摘要:
A vehicle parking brake system for a vehicle including: a non-rotary body; a rotary drum; brake shoes; an anchor member disposed between anchor-member-side end portions of the respective brake shoes; a transmitting member interconnecting transmitting-member-side end portions of the respective brake shoes; and a parking-brake operating apparatus configured to predict a torque application direction in which a torque is to be applied to the wheel during stop of the vehicle, and to press the brake shoes against an inner circumferential surface of the rotary drum, by moving a primary one of the brake shoes that serves as a primary shoe upon application of the torque to the wheel, in a direction away from the anchor member, without moving a secondary one of the brake shoes that serves as a secondary shoe upon application of the torque to the wheel.
摘要:
A friction brake device for a vehicle includes: a hydraulic brake unit including a piston member for pressing a friction member by advancement; an electric brake unit including a nut member being relatively movable in a piston movement direction with respect to the piston member by a motor and for pressing the piston member by advancement; a piston return mechanism including a biasing member for making biasing force, oriented in a retreat direction, elastically act on the piston member in accordance with a relative advancement amount of the piston member with respect to the nut member; and a controller for controlling the motor. The controller determines whether an adjustment permission condition associated with a wear amount of the friction member is satisfied. When the condition is satisfied, the controller allows the motor to perform a relative position adjustment of the nut member with respect to the piston member.
摘要:
A vehicle brake control device is configured to correct deformation failure of a seal member and inhibit insufficient pullback of a pressing member caused by insufficient deformation of the seal member. Within a time period from a start of a lock operation to an end of the release operation, a W/C pressure is automatically increased and insufficient deformation of a seal member is corrected. It is thus possible to generate a large restoring force by the seal member when pulling back a piston, and the piston can be pulled back based on the restoring force. The piston is therefore sufficiently moved, and it is possible to inhibit insufficient piston pullback. Further, it is possible to cause a brake pad to be separated from a brake disc by a predetermined distance, and it is possible to inhibit a feeling of drag of a brake from being imparted to a driver.
摘要:
A brake apparatus for restraining rotation of a wheel of a vehicle by application of a brake that is to be activated for causing a friction member held by a non-rotatable body, to be pressed against a brake rotor that is to be rotated together with the wheel, through a piston that is movable in an axial direction of the piston. The brake apparatus includes: (a) a power drive device; (b) a driven member that is to be moved, by the power drive device, relative to the piston in the axial direction; and (c) an engaging portion that is provided in one of the driven member and the piston, such that the piston is held in engagement with the driven member through the engaging portion. The engaging portion is disposed such that, during release of the application of the brake, the piston is movable rearwardly while being held in engagement with the driven member through the engaging portion.
摘要:
In an electric parking brake system including a tension control unit that controls the friction member pushing force in a brake by controlling the tension of a cable, the target tension is set to a larger value when a vehicle is maintained at a standstill on a downhill slope than when the vehicle is maintained at a standstill on an uphill slope.
摘要:
A friction brake device for a vehicle includes: a hydraulic brake unit including a piston member for pressing a friction member by advancement; an electric brake unit including a nut member being relatively movable in a piston movement direction with respect to the piston member by a motor and for pressing the piston member by advancement; a piston return mechanism including a biasing member for making biasing force, oriented in a retreat direction, elastically act on the piston member in accordance with a relative advancement amount of the piston member with respect to the nut member; and a controller for controlling the motor. The controller determines whether an adjustment permission condition associated with a wear amount of the friction member is satisfied. When the condition is satisfied, the controller allows the motor to perform a relative position adjustment of the nut member with respect to the piston member.
摘要:
An EPB-ECU is an electric parking brake control device which generates a braking force by driving an electric motor to press pads and to a disc rotor. The EPB-ECU includes a current supply unit for supplying a motor current to the electric motor and stopping the supply of the motor current when the motor current reaches a predetermined target current value, a supply time measurement unit for measuring a supply time of the motor current, a waiting time setting unit for setting a waiting time from when the supply of the motor current is stopped to when the supply of the motor current is restarted next time on the basis of the measured motor current supply time, and a control unit for instructing the current supply unit to supply the motor current according to the set waiting time.
摘要:
In an electric parking brake system, the moving force-based target tension is set based on the inclination angle of a vehicle and the shift position, and the slack compensation amount is determined based on the inclination angle of the vehicle and the shift position. The control target tension is set to a smaller value from among the slack-based target tension, which is the sum of the moving force-based target tension and the slack compensation amount, and the maximum value of the output power that can be produced by an electric motor. The electric motor is controlled such that the tension of the cable matches the control target tension (the slack-based target tension, in most cases).
摘要:
An optical head device may include a frame type of laser beam emitting element provided with a heat radiating fin on which a laser chip is mounted, a device frame on which the laser beam emitting element, a light receiving element and an optical system are mounted, and a heat radiation member formed of material having a superior heat conduction property. The upper face of the laser beam emitting element is fixed to the device frame, and an under face of the heat radiating fin which corresponds to a portion where the laser chip is mounted is exposed on an outer side to form an exposed part, and the heat radiation member is disposed to extend over the exposed part and the device frame. The device frame may include a first protective cover covering the optical disk side of the optical elements, and a second protective cover which covers the optical disk side of the objective lens drive mechanism and which is separately formed from the first protective cover and made of material having a superior heat conduction property, and a part of the second protective cover is extended to a laser driver IC, which is disposed to be exposed on the optical disk side, to form a heat radiation part where heat generated in the laser driver IC is radiated.
摘要:
A brake apparatus for restraining rotation of a wheel of a vehicle by application of a brake that is to be activated for causing a friction member, to be pressed against a brake rotor, through a piston that is movable in an axial direction of the piston. The brake apparatus includes: (a) a power drive device; (b) a driven member that is to be moved, by the power drive device, relative to the piston in the axial direction; and (c) an engaging portion that is provided in one of the driven member and the piston, such that the piston is held in engagement with the driven member through the engaging portion. The engaging portion is disposed such that, during release of the application of the brake, the piston is movable rearwardly while being held in engagement with the driven member through the engaging portion.