Reverse input cutoff clutch

Abstract

A structure is realized that can switch between enabling and disabling a reverse input blocking function that prevents torque reversely input to the output member from being transmitted to the input member. [Solution] The pressed member (2) has a fixed element (7) that is supported and fixed to a part that does not rotate even when in use, a movable element (8) that is supported radially inside the fixed element (7) so that it can rotate relative to the fixed element (7), and a connecting member (9) that spans between the fixed element (7) and the movable element (8) so that it can be engaged and disengaged with at least one of the fixed element (7) and the movable element (8).

Description

[Technical Field]

[0001] The present disclosure relates to a reverse input disconnecting clutch that transmits rotational torque input to an input member to an output member, while completely blocking rotational torque that is reversely input to the output member and not transmitting it to the input member, or that transmits only a portion of the torque to the input member and blocks the remainder. [Background technology]

[0002] A reverse input cut-off clutch has an input member connected to an input side mechanism such as a drive source, and an output member connected to an output side mechanism such as a reduction mechanism, and has the function of transmitting the rotational torque input to the input member to the output member, while completely cutting off the rotational torque input in reverse to the output member, so that it is not transmitted to the input member, or by transmitting only a portion of it to the input member and cutting off the remainder.

[0003] Reverse input cutoff clutches are broadly classified into locking and free types depending on the mechanism that cuts off the rotational torque that is reversely input to the output member. A locking reverse input cutoff clutch is equipped with a mechanism that prevents the output member from rotating when rotational torque is reversely input to the output member. On the other hand, a free type reverse input cutoff clutch is equipped with a mechanism that causes the output member to spin freely when rotational torque is input to the output member. Whether to use a locking reverse input cutoff clutch or a free type reverse input cutoff clutch is determined appropriately depending on the application of the device into which the reverse input cutoff clutch is incorporated, etc.

[0004] WO 2019 / 026794 describes a locking reverse input cutoff clutch. The reverse input cutoff clutch described in WO 2019 / 026794 includes a pressed member, an input member, an output member, and an engagement element.

[0005] The pressed member has a pressed surface on its inner circumferential surface.

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

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

[0008] The engaging element has a pressing surface facing the pressed surface, an input side engaged portion engageable with the input side engaging portion, and an output side engaged portion engageable with the output side engaging portion, and is arranged so as to be able to move in a first direction, which is the direction towards or away from the pressed surface.

[0009] In the reverse input cutoff clutch described in WO 2019 / 026794, when rotational torque is input to the input member, the input-side engaging portion engages with the input-side engaged portion, causing the engager to move in a direction away from the pressed surface and engage the output-side engaged portion with the output-side engaging portion, thereby transmitting the rotational torque input to the input member to the output member. On the other hand, when rotational torque is reversely input to the output member, the output-side engaging portion engages with the output-side engaged portion, causing the engager to move in a direction approaching the pressed surface and pressing the pressing surface against the pressed surface, causing the pressing surface to frictionally engage with the pressed surface. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] International Publication No. 2019 / 026794 Brochure Summary of the Invention [Problem to be solved by the invention]

[0011] The reverse input cutoff clutch described in WO 2019 / 026794, once installed in the torque transmission path of a mechanical device, does not transmit torque reversely input to the output member to the input member, regardless of the direction of rotation. Therefore, if, for example, a failure occurs in the drive source connected to the input member and torque cannot be input from the input member to the reverse input cutoff clutch, even if an attempt is made to rotate the output member to change the position or posture of the driven member connected to the output member in order to ensure safety, the rotation of the output member will be locked.

[0012] The present disclosure aims to realize a reverse input blocking clutch structure that can switch between enabling and disabling a reverse input blocking function that prevents torque reversely input to an output member from being transmitted to an input member. [Means for solving the problem]

[0013] A reverse input disconnecting clutch according to one aspect of the present disclosure includes a pressed member, an input member, an output member, and an engagement element.

[0014] The pressed member has a pressed surface on its inner circumferential surface.

[0015] The input member has an input-side engaging portion disposed radially inside the pressed surface, and is disposed coaxially with the pressed surface.

[0016] The output member has an output-side engaging portion that is arranged radially inward of the input-side engaging portion on the radially inner side of the pressed surface, and is arranged coaxially with the pressed surface.

[0017] The engaging element has a pressing surface facing the pressed surface, an input side engaged portion engageable with the input side engaging portion, and an output side engaged portion engageable with the output side engaging portion, and is arranged so as to be able to move in a first direction, which is the direction in which the pressing surface moves towards or away from the pressed surface.

[0018] Furthermore, when a rotational torque is input to the input member, the engaging element moves in a direction away from the pressed surface in the first direction based on the engagement of the input side engaging portion with the input side engaged portion, and transmits the rotational torque input to the input member to the output member by engaging the output side engaged portion with the output side engaging portion, whereas when a rotational torque is input in the reverse direction to the output member, the output side engaging portion engages with the output side engaged portion, and presses the pressing surface against the pressed surface, causing the pressing surface to frictionally engage with the pressed surface.

[0019] In particular, in the reverse input disconnecting clutch of one aspect of the present disclosure, The pressed member is A fixed element that does not rotate during use; a movable element supported radially inside the fixed element so as to be rotatable relative to the fixed element, the movable element having the pressed surface; a coupling member that is stretched across the fixed element and the movable element and that can be engaged with and disengaged from at least one of the fixed element and the movable element; It has.

[0020] The pressed member prevents the movable element from rotating relative to the fixed element by engaging the connecting member with the fixed element and the movable element, whereas the pressed member allows the movable element to rotate relative to the fixed element by disengaging the connecting member from at least one of the fixed element and the movable element.

[0021] In the reverse input disconnecting clutch according to one aspect of the present disclosure, the pressed member may have a rolling bearing disposed between the fixed element and the movable element.

[0022] In the reverse input disconnect clutch according to one aspect of the present disclosure, the fixed element may have a fixed-side engaging portion, the movable element may have a movable-side engaging portion, and the connecting member may be configured as a columnar or tubular member. In this case, a portion of the connecting member in the extension direction engages with the fixed-side engaging portion, and the remaining portion of the connecting member in the extension direction engages with the movable-side engaging portion.

[0023] In one aspect of the reverse input cut-off clutch of the present disclosure, the connecting member can be constituted by a bolt having a male threaded portion on its outer surface that screws into a female threaded portion provided on the fixed side engaging portion or the movable side engaging portion.

[0024] In the reverse input cutoff clutch according to one aspect of the present disclosure, the fixed-side engagement portion may be configured with a fixed-side engagement hole formed at a twisted position with respect to the central axis of the pressed surface, in which case both ends of the connecting member in the extension direction engage with the fixed-side engagement hole, and an intermediate portion of the connecting member in the extension direction engages with the movable-side engagement portion.

[0025] In the reverse input disconnecting clutch according to one aspect of the present disclosure, the movable side engaging portion can be configured by a recessed groove formed on an outer peripheral surface of the movable element.

[0026] In the reverse input disconnecting clutch according to one aspect of the present disclosure, the movable side engaging portion may be configured with a flat surface.

[0027] In one aspect of the reverse input disconnection clutch of the present disclosure, the fixed side engagement portion can be constituted by a fixed side engagement hole that penetrates radially, and the movable side engagement portion can be constituted by a movable side engagement hole that opens to the outer circumferential surface.

[0028] In one aspect of the reverse input disconnection clutch of the present disclosure, the fixed side engagement portion can be constituted by a fixed side engagement hole that penetrates in the axial direction, and the movable side engagement portion can be constituted by a movable side engagement hole that opens in the axial direction.

[0029] The reverse input cutoff clutch according to one aspect of the present disclosure may include a biasing member that elastically biases the engagement element in a direction that brings the engagement element closer to the pressed surface. [Effects of the Invention]

[0030] According to the reverse input blocking clutch of one aspect of the present disclosure, it is possible to switch between enabling and disabling the reverse input blocking function that prevents torque reversely input to the output member from being transmitted to the input member. [Brief explanation of the drawings]

[0031] [Figure 1] FIG. 1(A) is an oblique view of a reverse input cutoff clutch of a first example of an embodiment of the present disclosure, and FIG. 1(B) is an end view of the reverse input cutoff clutch of the first example as viewed from the input member side in the axial direction. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. 1(B). [Figure 3] FIG. 3 is a cross-sectional view taken along the line B1-B2-B3-B4 of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along CC in FIG. 2, with the biasing member omitted. [Figure 5] FIG. 5 is a view similar to FIG. 4, showing a state in which a rotational torque is input to the input member. [Figure 6] FIG. 6 is a view similar to FIG. 4, showing a state in which a rotational torque is reversely input to the output member. [Figure 7] FIG. 7 is an exploded perspective view of the reverse input cutoff clutch of the first example. [Figure 8] FIG. 8 is a cross-sectional view showing a pressed member of a reverse input cutoff clutch according to a second example of an embodiment of the present disclosure. [Figure 9] FIG. 9 is a cross-sectional view showing a pressed member of a reverse input cutoff clutch according to a third example of an embodiment of the present disclosure. [Figure 10] FIG. 10(A) is a cross-sectional view showing a pressed member of a reverse input cutoff clutch according to a fourth example of an embodiment of the present disclosure, and FIG. 10(B) is a perspective view showing a movable element. [Figure 11]FIG. 11(A) is a perspective view showing a pressed member of a reverse input cutoff clutch in a fifth example of an embodiment of the present disclosure, and FIG. 11(B) is a side view of the pressed member. [Figure 12] FIG. 12 is a cross-sectional view showing a pressed member of a reverse input cutoff clutch according to a sixth example of an embodiment of the present disclosure. [Figure 13] FIG. 13 is a cross-sectional view showing a pressed member of a reverse input cutoff clutch according to a seventh example of an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0032] [Example 1] A first example of an embodiment of the present disclosure will be described with reference to FIGS. 1 to 7. Note that, unless otherwise specified, the axial, radial, and circumferential directions refer to the axial, radial, and circumferential directions of the reverse input disconnection clutch 1. In this example, the axial, radial, and circumferential directions of the reverse input disconnection clutch 1 coincide with the axial, radial, and circumferential directions of the input member 3, coincide with the axial, radial, and circumferential directions of the pressed surface 6, and coincide with the axial, radial, and circumferential directions of the output member 4. Furthermore, one axial side refers to the input member 3 side (the right side in FIG. 2), and the other axial side refers to the output member 4 side (the left side in FIG. 2).

