Reverse input blocking clutch

Abstract

[Problem] To realize a reverse input blocking clutch structure with which it is possible to prevent a stopper member from falling off an output member and to reduce the number of components. [Solution] An output member 4 has an attachment shaft portion 20 that is disposed coaxially with an output-side engaging portion 19 and that protrudes toward one side in the axial direction from the end surface of the output-side engaging portion 19 on said one side in the axial direction. A stopper member 6 has a cylindrical portion 52 that is fitted externally onto the attachment shaft portion 20 of the output member 4, a flange portion 53 that is axially opposed to an end surface 49 of an engaging element 5 on said one side in the axial direction, and a crimped portion 51 that is formed in at least a portion of the cylindrical portion 52 or is connected to at least a portion in the circumferential direction of an end portion of the cylindrical part 52 on said one side in the axial direction, and the stopper member 6 is crimped and fixed to the attachment shaft portion 20 by the crimped portion 51.

Description

Reverse Input Blocking Clutch

[0001] The present disclosure relates to a reverse input blocking clutch that transmits the rotational torque input to an input member to an output member, while completely blocking the rotational torque reversely input to the output member from being transmitted to the input member, or transmitting only a part thereof to the input member and blocking the remainder.

[0002] The reverse input blocking clutch transmits the rotational torque input to an input member connected to an input-side mechanism such as a drive source to an output member connected to an output-side mechanism such as a speed reduction mechanism, while having a function of completely blocking the rotational torque reversely input to the output member from being transmitted to the input member, or transmitting only a part thereof to the input member and blocking the remainder.

[0003] The reverse input blocking clutch includes a lock-type reverse input blocking clutch provided with a mechanism for preventing the rotation of the output member when a rotational torque is reversely input to the output member, and a free-type reverse input blocking clutch provided with a mechanism for idling the output member when a rotational torque is input to the output member, depending on the difference in the mechanism for blocking the rotational torque reversely input to the output member. Which of the lock-type reverse input blocking clutch and the free-type reverse input blocking clutch is used is appropriately determined according to the application of the device incorporating the reverse input blocking clutch.

[0004] In the lock-type reverse input blocking clutch described in International Publication No. 2023 / 136149 pamphlet, when a rotational torque is input to the input member, based on the engagement of the input-side engaging portion of the input member with the input-side engaged portion of the engaging element, the engaging element moves in a direction away from the pressed surface provided on the pressed member, and the output-side engaged portion of the engaging element is engaged with the output-side engaging portion of the output member, thereby transmitting the rotational torque input to the input member to the output member. On the other hand, when a rotational torque is reversely input to the output member, based on the engagement of the output-side engaging portion of the output member with the output-side engaged portion of the engaging element, the engaging element moves in a direction approaching the pressed surface, presses the pressing surface against the pressed surface, and frictionally engages the pressing surface with the pressed surface.

[0005] International Publication No. 2023 / 136149 pamphlet

[0006] In a reverse input blocking clutch, if the axial movement of the engaging element relative to the output member is not restricted, the engaging element may tilt axially. If the engaging element remains tilted axially and moves radially outward, the pressing surface and the pressed surface may come into local contact, causing jamming. This can unnecessarily increase the force required to switch from a locked or semi-locked state to an unlocked or semi-unlocked state, or cause plastic deformation or wear on the pressing surface and / or the pressed surface.

[0007] Therefore, in the reverse input blocking clutch described in International Publication No. 2023 / 136149, the axial movement of the engaging element relative to the output member is restricted by using two spacers and a retaining ring, which is a stopper member. Specifically, by installing spacers on both sides of the engaging element in the axial direction, the axial position of the engaging element is corrected, and by locking the retaining ring to the end of the output member, the axial movement of the engaging element relative to the output member is restricted. Furthermore, in the manufacturing plant of the reverse input blocking clutch, the output member, engaging element, two spacers, and retaining ring are sub-assembled to produce an assembly, and then this assembly is transported to another process.

[0008] The reverse input blocking clutch described in International Publication No. 2023 / 136149 employs a configuration in which a small-diameter retaining ring is locked into a locking groove formed on the outer circumference of the output member. This can lead to problems such as the retaining ring falling off the output member and the assembly disassembling during transport. Furthermore, since spacers are required on both the axial sides of the engaging element, the number of parts increases, leading to higher parts management costs and increased assembly man-hours.

[0009] This disclosure aims to realize a reverse input blocking clutch structure that facilitates the use of stopper members with larger dimensions than conventional stopper members consisting of retaining rings, prevents the stopper member from falling off the output member, and reduces the number of parts.

[0010] A reverse input blocking clutch according to one aspect of the present disclosure comprises a pressed member, an input member, an output member, an engaging element, and a stopper member.

[0011] The member to be pressed has a surface to be pressed on its inner circumferential surface.

[0012] The input member has an input-side engaging portion located radially inward of the pressed surface, is connected to an input-side mechanism on one axial side, and is arranged coaxially with the pressed surface.

[0013] The output member has an output-side engaging portion that is positioned radially inward from the input-side engaging portion, is connected to the output-side mechanism on the other axial side, and is positioned coaxially with the pressed surface.

[0014] The engaging element has a pressing surface facing 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 arranged to allow the pressing surface to move in the near-far direction relative to the pressed surface.

[0015] The stopper member restricts the axial movement of the engaging element relative to the output member.

[0016] When rotational torque is input to the input member, the engaging element moves radially away from the pressed surface based on the input-side engaging portion engaging with the input-side engaged portion, thereby engaging the output-side engaged portion with the output-side engaging portion and transmitting the rotational torque input to the input member to the output member. Conversely, when rotational torque is input in reverse to the output member, the engaging element presses the pressing surface against the pressed surface based on the output-side engaging portion engaging with the output-side engaged portion, causing the pressing surface to frictionally engage with the pressed surface.

[0017] The output member has a mounting shaft portion that protrudes in the axial direction from the end face on one axial side of the output-side engaging portion.

[0018] The stopper member has a cylindrical portion fitted onto the mounting shaft, a flange portion connected to the other axial side of the cylindrical portion and facing the axial end face of the engaging element on one axial side, and a crimping portion formed on at least a part of the cylindrical portion or connected to at least a part of the circumferential direction of the axial end of the cylindrical portion, and is crimped and fixed to the mounting shaft by the crimping portion.

[0019] In a reverse input blocking clutch according to one aspect of the present disclosure, the crimping portion can be connected to one end of the cylindrical portion on the axial side and configured as a projection.

[0020] In this case, the crimping portion can be provided at two locations on opposite sides of the cylindrical portion in the diametrical direction.

[0021] In a reverse input blocking clutch according to one aspect of the present disclosure, the crimping portion can be configured as a continuous annular shape in the circumferential direction.

[0022] In this case, the crimping portion can be connected to one end of the cylindrical portion on the axial side and configured in a conical shape. Alternatively, the crimping portion can be formed in the axial middle portion of the cylindrical portion.

[0023] In a reverse input blocking clutch according to one aspect of the present disclosure, the mounting shaft portion may have an engagement surface on its outer circumferential surface that engages with the crimping portion in the axial direction and faces the other side in the axial direction.

[0024] In this case, the mounting shaft portion may have a recess on its outer surface into which the crimping portion fits, and the engaging surface may be formed by the inner surface of the recess.

[0025] In a reverse input blocking clutch according to one aspect of the present disclosure, the recesses may be provided at two locations on opposite sides in the diametrical direction of the outer circumferential surface of the mounting shaft portion.

[0026] In a reverse input blocking clutch according to one aspect of the present disclosure, there is an axial gap between the axial end face of the engaging element on one side and the axial side of the flange portion on the other side.

[0027] In a reverse input blocking clutch according to one aspect of the present disclosure, the flange portion has a non-circular outer peripheral edge when viewed from the axial direction, and can engage with the input-side engaging portion in the circumferential direction to prevent relative rotation of the stopper member with respect to the output member.

[0028] In a reverse input blocking clutch according to one aspect of the present disclosure, the flange portion may have a circular outer peripheral edge when viewed from the axial direction, and may have an outer diameter smaller than the diameter of the inscribed circle formed by the plurality of input-side engaging portions.

[0029] In a reverse input blocking clutch according to one aspect of the present disclosure, the stopper member abuts against one axial end face of the output-side engaging portion, thereby axially positioning it with respect to the output member.

[0030] In a reverse input blocking clutch according to one aspect of the present disclosure, the mounting shaft portion may have a non-cylindrical shape.

[0031] In this case, the mounting shaft portion may have a cross-sectional shape that is the same as or similar to the end face on one axial side of the output-side engaging portion.

[0032] In a reverse input blocking clutch according to one aspect of the present disclosure, the output member may have an output shaft portion from which the output-side engaging portion protrudes toward the other axial direction from one end face on its axial side. In this case, a spacer can be placed between the axial end face of the output shaft portion and the axial end face of the engaging portion toward the other axial direction.

[0033] According to one embodiment of the reverse input blocking clutch of this disclosure, it is possible to use a stopper member with larger dimensions than a conventional stopper member consisting of a retaining ring, it is possible to prevent the stopper member from falling off the output member, and the number of parts can be reduced.

[0034] Figure 1 is a cross-sectional view of a first example reverse input shut-off clutch according to the embodiments of this disclosure. Figure 2 is a cross-sectional view taken along line I-I in Figure 1. Figure 3 is a partially enlarged view of Figure 1. Figure 4 is a partially enlarged view of Figure 2. Figure 5 is a perspective view showing one axial side portion of the first example reverse input shut-off clutch, with the pressed member and input member omitted. Figure 6 is a perspective view from Figure 5, with the stopper member omitted. Figure 7 is a cross-sectional view taken along line II-II in Figure 1. Figure 8 is a cross-sectional view taken along line II-II in Figure 1, showing the state in which rotational torque is input to the input member, with the biasing member omitted. Figure 9 is a cross-sectional view taken along line II-II in Figure 1, showing the state in which rotational torque is input to the output member, with the biasing member omitted. Figure 10 is a perspective view showing the stopper member removed from the first example reverse input shut-off clutch before the crimped portion is crimped. Figure 11 is a diagram corresponding to Figure 3, showing a second example reverse input shut-off clutch according to the embodiments of this disclosure. Figure 12 is a perspective view corresponding to Figure 5, showing a second example of a reverse input cutoff clutch.

