One way clutch

Abstract

To provide a one way clutch capable of facilitating assembling work and reducing an assembling burden.SOLUTION: The inner ring-side unit 115 in which the clutch mechanism 115 swingably held by the cage ring 120 is assembled to the inner ring 111 in a state where the plurality of cams 116 are biased by the biasing means 130 so as to rotate in the meshing direction includes the holding part 150 that is externally fitted to the clutch mechanism 115 so as to hold the cams 116 in a posture tilted in the meshing releasing direction at the time of assembly and receives the elastic fastening member 160 detached from the clutch mechanism 110 by the relative movement of the inner ring-side unit 110 and the outer ring 140.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a one-way clutch. [Background technology]

[0002] Currently, for example, inclined conveyors and bucket elevators used to lift objects from below upward, one-way clutches are preferably used to prevent the objects from running backward due to their own weight. Referring to FIG. 9, in this inclined conveyor 170, a one-way reverse clutch 100a is attached to one end of the intermediate shaft of the reducer 171, thereby preventing reverse rotation of the intermediate shaft. An overrunning one-way clutch 100b is attached to the other end of the intermediate shaft of the reducer 171, thereby blocking 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 reverse clutch 100a and the one-way overrunning clutch 100b may have the same configuration, for example. Reference numeral 175 in FIG. 9 denotes a belt conveyor attached to the output shaft of the reducer 171, with the downstream side (downward in FIG. 9) inclined. The outline arrow indicates the conveying direction of the conveyed object.

[0003] One type of one-way clutch used to prevent reverse rotation of the rotating shaft and cut off reverse input to auxiliary motor 176 is configured with inner and outer rings that are coaxially rotatable relative to one another, and a clutch mechanism disposed between the outer and inner rings. The clutch mechanism includes a cage ring that is disposed between the outer and inner rings and rotatable together with the inner or outer ring, multiple cams that are pivotally supported on the cage ring so as to be able to swing freely, and biasing means that biases each of the multiple cams in the meshing direction so that they come into contact with the inner and outer rings (see, for example, Patent Document 1).

[0004] In the inclined conveyor 170 shown in Figure 9, the overrunning one-way clutch 100b is configured, for example, by attaching an inner wheel unit, in which a clutch mechanism is assembled to an inner wheel, to the intermediate shaft of the reducer 171, and attaching an outer wheel to the motor shaft of the auxiliary motor 176, and with the inner wheel unit and outer wheel aligned, sliding the auxiliary motor 176 in the axial direction relative to the reducer 171 to assemble the outer wheel to the inner wheel unit. As described above, the biasing means biases the cam to oscillate in the meshing direction. Therefore, when the inner ring side unit and the outer ring are axially aligned, as shown in FIG. 14, a portion of the cam 116 protrudes radially outward from the outer ring raceway surface 141. For this reason, when assembling the outer ring 140 to the inner ring side unit 110, it is necessary to reduce the radial height of the cam 116 so that at least the maximum outer diameter of the inner ring side unit 110 is smaller than the inner diameter of the outer ring 140. Here, the maximum outer diameter of the inner ring side unit 110 refers to the size at which the distance between two parallel lines is greatest when the inner ring side unit 110 is sandwiched between them in a plan view. In FIG. 14, 111 is an inner ring, 120 is a cage ring, and 130 is a biasing means.

