brake

Abstract

The invention provides a brake. The brake includes a yoke core, a movable plate, a friction disc, a coil, an armature and an elastic member. The yoke core is concentrically distributed with a first installation space and a second The installation groove, the first installation space passes through the center of the yoke core along the axial direction of the yoke core, and the opening of the second installation groove faces the second axial end of the yoke core; The movable plate is located in the first installation space and is close to the first shaft end of the yoke core; the friction disc is arranged in the first installation space and is located in the movable plate close to the first shaft end One side of the two shaft ends; 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 movable plate through a connecting piece; The elastic member 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] Brakes have open and closed types. Whether it is open or closed, the main parts are assembled in a stacked manner, that is, the yoke, armature, friction disc and tail plate are stacked in sequence. Although the structure is simple, the overall thickness is thick. [0003] With the increasing technical requirements for electromagnetic brakes, 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 leads to other deficien...

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

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