JP3848024B2 - Resin cage for one-way clutch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin cage for a one-way clutch.
[0002]
[Prior art]
Conventionally, as an outer cage in a double one-way clutch in which both an outer cage and an inner cage are made of resin, as shown in FIG. 4, a plurality of protrusions 81, 81,. There is something with. The protrusion 81 is formed on the column 83 between the window 82 and presses the inner peripheral surface of the outer ring 80 at all times after assembly. Thereby, the outer cage serves to transmit the rotational force of the outer ring to a sprag (not shown) fitted to the window 82.
[0003]
[Problems to be solved by the invention]
However, since the outer cage made of the resin material is used in a state where it is press-fitted into the outer ring 80, it is exposed to a high temperature during use, and the protrusion 81 undergoes creep deformation, and the fixing torque of the outer cage with respect to the outer ring 80 is increased. There is a problem that decreases. This decrease in the fixed torque causes a problem that the one-way clutch rotates together with the inner ring when the inner ring is idling with respect to the outer ring, and causes a reduction in the engagement of the sprags when locked. .
[0004]
In order to solve this problem, if the initial fixed torque is increased by increasing the protrusion 81 or the like, the shortage of the fixed torque can be alleviated, but there is a problem that the one-way clutch can be easily assembled to the outer ring. If the number of protrusions 81 is reduced to reduce the initial fixing torque, the assemblability is improved, but the roundness is deteriorated.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a resin cage for a one-way clutch that can secure a fixed torque during use, can suppress deterioration in roundness, and has good assemblability.
[0006]
[Means for Solving the Problems]
To achieve the above object, the one-way clutch resin cage according to the first aspect of the present invention comprises a first protrusion that always contacts the outer ring and a second protrusion that contacts the outer ring only during thermal expansion. Yes.
[0007]
According to the first aspect of the present invention, the first protrusion comes into contact with the outer ring and the second protrusion does not come into contact with the outer ring at the time of assembling, so that the initial fixing torque can be suppressed and the assembling property can be improved. Further, during use, not only the first protrusion but also the second protrusion comes into contact with the outer ring due to thermal expansion, so that the fixing torque of the outer cage with respect to the outer ring can be secured, and a reliable clutch operation can be achieved.
[0008]
That is, according to the cage of the present invention, by providing both the first protrusion that is always in contact with the outer ring and the second protrusion that is in contact with the outer ring only at the time of thermal expansion, the initial fixing is performed without impairing the roundness during use. At the same time as suppressing the torque, a fixed torque at the time of use can be secured, a reliable clutch operation can be achieved, and assembly is facilitated.
[0009]
According to a second aspect of the present invention, in the one-way clutch resin cage according to the first aspect, the first protrusions and the second protrusions are alternately arranged in the circumferential direction. .
[0010]
In the invention of claim 2, since the first protrusions and the second protrusions are alternately arranged in the circumferential direction, the distribution of the fixed torque in the circumferential direction can be made uniform, and further assembling can be improved. The fixed torque can be improved during use.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
[0012]
FIG. 1 shows an embodiment of a resin cage for a one-way clutch according to the present invention. This resin cage is composed of an annular base 2 having a plurality of windows 1, 1, 1... Formed at predetermined intervals in the circumferential direction. The first protrusions 5 and the second protrusions 6 are alternately formed in the circumferential direction on the pillars 3, 3, 3... Between the window 1 and the window 1 of the annular base 2. As shown in FIG. 2, the first protrusion 5 and the second protrusion 6 protrude in a circular shape in the radial direction, and the first protrusion 5 has a larger radial protrusion than the second protrusion 6. As shown in FIG. 3A, when assembled, the first protrusion 5 is in pressure contact with the inner peripheral surface of the outer ring 7, but the second protrusion 6 is separated from the inner peripheral surface of the outer ring 7 and is not in contact therewith. On the other hand, when the temperature rises during use, the second protrusion 6 and the column 3 on which the second protrusion 6 is formed thermally expand as shown in FIG. Press contact with the peripheral surface. The first and second protrusions 5 and 6 serve to lock the one-way clutch to the outer ring 7 and prevent the one-way clutch from rotating with the inner ring when the inner ring (not shown) is idling.
