JPH0224704U - - Google Patents

Description

[Brief explanation of drawings]

1 to 5 are diagrams showing an embodiment of a variable damping force type hydraulic shock absorber according to the first invention, and FIG. 1 is a sectional view showing the overall structure of the shock absorber;
Fig. 2 is a sectional view showing the structure of the main parts near the piston, Fig. 3 is an overall configuration diagram of the system, Fig. 4 is a circuit diagram of a part of it, and Fig. 5 is a diagram for explaining its operation. 6 and 7 are diagrams showing an embodiment of the variable damping force type hydraulic shock absorber according to the second invention, FIG. 6 is a sectional view showing the main part structure near the piston, and FIG. FIG. 2 is a sectional view showing the configuration of main parts near the bottom valve. 1,201...Shock absorber, 3,20
3... Cylinder, 4,204... Piston rod, 5,207... Piston, 14,205... Extension side liquid chamber, 15,206... Pressure side liquid chamber, 45, 21
1...Hollow part, 46-48, 212-214...
Communication hole, 51, 217...Valve body, 52,
218... Upper liquid chamber, 53, 219... Lower liquid chamber, 54, 220... Extension side flow path, 55, 221...
Pressure side flow path, 56, 222... Growth side disc valve, 57, 223... Pressure side disc valve, 58...
...Slider, 59,224...Valve core, 80
...First piezoelectric element (second hydraulic pressure sensor), 90
...Second piezoelectric element (first hydraulic pressure sensor), 10
0... Control unit, 230... First piezoelectric element, 260... Bottom valve, 263...
Pressure side disc valve, 264...Pressure side flow path, 26
9... Valve seat, 270... Second piezoelectric element.

Claims (1)

[Claims for Utility Model Registration] (1) A cylinder filled with hydraulic fluid, provided at the tip of a piston rod inserted from one end of the cylinder, and whose volume is reduced during the extension stroke of a hydraulic shock absorber inside the cylinder. a piston defined between a rebound-side liquid chamber and a compression-side liquid chamber whose volume is reduced during the compression-side stroke; a rebound-side flow path for causing the working fluid in the rebound-side liquid chamber to flow out from the rebound-side liquid chamber during the rebound stroke; A compression side flow path through which the working fluid in the compression side liquid chamber flows out from the pressure side liquid chamber during the compression side stroke, and a rebound side disk valve that is provided in each of the expansion side flow path and the compression side flow path and generates a damping force according to the bending rigidity thereof. and a compression side disc valve, first and second piezoelectric elements that change the bending rigidity of the compression side disc valve and the compression side disc valve to change the damping force generated by each of the compression side disc valve and the compression side disc valve, and a compression side disc valve. a first hydraulic pressure sensor that detects the hydraulic pressure of the liquid chamber and the pressure side liquid chamber; a second hydraulic pressure sensor that detects the hydraulic pressure of either one of the expansion side liquid chamber and the pressure side liquid chamber; A variable damping force type hydraulic shock absorber, characterized in that the operating direction of the hydraulic pressure shock absorber is determined based on the detection signal from the second hydraulic pressure side sensor, and drive control of the first and second piezoelectric elements is performed. (2) A cylinder filled with hydraulic fluid, a rebound liquid chamber provided at the tip of a piston rod inserted from one end of the cylinder, whose volume decreases during the rebound stroke of the hydraulic shock absorber, and its pressure side. A piston is defined in a compression side liquid chamber whose volume is reduced during the stroke, a rebound side flow path through which the hydraulic fluid in the expansion side liquid chamber flows out from the expansion side liquid chamber during the expansion stroke, and a piston that allows the hydraulic fluid in the compression side liquid chamber to flow into the compression side. a compression side flow path that causes the liquid to flow out from the pressure side liquid chamber during stroke; a growth side disc valve and a compression side disc valve that are provided in the expansion side flow path and the compression side flow path, respectively, and generate a damping force according to the bending rigidity thereof; By changing the bending rigidity of the disc valve and the compression side disc valve, the damping force generated by each of the rebound side disc valve and the compression side disc valve is changed, and the damping force of the rebound side liquid chamber or the compression side liquid chamber input through each disk valve is changed. First and second piezoelectric elements that generate an output signal according to liquid pressure, and a liquid that is controlled by the other piezoelectric element from the back side of either of the first and second piezoelectric elements. The hydraulic pressure in the chamber is applied, the piezoelectric element is formed to generate an output signal according to this hydraulic pressure, and the hydraulic pressure signal from the first and second piezoelectric elements determines the operating direction of the hydraulic shock absorber. A variable damping force type hydraulic shock absorber characterized in that the damping force variable type hydraulic pressure shock absorber is characterized in that the first and second piezoelectric elements are drive-controlled based on the determination.