JPH0596568U - One way clutch - Google Patents

Abstract

(57) [Summary] [Structure] In this one-way clutch A, a clutch unit U is arranged in a key groove portion 21 provided on the inner periphery of the insertion hole 2a of the housing 2. The clutch unit U includes a cylindrical roller 4, a cam forming body 5 having a cam surface 5b, and an elastic piece 6 in a holding member 3 fixed to the key groove portion 21. Cam surface 5
A wedge-shaped space K for sandwiching the cylindrical roller 4 is formed between b and the peripheral surface of the shaft 1. [Effect] Easy to process without complicated processing. If one set of clutch unit U is prepared, it can be adapted to a wide range of shaft diameter sizes.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a one-way clutch that transmits power by integrally rotating a shaft via a cylindrical roller.

[0002]

[Prior Art]

 Conventionally, as the above-mentioned one-way clutch, a plurality of recesses each having a cam surface formed at the bottom are provided on the circumference of the inner periphery of the outer ring through which the shaft is inserted. There was one with a cylindrical roller sliding on it. In this one-way clutch, by sandwiching the cylindrical roller in a wedge shape between the cam surface formed on the bottom surface of the recess and the outer peripheral surface of the shaft only in a predetermined rotation direction of the shaft, the relative rotation between the shaft and the outer ring is made. The rotation is regulated so that the shaft and the outer ring are integrally rotated to transmit power.

[0003]

[Problems to be solved by the device]

 By the way, in the above-mentioned one-way clutch, since the outer ring itself is formed with the recess having the cam surface, the outer ring and the cage adapted to the shafts having different shaft diameter sizes are provided. However, there was a problem that the shaft diameter size was not flexible.

Further, since the cam surface is machined on the bottom of the concave portion on the inner peripheral surface of the outer ring, it is difficult to machine. For this reason, the machining accuracy of the cam surface was poor, and rattling sometimes occurred when the clutch was disengaged. It is an object of the present invention to solve the above technical problems and to realize a one-way clutch that is small in size, can be applied to shafts of various shaft diameter sizes, and is easy to process.

[0005]

A one-way clutch according to claim 1 for achieving the above object is arranged around a shaft and transmits power by rotating integrally with the shaft via a cylindrical roller. The one-way clutch includes a housing having an insertion hole through which the shaft is inserted, the housing having a key groove portion formed on the inner periphery of the insertion hole, and a clutch unit fixed in the key groove portion. Is a metal member having a holding member having a holding space for holding the cylindrical roller, and a cam surface which is housed in the holding space and forms a wedge-shaped space for sandwiching the cylindrical roller between the peripheral surface of the shaft. The cam forming body is provided with an urging means which is provided in the holding space and urges the cylindrical roller toward the narrow side of the wedge-shaped space.

[0006]

[Action]

 When the shaft rotates with respect to the housing toward the narrower side of the wedge-shaped space, the cylindrical rollers accordingly enter into the narrower side of the wedge-shaped space and are pressed against the cam surface and the surface of the shaft. As a result, the shaft and the housing are integrally rotated through the cylindrical rollers, and power is transmitted. On the contrary, when the shaft rotates to the wider side of the wedge-shaped space with respect to the housing, the cylindrical roller moves to the wider side of the wedge-shaped space and weakens the contact force to the cam surface and the surface of the shaft. Rotation with respect to the housing is allowed.

Conventionally, the cam surface is directly formed inside the recess provided in the outer ring or the like, which makes it difficult to process. In the present invention, however, the housing is simply key groove processed. It is easy to process because it is necessary to apply. Further, if one set of the clutch unit having the cylindrical roller, the cam forming body and the urging means is prepared, the depth of the key groove portion can be set to a desired value and adapted to a wide range of shaft diameter sizes. be able to.

[0008]

Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments. FIG. 1 shows a one-way clutch according to an embodiment of the present invention. Referring to FIG. 1, the one-way clutch A includes an annular housing 2 arranged around the shaft 1 and a clutch unit U housed in a key groove portion 21 provided in the housing 2. .. The clutch unit U includes a holding member 3 fixed in the key groove portion 21, a cylindrical roller 4 for integrally rotating the shaft 1 and the housing 2, a cam forming body 5 having a cam surface 5b, and an urging force. A bifurcated elastic piece 6 is included as a means. The one-way clutch A is a member (not shown) rotatably attached to the housing 2 by integrally rotating the shaft 1 and the housing 2 in the P direction in FIG. 1 via the cylindrical roller 3. Power is transmitted between the shaft and the shaft 1.

