Reverse input disconnect clutch

Abstract

The present invention realizes a structure capable of suppressing shake of an input member. The leaf spring (6) is disposed on both sides of the input-side engagement section (14) in a first direction, which is a direction in which the pressing surface (33) moves far and near with respect to the pressed surface (7), and a second direction, which is orthogonal to the central axis of the input member (3). And two clamped parts (43) which are elastically clamped between the input-side clamping part (14) and the input-side clamped part (34), and a base part (44) which connects the two clamped parts (43) to each other.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a reverse input cut clutch that transmits torque input to an input member to an output member, and in contrast, completely cuts torque input to the output member in the opposite direction from being transmitted to the input member, or transmits only a part of the torque to the input member while cutting the remaining part. BACKGROUND

[0002] The reverse input cut clutch has an input member connected to an input-side mechanism such as a drive source, and an output member connected to an output-side mechanism such as a reduction mechanism, and has a function of transmitting torque input to the input member to the output member, and in contrast, completely cutting torque input to the output member in the opposite direction from being transmitted to the input member, or transmitting only a part of the torque to the input member while cutting the remaining part.

[0003] The reverse input cut clutch is roughly classified into a lock type and a free type according to a difference in mechanism that cuts torque input to the output member in the opposite direction. The reverse input cut clutch of the lock type has a mechanism that prevents rotation of the output member when torque is input to the output member in the opposite direction. On the other hand, the reverse input cut clutch of the free type has a mechanism that causes the output member to idle when torque is input to the output member. Which of the reverse input cut clutch of the lock type and the reverse input cut clutch of the free type is appropriately determined according to the use of the device in which the reverse input cut clutch is incorporated, or the like.

[0004] A reverse input cut clutch of the lock type is described in International Publication No. 2019 / 026794. The reverse input cut clutch described in International Publication No. 2019 / 026794 has a pressed member, an input member, an output member, and an engaging member.

[0005] The pressed member has a pressed surface on an inner peripheral surface.

[0006] The input member has an input-side engaging portion disposed radially inward of the pressed surface, and is disposed coaxially with the pressed surface.

[0007] The output member has an output-side engaging portion disposed radially inward of the input-side engaging portion radially inward of the pressed surface, and is disposed coaxially with the pressed surface.

[0008] The engaging member has a pressing surface opposed to the pressed surface, an input-side engaged portion that can engage with the input-side engaging portion, and an output-side engaged portion that can engage with the output-side engaging portion, and is disposed so as to be movable in a first direction that is a direction of proximity and distance with respect to the pressed surface.

[0009] In the reverse input cut clutch described in International Publication No. 2019 / 026794, if torque is input to the input member, the input-side engagement portion and the input-side engaged portion are engaged on the basis of this, the engagement piece moves in a direction away from the pressed surface, the output-side engaged portion and the output-side engagement portion are engaged, and torque input to the input member is transmitted to the output member. On the other hand, if torque is input in reverse to the output member, the output-side engagement portion and the output-side engaged portion are engaged on the basis of this, the engagement piece moves in a direction approaching the pressed surface, the pressed surface is pressed against the pressed surface, and the pressed surface and the pressed surface are frictionally engaged.

[0010] Prior Art Documents

[0011] Patent Documents

[0012] Patent Document 1: International Publication No. 2019 / 026794 SUMMARY

[0013] PROBLEMS TO BE SOLVED BY THE INVENTION

[0014] In the reverse input cut clutch described in International Publication No. 2019 / 026794, the dimensional relationship of the respective portions is configured such that, at a position where the engagement piece comes into contact with the pressed surface due to reverse input of torque to the output member, a gap (a gap in the first direction, i.e., the direction of proximity and distance of the engagement piece with respect to the pressed surface) that allows the engagement piece to be pressed toward the pressed surface based on engagement with the output member exists between the engagement piece and the input member, and is not particularly limited other than this.

[0015] In the reverse input cut clutch described in International Publication No. 2019 / 026794, in order not to make the shape accuracy of the input member and the engagement piece excessively high, and in order to ensure the workability of assembly work, it is necessary to limit the dimensions of the respective portions in such a way that the input member and the engagement piece are loosely combined to some extent. In this case, a gap in the first direction is formed at the engagement portion of the input member and the engagement piece.

[0016] In the reverse input cut clutch described in International Publication No. 2019 / 026794, since the gap in the first direction between the input member and the engagement piece is not limited in any way, a gap in the circumferential direction is formed between the input-side engagement portion and the input-side engaged portion. Therefore, due to this gap in the circumferential direction, the input member shakes with respect to the engagement piece, and when the lock is released or the semi-lock is released, it is possible that a loud noise is generated based on the collision of the input member and the engagement piece. In particular, when the direction of torque input to the input member is reversed, the input member shakes significantly, and noise is easily generated.

[0017] The present disclosure aims to achieve a configuration of a reverse input cut clutch that can suppress a shake of an input member to be small.

[0018] Means for solving the problem

[0019] The reverse input cut clutch of one embodiment of the present disclosure includes a pressed member, an input member, an output member, an engaging member, and a flat spring.

[0020] The pressed member has a pressed surface on an inner peripheral surface.

[0021] The input member has an input-side engaging portion arranged radially inward of the pressed surface and is arranged coaxially with the pressed surface.

[0022] The output member has an output-side engaging portion arranged radially inward of the input-side engaging portion radially inward of the pressed surface and is arranged coaxially with the pressed surface.

[0023] The engaging member has a pressed surface opposite to the pressed surface, an input-side engaged portion capable of engaging with the input-side engaging portion, and an output-side engaged portion capable of engaging with the output-side engaging portion, and is arranged to be movable in a first direction, i.e., a direction of proximity and distance between the pressed surface and the pressed surface. The engaging member is configured to transmit a torque input to the input member to the output member by, when a torque is input to the input member, allowing the input-side engaging portion to engage with the input-side engaged portion, allowing the input-side engaged portion to move in the first direction away from the pressed surface, allowing the output-side engaged portion to engage with the output-side engaging portion, and allowing the pressed surface to press against the pressed surface, and to allow the pressed surface to frictionally engage with the pressed surface by, when a reverse torque is input to the output member, allowing the output-side engaging portion to engage with the output-side engaged portion and allowing the pressed surface to press against the pressed surface.

[0024] The flat spring is arranged on both sides of the input-side engaging portion in a second direction orthogonal to a central axis of the input member and the first direction, and has two clamped portions elastically clamped between the input-side engaging portion and the input-side engaged portion and a base portion connecting the two clamped portions to each other.

[0025] In the reverse input cut clutch of one embodiment of the present disclosure, the two clamped portions can impart an elastic force to the input-side engaging portion having a component in the second direction facing each other and a component in the first direction toward a direction in which the pressed surface approaches the pressed surface.

[0026] The reverse input cutoff clutch of one embodiment of the present disclosure can further include an urging member that elastically urges the engaging member in the direction in which the pressing surface approaches the pressed surface in the first direction, and a component of the urging by the urging member in the direction in which the pressing surface approaches the pressed surface in the first direction can be larger than a component of the urging by the two clamped portions in the direction in which the pressing surface is away from the pressed surface in the first direction.

[0027] In the reverse input cutoff clutch of one embodiment of the present disclosure, the two clamped portions can apply an elastic force to the input-side engaging portion that has only a component in the direction in which the two clamped portions face each other in the second direction.

[0028] In the reverse input cutoff clutch of one embodiment of the present disclosure, the two clamped portions can apply an elastic force to the input-side engaging portion that has a component in the direction in which the two clamped portions face each other in the second direction and a component in the direction in which the pressing surface is away from the pressed surface in the first direction.

