Reverse input cutoff clutch

Abstract

This realizes a structure that can switch between enabling and disabling a reverse input rotation lock function that locks the rotation of the output member when a rotational torque is reverse input to the output member. The output member 4 has a first element 33 having an output-side engaging portion 29, a second element 34 having a torque output portion 30, arranged coaxially with the first element 33, and supported so as to be rotatable relative to the first element 33, and a coupling member that spans the first element 33 and the second element 34 so as to be engageable with and disengageable from at least one of the first element 33 and the second element 34.

Description

[Technical Field]

[0001] The present disclosure relates to a reverse input cutoff clutch that transmits rotational torque input to an input member to an output member, while completely cutting off rotational torque that is reversely input to the output member, so that it is not transmitted to the input member, or that transmits only a portion of the torque to the input member and cuts off 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 differ in the mechanism for cutting off the rotational torque reversely input to the output member. There are two types of reverse input cutoff clutches: a locking type reverse input cutoff clutch equipped with a mechanism for preventing the output member from rotating when rotational torque is reversely input to the output member, and a free type reverse input cutoff clutch equipped with a mechanism for causing the output member to spin freely when rotational torque is input to the output member. Whether to use a locking type 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] In the locking reverse input cut-off clutch described in WO 2019 / 026794, when rotational torque is input to an input member, the input-side engaging portion of the input member engages with the input-side engaged portion of an engager, causing the engager to move in a direction away from a pressed surface provided on a pressing member and engage the output-side engaged portion of the engager with the output-side engaging portion of an output member, 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 of the engager against the pressed surface, causing the pressing surface to frictionally engage with the pressed surface. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2019 / 026794 Brochure Summary of the Invention [Problem to be solved by the invention]

[0006] 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.

[0007] The present disclosure aims to realize a reverse input blocking clutch structure that can switch between enabling and disabling a reverse input rotation lock function that locks the rotation of an output member when rotational torque is reverse input to the output member. [Means for solving the problem]

[0008] A reverse input disconnecting clutch according to one aspect of the present disclosure includes an input member and an output member.

[0009] The output member has a torque output portion and is disposed coaxially with the input member.

[0010] The output member is a first element; and a second element having the torque output portion and arranged coaxially with the first element; a coupling member that is stretched across the radial direction between the first element and the second element so as to be capable of being engaged with and disengaged from at least one of the first element and the second element; It has.

[0011] The output member prevents the second element from rotating relative to the first element by engaging the connecting member with the first element and the second element, whereas the output member allows the second element to rotate relative to the first element by disengaging the connecting member from at least one of the first element and the second element.

[0012] In one embodiment of the reverse input cut-off clutch of the present disclosure, when a rotational torque is input to the input member while the connecting member is engaged with the first element and the second element, the reverse input cut-off clutch transmits the rotational torque input to the input member to the output member, whereas when a rotational torque is input in reverse to the torque output section, the reverse input torque to the torque output section is not transmitted to the input member, or a portion of the torque is transmitted to the input member and the remainder is cut off.

[0013] In a reverse input cutoff clutch according to one aspect of the present disclosure, one of the first element and the second element includes a fitting shaft portion having an inner diameter side engagement hole opening at at least one location on its outer peripheral surface, and the other of the first element and the second element includes a fitting tubular portion having at least one outer diameter side engagement hole passing through in the radial direction and fitted onto the fitting shaft portion. In this case, a portion of the coupling member in the extending direction engages with the inner diameter side engagement hole, and another portion of the coupling member in the extending direction engages with the outer diameter side engagement hole.

[0014] In a reverse input cutoff clutch according to one aspect of the present disclosure, the inner diameter side engagement hole is formed so as to radially penetrate the fitting shaft portion, and the at least one outer diameter side engagement hole is composed of two outer diameter side engagement holes provided at two radially opposite positions on the fitting cylindrical portion. In this case, a middle portion of the connecting member in the extension direction engages with the inner diameter side engagement hole, and both side portions of the connecting member in the extension direction engage with the two outer diameter side engagement holes.

[0015] In one embodiment of the reverse input cutoff clutch of the present disclosure, one of the two outer diameter side engagement holes is configured as a threaded hole, and the connecting member is configured as a reamer bolt.

[0016] In the reverse input cutoff clutch according to one aspect of the present disclosure, the coupling member is configured by a knock pin press-fitted into the inner diameter side engagement hole and / or the at least one outer diameter side engagement hole.

[0017] The reverse input cutoff clutch of one aspect of the present disclosure further includes a pressed member having a pressed surface on its inner circumferential surface, and an engaging element arranged radially inward of the pressed surface so as to be able to move radially.

[0018] The input member has an input-side engaging portion disposed radially inside the pressed surface, and is disposed coaxially with the pressed surface.

[0019] The first element has an output-side engaging portion that is disposed radially inward of the input-side engaging portion on the radially inner side of the pressed surface.

[0020] 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.

[0021] When a rotational torque is input to the input member while the connecting member is engaged with the first element and the second element, the engaging element is displaced 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, 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, thereby pressing the pressing surface against the pressed surface and frictionally engaging the pressing surface with the pressed surface. [Effects of the Invention]

[0022] According to the reverse input cutoff clutch of one aspect of the present disclosure, when rotational torque is reversely input to the output member, the reverse input rotation lock function that locks the rotation of the output member can be switched between enabled and disabled. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a cross-sectional view showing a reverse input cutoff clutch according to a first example of an embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 1, showing a state in which a rotational torque is input to the input member, with the biasing member omitted. [Figure 4] 4 is a cross-sectional view taken along the line AA in FIG. 1, showing a state in which a rotational torque is reversely input to the output member, with the biasing member omitted. [Figure 5]FIG. 5 is a cross-sectional view showing a reverse input cutoff clutch according to a second example of an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0024] [Example 1] A first example of an embodiment of the present disclosure will be described with reference to FIGS. 1 to 4. FIG.

[0025] In the following description, unless otherwise specified, the axial direction, radial direction, and circumferential direction refer to the axial direction, radial direction, and circumferential direction of the reverse input disconnection clutch 1. In this example, the axial direction, radial direction, and circumferential direction of the reverse input disconnection clutch 1 coincide with the axial direction, radial direction, and circumferential direction of the input member 3, coincide with the axial direction, radial direction, and circumferential direction of the pressed surface 6, and coincide with the axial direction, radial direction, and circumferential direction of the output member 4. Furthermore, one axial side refers to the input member 3 side (the right side in FIG. 1), and the other axial side refers to the output member 4 side (the left side in FIG. 1).

[0026] The direction toward or away from the pressing surface 52 of the engaging element 5 relative to the pressed surface 6 is defined as the first direction (the up-down direction in Figs. 2 to 4), and the direction perpendicular to both the axial direction of the pressed surface 6 and the first direction is defined as the second direction (the left-right direction in Figs. 2 to 4). With respect to the engaging element, the direction coinciding with the first direction is defined as its radial direction (the direction indicated by arrow α in Fig. 2), and the direction coinciding with the second direction is defined as its width direction (the direction indicated by arrow β in Fig. 2).

