Spring brake actuator
AssigneeHaldex Brake Products AB
InventorLars Severinsson
Life of this patent
Estimating the term…
Abstract
A spring brake actuator is mounted with its shaft connected to the rotational operative shaft of a service brake actuator. The spring brake actuator has a clock spring, which is mechanically charged at a rotation of the actuator shaft in a brake release direction. It also has an electric coil for keeping when electrically energized—the clock spring in its charged condition. Further, it has means for transferring the rotative energy of the clock spring to the actuator shaft in a brake applying direction, when the coil is energized, but allowing free rotation of the shaft in either direction, when the coil is energized.
Claims7
A spring brake actuator for use in conjunction with a service brake actuator having a rotational operative shaft, the spring brake actuator having an actuator shaft in rotative communication with the service brake actuator shaft, characterized by
- a clock spring or spiral spring, attached at its outer end to a spring brake actuator housing and mechanically charged at a rotation of the actuator shaft in a brake release direction,
- an electric coil for keeping—when electrically energized—the clock spring in its charged condition, and
- transfer means for transferring the rotative energy of the clock spring to the actuator shaft in a brake applying direction, when the coil is deenergized, but allowing free rotation of the shaft in either direction, when the coil is energized.
Dependencies are inferred from the claim text.