[0029] In the reverse input cutoff clutch of one embodiment of the present disclosure, the flat spring can include a restriction portion that restricts relative displacement in the axial direction with respect to the engaging member.

[0030] In the reverse input cutoff clutch of one embodiment of the present disclosure, the restriction portion can include two bent pieces bent from end portions on both sides in the axial direction of the two clamped portions or the base portion, and arranged on both sides in the axial direction of the peripheral portion of the input-side engaging portion in the engaging member.

[0031] In the reverse input cutoff clutch of one embodiment of the present disclosure, at least one position in the base portion can be in contact with a portion toward the radially inner side in the inner surface of the input-side engaging portion.

[0032] In the reverse input cutoff clutch of one embodiment of the present disclosure, the engaging member can include two engaging members. In this case, the input-side engaging portion includes two input-side engaging portions.

[0033] Effects of the invention are as follows.

[0034] In the reverse input cutoff clutch of one embodiment of the present disclosure, when the input member rotates, the clamped portion of the two clamped portions included in the flat spring, which is arranged on the front side of the input-side engaging portion in the rotation direction of the input member, is elastically deformed. Thus, the input member can be prevented from wobbling. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1is a perspective view of a reverse input cutoff clutch of a first example of an embodiment of the present disclosure.

[0036] Figure 2 is an end view of the reverse input cutoff clutch of the first example, viewed in an axial direction from an input member side.

[0037] Figure 3 is an A-A sectional view of Figure 2

[0038] Figure 4 is a B-B sectional view of Figure 3

[0039] Figure 5 is a C-C sectional view of Figure 3

[0040] Figure 6 is the same view as Figure 5 , shown in a state where torque is input to an input member.

[0041] Figure 7 is the same view as Figure 5 , shown in a state where torque is input in a reverse direction to an output member.

[0042] Figure 8 is an exploded perspective view of the reverse input cutoff clutch of the first example.

[0043] Figure 9 is an end view of a locking member, a plate spring, and a force applying member that constitute the reverse input cutoff clutch of the first example, viewed in an axial direction.

[0044] Figure 10 is an end view of the locking member that constitutes the reverse input cutoff clutch of the first example, viewed in an axial direction.

[0045] Figure 11 (A) of Figure 11 is a perspective view of a plate spring that constitutes the reverse input cutoff clutch of the first example, Figure 11 (B) of Figure 11 is a plan view viewed from an upper side of (B) of Figure 11 (C) of Figure 11 is a side view viewed from a side of (B) of

[0046] Figure 12 is a front view showing another example of a locking member.

[0047] Figure 13 is the same view as Figure 4 , of a reverse input cutoff clutch of a second example of an embodiment of the present disclosure.​​​

[0048] Figure 14 is a perspective view of a plate spring constituting a reverse input cutoff clutch of a second example.

[0049] Figure 15 is a view schematically showing a main part of a reverse input cutoff clutch of a third example of an embodiment of the present disclosure.

[0050] Figure 16 is a reverse input cutoff clutch of a fourth example of an embodiment of the present disclosure. Figure 15 DETAILED DESCRIPTION

[0051] [First Example]

[0052] (D) of Figures 1-11 (D) of Figure 3 (D) of Figure 3 (D) of

[0053] <Explanation of Configuration of Reverse Input Cutoff Clutch>

[0054] The reverse input cutoff clutch 1 of the present example is provided with the pressed member 2, the input member 3, the output member 4, the engaging member 5, and the plate spring 6. The reverse input cutoff clutch 1 has the following reverse input cutoff function: the torque input to the input member 3 is transmitted to the output member 4, in contrast, the torque input in the reverse direction to the output member 4 is completely cutoff and transmitted to the input member 3, or only a part thereof is transmitted to the input member 3 and the remaining part is cutoff.

[0055] The pressed member 2 has the pressed surface 7 on the inner peripheral surface. The input side engaging portion 14 of the input member 3 and the output side engaging portion 21 of the output member 4 are coaxially arranged on the radially inner side of the pressed surface 7, and the engaging member 5 is arranged so as to be movable in the direction of approach and departure with respect to the pressed surface 7. On the radially inner side of the pressed surface 7, the input side engaging portion 14, the output side engaging portion 21, and the engaging member 5 are rotatable. Also, the pressed surface 7 constitutes a surface that comes into contact with the pressed surface 33 of the engaging member 5 in the case where the engaging member 5 is moved in the direction of approach to the pressed surface 7.

[0056] ​In the present example, the pressed surface 7 is annular in the axial view, although it is not limited thereto, and in the present example, has a cylindrical surface shape with an inner diameter that does not change in the axial direction.

[0057] In the present example, the pressed member 2 is fixed by a fixed portion such as a housing, which does not rotate during use, and its rotation is constrained. Alternatively, the pressed member 2 is constituted by the fixed portion. The pressed member 2 is not limited in shape as long as it has the pressed surface 7 on the inner circumferential surface.

[0058] In the present example, the pressed member 2 is provided with an output-side element 8 and an input-side element, not shown.

[0059] The output-side element 8 has a stepped cylindrical inner circumferential surface. That is, the inner circumferential surface of the output-side element 8 is connected by a connecting surface portion 11 on the axial one side to a large-diameter cylindrical surface portion 9 on the axial one side and a small-diameter cylindrical surface portion 10 on the other axial side. In the present example, the pressed surface 7 is constituted by the large-diameter cylindrical surface portion 9. Further, the output-side element 8 has an inward flange portion 12 protruding toward the radial inner side at the end portion on the other axial side of the small-diameter cylindrical surface portion 10.

[0060] In a state in which the above-described input-side element is fitted (concave-fitted) to the output-side element 8 without play and the output-side element 8 and the input-side element are positioned in the radial direction, the output-side element 8 and the input-side element are coupled to each other by a coupling member such as a bolt, thereby constituting the pressed member 2. The bolt inserted through a through hole provided in the fixed portion is threadedly coupled to a threaded hole 13 opened on the side surface on the other axial side of the output-side element 8, and thereby the pressed member 2 is supported and fixed by the fixed portion.

[0061] The input member 3 has an input-side engagement portion 14 disposed on the radial inner side of the pressed surface 7 and is disposed coaxially with the pressed surface 7. The input member 3 is connected to an input-side mechanism such as an electric motor, is inputted with a torque, and is configured to be able to rotate on the radial inner side of the pressed surface 7 due to the input of the torque. The input-side engagement portion 14 is provided at a portion apart from the rotation center O of the input member 3 to the radial outer side and has a portion engaged with the input-side engagement portion 34 of the engagement member 5. The input-side engagement portion 14 is configured to engage (contact) the radial inner side surface 17 with the radial inner side surface 36 of the input-side engagement portion 34 in conjunction with the rotation of the input member 3 or the engagement member 5.

[0062] In the present example, the input member 3 has, in addition to the input-side engagement portion 14, an input shaft portion 15 and an input flange portion 16.

[0063] The input shaft portion 15 has a cylindrical shape.

[0064] The input flange portion 16 protrudes from the outer peripheral surface of the end portion on the other axial side of the input shaft portion 15 toward the radial outside over the entire circumference.

[0065] The input side engaging portion 14 protrudes toward the other axial side from the portion of the side surface of the input flange portion 16 that is away from the radial outside from the center of rotation O.

[0066] The input side engaging portion 14 is configured to engage with the input side engaging portion 34 of the engaging member 5, and the shape thereof is not limited. Also, the number of input side engaging portions 14 is determined in accordance with the number of engaging members 5, and in the case where the engaging member 5 is composed of a plurality of engaging members 5, the input side engaging portion 14 is also composed of a plurality of input side engaging portions 14.