[0035] [First Example] A first example of a reverse input interruption clutch according to the embodiments of this disclosure will be described with reference to Figures 1 to 10.

[0036] In the following description, unless otherwise specified, the axial, radial, and circumferential directions refer to the axial, radial, and circumferential directions of the pressed surface 7. The axial, radial, and circumferential directions of the pressed surface 7 coincide with the axial, radial, and circumferential directions of the input member 3, and also coincide with the axial, radial, and circumferential directions of the output member 4. Furthermore, one axial side refers to the input side of the reverse input blocking clutch 1 (the right side in Figures 1 to 4), and the other axial side refers to the output side of the reverse input blocking clutch 1 (the left side in Figures 1 to 4).

[0037] <Explanation of the structure of the reverse input blocking clutch> The reverse input blocking clutch 1 of this disclosure comprises a pressed member 2, an input member 3, an output member 4, an engaging element 5, and a stopper member 6.

[0038] Of the elements constituting the reverse input blocking clutch 1, the pressed member 2, the input member 3, and the engaging element 5 have the same configuration and function as a conventional reverse input blocking clutch.

[0039] The pressed member 2 has a pressed surface 7 on its inner circumferential surface. The input member 3 has an input-side engaging portion 14 located radially inward of the pressed surface 7 and is arranged coaxially with the pressed surface 7. The output member 4 has an output-side engaging portion 19 located radially inward of the input-side engaging portion 14 and is arranged coaxially with the pressed surface 7. The engaging element 5 has a pressing surface 41 facing the pressed surface 7, an input-side engaged portion 42 that can engage with the input-side engaging portion 14, and an output-side engaged portion 43 that can engage with the output-side engaging portion 19, and is arranged to be movable in the radial direction.

[0040] When rotational torque is input to the input member 3, the engaging element 5 moves radially away from the pressed surface 7 based on the input-side engaging portion 14 engaging with the input-side engaged portion 42, and transmits the rotational torque input to the input member 3 to the output member 4 by engaging the output-side engaged portion 43 with the output-side engaging portion 19.

[0041] In response to this, when rotational torque is input in reverse to the output member 4, the engaging element 5, based on the fact that the output-side engaging portion 19 engages with the output-side engaged portion 43, presses its pressing surface 41 against the pressed surface 7, causing the pressing surface 41 to frictionally engage with the pressed surface 7. In other words, the reverse input blocking clutch 1 either completely blocks the rotational torque that is input in reverse to the output member 4 and does not transmit it to the input member 3, or transmits only a portion of it to the input member 3 and blocks the rest.

[0042] In this specification, the direction of the pressing surface 41 of the engaging element 5 relative to the pressed surface 7 is defined as the first direction (up and down direction in Figures 7 to 9), and the direction perpendicular to both the axial direction of the pressed surface 7 and the first direction is defined as the second direction (left and right direction in Figures 7 to 9). With respect to the engaging element 5, the direction coinciding with the first direction is defined as the radial direction of the engaging element 5 (direction indicated by arrow α in Figure 7), and the direction coinciding with the second direction is defined as the width direction of the engaging element 5 (direction indicated by arrow β in Figure 7).

[0043] The stopper member 6 is provided to restrict the axial movement of the engaging element 5 relative to the output member 4.

[0044] On the radially inner side of the pressed surface 7, an input-side engaging portion 14 of the input member 3 and an output-side engaging portion 19 of the output member 4 are arranged. In the first direction, on the radially inner side of the pressed surface 7, the input-side engaging portion 14, the input-side engaged portion 42, the output-side engaged portion 43, and the output-side engaging portion 19 are arranged in this order. Also, on the radially inner side of the pressed surface 7, the input-side engaging portion 14, the output-side engaging portion 19, and the engaging element 5 are rotatable.

[0045] In particular, in the reverse input blocking clutch 1 of the present disclosure, it is characterized in that by improving the configurations of the output member 4 and the stopper member 6, the detachment of the stopper member 6 from the output member 4 is prevented. Hereinafter, the components of the reverse input blocking clutch will be described centering on the configurations of the output member 4 and the stopper member 6.

[0046] 〔Pressed member〕The pressed member 2 has a pressed surface 7 on its inner peripheral surface. The pressed surface 7 constitutes a surface that contacts the pressing surface 41 of the engaging element 5 when the engaging element 5 moves in the radially outer direction, which is the direction in which the engaging element 5 approaches the pressed surface 7 in the first direction. That is, the pressed surface 7 has a function of frictionally engaging with the pressing surface 41 of the engaging element 5 when rotational torque is reversely input to the output member 4.

[0047] The pressed member 2 is supported by a fixed portion that does not rotate even when the reverse input blocking clutch 1 is in use, or is provided integrally with the fixed portion so that its rotation is restricted.

[0048] The shape of the pressed member 2 is not limited as long as its inner peripheral surface is configured to have the pressed surface 7. The pressed surface 7 is circular in shape when viewed axially, and although not limited to this, in this example, it is in the form of a cylindrical surface with no change in inner diameter in the axial direction.

[0049] In this example, the pressed member 2 includes a housing element 8. The housing element 8 is an element for incorporating the pressed member 2 into a mechanical element to which the reverse input blocking clutch 1 is applied.

[0050] The housing element 8 has a stepped cylindrical inner surface. Specifically, the inner surface of the housing element 8 is formed by connecting a large-diameter cylindrical surface portion 9 on one axial side and a small-diameter cylindrical surface portion 10 on the other axial side with a connecting surface portion 11 facing one axial side. In this example, the large-diameter cylindrical surface portion 9 constitutes the pressed surface 7.

[0051] The housing element 8 has an inwardly projecting flange portion 12 at one axial end of the small-diameter cylindrical surface portion 10, and has screw holes 13 opening at multiple locations in the circumferential direction on the other axial side surface.

[0052] The pressed member 2 may also include another housing element that closes the opening on one axial side of the housing element 8. In this case, the pressed member 2 is constructed by fitting the other housing element to the axial end of the housing element 8 without any play (spigot fitting), thereby positioning the housing element 8 and the other housing element radially, and then connecting the housing element 8 and the other housing element with a connecting member such as a bolt.

[0053] [Input Member] The input member 3 has an input-side engaging portion 14 located radially inward of the pressed surface 7 and is arranged coaxially with the pressed surface 7.

[0054] The input member 3 is connected to an input-side mechanism such as an electric motor on one axial side, and rotational torque is input to it. Specifically, the input member 3 can be made up of the output shaft of the input-side mechanism, or it can be made up as a separate member from the output shaft and fixed coaxially to the output shaft.

[0055] The input-side engaging portion 14 is provided on a part of the input member 3 that is radially outward from the rotational axis, and has a portion that engages, specifically contacts, with the input-side engaged portion 42 of the engaging element 5. The input-side engaging portion 14 is configured to engage (contact) its radially inner surface 16 with the radially inner surface 44 of the input-side engaged portion 42 as the input member 3 or engaging element 5 rotates.

[0056] In this example, the input member 3 has an input shaft portion 15 and an input flange portion 17, in addition to the input-side engaging portion 14.

[0057] The input shaft portion 15 is an element for connecting the input-side mechanism and the input member 3 to enable the transmission of rotational torque. In this example, the input shaft portion 15 has a cylindrical shape. The input member 3 is connected to the output shaft of the input-side mechanism, such as an electric motor, in a torque-transmitting manner by, for example, a non-circular engagement such as a spline engagement between the inner circumferential surface of the input shaft portion 15 and the outer circumferential surface of the output shaft of the input-side mechanism, or by press-fitting or the like.

[0058] The input flange portion 17 is an element for positioning the input-side engaging portion 14 at a location radially outward from the rotation center of the input member 3. In this example, the input flange portion 17 protrudes radially outward from the outer circumferential surface of the other axial end of the input shaft portion 15 over its entire circumference.

[0059] The input-side engaging portion 14 is an element that, when rotational torque is applied to the input member 3, engages with the input-side engaged portion 42 of the engaging element 5, causing the engaging element 5 to rotate in the same direction as the input torque. In this example, the input-side engaging portion 14 protrudes toward the other axial direction from a portion of the other axial side of the input flange portion 17 that is radially outward from the center of rotation.

[0060] The shape of the input-side engaging portion 14 is not limited, as long as it is configured to engage with the input-side engaged portion 42 of the engaging element 5.

[0061] For example, the input-side engaging portion 14 may have an end face shape that is symmetrical with respect to the circumferential direction, or it may have an end face shape that is asymmetrical with respect to the circumferential direction. In this example, the input-side engaging portion 14 has an end face shape that is symmetrical with respect to the circumferential direction.

[0062] For example, the input-side engaging portion 14 can have a partially annular shape, a substantially trapezoidal shape, or a similar end face shape, where the length in the second direction increases as it moves outward in the first direction when viewed from the axial direction. In this example, the input-side engaging portion 14 has an end face shape similar to a substantially trapezoidal shape, and the intermediate portion in the second direction of the radially inner surface 16 of the input-side engaging portion 14 is made up of a flat surface perpendicular to the line connecting the central axis O of the input member 3 and the center of the input-side engaging portion 14 when viewed from the axial direction, and the portions on both sides in the second direction are made up of partially cylindrical convex surfaces that are inclined in the direction toward the outward direction in the first direction as they move toward both sides in the second direction. The radially outer surface 18 of the input-side engaging portion 14 is made up of a partially cylindrical convex surface centered on the central axis O.

