JP2003056605A - Ratchet one-way clutch and stator using ratchet one-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ratchet one-way clutch that suppresses vibration and impact noise by absorbing an impact caused when a pawl member fits in a recessed portion. SOLUTION: The ratchet one-way clutch, which comprises an inner ring 2 and an outer ring 3 in a coaxial arrangement, one of which has the pawl member 4 for transmitting torque and an urging member 5 for urging the pawl member and the other of which has the recessed portion 6 in which the pawl member fits, has impact absorbing members 20, 22 and 24 for absorbing or relieving an impact caused when the pawl member fits in the recessed portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in transmissions such as automobiles, agricultural machines, construction machines, and industrial machines, and particularly in automatic transmissions such as vehicles. The present invention relates to a ratchet one-way clutch using a ratchet as a mechanism and a stator for a torque converter using the ratchet one-way clutch.

[0002]

2. Description of the Related Art Generally, a one-way clutch used in an automatic transmission has an outer ring and an inner ring that rotate relative to each other, and sprags, rollers, and the like that transmit torque between the outer ring and the inner ring are provided on the raceway surface of the outer ring or the inner ring. By engaging with the cam surface provided, rotational torque is transmitted only in one direction. Further, it is configured to idle in the opposite direction.

Among such one-way clutches, there is a ratchet one-way clutch using a ratchet (claw member) as a torque transmission member for transmitting torque between the outer ring and the inner ring. The ratchet one-way clutch locks the one-way clutch by fitting the outer ring having a pocket on the inner periphery, the inner ring coaxial with the outer ring and having a notch on the outer periphery, and the notch (recess) of the inner ring housed in the pocket. It is composed of a claw member that transmits torque between the inner ring and the outer ring, and an elastic body that biases the claw member toward the inner ring.

In the ratchet one-way clutch having the above structure, when the one-way clutch rotates in one direction, the claw member slides freely on the outer circumference of the inner ring, so that the outer ring and the inner ring relatively idle. Next, when the one-way clutch tries to rotate in the other direction, the claw member fits into the notch, and the one-way clutch is locked up.

[0005] In recent years, the development of miniaturization, weight reduction and cost reduction of automobile parts such as an automatic transmission has been actively conducted, and the one-way clutch is no exception. The use of ratchet one-way clutches has been proposed to meet such demands.

A conventional ratchet one-way clutch using a clutch hub as an outer ring has an inner ring and an outer ring coaxially arranged, and a claw member is arranged on an inner peripheral portion of the outer ring to urge the garter spring. It is configured to be.

In the ratchet one-way clutch, when the inner ring and the outer ring rotate relative to each other in a predetermined direction, the claw member fits into a recess provided on the outer periphery of the inner ring to transmit torque, and rotate relative to the direction opposite to the predetermined direction. If it spins. Details of a typical ratchet one-way clutch are described in, for example, US Pat. No. 5,853,073.

[0008]

In the conventional ratchet one-way clutch having the above-described structure, due to the structure, when the claw member is fitted in the recess, an impact sound such as a hammering sound is generated due to an impact generated by the engagement. Occurrence was unavoidable. Further, similarly, vibration due to impact is transmitted from the inner ring side to the drive shaft side. For example, when used in a vehicle, the impact sound and vibration may cause an occupant to feel uncomfortable, and the vibration may adversely affect the operation of the one-way clutch itself. Therefore, an object of the present invention is to provide a ratchet one-way clutch that absorbs the shock generated when the claw member is fitted in the recess and suppresses vibration and shock noise.

[0009]

To achieve the above object, a ratchet one-way clutch of the present invention comprises an inner ring and an outer ring coaxially arranged, and a claw member for transmitting torque to one of the inner ring and the outer ring. And a ratchet one-way clutch in which an urging member for urging the claw member is arranged, and a concave portion into which the claw member is fitted is provided on the other side, in order to absorb or cushion an impact generated when the claw member is fitted into the concave portion The impact absorbing member is provided.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a shock absorbing member is provided for absorbing or absorbing a shock generated when the claw member is fitted in the recess. The shock absorbing member is an elastic member and is arranged as follows.

A shock absorbing member is provided in the recess. The shock absorbing member is provided between the inner ring and the drive shaft. Further, the inner ring and the drive shaft are fitted by a spline, and the shock absorbing member is provided on the spline.

[0012]

The present invention will be described in detail below with reference to the accompanying drawings. In the drawings, the same parts are designated by the same reference numerals. Further, it goes without saying that each embodiment is described as an example of the present invention and does not limit the present invention.

