VEHICLE HYDRAULIC STEERING BOOSTER Russian patent published in 2009 - IPC B62D5/09 

FIELD: transport.

SUBSTANCE: booster includes a housing comprising a control device with pressure, drain and cylinder lines for connection to hydraulic actuator and control lines for connection with hydraulic steering. It includes two similar three-position continuous booster spools connected on one end to the control lines and fitted with four throttles controlled in accordance with spool travel. In throttle inoperative positions throttle inputs and outputs are locked. The booster is made in the form of a single unit, one side of which is a counterpart for mating face of hydraulic steering supply lines. The other side has connection openings for external hydraulic steering lines. The single unit has two through holes made at right angles to the counterpart surface to screw the single unit to the mating surface of the hydraulic steering. Two similar spools are mounted in parallel within the single unit housing. Spool passages and distributing edges of these passages within the single unit housing form four throttles controlled in accordance with spool travel, and each of the throttles is made in the form of one or more radial openings located in a single plane perpendicular to the longitudinal spool axis. The first and second throttles are made in the form of twin openings located in two parallel planes, between which there is a cylinder passage with two distributing edges, further the third throttle is located, which interacts with the pressure line distributing edge, and the fourth throttle, which interacts with the drain line distributing edge.

EFFECT: amplification of flow coming from the hydraulic steering to the hydraulic actuator, and flow division when fluid is drained from the hydraulic actuator.

3 dwg