Control device for hydrostatic steering means or the like
AssigneeDanfoss A/S
InventorErik C. Jorgensen
Life of this patent
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Abstract
The invention relates to a control device for a hydrostatic steering motor of the type having a slide valve arrangement in which inner and outer sleeves are rotatable relative to each other to both sides of a neutral position through a limited small angle. A bypass throttle between the pump and tank connections of the control device has a dual throttle feature which permits the throttle to be closed after only a small amount of turning away from the neutral position and operates with a reduced amount of noise generated during the turning operations for the same total resistance.
Claims6
A control device for a hydrostatic steering motor, comprising, supply and return pump and tank connections for said device, a slide valve arrangement in which inner and outer slide element sleeves are rotatable relative to each other to both sides of a neutral position through a limited small angle, said sleeves mutually forming controlled supply and return passages connected to said motor having supply and return throttles which are closed when said sleeves are in a neutral position, bypass throttle means between said pump and tank connections being open when said sleeves are in a neutral position, said bypass throttle means having two circumferentially offset throttle positions formed by two circumferentially offset axially extending bypass throttle grooves in one of said elements and a bridging recess in the other of said elements.
Dependencies are inferred from the claim text.