JP2939134B2 - One-way clutch - Google Patents

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 number of sprags are interposed between an outer race and an inner race, and the operation of the sprags transmits torque in one direction.

[0002]

2. Description of the Related Art FIGS. 9 and 10 show a conventional technique. In FIG. 9, reference numeral 1 denotes an outer race attached to a rotating side of a stator boss or the like, 2 denotes an inner race attached to a fixed side of a case or the like, and a large number of these are arranged at a predetermined pitch in the circumferential direction by a retainer 3 therebetween. Is provided. The retainer 3 is
A sheet metal material is punched and drawn by a press machine to form rectangular window holes 3a at a predetermined pitch in a circumferential direction in a short cylindrical main body, and each window hole 3a forms an outer peripheral end of the sprag 4. It is fitted and held so that it can rotate.

Each of the sprags 4 has a circumferentially extending groove 5 formed on the inner peripheral side thereof. A ring-shaped coil spring 6 is fitted into the groove 5 to urge each sprag 4 radially outward. I do. Further, as shown in FIG. 10, washer-shaped side plates 7 and 8 are arranged on both sides of the retainer 3 and the sprags 4 and fitted between the outer race 1 and the inner race 2, and the outer race 1 and the inner race 2 are connected to each other. Is held concentrically.

[0004]

In the prior art, when the outer race 1 rotates leftward in FIG. 9 and each sprag 4 rotates in the engagement direction, that is, leftward rotation, a specific error occurs due to a processing error or the like. When the sprag 4, for example, the center sprag 4a in FIG. 1 rotates leftward earlier than the other sprags 4b, the forward end of the center sprag 4a, that is, the left end 4a
-1 collides with the edge 3b (rear end) of the window hole 3a of the retainer 3, and the retainer 3 is damaged. Further, since the retainer 3 is formed in a porous cylindrical shape by a sheet metal material, there are many punched portions such as the window holes 3a, and there is a disadvantage that the material yield is deteriorated. Furthermore, since the ring-shaped coil spring 6 is fitted into the groove 5 formed on the inner peripheral side of each sprag 4, the holding force of the sprag 4 by the coil spring 6 during assembly is weak. At times, the sprags 4 are inadvertently moved in the axial direction, making it difficult to perform a smooth assembly. An object of the present invention is to provide a new one-way clutch which has solved the above-mentioned disadvantages.

[0005] In order to achieve the above object, the present invention relates to a method in which a large number of sprags are interposed between an outer race and an inner race, a retainer for fitting each sprag so as to be able to rotate at a predetermined pitch in a circumferential direction, and each sprag is engaged. In the one-way clutch having a spring biasing in the direction of rotation, each of the sprags has a front surface and a rear surface of its body formed in an arc surface centered on the rotation center of the sprag, and the retainer has a pair of washers. With the side plates facing each other concentrically, each side plate is integrally fixed at both ends of a number of pins arranged at a predetermined pitch in the circumferential direction and
A large number of partitioned windows are formed, and each sprag is
Is held by fitting . Further, each of the pins has a circumferential interval slightly smaller than the maximum circumferential width of the body of the sprag, and the sprag is fitted into the window.
A groove may be formed in the outer peripheral portion of each of the sprags so as to extend in the circumferential direction, and a ring-shaped spring may be fitted into each groove.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional side view of a one-way clutch according to an embodiment of the present invention, FIG. 2 is a cross-sectional side view of a main part showing an assembled state of a sprag and a retainer according to the present invention, and FIG.
It is III sectional drawing. In FIG. 1, A is a one-way clutch, in which a number of sprags 12 are interposed between an outer race 10 attached to a rotating side such as a stator boss and an inner race 11 attached to a fixed side such as a case.
Each sprag 12 is held at a predetermined pitch in the circumferential direction by a retainer 15, and each sprag 12 is urged by a ring-shaped spring 21 to rotate in the engagement direction, that is, in the counterclockwise direction (A) in FIG. 1.

