JPH01136702U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a diagram of a conventional active suspension, Fig. 2 is a specific sectional view of the directional flow control valve shown in Fig. 1, and Fig. 3 shows the relationship between current value and flow rate of the conventional directional flow control valve. Figure 4 is a sectional view of a conventional pressure compensation valve, Figure 5 is a diagram when the pressure compensation valve shown in Figure 4 is installed in the active suspension shown in Figure 1, and Figure 6 is a single acting type. FIG. 7 is a diagram of the embodiment of the present invention, and FIG. 8 is a sectional view of a specific example of the directional flow control valve shown in FIG. 7. DESCRIPTION OF SYMBOLS 1... Single-acting hydraulic cylinder, 2... Directional flow control valve, 3... Hydraulic pump, 4... Tank, 5... Valve housing, 6
...Spool, 7,8...Spring, 9,10...Proportional solenoid, 9a, 10a...Movable member, 11...Pump port, 12...First cylinder port, 13...Tank port, 14...Second cylinder port, 15...Second cylinder port 1 passage, 16...Second passage, 20...First flow rate control orifice, 24...Second flow rate control orifice, 25
...first compensator spool, 30...second compensator spool.

Claims (1)

[Scope of utility model registration request] Both ends of a spool, which is slidably provided in the valve housing, are held in a neutral position by springing both ends of the spool, and movable members of a proportional solenoid are connected to each end of the spool, and the spool is connected to an electric current to the proportional solenoid. In a valve housing that controls the flow rate and flow of fluid into a single-acting hydraulic cylinder of an active suspension by sliding a distance depending on the magnitude of a signal, a hydraulic pump is attached to the valve housing. A pump port that is connected to the tank, a tank port that is connected to the tank, and two first and second cylinder ports that are connected to the hydraulic cylinder are formed in the spool. A first passageway connected to the first cylinder port via a first flow control orifice formed by the valve housing and the spool, and a first passage connecting the second cylinder port to the valve housing and the spool when the spool slides in the opposite direction. a second passageway connected to the tank port via a second flow rate control orifice formed by the flow control orifice; A first compensator spool is provided in the second passage to change the pressure difference and control the differential pressure to be as constant as possible, and the second passage is operated by the pressure difference before and after the second flow control orifice to control the area of the second passage. A directional flow control valve for an active suspension, characterized in that a second compensator spool is provided for controlling the differential pressure to be as constant as possible by changing the pressure difference.