the housing, separate bearings are also needed to support the input and output components of the reverse input cut-off clutch so that they can rotate freely. Therefore, there is room for improvement in miniaturizing the electric actuator.

[0009] In view of the above, the object of the present invention is to provide a structure of an electric motor with a reverse input cut-off clutch that is easy to miniaturize.

[0010] Solution for solving the problem

[0011] The electric motor with a reverse input cut-off clutch of the present invention includes a motor housing, an output rotating shaft, a bearing assembly, a rotor, and a stator.

[0012] The aforementioned output rotating shaft has a first rotating shaft that is rotatably supported inside the motor housing, a second rotating shaft that has a torque output section in the axial middle portion and is coaxially arranged with the first rotating shaft, and a reverse input cut-off clutch that is arranged inside the motor housing and connects the first rotating shaft and the second rotating shaft.

[0013] The aforementioned reverse input cut-off clutch has the following functions: when torque is input to the first rotating shaft, the torque input to the first rotating shaft is transmitted to the second rotating shaft; conversely, when torque is input to the second rotating shaft in the opposite direction, the torque input to the second rotating shaft in the opposite direction is completely cut off, or a portion of the torque input to the second rotating shaft in the opposite direction is transmitted to the first rotating shaft and the remaining portion is cut off.

[0014] The bearing device is externally embedded in the portion of the second rotating shaft that is axially separated from the torque output portion and located on the opposite side of the first rotating shaft, and the second rotating shaft is rotatably supported in a portion that does not rotate during use.

[0015] The rotor is arranged around the first rotating shaft and rotates integrally with the first rotating shaft.

[0016] The stator is arranged around the rotor and is supported and fixed inside the motor housing.

[0017] In one embodiment of the present invention, an electric motor with a reverse input cut-off clutch can be constructed using radial rolling bearings such as four-point contact type or deep groove single-row radial ball bearings or multi-row angular contact ball bearings.

[0018] In one embodiment of the present invention, an electric motor with a reverse input cut-off clutch,

[0019] The aforementioned reverse input cut-off clutch can have the following characteristics:

[0020] The surface being pressed;

[0021] The input section rotates integrally with the aforementioned first rotating axis;

[0022] An output section, which is coaxially arranged with the input section and rotates integrally with the second rotation axis; and

[0023] The engaging component has a pressing surface facing the pressed surface described above.

[0024] The aforementioned engaging member is configured such that, when torque is input to the input portion, the pressing surface moves away from the pressed surface and engages with the output portion based on the engagement with the input portion; conversely, when torque is input to the output portion in the opposite direction, the pressing surface moves towards the pressed surface based on the engagement with the output portion, and the pressing surface engages with the pressed surface through friction.

[0025] In an electric motor with a reverse input cut-off clutch according to one aspect of the present invention, the input portion may have an input-side engaging portion in a radially offset portion from its rotation center, the output portion may have an output-side engaging portion radially inward of the input-side engaging portion, and the engaging member may have an input-side engaged portion capable of engaging with the input-side engaging portion, and is disposed between the pressed surface and the output-side engaging portion.

[0026] In an electric motor with a reverse input cut-off clutch according to one aspect of the present invention, the aforementioned engaging member can be composed of two engaging members configured to clamp the output-side engaging portion using their respective bottom surfaces.

[0027] In one embodiment of the present invention, an electric motor with a reverse input cut-off clutch,

[0028] The above-mentioned card assembly can have:

[0029] The engaging component body includes the aforementioned pressing surface, an output-side engaging portion that engages with the aforementioned output-side engaging portion, and a swing support portion located closer to the pressing surface than the input-side engaging portion in the direction in which the pressing surface moves near and far relative to the pressed surface; and

[0030] The linkage component has the aforementioned input-side engaging portion and a swing-supported portion that is supported so as to be able to swing relative to the aforementioned swing support portion.

[0031] In one embodiment of the present invention, an electric motor with a reverse input cut-off clutch,

[0032] The above-mentioned card assembly body can have:

[0033] A pair of main body plates, each having a plate-side output engagement portion constituting the aforementioned output-side engagement portion, are axially overlapping and engaged with each other; and

[0034] The swing support shaft, which constitutes the aforementioned swing support portion, has its axial ends supported by the aforementioned pair of main body plates.

[0035] Furthermore, the aforementioned connecting rod components can be positioned between the pair of main body plates.

[0036] The aforementioned snap-fit ​​component can have an intermediate plate that is clamped between the pair of main body plates.

[0037] In an electric motor with a reverse input cut-off clutch according to one aspect of the present invention, the input section can be integrally formed with the first rotating shaft, and the output section can be integrally formed with the second rotating shaft.

[0038] In an electric motor with a reverse input cut-off clutch according to one aspect of the present invention, the motor housing is capable of having the aforementioned pressed surface on its inner circumferential surface.

[0039] In an electric motor with a reverse input cut-off clutch according to one aspect of the present invention, the motor housing may include: a drive section housing the rotor and the stator; and a clutch section housing the reverse input cut-off clutch having an outer diameter smaller than that of the drive section housing. The clutch section may have a pressing surface on its inner circumferential surface and an inner diameter sleeve fitting surface on its outer circumferential surface whose outer diameter does not change axially.

[0040] In an electric motor with a reverse input cut-off clutch according to one aspect of the present invention, one of the first rotating shaft and the second rotating shaft may have a cylindrical rotating shaft recess at the center of its axial end face, and the other of the first rotating shaft and the second rotating shaft may have a rotating shaft protrusion inserted into the inner side of the rotating shaft recess, and the output rotating shaft may have a radial bearing disposed between the inner circumferential surface of the rotating shaft recess and the outer circumferential surface of the rotating shaft protrusion.

[0041] In one embodiment of the present invention, an electric motor with a reverse input cut-off clutch, the torque output section can be composed of a gear section, a pulley section, or a sprocket section.

[0042] The effects of the invention are as follows.

[0043] In one embodiment of the present invention, an electric motor with a reverse input cut-off clutch is constructed by connecting a first rotating shaft and a second rotating shaft that are coaxially arranged with each other using a reverse input cut-off clutch. Therefore, compared with the structure described in Japanese Patent Application Publication No. 2007-16878, it is easier to achieve miniaturization.

[0044] In particular, in an electric motor with a reverse input cut-off clutch according to one embodiment of the present invention, the portion of the second rotating shaft located axially across the torque output section and opposite to the first rotating shaft is supported by a bearing assembly and is freely rotatable relative to the portion that does not rotate even during use. Therefore, it is easy to reduce the axial dimension of the motor housing housing the drive section consisting of the rotor and stator and the reverse input cut-off clutch to a shorter length, and from this perspective, miniaturization is also easily achieved. Attached Figure Description

[0045] Figure 1 This is a cross-sectional view of an electric motor with a reverse input cut-off clutch, illustrating a first example of an embodiment of the present invention.

[0046] Figure 2 yes Figure 1 Enlarged sectional view of the main part.

[0047] Figure 3 This is an exploded perspective view of the first rotating shaft, the second rotating shaft, and the two engaging components that constitute the reverse input cut-off clutch in the first example.

[0048] Figure 4 This is a cross-sectional view showing the reverse input cut-off clutch of the first example.

[0049] Figure 5 This is the first example showing a cross-sectional view of the reverse input disengagement clutch with torque input to the input section.

[0050] Figure 6 This is the first example showing a cross-sectional view of the reverse input disengagement clutch with torque input to the output in the reverse direction.

[0051] Figure 7 From Figure 4 The diagram shown illustrates the reverse input cut-off clutch with the second rotating shaft, the main body plate on one axial side, bolts, and nuts removed.

[0052] Figure 8 yes Figure 7 XX sectional view.

[0053] Figure 9 yes Figure 7 An enlarged view of the upper half of the central part in the left-right direction.

[0054] Figure 10 From Figure 7 The diagram shows the upper part of the device with the middle plate and connecting rod components removed.

[0055] Figure 11 yes Figure 10 YY sectional view.

[0056] Figure 12 This is a perspective view showing the two engaging parts and the force-applying components of the reverse input cut-off clutch in the first example.

[0057] Figure 13 This is a diagram of the two engaging parts and the force-applying components of the reverse input cut-off clutch, as observed from one side of the axial direction in the first example.

[0058] Figure 14 yes Figure 13 Z1-Z2 sectional view.

[0059] Figure 15 yes Figure 13 Z1-O-Z3 sectional view.

[0060] Figure 16 This is an exploded perspective view of the two engaging components of the reverse input cut-off clutch in the first example.

[0061] Figure 17 This is a perspective view of the intermediate plate of the two engaging parts that constitute the reverse input cut-off clutch and the force-applying component in the first example.

[0062] Figure 18 (A) of the first example shows the engagement between the engaging member and the input-side engaging portion in the state before the torque is input to the first rotating shaft. Figure 18 (A) of (b) is shown from Figure 18 The diagram shown in (A) is a representation of the state after the input of torque to the first rotating shaft. Figure 18 (B) (a) is a diagram showing the engagement between the engaging member and the input-side engaging portion in the state before the torque is input to the first rotating shaft, as in the comparative example. Figure 18 (B) of (b) is shown from Figure 18 The diagram shows the state after torque is input to the first rotating shaft, as shown in (B) of (a).

[0063] Figure 19 (A) and Figure 19 (B) is a diagram showing the state of the first example of the reverse input cut-off clutch before and after the output-side engaging part and the output-side engaged part are engaged.

[0064] Figure 20 Is with Figure 2 The same figure shows an electric motor with a reverse input cut-off clutch, a comparative example of the present invention.