[0063] The number of input-side engaging portions 14 is determined according to the number of engaging elements 5. If the engaging element 5 is composed of multiple engaging elements 5, the input-side engaging portions 14 are also composed of multiple input-side engaging portions 14.

[0064] In this example, the engaging element 5 is composed of two engaging elements 5. Therefore, the input-side engaging portion 14 is composed of two input-side engaging portions 14, corresponding to the number of engaging elements 5. The two input-side engaging portions 14 are positioned at two radially opposite locations on the other axial side of the input flange portion 17, and are spaced apart from each other with respect to the radial direction of the input member 3.

[0065] The input member 3 can be rotatably supported by the pressed member 2 or the other housing element.

[0066] [Output Member] The output member 4 has an output-side engaging portion 19 that is located radially inward from the input-side engaging portion 14, and is arranged coaxially with the pressed surface 7. In other words, the output member 4 is also arranged coaxially with the input member 3.

[0067] The output member 4 is connected to an output mechanism, such as a reduction gear, on the other axial side, and is configured to output rotational torque to the output mechanism as it rotates. Specifically, the output member 4 can be formed from the input shaft of the output mechanism, or it can be formed as a separate member from the input shaft and fixed coaxially to the input shaft. In this example, the output member 4 is fixed coaxially to the drive pulley 38, which is the input shaft of the reduction gear 37. A toothed belt 71 is stretched between the drive pulley 38 and a driven pulley (not shown).

[0068] The output member 4 has an output-side engaging portion 19, as well as a mounting shaft portion 20 and an output shaft portion 21.

[0069] The output-side engaging portion 19, the mounting shaft portion 20, and the output shaft portion 21 are arranged in the order of mounting shaft portion 20, output-side engaging portion 19, and output shaft portion 21, starting from one side in the axial direction. In this example, the mounting shaft portion 20 and the output-side engaging portion 19, and the output-side engaging portion 19 and the output shaft portion 21 are directly connected in the axial direction.

[0070] The output-side engaging portion 19 has a portion that engages with the output-side engaged portion 43 of the engaging element 5, and is an element that receives rotational torque from the engaging element 5 when rotational torque is input to the input member 3 and the engaging element 5 rotates. Furthermore, when rotational torque is input in reverse to the output member 4, it engages with the output-side engaged portion 43 of the engaging element 5 and rotates the engaging element 5 in the same direction as the reverse input torque.

[0071] The portion of the output-side engaging portion 19 that engages with the output-side engaged portion 43 of the engaging element 5 is located radially inward from the input-side engaging portion 14 and radially outward from the rotational axis O of the output member 4, and is positioned to engage with the output-side engaged portion 43 of the engaging element 5. The output-side engaging portion 19 is configured to engage (contact) its outer circumferential surface with the output-side engaged portion 43 as the output member 4 or engaging element 5 rotates.

[0072] The output-side engaging portion 19 has a cam function. The distance from the rotational axis of the output member 4 to the outer circumferential surface of the output-side engaging portion 19, which is the part that engages with the output-side engaged portion 43, is not constant in the circumferential direction.

[0073] The number of parts of the output-side engaging portion 19 that engage with the output-side engaged portion 43 is determined according to the number of engaging elements 5. When the engaging element 5 is composed of multiple engaging elements 5, the output-side engaging portion 19 is also configured to have multiple engaging parts. In this example, the output-side engaging portion 19 is configured to have two parts that engage with the output-side engaged portion 43, corresponding to the number of engaging elements 5. However, even when the number of engaging elements 5 is three, it is possible to adopt a structure similar to that in this example.

[0074] When the output-side engaging portion 19 is cut by a virtual plane perpendicular to the rotational axis O of the output member 4, the cross-sectional shape of the output-side engaging portion 19 is arbitrary as long as the output-side engaging portion 19 has a cam function, and can be, for example, a square, rectangle, parallelogram, trapezoid, or other quadrilateral, oval, or a shape similar to these quadrilaterals or ovals.

[0075] In this example, the output-side engaging portion 19 has a substantially rectangular cross-sectional shape, as shown in Figure 7, when cut by a virtual plane perpendicular to the rotational axis O of the output member 4. More specifically, the outer circumferential surface of the output-side engaging portion 19 is composed of two parallel flat surfaces 22 and two convex curved surfaces 23, each partially cylindrical in shape.

[0076] In this example, the output-side engaging portion 19 is symmetrical with respect to a virtual plane that passes through the rotational axis O of the output member 4 and is perpendicular to the two flat surfaces 22. Furthermore, the output-side engaging portion 19 is symmetrical with respect to a virtual plane that passes through the rotational axis O of the output member 4 and is parallel to the two flat surfaces 22. That is, the output-side engaging portion 19 has a shape that is twice symmetrical with respect to the central axis of the output member 4. The output-side engaging portion 19 is located radially inside the two input-side engaging portions 14, positioned between the output-side engaged portions 43 of the two engaging elements 5, and passes through the through-hole 62 of the spacer 59.

[0077] The axial end face 24 of the output-side engaging portion 19 is formed by a flat surface perpendicular to the central axis of the output member 4. Furthermore, the axial end face 24 of the output-side engaging portion 19 is located to one axial side further than the axial end face 49 of the engaging element 5. Therefore, the output-side engaging portion 19 protrudes to one axial side further than the engaging element 5.

[0078] The mounting shaft portion 20 is the element to which the stopper member 6 is crimped and fixed.

[0079] The mounting shaft portion 20 protrudes in one axial direction from the end face 24 on one axial side of the output side engaging portion 19.

[0080] In this example, the mounting shaft portion 20 is provided at one end of the output member 4 on the axial side. However, the output member 4 may also have a shaft portion on one axial side of the mounting shaft portion 20, for example, inserted inside the input shaft portion 15 to increase the coaxiality between the output member 4 and the input member 3.

[0081] The mounting shaft portion 20 is not limited in shape, as long as it is configured to crimp and fix the stopper member 6. Specifically, the mounting shaft portion 20 can be any shape, such as a cylindrical shape, a truncated cone shape, an oval prism shape, an elliptical prism shape, a rectangular prism shape, or other prism shapes.

[0082] The shape of the mounting shaft portion 20 is preferably such that the diameter of the cylindrical portion 52 of the stopper member 6 fitted onto the mounting shaft portion 20 can be increased, in order to increase the contact area with the crimped portion 51 of the stopper member 6 and more effectively prevent the stopper member 6 from falling off. In this example, the end face 24 on one axial side of the output side engaging portion 19 has a substantially rectangular end face shape in which the dimension in the second direction is larger than the dimension in the first direction. For this reason, in order to increase the diameter of the cylindrical portion 52 of the stopper member 6 fitted onto the mounting shaft portion 20, it is preferable that the mounting shaft portion 20 be configured as a non-cylindrical shape having a cross-sectional shape in which the dimension in the second direction is larger than the dimension in the first direction.

[0083] Specifically, the mounting shaft portion 20 can have a cross-sectional shape in which the dimension in the second direction is larger than the dimension in the first direction, such as a polygonal shape like a rectangular prism, an oval prism, an elliptical prism, or a similar shape. In this case, it is more preferable that the cross-sectional shape of the mounting shaft portion 20 is the same as or similar to the end face 24 on one axial side of the output side engaging portion 19.

[0084] Furthermore, from the perspective of ensuring the rotational balance of the output member 4, the shape of the mounting shaft portion 20 is preferably rotationally symmetrical with respect to the central axis of the output member 4.

[0085] In this example, the mounting shaft portion 20 has a non-cylindrical shape. Specifically, the mounting shaft portion 20 has a roughly rectangular prism shape in which the dimension in the second direction is larger than the dimension in the first direction, and has a cross-sectional shape that approximates the shape of the end face 24 of the output side engaging portion 19, i.e., a roughly rectangular shape. More specifically, the mounting shaft portion 20 has a cross-sectional shape in which the dimension in the first direction is the same as the dimension of the end face 24 of the output side engaging portion 19 in the first direction, and the dimension in the second direction is shorter than the dimension of the end face 24 of the output side engaging portion 19 in the second direction. The outer circumferential surface of the mounting shaft portion 20 is composed of two flat surfaces 25 arranged parallel to each other and two convex curved surfaces 26, each of which is a partially cylindrical surface.

[0086] Furthermore, the mounting shaft portion 20 has a shape that is rotationally symmetric about the central axis of the output member 4, specifically a shape that is 2 rotationally symmetric. The mounting shaft portion 20 may also have a cross-sectional shape other than a substantially rectangular shape, such as an oval or elliptical shape, in which the dimension in the second direction is larger than the dimension in the first direction, and which approximates the shape of the end face 24 of the output side engaging portion 19.

[0087] The flat surface 25 of the mounting shaft portion 20 is located on the same plane as the flat surface 22 of the output side engaging portion 19.

[0088] The convex curved surface 26 of the mounting shaft portion 20 is located in a part where its circumferential phase coincides with that of the convex curved surface 23 of the output-side engaging portion 19. However, the convex curved surface 26 of the mounting shaft portion 20 is located radially inward from the convex curved surface 23 of the output-side engaging portion 19. The radius of curvature of the convex curved surface 26 of the mounting shaft portion 20 is smaller than the radius of curvature of the convex curved surface 23 of the output-side engaging portion 19. The axial end of the convex curved surface 23 of the output-side engaging portion 19 and the axial end of the convex curved surface 26 of the mounting shaft portion 20 are connected by the axial end face 24 of the output-side engaging portion 19. The diameter of the circumscribed circle of the mounting shaft portion 20 is the same as, or slightly smaller than, the inner diameter of the cylindrical portion 52 of the stopper member 6. The circumscribed circle of the mounting shaft portion 20 refers to a virtual circle that passes through the two convex curved surfaces 26 of the mounting shaft portion 20, with the central axis of the output member 4 as its center.

