Cam clutch

Abstract

To provide a cam clutch capable of preventing generation of jamming of a cam to perform smooth operation including operation mode switching operation, with a simple structure without increasing in size and the number of components.SOLUTION: A cam clutch 100 comprises a cam interlocking mechanism 150 in which a first cam 130a and a second cam 130b whose meshing directions are different from each other are used as engagers for transmitting and blocking torque between an inner ring 110 and an outer ring 120, and which is configured to tilt the second cam 130b in the disengagement direction to separate the engaging surface of the second cam 130b from a raceway surface 111 of the inner ring 110 and / or a raceway surface 121 of the outer ring 120 as the first cam 130a tilts in the meshing direction.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a cam clutch that is configured to be switchable between, for example, a free mode that allows relative rotational movement in both directions between an outer ring and an inner ring, and a locked mode that prohibits relative rotational movement in either the forward or reverse direction or both directions between the outer ring and the inner ring. [Background technology]

[0002] As a clutch that controls the transmission and interruption of rotational force, a two-way clutch that can switch between driving and idling in both the forward and reverse directions is known. For example, Patent Document 1 describes a clutch that is configured to be able to switch between three operating modes by controlling a retainer that holds both first and second sprags, which are biased by a biasing means so that the rotation lock direction is reversed: a bidirectional free mode that allows rotation in both the forward and reverse directions, a one-way locked mode that allows rotation only in the forward direction and prohibits rotation in the reverse direction, and a one-way locked mode that allows rotation only in the reverse direction and prohibits rotation in the forward direction. Furthermore, for example, cited document 2 describes a cam clutch in which one sprag that engages in one rotational direction and the other sprag that engages in the other rotational direction are held by a common retainer so that they are arranged in opposite directions alternately on the same circumference. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-231828 A [Patent Document 2] Japanese Patent Application Publication No. 62-52227 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned two-way clutch, one sprag and the other sprag are biased so as to contact the inner and outer rings, and when torque is applied to the inner or outer ring, one sprag tilts so as to immediately begin to mesh with the inner and outer rings, while the other sprag continues to slide in contact with the inner and outer rings, maintaining a state of waiting to mesh. When the torque is released, one of the sprags will tilt in the disengagement direction and transition to a free-spinning state. However, at this time, before one of the sprags is disengaged, the other sprag may tilt in the engagement direction and begin to engage with the inner and outer rings, resulting in a "meshing" condition in which all of the cams engage at the same time. In this state, all the sprags are engaged with high surface pressure, so when the clutch operation mode is switched from a locked mode, which prohibits relative rotation of the outer and inner rings in either one or both directions, to a free mode, which allows relative rotation of the outer and inner rings in both directions, a large force is required to change the position of the sprags, which could damage the engagement surfaces of the sprags with the inner and outer rings and the raceway surfaces of the inner and outer rings, and shorten the life of the clutch. Another problem is that a position-changing member for changing the position of the sprags needs to have high rigidity.

[0005] Furthermore, when switching operating modes, it is necessary to operate the attitude-changing member in a circumferential or radial direction or a direction including these. Therefore, when the outer ring is used as the input rotating body, it is necessary to rotate the attitude-changing member synchronously with the outer ring before operating it. Furthermore, it is necessary to provide a separate operation mode switching mechanism, which may result in an increase in the clutch size, an increase in the number of parts, and a decrease in holding torque.

[0006] The present invention has been made based on the above circumstances, and has an object to provide a cam clutch that has a simple structure without increasing the size or number of parts, prevents the occurrence of cam jamming, and enables smooth operation, including switching between operating modes. [Means for solving the problem]

[0007] The present invention relates to a cam clutch including an inner ring and an outer ring that are coaxially and relatively rotatable, a plurality of cams that are spaced apart in the circumferential direction between the inner ring and the outer ring, and a biasing means that biases each of the plurality of cams to contact the inner ring and the outer ring, the plurality of cams including a first cam and a second cam that have mutually different meshing directions with the inner ring and the outer ring, and a cam interlocking mechanism that tilts each of the plurality of cams in an interlocking manner, the cam interlocking mechanism being configured to tilt the second cam in an engagement release direction in accordance with the tilting of the first cam in the engagement direction, thereby separating the engagement surface of the second cam from the raceway surface of the inner ring and / or the raceway surface of the outer ring. the cam interlocking mechanism includes a cylindrical inner-ring-side cage ring and a cylindrical outer-ring-side cage ring that are coaxially disposed between the inner ring and the outer ring and are rotatable together with the inner ring or the outer ring, and the inner-ring-side cage ring and the outer-ring-side cage ring rotate with the inclination of the first cam in the engagement direction, thereby tilting the second cam in the engagement release direction; at least one or both of the inner-ring-side cage ring and the outer-ring-side cage ring are disposed so as to be movable in the axial direction independent of the rotation of the inner ring and the outer ring, and by moving at least one or both of the inner-ring-side cage ring and the outer-ring-side cage ring in the axial direction, switching is possible between a free mode that permits relative rotational movement between the outer ring and the inner ring in both directions and a lock mode that prohibits relative rotational movement between the outer ring and the inner ring in either one or both of the forward and reverse directions. Thereby, the above-mentioned problems are solved. Effect of the Invention