[0065] Figure 21 This is a cross-sectional view of a reverse input cut-off clutch, illustrating a second example of an embodiment of the present invention.

[0066] Figure 22This is a perspective view showing the reverse input cut-off clutch in the second example.

[0067] Figure 23 This is a perspective view showing the input section of the reverse input cut-off clutch in the second example.

[0068] Figure 24 This is a perspective view showing the output section of the reverse input cut-off clutch in the second example.

[0069] Figure 25 This is a cross-sectional view of the reverse input disengagement clutch shown in the second example, with torque input to the input section.

[0070] Figure 26 The second example shows a cross-sectional view of the reverse input disengagement clutch in the state where torque is input in the opposite direction to the output.

[0071] Figure 27 This is an enlarged cross-sectional view of the main part of an electric motor with a reverse input cut-off clutch, illustrating a third example of an embodiment of the present invention. Detailed Implementation

[0072] [First Example of Implementation]

[0073] Figures 1 to 19 (B) shows a first example of an embodiment of the present invention. The motor with a reverse input cut-off clutch in this example includes a motor housing 1, an output rotating shaft 2, a bearing assembly 3, a rotor 4, and a stator 5.

[0074] The motor housing 1 includes: a drive section housing 19, which houses the drive section 78 consisting of a rotor 4 and a stator 5; and a clutch housing 21, which houses the reverse input cut-off clutch 20 described below.

[0075] The clutch housing 21 has an outer diameter D that is larger than that of the drive housing 19. 19 Small outer diameter D 21 The clutch housing 21 has a cylindrical concave pressing surface 39 on its inner circumferential surface and a cylindrical convex inner diameter sleeve fitting surface 79 on its outer circumferential surface, the outer diameter of which does not change axially.

[0076] In this example, the motor housing 1 has a first housing element 6 and a second housing element 7.

[0077] The first housing element 6 has a main body 8 and a cover 9.

[0078] The main body 8 includes: a cylindrical portion 10; and an annular portion 11, which extends from one side of the cylindrical portion 10 along its axial direction. Figure 1 The left end of the ring portion 11 is bent radially inward; the cylindrical portion 12 is held so that it extends from the radially inward end of the ring portion 11 toward the axial side ( Figure 1(right side) bend; and protrusion 13, which protrudes circumferentially from the radial middle portion of the axial single side of the annular portion 11 toward the axial single side.

[0079] The cover 9 includes: a circular plate-shaped base plate portion 14 that blocks the opening on the other axial side of the cylindrical portion 10 of the main body portion 8; and a retaining cylindrical portion 15 that protrudes from one axial side of the base plate portion 14. The cover 9 is fixed to the end of the cylindrical portion 10 on the other axial side of the main body portion 8 by means of welding, threaded fastening, or other fixing methods, thereby blocking the opening on the other axial side of the cylindrical portion 10.

[0080] The second housing element 7 includes: a cylindrical portion 16; an inner diameter side annular portion 17, which is bent radially inward from one axial end of the cylindrical portion 16; and an outer diameter side annular portion 18, which is bent radially outward from the other axial end of the cylindrical portion 16.

[0081] In this example, the second housing element 7 is radially positioned relative to the first housing element 6 by fitting the outer peripheral surface of the protrusion 13 of the first housing element 6 into the inner peripheral surface of the cylindrical portion 16 on the other side of the axial direction of the second housing element 7 in a radially non-wobbly manner (sleeve fitting). With the second housing element 7 radially positioned relative to the first housing element 6, the first housing element 6 and the second housing element 7 are joined together by bolts or other connecting components to form the motor housing 1.

[0082] In this example, the motor housing 1 has a drive unit housing 19 for housing the drive unit 78 inside the first housing element 6, and a clutch housing 21 for housing the reverse input cut-off clutch 20 inside the second housing element 7. In other words, the drive unit housing 19 is composed of the cylindrical portion 10 and the annular portion 11 constituting the main body portion 8 of the first housing element 6, and the bottom plate portion 14 of the cover portion 9. The clutch housing 21 is composed of the cylindrical portion 16 and the inner diameter side annular portion 17 constituting the second housing element 7, and the radially inner portion of the annular portion 11 constituting the main body portion of the first housing element 6.

[0083] By fitting the inner diameter sleeve mating surface 79 without wobbling (sleeve fitting) into the cylindrical concave outer diameter sleeve mating surface 80 of the fixed portion 34, which does not rotate when using a housing different from the motor housing 1, the motor housing 1 is positioned relative to the fixed portion 34. With the motor housing 1 positioned relative to the fixed portion 34, the motor housing 1 is supported and fixed relative to the fixed portion 34 using support members such as bolts. Specifically, for example, bolts are inserted into through holes at multiple locations along the circumferential direction of the flange portion, and these bolts are threaded into multiple threaded holes provided in the fixed portion 34, thereby supporting and fixing the motor housing 1 relative to the fixed portion 34. The flange portion protrudes radially outward from the outer peripheral surface of the drive portion receiving portion 19 (cylindrical portion 10).

[0084] The output rotating shaft 2 includes: a first rotating shaft 22, which is rotatably supported inside the motor housing 1; a second rotating shaft 23, which is coaxially arranged with the first rotating shaft 22; and a reverse input cut-off clutch 20, which is arranged inside the motor housing 1 and connects the first rotating shaft 22 and the second rotating shaft 23.

[0085] The first rotating shaft 22 is rotatably supported inside the first housing element 6 of the motor housing 1 by two bearings 24a and 24b. Of the two bearings 24a and 24b, the axially unidirectional bearing 24a is positioned between the inner circumferential surface of the retaining cylindrical portion 12 of the main body 8 and the outer circumferential surface of the axially intermediate portion of the first rotating shaft 22. The axially unidirectional bearing 24b is positioned between the inner circumferential surface of the retaining cylindrical portion 15 of the cover 9 and the outer circumferential surface of the axially unidirectional end of the first rotating shaft 22. Furthermore, in this example, single-row deep groove ball bearings are used as bearings 24a and 24b.

[0086] The first rotating shaft 22 has an input portion 25 for the reverse input cut-off clutch 20 at one end of the axial direction, specifically at a portion located further to the axial direction than the portion with the externally embedded axial bearing 24a, and has a cylindrical rotating shaft recess 26 at the center of the end face of the axial direction.

[0087] The second rotating shaft 23 has an output portion 27 of the reverse input cut-off clutch 20 at its axial end, and a cylindrical rotating shaft protrusion 29 that protrudes axially from the center of the end face on the axial side of the output-side engagement portion 28 of the output portion 27. The second rotating shaft 23 is coaxially configured with the first rotating shaft 22 by fitting (sleeve fitting) the rotating shaft protrusion 29 into the rotating shaft recess 26 of the first rotating shaft 22 in a manner that prevents radial wobble and allows relative rotation.

[0088] The second rotating shaft 23 has a gear portion 30 constituting a torque output portion on its outer peripheral surface at the axial middle portion, and a flange portion 31 protruding radially outward in the portion between the output portion 27 and the gear portion 30 in the axial direction. The gear portion 30 is composed of helical gears, spur gears, etc.

[0089] In this example, the second rotating shaft 23 is formed by externally fixing a cylindrical member 33 with a gear portion 30 on its outer peripheral surface to the axial middle portion of a stepped cylindrical member 32 having an output portion 27, a rotating shaft protrusion 29, and a flange portion 31 in a manner that prevents relative rotation. However, in the implementation of the present invention, the second rotating shaft can also be integrally formed.

[0090] The bearing assembly 3 is externally fitted into the axially unilateral end of the second rotating shaft 23, which is located on the opposite side of the first rotating shaft 22 and is axially separated by the gear portion 30. This axially unilateral end of the second rotating shaft 23 is rotatably supported on the fixed portion 34. In other words, the axially unilateral end of the second rotating shaft 23 is supported by the bearing assembly 3 so that it can rotate freely relative to the fixed portion 34.

[0091] In this example, the bearing assembly 3 is composed of a single-row radial rolling bearing. That is, the bearing assembly 3 has an inner ring 35 externally fitted to one side of the axial end of the second rotating shaft 23, an outer ring 36 fitted into the inner circumferential surface of the fixed portion 34, and balls 37 that are freely disposed between the inner ring 35 and the outer ring 36. Specifically, for example, the bearing assembly 3 can be composed of a four-point contact type or a deep groove single-row radial ball bearing.

[0092] In this example, the second rotating shaft 23 allows its axially unilateral end to be supported by the bearing assembly 3 for free rotation relative to the fixed portion 34, and the rotating shaft protrusion 29 is fitted (sleeve-fitted) into the rotating shaft recess 26 of the first rotating shaft 22 without wobbling. Therefore, in the unlocked state of the reverse input cut-off clutch 20 described below, it can be said that the second rotating shaft 23 allows its axially unilateral end to be rotatably supported on the motor housing 1 via the sleeve-fitted portion of the rotating shaft protrusion 29 and the rotating shaft recess 26, the first rotating shaft 22, and the axially unilateral bearing 24a. However, as explained below, the rotating shaft protrusion and rotating shaft recess can be omitted as long as the coaxiality of the first rotating shaft 22 and the second rotating shaft 23 can be ensured. In summary, in the electric motor with a reverse input cut-off clutch in this example, the axially unilateral portion of the second rotating shaft 23 that is closer to the first rotating shaft 22 than the gear portion 30 is not connected to the motor housing 1 and the fixed portion 34 via other components, and no radial bearing is provided.

