SU1574942A1 - Safety friction clutch - Google Patents

Abstract

The invention relates to mechanical engineering, in particular, to devices for transmitting a torque of a limited amount. The purpose of the invention is to increase reliability by reducing the effect of wear on friction pairs. The coaxial coupling halves 1 and 2 are interconnected by a friction disk 3. The pressure disk 4 carries magnetic inserts 10, which are installed with alternating opposite poles. Similar inserts 9 are located on the coupling half 2 and facing the inserts 10 opposite poles. The inserts are angled to the longitudinal axis of the coupling. When working on balls 5, a thrust force occurs, reducing the compression of the friction pairs. Part of the torque is transmitted through the interaction of the magnetic fields of the inserts, whereby the force of the springs has a smaller effect on the change in the magnitude of the transmitted moment. 3 il.

Description

Fig, 1

The invention relates to mechanical engineering, in particular, to devices for transmitting a torque of a limited amount.

The purpose of the invention is to increase reliability by reducing the effect of wear on the performance of the coupling.

FIG. 1. shows a schematic diagram of a safety friction clutch; in FIG. 2 - section aa

in FIG. one ; in FIG. 3 - section BB on

figure 1.

Safety friction

the clutch contains a master 1 and a slave 15 2 coupling halves mounted coaxially one another and interconnected

friction disk 3. The pressure disk 4 is set loose relative to the coupling half 1. In the nests of variable depth 20, made on face surfaces facing one another

the thrust disk of the half coupling 1 and the pressure disk 4, the rolling bodies are arranged in the form of balls 5. The axial pressing of 25 friction pairs is carried out by means of a spring 6. To reduce friction between the spring 6 and the pressure disk 4, a thrust bearing 7 is installed. the springs are made by the adjustment element 8.

On the coupling half 2 fixed inserts

9 in the form of permanent magnets, on the pressure disk 4, concentric to the inserts 3, are similar inserts 10. Inserts 9 and 10 are installed with alternating opposite poles and are located at an angle to the axial plane of the coupling (BGG. 3). Inserts 9 and 10 are located one against the other (Fig). The number of inserts 9 is equal to the number of inserts 10. The number of inserts 9 and

10 is even so that it is possible to install inserts 9 and 10 with opposite poles one against the other. The choice of the angle of the inserts, the length of the arc on which these inserts are placed, has an on-Q defined value. These parameters are determined by design when designing the coupling. The magnitude of the axial component of the forces of the magnetic interaction, which manifests its effect upon the angular displacement of the coupling halves, depends on these parameters, since this axial component can cause an effect on the additional pressing

40

55

five

0

50

Q

0

five

or squeezing the pressure plate when the clutch operates.

The clutch works as follows.

In the initial period of operation of the coupling half coupling 2 with the friction disk 3 under the action of the moment of resistance forces are at rest. Together with them, it remains stationary and having a friction contact with the disk 3 of the pressure disk 4. The magnetic interaction forces of the opposite poles of the inserts 9 and 10 also contribute to this. The pressure disk 4 and the coupling half 2 remain stationary. As long as the balls 5 do not come into contact with variable depth slots that occur as a result of the sliding disc of the half coupling 1 relative to the driven friction disk 3. After the balls 5 come into operation, they transfer part of the torque. The magnitude of the moment transmitted by the balls 5 depends on the number of pairs of friction surfaces and on the magnitude of the moment that can be transmitted due to the magnetic fields of the inserts 9 and 10.

As a result of the interaction of the balls 5 with the sockets of variable depth, a spreading force arises on the balls, directed towards the force of the spring 6. As a result, the force of pressing the Friction ps to each other decreases.

As the transmitted moment increases, the thrust force on the balls 5 also increases, which leads to a decrease in the moment of frictional forces between the friction pairs. The coupling action occurs when the increasing moment of resistance forces on the coupling half 2 becomes equal to the decreasing moment of friction force of the friction assembly. In the design of this coupling, the transfer of torque is carried out both by the magnetic interaction forces of the inserts on the coupling half 2 and the disk 4, and due to the friction forces between the disks of the coupling half.

Due to the fact that magnetic inserts 9 and 10 are involved in the transmission of torque between coupling halves I and 2, the effect of the force of the spring 6 can be significantly reduced, and this, in turn, helps to reduce the effect of wear on the clutch friction elements on its performance . In addition, when

By fulfilling certain constructive relationships between the coupling parameters, the accuracy of the coupling operation can be improved.

At the end of the coupling operation, the skidding of the friction pairs is stopped, and the inserts 9 and 10 are installed one against the other with opposite poles as before the coupling is activated. This is ensured by the fact that, at the time point corresponding to the end of slipping, inserts 9 and 10 are located opposite one another with the same poles or with partial overlapping of the same and opposite poles, the moment transmitted by the magnetic interaction forces is less than nominal. The latter leads to additional slippage of the Friction pairs within the angle of rotation, providing the necessary orientation of the inserts 9 and 10.

A clutch may have a larger number of pairs of working surfaces. Installing inserts 9 and 10 at an angle to the axial plane of the coupling contributes to the smoothness of the magnetic coupling.

Formula

and

6

3 o

bratis

0

five

five

A safety friction clutch containing coaxial drive and driven coupling halves, interacting through a friction disk placed between the stop and spring-loaded pressure disks of the driving coupling half, the spring force control unit of the pressure disk and the squeezing device, including rolling bodies, placed in variable depth holes made on resistant and pressure discs, in order to improve reliability by reducing the effect of wear on the performance of the coupling, it is equipped with one Permanent magnets placed at the driven half coupling and pressure disk are installed at an angle to the longitudinal axis of the coupling and with alternating poles, with the driven half insert and pressure disk facing each other with opposite poles.

dd

FIG. 2

6-6

W

Fig.Z

Claims (1)

Claim A safety friction clutch 5 containing coaxial master and driven half couplings interacting with a friction disc located between the thrust and spring-loaded pressure disks of the drive half of the clutch, a pressure control unit for the pressure of the spring of the pressure disc and the squeezing device, including rolling elements located in dimples of variable depth, made on thrust and push 15 nd disks, characterized in that, in order to increase reliability by reducing the impact of wear on the performance of the coupling, it is equipped with the same vym number 20 concentrically placed 'on the driven coupling half and the pressure plate inserts of permanent magnets mounted at an angle to the longitudinal axis of the clutch and with alternating poles, and insert the driven coupling half 25 and the pressure plate facing each other with opposite poles. Fig.Z