The housing 2 is made of resin or metal and has an insertion hole 2 a through which the shaft 1 is inserted. On the inner periphery of the insertion hole 2a, the key groove portion 21 having a predetermined depth and having a substantially rectangular parallelepiped shape is provided. The holding member 3 has a box shape having upper and lower openings 3a and 3b, and is made of resin. The holding member 3 is press-fitted and fixed in the key groove portion 21 by appropriately setting the distance between the ends in the rotation direction and the distance between the inner walls of the key groove portion 21. The holding member 3 has a holding space 31 for holding the cylindrical roller 4 and the cam forming body 5 therein. The elastic piece 6 extending into the holding space 31 is integrally formed on one side wall of the holding member 3. A portion of the other side wall of the holding member 3 on a lower end side (a side closer to the shaft 1) in the drawing forms a jaw portion 3c for preventing the cylindrical roller 4 from falling off to the shaft 1 side. ..

The cam forming body 5 is made of a metal material such as a sintered material. The cam forming body 5 has a trapezoidal cross section as shown in FIG. 4, and its upper surface 5a is brought into contact with the bottom surface of the key groove portion 21 through the opening 3a of the holding member 3 as shown in FIG. Thus, the cam forming body 5 is positioned in the key groove portion 21 in the vertical direction in the drawing. Further, the lower surface of the cam forming body 5 is formed as a cam surface 5b for forming a wedge-shaped space K for sandwiching the cylindrical roller 4 with the peripheral surface of the shaft 1.

The above-mentioned bifurcated elastic piece 6 has a V-shape in plan view with reference to FIGS. 2 and 3. The elastic piece 6 urges the cylindrical roller 4 toward the narrow side of the wedge-shaped space K, and when the elastic piece 6 bends, the cylindrical roller 4 moves toward the wider side of the wedge-shaped space K along the cam surface 5b. (See FIG. 2) is allowed. Next, the operation of the one-way clutch A will be described. When the shaft 1 rotates with respect to the housing 2 in the narrower width of the wedge-shaped space K (P direction in FIG. 1), the cylindrical rollers 3 move into the narrower side of the wedge-shaped space K and the cam surface 5b and the shaft. It is pressed against the surface of 1. As a result, the shaft 1 and the housing 2 are integrally rotated via the cylindrical rollers 4, and power is transmitted. On the contrary, when the shaft 1 is rotated with respect to the housing 2 in the wider width direction of the wedge-shaped space K (direction Q in FIG. 1), the cylindrical roller 4 moves toward the wider width side of the wedge-shaped space K 1 and the cam surfaces 5b and Since the contact force on the surface of the shaft 1 is weakened, rotation of the shaft 1 with respect to the housing 2 is allowed.

According to this embodiment, the following operational effects are exhibited. That is, conventionally, the cam surface was directly formed inside the recess provided in the outer ring or the like, so that there was a problem that it was difficult to process, whereas in the present embodiment, if only key groove processing is performed. It is good and easy to process. If one set of the clutch unit U 1 having the cylindrical roller 4, the cam forming body 5 and the elastic piece 6 is prepared, the depth of the key groove portion 21 of the housing 2 (strictly speaking, in FIG. It is possible to adapt to a wide range of shaft diameter sizes by only setting the desired maximum distance t between the bottom surface of the shaft and the inner peripheral surface of the shaft insertion hole 21 of the housing 2 and the shaft diameter d. it can. Moreover, since only one set of clutch units U is arranged, the one-way clutch A can be downsized as a whole.

The present invention is not limited to the above-described embodiment, and for example, an elastic member such as a compression coil spring can be used instead of the elastic piece 6. Further, the housing may form an outer ring or a retainer, and various modifications can be made without departing from the scope of the invention.

[0014]

[Effect of the device]

 As described above, according to the one-way clutch of the present invention, it is not necessary to form a cam surface on the outer ring or the like, so that it is easy to process, and it has the cylindrical roller, the cam forming body, and the biasing means. If one set of clutch units is prepared, it is possible to adapt to a wide range of shaft diameter sizes by simply setting the depth of the recess of the housing to a desired value.

[Brief description of drawings]

FIG. 1 is a sectional view of a one-way clutch according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a partially cutaway perspective view of a holding member.

FIG. 4 is a perspective view of a cam forming body.

[Explanation of symbols]

 1 shaft 2 housing 21 key groove part U clutch unit 3 holding member 31 holding space 4 cylindrical roller 5 cam forming body 5b cam surface 6 elastic piece (biasing means) K wedge-shaped space

Claims (1)

[Scope of utility model registration request] 1. A one-way clutch which is arranged around a shaft and which transmits power by rotating integrally with the shaft through a cylindrical roller, has an insertion hole through which the shaft is inserted, and an inner periphery of the insertion hole. The housing includes a key groove portion, and a clutch unit fixed in the key groove portion. The clutch unit includes a holding member having a holding space for holding the cylindrical roller, and the clutch unit is housed in the holding space. A metal cam forming body having a cam surface that forms a wedge-shaped space for sandwiching the cylindrical roller with the peripheral surface, and a metal cam forming body that is provided in the holding space and that urges the cylindrical roller toward the narrow side of the wedge-shaped space. A one-way clutch comprising a biasing means.