One-way clutch

Abstract

To provide a one-way clutch which can be easily assembled and can reduce the assembly load. [Solution] An inner ring side unit (110) is assembled to an inner ring (111) and is configured such that a clutch mechanism (115) is held so as to be freely swingable by a cage ring (120) while multiple cams (116) are urged by a urging means (130) to rotate in the meshing direction, and is provided with a retaining portion (150) that receives an elastic tightening member (160) that is fitted onto the clutch mechanism (115) so as to hold the cams (116) in a position tilted in the meshing release direction during assembly, and is removed from the clutch mechanism (115) by relative movement of the inner ring side unit (110) and the outer ring (140).

Description

Technical Field

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

Background Art

[0002] Currently, for example, in an inclined conveyor or a bucket elevator used to lift a conveyed object from below to above, a one-way clutch is preferably used so that the conveyed object does not run backward due to its own weight. Referring to FIG. 9 for explanation, in this inclined conveyor 170, a one-way clutch 100a for reverse rotation prevention is attached to one end of the intermediate shaft of the speed reducer 171, thereby preventing the reverse rotation of the intermediate shaft. Further, an overrunning one-way clutch 100b is attached to the other end of the intermediate shaft of the speed reducer 171, thereby blocking the reverse input to the auxiliary motor 176 via the intermediate shaft during the drive by the main motor 174 connected to the input shaft of the speed reducer 171. The one-way clutch 100a for reverse rotation prevention and the overrunning one-way clutch 100b can use, for example, those having the same configuration as each other. Reference numeral 175 in FIG. 9 is a belt conveyor attached to the output shaft of the speed reducer 171 and inclined downward (lower side in FIG. 9) on the downstream side. The white arrow indicates the conveyance direction of the conveyed object.

[0003] Some types of one-way clutches used for preventing the reverse rotation of the rotating shaft and blocking the reverse input to the auxiliary motor 176 are configured to include an inner ring and an outer ring provided coaxially and rotatable relative to each other, and a clutch mechanism disposed between the outer ring and the inner ring. The clutch mechanism includes a cage ring rotatably disposed together with the inner ring or the outer ring between the outer ring and the inner ring, a plurality of cams pivotally supported by the cage ring, and biasing means for biasing each of the plurality of cams in the meshing direction to contact the inner ring and the outer ring (see, for example, Patent Document 1).

[0004] In the inclined conveyor 170 shown in Figure 9, the overrunning one-way clutch 100b is configured such that, for example, an inner ring unit, in which the clutch mechanism is assembled to the inner ring, is attached to the intermediate shaft of the reduction gear 171, and the outer ring is attached to the motor shaft of the auxiliary motor 176. With the inner ring unit and the outer ring aligned, the auxiliary motor 176 is axially slid relative to the reduction gear 171 to assemble the outer ring to the inner ring unit. As described above, the biasing means biases the cam to swing in the meshing direction, so when the inner ring unit and the outer ring are aligned, a part of the cam 116 protrudes radially outward from the outer ring raceway surface 141, as shown in Figure 14. For this reason, when assembling the outer ring 140 to the inner ring 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 unit 110 is smaller than the inner diameter of the outer ring 140. Here, the maximum outer diameter of the inner ring unit 110 refers to the size at which the distance between two parallel lines is maximized when the inner ring unit 110 is sandwiched between two parallel lines in a plan view. In Figure 14, 111 is the inner ring, 120 is the cage ring, and 130 is the biasing means.

