Motor disc brake system
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsYasuhiko Fujita, Toshiaki Arai, Masami Ogura
Life of this patent
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Abstract
In a motor disc brake system using an electric motor as a drive source of a thrust generating device that can move a piston in advancing and retracting directions, a slide bearing is interposed between a piston and a brake caliper carrying the piston for receiving a side thrust which is applied from a friction pad to the piston during braking. This serves to suppress increase in the slide resistance of the piston even under the action of such side thrust, enabling a strong braking force to be provided with use of a motor of small capacity.
Claims13
A motor disc brake system including a brake disc connected to a rotting member to be braked, a friction pad opposed to a side surface of the brake disc for advancing and retracting movement relative to the brake disc, a piston for pressing a back surface of the friction pad when the piston advances, a brake caliper mounted to a stationary bracket and carrying the piston such that the piston is capable of advancing and retracting toward the brake disc and is prevented from rotating relative to the brake capiler, and a thrust generating device provided on the brake caliper and capable of generating a thrust to cause advancing and retracting movements of the piston, said thrust generating device comprising an electric motor, a drive shaft connected to an output shaft of the electric motor, a drive shaft connected to an output shaft of the electric motor, a rotary shaft disposed coaxially with the piston and screw-fitted t the piston by a ball screw, and a reduction device disposed shaft for driving the rotary shaft at a reduced speed, wherein a slide bearing is interposed between the piston and the brake caliper for carrying a side thrust which is applied from the friction pad to the piston during braking.
Dependencies are inferred from the claim text.