Abstract: According to one embodiment, there is provide a piston pump, including: a cylinder having a bottomed cylindrical shape; a piston slidable within the cylinder, the cylinder and the piston defining a pressure chamber therebetween; a suction valve unit disposed in a suction passage of the pressure chamber; and a discharge valve unit disposed in a discharge passage of the pressure chamber, wherein the piston includes a cylindrical piston portion and a large diameter piston portion provided to cover one end of the cylindrical piston portion, and wherein the large diameter piston portion includes a working fluid guide groove extending thereinside along the axial direction of the piston.

Abstract: A base body has flow path configuring portions, has inlet and outlet ports, a central mounting hole 31, a central flow path 51 penetrating the central mounting hole 31, first inner and outer mounting holes 32, 33 disposed upstream side of the central mounting hole 31, second inner and outer mounting holes 34, 35 disposed downstream side of the central mounting hole 31, a third mounting hole 36 disposed below the second outer mounting hole 35, a wheel side sensor mounting hole 46 disposed on an extension of the outlet port 22L between the first inner mounting hole 32 and the second inner mounting hole 34, and a hydraulic pressure source side sensor mounting hole 45 disposed on a center line X of the base body so as to straddle to extend to the flow path configuring portions across the center line X.

Abstract: An electrical connection structure of an electronic board includes: a board support member formed of synthetic resin; an electronic board fixed to the board support member; an electrical connection pad disposed on the electronic board; a bus bar disposed in the board support member; and a bonding wire that electrically connects the electrical connection pad and the bus bar. The bus bar includes: an exposed portion exposed in a face of the board support member; an embedded portion embedded in the board support member; and a connection portion extending from the exposed portion and being electrically connected to an electrical component. An end of the bonding wire is bonded to the exposed portion, and a first cut portion is formed in the embedded portion.

Abstract: An electronic control unit includes: a sensor board on which a sensor is mounted; a control board configured to control an operation of each electric component, based on a physical quantity detected by the sensor; and a housing configured to accommodate the sensor board and the control board, wherein: in an internal space of the housing, a first accommodation chamber in which the electric component is accommodated, a second accommodation chamber in which the sensor board and the control board are accommodated in a hierarchical state, and a partitioning portion which partitions between the first accommodation chamber and the second accommodation chamber are formed; and the sensor board and the control board are supported by the partitioning portion, and a rib is protrudingly provided on the partitioning portion.

Abstract: A vehicle brake hydraulic pressure control unit in which a pair of regulator valves, four normally open electromagnetic valves, a pair of reservoirs, four normally closed electromagnetic valves, a pair of pumps and a pair of suction valves are provided in a common base unit with the normally open electromagnetic valves and the normally closed electromagnetic valves arranged in parallel with each other. A pair of primary and secondary suction valves are arranged collectively to lie between four normally open electromagnetic valves and four normally closed electromagnetic valves which are arranged in parallel with each other and individually to lie between each set of two ports 24A, 24B; 24C, 24D from each end of four ports 24A, 24B, 24C, 24D.

Abstract: An electronic control unit which includes: a sensor board to which a sensor for detecting a predetermined physical quantity is attached; a control board which controls an operation of an electric part based on the physical quantity detected by the sensor; and a housing which accommodates the sensor board and the control board, wherein the housing has a first room for accommodating the electric part, a second room for accommodating the sensor board and the control hoard in a stacked condition, and a partition portion for separating the first room and the second room from each other, wherein a recess which is opened to the second room is formed in the partition portion, and a sensor accommodating portion for accommodating the sensor is formed using the recess.

Abstract: A base body has flow path configuring portions, has inlet and outlet ports, a central mounting hole 31, a central flow path 51 penetrating the central mounting hole 31, first inner and outer mounting holes 32, 33 disposed upstream side of the central mounting hole 31, second inner and outer mounting holes 34, 35 disposed downstream side of the central mounting hole 31, a third mounting hole 36 disposed below the second outer mounting hole 35, a wheel side sensor mounting hole 46 disposed on an extension of the outlet port 22L between the first inner mounting hole 32 and the second inner mounting hole 34, and a hydraulic pressure source side sensor mounting hole 45 disposed on a center line X of the base body so as to straddle to extend to the flow path configuring portions across the center line X.

Abstract: A vehicle brake hydraulic pressure control unit in which a pair of regulator valves, four normally open electromagnetic valves, a pair of reservoirs, four normally closed electromagnetic valves, a pair of pumps and a pair of suction valves are provided in a common base unit with the normally open electromagnetic valves and the normally closed electromagnetic valves arranged in parallel with each other. A pair of primary and secondary suction valves are arranged collectively to lie between four normally open electromagnetic valves and four normally closed electromagnetic valves which are arranged in parallel with each other and individually to lie between each set of two ports 24A, 24B; 24C, 24D from each end of four ports 24A, 24B, 24C, 24D.

Abstract: A braking system comprises a main pump supplying a fluid pressure to an intermediate circuit section between a master cylinder and a wheel cylinder, a fluid pressure control valve controlling wheel cylinder brake fluid pressure. By driving the pump and controlling the valve, a control unit controls the braking force independently of the driver's brake operation to achieve a vehicle stability control. A relief valve is disposed in a relief circuit bypassing a gate valve between the master cylinder and the wheel cylinder. The relief valve has a movable valve element having an opening pressure receiving portion for receiving a downstream pressure of the gate valve, and a closing pressure receiving portion receiving a fluid pressure in a closing pressure chamber. The closing pressure chamber is separated from the relief circuit, and the pressure in the closing pressure chamber is independent of the pressure in the relief circuit.