[0005] As a first method, as shown in Figure 15A, one or both of the outer ring 140 and the inner ring side unit 110 is rotated in the idling direction of the one-way clutch around the rotation axis O while sliding in the axial direction, thereby swinging the cam 116 in the disengagement direction as shown in Figure 15B, thereby lowering the radial height of the cam 116 and making it possible to assemble the outer ring 140 to the inner ring side unit 110. As a second method, as shown in Figure 16, an elastic tightening member 160 such as an O-ring is fitted onto the inner ring side unit 110 and the cam 116 is held in a position tilted in the disengagement direction, thereby making the outer ring 140 ready to be assembled to the inner ring side unit 110. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-160266 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the first method described above, it is necessary to assemble the outer ring 140 to the inner ring side unit 110 in a state where a very small value of coaxiality is satisfied between the inner ring side unit 110 and the outer ring 140. When used in the inclined conveyor 170 described above, since the auxiliary motor 176 itself is heavy, it is difficult to ensure coaxiality between the inner ring side unit 110 and the outer ring 140, and if the assembly work is performed without ensuring the desired coaxiality, there is a risk of damage to the over-running one-way clutch 100b, especially the cage ring 120. On the other hand, in the second method described above, the elastic tightening member 160 is removed from the inner ring side unit 110 by being pushed axially by the outer ring 140. However, the elastic tightening member 160 must be removed so as not to interfere with the operation of the over-running one-way clutch 100b. However, for example, in the inclined conveyor 170 described above, as shown in FIG. 17, the over-running one-way clutch 100b is surrounded by a dustproof cover 173, and further, 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). This makes it impossible to physically retrieve the elastic tightening member 160 after assembling the over-running one-way clutch 100b. In such a structure, the elastic tightening member 160 remains after being removed from the inner ring side unit 110, and therefore the second method cannot be adopted. As described above, the assembly work of a one-way clutch often requires a lot of labor, and there is a demand for improvements in the ease of assembly work.

[0008] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a one-way clutch that can be easily assembled and that reduces the assembly burden. [Means for solving the problem]

[0009] The present invention solves the above problem by providing a one-way clutch comprising an inner ring side unit in which a clutch mechanism is assembled to an inner ring, the clutch mechanism being held so as to be freely swingable by a cage ring while multiple cams are biased to rotate in the meshing direction by a biasing means, and an outer ring configured to be able to be arranged coaxially with the inner ring, and the outer ring being configured so that the outer ring can be assembled to the inner ring side unit by moving the outer ring relative to the inner ring side unit in the axial direction, and the inner ring side unit is configured to have a retaining portion that is fitted onto the clutch mechanism so as to hold the cams in a position tilted in the meshing release direction during assembly, and that receives an elastic tightening member that is removed from the clutch mechanism by the relative movement of the inner ring side unit and the outer ring. [Effects of the Invention]

[0010] According to the one-way clutch of the present invention, the outer ring can be assembled to the inner ring unit with the elastic tightening member fitted onto the inner ring unit to reduce the height of the cam in the radial direction, eliminating the need to ensure highly accurate concentricity between the inner ring unit and the outer ring. This facilitates assembly work and reduces the assembly workload. Furthermore, by retaining the elastic tightening member removed from the inner ring unit with a retaining portion, the operation of the one-way clutch can be prevented from being hindered even without retrieving the elastic tightening member.

