JPS6034958U - power steering device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

Fig. 1 is a hydraulic circuit diagram showing an embodiment of the power steering device according to the present invention, Fig. 2 is a longitudinal side view of an oil passage switching valve,
Figure 3 is a lower cross-sectional plan view, Figure 4 is an upper cross-sectional view, Figure 5 is a vertical cross-sectional side view of the changeover valve, pressure control valve, and solenoid valve, and Figure 6 is an oil passage switching diagram. Figure 7 is a longitudinal and side view of the valve and pressure control valve, Figure 7 is a vertical and side view of the oil passage switching valve and change-over valve, and Figure 8 I is the change-over valve, pressure control valve, and solenoid valve. Fig. 8 is an end view of the solenoid valve, Fig. 9 is an enlarged longitudinal sectional side view of the pressure control valve, Fig. 10 is an enlarged longitudinal sectional side view of the same, Fig. 11 is the pressure control valve. An enlarged plan view of the sleeve of the valve, FIG. 12 is an enlarged longitudinal and side view thereof, FIG. 13 is an enlarged longitudinal and other side view thereof, and FIG. 14 is an arrow direction XVI-XV in FIG.
A cross-sectional plan view along the T line, Fig. 15 is the arrow view X - in Fig. 13.
A cross-sectional plan view along the X line, Figure 16 is the arrow view XV in Figure 12.
FIG. 17 is a cross-sectional plan view taken along line I-XVI, FIG. 17 is a cross-sectional plan view taken along line X--X in FIG. 13, FIG. 18 is a side view of the sleeve of the pressure control valve, and FIG. 20 is a side view showing the spool, FIG. 21 is an enlarged longitudinal sectional side view of the sleeve and spool of the solenoid valve, and FIG. 22 is a cross-sectional plan view of the filter. Figure 23 is its front view, Figures 2-4 are cross-sectional plan views showing its installed state, Figure 25 is a circuit diagram of the control device, and Figure 26 is the output oil pressure (pump discharge pressure) and torsion of the oil passage switching valve. An explanatory diagram showing the relationship between the torsion angle of the bar (relative angle between the spool and the sleeve of the oil passage switching valve),
Fig. 27 is an explanatory diagram showing the relationship between output oil pressure and handle torque, Fig. 28 is an explanatory diagram showing the relationship between reaction force plunger side chamber oil pressure (handle torque) and torsion bar torsion angle, and Fig. 29 is an explanatory diagram showing the relationship between reaction force plunger side chamber oil pressure (handle torque) and An explanatory diagram showing the relationship between the hydraulic pressure of the force plunger side chamber and the output hydraulic pressure, Figure 30 is an explanatory diagram showing the relationship between the handle torque and the torsion angle of the torsion bar, and Figure 31 is an explanatory diagram showing the relationship between the flow rate at the control system inlet side and the control system FIG. 32 is an explanatory diagram showing the flow rate of each internal part, and FIG. 32 is an explanatory diagram of the operation of the present invention. 1...Oil pump, 2...Oil passage switching valve, 3...
Power cylinder, 4...Oil tank, 5...Reaction force piston, 7a...High pressure oil path, ? by 7cy
7dt 7d2.6...High pressure oil passage, oil passage extending from 7a to reaction force piston 5, 7e...Parallel oil passage, 8a, 8
b...Low pressure oil path, 11...Change over valve, 12...Pressure control valve, 13...Flow rate control valve, a
, b, C, d. e...orifice.

Claims (1)

[Scope of utility model registration request] The movement of the handle is transmitted to the oil passage switching valve via the torsion bar to switch between the high pressure oil passage extending from the oil pump to the oil passage switching valve and the low pressure oil passage extending from the oil passage switching valve to the oil tank. In a power steering device that operates a torsion bar in a predetermined steering direction and guides a portion of the hydraulic oil flowing through the high-pressure oil passage to a reaction force piston to regulate torsion of the torsion bar, A parallel oil passage branched from the middle of the parallel oil passage, an orifice provided on one side of the parallel oil passage, and a flow control valve that discharges hydraulic oil from the parallel oil passage proportionally depending on the vehicle speed. There is an orifice on the downstream side of the flow control valve that generates a pilot pressure according to the flow rate, and the pilot pressure is activated to control the oil pressure in the oil passage to the reaction force piston when the vehicle speed is above a certain level and the steering angular velocity exceeds a predetermined value. A power steering device characterized by comprising a pressure control valve that controls the pressure to increase according to vehicle speed.