SU1581911A1 - Torque-limiting friction clutch - Google Patents

Abstract

The invention relates to mechanical engineering, in particular, to devices for transmitting a torque moment of limited magnitude. The purpose of the invention is to improve the response accuracy, reduce the size and mass of the coupling by providing variable response accuracy during tuning and improving the elastic-damping properties. The master 1 and the half coupling coupling are connected by a friction disk / D /. Push the D 4 is installed freely and preloaded by the spring. Balls 7 are placed between the stop and pressure D in the sockets of variable depth formed by V-shaped elastic elements 6. When the pressure D 4 is operated, it is displaced in the circumferential direction. On the balls 7, an expansion force arises, reducing the compressive force of the friction pairs. As the torque increases, the thrust force increases, which leads to an increase in the accuracy of the coupling. 2 Il.

Description

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The invention relates to mechanical engineering, in particular to devices for transmitting torques of limited magnitude.

The purpose of the invention is to improve the response accuracy, reduce the size and weight of the coupling by providing variable response accuracy during tuning and improving the elastic-damping properties.

FIG. 1 is a schematic diagram of a safety friction clutch; in fig. 2 shows section A-A in FIG. one.

The safety friction clutch contains two coaxial one-side coupling half: master 1 and driven 2, which are interconnected by means of a friction disk 3 connected to the coupling half 2 by means of a splined connection ensuring the mobility of the disk 3 in the axial direction. The pressure disk 4 is loosely mounted relative to the half coupling 1. A pressure disk fixed rigidly on the half coupling 1 and the pressure disk 4 are attached by rivets 5 pairwise elastic elements 6, made in the form of springs of V-shape in a plane parallel to the axial plane of the coupling. The elastic elements 6 are placed in the grooves of the thrust and pressure disks and can be made in the form of petal springs. In the nests of variable depth, formed by elastic elements 6, rolling bodies are placed in the form of balls 7. Elements 6 and 7 together with the pressure disk 4 form a squeeze stabilizing device.

The myrtle force closure is performed by means of a torque adjusting unit, which contains a compression spring 8, which transmits force to the pressure disk 4 through the thrust bearing 9. and the rotating element SO. for example the nut screwed on the threaded VMHCTOK coupling half 1.

To eliminate the possibility of rotation of the elastic elements 6 around its axis, the number of rivets 5 must be at least two for each element 6. The coupling method of the elements 6 to the respective discs may be different, for example, using spot welding

The proposed coupling works as follows.

When transmitting a torque, the pressure disk 4 is displaced under the action of a moment of resistance forces from the disk 3 in the circumferential direction relative to the coupling half 1, with the result that the balls 7 come into contact with the elastic elements 6 of the pressure and pressure disks and participate in the transmission of torque. The axial component of the force of the normal pressure on the balls 7 is directed towards the compression force of the springs; 8 and reduces the effect of the latter on the pressure disk 4 Parameters of elastic elements 6 (the width of the element, its thickness, material

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and others) are chosen so that when transmitting the nominal torque, the smallest of the working range of torques that

5 with the appropriate setting to transmit the coupling, the deformation of the elastic elements b, i.e. their bend was small.

The maximum torque that the clutch can transmit when it is set to the minimum load is determined by

0 formula

t np-flcp. // R r + Sbp-f-m

5 where Flip is the initial force of compression of the spring 8; # CP - the average radius of the friction friction disks;

f is the coefficient of friction; d is the radius of the circle on which the centers of the balls 7 are located; and - the angle between the plane of the petal of the elastic element 6 and the axial plane of the clutch, corresponding to the transfer GPR.

An increase in the moment of resistance forces 5 on the driven half coupling 2 in terms of an increase in the coefficient of friction between the friction discs leads to an increase in the force of the normal pressure between the balls 7 and the elastic elements 6, which leads to additional deformation of the latter and to an increase in the angle a. This, together with an increase in the thrust force on the balls 7, which is a consequence of an increase in torque, leads to an additional increase in the thrust force and, consequently, to an increase in the accuracy of the coupling operation. The latter is confirmed by an analysis of the above formula, in which the value of a is variable, depending on the value of the transmitted moment.

In the event that the coupling is set to a higher torque, carried out by tightening the spring 8, the force of the normal pressure that occurs on the balls 7 during operation also increases.

5 This leads to a greater deformation of the elastic elements 6 and, as a consequence, to an increase in the angle a. Therefore, in this case, a more intensive growth of the spacer force is observed on the balls 7, and therefore the accuracy of the coupling operation also increases.

This reduces the loads acting on the clutch at the time of limiting overload, and therefore reduces the safety margin of parts, which in turn has a favorable effect on the size and weight of the clutch. In the proposed coupling is maximum

5, the magnitude of this angle may be higher due to the fact that, in addition to the spring 8, the pressure disk 4 is returned to the initial position. This is also ensured by the action of the elastic forces of the elements b, therefore, the magnitude of the thrust force is achievable when transmitting maximum torques, and the accuracy of operation will be higher.

Claims (1)

Claims of the invention Friction clutch, containing the drive and clutch half couplings, connected by friction, push and stop discs, torque adjustment unit, squeezing stabilizing device consisting of rolling elements placed in slots fixed on the leading half coupling end the disk and the pressure disk, installed. Thanks to the installation of elastic elements 6 the coupling has elastic-damping properties that help reduce the level of torsional vibrations in the operating time and reduce the possibility of 1 nom free, characterized in that, with the onset of resonant effects during periods, the aim is to increase the accuracy of operation, start and stop the drive, reduce the dimensions and mass of the coupling and improving the elastic-damping properties The coupling may have a large number; it is provided with elastic elements, vypolfriktsionnyh pairs.15 nmenny in the form of petal springs K-shaped in a plane parallel to the axial plane of the coupling fixed between the ball and the bottom of each socket on the disks with a gap between the edge of the elastic petal and the side face of the socket. The present invention improves the accuracy of operation, reduces the size and mass of the coupling, and also improves the elastic-damping properties. 1 g Claims of the invention Friction clutch, containing the drive and clutch half couplings, connected by friction, push and stop discs, torque adjustment unit, squeezing stabilizing device consisting of rolling elements placed in slots fixed on the leading half coupling end disk and pressure disk, installed .. „,, free, characterized in that, in order to increase the accuracy of operation, reduce the size and mass of the coupling and FIG. one