Abstract: A braking device includes a guide piston which surrounds the outer periphery of a rod part of a second slave piston, a cup seal which is mounted on the second slave piston, and a seal member which is provided on the guide piston. The second slave piston includes an enlarged diameter portion which comes into contact with an axial-direction surface of the guide piston when the second slave piston is in the initial position, and the enlarged diameter portion is provided with a cut-out section which extends in the internal diameter direction of the second slave piston.

Abstract: A brake fluid pressure control system for a vehicle is provided with: a master cylinder activated by the operation of a brake pedal; a motor cylinder device that generates brake hydraulic pressure in response to an operation amount of the brake pedal; first brake fluid flow lines that allow the master cylinder to communicate with wheel cylinders; two-position three-way valves arranged at connection points between the first brake fluid lines and second brake fluid lines. The two-position three-way valves switch between a state in which the master cylinder communicates with the wheel cylinder and a state in which the motor cylinder device communicates with the wheel cylinder.

Abstract: First main and second hydraulic pressure paths, master cut valves configured to open and close the first and second main hydraulic pressure paths, respectively, a slave cylinder that operates in accordance with an operation amount of a brake operator, a first communication path that communicates from the slave cylinder to the first main hydraulic pressure path, and a second communication path that communicates from the slave cylinder to the second main hydraulic pressure path are provided. The slave cylinder includes a single hydraulic pressure chamber. The slave cylinder communicates with the first and second communication paths through a common flow path connected to the hydraulic pressure chamber. The slave cylinder is configured to be able to increase a pressure on a downstream side of the first or second main hydraulic pressure path. An on-off valve is provided in at least one of the first and second communication paths.

Abstract: Each pad return spring includes a lug piece attachment portion that is attached to a corresponding lug piece, and a pad return portion. The lug piece attachment portion of each pad return spring includes a first piece that is disposed on a first surface, on a disc rotor side, of the corresponding lug piece, a second piece that is disposed on a second surface, on the opposite side to the disc rotor side, of the corresponding lug piece, and a connection piece that connects the first piece and the second piece. The lug piece attachment portion of each pad return spring has a substantially U shape in section. The lug piece attachment portions are formed with engagement claw portions, and the lug pieces are formed with engagement grooves.

Abstract: A vehicle disc brake includes a caliper body, pistons and a pair of friction pads. The caliper body has a pair of operation arms and a bridge portion. Each operation arm has a cylinder bore and a pair of pad guide grooves. The pistons are each inserted into the corresponding cylinder bore. Each friction pad has a lining and a back plate. Each friction pad further includes a pair of lug pieces and a projection. The lug pieces are accommodated in the pad guide grooves so that the friction pads are movable in an axial direction of a disc rotor. The projection is provided so as to be positioned inside an opening portion of the piston with a gap from an inner circumferential surface thereof.

Abstract: One embodiment provides a vehicle disc brake, including a caliper body, a caliper bracket, a pair of friction pads and pad retainers. Lengths of a part of reacting claws of the caliper body are set so that distal end portions thereof are disposed further radially outwards in a radial direction of a disc brake rotor than inward pieces of retainer portions of pad retainers. And, distal end portions of the inward pieces are brought into abutment with lug pieces of the friction pads in a position which lies further inwards of the caliper body than circumferential end faces of these reacting claws.

Abstract: A vehicle brake hydraulic pressure control apparatus includes a pressure increasing section, a holding section, and a determination section and wheel speed sensors. The pressure increasing section increases a brake hydraulic pressure by driving a motor. The holding section holds a brake hydraulic pressure. The determination section determines whether or not the motor is malfunctional. The wheel speed sensors detect whether or not a vehicle which is at a halt starts to move. If the wheel speed sensors detect that the vehicle starts to move while the holding section is executing a holding control, the pressure increasing section executes a hydraulic pressure re-increasing control by driving the motor, and the determination section determines whether or not the motor is malfunctional based on a detection result by the wheel speed sensors after the brake hydraulic pressure is started to be increased by the hydraulic pressure re-increasing control.

Abstract: A first slave piston and a second slave piston are disposed in tandem in series within a cylinder body, and the pistons are arranged so that part of the shaft section of the second slave piston overlaps with the inner periphery of an opening section provided in the backward side, in the displacement direction, of the first slave piston. A long hole extending along the axial direction of the second slave piston is provided in the shaft section, and a connection pin which regulates the initial position of the second slave piston is inserted into the long hole.

Abstract: A disk brake includes a retainer part of a pad retainer provided with an outside section, back section, and inside section. A pad rebounding section is formed by inclining the leading end of a strip, which extends in the disk rotor direction from the end of the inside section away from the disk rotor with an elastic loop section therebetween, toward the outside in the radial direction of the disk. During travel, a gap is formed between the inside section and the strip of the pad rebounding section, and when a lug piece moves inward, the pad rebounding section and the inside section come into contact with each other, the inside section is pressed against an inside surface in the radial direction of the disk, the back section is elastically deformed, and the elastically deformed back section presses the lug piece toward the center side of a caliper body.

Abstract: In a vacuum booster for a vehicular brake, at least one of flat front attachment portion and flat rear attachment portion has a central disc portion which is concentric with a fitting cylindrical portion and plural side disc portions which are disposed around the central disc portion so as to be continuous with the central disc portion and to be spaced from each other. Bolts are inserted through at least a pair of side disc portions of the plural side disc portions.