[0033] <Explanation of the structure of the reverse input cutoff clutch> The reverse input cutoff clutch 1 of this example includes a pressed member 2, an input member 3, an output member 4, and an engaging element 5. The reverse input cutoff clutch 1 transmits the rotational torque input to the input member 3 to the output member 4, but has a reverse input cutoff function that either completely cuts off the rotational torque that is reversely input 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 cuts off the remainder, and the reverse input cutoff function can be switched between enabled and disabled.

[0034] {Pressure-receiving member} The pressed member 2 has a pressed surface 6 on its inner circumferential surface. The input-side engaging portion 31 of the input member 3 and the output-side engaging portion 38 of the output member 4 are disposed radially inside the pressed surface 6. The input-side engaging portion 31, the output-side engaging portion 38, and the engaging element 5 are capable of rotating around the central axis of the pressed surface 6 on the radially inside of the pressed surface 6. In addition, the pressed surface 6 forms a surface that comes into contact with the pressing surface 50 of the engaging element 5 when the engaging element 5 moves in a direction approaching the pressed surface 6.

[0035] The pressed surface 6 has a circular ring shape when viewed in the axial direction, and in this example has a cylindrical surface shape whose inner diameter does not change in the axial direction, although this is not limited to this.

[0036] The pressed member 2 has a fixed element 7 that does not rotate even when in use, a movable element 8 that is supported radially inside the fixed element 7 so as to be able to rotate relative to the fixed element 7 and has a pressed surface 6, and a connecting member 9 that is stretched across the fixed element 7 and the movable element 8 so as to be able to engage and disengage with at least one of the fixed element 7 and the movable element 8.

[0037] The pressed member 2 prevents the movable element 8 from rotating relative to the fixed element 7 by engaging the connecting member 9 with the fixed element 7 and the movable element 8, and allows the movable element 8 to rotate relative to the fixed element 7 by disengaging the connecting member 9 from at least one of the fixed element 7 and the movable element 8.

[0038] When the coupling member 9 engages with the fixed element 7 and the movable element 8, preventing the movable element 8 from rotating relative to the fixed element 7, the reverse input blocking function is switched to enabled, whereas when the coupling member 9 disengages from at least one of the fixed element 7 and the movable element 8, allowing the movable element 8 to rotate relative to the fixed element 7, the reverse input blocking function is switched to disabled.

[0039] Specifically, the coupling member 9 is spanned between the fixed element 7 and the movable element 8, allowing the coupling member 9 to be engaged with or disengaged from one of the fixed element 7 and the movable element 8, or to be engaged with or disengaged from both the fixed element 7 and the movable element 8.

[0040] In the normal use state of the reverse input cutoff clutch 1 after it has been incorporated into the torque transmission path of a mechanical device, the coupling member 9 is engaged across both the fixed element 7 and the movable element 8. In this state, the reverse input cutoff clutch 1 has its reverse input cutoff function active, and transmits the rotational torque input to the input member 3 to the output member 4, while completely cutting off the rotational torque reversely input to the output member 4 and not transmitting it to the input member 3, or transmitting only a portion of it to the input member 3 and cutting off the remainder.

[0041] In contrast, if a malfunction occurs in the mechanical device, the coupling member 9 can be removed by pulling it out from at least one of the fixed element 7 and the movable element 8 using any means such as a tool, thereby disengaging the coupling member 9 from at least one of the fixed element 7 and the movable element 8. This disables the reverse input blocking function of the reverse input blocking clutch 1, allowing relative rotation of the movable element 8 with respect to the fixed element 7. Therefore, the input member 3, output member 4, engaging element 5, and movable element 8 rotate together, allowing torque to be transmitted from the output member 4 to the input member 3. This makes it possible to change the position, attitude, etc. of the driven member connected to the output member 4.

[0042] The engagement between the fixed element 7 and the movable element 8 and the coupling member 9 in the reverse input cutoff clutch 1 can be any configuration as long as the coupling member 9 can be engaged with or disengaged from one of the fixed element 7 and the movable element 8. A preferred form of engagement is a mechanical coupling that prevents relative axial separation, relative radial movement, and relative rotation between the fixed element 7 and the movable element 8 when the coupling member 9 is stretched across the fixed element 7 and the movable element 8 in at least one of the axial, radial, and circumferential directions (including the direction of extension of the string), and allows relative rotation between the fixed element 7 and the movable element 8 when the coupling member 9 is disengaged from at least one of the fixed element 7 and the movable element 8, and then allows the fixed element 7 and the movable element 8 to restore the coupled state. For example, when the coupling member 9 is configured as a solid columnar member or a hollow cylindrical member including a bolt, pin, key, or the like, which is a type of mechanical coupling material, it is preferred that the fixed element 7 and the movable element 8 be provided with an engagement portion for the coupling member 9. The engagement between the fixed element 7 and the movable element 8 and the coupling member 9 in this example will be described in more detail below, but the present disclosure is not limited to this.

[0043] (fixed element) The fixed element 7 is supported and fixed to a fixed part such as a housing that does not rotate even when in use, or is configured by the fixed part itself. The specific structure of the fixed element 7 is arbitrary as long as it has a structure for supporting the movable element 8 on the radially inner side and a structure for engaging with a part of the connecting member 9. In this example, the fixed element 7 has a fixed-side engaging part 10. The fixed-side engaging part 10 configures a part that engages with a part of the connecting member 9.

[0044] The shape, forming direction, and forming position of the fixed side engaging portion 10 are not particularly limited as long as they correspond to the structure of the connecting member 9 and can realize the function of the fixed side engaging portion 10. For example, the fixed side engaging portion 10 can have any structure such as a hole, groove, surface, or protrusion. When the connecting member 9 is configured as a solid column or a hollow cylinder, the fixed side engaging portion 10 can be configured as an engaging hole. Furthermore, the fixed side engaging portion 10 can be formed so as to be in a twisted position with respect to the central axis O7 of the fixed element 7. In other words, the central axis O7 of the fixed side engaging portion 10 can be formed so as to be twisted with respect to the central axis O7 of the fixed element 7. 10 The fixed-side engaging portion 10 can be formed so that the central axis O7 of the fixed element 7 intersects with the central axis O7 of the fixed element 7 at an intersection. Alternatively, the fixed-side engaging portion 10 can be formed in the axial or radial direction. The fixed-side engaging portion 10 has a cross-sectional shape that corresponds to the cross-sectional shape of the connecting member 9.

[0045] In this example, the fixed-side engaging portion 10 is formed to be at a twisted position with respect to the central axis O7 of the fixed element 7, and is configured as a fixed-side engaging hole having a circular cross section. Specifically, in this example, in a cross section perpendicular to the central axis O7 of the fixed element 7, the central axis O7 of the fixed element 7 and the central axis O 10 are arranged apart from each other in the radial direction of the fixing element 7 and are aligned with the central axis O7 of the fixing element 7 and the central axis O of the fixing side engagement portion 10. 10 2 and 3), the central axis O7 of the fixed element 7 and the central axis O of the fixed-side engaging portion 10 are 10 and are perpendicular to each other (central axis O 10 The fixed side engaging portion 10 is formed so that the ends of the fixed side engaging portion 10 form one chord of a circle centered on the central axis O7.

[0046] In this example, the fixing element 7 has an inner peripheral surface that is a stepped cylindrical surface, as shown in Fig. 2. Specifically, the inner peripheral surface of the fixing element 7 includes a large-diameter cylindrical surface portion 11 on one axial side, a small-diameter cylindrical surface portion 12 on the other axial side, and a connecting surface portion 13 that connects the large-diameter cylindrical surface portion 11 and the small-diameter cylindrical surface portion 12 and faces the one axial side. The large-diameter cylindrical surface portion 11 has a locking groove 14 around the entire circumference in the axial middle portion.

[0047] The fixing element 7 has a cylindrical outer peripheral surface that does not change in the axial direction.

[0048] Therefore, the fixing element 7 has a thin portion 15 on one axial side and a thick portion 16 on the other axial side, and is configured to have a substantially cylindrical shape as a whole.

[0049] The fixed-side engagement portion 10, which is constituted by the fixed-side engagement hole, is formed in the thick-walled portion 16 so as to be in a twisted position with respect to the central axis O7 of the fixed element 7. As shown in Fig. 3, both ends of the fixed-side engagement portion 10 in the extension direction (the axial direction of the fixed-side engagement portion 10 itself) open to the outer circumferential surface of the fixed element 7, and the intermediate portion of the fixed-side engagement portion 10 in the extension direction opens to the small-diameter cylindrical surface portion 12. Therefore, the fixed-side engagement portion 10 has holes 17a, 17b, which open to the outer circumferential surface and inner circumferential surface (small-diameter cylindrical surface portion 12) of the thick-walled portion 16 and have a circular cross-sectional shape, at both sides in the extension direction, and has a groove 18, which opens to the small-diameter cylindrical surface portion 12 and has a circular cross-sectional shape, at the intermediate portion in the extension direction.

[0050] The number of fixed-side engaging portions 10 is determined according to the number of connecting members 9, and when the connecting member 9 is made up of a plurality of connecting members 9, the fixed-side engaging portions 10 are also made up of a plurality of fixed-side engaging portions 10.