[0011] Furthermore, since the holding portion is configured to hold the elastic fastening member in a state in which it does not protrude radially outward from the circumferential surface of the cam, it is possible to reliably prevent the operation of the one-way clutch from being hindered after assembly of the one-way clutch. Furthermore, since the holding portion is configured to be able to hold the elastic fastening member while the elastic force of the elastic fastening member remains, it is possible to reliably hold the elastic fastening member without it falling off the holding portion. Furthermore, by forming the holding portion so that the radial distance between the tip surface of the regulating portion extending radially outward and the elastic fastening member holding surface is greater than the cross-sectional radius of the elastic fastening member, it is possible to reliably hold the elastic fastening member that has been removed from the clutch mechanism during assembly. Furthermore, by forming the retaining portion integrally with the cage ring or the anti-slip portion, a retaining mechanism can be constructed with a simple structure without unnecessarily increasing the number of parts, and capable of retaining an elastic tightening member that becomes unnecessary after the one-way clutch is assembled without interfering with the operation of the one-way clutch. Furthermore, since the retaining portion is positioned so as to overlap axially with the anti-slip portion on the axially outer side of the cage ring and is composed of a retaining member made of a plate-shaped body having an elastic fastening member retaining surface, a retaining mechanism can be formed within the axial length region of the inner ring, which reliably prevents interference with the operation of the one-way clutch and also improves design freedom in terms of the shape of the cage ring, etc. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is an exploded perspective view showing the configuration of a one-way clutch according to a first embodiment of the present invention. [Figure 2] 2 is a cross-sectional view showing the configuration of the one-way clutch shown in FIG. 1, taken along a plane perpendicular to the rotation axis. [Figure 3] 2 is a cross-sectional view taken along a plane along the rotation axis, schematically illustrating the configuration of the one-way clutch shown in FIG. 1. FIG. [Figure 4] FIG. 2 is a perspective view showing the configuration of a cage ring. [Figure 5] FIG. 4 is a schematic diagram showing the state of the cam when the one-way clutch is assembled. [Figure 6] 5 is a schematic diagram showing the state of the cam when the one-way clutch rotates freely. FIG. [Figure 7] 3 is a cross-sectional view taken along a plane along the rotation axis, schematically showing the configuration of a main part of an inner ring side unit. FIG. [Figure 8] FIG. 2 is a diagram schematically illustrating a configuration of a holding portion. [Figure 9] FIG. 10 is a diagram showing a schematic configuration of an example of an inclined conveyor that uses a one-way clutch to prevent reverse rotation of a rotating shaft and to block reverse input to an auxiliary motor. [Figure 10A] 10 is a diagram illustrating a state in which an outer ring attached to a motor shaft and an inner ring side unit attached to an intermediate shaft of a reducer are aligned in an assembly operation of the one-way clutch. FIG. [Figure 10B] 10 is a diagram illustrating a state in which the outer ring is inserted into the inner ring side unit and comes into contact with the elastic fastening member during the assembly operation of the one-way clutch. FIG. [Figure 10C] 10 is a diagram illustrating a state in which the outer ring is assembled in a proper position relative to the inner ring side unit in the assembly operation of the one-way clutch. FIG. [Figure 11] FIG. 6 is an exploded perspective view showing the configuration of an example of a one-way clutch according to a second embodiment of the present invention. [Figure 12] 12 is a cross-sectional view taken along a plane along the rotation axis, schematically showing the main configuration of the one-way clutch shown in FIG. 11. FIG. [Figure 13] FIG. 2 is a perspective view showing a configuration of a holding member. [Figure 14] FIG. 10 is a diagram for explaining the assembly work of a conventional one-way clutch, and is a diagram schematically showing the positional relationship between the inner ring side unit and the outer ring when the inner ring side unit and the outer ring are aligned. [Figure 15A] FIG. 10 is a side view illustrating an example of an assembly operation of a conventional one-way clutch. [Figure 15B] FIG. 10 is a diagram for explaining an example of an assembly operation of a conventional one-way clutch, and is a diagram schematically showing a state in which an outer ring is inserted into an inner ring side unit. [Figure 16] 10A and 10B are diagrams illustrating another example of the assembly work of a conventional one-way clutch. [Figure 17] FIG. 10 is a diagram for explaining another example of the assembling work of the conventional one-way clutch, and is a diagram schematically showing a state in which the outer ring is assembled to the inner ring side unit. DETAILED DESCRIPTION OF THE INVENTION

[0013] [First embodiment] 1 to 3, a one-way clutch 100 according to a first embodiment of the present invention includes an inner ring side unit 110 and an outer ring 140 that can be arranged coaxially with the inner ring side unit 110, and is configured so that the outer ring 110 can be assembled to the inner ring side unit 110 by moving the outer ring 140 axially relative to the inner ring side unit 110. In FIGS. 1 and 2, O denotes the rotation axis.

[0014] The inner ring side unit 110 has a clutch mechanism 115 assembled to the inner ring 111 and includes a retaining portion 135 that prevents the clutch mechanism 115 from coming off the inner ring 111. The clutch mechanism 115 is configured such that a plurality of cams 116 are each urged by urging means 130 to rotate in the meshing direction and are held swingably by a cage ring 120 .

[0015] As shown in Figure 4, the cage ring 120 is configured by connecting a pair of annular plate-shaped members 121a, 121b with a space between them in the axial direction by a plurality of rod-shaped connecting members 122 extending in the axial direction, and a cam holding portion 125 is formed between adjacent connecting members 122 in the circumferential direction.

[0016] The cam 116 in this embodiment has a shaft portion 117 provided on each of both end faces extending along a plane perpendicular to the center of rotation so as to protrude outward in the axial direction, and the shaft portion 117 is journaled in through holes 123 formed in each of the annular plate-shaped members 121a, 121b in the cage ring 120, thereby allowing the cam 116 to swing freely on the cage ring 120.