Abstract: A vehicle brake hydraulic control apparatus according to one embodiment includes: a suction valve; a pump; a motor for driving the pump; and a control unit controlling the suction valve and the motor through connection/disconnection of power thereto. The control unit includes: a detection module configured to detect a back electromotive voltage generated due to an inertia rotation of the motor after disconnection of power; a voltage check module configured to check whether a voltage condition is satisfied or not that the back electromotive voltage is equal to or less than a given voltage; and a time check module configured to check whether a time condition is satisfied or not that a given time has passed after the voltage condition has been satisfied. And, the control unit closes the suction valve when the time condition is satisfied.

Abstract: A hydraulic control apparatus is disclosed which includes: a base body; and a housing to be fixed to one surface of the base body. The housing includes an opening facing the one surface of the base body. The opening includes a flange portion formed on and projected outwardly from an opening edge portion. The flange portion includes a screw-formed housing fixing hole for fixing the housing to the base body using a fastening member and a reference hole for provisionally fixing the housing when assembling parts to the housing. The reference hole is formed by lightening the flange portion and arranged parallel to the housing fixing hole.

Abstract: A pad retainer of a vehicle disc brake includes: a pair of retainer portions mounted in pad guide grooves; a connecting piece connecting the pair of retainer portions together; and pad returning portions configured to bias the friction pads to a side opposite to the disc rotor. Each of the pad returning portions includes an elastic loop portion formed into an arc shape by bending a narrow elongated piece, which extends in a direction opposite to the disc rotor from an inner side in a disc radial direction of a deep side piece of the retainer portion, and then back towards the disc rotor; and a holding portion extending from a bent-back end of the elastic loop portion towards the disc rotor and configured to hold a lug piece of the friction pad.

Abstract: A braking device includes a guide piston which surrounds the outer periphery of a rod part of a second slave piston, a cup seal which is mounted on the second slave piston, and a seal member which is provided on the guide piston. The second slave piston includes an enlarged diameter portion which comes into contact with an axial-direction surface of the guide piston when the second slave piston is in the initial position, and the enlarged diameter portion is provided with a cut-out section which extends in the internal diameter direction of the second slave piston.

Abstract: According to one embodiment, a vacuum booster includes a booster shell and a booster piston which divides an interior of the booster shell into a front vacuum chamber and a rear operation chamber. The vacuum booster further includes a valve cylinder in which a control valve controls a communication state of the operation chamber depending on a movement of an input rod. A bearing cylinder is provided on a rear wall of the booster shell. A bearing bush is mounted in the bearing cylinder to support the valve cylinder, and a seal lip is provided at a rear end of the bearing bush integrally therewith to contact elastically closely with the valve cylinder. A grease reservoir is provided in an inner surface of the bearing bush, and an extension grease reservoir is provided in an inner surface of the seal lip.

Abstract: A brake fluid pressure control apparatus for a vehicle includes a parameter calculation unit configured to calculate a rollover detection parameter; and a steering maneuver determination unit configured to determine whether an abrupt steering maneuver is made. The parameter calculation unit is configured to calculate a first composition roll angle as the rollover detection parameter, by combining at a predetermined weight assignment ratio a first roll angle equivalent to an actual roll angle with a second roll angle obtained using a parameter which changes with a phase earlier than the first roll angle, and to calculate the first composition roll angle by changing the weight assignment ratio such that a weight of the second roll angle is higher when the steering maneuver determination unit determines that an abrupt steering maneuver is made than when the steering maneuver determination unit determines that the abrupt steering maneuver is not made.

Abstract: A wheel deceleration calculating sections individually calculate, as negative values, wheel decelerations of front and rear wheels. If, at a time when the antilock braking control for at least one of the right and left front wheels is started or at a time when the antilock braking control for at least one of the right and left rear wheels is started, (i) a maximum value of the wheel decelerations calculated by the wheel deceleration calculating sections is equal to or larger than a first predetermined value and (ii) a difference between the wheel decelerations of the right and left front wheels or the right and left rear wheels which are in an antilock braking control state is equal to or larger than a second predetermined value, a split road determining section determines that road surfaces constitute a split road.

Abstract: A brake hydraulic pressure control apparatus for a vehicle includes: a base member; a control housing including a storage space for storing an electromagnetic valve on one face of the base member and a coil assembly; and a pump driving motor on a back face of the base member. The base member are provided with: two housing mounting penetration holes through which housing mounting screws for fixing the control housing are to be inserted; two motor mounting holes into which motor mounting screws for fixing the motor are to be inserted; and a rotation shaft storage hole into which a rotation shaft of the motor is to be stored, wherein the housing mounting penetration holes and the motor mounting holes are respectively disposed point-symmetrically with respect to the center of the rotation shaft storage hole.

Abstract: One embodiment provides a bar-handle vehicle brake control apparatus. The control apparatus includes an acceleration acquiring part and a control unit. The acceleration acquiring part acquires a tangential acceleration at a point where a straight line which connects a gravity center of a bar-handle vehicle and a front wheel axle intersects a circle which is centered at the front wheel axle. The control unit controls a front wheel brake based on the tangential acceleration.

Abstract: A vehicle brake hydraulic pressure control apparatus includes an acquiring section, first and second control quantity calculators, and a holding section. The acquiring section acquires engine restarting information. The first control quantity calculator calculates a first control quantity. The second control quantity calculator calculates a second control quantity larger than the first control quantity. The holding section holds a brake hydraulic pressure. If the brake hydraulic pressure lowers from a point in time when the vehicle is stopped to a point in time when the acquiring section acquires the engine restarting information, the holding section holds the brake hydraulic pressure with the first control quantity. If the acquiring section acquires the engine restarting information, the holding section holds the brake hydraulic pressure with the second control quantity. If the restarting of the engine is completed, the holding section holds the brake hydraulic pressure with the first control quantity).