[0089] In this example, the mounting shaft portion 20 has a non-cylindrical shape and a cross-sectional shape similar to that of the output-side engaging portion 19. This allows the diameter of the cylindrical portion 52 fitted onto the mounting shaft portion 20 to be increased, thereby increasing the contact area between the outer circumferential surface of the mounting shaft portion 20 and the crimping portion 51. Consequently, the detachment of the stopper member 6 can be prevented more effectively.

[0090] Even if the mounting shaft portion 20 does not have an engagement surface 27 on its outer circumferential surface facing the other axial direction, the crimping portion 51 strongly presses against the outer circumferential surface of the mounting shaft portion 20, preventing the stopper member 6 from moving to one axial side. To more effectively prevent the stopper member 6 from falling off, it is preferable that the mounting shaft portion 20 has an engagement surface 27 on at least a part of its outer circumferential surface that engages with the crimping portion 51 of the stopper member 6 in the axial direction and faces the other axial side. This ensures that the stopper member 6 is reliably prevented from moving to one axial side.

[0091] The engaging surface 27 can be any surface as long as it can engage with the crimped portion 51 of the stopper member 6 in the axial direction, and can be, for example, the inner surface 29 of the recess 28, a stepped surface, or the side surface of a protrusion. The engaging surface 27 can be a flat surface or a curved surface. When the engaging surface 27 is a flat surface, it can be a surface perpendicular to the central axis of the output member 4, or a surface inclined with respect to the perpendicular surface. When the engaging surface 27 is a surface inclined with respect to the perpendicular surface, it is preferable that the inclination angle with respect to the perpendicular surface is small from the perspective of effectively preventing the stopper member 6 from falling off.

[0092] The number and position of the engagement surfaces 27 provided on the outer circumferential surface of the mounting shaft portion 20 are arbitrary. If multiple engagement surfaces 27 are provided, they may be spaced apart in the circumferential direction or spaced apart in the axial direction.

[0093] If the engaging surface 27 is formed by the inner surface 29 of the recess 28, the recess 28 is provided at one or more locations on the outer circumferential surface of the mounting shaft portion 20. If the recess 28 is provided at one location on the outer circumferential surface of the mounting shaft portion 20, it can be provided over the entire circumferential direction of the outer circumferential surface of the mounting shaft portion 20, or it can be provided in a part of the circumferential direction. If the recess 28 is provided at multiple locations on the outer circumferential surface of the mounting shaft portion 20, it can be provided at multiple locations in the circumferential direction at one axial location on the outer circumferential surface of the mounting shaft portion 20, or it can be provided at a part of the circumferential direction at multiple axial locations on the outer circumferential surface of the mounting shaft portion 20.

[0094] For example, if the mounting shaft portion 20 has two flat surfaces 25 and two convex curved surfaces 26, the recess 28 can be provided on either the flat surfaces 25 or the convex curved surfaces 26. If the recess 28 is provided at multiple locations on the outer circumferential surface of the mounting shaft portion 20, the recess 28 can be provided on either the two convex curved surfaces 26 or the two flat surfaces 25. Alternatively, the recess 28 can be provided on both the flat surfaces 25 and the convex curved surfaces 26. The recess 28 is provided by dividing the convex curved surface 26 in the circumferential direction.

[0095] The shape of the recess 28 can be, for example, a groove shape, a hole shape, etc. If the recess 28 is configured as a groove shape, it can extend in the circumferential direction or in the axial direction. The inner surface 29 of the recess 28 can have any cross-sectional shape, as long as at least a part of it forms an engagement surface 27, and can be configured as a roughly L-shape, roughly V-shape, roughly U-shape, roughly C-shape, etc.

[0096] The mounting shaft portion 20 may also be provided with another engagement surface that can engage with the crimping portion 51 of the stopper member 6 in the circumferential direction, either in place of or simultaneously with the engagement surface 27.

[0097] In this example, the engaging surface 27 is formed by the inner surface 29 facing the other axial direction of a recess 28 formed on the outer circumferential surface of the mounting shaft portion 20. The recess 28 is provided at two locations on the outer circumferential surface of the mounting shaft portion 20 that are opposite each other in the diametrical direction. Specifically, the recess 28 is provided on two convex curved surfaces 26 located on the outer circumferential surface of the mounting shaft portion 20 that are opposite each other in the diametrical direction.

[0098] The recess 28 is provided on a portion of the convex curved surface 26 in the axial direction. Specifically, the recess 28 is provided on the middle portion of the convex curved surface 26 in the axial direction.

[0099] The recess 28 has a groove shape that extends in the circumferential direction and is provided along the entire circumferential direction of the axial intermediate portion of the convex curved surface 26.

[0100] In this example, the inner surface 29 of the recess 28 has a roughly L-shaped cross-section. Specifically, the inner surface 29 of the recess 28 is composed of a first inclined surface 30 and a second inclined surface 31, which have different inclination angles with respect to the central axis of the output member 4.

[0101] The first inclined surface 30 is positioned in a range extending from the other axial end of the inner surface 29 to the axial middle portion, and is gently inclined radially inward as it approaches one axial side. The inclination angle of the first inclined surface 30 with respect to the central axis of the output member 4 is not limited to this, but is approximately 15 degrees to 45 degrees, and is about 30 degrees in the illustrated example.

[0102] The second inclined surface 31 is positioned at one end of the inner surface 29 on the axial side, and inclins more and more radially outward towards the axial side. The inclination angle of the second inclined surface 31 with respect to the central axis of the output member 4 is not limited to this, but is approximately 55 degrees or more and 85 degrees or less, and in the illustrated example it is approximately 70 degrees. In this example, the position of the axial opening edge of the recess 28 is devised so that the radially inward edge (see point A in Figure 4) of the axial end of the partial cylindrical portion 67 that becomes the crimped portion 51 does not catch on the axial opening edge (see point B in Figure 4) of the recess 28 during the process of forming the crimped portion 51 of the stopper member 6.

[0103] In this example, the second inclined surface 31 of the inner surface 29 constitutes the engagement surface 27. The second inclined surface 31 that constitutes the engagement surface 27 engages with the crimping portion 51 in the axial direction, reliably preventing the stopper member 6 from moving to one side in the axial direction, and effectively preventing the stopper member 6 from falling off.

[0104] Furthermore, since the engaging surface 27 is formed by the inner surface 29 of the recess 28 provided on the outer circumferential surface of the mounting shaft portion 20, the engaging surface 27 can be easily machined, and machining costs can be reduced.

[0105] The output shaft portion 21 is an element for connecting the output member 4 and the input portion of the output mechanism so as to be able to transmit rotational torque.

[0106] The output shaft portion 21 is arranged coaxially with the output-side engaging portion 19, and the output-side engaging portion 19 protrudes in the axial direction from the center of the end face 32 on one axial side of the output shaft portion 21. The end face 32 on one axial side of the output shaft portion 21 is made up of a flat surface perpendicular to the central axis of the output member 4.

[0107] In this example, the output shaft portion 21 has a stepped cylindrical shape. Specifically, the output shaft portion 21 has a large diameter portion 33, a medium diameter portion 34, and a small diameter portion 35 in order from one side in the axial direction. The large diameter portion 33 has a flange portion 36 that protrudes radially outward along its entire circumference in the axial middle portion of its outer circumferential surface. In this example, the drive pulley 38 of the reduction gear 37 is externally fitted and fixed to the medium diameter portion 34.

[0108] In this example, the large-diameter portion 33 of the output shaft 21 is rotatably supported relative to the pressed member 2. Specifically, the large-diameter portion 33 of the output shaft 21 is rotatably supported relative to the pressed member 2 by a radial rolling bearing 39a. The radial rolling bearing 39a is axially sandwiched between a flange portion 36 provided on the outer circumferential surface of the large-diameter portion 33 and an inward-facing flange portion 12 provided on the inner circumferential surface of the pressed member 2.

[0109] In this example, the output member 4 is provided with a corner radius 40 having a concave arc cross-sectional shape at the connection point between the axial end face 32 of the output shaft portion 21 and the outer circumferential surface of the output-side engaging portion 19. The corner radius 40 relieves the stress acting on the connection point between the axial end face 32 of the output shaft portion 21 and the outer circumferential surface of the output-side engaging portion 19.

[0110] [Engaging element] The engaging element 5 has a pressing surface 41 facing the pressed surface 7, an input-side engaged portion 42 that can engage with the input-side engaging portion 14, and an output-side engaged portion 43 that can engage with the output-side engaging portion 19, and is arranged to be movable in a first direction which is the near-far direction relative to the pressed surface 7.

[0111] When rotational torque is input to the input member 3, the engaging element 5 moves away from the pressed surface 7 in the first direction, based on the input-side engaging portion 14 engaging with the input-side engaged portion 42, and transmits the rotational torque input to the input member 3 to the output member 4 by engaging the output-side engaged portion 43 with the output-side engaging portion 19. Conversely, when rotational torque is input in reverse to the output member 4, the engaging element 5 presses the pressing surface 41 against the pressed surface 7, based on the output-side engaging portion 19 engaging with the output-side engaged portion 43, thereby frictionally engaging the pressing surface 41 with the pressed surface 7.

[0112] The engaging element 5 can be composed of two engaging elements 5, or of three or more engaging elements 5, as long as it has the above configuration.

[0113] The engaging element 5 can be manufactured by any method. For example, the engaging element 5 can be manufactured by pressing, sintering, forging, casting, and / or machining. In this example, the engaging element 5 is a press-formed metal plate manufactured by pressing.

