Abstract: A vehicle cooling system includes a circulation flow path section which has a first flow path section and a second flow path section, and a solenoid valve which can switch between an open state in which the first flow path section and the second flow path section are connected and a closed state in which the first flow path section and the second flow path section are blocked. The circulation flow path section includes a valve body accommodating section configured to include a first accommodating section and a second accommodating section which connects the first flow path section and the second flow path section in the open state, and a connection flow path section whose one end is connected to the first flow path section. The other end of the connection flow path section opens to the first accommodating section.

Abstract: An electromagnetic valve and a flow path device are provided, and the electromagnetic valve includes: a main body, a tube member and a connection flow path portion. A movable portion has a shaft portion, a valve body and a partitioning portion. The partitioning portion is located on the one side in the axial direction beyond the valve body and partitions the inner portion of the tube member into a first accommodation portion and a second accommodation portion. The second flow path portion is connected to the second accommodation portion in the opened state. The connection flow path portion is provided at the movable portion and connects the first flow path portion to the first accommodation portion in the closed state. The first accommodation portion is able to accommodate a fluid flowing through the first flow path portion and is disconnected from the second flow path portion in the closed state.

Abstract: A vehicle cooling system includes a circulation flow path section which has a first flow path section and a second flow path section, and a solenoid valve which can switch between an open state in which the first flow path section and the second flow path section are connected and a closed state in which the first flow path section and the second flow path section are blocked. The circulation flow path section includes a valve body accommodating section configured to include a first accommodating section and a second accommodating section which connects the first flow path section and the second flow path section in the open state, and a connection flow path section whose one end is connected to the first flow path section. The other end of the connection flow path section opens to the first accommodating section.

Abstract: Disclosed is a hydraulic control module that can be downsized. The hydraulic control module includes an upper control valve, a lower control valve, and a wiring plate. The upper and lower control valves each include an oil path having a groove portion. A sandwich structure is employed so that the wiring plate is sandwiched between the upper and lower control valves. The wiring plate has a groove portion or a through-hole that is in communication with the at least one of the groove portion of the upper control valve and the groove portion of the lower control valve.

Abstract: A torque is transmitted between a fluid pressure pump driven together with drive of a vehicle, and a fluid pressure motor that rotates together with driven wheels. The fluid pressure motor has two ports, and rotates in accordance with the direction of fluid supply to the ports. Fluid is circulated from one port to the other according to the input of rotation torque from the driven wheels. A high pressure flowpath connected to the pump outlet, and a low pressure flowpath connected to the pump inlet, are connected to these ports, and the connection direction is reversed when the rotation direction of the drive wheels is reversed. The low pressure flowpath is therefore always at low pressure regardless of the rotation direction of the drive wheels, and by controlling the pump supply flowrate so as not to exceed a predetermined value, torque is not transmitted when the vehicle is running at high speed.

Abstract: A working fluid circuit for an active suspension control system for an automotive vehicle comprises a pressure source unit which provides pressurized working fluid to actuators, associated with wheels respectively, which are operable to suppress attitude change of a vehicle body, pressure control valves associated with the actuators respectively, and check valves located in a by-pass from an output port to a supply port of the pressure control valve, the supply port communicating with the pressure source through a supply line to which the working fluid is supplied from the pressure source, the output port communicating with the actuator through an output line for outputting the working fluid adjusted at a preselected controlled level to the actuator.

Abstract: A pressure control valve for adjusting a controlled pressure supplied to an actuator includes first and second valves. The first valve serves to modify a pressure level of a working fluid supplied from a fluid pressure source to a preselected level and provides it to the actuator. The second valve is responsive to a control signal commanding elevation or reduction in the controlled pressure from a controller to adjust a supply pressure level from the fluid pressure source to provide a pilot pressure, elevated or reduced to a preselected level, to the first valve for activating same. When elevating or reducing the pilot pressure, the second valve decreases the supply pressure level from the fluid pressure source by a preselected degree, for balancing a flow gain when elevating the pilot pressure with that when reducing the pilot pressure, for providing uniform response for elevation and reduction of the controlled pressure to the actuator.

Abstract: An actively controlled automotive suspension system comprises a hydraulic cylinder disposed between a vehicle body and a suspension member pivotably mounted on the vehicle body, a pressurized fluid source connected to the hydraulic cylinder, a pressure accumulator connected to the hydraulic cylinder for absorbing pressure fluctuation in the hydraulic cylinder, a variable throttling orifice, interposed between the hydraulic cylinder and the accumulator, for variably restricting fluid flow, a pressure control valve for adjusting fluid pressure in the hydraulic cylinder, sensors for monitoring state of a vehicular attitude change, and a controller associated with both of the pressure control valve and the variable throttling orifice for controlling magnitude of fluid pressure in the hydraulic and a throttling ratio of the throttling orifice.

Abstract: An active suspension system is provided a timing control valve in a supply line. The timing control valve is so designed as to provide a predetermined magnitude of delay in building up line pressure upon initiation of suspension control operation. A flow restriction means is further provided in parallel relationship to the timing control valve for permitting fluid flow therethrough in limited flow rate so that sudden increasing of the line pressure in the supply line can be successfully prevented.

Abstract: An active suspension system includes a hydraulic circuit associated with a pressure control valve for adjusting fluid pressure in a working chamber of an active cylinder. A variable orifice is provided between a control portion of the pressure control valve and the working chamber. The variable orifice is operated to provide a first full path area while a line pressure in a supply line for feeding pressurized fluid to said pressure control valve is higher than a predetermined pressure level and a second restricted path area when the line pressure is lower that the predetermined level.

Abstract: A pressure control valve unit to be employed in an active suspension system includes a valve member movable between a pressure increasing mode position, a pressure decreasing mode position and a pressure holding mode position for adjusting fluid pressure in a working chamber of an active cylinder disposed between a vehicular body and a suspension member rotatably supporting a road wheel. The valve member is further movable to a pressure relieving position in response to a pressure in the working chamber higher than a predetermined value. The valve member at the pressure relieving position establishes fluid communication between the working chamber and a drain line for draining pressurized fluid in the working chamber at a draining rate higher than that in said pressure decreasing mode position.

Abstract: A proportioning valve assembly has a supply port through which a pressurized working fluid is supplied, a drain port through which a pressurized working fluid is drained, and a control port connected to a working chamber defined in a hydraulic cylinder disposed between a vehicular body and a suspension member rotatably supporting a vehicular wheel. The proportioning valve assembly further includes a valve member for adjusting working fluid pressure to be supplied to the working chamber via the control port. A flow restricting orifice is provided in the proportioning valve assembly. The flow restricting orifice employed is designed to provide variable flow restriction depending upon working fluid condition and/or the direction for achieving stabilization of pilot pressure or road shock absorption.

Abstract: A hydraulic circuit for an active suspension system employs a pressure accumulator connected to a drain line at an orientation upstream of a pilot operated operational one-way check valve. The pressure accumulator absorbs back pressure generated in the drain line due to flow resistance in the drain line.

Abstract: A proportioning valve assembly employs an electromagnetic acuator, such as a proportioning solenoid, associated with a driver circuit. The driver circuit is provided a lead phase circuit for providing a lead phase in supplying a supply current for controlling the valve position of the proportioning valve. Providing appropriate lead time reduces necessity of high gain in attitude change suppression mode operation. Therefore, the response characteristics in pressure adjustment in the shock absorbing mode operation, can be prevented from falling an excessive level.