JPH11218160A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide structure efficiently assembled while preventing the slip-off of a roller in a process of assembling the roller to a retainer in a one-way clutch. SOLUTION: In a one-way clutch A switching into a lock state of synchronously rotating two inner and outer annular bodies disposed in a concentric state, and a free state of relatively rotating the annular bodies, circumferentially opposed internal wall surfaces 6a, 6b in each roller storage pocket 6 of a retainer 2 are formed into flat faces parallel to each other along the radial direction of the retainer 2, and a protuberant part 13 impeding the slip-off of the roller 1 is provided on the inner diameter side in one internal wall surface 6a facing the roller 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a one-way clutch. In particular, the one-way clutch retainer has been improved.

[0002]

2. Description of the Related Art As an example of such a conventional one-way clutch, the present applicant has proposed a structure as shown in FIGS.

The one-way clutch B includes a plurality of rollers 31
And a cage 32 having a rectangular hole-shaped pocket 36 in which rollers 31 are stored one by one in several places around the circumference, an outer ring 33 provided on the outer periphery of the cage 32, and a pocket 3 of the cage 32.
Cam surface 37 forming a wedge-shaped space at a position corresponding to 6
Are provided, and a coil spring 35 that elastically urges the rollers 31 toward the narrow side of the wedge-shaped space. The above-described coil spring 35 is provided in the pocket 3 of the retainer 32.
6 is fitted and held on a spring receiving projection 38 provided on the inner wall surface.

[0004]

In assembling the above-described conventional one-way clutch B, first, FIG.
As shown in the figure, the rollers 31 elastically urged by the coil spring 35 are stored in the respective pockets 36 of the retainer 32,
6, the roller 31 is received and temporarily fixedly held on one inner wall surface 36a, and when the assembly of the roller 31 and the coil spring 35 into all the pockets 36 is completed, the outer ring 33 and the inner ring 34 are mounted to complete the one-way clutch B. You do it.

In this case, the inner wall surfaces 36a and 36b of the pocket 36 which face each other in the circumferential direction are formed on parallel flat surfaces along the radial direction of the retainer so that a punching die for forming a pocket can easily be pulled out. Therefore, in the roller assembling step to the cage 32, the rollers 31 temporarily supported by the flat inner wall surface 36a may easily fall off to the center of the cage due to vibration or impact. Is required, which is one of the causes of deterioration of workability.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a one-way clutch having a structure which can prevent the rollers from falling off in a step of assembling the rollers to the cage and can be assembled efficiently.

[0007]

According to the present invention, there is provided a one-way clutch according to the present invention, wherein a cage having a plurality of pockets in which rollers are accommodated so as to be able to roll in a circumferential direction is accommodated in each pocket in a compressed state. And a coil spring that resiliently biases the rollers toward the lock side by the extension restoring force, and the inner wall surfaces facing in the circumferential direction in the pocket are formed on uneven planes parallel to each other along the radial direction, On both inner wall surfaces, a raised portion is provided on the inner diameter side of the inner wall surface facing the roller to prevent the roller from slipping out to the inner diameter side.

According to the above construction, in the roller assembling step to the cage, even if the roller temporarily supported and supported on one of the inner wall surfaces of the pocket falls down toward the center of the cage due to vibration or impact, the raised portion is formed. Therefore, it is prevented from getting out of the retainer by being received.

According to a second aspect of the present invention, in the one-way clutch according to the first aspect, the retainer is a resin molded product,
The pocket is formed by a punching die.

According to this structure, the abutment portion can be easily formed in the same molding process as the conventional one simply by forming a cut in the conventional die for forming a pocket used when molding the cage with the resin. can do.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS.

FIGS. 1 to 6 relate to an embodiment of the present invention. FIG. 1 is a longitudinal sectional front view of a one-way clutch, and FIG.
FIG. 3 is a developed plan view showing the cage and the rollers housed therein, FIG.
Is a front view of the one-way clutch, FIG. 4 is an exploded perspective view showing the cage and the rollers housed therein, FIG. 5 is a longitudinal sectional front view showing a state where the rollers are temporarily fixed to the cage, and FIG. FIG. 4 is a cross-sectional view showing a main part of a mold for resin-molding the cage.

The one-way clutch A according to this embodiment has the same basic structure as that described in the conventional example, and includes a plurality of rollers 1 and a rectangular shape in which one roller 1 is housed at several locations around the circumference. A cage 2 having a hole-shaped pocket 6, an outer ring 3 disposed on the outer periphery of the cage 2, and a cam surface 7 forming a wedge-shaped space at a position corresponding to the pocket 6 of the cage 2 are provided. The inner ring 4 and a coil spring 5 housed in a compressed state in each pocket 6 and resiliently bias the roller 1 toward the narrow side (lock side) of the wedge-shaped space with an expansion restoring force are provided. The cam surface 7 is a flat key-shaped notch, and the wedge space is formed by the cam surface 7 and the inner peripheral surface of the outer ring 3.

