JPH109292A - One-way clutch - Google Patents

Abstract

(57) [Problem] To provide a one-way clutch which ensures good discharge of dust and good lubrication in a space without lowering the strength of the outer race or increasing the cost. A plurality of sprags are held and arranged in a cylindrical retainer between an inner race on an inner peripheral side and an outer race on an outer peripheral side rotatable around a common rotation shaft. A flange that protrudes outward in the radial direction is provided at both ends in the axial direction of the cylindrical portion, and a friction plate is provided outside the one flange in the axial direction. By operating the sprags, only one-way torque is transmitted. In the one-way clutch configured as follows,
A notch is provided on the outer periphery of the flange of the retainer so that a space surrounded by the outer race, the retainer, and the sprag communicates with the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch in which a plurality of sprags are interposed between an outer race and an inner race, and only one-way torque is transmitted by the operation of the sprags.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional one-way clutch. That is, as shown in FIG. 6, the one-way clutch 80 is rotatably mounted on the rotating shaft 70, which is one end of the crankshaft, via the needle bearing 71. The one-way clutch 80 includes an inner race 2, an outer race 83, a sprag 4, a retainer 85, a friction plate 86, and the like. A starter gear 72 is press-fitted into the inner race 2 so as to be integral therewith, and a rotating body of an ACG (AC generator) that rotates integrally with the rotating shaft 70 by a bolt 73a is fitted to the outer race 83. 73 are connected.

[0003] As shown in FIG. 7, a space between the inner race 2 on the inner peripheral side and the outer race 83 on the outer peripheral side is provided.
Pieces of sprags 4 are arranged, and a cylindrical retainer 8 is provided.
5 is held at a predetermined position. That is, the sprags 4 are arranged and held at a predetermined pitch by being accommodated in 30 holding holes 53 provided in the cylindrical portion of the retainer 85 at a constant pitch in the circumferential direction.

As shown in FIG. 7, the retainer 85 has flanges 85a, 85a (circular when viewed in the axial direction) projecting radially outward from both ends of the cylindrical portion in the axial direction.
b is provided. And one of the flanges 85
7A (the left side in FIG. 7), the outer peripheral portion extends into the annular concave portion 31 provided over the entire peripheral surface on the inner peripheral surface of the outer race 83. In addition, the flange 85a
A friction plate 86 is disposed on the outer surface side of the first member, and the friction plate 86 is welded to the flange 85a by spot welding to integrate the two.

The above-mentioned flange 85a of the retainer 85
The outer peripheral portion of the friction plate 86 is sandwiched by the ACG rotor 73 and the outer race 83 in the annular concave portion 31 of the outer race 83, so that the axial movement of the retainer 85 in the outer race 83 is restricted. . The other flange 85b (right side in FIG. 7) has its outer peripheral end in contact with the inner peripheral surface of the outer race 83, whereby the movement of the retainer 85 in the radial direction is restricted.

As shown in FIG. 7, the outer race 83 is provided with flow holes 9 having a diameter of 2 mm and radially opened at six locations on the circumference at equal intervals. The flow holes 9 are provided for discharging dust when the dust is accumulated in a space 75 surrounded by the outer race 83, the retainer 85 and the sprags 4 and improving the fluidity of the lubricating oil in the space 75. Have been.

[0007]

However, when the outer race 85 is provided with the flow holes 9, not only the strength of the outer race 85 is reduced but also the processing cost is increased. However, if the flow hole 9 is simply abolished, there is a possibility that dust may accumulate in the space 75, and the space 75
The lubrication inside may be deteriorated. Accordingly, an object of the present invention is to provide a one-way clutch that ensures good discharge of dust in a space and good lubrication without causing a decrease in the strength of the outer race and an increase in cost.

[0008]

According to the present invention, a plurality of sprags are provided in a cylindrical retainer between an inner race on an inner peripheral side and an outer race on an outer peripheral side rotatable about a common rotation axis. The retainer is arranged in a row, flanges are provided at both ends in the axial direction of the cylindrical portion of the retainer so as to protrude outward in the radial direction, and a friction plate is provided on the outer side in the axial direction of one of the flanges. In a one-way clutch configured to transmit only one-way torque, a notch is provided on an outer peripheral portion of a flange of the retainer so that a space surrounded by an outer race, a retainer, and a sprag communicates with the outside. By providing a one-way clutch characterized by that
The above object has been achieved.