[0114] The shape of the engaging element 5 is arbitrary as long as it comprises a pressing surface 41, an input-side engaged portion 42, and an output-side engaged portion 43, and can achieve the above-mentioned functions, and a wide range of conventional engaging element shapes can be adopted.

[0115] In this example, the engaging element 5 is composed of two engaging elements 5. Each engaging element 5 has the function of an engaging element 5. Each engaging element 5 has a substantially semicircular end face shape when viewed from the axial direction and has a symmetrical shape with respect to the width direction. The configuration of each engaging element 5 will be described below.

[0116] The pressing surface 41 is provided on the radially outer surface of the engaging element 5 facing the pressed surface 7. The shape and size of the pressing surface 41 are arbitrary as long as they can frictionally engage with the pressed surface 7. The pressing surface 41 can be made up of the entire radially outer surface of the engaging element 5, or it can be made up of a part of it. One pressing surface 41 can be provided for one engaging element 5, or multiple pressing surfaces 41 can be provided. The radius of curvature of the pressing surface 41 can be the same as the radius of curvature of the pressed surface 7, or it can be smaller than the radius of curvature of the pressed surface 7.

[0117] In this example, the pressing surface 41 is composed of two pressing surfaces 41 located at two positions on the radially outer surface of the engaging element 5 that are spaced apart from each other in the circumferential direction. Each pressing surface 41 is composed of a partially cylindrical convex curved surface having a radius of curvature smaller than the radius of curvature of the surface to be pressed 7.

[0118] The portion of the radially outer surface of the engaging element 5 that is circumferentially away from the two pressing surfaces 41 is located radially inward from the circumscribed circle that is centered on the rotation center O of the input member 3 and in contact with the two pressing surfaces 41, when viewed from the axial direction. In other words, when the two pressing surfaces 41 are in contact with the surface to be pressed 7, the portion that is circumferentially away from the two pressing surfaces 41 does not come into contact with the surface to be pressed 7.

[0119] The pressing surface 41 preferably has a surface property that results in a higher coefficient of friction with respect to the pressed surface 7 than the other parts of the engaging element 5. Furthermore, the pressing surface 41 can be integrally formed with the other parts of the engaging element 5, or it can be formed from the surface of a friction material fixed to the other parts of the engaging element 5 by adhesive or other means.

[0120] The input-side engaged portion 42 engages with the input-side engaged portion 14 as the input member 3 rotates, and is an element that receives the rotational torque input from the input member 3. The shape of the input-side engaged portion 42 is not limited as long as it is configured to be able to engage with the input-side engaged portion 14.

[0121] In this example, the input-side engaged portion 42 is provided in the radially intermediate portion of the widthwise center of the engaging element 5. More specifically, the input-side engaged portion 42 is composed of a through hole that penetrates the radially intermediate portion of the widthwise center of the engaging element 5 in the axial direction.

[0122] The input-side engaged portion 42 is sized to allow the input-side engaged portion 14 to be loosely inserted. Therefore, when the input-side engaged portion 14 is inserted inside the input-side engaged portion 42, there are gaps between the input-side engaged portion 14 and the inner surface of the input-side engaged portion 42 in the width direction and the radial direction of the engaging element 5. As a result, the input-side engaged portion 14 can be displaced relative to the input-side engaged portion 42 in the rotational direction of the input member 3, and the input-side engaged portion 42 can be displaced radially relative to the input-side engaged portion 14.

[0123] In this example, the radially inner surface 44 of the inner surface of the input-side engaged portion 42, which faces radially outward, is composed of a flat surface perpendicular to the first direction, and the radially outer surface 45 of the inner surface of the input-side engaged portion 42, which faces radially inward, is composed of a curved surface having a substantially arc-shaped contour or a composite surface having a substantially V-shaped contour when viewed from the axial direction. The circumferential surface 46 connecting the ends on both sides of the radially inner surface 44 in the second direction and the ends on both sides of the radially outer surface 45 in the second direction is composed of a partially cylindrical concave curved surface.

[0124] The output-side engaged portion 43 engages with the output-side engaged portion 19 as the engaging element 5 rotates, and is an element for outputting the rotational torque input from the input member 3 to the engaging element 5 to the output member 4. The shape of the output-side engaged portion 43 is not limited as long as it is configured to engage with the output-side engaged portion 19. In this example, the output-side engaged portion 43 is provided at the center in the width direction of the radially inner surface of the engaging element 5.

[0125] In this example, the engaging element 5 has a flat surface portion 47 on its radially inner surface that is perpendicular to the radial direction of the engaging element 5, and has two protrusions 48 projecting radially inward at two positions on the flat surface portion 47 in the width direction of the engaging element 5. The output-side engaged portion 43 is composed of the portion of the flat surface portion 47 that is located between the two protrusions 48 in the width direction. In this example, the width dimension of the output-side engaged portion 43, i.e., the distance between the two protrusions 48, is larger than the width dimension of the flat surface 22 of the output-side engaging portion 19.

[0126] In the reverse input blocking clutch 1 of this example, the pressing surfaces 41 of the two engaging elements 5 are oriented radially toward opposite sides of each other, and the flat surfaces 47 are facing each other, with each engaging element 5 positioned radially inward of the housing element 8, allowing movement in the first direction. Furthermore, the two input-side engaging portions 14 of the input member 3, positioned on one axial side, are inserted axially into the respective input-side engaged portions 42 of the two engaging elements 5, and the output-side engaging portion 19 of the output member 4, positioned on the other axial side, is inserted axially between the output-side engaged portions 43 of the two engaging elements 5. In other words, the two engaging elements 5 are positioned so that their respective output-side engaged portions 43 sandwich the output-side engaging portion 19 from the radial outside.

[0127] With the two engaging elements 5 positioned radially inward of the pressed member 2, the inner diameter of the pressed surface 7 and the radial dimensions of the engaging elements 5 are regulated such that a gap exists in at least one of the following areas: the space between the pressed surface 7 and the two pressing surfaces 41, and the space between the tip faces of the two combinations of protrusions 48 formed by the two protrusions 48 of the two engaging elements facing each other.

[0128] In this example, the engaging element 5 has a constant axial dimension along the radial direction. The end face 49 on one axial side and the end face 50 on the other axial side of the engaging element 5 are arranged parallel to each other and are each configured as flat surfaces.

[0129] [Stopper Member] The stopper member 6 restricts the axial movement of the engaging element 5 relative to the output member 4. Specifically, the stopper member 6 ensures that the axial position of the engaging element 5 is correct and prevents the engaging element 5 from moving axially to one side relative to the output member 4.

[0130] The stopper member 6 has a cylindrical portion 52 fitted onto the mounting shaft portion 20, a flange portion 53 connected to the other axial side of the cylindrical portion 52 and facing the axial end face 49 of the engaging element 5 in the axial direction, and a crimping portion 51 formed on at least a part of the cylindrical portion 52 or connected to at least a part of the circumferential direction of the end of the cylindrical portion 52 on one axial side, and is crimped and fixed to the mounting shaft portion 20.

[0131] Since a crimped portion 51 is formed on a part of the stopper member 6, it is made of metal, preferably a metal with excellent workability such as mild steel. The stopper member 6 is manufactured, for example, by press working on a material such as SPHC (hot-rolled steel sheet).

[0132] The stopper member 6 may be configured to be unable to rotate relative to the mounting shaft 20, or it may be configured to be able to rotate relative to the mounting shaft 20. To prevent the stopper member 6 from rotating relative to the mounting shaft 20, for example, the crimping portion 51, the cylindrical portion 52, and / or the flange portion 53 can be used to prevent the stopper member 6 from rotating relative to the mounting shaft 20.

[0133] In this example, the stopper member 6 is prevented from rotating relative to the mounting shaft 20 by utilizing the flange portion 53.

[0134] It is preferable that the stopper member 6 is positioned axially with respect to the output member 4 such that a gap is secured between the end face 49 on one axial side of the engaging element 5 and the side surface 56 on the other axial side of the flange portion 53.

[0135] In this example, the stopper member 6 is positioned axially relative to the output member 4 by abutting a portion of it against the end face 24 on one axial side of the output-side engaging portion 19. Specifically, the stopper member 6 is positioned axially relative to the output member 4 by abutting the radially inner portion of the other axial side surface 56 of the flange portion 53 against the end face 24 on one axial side of the output-side engaging portion 19. As a result, an axial gap is provided between the end face 49 on one axial side of the engaging element 5 and the other axial side surface 56 of the flange portion 53.

[0136] In this example, the stopper member 6 is positioned axially relative to the output member 4 by abutting it against the end face 24 on one axial side of the output-side engaging portion 19, thereby allowing for precise control of the axial position of the stopper member 6. This allows for precise control of the axial position of the engaging element 5. Furthermore, an axial gap can be provided between the end face 49 on one axial side of the engaging element 5 and the side surface 56 on the other axial side of the flange portion 53, preventing the flange portion 53 from becoming a resistance when the engaging element 5 moves radially.

[0137] The shape of the cylindrical portion 52 is not limited as long as it is configured to fit onto the mounting shaft portion 20. The cylindrical portion 52 can be any shape, such as cylindrical, elliptical, oblong, truncated cone, or rectangular.

[0138] The shape of the inner circumferential surface of the cylindrical portion 52 is preferably such that it can be fitted onto the mounting shaft portion 20 without any rattle in the radial direction.

[0139] The shape of the inner circumferential surface of the cylindrical portion 52 may match the shape of the outer circumferential surface of the mounting shaft portion 20, but it does not have to match the shape of the outer circumferential surface of the mounting shaft portion 20 as long as the cylindrical portion 52 can be fitted onto the mounting shaft portion 20 without any rattle in the radial direction.