[0027] <Explanation of the structure of the reverse input cutoff clutch> The reverse input cutoff clutch 1 includes an input member 3 and an output member 4 that has a torque output portion 30 and is disposed coaxially with the input member 3.

[0028] The output member 4 comprises a first element 33, a second element 34 having a torque output section 30 and arranged coaxially with the first element 33, and a connecting member 35 radially stretched between the first element 33 and the second element 34 so as to be able to engage and disengage with at least one of the first element 33 and the second element 34.

[0029] The output member 4 prevents the second element 34 from rotating relative to the first element 33 by engaging the connecting member 35 with the first element 33 and the second element 34, and allows the second element 34 to rotate relative to the first element 33 by disengaging the connecting member 35 from at least one of the first element 33 and the second element 34.

[0030] When rotational torque is input to the input member 3 with the coupling member 35 engaged with the first element 33 and the second element 34, the reverse input cut-off clutch 1 transmits the torque input to the input member 3 to the output member, whereas when rotational torque is input in reverse to the torque output section 30, the torque input in reverse to the torque output section 30 is not transmitted to the input member 3, or only a portion of it is transmitted to the input member 3 and the remainder is cut off.

[0031] In the reverse input cutoff clutch 1, when the coupling member 35 engages with the first element 33 and the second element 34 and the second element 34 is unable to rotate relative to the first element 33, if a rotational torque is reverse input to the torque output unit 30, the reverse input rotation lock function is switched to active, which either does not transmit the torque reversely input to the torque output unit 30 to the input member 3, or transmits a portion of the torque to the input member 3 and blocks the remainder. On the other hand, when the coupling member 35 is disengaged from at least one of the first element 33 and the second element 34 and the second element 34 is allowed to rotate relative to the first element 33, the reverse input rotation lock function is switched to inactive.

[0032] In the normal use state of the reverse input cutoff clutch 1 after it is installed in the middle of the torque transmission path of a mechanical device, the coupling member 35 is engaged across both the first element 33 and the second element 34. In this state, the output member 4 has its reverse input rotation lock function active.

[0033] In contrast, if a malfunction occurs in the mechanical device, the coupling member 35 can be disengaged by pulling it out of at least one of the first element 33 and the second element 34 using any means, such as a tool, to disengage the coupling member 35 from at least one of the first element 33 and the second element 34. This disables the reverse input locking function of the reverse input disconnection clutch 1, allowing relative rotation of the second element 34 with respect to the first element 33. In other words, the second element 34 can spin freely. This allows the position, attitude, etc. of the driven member connected to the torque output portion 30 of the second element 34 so that torque can be transmitted thereto to be changed.

[0034] As long as the configuration of the reverse input cut-off clutch 1 can realize the above-mentioned functions, it is not limited to the specific structure of the reverse input cut-off clutch 1 of this example described below, and can be widely applied to reverse input cut-off clutches having any structure.

[0035] The reverse input cutoff clutch 1 of this example is configured as a locking type reverse input cutoff clutch. In addition to an input member 3 and an output member 4, the reverse input cutoff clutch 1 also includes a pressed member 2 and an engaging element 5. The output member 4 of the reverse input cutoff clutch 1 has a first element 33, a second element 34, and a connecting member 35, so that the reverse input rotation lock function can be switched between enabled and disabled.

[0036] When the reverse input rotation lock function of the reverse input cutoff clutch 1 is active, and rotational torque is input to the input member 3, the engaging element 5 is displaced away from the pressed surface 6 based on the engagement between the input side engaging portion 20 of the input member 3 and the input side engaged portion 53, and the output side engaged portion 54 is engaged with the output side engaging portion 29 of the output member 4, thereby transmitting the rotational torque input to the input member 3 to the output member 4. In contrast, when rotational torque is input in reverse to the output member 4, the engaging element 5 presses the pressing surface 52 against the pressed surface 6 by engaging the output side engaging portion 29 with the output side engaged portion 54, and the pressing surface 52 is frictionally engaged with the pressed surface 6.

[0037] When the reverse input rotation lock function of the reverse input cutoff clutch 1 is disabled, the second element 34 of the output member 4 rotates freely relative to the first element 33. In other words, torque is not transmitted between the input member 3 and the output member 4.

[0038] [Pressure target] The pressed member 2 has a pressed surface 6 on its inner circumferential surface. The pressed surface 6 faces the pressing surface 52 of the engaging element 5, and has the function of preventing or restricting rotation of the engaging element 5 by frictionally engaging with the pressing surface 52 of the engaging element 5 when the engaging element 5 moves in a direction approaching the pressed surface 6 in the first direction. The input-side engaging portion 20 of the input member 3, the output-side engaging portion 29 of the output member 4, and the engaging element 5 are arranged radially inward of the pressed surface 6.

[0039] The pressed member 2 is supported and fixed to a fixed part such as a housing that does not rotate even when in use, and its rotation is restricted, or it is constituted by the fixed part. In other words, the pressed member 2 does not rotate even when in use. In this example, the pressed member 2 is supported and fixed to the fixed part, and its rotation is restricted.

[0040] The pressed surface 6 has an annular shape when viewed in the axial direction. The pressed surface 6 can be configured as a cylindrical surface whose inner diameter does not change in the axial direction, or can be configured as a cylindrical surface whose inner diameter changes in the axial direction. In this example, the pressed surface 6 is configured as a cylindrical surface whose inner diameter does not change in the axial direction.

[0041] The structure of the pressed member 2 is not limited as long as it has a pressed surface 6 on its inner circumferential surface. The pressed member 2 can be formed of a single part, or can be formed by combining multiple parts. The structure for arranging, supporting, and functioning the input member 3 and / or the output member 4 can be provided in the fixed part separately from the pressed member 2, or can be provided in the pressed member 2.

[0042] In this example, the pressed member 2 includes an input element 7 and an output element 8.

[0043] The input element 7 has a stepped cylindrical shape. Specifically, the input element 7 includes a small-diameter cylindrical portion 9 on one axial side, a large-diameter cylindrical portion 10 on the other axial side, and a connecting portion 11 connecting the small-diameter cylindrical portion 9 and the large-diameter cylindrical portion 10. In this example, the inner peripheral surface of the large-diameter cylindrical portion 10 forms the pressed surface 6.

[0044] The input side element 7 has an inward flange portion 12 that protrudes radially inward at one axial end of the small diameter cylindrical portion 9, and has outward flange portions 13 that protrude radially outward at multiple locations circumferentially at the other axial end of the large diameter cylindrical portion 10.