[0009]

According to the one-way clutch of the present invention, dust generated in the space surrounded by the outer race, the retainer, and the sprags or invading into this space is reduced by the notch provided on the outer peripheral portion of the flange of the retainer. Easily flows out from the outside. Further, as for the lubricating oil in the space, since the flow path is secured by the notch, the contaminated lubricating oil in the space is easily discharged to the outside, and the clean lubricating oil is easily discharged to the outside. Supplied in space.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the one-way clutch of the present invention will be described below with reference to the drawings. 1 to 5 show one embodiment of the one-way clutch of the present invention. FIG. 1 is a longitudinal sectional view showing the entire one-way clutch. FIG. 2 is an enlarged view of the one-way clutch shown in FIG. FIG. 3A is a longitudinal sectional view showing FIG.
2 is a left side view of the retainer viewed from the direction A in FIG. 2, (b) is a right side view of the retainer also viewed from the direction B, and FIG. 4 shows a main part of the friction plate in the embodiment shown in FIG. 5A is a left side view of the outer race in the embodiment shown in FIG. 2 as viewed from the direction A in FIG. 2, and FIG. 5B is a partial plan view as viewed from the direction C in FIG. .

As shown in FIG. 1, the one-way clutch of this embodiment is rotatably mounted on a rotary shaft 70, which is one end of a crankshaft, via a needle bearing 71.
The one-way clutch 1 includes an inner race 2, an outer race 3, a sprag 4, a retainer 5, a friction plate 6, and the like. A starter gear 72 is welded to the inner race 2 so as to be integral therewith, and a rotating body of an ACG (AC generator) that rotates integrally with the rotating shaft 70 by a bolt 73a is fitted to the outer race 3. 73 are connected.

As shown in FIG. 2, thirty sprags 4 are disposed between the inner race 2 on the inner peripheral side and the outer race 3 on the outer peripheral side, and are positioned at predetermined positions by a cylindrical retainer 5. Is held. That is, the sprags 4 are arranged and held at a predetermined pitch by being accommodated in 30 holding holes 53 provided in the cylindrical portion of the retainer 5 at a constant pitch in the circumferential direction.

Each sprag 4 is provided with a groove 41 formed in the inner peripheral portion in the circumferential direction, and a return spring 74 having an annular coil spring penetrates through the groove 41 of each sprag 4. All the sprags 4 are each pressed radially outward by the return spring 74.

In the one-way clutch of this embodiment, when the engine is started, when the starter motor is started, the starter gear 72 is rotated, whereby the inner race 2 starts rotating (for example, clockwise). ,
As a result, the sprags 4 rotate slightly to change the angle, the outer races 3 and the inner races 2 engage via the sprags 4, torque is transmitted, and the outer races 3 are integrated with the inner races 2 (clockwise). )Rotate. as a result,
The rotating body 73 and the rotating shaft 70 of the ACG rotate, and the engine is started.

When the starter motor is stopped after the engine is started, the rotation of the inner race 2 (starter gear 72) starts to be slower than the rotation of the outer race 3 and the sprags 4 (the rotator 73 and the rotating shaft 70). 4 rotates slightly in the opposite direction to the above and returns to the original posture,
The engagement between the outer race 3 and the inner race 2 is released, the torque (clockwise) from the inner race 2 is not transmitted to the outer race 3, and the outer race 3 and the sprags 4 are slower than the inner race 2 that has stopped or stopped. Spin (clockwise).

On the other hand, the retainer 5 is manufactured by punching and drawing a steel plate material by a press machine, and as shown in FIG. , 52 are provided. Then, one of the flanges 51 (the left side in FIG. 2) has its outer peripheral portion extending into the annular concave portion 31 provided over the entire inner peripheral portion of the side surface of the outer race 3 (FIG. 3 (a)). )reference).

