One-way clutch

Abstract

The invention provides a one-way clutch capable of facilitating installation work and reducing installation load. Specifically, the one-way clutch is configured such that an inner ring-side unit (110), in which a clutch mechanism (115), which holds a plurality of cams (116), is attached to an inner ring (111), is provided with a holding section (150) for receiving an elastic fastening member (160). And a plurality of cams (116) swingably held by the spacer ring (120) in a state in which the cams (116) are biased by the biasing means (130) so as to rotate in the engagement direction, and an elastic fastening member (160) that, during assembly, fits over the clutch mechanism (115) so as to hold the cams (116) in a posture in which the cams (116) are tilted in the engagement release direction. The inner ring-side unit (110) and the outer ring (140) can be detached from the clutch mechanism (115) by the relative movement of the inner ring-side unit (110) and the outer ring (140).

Description

Technical Field

[0001] This invention relates to a one-way clutch. Background Technology

[0002] Currently, for example, in inclined conveyors or bucket elevators used to transport objects from bottom to top, a one-way clutch is appropriately used to prevent reverse movement due to the weight of the object being transported.

[0003] If reference Figure 9 To illustrate, on the inclined conveyor 170, a one-way clutch 100a for preventing reverse rotation is installed at one end of the intermediate shaft of the reducer 171, thereby preventing the intermediate shaft from reversing. Furthermore, a one-way clutch 100b for overrunning is installed at the other end of the intermediate shaft of the reducer 171, thereby cutting off the reverse input to the auxiliary motor 176 via the intermediate shaft when driven by the main motor 174 connected to the input shaft of the reducer 171. The one-way clutch 100a for preventing reverse rotation and the one-way clutch 100b for overrunning can, for example, be clutches with the same configuration. Figure 9 The symbol 175 in the text refers to the part installed on the output shaft of the reducer 171 and on the downstream side. Figure 9 The belt conveyor in the middle (bottom side) is tilted. The hollow arrow indicates the direction of transport of the items being moved.

[0004] A one-way clutch, used to prevent the rotation shaft from reversing and to cut off the reverse input to the auxiliary motor 176, is configured to include: an inner ring and an outer ring, configured to rotate relative to each other on the same axis; and a clutch mechanism disposed between the outer ring and the inner ring. The clutch mechanism includes: a spacer ring, configured to rotate with the inner ring or the outer ring between the outer ring and the inner ring; a plurality of cams, pivotally supported in the spacer ring; and a force-applying unit that applies force to each of the plurality of cams in the engagement direction so as to contact the inner ring and the outer ring (see, for example, Patent Document 1).

[0005] exist Figure 9 On the inclined conveyor 170 shown, the overrunning one-way clutch 100b, for example, has an inner ring side unit with an assembled clutch mechanism mounted on the inner ring mounted on the intermediate shaft of the reducer 171, and an outer ring mounted on the motor shaft of the auxiliary motor 176. Then, with the inner ring side unit aligned with the outer ring shaft, the outer ring is mounted on the inner ring side unit by sliding the auxiliary motor 176 axially relative to the reducer 171.

[0006] As described above, since the force-applying unit applies force to the cam by oscillating in the meshing direction, when the inner ring side unit is aligned with the outer ring axis, such as Figure 14As shown, a portion of the cam 116 protrudes radially outward from the outer ring track surface 141. Therefore, when mounting the outer ring 140 onto the inner ring side unit 110, to ensure that the maximum outer diameter of the inner ring side unit 110 is smaller than the inner diameter of the outer ring 140, the height of the cam 116 relative to the radial direction must be reduced. Here, the maximum outer diameter of the inner ring side unit 110 refers to the maximum spacing between the parallel lines when the inner ring side unit 110 is clamped by two parallel lines in a top view. Figure 14 In the diagram, 111 is the inner ring, 120 is the spacer ring, and 130 is the force-adding unit.

[0007] As the first method, such as Figure 15A As shown, it is possible to consider rotating either or both of the outer ring 140 and the inner ring side unit 110 about the rotation axis O in the free-running direction of the one-way clutch while sliding axially, and then as... Figure 15B As shown, the cam 116 is swung in the engagement disengagement direction, thereby reducing the height of the cam 116 relative to the radial direction, so that the outer ring 140 can be mounted on the inner ring side unit 110.

