SU524723A1 - Hydraulic power steering vehicle - Google Patents

Description

one

The invention relates to the transport industry, in particular to hydraulic power steering of vehicles.

A hydraulic power steering of a vehicle is known, which contains a power cylinder with a rod, a terminating gear rack, kinematically associated with controllable wheels and a worm shaft, interacting axially with a distributor valve, hydraulic lines connected to a pump, hydraulic accumulator, oil tank. and working cavities of the power cylinder.

The disadvantage of such a hydraulic booster is that due to the failure of the pump or the stopping of the engine, the pressure in the system drops sharply. With vehicle transport speeds this can lead to an accident.

The aim of the invention is to improve safety at work.

For this, in the distributor spool, a channel is connected, which connects the hydroaccumulator with the pump discharge line

the extreme positions of the spool, and a check valve is installed in the line connecting the pump to the distributor spool.

The device is designed in such a way that the hydraulic booster from the hydroaccumulator is operated as a result of a significant increase in torque on the steering wheel, in which the pressurized fluid passes from the hydroaccumulator to the working cavities of the power steering.

The drawing shows schematically the proposed power steering, general view.

Claims (2)

The hydraulic booster of the steering of the vehicle contains a spool 1, which is a sleeve, on the outer surface of which there are made separating ski, lapped to the inner walls of the distributor housing 2. Inside the spool, channel 3 is made, which informs the supercharger cavity of the spool chamber with the working cavity of the hydroaccumulator 4 with the additional axis of the spool being moved to one side or the other. The spool 1 is freely fitted on the front end of the screw 5 and can move along its axis. The magnitude of this movement is limited by thrust washers 6 and lamellar springs 7, thrust shields 6 are mounted on the screw shaft 5 together with thrust support 8 and fixed by a nut 9. Moving the spool 1 to overcome the force of the leaf spring 7 is optional. The nut 9 adjusts the axial clearance between the thrust washers 6 and the leaf springs 7, the bushing 6 is supported by the reactive plungers 10, which are pushed by the spring llj which tend to keep the spool 1 in the neutral position. The distributor is connected to the power cylinder 12 by pipelines 13 and 14. During normal operation, the steering hydraulic system and the neutral position of the spool, which corresponds to the linear motion of the tractor, shtokov and bashtok cavity of the power cylinder, are blocked with, and the fluid pumped by the pump 15, by virtue of The fact that the valve 16 is adjusted to a higher pressure than the valve 17, at the beginning, the accumulator 4 fully charges, and the zem. opening the valve 16 goes to drain through channel 18, the annular point in the valve body of the channel 19, When turning the steering wheel, for example, clockwise (turning right), the worm to 5 due to the axial force arising in engagement with the toothed sector 20, moves to the left, overcoming the force of the spring 11, together with the spool 1 by the amount of the gap between the thrust plate 6 and the plate spring 7, the fluid being injected through the channel 21, the annular boring of the spool and the pipeline 13 enters the pinhole of the power cylinder 12, is extruded frompinless cavity, fluid is supplied through pipeline 14, annular bores of the slide valve and spool chamber, and pipe 19 goes to the drain. When the steering wheel is rotated counterclockwise (turning left), the spool 1 is shifted viravo, and the fluid is pumped from the pump 15 through the channel 21, the hollow bore of the spool and the pipeline 14 enters the shaftless cylinder of the power cylinder 12, is displaced from the hydraulic cavity the cylinder 12 is liquid through the pipeline 13, the annular bores of the zootnik and the spool chamber, the pipeline 22 UHOSH1T to drain. The force exerted by the ram is transmitted by the rack 23 to the toothed sector 20, thereby facilitating the rotation of the steered wheels. In the event of a pump failure or a sudden stop of the engine, the force on the steering wheel increases dramatically, and the axial force arising from the E engagement of the worm 5 with the toothed sector 2O increases. This causes an additional displacement of the spool 1 followed by deformation of the lamellar blade 7. This additional axial displacement the spool in one direction or another ensures the coincidence of the channel 3 with the annular grooves in the spool chamber, to which. The pressure of the working cavity of the hydroaccumulator 4 is supplied. The liquid under pressure from the hydroaccumulator 4 through the channel 3 enters the discharge cavity of the sologic chamber. Further distribution of the fluid occurs as described above. The system provides a signaling device 24, which is triggered during the discharge of the hydroaccumulator. Claim 1, A hydraulic power steering of a vehicle, comprising a power cylinder with a rod terminating in a rack, kinematically connected with controllable wheels and a worm shaft, interacting axially with the distributor spool, the hydraulic lines connected to the pump, pump accumulators, the oil tank and the working cavities of the power cylinder, characterized in that, in order to increase safety in operation, the distributor has a channel in the valve spool that informs accumulator with the pressure line of the pump when the extreme positions of the spool 2, amplifier according to claim 1, characterized in that in line connecting the pump with a distributor slide valve, a check valve. - HDfeL M