RU2258845C1 - Ratchet free-wheel clutch with symmetrical gearing - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: ratchet free-wheel clutch has dogs whose numbers exceeds the number of teeth. Outer race 1 comprises the even number of teeth with step t for the inner engagement. Inner race 2 has dogs made of wedging rods 3 arranged in pair diametrically opposite with step N = t (1 - 1/z), where z is the number of pairs of the dogs.

EFFECT: enhanced reliability.

2 dwg

Description

The invention relates to mechanical engineering and can find application, in particular, in ratchet freewheeling mechanisms of inertial transformers.

Known ratchet freewheeling mechanism for inertial transformers, consisting of a housing, several retaining plates and springs and ratchet, providing the ratchet rotation in only one direction (see utility model certificate No. 13405, class F 16 H 27/02, 2000 )

The closest in technical essence to the claimed invention is a ratchet freewheeling mechanism (see patent No. 2138707, class F 16 D 41/12, 1997), containing an outer race, an inner race concentrically located on the shaft, flexible wedging rods in contact one ends with the inner cage, and the other ends fixed in the outer cage. The inner ring is made in the form of a block of several identical ratchet disks rigidly connected to each other and offset relative to each other by an angular pitch equal to the ratio of the angular pitch of the ratchet disk to the number of ratchet disks. Each ratchet disk has its own elastic wedging rod of the wedge rod package having a common axis of rotation installed in the outer cage. Each elastic wedging rod is pressed against the inner ring by its spring.

When the shaft with the inner race is rotated, one of the elastic jamming rods engages with the ratchet tooth, the end of which is closest to the tooth end of the corresponding ratchet disk.

The disadvantages of this solution include a significant load on the shaft supports on which the inner race is mounted due to the ratchet disk closing with only one of the elastic wedging rods.

In addition, the elastic jamming rod during jamming causes a long oscillatory process.

The presence of springs, pressing elastic wedging rods to the surface of the inner cage, complicates the design and reduces its reliability.

The objective of the proposed solution is to eliminate these disadvantages.

This is achieved by the fact that in the ratchet freewheel mechanism containing the outer race, the concentric shaft with the inner race and the jamming rods interacting with them, the ratchet teeth are located on the inner surface of the outer race, and the jamming rods are located on the outer surface of the inner race, diametrically opposed in pairs, with a step different from the pitch of the ratchet teeth by an amount equal to the ratio of the pitch of the ratchet teeth to the number of pairs of jammed rods. The number of teeth on the outer race is even. The jammed rods are made rigid in both longitudinal and transverse directions.

The proposed solution allows to eliminate a significant load on the shaft bearings when the outer cage is closed with inelastic jamming rods, since when the circuit is closed, two diametrically oppositely installed jamming rods are switched on, completely eliminating the load on the shaft bearings.

Rigid jamming rods do not have elastic deformation and therefore do not cause oscillations of the shaft with the inner cage.

Fastening jammed rods on the outer surface of the inner race allows the use of centrifugal forces when jamming the outer and inner rings, pressing the jammed rods to the surface of the ratchet teeth. This eliminates the pressure spring.

Figure 1 shows the ratchet mechanism with a symmetrical closure, front view, figure 2 is a top view.

The ratchet mechanism with a symmetrical closure consists of an outer ring 1 with an even number of internal gear teeth with a pitch t, an inner ring 2 with jamming rods 3 arranged in pairs diametrically opposite with a pitch N equal to

where z is the number of pairs of inelastic wedging rods.

The inner race 2 is mounted on the shaft 4. When the shaft 4 and the inner race 2 are rotated, the jamming rods 3 with their free ends slide along the surfaces of the ratchet teeth and are pressed against them by centrifugal forces, the stronger the higher the shaft rotation speed. Due to the diametrically opposite location of each pair of jammed rods 3, one of the pairs is simultaneously jammed. Reactions from jammed rods 3 of this pair, equal in magnitude and opposite in direction, create only a reactive moment on the shaft, freeing the shaft bearings from the load.

Claims (1)

A ratchet freewheel with a symmetrical closure, containing an outer race, a shaft concentrically located with an inner race and jamming rods interacting with them, characterized in that the ratchet teeth are located on the inner surface of the outer race, and jamming rods are located on the outer surface of the inner race opposite with a pitch different from the pitch of the ratchet teeth by an amount equal to the ratio of the pitch of the ratchet teeth to the number of pairs of jammed rods, the number of teeth on the outer race is even, and the jamming rods are rigid in the longitudinal and transverse directions.

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