[0067] In the reverse input cut clutch 1 of the present example, the engaging member 5 is composed of two engaging members 5. Therefore, the input side engaging portion 14 is composed of two input side engaging portions 14 in correspondence with the number of engaging members 5. The two input side engaging portions 14 are disposed at two positions on the diametrically opposite sides of the side surface on the other axial side of the input flange portion 16, and are separated from each other with respect to the radial direction of the input member 3. Also, each of the input side engaging portions 14 has a shape that is symmetrical in the circumferential direction.

[0068] In the present example, each of the input side engaging portions 14 has a substantially sector-shaped or substantially trapezoidal end surface shape in which the circumferential width increases toward the radial outside when viewed in the axial direction. The radial inside surface 17 of each of the input side engaging portions 14 is composed of flat surfaces that are parallel to each other, and the radial outside surface 18 of each of the input side engaging portions 14 has a cylindrical surface-like profile shape that is the same as the outer peripheral surface of the input flange portion 16. The two circumferential side surfaces 19 of each of the input side engaging portions 14 are composed of flat surfaces that are inclined in a direction in which they separate from each other toward the radial outside. The radial inside surface 17 and the circumferential side surface 19 are connected by a curved surface portion 20 that has a substantially circular arc-shaped profile shape when viewed in the axial direction.

[0069] The input member 3 is rotatably supported by the pressing member 2 or the above-described fixed portion. In the present example, the input member 3 is rotatably supported on the inside of the above-described input side element by a radial bearing.

[0070] The output member 4 has an output side engaging portion 21 that is disposed on the radial inside of the pressing surface 7, on the radial inside of the input side engaging portion 14, and is disposed coaxially with the pressing surface 7. That is, the output member 4 is also disposed coaxially with the input member 3. The output member 4 is connected to an output side mechanism such as a reduction mechanism, and is configured to output torque to the output side mechanism in conjunction with rotation thereof.

[0071] The output-side engaging portion 21 is radially inward compared to the input-side engaging portion 14, but has a portion that moves radially outward from the rotation center O of the output component 4. This portion is positioned to engage with the output-side engaging portion 35 of the engaging member 5. The output-side engaging portion 21 is configured such that, with rotation of the output component 4 or the engaging member 5, the aforementioned portion engages with the output-side engaging portion 35.

[0072] In this example, the output component 4 has an output shaft portion 22, an output flange portion 23, and a small diameter shaft portion 24, in addition to the output side engaging portion 21.

[0073] The output shaft 22 has a stepped cylindrical shape.

[0074] The output flange 23 protrudes radially outward from the outer peripheral surface of the end on one side of the output shaft 22 throughout the entire circumference.

[0075] The output-side engaging portion 21 protrudes from the center of the side portion on the axial side of the output shaft portion 22 toward the axial side.

[0076] The output-side engaging portion 21 can be configured to have a portion that engages with the output-side engaging portion 35, and its shape is not limited. Furthermore, the number of portions in the output-side engaging portion 21 that engage with the output-side engaging portion depends on the number of engaging members 5. If multiple engaging members 5 are used, the output-side engaging portion 21 can also be configured to have multiple such engaging portions. Moreover, even if only one engaging member is used, the output-side engaging portion can still have multiple such engaging portions.

[0077] In this example, the output-side engaging portion 21 is configured to have two portions that engage with the output-side engaging portion 35, corresponding to the number of engaging members 5.

[0078] In this example, the output-side engaging portion 21 has an end face shape that is generally rectangular or generally oblong when viewed axially, and protrudes from the center of the end face on the axial side of the output shaft portion 22 toward the axial side. That is, the distance from the rotation center O of the output member 4 to the outer peripheral surface of the portion engaged with the output-side engaging portion 35, i.e., the output-side engaging portion 21, is not constant in the circumferential direction. Therefore, the output-side engaging portion 21 has a cam function.

[0079] More specifically, the outer peripheral surface of the output-side engaging portion 21 is composed of two parallel flat surfaces 25 and two convex curved surfaces 26, each having a partially cylindrical shape. Therefore, the distance from the rotation center O of the output component 4 to the outer peripheral surface of the output-side engaging portion 21 is not constant in the circumferential direction. The two convex curved surfaces 26 are each composed of a partially cylindrical surface centered at the rotation center O of the output component 4.

[0080] The output-side engaging portion 21 is symmetrical with respect to an imaginary plane that passes through the rotation center O of the output component 4 and is orthogonal to the flat surface 25. Furthermore, the output-side engaging portion 21 is symmetrical with respect to an imaginary plane that passes through the rotation center O of the output component 4 and is parallel to the flat surface 25.

[0081] Such an output-side latching part 21 is disposed between the two input-side latching parts 14.

[0082] The small-diameter shaft portion 24 has a cylindrical shape and protrudes from the center of one axial side of the output-side engagement portion 21 toward the axial side.

[0083] The output component 4 can be rotatably supported by the pressed component 2 or the aforementioned fixed part. In this example, the output component 4 is rotatably supported on the radially inner side of the output side element 8 of the pressed component 2 by a radial rolling bearing 27. The outer ring 28 of the radial rolling bearing 27 is embedded without wobbling in the small-diameter cylindrical portion 10 of the output side element 8, and is axially held between the side of the inward flange portion 12 on one axial side and the retaining ring 29a fixed to the end of the small-diameter cylindrical portion 10 on one axial side. The inner ring 30 of the radial rolling bearing 27 is embedded without wobbling in the end of the output shaft portion 22 on one axial side, and is axially held between the side of the output flange portion 23 on the other axial side and the retaining ring 29b fixed to the outer circumferential surface of the axial middle portion of the output shaft portion 22.

[0084] Furthermore, in the illustrated example, the radial rolling bearing 27 is constructed from a ball bearing that uses balls as rolling elements 31. The radial rolling bearing used to support the output component 4 can also be constructed from tapered roller bearings that use tapered rollers as rolling elements or roller bearings that use cylindrical rollers as rolling elements.

[0085] Furthermore, the small-diameter shaft 24 of the output component 4 is supported on the inside of the input component 3 by a sliding bearing (sleeve) 32 that allows it to rotate freely relative to the input component 3.

[0086] The engaging member 5 has a pressing surface 33 opposite to the pressed surface 7, an input-side engaging part 34 that can engage with the input-side engaging part 14, and an output-side engaging part 35 that can engage with the output-side engaging part 21, and is configured to be movable in a first direction relative to the pressing surface 7 in a near-far direction.

[0087] The engaging member 5 is configured such that if a torque is input to the input member 3, the input-side engaging part 14 engages with the input-side engaged part 34. Based on this, it moves in the first direction away from the pressed surface 7, and the output-side engaged part 35 engages with the output-side engaging part 21, thereby transmitting the torque input to the input member 3 to the output member 4. Conversely, if a torque is input to the output member 4 in the opposite direction, the output-side engaging part 21 engages with the output-side engaged part 35. Based on this, the pressing surface 33 is pressed against the pressed surface 7, causing the pressing surface 33 and the pressed surface 7 to engage friably.

[0088] The snap-fit ​​component 5 can be composed of one snap-fit ​​component 5 having such a structure, or it can be composed of two or more snap-fit ​​components 5.

[0089] In this example, the engaging member 5 is composed of two engaging members 5. Each engaging member 5 has the function of being an engaging member 5. Each engaging member 5 has an end face shape that is approximately semi-circular when viewed from the axial direction, and has a width direction ( Figure 5 The shape is symmetrical in the direction indicated by the middle arrow B. The structure of each snap-fit ​​component 5 will be described below.