[0093] In this example, with the bearing assembly 3 supporting one axial end of the second rotating shaft 23 so that it can rotate freely relative to the fixed portion 34, the output portion 27 and the rotating shaft protrusion 29 of the second rotating shaft 23 are disposed inside the clutch receiving portion 21 in the motor housing 1. In this example, a sealing device 38 is provided between the inner circumferential surface of the inner diameter side annular portion 17 of the second housing element 7 and the outer circumferential surface of the flange portion 31 of the second rotating shaft 23. This seals the portion between the inner circumferential surface of the inner diameter side annular portion 17 and the outer circumferential surface of the flange portion 31, preventing leakage of lubricating grease sealed inside the motor housing 1 and the intrusion of foreign matter from the outside into the inside of the motor housing 1. The sealing device 38 can be, for example, a contact-type sealing ring.

[0094] The reverse input cut-off clutch 20 functions as follows: when torque is input to the first rotating shaft 22, it transmits the torque input to the first rotating shaft 22 to the second rotating shaft 23; and when torque is input to the second rotating shaft 23 in the opposite direction, it completely cuts off the torque input to the second rotating shaft 23 so that it is not transmitted to the first rotating shaft 22, or it transmits a portion of the torque input to the second rotating shaft 23 to the first rotating shaft 22 and cuts off the remaining portion. In this example, the reverse input cut-off clutch 20 is disposed inside the clutch housing 21 (second housing element 7) in the motor housing 1. The detailed construction of the reverse input cut-off clutch 20 will be described below.

[0095] The rotor 4 is configured (embedded) around the axial center of the first rotating shaft 22 in a manner that rotates integrally with the first rotating shaft 22. Furthermore, the rotor 4 can adopt various known structures such as cage-shaped, wound-wire-shaped, and permanent magnet-shaped.

[0096] The stator 5 is coaxially arranged around the rotor 4 and is supported and fixed inside the drive housing 19 in the motor housing 1. Specifically, the inner circumferential surface of the stator 5 faces the outer circumferential surface of the rotor 4 through a radially small gap, and the outer circumferential surface of the stator 5 is supported and fixed to the inner circumferential surface of the cylindrical portion 10 of the main body portion 8 of the first housing element 6. The stator 5 can adopt various known structures such as wound type and permanent magnet type.

[0097] Next, the structure and operation of the reverse input cut-off clutch 20 will be explained.

[0098] <Explanation of the construction of the reverse input cut-off clutch 20>

[0099] The reverse input cut-off clutch 20 includes an input section 25, an output section 27, a pressed surface 39, a locking member 40, and a force-applying member 41.

[0100] The input section 25 is provided on one axial side of the first rotating shaft 22, specifically within the range from the portion where the bearing 24a is externally mounted on the axial side to the end of the axial side. In this example, as... Figure 3 As shown, the input section 25 has an input shaft section 42, an input arm section 43, and an input side engaging section 44.

[0101] The input shaft portion 42 is cylindrical and includes a portion of the first rotating shaft 22 containing a bearing 24a that is externally fitted on one axial side. Furthermore, the input portion 25 also includes a rotating shaft recess 26 that is recessed axially from the center of the end face on one axial side of the input shaft portion 42. That is, in this example, the bearing 24a on one axial side serves both to support the axially oriented portion of the first rotating shaft 22 so that it can rotate freely relative to the motor housing 1 and to support the input portion 25 of the reverse input cut-off clutch 20 so that it can rotate freely.

[0102] In this example, the input arm portion 43 is composed of two input arms 43. The two input arms 43 protrude radially oppositely from the axial ends of the input shaft portion 42, and each has a fitting hole 45 serving as an axial through hole at its respective radial midpoint. In this example, with the first rotating shaft 22 rotatably supported inside the first housing element 6, the two input arms 43 overlap radially with the protrusion 13. Specifically, the axial ends of the two input arms 43 are located radially inside the axial ends of the protrusion 13.

[0103] The input-side engaging portion 44 consists of two input-side engaging portions 44. Each input-side engaging portion 44 is composed of a cylindrical pin, the other end of which is pressed in and fixed to the engaging hole 45 provided in the two input arms 43. In this state, the two input-side engaging portions 44 extend axially to one side from the two input arms 43.

[0104] Furthermore, the input section can also be integrally formed, i.e., constituted as a single component. In this example, based on the number of engaging members 40 described below (two in this example), the input arm 43 and the input-side engaging member 44 are composed of two input arms 43 and two input-side engaging members 44. However, in implementing the present invention, the number of input arms and input-side engaging members is not limited to two; the number of input arms and input-side engaging members can be set to one, or three or more, depending on the number of engaging members.

[0105] The output section 27 is located on the other side of the axial direction of the second rotating shaft 23. For example... Figure 3 As shown, the output section 27 includes an output-side engaging portion 28. In this example, the output-side engaging portion 28 protrudes axially from the end face on the other side of the portion of the second rotating shaft 23 that has the flange portion 31. Figures 4-6 , Figure 19 (A) and Figure 19 As shown in (B), the outer peripheral surface of the output-side engagement portion 28 has a minor axis direction ( Figures 4-6 , Figure 19 (A) and Figure 19 The two sides of (B) in the vertical direction) 47 and the long axis direction ( Figures 4-6 , Figure 19 (A) and Figure 19 A pair of guide surfaces 48 on the sides of the left and right directions of (B).

[0106] Each side 47 is formed by a flat surface orthogonal to the short axis direction of the output-side engagement portion 28. Each guide surface 48 is formed by a convex curved surface. Specifically, each guide surface 48 is formed by a partially cylindrical convex surface centered on the central axis of the output-side engagement portion 28 (the central axis of the second rotation axis 23). Therefore, regarding the second rotation axis 23, for example, the outer peripheral surface of the round bar raw material can be used as a pair of guide surfaces 48, thereby suppressing processing costs. However, in the case of implementing the present invention, the convex curved surfaces that serve as a pair of guide surfaces can also be provided as partially cylindrical convex surfaces centered on an axis parallel to the central axis of the second rotation axis 23, or as partially elliptical cylindrical convex surfaces, etc., which are non-cylindrical convex surfaces. Furthermore, in this example, the stepped cylindrical member 32 including the output-side engagement portion 28 is manufactured integrally, but in the case of implementing the present invention, it is also possible to combine and fix the shaft members manufactured separately to the output-side engagement portion. The output-side engagement portion 28 is positioned radially inward from the two input-side engagement portions 44, specifically in the portion between the two input-side engagement portions 44.

[0107] The pressed surface 39 is formed by a cylindrical concave surface directly formed on the inner circumferential surface of the motor housing 1 and centered on the rotation center of the output rotating shaft 2. In this example, the pressed surface 39 is directly formed on the inner circumferential surface of the clutch receiving portion 21, that is, directly formed on the axial one-sided portion of the cylindrical portion 16 of the second housing element 7, that is, the inner circumferential surface of the portion that is closer to the axial one-sided portion than the portion that engages with the protrusion 13 of the first housing element 6. However, it is also possible to embed and fix a separate annular component inside the inner side of the axial one-sided portion of the cylindrical portion 16 of the second housing element 7, and the pressed surface 39 is formed by the inner circumferential surface of the annular component. Alternatively, friction material can be fixed to the inner circumferential surface of the axial one-sided portion of the cylindrical portion 16 of the second housing element 7 by adhesive, bonding, etc., and the pressed surface 39 is formed by the inner circumferential surface of the friction material, or a coating can be formed and the pressed surface 39 is formed by the surface of the coating.

[0108] In this example, the engaging member 40 is composed of two engaging members 40. The two engaging members 40 are disposed radially inside the pressed surface 39. Each engaging member 40 is composed of multiple components, including an engaging member body 49 and a connecting rod member 50 that is pivotally connected to the engaging member body 49. However, in implementing the present invention, the number of engaging members is not limited to two. For example, one of the two engaging members constituting the two engaging members may be omitted, and the engaging member may be composed of only one engaging member. Alternatively, the engaging member may be composed of three or more engaging members.

[0109] like Figures 12-17 As shown, the engaging body 49 is constructed by combining multiple components. The structure of the assembled engaging body 49 will be described below, followed by a description of the structure of each component constituting the engaging body 49.

[0110] The engaging body 49 has a generally semi-circular plate shape and includes two pressing surfaces 51 opposite to the pressed surface 39, a swing support shaft 52 serving as a swing support, and an output side engaged portion 53 that engages with the output side engaging portion 28.

[0111] In this example, the outer peripheral surface of the engaging component body 49 is composed of a convex arc-shaped radial outer surface corresponding to the arc of the engaging component body 49 and a crank-shaped radial inner surface corresponding to the chord of the engaging component body 49. Furthermore, the radial direction of the engaging component body 49 refers to the direction orthogonal to the chord of the engaging component body 49. Figure 4 The direction indicated by arrow A, the width direction of the engaging body 49 refers to the direction parallel to the chord of the engaging body 49. Figure 4 The direction indicated by the middle arrow B. In this example, the radial direction of the engaging body 49 is the direction in which the engaging body 49 constituting the engaging member 40 moves near or far relative to the pressed surface 39, which corresponds to the first direction. The width direction of the engaging body 49 corresponds to the second direction, which is orthogonal to both the first direction and the axial direction of the pressed surface 39.

[0112] In this example, two engaging members 40 are arranged radially inside the pressed surface 39 with their respective outer radial surfaces of engaging member bodies 49 facing opposite sides and their respective inner radial surfaces of engaging member bodies 49 facing each other. The inner diameter of the pressed surface 39 and the radial dimension of the engaging member bodies 49 are limited so that, with the two engaging members 40 arranged radially inside the pressed surface 39, at least one of the portions between the pressed surface 39 and the outer radial surfaces of the engaging member bodies 49, and the portions between the inner radial surfaces of the engaging member bodies 49, provides a gap that allows the engaging member bodies 49 to move radially.

