JP2939168B2 - One-way clutch sprag holding device - 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 torque is transmitted in one direction by the operation of the sprags. The present invention relates to a sprag holding device that holds sprags in a ring shape.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show a conventional technique. 5 and 6, 1 is an outer race, 2 is an inner race coaxially fitted in the outer race 1, and is arranged at a predetermined pitch in the circumferential direction by a retainer 6 between the outer race 1 and the inner race 2. A number of sprags 3 are interposed. Each sprag 3 has a groove 4 extending in a circumferential direction with respect to a retainer 6 on an inner peripheral side thereof, and the retainer 6 has flanges 6b projecting radially outward at both ends of a cylindrical body. A rectangular holding hole 6a is formed in the body at a predetermined pitch in the circumferential direction.

Then, the sprags 3 are fitted into the respective holding holes 6a of the retainer 6 from the inner peripheral side, and the grooves 4 of the sprags 3 are formed.
A return spring 5 composed of a ring-shaped coil spring is fitted into the spring, and the bottom of the return spring 5 is pressed outward in the radial direction to press and lock each sprag 3 into the holding hole 6a of the retainer 6 from the inner peripheral side. The sprags 3 are arranged and held in a ring shape, and are interposed between the outer race 1 and the inner race 2 in this state.

[0004]

In the prior art, each sprag 3 is fitted into the holding hole 6a of the retainer 6 from the inner peripheral side, and the return spring 5 is fitted into the groove 4 of each sprag 3; Each sprag 3 is pressed radially outward by the return spring 5 and held in a ring shape. When the sprags 3 are assembled between the outer race 1 and the inner race 2, the sprags 3 are moved in the axial direction. When the sprags 3 are pressed, the sprags 3 are detached from the retainer 6 in the axial direction and must be reassembled again, which has the disadvantage that the assembling requires skill and trouble. In addition, when some sprags are thinned out to correspond to a small capacity model, the gap between the sprags in the thinned portion becomes large, and FIG.
As shown in the figure, the return spring 5 is locally bent outward between the thinned front sprag 3a and the rear sprag 3b, and the rear sprag 3b is moved with respect to the front sprag 3a. Therefore, there is a disadvantage that the rotation is urged in the opposite direction (the direction of arrow A) and the operating torque as a one-way clutch becomes unstable. An object of the present invention is to provide a sprag holding device for a one-way clutch which has solved the above-mentioned disadvantages.

[0005]

Means for Solving the Problems The present invention is configured as follows to achieve the above object. That is, a groove extending from the outer peripheral side to the axial center and extending in a direction perpendicular to the axis is formed in the axially intermediate portion of the short and columnar sprag main body, and the columnar pin is formed in the axial center of the sprag main body. A sprag is formed by penetrating and projecting both ends from both ends in the axial direction of the sprag main body, and an axially intermediate portion of the pin is exposed at the bottom of the groove. Window holes are formed in the bottom wall mainly of the retainer at a predetermined pitch in the circumferential direction, and slits extending from the inner peripheral portion toward the outer peripheral end thereof on both side walls of the retainer mainly are formed at the same pitch as the window holes in the circumferential direction. A retainer is provided, and the main body of the sprag is fitted into each window hole of the retainer,
Both ends of the pin of the sprags allowed rotatably fitted in the slits of the retainer, with fitting the annular return spring into the groove of the sprags, Rita pins in the groove
The spring is pressed and urged in the axial direction of the retainer by the tension of the spring . In this case, it is preferable to form an inclined surface on the outer periphery of the pin in the groove of each sprag where the engagement rotation side of the sprag becomes higher.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an essential part of a one-way clutch according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view taken along the line II-II.
1 and 2, reference symbol A denotes a one-way clutch interposed between an outer race 10 and an inner race 11 coaxially fitted, and a large number of steel sprags 12 are circumferentially fixed by steel plate retainers 17. In the direction at a predetermined pitch,
Each sprag is rotated by the return spring 20 in the engagement direction (the direction of arrow A).

The sprags 12 are as shown in FIGS. 2 and 3. That is, a groove 14 into which the return spring 20 can be fitted is formed in the axially intermediate portion of the short and columnar sprag main body 13 having a predetermined cross-sectional shape.
The groove 14 extends from the outer peripheral side of the sprag main body 13 to the axial center and extends in a direction perpendicular to the axis of the sprag main body 13. Further, the columnar pin 15 is inserted through the axial center portion of the sprag main body 13 by press-fitting, and both ends 15
a is projected from both axial ends of the sprag main body 13, and an axially intermediate portion of the pin 15 is exposed at the bottom of the groove 14. The pin 15 has a flat surface 16 that is flatly cut over its entire length on the outer periphery of the upper part thereof.
As shown in FIG. 2, the flat surface 16 is
Of the sprag main body 13 while being inclined so that the left edge 16a of the flat surface 16 becomes higher.

