CS214918B1 - Centrifugal clutch - Google Patents

Abstract

Centrifugal clutch suitable for automatic connection of the driving and driven parts of coaxial mutually rotating members, multi-stage automatic transmissions of motor vehicles. The purpose of the invention is to ensure quietness and smoothness of the clutch engagement and advantageous functional properties with minimal space requirements when installing the clutch. The stated purpose is achieved by a centrifugal clutch, the elastic strips of which 6 are suspended on the suspension pin 7 of the jaws 1, attached to the bottom 8 of the carrier 2 of the jaws 1, are guided by a pin 9 of the jaws 1 extending into the longitudinal recess 10 of the bottom 8, while at the end protruding from the flywheel 15 the pin 9 is provided with a ring 11. The invention is best characterized by Fig. 2.

Description

2

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jaw centrifugal coupler which is suitable for self-soldering a driving and driven portion of co-axially rotating members, in particular a geared motor or a higher gear step-step automatic transmission motor vehicle.

Wholly centrifugal clutches, in particular with extending gripping jaws, are in the area of rotation of the drive part close to the speed at which the centrifugal force is in balance with the force of the return springs, a considerable noise is generated when the drive aggregate runs unevenly alternating thrusting on the functional surface of the clutch drum and the crank stops. The clutch engagement noise is eliminated by providing a damping mass to the rest, but does not address the additional requirement of optimum function, namely to achieve a certain hysteresis of the clutch function such that the clutch engagement speed is higher than the start clutch slip speed. . This hysteresis is achieved by various methods, in particular by the choice of friction material and by a higher static coefficient than the dynamic, or certain passive resistances, between the jaw carrier and the jaws. Choosing a friction material with a higher static friction coefficient than dynamic ensures the desired hysteresis, but does not reliably address the noise of the engaging jaws endangering the smoothness of engagement in the clutch closing phase. By inducing passive resistances between the jaws and the gripper, it achieves the desired hysteresis while ensuring the silence and smoothness of the clutch engagement, but in the known embodiments, the passive elements inducing the cavities in the cavities are, for example, a reaction force on the jaws pressed by the spring force. the retaining member is a support member or former passive resistances induced by the preload member retained on the jaw carrier by the jaws of the gripper, but in both methods the dimensions and weight of the clutch increase without increasing the clutch capability to transmit larger performances.

These drawbacks are eliminated by the centrifugal clutch according to the invention, characterized in that the flexible pre-bent strips hinged on the hinge pin of the jaw, attached to the bottom of the gripper carrier, are guided by a collar extending into the longitudinal recess of the gripper jaw, the end of the pin extending from the flywheel it has a ring. The advantages of the centrifugal clutch, according to the invention, in the small required dimensions and low mass of the clutch for transmitting a certain power at the desired clutch switching speed, with the clutch silence and smoothness, and the advantageous performance characteristics given by the hysteresis between the drive part rotation and clutch speed. since all the elements by which the centering clutch is provided to achieve hysteresis, smoothness and silence of engagement of the clutch increase in weight by centrifugal action of the jaws, these elements being built with a minimum of space requirement if the gripper is a frequent For example, a combination of a start and start clutch, the elements used to achieve hysteresis can be incorporated in such a way that the built-up space in the clutch capability of transmitting higher power is not increased.

1 shows a cross-sectional view of a centrifugal clutch according to the invention, FIG. 2 shows a cross-sectional view of the centrifugal clutch axis, FIG. 3 shows a front view of the centrifugal clutch on the side of the gripper; Fig. 4 is a cross-sectional view of a flexible element along one of the jaws;

The centrifugal clutch consists of a carrier 2-body 1, which is secured to the drive shaft 4 by its hub 14 and the drum 3 provided with the driven shaft 5. The hinge pins 7 of the bottom 8 of the carrier 2 are hinged jaws 1 provided with return springs 13. The elastic bands 6 are hinged on the hinge pins 7 and are provided with a circumferential groove 12 by which the elastic biased strips 6 are carried in the radial direction by means of pins 9, fixedly attached to the jaw 1 that is, when deflecting the jaws of the hinge pins 7 by the effects of centrifugal force or return springs 13, the resilient bands 6 of the individual jaws 1 move as well as the jaws 1 and the weight of the elastic biased strips 6 increases the centripetal force effects of the jaws 1. The pins 9 extend into the longitudinal recesses 10 of the bottom 8a they are provided with a ring 11, which is the bottom 8 separated from the elastic pre-biased strips 6. The pre-tensioned spring bands 6 are retained by the rings 11. As a part of the gripper 2, a flywheel 13 of the rough ring is formed, engaging the drum 3. The centrifugal clutch is disengaged to a certain speed of the carrier 2 to which the centering the force of the jaws 1 and the elastic members 6 does not overcome the effects of the return springs 13a of the passive resistances caused by the elastic biased straps 6. The passive resistances induced by the elastic biases 6 are proportional to the bias of the biasing elastic bands 6 opposed between the jaws 1 and 8, the coefficient of friction elastic bias. tapes 6 and ring

Claims (1)

3 11 at the bottom 8 and the spacing of the pin 9 from the hinge pin 7. If, after increasing the speed of the drive shaft 4, the centrifugal force of the jaws 1a of the elastic pre-biased strips 6 overcomes the effects of the return springs 13 and the passive resistors of the elastic pre-bent strips 6, 1 together with the elastic folded straps 6 in the direction of application of the centrifugal force and the lining 16 by the jaw 1 abut against the drum 3 which is in the abutment on the drum 3 at the moment of insertion of the housing 16. The shifting jaws 1 follow the unevenness of the drum 3d by the circumferential throw and the flute 3, while the relative movement of the jaws 1 relative to the bottom 8 occurs and during one relative rotation of the driver 2 relative to the drum 3, the jaw 1 returns to the starting position of the bottom 8, i.e. the total friction of the passive resistances caused by the action of the resilient pre-biased strips 6 is zero in the current relative speed and therefore the susceptible resistances from the resilient pre-biased bands 6 to the function of the slipping clutch. that the flexible pre-bent strips (6) attached to the hinge pin (7) by the jaws (1) do not exhibit, and the resilient pre-bent strips (6) affect the function of the shifting clutch by the effects of centrifugal force. The passive resistances of the resilience of the resilient pre-tensioned strips 6a appear only on the function of the coupling when the jaws 1 in the flank against the bottom 8 of the carrier 2, which is only when the starting clutch is opened or closed, thus inducing a certain degree of stitching. of the unlocked clutch liner 16 with the drum 3 at a relatively higher driving speed of the driver 2 and at the beginning of the rearward clutch engagement at the speed of the driver 2 relative to the lower. This positively affects the operation properties of the clutch, reduces the necessary weight of the clutch and prevents the noisy clutch engagement at the speed of the carrier 2, in which the effects of the return springs 13 are close to the centering effect of the jaws 1 by not allowing the jaws 1 to bounce due to the change of centrifugal effects of the jaws 1 of the flush-fitting carrier 2 attached to the bottom (8) of the carrier (2) by the jaw (1), is guided by a pin (9) extending the longitudinal recess (10) of the bottom (8), the end of the pin (9) protruding from the inertia ( 15) is provided with a ring (11) '? 2 drawings