[0008] According to the invention of claim 1, in conjunction with the first cam that tilts to mesh with the inner and outer rings when torque is applied to the inner or outer ring, the second cam that is normally kept in a meshing standby state is tilted in the meshing release direction to separate the engagement surface of the second cam from the raceway surface of the inner ring and / or the raceway surface of the outer ring, so that even if the second cam tilts in the meshing direction when torque is removed, the second cam can be prevented from meshing with the inner and outer rings until the meshing of the first cam is released. This allows for smooth operation and high responsiveness.

[0009] According to the present invention, By linking the tilting movements of the first cam and the second cam with the rotation of the cage ring that regulates the circumferential position of each of the multiple cams, it is possible to avoid a complicated cam clutch structure and an increase in the number of parts. Also, by providing an inner cage ring and an outer cage ring, it is possible to easily link the tilting movements of the cams and easily change the posture of the cams.

[0010] According to the present invention, Since the operation mode can be switched by tilting the cam simply by moving at least one of the cage rings in the axial direction, it is not necessary to synchronize the rotation of the mechanism for changing the cam position with the outer or inner ring used as the input rotating body, and delicate operation is not required, and it is possible to avoid an increase in the size of the cam clutch and an increase in the number of parts. Moreover, since a large force is not required to change the cam position when switching the operation mode from the locked mode to the free mode, there is no risk of damaging the engagement surface of the cam, the raceway surface of the inner ring, and the raceway surface of the outer ring, and a long life can be achieved. In addition, by using a cage ring that can ensure a relatively high rigidity to change the cam position, the risk of damage when switching the operation mode can be reduced and high robustness can be obtained.

[0011] Claim 2 According to the present invention, the cage ring as a cam interlocking mechanism and the mechanism for changing the cam position are integrally configured, which allows for miniaturization, a reduction in the number of parts, and an increase in holding torque. Also, by changing the shape of the opening of the cam housing part of the cage ring from a simple rectangular shape to an irregular shape that matches the cam position, it is possible to release slight engagement caused by manufacturing errors with a small thrust. Furthermore, by appropriately changing the shape of the opening of the cam housing part of the cage ring, it is possible to realize more operation modes and their switching.

[0012] Claim 3 According to the invention, when the operating mode of the cam clutch is set to free mode, the phase of the circumferential position of the corresponding cam accommodating portions of the inner cage ring and the outer cage ring can be maintained in a state in which the cam engagement surfaces are separated from the inner ring raceway surface and / or the outer ring raceway surface, thereby preventing the cams from accidentally becoming jammed. Claim 4 According to the present invention, it is possible to easily eliminate slight jamming that occurs unexpectedly due to manufacturing errors or the like.

[0013] Claim 5According to the invention, even if the attitude of the cam changes, the gap between the cam accommodating portion of the cage ring and the cam does not change, so high interlocking can be obtained. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a perspective view showing one configuration example of a cam clutch of the present invention. [Diagram 2] 2 is a cross-sectional perspective view of the cam clutch shown in FIG. 1, taken along a plane including a rotation axis. [Diagram 3] 2 is an axial cross-sectional view of the cam clutch shown in FIG. 1, taken along a plane including a rotation axis. [Figure 4] 2 is a radial cross-sectional view of the cam clutch shown in FIG. 1, taken along a plane perpendicular to the rotation axis of the cam clutch. [Diagram 5] 2 is a perspective view showing a configuration of a biasing means in the cam clutch shown in FIG. 1. [Figure 6A] FIG. 4 is a perspective view showing the configuration of an inner cage ring. [Figure 6B] FIG. 6B is a partial development view of the inner cage ring shown in FIG. 6A. [Figure 7A] FIG. 4 is a perspective view showing the configuration of an outer race side cage ring. [Figure 7B] FIG. 7B is a partial development view of the outer race side cage ring shown in FIG. 7A. [Figure 8] 2 is a rear view seen from the rear side in the cage ring movement direction, showing a state in which the operation mode of the cam clutch shown in FIG. 1 has been switched from a bidirectional lock mode to a bidirectional free mode. FIG. [Figure 9] 9 is a cross-sectional perspective view of the cam clutch in the state shown in FIG. 8, taken along a plane including the rotation axis. [Figure 10] FIG. 9 is an enlarged view showing the area surrounded by the dashed line in FIG. 8. [Figure 11] FIG. 4 is a plan view showing the configuration of a cam. [Figure 12] 11A and 11B are schematic diagrams for explaining interlocking operations of cams. [Figure 13A]10 is a partial radial cross-sectional view taken along a plane perpendicular to the rotation axis, showing the state of a cam when the operation mode of the cam clutch is set to a bidirectional lock mode. FIG. [Figure 13B] 4 is a partial radial cross-sectional view taken along a plane perpendicular to the rotation axis, showing the state of a cam when the operation mode of the cam clutch is in a free mode. FIG. [Figure 14] FIG. 2 is a partial development view showing, in outline, the configuration of an inner cage ring that constitutes a cam interlocking mechanism that can realize a three-mode compatible cam clutch. [Figure 15A] FIG. 13 is a plan view of a cam clutch illustrating another example of the configuration of the cam interlocking mechanism, showing a state in which the operation mode of the cam clutch is set to a bidirectional lock mode. [Figure 15B] 13 is a plan view showing a state of the cam interlocking mechanism when the operation mode of the cam clutch is set to a one-way lock mode. FIG. [Figure 15C] 13 is a plan view showing a state of the cam interlocking mechanism when the operation mode of the cam clutch is set to a bidirectional free mode. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] An embodiment of the present invention will be described with reference to FIGS. 1 to 13B.