A friction plate 6 made of a stainless steel plate is disposed on the outer surface of the flange 51.
The friction plate 6 is welded to the flange 51 by spot welding S (see FIG. 4), and the two are integrated. The other flange 52 (right side in FIG. 2) has its outer peripheral end in contact with the inner peripheral surface of the outer race 3, whereby the movement of the retainer 5 in the radial direction is restricted. .

As shown in FIG. 2, the friction plate 6 has an inner peripheral portion depressed rightward, and a projection 61 is provided at a portion facing the sprag 4 (see FIG. 4). Then, the projecting pieces 61 enter into the circumferential ridges 42 formed on the left side surface of each sprag 4 respectively. The inner peripheral portion of the friction plate 6 is in contact with the inner peripheral portion of the sprag 4 on the left side.

The outer race 3 is connected to the outer periphery of the flange 51 of the retainer 5 and the outer periphery of the friction plate 6.
Of the ACG is held between the outer race 3 and the rotating body 73 of the ACG so that the axial movement of the retainer 5 in the outer race 3 is restricted. The other flange 52 (right side in FIG. 2)
The outer peripheral end of the retainer 5 is made to contact the inner peripheral surface of the outer race 3 to restrict the movement of the retainer 5 in the radial direction. These points are the same as those of a conventional one-way clutch of this type. Have been.

In the one-way clutch 1 of this embodiment, as shown in FIGS. 2 and 3, the outer race 3 and the retainer 5 are attached to the outer peripheral portions of the flanges 51 and 52 at both ends in the axial direction of the retainer 5, respectively. Notches 51a and 52 so that a space 75 surrounded by
a is provided.

The one-way clutch 1 of this embodiment will be further described. As shown in FIG. 3 (a), the one flange 51 of the retainer 5 partially cuts the notch 51a in the circumferential direction. It is provided at six places so as to be symmetrical with respect to the rotation shaft 70. As shown in FIG. 3B, the other flange 52 of the retainer 5 has the notch 52a partially formed in the circumferential direction similarly to the one flange 51 and symmetrical with respect to the rotation shaft 70. Are provided at six locations (but in a shape different from one of the flanges 51).

Further, as shown in FIG. 4, the outer peripheral shape of the friction plate 6 is formed substantially along the outer periphery of the one flange 51. Further, the six outer peripheral ends F of the friction plate 6 are slightly outward (FIG. 4).
At the front of the paper).
The flange 51 of the retainer 5 and the friction plate 6 are more strongly frictioned with the rotor 73 and the outer race 3 in the annular recess 31 of the outer race 3 by the spring action of the outer peripheral end portion F abutting against the side surface of the rotor 73. Under the force, the retainer 5 in the outer race 3 is restricted in axial movement and circumferential movement.

As shown in FIG. 5, the outer race 3 is provided with six radial grooves 32 having a semi-elliptical cross section on a surface of the outer race 3 which abuts against the rotating body 73 of the ACG. The radial grooves 32 are also provided on the surfaces.
An axial groove 33 having a semi-elliptical cross section is formed in the axial direction so as to be continuous.

In the one-way clutch 1 of the present embodiment constructed as described above, since the outer race 3 does not have the flow holes 9 provided in the conventional outer race 83, the strength of the outer race 3 is reduced. Better than
Further, the cost is reduced by omitting the processing of the flow holes 9.

In the one-way clutch 1 of the present embodiment, the space 75 surrounded by the outer race 3, the retainer 5, and the sprags 4 is provided to the outside by a notch 51a provided in one flange 51 of the retainer 5. Due to the communication, dust generated in the space 75 or invading the space 75 does not pass through the notch 51a as shown in FIG.
And flows in the circumferential direction in the annular concave portion 31 of the outer race 3, and is easily discharged outside from the radial groove 32 through the axial groove 33. The space 75 is
As shown in FIG. 3B, the other flange 5 of the retainer 5
2, the dust in the space 75 is directly discharged to the outside also from the notch 52a.