[0045] Output element 8 has a stepped cylindrical shape. Specifically, output element 8 includes a large-diameter cylindrical portion 14 on one axial side, a small-diameter cylindrical portion 15 on the other axial side, and a connecting portion 16 connecting large-diameter cylindrical portion 14 and small-diameter cylindrical portion 15. Output element 8 also includes an inward flange portion 17 that protrudes radially inward at the end of small-diameter cylindrical portion 15 on the other axial side, and through-holes 18 that penetrate large-diameter cylindrical portion 14 in the axial direction at multiple locations around the circumference.

[0046] In this example, the input element 7 and the output element 8 are fitted together (spigot fitting) without any rattle, and in this state the input element 7 and the output element 8 are positioned radially, and then a bolt 19 is inserted through a mounting hole provided so as to pass through the outward flange portion 13 of the input element 7 in the axial direction and screwed into a threaded hole opening on one axial side surface of the large-diameter cylindrical portion 14 of the output element 8, thereby forming the pressed member 2. The pressed member 2 is supported and fixed to the fixed part by screwing a bolt inserted through a through hole 18 of the output element 8 into a threaded hole provided in the fixed part.

[0047] [Input member] The input member 3 has an input-side engagement portion 20 arranged radially inside the pressed surface 6, and is arranged coaxially with the pressed surface 6. The input member 3 is connected to an input-side mechanism such as a drive source, and rotational torque is input to the input member 3. The input member 3 may be configured as an output shaft of the input-side mechanism, or the input member 3 may be configured as a separate member from the output shaft and fixed coaxially to the output shaft. Additionally, the input shaft portion 21 provided on the input member 3 may be rotatably supported relative to the fixed portion.

[0048] In this example, the input member 3 is configured as a separate member from the output shaft and includes a cylindrical input shaft portion 21, which is coaxially fixed to the tip end of the output shaft of the input-side mechanism. In this example, the input member 3 further includes an input flange portion 22 extending radially outward from the other axial end of the input shaft portion 21.

[0049] The input-side engaging portion 20 is provided at a portion radially outwardly deviated from the rotation center O of the input member 3, and has a portion that engages with the input-side engaged portion 53 of the engager 5. The input-side engaging portion 20 is configured so that its radially inner surface 23 engages with, or more specifically comes into contact with, the radially inner surface 55 of the input-side engaged portion 53 as the input member 3 or the engager 5 rotates. In this example, the input-side engaging portion 20 is provided so as to protrude toward the other axial side from a portion of the end face on the other axial side of the input flange portion 22 that is radially outwardly deviated from the rotation center axis O.

[0050] The shape of the input side engaging portion 20 is not limited as long as it is configured to engage with the input side engaged portion 53 of the engaging element 5.

[0051] For example, the input-side engaging portion 20 may have an end face shape that is symmetrical with respect to the circumferential direction, or may have an end face shape that is asymmetrical with respect to the circumferential direction. In this example, the input-side engaging portion 20 has an end face shape that is symmetrical with respect to the circumferential direction.

[0052] For example, the input-side engaging portion 20 may have an end face shape similar to a partial ring shape, a substantially trapezoidal shape, or a shape whose circumferential width increases radially outward when viewed from the axial direction. In this example, the circumferential middle portion of the radially inner surface 23 of the input-side engaging portion 20 is formed by a flat surface perpendicular to the line connecting the rotation axis O and the center of the input-side engaging portion 20 when viewed from the axial direction, and the circumferential side portions are formed by a partial cylindrical convex surface that slopes radially outward toward both circumferential sides. The radially outer surface 24 of the input-side engaging portion 20 is formed by a partial cylindrical convex surface centered on the rotation axis O.

[0053] The number of input side engaging portions 20 is determined according to the number of engaging elements 5, and when the engaging elements 5 are composed of a plurality of engaging elements 5, the input side engaging portion 20 is also composed of a plurality of input side engaging portions 20. In this example, the engaging elements 5 are composed of two engaging elements 5. Therefore, the input side engaging portion 20 is composed of two input side engaging portions 20 to match the number of engaging elements 5. The two input side engaging portions 20 are arranged at two radially opposite positions on the side surface on the other axial side of the input flange portion 22, and are spaced apart from each other in the radial direction of the input member 3.

[0054] The input member 3 is rotatably supported by the fixed portion or the pressed member 2 supported and fixed to the fixed portion. In this example, the input member 3 is rotatably supported radially inside the input element 7 of the pressed member 2 by a radial rolling bearing 25. The radial rolling bearing 25 includes an outer ring 26, an inner ring 27, and a plurality of rolling elements 28.

[0055] The outer ring 26 is fitted into the small-diameter cylindrical portion 9 without any rattle, and one end face of the outer ring 26 in the axial direction abuts against the side face of the inward flange portion 12 on the other axial side.

[0056] The inner ring 27 is fitted onto the other axial end of the input shaft portion 21 without any rattle, and the other axial end face thereof abuts against the side surface of the input flange portion 22 on one axial side.

[0057] A plurality of rolling elements 28 are arranged to roll freely between the outer ring 26 and the inner ring 27. Each of the rolling elements 28 is made up of a ball, a cylindrical roller, or a tapered roller. In this example, each of the rolling elements 28 is made up of a ball.

[0058] [Output member] The output member 4 has an output-side engaging portion 29 arranged radially inward of the input-side engaging portion 20 on the radial inner side of the pressed surface 6, and a torque output portion 30, and is arranged coaxially with the pressed surface 6. The output member 4 is also arranged coaxially with the input member 3 on the radial inner side of the pressed surface 6.

[0059] The output side engaging portion 29 has a portion that can engage with the output side engaged portion 54 of the engaging element 5, and this engageable portion is located radially inward of the input side engaging portion 20 and radially outward from the central axis O of the output member 4, and is arranged at a position where it can engage with the output side engaged portion 54 of the engaging element 5. The output side engaging portion 29 is configured so that this portion engages with, or more specifically comes into contact with, the output side engaged portion 54 as the output member 4 or the engaging element 5 rotates.

[0060] The shape of the output side engaging portion 29 is not limited as long as it has a portion that can engage with the output side engaged portion 54 of the engaging element 5.

[0061] The output-side engaging portion 29 has a cam function. That is, the distance from the rotational center axis O of the output member 4 to the outer circumferential surface of the output-side engaging portion 29, which is the portion that engages with the output-side engaged portion 54, is not constant in the circumferential direction.

[0062] The number of portions of the output side engaging portion 29 that engage with the output side engaged portions 54 is determined according to the number of engaging elements 5, and when the engaging elements 5 are composed of a plurality of engaging elements 5, the output side engaging portion 29 is also configured to have a plurality of the engaging portions. In this example, the output side engaging portion 29 is configured to have portions that engage with two of the output side engaged portions 54, in accordance with the number of engaging elements 5. However, even when the number of engaging elements 5 is one, it is possible to adopt a structure similar to this example.

