Use of a stepped shrink-fit ring to assemble a steering assist motor in a steering case

Abstract

An assembly method in which an assembly ring is force-fitted between a first part and a second part such as to create: a tightening contact between the first part and the inner face of the ring, by means of plastic deformation of the ring, said tightening contact occupying a first interference zone; and a tightening contact between the second part and the outer face of the ring, said tightening contact occupying a second interference zone. The assembly ring comprises a first ring segment (T) and a second ring segment (T) which are stepped axially in relation to one another and which have different radial dimensions from one another, such as to confine the first interference zone to the first ring segment (T) and the second interference zone to the second ring segment (T), in order to prevent the first interference zone and the second interference zone from overlapping axially.