[0113] The engaging body 49 has two pressing surfaces 51 on its radially outer surface. These two pressing surfaces 51 are portions of the engaging body 49 that are pressed against the pressed surface 39 in the locked or semi-locked state of the output section 27 (second rotation shaft 23), and are located at two circumferentially separated portions on the radially outer surface of the engaging body 49. Each pressing surface 51 protrudes further toward the pressed surface 39 than the portion of the radially outer surface of the engaging body 49 that is circumferentially offset from the pressing surface 51. Each pressing surface 51 is a partially cylindrical convex surface with a radius of curvature smaller than that of the pressed surface 39. The portion of the radially outer surface of the engaging body 49 that is circumferentially offset from the two pressing surfaces 51, i.e., the portion located circumferentially between the two pressing surfaces 51, is a non-contact surface that does not contact the pressed surface 39.

[0114] The engaging body 49 has an internal space 54 at its central portion in the thickness direction (axial direction) of its central portion in the width direction. The radially opposite ends of the internal space 54 open onto the radially outer and radially inner sides of the engaging body 49, respectively. The engaging body 49 has an axially arranged swing support shaft 52, the axially intermediate portion of which is located at the radially outer portion of the central portion in the width direction of the internal space 54. The swing support shaft 52 is constructed of a cylindrical pin. The axially opposite ends of the swing support shaft 52 are supported by portions of the engaging body 49 that clamp the internal space 54 from both axially opposite sides.

[0115] The engaging body 49 has an output-side engaging portion 53 at the center of its radially inner side in the width direction. The output-side engaging portion 53 is a generally rectangular recess that is recessed radially outward from the center of the radially inner side of the engaging body 49 (the side farther from the pressed surface 39) in the width direction.

[0116] like Figure 4 , Figure 5 , Figure 19 (A) and Figure 19 As shown in (B), the output-side engaging portion 53 has a front half in the short-axis direction that allows the output-side engaging portion 28 to be disposed inside it. In particular, in this example, as... Figure 5 and Figure 19 As shown in (B), the output-side engaging portion 53 has an inner surface shape that matches the outer peripheral surface of the front half of the output-side engaging portion 28 in the short axis direction.

[0117] The inner surface of the output-side engaging portion 53 has a bottom surface 55 and a pair of guided surfaces 56. The bottom surface 55 is formed by a flat surface orthogonal to the radial direction of the engaging body 49. The pair of guided surfaces 56 are located at the ends of both sides of the inner surface of the output-side engaging portion 53 in the width direction of the engaging body 49, and are opposite to each other in this width direction. The pair of guided surfaces 56 are formed by a pair of concave curved surfaces, which are inclined towards the radially inward side of the engaging body 49, that is, towards the direction that is radially away from the pressed surface 39 of the engaging body 49, and the more they are inclined towards the direction in which the spacing between them increases.

[0118] A pair of guided surfaces 56 can contact a pair of guide surfaces 48 of the output-side engagement portion 28. Each guided surface 56 is composed of a locally cylindrical concave surface having the same radius of curvature as or slightly larger than that of each guide surface 48. That is, in this example, as... Figure 5 and Figure 19 As shown in (B), the output-side engaging portion 53 has an inner surface shape that matches the outer peripheral surface of the front half of the output-side engaging portion 28 in the minor axis direction. Therefore, the bottom surface 55 of the output-side engaging portion 53 can contact the side surface 47 of the output-side engaging portion 28, and a pair of guided surfaces 56 of the output-side engaging portion 53 can contact the front half surface in the minor axis direction of a pair of guide surfaces 48 of the output-side engaging portion 28. Furthermore, in implementing the present invention, each guided surface can also be formed from a non-cylindrical concave surface such as a partially elliptical concave surface.

[0119] The engaging body 49 has a through hole 57 on its radially inner side at its central portion in the width direction. The through hole 57 is an elongated arc-shaped hole that axially penetrates the radially inner side of the central portion in the width direction of the engaging body 49 and extends circumferentially. The through hole 57 is sized to allow the input-side engaging portion 44 to be loosely inserted. Specifically, when the input-side engaging portion 44 is inserted into the inside of the through hole 57, there is a circumferential gap between the input-side engaging portion 44 and the inner surface of the through hole 57, as well as a radial gap in the engaging body 49. Therefore, the input-side engaging portion 44 can be displaced relative to the through hole 57 of the engaging body 49 in the rotational direction of the input portion 25 (first rotation axis 22) based on the existence of the aforementioned circumferential gap. Furthermore, when a reverse torque is input to the output portion 27, the engaging body 49 can be radially displaced relative to the input-side engaging portion 44 based on the existence of the radial gap in the engaging body 49. In other words, the size of the through hole 57 is limited in such a way that when the reverse input cut-off clutch 20 is operated as described below, the inner periphery of the through hole 57 will not interfere with the input side engagement portion 44 and thus hinder the operation.

[0120] The engaging body 49 is constructed by combining multiple components. Specifically, the engaging body 49 consists of a pair of main plates 58, a pair of intermediate plates 59, a swing support shaft 52, multiple bolts 60 as connecting parts, and multiple nuts 61.

[0121] A pair of main body plates 58 are components constituting the two sides of the engaging body 49 in the thickness direction, and are arranged overlapping in the axial direction. Each main body plate 58 is a stamped product manufactured by blanking a metal plate such as steel plate through a stamping process, and has a generally semi-circular plate shape. The main body plate 58 has two convex surfaces 62 at two circumferentially separated positions on its radially outer side, which form the pressing surface 51 after the engaging body 49 is assembled. The main body plate 58 has a circular mounting hole 63 at the center of its radially outer width direction. The main body plate 58 has a recess 64 at the center of its radially inner width direction, which forms the output-side engaging portion 53 after the engaging body 49 is assembled. Therefore, in this example, the two recesses 64 arranged axially separated constitute the output-side engaging portion 53. The main body plate 58 has a through hole 65 at the center of its radially inner width direction, which forms the insertion hole 57 after the engaging body 49 is assembled. The engaging body 49 has multiple (three in the illustrated example) through holes 66 on both sides in the width direction. The engaging body 49 also has positioning holes 67 on both sides in the width direction at locations offset from the multiple through holes 66.

[0122] A pair of intermediate plates 59 are components forming the middle portion of the main body 49 in the thickness direction. Each intermediate plate 59 is a stamped product manufactured by blanking a metal sheet such as steel sheet, and has a generally fan-shaped form. The pair of intermediate plates 59 are clamped between the two sides of a pair of main body plates 58 in the width direction. The radially outer surface of the intermediate plate 59 is located radially inward than the radially outer surface of the pair of main body plates 58, and does not contact the pressed surface 39. The intermediate plate 59 has a protrusion 68 in the middle portion of its radially inward surface in the width direction. The protrusion 68 protrudes radially inward more than the radially inward surface of the pair of main body plates 58. The portions of each intermediate plate 59 other than the protrusion 68 are arranged between the pair of main body plates 58. Each intermediate plate 59 has through holes 69 at multiple locations aligned with through holes 66 of the pair of main body plates 58. The intermediate plate 59 has positioning holes 70 at locations aligned with positioning holes 67 of each pair of main body plates 58.

[0123] A pair of main body plates 58 and a pair of intermediate plates 59 are joined and fixed together by threading nuts 61 onto the front ends of a plurality of bolts 60 inserted into the through holes 66 of the aligned main body plates 58 and the through holes 69 of the aligned intermediate plates 59, and then further tightening them. Furthermore, in this example, during the joining and fixing operation, a positioning rod is inserted into the positioning holes 67 of the aligned main body plates 58 and the positioning holes 70 of the aligned intermediate plates 59, making it easy to align the through holes 66 of the main body plates 58 with the through holes 69 of the intermediate plates 59. In this example, after the pair of main body plates 58 and the pair of intermediate plates 59 are joined and fixed as described above, an internal space 54 is formed between the pair of main body plates 58 and between the pair of intermediate plates 59 in the width direction.

[0124] The swing support shaft 52 is composed of a cylindrical pin. The two axial ends of the swing support shaft 52 are pressed into and fixed to a pair of mounting holes 63 on the main body plate 58. The axial middle part of the swing support shaft 52 is disposed in the internal space 54.

[0125] like Figure 16 As shown, the connecting rod component 50 is a stamped product manufactured by stamping a metal plate such as a steel plate. It has a generally rectangular plate shape or a generally oblong plate shape and is disposed in the internal space 54 of the engaging body 49, that is, disposed axially between a pair of main plates 58 and between a pair of intermediate plates 59 in the circumferential direction.

[0126] The thickness of the connecting rod component 50 is smaller than the axial width of the internal space 54 (= the distance between the opposing sides of the pair of main body plates 58 = the thickness of the intermediate plate 59). The connecting rod component 50 has a support hole 72 at its first end 71, which is an axially penetrating circular hole and forms a swing-supported portion, and at its second end 73, which is an axially penetrating circular hole, it has an input-side engaging portion 74.

[0127] A swing support shaft 52 is loosely inserted into the support hole 72. Thus, the first end 71 is connected to the swing support shaft 52 in a swingable manner. An input-side engaging portion 44 is loosely inserted into the input-side engaging portion 74. Thus, the second end 73 is connected to the input-side engaging portion 44 in a swingable manner.