[0008] In addition, as a second method, such as Figure 16 As shown, for example, it is possible to make the outer ring 140 able to be mounted on the inner ring side unit 110 by externally embedding an elastic fastening component 160 such as an O-ring onto the inner ring side unit 110 and keeping the cam 116 tilted in the disengagement direction.

[0009] Patent documents

[0010] Patent Document 1: Japanese Patent Application Publication No. 2013-160266 Summary of the Invention

[0011] However, in the first method described above, the coaxiality of the inner ring side unit 110 and the outer ring 140 needs to be satisfied with a very small coaxiality value when installing the outer ring 140 onto the inner ring side unit 110. Moreover, in the case of the inclined conveyor 170 described above, since the auxiliary motor 176 itself is a heavy object, it is difficult to ensure the coaxiality of the inner ring side unit 110 and the outer ring 140. Furthermore, if the installation work is performed without ensuring the expected coaxiality, it may cause damage to the overrunning one-way clutch 100b, especially the spacer ring 120.

[0012] On the other hand, although in the second method described above, the resilient fastener 160 can be removed from the inner ring side unit 110 by pressing it axially with the outer ring 140, it is necessary to remove the resilient fastener 160 so that it does not obstruct the operation of the overrunning one-way clutch 100b. However, for example, in the inclined conveyor 170 described above, as... Figure 17 As shown, the outer periphery of the overrunning one-way clutch 100b is surrounded by a dust cover 173, and the motor shaft 177 of the auxiliary motor 176 is connected to the rotating shaft of the reducer 171 (intermediate shaft 172 in the illustrated example). Therefore, after the overrunning one-way clutch 100b is assembled, it becomes a structure in which the elastic fastening member 160 cannot be physically retracted. In this structure, since the elastic fastening member 160 removed from the inner ring side unit 110 remains, the second method cannot be used.

[0013] As mentioned above, the installation of a one-way clutch requires a lot of effort, so in reality, it is necessary to improve the ease of installation.

[0014] The present invention is based on the above situation, and the technical problem to be solved is to provide a one-way clutch that can facilitate installation and reduce the installation burden.

[0015] This invention relates to a one-way clutch, comprising: an inner ring side unit on which a clutch mechanism is mounted, the clutch mechanism holding a plurality of cams, the plurality of cams being held oscillatingly by a spacer ring when a force is applied by a force-applying unit rotating in the engagement direction; and an outer ring configured to be coaxially disposed with the inner ring, the outer ring being able to be mounted on the inner ring side unit by axially moving the outer ring relative to the inner ring side unit. The problem is solved by the following: the inner ring side unit has a retaining portion for receiving an elastic fastening member, the elastic fastening member being externally embedded in the clutch mechanism during assembly to hold the cams in a tilted position in the engagement / disengagement direction, and being detachable from the clutch mechanism by relative movement of the inner ring side unit and the outer ring.

[0016] According to the one-way clutch of the present invention, since the outer ring can be mounted onto the inner ring side unit with the elastic fastening member externally embedded in the inner ring side unit and the cam's height relative to the radial direction reduced, it is not necessary to ensure the coaxiality of the inner ring side unit and the outer ring with high precision. Therefore, installation is easier and the installation burden is reduced. Furthermore, by using a retaining part to hold the elastic fastening member removed from the inner ring side unit, the operation of the one-way clutch can be prevented from being hindered even if the elastic fastening member is not retracted.

[0017] Furthermore, since the retaining part is positioned such that the elastic fastening member is kept in a state where it does not protrude radially outward from the circumference of the cam, the operation of the one-way clutch can be reliably prevented after the one-way clutch is assembled.

[0018] Furthermore, since the retaining part is configured to hold the elastic fastener in a state where the elastic force of the elastic fastener remains, the elastic fastener can be reliably held in place without falling off the retaining part.

[0019] Furthermore, since the retaining part is formed such that the radial distance between the top surface of the limiting part extending radially outward and the retaining surface of the elastic fastener is larger than the cross-sectional radius of the elastic fastener, the elastic fastener removed from the clutch mechanism can be reliably retained during installation.

[0020] Furthermore, by integrating the retaining part with the spacer or anti-detachment part, the number of parts is not increased unnecessarily, and the retaining mechanism can be constructed with a simple structure. This retaining mechanism can hold the unnecessary elastic fastening parts in place so as not to obstruct the operation of the one-way clutch after the one-way clutch is installed.

