SU1661515A1 - Overrunning clutch - Google Patents

Abstract

This invention relates to mechanical engineering, in particular, to free-wheeling mechanisms of a starting engine reducer. The purpose of the invention is to simplify the design, reduce the axial dimensions and increase reliability. The mechanism contains a clip 2, an asterisk 3 with wedge grooves 4, in which the rollers 5 are mounted. The rollers 5 are pressed into a narrow part of the wedge grooves 4 with clamps (P) 6. At the ends of the asterisk 3 are annular grooves 9 and 10. P 6 is designed as an arc-shaped a leaf spring provided with elastic petals (L) 11 - 14 arranged in pairs at the ends. Between L 13 and 14 there is a clamp (F) 15. L 11 and 12 are tensioned in annular grooves 9 and 10, and L 13 and 14 cover roller 5 from the ends, limiting its axial movement. The F 15 surface is cylindrical in shape and prevents the roller from moving relative to P 6 in idle mode. When the sprocket 3 rotates, the rollers 5 under the action of P 6 are wedged between the sprocket and the yoke. Coupling transmits torque. With an increase in the rotational speed of the sleeve 2, the rollers 5 compress the F 6 through the F 15. The idle stroke takes place. To reduce friction between the roller and the clamp, on the working surface F 15, protrusions are made in the form of zigos facing the roller. 1 hp f-ly, 4 ill.

Description

This invention relates to mechanical engineering, in particular, to free-wheeling mechanisms of a starting engine reducer. “The aim of the invention is to simplify the design and increase the reliability of the free wheeling mechanism.

. Figure 1 shows the free wheeling mechanism, a general view; Fig 2 - section aa in Fig 1; nafig.Z- clip roller freewheel; Fig. 4 shows a retainer for the position of the roller, an embodiment.

The free-wheeling mechanism contains a holder 2 mounted on the driven shaft 1

and an asterisk 3, between which in the wedge grooves 4 asterisks are installed the rollers 5, loaded in the direction of jamming by the clamps 6 in the form of flat springs. At the ends 7 and 8, the asterisks 3 (Fig. 2) are provided with annular grooves 9 and 10. The clamp 6 is made with elastic petals 11-14 in pairs and a roller position latch 15. Petals 11 and 12 are placed in the grooves 9 and 10 at the ends of the sprocket and hold the pressure on the latter, while the petals 13 and 14 cover the roller 5 from the ends and limit its axial movement. Poo

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the surface of the latch 15 of the roller position, which is in contact with the roller, is cylindrical in shape and prevents the roller from moving relative to the clamp when the mechanism is in free-running mode. The roller 5 is housed in a slot formed by the petals 13 and 14 and the latch 15 of the roller position rotatably. To reduce the contact surface of the roller and clamp the working surface of the roller positioning lugs, protrusions can be made in the form of zigos 16 which are convex facing the roller.

The width of the clamp is chosen to be less than the width of the sprocket, which prevents its contact with other parts of the mechanism along the generatrix.

The free wheeling mechanism works as follows.

When the sprocket 3 rotates, the rollers 5 under the action of the clamps 6 roll up into a narrow part of the space between the sprocket and the yoke and become wedged between them. In this case, the yoke 2 with the driven shaft 1 rotates together with the sprocket 3. The constant contact of the rollers 5 with the working surfaces of the sprocket and the yoke is provided by individual spring clamps 6. Petals 11 and 12 installed in the annular grooves on the ends of the sprocket, the clamp is fixed on the asterisk and by the blades 13 and 14, the rollers 5 at the ends are kept from axial movement and contact with other parts of the mechanism. Since the width of the clamp is less than the width of the sprocket, it does not concern other parts of the device.

If the frequency of rotation of the yoke 2 becomes greater than the frequency of rotation of the sprocket 3, then the rollers 5, under the action of centrifugal force, will act on the lock, compress the clamps 6, roll out-. c into the wider part of the wedge groove 4 and the rotational transmission chain is broken.

Since the clamps in the slots of the mechanism are held by means of a pair of elastic petals 11 and 12 placed in the annular grooves 9 and 10, the sprocket 3, and the rollers from

the axial movements are held by the lobes 13 and 14, then additional parts are not needed for their installation in the device.

Since the rollers in the grooves move with the springs, their ends do not

touch the other parts of the device and do not warp, then conditions are created for simultaneous jamming of all the rollers and more even distribution of the load between them, which increases the reliability and durability of the free wheeling mechanism.

The proposed free wheeling mechanism simplifies the assembly technology and increases reliability and durability.

Claims (2)

1. Free-running mechanism containing a clip, an asterisk, rollers located between them in the wedge grooves, spring-loaded in the narrow part of the wedge grooves individual clamps in the form of plate springs, characterized in that, in order to simplify the design and increase reliability, annular grooves are made at the ends of the sprocket, each spring is made with two pairs of petals arranged parallel to the spring edges of the roller in the form of a curved the radius corresponding to the radius of the roller the end portion, the middle part of the spring is arcuate, the retainer covers the cylindrical surface of the roller, one pair of petals contact the end surfaces of the roller, and the other - installed with tension in the annular grooves of the sprocket. 2. The mechanism according to claim 1, characterized in that, in order to reduce the contact surface of the clamp and the roller, the working surface of the lock is made with protrusions. 1 LL eight 2 13 12 Fig.Z 13 15 P Fig.C