SU1587246A1 - Safety slip coupling - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to devices for transmitting torques of limited magnitude. The purpose of the invention is to provide a high stability of torque transmission due to a unidirectional change in the total force of the preload of the disks, depending on wear. The clutch contains coupling halves 1 and 2, interconnected by a package of friction disks (PD) 3 and 4, arranged between axially movable thrust 5 and pressure 7 disks. The unequal shoulder lever 11 with the rollers 12 at the ends is hinged on the coupling half 1 and communicates with the ends of the disks 5 and 7. The power closure of the PD package 3 and 4 is carried out using a spring 9. The pressure disk 7 acts on the lever 11, thereby turning it counterclockwise arrows and moving the thrust disk 5 to the right. When the PD 3 and 4 are worn, the pressure disk 7, moving it up under the action of the spring 9, rotates the lever 11 anticlockwise. The lever 11, acting on the thrust disk 5, moves it towards the pressure disk 7, compressing the package PD 3 and 4. Due to the unequal length of the arms of the lever 11, the movement of the pressure disk 7 is less than the total wear of the PD 3 and 4. 1 Il.

Description

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

The purpose of the invention is to provide a high stability of torque transmission due to a unidirectional change in the total force of the preload of the disks, depending on wear.

The drawing shows a schematic diagram of a safety friction clutch.

The safety friction clutch contains the coupling halves 1 and 2, interconnected by means of the friction disks 3 and 4. The disks 3 are mounted on the stop disk 5 with the possibility of axial movement. The thrust disk 5, in turn, can move in the axial direction relative to the half coupling 1 in the directional key 6. The disks 4 can move in the axial direction relative to the coupling half 2. The connection between the disks 3 and 4 with the corresponding coupling elements can be carried out, for example, by means of a movable spline joint. The pressure disk 7 is movably mounted in the axial direction relative to the half-coupling 1 and is connected by means of the guide pin 8 to the hub of the stop disk 5, therefore, it has the possibility of axial movement and relative to the latter.

Compressing the package of the friction discs 3 and 4 is carried out by a spring 9, the force of which can be adjusted by means of the adjusting element 10. the smaller arm of the lever 11 rests on the end of the pressure disk 7, the roller attached to the end of the larger arm of the lever rests on the end of the stop disk 5. The lever 11 can be rotated

in both directions in the plane of the drawing. In the coupling half 1 is made a groove through which the lever 11 is passed.

The clutch works as follows

The pressure disk 7, moving to the left (according to the drawing, under the action of the spring 9 acts on the roller 12 of the smaller arm of the lever 11, which, turning counter-clockwise, with its

large shoulder moves to the right (according to the drawing) stubborn disk 5, i.e. towards the pressure disk 7. At the same time, the clamping of the disk-3 disks 3 and 4 between the stop and pressure disks occurs. As a result, on disks 3 and 4: the force of friction is excited, which ensures the transfer of torque between coupling half 1 and 2 o. The master can be any coupling half.

If the half-coupling is leading, the torque from it is transmitted to the supporting disk 5 via key 6 and then through the package of friction disks 3 and 4 to the coupling half 2. If the driving coupling is coupling coupling 2, the transmission of torque takes place in the opposite direction dke. The pressure disk 7 receives the torque from the stop disk 5 via key 8 and also participates in the transmission of torque to the coupling half 2.

When the friction discs 3 and 4 are worn, the pressure plate 7 is moved to the left by the action of the spring 9. At the same time, the lever 11, under the action of the pressure disk 7, rotates counterclockwise, and the larger lever arm, with its roller 12, acts on the support disk 5, moves it towards the pressure disk 7, Toe. to the right. Since the lengths of the arms of the lever are not equal to each other, the movements of the thrust and pressure discs will also be unequal. The thrust disk 5 will receive a larger drop compared with the nazkim disk 7, where the sum of the movements of the disks 5 and 7 is equal to the total wear of the friction disks 3 and the axial movements of the disks 5 and 7 will be proportional to the lengths of the respective arms of the lever 11.

If h is the total wear of the friction discs 3 and 4, h, and hj are the axial displacements of the pressure 7 and thrust 5 discs, then the following equality

(I)

h, + h h ,.

since the magnitudes of the axial movements of the disks 5 and 7 are proportional to the lengths of the respective arms of the lever 11, we can write

hj b

(2)

where 1 and 1 are the lengths of the smaller and larger arms of the lever, respectively. Hence it follows

h ill

 -t; - (3)

Substituting the last result in (1) receive,

. -hia 1 h

(four)

Analyzing (4), it can be seen that the displacement of the pressure disk 7 when the friction discs 3 and 4 are worn out is less than the total wear value of the latter. Consequently, the wear of the friction discs has less effect on the change in the force of the spring 9, which means less fluctuations in the torque transmitted by the clutch. At h 4 mm, h 20 mm, h 100 mm and spring stiffness 3 kg / mm, the spring force changes as a result of the wear of the friction discs are obtained.

Jt 3 x

 2 kg

 20

 pr - - 20 tTo about

Accordingly, the reduction in torque at the coupling is less, which means that the stability of Bbmje.

From (4) it follows that the greater the difference in the lengths of the shoulders of the CShr, the.

587246 - 6

less than the value of b and, therefore, higher stability of the torsional moment-

five

The use of the invention will improve the stability of the transmitted torque when the friction discs are worn.

ten

Claims (1)

Invention Formula A safety friction clutch, containing two concentric half-couplings connected by a package of friction disks, a thrust disk and a pressure disk spring-loaded with respect to the adjusting means, is a stabilizing device of the transmitted moment, which is different in that it is designed to increase stability. transmitted moment due to unidirectional change of the total effort to tighten the discs depending on wear in the direction of the pressure plate 0