Wedge cam brake

Abstract

A wedge cam brake wherein a ball screw (13), which is screwed into a ball nut (38) to which a wedge cam (20) is integrally provided, is rotationally driven, thereby moving the wedge cam (20) along thedirection of the rotational axis of the ball screw (13) to a braking position and, by means of the cam operation of the wedge cam, the base ends of brake arms (3) perform a braking operation while clamping a pair of pad assemblies (6, 6) from both sides of a brake rotor (100). The wedge cam brake is equipped with compression coil springs (17) for pressing and biasing the ball nut (38) toward thebraking position, where the wedge cam (20) opens the base ends of the brake arms (3), and a spring-holding mechanism (30) that holds the compression coil springs (17) in an energy-storing state.

Description

technical field [0001] This invention relates to wedge cam brakes. Background technique [0002] Conventionally, in a disc brake for a vehicle equipped with a brake, especially a railway vehicle that requires a strong braking force, it is known that the base ends of a pair of brake arms are spread out by the cam action of a wedge cam, and the disc brakes are separated from both ends of the brake rotor. Wedge cam brakes that side clamp against these open end pad assemblies for braking action. [0003] In addition, the use of electric power instead of fluid pressure such as hydraulic pressure and air pressure has been considered as a power source for brakes of railway vehicles (see Patent Document 1). [0004] Electric braking device 500 such as Figure 30 As shown, it includes: a disc (brake rotor) 520 that rotates with the wheel; a brake block (pad assembly) 530 that abuts against the disc 520 and imparts friction; The mechanical spring 550 that applies force in one direct...

AI Technical Summary

Problems solved by technology

[0009] However, when electrifying the electric driver 540 as a driving source, there is a problem in that the power consumption of the electric motor is too large in order to obtain a predetermined response, and the electric motor is overheated due to heat generation, and the fail-safe when the power is turned off and other problems, the size of the electric brake device 500 will increase, and it will be difficult to store it in a predetermined space.

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