[0005] As a first method, as shown in Figure 15A, one or both of the outer ring 140 and the inner ring unit 110 are slid axially while rotating around the rotation axis O in the free-running direction of the one-way clutch, causing the cam 116 to swing in the disengagement direction, as shown in Figure 15B. This reduces the radial height of the cam 116, making it possible to assemble the outer ring 140 to the inner ring unit 110. As a second method, as shown in Figure 16, an elastic clamping member 160, such as an O-ring, is fitted onto the inner ring unit 110 to hold the cam 116 in a tilted position in the disengagement direction, thereby making it possible to assemble the outer ring 140 onto the inner ring unit 110. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2013-160266 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, in the first method described above, the outer ring 140 must be assembled to the inner ring unit 110 while satisfying a very small degree of coaxiality between the inner ring unit 110 and the outer ring 140. Furthermore, when used in the inclined conveyor 170 described above, the auxiliary motor 176 itself is heavy, making it difficult to ensure coaxiality between the inner ring unit 110 and the outer ring 140. Moreover, if the assembly work is performed without ensuring the desired degree of coaxiality, there is a risk of damage to the overrunning one-way clutch 100b, particularly the cage ring 120. On the other hand, in the second method described above, the elastic clamping member 160 is removed from the inner ring unit 110 by being pushed axially by the outer ring 140. However, the elastic clamping member 160 must be removed so as not to obstruct the operation of the overrunning one-way clutch 100b. However, in the inclined conveyor 170 described above, as shown in Figure 17, the area around the overrunning one-way clutch 100b is surrounded by a dustproof cover 173, and furthermore, the motor shaft 177 of the auxiliary motor 176 is connected to the rotating shaft of the reduction gear 171 (intermediate shaft 172 in the illustrated example), making it physically impossible to recover the elastic clamping member 160 after the overrunning one-way clutch 100b is assembled. In such a structure, the elastic clamping member 160 that has been removed from the inner ring unit 110 remains, and therefore the second method cannot be adopted. As described above, assembling a one-way clutch often requires considerable effort, and there is a real need to improve the efficiency of the assembly process.

[0008] The present invention has been made based on the circumstances described above, and aims to provide a one-way clutch that can be easily assembled and reduces the assembly burden. [Means for solving the problem]

[0009] The present invention provides a one-way clutch comprising an inner ring-side unit having a clutch mechanism assembled to an inner ring, in which a plurality of cams are biased by a biasing means to rotate in the meshing direction and are held pivotably by a cage ring, and an outer ring configured to be positioned 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, and the inner ring-side unit is configured to have a holding part that is fitted onto the clutch mechanism so as to hold the cams in a tilted position in the meshing disengagement direction during assembly and which receives an elastic clamping member that is released from the clutch mechanism by the relative movement of the inner ring-side unit and the outer ring, thereby solving the above problem. [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 clamping member fitted onto the inner ring unit to reduce the height of the cam in the radial direction. Therefore, it is not necessary to ensure high precision in coaxiality between the inner ring unit and the outer ring. Consequently, assembly work can be easily performed and the assembly burden can be reduced. Moreover, by holding the elastic clamping member removed from the inner ring unit with a holding part, it is possible to avoid interference with the operation of the one-way clutch without having to retrieve the elastic clamping member.

[0011] Furthermore, since the holding portion is provided in a manner that allows the elastic clamping member to be held without protruding 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 the one-way clutch has been assembled. Furthermore, since the holding portion is provided in a manner that allows the elastic clamping member to be held while the elastic force of the elastic clamping member remains, it is possible to securely hold the elastic clamping member without it falling out of the holding portion. Furthermore, by forming the holding portion such that the radial distance between the tip surface of the radially outward-extending restricting portion and the elastic clamping member holding surface is greater than the cross-sectional radius of the elastic clamping member, it becomes possible to reliably hold the elastic clamping member that has been removed from the clutch mechanism during assembly. Furthermore, by providing the retaining portion integrally with the cage ring or retaining portion, a retaining mechanism can be constructed with a simple structure that does not unnecessarily increase the number of parts, and can hold the elastic clamping member, which becomes unnecessary after the assembly of the one-way clutch, without hindering the operation of the one-way clutch. Furthermore, since the retaining portion is positioned to overlap axially with the anti-slip portion on the axially outward side of the cage ring and is composed of a plate-like retaining member having an elastic clamping member retaining surface, the retaining mechanism can be configured within the axial length region of the inner ring, thereby reliably preventing interference with the operation of the one-way clutch and improving the design freedom of the cage ring shape and other aspects. [Brief explanation of the drawing]