[0140] In this example, the cylindrical portion 52 is constructed in a cylindrical shape overall, and its inner circumferential surface is cylindrical. Therefore, the shape of the inner circumferential surface of the cylindrical portion 52 does not match the shape of the outer circumferential surface of the mounting shaft portion 20.

[0141] The inner diameter of the cylindrical portion 52 is the same as, or slightly larger than, the diameter of the circumscribed circle of the mounting shaft portion 20. Therefore, the cylindrical portion 52 is prevented from rattling radially relative to the mounting shaft portion 20 by two circumferential positions on its inner surface that are radially opposite to the convex curved surface 26. A gap that is approximately arc-shaped or approximately annular when viewed from the axial direction is formed between the inner surface of the cylindrical portion 52 and the flat surface 25 of the mounting shaft portion 20.

[0142] The axial dimension of the cylindrical portion 52 is slightly smaller than the axial dimension of the mounting shaft portion 20.

[0143] The crimping portion 51 is an element for crimping and fixing the stopper member 6 to the mounting shaft portion 20.

[0144] The crimped portion 51 refers to a part that has been plastically deformed using a jig or tool, and its shape is not limited as long as it is configured to crimp and fix the stopper member 6 to the mounting shaft portion 20. The crimped portion 51 can be any shape, such as a protruding piece, annular shape, or projection shape.

[0145] The crimped portion 51 is formed by applying a crimping process to a part of the cylindrical portion 52, a portion extending from a part in the circumferential direction of one axial end of the cylindrical portion 52, or the axial end of the cylindrical portion 52 itself, before the crimping process.

[0146] The shape of the crimping portion 51 is preferably configured as a projection, from the perspective of keeping the press load required for crimping low. When the crimping portion 51 is configured as a projection extending in the axial direction, the crimping portion 51 can be obtained, for example, by applying crimping to a claw portion 55 that extends in the axial direction from a part of the circumferential direction of one end of the cylindrical portion before crimping. When the crimping portion 51 is configured as a projection extending in the circumferential direction, the crimping portion 51 can be obtained, for example, by applying crimping to a part that extends in the circumferential direction formed by creating a substantially U-shaped slit in the axial middle of the cylindrical portion before crimping, or to a part that extends in the circumferential direction from a part of the circumferential direction of one end of the cylindrical portion before crimping.

[0147] The shape of the crimped portion 51 is preferably annular in the circumferential direction, so as to prevent the engagement with the engaging surfaces 27, which are spaced apart in the circumferential direction, from being disengaged even when the stopper member 6 rotates relative to the mounting shaft portion 20. In this case, the crimped portion 51 is obtained, for example, by crimping the axial end of the cylindrical portion 52 itself in its pre-crimping state. Alternatively, the crimped portion 51 is obtained, for example, by crimping the axial middle portion of the cylindrical portion 52 itself in its pre-crimping state.

[0148] If the crimped portion 51 is configured as a projection, the crimped portion 51 can be obtained, for example, by applying a crimping process to a part of the cylindrical portion 52 in the axial direction and a part in the circumferential direction, using the tip of a tool such as a pin, while the portion is still in the pre-crimping state.

[0149] The number of crimping portions 51 is arbitrary. The stopper member 6 may have only one crimping portion 51 or may have multiple crimping portions 51. If the stopper member 6 has multiple crimping portions 51, the multiple crimping portions 51 may be spaced apart in the circumferential direction or spaced apart in the axial direction.

[0150] The position of the crimping portion 51 within the cylindrical portion 52 is arbitrary. The crimping portion 51 may be provided so as to be connected to one end of the cylindrical portion 52 on the axial side, or it may be provided on at least a part of the cylindrical portion 52, for example, in the axial middle part of the cylindrical portion 52, or on other parts.

[0151] Even when the outer circumferential surface of the mounting shaft portion 20 is not provided with an engaging surface 27, the crimping portion 51 can prevent the stopper member 6 from moving in one axial direction by strongly pressing the outer circumferential surface of the mounting shaft portion 20 radially inward.

[0152] In this example, the crimping portion 51 is configured as a projection extending axially from one end of the cylindrical portion 52 on the axial side. Furthermore, the crimping portion 51 is provided at two locations opposite the diametrically opposite end of the cylindrical portion 52 on the axial side. Therefore, the stopper member 6 has two crimping portions 51.

[0153] This configuration allows for a reduced press load required for crimping, thereby lowering processing costs. Furthermore, since the two crimped sections 51 can be processed simultaneously, the number of processing steps is reduced, further contributing to cost savings.

[0154] The crimping portion 51 is preferably axially engaged with an engagement surface 27 provided on the outer circumferential surface of the mounting shaft portion 20 in order to effectively prevent the stopper member 6 from falling off. The crimping portion 51 can also be circumferentially engaged with another engagement surface provided on the outer circumferential surface of the mounting shaft portion 20 in order to prevent relative rotation of the stopper member 6 with respect to the mounting shaft portion 20.

[0155] In this example, the crimped portion 51 undergoes plastic deformation such that it bends radially inward as it moves toward one side in the axial direction, and it fits inside the recess 28 provided on the convex curved surface 26 of the outer circumferential surface of the mounting shaft portion 20.

[0156] Each crimped portion 51 has its radially inner surface pressed against the first inclined surface 30 of the inner surface 29 of the recess 28, and its axially oriented edge is axially engaged with the second inclined surface 31 of the inner surface 29 of the recess 28, which constitutes the engagement surface 27.

[0157] As shown in Figure 10, the crimping portion 51 is formed by plastically deforming a partially cylindrical claw portion 55, which is connected to one end of the cylindrical portion 52 on the axial side, radially inward after the cylindrical portion 52 has been fitted onto the mounting shaft portion 20. Specifically, the crimping portion 51 is formed by pressing a jig (not shown) axially around the claw portion 55 and bending the claw portion 55 radially inward.

[0158] In this example, the crimped portion 51 engages axially with the engaging surface 27 provided on the outer circumferential surface of the mounting shaft portion 20, thereby more effectively preventing the stopper member 6 from falling off the mounting shaft portion 20.

[0159] The flange portion 53 faces the end face 49 on one axial side of the engaging element 5 in the axial direction and is an element that prevents the engaging element 5 from moving to one axial side.

[0160] In this example, the flange portion 53 protrudes radially outward from the other axial end of the cylindrical portion 52. The other axial side surface 56 of the flange portion 53 is configured as a flat surface perpendicular to the central axis of the stopper member 6, and is axially opposite to the portion of the end face 49 on one axial side of the engaging element 5 that is radially inward from the opening of the through hole constituting the input-side engaged portion 42.

[0161] The shape of the flange portion 53 is not limited, as long as it is configured to prevent the engaging element 5 from moving in one axial direction. The flange portion 53 can be any shape, such as a hollow plate or a projection.

[0162] When the flange portion 53 is configured as a hollow plate, the outer peripheral edge portion 54 of the flange portion 53 can be configured as circular or as non-circular. When the flange portion 53 is configured as a hollow disc and has a non-circular outer peripheral edge portion 54, the flange portion 53 can engage with the input-side engaging portion 14 in the circumferential direction to prevent relative rotation of the stopper member 6 with respect to the mounting shaft portion 20.

[0163] The shape of the flange portion 53 is preferably such that it can increase the area facing the end face 49 on one axial side of the engaging element 5 in order to effectively prevent the engaging element 5 from moving in one axial direction.

[0164] In this example, the flange portion 53 is constructed in a hollow plate shape and has a non-circular outer peripheral edge portion 54 when viewed from the axial direction. The outer peripheral edge portion 54 of the flange portion 53 has an oval contour shape in which the dimension in the second direction is larger than the dimension in the first direction. Specifically, the outer peripheral edge portion 54 of the flange portion 53 is composed of two straight portions 57 that extend in the second direction and are arranged parallel to each other, and two arc portions 58 that connect the ends of the two straight portions 57.

[0165] In this example, the distance between the two straight sections 57 is set to be shorter than the distance between the two radially inner surfaces 44 when the two engaging elements 5 are moved in the direction that brings them closest to each other, and longer than the distance between the two flat surfaces 47 when the two engaging elements 5 are moved in the direction that maximizes the distance between their respective flat surfaces 47. Therefore, the flange section 53 does not interfere with the engagement between the input-side engaging section 14 and the input-side engaged section 42.

[0166] Furthermore, when the stopper member 6 attempts to rotate relative to the mounting shaft portion 20, two straight sections 57 of the outer peripheral edge portion 54 of the flange portion 53 engage with the input-side engaging portion 14 in the circumferential direction. This shape of the flange portion 53 prevents the stopper member 6 from rotating relative to the mounting shaft portion 20.

[0167] Therefore, it is possible to prevent the crimped portion 51 from coming off the convex curved surface 26 on the outer circumferential surface of the mounting shaft portion 20 in the circumferential direction. Consequently, it is possible to prevent the engagement between the crimped portion 51 and the engagement surface 27 from becoming disengaged, and thus prevent the stopper member 6 from falling off.

[0168] In this example, the outer peripheral edge 54 of the flange portion 53 has an oval contour shape in which the dimension in the second direction is larger than the dimension in the first direction, so that a large area is secured for the portion that faces the axial end face 49 on one axial side of the engaging element 5 in the axial direction.

[0169] In the reverse input blocking clutch 1 of this disclosure, the stopper member 6 has both the functions of a retaining ring and a spacer positioned adjacent to the retaining ring in a conventional reverse input blocking clutch. That is, since the stopper member 6 has a flange portion 53 that faces the axial end face 49 on one axial side of the engaging element 5 in the axial direction, the stopper member 6 can directly restrict the movement of the engaging element 5 in one axial direction. Therefore, a dedicated spacer to restrict the movement of the engaging element 5 in one axial direction becomes unnecessary. As a result, the reverse input blocking clutch 1 of this disclosure achieves a reduction in the number of parts.