FIG. 1 is a front view of a stator for a torque converter using a ratchet one-way clutch of the present invention, and FIG. 2 is a sectional view taken along the line ZOZ of FIG. The stator 1 is an outer ring 3 arranged on the inner circumference of the impeller 7.
And an inner ring 2 arranged coaxially with the outer ring 3. A first pocket 15 and a second pocket 16 are provided on the inner circumference of the outer ring 3.
The ratchet, that is, the claw member 4 is disposed in the first pocket 15, and the biasing spring 5 that biases the claw member 4 in the oblique inner diameter direction is disposed in the second pocket 16.
On the other hand, a concave portion 6 into which the claw member 4 fits is formed on the outer periphery of the inner ring 2.

The inner peripheral side portion 14 of the impeller 7 is in contact with the outer peripheral surface and the side surface of the outer ring 3 and has a function of a bush, and functions as a bearing, and the claw member 4 and the biasing spring 5 are axially arranged. I support you. A spring 8 is interposed between the inner peripheral portion 14 and the outer ring 3. A convex portion 9 is formed on the inner peripheral portion 14 and a concave portion 10 is formed on the outer peripheral portion of the outer ring 3. The concave portion 10 covers the convex portion 9 via a gap 11, and the spring 8 connects the convex portion 9 to one side of the concave portion 10. It is designed to be pressed. By adopting this configuration, the claw member 4 can move the inner ring 2
The spring 8 absorbs an impact when it is fitted in the concave portion 6 on the outer periphery, and the convex portion 9 and the concave portion 10 are fitted within the contraction range of the spring 8 to limit the relative rotation between the respective members. The spring 8 is designed to prevent the settling and damage of the spring 8.

A recess serving as the stress dispersion means 12 is provided on the inner circumference of the outer ring 3 of the stator 1. This stress dispersion means 12
Has a substantially semicircular cross section in the radial direction and is formed by a curved surface. The spring 8 is attached to the ratchet one-way clutch through the assembling window 17 using a jig (not shown). In addition, a spline 18 for connecting with a drive shaft described later is provided on the inner circumference of the inner ring 2.

(First Embodiment) FIGS. 3 to 5 show the details of the first embodiment of the present invention. 3 is a front view of the elastic member used in the first embodiment, FIG. 4 is a cross-sectional view of the elastic member of FIG. 3, and FIG. 5 is a perspective view of the elastic member of FIG. It is an axial sectional view showing a state.

As can be seen from FIGS. 3 and 4, the shock absorbing member, that is, the elastic member 20, is a member having a substantially circular cross section and a substantially annular shape as a whole. It is made of a material such as rubber having a predetermined elasticity. FIG. 5 illustrates a mounting state of the elastic member 21.

As shown in FIG. 5, the drive shaft 21 is fitted to the inner ring 2 by a spline 18. Elastic member 20
Is fitted into an annular groove 26 provided on the outer peripheral surface of the drive shaft 21 to fix the axial position, and is located at one axial end of the inner ring 2. That is, it is fitted between the spline 18 of the inner ring 2 and the outer peripheral surface of the drive shaft 21. With this configuration,
The impact generated when the claw member 4 is fitted into the recess 6 is absorbed or buffered by the elastic member 20 and can be prevented from being transmitted to the drive shaft 21.

In FIG. 5, the elastic member 20 is provided only at one end of the inner ring 2 in the axial direction, but it may be provided at both ends. By doing so, the shock absorbing function is further improved.

(Second Embodiment) FIG. 6 is a partial front view of the ratchet one-way clutch of the second embodiment.
FIG. 7 is a partial top view of the ratchet one-way clutch of the second embodiment. In the second embodiment, the elastic member 22 is not an annular member but a columnar member having a substantially circular cross section as shown in FIG. The elastic member is made of rubber or the like as in the first embodiment, but may be made of a relatively soft synthetic resin or the like.

The shock absorbing member, that is, the elastic member 22, is
It is accommodated in a pocket 23 provided in the recess 6 and having a size that allows the elastic member 22 to be fitted therein. As shown in FIGS. 6 and 7, one elastic member 22 is arranged in each recess 6. That is, although the number of the recesses 6 is the same as the number of the elastic members 22, the number of the elastic members 22 can be reduced if necessary. That is, instead of arranging the elastic members 22 in all the concave portions 6, it is possible to arrange the elastic members 22 at predetermined intervals.

As can be seen from FIG. 7, the axial length of the elastic member 22 is about 1/3 of the axial length of the recess 6, that is, the inner ring 2, but is the same as the entire axial width of the inner ring 2. It can also be done. With such a configuration, when the claw member 4 is fitted into the recess 6, the tip of the claw member 4 is brought into contact with the elastic member 22 to absorb or cushion the shock.