[0021] Furthermore, by utilizing a retaining member made of a plate-like body to form the retaining part, the plate-like body is positioned on the axially outer side of the spacer ring at a position that overlaps with the anti-disengagement part in the axial direction and has an elastic fastening member retaining surface. This allows a retaining mechanism to be formed within the axial length region of the inner ring, effectively preventing obstruction of the one-way clutch operation and increasing the design freedom of the spacer ring shape, etc. Attached Figure Description

[0022] Figure 1 This is an exploded perspective view showing the configuration of the one-way clutch according to the first embodiment of the present invention.

[0023] Figure 2 It means Figure 1 The diagram shows a cross-sectional view of the one-way clutch structure after it has been cut by a plane perpendicular to the axis of rotation.

[0024] Figure 3 It is a schematic representation. Figure 1 The diagram shows a cross-sectional view of the one-way clutch structure cut along a plane of rotation.

[0025] Figure 4 It is a three-dimensional diagram showing the structure of the spacer ring.

[0026] Figure 5 This is a schematic diagram showing the state of the cam after the one-way clutch has been assembled.

[0027] Figure 6 This is a schematic diagram showing the state of the cam when the one-way clutch is idling.

[0028] Figure 7 It is a schematic cross-sectional view showing the main components of the inner ring side unit cut off by a plane along the axis of rotation.

[0029] Figure 8 It is a diagram that schematically illustrates the structure of the retaining part.

[0030] Figure 9 This is a schematic diagram illustrating the configuration of an example of an inclined conveyor that uses a one-way clutch to prevent the rotating shaft from reversing and to cut off the reverse input to the auxiliary motor.

[0031] Figure 10A This diagram schematically illustrates the alignment of the outer ring mounted on the motor shaft and the inner ring side unit shaft mounted on the intermediate shaft of the reducer during the installation of a one-way clutch.

[0032] Figure 10B This diagram schematically illustrates the state in which the outer ring is inserted into the inner ring side unit and abuts against the elastic fastening member during the installation of a one-way clutch.

[0033] Figure 10C This diagram schematically illustrates the state in which the outer ring is installed in the appropriate position relative to the inner ring side unit during the installation operation of a one-way clutch.

[0034] Figure 11 This is an exploded perspective view showing the configuration of an example of a one-way clutch according to the second embodiment of the present invention.

[0035] Figure 12 It is a schematic representation. Figure 11 The cross-sectional view shown is of the main components of the one-way clutch cut off along a plane of rotation.

[0036] Figure 13 It is a three-dimensional diagram showing the structure of the retaining components.

[0037] Figure 14 This diagram illustrates the installation process of an existing one-way clutch. It schematically shows the positional relationship between the inner and outer rings with their shafts aligned.

[0038] Figure 15A This is a side view illustrating an example of the installation process for an existing one-way clutch.

[0039] Figure 15B This diagram illustrates an example of the installation process for an existing one-way clutch, schematically showing the state of the outer ring being inserted into the inner ring side unit.

[0040] Figure 16 These are diagrams illustrating other examples of the installation process for existing one-way clutches.

[0041] Figure 17This is a diagram illustrating other examples of the installation operation of an existing one-way clutch, and it is a diagram schematically showing the state of the outer ring being installed on the inner ring side unit.

[0042] Symbol Explanation

[0043] 100-One-way clutch; 100a-One-way clutch for preventing reverse rotation; 100b-One-way clutch for overrunning; 110-Inner ring side unit; 111-Inner ring; 112-Inner ring track surface; 113-Retaining groove; 115-Clutch mechanism; 116-Cam; 117-Shaft; 120-Spacer ring; 121a-Annular plate-shaped component; 121b-Annular plate-shaped component; 122-Connecting component; 123-Through hole; 125-Cam retainer; 130-Force application unit; 135-Anti-disengagement component; 1 40-Outer ring; 141-Outer ring track surface; 150-Retaining part; 150a-Elastic fastening component retaining surface; 151-Hook-shaped part; 152-Receiving part; 153-Arc-shaped bending part; 154-Restricting part; 155-Retaining component; 156-Through hole; 157-Annular step part; 160-Elastic fastening component; 170-Inclined conveyor; 171-Reducer; 172-Intermediate shaft; 173-Cover; 174-Main motor; 175-Belt conveyor; 176-Auxiliary motor; 177-Motor shaft. Detailed Implementation

[0044] (First Embodiment)

[0045] like Figures 1-3 As shown, the one-way clutch 100 according to the first embodiment of the present invention includes an inner ring side unit 110 and an outer ring 140 configured to be disposed coaxially with the inner ring side unit 110, and configured such that the outer ring 140 can be mounted onto the inner ring side unit 110 by axially moving the outer ring 140 relative to the inner ring side unit 110. Figure 1 and Figure 2 In the diagram, O is the axis of rotation.