[0128] In order to loosely insert the swing support shaft 52 into the inside of the support hole 72, the support hole 72 has an inner diameter larger than the outer diameter of the swing support shaft 52. Furthermore, in order to loosely insert the input-side engaging portion 44 into the inside of the input-side engaged portion 74, the input-side engaged portion 74 has an inner diameter larger than the outer diameter of the input-side engaging portion 44. Additionally, when the two pressing surfaces 51 of the engaging member 40 are in contact with the pressed surface 39 and the input-side engaging portion 44 is located at the center of the engaging member body 49 in the width direction, as... Figure 9 As shown, the distance Wa between the opposite ends of the swing support shaft 52 and the input side engaging portion 44 is set to be less than or equal to the distance Wb between the opposite ends of the support hole 72 and the input side engaging portion 74 (Wa≤Wb).

[0129] From the viewpoint of facilitating the assembly of the reverse input cut-off clutch 20, the difference between the interval Wa and the interval Wb, Wb-Wa, is preferably as large as possible. However, from the viewpoint of enabling the engaging member 40 to move radially inward immediately when torque is input to the input section 25 to achieve a non-locked state, it is preferable to keep it as small as possible.

[0130] In this example, the force-applying component 41 consists of two force-applying components 41. For example... Figure 12 and Figure 13 As shown, two force-applying components 41 are positioned between the two sides of the radially inner sides of the two engaging member bodies 49 constituting the two engaging members 40 in the width direction. That is, the two force-applying components 41 are positioned offset from the output-side engaging portion 28 in the width direction of the engaging member bodies 49, corresponding to the second direction. The two force-applying components 41 elastically apply force to the two engaging members 40 in a radially outward direction, i.e., elastically apply force to the two engaging members 40 in a direction approaching the pressed surface 39. Thus, in a neutral state where no torque is applied to the input portion 25 (first rotating shaft 22) and the output portion 27 (second rotating shaft 23), the two pressing surfaces 51 of each engaging member 40 are in contact with the pressed surface 39.

[0131] In this example, the force-applying component 41 is made of a helical spring, and the force-applying component 41 is prevented from falling off from the radial inner side of the two engaging components 49 by inserting the protrusions 68 of the two engaging components 40 into the inner side of the axial sides of the force-applying component 41.

[0132] In this example, the outer diameter of the force-applying component 41 is smaller than the axial thickness of the engaging body 49. Therefore, as Figure 14 and Figure 15 As shown, the force-applying component 41 does not protrude further outward than the sides of the engaging body 49.

[0133] The reason why the two pressing surfaces 51 of each engaging member 40 are in contact with the pressed surface 39 in the neutral state, as described above, is to immediately achieve the locking state when a torque is input to the output unit 27 in the reverse direction, as will be explained below.

[0134] In the assembled state of the reverse input cut-off clutch 2, the two input-side engaging portions 44 of the input portion 25, located on the other axial side, are axially inserted into the insertion holes 57 (through holes 65 of the main body plate 58) of the two engaging members 40 and the input-side engaging portion 74 of the connecting rod member 50. Furthermore, the output-side engaging portion 28 of the output portion 27, located on one axial side, is axially inserted between the output-side engaging portions 53 of the two engaging members 40. That is, the two engaging members 40 are configured to clamp the output-side engaging portion 28 radially outward using the output-side engaging portions 53 of each engaging member 40.

[0135] <Operational Instructions for Reverse Input Clutch 20>

[0136] Next, the operation of the reverse input cut-off clutch 20 will be explained.

[0137] (When torque is input to input unit 25 (first rotating shaft 22))

[0138] First, the case where torque is input to the input unit 25 (first rotating shaft 22) will be explained. In the electric motor with a reverse input cut-off clutch in this example, the stator 5 is energized, and a force in the rotational direction is applied to the rotor 4 inside the stator 5, thereby driving the first rotating shaft 22 of the output rotating shaft 2 to rotate. If the first rotating shaft 22 is driven to rotate, then as... Figure 5 As shown, inside the input-side engaging portion 74, the input-side engaging portion 44 of the input portion 25 is along the rotation direction of the first rotation axis 22 (in... Figure 5 In the example, the rotation is clockwise. Therefore, as... Figures 4 to 5 As shown, the input-side engaging portion 44, based on its engagement with the input-side engaged portion 74, causes the connecting rod member 50 to move radially inward while swinging. Consequently, the input-side engaging portion 44 pulls the swing support shaft 52 radially inward via the connecting rod member 50. As a result, as... Figure 5 As shown, the two engaging members 40 move in a direction away from the pressed surface 39 (radially inward). The two pressing surfaces 51 of the two engaging members 40 move away from the pressed surface 39, as... Figure 19 (A) to Figure 19As shown in (B), the output-side engaging portions 53 of the two engaging members 40 radially clamp the output-side engaging portions 28 of the output section 27, and the output-side engaging portions 28 and the output-side engaging portions 53 are engaged without wobbling. As a result, the torque input to the input section 25 is transmitted to the output section 27 (second rotating shaft 23) via the two engaging members 40, and is taken out from the gear section 30 of the second rotating shaft 23. Specifically, the torque is transmitted to the gear meshing with the gear section 30 or to the belt mounted on the gear section 30.

[0139] In particular, in the construction of this example, when the engaging member 40 moves in a direction away from the pressed surface 39 (radially inward) as described above, such as Figures 4 to 5 as well as Figure 19 (A) to Figure 19 As shown in (B), the pair of guide surfaces 48 provided by the output-side engaging portion 28 guides the pair of guided surfaces 56 provided by the output-side engaged portion 53, thereby restricting the movement of the engaging member 40 in the width direction. Furthermore, as... Figure 5 and Figure 19 As shown in (B), the bottom surface 55 of the output-side engaging portion 53 contacts the side surface 47 of the output-side engaging portion 28, and a pair of guided surfaces 56 of the output-side engaging portion 53 contacts a pair of guide surfaces 48 of the output-side engaging portion 28. Therefore, in this example configuration, after the locked or semi-locked state is released, it is possible to effectively prevent the engaging member 40 from deviating in the width direction and contacting the pressed surface 39. In this example configuration, the output-side engaging portion 28 can be used to guide the engaging member 40 to move radially inward, thus reducing the number of components compared to a configuration that includes other components only for this guidance.

[0140] Furthermore, in this example, the pair of guide surfaces 56 of the output-side engaging portion 53 are each composed of a pair of concave curved surfaces that incline towards the radially inward direction, increasing in the direction of their inter-surface spacing. Moreover, the pair of guide surfaces 48 of the output-side engaging portion 28 are each composed of a pair of convex curved surfaces that match the aforementioned pair of concave curved surfaces. Therefore, as... Figure 19 As shown in (A), when the engaging member 40 is radially outward from the output-side engaging portion 28, a gap is formed between the pair of guided surfaces 56 and the pair of guide surfaces 48, and the size of this gap (width dimension) increases towards the radial outward. Therefore, in the configuration of this example, when the engaging member 40 is radially outward from the output-side engaging portion 28, the movement of the engaging member 40 in the width direction and rotation direction can be appropriately permitted, thereby effectively preventing the application of unreasonable forces to the engaging member 40.

[0141] (When torque is input in the reverse direction to the output unit 27 (second rotating shaft 23))

[0142] Next, the case where torque is input in the reverse direction to the output section 27 (second rotating shaft 23) will be explained. If an external force acts on the gear meshing with the gear section 30 or on the belt mounted on the gear section 30, torque may sometimes be input in the reverse direction to the second rotating shaft 23 via the gear section 30. If torque is input in the reverse direction to the second rotating shaft 23, then... Figure 6 As shown, the output-side engaging portion 28 is located inside the two output-side engaging portions 53 along the rotation direction of the second rotation axis 23 (in the direction of rotation). Figure 6 In the example, the rotation is clockwise. Then, the corner of the connection between the side surface 47 and the guide surface 48 of the output-side engaging portion 28 presses radially outward against the bottom surface 55 of the output-side engaging portion 53, causing the two engaging members 40 to move towards the pressed surface 39 (radially outward). As a result, a pair of pressing surfaces 51 of each engaging member 40 are pressed against the pressed surface 39, and the pressing surfaces 51 and the pressed surface 39 engage friably. Consequently, the torque input to the second rotating shaft 23 in the reverse direction is transmitted to the motor housing 1, which is fixed to other components and does not rotate, thus being completely cut off from transmission to the first rotating shaft 22, or only a portion of the torque input to the second rotating shaft 23 in the reverse direction is transmitted to the second rotating shaft 23 while the remainder is cut off.

[0143] To completely cut off the reverse torque input to the second rotating shaft 23 so that it is not transmitted to the first rotating shaft 22, and to prevent the pressing surface 51 from sliding (rotating) relative to the pressed surface 39, two engaging members 40 are clamped between the output-side engaging portion 28 and the pressed surface 39, thereby locking the second rotating shaft 23. Conversely, to cut off the remaining portion of the reverse torque input to the second rotating shaft 23 and transmit it to the first rotating shaft 22, two engaging members 40 are clamped between the output-side engaging portion 28 and the pressed surface 39, allowing the pressing surface 51 to slide relative to the pressed surface 39, thus partially locking the second rotating shaft 23. In the partially locked state of the second rotating shaft 23, if a further reverse torque is input to the second rotating shaft 23, the two engaging members 40, based on the engagement between the output-side engaging portion 28 and the output-side engaged portion 53, cause the pressing surface 51 to slide relative to the pressed surface 39 and rotate about the rotation center of the second rotating shaft 23. If the two engaging parts 40 rotate, the input side engaging part 44 is pulled by the swing support shaft 52 via the connecting rod part 50, transmitting a portion of the torque to the first rotating shaft 22.

[0144] In this example, the two engaging members 40 have pressing surfaces 51 at two circumferentially separated locations on the radially outer side of their respective engaging member bodies 49. Therefore, when a torque is input in the opposite direction to the second rotating shaft 23, the frictional engaging force between the pressed surface 39 and the pressing surface 51 can be increased through the wedge effect. However, in implementing the present invention, it is also possible to adopt a structure in which the pressing surface is only located at one circumferential location on the radially outer side of the engaging member body.