Each of the sprags 12 has a front surface 1 of its body.
2a (the left surface in FIG. 1) and the rear surface 12b (the right surface in FIG. 1) have a radius r about the center O1 of rotation of the sprag.
1 and r2 are formed on a circular arc surface.
5 is fitted into the window 15a. In addition, each of the above sprags 1
2, when the outer race 10 rotates counterclockwise around the rotation center O1 due to the counterclockwise rotation of the outer race 10, the height in the radial direction increases, and the outer peripheral surface 12c and the inner peripheral surface 12d become higher. When the outer race 10 is pressed against the inner peripheral surface 10a of the outer race 10 and the outer peripheral surface 11a of the inner race 11 and rotated clockwise (idling direction) by the clockwise rotation (slip direction) of the outer race 10, the outer race 10 rotates clockwise (a) about the rotation center O1. The height of the outer race 10 and the inner race 11 is disengaged from the pressure contact with the outer race 10 and the inner race 11.

Each of the sprags 12 has a groove 13 extending in the circumferential direction on the outer peripheral side, and the bottom surface of the sprag 12 has a left end 13a (counterclockwise) radially outward from a right end 13b (clockwise). Tilt as shown. A ring-shaped spring 21 of a coil spring is fitted into each of the grooves 13 and pressed against the left end 13 a of the groove 13. The center is rotated in the counterclockwise direction (A), that is, in the engagement direction.

As shown in FIGS. 4 to 6, the retainer 15 has a pair of side plates 17, 18 concentrically facing left and right, and these side plates 17, 18 are arranged at a predetermined pitch in the circumferential direction. The left and right ends of the multiple pins 16 are integrally connected. That is, the side plates 17, 1
Reference numeral 8 denotes a washer formed by punching a steel plate so that the outer circumference is close to the inner circumferential surface 10a of the outer race 10 and the inner circumference is close to the outer circumferential surface 11a of the inner race 11, and each side plate 17, 18 is formed. Pin holes 19 are drilled at a predetermined pitch in the circumferential direction at the center in the radial direction, and these side plates 17 and 18 are arranged concentrically, and the steel wire is cut into a predetermined length in the opposing pin holes 19. Both ends of the pin 16 are butted and welded.

As a result, each of the side plates 17, 1
8 are integrally fixed, and a number of windows 15a are formed in the circumferential direction by the pins 16, and the sprags 12 are fitted and held by the windows 15a. In addition, engaging pieces 20 projecting radially outward are formed at three locations on the outer peripheral portion of each of the side plates 17 and 18. This engagement piece 20 is the outer race 1
0 by frictional engagement with the inner peripheral surface 10a of the side plate 17,
18, and thus for locking the one-way clutch A to the outer race 10 side.

Each of the pins 16 is arranged along the right axis of a locus circle C passing through the center of rotation O1 of each sprag 12, and the circumferential distance L1 is set to the maximum width of the body of the sprag 12 in the circumferential direction. The sprags 12 are formed slightly smaller than L, and prevent the sprags 12 inserted from the outer peripheral side from coming out in the axial direction. Then, the spring 21 is moved from the outer peripheral side to each sprag 1.
By fitting the spring 21 into the groove 13 of the
When the one-way clutch A is assembled between the outer race 10 and the inner race 11, the sprags 12 are sandwiched between the outer race 10 and the inner race 11, thereby facilitating the assembly.

The pin 16 and each side plate 1
As shown in FIG. 6, the pins 16 may be fixed to the ends 7 and 18 by conical end pieces 16 a at both ends of the pins 16, and the slopes thereof may be brought into contact with the inner edges of the pin holes 19 to perform resistance welding. As shown in FIG. 7, both ends of the pin 16 may be arc-shaped end pieces 16b, and the arc surface thereof may be brought into contact with the inner edge of the pin hole 19 for resistance welding. Further, as shown in FIG. As described above, the conical concave portion 19a may be formed at the fixing portion of the pin 16 of the side plates 17 and 18, and the conical end piece 16a of the pin 16 may be fitted into the concave portion 19a to perform resistance welding. .