[0016] As shown in Figures 1 to 4, the cam clutch 100 of the present invention comprises an inner ring 110 and an outer ring 120 which are arranged on the same axis and are capable of relative rotation, a plurality of cams which are arranged at intervals in the circumferential direction in the annular space between the raceway surface 111 of the inner ring 110 and the raceway surface 121 of the outer ring 120 and serve as engaging elements for transmitting and blocking torque between the inner ring 110 and the outer ring 120, a biasing means 140 which biases each of the plurality of cams in the meshing direction so as to contact the inner ring 110 and the outer ring 120, and a cam interlocking mechanism 150 which tilts each of the plurality of cams in interlocking fashion.

[0017] Each of the multiple cams includes a first cam 130a and a second cam 130b that have mutually different meshing directions with the inner ring 110 and the outer ring 120. In this embodiment, the first cam 130a and the second cam 130b have, for example, the same outer shape, and the first cam 130a is turned upside down and used as the second cam 130b.

[0018] The first cam 130a and the second cam 130b are arranged alternately in the circumferential direction on the same circumference, whereby the cam clutch 100 is configured to be capable of realizing a bidirectional lock mode in which relative rotational movement of the inner ring 110 and the outer ring 120 in both directions is prohibited.

[0019] The first cams 130a are arranged at equal intervals in the circumferential direction, and the second cams 130b are arranged at equal intervals in the circumferential direction at a position offset toward the disengagement direction of the first cams 130a from the center position between two adjacent first cams 130a. With this cam arrangement, it is possible to reduce structural restrictions on the change in cam position (amount of rotation) when switching the operation mode of the cam clutch 100 to the bidirectional free mode, compared to an arrangement in which all cams are arranged at equal intervals. The arrangement of the multiple cams 130a, 130b is not particularly limited, and the first cams 130a and the second cams 130b may be arranged at equal intervals in the circumferential direction.

[0020] The meshing direction of the first cam 130a is counterclockwise in Figure 4, and the first cam 130a is configured to mesh with the inner ring 110 and the outer ring 120 when the inner ring 110 is rotated in the forward direction (clockwise) or the outer ring 120 is rotated in the reverse direction (counterclockwise). The meshing direction of the second cam 130b is clockwise in Figure 4, and the second cam 130b is configured to mesh with the inner ring 110 and the outer ring 120 when the inner ring 110 is rotated in the reverse direction (counterclockwise) or when the outer ring 120 is rotated in the forward direction (clockwise).

[0021] The biasing means 140 is formed of, for example, a ribbon spring. The biasing means 140 may be an elastic body capable of biasing each of the plurality of cams 130a, 130b in the meshing direction, and may be, for example, a plurality of leaf springs or torsion springs.

[0022] 5, the ribbon spring as the biasing means 140 is composed of a pair of annular portions 141 extending parallel to each other in the circumferential direction, and a plurality of connecting portions 142 connecting the annular portions 141 in the axial direction at predetermined intervals, and the spaces between adjacent connecting portions 142 form cam accommodating portions 145. The cam accommodating portions 145 are provided at equal intervals along the circumferential direction. The connecting portion 142 is formed with a V-shaped cross section that protrudes radially outward, and is configured to form a leaf spring portion. The connecting portion 142 is provided with pressing portions 143 that extend in an arc shape on both end edges, every other one of the two ends. These pressing portions 143 urge the first cam 130a and the second cam 130b in the meshing direction with the inner ring 110 and the outer ring 120, respectively.

