SU1432293A1 - Safety friction clutch - Google Patents

Abstract

The invention relates to mechanical engineering, in particular, to devices for transmitting a limited amount of torque. Pel - higher accuracy of operation. When transmitting the torque, the disk 8 and the disk 3 connected to it by means of the pins 9 rotate relative to the coupling half 1. The balls 7 come into contact with the variable depth slots made on the disk 3 and fixed on the half coupling I of the stop disk 2. The resultant the spacer force on the balls is directed towards the force of the spring 4. The disk 3 moves to the right, reducing the pressure of the disk 8, thereby improving the accuracy of the clutch. The counter action of springs 11 and 4 increases the smooth operation of the clutch. On the rods 9 are installed adjustable stops 13. 2 3.p. f-ly, 2 ill.

Description

(Ls

15

The invention relates to mechanical engineering, in particular, to devices for limiting the magnitude of the transmitted torque.

The purpose of the invention is to improve the accuracy of the operation.

FIG. 1 shows the coupling scheme; in fig. 2 shows section A-A in FIG. one.

The safety friction clutch contains a leading coupling half 1 with a thrust 2 and a pressure 3 disks, spring-loaded one to another along the axis by a spring 4. A friction disk 6 is mounted on the driven half coupling 5. The balls are placed in variable depth slots made on the disks 2 and 3. On the intermediate 20 disk 8, rods 9 are rigidly fixed, located in the holes 10 of the pressure disk 3. On the rods 9, compression springs 11 are mounted, pressing the intermediate disk 8 to the friction 25 disk 6 The force of the spring 4 is adjusted by the nut 12. The force of the springs 4 exceeds the total force of the springs 11, and adjustable stops 13 are installed at the free ends of the rods 9.

The clutch works as follows.

When transmitting a torque, the disk 6, and with it the disk 3, rotates relative to the coupling half 5 in the corresponding direction, which occurs at a moment much smaller than the limiting one. The balls 7 come into contact with the disk 3 and the stop disk 2 (with their sockets of variable depth), as a result of which there is a pushing force on the balls 7, directed towards the spring force 4. As a result, the disk 3 moves to the right, additionally squeezing the spring 4, with This spring 11 is extended. This leads to a decrease in the pressing of the disk 8 and to an increase in the accuracy of the coupling operation. When slipping friction discs occur

thirty

35

40

disc 3, which is provided by maximizing the radius of the rods 9 relative to the axis of rotation of the coupling without increasing its radial dimensions. The strength of friction is defined as follows;

Tt

f,

10 where F,

gr

f tangential force between the rod 5 and the disk 6; coefficient of friction between them.

On the other hand

where is the torque transmitted by the clutch;

R is the radius of the location of the rods 5 relative to the axis of rotation of the coupling.

With increasing F, F and therefore friction loss decreases.

The geometrical dimensions of the coupling elements must satisfy the following relationship:

R

:R

Ri

(i-l) f.

 min

where is r,

wed

L

min

average radius of friction discs;

radius of the circle on which the rods are located; the number of pairs of friction friction disks; the lowest value of the coefficient of friction between the friction discs; the lowest value of the coefficient of friction between the intermediate disk and rods.

d5 Formula of invention

Claims (3)

1. A safety friction clutch, containing a drive with a thrust and pressure discs, sub-dynamic oscillations, the level of which is axially spring-loaded one to another, which are low in this clutch. This is a announced half coupling with axially movable axle. disc 3, which is provided by maximizing the radius of the location of the rod 9 relative to the axis of rotation of the coupling without increasing its radial dimensions. The strength of friction is defined as follows; Tt f, where f gr f tangential force between the rod 5 and the disk 6; coefficient of friction between them. On the other hand where is the torque transmitted by the clutch; R is the radius of the location of the rods 5 relative to the axis of rotation of the coupling. With increasing F, F and therefore friction loss decreases. The geometrical dimensions of the coupling elements must satisfy the following relationship: R :R Ri (i-l) f.  min where is r, wed L min average radius of friction discs; radius of the circle on which the rods are located; the number of pairs of friction friction disks; the lowest value of the coefficient of friction between the friction discs; the lowest value of the coefficient of friction between the intermediate disk and rods. d5 Formula of invention This is eliminated by the counter action of the springs 11 and 4, as a result of which the springs 11 are a damper of longitudinal vibrations of the disks 3 and 8. This feature makes it possible to increase the smoothness of the coupling operation. The accuracy of operation is increased by reducing friction in the articulation of the rods 9 s The friction disk located between the disks of the leading half-coupling and the stabilizing device associated with them is a pressing device, characterized in that it is equipped with an intermediate disk rigidly fixed on it (which is fixed to it). identical in the OTBepCTv.Hx performed on the pressure plate with the possibility of axial movement, and compression springs located on the rods between the pressure and intermediate disks. 2. A coupling according to claim 1, characterized in that the average radius of the friction disks is determined by the ratio R. R CF, i-owf "AND, Where P is the average radius of the friction discs; ( one min radius of the circle on which the rods are located; the number of pairs of friction friction disks; -the smallest value of the coefficient of friction friction disks; -the lowest value of stock friction coefficient. 3. Coupling on PP. 1 and 2, in that it is equipped with stops that are installed on the free ends of the rods. TIN fig.g