(Third Embodiment) FIG. 8 is a partial front view of a ratchet one-way clutch according to a third embodiment.
1 is a partial front view of a ratchet one-way clutch of the third embodiment, showing a state in which a shock is absorbed.
0 is a partial top view of the ratchet one-way clutch of the third embodiment.

The shock absorbing member, that is, the elastic member 24, is
The drive shaft 21 is housed in a pocket 25 formed in a mountain portion of the spline 19. As shown in Figure 8-10,
One elastic member 24 is arranged on each crest of the spline 19. That is, the number of peaks of the spline 19 and the elastic member 24
However, the number of elastic members 24 can be reduced if necessary. That is, instead of arranging the elastic members 24 on all the peaks, they can be arranged at predetermined intervals.

The axial length of the elastic member 24 is as shown in FIG.
As can be seen from 0, it is about 1/2 of the axial length of the crest of the spline 19, but it can also be the same as the entire width of the crest in the axial direction. Further, the elastic member 24 may be provided on the spline 18 side of the inner ring 2. Also, the elastic member 2
4 is a columnar member having a substantially circular cross section, as in the second embodiment. The elastic member 24 is made of rubber or the like as in the first and second embodiments, but may be made of a relatively soft synthetic resin or the like.

FIG. 8 shows a state in which the claw member 4 is not yet completely fitted in the recess 6 of the inner ring 2. At this time, the spline 18 of the inner ring 2 and the spline 19 of the drive shaft 21 are in contact with each other on the left side surface in the figure, and the elastic member 24 arranged on the opposite side thereof is not yet crushed. From this state, the state shown in FIG. 9, that is, the claw member 4 is recessed 6
When they are completely fitted to each other, the impact causes the splines 18 and 19 to move relative to each other and contact each other on the right side surface in the figure. At this time, the elastic member 24 is crushed and absorbs the shock.

In each of the embodiments of the present invention described above, if the concave portion is provided on the inner ring 2 side and the claw member is provided on the outer ring 3 side, it is of course possible to reverse the configuration. That is, the inner ring 2 is provided with a claw member and a pocket for housing the claw member,
The outer ring 3 may be provided with a recess. In that case, it goes without saying that the elastic member provided in the recess on the inner ring side in the second embodiment is arranged in the recess on the outer ring side. Further, in the third embodiment, it is possible to provide a pocket in the spline 18 on the inner ring side and dispose the elastic member 24 therein.

[0028]

The ratchet one-way clutch of the present invention and the stator using the same described above have the following effects. According to the configuration of the present invention, in the ratchet one-way clutch, it is possible to absorb the shock generated when the claw member is fitted in the recess, and suppress the vibration and shock noise.

[Brief description of drawings]

FIG. 1 is a front view of a stator using a ratchet one-way clutch of the present invention.

FIG. 2 is a cross-sectional view taken along the line ZOZ of FIG.

FIG. 3 is a front view of an elastic member used in the first embodiment.

4 is a cross-sectional view of the elastic member of FIG.

5 is an axial sectional view showing a state where the elastic member of FIG. 3 is fitted to a drive shaft.

FIG. 6 is a partial front view of the ratchet one-way clutch of the second embodiment.

FIG. 7 is a partial top view of the ratchet one-way clutch of the second embodiment.

FIG. 8 is a partial front view of the ratchet one-way clutch of the third embodiment.

FIG. 9 is a partial front view of the ratchet one-way clutch of the third embodiment, showing a state in which a shock is absorbed.

FIG. 10 is a partial top view of the ratchet one-way clutch of the third embodiment.

[Explanation of symbols]

1 stator 2 inner ring 3 outer ring 4 claw members 5 biasing spring 6 recess 15 First Pocket 16 Second pocket 18,19 splines 20, 22, 24 Elastic member

Claims (5)

[Claims] 1. An inner ring and an outer ring that are coaxially arranged, and a claw member that transmits torque and a biasing member that biases the claw member are arranged on one of the inner ring and the outer ring,
On the other hand, in a ratchet one-way clutch provided with a recess into which the claw member fits, a shock absorbing member for absorbing or cushioning a shock generated when the claw member fits into the recess is provided. The characteristic ratchet one-way clutch. 2. The ratchet one-way clutch according to claim 1, wherein the shock absorbing member is provided in the recess. 3. The ratchet one-way clutch according to claim 1, wherein the shock absorbing member is provided between the inner ring and the drive shaft. 4. The ratchet one-way clutch according to claim 3, wherein the inner ring and the drive shaft are fitted to each other via a spline, and the shock absorbing member is provided on the spline. 5. A stator using the ratchet one-way clutch according to any one of claims 1 to 4.