SU931561A1 - Distributor of hydraulically-assisted vehicle steering gear - Google Patents

Description

axially displaceable chambers.

FIG. 1 shows a distributor, a longitudinal section; Fig.2 section aa in Fig.1.

The distributor includes a spool body 1 with annular bores 2- .. The middle bore 3 is connected to the channel for supplying the working fluid from the pump, and the extreme bores 2 and to the channels for draining the liquid to the drain. In the reactive chambers of the housing 1, the plunger 5B is freely and axially displaced, and the spool 6 is mounted on the central opening of the housing. mechanism 10 with the possibility of axial movement, and screw connection - with the shaft 11 of the drive movement of the spool 6 fixed in the cover 12 for the sake of flax-resistant bearings 13 ..

The shaft has splines and is connected by torsion 1 to the input shaft of the steering mechanism 10. The splined connection is made with a gap 15 which is selected from the condition of obtaining the spool stroke rfbJiHoro.

The inner rings 16 and 17 of the bearing rest on the ends of the plungers 5 The outer ring 18 of the lower bearing rests against the collar of the sleeve 9 and the outer ring 13 of the upper bearing is fixed by a nut 20.

In the cover 21, which serves to adjust the tension of the bearings 13, a complex seal 22 is installed. By drilling 23 and in the housing 1, the cavities 5 and B of the distributor are connected to the drain.

When the spool is in a neutral position, the pumping liquid flows to the middle bore 3 and through bores 2 and 4 to drain, filling the reactive chambers between the plungers 5 and drilling into the body of the pressure cylinder cavity. When the shaft 11 is rotated due to the screw connection, the sleeve 9c is fixed on it by the spool 6 along the splines of the input shaft of the steering mechanism 10 moves in the axial direction.

At the initial moment of displacement, when the pressure in the system is insignificant,

The force on the rim of the steering wheel is mainly created by the torsion head I, which directly acts on the drive shaft 11 of the movement of the slide valve. The screw joint in this case moves only the valve and is practically not loaded.

When the spool 6 is displaced, the value of which is limited by the gap 15 in the spline connection, the access of the working fluid to one of the annular bores 2 and, as well as to one of the cavities of the ram cylinder, is stopped. The working fluid from the pump is fed into the corresponding cavity of the power cylinder, while the opposite cylinder cavity is connected to the drain.

The increase in pressure in the system and, therefore, in the jet chambers provides an increase in the force on the rim of the steering wheel in proportion to the increase in the moment of resistance to rotation.

When the steering wheel is removed from the rim, the torsion wheel I and the plungers 5 return the valve to the neutral position.

When the pump is not running or the booster is not sufficiently effective, a gap 15 is selected in the splined joint of the shaft 11 with the input shaft of the steering mechanism 10, and the force from the steering wheel is directly transmitted through mechanical connections as in a conventional power steering without an amplifier.

invention formula

A hydraulic power steering distributor for a vehicle, comprising a housing with plungers arranged in the jet chambers of the housing, coupled by thrust bearings to a threaded sleeve, kinematically interacting with the drive shaft of moving the spool fixed axially relative to the housing and connected by a splined connection side clearance with a steering shaft, which is characterized by the fact that, in order to increase the reliability of the distributor, it is equipped with rsionom, one end of which is coupled to the drive shaft movement of the spool,

Claims (1)

Claim A distributor of a hydraulic power steering of a vehicle, comprising a housing with plungers located in the reaction chambers of the housing, a spool connected by thrust bearings to a threaded sleeve kinematically interacting with a drive shaft for moving the spool mounted motionless in the axial direction relative to the housing and connected by a spline connection lateral clearance with a steering shaft, characterized in that, in order to increase the reliability of the distributor, it is equipped with a torso oxazolidinone which one end is connected to a drive shaft moving spool, 5 931561 6 and the other with a steering shaft, while the plungers are installed in the reaction chambers with the possibility of movement in the axial direction.