[0063] The cross-sectional shape of the output side engaging portion 29 when cut along an imaginary plane perpendicular to the rotation center axis O of the output member 4 can be any shape as long as the output side engaging portion 29 has a cam function, and can be, for example, a quadrangle such as a square, rectangle, parallelogram, or trapezoid, an oval, or a shape similar to these quadrangles or ovals.

[0064] 2, the output-side engaging portion 29 has a substantially rectangular cross-sectional shape when cut along an imaginary plane perpendicular to the central axis O of rotation of the output member 4. More specifically, the outer circumferential surface of the output-side engaging portion 29 is composed of two parallel flat surfaces 31 and two partially cylindrical convex surfaces 32.

[0065] In this example, the output-side engaging portion 29 is plane-symmetrical with respect to an imaginary plane that passes through the rotational center axis O of the output member 4 and is perpendicular to the two flat surfaces 31. Furthermore, the output-side engaging portion 29 is plane-symmetrical with respect to an imaginary plane that passes through the rotational center axis O of the output member 4 and is parallel to the two flat surfaces 31. In other words, the output-side engaging portion 29 has a shape that is two-fold symmetrical with respect to the central axis of the output member 4. The output-side engaging portion 29 is disposed radially inward of the two input-side engaging portions 20 and between the output-side engaged portions 54 of the two engaging elements 5.

[0066] The torque output unit 30 is a part for transmitting torque to the input shaft of an output-side mechanism such as a reduction gear. The torque output unit 30 can be configured, for example, by a fitting portion, such as a spline portion (male spline portion or female spline portion), a serration portion (male serration portion or female serration portion), or a key engagement portion (key or key groove), for fitting the input shaft so as to prevent relative rotation. Alternatively, the torque output unit 30 can be configured by torque transmission elements, such as a gear that meshes with a gear provided on the input shaft, a sprocket through which a chain is passed between the sprocket provided on the input shaft and the torque output unit 30, or a pulley through which a pulley is passed between the sprocket provided on the input shaft and the torque output unit 30. When the torque output unit 30 is configured by a torque transmission element, the torque transmission element may be formed directly on the output member 4, or the torque transmission element may be configured as a separate member from the other portions of the output member 4 and fixed coaxially to the output member 4. In this example, the torque output unit 30 is configured by a gear directly formed on the outer circumferential surface of the output member 4.

[0067] The output member 4 has a first element 33 having an output side engaging portion 29, a second element 34 having a torque output portion 30 and arranged coaxially with the first element 33, and a connecting member 35 stretched radially between the first element 33 and the second element 34 so as to be able to engage and disengage with at least one of the first element 33 and the second element 34.

[0068] The second element 34 can be rotatably supported on the fixed part or on the pressed member 2 supported and fixed to the fixed part. In this case, the second element 34 can have, on its outer circumferential surface, a bearing fitting surface 37 onto which a radial bearing 36 is fitted. However, if the second element 34 is fitted to the input shaft so as not to rotate relative to it, it can also be rotatably supported on the fixed part via the input shaft.

[0069] The first element 33 can be rotatably supported separately from the second element 34 on the fixed portion or the pressed member 2 supported and fixed to the fixed portion. Alternatively, with the coupling member 35 spanning both the first element 33 and the second element 34, the first element 33 is rotatably supported on the fixed portion or the pressed member 2 supported and fixed to the fixed portion via the second element 34 and the radial bearing 36, or the first element 33 is rotatably supported on the fixed portion via the second element 34 and the input shaft.

[0070] The configuration of the engagement portion between the first element 33 and the second element 34 and the connecting member 35 in the reverse input disconnection clutch 1 is not particularly limited as long as the connecting member 35 can be engaged and disengaged with at least one of the first element 33 and the second element 34.

[0071] One of the first element 33 and the second element 34 can have a mating shaft portion 38, and the other of the first element 33 and the second element 34 can have a mating cylindrical portion 39 that is fitted onto the outside of the mating shaft portion 38, in other words, that rotatably fits the mating shaft portion 38 inside.

[0072] The fitting shaft portion 38 may have an inner diameter side engagement hole 40 that opens at least at one location on the outer peripheral surface. Specifically, the inner diameter side engagement hole 40 may be a bottomed hole that opens at only one location on the outer peripheral surface, or a through hole that penetrates the outer peripheral surface in the radial direction. The fitting cylindrical portion 39 may have at least one outer diameter side engagement hole 41 that penetrates in the radial direction. In this case, the coupling member 35 spans between the inner diameter side engagement hole 40 and the outer diameter side engagement hole 41.

[0073] Furthermore, the inner diameter side engagement hole 40 can be configured as a through hole formed so as to penetrate the fitting shaft portion 38 in the radial direction, and the outer diameter side engagement hole 41 can be configured as two outer diameter side engagement holes 41 formed at two radially opposite positions on the fitting cylindrical portion 39. The connecting member 35 has both side portions in the extension direction that engage with the two outer diameter side engagement holes 41, and an intermediate portion in the extension direction that engages with the inner diameter side engagement hole 40.

[0074] In this example, the fitting shaft portion 38 provided on the first element 33 and the fitting cylindrical portion 39 provided on the second element 34 are fitted together without any radial rattle. Below, the configurations of the first element 33, the second element 34, and the coupling member 35 in this example will be described in detail, but the present disclosure is not limited thereto.

[0075] (first element) The first element 33 has an output shaft portion 42 in addition to the output side engagement portion 29 .

[0076] The output shaft portion 42 has a stepped cylindrical shape. Specifically, the output shaft portion 42 has a large diameter portion 43 on one axial side and a small diameter portion 44 on the other axial side. The outer circumferential surfaces of the large diameter portion 43 and the small diameter portion 44 are connected by a stepped surface 45 facing the other axial side. The output side engaging portion 29 protrudes from the center of the end face on one axial side of the large diameter portion 43 toward the one axial side. In this example, the fitting shaft portion 38 is provided on the other axial side portion of the small diameter portion 44.

[0077] The first element 33 has an inner diameter side engagement hole 40 that is a first engagement portion with which a part of the coupling member 35 is engaged and that opens at least at one location on the outer circumferential surface of the fitting shaft portion 38.

[0078] In this example, the inner diameter side engagement hole 40 is configured as a through hole formed so as to penetrate radially through the fitting shaft portion 38. An axially intermediate portion of the coupling member 35 is engaged with the inner diameter side engagement hole 40, specifically, is press-fitted or fitted in without any radial play.

[0079] In this example, the first element 33 is rotatably supported radially inside the output element 8 of the pressed member 2. For this purpose, the first element 33 has, on its outer circumferential surface, a bearing fitting surface 47 onto which a radial bearing 46 is fitted. Specifically, the bearing fitting surface 47 is provided on the outer circumferential surface of the small diameter portion 44 at one axial end.

[0080] The radial bearing 46 includes an outer ring 48 , an inner ring 49 , and a plurality of rolling elements 50 .

[0081] The outer ring 48 is fitted securely into the small diameter cylindrical portion 15 of the output element 8, and the end face on the other axial side thereof abuts against the side face on one axial side of the inward flange portion 17.

