JP5259428B2 - Roller type one-way clutch - Google Patents

Description

  The present invention relates to a roller type one-way clutch used as a component for torque transmission, backstop, etc. in a drive device such as an automobile or an industrial machine.

Generally, a roller type one-way clutch is arranged between an outer ring, an inner ring arranged concentrically with the outer ring, an outer ring of the inner ring and an inner cam surface of the outer ring, and a plurality of rollers for transmitting torque, It consists of a spring that contacts the idle side.
In such a configuration, the one-way clutch rotates the inner ring in only one direction with respect to the outer ring by a cam mechanism including a roller and a cam surface. That is, the inner ring is idled in one direction with respect to the outer ring, and rotational torque is applied to the outer ring via the cam mechanism only in the opposite direction.
In general, a roller type one-way clutch needs to prevent a roller serving as a torque transmission member, a spring for urging the roller, and the like from dropping off from a pocket in an axial direction and a radial direction in order to obtain a reliable engagement.
In particular, in a roller type one-way clutch for a motorcycle, since the number of rollers is small (for example, three or six), the design torque capacity may not be ensured unless the respective rollers are engaged with each other.
Also, a design is required to ensure that the rollers mesh with each other even during sudden meshing. For this reason, durability and operation stability of the spring that biases the roller are required.
Japanese Patent Laid-Open No. 09-210098 discloses a configuration in which the end of the spring is engaged with the curved protrusion at the end of the pocket so that the spring operates stably with respect to the roller. However, Japanese Patent Application Laid-Open No. 09-210098 does not disclose prevention of the roller from falling off, and since it supports only one end, stable operation of the spring is not sufficient. In addition, there is a problem that the spring easily comes off during assembly.

Therefore, the object of the present invention is to prevent the spring from being worn and deformed even under severe use conditions such as high vibration, cryogenic environment and centrifugal force due to rotation, and at the same time, it is easy in operability during assembly. It is to provide a roller type one-way clutch.
Another object of the present invention is to provide a roller type one-way clutch in which the rollers and springs can be prevented from falling off in the axial direction and the radial direction, and the rollers can be surely engaged.
In order to achieve the above object, the roller type one-way clutch of the present invention is:
An annular outer ring formed with a pocket having a cam surface on the inner periphery;
An inner ring that is spaced radially inward from the outer ring, is concentrically disposed so as to be relatively rotatable, and has an annular outer raceway surface;
A plurality of rollers disposed in the pocket, engaged with the cam surface, and transmitting torque between the outer ring and the inner ring;
A spring disposed in the pocket and biasing the roller in a meshing direction with a cam surface;
A cage that includes an inner diameter portion, first and second flange portions that extend in the outer diameter direction from both axial ends of the inner diameter portion and sandwich the outer ring, and holds the plurality of rollers;
And is provided with a support portion that extends in the axial direction from the first or second flange portion and supports the spring in the radial direction.
According to the present invention, the following effects can be obtained.
Since the support portion that supports the spring in the radial direction is provided in the cage, the operation of the spring is stabilized, and the axis of the spring coincides with the center of the roller, thereby preventing misalignment. As a result, wear and deformation of the spring can be prevented, and operability at the time of assembly is facilitated.
Since the retainer and the plate stopped by the retainer can prevent the rollers and springs from falling off in the axial direction and the radial direction, all the rollers can be surely engaged even in an environmental condition with a large vibration such as a two-wheeled vehicle.
Further, since the rollers and springs can be prevented from falling off in the axial direction and the radial direction, all the rollers can be surely engaged even in an environmental condition with a large vibration such as a two-wheeled vehicle.