[0023] The cam linkage mechanism 150 comprises a cylindrical inner ring side cage ring 160 and a cylindrical outer ring side cage ring 170 which are coaxially arranged between the inner ring 110 and the outer ring 120 and can rotate together with the inner ring 110 or the outer ring 120, and is configured so that the inner ring side cage ring 160 and the outer ring side cage ring 170 rotate as the first cam 130a tilts in the meshing direction, thereby tilting the second cam 130b in the meshing release direction and separating the engagement surface of the second cam 130b from the orbital surface 111 of the inner ring 110 and / or the orbital surface 121 of the outer ring 120. By linking the tilting movements of the first cam 130a and the second cam 130b with the rotation of the cage ring that regulates the circumferential position of each of the multiple cams, it is possible to avoid complicating the structure of the cam clutch 100 and increasing the number of parts. Also, by providing the inner race side cage ring 160 and the outer race side cage ring 170, it is possible to easily link the tilting movements of the cams and also to easily change the posture of the cams.

[0024] In addition, the inner cage ring 160 is provided so as to be movable in the axial direction independently of the rotation of the inner ring 110 and the outer ring 120, and the cam clutch 100 is configured so as to be switchable between a bidirectional lock mode in which the relative rotation of the inner ring 110 and the outer ring 120 in both directions is prohibited and a bidirectional free mode in which the relative rotation of the inner ring 110 and the outer ring 120 in both directions is permitted by moving the inner cage ring 160 in the axial direction. Therefore, it is not necessary to synchronize the rotation of the cam attitude change mechanism with the inner ring 110 or the outer ring 120 used as the input side rotating body, and delicate operation is not required, and it is possible to avoid an increase in the size of the cam clutch 100 and an increase in the number of parts. In addition, when the operation mode of the cam clutch 100 is switched from the bidirectional lock mode to the free mode, a large force is not required to change the attitude of the cam, so there is no risk of damaging the engagement surface of the cam, the raceway surface 111 of the inner ring 110, and the raceway surface 121 of the outer ring 120, and it is possible to achieve a long life. In addition, by using a cage ring that can ensure relatively high rigidity to change the posture of the cam, it is possible to reduce the risk of damage when switching operating modes and achieve high robustness.

[0025] 6A and 6B, the inner cage ring 160 has a cylindrical main body 161 extending in the axial direction, and a flange 166 extending radially outward from a rear side end of the main body 161 in the cage ring movement direction (axial direction). The flanges 166 are provided at two circumferential positions facing each other with the rotation axis in between, so as to extend in the circumferential direction.

[0026] The main body 161 has a plurality of cam housing portions formed to be arranged at equal intervals p1 in the circumferential direction, for example. In the embodiment, the cam housing portions are arranged at equal intervals in the circumferential direction, but they may be arranged with some regularity or randomly. The axially extending pillar portion 163a, which separates the first cam accommodating portion 162a in which the first cam 130a is accommodated and the second cam accommodating portion 162b in which the second cam 130b adjacent to the first cam 130a in the disengagement direction is accommodated, has a cam posture changing portion 164 formed in a tapered shape so as to widen toward the rear at the rear end in the cage ring movement direction. In the cam clutch 100 of this embodiment, the cam position change section 164, which is a mechanism for changing the position of the cam, is integrally configured with the inner cage ring 160 that constitutes the cam interlocking mechanism 150, making it possible to achieve miniaturization, a reduction in the number of parts, and an increase in holding torque.

[0027] Moreover, the pillar portion 163b extending in the axial direction, which partitions the first cam accommodating portion 162a in which the first cam 130a is accommodated and the second cam accommodating portion 162b in which the second cam 130b adjacent in the meshing direction of the first cam 130a is accommodated, has a position restricting portion 165 formed in a tapered shape so as to become wider toward the front at the front end portion in the cage ring movement direction. The position restricting portion 165 is formed to have the same shape as the cam attitude changing portion 164.

[0028] In this way, the first cam accommodating portion 162a and the second cam accommodating portion 162b are not simple rectangular windows, but are formed as irregularly shaped windows whose opening width narrows at both axial ends. This makes it possible to release slight jamming caused by manufacturing errors with a small thrust, and by appropriately changing the opening shapes of the first cam accommodating portion 162a and the second cam accommodating portion 162b, it is possible to realize more operation modes and switch between them.

[0029] 7A and 7B, the outer race side cage ring 170 includes a cylindrical main body portion 171 extending in the axial direction, and an annular flange portion 175 that functions as a jamming prevention portion and is provided at one axial end of the main body portion 171. Reference numeral 177 in Fig. 7A and 7B denotes a fitting portion that is fitted into the outer race 120.

