SU1742547A1 - Slipping clutch - Google Patents

Abstract

Usage: limiting the transmitted torque. SUMMARY OF THE INVENTION: The half-couplings are connected by a friction disk, clamped by a spring between the stop and pressure disks. The squeezing unit contains balls placed in the sockets of variable depth between the stop disk and the squeeze sleeve spring-loaded relative to the pressure disk. The balls of the pressure knot are placed in the sockets of the pressure sleeve and are supported on a stop sleeve having sockets with openings under it balls, through which they come into contact with the supporting disc. The latter is connected axially with the pressure disc. The pressure sleeve is located between the stop sleeve and the pressure plate and is spring-loaded with the specified spring relative to the latter. 2 Il.

Description

WITH

with

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

A known friction clutch has two half couplings connected by friction discs, a push-off unit, a stop sleeve connected in the circumferential direction to the stop disc, and pressure rolling bodies located in the sockets of the stop sleeve and in response sockets made to face the stop sleeve face surface of the pressure disc.

The clutch has a low durability due to intense wear of the friction surfaces of the disks when slipping.

Closest to the proposed technical essence and the achieved result is a safety friction clutch, which contains coaxial drive and driven coupling half, connected

a friction disk placed between a thrust and rigidly mounted with respect to its rotation and axial movement of the pressure disks fixed between the fixed half coupling, a pressure sleeve mounted axially relative to the leading half coupling half displaced relative to the pressure disk and mounted with the possibility of axial relative to it moving thrust bushings, pressure unit, including rolling pressure bodies, located in nests made with equal pitch dah pressure sleeves with the ability to interact with similarly located sockets resistant bushing, squeezing knot, including squeezing elements in the form of rolling bodies, placed in also variable circumferentially spacing nests of variable depth, made on the thrust disk and squeezing sleeve,

Xi

Ю Yu O1 N x |

the nests of the latter are displaced relative to (the distance of the stop bush by an amount equal to half the circumferential pitch of the placement of these nests.

The disadvantage of the clutch is low durability due to wear of the friction pairs in the process of their mutual slippage.

The purpose of the invention is to increase the durability of the coupling by reducing the wear of the friction pairs in the process of their mutual slip.

The goal is achieved by the fact that a safety friction clutch, containing coaxial drive and driven coupling halves, is connected by at least one friction disk placed between the thrust bearing rigidly fixed to the drive half coupling and installed with respect to its rotation and axial movement of the pressure disks, the pressure sleeve, mounted with the possibility of axial relative to the leading half-coupling of displacement, spring-loaded relative to the pressure disk and installed with the possibility of axial relative but it moves squeezing and thrust sleeves, pressure unit, including pressure rolling bodies located in nests of pressure sleeve made with equal pitch with the possibility of interaction with similarly located nests of thrust sleeve, squeezing unit including squeezing elements in the form of rolling bodies, placed in made also with equal circumferential pitch variable depth sockets made on the thrust disk and squeeze sleeve, while the nests of the latter are offset relative to the sockets of the thrust sleeve on the lead a rank equal to half the circumferential pitch of these sockets is provided with a supporting disk, which is connected in the axial direction with the pressure disk, the sockets of the thrust sleeve are made with openings with the possibility of interaction of the pressure rolling bodies with the support disk, the pressure sleeve is located between the pressure sleeve and the pressure disk , wherein the pressure rolling bodies are arranged with the following relationship:

R r -ctga tg /,

where R is the radius of the circle on which the pressure rolling bodies are located;

d is the radius of the circle on which the squeezing elements are located;

a, ft are the magnitudes of the angles, respectively, between the side surfaces of the nests of the squeezing and thrust bushings and the axial plane passing through the center of the corresponding squeezing element and the rolling pressure body.

FIG. 1 depicts a principal

scheme, safety friction clutch; in fig. 2 shows section A-A in FIG. one.

The safety friction clutch contains coaxial drive 1 and driven 2 coupling halves connected by a friction disk 3, which is located between the stop 4 fixed to the coupling half 1 and mounted rotatably and axially relative to the coupling half 1 by a pressure 4 disk. Last

5 is connected by means of a key 5 with a spring bushing 6 spring-loaded relative to the pressure disc. The spring b sleeve is able to rotate relative to the coupling half 1 and move relative to the latter and the pressure disc 4 in the axial direction.

The squeezing rolling bodies in the form of balls 8 are placed in the sockets of variable depth, made on the thrust disk and on the pressing sleeve b (Fig. 2). The squeeze sleeve 6, the spring 7 and the balls 8 form a squeeze unit.

Pressing the friction disc 3 against the thrust and pressure 4 discs is carried out

0 by means of a spring 9 located between the pressure disk 4 and the key 10 connected to the coupling half 1 pressure sleeve 11, which can be axially displaced relative to the half 5 of the coupling 1. In the axial cylindrical nests of the pressure sleeve 11 there are pressure rolling bodies in the form of balls 12 fixed from rolling out of the nests. The balls 12 are supported on the associated by means of the key 13 with the pressure disk 4 a thrust sleeve 14, which is rotatable with respect to the coupling half 1 and axial with respect to the pressure movement disk. In addition, the resistant sleeve 14

5 has the possibility of axial movement relative to the coupling half 1.