[0051] In the reverse input cutoff clutch 1 of this example, the connecting member 9 is configured by two connecting members 9. Therefore, the fixed side engaging portion 10 is configured by two fixed side engaging portions 10 to match the number of connecting members 9. The two fixed side engaging portions 10 are arranged at two locations on radially opposite sides of the thick portion 16.

[0052] (moving element) The movable element 8 is normally coupled to the fixed element 7 via the coupling member 9, and rotation relative to the fixed portion is prevented. However, when necessary, such as when a malfunction occurs in a mechanical device incorporating the reverse input cutoff clutch 1, the coupling with the fixed element 7 is released, and the pressed surface 6 and the pressing surface 50 of the engaging element 5 are engaged, allowing the input member 3, output member 4, and engaging element 5 to rotate together. The specific structure of the movable element 8 is arbitrary, as long as it has a structure that engages with the remaining portion of the coupling member 9. In this example, the movable element 8 has a movable-side engaging portion 19. The movable-side engaging portion 19 constitutes the portion that engages with the remaining portion of the coupling member 9 that is not engaged with the fixed-side engaging portion 10.

[0053] The shape, forming direction, and forming position of the movable-side engaging portion 19 are not particularly limited as long as it can engage with the remaining portion of the coupling member 9. For example, the movable-side engaging portion 19 can have any structure, such as a hole, groove, surface, or protrusion. When the coupling member 9 is configured in a columnar or cylindrical shape, the movable-side engaging portion 19 can be configured with an engaging hole, a recessed groove, or a flat surface. Furthermore, the movable-side engaging portion 19 can be formed so as to be in a twisted position with respect to the central axis O7 of the fixed element 7, or can be formed in the axial or radial direction. Furthermore, the movable-side engaging portion 19 has a cross-sectional shape that corresponds to the cross-sectional shape of the coupling member 9.

[0054] In this example, the movable-side engaging portion 19 is formed on the outer peripheral surface of the movable element 8 and is configured as a recessed groove having an arc-shaped cross section.

[0055] The movable element 8 is disposed radially inside the fixed element 7. As a structure for supporting the movable element 8 so that it can rotate relative to the fixed element 7, a structure in which at least a portion of the movable element 8 is fitted radially inside the fixed element 7 directly or via another member such as a bearing can be employed.

[0056] In this example, the movable element 8 has an inner circumferential surface in the form of a stepped cylindrical surface, as shown in Fig. 2. Specifically, the inner circumferential surface of the movable element 8 includes a large-diameter cylindrical surface portion 20 on one axial side, a small-diameter cylindrical surface portion 21 on the other axial side, and a connecting surface portion 22 that connects the large-diameter cylindrical surface portion 20 and the small-diameter cylindrical surface portion 21 and faces the one axial side. In this example, the large-diameter cylindrical surface portion 20 forms the pressed surface 6.

[0057] The movable element 8 has an outer peripheral surface in the shape of a stepped cylindrical surface. Specifically, the outer peripheral surface of the movable element 8 includes a large-diameter cylindrical surface portion 23 on one axial side, a small-diameter cylindrical surface portion 24 on the other axial side, and a connecting surface portion 25 that connects the large-diameter cylindrical surface portion 23 and the small-diameter cylindrical surface portion 24 and faces the other axial side.

[0058] The movable-side engaging portion 19, which is formed by a recessed groove, is formed on the other axial side of the small-diameter cylindrical surface portion 24 so as to be at a twisted position with respect to the central axis of the movable element 8. In other words, the movable-side engaging portion 19 is 19 and the central axis O7 of the fixing element 7 intersect with each other in a three-dimensional fashion.

[0059] The number of movable-side engaging portions 19 is determined according to the number of connecting members 9, and when the connecting member 9 is made up of a plurality of connecting members 9, the movable-side engaging portions 19 are also made up of a plurality of movable-side engaging portions 19.

[0060] In the reverse input cutoff clutch 1 of this example, the connecting member 9 is made up of two connecting members 9. Therefore, the movable side engaging portion 19 is made up of two movable side engaging portions 19 in accordance with the number of connecting members 9. The two movable side engaging portions 19 are formed at two radially opposite locations on the other axial side portion of the small diameter cylindrical surface portion 24.

[0061] The movable element 8 has an inward flange portion 26 that protrudes radially inward at the end portion on the axial end side of the small diameter cylindrical surface portion 21.

[0062] (Connecting member) The material and structure of the connecting member 9 are arbitrary as long as it can be engaged with and disengaged from at least one of the fixed element 7 and the movable element 8 and can prevent relative rotation between the fixed element 7 and the movable element 8. The material that forms the connecting member 9 can be metal, such as an iron-based alloy or a light alloy, or synthetic resin.

[0063] The connecting member 9 may have any structure that can mechanically connect the fixed element 7 and the movable element 8, depending on the structure of the fixed element 7 including the fixed-side engaging portion 10. For example, the connecting member 9 may be formed of a columnar or cylindrical member including a bolt, pin, key, or the like.

[0064] When the connecting member 9 is formed by a bolt, at least a part of one of the fixed-side engaging portion 10 and the movable-side engaging portion 19 is formed by a screw hole. In this case, a male screw portion provided on the outer circumferential surface of the connecting member 9 is screwed into the screw hole, and the base end portion of the connecting member 9 is disposed (engaged) inside the other of the fixed-side engaging portion 10 and the movable-side engaging portion 19.

[0065] Alternatively, the connecting member 9 can be configured as a hollow cylindrical spring pin having a linear or wavy slit at one position in the circumferential direction thereof.

[0066] The cross-sectional shape of the connecting member 9 is not limited to a circle, but may be a non-circular shape such as a partial circle or a polygon. It is preferable that the cross-sectional shapes of the fixed-side engaging portion 10 provided on the fixed element 7 and the movable-side engaging portion 19 provided on the movable element 8 are determined according to the cross-sectional shape of the connecting member 9.

[0067] In this example, the connecting member 9 is a pin, which is a solid columnar member with a circular cross section. The connecting member 9 has tapered portions 71 at both ends in the extension direction, with the outer diameter decreasing toward both sides in the extension direction. This makes it easier to insert (press-fit) the connecting member 9 into the fixed-side engaging portion 10.

[0068] Both sides of the connecting member 9 in the extension direction (left and right direction in Figure 3) engage with both sides of the fixed side engagement portion 10 in the extension direction, and the middle part of the connecting member 9 in the extension direction engages with the middle part of the fixed side engagement portion 10 in the extension direction and the movable side engagement portion 19.

[0069] Specifically, both sides of the coupling member 9 in the extension direction are press-fitted or lightly press-fitted into the holes 17a and 17b, and the middle part of the coupling member 9 in the extension direction is disposed without any rattle between the groove 18 and the movable-side engaging part 19. The fitting strength of both sides of the coupling member 9 in the extension direction with the holes 17a and 17b is large enough to prevent the coupling member 9 from falling off from the holes 17a and 17b due to vibrations that accompany the operation of a machine in which the reverse input cutoff clutch 1 is incorporated, and to allow the coupling member 9 to be pulled out of the holes 17a and 17b by applying a force to the coupling member 9 in its axial direction when it is necessary to allow relative rotation of the movable element 8 with respect to the fixed element 7.

[0070] The extension dimension of the connecting member 9 is not particularly limited as long as it can engage with the fixed-side engaging portion 10 and the movable-side engaging portion 19. Specifically, the extension dimension of the connecting member 9 can be the same as the extension dimension of the fixed-side engaging portion 10, or it can be longer or shorter than the extension dimension of the fixed-side engaging portion 10. In this example, the extension dimension of the connecting member 9 is longer than the extension dimension of the fixed-side engaging portion 10. Therefore, when the connecting member 9 is engaged with the fixed-side engaging portion 10 and the movable-side engaging portion 19, both ends of the connecting member 9 in the extension direction protrude from both ends of the fixed-side engaging portion 10 in the extension direction.

[0071] [Rolling bearings] In this example, the pressed member 2 further includes a rolling bearing 27, which is an optional element, arranged between the fixed element 7 and the movable element 8. Although it is possible to support the movable element 8 radially inside the fixed element 7 so as to be relatively rotatable by directly fitting at least a portion of the inner circumferential surface of the fixed element 7 with at least a portion of the outer circumferential surface of the movable element 8, by providing the rolling bearing 27, it is possible to more easily rotate the movable element 8 while the fixed element 7 and the movable element 8 are in a state where they are relatively rotatable. Depending on the application of the reverse input disconnecting clutch 1, the rolling bearing 27 may be omitted. Alternatively, it is also possible to provide a known member, such as a slide bearing or grease, that enables the fixed element 7 and the movable element 8 to rotate relative to each other.

[0072] The rolling bearing 27 has an outer ring 28 fitted inside the fixed element 7, an inner ring 29 fitted outside the movable element 8, and a plurality of rolling elements 30 arranged freely rotatably between the outer ring 28 and the inner ring 29.

[0073] The outer ring 28 is fitted securely into the other axial side portion of the large diameter cylindrical surface portion 11, and is axially clamped between the connection surface portion 13 and the retaining ring 62 engaged in the engaging groove 14.

[0074] The inner ring 29 is fitted onto one axial side portion of the small-diameter cylindrical surface portion 24 without any rattle, and the end face on that axial side abuts against the connecting surface portion 25.

[0075] In this example, the rolling bearing 27 is configured as a single-row, deep-groove ball bearing that uses balls as the rolling elements 30. However, the rolling bearing 27 can also be configured as an angular ball bearing or a roller bearing that uses cylindrical rollers as the rolling elements 30, or can be configured by combining multiple rolling bearings.

[0076] [Input member] The input member 3 is rotatably supported relative to the fixed portion, and is disposed coaxially with the pressed surface 6. The input member 3 is connected to an input side mechanism such as a drive source, and receives an input of rotational torque, and is configured to be rotatable radially inside the pressed surface 6 due to the input of the rotational torque.