[0145] In this example of an electric motor with a reverse input cut-off clutch, the output rotating shaft 2 is formed by connecting the first rotating shaft 22 and the second rotating shaft 23, which are arranged coaxially, using the reverse input cut-off clutch 20. Therefore, compared with the electric actuator described in Japanese Patent Application Laid-Open No. 2007-16878, which arranges the input and output components of the reverse input cut-off clutch parallel to the output shaft of the electric motor, the electric motor with a reverse input cut-off clutch in this example is easier to miniaturize.

[0146] In particular, in this example, the axially unilateral end of the second rotating shaft 23, which is axially separated from the first rotating shaft 22 by the gear portion 30, is supported by the bearing assembly 3, allowing it to rotate freely relative to the fixed portion 34, which is composed of a housing independent of the motor housing 1. Therefore, it is easy to keep the axial dimension of the motor housing 1, which houses the motor drive unit composed of the rotor 4 and the stator 5, as well as the reverse input cut-off clutch 20, to a shorter length.

[0147] That is, such as Figure 20 In the comparative example shown, the bearing assembly 3z supports the axially intermediate portion of the second rotating shaft 23z, which is closer to the first rotating shaft 22z in the axial direction than the gear portion 30, so that it can rotate freely relative to the motor housing 1z. In this configuration, the amount of protrusion (the distance between the axially oriented end face of the first housing element 6 and the axially oriented end face of the second housing element 7z) Lz protruding from the axially oriented end face of the first housing element 6 becomes larger. In summary, in the configuration of the comparative example, it is necessary to provide a bearing retaining portion 75 in the second housing element 7z for embedding and retaining the outer ring 36z of the bearing assembly 3z, and correspondingly, the aforementioned protrusion Lz becomes larger.

[0148] In contrast, in the electric motor with a reverse input cut-off clutch in this example, it is not necessary to provide a bearing retaining portion for embedding and retaining the outer ring 36 of the bearing device 3 in the second housing element 7. Therefore, the protrusion L of the axial single-sided end face of the second housing element 7 protruding from the axial single-sided end face of the first housing element 6 can be suppressed to a smaller extent, and the axial dimension of the motor housing 1 can be suppressed to a shorter length. From this perspective, it is also easier to achieve miniaturization of the motor with a reverse input cut-off clutch.

[0149] In this example, the bearing assembly 3 is constructed from a four-point contact type or a deep groove single-row radial ball bearing. In particular, if the bearing assembly 3 is constructed from a four-point contact type single-row radial ball bearing, the axial dimension of the axial dimension of one side of the external bearing assembly 3 in the second rotating shaft 23 can be suppressed, and the load capacity of the bearing assembly 3 can be increased. Furthermore, in implementing the present invention, the bearing assembly can also be constructed from a double-row radial rolling bearing such as a double-row angular contact ball bearing.

[0150] and, Figure 20 The electric motor with a reverse input cut-off clutch shown in the comparative example is constructed by assembling a reverse input cut-off clutch 20 into an existing electric motor. For this purpose, the first rotating shaft 22z is constructed by externally fitting a fitting 83 having two input arm portions 43 constituting the input portion 25z to one axially oriented end of the rotating shaft body 82 in a manner capable of transmitting torque. In this comparative example construction, it is necessary to ensure a certain degree of engagement length between the rotating shaft body 82 and the fitting 83; correspondingly, the length of the axially oriented end of the first rotating shaft 22z (the portion protruding further axially than the portion externally fitted with the axially oriented bearing 24z) becomes longer.

[0151] In contrast, in this example, the input portion 25 of the first rotating shaft 22, which constitutes the reverse input cut-off clutch 20, and the portion for externally fixing the rotor 4 are integrated, thus allowing the length of the axial end of the first rotating shaft 22 on one side to be kept short. From this perspective, it is also easier to miniaturize the electric motor with the reverse input cut-off clutch. However, in implementing the present invention, the first rotating shaft can also be constructed by combining the rotating shaft body with the externally fixed rotor and the accessory having the input arm portion in a manner capable of transmitting torque.

[0152] Furthermore, in this example, with the first rotating shaft 22 rotatably supported inside the first housing element 6, the two input arms 43 overlap radially with the protrusion 13. Therefore, the axial dimension of the clutch housing portion 21 housing the reverse input cut-off clutch 20 can be kept short. From this perspective, miniaturization of the electric motor with the reverse input cut-off clutch is also easily achieved.

[0153] Furthermore, in this example, based on the reaction force applied to the gear section 30 when outputting torque from the gear section 30, which serves as a torque output section, and the force applied externally to the gear meshing with the gear section 30 or the belt mounted on the gear section 30, a portion of the force applied to the gear section 30 is supported by the fixed portion 34 via the second rotating shaft 23 and the bearing assembly 3. Therefore, the force applied to the two bearings 24a, 24b, especially the bearing 24a on one axial side, can be reduced to a smaller value, wherein the two bearings 24a, 24b support the first rotating shaft 22 of the external rotor 4 so that it can rotate freely relative to the motor housing 1. As a result, miniaturization of the two bearings 24a, 24b, especially the bearing 24a on one axial side, is possible.

[0154] Furthermore, in this example, the rotating shaft recess 26 formed on one axial side of the end face of the first rotating shaft 22 is sleeved with the rotating shaft protrusion 29 formed on the other axial side of the end face of the second rotating shaft 23. Therefore, even if the axial side of the second rotating shaft 23 is supported by the bearing device 3, which is a single-row deep groove ball bearing, and is rotatable relative to the fixed part 34, the second rotating shaft 23 can be prevented from wobbling, that is, the oscillation of the second rotating shaft 23 centered on the axial side end can be prevented from becoming too large. In addition, in this example, the rotating shaft recess 26 is formed on the first rotating shaft 22, and the rotating shaft protrusion 29 is formed on the second rotating shaft 23, but the rotating shaft protrusion formed on the first rotating shaft can be sleeved with the rotating shaft recess formed on the second rotating shaft. In addition, as long as the coaxiality of the first rotating shaft and the second rotating shaft can be ensured, the rotating shaft protrusion and the rotating shaft recess can also be omitted.

[0155] Furthermore, according to this example, when torque is input to the first rotating shaft 22, the reverse input cut-off clutch 20 can be smoothly switched from a locked or semi-locked state to an unlocked state. (See reference...) Figure 18 (A) and Figure 18 (B) explains this point.

[0156] Figure 18 (A) of (a) and Figure 18 (A) and (b) regarding the construction of this example show the relative positional relationship between a portion of the input section 25 and a portion of the engaging member 40. More specifically, Figure 18 (A) of (a) shows the above positional relationship in the following states: Figure 6 In the locked or semi-locked state shown, the input side engaging portion 44 is located at the center of the engaging member 40 in the width direction, and the connecting rod member 50 is closest to the radial inner side. Figure 18 (A) and (b) show the above positional relationship in the following states: from Figure 18In the state shown in (A) (a), a torque T is input to the input section 25, thereby causing the input side engagement section 44 to rotate in the rotation direction of the input section 25 (clockwise in the illustrated example), and the load F is applied to the swing support shaft 52 via the connecting rod member 50 from the input side engagement section 44.

[0157] on the other hand, Figure 18 (B) of (a) and Figure 18 (B) of the comparative example (i.e., a structure identical to the existing structure described above, except that the input-side engaging portion 44z of the input portion 25z is cylindrical) shows the relative positional relationship between a portion of the input portion 25z and a portion of the engaging member 40z. More specifically, Figure 18 (B) of (a) shows the above positional relationship in the following state: in the locked or semi-locked state, the input side engaging part 44z is located at the center of the width direction of the engaging part 40z. Figure 18 (B) and (b) show the above positional relationship in the following states: from Figure 18 In the state shown in (B) (a), a torque T is input to the input section 25z, thereby causing the input side engaging section 44z to rotate in the rotation direction of the input section 25z (clockwise in the illustrated example). The input side engaging section 44z abuts against the input side engaging section 74z of the engaging member 40z, and a translational load Ft based on the torque T is applied to the abutment section X between the input side engaging section 44z and the input side engaging section 74z.

[0158] In the construction of the comparative example, such as Figure 18 As shown in (B) and (b), the direction of the translational load Ft, that is, the direction of the load acting from the input part 25z on the locking member 40z, is significantly inclined relative to the direction in which the locking member 40z should move when switching from the locked or semi-locked state to the unlocked state, that is, the radial direction of the locking member 40z (the direction in which the locking member 40z moves near or far relative to the pressed surface).

[0159] In contrast, in the construction of this example, as follows: Figure 18As shown in (A) and (b), the direction of the translational load F, i.e., the direction of the load acting on the engaging member 40 from the input section 25, is approximately parallel to the direction in which the engaging member 40 should move when switching from the locked or semi-locked state to the unlocked state, i.e., the radial direction of the engaging member 40 (the direction in which the engaging member 40 moves closer to or further away from the pressed surface 39). In other words, the angle between the direction of the translational load F and the direction in which the engaging member 40 should move is smaller than the angle between the direction of the translational load Ft and the direction in which the engaging member 40z should move in the comparative example. That is, in the configuration of this example, the torque T input to the input section 25 can be efficiently converted into a load for moving the engaging member 40 radially inward. Therefore, according to the configuration of this example, when torque is input to the input section 25 (first rotating shaft 22), the switching from the locked or semi-locked state to the unlocked state can be performed smoothly.