[0090] In this example, the radial direction of the engaging element 5 is the direction of distance between the pressing surface 33 and the pressed surface 7, which is equivalent to... Figure 5 The direction indicated by arrow A. The width direction of the engaging component 5 refers to the direction orthogonal to both the near and far directions of the pressing surface 33 relative to the pressed surface 7 and the axial direction of the input component 3, which is equivalent to... Figure 5 The direction indicated by the middle arrow B. In this example, the radial direction of the engaging member 5 corresponds to the first direction, and the width direction of the engaging member 5 corresponds to the second direction.

[0091] The pressing surface 33 is provided on the radially outer side of the engaging member 5 opposite to the pressed surface 7. In this example, the pressing surface 33 is composed of two pressing surfaces 33 located at two circumferentially separated positions on the radially outer side of the engaging member 5. Each pressing surface 33 is composed of a locally cylindrical convex curved surface having a radius of curvature smaller than that of the pressed surface 7.

[0092] The portion of the outer radial surface of the engaging member 5 that separates from the two pressing surfaces 33 in the circumferential direction is located radially inward compared to the imaginary circle centered on the central axis O of the input member 3 and in contact with the two pressing surfaces 33 when viewed from the axial direction. That is, when the two pressing surfaces 33 are in contact with the pressed surface 7, the portion that separates from the two pressing surfaces 33 in the circumferential direction does not contact the pressed surface 7.

[0093] The pressing surface 33 preferably has a surface characteristic that has a larger coefficient of friction relative to the pressed surface 7 than that of other parts of the engaging member 5. Furthermore, the pressing surface 33 can be integrally formed with other parts of the engaging member 5, or it can be formed by the surface of a friction material that is fixed to other parts of the engaging member 5 by means of adhesive bonding or other means.

[0094] In this example, the input-side engaging portion 34 is provided at the radial midpoint of the central portion of the engaging member 5 in the width direction. More specifically, the input-side engaging portion 34 is formed by a through hole having an opening shape that is generally arcuate when viewed from the axial direction, and passes through the radial midpoint of the central position in the width direction of the engaging member 5 in the axial direction, but is not limited thereto.

[0095] The input-side engaging portion 34 is sized to allow loose insertion into the input-side engaging portion 14. Therefore, when the input-side engaging portion 14 is inserted into the inner side of the input-side engaging portion 34, gaps exist between the input-side engaging portion 14 and its inner surface in both the width and radial directions of the engaging member 5. Consequently, the input-side engaging portion 14 can be displaced relative to the input-side engaging portion 34 in the rotational direction of the input member 3, and the input-side engaging portion 34 can be displaced relative to the input-side engaging portion 14 in the radial direction of the engaging member 5.

[0096] The input side engaging part 34 can be configured to engage with the input side engaging part 14, and its shape is not limited.

[0097] In this example, the radially inner surface 36 of the inner surface of the input-side engaging portion 34, facing radially outward, is formed by a flat surface orthogonal to the first direction, and the radially outer surface 37 of the inner surface of the input-side engaging portion 34, facing radially inward, is formed by a composite surface having a generally V-shaped profile when viewed from the axial direction. Specifically, the radially outer surface 37 has a partially cylindrical concave curved surface 38 at its middle portion in the width direction of the engaging member 5, and its two side portions in the width direction of the engaging member 5 have two inclined surfaces 39 that are more inclined in the radial direction towards the inward as they are further separated from each other in the width direction of the engaging member 5. The circumferential surface 40 connecting the ends of the radially inner surface 36 in the second direction to the ends of the radially outer surface 37 in the second direction is formed by a partially cylindrical concave curved surface.

[0098] In this example, the output-side engaging portion 35 is provided at the center of the radially inner side surface of the engaging member 5 in the width direction. The output-side engaging portion 35 is configured to engage with the output-side engaging portion 21, and its shape is not limited.

[0099] In this example, the engaging member 5 has a flat surface 41 on its radially inner side that is orthogonal to the radial direction of the engaging member 5, and two protrusions 42 protruding radially inward at two locations in the width direction of the flat surface 41. Furthermore, the output-side engaging portion 35 is formed by the portion of the flat surface 41 located between the two protrusions 42 in the width direction. In addition, in this example, the width dimension of the output-side engaging portion 35, i.e., the distance between the two protrusions 42, is larger than the width dimension of the flat surface 25 of the output-side engaging portion 21.

[0100] In the reverse input cut-off clutch 1 of this example, with the pressing surfaces 33 of the two engaging members 5 facing opposite sides radially and the flat surfaces 41 facing each other, each engaging member 5 is arranged radially inside the pressed member 2 in a first direction that corresponds to the distance between the pressing surface 33 and the pressed surface 7. Furthermore, the two input-side engaging portions 14 of the input member 3, located on one axial side, are axially inserted into the respective input-side engaging portions 34 of the two engaging members 5, and the output-side engaging portions 21 of the output member 4, located on the other axial side, are axially inserted between the output-side engaging portions 35 of the two engaging members 5. That is, the two engaging members 5 are configured to clamp the output-side engaging portions 21 from the radial outside using the respective output-side engaging portions 35.

[0101] With the two engaging members 5 positioned radially inside the pressed member 2, the inner diameter of the pressed member 2 and the radial dimension of the engaging members 5 are limited in such a way that at least one of the portions between the pressed surface 7 and the two pressing surfaces 33, and between the portions between the front ends of the two combinations of the protrusions 42 formed by the two engaging members facing each other, exists.

[0102] The leaf spring 6 is disposed on both sides of the input side engaging portion 14 in the second direction, and has two clamping portions 43 that are elastically clamped between the input side engaging portion 14 and the input side engaging portion 34, and a base portion 44 that connects the two clamping portions 43 to each other.

[0103] The two clamping portions 43 impart elastic force to the input-side engaging portion 14, having components facing each other in the second direction and components pointing outward in the radial direction of the engaging member 5. Furthermore, the two clamping portions 43 impart elastic force to the engaging member 5, having components separating from each other in the second direction and components pointing inward in the radial direction of the engaging member 5.

[0104] In this example, each clamping portion 43 has a discontinuity at a location in its circumference, and has a notched cylindrical shape with a radius of curvature on its outer circumference that is slightly smaller than the circumferential side surface 40 of the input-side clamping portion 34. Furthermore, in the illustrated example, each clamping portion 43 has an end face shape that is approximately 3 / 4 arc when viewed from the axial direction, but is not limited to this.

[0105] The base 44 is disposed between the radially outer surface 18 of the input-side engaging portion 14 and the radially outer surface 37 of the input-side engaged portion 34, connecting the base ends of the two clamped portions 43 to each other, that is, the ends of the two clamped portions 43 on both sides in the circumferential direction that are farther apart in the second direction.

[0106] In this example, the base 44 has an end face shape that is approximately V-shaped when viewed from the axial direction. Specifically, the middle portion of the base 44 in the second direction has a partially cylindrical curved portion 45, and the two side portions in the second direction have two inclined plate portions 46 that are more inclined in the first direction toward the direction away from the pressed surface 7 as they are further apart from each other in the second direction.

[0107] The leaf spring 6 is disposed inside the input-side engaging portion 34 in a state where its base 44 is elastically deformed to bring the two clamped portions 43 closer together, and each clamped portion 43 is clamped between the circumferential side surface 19 and the circumferential side surface 40 of the input-side engaging portion 14 in a state of elastic compression (diameter reduction). Therefore, based on the intention of each clamped portion 43 to elastically return to its original position in a manner of diameter expansion, the outer peripheral surface near the front end of the clamped portion 43 is elastically pressed against the circumferential side surface 19 of the input-side engaging portion 14.