[0170] In the reverse input blocking clutch 1 of this disclosure, the cylindrical portion 52 of the stopper member 6 is fitted onto the mounting shaft portion 20 of the output member 4, and the stopper member 6 is crimped and fixed to the mounting shaft portion 20 by the crimping portion 51. Therefore, the detachment of the stopper member 6 is sufficiently prevented. Accordingly, when transporting the assembly, which is a sub-assembly of the output member 4, the engaging element 5, the spacer 59, and the stopper member 6, it is possible to prevent the assembly from being disassembled by the stopper member 6 detaching from the output member 4. This also improves the workability of the assembly work of the reverse input blocking clutch 1. Furthermore, since the stopper member 6 is crimped and fixed to the mounting shaft portion 20 by the crimping portion 51 and is firmly fixed to the mounting shaft portion 20, a larger size can be used compared to conventional stopper members consisting of retaining rings.

[0171] In particular, in a structure in which an engaging surface 27 is provided on the outer circumferential surface of the mounting shaft portion 20, the crimping portion 51 engages with the engaging surface 27 in the axial direction, thereby more effectively preventing the stopper member 6 from falling off the mounting shaft portion 20.

[0172] [Spacer] The reverse input blocking clutch 1 in this example has a spacer 59 as an optional component, which is positioned between the axial end face 32 of the output shaft portion 21 and the axial end face 50 of the engaging element 5.

[0173] The spacer 59 is an element that restricts the movement of the engaging element 5 to the other axial side and aligns the axial position of the pressing surface 41 of the engaging element 5 with the axial position of the pressing surface 7 of the pressed member 2.

[0174] The spacer 59 is positioned between the axial end face 32 of the output shaft portion 21 and the axial end face 50 of the engaging element 5, and its shape, size, and material are not limited, as long as it is configured to align the axial position of the pressing surface 41 of the engaging element 5 with the axial position of the pressed surface 7 of the pressed member 2.

[0175] In this example, the spacer 59 is positioned around the output-side engaging portion 19 and between the axial end face 32 of the output shaft portion 21 and the axial end faces 50 of each of the two engaging elements 5.

[0176] The spacer 59 has an end face 32 on one axial side of the output shaft portion 21 and an end face 60 on the other axial side that is opposite to it in the axial direction, and an end face 50 on the other axial side of the engaging element 5 and an end face 61 on one axial side that is opposite to it in the axial direction.

[0177] The spacer 59 can be made of synthetic resin, rubber, metal, or the like.

[0178] In this example, the spacer 59 is constructed in a flat plate shape and has an end face shape that is approximately rectangular or approximately oval when viewed from the axial direction. In this example, the end face 60 on the other axial side and the end face 61 on the one axial side of the spacer 59 are arranged parallel to each other and are each constructed as a flat surface.

[0179] In this example, the spacer 59 has a through hole 62 through which the output-side engaging portion 19 is inserted. The through hole 62 penetrates the central part of the spacer 59 in the axial direction, has a roughly rectangular or oval opening shape when viewed from the axial direction, and is sized to allow the output-side engaging portion 19 to be inserted without rattling.

[0180] In this example, the spacer 59 has a chamfered portion 63 on the opening edge on the other axial side of the through hole 62. The chamfered portion 63 is composed of a C-shaped chamfered portion having a linear cross-sectional shape. The chamfering depth of the chamfered portion 63 is set to a size that prevents interference between the chamfered portion 63 and the corner radius portion 40 of the output member 4.

[0181] [Biasing Member] The reverse input blocking clutch 1 in this example further comprises a biasing member 64 as an optional component.

[0182] The biasing member 64 elastically biases the engaging element 5 toward the pressed surface 7. The biasing member 64 can be made of a spring such as a leaf spring, coil spring, or disc spring, or an elastic material such as rubber, elastomer, or synthetic resin. The number of biasing members 64 is not particularly limited and is appropriately determined according to the number of engaging elements 5.

[0183] In this example, the biasing member 64 is composed of two biasing members 64 positioned at two locations in the width direction between the radially inner surfaces of the two engaging elements 5, and each biasing member 64 is composed of a compression coil spring. A protrusion 48 is inserted into the inside of both ends in the extension direction of each biasing member 64. This prevents each biasing member 64 from falling out of the space between the two engaging elements 5.

[0184] The two biasing members 64 elastically bias the two engaging elements 5 toward the pressed surface 7 by the force that attempts to restore their elasticity. As a result, in the neutral state where no torque is applied to either the input member 3 or the output member 4, the pressing surfaces 41 of the two engaging elements 5 come into contact with the pressed surface 7.

[0185] [Support Member] The reverse input blocking clutch 1 in this example further comprises a support member 65 as an optional component.

[0186] The support member 65 is an element for rotatably supporting the other axial end (small diameter portion 35) of the output shaft portion 21.

[0187] The support member 65 comprises a cylindrical bearing holder 66, a partial cylindrical portion 67 extending axially from a single circumferential position at one end of the bearing holder 66 on one axial side, and an outward flange portion 68 extending radially outward from one end of the partial cylindrical portion 67 on one axial side.

[0188] The support member 65 is supported and fixed to the housing element 8 by screwing a bolt 70, which is inserted through a through hole 69 provided in the outward flange portion 68, into a threaded hole 13 provided in the housing element 8.

[0189] The other axial end (small diameter portion 35) of the output shaft portion 21 is rotatably supported by the support member 65 via a radial rolling bearing 39b held by the bearing holding portion 66.

[0190] In the illustrated example, the radial rolling bearings 39a and 39b that rotatably support the output shaft 21 are each ball bearings using balls as rolling elements. However, the radial rolling bearings for supporting the output shaft 21 can also be constructed using tapered roller bearings or cylindrical roller bearings using tapered rollers as rolling elements. Furthermore, different types of bearings can be used for the radial rolling bearings 39a and 39b.

[0191] <Explanation of the operation of the reverse input blocking clutch> The operation of the reverse input blocking clutch 1 in this example will be explained using Figures 8 and 9. Note that Figures 8 and 9 omit the biasing member 64 and the stopper member 6, and exaggerate the radial gap between the input member 3 and the output member 4 and the two engaging elements 5.

[0192] When rotational torque is applied to the input member 3, the two engaging elements 5 move away from the pressed surface 7, regardless of the rotation direction of the input member 3. More specifically, as shown in Figure 8, the input-side engaging portion 14 rotates inside the input-side engaged portion 42 in the rotation direction of the input member 3 (counterclockwise in the example of Figure 8).

[0193] This reduces the gap between the radially inner surface 16 of the input-side engaging portion 14 and the radially inner surface 44 of the input-side engaged portion 42, causing the radially inner surface 16 of the input-side engaging portion 14 to come into contact with the radially inner surface 44 of the input-side engaged portion 42.

[0194] From this state, as the input member 3 rotates further, the radially inner surface 16 of the input-side engaging portion 14 presses the radially inner surface 44 of the input-side engaged portion 42 radially inward, causing the engaging element 5 to move away from the pressed surface 7. That is, the two engaging elements 5 move radially inward, moving closer to each other based on their engagement with the input member 3, causing the radially inner surfaces of the two engaging elements 5 to approach each other, and the output-side engaged portion 19 of the output member 4 to be clamped from both radial sides by the output-side engaged portions 43 of the two engaging elements 5.

[0195] In this way, the output member 4 is rotated so that the flat surface 22 of the output-side engaging portion 19 is parallel to the output-side engaged portion 43, and the output-side engaging portion 19 and the output-side engaged portion 43 of the engaging element 5 are engaged without any rattle. As a result, the rotational torque input to the input member 3 is transmitted to the output member 4 via the two engaging elements 5 and output from the output member 4.

[0196] When rotational torque is input in reverse to the output member 4, the two engaging elements 5 move toward the pressed surface 7, regardless of the rotation direction of the output member 4. Specifically, as shown in Figure 9, the output-side engaging portion 19 rotates in the direction of rotation of the output member 4 (clockwise in the example of Figure 9) inside the output-side engaged portions 43 of the two engaging elements 5. The flat surface 22 of the outer circumferential surface of the output-side engaging portion 19 presses the output-side engaged portions 43 radially outward, causing the two engaging elements 5 to move toward the pressed surface 7.

[0197] In other words, the two engaging elements 5 move radially outward, away from each other, based on their engagement with the output member 4, so that the pressing surfaces 41 of the two engaging elements 5 come into contact with the pressed surface 7 and frictionally engage with the pressed surface 7.

[0198] As a result, the rotational torque reversed into the output member 4 is either completely blocked and not transmitted to the input member 3, or only a portion of the rotational torque reversed into the output member 4 is transmitted to the input member 3 and the rest is blocked.

[0199] In order to completely block the rotational torque that is reverse-input to the output member 4 and prevent it from being transmitted to the input member 3, the engaging element 5 is braced (clamped) between the output-side engaging part 19 and the pressed member 2 so that the pressing surface 41 of the engaging element 5 does not slide (rotate relative to) the pressed surface 7, thereby locking the output member 4.

[0200] To ensure that only a portion of the rotational torque inverted to the output member 4 is transmitted to the input member 3 and the remainder is blocked, the engaging element 5 is braced (clamped) between the output-side engaging portion 19 and the pressed member 2 so that the pressing surface 41 of the engaging element 5 slides against the pressed surface 7, thereby partially locking the output member 4.

[0201] In the reverse input blocking clutch 1 of this example, the size of the gaps between each component is adjusted so that the above operation is possible. In particular, when the pressing surfaces 41 of the two engaging elements 5 are in contact with the pressed surface 7, a gap exists between the radially inner surface 16 of the input-side engaging portion 14 and the radially inner surface 44 of the input-side engaged portion 42.