[0030] The main body 171 has, for example, a plurality of rectangular window portions arranged at equal intervals p2 in the circumferential direction. In the embodiment, the window portions are arranged at equal intervals in the circumferential direction, but they may be arranged with some regularity or randomly. Each window portion is divided into two cam accommodating portions by a pillar portion 173 extending in the axial direction, one of which is a first cam accommodating portion 172a that accommodates the first cam 130a, and the other is a second cam accommodating portion 172b that accommodates the second cam 130b. The first cam accommodating portion 172a and the second cam accommodating portion 172b are formed by rectangular windows with a uniform opening width in the axial direction.

[0031] The flange portion 175 is curved radially inwardly in an arc shape so that the radial dimension becomes smaller as it extends axially outward. As shown in Figures 8 and 9, the flange portion 175 is formed with a fitting portion 176 that is configured to be able to fit with the flange portion 166 of the inner cage ring 160 when the inner cage ring 160 is moved to an operating position that sets the operating mode of the cam clutch 100 to the bidirectional free mode.

[0032] 10, the inner surfaces of the mating portions 176 facing each other in the circumferential direction are tapered so that the distance between them increases toward the rear in the cage ring movement direction. This makes it possible to maintain the phase of the circumferential positions of the corresponding cam receiving portions of the inner cage ring 160 and the outer cage ring 170 in a state in which the engagement surfaces of the cams are separated from the raceway surface 111 of the inner ring 110 and / or the raceway surface 121 of the outer ring 120 when the operation mode of the cam clutch 100 is set to the free mode. This makes it possible to prevent the cams from accidentally getting caught, and also makes it possible to adjust the degree of freedom of the phase difference between the circumferential positions of the cam receiving portions of the inner cage ring 160 and the corresponding cam receiving portions of the outer cage ring 170 by adjusting the fit.

[0033] In the above, the first cam 130a in this embodiment is configured to have a constricted portion 131 in the radial center in a plan view and to have a generally gourd-like shape as shown in Fig. 11. In Fig. 11, the solid arrow indicates the meshing direction of the first cam 130a, and the hollow arrow indicates the disengagement direction of the first cam 130a.

[0034] The leg portion 132 on the inner race side of the constricted portion 131 in the radial direction has an arc-shaped inner race side engagement surface 133, and both side surfaces 134a, 134b which smoothly continue into the inner race side engagement surface 133 and contact the inner race side cage ring 160 are formed as curved surfaces along an arc having a common center point. Further, the head portion 135 on the outer race side of the constricted portion 131 in the radial direction has an outer race side engagement surface 136, and both side surfaces 137a, 137b which smoothly continue into the outer race side engagement surface 136 and contact the outer race side cage ring 170 are formed as curved surfaces along an arc having a common center point. As a result, even if the posture of the first cam 130a changes, the size of the gap between the first cam receiving portion 162a of the inner cage ring 160 and the first cam 130a and the size of the gap between the first cam receiving portion 172a of the outer cage ring 170 and the first cam 130a do not change, and high interlocking can be obtained. In the cam shown in Fig. 11, both side surfaces 134a, 134b of the leg portion 132 are formed as curved surfaces along a common arc, but it is sufficient that both side surfaces 134a, 134b are formed by concentric arcs. The same applies to both side surfaces 137a, 137b of the head portion 135. As described above, the second cam 130b is an inverted version of the first cam 130a, and has the same shape as the first cam 130a.

[0035] The operation of the cam clutch 100 of this embodiment will now be described. First, when the cam clutch 100 is held in a bidirectional lock mode in which relative rotational movement in both directions between the inner ring 110 and the outer ring 120 is prohibited, as shown in Fig. 12(a), both the first cam 130a and the second cam 130b maintain an engagement standby state so that engagement with the inner ring 110 and the outer ring 120 is immediately initiated by torque acting on the inner ring 110 or the outer ring 120. Note that in Fig. 12(a), for the sake of convenience, the raceway surface 111 of the inner ring 110 and the raceway surface 121 of the outer ring 120 are shown as parallel planes.

[0036] For example, as shown in Fig. 12(b), when the inner ring 110 is driven to rotate in the forward direction (indicated by the hollow arrow), the first cam 130a rotates so as to tilt in the meshing direction. With the tilt of the first cam 130a, the inner ring side cage ring 160 is pressed by the leg portion 132 of the first cam 130a and rotates in the forward direction, and the outer ring side cage ring 170 is pressed by the head portion 135 of the first cam 130a and rotates in the reverse direction. With the rotation of the inner ring side cage ring 160 and the outer ring side cage ring 170, the second cam 130b rotates so as to tilt in the meshing release direction, and the outer ring side engagement surface 136 of the second cam 130b is separated from the raceway surface 121 of the outer ring 120.

[0037] When the torque on the inner ring 110 is removed, the first cam 130a rotates so as to tilt in the meshing release direction and transitions to a meshing standby state. At this time, the second cam 130b rotates so as to tilt in the meshing direction, but since the outer ring side engagement surface 136 of the second cam 130b is separated from the raceway surface 121 of the outer ring 120 when the first cam 130a meshes, the second cam 130b is prevented from meshing with the inner ring 110 and the outer ring 120 until the meshing of the first cam 130a is released, and this allows all of the first cam 130a and the second cam 130b to be reliably transitioned to the meshing standby state.