[0077] The input member 3 has an input-side engaging portion 31 arranged radially inward of the pressed surface 6. The input-side engaging portion 31 is provided in a portion radially outwardly spaced from the rotation center O of the input member 3, and has a portion that engages with the input-side engaged portion 51 of the engager 5. The input-side engaging portion 31 is configured so that its radially inner surface 34 engages (contacts) with the radially inner surface 53 of the input-side engaged portion 51 as the input member 3 or the engager 5 rotates.

[0078] In this example, the input member 3 has an input shaft portion 32 and an input flange portion 33 in addition to the input side engaging portion 31.

[0079] The input shaft portion 32 has a cylindrical shape.

[0080] The input flange portion 33 protrudes radially outward from the outer peripheral surface of the other axial end of the input shaft portion 32 over the entire circumference.

[0081] The input side engaging portion 31 protrudes from a portion of the side surface of the input flange portion 33 on the other axial side, the portion being radially outwardly spaced from the rotation center O, toward the other axial side.

[0082] The shape of the input side engaging portion 31 is not limited as long as it is configured to engage with the input side engaged portion 51 of the engaging element 5. Furthermore, the number of input side engaging portions 31 is determined according to the number of engaging elements 5, and when the engaging element 5 is configured with a plurality of engaging elements 5, the input side engaging portion 31 is also configured with a plurality of input side engaging portions 31.

[0083] In the reverse input cutoff clutch 1 of this example, the engaging elements 5 are configured with two engaging elements 5. Therefore, the input side engaging portion 31 is configured with two input side engaging portions 31 to match the number of engaging elements 5. The two input side engaging portions 31 are arranged at two radially opposite positions on the other axial side surface of the input flange portion 33, and are spaced apart from each other in the radial direction of the input member 3. Furthermore, each input side engaging portion 31 has a shape that is symmetrical in the circumferential direction.

[0084] In this example, each input-side engaging portion 31 has an end face shape that is generally fan-shaped or trapezoidal, with its circumferential width increasing radially outward when viewed from the axial direction. The radially inner side surfaces 34 of each input-side engaging portion 31 are formed of flat surfaces that are parallel to each other, and the radially outer side surfaces 35 of each input-side engaging portion 31 have the same cylindrical contour shape as the outer circumferential surface of the input flange portion 33. The two circumferential side surfaces 36 of each input-side engaging portion 31 are formed of flat surfaces that slope away from each other radially outward. The radially inner side surface 34 and the circumferential side surfaces 36 are connected by a curved surface portion 37 that has a generally arc-shaped contour when viewed from the axial direction.

[0085] [Output member] The output member 4 is rotatably supported relative to the pressed member 2 or the fixed portion, and is arranged coaxially with the pressed surface 6. In other words, the output member 4 is also arranged coaxially with the input member 3. The output member 4 is connected to an output mechanism such as a reduction mechanism, and is configured to output rotational torque to the output mechanism as it rotates.

[0086] The output member 4 has an output-side engaging portion 38 that is arranged radially inward of the input-side engaging portion 31 on the radially inner side of the pressed surface 6. The output-side engaging portion 38 is radially inward of the input-side engaging portion 31, but has a portion that is radially outward from the rotation center O of the output member 4, and this portion is arranged in a position where it can engage with the output-side engaged portion 52 of the engager 5. The output-side engaging portion 38 is configured so that this portion engages with the output-side engaged portion 52 as the output member 4 or the engager 5 rotates.

[0087] In this example, the output member 4 has an output shaft portion 39, an output flange portion 40, and a small diameter shaft portion 41 in addition to the output side engagement portion .

[0088] The output shaft portion 39 has a stepped cylindrical shape.

[0089] The output flange portion 40 protrudes radially outward from the outer peripheral surface of one axial end of the output shaft portion 39 over the entire circumference.

[0090] The output side engaging portion 38 protrudes from the center of a side surface on one axial side of the output shaft portion 39 toward one axial side.

[0091] The shape of the output side engaging portion 38 is not limited as long as it is configured to have a portion that engages with the output side engaged portion 52. Furthermore, the number of portions of the output side engaging portion 38 that engage with the output side engaged portion 52 is determined according to the number of engaging elements 5, and when the engaging element 5 is configured with a plurality of engaging elements 5, the output side engaging portion 38 is also configured to have a plurality of the engaging portions. Note that even when the engaging element is configured with a single engaging element, the output side engaging portion can have a plurality of the engaging portions.

[0092] In this example, the output side engaging portion 38 is configured to have portions that engage with two output side engaged portions 52, in accordance with the number of the engaging pieces 5.

[0093] In this example, the output-side engaging portion 38 has a substantially rectangular or oval end face shape when viewed in the axial direction, and protrudes from the center of one axial end face of the output shaft portion 39 toward one axial side. In other words, the distance from the rotation center O of the output member 4 to the outer circumferential surface of the output-side engaging portion 38, which is the portion that engages with the output-side engaged portion 52, is not constant in the circumferential direction. Therefore, the output-side engaging portion 38 has a cam function.

[0094] More specifically, the outer peripheral surface of the output-side engaging portion 38 is composed of two parallel flat surfaces 42 and two partially cylindrical convex surfaces 43. Therefore, the distance from the rotation center O of the output member 4 to the outer peripheral surface of the output-side engaging portion 38 is not constant in the circumferential direction. Each of the two convex surfaces 43 is composed of a partially cylindrical surface with the rotation center O of the output member 4 as its center.

[0095] The output-side engaging portion 38 is plane-symmetrical with respect to an imaginary plane that passes through the rotation center O of the output member 4 and is perpendicular to the flat surface 42. Furthermore, the output-side engaging portion 38 is plane-symmetrical with respect to an imaginary plane that passes through the rotation center O of the output member 4 and is parallel to the flat surface 42.

[0096] Such an output side engaging portion 38 is disposed between the two input side engaging portions 31.

[0097] The small diameter shaft portion 41 has a cylindrical shape and protrudes from the center of an end surface on one axial side of the output side engaging portion 38 toward one axial side.

[0098] In this example, the output member 4 is rotatably supported by a radial rolling bearing 44 radially inside the movable element 8 of the pressed member 2. An outer ring 45 of the radial rolling bearing 44 is fitted securely into the small-diameter cylindrical surface portion 21, and is axially sandwiched between a side surface on one axial direction side of the inward flange portion 26 and a snap ring 46a engaged with one axial end of the small-diameter cylindrical surface portion 21. An inner ring 47 of the radial rolling bearing 44 is fitted securely onto the outside of one axial end of the output shaft portion 39, and is axially sandwiched between a side surface on the other axial direction side of the output flange portion 40 and a snap ring 46b engaged with the outer peripheral surface of an axially intermediate portion of the output shaft portion 39.

[0099] In the illustrated example, the radial rolling bearing 44 is configured as a ball bearing that uses balls as the rolling elements 48. However, the radial rolling bearing for supporting the output member 4 can also be configured as a tapered roller bearing that uses tapered rollers as the rolling elements or a roller bearing that uses cylindrical rollers.

[0100] Furthermore, the small diameter shaft portion 41 of the output member 4 is supported by a slide bearing (sleeve) 49 on the inside of the input member 3 so as to be able to rotate freely relative to the input member 3.

[0101] [Engager] The engaging element 5 has a pressing surface 50 facing the pressed surface 6, an input side engaged portion 51 engageable with the input side engaging portion 31, and an output side engaged portion 52 engageable with the output side engaging portion 38, and is arranged so as to be able to move in a first direction, which is the direction towards or away from the pressed surface 6.

[0102] When a rotational torque is input to the input member 3, the engaging element 5 moves in a direction away from the pressed surface 6 in the first direction based on the input side engaging portion 31 engaging with the input side engaged portion 51, and transmits the rotational torque input to the input member 3 to the output member 4 by engaging the output side engaged portion 52 with the output side engaging portion 38, whereas when a rotational torque is input in the reverse direction to the output member 4, the output side engaging portion 38 engages with the output side engaged portion 52, pressing the pressing surface 50 against the pressed surface 6 and frictionally engaging the pressing surface 50 with the pressed surface 6.

[0103] The engaging element 5 may be configured by one engaging element 5 having such a configuration, or may be configured by two or more engaging elements 5.

[0104] In this example, the engaging element 5 is composed of two engaging elements 5. Each engaging element 5 functions as an engaging element 5. Each engaging element 5 has a substantially semicircular end face shape when viewed from the axial direction, and has a shape that is symmetrical with respect to the width direction (the direction indicated by arrow β in FIG. 4). The configuration of each engaging element 5 will be described below.

[0105] In this example, the radial direction with respect to the engaging element 5 is the direction of approach or distance of the pressing surface 50 relative to the pressed surface 6, and corresponds to the direction indicated by arrow α in Fig. 4. The width direction with respect to the engaging element 5 is the direction perpendicular to both the direction of approach or distance of the pressing surface 50 relative to the pressed surface 6 and the axial direction of the input member 3, and corresponds to the direction indicated by arrow β in Fig. 4. In this example, the radial direction with respect to the engaging element 5 is referred to as the first direction, and the width direction with respect to the engaging element 5 is referred to as the second direction.

[0106] The pressing surface 50 is provided on the radially outer surface of the engaging element 5 facing the pressed surface 6. In this example, the pressing surface 50 is composed of two pressing surfaces 50 provided at two positions spaced apart from each other in the circumferential direction on the radially outer surface of the engaging element 5. Each pressing surface 50 is composed of a partially cylindrical convex curved surface having a radius of curvature smaller than the radius of curvature of the pressed surface 6.

[0107] When viewed from the axial direction, the portion of the radially outer surface of the engaging element 5 that is circumferentially offset from the two pressing surfaces 50 is located radially inward of an imaginary circle that is centered on the central axis of the input member 3 and that is tangent to the two pressing surfaces 50. In other words, when the two pressing surfaces 50 are in contact with the pressed surface 6, the portion that is circumferentially offset from the two pressing surfaces 50 does not come into contact with the pressed surface 6.

