RU2291807C1 - Distributor of vehicle steering hydraulic booster - Google Patents

Abstract

FIELD: transport engineering; steering boosters.

SUBSTANCE: proposed distributor of vehicle steering hydraulic booster has housing with spool arranged in its central hole coupled by thrust bearings with sleeve engaging by spines with steering shaft and by thread, with spool displacement drive shaft connected with steering shaft by means of torsion bar whose working part is arranged in zone of space connected with drain. Blind central channel is made in torsion bar arranged in zone of space connected with working liquid drain, overlapping in length working part of torsion bar and communicating from side of open end face with atmosphere or with signaling device. Signaling device can be made in form of spring-loaded movable and fixed contacts arranged in blind central channel of torsion bar.

EFFECT: improved safety of vehicle control, increased response and simplified design.

2 cl, 3 dwg

Description

The invention relates to the field of transport engineering, in particular to distributors of hydraulic power steering of vehicles.

A known distributor of a hydraulic power steering of a vehicle, comprising a housing with centering springs and plungers located in the reaction chambers of the housing, a spool connected by thrust bearings to a sleeve kinematically interacting with splines with the steering shaft and a thread with a spool drive drive shaft (A.S. USSR No. 559853, IPC B 62 D 5/06, publ. 05.30.1977).

A disadvantage of the known distributor is the low sensitivity due to the increased friction forces in the spool displacement drive caused by overcoming the reactive forces of the centering springs and plungers and the complexity of the design.

Closest to the claimed technical solution is the distributor of a hydraulic power steering of a vehicle, comprising a housing with plungers located in the reaction chambers of the housing, a spool located in its central hole and connected by thrust bearings with a sleeve kinematically interacting with the splines with the steering shaft, and a thread with a drive shaft for moving the spool connected by a torsion bar with a steering shaft (AS USSR No. 931561, IPC B 62 D 5/06, published on 05/30/1982).

A disadvantage of the known dispenser is the lack of sensitivity due to increased friction forces in the drive movement of the spool caused by overcoming jet; the forces of the plungers, the complexity of the design and the insufficient safety of driving in the event of fatigue failure of the working part of the torsion bar.

The objective of the invention is to increase the safety of driving, increasing sensitivity and simplifying the design.

The technical result consists in the possibility of signaling a malfunction of the torsion bar.

The task is achieved due to the fact that in the distributor of the hydraulic power steering of the vehicle, comprising a housing with a spool located in its central hole, connected by thrust bearings to a sleeve that interacts with the splines with the steering shaft, and a thread with a spool displacement drive shaft connected to the steering shaft with the help of a torsion bar, the working part of which is located in the area of the body cavity connected to the drain, in the torsion a blind central channel is made, located connected in the area of the body cavity connected to the discharge of the working fluid, overlapping the length of the working part of the torsion bar and communicating from the side of the open end with the atmosphere or signaling device.

The signaling device can be made in the form of a spring-loaded movable and fixed contacts placed in a blind central channel of the torsion bar.

The claimed distinctive features: communication of the dull central channel of the torsion bar with the atmosphere or signaling device is alternative, since their implementation provides the same technical result - there is an alarm about malfunctions in the torsion bar: or a warning light in the oil tank in case of communication of the blind central channel with the atmosphere , or a signal light in the signaling device when the movable and fixed contacts are closed in case of a message of the deaf central channel with the signaling device.

In contrast to the prototype, in which two centering elements of the spool are used: plungers and a torsion, which create complexity of the design, the claimed device uses only one centering element of the spool - torsion.

In the case of fatigue damage to the torsion, a crack initially forms on its working part, and since the dull central channel and the working part of the torsion are located in the area of the body cavity connected to the drain, the working fluid from the cavity enters this channel and then into the atmosphere, the level of the working fluid at In this case, the oil tank goes down, its signal lamp lights up, informing the driver about the malfunction.

If the torsion is damaged in the case of the connection of the blind central channel to the signaling device under the action of working fluid pressure, the movable and fixed contacts in the signaling device are closed and the signal light in the driver's cab lights up.

Due to the implementation in the torsion of a dull central channel located in the zone of the body cavity connected to the drain and overlapping the working part of the torsion bar, the plungers are eliminated in the inventive distributor and its sensitivity is increased and the structure is simplified.

The invention is illustrated by drawings:

figure 1 shows a longitudinal section of a distributor;

figure 2 is a section aa in figure 1;

figure 3 - connection of the deaf central channel of the torsion bar with a signaling device.