[0082] The inner ring 49 is fitted onto the bearing fitting surface portion 47 without any rattle, and one end face in the axial direction of the inner ring 49 abuts against the stepped surface 45 .

[0083] A plurality of rolling elements 50 are arranged to roll freely between the outer ring 48 and the inner ring 49. Each of the rolling elements 50 is made up of a ball, a cylindrical roller, or a tapered roller. In this example, each of the rolling elements 50 is made up of a ball.

[0084] (Second element) The second element 34 has a torque output portion 30, is disposed coaxially with the first element 33, and is supported so as to be capable of relative rotation with respect to the first element 33.

[0085] In this example, the second element 34 has a fitting tubular portion 39 that is fitted onto the fitting shaft portion 38 without any radial rattle and so as to be rotatable relative to the fitting shaft portion 38. Furthermore, in addition to the fitting tubular portion 39, the second element 34 has a bottom portion 51 that closes the other axial end of the fitting tubular portion 39. However, the bottom portion 51 may be omitted.

[0086] The second element 34 is a second engagement portion with which another portion of the coupling member 35 engages, and has at least one outer diameter side engagement hole 41 that penetrates radially through the fitting cylindrical portion 39. In this example, the at least one outer diameter side engagement hole 41 is configured by two outer diameter side engagement holes 41 provided at two radially opposite positions of the fitting cylindrical portion 39. The two outer diameter side engagement holes 41 are coaxially arranged on one axial side of the fitting cylindrical portion 39 and have the same inner diameter. Both axial ends of the coupling member 35 are engaged with the two outer diameter side engagement holes 41, specifically, are press-fitted or fitted in without radial play.

[0087] The torque output portion 30 is provided on the outer peripheral surface of the axially intermediate portion of the second element 34. In this example, the torque output portion 30 is configured by a gear.

[0088] In this example, the second element 34 is rotatably supported by the fixed portion by a radial bearing 36. In this example, a bearing fitting surface 37 onto which the radial bearing 36 is fitted is provided at the other axial end of the second element 34. The radial bearing 36 includes an outer ring 72 fitted into the fixed portion, an inner ring 73 fitted onto the bearing fitting surface 37 without any radial play, and a plurality of rolling elements 74 arranged to roll freely between the outer ring 72 and the inner ring 73. Each of the rolling elements 74 is composed of a ball, a cylindrical roller, or a tapered roller. In this example, each of the rolling elements 74 is composed of a ball.

[0089] (Connecting member) The material and structure of the connecting member 35 are arbitrary as long as it can prevent relative rotation between the first element 33 and the second element 34. The material that can be used to form the connecting member 35 includes metal materials such as iron-based alloys and light alloys, as well as synthetic resins.

[0090] The connecting member 35 can be formed of a columnar or cylindrical member. Specifically, the connecting member 35 can be formed of a pin such as a knock pin, split pin, or spring pin, or a bolt such as a reamer bolt, hex bolt, or cap bolt. In this case, a portion of the connecting member 35 in the extending direction engages with a first engaging portion provided on the first element 33, and another portion of the connecting member 35 in the extending direction engages with a second engaging portion provided on the second material.

[0091] The cross-sectional shape of the coupling member 35 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 first engagement portion (inner diameter side engagement hole 40) provided in the first element 33 and the second engagement portion (outer diameter side engagement hole 41) provided in the second element 34 be determined according to the cross-sectional shape of the coupling member 35.

[0092] In this example, the connecting member 35 is a knock pin made of a metal material. More specifically, the connecting member 35 is a parallel pin whose outer diameter does not change in the axial direction, except for the ends on both sides in the extension direction.

[0093] The coupling member 35 is press-fitted into at least one of the inner diameter side engagement hole 40 and the two outer diameter side engagement holes 41, and is press-fitted or fitted into the remaining engagement holes without any radial rattle. In this example, both end portions of the coupling member 35 in the extension direction are press-fitted or lightly press-fitted into the two outer diameter side engagement holes 41, and an intermediate portion of the coupling member 35 in the extension direction is inserted into the inner diameter side engagement hole 40, specifically, fitted into the inner diameter side engagement hole 40 without any rattle. The fitting strength of both end portions of the coupling member 35 in the extension direction with the two outer diameter side engagement holes 41 is large enough to prevent the coupling member 35 from falling off from the outer diameter side engagement hole 41 due to vibrations associated with operation of a mechanical device in which the reverse input cutoff clutch 1 is incorporated, and to allow the coupling member 35 to be pulled out of the outer diameter side engagement hole 41 by applying an axial force to the coupling member 35 when it is necessary to allow relative rotation of the second element 34 with respect to the first element 33.

[0094] The dimension of the coupling member 35 in the extension direction is not particularly limited as long as it can engage with the inner diameter side engagement hole 40 and the two outer diameter side engagement holes 41. Specifically, the dimension of the coupling member 35 in the extension direction can be the same as the outer diameter of the fitting cylindrical portion 39 of the second element 34, or it can be longer or shorter than the outer diameter of the fitting cylindrical portion 39. In this example, the dimension of the coupling member 35 in the extension direction is approximately the same as the outer diameter of the fitting cylindrical portion 39. Therefore, when the coupling member 35 is engaged with the inner diameter side engagement hole 40 and the two outer diameter side engagement holes 41, the ends on both sides of the coupling member 35 in the extension direction do not protrude from the outer peripheral surface of the fitting cylindrical portion 39.

[0095] [Engager] The engaging element 5 has a pressing surface 52 facing the pressed surface 6, an input side engaged portion 53 engageable with the input side engaging portion 20, and an output side engaged portion 54 engageable with the output side engaging portion 29, and is arranged so as to be able to move radially.

[0096] When a rotational torque is input to the input member 3 with the connecting member 35 spanning the first element 33 and the second element 34, the engaging element 5 moves in the first direction away from the pressed surface 6 based on the input side engaging portion 20 engaging with the input side engaged portion 53, and transmits the rotational torque input to the input member 3 to the output member 4 by engaging the output side engaged portion 54 with the output side engaging portion 29. Conversely, when a rotational torque is input in the reverse direction to the output member 4, the output side engaging portion 29 engages with the output side engaged portion 54, and presses the pressing surface 52 against the pressed surface 6, causing the pressing surface 52 to frictionally engage with the pressed surface 6.

[0097] 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.

[0098] 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. 2). The configuration of each engaging element 5 will be described below.

[0099] In this example, the radial direction with respect to the engaging element 5 is the direction of approach and distance of the pressing surface 52 relative to the pressed surface 6, and corresponds to the direction indicated by arrow α in Fig. 2. The width direction with respect to the engaging element 5 is the direction perpendicular to both the direction of approach and distance of the pressing surface 52 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. 2. 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.