[0202] This prevents the radial outward movement of the engaging element 5 from being blocked by the input-side engaging portion 14 when rotational torque is input in reverse to the output member 4, and also ensures that even after the pressing surface 41 contacts the pressed surface 7, the surface pressure acting on the contact portion between the pressing surface 41 and the pressed surface 7 changes according to the magnitude of the rotational torque input in reverse to the output member 4, thereby ensuring that the output member 4 is properly locked or partially locked.

[0203] In the reverse input blocking clutch 1 of this disclosure, the stopper member 6 can be effectively prevented from falling off the output member 4, thereby reliably preventing the engaging element 5 from tilting in the axial direction, and preventing the assembly, which is a sub-assembly of the output member 4, engaging element 5, spacer 59, and stopper member 6, from falling off the output member 4 and disassembling during transport.

[0204] Furthermore, in the reverse input blocking clutch 1 of this disclosure, the stopper member 6 has both the function of a retaining ring and a spacer positioned adjacent to the retaining ring in a conventional reverse input blocking clutch, thus reducing the number of parts.

[0205] [Second Example] A second example of the embodiment of the present disclosure will be described with reference to Figures 11 and 12.

[0206] In this example, only the structure of the crimped portion 51a and the flange portion 53a of the stopper member 6a differs from the structure of the first example. The structure of the other parts, including the mounting shaft portion 20, is the same as the structure of the reverse input blocking clutch 1 in the first example.

[0207] The crimping portion 51a is configured as a continuous annular shape in the circumferential direction. The crimping portion 51a is connected to one end of the cylindrical portion 52a on the axial side. The crimping portion 51a has a conical shape in which its outer and inner diameters decrease towards one side on the axial direction.

[0208] The crimped portion 51a is pressed against the outer circumferential surface of the mounting shaft portion 20 only at two locations opposite each other in the diametrical direction. In other words, the crimped portion 51a is inserted into the recess 28 provided in the convex curved surface 26 only at two locations opposite each other in the diametrical direction.

[0209] The crimped portion 51a has its radially inner surface pressed against the first inclined surface 30 of the inner surface 29 of the recess 28 at two locations on opposite sides in the diametrical direction, and its axial edge is axially engaged with the second inclined surface 31 of the inner surface 29 of the recess 28, which constitutes the engagement surface 27.

[0210] The crimped portion 51a is formed by fitting the cylindrical portion 52a onto the mounting shaft portion 20, and then plastically deforming one end of the cylindrical portion 52a on one axial side itself radially inward along its entire circumference.

[0211] The flange portion 53a is constructed in the shape of a hollow disc and has a circular outer peripheral edge portion 54a. The flange portion 53a has an outer diameter smaller than the diameter of the inscribed circle of the input-side engaging portion 14. The inscribed circle of the input-side engaging portion 14 refers to a virtual circle that passes through the radially inner end of the input-side engaging portion 14 with the central axis of the input member 3 as the center.

[0212] In this example, since the crimped portion 51a is continuous in the circumferential direction, even when the stopper member 6a rotates relative to the mounting shaft portion 20, one of the circumferential portions of the crimped portion 51a will engage axially with the engaging surface 27 provided on the outer circumferential surface of the mounting shaft portion 20. Therefore, even when the stopper member 6a rotates relative to the mounting shaft portion 20, the stopper member 6a is prevented from falling off the mounting shaft portion 20.

[0213] In this example, relative rotation of the stopper member 6a with respect to the mounting shaft portion 20 is permitted, so the flange portion 53a has an outer diameter smaller than the diameter of the inscribed circle of the input-side engaging portion 14. Therefore, even if the stopper member 6a rotates relative to the mounting shaft portion 20, the flange portion 53a will not engage with the input-side engaging portion 14 in the circumferential direction.

[0214] The other components and effects of the second example are the same as those of the first example.

[0215] The first and second embodiments of this disclosure can be combined as appropriate, as long as they do not create a contradiction.

[0216] 1 Reverse input blocking clutch 2 Pressed member 3 Input member 4 Output member 5 Engaging element 6, 6a Stopper member 7 Pressed surface 8 Housing element 9 Large diameter cylindrical surface 10 Small diameter cylindrical surface 11 Connecting surface 12 Inward flange 13 Screw hole 14 Input side engaging part 15 Input shaft 16 Radial inner surface 17 Input flange 18 Radial outer surface 19 Output side engaging part 20 Mounting shaft 21 Output shaft 22 Flat surface 23 Convex curved surface 24 End face 25 Flat surface 26 Convex curved surface 27 Engaging surface 28 Recess 29 Inner surface 30 First inclined surface 31 Second inclined surface 32 End face 33 Large diameter part 34 Medium diameter part 35 Small diameter part 36 Flange 37 Reducer 38 Drive pulley 39a, 39b Radial rolling bearing 40 Corner radius 41 Pressing surface 42 Input side engaged part 43 Output side engaged part 44 Radial inner surface 45 Radial outer surface 46 Circumferential surface 47 Flat surface 48 Convex part 49 End face 50 End face 51, 51a Crimped part 52, 52a Cylindrical part 53, 53a Flange part 54, 54a Outer peripheral edge 55 Claw part 56 Side surface 57 Straight part 58 Arc part 59 Spacer 60 End face 61 End face 62 Through hole 63 Chamfered part 64 Biasing member 65 Support member 66 Bearing holder 67 Partial cylindrical part 68 Outward flange part 69 Through hole 70 Bolt 71 Toothed belt

Claims

1. A pressed member having a pressed surface on its inner circumferential surface; an input member having an input-side engaging portion arranged radially inward of the pressed surface, connected to an input-side mechanism on one axial side, and arranged coaxially with the pressed surface; an output member having an output-side engaging portion arranged radially inward of the input-side engaging portion, connected to an output-side mechanism on the other axial side, and arranged coaxially with the pressed surface; an engaging element having a pressing surface facing 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 arranged to allow movement of the pressing surface in the near and far directions relative to the pressed surface; and a stopper member that restricts the axial movement of the engaging element relative to the output member. When rotational torque is input to the input member, the engaging element moves radially away from the pressed surface based on the input-side engaging portion engaging with the input-side engaged portion, thereby engaging the output-side engaged portion with the output-side engaging portion and transmitting the rotational torque input to the input member to the output member. Conversely, when rotational torque is input in reverse to the output member, the engaging element presses the pressing surface against the pressed surface based on the output-side engaging portion engaging with the output-side engaged portion, causing the pressing surface to frictionally engage with the pressed surface. The output member has a mounting shaft portion that protrudes axially from one end face of the output-side engaging portion toward the other axial side. The stopper member comprises a cylindrical portion fitted onto the mounting shaft, a flange portion connected to the other axial side of the cylindrical portion and facing the axial end face of the engaging element in the axial direction, and a crimping portion formed on at least a part of the cylindrical portion or connected to at least a part of the circumferential direction of the end on one axial side of the cylindrical portion, and is crimped and fixed to the mounting shaft by the crimping portion, wherein the stopper member comprises a cylindrical portion fitted onto the mounting shaft, a flange portion connected to the other axial side of the cylindrical portion and facing the axial end face in the axial direction, and the stopper member comprises a reverse input blocking clutch.

2. The reverse input blocking clutch according to claim 1, wherein the crimping portion is connected to one end of the cylindrical portion on the axial side and is configured as a projection.

3. The reverse input blocking clutch according to claim 2, wherein the crimping portions are provided at two locations on opposite sides in the diametrical direction of the cylindrical portion.

4. The crimping portion is configured in a continuous annular shape in the circumferential direction, the reverse input blocking clutch according to claim 1.

5. The reverse input blocking clutch according to claim 4, wherein the crimping portion is connected to one end of the cylindrical portion on the axial side and is configured in a conical shape.

6. The reverse input blocking clutch according to any one of claims 1 to 5, wherein the mounting shaft portion has an engagement surface on its outer circumferential surface that engages with the crimping portion in the axial direction and faces the other side in the axial direction.

7. The reverse input blocking clutch according to claim 6, wherein the mounting shaft portion has a recess on its outer circumferential surface into which the crimping portion fits, and the engaging surface is formed by the inner surface of the recess.

8. The reverse input blocking clutch according to claim 7, wherein the recesses are provided at two locations on the diametrically opposite sides of the outer circumferential surface of the mounting shaft portion.

9. The reverse input blocking clutch according to any one of claims 1 to 8, wherein an axial gap is provided between the end face on one axial side of the engaging element and the side surface on the other axial side of the flange portion.

10. The reverse input blocking clutch according to any one of claims 1 to 9, wherein the flange portion has a non-circular outer peripheral edge when viewed from the axial direction, and engages with the input side engaging portion in the circumferential direction to prevent relative rotation of the stopper member with respect to the mounting shaft portion.

11. The reverse input shutoff clutch according to any one of claims 1 to 9, wherein the flange portion has a circular outer peripheral edge when viewed from the axial direction and has an outer diameter smaller than the diameter of the inscribed circle of the input side engaging portion.

12. The reverse input blocking clutch according to any one of claims 1 to 11, wherein the stopper member abuts against one axial end face of the output-side engaging portion, thereby axially positioning it with respect to the output member.

13. The reverse input blocking clutch according to any one of claims 1 to 12, wherein the mounting shaft portion has a non-cylindrical shape.

14. The reverse input shutoff clutch according to claim 13, wherein the mounting shaft portion has a cross-sectional shape identical or similar to the end face on one axial side of the output-side engaging portion.

15. The reverse input blocking clutch according to any one of claims 1 to 14, wherein the output member has an output shaft portion from which the output side engaging portion protrudes toward the one axial side from one end face thereon, and a spacer is disposed between the one axial end face of the output shaft portion and the other axial end face of the engaging element.

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