[0160] Furthermore, in the construction of this example, in Figure 18 In the state shown in (A) (a), there is a gap G between the radially inner surface of the input-side engaging portion 44 and the inner circumferential surface of the input-side engaging portion 74 of the connecting rod member 50. In the comparative example's construction, Figure 18 In the state shown in (B) of (a), there is a gap Gz between the radially inner surface of the input-side engaging portion 44z and the input-side engaged portion 74z. From the viewpoint of facilitating the assembly of the reverse input cut-off clutch, the size of the gap G (the aforementioned difference Wb-Wa) and the size of the gap Gz are preferably as large as possible. However, from the viewpoint of being able to immediately move the engaging members 40 and 40z radially inward to achieve a non-locked state when torque is input to the input portions 25 and 25z, the size of the gap G and the size of the gap Gz are preferably as small as possible. Therefore, in the manufacture of the reverse input cut-off clutch, considering the above situation, it is necessary to adjust the sizes of the gaps G and Gz to an appropriate size.

[0161] In the comparative example, to adjust the size of the gap Gz, it is sometimes necessary to perform high-precision machining on the portion of the input-side engaging portion 74z that abuts against the radially inner surface of the input-side engaging portion 44z, which increases the estimated cost. In contrast, in the construction of this example, the size of the gap G can be adjusted by simply managing the center distance between the support hole 72 of the connecting rod member 50 and the input-side engaging portion 74, and the connecting rod member 50 is manufactured by inexpensive stamping, thus easily controlling costs.

[0162] Furthermore, in this example, by sleeve-fitting the inner diameter side sleeve fitting surface 79 provided on the outer peripheral surface of the clutch housing 21 to the outer diameter side sleeve fitting surface 80 provided on the fixing part 34, the motor housing 1 can be supported and fixed relative to the fixing part 34 while the motor housing 1 is positioned relative to the fixing part 34. That is, in this example, since the outer diameter of the clutch housing 21 is smaller than the outer diameter of the drive housing 19, the inner diameter side sleeve fitting surface 79 for positioning the motor housing 1 relative to the fixing part 34 can be provided on the outer peripheral surface of the clutch housing 21. Therefore, the installation operation of mounting the motor housing 1 to the fixing part 34 can be easily performed.

[0163] Furthermore, in this example, each engaging member 40 is configured such that the connecting rod member 50 is supported between a pair of main body plates 58 constituting the engaging member body 49, enabling it to swing about the swing support axis 52. However, in implementing the present invention, the engaging member can also be configured such that a pair of connecting rod members are supported on both sides of an axial direction of a main body plate, enabling them to swing about the swing support axis.

[0164] [Second example of implementation]

[0165] Figures 21-26 A second example of an embodiment of the present invention is shown. In this example, the construction of the reverse input cut-off clutch 20a differs from that of the reverse input cut-off clutch 20 in the first embodiment.

[0166] The reverse input cut-off clutch 20a includes an input section 25a, an output section 27a, a pressed surface 39, and an engaging member 40a.

[0167] Input section 25a is provided on first rotating shaft 22 (see reference) Figure 1 The axial end on one side of the ). For example Figure 23 As shown, the input section 25a has an input shaft section 42a and an input side engagement section 44a. The input shaft section 42a has a stepped cylindrical shape and is fitted into the first rotating shaft 22, including a portion with an axially mounted bearing 24a. In this example, the input side engagement section 44a consists of two input side engagement sections 44a. Each input side engagement section 44a is composed of two protrusions extending axially from opposite positions on the diameter side of the front end face of the input shaft section 42a. Furthermore, the axially mounted end face of the input shaft section 42a has a rotating shaft recess 26 that is recessed axially from the center.

[0168] Output unit 27a is provided on second rotating shaft 23 (see reference) Figure 1 The end on the other side of the axial direction. For example... Figure 24As shown, the output section 27a has an output shaft section 76 and an output-side engaging section 28a. The output shaft section 76 has a stepped cylindrical shape and is fitted at the end on the other side of the axial direction of the second rotating shaft 23. The output-side engaging section 28a is generally elongated cylindrical and extends axially from the center of the front end face of the output shaft section 76. The output-side engaging section 28a is disposed between the two input-side engaging sections 44a. Furthermore, the end face on the other side of the axial direction of the output-side engaging section 28a has a cylindrical rotating shaft protrusion 29 that protrudes axially from the center and sleeves with the rotating shaft recess 26.

[0169] The pressed surface 39 is composed of a cylindrical concave surface formed directly on the inner circumferential surface of the motor housing 1 and centered on the rotation center of the output rotating shaft 2.

[0170] In this example, the engaging member 40a consists of two engaging members 40a. The two engaging members 40a are disposed radially inner to the pressed surface 39. Each engaging member 40a has a pressing surface 51a, which is a partially cylindrical convex surface, on its radially outer side opposite to the pressed surface 39, and a bottom surface 77 on its radially inner side opposite to each other. The bottom surface 77, except for the portion forming the output-side engaging portion 53a described below, has two flat surfaces on its two sides in the second direction. Furthermore, the radius of curvature of the pressing surface 51a is less than or equal to the radius of curvature of the pressed surface 39.

[0171] The inner diameter of the pressed surface 39 and the radial dimension of the engaging member 40a are limited so that, with the two engaging members 40a disposed radially inside the pressed surface 39, at least one of the portion between the pressed surface 39 and the pressing surface 51a, and the portion between the bottom surfaces 77, exists.

[0172] Each engaging member 40a has an input-side engaging portion 74a and an output-side engaging portion 53a. The input-side engaging portion 74a is formed by a hole that passes through the radial center of the engaging member 40a axially. The input-side engaging portion 74a is sized to allow loose insertion into the input-side engaging member 40a. Therefore, the input-side engaging portion 44a can be displaced relative to the input-side engaging portion 74a (engaging member 40a) in the rotational direction of the input portion 25a, and the input-side engaging portion 74a (engaging member 40a) can be displaced radially relative to the input-side engaging member 40a. The output-side engaging portion 53a is formed by a generally rectangular recess that extends radially outward from the center of the bottom surface 77 of the engaging member 40a in the width direction. The output-side engaging portion 53a is sized to allow the front half of the output-side engaging portion 28a in the short axis direction to be disposed inside it.

[0173] With the reverse input cut-off clutch 20a assembled, the two input-side engaging portions 44a of the input portion 25a are axially inserted into the input-side engaging portions 74a of the two engaging members 40a, and the output-side engaging portion 28a of the output portion 27a is axially inserted between the two output-side engaging portions 53a. That is, the two engaging members 40a are configured to clamp the output-side engaging portion 28a radially outward using their respective output-side engaging portions 53a.

[0174] <Operational Instructions for Reverse Input Clutch 20a>

[0175] (When torque is input to input unit 25a (first rotating shaft 22))

[0176] If the input section 25a (first rotating shaft 22) is based on the stator 5 (refer to) Figure 1 When an electric current is applied and the object rotates, it will be like... Figure 25 As shown, inside the input-side engaging portion 74a, the input-side engaging portion 44a is along the rotation direction of the input portion 25a (in... Figure 25 In the example, the rotation is clockwise. As a result, the radially inner surface of the input-side engaging portion 44a presses against the inner surface of the input-side engaged portion 74a radially inward, causing the two engaging members 40a to move away from the pressed surface 39. Consequently, the two output-side engaged portions 53a clamp the output-side engaging portion 28a of the output portion 27a from both radial sides, and the output-side engaging portion 28a engages with the two output-side engaged portions 53a without wobbling. Consequently, the torque input to the input portion 25a is transmitted to the output portion 27a via the two engaging members 40a and output from the gear portion 30 of the second rotating shaft 23.

[0177] (When torque is input in the reverse direction to output unit 27a (second rotating shaft 23))

[0178] If torque is input in the reverse direction from gear section 30 to output section 27a (second rotating shaft 23), then as Figure 26 As shown, the output-side engaging portion 28a is located inside the pair of output-side engaging portions 53a along the rotation direction of the output portion 27a (in). Figure 26 In the example, the rotation is clockwise. Consequently, the corner of the output-side engaging portion 28a presses radially outward against the bottom surface of the output-side engaged portion 53a, causing the two engaging members 40a to move towards the pressed surface 39. As a result, the pressing surfaces 51a of each of the two engaging members 40a are pressed against the pressed surface 39. Consequently, the torque input to the output portion 27a in the reverse direction is completely cut off by transmission to the motor housing 1, and is not transmitted to the input portion 25a; or, only a portion of the torque input to the output portion 27a in the reverse direction is transmitted to the input portion 25a while the remainder is cut off.

[0179] The reverse input cut-off clutch 20a in this example can be constructed more simply than the reverse input cut-off clutch 20 in the first embodiment, thus reducing costs. Furthermore, in this example, each engaging member 40a has a pressing surface 51a, but it is also possible to have pressing surfaces at two circumferentially separated locations, similar to the first embodiment. The structure and function of the other parts are the same as in the first embodiment.

[0180] [Third example of implementation]

[0181] Figure 27 This is a third example of an embodiment of the present invention. In this example, the first rotating shaft 22a has a cylindrical rotating shaft recess 26a at the center of its end face on one axial side. The second rotating shaft 23a has a cylindrical rotating shaft protrusion 29a at its end on the other axial side, the protrusion having an outer diameter smaller than the inner diameter of the recess 26a. In this example, the protrusion 29a is inserted into the recess 26a, and a plurality of rolling elements 84 are arranged between the inner circumferential surface of the recess 26a and the outer circumferential surface of the protrusion 29a, thereby forming a radial rolling bearing 81 in the portion between the inner circumferential surface of the recess 26a and the outer circumferential surface of the protrusion 29a. In the illustrated example, needle rollers (rollers) are used as the rolling elements 84. Thus, the first rotating shaft 22a and the second rotating shaft 23a are combined in a coaxial manner and are capable of relative rotation.