[0100] The pressing surface 52 is provided on the radially outer surface of the engaging element 5 facing the pressed surface 6. In this example, the pressing surface 52 is composed of two pressing surfaces 52 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 52 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.

[0101] 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 52 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 52. In other words, when the two pressing surfaces 52 are in contact with the pressed surface 6, the portion that is circumferentially offset from the two pressing surfaces 52 does not come into contact with the pressed surface 6.

[0102] The pressing surface 52 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 52 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.

[0103] In this example, the input-side engaged portion 53 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 53 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 at the widthwise center position of the engaging element 5.

[0104] The input-side engaged portion 53 has a size that allows the input-side engaging portion 20 to be loosely inserted therein. Therefore, with the input-side engaging portion 20 inserted inside the input-side engaged portion 53, there is a gap between the input-side engaging portion 20 and the inner surface of the input-side engaged portion 53 in both the width direction and the radial direction of the engaging element 5. Therefore, the input-side engaging portion 20 can be displaced relative to the input-side engaged portion 53 in the rotational direction of the input member 3, and the input-side engaged portion 53 can be displaced relative to the input-side engaging portion 20 in the radial direction of the engaging element 5.

[0105] The shape of the input side engaged portion 53 is not limited as long as it is configured to be able to engage with the input side engaging portion 20 .

[0106] In this example, of the inner surfaces of the input-side engaged portion 53, a radially inner surface 55 facing radially outward is configured by a flat surface perpendicular to the first direction, and a radially outer surface 56 facing radially inward is configured by 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. A circumferential side surface 57 connecting both ends of the radially inner surface 55 on the second direction and both ends of the radially outer surface 56 on the second direction is configured by a concave curved surface having a partial cylindrical surface shape.

[0107] In this example, the output-side engaged portion 54 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 54 is not limited as long as it is configured to be able to engage with the output-side engaging portion 29.

[0108] In this example, the engaging element 5 has, on its radially inner surface, a flat surface portion 58 that is perpendicular to the radial direction of the engaging element 5, and the flat surface portion 58 has two protrusions 59 that protrude radially inward at two positions in the width direction of the engaging element 5. The output-side engaged portion 54 is formed by a portion of the flat surface portion 58 that is located between the two protrusions 59 in the width direction. Note that in this example, the width dimension of the output-side engaged portion 54, i.e., the distance between the two protrusions 59, is larger than the width dimension of the flat surface 31 of the output-side engaging portion 29.

[0109] In the reverse input cutoff clutch 1 of this example, the pressing surfaces 52 of the two engaging elements 5 face radially opposite each other, and the flat surface portions 58 face each other. Each engaging element 5 is arranged radially inside the input element 7 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 52 move toward and away from the pressed surface 6. Furthermore, the two input-side engaging portions 20 of the input member 3 arranged on one axial side are axially inserted into the input-side engaged portions 53 of the two engaging elements 5, and the output-side engaging portion 29 of the output member 4 arranged on the other axial side is axially inserted between the output-side engaged portions 54 of the two engaging elements 5. In other words, the two engaging elements 5 are arranged so that the output-side engaging portion 29 is sandwiched from the radially outer side by the output-side engaged portions 54.

[0110] The inner diameter dimension of the input side element 7 and the radial dimension of the engaging element 5 are regulated so that when the two engaging elements 5 are positioned radially inside the input side element 7, there is a gap in at least one of the areas between the pressed surface 6 and the two pressing surfaces 52, and between the tip surfaces of each of the two combinations of convex portions 59 formed by the two convex portions 59 of the two engaging elements facing each other.

[0111] [Biasing member] The reverse input disconnecting clutch 1 of this example further includes a biasing member 60 as an optional component.

[0112] The biasing member 60 elastically biases the engaging element 5 in a direction to bring it closer to the pressed surface 6. The biasing member 60 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 60 is not particularly limited and is determined appropriately depending on the number of engaging elements 5.

[0113] In this example, the urging member 60 is composed of two urging members 60 arranged at two positions in the width direction between the radially inner surfaces of the two engaging members 5, and each urging member 60 is composed of a compression coil spring. A protrusion 59 is inserted into the inside of each urging member 60 at both ends in the extension direction. This prevents each urging member 60 from falling off from between the two engaging members 5.

[0114] The two biasing members 60 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 52 of the two engagement elements 5 are in contact with the pressed surface 6.

[0115] <Explanation of reverse input cutoff clutch operation> The operation of the reverse input cutoff clutch 1 with the reverse input rotation lock function enabled will be described with reference to Figures 3 and 4. Note that Figures 3 and 4 omit the biasing member 60 and exaggerate the radial gaps between the input member 3 and the output member 4 and the two engaging elements 5.

[0116] 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. 3, the input side engaging portion 20 rotates inside the input side engaged portion 53 in the rotational direction of the input member 3 (counterclockwise in the example of Fig. 3).

[0117] This reduces the gap between the radial inner surface 23 of the input side engaging portion 20 and the radial inner surface 55 of the input side engaged portion 53, and brings the radial inner surface 23 of the input side engaging portion 20 into contact with the radial inner surface 55 of the input side engaged portion 53.

[0118] When the input member 3 rotates further from this state, the radially inner surface 23 of the input-side engaging portion 20 presses the radially inner surface 55 of the input-side engaged portion 53 radially inward, causing the engaging element 5 to move in a direction away from the pressed surface 6. That is, based on engagement with the input member 3, the two engaging elements 5 move radially inward, that is, in a direction toward each other, and the radially inner surfaces of the two engaging elements 5 approach each other, and the output-side engaged portions 54 of the two engaging elements 5 clamp the output-side engaging portion 29 of the first element 33 from both radial sides.

[0119] In this way, while rotating the first element 33 so that the flat surface 31 of the output-side engaging portion 29 is parallel to the flat surface portion 58 of the engaging element 5, the output-side engaging portion 29 and the output-side engaged portion 54 of the engaging element 5 are engaged without any rattle. As a result, the rotational torque input to the input member 3 is transmitted via the two engaging elements 5 and the first element 33 to the second element 34, which is connected and fixed to the first element 33 by the connecting member 35, and is then output from the torque output portion 30.

[0120] When a rotational torque is input in reverse to the second element 34 of 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 second element 34. More specifically, as the second element 34 and the first element 33 rotate integrally, the output-side engaging portion 29 rotates in the rotational direction of the second element 34 (clockwise in the example of FIG. 4 ) inside the output-side engaged portions 54 of the two engaging elements 5, as shown in FIG. 4 . The output-side engaged portions 54 are pressed radially outward by the connection (corner) between the flat surface 31 and the convex curved surface 32 on the outer circumferential surface of the output-side engaging portion 29, and the two engaging elements 5 move in a direction approaching the pressed surface 6.

[0121] That is, based on engagement with the first element 33, the two engaging elements 5 move radially outward, that is, away from each other, and the pressing surfaces 52 of the two engaging elements 5 come into contact with the pressed surface 6 and frictionally engage with the pressed surface 6.