FIG. 1 is a front view showing a roller type one-way clutch according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line A-O-A in FIG.
FIG. 3 is a front view of FIG. 1 viewed from the back side.
4 is a cross-sectional view taken along line B-O-B in FIG.
FIG. 5 is a front view of a spring used in the embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings. In addition, it is needless to say that the embodiments described below are intended to illustrate the present invention and not to limit the present invention. In the drawings, the same parts are denoted by the same reference numerals.
FIG. 1 is a front view showing a roller type one-way clutch according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line A-O-A in FIG. The roller type one-way clutch 30 is concentric with an annular outer ring 1 having a pocket 4 formed as a recess having a cam surface 12 on the inner periphery, and is radially spaced from the outer ring 1 on the radially inner side. Between the outer ring raceway surface 11 and the cam surface 12 disposed in the pocket 4 and the inner ring 2 having an annular outer raceway surface 11 (not shown in FIG. 1 and indicated by an imaginary line in FIG. 2). It comprises a plurality of rollers 3 for transmitting torque, a cage 6 for holding the plurality of rollers 3 and a first flange portion 9.
Further, the first flange portion 9 of the cage 6 has a rectangular plate 25 and a section 21 which are two kinds of protruding pieces extending from the first flange portion 9, and the rectangular plate 25 includes a support portion 16. ing. The support portion 16 supports the spring 5 in the radial direction.
The first flange portion 9 is provided with a long window 15 penetrating in the axial direction corresponding to the position of the pocket 4. The window 15 functions as a discharge hole for discharging foreign matter in the pocket 4 generated due to the engagement of the cam surface 12 and the roller 3 to the outside. Providing the window 15 can prevent malfunction due to dust accumulation. The first flange portion 9 further includes a through hole 20 provided corresponding to a stepped bolt hole 8 for fixing the outer ring 1 to a generator described later.
FIG. 2 is a cross-sectional view taken along the line A-O-A in FIG. 1 and shows a state of the support portion 16 that supports the spring 5. A protruding rectangular plate 25 indicated by an imaginary line indicates a portion that is bent and becomes the support portion 16.
FIG. 3 is a front view of the roller type one-way clutch 30 of FIG. 1 viewed from the back surface (opposite side).
As shown in FIG. 3, the roller type one-way clutch 30 includes a cage 6 that holds a plurality of rollers 3 and a second flange portion 10 (side plate) in the shape of an axial retaining plate. The second flange portion 10 may be a side plate.
Three pockets 4 provided in the outer ring 1 are provided at equal intervals in the circumferential direction. Further, stepped bolt holes 8 that are used to fix the outer ring 1 to an input / output member (not shown) and the like and penetrate in the axial direction are also provided at three locations equally in the circumferential direction. As shown in FIG. 3, the pockets 4 and the bolt holes 8 are alternately arranged at equal intervals. Needless to say, the number of pockets 4 can be set to a plurality of pockets such as 3 to 6, for example, according to the required torque.
4 is a cross-sectional view taken along line B-O-B in FIG. The cage 6 that holds the roller 3 includes an inner diameter portion 14, and a first flange portion 9 and a second flange portion 10 that respectively extend in the outer diameter direction from the axial end portion of the inner diameter portion 14. . The outer ring 1 is sandwiched between the first flange portion 9 and the second flange portion 10. As a result, the cage 6 is restricted from moving in the axial direction. In FIG. 3, the second flange portion 10 is partially broken so that the inside of the pocket 4 can be seen.
A step portion 22 is provided in the inner diameter portion of the outer ring, and the section 21 extending from the cage 6 and the flange portion 10 are accommodated in the step portion 22 so that interference with the mating member can be avoided. The axial end face 23 is provided with grooves 40 that penetrate in the radial direction at three locations equally in the circumferential direction. The groove 40 is provided for supplying or discharging the lubricating oil to the roller clutch portion.
Since the outer diameter of the second flange portion 10 is smaller than the outer diameter of the pocket 4, as is apparent from FIG. 1, a part of the pocket 4 is exposed in a window shape from the outer peripheral edge of the second flange portion 10. ing. For this reason, the foreign matter in the pocket 4 generated by the engagement between the cam surface 12 and the roller 3 is discharged from the window portion.
The cage 6 is attached to the outer ring 1 as follows. First, a section 21 of a retainer 6 of a plate-like member made by pressing from a single steel plate or the like is bent into an L shape, the section 21 is inserted into the inner peripheral side of the outer ring 1, and the retainer 6 is moved to one side. After the roller 3 and the spring 5 are arranged in the pocket 4 in the state of being set on the side, the protruding rectangular plate 25 is bent into an L shape to form a support portion 16 that holds the spring 5 in the radial direction, and extends in a band shape. The section 21 is bent into a U shape to form the inner diameter portion 14 and the second flange portion 10 is sandwiched. That is, it is possible to prevent the cage 6 from being pulled out in the axial direction by bending the cage 6 into a U-shape and fixing the second flange portion 10.
The second flange portion 10 is held by a section 21, and the spring 5 is supported in the radial direction by a support portion 16 extending from the cage 6. For this reason, the urging | biasing force with respect to the roller 3 of the spring 5 is obtained stably.
FIG. 5 is a front view of a spring used in the embodiment of the present invention. The spring 5 that is an accordion spring includes a contact portion 31 that contacts the roller 3, a plurality of bent portions 32 that are continuous from the contact portion 31, a vertical portion 33 that extends from the bent portion 32, and a vertical portion 33. It consists of a tab 34 bent at a substantially right angle.
The tab 34 is sandwiched between the first flange portion 9 or the second flange portion 10 and the outer ring 1. Accordingly, since the spring 5 is supported in a fixed state by the tab 34 which is one end thereof, and is supported in the radial direction by the support portion 16 of the cage 6, a stable urging force can be applied to the roller 3. it can. Therefore, it can contribute to the stable operation of the roller type one-way clutch.

  The present invention is used as a component such as torque transmission and backstop in a drive device such as an automobile or an industrial machine, but is particularly effective when used for a two-wheeled passenger car.

Claims (4)

An annular outer ring formed with a pocket having a cam surface on the inner periphery;
An inner ring that is spaced radially inward from the outer ring, is concentrically disposed so as to be relatively rotatable, and has an annular outer raceway surface;
A plurality of rollers disposed in the pocket, engaged with the cam surface, and transmitting torque between the outer ring and the inner ring;
A spring disposed in the pocket and biasing the roller in a meshing direction with a cam surface;
A cage that includes an inner diameter portion, first and second flange portions that extend in the outer diameter direction from both axial ends of the inner diameter portion and sandwich the outer ring, and holds the plurality of rollers;
The first flange portion includes a plate-like support portion that extends in the axial direction and supports the spring in the radial direction, and a section that holds the second flange portion, and the spring includes a tab. The roller type one-way clutch is characterized in that the tab is sandwiched between the first flange portion or the second flange portion and the outer ring .   The roller type one-way clutch according to claim 1, wherein the spring is an accordion spring.   The roller type one-way clutch according to claim 1 or 2, wherein the retainer is provided with a discharge hole for discharging foreign matter in the first flange portion.   The roller type one-way clutch according to any one of claims 1 to 3, wherein the retainer is molded from a plate-like member by a press.

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