Device for hydraulically assisted steering
AssigneeSociete Anonyme D.B.A.
InventorGilbert Kervagoret
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Abstract
A device for hydraulically assisted steering of a motor vehicle, comprising a steering control member extended by a sleeve, a rotor and a torsion-bar connecting the rotor and the steering control member; the sleeve includes a first group of two pairs of passage means and the rotor includes a second group of two pairs of passage means each passage means of said second group being shaped such that it can communicate with two passage means belonging to two different pairs of said first group, a source of high pressure and a drain being permanently connected to a pair of passage means of one group, respectively, and the edges of passage means of at least one group, directed along the axis of the sleeve, having a non linear profile defined as a function of the characteristic .DELTA.p=f(.theta.) desired.
Claims9
A device for hydraulically assisted steering of a motor vehicle comprising a steering control member (110) extended by a regulator sleeve (120), a rotor (126) of generally tubular form arranged inside the sleeve (120), a torsion-bar (134) housed inside the rotor and having one end fixed to the rotor and the other end fixed to the steering control member and a hydraulic circuit for generating a control quantity in response to an angular displacement imposed upon the rotor, characterized by the fact that the regulator sleeve (120) includes a first group of two pairs of diametrically opposed passage means (161, 163), the pairs being offset axially and angularly, the rotor (126) includes a second group of two pairs of passage means (165, 167), each passage means (165 or 167) of said second group being shaped such that it can communicate with two passage means (161, 163) belonging to two different pairs of said first group, a source of high pressure (HP) and a drain (179, 160) being permanently connected to a pair of passage means (165, 167) of one group, respectively, the arrangement being such that an angular displacement .theta. of the rotor (126) causes an unbalance .DELTA.p between the respective pressures prevailing in the pairs of passage means (161, 163) of the other group, and the edges of passage means (161, 163) of the first group directed along the axis of the sleeve have a non-rectilinear profile defined as a function of the characteristic .DELTA.p=f (.theta.).
A device for hydraulically assisted steering of a motor vehicle comprising a steering control member extended by a regulator sleeve, a rotor of generally tubular form arranged inside the sleeve, a torsion-bar housed inside the rotor and having one end fixed to the rotor and the other end fixed to the steering control member and a hydraulic circuit for generating a control quantity in response to an angular displacement imposed upon the rotor, characterized by the fact that the regulator sleeve includes a first group of two pairs of diametrically opposed passage means, the pairs being offset axially and angularly, that the rotor includes a second group of two pairs of passage means, each passage means of said second group being shaped such that it can communicate with two passage means belonging to two different pairs of said first group, a source of high pressure and a drain being permanently connected to a pair of passage means of one group, respectively, the arrangement being such that an angular displacement .theta. of the rotor causes an unbalance .DELTA.p between the respective pressures prevailing in the pairs of passage means of the other group, and that the edges of passage means of at least one group directed along the axis of the sleeve have a non-rectilinear profile defined as a function of the characteristic .DELTA.p=f (.theta.), the profile defining leading sections on the axial edges of each passage means, and the leading sections approaching each other.
Dependencies are inferred from the claim text.