[0108] The pressing surface 50 preferably has a surface property that gives it a higher coefficient of friction with the pressed surface 6 than the other parts of the engaging element 5. The pressing surface 50 can be formed integrally with the other parts of the engaging element 5, or can be formed by the surface of a friction material fixed to the other parts of the engaging element 5 by sticking or bonding.

[0109] In this example, the input-side engaged portion 51 is provided in a radially intermediate portion of the widthwise center portion of the engaging element 5. More specifically, although not limited to this, the input-side engaged portion 51 has a substantially arch-shaped opening when viewed in the axial direction, and is configured as a through-hole that axially passes through a radially intermediate portion of the widthwise center position of the engaging element 5.

[0110] The input-side engaged portion 51 has a size that allows the input-side engaging portion 31 to be loosely inserted therein. Therefore, with the input-side engaging portion 31 inserted inside the input-side engaged portion 51, there is a gap between the input-side engaging portion 31 and the inner surface of the input-side engaged portion 51 in both the width direction and the radial direction of the engaging element 5. Therefore, the input-side engaging portion 31 can be displaced relative to the input-side engaged portion 51 in the rotational direction of the input member 3, and the input-side engaged portion 51 can be displaced relative to the input-side engaging portion 31 in the radial direction of the engaging element 5.

[0111] The shape of the input side engaged portion 51 is not limited as long as it is configured to be able to engage with the input side engaging portion 31 .

[0112] In this example, of the inner surfaces of the input-side engaged portion 51, a radially inner surface 53 facing radially outward is configured as a flat surface perpendicular to the first direction, and a radially outer surface 54 facing radially inward is configured as a curved surface having a substantially arc-shaped outline when viewed from the axial direction or a compound surface having a substantially V-shaped outline. Circumferential side surfaces 55 connecting both ends of the radially inner surface 53 on the second direction and both ends of the radially outer surface 54 on the second direction are configured as concave curved surfaces having a partially cylindrical shape.

[0113] In this example, the output-side engaged portion 52 is provided at the center in the width direction of the radially inner surface of the engaging element 5. The shape of the output-side engaged portion 52 is not limited as long as it is configured to be able to engage with the output-side engaging portion 38.

[0114] In this example, the engaging element 5 has, on its radially inner surface, a flat surface portion 56 that is perpendicular to the radial direction of the engaging element 5, and the flat surface portion 56 has two protrusions 57 that protrude radially inward at two positions in the width direction of the engaging element 5. The output-side engaged portion 52 is formed by a portion of the flat surface portion 56 that is located between the two protrusions 57 in the width direction. Note that, in this example, the width dimension of the output-side engaged portion 52, i.e., the distance between the two protrusions 57, is larger than the width dimension of the flat surface 42 of the output-side engaging portion 38.

[0115] In the reverse input cutoff clutch 1 of this example, the pressing surfaces 50 of the two engaging elements 5 face radially opposite each other and the flat surface portions 56 face each other, and each engaging element 5 is arranged radially inside the movable element 8 so as to be movable in a first direction, which is the radial direction of each engaging element 5 and corresponds to the direction in which the pressing surfaces 50 move toward and away from the pressed surface 6. Furthermore, the two input-side engaging portions 31 of the input member 3 arranged on one axial side are axially inserted into the input-side engaged portions 51 of the two engaging elements 5, and the output-side engaging portion 38 of the output member 4 arranged on the other axial side is axially inserted between the output-side engaged portions 52 of the two engaging elements 5. In other words, the two engaging elements 5 are arranged so that the output-side engaging portion 38 is sandwiched from the radially outer side by the output-side engaged portions 52.

[0116] The inner diameter dimension of the movable element 8 and the radial dimension of the engaging element 5 are regulated so that when the two engaging elements 5 are positioned radially inside the movable element 8, there is a gap in at least one of the areas between the pressed surface 6 and the two pressing surfaces 50, and between the tip surfaces of each of the two combinations of protrusions 57 formed by the two protrusions 57 of the two engaging elements facing each other.

[0117] [Biasing member] The reverse input disconnecting clutch 1 of this example further includes a biasing member 58 as an optional component.

[0118] The biasing member 58 elastically biases the engaging element 5 in a direction to bring it closer to the pressed surface 6. The biasing member 58 can be made of a spring such as a leaf spring, a coil spring, or a disc spring, or an elastic material such as rubber, elastomer, or synthetic resin. The number of biasing members 58 is not particularly limited and is determined appropriately depending on the number of engaging elements 5.

[0119] In this example, the urging member 58 is composed of two urging members 58 arranged at two positions in the width direction between the radially inner surfaces of the two engaging members 5, and each urging member 58 is composed of a compression coil spring. A protrusion 57 is inserted into the inside of each urging member 58 at both ends in the extension direction. This prevents each urging member 58 from falling out from between the two engaging members 5.

[0120] The two biasing members 58 elastically bias the two engagement elements 5 in a direction that brings them closer to the pressed surface 6 by the force that elastically tries to restore them. As a result, in a neutral state where no torque is applied to either the input member 3 or the output member 4, the pressing surfaces 50 of the two engagement elements 5 come into contact with the pressed surface 6.

[0121] [Spacers and stopper components] Moreover, the reverse input disconnecting clutch 1 of this example further includes two spacers 59 and a stopper member 60 as optional components.

[0122] Each spacer 59 has the function of regulating the axial position of the engaging element 5 relative to the output member 4.

[0123] In this example, each spacer 59 is formed in a flat plate shape and has an end face shape that is generally oval or generally rectangular when viewed in the axial direction. Each spacer 59 has a through hole 61 through which the output side engaging portion 38 can be inserted without rattle. Each spacer 59 is arranged on both axial sides of the two engaging elements 5 with the output side engaging portion 38 inserted into the through hole 61 without rattle.

[0124] The stopper member 60 has a function of preventing the spacer 59 on one axial side of the two spacers 59 from moving to one axial side and falling off the output member 4.

[0125] In this example, the stopper member 60 is configured as a snap ring having a segmented annular shape. The stopper member 60 is engaged with the other axial end of the small diameter shaft portion 41.

[0126] <Explanation of reverse input cutoff clutch operation> The operation of the reverse input cutoff clutch 1 with the reverse input cutoff function enabled will be described with reference to Figures 5 and 6. Note that Figures 5 and 6 omit the biasing member 58 and exaggerate the radial gaps between the input member 3 and the output member 4 and the two engaging elements 5.

[0127] When a rotational torque is input to the input member 3, the two engaging elements 5 move in a direction away from the pressed surface 6, regardless of the rotational direction of the input member 3. More specifically, as shown in Fig. 5, the input side engaging portion 31 rotates inside the input side engaged portion 51 in the rotational direction of the input member 3 (counterclockwise in the example of Fig. 5).

[0128] This reduces the gap between the radial inner surface 34 of the input side engaging portion 31 and the radial inner surface 53 of the input side engaged portion 51, and brings the radial inner surface 34 or curved portion 37 of the input side engaging portion 31 into contact with the radial inner surface 53 of the input side engaged portion 51.

[0129] When the input member 3 rotates further from this state, the radially inner surface 34 or the curved surface 37 of the input-side engaging portion 31 presses the radially inner surface 53 of the input-side engaged portion 51 radially inward, and the engaging element 5 moves in a direction away from the pressed surface 6. In other words, the two engaging elements 5 move radially inward, that is, toward each other, based on their engagement with the input member 3, and the radially inner surfaces of the two engaging elements 5 approach each other, and the output-side engaging portion 38 of the output member 4 is sandwiched from both radial sides by the output-side engaged portions 52 of the two engaging elements 5.

[0130] In this way, while the output member 4 is rotated so that the flat surface 42 of the output-side engaging portion 38 is parallel to the flat surface portion 56 of the engaging element 5, the output-side engaging portion 38 and the output-side engaged portion 52 of the engaging element 5 are engaged without 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 is output from the output member 4.

[0131] When a rotational torque is input in reverse to the output member 4, the two engaging elements 5 move in a direction approaching the pressed surface 6, regardless of the rotational direction of the output member 4. More specifically, as shown in FIG. 6 , the output-side engaging portion 38 rotates in the rotational direction of the output member 4 (clockwise in the example of FIG. 6 ) inside the output-side engaged portions 52 of the two engaging elements 5. The output-side engaged portions 52 are pressed radially outward by the connection (corner) between the flat surface 42 and the convex curved surface 43 on the outer circumferential surface of the output-side engaging portion 38, and the two engaging elements 5 move in a direction approaching the pressed surface 6.

[0132] That is, based on engagement with the output member 4, the two engaging elements 5 move radially outward, that is, away from each other, and the pressing surfaces 50 of the two engaging elements 5 come into contact with the pressed surface 6 and frictionally engage with the pressed surface 6.

[0133] When the reverse input blocking function is enabled, torque transmission is possible between the movable element 8 and the fixed element 7 via the connecting member 9. In other words, when the reverse input blocking function is enabled, the movable element 8, which is able to transmit torque to the fixed element 7 via the connecting member 9, is unable to rotate. Therefore, when the pressing surfaces 50 of the two engaging members 5 frictionally engage with the pressed surfaces 6 of the movable element 8, the rotational torque reversely input to the output member 4 is completely blocked and not transmitted to the input member 3, or only a portion of the rotational torque reversely input to the output member 4 is transmitted to the input member 3, with the remainder blocked.

[0134] To completely block the rotational torque input in reverse to the output member 4 and prevent it from being transmitted to the input member 3, the engaging member 5 is stretched (clamped) between the output side engaging portion 38 and the movable element 8 so that the pressing surface 50 of the engaging member 5 does not slide (rotate relative to) against the pressed surface 6, and the output member 4 is locked.

