Six-column roller overrunning clutch

Abstract

The invention discloses a six-column roller overrunning clutch. The six-column roller overrunning clutch comprises an outer cover, a body and a gasket. The outer cover is provided with a circular groove. The bottom of the circular groove is provided with a center hole. The body is in a circular ring shape and is mounted in the circular groove. The body is provided with six notches as raceways. A roller and a flat spring are mounted in each raceway. The rollers and the flat springs are arranged alternately in the circumferential direction, so that the rollers move in the same direction under the action of the flat springs and centrifugal force. The gasket is in a circular ring shape. The outer cover, the body and the gasket are connected into a whole. The gasket covers the body to prevent the rollers and the flat springs from falling off. According to the six-column roller overrunning clutch, as only six rollers and the raceways are in rolling friction, the friction strength is greatlyreduced, and the wedge-caulking failure time is delayed; the rollers can roll freely in the raceways and can still keep round after being abraded; the contact points of the rollers making contact withan inner ring and an outer ring are different in a wedge-caulking state and in a separated state. The rollers are abraded uniformly.

Description

technical field [0001] The invention relates to an overrunning clutch, in particular to a six-column roller type overrunning clutch for motorcycles or tricycles with large displacement. Background technique [0002] The overrunning clutch is an important part used for power transmission and separation between the prime mover and the working machine or between the driving shaft and the driven shaft inside the machine. There are three types of overrunning clutches: wedge overrunning clutches, roller overrunning clutches, and ratchet overrunning clutches. Among them, sprag overrunning clutches are placed between the rollers between the inner ring and the outer ring (raceway). A large number of wedge-shaped elements (wedges) can transmit torque in one direction when turning, and have relative idling performance in the other direction. , in order to transmit torque, otherwise it is relative sliding, this kind of sliding state that rotates at their respective speeds and does not ...

AI Technical Summary

Problems solved by technology

There are three types of overrunning clutches: wedge overrunning clutches, roller overrunning clutches, and ratchet overrunning clutches. Among them, sprag overrunning clutches are placed between the rollers between the inner ring and the outer ring (raceway). A large number of wedge-shaped elements (wedges) can transmit torque in one direction when turning, and have relative idling performance in the other direction. , in order to transmit torque, otherwise it is relative sliding, this kind of sliding state that rotates at their respective speeds and does not transmit torque is called "overrunning"; the roller type overrunning clutch is mainly composed of outer hub, star wheel, roller and spring When working, the roller is always in contact with the outer hub and the star wheel under the pressure of the spring. When the outer hub rotates counterclockwise as the active part or the star wheel rotates clockwise as the active part, the clutch engages, otherwise it is in an overrunning state ;The ratchet type overrunning clutch is mainly composed of a ratchet wheel and a pawl, and its outer dimension is large. In order to reduce the size, it is usually installed on a high-speed shaft, but the noise is relatively large.

[0003] Most of the large-displacement motorcycle and tricycle clutches currently on the market use sprag-type overrunning clutches, such as sprag-type overrunning clutches figure 1 a and figure 1 As shown in b, in the figure, 10 is the outer ring, 20 is the wedge, 30 is the preload spring, and 40 is the inner ring. Due to: (1) the number of wedges is large, when the wedges are in contact with the inner and outer raceways, It is easy to wear small planes and inner and outer raceways; (2) The number of wedges is large, and there are many contact points with the raceways, which increases the probability that metal shedding due to friction cannot be discharged quickly, resulting in metal shedding and wedges, raceways Friction is generated, which accelerates the wear of the wedge and the raceway; (3) due to the small locking depth of the wedge, the raceway is easy to slip after wear, and if the wear exceeds a certain range, the product cannot meet the three guarantee requirements, which increases the company's (4) There are many contact points between the wedge and the raceway, which is prone to whistling and expensive; (5) In the case of extreme overload work, one or several wedges may rotate beyond the maximum support line range, As a result, the wedge turns over, and when the torque is reduced, the wedge cannot be reset

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