SU1278524A1 - Expanding clutch - Google Patents

Abstract

The invention relates to the field of engineering, and more specifically to devices for transmitting rotation. The aim of the invention is to increase the load capacity of the coupling. The centrifugal clutch contains a leading 1 and a driven 2 half coupling connected by friction disks 3. On the leading coupling half 1, a spring-loaded pressure disk 10, a separator 6 with balls and a stop disk 12 are installed. The balls 8 are placed in the separator windows and contact with the radial guides on the pressure disk 10 and with a stop disc 12. During acceleration of the leading coupling half 1, the balls move under the action of centrifugal force along the radial guides from the axis of the coupling. I will influence the bevels of the separator windows, the balls turn it, at the same time I will act on the tapered surface of the pressure disc 10, moving it in the axial direction and ensuring compression of the friction discs. The increase in the load capacity of the coupling is ensured by increasing the force of compression of the discs by acting on the pressure disc directly and additionally through a pair of separator threads. 2 Il. (L

Description

N3

CX)

ate yu

four

The invention relates to mechanical engineering, namely to devices for transmitting rotation.

The whole invention is to increase the load capacity, accuracy of operation and reduce the axial dimensions of the coupling.

FIG. 1 shows a centrifugal clutch, longitudinal section; in fig. 2 shows section A-A in FIG. one.

The centrifugal clutch consists of a Vedush, her 1 and the slave 2 coupling halves connected by a package of 3 friction discs. On the leading coupling half, by means of a key 4, a threaded sleeve 5 is mounted onto which the separator 6 is screwed by means of a non-braking w, a left-hand thread separator 6, which has windows for balls made with bevels 7. Balls 8 are placed in the separator 6 between the bevelings of the windows of the latter and radial guides 9 mounted on the pressure disc 10. The latter is mounted axially on the half coupling 1 in the axial direction and spring-loaded in the direction by the spring 11. The axial displacement of the balls to the right is limited to the right by means of the stop disc 12, y mounted on the adjusting sleeve 13. The axial movement of the sleeve 13 is carried out with the help of nuts 14, and the thrust disk 12 - with the help of nuts 15. The guides 9 are fixed on the pressure disk 10 with the help of shafts 16. The separator 6 is spring-loaded relative to the pressure disk 10 in the circumferential direction by springs 17 stretch. The gaps between the friction discs of package 3 and 4 are not shown in the non-rotating clutch.

The centrifugal clutch operates as follows.

In a non-rotating coupling, the balls 8 are axially pressed against the thrust disk 12 by the spring 1 through the pressure disk 10, in the circumferential direction by means of the springs 17 by means of a separator b to the radial guides 9. The axial position of the threaded sleeve 5 is adjusted by nuts 14 through the sleeve 13 so that there is no an axial clearance between the pressure disc 10 and the threaded sleeve 5. The nuts 15 regulate the axial position of the thrust disc 12 so that there is no axial clearance between the balls 8 and the thrust and pressure discs.

In the process of acceleration of the leading coupling half 1, the balls 8 under the action of centrifugal force move along the radial guides 9 from the axis of rotation of the coupling and, acting on the bevels 7 of the windows of the separator 6, rotate the latter in a counterclockwise direction by an angle. At the same time, the balls, acting on the tapered surface of the pressure disk 10, move it to the left, thereby compressing the package of 3 friction disks and transferring torque to the driven coupling half 2. Thus, three forces act on the pressure disk: from the balls 8 side centrifugal force from the side of the separator 6 under the action of balls on the bevels 7 of the windows of the separator and the threaded connection between the sleeve 5 and the separator 6 and from the side of the spring 11.

In this case, the axial force of compression of the package of the friction disks is

2SGnV (/,.

tg (a-p) -Efi

PI g900

-tcftg-C -p)

(Y-p)

-F,

tnp .2 g900

where G is the weight of the ball;

g- acceleration of the force of gravity; r is the radius of the center of the ball tin; n is the frequency of rotation of the coupling half 1; d is the average diameter of the thread between the separator 6 and the threaded sleeve 5; a is the bevel angle of the windows for balls in the separator;

P - the angle of elevation of the thread; 7 - the angle between the generatrix of the conical surface of the pressure disc 10 and the axis of rotation of the coupling; p is the friction angle; fnp i-force spring 17; Fiip.2 is the force of the spring 11. The axial force of compression of the friction discs increases by the magnitude of the second term. Accordingly, the torque transmitted by the clutch is greater.

To ensure that the clutch transmits the maximum torque, it is necessary that the values of the corresponding angles satisfy the following relation:

to J g tgcx R

where p is the thread pitch;

L is the number of threads; R

Claims (1)

the distance from the axis of rotation of the coupling to the point of contact of the ball with the bevel of the face cage of the separator for the position of the ball at the nominal frequency of rotation of the coupling. Due to the fact that the radial guides 9 are fixed on the pressure disk 10, when the clutch operates, the latter experiences tangential forces from the side of the balls 8. In the case of rotation of the clutch in the counterclockwise direction (Fig. 2), the circumferential force from the transmitted torque to key 4 on the side of the pressure disc 10, it is partially balanced by tangential forces, which reduces friction in the keyed joint and also contributes to an increase in the axial compressive strength of the package of the friction disks and to an increase in the accuracy of limiting the transmitted of torque. The use of the invention improves the load capacity of the coupling, reduces the axial dimensions and improves the accuracy of operation. Claims of the invention: A centrifugal clutch containing drive and driven coupling halves connected by friction discs and a pressure centrifugal mechanism in the form of a pressure disc and separator mounted on the drive half coupling with a ball in contact with a pressure disc, characterized in that, in order to increase the load capacity, it is equipped with a stop disk mounted on the leading coupling half, the separator is installed by means of a non-braking thread and is spring-loaded relative to the pressure disk; the separator windows are made with bevels, directed to the axis of the coupling, the pressure disk is made with radial guides and is spring-loaded to the friction disks, and the balls are placed between the guides of the pressure disk, the bevels of the separator windows and the stop disk.