[0046] The inner ring side unit 110 has an anti-disengagement part 135 that mounts the clutch mechanism 115 on the inner ring 111 and prevents the clutch mechanism 115 from disengaging from the inner ring 111.

[0047] The clutch mechanism 115 is configured such that each of the plurality of cams 116 is held freely by the spacer ring 120 while being stressed by the force-applying unit 130 in a manner that rotates in the engagement direction.

[0048] like Figure 4As shown, the spacer ring 120 is configured such that a pair of annular plate-shaped members 121a and 121b are connected in an axially spaced state by a plurality of rod-shaped connecting members 122 extending in the axial direction, and a cam retainer 125 is formed between the circumferentially adjacent connecting members 122.

[0049] The cam 116 of this embodiment has a shaft portion 117 on each of its two end faces extending along a plane perpendicular to the center of rotation. The shaft portion 117 is axially supported in the through holes 123 of the annular plate members 121a and 121b formed on the spacer ring 120, thereby being held freely in the spacer ring 120.

[0050] like Figure 5 As shown, the cam 116 is configured such that, in the assembled state of the one-way clutch 100, the center of gravity G of the cam 116 is located on the same side as the contact point between the cam 116 and the inner ring track surface 112, relative to the normal H extending from the contact point between the cam 116 and the outer ring track surface 141, and a rotational torque generated by centrifugal force acts in the direction that tilts the cam 116 in the disengagement direction. That is, when the one-way clutch 100 is idling, as... Figure 6 As shown, the cam 116 resists the force applied by the force-applying unit 130 through centrifugal force, and can swing in the engagement release direction and leave the inner ring track surface 112 and the outer ring track surface 141. Therefore, it can be used properly even when the inner ring 111 and the outer ring 140 are idling at high speed.

[0051] In this embodiment, the force-applying unit 130 is composed of a torsion coil spring, such as... Figure 5 As shown, the winding portion is externally mounted on the shaft portion 117 of the cam 116. One end of the torsion coil spring engages with the cam 116, and the other end engages with the connecting member 122 of the spacer ring 120. This allows force to be applied to the cam 116 so that it swings in the engagement direction and contacts the inner ring track surface 112 and the outer ring track surface 141, enabling all cams 116 to immediately engage through the rotation of the inner ring 111 or the outer ring 140. The force-applying unit 130 is not limited to a torsion coil spring; it can be any elastic body capable of applying force to the cam 116 in the engagement direction.

[0052] In this embodiment, such as Figure 3 As shown, the anti-detachment part 135 is constructed by installing retaining rings in each of the retaining grooves 113 formed to extend circumferentially on both sides of the clutch mechanism 115 on the inner ring track surface 112. The retaining rings are constructed by cutting off a part of the annular plate to make the planar shape into a C-shape.

[0053] Moreover, as well as Figure 7As shown, in the one-way clutch 100 of the present invention, the inner ring side unit 110 is configured to have a retaining portion 150 for receiving an elastic fastening member 160. The elastic fastening member 160 is externally fitted into the clutch mechanism 115 in such a way that it holds the cam 116 in an inclined position in the engagement release direction during assembly, and can be removed from the clutch mechanism 115 by the axial relative movement of the outer ring 140 relative to the inner ring side unit 110.

[0054] In this embodiment, the retaining portion 150 is formed on one annular plate-shaped member 121a, which is located on the front side when viewed axially from the counterclockwise direction of the engagement direction of the cam 116, thereby being integrally provided with the spacer ring 120. Specifically, as Figure 4 As shown, the retaining part 150 is composed of a plurality of radially outward hook-shaped parts 151, which are formed by bending a sheet-like part formed by slotting the outer periphery of one of the annular plate-shaped members 121a.

[0055] Although in this embodiment, for example, the same number of hook-shaped portions 151 as the cam retainer 125 are formed at equally spaced positions in the circumferential direction, the elastic fastening member 160 can be held in place as long as there are at least 3 hook-shaped portions 151.