[0017] 5, when the one-way clutch 100 is assembled, the center of gravity G of the cam 116 is on the same side as the contact point between the cam 116 and the inner ring raceway surface 112 with respect to a normal H extending from the contact point between the cam 116 and the outer ring raceway surface 141, and the rotational moment due to centrifugal force acts in a direction that tilts the cam 116 in the meshing disengagement direction. In other words, when the one-way clutch 100 is idling, as shown in FIG. 6, the centrifugal force causes the cam 116 to swing in the meshing disengagement direction against the biasing force of the biasing means 130, and the cam 116 is separated from the inner ring raceway surface 112 and the outer ring raceway surface 141. Therefore, the cam 116 can be used suitably even when the inner ring 111 and the outer ring 140 are idling at high speed.

[0018] In this embodiment, the biasing means 130 is constituted by a torsion coil spring, and as shown in Fig. 5, the wound portion is fitted onto the shaft portion 117 of the cam 116. One end of the torsion coil spring is engaged with the cam 116, and the other end is engaged with the connecting member 122 of the cage ring 120, thereby biasing the cam 116 to swing in the meshing direction and contact the inner ring raceway surface 112 and the outer ring raceway surface 141, and all of the cams 116 can be instantly meshed by rotation of the inner ring 111 or the outer ring 140. The biasing means 130 is not limited to a torsion coil spring, as long as it is an elastic body that can bias the cam 116 in the meshing direction.

[0019] In this embodiment, as shown in Figure 3, the anti-slip portion 135 is configured by attaching a retaining ring, which is configured by cutting out a portion of a circular plate so that its planar shape is C-shaped, to each of the retaining grooves 113 formed to extend circumferentially on both axial sides of the clutch mechanism 115 on the inner ring raceway surface 112.

[0020] Thus, in the one-way clutch 100 according to the present invention, as shown in FIG. 7, the inner ring side unit 110 is configured to include a retaining portion 150 that receives an elastic fastening member 160 that is fitted onto the clutch mechanism 115 so as to hold the cam 116 in a position tilted in the disengagement direction during assembly, and that is released from the clutch mechanism 115 by relative axial movement of the outer ring 140 with respect to the inner ring side unit 110.

[0021] In this embodiment, the holding portion 150 is formed on one of the annular plate-shaped members 121a located on the front side in a plan view from the axial direction in which the meshing direction of the cam 116 is counterclockwise, and is thereby provided integrally with the cage ring 120. Specifically, as shown in Fig. 4, the holding portion 150 is composed of a plurality of radially outwardly directed hook-shaped portions 151 formed by bending a plate-shaped portion formed by making a cut from the outer periphery of one of the annular plate-shaped members 121a. In this embodiment, the same number of hook-shaped portions 151 as the cam holding portions 125 are formed, for example, at positions arranged at equal intervals in the circumferential direction, but at least three hook-shaped portions 151 are required to hold the elastic fastening member 160.

[0022] 8, the hook-shaped portion 151 has, for example, a receiving portion 152 extending along the axial direction having a flat elastic fastening member holding surface 150a, and a restricting portion 154 extending radially outward and continuing from the receiving portion 152 via an arc-shaped curved portion 153. The elastic fastening member holding surface 150a does not need to be a flat surface, and may be formed by a curved surface in which the distance from the rotation axis increases from the axial center position of the elastic fastening member holding surface 150a toward the axial outward side, and the radius of curvature is larger than the cross-sectional diameter of the elastic fastening member 160.

[0023] In this embodiment, the elastic fastening member 160 uses an annular elastic body, but the elastic fastening member holding surfaces 150a of each hook-shaped portion 151 are positioned on the same circumference centered on the rotation axis in a plan view, which is larger than the inner diameter dimension of the elastic fastening member 160 in normal operation, and are configured so that the radial distance d between the tip surface of the regulating portion 154 and the elastic fastening member holding surfaces 150a is larger than the cross-sectional radius r of the elastic fastening member 160. This prevents the elastic fastening member 160 from protruding radially outward from the peripheral surface of the cam 116, and allows it to be held in a state where an elastic force acting radially inward (in the diameter-reducing direction) remains. This makes it possible to reliably hold the elastic fastening member 160 without it falling off the hook-shaped portions 151, and reliably prevents the operation of the one-way clutch 100 from being hindered after assembly.