[0108] Furthermore, based on the fact that the base 44 is to elastically return to the direction that separates the two clamped portions 43 from each other, and that each clamped portion 43 is to elastically return to the position in a manner that expands its diameter, the portion of the outer peripheral surface of each clamped portion 43 that is located on the side that is roughly opposite to the portion that abuts against the circumferential side surface 19 in the radial direction of the clamped portion 43 is elastically pressed against the circumferential side surface 40 of the input side engaging portion 34.

[0109] With the leaf spring 6 positioned inside the input-side engaging portion 34, at least one location of the radially outer surface of the base 44 abuts against the radially inner radially outer surface 37 of the input-side engaging portion 34. In this example, the radially outer surface of the curved portion 45 abuts against the concave curved surface 38 of the radially outer surface 37 of the input-side engaging portion 34.

[0110] In this example, the leaf spring 6 has a symmetrical shape in the second direction. Therefore, the spring characteristics of the two clamping portions 43 are identical. Furthermore, the axial width of the two clamping portions 43 is identical to the axial width of the base 44. Additionally, the axial width of the two clamping portions 43 and the axial width of the base 44 are approximately the same as the axial thickness of the engaging member 5.

[0111] Furthermore, it is possible to make the axial width dimensions of the two clamped parts and the axial width dimension of the base smaller or larger than the axial thickness of the engaging member. Also, it is possible to make the axial width dimensions of the two clamped parts and the axial width dimension of the base different from each other.

[0112] The leaf spring 6 also has a limiting part 47 that limits relative displacement in the axial direction relative to the engaging member 5.

[0113] The limiting part 47 has a bent piece 48 that is bent from the ends of the two clamped parts 43 or the base 44 on both axial sides, and is disposed on both axial sides of the peripheral portion of the input side clamped part 34 in the engaging member 5.

[0114] In this example, the limiting portion 47 has four bent tabs 48, which are bent from the ends of the inclined plate portions 46 constituting the base 44 on both axial sides toward the radially outer side of the engaging member 5, and are disposed on both axial sides of the portion of the engaging member 5 located on the radially outer side of the inclined surface portion 39. In other words, the portion of the engaging member 5 located on the radially outer side of the inclined surface portion 39 is clamped from both axial sides by the bent tabs 48, limiting the relative axial displacement of the leaf spring 6 with respect to the engaging member 5.

[0115] Such a leaf spring 6 is manufactured as a whole by performing stamping and bending processes on elastic metal plates such as steel plates.

[0116] The reverse input cut-off clutch 1 in this example also includes a force-applying component 49, two spacers 50, and a limiting component 51 as optional constituent elements.

[0117] The force-applying component 49 is disposed between the output-side engaging portion 21 of the output component 4 and the engaging member 5, and elastically applies force to the engaging member 5 in a first direction in the direction that brings the pressing surface 33 closer to the pressed surface 7. In this example, the force-applying component 49 is composed of two force-applying components 49 respectively disposed between the radially inner surfaces of the two engaging members 5 and the output-side engaging portion 21 of the output component 4.

[0118] Each force-applying component 49 is composed of a leaf spring having two arms 52 and two connecting portions 53. Each arm 52 has an open cut at its front end and has a generally U-shaped top view when viewed from the plate thickness direction (radial of the engaging member 5). Each connecting portion 53 is composed of a rectangular plate that connects the axial ends of the base ends of the two arms 52 to each other.

[0119] Each force-applying component 49 is supported by the engaging member 5 by engaging the cutouts formed on the two arms 52 with the two protrusions 42 of the engaging member 5. In this example, regardless of the positional relationship between each engaging member 5 and the output-side engaging portion 21, specifically the radial position of each engaging member 5 and the rotational phase of the output-side engaging portion 21 relative to each engaging member 5, the output-side engaging portion 21 elastically abuts against the two connecting portions 53 constituting each force-applying component 49. This suppresses any wobble between the output-side engaging portion 21 and the output-side engaged portion 35.

[0120] Furthermore, the force-applying component only needs to elastically apply force to the engaging member in the direction that brings the pressing surface closer to the pressed surface, and it can quickly switch to a locked or semi-locked state when a torque is input to the output component in the opposite direction; its shape is not particularly limited. For example, the force-applying component can also be made of a torsion coil spring that is elastically compressed and clamped between the radially inner surfaces of the two engaging members.

[0121] Each spacer 50 is configured as a flat plate and has an end face shape that is approximately oblong or approximately rectangular when viewed from the axial direction. Each spacer 50 has a through hole 54 that allows the output-side engaging portion 21 to pass through without wobbling. Each spacer 50 is disposed on both axial sides of the two engaging members 5 in a state in which the output-side engaging portion 21 is inserted through each through hole 54 without wobbling.

[0122] The limiting member 51 is composed of a notched annular retaining ring. That is, the limiting member 51 has an end face shape that is approximately C-shaped when viewed from the axial direction.

[0123] The limiting member 51 is locked onto the end of the small-diameter shaft 24 on the other side of the axial direction. This prevents displacement of the spacer 50 on the axial side of the two spacers 50. In this example, the force-applying member 49, which supports the two engaging members 5, is axially clamped between the side of the output flange 23 on the axial side and the limiting member 51 via the two spacers 50, thereby preventing relative axial displacement of the two engaging members 5 relative to the output member 4.

[0124] <Instructions for Reverse Input Clutch Disengagement>

[0125] use Figure 6 and Figure 7 The operation of the reverse input disengagement clutch 1 in this example will be explained. Furthermore, Figure 6and Figure 7 The leaf spring 6 and the force-applying component 49 are omitted, and the radial gap between the input component 3 and the output component 4 and the two engaging components 5 is exaggerated.

[0126] If torque is input to input component 3, regardless of the rotation direction of input component 3, the two engaging parts 5 move away from the pressed surface 7. More specifically, as... Figure 6 As shown, the input-side engaging portion 14 overcomes the reaction force exerted on the input-side engaging portion 14 by the two clamping portions 43 disposed on both sides of the input-side engaging portion 14 in the second direction, which are disposed on the front side of the input-side engaging portion 14 in the rotational direction of the input component 3. While elastically compressing the clamping portion 43 disposed on the front side, the input-side engaging portion 34 is located inside the input-side engaging portion 34 along the rotational direction of the input component 3 (in the direction of rotation of the input component 3). Figure 6 In the example, the rotation is counterclockwise.

[0127] This reduces the gap between the radial inner surface 17 of the input-side engaging portion 14 and the radial inner surface 36 of the input-side engaged portion 34, allowing the radial inner surface 17 of the input-side engaging portion 14 to contact the radial inner surface 36 of the input-side engaged portion 34.

[0128] If the input component 3 is rotated further from this state, the radially inner surface 17 of the input-side engaging portion 14 presses the radially inner surface 36 of the input-side engaging portion 34 towards the radially inner side, thereby causing the engaging member 5 to move away from the pressed surface 7. That is, based on their engagement with the input component 3, the two engaging members 5 move towards each other in a direction that approaches each other radially inward, and the radially inner surfaces of the two engaging members 5 approach each other, so that the output-side engaging portion 21 of the output component 4 is clamped from both radial sides by the output-side engaging portion 35 of the two engaging members 5.

[0129] In this way, while the output component 4 is rotated with the flat surface 25 of the output-side engaging portion 21 parallel to the flat surface 41 of the engaging member 5, the output-side engaging portion 21 and the output side of the engaging member 5 are engaged without wobbling by the engaging portion 35. As a result, the torque input to the input component 3 is transmitted to the output component 4 via the two engaging members 5 and output from the output component 4.

