Brake assembly for an electric motor

Patent metadata

Field	Value
Publication number	US-11674557-B2
Application number	US-201917055818-A
Country	US
Kind code	B2
Filing date	Apr 25, 2019
Priority date	May 14, 2018
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

A brake assembly for an electric motor includes: a magnetic body, a winding, a bolt, a housing part with a brake surface, an armature disk, a brake pad plate, a shaft, a spring part, and a first bushing. The housing part is connected to the magnetic body by the bolt, with a positive fit in at least the circumferential direction. The first bushing is accommodated in a second bushing. The spring part supported on the housing part presses the first bushing and/or the second bushing toward the magnetic body. The radial clearance range covered by the armature disk includes the radial clearance range covered by the second bushing, and the axial region covered by the armature disk includes the axial region covered by the second bushing.

First claim

The invention claimed is:

1. A brake assembly for an electric motor, comprising:
a brake pad plate;
a shaft;
a magnetic body;
a winding;
a housing part with a brake surface; and
an armature disk;
wherein the brake pad plate and the armature disk are arranged axially between the housing part and the magnetic body;
wherein a sealing element is connected and/or press-fitted in a non-positive manner to the housing part in a first axial region and to the magnetic body in a second axial region, the sealing element radially surrounding the armature disk and the brake pad plate and/or covering and/or sealing a space region accommodating the armature disk and the brake pad plate in a direction of the environment, a thickened region and/or a radially-directed thickened region circumferential in a circumferential direction being arranged on the sealing element so that a nose region projects radially inward and adapted to limit the armature disk in the axial direction.

2. The brake assembly according to claim 1 , further comprising:
a bolt;
a spring part; and
a first bushing;
wherein the housing part is connected and/or connected with a positive fit in at least a circumferential direction to the magnetic body by the bolt, the first bushing is accommodated in and/or pressed into a second bushing, the spring part supported on the housing part is adapted to push the first bushing and/or the second bushing toward the magnetic body, a radial clearance range covered by the armature disk includes and/or encompasses a radial clearance range covered by the second bushing, an axial region covered by the armature disk includes, encompasses, and/or overlaps an axial region covered by the second bushing.

3. The brake assembly according to claim 2 , wherein the first bushing is formed of a softer and/or a more elastic material than the second bushing, the first bushing is formed of rubber, a rubberized material, a plastic material, and/or a polymer, the second bushing is formed of metal and/or steel, the first bushing is pressed into the second bushing, the first bushing includes an O-ring, the first bushing is slidingly mounted on the bolt and/or placed on the bolt with an accurate fit, and/or the armature disk is connected to the second bushing and/or the bolt with play and with a positive fit in the circumferential direction.

4. The brake assembly according to claim 2 , wherein the bolt is connected to the housing part by screws and is guided through a recess that extends radially through the magnetic body, a nut is screwed onto a threaded region provided on a side of the magnetic body facing away from the housing part, the bolt has a step by which the bolt rests against a step of a stepped bore in the housing part, the bolt is connected to the magnetic body by screws and routed through a recess that extends axially through the housing part, a nut is screwed onto a threaded region provided on a side of the housing part facing away from the magnetic body, and/or the bolt has a step by which the bolt rests against a step of a stepped bore in the magnetic body.

5. The brake assembly according to claim 2 , wherein an axial region covered by the second bushing is smaller than an axial region covered by the first bushing, the spring part is adapted to push the first bushing toward the magnetic body, and/or the axial region covered by the second bushing is equal to or greater than the axial region covered by the first bushing, the spring part adapted to push the second bushing toward the magnetic body.

6. The brake assembly according to claim 1 , wherein the driver includes an inner driver part, an outer driver part, and an intermediate layer arranged radially between the inner driver part and the outer driver part, the inner driver part and the outer driver part are spaced apart from each other, each of the inner driver part and/or the outer driver part includes an annular configuration, and/or the inner driver part is arranged radially within the outer driver part.

7. The brake assembly according to claim 6 , wherein the inner driver part has web regions that project radially outward and/or into the intermediate layer, and/or the outer driver part has web region that project radially inward and/or into the intermediate layer.

8. The brake assembly according to claim 6 , wherein the intermediate layer is formed of a plastic material, a sealing compound, an adhesive, a polymer, and/or an elastomer, the inner driving part and the outer driver part are formed of metal and/or steel, and/or a radial clearance range covered by the outer driver part and/or a radial clearance range covered by the web regions of the outer driver part overlaps with a radial clearance range covered by the inner driver part and/or overlaps with a radial clearance range covered by the web regions of the inner driver part.

9. The brake assembly according to claim 1 , wherein a sealing ring adapted to restrict the armature disk counter to the axial direction is arranged on the magnetic body, the sealing ring being accommodated in an annular groove provided in the magnetic body, a ring axis corresponding to an axis of rotation of the shaft.

10. The brake assembly according to claim 9 , wherein a spring force generated by the sealing ring and acting on the armature disk is greater in absolute amount than a spring force generated by an elastically tensioned and/or pretensioned nose region acting on the armature disk, in a released state of the brake assembly and/or when the winding is energized, a radial clearance range covered by the sealing element and/or by the nose region of the sealing element overlaps with a radial clearance range covered by the armature disk, and/or an axial region covered by the sealing element and/or the nose region of the sealing element overlaps with an axial region covered by the brake pad plate and/or abuts and/or abuts without overlap an axial region covered by the armature disk.

11. The brake assembly according to claim 9 , wherein a ring axis of the sealing ring corresponds to an axis of rotation of the shaft, and/or the nose region has an annular configuration and/or has a circumferential configuration in the circumferential direction, a ring axis of the nose region corresponding to the axis of rotation of the shaft and/or an axis of symmetry of the nose region corresponding to the axis of rotation of the shaft.

12. The brake assembly according to claim 1 , wherein the sealing element includes, on two axial end regions, a radially-directed depression and/or a reduction of a wall thickness, circumferential in the circumferential direction, adapted to accommodate a ring-shaped clamping element, a clamping ring, a clamp, and/or a tensioning ring.

13. The brake assembly according to claim 1 , wherein a ring part is arranged at a radial distance and/or a greatest radial distance located in a radial clearance range covered by the armature disk.

14. The brake assembly according to claim 1 , wherein the driver includes an inner driver part and an outer driver part connected to each other by an intermediate layer and/or the driver is arranged as a metal-plastic composite part, the brake pad plate including an inner tooth system that meshes with an outer tooth system of the outer driver part so that the brake pad plate is connected to the driver and/or to the outer driver part and/or the shaft in a torsionally fixed but axially displaceable manner, the inner driver part is connected to the shaft in a torsionally fixed manner, without play, and/or by a feather key connection, each of the inner driver part, the outer driver part, the intermediate layer, and/or the driver is arranged

Assignees

• Sew Eurodrive Gmbh & Co Kg

Inventors

• Fichtner-Pflaum Gerolf
• Rieger Florian

Classifications

• F16D2121/14

  Mechanical · CPC title

• B60B3/005

  in the section adjacent to rim · CPC title

• F16D2125/08

  Seals, e.g. piston seals · CPC title

• F16D65/0081

  Brake covers · CPC title

• F16D2121/22

  for releasing a normally applied brake · CPC title