The retainer 17 is, as shown in FIG.
A rectangular window hole 18 into which a main portion of the sprag 12 is loosely fitted is formed at a predetermined pitch in a circumferential direction on a bottom wall 17a mainly composed of a retainer having an annular and groove-shaped cross section with an open outer peripheral surface. A number of slits 19 are formed in both side walls 17b of the sprag 12 so that both ends 15a of the pin 15 of the sprag 12 are rotatably fitted. The slits 19 are formed to extend radially from the inner peripheral portion to the outer peripheral end of each side wall 17b, and the pitch in the circumferential direction is formed at the same pitch as the window hole 18.

The main body of the sprag 12 is fitted into each window hole 18 of the retainer 17, and both ends 15 a of the pin 15 of the sprag 12 are rotatably fitted into each slit 19 of the retainer 17, and the A return spring 20 composed of a coil spring formed on the sprag 12 is fitted into the groove 14 of each sprag 12 from the outer peripheral side, and the pin 1 in the groove 14 is formed by the tension of the return spring 20.
5 is pressed and urged in the axial direction of the retainer 17, and the sprags 12 are arranged and held in a ring shape. Then, in this state, it is interposed between the outer race 10 and the inner race 11 described above.

According to the above embodiment, the sprags 12 are arranged and held in a ring shape by the retainer 17 via the return spring 20 to be in a unit state. In addition, since both ends 15a of the pin 15 of each sprag 12 are locked in each slit 19 of the retainer 17, each sprag 12
Is pressed in the axial direction, the sprags 12
From the axial direction. For this reason, the sprags 12 can be interposed between the outer race 10 and the inner race 11 while being pressed in the axial direction without bothering, and the assembly between the outer race 10 and the inner race 11 can be easily performed. Become.

Since the return spring 20 presses and locks each sprag 12 from the outer peripheral side to the retainer 17 with a tension, even if some sprags are thinned out in order to correspond to a small capacity model. In this thinned portion, the return spring 20 does not locally bend outward as in the related art, and the rear sprag is not urged to rotate in the opposite direction to the front sprag. For this reason,
Even if the sprags are thinned, the operating torque as a one-way clutch is stabilized.

The pin 1 penetrating through the sprag main body 13
5, a flat surface 16 is formed on the left edge 1 located on the engagement rotation side of the sprag 12, as shown in FIG.
6a, the return spring 20 is attached to each sprag 1 after assembly.
In the second groove 14, the left edge 16a of the flat surface 16 is pressed to urge each sprag 12 to rotate in the engaging direction. For this reason, it is not necessary to form the bottom surface of the groove 14 in a mountain shape having a top for receiving the return spring 20 at a position located on the engagement rotation side of the sprag 12, thereby increasing productivity.

[0013]

As is apparent from the above description, according to the present invention, the small sprag can be interposed between the outer race and the inner race in a state where the sprag is incorporated in the retainer, and the sprag can be moved in the axial direction of the retainer. , The sprags are not detached from each other, so that the sprags can be easily assembled between the outer race and the inner race. In addition, since the sprags can be appropriately thinned out corresponding to a small-capacity model, compatibility is improved. In addition, the pin that locks the sprag on the retainer is formed with a slope with a higher sprag engagement rotation side, and a return spring is brought into contact with the higher edge of this slope to bias each sprag in the engagement direction. As a result, there is no need to perform complicated processing on the sprags, and effects such as an increase in productivity can be obtained.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view taken along the line II-II of FIG.

FIG. 3 is a sectional view of the sprag taken along line III-III in FIG. 2;

FIG. 4 is a partial perspective view of a retainer according to the present invention.

FIG. 5 is a sectional side view of a main part of a one-way clutch showing a conventional example.

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5;

FIG. 7 is a sectional front view of a main part in a state where sprags are thinned out.

[Explanation of symbols]

 A one-way clutch 10 outer race 11 inner race 12 sprag 13 sprag main body 14 groove 15 pin 15a both ends 16 flat surface 16a left edge 17 retainer 17a bottom wall 17b side wall 18 window hole 19 slit 20 return spring

Claims (2)

(57) [Claims] A groove extending from an outer peripheral side to an axial center and extending in a direction perpendicular to the axis is formed in an axially intermediate portion of a short and columnar sprag main body, and a columnar pin is connected to the sprag main shaft. A sprag is formed by penetrating the core and projecting both ends thereof from both ends in the axial direction of the sprag main body, and exposing an axial middle portion of the pin to the bottom of the groove, and an annular and cross-sectional surface having an open outer peripheral surface. Window holes are formed at a predetermined pitch in the circumferential direction on the bottom wall mainly composed of the grooved retainer, and slits extending from the inner peripheral portion to the outer peripheral end thereof on both side walls of the retainer mainly are formed in the circumferential direction with the window holes. A retainer formed at a pitch is provided, a main body of the sprag is fitted into each window hole of the retainer, and both ends of a pin of the sprag are rotatably fitted into each slit of the retainer, and an annular return spring is formed. Each sp A sprag holding device for a one-way clutch, wherein a pin in the groove is fitted in a groove of the lug and is pressed and urged in the axial direction of the retainer by the tension of a return spring. . 2. The outer periphery of a pin in a groove of each sprag,
2. The sprag holding device for a one-way clutch according to claim 1, wherein a slope is formed such that the engagement rotation side of the sprag becomes higher.