brake

Abstract

The present invention provides a brake. The brake includes a yoke core, a first movable plate, a plurality of friction discs, a second movable plate, a coil, an armature and an elastic member. The yoke core is concentric in sequence from the inside to the outside. A first installation space and a second installation groove are distributed, and the first installation space passes through the center of the yoke core along the axial direction of the yoke core; the first movable plate is located in the first installation space Inside, and close to the first shaft end of the yoke core; a plurality of friction discs are sequentially arranged in the first installation space along the axial direction of the yoke core, and are all located in the first The side of the movable plate close to the second shaft end; the coil is arranged in the second installation groove; the armature is located at the second shaft end of the yoke core, and the armature is connected to the first movable The plates are connected by a connecting piece; the elastic piece has a pre-tightening force to keep the armature away from the yoke core. The thickness of the brake provided by the invention is relatively thin.

Description

technical field [0001] The invention belongs to the technical field of mechanical brakes, and in particular relates to a brake. Background technique [0002] There are open and closed brakes, no matter it is open or closed, the assembly method of the main parts is stacked, that is, the yoke, armature, friction disc and tail plate are stacked in sequence, although the structure is simple, but the whole is thicker. [0003] As the technical requirements for electromagnetic brakes are getting higher and higher, the thickness has gradually become a key parameter to measure the performance of the brakes. Especially in some special applications, the overall thickness of the brakes must be small, and the traditional stacked structure brakes can no longer meet the requirements. We can only rely on the use of better materials and finer processes to compress the thickness of the above-mentioned parts as much as possible to reduce the total stack thickness, which inevitably produces ot...

AI Technical Summary

Problems solved by technology

[0004] (1) If the thickness of the yoke is reduced, the coil space will be reduced, the coil magnetic field will be weakened or the heating power of the coil will be increased;

[0005] (2) After the thickness of the armature, friction disc and tail plate is thinned (the ratio of diameter to thickness is increased), the overall rigidity is weakened, and creep is easy to occur, or stress deformation or thermal stress deformation occurs during work. The temperature rises quickly in the medium (because of less material and small heat capacity), it is easy to cause braking torque attenuation or even completely damage the brake;

[0006] (3) After the thickness of the friction disc is reduced, the structural strength is insufficient, the processing difficulty increases, the verticality between the middle hole and the friction surface is poor, and the matching length with the shaft or bushing is small, the friction disc is prone to swing during rotation, Make abnormal noise and increase the drag torque; when rotating at high speed, the surface of the friction disc is also easily ablated locally, thereby reducing the friction torque and affecting the braking effect and safety;

[0007] (4) The extremely thin friction pair parts (armature, friction disc, tail plate) will amplify the noise (similar to the effect of the horn diaphragm) or make the noise sharper when rubbing;

[0008] (5) The friction radius of the friction disc is large, and the friction line speed at the same motor speed is high, sometimes exceeding the suitable working line speed of the material, increasing the wear rate and reducing the braking effect

Images