Brake

Abstract

The invention provides a brake which comprises a magnet yoke iron core, a first movable plate, a friction disc, a first coil, a second coil, an armature and an elastic piece. A first installation space and a second installation groove are sequentially and concentrically distributed in the magnet yoke iron core from inside to outside, the first installation space penetrates through the center position of the magnet yoke iron core in the axial direction of the magnet yoke iron core, the magnet yoke iron core is further provided with at least one third installation groove coaxial with the second installation groove, and the first movable plate is located in the first installation space; the friction disc is arranged in the first installation space and located on the side, close to the second shaft end, of the first movable plate; the first coil is arranged in the second installation groove; the second coil is arranged in the third installation groove; the armature is connected with the first movable plate through a connecting piece; and the elastic piece has a pre-tightening force which enables the armature to be far away from the magnet yoke iron core. The brake 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

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