Drive actuator

Patent metadata

Field	Value
Publication number	US-9677332-B2
Application number	US-201615140984-A
Country	US
Kind code	B2
Filing date	Apr 28, 2016
Priority date	Apr 30, 2015
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

An actuator drive, for blinds, roller shutters and the like, has a drive motor and a centrifugal brake. A rotational disk is coupled to a drive shaft of the drive motor via a shaft flange. Two centrifugal shoes are smoothly guided in the rotational disk. In the unpowered state, brake shoes of the centrifugal shoes engage, frictionally or in a positive-locking way on an outer surface of a friction ring fixed to the motor housing. Upon starting of the drive motor, the brake shoes release the friction ring. The radial displacement of the brake shoes is maintained until the drive motor comes to a stop, wherein the brake shoes 8 are drawn radially inward by spring elements and function again as a locking mechanism. The spring elements are pretensioned such that the brake shoes effect a sufficient retaining torque.

First claim

The invention claimed is:

1. A drive actuator, comprising: a drive motor, including a drive shaft and a motor housing; and a centrifugal brake coupled to the drive motor, the centrifugal brake comprises:
a rotational disk coupled to the drive shaft;
a friction ring fixed with respect to the motor housing;
two or more centrifugal shoes arranged to be radially moveable between an inner position and an outer position and guided in the rotational disk; and
at least one spring element urging the centrifugal shoes radially inwardly towards the inner position,
wherein the centrifugal shoes engage frictionally or in a positive-locking way with the frictional ring when the drive motor is stationary, and move out of engagement with the friction ring when the drive motor is rotating.

2. The drive actuator of claim 1 , wherein the rotational disk is coupled to the drive shaft via a shaft flange.

3. The drive actuator of claim 1 , wherein a stop is formed in the rotational disk to limit the radially outward movement of the centrifugal shoes.

4. The drive actuator of claim 3 , wherein each centrifugal shoe has a projection arranged to engage the stop.

5. The drive actuator of claim 4 , wherein the stop is formed by a pair of recesses formed in the rotational disk and each projection extends into a respective recess.

6. The drive actuator of claim 1 , wherein the friction ring is fixed to the motor housing.

7. The drive actuator of claim 1 , wherein each centrifugal shoe has a brake shoe arranged to engage a radially outer surface of the friction ring.

8. The drive actuator of claim 7 , wherein the brake shoes and the friction ring have a non-smooth contact surface creating positive locking engagement when the brake shoes engage the friction ring.

9. The drive actuator of claim 8 , wherein the non-smooth contact surfaces have a saw-tooth configuration.

10. The drive actuator of claim 1 , wherein the centrifugal shoes are interconnected by the at least one spring element.

11. The drive actuator of claim 10 , wherein there are two spring elements interconnecting the centrifugal shoes.

Assignees

• Johnson Electric Sa

Inventors

• Waehrisch Sten
• Kulke Matthias
• Winkler Wolfgang

Classifications

• F16D49/16 Primary

  Brakes with two brake-blocks (self-tightening F16D49/20) · CPC title

• E06B9/72

  comprising an electric motor positioned inside the roller · CPC title

• F16D63/006

  Positive locking brakes · CPC title

• E06B9/322 Primary

  Details of operating devices, e.g. pulleys, brakes, spring drums, drives ({operating devices E06B9/68} ; devices of general interest specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material B65H75/34) · CPC title

• F16D59/00

  Self-acting brakes, e.g. coming into operation at a predetermined speed · CPC title