[0012] [Figure 1] This is an exploded perspective view showing the configuration of a one-way clutch according to the first embodiment of the present invention. [Figure 2] Figure 1 shows a cross-sectional view taken from a plane perpendicular to the axis of rotation, illustrating the configuration of the one-way clutch. [Figure 3] Figure 1 is a schematic cross-sectional view of the one-way clutch configuration, cut along a plane parallel to the axis of rotation. [Figure 4] This is a perspective view showing the configuration of the cage ring. [Figure 5] This is a schematic diagram showing the state of the cam when the one-way clutch is assembled. [Figure 6] This is a schematic diagram showing the state of the cam when the one-way clutch is free-spinning. [Figure 7] It is a cross-sectional view taken along a plane along the rotation axis, schematically showing the main part configuration of the inner ring side unit. [Figure 8] It is a diagram schematically showing the configuration of the holding part. [Figure 9] It is a diagram schematically showing the configuration in an example of an inclined conveyor in which a one-way clutch is used to prevent reverse rotation of the rotation axis and block reverse input to the auxiliary motor. [Figure 10A] It is a diagram schematically showing a state where the outer ring attached to the motor shaft and the inner ring side unit attached to the intermediate shaft of the speed reducer are axially aligned in the assembly operation of the one-way clutch. [Figure 10B] It is a diagram schematically showing a state where the outer ring is inserted into the inner ring side unit and the outer ring abuts against the elastic tightening member in the assembly operation of the one-way clutch. [Figure 10C] It is a diagram schematically showing a state where the outer ring is assembled in the proper position with respect to the inner ring side unit in the assembly operation of the one-way clutch. [Figure 11] It is an exploded perspective view showing the configuration in an example of a one-way clutch according to the second embodiment of the present invention. [Figure 12] It is a cross-sectional view taken along a plane along the rotation axis, schematically showing the main part configuration of the one-way clutch shown in FIG. 11. [Figure 13] It is a perspective view showing the configuration of the holding member. [Figure 14] It 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 in a state where the inner ring side unit and the outer ring are axially aligned. [Figure 15A] It is a side view for explaining an example of the assembly work of a conventional one-way clutch. [Figure 15B] It is a diagram for explaining an example of the assembly work of a conventional one-way clutch, and is a diagram schematically showing a state where the outer ring is inserted into the inner ring side unit. [Figure 16] It is a diagram for explaining another example of the assembly work of a conventional one-way clutch. [Figure 17] This diagram illustrates another example of the assembly process for a conventional one-way clutch, and schematically shows the outer ring assembled to the inner ring unit. [Modes for carrying out the invention]

[0013] [First Embodiment] As shown in Figures 1 to 3, the one-way clutch 100 according to the first embodiment of the present invention comprises an inner ring unit 110 and an outer ring 140 configured to be positioned coaxially with the inner ring unit 110, and is configured so that the outer ring 110 can be assembled to the inner ring unit 110 by moving the outer ring 140 relative to the inner ring unit 110 in the axial direction. In Figures 1 and 2, O is the axis of rotation.

[0014] The inner ring unit 110 has a clutch mechanism 115 assembled to the inner ring 111 and includes a retaining part 135 that prevents the clutch mechanism 115 from coming off the inner ring 111. The clutch mechanism 115 is configured such that each of the multiple cams 116 is biased by a biasing means 130 to rotate in the meshing direction and is held pivotably by a cage ring 120.

[0015] As shown in Figure 4, the cage ring 120 is constructed by connecting a pair of annular plate-shaped members 121a and 121b at axial intervals by a plurality of rod-shaped connecting members 122 that extend 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 according to this embodiment has shaft portions 117 provided on each of its end faces, which extend along a plane perpendicular to the center of rotation, so as to protrude axially outward. The shaft portions 117 are pivotally supported in through holes 123 formed in each of the annular plate-shaped members 121a and 121b of the cage ring 120, thereby being held swingably within the cage ring 120.

[0017] As shown in Figure 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 the normal H extended 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 disengagement direction. That is, when the one-way clutch 100 is free-spinning, as shown in Figure 6, the cam 116 swings in the disengagement direction against the biasing force of the biasing means 130 due to centrifugal force, separating from the inner ring raceway surface 112 and the outer ring raceway surface 141, and therefore can be suitably used even when the inner ring 111 and the outer ring 140 are free-spinning at high speed.

