Actuating expanding device for automobile drum brake and drum brake
A drum brake and brake shoe technology, applied in the direction of brake parts, brake actuators, gear shifting mechanisms, etc., can solve the problem of small lift, small lift of the central drive shaft, and the brake shoes cannot be braked synchronously, etc. problems, to achieve the effect of reducing thermal recession, short braking distance, and conducive to heat dissipation
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[0029] The drum brake of the present invention is mainly composed of a brake drum 1 , a brake base plate 2 , a brake shoe 3 , a friction plate 4 , a return spring 5 and an actuating and opening device.
[0030] The brake drum 1 and the vehicle axle are slidably connected by means of rolling bearings, and the brake base plate 2 is fixedly connected to the vehicle axle by means of connecting pieces. The lower ends of the two brake shoes 3 are hinged with the brake base plate 2 through the support pins 13 respectively. The opposing surfaces of the top ends of the two brake shoes 3 are respectively machined with force-bearing arc surfaces 14 . The axes of the two force-bearing arc surfaces 14 are on the same horizontal plane. The two friction plates 4 are respectively fixed on the outer arc surfaces of the two brake shoes 3 . The return spring 5 is fixedly connected between the two brake shoes 3 . The actuating opening device is arranged between the top ends ...
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