[0056] Also Figure 8 As shown, the hook-shaped portion 151 has: a receiving portion 152, for example having a flat elastic fastening member retaining surface 150a, and extending axially; and a limiting portion 154, which is continuous with the receiving portion 152 by an arcuate bend 153 and extends radially outward. The elastic fastening member retaining surface 150a does not need to be a flat surface, and can also be formed by a curved surface, wherein the distance from the rotation axis increases from the axial center position of the elastic fastening member retaining surface 150a toward the axially outward side, and the radius of curvature is larger than the cross-sectional diameter of the elastic fastening member 160.

[0057] Although an annular elastic body is used for the elastic fastening member 160 in this embodiment, the elastic fastening member holding surface 150a of each hook portion 151 is located on the same circumference, which is larger than the inner diameter of the elastic fastening member 160 normally centered on the rotation axis, when viewed from above. Furthermore, the radial distance d between the top surface of the limiting portion 154 and the elastic fastening member holding surface 150a is configured to be larger than the cross-sectional radius r of the elastic fastening member 160. Therefore, the elastic fastening member 160 can be held in a state where it does not protrude radially outward from the circumference of the cam 116, and retains an elastic force acting radially inward (in the direction of diameter reduction). Thus, the elastic fastening member 160 can be reliably held in place without detaching from the hook portion 151, and the operation of the one-way clutch 100 can be reliably prevented from being hindered after assembly.

[0058] Furthermore, in this embodiment, each hook-shaped portion 151 is formed to protrude axially outward from the end face of one of the annular plate-shaped members 121a, and is configured not to protrude axially outward from the end face of the inner ring 111. This effectively prevents the holding portion 150 from contacting other components besides the one-way clutch 100, thus avoiding any obstruction to the operation of the one-way clutch 100.

[0059] The elastic fastening member 160 used when installing the outer ring 140 onto the inner ring side unit 110 can be any elastic body capable of exerting an elastic force radially inward. For example, an annular elastic body such as an O-ring, a C-shaped elastic body when viewed from above, or a spiral elastic body can be used. Furthermore, the radial cross-sectional shape of the elastic fastening member 160 does not need to be circular; for example, it can be made of an elastic body with flat wire wound around it.

[0060] The following explanation will focus on the installation method of the one-way clutch 100 described above, taking the case where the elastic fastening component 160 cannot be physically retracted after the one-way clutch 100 is assembled as an example.

[0061] Figure 9 This is a schematic diagram illustrating the configuration of an example of an inclined conveyor that uses a one-way clutch to prevent the rotating shaft from reversing and to cut off the reverse input to the auxiliary motor.

[0062] On the inclined conveyor 170, a one-way clutch 100a for preventing reverse rotation is installed on one end of the intermediate shaft 172 of the reducer 171, thereby preventing the intermediate shaft 172 from reversing. The inner ring of the one-way clutch 100a for preventing reverse rotation is installed on the intermediate shaft 172 of the reducer 171, while the outer ring is fixed to the housing of the reducer 171. During normal operation of the inclined conveyor 170, the one-way clutch 100a for preventing reverse rotation idles, and when the intermediate shaft 172 reverses, it engages to prevent the belt conveyor 175 from reversing. Here, the belt conveyor 175 is installed on the output shaft of the reducer 171, and downstream ( Figure 9 The middle (bottom side) tilts.

[0063] Furthermore, an overrunning one-way clutch 100b is installed at the other end of the intermediate shaft 172. This allows the reverse input to the auxiliary motor 176 to be cut off via the intermediate shaft 172 when the main motor 174, connected to the input shaft of the reducer 171, is driven. During normal operation, the tilting conveyor 170 is driven by the main motor 174. Therefore, during normal operation, the overrunning one-way clutch 100b idles, cutting off power transmission from the intermediate shaft 172 of the reducer 171 to the auxiliary motor 176. However, in emergency situations, such as in case of a failure of the main motor 174 or during maintenance, since the tilting conveyor 170 is driven by the auxiliary motor 176, the overrunning one-way clutch 100b engages, transmitting power from the auxiliary motor 176 to the intermediate shaft 172 of the reducer 171. Here, the overrunning one-way clutch 100b may, for example, be a clutch with the same configuration as the reverse-prevention one-way clutch 100a.

[0064] On the inclined conveyor 170, in order to prevent foreign objects such as dust from entering the interior of the reverse prevention one-way clutch 100a and the overrunning one-way clutch 100b and causing inconvenience such as malfunction of the cam 116, the outer periphery of the reverse prevention one-way clutch 100a and the overrunning one-way clutch 100b is covered with a dustproof cover 173 (see reference). Figures 10A to 10C ) surround.