[0018] In this embodiment, the biasing means 130 is composed of a torsion coil spring, and as shown in Figure 5, the wound portion is fitted onto 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 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, so that all cams 116 can immediately mesh by the 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 capable of biasing the cam 116 in the meshing direction.

[0019] In this embodiment, the retaining portion 135 is configured such that, as shown in Figure 3, a retaining ring is fitted into 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, with a portion of the annular plate cut out to form a C-shape in planar shape.

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

[0021] In this embodiment, the retaining 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 provided integrally with the cage ring 120. Specifically, as shown in Figure 4, the retaining portion 150 is composed of a plurality of radially outward-facing hook-shaped portions 151 formed by bending a piece-shaped portion formed by making a cut from the outer peripheral edge of one of the annular plate-shaped members 121a. In this embodiment, the same number of hook-shaped portions 151 as the cam holding portion 125 are formed, for example, at positions that are equally spaced in the circumferential direction. However, if there are at least three hook-shaped portions 151, the elastic clamping member 160 can be held.

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

[0023] In this embodiment, the elastic clamping member 160 uses an annular elastic body. However, the elastic clamping member holding surface 150a of each hook-shaped portion 151 is located on the same circumference, larger than the normal inner diameter dimension of the elastic clamping member 160 centered on the rotation axis in a plan view. The radial distance d between the tip surface of the restricting portion 154 and the elastic clamping member holding surface 150a is configured to be greater than the cross-sectional radius r of the elastic clamping member 160. As a result, the elastic clamping member 160 does not protrude radially outward from the circumferential surface of the cam 116, and can be held while an elastic force acting radially inward (contraction direction) remains. Therefore, it is possible to reliably hold the elastic clamping member 160 without it falling off the hook-shaped portion 151, and to reliably prevent the operation of the one-way clutch 100 from being hindered after the assembly of the one-way clutch 100.

[0024] Furthermore, in this embodiment, each hook-shaped portion 151 is formed to protrude axially outward from the end face of one annular plate-shaped member 121a, and is configured not to protrude axially outward from the end face of the inner ring 111 in the axial direction. This ensures that the holding portion 150 does not come into contact with other members other than the one-way clutch 100, thereby preventing interference with the operation of the one-way clutch 100.

[0025] The elastic clamping member 160 used when assembling the outer ring 140 to the inner ring unit 110 can be any elastic body configured to apply elastic force radially inward. For example, an annular elastic body such as an O-ring, a C-shaped elastic body in plan view, or a spiral-shaped elastic body can be used. Furthermore, the elastic clamping member 160 does not need to have a circular cross-sectional shape in the radial direction; for example, it may be made of an elastic body formed by winding a flat wire.

[0026] The assembly method for the one-way clutch 100 described above will be explained below, using as an example a case where the elastic clamping member 160 cannot be physically recovered after the assembly of the one-way clutch 100.

[0027] Figure 9 is a schematic diagram showing the 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 rotation prevention one-way clutch 100a is attached to one end of the intermediate shaft 172 of the reduction gear 171, thereby preventing the intermediate shaft 172 from rotating in the opposite direction. The reverse rotation prevention one-way clutch 100a has its inner ring attached to the intermediate shaft 172 of the reduction gear 171, and its outer ring is attached to the case of the reduction gear 171 and fixed in place. During normal operation of the inclined conveyor 170, the reverse rotation prevention one-way clutch 100a rotates freely, and engages when the intermediate shaft 172 reverses direction, preventing the belt conveyor 175 from moving in the opposite direction. Here, the belt conveyor 175 is attached to the output shaft of the reduction gear 171 and is inclined on the downstream side (downward side in Figure 9).