[0013]
Here, in this embodiment, the inner diameter D1 of the outer ring 7 is 66.38 mm, the outer diameter D4 of the protrusion portion of the outer cage is 65.15 mm, and the inner diameter D5 of the annular base 2 is 61.75 mm. Further, the maximum outer diameter D2 at the first protrusion 5 of the outer cage was 66.43 mm (tightening margin 0.05 mm) at normal temperature and 66.61 mm (tightening margin 0.23 mm) at 120 ° C. Further, the maximum outer diameter D3 at the second protrusion 6 of the outer cage was 66.30 mm (no fastening allowance) at normal temperature, and 66.48 mm (tightening allowance 0.10 mm) at 120 ° C. The second protrusion 6 is in contact with the outer ring 7 at a temperature of 43 ° C. or higher.
[0014]
Thus, according to the resin outer cage of this embodiment, the first protrusion 5 is in contact with the outer ring 7 and the second protrusion 6 is not in contact with the outer ring 7 at the time of assembly. Assembling can be improved. Further, during use, not only the first protrusion 5 but also the second protrusion 6 comes into contact with the outer ring 7 due to thermal expansion, so that the fixing torque of the outer cage with respect to the outer ring 7 can be secured, and a reliable clutch operation can be achieved. .
[0015]
That is, according to the resin outer cage of this embodiment, by including both the first protrusion 5 that is always in pressure contact with the outer ring 7 and the second protrusion 6 that is in pressure contact with the outer ring 7 only during thermal expansion, The initial fixed torque is suppressed without impairing the roundness, and at the same time, the fixed torque at the time of use is ensured, and a reliable clutch operation can be achieved and the assembly is facilitated.
[0016]
Further, according to the resin outer cage of this embodiment, since the first protrusions 5 and the second protrusions 6 are alternately arranged in the circumferential direction, the distribution of the fixed torque in the circumferential direction can be made uniform. Thus, it is possible to further improve the assemblability and to improve the fixed torque during use.
[0017]
In addition, the interference with respect to the outer ring | wheel of the 1st, 2nd protrusions 5 and 6 of this embodiment is not restricted to the value mentioned above.
[0018]
【The invention's effect】
As is apparent from the above, the resin cage for a one-way clutch of the invention of claim 1 includes a first protrusion that is always in contact with the outer ring and a second protrusion that is in contact with the outer ring only during thermal expansion. According to the first aspect of the present invention, the first protrusion comes into contact with the outer ring and the second protrusion does not come into contact with the outer ring at the time of assembling, so that the initial fixing torque can be suppressed and the assembling property can be improved. Further, during use, not only the first protrusion but also the second protrusion comes into contact with the outer ring due to thermal expansion, so that the fixing torque of the outer cage with respect to the outer ring can be secured, and a reliable clutch operation can be achieved.
[0019]
According to a second aspect of the present invention, in the resin cage for a one-way clutch according to the first aspect, the first protrusions and the second protrusions are alternately arranged in the circumferential direction. The distribution in the circumferential direction can be made uniform to further improve the assemblability and the fixed torque during use.
[Brief description of the drawings]
FIG. 1 is a diagram showing an entire embodiment of a resin cage for a one-way clutch according to the present invention.
FIG. 2 is a partially enlarged view partially showing the embodiment.
FIG. 3 (A) is a partially enlarged view showing a state when the embodiment is assembled, and FIG. 3 (B) is a partially enlarged view showing a state when the embodiment is used.
FIG. 4 is a diagram showing an entire conventional resin cage for a one-way clutch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Window, 2 ... Ring base, 3 ... Column, 5 ... 1st protrusion, 6 ... 2nd protrusion, 7 ... Outer ring.

Claims (2)

A first protrusion always in contact with the outer ring;
A resin cage for a one-way clutch, comprising: a second protrusion that contacts the outer ring only during thermal expansion. The resin cage for a one-way clutch according to claim 1, wherein the first protrusions and the second protrusions are alternately arranged in the circumferential direction.

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