Ratchet action vehicle steering system has a housing coupling interface

A rack mechanism (MD) of a vehicle steering system (SD) comprises a casing (CM), on the one hand housing at least part of a mechanism that controls the pivoting of wheels of the system (SD) and, on the other hand, comprising on an external face (FE) at least two protrusions (PR) each equipped with a through-hole (TT) defined in a chosen direction and able to allow through a coupling pin of a rack manipulator.