SU1183747A1 - Safety friction clutch - Google Patents

Abstract

SAFETY FRICTION COUPLING, containing disk drive and driven coupling halves, a pressure disk and a squeezing device having an adjustable spring and mounted with the possibility of interacting in it a threaded sleeve with concentrically arranged and counter-directed non-braking threads, one of which is articulated with the thread of the pressure disk, a articulated with a threaded coupling half, characterized in that, in order to expand the operational capabilities by providing adjustment of the coupling to different There are torsional moments when operating in reversing mode, it is equipped with additional adjustable springs installed between the pressure disk and the driving half coupling, while the main and additional springs are set tangentially with the possibility of interaction with the parts connected with them in mutually opposite circumferential directions .

Description

This invention relates to mechanical engineering, in particular to safety friction clutches. The purpose of the invention is to enhance operational capabilities by allowing the clutch to be adjusted to varying maximum torque levels when operating in reverse mode. FIG. 1 shows a safety friction clutch, a general view of a longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 1. The safety friction clutch contains a disk drive 1 and the driven 2 coupling halves, having a splined connection, respectively, with the leading 3 and driven 4 friction disks. On the coupling half T, on the key 5 there is a disk 6 and a sleeve 7 with a thread 8 of the left direction. A sleeve 9 is screwed onto the sleeve 7 until it stops. A sleeve 9 is installed on the right-hand thread 10 of the pressure disk 11. The disk 6 and the sleeve 7 are pressed to the coupling half flange 1 by nuts 13, screwed onto the threaded end of the coupling half through the sleeve 12. The flange of the sleeve 9 is fixed to the fingers 14, the supporting segments 15, attached to the fingers 14 with a gap (not shown). Between the segments 15 and the disk 6 are installed tangentially adjustable additional springs 16 of compression, the adjustment of which is made by screws 17. On the pressure disk 11 there are fixed (fastening not shown) fingers 18, supporting segments 19, fitted on fingers 18 with a backlash (not shown) . The tangentially main adjustable compression springs 20 are installed between the segments 19 and the disk 6. The forces are adjusted using screws 17 ". In the flange of the threaded sleeve 9 there are slots 21 for the support legs 22 of the disk 6. Between the flange of the threaded sleeve 9 and the end of the pressure disk 11 facing it the gap 23. Between the flange of the threaded sleeve 9 and the end face of the disk 6 facing towards it there is also a gap 24. The axial position of the parts 6,7,9 and 11 during the initial assembly and also when compensating for wear of the disks 3 and 4 is determined by matching the length of the sleeve and 12. In order to ensure a certain mutual angular position of the key groove of the sleeve 7 and the slots 21 of the flange of the threaded sleeve 9, the processing of the sleeves 7 and 9 is performed as an assembly. The safety friction clutch operates as follows. The pressure disk 11, held from longitudinal movement at nominal torques on the one hand by the elastic forces of the springs 16 and 20, and on the other hand by the forces of elastic deformation of the compressed and interacting friction disks 3 and 4, ensures the transmission of the nominal torque. When the nominal torque is exceeded on the driven half coupling (clockwise rotation - right side view, figure 1), the pressure disk 11, turning counterclockwise on the threaded sleeve 9, moves to the right (figure 1), compressing the spring 20, Here, the compression force of the friction disks 3 and 4 is reduced. When the nominal torque is exceeded on the driven half coupling (when turning counterclockwise, right-side view, FIG. 1), the pressure disk 11, turning clockwise together in the threaded sleeve 9, moves to the right along the thread of the left direction on the sleeve 7. 16 is compressed, and the pressure disk 11, moving under the action of springs 20, moves along the thread of the threaded sleeve 9 to the left, preventing the latter from returning to its original position, while the compressive force of the friction disks 3 and 4 decreases. The magnitudes of the nominal torques are determined by the formulas when rotated counterclockwise (right view, Fig. 1) v h d / to. (ft + p) when rotated clockwise (right view, FIG. 1) .1 J P 21. d tg, where z is the number of pairs of friction surfaces; f is the coefficient of friction between the friction discs 3 and 4; Pfip is the operating force of the spring 20; Pfipi spring force 16;

- the diameter on which the spring 20;

- the diameter on which the spring 16;

- the average diameter of the working part of the disks 3 and 4;

- the average diameter of the thread of the pressure disc 11;

- average thread diameter of the sleeve. 7;

FIG.

- angle of elevation of the thread

disk 11; - angle of elevation of the thread

bushings 7;

- the friction angle in the thread of the disk 11;

- the friction angle in the thread of the sleeve 7;

- the number of springs 20; - the number of springs 16.

FIG. g

Claims (1)

ONE COUPLING, containing disk master and driven half-couplings, a pressure disk and a squeezing device having an adjustable spring and a threaded sleeve with concentrically located and counter-directed non-self-locking threads, one of which is articulated with a pressure disk thread, and the other is articulated with thread of the driving coupling half, characterized in that, in order to expand operational capabilities by ensuring the regulation of the coupling to various maximum torque When operating in reverse mode, it is equipped with additional adjustable springs installed between the pressure plate and the drive coupling half, while the main and additional springs are installed tangentially with the ability to interact with related parts in mutually opposite circumferential directions.