# US 11,111,973 B2 · Drive mechanism

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- Number: US 11,111,973 B2
- Document ID: US11111973B2
- Status: Granted
- Kind: B2
- Application number: 16/523,076
- Filed: 2019-07-26
- Published: 2020-01-30
- Granted: 2021-09-07
- Earliest claimed: 2018-07-27
- Assignees: Stabilus GmbH
- Applicants: Stabilus GmbH
- Inventors: Madalina Gherman; Mihai-Augustin Vidrean; Sergei Mazepa; Magnus Hümmerich
- Web page: https://patentgrep.com/patent/US11111973B2

## CPC

- F16D 55/226: in which the common actuating member is moved axially {, e.g. floating caliper disc brakes}
- F16H 25/20: Screw mechanisms (with automatic reversal F16H25/12)
- F16D 65/186: {with full-face force-applying member, e.g. annular}
- F16D 2121/26: for releasing a normally applied brake
- F16D 2200/0034: non-metallic
- F16H 25/2454: {Brakes; Rotational locks}
- F16H 2025/2075: {Coaxial drive motors}
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16H: GEARING

## Abstract

A drive mechanism having a drive motor that rotatably drives a threaded spindle against a specific braking force generated by a pretensioned spring of a friction brake arrangement. The drive motor and the threaded spindle are arranged coaxially in a housing tube of the drive mechanism, and components of the friction brake arrangement are arranged in a tubular brake housing, which is arranged in an axially and rotationally fixed in the housing tube. A first end of the brake housing has one or more radially inwardly directed first stop shoulders and at a second end of the brake housing has one or more radially inwardly directed second stop shoulders. The brake housing has at its first end a radially circumferential ring with one or more radially resilient spring arms extending axially toward the second end, at the free ends of which spring arms are arranged the second stop shoulders.

## Claims

### Claim 1

A drive mechanism, comprising:
a housing tube;
a drive motor with drive shaft;
a threaded spindle rotatably drivable by the drive motor via the drive shaft, the drive motor and the threaded spindle being arranged coaxially in the housing tube;
a friction brake arrangement having a tubular brake housing axially and rotatably fixed in the housing tube, braking components, and a pretensioned spring, wherein the braking components and the pretensioned spring are arranged in the tubular brake housing, the braking components generating a braking force by the pretensioned spring that is surmounted by the drive motor to rotate the threaded spindle,
wherein the tubular brake housing has a first axial end and a second axial end, at least one radially inwardly directed first stop shoulder and a radially circumferential ring are arranged at the first axial end, at least one radially resilient spring arm extends from the circumferential ring axially toward the second axial end, and a respective second stop shoulder is arranged at each of the at least one spring arm.

### Claim 2 (depends on 1)

The drive mechanism according to claim 1, wherein the at least one spring arm includes a plurality of spring arms distributed evenly in a circumferential direction on the periphery of the brake housing.

### Claim 3 (depends on 1)

The drive mechanism according to claim 1, wherein the second stop shoulder is formed by an inner side of a latching hook extending radially and facing the first axial end of the brake housing, and an outer side of the latching hook faces the second axial end of the brake housing and is inclined from radially outer position to a radially inner position from the second axial end toward the first axial end.

### Claim 4 (depends on 1)

The drive mechanism according to claim 1, wherein the braking components include a first thrust washer, a brake disk, and a second thrust washer, and the pretensioned spring is a pretensioned compression spring axially supported against the first stop shoulders, and axially supported against the second stop shoulder via the first thrust washer, the brake disk, and the second thrust washer, each of the first thrust washer and the second thrust washer being axially displaceable and connected in a rotationally secure manner to the brake housing and the brake disk is axially displaceable and fixed with respect to rotation to the threaded spindle.

### Claim 5 (depends on 1)

The drive mechanism according to claim 1, further comprising a back-up ring arranged in an axially fixed manner in the housing tube, wherein the brake housing is directly or indirectly supported with its first end against the back-up ring.

### Claim 6 (depends on 1)

The drive mechanism according to claim 1, further comprising a guide bushing arranged in an axially fixed manner in the housing tube, wherein the second end of the brake housing is axially supported against the guide bushing.

### Claim 7 (depends on 1)

The drive mechanism according to claim 1, wherein the drive shaft is coupled to the threaded spindle via a flexible coupling.

### Claim 8 (depends on 7)

The drive mechanism according to claim 7, wherein the threaded spindle is rotatably mounted by a roller bearing arranged between the brake housing and the flexible coupling.

### Claim 9 (depends on 1)

The drive mechanism according to claim 1, wherein the brake housing consists of a plastic.

### Claim 10 (depends on 1)

The drive mechanism of claim 1, wherein the at least one spring arm is prevented from deflecting radially by the housing tube.