Disk brake
AssigneeHitachi Automotive Systems, Ltd.
InventorsTakahiro Ito, Kenichiro Matsubara, Hirotaka Oikawa
Life of this patent
Estimating the term…
Abstract
There is provided a disk brake that can hold a required thrust force and maintain a stop state of a vehicle without increasing complexity in the disk brake even if the disk brake is operated in a high temperature state of a brake pad and then a temperature of the brake pad is reduced. In the disk brake 1, an electric motor 8 is driven to thrust a piston 6, the piston 6 presses the brake pad 5 against a disk rotor 2, and the piston 6 is held in the pressed position, the electric motor 8 is re-driven after a predetermined time from a start of holding of the piston 6, and a driving condition of the electric motor 8 after re-driving is determined based on a change in value of a current supplied to the electric motor 8 by the re-driving.
Claims10
A disk brake comprising:
- a caliper in which a piston presses a brake pad placed to face a disk rotor;
- a piston thrust mechanism that is provided in the caliper and thrusts the piston with an electric motor;
- a piston holding mechanism that holds the piston in a position thrust by the piston thrust mechanism;
- and
- control means that drives the electric motor, the control means including motor driving condition determination means that in a second clamping process, which begins after a given amount of time has elapsed since and end of a first clamping process, re-drives the electric motor after a predetermined time from a start of holding of the piston by the piston holding mechanism, and determines a driving condition of the electric motor for a third or subsequent clamping process, based on a change in value of a current supplied to the electric motor, which change in value is measured beginning with the re-driving associated with the second clamping process, wherein
- a determination to stop motor rotation, and thereby finish the first clamping process, is made based on a measured current value, and
- at least one of the second and third or subsequent clamping process is performed while the brake pad is clamped.
Dependencies are inferred from the claim text.