[0135] In order to transmit only a portion of the rotational torque input inversely to the output member 4 to the input member 3 and block the remainder, the engaging member 5 is stretched (clamped) between the output side engaging portion 38 and the movable element 8 so that the pressing surface 50 of the engaging member 5 slides against the pressed surface 6, and the output member 4 is semi-locked.

[0136] In the reverse input cutoff clutch 1 of this example, the size of the gap between each component is adjusted to enable the above operation. In particular, when the pressing surfaces 50 of the two engaging elements 5 are in contact with the pressed surfaces 6, a gap is set to exist between the radially inner surface 34 of the input-side engaging portion 31 and the radially inner surface 53 of the input-side engaged portion 51.

[0137] This prevents the input side engaging portion 31 from blocking the radially outward movement of the engaging element 5 when a rotational torque is input in reverse to the output member 4, and also ensures that even after the pressing surface 50 comes into contact with the pressed surface 6, the surface pressure acting on the contact point between the pressing surface 50 and the pressed surface 6 changes depending on the magnitude of the rotational torque input in reverse to the output member 4, thereby ensuring that the output member 4 is locked or semi-locked properly.

[0138] According to the reverse input cutoff clutch 1 of this example, for the same reasons as the reverse input cutoff clutch described in WO 2019 / 026794, the axial dimension can be shortened and the number of parts can be reduced.

[0139] The reverse input cutoff clutch 1 of this example converts the rotation of each of the input member 3 and the output member 4 into radial movement of the engagement element 5. By converting the rotation of the input member 3 and the output member 4 into radial movement of the engagement element 5 in this way, the engagement element 5 is engaged with the output member 4 located radially inward of the engagement element 5, or the engagement element 5 is pressed against the movable element 8 located radially outward of the engagement element 5.

[0140] In this way, the reverse input disconnection clutch 1 of this example can switch between an unlocked state in which rotational torque can be transmitted from the input member 3 to the output member 4, and a locked state in which rotation of the output member 4 is prevented or a semi-locked state in which rotation of the output member 4 is suppressed, based on the radial movement of the engaging element 5 controlled by the rotation of the input member 3 and / or the output member 4, thereby shortening the axial dimension of the entire device of the reverse input disconnection clutch 1.

[0141] Moreover, the engaging element 5 has both the function of transmitting the rotational torque input to the input member 3 to the output member 4 and the function of locking or semi-locking the output member 4. This makes it possible to reduce the number of parts in the reverse input cutoff clutch 1, and also makes the operation more stable than when the function of transmitting rotational torque and the function of locking or semi-locking are provided in separate members.

[0142] For example, if the function of transmitting rotational torque and the function of locking or semi-locking are provided in separate members, there is a possibility that the timing of unlocking or semi-unlocking may differ from the timing of starting to transmit rotational torque. In this case, if rotational torque is reversely input to the output member between unlocking or semi-unlocking and starting to transmit rotational torque, the output member will be locked or semi-locked again.

[0143] In this example, the engagement element 5 has both the function of transmitting rotational torque to the output member 4 and the function of locking or semi-locking the output member 4, so that such inconvenience can be prevented.

[0144] Furthermore, since the direction of the force acting from the input member 3 to the engaging element 5 and the direction of the force acting from the output member 4 to the engaging element 5 are opposite, the movement direction of the engaging element 5 can be controlled by regulating the magnitude relationship between the two forces. This makes it possible to stably and reliably switch the output member 4 between the locked state or semi-locked state and the unlocked state.

[0145] <Explanation of how to enable / disable the reverse input blocking function> To disable the reverse input blocking function of the reverse input blocking clutch 1, the coupling member 9 is disengaged from at least one of the fixed element 7 and the movable element 8. In this example, a tool or the like is used to pull the coupling member 9 out of the fixed-side engaging portion 10 and the movable-side engaging portion 19. This disengages the coupling member 9 from both the fixed element 7 and the movable element 8, allowing relative rotation of the movable element 8 with respect to the fixed element 7. In other words, torque transmission between the movable element 8 and the fixed element 7 becomes impossible.

[0146] When the reverse input blocking function is disabled and relative rotation of the movable element 8 with respect to the fixed element 7 is permitted, and a rotational torque is reversely input to the output member 4, the two engaging elements 5 move toward the pressed surface 6 regardless of the rotation direction of the output member 4, and the pressing surface 50 of each engaging element 5 frictionally engages with the pressed surface 6. As a result, the output member 4, the two engaging elements 5, and the movable element 8 rotate integrally. Furthermore, as the two engaging elements 5 rotate, the radially inner surface 53 of the input-side engaged portion 51 presses the radially inner surface 34 or the curved surface 37 of the input-side engaging portion 31 in the circumferential direction, and the rotational torque is transmitted to the input member 3.

[0147] According to the reverse input cutoff clutch 1 of this example, even after the reverse input cutoff clutch 1 is incorporated into the torque transmission path of a mechanical device, the reverse input cutoff function can be disabled by disengaging the coupling member 9 from at least one of the fixed element 7 and the movable element 8. Therefore, even if, for example, a malfunction occurs in an input-side mechanism such as a drive source connected to the input member 3, making it impossible to input torque from the input member 3 to the reverse input cutoff clutch 1 and making it impossible to change the position or posture of the driven member connected to the output member 4, the reverse input cutoff function can be disabled to enable torque transmission from the output member 4 to the input member 3, i.e., by allowing the output member 4 to rotate due to the input of torque from the output member 4, the position or posture of the driven member can be changed by applying an external force to the driven member, thereby ensuring safety.

[0148] In addition, when a rotational torque is input to the input member 3 with the reverse input blocking function disabled, the rotational torque is basically transmitted to the output member 4 in the same manner as when the reverse input blocking function is enabled.

[0149] Specifically, when a rotational torque is input to the input member 3, the two engaging elements 5 move in a direction away from the pressed surface 6, regardless of the rotation direction of the input member 3. As a result, the radially inner surface 34 or the curved surface 37 of the input-side engaging portion 31 comes into contact with the radially inner surface 53 of the input-side engaged portion 51, and further, the radially inner surface 34 or the curved surface 37 of the input-side engaging portion 31 presses the radially inner surface 53 of the input-side engaged portion 51 radially inward, causing the engaging elements 5 to move in a direction away from the pressed surface 6. As a result, the output-side engaging portion 38 of the output member 4 is sandwiched from both radial sides by the output-side engaged portions 52 of the two engaging elements 5.

[0150] Then, while rotating the output member 4 so that the flat surface 42 of the output-side engaging portion 38 is parallel to the flat surface portion 56 of the engaging element 5, the output-side engaging portion 38 and the output-side engaged portion 52 of the engaging element 5 are engaged without 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 is output from the output member 4.

[0151] To switch the reverse input blocking function to effective, the coupling member 9 is again placed between the fixed element 7 and the movable element 8. In this example, the coupling member 9 is inserted between the fixed side engaging portion 10 and the movable side engaging portion 19 with the circumferential phases of the fixed side engaging portion 10 and the movable side engaging portion 19 aligned. This prevents the movable element 8 from rotating relative to the fixed element 7.

[0152] [Example 2] A second example of the embodiment of the present disclosure will be described with reference to FIG.

[0153] In this example, the structure of the pressed member 2a is different from the structure of the pressed member 2 in the first example. Specifically, the shape of the fixed-side engaging portion 10a provided on the fixed element 7a and the shape of the movable-side engaging portion 19a provided on the movable element 8a are different from the shapes of the fixed-side engaging portion 10 and the movable-side engaging portion 19 in the first example.

[0154] In this example, the fixed-side engaging portion 10a is formed to be in a twisted position with respect to the central axis O7 of the fixed element 7a and is composed of two holes 17a, 17b with circular cross-sectional shapes that are arranged coaxially with each other. That is, the fixed-side engaging portion 10a of this example does not have the groove portion 18 that was provided in the fixed-side engaging portion 10 of the first example.

[0155] In this example, the movable-side engagement portion 19a is formed at a skew position with respect to the central axis O8 of the movable element 8a and is configured as a movable-side engagement hole having a circular cross-sectional shape. The movable-side engagement portion 19a has an inner diameter approximately equal to the inner diameter of the holes 17a and 17b that constitute the fixed-side engagement portion 10a.

[0156] In this example, the pressed member 2a is aligned with the center axis O of the fixed side engaging portion 10a. 10 and the central axis O of the movable side engagement portion 19a 19 With these holes aligned, the connecting member 9 is engaged with the fixed-side engaging portion 10a and the movable-side engaging portion 19a. Specifically, both ends of the connecting member 9 in the extension direction are engaged with the holes 17a, 17b, and the middle portion of the connecting member 9 in the extension direction is engaged with the movable-side engaging portion 19a.

[0157] The configuration and effects of other parts of the second example are the same as those of the first example.

[0158] [Example 3] A third example of the embodiment of the present disclosure will be described with reference to FIG.

[0159] In this example, the structure of the pressed member 2b is different from the structure of the pressed member 2 in the first example. Specifically, the shape of the connecting member 9a and the shape of the fixed-side engaging portion 10b provided on the fixing element 7b are different from the shapes of the connecting member 9 and the fixed-side engaging portion 10 in the first example.

[0160] The connecting member 9a in this example is configured by a bolt having a male thread portion 63 on the outer circumferential surface. The connecting member 9a includes a head portion 64 and a shaft portion 65.

[0161] The head 64 has a shape that allows a tool to be engaged when fastening or loosening the fastening member 9a, which is a bolt, in the screw hole. In this example, the head 64 has a non-circular hole for inserting a tool such as a hex wrench. However, the outer shape of the head can also be non-circular so that it can be engaged with a wrench.