[0024] Furthermore, in this embodiment, each hook-shaped portion 151 is formed so as to protrude axially outward from the end face of one of the annular plate-shaped members 121a, and is configured so as not to protrude axially outward from the end face of the inner ring 111. This reliably prevents the holding portion 150 from coming into contact with members other than the one-way clutch 100 and interfering with the operation of the one-way clutch 100.

[0025] The elastic fastening member 160 used when assembling the outer ring 140 to the inner ring side unit 110 may be any elastic body configured to allow an elastic force to act radially inward, and may be, for example, an annular elastic body such as an O-ring, a C-shaped elastic body in a plan view, or a spiral elastic body. Furthermore, the cross section of the elastic fastening member 160 in the radial direction does not need to be circular, and may be, for example, an elastic body formed by winding a flat wire.

[0026] The method of assembling the one-way clutch 100 will be described below by taking as an example a case where the one-way clutch 100 is structured so that the elastic tightening member 160 cannot be physically removed after assembly.

[0027] FIG. 9 is a diagram showing the schematic configuration of an example of an inclined conveyor in which a one-way clutch is used to prevent reverse rotation of the rotating shaft and to block reverse input to the auxiliary motor. In this inclined conveyor 170, a reverse prevention one-way clutch 100a is attached to one end of an intermediate shaft 172 of a reducer 171, thereby preventing reverse rotation of the intermediate shaft 172. The reverse prevention one-way clutch 100a has an inner ring attached to the intermediate shaft 172 of the reducer 171 and an outer ring attached and fixed to the case of the reducer 171. During normal operation of the inclined conveyor 170, the reverse prevention one-way clutch 100a runs idle, and when the intermediate shaft 172 rotates in the reverse direction, it engages, preventing the belt conveyor 175 from running in the reverse direction. Here, the belt conveyor 175 is attached to the output shaft of the reducer 171, and the downstream side (the lower side in Figure 9) is inclined.

[0028] An over-running one-way clutch 100b is attached to the other end of the intermediate shaft 172, thereby blocking reverse input to the auxiliary motor 176 via the intermediate shaft 172 when the inclined conveyor 170 is driven by the main motor 174, which is connected to the input shaft of the reducer 171. During normal operation, the inclined conveyor 170 is driven by the main motor 174, and therefore the over-running one-way clutch 100b runs idle during normal operation, blocking power transmission from the intermediate shaft 172 of the reducer 171 to the auxiliary motor 176. In addition, in an emergency, such as when the main motor 174 breaks down or during maintenance and inspection, the inclined conveyor 170 is driven by the auxiliary motor 176, and in that emergency, the over-running one-way clutch 100b engages, transmitting power from the auxiliary motor 176 to the intermediate shaft 172 of the reducer 171. Here, the over-running one-way clutch 100b may have the same configuration as the reverse rotation prevention one-way clutch 100a, for example.

[0029] In the inclined conveyor 170, the reverse prevention one-way clutch 100a and the overrunning one-way clutch 100b are surrounded by a dustproof cover (not shown in FIG. 9) to prevent foreign matter such as dust from entering the reverse prevention one-way clutch 100a and the overrunning one-way clutch 100b and causing problems such as malfunction of the cam 116. Therefore, the overrunning one-way clutch 100b that connects the intermediate shaft 172 of the reducer 171 and the motor shaft of the auxiliary motor 176 is structured so that the elastic fastening member 160 cannot be physically retrieved after assembly.

