JPH041380Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention can be made smaller by reducing its width by housing the cam body in a retainer ring made of a bearing material that can hold the inner ring and the outer ring concentrically. This invention relates to a one-way dog clutch that can reduce costs.

One-way mesh clutches are often used in which a cam body is disposed between an inner ring and an outer ring, and the cam body is wedged between the inner ring and the outer ring when the cam body rotates relative to the rising direction.

In such a one-way mesh clutch, it is necessary to hold the inner ring and the outer ring concentrically and with a predetermined gap between them so that the cam body can rise and tilt.
Conventionally, as shown in FIG. 5, for example, a ball bearing c is interposed between a cylindrical inner ring a and an outer ring b on both sides, or a relatively long boss is provided at one end of the outer ring b, as shown in FIG. A portion d is provided protrudingly, and the boss portion d
A rotating shaft f passing through the inner ring a was formed to be slidably and rotatably inserted into a sliding bearing e which was installed in the slide bearing e. Therefore, in any case, the width of the one-way mesh clutch is increased by the length of the ball bearing c and the bearing e in addition to the length of the cam body f, which results in a space required for installation and an increase in weight. This increase also led to an increase in production costs. In particular, in the case shown in FIG. 6, the inner ring a and the outer ring b are held in a cantilever shape, and a large width is required to improve centering accuracy. In addition, in the case shown in FIG. 5, since the thickness of the ball bearing c is larger than the height of the cam body f, it is necessary to provide stepped portions h of the inner ring a and outer ring b, and the sixth The one shown in the figure also has the boss part d protruding, etc.
The shape becomes complicated and the processing time increases.

The present invention provides a one-way meshing clutch (hereinafter referred to as a clutch) that can solve the above problems by interposing a retainer ring made of a bearing material between the inner ring and the outer ring and capable of accommodating the cam body. An embodiment thereof will be described below with reference to the drawings.

In the figure, a clutch 1 of the present invention has a retainer ring 5 that can accommodate a cam body 4 interposed between an inner ring 2 and an outer ring 3, and the inner ring 2 and outer ring 3 are almost the same in this embodiment. It has a short cylindrical shape, is made of bearing steel, etc., and the outer circumferential surface 2a of the inner ring 2 and the inner circumferential surface 3a of the outer ring 3 facing each other are made into a perfect circular mirror surface and hardened, and both ends thereof are hardened. A circumferential groove 9 for attaching the retaining ring 7 is recessed, and the gap g between the opposing surfaces 2a and 3a is set equal to the rising height of the cam body 4 during operation.

The retainer ring 5 is a cylindrical body inserted into the gap g, and its inner surface 5a and outer surface 5b are in relatively tight sliding contact with the outer and inner peripheries 2a and 3a, so that
The outer circumferential surface 2a of the inner ring 2 and the inner circumferential surface 3a of the outer ring 3 are supported concentrically, and the retainer ring 5
These include various bearing alloys such as Kelmet, Pavit metal, and white metal, synthetic resins, and powder metallurgy, as well as Oiles bearing materials made by impregnating and mixing oil, graphite, etc. into porous materials such as metals or synthetic resins. , made of various materials with wear resistance and compression resistance. Further, the retainer ring 5 is formed with, for example, six notches 11 extending in parallel from one side thereof to the other side. In this embodiment, the notch 11 has an arcuate side surface and its center is located above the retainer ring 5, so that the outer surface 5b of the retainer ring 5 is cut out to a larger extent than the inner surface 5a. Inner surface 5a, outer surface 5
an outer circumferential groove 13 is formed on the outer surface 5b, passing through approximately the center of the notch 11 and having a depth exceeding approximately half of the plate thickness of the retainer ring 5.

The cam body 4 is non-circular and has a generally rice ball-shaped cross section, and can contact the outer and inner circumferential surfaces 2a and 3a at a small angle α with respect to the radial center line A of the clutch 1. , 4b rises in the direction in which the inner ring 2 and outer ring 3 rotate relative to each other, so that the cam body 4 wedges the inner ring 2 and the outer ring 3 in the shape of a peg and engages them. Further, the cam body 4 is formed with a cutout groove 15 that can be aligned with the outer circumferential groove 13, and the cutout groove 15 is formed in the contact points 4a, 4b.
It has a bottom surface 16 that is approximately perpendicular to the line segment connecting the
By housing the cam body 4 in the notch 11, the bottom surface 16 is inclined, and the rising corner portion 16a of the bottom surface 16 extends beyond the bottom surface 17 of the outer circumferential groove 13 and projects outward. Therefore, the endless coil spring 19 whose free length is smaller than the circumferential length of the bottom surface 17 of the outer circumferential groove 13 is passed through the outer circumferential groove 13 into the notched groove 15.
When the coil spring 19 is inserted into and tensioned, the cam body 4 is tilted and biased toward the rising side by pushing down the corner portion 16a.

