SU818944A1 - Wheeled vehicle hydraulic steering system - Google Patents

Description

Neither the hydraulic lines 20 and 21. On the side opposite to the action of the spring 22, the end cavity of the switching spool is connected to the input hydroline 12 of the metering pump and the hydraulic line 23.

The system also has a check valve 24, safety valves 25 and 26. Hydroline 27 communicates the hydraulic lines 7 and 10 in the middle position of the spool 8, hydroline 28 connects the hydraulic line 12 to the drain hydraulic line 29 in the absence of steering wheel rotation. The switching valve 14 is provided with a handle with a lock 30.

The hydraulic system works as follows.

In the manual control mode, the working fluid from the hydraulic pump 1 flows through the hydraulic lines I, 4, 7, 27 and 10 to the hydraulic line 12, then, passing through the hydraulic line 28 of the metering pump, passes through the drain hydraulic line 29 to the hydraulic tank 2. The cavities of the power cylinder 15 are locked on the automatic control spool valve 8.

When the vehicle’s steering wheel is rotated, the working fluid from the metering pump is directed to one of the hydraulic lines 18 or 19, depending on the chosen direction of rotation, for example, 18, while the other hydrolines (19) communicate with the drain hydraulic lines 29 and the hydraulic tank 2. the metering pump increases the pressure by moving the switching spool 14 in the direction of compression of the spring 22, while the hydraulic lines 18 and 19 communicate respectively with the hydraulic lines 16 and 17 of the cylinder, ensuring the piston moves in the cylinder, and the investigator on and turn wheels actuated in a predetermined direction.

In automatic control mode with de-energized control magnets 9, the circulation of the working fluid is carried out as described above.

When one of the magnets is turned on, the automatic control valve 8 moves to one of the extreme positions, while the working fluid from the hydraulic pump 1 through the throttle 6, hydraulic line 7 and one of the hydraulic lines 20 or 21, for example 20, communicates with the cavity of the cylinder 15, opposite the cylinder cavity of the hydroline MIs 17, 21, 10, 12, 28 and 29 communicate with the reservoir.

If it is necessary to manually adjust the direction of movement in automatic control, it is enough to turn the steering wheel in the required direction. At the same time, due to the increase in pressure in the inlet hydroline 12 of the metering pump and the associated hydraulic line 23, the switching spool will move, disabling the automatic control of the automatic control spool line from the hydraulic line of the cylinder and together with each other, hydrolines 18 and

19, the metering pump communicates with the sleeves 16 and 17 respectively, ensuring the steering wheels to rotate. The communication between the hydraulic lines 20 and 21 at the time of manual adjustment eliminates the excessive pressure increase in the system, preventing the safety valve 26 from tripping. During long-term steering operation without using the automatic control mode or in the absence of supply of working fluid from the hydraulic pump 1, the slide valve 14 is set using the handle weave with lock 30

to the position in which the automatic control valve 8 is switched off by the grooves of the switching valve, while the cavities of the power cylinder 16 and 18, 17, 19 communicate with the cavities of the metering pump 13.

When driving a vehicle with an inactive engine, for example, when towing it with another vehicle, there is no supply of working fluid from the hydraulic pump 1, the switching valve is set with the handle with the lock 30 in the position described above. The supply of working fluid to the cavity of the cylinder is carried out by a dosing pump,

which in this case operates in a non-boosting mode as a pump driven by the force applied to the steering wheel. The working fluid in this case enters the inlet hydraulic line 12 of the metering pump from the drain hydraulic line 29 through the check valve 24.

Claims (3)

1. Hydraulic steering system of a wheeled vehicle, comprising a manual control dosing pump, kinematically connected to the steering wheel and hydraulically connected via inlet and outlet hydraulic lines to the hydraulic pump and tank, and through working hydraulic lines to the on-off switching spool hydraulically communicated with the automatic slide valve control and power cylinder, hydraulic pump driven by an engine, connected by a suction hydraulic line to a hydraulic tank, and pressure hydraulic line with an automatic control spool, the switching valve being spring-loaded from one end, characterized in that, in order to increase the reliability of control and allow manual adjustment , the end cavity of the switching spool on the side opposite to the spring action is connected to the input hydroline of the metering pump, the switching spool is made with An analog for communicating the hydraulic lines connecting the specified spool to the automatic control spool, in the position of the switching spool corresponding to the manual control. 2. The hydraulic system of Claim 1, characterized in that it is equipped with a flow controller installed in the pump discharge line, the drain valve hydroline being connected to the inlet pump dosing pump. 3. The hydraulic system for PP. 1 and 2, characterized in that the switching valve is provided with a handle with a lock. Sources of information taken into account in the examination 1. Journal of Germany Hydraulik und Pneumatic, No. 8-73, p. 20, Fig. eight.