[0038] On the other hand, when the inner race 110 is driven to rotate in the reverse direction, the second cam 130b rotates so as to tilt in the meshing direction, and the inner race side cage ring 160 and the outer race side cage ring 170 rotate in accordance with the tilt of the second cam 130b. Due to the rotation of the inner race side cage ring 160 and the outer race side cage ring 170, the first cam 130a rotates so as to tilt in the meshing release direction, and the outer race side engagement surface 136 of the first cam 130a is separated from the raceway surface 121 of the outer race 120. When the torque applied to the inner ring 110 is removed, the second cam 130b rotates so as to incline in the meshing release direction. The first cam 130a does not mesh with the inner ring 110 and the outer ring 120 until the meshing of the second cam 130b is released, and therefore, all of the first cam 130a and the second cam 130b can be reliably shifted to the meshing standby state.

[0039] In this manner, by linking the respective rotational movements of the first cam 130a and the second cam 130b by the cam linkage mechanism 150, smooth movement can be achieved without causing jamming.

[0040] Next, the operation of switching the operation mode of the cam clutch 100 will be described. When the cam clutch 100 is held in a bidirectional lock mode in which relative rotational movement in both directions between the inner ring 110 and the outer ring 120 is prohibited, as shown in FIG. 13A, the position control portion 165 of the inner ring side cage ring 160 is positioned between the first cam 130a and the second cam 130b adjacent to the first cam 130a in the meshing direction, and the phase of the circumferential position of each cam accommodating portion of the inner ring side cage ring 160 and the outer ring side cage ring 170 is sized so that the first cam 130a and the second cam 130b are held in a meshing standby state.

[0041] 13B, when the inner cage ring 160 is moved in the axial direction, the cam position-changing portion 164 of the inner cage ring 160 is positioned between the first cam 130a and the second cam 130b adjacent to the first cam 130a in the meshing disengagement direction, and the flange portion 166 of the inner cage ring 160 is engaged with the engagement portion 176 of the outer cage ring 170. At this time, due to the action of the tapered surface of the cam position-changing portion 164, the first cam 130a and the second cam 130b are rotated so as to incline in the meshing disengagement direction, and the outer ring side engagement surface 136 of the first cam 130a and the outer ring side engagement surface 136 of the second cam 130b are separated from the raceway surface 121 of the outer ring 120. In this state, the phase of the circumferential position of each cam accommodating portion of the inner ring side cage ring 160 and the outer ring side cage ring 170 is sized to maintain the outer ring side engagement surface 136 of the first cam 130a and the outer ring side engagement surface 136 of the second cam 130b spaced apart from the orbital surface 121 of the outer ring 120, thereby restricting the first cam 130a and the second cam 130b from rotating so as to tilt in the meshing direction.

[0042] In this manner, by moving the inner cage ring 160 in the axial direction, the operation mode of the cam clutch 100 is switched from the bidirectional lock mode to the free mode.

[0043] In the above embodiment, the cam clutch is configured to be switchable between a bidirectional lock mode and a free mode. However, by appropriately changing the shape of the opening of the cam housing in the inner cage ring, a configuration compatible with three modes including a one-way lock mode may be formed, or by making the shape of the opening of the cam housing in the outer cage ring a different shape and appropriately changing the way the cage ring is moved, a configuration compatible with four modes may be formed. For example, the following shows a cam linkage mechanism using two cage rings that enables a cam clutch that supports three modes, including a one-way lock mode.

[0044] 14, the inner cage ring 260 has a cylindrical main body 261 having a plurality of cam housing portions arranged with regularity in the circumferential direction, and a flange 266 extending radially outward from the rear side end of the main body 261 in the cage ring movement direction (axial direction). The flanges 266 are provided at two circumferential positions facing each other with the rotation axis in between, extending in the circumferential direction. The flange portion 266 is formed in a two-step shape, and has a first step portion 267a having a uniform axial dimension in the circumferential direction, and a second step portion 267b having a uniform axial dimension in the circumferential direction and smaller in axial dimension than the first step portion 267a.

[0045] A pillar portion 263a extending in the axial direction that divides the first cam accommodating portion 262a in which the first cam 130a is accommodated and the second cam accommodating portion 262b in which the second cam 130b adjacent to the first cam 130a in the meshing disengagement direction is accommodated has a cam position changing portion 264 at its rear end in the cage ring movement direction. The cam position changing portion 264 is formed asymmetrically with respect to the center of the pillar portion 263a.

