Patent ID: 7896125
Filing Date: 2011-03-01
Classification: B62D,F04B

Abstract:
1. A hydraulic steering device for centre pivot steered vehicles with a centre point steering joint between major ground-engaging components of the vehicles, comprising: at least one hydraulic swiveling motor for producing the steering movement; a hydraulic variable flow pump with reversal of the direction of delivery, the variable flow pump in fluid flow communication with the at least one swiveling motor; the at least one swiveling motor further being a swiveling vane motor that is in the form of a centre pivot steering joint of the centre point-steered vehicle or is arranged in the rotary axis of the centre point steering joint of the vehicle, the at least one swiveling motor having at least one first vane fixed in relation to the first ground-engaging component, and at least one moveable vane fixed in relation to the second ground-engaging component and wherein the at least one moveable vane pivots about the rotary axis with respect to the first ground engaging component wherein two connections of the variable flow pump are connected with two chambers of the swiveling vane motor in a first circuit such that a chance at the adjusting actuator of the variable flow puma causes an inflow to one of the chambers and an outflow from the other chamber; and the variable flow pump driven by a driving mechanism that powers a second hydraulic pump located in a second circuit configured to draw fluid from a reservoir for supplying the second circuit wherein at least one valve permits the flow of fluid from the second circuit to supply the first circuit.