Electric drum or drum-in-hat park brake
AssigneeAkebono Brake Industry Co., Ltd.
InventorKenneth Eric Gutelius
Life of this patent
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Abstract
A linear actuation assembly comprising: (a) a differential assembly and (b) a pair of linear actuators in communication with the differential assembly; wherein the pair of linear actuators are movable along an axis so that during movement of each of the pair of linear actuators a pair of brake shoes are moved to create a brake force or moved to release a brake force, and wherein the differential assembly distributes power equally to each of the pair of linear actuators until resistance of one of the brake shoes increases then the differential assembly ceases to provide power to the brake shoe with increased resistance and distributes the power from the brake shoe with increased resistance to a brake shoe of lower resistance until a brake force is created.
Claims17
A linear actuation assembly comprising:
- a. a differential assembly;
- and
- b. a pair of linear actuators in communication with the differential assembly;
- wherein the pair of linear actuators are movable along an axis so that during movement of at least a portion of each of the pair of linear actuators a pair of brake shoes respectively are moved to create a parking brake force or moved to release a parking brake force,
- wherein when a parking brake is applied, the differential assembly distributes power equally to each of the pair of linear actuators until resistance of one of the pair of brake shoes increases then the differential assembly ceases to provide power to a brake shoe with increased resistance and distributes the power from the brake shoe with increased resistance to a brake shoe of lower resistance until the parking brake force is created,
- wherein the differential assembly is located between the pair of brake shoes,
- wherein the differential assembly is connected to a motor and the motor provides the power to the differential assembly and the differential assembly transfers power to the pair of linear actuators, and
- wherein the motor drives a worm gear and the worm gear transfers the power to a ring gear of the differential assembly.
A brake assembly comprising:
- a. a pair of spaced apart brake shoes each including a first end and a second end;
- and
- b. a linear actuator assembly located between the first end of the pair of spaced apart brake shoes, the linear actuator assembly comprising:
- i. a motor,
- ii. a differential assembly in communication with the motor, and
- iii. a pair of spaced apart linear actuators in communication with the differential assembly and each of the pair of spaced apart linear actuators in communication with a first end of one of the pair of spaced apart brake shoes;
- wherein when a parking brake is applied, the motor supplies power to the differential assembly and the differential assembly distributes the power to each of the linear actuators and the linear actuators move the brake shoes equally until one of the brake shoes experience a higher resistance and then the differential assembly shifts power and supplies additional power to the brake shoe with a lower resistance, and
- wherein a torque multiplication assembly is located between and in communication with the differential assembly and the linear actuators so that torque from the differential assembly is increased and transferred to each of the drive gears of the linear actuators, rotational speed of the drive gears within the linear actuators are lower than the rotational speed of the differential assembly, or both.
Dependencies are inferred from the claim text.