[0162] The shaft 65 has a large diameter portion 66 on the base end side (left side in FIG. 9) and a small diameter portion 67 on the tip end side (right side in FIG. 9). The male thread portion 63 is provided on the outer circumferential surface of the small diameter portion 67.

[0163] The large diameter portion 66 has a cylindrical outer circumferential surface whose outer diameter does not change in the extension direction.

[0164] Furthermore, the large diameter portion 66 has a dimension in the extension direction that is longer than the dimension in the extension direction of the movable side engaging portion 19. Therefore, a part of the large diameter portion 66 is adapted to engage with the fixed side engaging portion 10a.

[0165] The fixed side engaging portion 10b has two holes 17c and 17d provided on both sides in the extension direction, and a groove 18 provided in the middle portion in the extension direction.

[0166] One of the two holes 17c, 17d (the left side in FIG. 9) is a stepped circular hole. Specifically, the inner circumferential surface of the hole 17c has a large-diameter cylindrical surface portion 68 on the side (left side in FIG. 9) that opens to the outer circumferential surface of the fastening element 7b (thick-walled portion 16), a small-diameter cylindrical surface portion 69 on the side (right side in FIG. 9) that opens to the inner circumferential surface (small-diameter cylindrical surface portion 12) of the fastening element 7b, and a stepped surface 70 connecting the large-diameter cylindrical surface portion 68 and the small-diameter cylindrical surface portion 69. The large-diameter cylindrical surface portion 68 has an inner diameter larger than the outer diameter (circumscribed circle diameter) of the head portion 64 of the coupling member 9a. The small-diameter cylindrical surface portion 69 has an inner diameter smaller than the outer diameter of the head portion 64 and larger than the outer diameter of the large-diameter portion 66 of the shaft portion 65.

[0167] The other of the two holes 17c, 17d (the right-hand hole in FIG. 9) is a threaded hole having a female thread on its inner circumferential surface that screws together with the male thread 63 of the coupling member 9a.

[0168] The groove 18 has an arc-shaped cross section.

[0169] In this example, the male thread portion 63 provided on the outer peripheral surface of the small diameter portion 67 of the coupling member 9a is threaded into the female thread portion provided on the inner peripheral surface of the other hole portion 17d of the fixed-side engagement portion 10b, the base end of the large diameter portion 66 is inserted into the small diameter cylindrical surface portion 69 of one hole portion 17c, and the tip side portion of the large diameter portion 66 is positioned without rattle between the groove portion 18 and the movable-side engagement portion 19. In this state, the seat surface of the head portion 64 abuts against the step surface 70 of one hole portion 17c. This positions the coupling member 9a.

[0170] In the reverse input cutoff clutch of this example, to disable the reverse input cutoff function, a tool or the like is used to loosen the engagement between the male thread portion 63 provided on the outer peripheral surface of the small diameter portion 67 of the coupling member 9a and the female thread portion provided on the inner peripheral surface of the other hole portion 17d of the fixed side engagement portion 10b. Furthermore, the coupling member 9a is pulled out from the fixed side engagement portion 10b and the movable side engagement portion 19.

[0171] To effectively switch on the reverse input blocking function, coupling member 9a is inserted into one hole 17c and the portion between groove 18 and movable-side coupling portion 19 with the circumferential phases of fixed-side coupling portion 10b and movable-side coupling portion 19 aligned, and then a tool or the like is used to screw male thread 63 provided on the outer peripheral surface of small-diameter portion 67 of coupling member 9a into female thread provided on the inner peripheral surface of the other hole 17d of fixed-side coupling portion 10b. This prevents relative rotation of movable element 8 with respect to fixed element 7b.

[0172] The other configurations and effects of the third example are the same as those of the first example.

[0173] [Example 4] A fourth example of the embodiment of the present disclosure will be described with reference to FIGS. 10(A) and 10(B).

[0174] In the pressed member 2c of this example, the shape of the movable-side engaging portion 19b provided on the movable element 8b is changed from that of the movable-side engaging portion 19 of the third example. Specifically, the movable-side engaging portion 19b is configured with a flat surface.

[0175] The number of movable-side engaging portions 19b is determined in accordance with the number of connecting members 9a. That is, the movable element 8b is provided with movable-side engaging portions 19b in a number at least equal to the number of connecting members 9a.

[0176] In this example, the coupling member 9a is composed of two coupling members 9a. Therefore, the movable element 8b is provided with at least two movable-side engaging portions 19b. For example, the movable-side engaging portions 19b can be formed at two circumferential positions on the outer peripheral surface of the movable element 8b. Alternatively, the movable-side engaging portions 19b can be formed at three or more circumferential positions on the outer peripheral surface of the movable element 8b, and the coupling members 9b can be engaged with two of these movable-side engaging portions 19b.

[0177] In this example, the movable element 8b is provided with six movable-side engaging portions 19b. Therefore, the movable element 8b has a rectangular cylindrical surface portion 78 having a generally regular hexagonal external shape as viewed from the axial direction on the outer peripheral surface of the other axial end portion. Of the six movable-side engaging portions 19b, two movable-side engaging portions 19b located on diametrically opposite sides are engaged with an intermediate portion of the coupling member 9a in the extension direction. In other words, the outer peripheral surface of the tip-side portion of the large-diameter portion 66 of the shaft portion 65 faces each movable-side engaging portion 19b.

[0178] In the pressed member 2c of this example, the movable element 8b has six movable-side engaging portions 19b, two of which are adapted to engage with the connecting member 9a. This makes it easier to align the phases of the fixed-side engaging portions 10b and the movable-side engaging portions 19b in the circumferential direction compared to the structure of the second example.

[0179] Other configurations and effects of the fourth example are similar to those of the first and second examples.

[0180] [Example 5] A fifth example of the embodiment of the present disclosure will be described with reference to FIGS. 11(A) and 11(B).

[0181] In the pressed member 2d of this example, the shape of the connecting member 9b and the shape of the fixed-side engaging portion 10c provided on the fixing element 7c are changed from the shape of the connecting member 9a and the shape of the fixed-side engaging portion 10b of the fourth example.

[0182] In this example, the connecting member 9b is a pin, which is a columnar member having a substantially square cross section. The connecting member 9b has tapered portions 71a at both ends in the extension direction, the cross-sectional area of which decreases toward both sides in the extension direction.

[0183] The fixed-side engaging portion 10c is formed at a twisted position with respect to the central axis of the fixed element 7c and is configured as a fixed-side engaging hole having a substantially square cross-sectional shape. Specifically, the fixed-side engaging portion 10c has holes at both ends in the extension direction that open to the outer and inner peripheral surfaces (small-diameter cylindrical surface portion 12) of the thick-walled portion 16 and have a substantially square cross-sectional shape, and a groove at the middle portion in the extension direction that opens to the small-diameter cylindrical surface portion 12 and has a substantially rectangular cross-sectional shape.

[0184] In the pressed member 2d of this example, both sides of the connecting member 9b in the extension direction are pressed or lightly pressed into the hole of the fixed side engaging portion 10c, and the middle portion of the connecting member 9b in the extension direction is positioned without any play between the groove portion of the fixed side engaging portion 10c and the movable side engaging portion 19b.

[0185] The configuration and effects of other parts of the fifth example are the same as those of the first example and the second to fourth examples.

[0186] [Example 6] A sixth example of the embodiment of the present disclosure will be described with reference to FIG.

[0187] In the pressed member 2e of this example, the connecting member 9c is suspended in the radial direction between the fixed element 7d and the movable element 8c. Accordingly, the forming direction and shape of the fixed-side engaging portion 10d provided on the fixed element 7d and the forming direction and shape of the movable-side engaging portion 19c provided on the movable element 8c are changed.

[0188] In this example, the connecting member 9c is made up of two connecting members 9c.

[0189] Each of the connecting members 9c is made of a bolt having a male thread 63a on its outer circumferential surface, and includes a head 64a and a shaft 65a.

[0190] The shaft 65a has a large diameter portion 66a on the base end side and a small diameter portion 67a on the tip end side. The male thread portion 63a is provided on the outer circumferential surface of the small diameter portion 67a.

[0191] The fixed-side engaging portion 10d is configured as a fixed-side engaging hole that penetrates the fixed element 7d in the radial direction and has a stepped cylindrical inner circumferential surface. In this example, the fixed-side engaging portion 10d penetrates the thick-walled portion 16a of the fixed element 7d in the radial direction. The inner circumferential surface of the fixed-side engaging portion 10d has a large-diameter cylindrical surface portion 72 that opens to the outer circumferential surface of the fixed element 7d, a small-diameter cylindrical surface portion 73 that opens to the outer circumferential surface of the fixed element 7d, and a stepped surface 74 that connects the large-diameter cylindrical surface portion 72 and the small-diameter cylindrical surface portion 73 and faces radially outward.

[0192] In this example, the fixed-side engaging portion 10d is configured by two fixed-side engaging portions 10d, which correspond to the number of connecting members 9c. The two fixed-side engaging portions 10d are arranged at two locations on opposite radial sides of the thick-walled portion 16a.

[0193] The movable-side engaging portion 19c is configured as a stepped hole that opens to the outer peripheral surface of the movable element 8c and has a circular cross-sectional shape. The movable-side engaging portion 19c has a large-diameter portion 79 on the radially outer side and a small-diameter portion 80 on the radially inner side. The large-diameter portion 79 opens to the small-diameter cylindrical surface portion 24. The small diameter portion 80 has, on its inner peripheral surface, a female thread portion that screws into the male thread portion 63a of the coupling member 9c.

[0194] The movable-side engaging portion 19c is configured by two movable-side engaging portions 19c, corresponding to the number of connecting members 9c. The two movable-side engaging portions 19c are formed so as to open at two locations on opposite radial sides of the small-diameter cylindrical surface portion 24.