The roller 1 is accommodated in the pocket 6 of the retainer 2 so as to be rollable in the circumferential direction and is biased to one side in the circumferential direction. Further, the coil spring 5 is provided with a pocket 6 of the cage 2.
The roller 1 is arranged so as to be biased toward the other side in the circumferential direction, and the direction of expansion and contraction is orthogonal to the central axis of the roller 1, and one end thereof is in contact with the axially intermediate portion of the roller 1. As the coil spring 5, a square coil spring in which a spring wire is wound so as to have a horizontally long rectangular cross section is used, and is disposed substantially parallel to the cam surface 7 of the inner race 4.

A single spring receiving projection 8 projecting into the pocket 6 is integrally formed on the inner wall surface on the side where the coil spring 5 is disposed in the pocket 6 of the cage 2, and the coil spring 5 is attached to the spring receiving projection 8. Fitted and mounted. One end of the coil spring 5 is locked and fitted into a circumferential groove 9 formed at the base of the projection 8, and the inner periphery of the coil spring 5 is received at the outer periphery of the projection 8, so that the direction of expansion and contraction of the coil spring 5 and the left-right direction In addition to preventing bending deformation, the coil spring 5 is positioned and held at a fixed position. Each projection 8 is tapered so that the coil spring 5 can be easily mounted.

The retainer 2 is fixed to the inner race 4. That is, at the diagonal position of one end surface in the circumferential direction of the inner ring 4, a slit-shaped concave portion 11 which is opened toward the shaft end and opened inward and outward in the radial direction is provided. On the inner peripheral side, a pair of convex portions 12 which are press-fitted into the concave portion 11 from the axial direction are provided. Movement in the direction is sealed.

At the time of assembling the one-way clutch A having the above structure, first, as shown in FIG. 5, the roller 1 elastically urged by the coil spring 5 is stored in each pocket 6 of the retainer 2,
The roller 1 is received on one inner wall surface 6a of the pocket 6, and temporarily held. Roller 1 for all pockets 6
When the assembly of the coil spring 5 is completed, the one-way clutch A is completed by mounting the outer race 3 and the inner race 4.

In this case, in the step of assembling the roller to the cage 2, the roller 1 temporarily supported on one inner wall surface 6a of the pocket 6 may come off to the inner diameter side due to vibration or impact. In this embodiment, a raised portion 13 is provided on the inner diameter side of the one inner wall surface 6a, and even if the roller 1 comes off toward the center of the cage, the raised portion 13 is removed.
And is prevented from falling out of the cage 2. It is sufficient that the raised portion 13 has a width enough to stably receive and hold the roller 1. In this example, the raised portion 13 is formed wide in the axial direction over a range slightly shorter than the length of the roller 1. The outer diameter side surface of the raised portion 13
The roller 1 is preferably formed on a concave curved surface having a curvature equal to or slightly larger than the radius of the roller 1 in order to stably receive the roller 1, but may be formed on a linearly inclined surface.

The roller 1 temporarily supported by the retainer 2 as described above floats from the inner wall surface 6a of the pocket when the outer ring 3 and the inner ring 4 are mounted.
The operation of the roller 1 is not involved at all.

As shown in FIG. 6, the retainer 2 is formed by resin molding using inner and outer dies 14, 15 and a punch forming die 16 for forming pockets.
By forming the recessed portion 17 in a part of 6, a molding cavity of the raised portion 13 can be formed.

Next, the operation of the one-way clutch A will be described. When the rotation speed of the outer ring 3 is relatively higher than the inner ring 4 in the clockwise direction in the drawing, the rollers 1 are rolled to the narrow side of the wedge space and locked, so that the outer ring 3 and the inner ring 4 are integrated. To rotate synchronously to perform power transmission.
However, when the rotation speed of the outer ring 3 becomes relatively slower than that of the inner ring 4, the rollers 1 are rolled to the wide side of the wedge space and become free, so that power transmission between the outer ring 3 and the inner ring 4 is performed. Is shut off.

