SU1439313A1 - Safety clutch - Google Patents

Abstract

The invention relates to mechanical engineering and m. used in devices for transmitting rotation. The goal is to expand the functional capabilities of the coupling. The clutch contains coupling halves (П) 1 and 2. At the end of П 2, there are 7 sockets in which spring-loaded inserts 9 are placed. On the surface of the inserts 9 there are balls 11, which are in contact with curvilinear notches 12 P 1. On the end surface of the P 2, the shaped grooves located along the circumference, coupled with the sockets, are made. The bottom of each slot is at the level of the flat surface of the insert 9. The length of the shaped slot is greater than the diameter of the socket by an amount at least equal to the diameter of the ball. When P 1 is rotated clockwise, the clutch operates as a normal safety clutch. When rotating P 1 counterclockwise, the balls 11 are shifted from insert 9 to the bottom of the figure-S groove. When the moment is exceeded, the balls 11 cannot get out of engagement with the notches 12 and the clutch works as rigid. 3 il. (L with

Description

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The invention relates to mechanical engineering, in particular, to devices for torque transmission.

The purpose of the invention is to enhance the functionality of the coupling by ensuring its operation of both the safety and rigid coupling. Figure 1 shows a safety clutch, the general view of figure 2 is section A-A in figure 1; on fig.Z - section bb in figure 2,

The safety clutch contains two coupling halves 1 and 2. Half coupling 1 encloses coupling half 2. A bronze gasket 3 is installed on the face of the coupling half 2 and 1. At the end of coupling half 2 circumferentially shaped grooves 5 are made, limited by semi-circles with a radius corresponding to a radius balls. The bottom 6 of the grooves 5 is communicated with axial nests 7, the axis of which coincides with the axis 8 of one of the groove semi-circles, Dia- | Meter of the socket 7 exceeds the width of the groove 5, and hence the diameter of the semi-circles, i.e. the radius of the socket is greater than the radius of the semicircles of the groove. In the axial sockets 7 inserts 9 are placed, resting on the spring 10.

On the working surface of the inserts 9, balls 11 are in contact with the profile, for example, curvilinear notches 12 of the half coupling 1. The inserts 9 with their peripheral surface of the end face are pressed to the protrusions 13s formed by the difference in the diameter of the socket 7 and the dimensions of the groove 5 and locking. V inserts 9 at the bottom 6 of the groove 5. Outside of the socket 7, the length of 1 of the groove 5 is greater than the radius of the ball 11, i.e. the length of the arc of the bottom of the groove between the wall of the socket and the wall of the groove is greater than the radius of the ball. To reduce the wear of the interacting elements of the coupling half couplings 1 and 2 are provided with channels 14 and 15 for lubrication

Safety clutch works as follows.

When rotating half coupling 1 in one direction, for example clockwise, it forces rotating also coupling half 2 by pressing the spring 10 of the balls 11 of coupling half 2 to the curved grooves 12 half half of the coupling 1. When the resistance in half coupling 2 exceeds the calculated value of the transmitted torque, the balls 11 get out of the engagement with the curved grooves 12 of the half-coupling 11 and through the insert 9

compress the spring 10. Half coupling 1 begins to rotate relative to coupling half 2. The coupling works as a safety.

When the coupling half is rotated in the other direction, for example counterclockwise, the balls 11 roll from the flat working surface of the insert 9 to the bottom 6 of the groove 5. Now the balls 11 rest on the rigid surface of the bottom 6 of the groove 5 and with increasing resistance moment the balls 11 cannot exit meshing with curved grooves 12 of the coupling half 1. In this case, the coupling works as rigid.

If the length 1 of the arc of the groove 5, located between the edge of the socket 7 and the back of the groove 5, is less than the radius of the ball 11, the clutch works as a safety device when rotating in any direction, as with increasing resistance the ball 11 may roll onto the insert 9, compress the spring 10 and coupling half begins to rotate relative to coupling half 2.

The application of the proposed coupling allows it to be used when the drive shaft rotates in one direction as a safety, and when rotated to another suboron, as a rigid coupling, which makes it possible to use it in clamping devices, in which it is necessary to limit the amount of torque when tightening ( clamping) of any part and to have a greater moment value when decompression (unfixing) of this part.

Claims (1)

Invention Formula Safety coupling containing coaxially placed two coupling halves, the first of which has axial sockets with spring-loaded inserts installed in them and balls located in the sockets of one coupling half and interacting with the profile of the push-off grooves made at the end of the second coupling half, so that in order to expand the functionality of the coupling, on the end surface of the first half coupling, around the circumference of the axes of the axial nests, are shaped with these sockets figured grooves limited to VUM semicircles, the center of one of which coincides with the center of the nest, the radius of the semicircles corresponds to the radius of the balls, the radius of the nests is greater than the radius of the semi14393134 arms, and the length of the arc bottom of the socket and the edge of the wall is greater than the radius of the ball. -