[0122] When the reverse input rotation lock function is enabled, torque can be transmitted between the second element 34 and the first element 33 via the connecting member 35. In other words, when the reverse input rotation lock function is enabled, the first element 33 is unable to rotate relative to the second element 34. Therefore, when the pressing surfaces 52 of the two engaging members 5 frictionally engage with the pressed surfaces 6, the rotational torque reversely input to the second element 34 is completely blocked and not transmitted to the input member 3, or only a portion of the rotational torque reversely input to the second element 34 is transmitted to the input member 3 and the remainder is blocked. When the rotational torque reversely input to the second element 34 is completely blocked, the rotation of the second element 34 is locked, and the position and posture of the driven member cannot be changed.

[0123] To completely block the rotational torque input inversely to the second element 34 of the output member 4 and prevent it from being transmitted to the input member 3, the engaging element 5 is stretched (clamped) between the output side engaging portion 29 and the input side element 7 so that the pressing surface 52 of the engaging element 5 does not slide (rotate relative to) against the pressed surface 6, and the output member 4 is locked.

[0124] In order to transmit only a portion of the rotational torque reversely input to the second element 34 of the output member 4 to the input member 3 and block the remainder, the engaging element 5 is stretched (clamped) between the output side engaging portion 29 and the pressed member 2 so that the pressing surface 52 of the engaging element 5 slides against the pressed surface 6, and the output member 4 is semi-locked.

[0125] 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 52 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 23 of the input-side engaging portion 20 and the radially inner surface 55 of the input-side engaged portion 53.

[0126] This prevents the input side engagement portion 20 from blocking the radial outward movement of the engagement element 5 when a rotational torque is input in reverse to the output member 4, and also ensures that even after the pressing surface 52 comes into contact with the pressed surface 6, the surface pressure acting on the contact point between the pressing surface 52 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 appropriately.

[0127] In this example, the engaging element 5 is elastically biased radially outward by the biasing member 60. This allows the pressing surface 52 of the engaging element 5 to be kept in contact with the pressed surface 6 except when rotational torque is input to the input member 3. Therefore, when rotational torque is reversely input to the output member 4, the surface pressure at the contact portion between the pressing surface 52 of the engaging element 5 and the pressed surface 6 is quickly increased, and the reverse input cutoff clutch 1 is switched to a locked or half-locked state, i.e., good locking performance is ensured.

[0128] <Explanation of how to enable / disable the reverse input rotation lock function> The reverse input rotation lock function of the reverse input blocking clutch 1 can be switched between enabled and disabled by using a tool or the like to engage or disengage the coupling member 35 with at least one of the first element 33 and the second element 34.

[0129] In this example, when switching the reverse input rotation lock function of the reverse input cutoff clutch 1 from enabled to disabled, the coupling member 35 is pulled out from the inner diameter side engagement hole 40 and the two outer diameter side engagement holes 41 using a tool or the like. This disengages the coupling member 35 from both the first element 33 and the second element 34, thereby allowing relative rotation of the second element 34 with respect to the first element 33. In other words, torque transmission between the second element 34 and the first element 33 becomes impossible.

[0130] When the reverse input rotation lock function is disabled, the second element 34 is permitted to rotate relative to the first element 33. In other words, when the reverse input rotation lock function is disabled, the second element 34 rotates freely relative to the first element 33. Therefore, the torque input in reverse from the torque output unit 30 to the second element 34 is not transmitted to the first element 33, nor is it transmitted to the input member 3.

[0131] 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 rotation lock function can be disabled by disengaging the coupling member 35 from at least one of the first element 33 and the second element 34. 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 attitude of the driven member connected to the output member 4, the reverse input rotation lock function can be disabled and the second element 34 can be allowed to rotate relative to the first element 33, thereby applying an external force to the driven member to change the position or attitude of the driven member, thereby ensuring safety.

[0132] In the reverse input cutoff clutch 1 of this example, when the reverse input rotation lock function is disabled and rotational torque is input to the input member 3, the first element 33 rotates freely relative to the second element 34, and therefore, unlike when the reverse input rotation lock function is enabled, the rotational torque is not transmitted to the input shaft via the output member 4.

[0133] To switch the reverse input rotation lock function to valid, the coupling member 35 is again placed between the first element 33 and the second element 34. In this example, the coupling member 35 is inserted into the inner diameter side engagement hole 40 and the two outer diameter side engagement holes 41 with the circumferential phases of the inner diameter side engagement hole 40 and the two outer diameter side engagement holes 41 aligned. This prevents the second element 34 from rotating relative to the first element 33.

[0134] [Example 2] A second example of the embodiment of the present disclosure will be described with reference to FIG.

[0135] In this example, the connecting member 35a spanning the first element 33a and the second element 34a is configured by a reamer bolt. Specifically, the connecting member 35a has a shaft 61 and a head 62 provided at the base end of the shaft 61 (the upper end in FIG. 5).

[0136] The shaft portion 61 is provided with a body portion 63 disposed on the base end side and having an outer diameter that does not change in the extension direction, and a threaded shaft portion 64 disposed on the tip end side. The threaded shaft portion 64 has a male thread portion on the outer circumferential surface.

[0137] The head 62 has an engagement hole 65 having a non-circular opening shape such as a hexagon.

[0138] The output shaft portion 42a of the first element 33a has, in order from the other axial side, a small diameter portion 44a, a medium diameter portion 66, and a large diameter portion 43a. The output side engagement portion 29 protrudes toward one axial side from the center of the end face on one axial side of the large diameter portion 43a. In this example, the fitting shaft portion 38 is formed by the small diameter portion 44a. The inner diameter side engagement hole 40 is formed so as to radially penetrate an axial intermediate portion of the small diameter portion 44a (fitting shaft portion 38). A bearing fitting surface portion 47 onto which the radial bearing 46 is externally fitted is provided on the outer peripheral surface of one axial side portion of the medium diameter portion 66.

[0139] In this example, the two outer diameter side engagement holes 41a, 41b are provided at two radially opposite positions on one axial end of the fitting cylindrical portion 39a of the second element 34a. The two outer diameter side engagement holes 41a, 41b are arranged coaxially with each other.

[0140] The outer diameter side engagement hole 41a (lower in FIG. 5) of the two outer diameter side engagement holes 41a, 41b has a small diameter portion 67 arranged on the outer diameter side and a large diameter portion 68 arranged on the inner diameter side and having an inner diameter larger than the inner diameter of the small diameter portion 67. The small diameter portion 67 has a female thread portion on its inner circumferential surface.

[0141] The other of the two outer diameter side engagement holes 41a, 41b (upper in FIG. 5) has a large diameter portion 69 located on the outer diameter side and a small diameter portion 70 located on the inner diameter side and having an inner diameter smaller than the inner diameter of the large diameter portion 69. The inner circumferential surfaces of the large diameter portion 69 and the small diameter portion 70 are connected by a seating surface 71 facing radially outward.