[0046] The cam posture changing portion 264 has a first tapered portion 264a, the side edge of which on the second cam accommodating portion 262b side is formed in a straight line relative to the center of the pillar portion 263a so that it is continuous with the side edge of the pillar portion 263a, and the portion on the first cam accommodating portion 262a side is formed in a tapered shape so that it becomes wider toward the rear in the direction of movement of the cage ring, and a second tapered portion 264b, the side edge of which on the first cam accommodating portion 262a side is formed in a straight line relative to the center of the pillar portion 263a so that it is continuous with the tapered surface of the first tapered portion 264a, and the side edge on the second cam accommodating portion 262b side is formed in a tapered shape so that it becomes wider toward the rear in the direction of movement of the cage ring.

[0047] Furthermore, the axially extending pillar portion 263b, which separates the first cam accommodating portion 262a in which the first cam 130a is accommodated and the second cam accommodating portion 262b in which the second cam 130b adjacent in the meshing direction of the first cam 130a is accommodated, has a position restricting portion 265 at its end on the front side in the cage ring movement direction. The position restricting portion 265 has substantially the same shape as the cam attitude changing portion 264, and has a first tapered portion 265a and a second tapered portion 265b. The tapered surface of the first tapered portion 265a of the position restricting portion 265 is positioned on the second cam accommodating portion 262b side, Second tapered portion 265b The tapered surface is formed so as to be positioned on the first cam accommodating portion 262a side.

[0048] In this way, the first cam accommodating portion 262a and the second cam accommodating portion 262b are not formed as simple rectangular windows, but as irregularly shaped windows whose opening widths narrow at both axial ends.

[0049] As shown in FIG. 15A, the outer ring side cage ring 270 has a configuration similar to that shown in FIGS. 7A and 7B, except that a notch is formed in one axial side end of the main body 271 to form an engagement portion 276 that is configured to be able to engage with the flange portion 266 of the inner ring side cage ring 260.

[0050] In such a cam interlocking mechanism, when the cam clutch 100 is held in a bidirectional lock mode in which relative rotational movement in both directions between the inner ring 110 and the outer ring 120 is prohibited, as shown in FIG. 15A, the position control portion 265 of the inner ring side cage ring 260 is positioned between the first cam 130a and the second cam 130b adjacent to the first cam 130a in the meshing direction, and the phase of the circumferential position of each cam accommodating portion of the inner ring side cage ring 260 and the outer ring side cage ring 270 is sized so that the first cam 130a and the second cam 130b are held in a meshing standby state.

[0051] 15B, when the inner cage ring 260 is moved axially forward and the first step portion 267a of the flange portion 266 of the inner cage ring 260 is fitted into the fitting portion 276 of the outer cage ring 270, the first tapered portion 264a of the cam position-changing portion 264 of the inner cage ring 260 is positioned between the first cam 130a and the second cam 130b adjacent to the first cam 130a in the meshing disengagement direction. At this time, the first cam 130a is rotated so as to tilt in the meshing disengagement direction by the action of the tapered surface of the first tapered portion 264a of the cam position-changing portion 264, and the outer ring side engagement surface 136 of the first cam 130a is separated from the raceway surface 121 of the outer ring 120. The second cam 130b is held in a meshing standby state. In this state, the phase of the circumferential position of each cam accommodating portion of the inner ring side cage ring 260 and the outer ring side cage ring 270 is sized to maintain the outer ring side engagement surface 136 of the first cam 130a spaced apart from the raceway surface 121 of the outer ring 120, so that the first cam 130a is restricted from rotating so as to tilt in the meshing direction, and the operating mode of the cam clutch is switched to the one-way lock mode.

[0052] 15C, when the inner cage ring 260 is further moved axially forward until the second step portion 267b of the flange portion 266 of the inner cage ring 260 is fitted into the fitting portion 276 of the outer cage ring 270, the second tapered portion 264b of the cam position-changing portion 264 of the inner cage ring 260 is positioned between the first cam 130a and the second cam 130b adjacent to the first cam 130a in the disengagement direction. At this time, the second cam 130b is rotated so as to tilt in the disengagement direction by the action of the tapered surface of the second tapered portion 264b of the cam position-changing portion 264, and the outer engagement surface 136 of the second cam 130b is separated from the raceway surface 121 of the outer ring 120. First cam 130a In this state, the outer ring side engagement surface 136 is maintained in a state spaced apart from the raceway surface 121 of the outer ring 120 . In this state, the phase of the circumferential position of each cam housing part of the inner cage ring 260 and the outer cage ring 270 is sized so that the outer ring side engagement surface 136 of the first cam 130a and the outer ring side engagement surface 136 of the second cam 130b are maintained in a state separated from the raceway surface 121 of the outer ring 120. Therefore, the first cam 130a and the second cam 130b are restricted from rotating so as to tilt in the meshing direction, and the operation mode of the cam clutch is switched to the bidirectional free mode.

