Distribution device, particularly for a servo-steering system of an automotive vehicle

Abstract

Abstract 1. A hydraulic distribution device for a servo mechanism, in particular for a servo steering system, of the type comprising a pair of cylindrical, coaxial fluid distribution elements (14, 15) adapted to perform a limited relative rotation about their common axis in either direction from a relative neutral position, said distribution elements comprising openings and cavities defining a fluid circuit (26) connectable between a fluid source (27) and a fluid reservoir (28), said circuit comprising a pair of distribution branches (56, 57) connected in parallel and provided with passages (60, 61, 62, 63, 64) of variable cross-section defined in the cylindrical surface of contact of said distribution elements and comprising in each branch two types of passages having opposite opening senses in either direction of relative rotation from said relative neutral position, passages of the two types ("a", "b") communicating with a work pressure connection (37, 39) of the considered branch, characterized in that each branch is provided with at least one high-pressure passage (64a, 64b) of variable cross-section, the complete closing of which for a corresponding direction of relative rotation is determined by an angle of relative rotation at which all the other passages of the same type are closed, in that this high-pressure passage is connected in series with a flow restriction (65), and in that the assembly comprised of this passage and said restriction is connected between connection means (38) of said fluid source and the pressure connection of said branch.

Inventors

• 👤 Gilbert Kervagoret

Bibliographic Details