[0130] If a reverse torque is input to the output component 4, the two engaging parts 5 move towards the pressed surface 7, regardless of the rotation direction of the output component 4. More specifically, as... Figure 7 As shown, the output-side engaging portion 21 is located on the output side of the two engaging members 5, and the engaging portion 35 is located on the inner side of each other along the rotation direction of the output member 4 (in the direction of rotation of the output member 4). Figure 7In the example, the rotation is clockwise. The output-side engaged part 35 is pressed radially outward by the connection (corner) between the flat surface 25 and the convex curved surface 26 on the outer peripheral surface of the output-side engaged part 21, and the two engaged parts 5 move toward the pressed surface 7.

[0131] That is, based on the engagement with the output component 4, the two engaging parts 5 move radially outward in the direction of separation from each other, and the pressing surface 33 of the two engaging parts 5 contacts the pressed surface 7 and engages with the pressed surface 7 through friction.

[0132] As a result, the torque input to output component 4 in the reverse direction is completely cut off and not transmitted to input component 3, or only a portion of the torque input to output component 4 in the reverse direction is transmitted to input component 3 and the remainder is cut off.

[0133] In order to completely cut off the torque input to the output component 4 without transmitting it to the input component 3, the locking member 5 is supported (clamped) between the output side locking part 21 and the pressed component 2 in such a way that the pressing surface 33 of the locking member 5 does not slide (relative rotate) relative to the pressed surface 7, thereby locking the output component 4.

[0134] In order to transmit only a portion of the torque input to the output component 4 to the input component 3 and cut off the remainder, the locking member 5 is supported (clamped) between the output-side locking part 21 and the pressed component 2 by sliding the pressing surface 33 of the locking member 5 relative to the pressed surface 7, thereby partially locking the output component 4.

[0135] In the reverse input cut-off clutch 1 of this example, the size of the gap between each component is adjusted in a way that allows the above-mentioned actions to be performed. In particular, in the positional relationship between the pressing surface 33 and the pressed surface 7 of the two engaging members 5, there is a gap between the radial inner surface 17 of the input-side engaging portion 14 and the radial inner surface 36 of the input-side engaged portion 34.

[0136] Therefore, when the torque is input to the output component 4 in the reverse direction, the movement of the locking member 5 to the radially outward direction is prevented by the input-side locking part 14, and after the pressing surface 33 contacts the pressed surface 7, the surface pressure acting on the contact part between the pressing surface 33 and the pressed surface 7 varies according to the magnitude of the torque input to the output component 4 in the reverse direction, and the output component 4 is appropriately locked or partially locked.

[0137] According to the reverse input cut-off clutch 1 in this example, for the same reasons as the reverse input cut-off clutch described in International Publication No. 2019 / 026794, the axial dimension can be shortened and the number of components can be reduced.

[0138] In this example, the reverse input cut-off clutch 1 converts the rotation of the input component 3 and the output component 4 into radial movement of the engaging member 5. This conversion of the rotation of the input component 3 and the output component 4 into radial movement of the engaging member 5 allows the engaging member 5 to engage with the output component 4 located radially inside the engaging member 5, or to press the engaging member 5 against the pressed component 2 located radially outside the engaging member 5.

[0139] Thus, the reverse input cut-off clutch 1 in this example can switch between an unlocked state that transmits torque from the input component 3 to the output component 4 and a locked state that prevents the output component 4 from rotating or a semi-locked state that inhibits the rotation of the output component 4 based on the radial movement of the engaging member 5 controlled by the rotation of the input component 3 and / or the output component 4. Therefore, the overall axial dimension of the reverse input cut-off clutch 1 can be shortened.

[0140] Furthermore, the engaging member 5 has two functions: transmitting the torque input to the input member 3 to the output member 4 and locking or partially locking the output member 4. Therefore, the number of components required to cut off the reverse input clutch 1 can be reduced, and the operation can be made more stable compared to the case where different components each have the functions of transmitting torque and locking or partially locking.

[0141] For example, when different components have the functions of transmitting torque and locking or semi-locking, it is possible that the timing of unlocking or semi-locking is staggered from the timing of starting torque transmission. In this case, if a reverse torque is input to the output component during the period from unlocking or semi-locking to the start of torque transmission, the output component will be locked or semi-locked again.

[0142] In this example, since the engaging member 5 has both the function of transmitting torque to the output member 4 and the function of locking or partially locking the output member 4, such an undesirable situation can be prevented.

[0143] Furthermore, since the directions of the force acting on the locking member 5 from the input component 3 and the force acting on the locking member 5 from the output component 4 are opposite, the movement direction of the locking member 5 can be controlled by limiting the magnitude relationship between the two forces. Therefore, the switching operation between the locked state, semi-locked state, and unlocked state of the output component 4 can be performed stably and reliably.

[0144] In particular, in the reverse input cut-off clutch 1 of this example, the two clamping portions 43 constituting the leaf spring 6 are arranged on both sides of the input-side engaging portion 14 in the second direction, and are elastically clamped between the input-side engaging portion 14 and the input-side engaged portion 34. Therefore, when the input component 3 rotates, the clamping portion 43 that is arranged in the rotation direction of the input component 3 on the front side of the input-side engaging portion 14 needs to be elastically compressed to overcome the reaction force exerted by the torsion coil spring 6 on the input-side engaging portion 14.

[0145] Therefore, even when the circumferential clearance between the input-side engaging portion 14 and the input-side engaged portion 34 is ensured to a certain extent to guarantee the workability of the assembly operation of the reverse input cut-off clutch 1, the wobbling of the input component 3 relative to the engaging member 5 can be suppressed. Therefore, according to the reverse input cut-off clutch 1 of this example, even when the lock is released or partially released, it is possible to prevent the input-side engaging portion 14 and the input-side engaged portion 34 from colliding violently, thereby preventing the generation of harsh noise based on the collision between the input-side engaging portion 14 and the input-side engaged portion 34.

[0146] In this example, as described above, the leaf spring 6 used to suppress the wobbling of the input component 3 is integrally manufactured by performing a stamping and bending process on an elastic metal plate. Therefore, for example, compared to the case where two torsion coil springs are respectively arranged on both sides of the input-side engagement portion in the second direction, the number of components can be reduced, and the manufacturing cost of the reverse input cut-off clutch 1 can be easily reduced.

[0147] In the reverse input cut-off clutch 1 of this example, the two clamping parts 43 apply a spring force to the input-side engaging part 14, which has components facing each other in the second direction. Furthermore, the spring constant, free length, and other spring characteristics of the two clamping parts 43 are made the same. Therefore, in a neutral state where no torque is applied to either the input component 3 or the output component 4, the input-side engaging part 14 can be positioned at the center of the input-side engaging part 34 in the second direction.

[0148] In other words, regardless of the rotation direction of the input component 3, the circumferential gap between the input-side engaging portion 14 and the input-side engaged portion 34 can be kept the same. Therefore, when the direction of the torque input to the input component 3 is reversed, it is possible to prevent the circumferential gap between the input-side engaging portion 14 and the input-side engaged portion 34 from increasing, and to prevent the input component 3 from wobbling more.

[0149] In cases where a high responsiveness is required only for rotation in one direction of the input component 3 and not for rotation in other directions, the spring characteristics of the two clamping parts disposed between the interlocking input-side engaging part and the interlocking input-side engaging part can be made to be different.

[0150] By differentiating the spring characteristics of the two clamping parts, in a neutral state where no torque is applied to either the input or output component, the circumferential gap between the input-side engaging part and the input-side engaged part, where the gap exists on the front side when the input component rotates in one direction, is smaller than the gap exists on the front side when the input component rotates in other directions. Therefore, the responsiveness when the input component rotates in one direction can be improved.

[0151] Furthermore, the reverse input cut-off clutch 1 in this example can improve the workability of the assembly operation.