[0065] Therefore, the overrunning one-way clutch 100b that connects the intermediate shaft 172 of the reducer 171 to the motor shaft of the auxiliary motor 176 has a structure in which the elastic fastening component 160 cannot be physically recovered after assembly.

[0066] When installing the overrunning one-way clutch 100b, such as Figure 10AAs shown, firstly, the inner ring side unit 110 with the embedded elastic fastening member 160 is installed onto the intermediate shaft 172 of the reducer 171 by means of a key connection, for example, and the outer ring 140 is fixed to the motor shaft 177 of the auxiliary motor 176 by screws.

[0067] Next, with the inner ring side unit 110 and the outer ring 140 aligned at their axes, as follows: Figure 10B As shown, the auxiliary motor 176, on which the outer ring 140 is mounted, is moved axially to insert the outer ring 140 into the inner ring side unit 110 mounted on the reducer 171. At this moment, since the height of the cam 116 relative to the radial direction is held by the elastic fastening member 160, and the maximum outer diameter of the inner ring side unit 110 is smaller than the inner diameter of the outer ring 140, high precision is not required for the coaxiality of the inner ring side unit 110 and the outer ring 140, and the outer ring 140 can be smoothly inserted into the inner ring side unit 110.

[0068] When the auxiliary motor 176, on which the outer ring 140 is mounted, moves further axially, then as Figure 10C As shown, the elastic fastening member 160 is pressed by the outer ring 140, thereby disengaging from the clutch mechanism 115, and then the elastic fastening member 160 is held by the retaining part 150 while its diameter is reduced by elastic force. Therefore, even if the elastic fastening member 160 is not retracted, it is possible to avoid hindering the operation of the overrunning one-way clutch 100b.

[0069] Thus, the one-way clutch 100 described above facilitates installation and reduces the installation burden.

[0070] (Second Implementation)

[0071] like Figure 11 and Figure 12 As shown, the retaining portion 150 of the one-way clutch 100 according to the second embodiment of the present invention is configured by a retaining member 155, which is composed of a plate-like body having an elastic fastening member retaining surface 150a, and otherwise has the same configuration as the one-way clutch 100 according to the first embodiment described above. Figure 11 and Figure 12 In this document, components that are identical to those in the one-way clutch 100 of the first embodiment are marked with the same symbols and their descriptions are omitted.

[0072] In this embodiment, such as Figure 13 As shown, the retaining member 155 is formed of an annular plate, which is formed such that a retaining groove extends along the entire circumference of its outer peripheral surface, and the retaining portion 150 is formed of the retaining groove. The retaining surface 150a of the elastic fastening member is formed by the bottom surface of the retaining groove, and the limiting portion 154 is formed by the sidewall of the retaining groove.

[0073] A through hole 156 extending axially is formed on the retaining member 155. In this embodiment, the retaining member 155 can be fixed to the spacer 120 by inserting one of the connecting members 122 of the spacer 120 into the through hole 156. Alternatively, the through holes 156 can be formed at multiple locations. In this configuration, by inserting the connecting members 122 of the spacer 120 corresponding to each through hole, the retaining member 155 can be fixed to the spacer at multiple locations.

[0074] like Figure 12 As shown, the maximum outer diameter of the retaining member 155 is configured, for example, to be smaller than the maximum outer diameter of the annular plate-shaped member 121a of one of the spacers 120, and the elastic fastening member 160 is in a state of protruding radially outward from the circumference of the cam 116 along the movement path of the elastic fastening member 160. Therefore, the elastic fastening member 160 can be pressed axially by the outer ring 140, and the elastic fastening member 160 can be reliably held by the retaining portion 150 without being stuck between the cam 116 and the retaining portion 150.

[0075] The bottom surface of the retaining groove constituting the retaining part 150 is located on a circumference centered on the rotation axis O, which is larger than the inner diameter of the ordinary elastic fastening member 160. The radial distance d between the top surface of the side wall of the retaining groove constituting the limiting part 154 and the retaining surface 150a of the elastic fastening member is formed to be larger than the cross-sectional radius r of the elastic fastening member 160. As a result, the elastic fastening member 160 can be held in a state in which it does not protrude radially outward from the circumference of the cam 116, and retains an elastic force acting radially inward (in the direction of diameter reduction).

