Transmission brake
AssigneeHaldex Brake Products AB
InventorsLars Severinsson, Hakan P. O. Larsson
Life of this patent
Estimating the term…
Abstract
A transmission brake is arranged in connection with an electric motor for an electric brake. The transmission brake shall allow rotation of the motor shaft in a brake applying direction, but when motor current is no longer supplied, the shaft shall be locked. Rotation of the shaft in the brake release direction presupposes reverse rotation of the motor. Clutch means are arranged between the shaft and a non-rotational housing. For accomplishing an engagement of the clutch means at a rotation of the shaft but not the motor in the brake release direction there are ramp means.
Claims8
A transmission brake for a rotational member (4;
- 4A) driven by a motor means (3, 9;
- 3A, 9A) in a drive direction, the transmission brake allowing rotation of the rotational member in the opposite direction only to the extent that the motor means rotates in this opposite direction, characterized by clutch means (14, 17;
- 14A, 17A) between the rotational member (4;
- 4A) and a non-rotational housing (1, 2;
- 1A′) and ramp means (8, 10, 18, 19;
- 8A, 10A, 18A 19A) for accomplishing a disengagement of the clutch means at a rotation of the rotational member but not the motor means (3, 9;
- 3A, 9A) in said opposite direction.
A transmission brake according to any of the preceding claims, characterized in that rollers (18;
- 18A) are arranged between inclined ramp surfaces (8′, 19′) on a ramp ring (8;
- 8A), connected to a rotor (9;
- 9A) of the motor (3, 9;
- 3A, 9A), and a ramp sleeve (19;
- 19A) for disengaging the clutch means (14, 17;
- 14A, 17A) against the spring bias (15;
- 15A).
Dependencies are inferred from the claim text.