[0152] When assembling the reverse input cut-off clutch 1, firstly, the input component 3 is rotatably supported inside the aforementioned input-side element, and the output component 4 is rotatably supported inside the output-side element 8 using the radial rolling bearing 27. Furthermore, a leaf spring 6 is assembled inside the input-side engaging portion 34 of the engaging member 5, and a force-applying component 49 is assembled at the radially inner end of the engaging member 5.

[0153] Next, the small-diameter shaft portion 24 and the output-side engaging portion 21 of the output component 4 are inserted from the other side into the through hole 54 of the spacer 50 on the other side of the axial direction, so that the side of the spacer 50 on the other side of the axial direction abuts against the side of the output flange portion 23 on the axial direction.

[0154] Next, two engaging parts 5, each equipped with a leaf spring 6 and a force-applying component 49, are positioned between the output-side engaging part 21 of the output component 4 and the pressed surface 7 on the inner circumferential surface of the output-side element 8.

[0155] Then, with the two input-side engaging portions 14 of the input component 3, which are rotatably supported inside the input-side element, aligned circumferentially with the input-side engaged portions 34 of the two engaging members 5, the input component 3, the input-side element, the output component 4, and the output-side element 8 are displaced axially in a direction that brings them closer to each other. This causes the input-side element to fit securely into the output-side element 8 without wobbling, and the two input-side engaging portions 14 are inserted into each input-side engaged portion 34. Then, the input-side element and the output-side element 8 are joined together using a connecting member, thereby assembling the reverse input cut-off clutch 1.

[0156] In the reverse input cut-off clutch 1 of this example, at least one position of the radially outer surface of the base 44 constituting the leaf spring 6 abuts against the radially inner radially outer surface 37 of the input-side engaging portion 34. Specifically, in this example, the radially outer surface of the curved portion 45 abuts against the concave curved surface 38 of the radially outer surface 37 of the input-side engaging portion 34. Therefore, before inserting the input-side engaging portion 14 of the input member 3 into the input-side engaging portion 34, the leaf spring 6 can be positioned inside the input-side engaging portion 34. Consequently, the operation of inserting the input-side engaging portion 14 into the input-side engaging portion 34 is easier, improving the workability of assembling the reverse input cut-off clutch 1.

[0157] Furthermore, the order in which the reverse input cut-off clutch 1 is assembled can be changed or implemented simultaneously, provided that no contradiction arises.

[0158] The reverse input cut-off clutch 1 of this example includes a force-applying member 49 that elastically applies force to the engaging member 5 in a first direction, in the direction that brings the pressing surface 33 closer to the pressed surface 7. Therefore, according to the reverse input cut-off clutch 1 of this example, when torque is input in the reverse direction to the output member 4, it can quickly switch to a locked state or a semi-locked state. That is, according to the reverse input cut-off clutch of this example, locking performance can be well ensured.

[0159] In the reverse input cut-off clutch 1 of this example, the elastic force exerted on the engaging member 5 by the two clamping parts 43 includes a component in the first direction that moves the pressing surface 33 away from the pressed surface 7. In this example, the component in the first direction of the elastic force exerted on the engaging member by the force-applying member 49 that moves the pressing surface 33 closer to the pressed surface 7 is greater than the component in the first direction of the elastic force exerted on the engaging member 5 by the two clamping parts 43 that moves the pressing surface 33 away from the pressed surface 7. Therefore, even when the leaf spring 6 is provided, in a neutral state where no torque is applied to either the input member 3 or the output member 4, it is possible to elastically apply force to the engaging member 5 in the first direction that moves the pressing surface 33 closer to the pressed surface 7.

[0160] In this example, the engaging portion 34 on the input side of the engaging member 5 is formed by a through hole that extends axially through the engaging member 5. However, in the implementation of this disclosure, for example, as Figure 12 As shown, the input-side engaging portion 34a can also be formed by a cut that opens on the radially outer side of the engaging member 5a. Alternatively, the input-side engaging portion can also be formed by a bottomed hole that opens only on one axial side of the engaging member.

[0161] In implementing this disclosure, there are no particular limitations on the materials of the input component, output component, pressed component, and engaging component. For example, in addition to metals such as iron alloys, copper alloys, and aluminum alloys, synthetic resins mixed with reinforcing fibers can be used as materials for these components, as needed. Furthermore, the same material can be used for each component of the input component, output component, pressed component, and engaging component, or different materials can be used.

[0162] When implementing this disclosure, if a reverse torque is input to the output component, lubricant can be applied to the contact portions of the input component, output component, pressed component, and engaging component, provided that the output component meets the locking or semi-locking conditions. Alternatively, at least one of the input component, output component, pressed component, and engaging component can be made of oil-impregnated metal.

[0163] [Second Example]

[0164] use Figure 13 and Figure 14 A second example of an embodiment of this disclosure will be described. The difference between this example and the first example lies in the shape of the opening of the input-side engaging portion 34b of the engaging member 5b and the shape of the leaf spring 6a.

[0165] In this example, the radially inner surface 36 of the inner surface of the input-side engaging portion 34b, facing radially outward, is formed by a flat surface orthogonal to the first direction. Furthermore, the radially outer surface 37a of the inner surface of the input-side engaging portion 34b, facing radially inward, has a partially cylindrical concave curved surface 38a at its midpoint in the second direction, and has flat surfaces 55 orthogonal to the radial direction of the engaging member 5b at its second two side portions. The circumferential surface 40 connecting the ends of the radially inner surface 36 and the ends of the radially outer surface 37a in the second direction is formed by a partially cylindrical concave curved surface.

[0166] The leaf spring 6a has two clamping parts 43a, a base 44a, and a limiting part 47a.

[0167] Each clamping part 43a has an end face shape that is approximately half an arc when viewed from the axial direction. Each clamping part 43a is clamped between the circumferential side surface 19 of the input side engaging part 14 and the circumferential side surface 40 of the input side engaging part 34b in a state of elastically reduced diameter.

[0168] The base 44a has a curved portion 56, two flat plate portions 57 and two inclined plate portions 58.

[0169] The bent portion 56 is bent in a partially cylindrical shape so that the outer radial side of the engaging member 5b is convex.

[0170] Each flat plate portion 57 is provided in the second direction on the portion adjacent to both sides of the curved portion 56, and is composed of a rectangular flat plate orthogonal to the first direction.

[0171] Each inclined plate portion 58 is bent at an obtuse angle from the end of the two plate portions 57 on the more distant side in the second direction toward the direction away from the pressing surface 7 in the first direction.

[0172] The limiting part 47a has four bent pieces 48a, which are bent radially outward from the ends on both sides of the axial direction of each inclined plate part 58 and are disposed on both sides of the portion of the engaging member 5b located around the circumferential side 40.

[0173] The leaf spring 6a is positioned inside the input-side engaging portion 34b in a state where the bent portion 56 in the base 44a is elastically deformed in order to bring the two clamped portions 43a closer together, and each clamped portion 43a is clamped between the circumferential side surface 19 of the input-side engaging portion 14 and the circumferential side surface 40 of the input-side engaging portion 34b in an elastically compressed state. Therefore, based on the intention of each clamped portion 43a to elastically return to its original position by expanding its diameter, the outer peripheral surface near the front end of the clamped portion 43a is elastically pressed against the circumferential side surface 19 of the input-side engaging portion 14. Furthermore, based on the fact that the bent portion 56 is to elastically return to the direction that moves the two clamped portions 43a away from each other, and that each clamped portion 43a is to elastically return to the position by expanding its diameter, the portion of the outer peripheral surface of each clamped portion 43a located on the side that is roughly opposite to the portion that abuts against the circumferential side surface 19 in the radial direction of the clamped portion 43a is elastically pressed against the circumferential side surface 40 of the input side engaging portion 34b.