[0030] When assembling the overrunning one-way clutch 100b, first, as shown in FIG. 10A, the inner ring side unit 110 fitted with the elastic fastening member 160 is attached to the intermediate shaft 172 of the reducer 171, for example, by key fastening, and the outer ring 140 is attached to the motor shaft 177 of the auxiliary motor 176 by screwing. Next, with the inner race side unit 110 and the outer race 140 axially aligned, as shown in Fig. 10B, the auxiliary motor 176 to which the outer race 140 is attached is moved axially so that the outer race 140 is inserted into the inner race side unit 110 attached to the reducer 171. At this time, the radial height of the cam 116 is maintained by the elastic tightening member 160 so that the maximum outer diameter of the inner race side unit 110 is smaller than the inner diameter of the outer race 140. Therefore, the outer race 140 can be smoothly inserted into the inner race side unit 110 without requiring high precision for the coaxiality between the inner race side unit 110 and the outer race 140. When auxiliary motor 176, to which outer ring 140 is attached, is further moved in the axial direction, elastic fastening member 160 is pushed by outer ring 140 and disengages from clutch mechanism 115, as shown in Fig. 10C, and elastic fastening member 160 is held by holding portion 150 while contracting in diameter due to elastic force. Therefore, even if elastic fastening member 160 is not retrieved, it is possible to avoid impeding the operation of overrunning one-way clutch 100b. In this way, with the one-way clutch 100 described above, the assembly work can be easily performed, and the assembly burden can be reduced.

[0031] [Second embodiment] 11 and 12, a one-way clutch 100 according to a second embodiment of the present invention has the same configuration as the one-way clutch 100 according to the first embodiment, except that a retaining portion 150 is configured by arranging a retaining member 155 made of a plate-like body having an elastic fastening member retaining surface 150a. In Figs. 11 and 12, the same components as those in the one-way clutch 100 according to the first embodiment are given the same reference numerals, and descriptions thereof will be omitted.

[0032] 13, the holding member 155 is configured as an annular plate with a holding groove formed on its outer peripheral surface so as to extend over the entire circumference, and the holding groove constitutes the holding portion 150. The elastic fastening member holding surface 150a is configured as the bottom surface of the holding groove, and the restricting portion 154 is configured as the side wall of the holding groove.

[0033] The retaining member 155 has a through hole 156 extending in the axial direction, and in this embodiment, one of the connecting members 122 of the cage ring 120 is inserted into this through hole 156, thereby fixing the retaining member 155 to the cage ring 120. The through holes 156 may be formed in multiple locations, and in such a configuration, the connecting members 122 of the cage ring 120 may be inserted into the corresponding through holes, thereby fixing the retaining member 155 to the cage ring at multiple locations.

[0034] 12, the maximum outer diameter of the holding member 155 is configured to be smaller than the maximum outer diameter of, for example, one annular plate member 121a of the cage ring 120, and on the movement path of the elastic fastening member 160, the elastic fastening member 160 protrudes radially outward from the circumferential surface of the cam 116. This makes it possible for the outer ring 140 to press the elastic fastening member 160 in the axial direction, and makes it possible for the elastic fastening member 160 to be reliably held by the holding part 150 without getting stuck between the cam 116 and the holding part 150. The holding groove constituting the holding portion 150 has a bottom surface positioned on a circumference centered on the rotation axis O, which is larger than the inner diameter of the elastic fastening member 160 in normal operation, and is formed so that the radial distance d between the tip surface of the side wall of the holding groove constituting the regulating portion 154 and the elastic fastening member holding surface 150a is larger than the cross-sectional radius r of the elastic fastening member 160. This prevents the elastic fastening member 160 from protruding radially outward from the peripheral surface of the cam 116, and allows it to be held in a state where an elastic force acting radially inward (diameter-reducing direction) remains.

[0035] An annular step 157 is formed on the inner peripheral edge of one axial surface of the retaining member 155, which enables the retaining member 155 to be positioned so as to overlap in the axial direction with the retaining portion 135 on the axially outer side of the cage ring 120. Therefore, in this embodiment, the retaining mechanism can be configured within the axial length region of the inner ring 111 without protruding axially outward from the end face of the inner ring 111, which reliably prevents interference with the operation of the one-way clutch 100 and also improves the design freedom of the shape of the cage ring 120, etc.

[0036] The one-way clutch 100 according to the second embodiment can also achieve the same effects as the one-way clutch 100 according to the first embodiment.

