Composite Spring Retainer And Method Of Assembly In A Brake Master Cylinder

摘要

A cup shaped spring retainer is slidably disposed within a cup shaped piston, encapsulating a spring therebetween. The side wall of the spring retainer presents a plurality of recesses and a plurality of slots defining a plurality of fingers. A tang, projects radially outward at the distal end of each of the fingers to engage a retaining ring within the piston in a latch position. The combination of the spring retainer and the piston provide an arrangement whereby all of the fingers may be compressed with the spring retainer outside of the piston to an insert position with the tangs disposed in gripping engagement with the spring. After inserting the compressed spring retainer into the piston, the radial compression the of the fingers may be released to allow the fingers to expand from the insert position to the latch position at which point the deflection of the fingers is discontinued.

主权项

1. An apparatus for installation in a brake master cylinder comprising;
a piston having a cup shape including a tubular wall extending about an axis between a mouth end having a first diameter and a seat, a retaining ring projecting radially inward from said tubular wall to define a first catch shoulder spaced from said mouth end a first length and facing said seat, said retaining ring presenting a first ramp extending radially upward and inward from said tubular wall toward said axis and axially away from said mouth end of said piston, said retaining ring presenting an inner wall defining a second diameter extending from said first ramp in an axial direction and terminating at said first catch shoulder, a spring retainer having a side wall extending axially from a base to a distal end and defining a plurality of slots to present a plurality of fingers between said slots, said spring retainer slidably disposed in said piston, a spring disposed in said spring retainer reacting with and extending between said base of said spring retainer and said seat of said piston, said slots each being defined by two edges extending from said distal end to a bottom end having a semi-circular shape and defining a lowermost point, a tang projecting radially outward at said distal end of each of said fingers to define a second ramp connected by an axially extending peripheral wall to a second catch shoulder having a third diameter and axially spaced a second length from said lowermost point of said slots, said shoulders being disposed in radial overlapping relationship with one another and said side wall of said spring retainer engaging said inner wall of said retaining ring in a latch position, said second length in said spring retainer being longer than said first length in said piston by a third length, and said side wall having a height and an outer surface presenting a plurality of recesses spaced at regular intervals circumferentially and extending axially along said height of said side wall.