According to the above embodiment, the front surface 12a and the rear surface 12b of the body of each sprag 12 are formed in an arc surface centered on the rotation center O1 of the sprag 12, and the sprags 12 are arranged in the circumferential direction. Since the pins 16 are arranged along the locus circle C passing through the rotation center O1 of each sprag 12, even if the sprags 12 rotate irregularly due to a processing error or the like, the retainer 15, that is, the pin 16 is rotated. Stop attacking.

Further, the inner peripheral side of each sprag 12 is held by a high-strength pin 16, and a spring 21 is fitted into a groove 13 formed on the outer peripheral side of each sprag 12.
Each sprag 12 is held in the window 15a by the pin 1 and the pin 16, so that the sprags 12 do not inadvertently move in the axial direction during assembly, and the one-way clutch A is connected to the outer race 10 and the inner race 10. 11 can be easily and quickly performed.

The outer race 10 and the inner race 1
1 and between the side plates 17 and 18 which concentrically hold
Pins 16 cut to a predetermined length are arranged in the circumferential direction, and both ends thereof are integrally connected to the side plates 17 and 18 to form a window portion 15a in which the sprags 12 are fitted and held by the pins 16. As a result, the window portion 15a can be formed with simple components, so that the productivity is increased, and the material yield is improved and the material cost is reduced.

[0016]

Effects of the Invention According to the present invention, it increases the durability of the retainer made by the side plates and the pin
You. Also, such a retainer has a good material yield.
Thus, material costs are reduced and productivity is increased. According to the invention of claim 2, the sprags are inadvertently moved in the axial direction.
It does not move and the one-way clutch is easily assembled .

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of a one-way clutch showing an embodiment of the present invention.

FIG. 2 is a partially sectional side view showing an assembled state of a sprag and a retainer according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a partial side view of a retainer showing the embodiment of the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is an enlarged sectional view showing a fixed state of a pin and a side plate according to one embodiment of the present invention.

FIG. 7 is an enlarged sectional view showing a fixed state of a pin and a side plate according to a second embodiment of the present invention.

FIG. 8 is an enlarged sectional view showing a fixed state of a pin and a side plate according to a third embodiment of the present invention.

FIG. 9 is a partial cross-sectional side view of a one-way clutch showing a conventional example.

FIG. 10 is a sectional view taken along line XX of FIG. 9;

[Explanation of symbols]

 A one-way clutch 10 outer race 10a inner peripheral surface 11 inner race 11a outer peripheral surface 12 sprag 12a front surface 12b rear surface 12c outer peripheral surface 12d inner peripheral surface 13 groove 13a left end 13b right end 15 retainer 15a window portion 16 pin 16a end piece 16b end piece Plate 18 Side plate 19 Pin hole 19a Depression 20 Engagement piece 21 Spring L, L1, interval

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16D 41/07

Claims (2)

(57) [Claims] A plurality of sprags between an outer race and an inner race, a retainer for fitting each sprag so as to be able to rotate in a circumferential direction at a predetermined pitch, and a spring for urging each sprag to rotate in an engagement direction. In the one-way clutch having the sprags, the front surface and the rear surface of each sprag are formed in an arc surface centered on the rotation center of the sprag, and the retainer faces a pair of washer-shaped side plates concentrically. , Each side plate is integrally fixed at both ends of a large number of pins arranged at a predetermined pitch in the circumferential direction to each pin.
Therefore, a large number of windows are formed in the circumferential direction,
A one-way clutch wherein a lug is fitted and held in the window . 2. Each of the pins has a circumferential interval slightly smaller than the circumferential maximum width of the body of the sprag, and the sprag is fitted and held in the window , and The one-way clutch according to claim 1, wherein grooves extending in a circumferential direction are formed in an outer peripheral portion of the sprag, and a ring-shaped spring is fitted in each groove.