[0028] Furthermore, an overrunning 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 driven by the main motor 174 connected to the input shaft of the reduction gear 171. During normal operation, the inclined conveyor 170 is driven by the main motor 174, and therefore, during normal operation, the overrunning one-way clutch 100b slips, blocking power transmission from the intermediate shaft 172 of the reduction gear 171 to the auxiliary motor 176. In addition, in emergencies such as when the main motor 174 fails or during maintenance, the inclined conveyor 170 is driven by the auxiliary motor 176, and in emergencies, the overrunning one-way clutch 100b engages, transmitting power from the auxiliary motor 176 to the intermediate shaft 172 of the reduction gear 171. Here, the overrunning one-way clutch 100b can be one that has the same configuration as, for example, the reverse-prevention one-way clutch 100a.

[0029] In the inclined conveyor 170, in order to prevent foreign matter such as dust from entering the reverse-reverse one-way clutch 100a and the overrunning one-way clutch 100b and causing malfunctions such as failure of the cam 116, the area around the reverse-reverse one-way clutch 100a and the overrunning one-way clutch 100b is surrounded by a dustproof cover (not shown in Figure 9). Therefore, in the one-way clutch 100b for overrunning that connects the intermediate shaft 172 of the reduction gear 171 and the motor shaft of the auxiliary motor 176, the elastic clamping member 160 cannot be physically recovered after assembly.

[0030] When assembling the overrunning one-way clutch 100b, first, as shown in Figure 10A, the inner ring unit 110 with the elastic clamping member 160 fitted onto it is attached to the intermediate shaft 172 of the reduction gear 171, for example by key fastening, and the outer ring 140 is attached to the motor shaft 177 of the auxiliary motor 176 by screw fastening. Next, with the inner ring unit 110 and the outer ring 140 aligned, the auxiliary motor 176 to which the outer ring 140 is attached is moved axially, as shown in Figure 10B, to insert the outer ring 140 into the inner ring unit 110 attached to the reduction gear 171. At this time, the height of the cam 116 in the radial direction is held by the elastic clamping member 160 so that the maximum outer diameter of the inner ring unit 110 is smaller than the inner diameter of the outer ring 140. Therefore, it is possible to smoothly insert the outer ring 140 into the inner ring unit 110 without requiring high precision in the coaxiality between the inner ring unit 110 and the outer ring 140. When the auxiliary motor 176, to which the outer ring 140 is attached, is moved further axially, as shown in Figure 10C, the elastic clamping member 160 is pushed by the outer ring 140 and disengaged from the clutch mechanism 115, and the elastic clamping member 160 is held by the holding part 150 while its diameter is reduced by elastic force. Therefore, even without retrieving the elastic clamping member 160, it is possible to avoid obstruction of the operation of the overrunning one-way clutch 100b. Thus, with the one-way clutch 100 described above, assembly work can be easily performed and the assembly burden can be reduced.

[0031] [Second Embodiment] The one-way clutch 100 according to the second embodiment of the present invention has the same configuration as the one-way clutch 100 according to the first embodiment, except that the holding portion 150 is configured by arranging a holding member 155 which is made of a plate-shaped body having an elastic clamping member holding surface 150a, as shown in Figures 11 and 12. In Figures 11 and 12, the same reference numerals are used for components that are the same as those in the one-way clutch 100 according to the first embodiment, and their description is omitted.

[0032] In this embodiment, as shown in Figure 13, the retaining member 155 is made of an annular plate with a retaining groove formed on its outer circumferential surface that extends over the entire circumference, and the retaining portion 150 is made of the retaining groove. The elastic clamping member retaining surface 150a is made of the bottom surface of the retaining groove, and the regulating portion 154 is made of the side wall of the retaining groove.

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

[0034] As shown in Figure 12, the maximum outer diameter of the retaining member 155 is set to be smaller than, for example, the maximum outer diameter of one of the annular plate-shaped members 121a of the cage ring 120, so that on the movement path of the elastic clamping member 160, the elastic clamping member 160 protrudes radially outward from the circumferential surface of the cam 116. As a result, the outer ring 140 can push the elastic clamping member 160 in the axial direction, making it possible to securely hold the elastic clamping member 160 in the retaining part 150 without it getting stuck between the cam 116 and the retaining part 150. The retaining grooves constituting the retaining portion 150 are positioned on the circumference centered on a rotation axis O whose bottom surface is larger than the inner diameter of the elastic clamping member 160 under normal conditions. The radial distance d between the tip surface of the side wall of the retaining groove constituting the regulating portion 154 and the elastic clamping member retaining surface 150a is formed to be greater than the cross-sectional radius r of the elastic clamping member 160. As a result, the elastic clamping member 160 does not protrude radially outward from the circumferential surface of the cam 116, and can be held while an elastic force acting radially inward (contraction direction) remains.