[0174] In this example, with the leaf spring 6a assembled inside the input-side engaging portion 34b, the radially outer surface of the flat plate portion 57 elastically abuts against the flat surface 55 in the radially outer surface 37a of the input-side engaging portion 34b. Therefore, before the input-side engaging portion 14 of the input component 3 is inserted into the input-side engaging portion 34b, the leaf spring 6a can be positioned inside the input-side engaging portion 34b. The structure and function of the other parts are the same as in the first example.

[0175] [Third Case]

[0176] use Figure 15 A third example of an embodiment of this disclosure will be described.

[0177] In this example, the two clamping portions 43b constituting the leaf spring 6b apply a spring force to the input-side engaging portion 14 of the input component 3 consisting only of components facing each other in the second direction, and apply a spring force to the engaging member 5 consisting only of components in the direction of separation from each other in the second direction.

[0178] That is, the elastic force exerted by the two clamped parts 43b on the input side engaging part 14 does not include the component in the first direction, and the elastic force exerted by the two clamped parts 43b on the engaging member 5 also does not include the component in the first direction.

[0179] According to this example, since the force applied by the force-applying member 49 to the engaging member 5 in the first direction toward bringing the pressing surface 33 closer to the pressed surface 7 is not hindered by the leaf spring 6b, the spring force of the force-applying member 49 can be suppressed to a small extent. Therefore, the force of the reciprocating clutch 1 (refer to...) can be reduced to a smaller extent. Figures 1-4 The minimum torque required to lock or partially lock the clutch 1 is minimized, ensuring good lock-out performance when switching the reverse input cut-off clutch 1 from the locked or partially locked state to the unlocked state. The structure and function of the other parts are the same as in the first example.

[0180] [Fourth Case]

[0181] use Figure 16 A fourth example of an embodiment of this disclosure will be described.

[0182] In this example, the two clamping portions 43c constituting the leaf spring 6c impart elastic force to the input-side engaging portion 14 of the input component 3, which has components facing each other in the second direction and components that move the pressing surface 33 away from the pressed surface 7 in the first direction. Furthermore, the engaging member 5 is imparted elastic force with components that have components that separate from each other in the second direction and components that move the pressing surface 33 closer to the pressed surface 7 in the first direction.

[0183] According to this example, the two clamping portions 43c constituting the leaf spring 6c can elastically apply force to the engaging member 5 in the first direction in the direction that brings the pressing surface 33 closer to the pressing surface 7. Therefore, the force-applying member 49 can be omitted, or the elastic force of the force-applying member 49 can be suppressed to a small extent. The structure and function of the other parts are the same as in the first example.

[0184] Explanation of symbols

[0185] 1—Reverse input cut-off clutch; 2—Pressed component; 3—Input component; 4—Output component; 5, 5a, 5b—Engaging components; 6, 6a, 6b, 6c—Leaf springs; 7—Pressed surface; 8—Output side component; 9—Large diameter cylindrical surface; 10—Small diameter cylindrical surface; 11—Connecting surface; 12—Inner flange; 13—Threaded hole; 14—Input side engaging component; 15—Input shaft; 16—Input flange; 17—Radial inner surface; 18—Radial outer surface; 19—Circumferential surface; 20—Curved surface; 21—Output side engaging component; 22—Output shaft; 23—Output flange; 24—Small diameter shaft; 25—Flat surface; 26—Convex curved surface; 27—Radial rolling bearing; 28—Outer ring; 29a, 29b—Retaining rings; 3 0—Inner ring, 31—Rolling element, 32—Sliding bearing, 33—Pressing surface, 34, 34a, 34b—Input side engaged portion, 35—Output side engaged portion, 36—Radial inner surface, 37, 37a—Radial outer surface, 38, 38a—Concave curved surface, 39—Inclined surface, 40—Circumferential side, 41—Flat surface, 42—Protrusion, 43, 43a, 43b, 43c—Clamped portion, 44, 44a—Base, 45—Bent portion, 46—Inclined plate portion, 47, 47a—Restricting portion, 48—Bending piece, 49—Force-applying component, 50—Spacer, 51—Limiting component, 52—Arm portion, 53—Connecting portion, 54—Through hole, 55—Flat surface, 56—Bent portion, 57—Flat plate portion, 58—Inclined plate portion.

Claims

1. A reverse input cut clutch characterized by, Possess: pressed member, which has a pressed surface on an inner peripheral surface; input member, which has an input-side engaging portion arranged radially inward of the pressed surface and is arranged coaxially with the pressed surface; output member, which has an output-side engaging portion arranged radially inward of the input-side engaging portion on the radially inward side of the pressed surface and is arranged coaxially with the pressed surface; engaging member, which has a pressed surface opposite the pressed surface, an input-side engaged portion capable of engaging with the input-side engaging portion, and an output-side engaged portion capable of engaging with the output-side engaging portion, and is arranged to be movable in a first direction, which is a direction of approach and departure of the pressed surface with respect to the pressed surface; leaf spring, which is arranged on both sides of the input-side engaging portion in a second direction orthogonal to the central axis of the input member and the first direction, and has two clamped portions elastically clamped between the input-side engaging portion and the input-side engaged portion and a base portion connecting the two clamped portions to each other, the engaging member is configured such that, if torque is input to the input member, the engaging member moves in the first direction away from the pressed surface based on engagement of the input-side engaging portion with the input-side engaged portion, the output-side engaged portion engages with the output-side engaging portion, and torque input to the input member is transmitted to the output member, and conversely, if torque is input in reverse to the output member, the pressed surface is pressed against the pressed surface based on engagement of the output-side engaging portion with the output-side engaged portion, the pressed surface and the pressed surface are frictionally engaged.

2. The reverse input cut clutch according to claim 1, wherein the two clamped portions impart to the input-side engaging portion a spring force having a component in a direction in which the two clamped portions face each other in the second direction and a component in a direction in which the pressed surface approaches the pressed surface in the first direction.

3. The reverse input cut clutch according to claim 2, further comprising: a biasing member that elastically biases the engaging member in the first direction in which the pressed surface approaches the pressed surface, a component of the spring force imparted by the biasing member to the engaging member in the first direction in which the pressed surface approaches the pressed surface is greater than a component of the spring force imparted by the two clamped portions to the engaging member in the first direction in which the pressed surface departs from the pressed surface.

4. The reverse input cut clutch according to claim 1, wherein the two clamped portions impart to the input-side engaging portion a spring force having only a component in a direction in which the two clamped portions face each other in the second direction.

5. The reverse input cut clutch according to claim 1, wherein the two clamped portions impart to the input-side engaging portion a spring force having a component in a direction in which the two clamped portions face each other in the second direction and a component in a direction in which the pressed surface departs from the pressed surface in the first direction.

6. The reverse-input cut-off clutch according to any one of claims 1 to 5, characterized in that the plate spring has a restriction portion that restricts relative displacement in the axial direction with respect to the engagement member.

7. The reverse-input cut-off clutch according to claim 6, characterized in that the restriction portion has bent pieces that are bent from end portions on both sides in the axial direction of the two clamped portions or the base portion, and are disposed on both sides in the axial direction of a peripheral portion of the input-side engaged portion in the engagement member.

8. The reverse-input cut-off clutch according to any one of claims 1 to 7, characterized in that at least one position in the base portion abuts against a portion facing the radially inner side in the inner surface of the input-side engaged portion.

9. The reverse-input cut-off clutch according to any one of claims 1 to 8, characterized in that the engagement member is composed of two engagement members, and the input-side engaged portion is composed of two input-side engaged portions.

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