Further, since the flow path of the lubricating oil in the space 75 is secured by the notches 51a and 52a, the contaminated lubricating oil in the space 75 is easily discharged to the outside, and the clean oil is cleaned. Lubricating oil retainer 5 and sprag 4
Is easily supplied into the space 75 through a gap or the like.

Therefore, in the one-way clutch 1 of the present embodiment, the outer race 8 in the conventional one-way clutch is provided.
Even if the communication hole 9 provided in the space 3 is abolished, it is possible to sufficiently discharge and lubricate the dust in the space 75, and rather, the notches 51a and 52a Since it is located at the closest position, dust removal and lubricity are further improved, and in particular, durability of the one-way clutch is improved by improving dust removal in the space 75.

Further, the flanges 51, 5 of the retainer 5 are provided.
2 is formed by press working as described above,
The provision of the notches 51a, 52a in the flanges 51, 52 can be dealt with only by adjusting the mold. Therefore, there is an advantage that there is no increase in cost due to the provision of the notches 51a and 52a.

The present invention is not limited to the above embodiment. For example, the notches may be provided at seven or more or five or less positions on the circumference. The planar shape may be rectangular or arcuate. Further, the notch may be provided only at one end of the flange of the retainer.
The one-way clutch of the present invention is provided with a notch on the outer peripheral portion of the flange of the retainer so that a space surrounded by the outer race, the retainer, and the sprag communicates with the outside. I just want it.

[0030]

According to the one-way clutch of the present invention, the dust accumulated inside can be easily discharged without providing the outer race passage hole, and the fluidity of the lubricating oil inside can be ensured.
As a result, the durability of the one-way clutch can be maintained and improved, and the cost can be reduced as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an entire embodiment of a one-way clutch of the present invention.

FIG. 2 is an enlarged longitudinal sectional view of the one-way clutch shown in FIG. 1 according to the embodiment.

3 (a) is a left side view of the retainer in the embodiment shown in FIG. 2 as viewed from a direction A in FIG. 2, and FIG. 3 (b) is a right side view similarly as viewed from a direction B in FIG.

FIG. 4 is a left side view showing a main part of the friction plate in the embodiment shown in FIG. 2;

5A is a left side view of the outer race in the embodiment shown in FIG. 2 as viewed from a direction A in FIG. 2, and FIG. 5B is a partial plan view as viewed from a direction C in FIG.

FIG. 6 is a diagram corresponding to FIG. 1 of a conventional one-way clutch.

FIG. 7 is a diagram corresponding to FIG. 2 of a conventional one-way clutch.

[Description of Signs] 1 One-way clutch 2 Inner race 3 Outer race 31 Annular recess 32 Radial groove 33 Axial groove 4 Sprag 41 Groove 42 Concave strip 5 Retainer 51 One flange 51a Notch 52 The other flange 52a Notch 53 Holding Hole 6 Friction plate 61 Projection piece 70 Rotating shaft 71 Needle bearing 72 Starter gear 73 Rotating body 73a Bolt 74 Return spring 75 Space 80 One-way clutch 83 Outer race 85 Retainer 85a One flange 85b Other flange 86 Friction plate 9 Flow hole

Claims (4)

[Claims] A plurality of sprags are held and arranged in a cylindrical retainer between an inner race on an inner peripheral side and an outer race on an outer peripheral side rotatable about a common rotation axis, respectively. A flange that protrudes outward in the radial direction is provided at each axial end of the cylindrical portion of the retainer, and a friction plate is provided outside the one flange in the axial direction, and only one-way torque is transmitted by operating the sprag. A one-way clutch, wherein a notch is provided on an outer peripheral portion of a flange of the retainer so that a space surrounded by an outer race, a retainer, and a sprag communicates with the outside. . 2. A one-way clutch according to claim 1, wherein said notches are provided in flanges at both axial ends of a retainer. 3. The one-way clutch according to claim 2, wherein the notch is provided so as to be partially symmetrical with respect to the rotation axis with respect to the circumferential direction. 4. An outer peripheral shape of the friction plate,
4. The one-way clutch according to claim 3, wherein said one-way clutch is shaped substantially along the outer periphery of said one flange.