JPS6225266U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a hydraulic circuit diagram of an embodiment of the power steering device according to the present invention, Fig. 2 is a longitudinal cross-sectional side view of the oil passage switching valve and pressure control valve portion, and Fig. 3 is the oil passage switching valve and pressure control valve. Fig. 4 is a vertical sectional side view of the control valve section when the control valve is stopped, Fig. 4 is a longitudinal sectional side view of the oil passage switching valve and pressure control valve section when the valve is running, and Fig. 5 is a cross sectional view of the pressure control valve and reaction piston section. The plan view, Figure 6 is a cross-sectional plan view along the arrow line in Figure 7, of the import filter.
The figure is a side view of the same import filter, Figure 8 is an enlarged perspective view of the same import filter, Figure 9 is a vertical side view of the channel provided on the control land, and Figure 10 is
The figure is a cross-sectional plan view showing an example of the import-side orifice, FIG. 11 is a cross-sectional plan view showing other examples of the same import-side orifice, FIG. 12 is a vertical cross-sectional side view showing each example of the return-side orifice, and FIG. 13 14 is a longitudinal side view showing another example of the return side orifice, FIG. 14 is a longitudinal side view showing another example of the differential pressure section of the pressure control valve, FIG. 15 is a system diagram of the control device, and FIG. 16 is an explanatory diagram of hydraulic pressure that changes depending on the angle of the channel installed on the control land - input characteristics, Part 1
Figure 7 is an explanatory diagram of oil pressure-input characteristics that vary depending on the hole diameter of the import orifice. Fig. 19 is an explanatory diagram showing the relationship between the solenoid plunger stroke and axial force, Fig. 20 is an explanatory diagram showing the relationship between vehicle speed and solenoid current, and Fig. 21 is an explanatory diagram showing the input torque-oil pump discharge pressure characteristics. It is a diagram. 1... Oil pump, 2... Oil passage switching valve, 2a... Steering wheel, 3... Power cylinder, 4...
Oil tank, 5... Reaction piston, 7a... High pressure oil path, 7b, 7c, 7d, 7e... Control oil path, 8a,
8b...Low pressure oil path, 11...Pressure control valve, 12...
Solenoid, 13... Orifice, 20a... Hull housing, 21... Input shaft, 22... Torsion bar, 24a... Output shaft, 41... Control groove, 41a... Chamfer.

Claims (1)

[Scope of utility model registration request] an input shaft connected to the steering wheel;
A torsion bar that transmits the rotation of the input shaft to the output shaft, a power cylinder connected to the output shaft, and an oil path that switches the oil path to the power cylinder according to the rotation angle difference between the input shaft and the output shaft. a switching valve; a high-pressure oil passage that supplies hydraulic oil discharged from the oil pump to the power cylinder via the oil passage switching valve; and a high-pressure oil passage that supplies hydraulic oil from the power cylinder to the oil tank via the oil passage switching valve. A low-pressure oil path to return, a reaction piston that applies a regulating force between the input shaft and the output shaft to limit the difference in rotation angle of each shaft, and a reaction piston from the middle of the high-pressure oil path to the reaction piston. an extended control oil passage; a pressure control valve that controls the oil pressure of the control oil passage extending to the reaction piston to a predetermined maximum pressure or less; and the control oil between the pressure control valve and the reaction piston. A power steering system comprising: a return-side orifice that communicates a passage with the low-pressure oil passage; and a solenoid that operates the pressure control valve via a plunger that generates an axial force that changes depending on vehicle speed and is approximately constant at each vehicle speed. In the device, a chamfer is provided around the entire circumference of the control land of the pressure control valve to allow hydraulic oil to slowly flow from the import side of the control oil passage into the control groove provided on the outer peripheral surface of the pressure control valve. A distinctive power steering device.