[0053] In this way, by appropriately changing the shape of the opening of the cam housing portion and moving the inner cage ring 260 in the axial direction in stages, it becomes possible to switch between three operation modes.

[0054] 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 described in the claims. In the above embodiment, the cam interlocking mechanism is configured with a cage ring, but the cam interlocking mechanism may be configured to interlock the tilting motion of the first cam and the second cam. Furthermore, when the cam interlocking mechanism is configured with a cage ring, the cam interlocking mechanism does not need to be configured with two cage rings, an inner cage ring and an outer cage ring, but may be configured with a single cage ring. In the above embodiment, a configuration has been described in which the operating mode is switched by axially moving the inner cage ring. However, the operating mode may also be switched by axially moving the outer cage ring, or by axially moving both the inner cage ring and the outer cage ring. Furthermore, in the above embodiment, a configuration was described in which the cam is tilted away from the outer wheel in the free mode, but the cam clutch of the present invention may also be configured to tilt the cam away from the inner wheel. [Explanation of symbols]

[0055] 100 ··· Cam clutch 110... Inner circle 111 ... Raceway surface 120 Outer ring 121 ... raceway surface 130a First cam 130b Second cam 131 ... Narrow part 132 ... leg part 133 Inner ring side engagement surface 134a Side 134b... side 135... Head part 136 Outer ring side engagement surface 137a... side 137b... side 140 .... Actuating means 141 Circular ring 142... Connecting part 143 Pressing section 145 Cam housing 150 ··· Interlocking mechanism 160, 260 Inner cage ring 161, 261... Main body 162a, 262a First cam housing section 162b, 262b Second cam housing section 163a,263a... Column part 163b,263b ··· Pillar part 164, 264 Cam position change section 264a First taper section 264b Second taper section 165 ,265 ... position regulation part 265a ··· First taper section 265b Second taper section 166,266... ​​flange 267a... 1st stage section 267b... 2nd stage section 170, 270 Outer cage ring 171,271 ··· Main body 172a First cam housing portion 172b Second cam housing 173 · · Column part 175 ··· flange 176 ,276 ··· Fitting part 177 .... Fitting part

Claims

1. A cam clutch comprising an inner ring and an outer ring that are coaxially arranged so as to be rotatable relative to each other, a plurality of cams that are spaced apart in a circumferential direction between the inner ring and the outer ring, and a biasing means that biases each of the plurality of cams so as to contact the inner ring and the outer ring, the plurality of cams include a first cam and a second cam that mesh with the inner ring and the outer ring in different directions, a cam interlocking mechanism that interlocks and tilts each of the plurality of cams, the cam interlocking mechanism is configured to tilt the second cam in a disengagement direction in association with tilting of the first cam in the meshing direction, thereby separating the engagement surface of the second cam from the raceway surface of the inner ring and / or the raceway surface of the outer ring, the cam interlocking mechanism includes a cylindrical inner race side cage ring and a cylindrical outer race side cage ring that are coaxially provided between the inner race and the outer race and are rotatable together with the inner race or the outer race, the inner cage ring and the outer cage ring rotate in association with the inclination of the first cam in the engagement direction, thereby inclining the second cam in the disengagement direction, at least one or both of the inner cage ring and the outer cage ring are provided to be movable in an axial direction independently of rotation of the inner ring and the outer ring, a lock mode that prohibits relative rotational movement between the outer ring and the inner ring in either one or both of the forward and reverse directions, by axially moving at least one or both of the inner ring side cage ring and the outer ring side cage ring.

2. The first cam and the second cam are arranged on the same circumference, 2. The cam clutch according to claim 1, wherein a pillar portion of one of the inner cage ring and the outer cage ring, which partitions a first cam accommodating portion for holding the first cam and a second cam accommodating portion adjacent to the first cam accommodating portion in a direction in which the first cam is released from engagement and for holding the second cam, has a cam attitude changing portion at a rear end in the cage ring movement direction, which is tapered so as to become wider toward the rear.

3. One of the inner cage ring and the outer cage ring has a flange portion extending radially outward at a rear end portion in the cage ring movement direction, 3. The cam clutch according to claim 1, wherein the other of the inner cage ring and the outer cage ring has a fitting portion configured to be able to fit with the flange portion.

4. A cam clutch as described in claim 3, characterized in that the inner surfaces facing the mating portion in the circumferential direction are tapered so that the separation distance increases toward the rear in the direction of cage ring movement.

5. The first cam and the second cam have a generally gourd-shaped configuration having a narrowed portion in the radial center, both side surfaces of the inner ring side portion of the narrowed portion that are in contact with the inner ring side cage ring are formed as curved surfaces along a circular arc having a common center point, 5. A cam clutch as claimed in claim 1, wherein both side surfaces of the outer ring side portion of the constricted portion that contact the outer ring side cage ring are formed as curved surfaces along an arc having a common center point.

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