[0035] An annular step 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 so as to overlap axially with the retaining portion 135 on the axially outward side of the cage ring 120. For this reason, 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, thereby reliably preventing interference with the operation of the one-way clutch 100, and improving the design freedom of the cage ring 120, etc.

[0036] In the one-way clutch 100 according to the second embodiment, the same effects and advantages as those of the one-way clutch 100 according to the first embodiment can be obtained.

[0037] Although 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 described in the claims. For example, in the first embodiment described above, a configuration in which the retaining portion is provided integrally with the cage ring was explained, but the retaining portion may also be provided integrally with the anti-slip portion. Also, in the configuration described above, in which the retaining portion is formed on one of the pair of annular plate-shaped members, the retaining portion may also be formed on each of the pair of annular plate-shaped members. Furthermore, although the second embodiment described above describes a configuration in which the holding portion is provided with a holding member made of an annular plate, the holding member does not have to be an annular plate. For example, it may be configured by arranging a plurality of plate-like bodies with a fan-shaped planar shape at intervals in the circumferential direction on the same circumference, or by arranging holding members formed from wire or plate material into a hook shape at intervals in the circumferential direction on the same circumference. The means for fixing the holding member to the cage ring are not particularly limited, and the holding member may be fixed with bolts or the like. 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. However, the retaining portion may be formed integrally with the cage ring, or the inner ring may have a stepped structure on one side, and the retaining ring may be provided only on one axial side of the clutch mechanism. Furthermore, although the first and second embodiments described above describe a configuration in which the retaining portion does not protrude axially outward from the end face of the inner ring, the retaining portion may also 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 for preventing reverse rotation 100b... One-way clutch for overrunning 110 ··· Inner ring unit 111 ··· Inner circle 112 ··· Inner track surface 113... Retaining groove 115... Clutch mechanism 116... Cam 117 ··· Shaft 120 ··· Cage ring 121a ··· Ring-shaped plate member 121b ··· Ring-shaped plate member 122 ··· Connecting component 123 ··· Through hole 125... Cam retaining part 130 ··· Biasing means 135 ··· Retaining part 140 ··· Outer ring 141 ··· Outer ring raceway 150... Holding part 150a ··· Elastic clamping member holding surface 151 ··· Hook-shaped part 152 ··· Receiving part 153 ··· Arc-shaped curved section 154 ··· Regulatory Department 155 ··· Retaining member 156 ··· Through hole 157 ··· Circular step section 160 ··· Elastic clamping 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 having an inner ring in which a clutch mechanism is assembled to the inner ring, in which a clutch mechanism is held to swing freely by a cage ring while a plurality of cams are biased by a biasing means to rotate in the meshing direction, and an outer ring configured to be positioned 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 unit is fitted onto the clutch mechanism so as to hold the cam in a tilted position in the disengagement direction during assembly, and includes a holding portion that receives an elastic clamping member which is disengaged from the clutch mechanism by the relative movement of the inner ring unit and the outer ring.

2. The one-way clutch according to claim 1, characterized in that the holding portion is provided so as to be able to hold the elastic clamping member in a state in which the elastic clamping member does not protrude radially outward from the circumferential surface of the cam.

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

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

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

6. The inner ring side unit is equipped with a retaining portion that prevents the clutch mechanism from coming off the inner ring, The one-way clutch according to claim 1, characterized in that the retaining portion is provided integrally with the retaining portion.

7. The inner ring side unit is equipped with a retaining portion that prevents the clutch mechanism from coming off the inner ring, The one-way clutch according to claim 1, characterized in that the retaining portion is configured such that a retaining member made of a plate-like body having an elastic clamping member retaining surface is arranged at a position that axially overlaps with the retaining portion on the axially outward side of the cage ring.

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