The one-way clutch A of this embodiment
In this configuration, the angularly wound coil spring 5 is caused to abut on a wide area in the axial middle of the roller 1 so that the resilient urging force of the coil spring 5 assists the roller 1 in rotating. The skew can be provided in a well-balanced state while the skew is sufficiently suppressed. Further, since such a coil spring 5 is externally fitted and supported by the spring receiving projection 8 of the retainer 2, the coil spring 5 does not bend unduly up, down, left and right, and even if it receives vibration or impact, Does not shift. As a result, the resilient urging force of the coil spring 5 can always be appropriately applied to the roller 1, and it is possible to contribute to stabilizing the locking operation and the free operation by the roller 1.

The present invention is not limited to the above-described embodiment, and various applications and modifications are conceivable.

(1) In the above embodiment, the cage 2
For example, as shown in FIG.
The same function is exerted even if it is provided in several places in the axial direction of a.

(2) In the above embodiment, the raised portion 13 of the retainer 2 is raised to the inner peripheral end of the inner wall surface 6a in order to facilitate the removal of the punching die 16. When the height is set to be extremely small, it is also possible to form the raised portion 13 locally by protruding, and forcibly remove the punching die 16.

(3) The cam surface 7 is formed flat, but may be curved.

(4) The cam surface 7 may be formed on the outer ring 3 side.

(5) The one-way clutch A of the present invention can be built in pulleys of various accessories mounted on an engine of a car or the like. As an example, an example in which the accessories are an alternator is provided. As shown in FIG. 8, in this case,
The one-way clutch A of the above-described embodiment is interposed between the pulley 20 of the alternator and the rotor 21, and rolling bearings 22 are provided on both sides in the axial direction. in this case,
The one-way clutch A switches between the free state and the locked state according to the rotation difference between the pulley 20 and the rotor 21, and transmits or cuts off the rotational power from the pulley 20 to the rotor 21. In the alternator, since the pulley 20 is rotationally driven by the crankshaft of the engine via the belt 23, when the pulley 20 and the rotor 21 are integrated without interposing the one-way clutch A,
As the rotation speed of the crankshaft decreases, the rotation speed of the rotor 21 also decreases and the power generation efficiency of the alternator decreases, but by interposing the one-way clutch A,
Even if the rotation speed of the pulley 20 decreases due to the reduction in the rotation speed of the crankshaft, the one-way clutch A can function so that the rotor 21 itself maintains a high rotation speed by its own inertial force. It is effective for improvement of.

[0029]

According to the first aspect of the present invention, in the roller assembling step to the cage, the rollers temporarily supported on one inner wall surface of the pocket fall down to the center of the cage due to vibration or impact. Even if it is applied, the bulge provided on one inner wall surface will catch it and prevent it from coming out to the inner diameter side, so the operator does not need to be careful to prevent the rollers from falling off, The workability of assembling the clutch can be improved.

According to the second aspect of the present invention, the raised portion for preventing the roller from falling off can be easily formed integrally with the inner wall surface of the pocket by using the punching die for forming the pocket. And the practical advantage is great.

[Brief description of the drawings]

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

FIG. 2 is an exploded plan view showing the cage and the rollers housed therein in the embodiment.

FIG. 3 is a front view of the one-way clutch of the embodiment.

FIG. 4 is an exploded perspective view showing the retainer and the rollers housed therein in the embodiment.

FIG. 5 is a longitudinal sectional front view showing a state in which rollers are temporarily fixed to a retainer in the embodiment.

FIG. 6 is a sectional view showing a main part of a mold for resin-molding the cage in the embodiment.

FIG. 7 is a developed plan view corresponding to FIG. 2, according to another embodiment of the present invention.

FIG. 8 is a sectional view showing the upper half of a pulley unit incorporating the one-way clutch of the present invention.

FIG. 9 is a longitudinal sectional front view showing an example of a conventional one-way clutch.

FIG. 10 is an exploded plan view of a conventional cage and rollers accommodated therein.

FIG. 11 is an exploded perspective view of a conventional cage and rollers accommodated therein.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller 2 Cage 5 Coil spring 6 Pocket 6a Inner wall surface 13 Raised part

Claims (2)

[Claims] 1. A one-way clutch that switches between a locked state in which two inner and outer rings arranged concentrically are synchronously rotated and a free state in which the two rings are rotated relative to each other. A retainer having a pocket that can be accommodated therein; and a coil spring that is accommodated in each pocket in a compressed state and that resiliently biases the rollers toward the lock side by an extension restoring force. While the wall surface is formed in the uneven plane parallel to each other along the radial direction,
A one-way clutch, wherein a raised portion is provided on an inner diameter side of the inner wall surface facing the roller, on both inner wall surfaces, to prevent the roller from coming off to the inner diameter side. 2. The one-way clutch according to claim 1, wherein said retainer is a resin molded product, and said pocket is formed by a punching die.