The distributor of the vehicle’s hydraulic power steering contains a housing 1 with three annular grooves 2, 3 and 4. The middle annular groove 3 is connected by a channel 5 for supplying the working fluid from the pump, and the extreme annular grooves 2 and 4 are connected with channels 6 and 7 for the removal of the working fluid to drain. In the central hole of the housing 1, a spool 8 is installed, connected by thrust bearings 9 and 10 with a sleeve 11, which interacts with splines with the steering shaft 12 with the possibility of axial movement, and by a thread with the shaft 13 of the spool drive 8 mounted in the cover 14 on angular contact bearings 15. The shaft 13 of the actuator for moving the spool 8 with splines and with the help of a torsion 16 is connected to the steering shaft 12. The spline connection is made with a gap 17, which is selected from the condition of obtaining a full stroke of the spool 8.

In the torsion bar 16, which represents the only centering element of the spool 8, a blind central channel 18 is made, overlapping the working part along its length and communicating from the open end side with an atmosphere or signaling device including a spring-loaded movable contact 19 and a fixed contact 20 located in the blind central channel 18 from the side of its open end. The deaf central channel 18 and the working part of the torsion 16 are located in the area of the cavity 21 of the housing 1, connected through the cavity 22 and 23, drilling 24 and 25 in the housing 1 with the discharge of the working fluid.

The inner rings 26 and 27 of the thrust bearings 9 and 10 are in contact with the ends of the spool 8, the outer rings 28 and 29 abut against the collar of the sleeve 11 and the lock nut 30, respectively. The torsion bar 16 is fixed relative to the shaft 13 of the spool actuator 8 with a pin 31 installed in the longitudinal drilling 32 A seal 34 is installed in the top cover 33. To connect to the cavities of the ram (not shown), channels 35 and 36 are made in the housing 1.

The distributor of the hydraulic power steering of the vehicle operates as follows.

In the neutral position of the spool 8, which is provided by the torsion 16, the working fluid from the pump flows to the middle annular groove 3 and through the annular grooves 2 and 4 is directed to the drain, filling through the channels 35 and 36 of the cavity of the power cylinder.

When the shaft 13 of the drive for moving the spool 8 is rotated, the torsion bar 16 is twisted and, thanks to the threaded connection, the sleeve 11 with the spool 8 mounted on it moves along the splines of the steering shaft 12 in the axial direction. When the spool 8 is displaced, the size of which is limited by the gap 17 in the spline connection, the access of the working fluid to one of the annular grooves 2 and 4, as well as to one of the cavities of the power cylinder, ceases. The working fluid from the pump is fed into the corresponding cavity of the power cylinder, while the opposite cavity of the cylinder is connected to the drain. An increase in the twist angle of the torsion bar 16 with increasing pressure in the system provides an increase in the effort on the rim of the steering wheel in proportion to an increase in the moment of resistance to rotation of the steered wheels. When the effort is removed from the steering wheel rim (not shown), torsion bar 16 returns spool 8 to the neutral position.

When the pump is idle or the hydraulic booster is not efficient enough, a gap 17 is selected in the spline connection of the shaft 13 of the spool actuator 8 with the steering shaft 12 and the force from the steering wheel is transmitted through mechanical connections, as in steering without a hydraulic booster.

In case of fatigue damage to the torsion 16, a crack initially forms on its working part and the cavity 21 is connected to the deaf central channel 18 and the atmosphere, while the level of the working fluid in the oil tank decreases, its warning light lights up, informing the driver about the malfunction of the torsion 16 and, therefore, distributor.

When the detector is installed in the blind central channel 18 in case of fatigue damage to the torsion 16, the cavity 21 is connected to the blind central channel 18, under the action of the working fluid pressure in the blind central channel 18, the spring-loaded movable contact 19 comes into contact with the stationary contact 20, the signal lamp of the indicator lights up, informing the driver about the malfunction of the torsion bar 16.

Thus, the driver receives information at the initial moment of fatigue damage to the torsion bar and will take measures to ensure the safety of driving.

Claims (2)

1. The distributor of the hydraulic power steering of the vehicle, comprising a housing with a spool located in its central hole, connected by thrust bearings to a sleeve that interacts with splines with the steering shaft, and a thread - with a spool drive drive shaft connected to the steering shaft by torsion, the working part of which is located in the zone of the cavity connected to the drain, characterized in that in the torsion there is a blind central channel located in the zone of the cavity connected to draining working fluid overlapping length of the working portion of the torsion bar and communicating with the open end side to atmosphere or signaling. 2. The distributor of the hydraulic power steering of the vehicle according to claim 1, characterized in that the signaling device is made in the form of a spring-loaded movable and fixed contacts located in the blind central channel of the torsion bar.

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