However, in the clutch 1 of the present invention, the cam body 4 is inserted into each notch 11 of the retainer ring 5, the coil spring 19 is wound around the outer peripheral groove 13 and the notch groove 15, and the cam body 4 is rotated at a small angle α or more. The retainer ring 5 and the cam body 4 are inserted between the inner ring 2 and the outer ring 3 while being inclined to the side, and the retaining ring 7 is attached to the circumferential groove 9 to prevent the retainer ring 5 and the cam body 4 from coming off. The retainer ring 5 has an inner surface 5a and an outer surface 5b that can be in sliding contact with the outer and inner peripheral surfaces 2a and 3a, and since the retainer ring 5 is made of a bearing material, the inner ring 2 and the outer ring 3 are coaxially supported by bearings. Therefore, the inner ring 2 is held by the outer ring 3 such that it can rotate relative to the outer ring 3. The cam body 4 crosses the inner surface 5a and outer surface 5b of the retainer ring 5 and contacts the opposing surfaces 2a and 3a at a small angle α, so that the inner ring 2 and the outer ring 3 are formed on the rising side of the line segment connecting the contact points 4a and 4b. When the two rotate relative to each other, the two are wedged and engaged, while when the two rotate relative to each other in the opposite direction, the wedge is released, allowing free rotation. The coil spring 19 urges the cam body 4 toward the rising side, so that the inner ring 2 and the outer ring 3 can be immediately connected by relative rotation in the meshing direction. Further, as in the embodiment described above, the notch 11 has a cylindrical shape and the inner surface 5a is narrow, so that the cam body 4 can be held in the notch 11 and the retainer ring 5 can be prevented from falling out when attached. By making the notch 11 and the cam body 4 substantially the same shape, the free movement of the cam body 4 is reduced and operation is ensured.

As mentioned above, the clutch of the present invention uses a retainer ring interposed between the outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring to hold them concentrically, and the cam body is attached to the notched groove of the retainer ring. , the inner ring and the outer ring are concentric with the outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring, without adding or separately installing ball bearings, sliding bearings, etc., as in the conventional example shown in Figs. 5 and 6 above. As a result, the width can be reduced, ease of installation can be improved, and weight reduction can be achieved. Furthermore, by simplifying the structure of the inner ring and outer ring and making assembly easier than conventional ones, it is possible to significantly reduce costs.

In addition, in the clutch of the present invention, the notch 11 is partially illustrated by the dashed line in FIG.
It is also possible to provide as many as possible without being continuous with each other, and even in that case, since the retainer ring 5 is made of a bearing material, the inner ring 2 and the outer ring 3 are coaxially supported by bearings, and they can rotate relative to each other. The number of cam bodies 5 can be increased, and the durability and wear resistance of the clutch can be improved. Furthermore, the clutch of the present invention can be configured to prevent the lubricant from flowing out by using a seal ring that can seal the gap g, and the retainer ring 5 has a seal ring that can seal the gap g.
can be fixed in advance to one side. Furthermore, an appropriate leaf spring or the like can be used instead of the coil spring 19, and the cam body may have a rice ball shape in cross section, or
Various shapes such as an elliptical shape can be adopted.

[Brief explanation of drawings]

Figure 1 is a front view showing one embodiment of the present invention;
3 is a perspective view showing a retainer ring, FIG. 4 is an enlarged perspective view illustrating a cam body, and FIGS. 5 and 6 are sectional views showing a conventional example. 2...Inner ring, 2a...Outer circumferential surface, 3...Outer ring, 3
b...Inner peripheral surface, 4...Cam body, 5...Retainer ring, 5a...Inner surface, 5b...Outer surface, 11...Notch.

Claims (1)

[Scope of utility model registration request] The outer circumferential surface of an inner ring and the inner circumferential surface of an outer ring, each formed into a perfect circle, are arranged facing each other, and a cylindrical retainer ring made of a bearing material is interposed between the inner circumferential surface and the outer circumferential surface. The outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring are concentrically supported by a bearing, and the retainer ring is provided with a plurality of notches that communicate with the inner and outer surfaces thereof, and the outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring are provided in the notches. A one-way meshing clutch that accommodates a non-circular cam body that slides on the inner circumferential surface of the clutch and wedges the two against relative rotation in one direction.