[0037] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design modifications can be made without departing from the present invention as set forth in the claims. For example, in the first embodiment, the retaining portion is integral with the cage ring, but the retaining portion may be integral with the retaining portion. Also, in the above embodiment, the retaining portion is formed on one of the pair of annular plate members, but the retaining portion may be formed on each of the pair of annular plate members. Furthermore, in the second embodiment, the holding portion is described as being configured by providing a holding member made of an annular plate, but the holding member does not have to be an annular plate, and may be configured, for example, by arranging a plurality of plate-like bodies having a fan-shaped planar shape on the same circumference at intervals in the circumferential direction, or by arranging holding members formed from wire or plate material in a hook shape on the same circumference at intervals in the circumferential direction. The means for fixing the holding member to the cage ring is not particularly limited, and the holding member may be fixed by bolts, etc. Furthermore, in the first and second embodiments described above, the retaining portion is formed by providing retaining rings on both axial sides of the clutch mechanism, but the retaining portion may be configured to be formed integrally with the cage ring, or the inner ring may have a one-sided stepped structure and a retaining ring may be provided on only one axial side of the clutch mechanism. Furthermore, in the above first and second embodiments, a configuration has been described in which the retaining portion is provided in a state in which it does not protrude axially outward from the end face of the inner ring, but the retaining portion may be provided in a state in which it protrudes axially outward from the end face of the inner ring. [Explanation of symbols]

[0038] 100 One-way clutch 100a ··· One-way clutch to prevent reverse rotation 100b ··· One-way clutch for overrunning 110 Inner ring unit 111 ··· Inside 112 Inner ring raceway surface 113... Retaining groove 115 Clutch mechanism 116 Cam 117 Shaft 120 ··· Cage ring 121a Annular plate-shaped member 121b Annular plate-shaped member 122 Connecting member 123 through hole 125 Cam holder 130..... biasing means 135 ··· Retaining part 140 Outer ring 141 Outer ring raceway surface 150... Holding part 150a Elastic fastening member holding surface 151 Hook-shaped portion 152 Receiving part 153 Arc-shaped curved section 154 Regulatory Department 155 Retaining member 156 through hole 157 Annular step 160 Elastic fastening member 170 Inclined Conveyor 171 ··· Reducer 172 Intermediate shaft 173 ··· Cover 174 Main motor 175 ··· Belt conveyor 176 Auxiliary motor 177 Motor shaft

Claims

1. A one-way clutch comprising an inner ring-side unit in which a clutch mechanism is assembled to an inner ring, the clutch mechanism being held so as to be swingable by a cage ring in a state in which a plurality of cams are urged by an urging means to rotate in a meshing direction, and an outer ring configured to be able to be arranged coaxially with the inner ring, wherein the outer ring can be assembled to the inner ring-side unit by moving the outer ring relative to the inner ring-side unit in the axial direction, a one-way clutch, characterized in that the inner ring side unit has a retaining portion that is fitted onto the clutch mechanism so as to hold the cam in a position tilted in the disengagement direction during assembly, and that receives an elastic tightening member that is released from the clutch mechanism by relative movement of the inner ring side unit and the outer ring.

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

3. 2. The one-way clutch according to claim 1, wherein the holding portion is provided so as to be able to hold the elastic fastening member while the elastic force of the elastic fastening member remains.

4. The holding portion has a receiving portion having an elastic fastening member holding surface and a restricting portion extending radially outwardly from the receiving portion, 2. The one-way clutch according to claim 1, wherein a radial distance between a tip end surface of the restricting portion and a holding surface of the elastic fastening member is greater than a cross-sectional radius of the elastic fastening member.

5. 2. The one-way clutch according to claim 1, wherein the retaining portion is formed integrally with the cage ring.

6. the inner ring side unit includes a retaining portion that prevents the clutch mechanism from coming off the inner ring, 2. The one-way clutch according to claim 1, wherein the retaining portion is formed integrally with the retaining portion.

7. the inner ring side unit includes a retaining portion that prevents the clutch mechanism from coming off the inner ring, 2. The one-way clutch according to claim 1, wherein the retaining portion is configured by disposing a retaining member made of a plate-like body having an elastic fastening member retaining surface at a position axially overlapping with the anti-slip portion on the axial outer side of the cage ring.

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