[0142] In this example, the male threaded portion provided on the outer peripheral surface of the threaded shaft portion 64 of the coupling member 35a is threadedly engaged with the female threaded portion provided on the inner peripheral surface of the small diameter portion 67 of one outer diameter side engagement hole 41a, and the body portion 63 is inserted through the large diameter portion 68 of one outer diameter side engagement hole 41a, the inner diameter side engagement hole 40, and the small diameter portion 70 of the other outer diameter side engagement hole 41b, specifically, is fitted therein without any rattle. In this state, the neck bottom (seat surface) of the head 62 of the coupling member 35a abuts or closely faces the seat surface 71, and the head 62 is disposed inside the other outer diameter side engagement hole 41b.

[0143] In this example, to switch the reverse input rotation lock function from enabled to disabled, a tool such as a hex wrench is engaged with the engagement hole 65 to disengage the male threaded portion on the outer peripheral surface of the threaded shaft portion 64 of the coupling member 35a from the female threaded portion on the inner peripheral surface of the small diameter portion 67 of one of the outer diameter side engagement holes 41a, and the coupling member 35a is pulled out from the inner diameter side engagement hole 40 and the two outer diameter side engagement holes 41a, 41b. This allows relative rotation of the second element 34a with respect to the first element 33a. In other words, torque transmission between the second element 34a and the first element 33a is disabled.

[0144] To switch the reverse input rotation lock function into effect, the male threaded portion on the outer peripheral surface of the threaded shaft portion 64 is again threadedly engaged with the female threaded portion on the inner peripheral surface of the small diameter portion 67 of one of the outer diameter side engagement holes 41a, and the body portion 63 is inserted through the large diameter portion 68 of one of the outer diameter side engagement holes 41a, the inner diameter side engagement hole 40, and the small diameter portion 70 of the other outer diameter side engagement hole 41b. This prevents relative rotation of the second element 34a with respect to the first element 33a.

[0145] The other configurations and effects of the second example are the same as those of the first example. [Explanation of symbols]

[0146] 1 Reverse input cutoff clutch 2. Pressurized member 3 Input member 4, 4a Output member 5 Engagement element 6 Pressed surface 7 Input side element 8 Output element 9 Small diameter cylinder part 10 Large diameter cylindrical section 11 Connection 12 Inward flange 13 Outward flange 14 Large diameter cylinder 15 Small diameter cylinder part 16 Connection 17 Inward flange 18 Through hole 19 volts 20 Input side engagement portion 21 Input shaft 22 Input flange 23 Radial inner surface 24 Radial outer surface 25 Radial rolling bearing 26 Outer ring 27 Inner Circle 28 rolling elements 29 Output side engagement portion 30 Torque output section 31 Flat surface 32 Convex curved surface 33, 33a First element 34, 34a Second element 35, 35a connecting member 36 Radial bearing 37 Bearing mating surface 38 Mating shaft 39, 39a Fitting cylinder part 40 Inner diameter side engagement hole 41, 41a, 41b Outer diameter side engagement hole 42, 42a Output shaft 43, 43a Large diameter part 44, 44a Small diameter section 45 Step surface 46 Radial bearing 47 Bearing mating surface 48 outer ring 49 Inner Circle 50 rolling elements 51 Bottom 52 Pressing surface 53 Input side engaged portion 54 Output side engaged part 55 Radial inner surface 56 Radial outer surface 57 Circumferential side 58 Flat surface section 59 Convex part 60 biasing member 61 Shaft 62 Head 63 Torso 64 Screw shaft 65 Engagement hole 66 Medium diameter section 67 Small diameter section 68 Large diameter section 69 Large diameter section 70 Small diameter section 71 Seating surface 72 outer ring 73 Inner circle 74 rolling elements

Claims

1. Input component and An output member having a torque output section and arranged coaxially with the input member, Equipped with, The output member is The first component and, A second element having the torque output section and arranged coaxially with the first element, A coupling member is provided that allows engagement and disengagement with at least one of the first element and the second element, and is provided that spans radially between the first element and the second element. It has, By engaging the coupling member with the first element and the second element, relative rotation of the second element with respect to the first element is prevented, whereas by detaching the coupling member from at least one of the first element and the second element, relative rotation of the second element with respect to the first element is permitted. With the coupling member engaged with the first element and the second element, when rotational torque is input to the input member, the rotational torque input to the input member is transmitted to the output member. Conversely, when rotational torque is input in reverse to the torque output unit, the torque input in reverse to the torque output unit is not transmitted to the input member, or a portion of it is transmitted to the input member and the remainder is blocked. Reverse input blocking clutch.

2. One of the first element and the second element is provided with a fitting shaft portion having an inner diameter side engagement hole that opens at least at one location on its outer circumferential surface. The other of the first and second elements has at least one outer diameter engagement hole that penetrates in the radial direction, and comprises a fitting cylinder portion that is fitted onto the fitting shaft portion. A portion of the connecting member in the extension direction engages with the inner diameter side engagement hole, and the other portion of the connecting member in the extension direction engages with the at least one outer diameter side engagement hole. The reverse input interruption clutch according to claim 1.

3. The inner diameter engagement hole is formed to penetrate the fitting shaft portion radially, The aforementioned at least one outer diameter engagement hole is composed of two outer diameter engagement holes provided at two locations on the radially opposite sides of the fitting cylinder portion. The intermediate portion of the connecting member in the extension direction engages with the inner diameter side engagement hole, and both sides of the connecting member in the extension direction engage with the two outer diameter side engagement holes. The reverse input blocking clutch according to claim 2.

4. One of the two outer diameter engagement holes is configured as a screw hole. The aforementioned connecting member is made of a reamer bolt. The reverse input interruption clutch according to claim 3.

5. The connecting member is composed of a knock pin press-fitted into the inner diameter engagement hole and / or the at least one outer diameter engagement hole. The reverse input blocking clutch according to claim 2.

6. The device further comprises a pressed member having a pressed surface on its inner circumferential surface, and an engaging element arranged radially inward from the pressed surface so as to be movable in the radial direction, The input member has an input-side engaging portion located radially inward of the pressed surface and is arranged coaxially with the pressed surface. The first element has an output-side engaging portion that is located radially inward of the input-side engaging portion on the radially inward side of the pressed surface, The aforementioned engaging element is It has a pressing surface facing the pressed surface, an input-side engaged portion that can engage with the input-side engaging portion, and an output-side engaged portion that can engage with the output-side engaging portion, When the coupling member is engaged with the first element and the second element, and rotational torque is input to the input member, it is displaced 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 and transmitting the rotational torque input to the input member to the output member. Conversely, when rotational torque is input in reverse to the output member, the output-side engaging portion engages with the output-side engaged portion, pressing the pressing surface against the pressed surface and frictionally engaging the pressing surface with the pressed surface. A reverse input interruption clutch according to any one of claims 1 to 5.

Images