SU1401184A1 - Automatic braking clutch - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in drives of mechanisms and machines in which accelerated stopping of rotating parts is required. Pel - increase of the W 26 20 21 reliability of work by providing a fixed removal of the brake pads from the body at twisted revolutions of the driven half coupling. For this, the clutch-brake contains two shoulders levers 14 with weights 15 and cams 16. The latter are located in the depressions 17 of the rods 6. When the rotation is transmitted from the driving coupling half 1 to the driven coupling half 8, the connecting rods 3 retract the shoes 7 from the body 24. At rotating speed of the driven coupling 8, the inertial loads 15 through the levers 14 and the cams 16 hold the pads 7 e to the retracted position. Between the pads 7, the strip 25 forms a gap that prevents braking of the driven coupling half 8. 4 Il. i (L 1.5 2S6l7f6 7 oo 4

Description

The invention relates to mechanical engineering and can be used in drives of various mechanisms and machines in which accelerated stopping of rotating parts is required.

The purpose of the invention is to increase the reliability of operation by providing a fixed removal of brake pads from the body at rotational speeds of the driven half coupling

FIG. 1 shows the coupling, cross section; in fig. 2 shows section A-A in FIG. 1, in FIG. 3 shows a section BB in FIG. 1J in FIG. 4 is a coupling-brake loading circuit.

The automatic clutch-brake consists of a leading coupling half 1, which interacts with the coupling half 2 of the engine and is connected by connecting rods 3, fingers 4 and 5. with brushes 6 of the brake shoes 7 moving in the bores of the driven coupling half 8. The brake shoe 7 is attached with the axis 9 hooded Yu with a brake spring 11 mounted on it, providing

pressure on the protrusion 12 of the opposite brake shoe 7. On the front part of the driven half-coupling 8 there is an opening for the axis 13, on which a double-arm lever is hinged

14, carrying a load on the extended shoulder

15, and on the opposite, shortened - cam 16 at least

with one protrusion engaging with a depression 17 of the stem b of the brake shoe 7. The cam 16 may be made as a partial or full gear, and the depression 17 as a gear rack.

For cases of clutch-brake use only, a brake release mechanism 18 consisting of a lever 19, a holder 20, pins 21, handles (not shown) and keypieces 22 with an axis 23 are provided as coupling connectors. All moving parts are housed in a fixed case 24 with lining 25. Driven half coupling 8 mounted on the input shaft 26 of the gearbox, and the leading - on the shaft 27 of the engine.

FIG. 1-3 shows the clutch in a static state (no rotation) j in FIG. 4 in the dynamic (presence of rotation), while in the first case the gap C is provided between the stem of the rod 6 and the end of the bore for the rod 6 in the driven coupling 8, and in the second between the pad 25 of the fixed housing 24 and the outer surface of the brake pads 7.

Automatic clutch-brake works as follows.

The driving half coupling 1 is driven by the motor rotation of the shaft 27 and, turning at a predetermined angle, for example 45 (Fig. 2), draws brake pads 7 using rods 3 into the bores of the driven coupling half 8 up to the stop of the shafts of the shaft 6 to the driven half coupling 8. In this case, the pads 7 move away from the lining 25, a gap C is formed between the Outer surface of the brake pads 7 and the lining 25 of the fixed housing 24 and the rotational transmission from the motor shaft 27 to the input shaft 26 of the gearbox occurs without loss. So the clutch works up to the critical speed. When it is achieved, the coupling provides for fixing the position of the brake pads 7 after they are pulled into the inside of the driven coupling half 8 by means of weights 15 placed on the elongated arm of the levers 14 pivotally fixed by the axles 13 on the driven coupling half 8 and acting by the cams 16 on the shortened shoulder, on stocks 6 brake shoes 7.

The principle of operation of the device for fixing the position of the brake pads 7 after they are pulled into the bores of the driven coupling half 8 and the force distribution scheme are shown in FIG. four.

The mass of the load 15, necessary for fixing the position of the brake pads 7 after they are pulled in, is approximately determined by the following equation:

ha to

. /.) b - г „v.h

V -b g

where a is the shortened shoulder of the lever 14, m;

b - lengthened lever arm 14, Mi

v is the velocity of the center of mass of the pad 7, m / s;

t - mass pads 7, KFJ

Vj. - speed of rotation of the center of mass of the load 15, M / CJ

q is the acceleration of the force of gravity, m / s1;

ts - the radius of the center t of the load, M-,

g - the radius of rotation of the center of mass of the pads 7, m;

 cargo weight 15, kg

Equation (1) with an accuracy sufficient for practical application allows one to calculate the mass of the load 15 for rotational frequencies used in the domestic industry.

As soon as the leading torque to the coupling half 1 is stopped, the brake springs 11 throw the pads 7 to the brake lining 25, instant braking occurs.

I

Claims (1)

Invention Formula An automatic clutch-brake, comprising a housing, concentrically located in it leading and driven half couplings, spring-loaded to the body, pads with rods located in the radial holes of the driven half coupling, and connecting rods connecting the pads to the leading coupling half, so that, in order to improve the reliability of operation by providing a fixed outlet brake pads from the body at elevated rotational speeds of the driven half coupling, it is equipped with two-arm levers, pivotally mounted on the driven coupling half, inertial weights fixed on one end of the levers and immobilized on the other ends of the cool levers with at least one protrusion, which engage with the hollows of the rods. g eleven fzg.2 15 Rig4