[0076] An annular stepped portion 157 is formed on the inner peripheral edge of the retaining member 155 on one axial side, thereby allowing the retaining member 155 to be positioned on the axially outer side of the spacer ring 120, overlapping axially with the anti-disengagement portion 135. Therefore, in this embodiment, a retaining mechanism can be formed within the axial length region of the inner ring 111 without protruding axially outward from the end face of the inner ring 111, thus reliably preventing obstruction of the one-way clutch 100's operation, and increasing the design freedom, such as the shape of the spacer ring 120.

[0077] The same effects as those of the one-way clutch 100 described in the first embodiment can also be obtained in the one-way clutch 100 described in the second embodiment.

[0078] While the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Various design changes can be made without departing from the scope of the present invention as described in the technical solution.

[0079] For example, although the configuration in the first embodiment described above, in which the retaining part and the spacer are integrally formed, it is also possible to configure the retaining part and the anti-detachment part as integrally formed. Furthermore, although the configuration in which the retaining part is formed on either of the pair of annular plate-shaped members has been described, it is also possible to configure the retaining part to be formed on each of the pair of annular plate-shaped members.

[0080] Furthermore, although the second embodiment described above illustrates the case where the retaining part is constructed by providing a retaining member made of an annular plate, the retaining member does not need to be an annular plate. For example, it can be constructed by arranging multiple plate-shaped bodies with fan-shaped planar features spaced apart in the circumferential direction on the same circumference, or it can be constructed by arranging retaining members that shape wires or plates into hook shapes spaced apart in the circumferential direction on the same circumference. The fixing unit of the retaining member relative to the spacer ring is not particularly limited, and the retaining member can also be fixed using screws or the like.

[0081] Furthermore, although in the first and second embodiments described above, the anti-disengagement part is formed by providing retaining rings on both axial sides of the clutch mechanism, the anti-disengagement part can also be formed as an integral part of the spacer ring. Alternatively, the inner ring can be made into a structure with a step on one side, and the retaining ring can be provided only on one axial side of the clutch mechanism.

[0082] Furthermore, although the configuration in the first and second embodiments described above, in which the retaining part is configured not to protrude outward from the end face of the inner ring in the axial direction, the retaining part may also be configured to protrude outward from the end face of the inner ring in the axial direction.

Claims

1. A one-way clutch comprising: an inner ring side unit on which a clutch mechanism is mounted, the clutch mechanism holding a plurality of cams that are held swingably by a spacer ring in a state of being forced to rotate in an engaging direction by a force applying unit; and an outer ring configured to be arranged coaxially with the inner ring, the outer ring being capable of being mounted to the inner ring side unit by relatively moving the outer ring in an axial direction with respect to the inner ring side unit, characterized in that the inner ring side unit comprises a holding portion that receives an elastic fastening member, the elastic fastening member being fitted outside the clutch mechanism at the time of assembly so as to hold the cams in a posture of tilting in a disengaging direction, and being capable of being detached from the clutch mechanism by the relative movement of the inner ring side unit and the outer ring.

2. The one-way clutch according to claim 1, characterized in that the holding portion is configured to be capable of holding the elastic fastening member in a state in which the elastic fastening member does not protrude radially outward from a peripheral surface of the cam.

3. The one-way clutch according to claim 1, characterized in that the holding portion is configured to be capable of holding the elastic fastening member in a state in which the elastic force of the elastic fastening member remains.

4. The one-way clutch according to claim 1, characterized in that the holding portion has a receiving portion having an elastic fastening member holding surface, and a limiting portion that is continuous with the receiving portion and extends radially outward, and a radial distance between a tip surface of the limiting portion and the elastic fastening member holding surface is larger than a cross-sectional radius of the elastic fastening member.

5. The one-way clutch according to claim 1, characterized in that the holding portion is integrally provided with the spacer ring.

6. The one-way clutch according to claim 1, characterized in that the inner ring side unit comprises a detachment preventing portion that prevents the clutch mechanism from being detached from the inner ring, and the holding portion is integrally provided with the detachment preventing portion.

7. The one-way clutch according to claim 1, characterized in that the inner ring side unit comprises a detachment preventing portion that prevents the clutch mechanism from being detached from the inner ring, and the holding portion is configured by providing a holding member having an elastic fastening member holding surface at a position on an axially outer side of the spacer ring that overlaps the detachment preventing portion in the axial direction. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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