On the end surface of the pressure disc 4, the cover 15 is fixed, in which the adjusting screws 16 are screwed. Ends

0 screws 16 abut against the supporting disk 17, having the possibility of axial relative to the pressure disk 4 and the half-coupling 1 movement.

The thrust sleeve 14 rests on the adjusting element 18. On the thrust sleeve 14, sockets for balls 12 are made in the form of through-holes of conical shape. The thickness of the stop sleeve 14 in the area of the sockets and the axial clearance between the stop sleeve and the support disc 17 should be less than the axial gap. the gap between the pressure 11 and thrust 14 bushings. The sockets of the forcing sleeve 6 are offset relative to the sockets of the stop sleeve 14 by an amount equal to half the circumferential pitch of the latter.

The clutch works as follows.

The parameters of the squeezing device are chosen such that, when transmitting a torque not exceeding the nominal, rotation of the pressure disk 4 relative to the stop disk, do not cause specimens 12 to enter the sockets of the stop sleeve 14.

When overloaded, the pressure disk 4 rotates relative to the stop disk, which causes the release sleeve 6 to move to the right and the spring 7 to compress. As a result, the balls 12 fall into the sockets of the support sleeve 14 and rest on the support disk 17. As a result, the pressure disk 4 begins to perceive the spring force 9 on the right. Pressing the pressure disc 4 to the friction disc 3 becomes zero and the pressure disc under the influence of the spring 7 moves to the right until the balls 12 begin to abut against the slots of the stop sleeve 14 or the pressure sleeve 11 - into the stop sleeve 14, depending on the magnitude ratio axial clearances between these elements. The movement of the pressure disc 4 is stopped and it is under the influence of the torque generated by the squeezing unit, it tends to return to its original position, which is prevented by the torque generated by the pressure unit.

Thus, when the clutch is activated, the friction surfaces are disconnected, which reduces their wear and increases the durability of the clutch.

To keep the pressure plate 4 in position 3 at the position retracted from the friction disk

F Fg - Fi (1)

where F is the compressive force of the spring 7 dl - the specified position:

Fg is the same for spring 9;

FIT is the pressure force between the balls 12 and the supporting disk 17 for a specified period of time.

FIT is equal to

Fi7 Fg - Fo (2)

The magnitude of the force F0 is determined as follows.

,

where T is the torque acting on the pressure disk from the squeezing point;

R is the radius of the circle on which the balls 12 are located ;,

f is the angle between the lateral surface of the socket of the thrust bushing 14 and the axial plane passing through the center of the ball 12 But

T FT G Ctg a,. (4)

where g is the radius of the circle on which the balls 8 are located;

10a - the angle between the side surface

variable depth socket of the bushing sleeve 6 and the axial plane of the coupling passing through the center of the ball 8.

The solution of inequality (1) in view of (2), (3) 15 and (4) gives

R r-ctga-tg /. (5)

The resulting inequality reflects the condition of holding the pressure plate 4 in the off position, eliminating wear on the friction surfaces.

After the clutch stops, turning the pressure plate 4 in the appropriate direction will ensure that the clutch elements return to their original position. 25 In this case, the parameters of the coupling elements, in particular, the ratio of the forces of the springs 7 and 9, are chosen so that it would suffice to apply a small force (3-5 kg) to manually rotate the pressure plate, 30 also the values of R and g, not going beyond the conditions

(five).

Clutch adjustment is done by

35 axial movement of the stop sleeve 14 by means of an adjusting element 18. At the same time, the corresponding axial movement of the support disc 17 is carried out by means of adjusting

40 screws 16. The coupling can be made in a multi-plate version.

The use of the invention makes it possible to increase the durability of the coupling by reducing the wear of the friction surfaces.

Claims (1)

45 claims A safety friction clutch containing coaxial drive and driven coupling halves connected by at least one friction disk, spaced between the stop disk fixed to the drive coupling half and mounted with the possibility of rotation and axial displacement relative to it, pressure sleeve mounted 55 with the possibility of axial relative to the leading half-coupling movement, spring-loaded relative to the pressure disk and installed with the possibility of axial movement relative to it, squeezing and thrust bushings, pressure unit, including pressure rolling bodies located in pressure sleeve sockets made with equal pitch, with the possibility of interaction with similarly arranged thrust sleeve sockets, squeezing unit including rolling elements in the form of rolling bodies, placed in made also with equal the circumference of the pitch nests of variable depth, made on the thrust disk and squeeze sleeve, while the last nests are offset relative to the nests of the thrust sleeve by an amount equal to half a step of placing these nests, characterized - in that, in order to increase the durability by reducing wear friktsion--hole pairs in their mutual slippage, it is provided with a support the disk, which is connected in the axial direction with the pressure disk, the sockets of the thrust bushings are made with openings with the possibility of interaction between the pressure rolling bodies and the bearing disk, the pressure bushings are located between the pressure sleeves and the pressure disk, and the pressure rolling bodies are arranged taking into account the ratio R c gtga tg / ft, where R is the radius of the circle on which the pressure rolling bodies are located; d is the radius of the circle on which the squeezing elements are located; CE, / are the angles, respectively, between the side surfaces of the nests of the squeezing and thrust bushings and the axial plane passing through the center of the corresponding squeezing element and the rolling pressure body.