[0182] Furthermore, a cylindrical sliding bearing (bushing) can be disposed between the inner circumferential surface of the rotating shaft recess and the outer circumferential surface of the rotating shaft protrusion to replace multiple rolling elements. Also, in the reverse input cut-off clutch 20a of the second embodiment, a radial rolling bearing or a sliding bearing can be disposed between the inner circumferential surface of the rotating shaft recess and the outer circumferential surface of the rotating shaft protrusion. The structure and effects of other parts are the same as in the first and second embodiments.

[0183] Explanation of symbols

[0184] 1—Motor housing, 2—Output rotating shaft, 3, 3z—Bearing assembly, 4—Rotor, 5—Stator, 6—First housing element, 7, 7z—Second housing element, 8—Main body, 9—Cover, 10—Cylindrical part, 11—Annular part, 12—Retaining cylindrical part, 13—Protrusion, 14—Base plate, 15—Retaining cylindrical part, 16—Cylindrical part, 17—Inner diameter side annular part, 18—Outer diameter side annular part, 19—Drive unit housing, 20, 20a—Reverse input cut-off clutch, 21—Clutch housing, 22—First Rotating shaft, 23, 23z—Second rotating shaft, 24a, 24b—Bearing, 25, 25a, 25z—Input section, 26—Rotating shaft recess, 27, 27a—Output section, 28, 28a—Output side engaging section, 29—Rotating shaft protrusion, 30—Gear section, 31—Flange section, 32—Stepped cylindrical component, 33—Cylindrical component, 34—Fixing section, 35—Inner ring, 36, 36z—Outer ring, 37—Ball, 38—Sealing device, 39, 39a—Pressed surface, 40, 40a, 40z — 41 — 42 — 42a — 43 — 44a — 45 — 46 — 47 — 48 — 49 — 40 — 41 — 42 — 40 — 41 — 42a — 42 — 43 — 44 — 44a — 44z — 45 — 46 — 47 — 48 — 49 — 40 — 50 — 51 — 51a — 52 — 53 — 54 — 55 — 56 — 57 — 58 — 59 — 50 — 51 — 52 — 53 — 53a — 54 — 55 — 56 — 57 — 58 — 59 — 60 — 61 — 62 — 60 — 61 — 62 — 63 — 64 — 65 — 66 — 67 — 68 — 69 ...9 — 60 — 61 — 62 — 63 — 64 — 69 — 60 — 61 Surface, 63—Mounting hole, 64—Recess, 65—Through hole, 66—Through hole, 67—Positioning hole, 68—Protrusion, 69—Through hole, 70—Positioning hole, 71—First end, 72—Support hole, 73—Second end, 74, 74a, 74z—Input side engaging part, 75—Bearing retaining part, 76—Output shaft part, 77—Bottom surface, 78—Drive part, 79—Inner diameter side sleeve fitting surface, 80—Outer diameter side sleeve fitting surface, 81—Radial rolling bearing, 82—Rotating shaft body, 83—Accessory, 84—Rolling element.

Claims

1. An electric motor with a reverse input cut-off clutch, characterized in that, have: Motor housing; The output rotating shaft has a first rotating shaft that is rotatably supported inside the motor housing, a second rotating shaft that has a torque output section in the middle of the axial direction and is coaxially arranged with the first rotating shaft, and a reverse input cut-off clutch that is arranged inside the motor housing and connects the first rotating shaft and the second rotating shaft. The bearing assembly is externally fitted into the portion of the second rotating shaft that is axially separated from the torque output portion and located on the opposite side of the first rotating shaft, and the second rotating shaft is rotatably supported on a fixed portion consisting of a housing independent of the motor housing that does not rotate during use. A rotor, which is disposed around the first rotating shaft and rotates integrally with the first rotating shaft; and The stator, which is coaxially arranged with the rotor and supported and fixed inside the motor housing, The aforementioned reverse input cut-off clutch has the following functions: when torque is input to the first rotating shaft, it transmits the torque input to the first rotating shaft to the second rotating shaft; conversely, when torque is input to the second rotating shaft in the opposite direction, it completely cuts off the torque input to the second rotating shaft in the opposite direction, or transmits a portion of the torque input to the second rotating shaft to the first rotating shaft while cutting off the remaining portion. The aforementioned reverse input cut-off clutch has the following features: The surface being pressed; The input section rotates integrally with the aforementioned first rotating axis; An output section, which is coaxially arranged with the input section and rotates integrally with the second rotation axis; and The engaging component has a pressing surface facing the pressed surface described above. The aforementioned engaging member is configured such that, when torque is input to the input section, the pressing surface moves away from the pressed surface and engages with the output section based on the engagement with the input section; conversely, when torque is input to the output section in the opposite direction, the pressing surface moves towards the pressed surface based on the engagement with the output section, and the pressing surface engages with the pressed surface through friction. The aforementioned input section has an input-side engaging portion in the radially offset portion from its rotation center. The output section described above has an output-side engaging portion that is radially more inward than the input-side engaging portion described above. The aforementioned engaging member has an input-side engaging portion capable of engaging with the aforementioned input-side engaging portion, and is disposed between the aforementioned pressed surface and the aforementioned output-side engaging portion. The above-mentioned card assembly has: The engaging component body includes the aforementioned pressing surface, an output-side engaging portion that engages with the aforementioned output-side engaging portion, and a swing support portion located closer to the pressing surface than the input-side engaging portion in the direction in which the pressing surface moves near and far relative to the pressed surface; and The linkage component has the aforementioned input-side engaging portion and a swing-supported portion that is supported to swing relative to the aforementioned swing support portion. The main body of the aforementioned card assembly has: A pair of main body plates, each having a plate-side output engagement portion constituting the aforementioned output-side engagement portion, are axially overlapping and engaged with each other; and The swing support shaft, which constitutes the aforementioned swing support portion, has its axial ends supported by the aforementioned pair of main body plates. The aforementioned connecting rod components are positioned between the pair of main body plates.

2. The electric motor with a reverse input cut-off clutch according to claim 1, characterized in that, The aforementioned bearing assembly consists of radial rolling bearings.

3. The electric motor with a reverse input cut-off clutch according to claim 1, characterized in that, The aforementioned engaging component consists of two engaging components configured to clamp the output-side engaging portion using their respective bottom surfaces.

4. The electric motor with a reverse input cut-off clutch according to claim 1, characterized in that, The aforementioned snap-fit ​​component has an intermediate plate that is clamped between the aforementioned pair of main body plates.

5. The electric motor with a reverse input cut-off clutch according to claim 1, characterized in that, The input section is integrally formed with the first rotating shaft, and the output section is integrally formed with the second rotating shaft.

6. An electric motor with a reverse input cut-off clutch, characterized in that, have: Motor housing; The output rotating shaft has a first rotating shaft that is rotatably supported inside the motor housing, a second rotating shaft that has a torque output section in the middle of the axial direction and is coaxially arranged with the first rotating shaft, and a reverse input cut-off clutch that is arranged inside the motor housing and connects the first rotating shaft and the second rotating shaft. The bearing assembly is externally fitted into the portion of the second rotating shaft that is axially separated from the torque output portion and located on the opposite side of the first rotating shaft, and the second rotating shaft is rotatably supported on a fixed portion consisting of a housing independent of the motor housing that does not rotate during use. A rotor, which is disposed around the first rotating shaft and rotates integrally with the first rotating shaft; and The stator, which is coaxially arranged with the rotor and supported and fixed inside the motor housing, The aforementioned reverse input cut-off clutch has the following functions: when torque is input to the first rotating shaft, it transmits the torque input to the first rotating shaft to the second rotating shaft; conversely, when torque is input to the second rotating shaft in the opposite direction, it completely cuts off the torque input to the second rotating shaft in the opposite direction, or transmits a portion of the torque input to the second rotating shaft to the first rotating shaft while cutting off the remaining portion. The aforementioned reverse input cut-off clutch has the following features: The surface being pressed; The input section rotates integrally with the aforementioned first rotating axis; An output section, which is coaxially arranged with the input section and rotates integrally with the second rotation axis; and The engaging component has a pressing surface facing the pressed surface described above. The aforementioned engaging member is configured such that, when torque is input to the input section, the pressing surface moves away from the pressed surface and engages with the output section based on the engagement with the input section; conversely, when torque is input to the output section in the opposite direction, the pressing surface moves towards the pressed surface based on the engagement with the output section, and the pressing surface engages with the pressed surface through friction. The aforementioned motor housing has the aforementioned pressed surface on its inner circumferential surface. The motor housing includes: a drive section housing the rotor and the stator; and a clutch section having an outer diameter smaller than that of the drive section housing, housing the reverse input cut-off clutch. The aforementioned clutch housing has the aforementioned pressed surface on its inner circumferential surface, and has an inner diameter sleeve fitting surface on its outer circumferential surface whose outer diameter does not change axially.

7. The electric motor with a reverse input cut-off clutch according to any one of claims 1 to 6, characterized in that, One of the aforementioned first rotating shafts and the aforementioned second rotating shafts has a cylindrical rotating shaft recess at the center of its axial end face, and the other of the aforementioned first rotating shafts and the aforementioned second rotating shafts has a rotating shaft protrusion that inserts into the inner side of the aforementioned rotating shaft recess. The aforementioned output rotating shaft has a radial bearing disposed between the inner circumferential surface of the recess of the aforementioned rotating shaft and the outer circumferential surface of the protrusion of the aforementioned rotating shaft.

Images