[0195] In this example, the male threads 63a provided on the outer peripheral surface of the small diameter portion 67a of each coupling member 9c are threadedly engaged with the female threads provided on the small diameter portion 80 of the movable-side engagement portion 19c, and the large diameter portion 68a is inserted through the large diameter portion 79 of the movable-side engagement portion 19c and the small diameter cylindrical surface portion 73 of the fixed-side engagement portion 10d. In this state, the seating surface of the head 64a abuts against the stepped surface 74. This positions the coupling member 9c.

[0196] The other configurations and effects of the sixth example are the same as those of the first example.

[0197] [Example 7] A seventh example of the embodiment of the present disclosure will be described with reference to FIG.

[0198] In the pressed member 2f of this example, the connecting member 9d is suspended between the fixed element 7e and the movable element 8d in a direction parallel to the axial direction, and accordingly, the forming direction and shape of the fixed-side engaging portion 10e provided on the fixed element 7e and the forming direction and shape of the movable-side engaging portion 19d provided on the movable element 8d are changed.

[0199] In this example, the connecting member 9d is made up of four connecting members 9d.

[0200] Each of the connecting members 9d is made of a bolt having a male thread 63b on its outer circumferential surface, and each of the connecting members 9d includes a head 64b and a shaft 65b.

[0201] The shaft portion 65b has a large diameter portion 66b on the base end side and a small diameter portion 67b on the tip end side. The male thread portion 63b is provided on the outer circumferential surface of the small diameter portion 67b.

[0202] The fixed side engaging portion 10e is configured as a fixed side engaging hole that penetrates the fixed element 7e in the axial direction and has a circular cross section.

[0203] In this example, the fixed-side engaging portion 10e is formed on a fixed flange portion 75 that protrudes radially inward from the other axial end of the inner circumferential surface of the thick portion 16a of the fixed element 7e.

[0204] In this example, the fixed-side engaging portions 10e are configured by four fixed-side engaging portions 10e, corresponding to the number of connecting members 9d. The four fixed-side engaging portions 10e are formed so as to penetrate the fixed flange portion 75 in the axial direction at four positions equally spaced apart in the circumferential direction.

[0205] The movable-side engaging portion 19d is configured as a movable-side engaging hole that opens into the end face on the other axial side of the movable element 8d. In this example, the movable-side engaging portion 19d is configured as a stepped, bottomed hole having a large-diameter portion 76 on the other axial side and a small-diameter portion 77 on one axial side. The small-diameter portion 77 has a female thread portion on its inner circumferential surface that screws into the male thread portion 63b of the connecting member 9d.

[0206] The movable-side engaging portions 19d are configured by four movable-side engaging portions 19d, corresponding to the number of connecting members 9d. The four movable-side engaging portions 19d are formed so as to open at four equally spaced locations in the circumferential direction on the end face on the other axial side of the movable element 8d.

[0207] In this example, the male threads 63b provided on the outer peripheral surface of the small diameter portion 67b of each coupling member 9d are threadedly engaged with the female threads provided on the inner peripheral surface of the small diameter portion 77 of the movable-side engagement portion 19d, and the large diameter portion 68b is inserted through the fixed-side engagement portion 10e and the small diameter portion 77 of the movable-side engagement portion 19d. In this state, the seating surface of the head 64b abuts against the side surface on the other axial side of the fixed flange portion 75. This positions the coupling member 9d.

[0208] The configuration and effects of other parts of the seventh example are the same as those of the first example.

[0209] The first to seventh embodiments of the present disclosure may be combined as appropriate, provided that no contradictions arise. The scope of the present disclosure also encompasses improvements and modifications that can be made by those skilled in the art based on the contents of the present disclosure, as long as the coupling member can be engaged or disengaged to switch between permitting and preventing differential rotation of the movable element relative to the fixed element. For example, a flange extending radially outward may be provided at the axial end of the movable element, and the fixed element and the flange may be engaged in the axial direction, with an engaging member spanning between the fixed-side engaging portion provided on the fixed element and the movable-side engaging portion provided on the flange. In this case, the fixed-side engaging portion and the movable-side engaging portion may be formed on the outer circumferential surface of the fixed element and the outer circumferential surface of the flange. [Explanation of symbols]

[0210] 1 Reverse input cutoff clutch 2, 2a, 2b, 2c, 2d, 2e, 2f Pressed member 3 Input member 4 Output member 5 Engagement element 6 Pressed surface 7, 7a, 7b, 7c, 7d, 7e Fixed element 8, 8a, 8b, 8c, 8d Moving elements 9, 9a, 9b, 9c, 9d Connecting members 10, 10a, 10b, 10c, 10d, 10e Fixed side engagement part 11 Large diameter cylindrical surface 12 Small diameter cylindrical surface part 13 Connection surface 14 Locking groove 15 Thin-walled section 16, 16a Thick wall part 17a, 17b, 17c, 17d holes 18 Groove 19, 19a, 19b, 19c, 19d Movable side engagement part 20 Large diameter cylindrical surface 21 Small diameter cylindrical surface part 22 Connection surface 23 Large diameter cylindrical surface 24 Small diameter cylindrical surface section 25 Connection surface 26 Inward flange 27 Rolling bearings 28 outer ring 29 Inner circle 30 rolling elements 31 Input side engagement portion 32 Input shaft 33 Input flange 34 Radial inner surface 35 Radial outer surface 36 Circumferential side 37 Curved part 38 Output side engagement portion 39 Output shaft 40 Output flange 41 Small diameter shaft 42 Flat surface 43 Convex curved surface 44 Radial Rolling Bearing 45 outer ring 46a, 46b retaining ring 47 Inner Circle 48 rolling elements 49 Plain bearings 50 Pressing surface 51 Input side engaged portion 52 Output side engaged part 53 Radial inner surface 54 Radial outer surface 55 Circumferential side 56 Flat surface part 57 Convex part 58 biasing member 59 Spacer 60 Stopper member 61 Through hole 62 Retaining ring 63, 63a Male thread 64, 64a head 65, 65a shaft part 66, 66a Large diameter section 67, 67a Small diameter section 68 Large diameter cylindrical surface 69 Small diameter cylindrical surface part 70 Step surface 71, 71a Tapered section 72 Large diameter cylindrical surface 73 Small diameter cylindrical surface part 74 Step surface 75 Fixed flange 76 Large diameter section 77 Small diameter section 78 Square cylindrical surface part 79 Large diameter section 80 Small diameter section

Claims

1. a pressed member having a pressed surface on its inner circumferential surface; an input member having an input-side engaging portion disposed radially inside the pressed surface and disposed coaxially with the pressed surface; an output member having an output side engaging portion disposed radially inward of the input side engaging portion on the radially inner side of the pressed surface, the output member being disposed coaxially with the pressed surface; an engaging element having a pressing surface facing the pressed surface, an input side engaged portion engageable with the input side engaging portion, and an output side engaged portion engageable with the output side engaging portion, the engaging element being disposed radially inward of the pressed surface so as to be movable in a first direction which is a direction toward or away from the pressed surface; When a rotational torque is input to the input member, the engaging element is displaced so as to move away from the pressed surface based on the engagement between the input side engaging portion and the input side engaged portion, thereby engaging the output side engaged portion with the output side engaging portion, thereby transmitting the rotational torque input to the input member to the output member, and when a rotational torque is input in reverse to the output member, the output side engaging portion is engaged with the output side engaged portion, thereby pressing the pressing surface against the pressed surface and frictionally engaging the pressing surface with the pressed surface, The pressed member is A fixed element that does not rotate during use; a movable element supported radially inside the fixed element so as to be rotatable relative to the fixed element, the movable element having the pressed surface; a coupling member that is stretched across the fixed element and the movable element and that can be engaged with and disengaged from at least one of the fixed element and the movable element; and By engaging the coupling member with the fixed element and the movable element, the movable element is prevented from rotating relative to the fixed element, whereas by disengaging the coupling member from at least one of the fixed element and the movable element, the movable element is allowed to rotate relative to the fixed element. Reverse input cut-off clutch.

2. The pressed member has a rolling bearing disposed between the fixed element and the movable element.

2. The reverse input disconnecting clutch according to claim 1.

3. The fixing element has a fixing side engagement portion, The movable element has a movable-side engagement portion, the connecting member is formed of a columnar member or a cylindrical member, a part of the connecting member in the extending direction is engaged with the fixed-side engaging portion, and the remaining part of the connecting member in the extending direction is engaged with the movable-side engaging portion; 2. The reverse input disconnecting clutch according to claim 1.

4. the connecting member is configured by a bolt having, on its outer circumferential surface, a male thread portion that screws into a female thread portion provided on the fixed-side engaging portion or the movable-side engaging portion, 4. The reverse input disconnecting clutch according to claim 3.

5. The fixed-side engaging portion is configured by a fixed-side engaging hole formed to be at a twisted position with respect to a central axis of the fixed element, Both side portions of the connecting member in the extension direction are engaged with the fixed-side engaging holes, and an intermediate portion of the connecting member in the extension direction is engaged with the movable-side engaging portion.

4. The reverse input disconnecting clutch according to claim 3.

6. The movable-side engaging portion is configured by a recessed groove formed on the outer circumferential surface of the movable element.

4. The reverse input disconnecting clutch according to claim 3.

7. The movable engaging portion is configured by a flat surface.

4. The reverse input disconnecting clutch according to claim 3.

8. The fixed-side engaging portion is configured by a fixed-side engaging hole that penetrates in the radial direction, The movable-side engaging portion is configured as a movable-side engaging hole that opens on the outer peripheral surface.

4. The reverse input disconnecting clutch according to claim 3.

9. The fixed-side engaging portion is configured by a fixed-side engaging hole that penetrates in the axial direction, The movable-side engaging portion is configured as a movable-side engaging hole that opens in the axial direction.

4. The reverse input disconnecting clutch according to claim 3.

10. a biasing member that elastically biases the engaging element in a direction toward the pressed surface; The reverse input disconnecting clutch according to any one of claims 1 to 9.

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