Bi-plastic self-locking valve spring retainer

Details Bi-plastic self-locking valve spring retainer Bi-plastic self-locking valve spring retainer

1993-03-09

1993-10-26

Wolfe, Willis R.

Internal-combustion engines

Poppet valve operating mechanism

Spring

12318813, 12318817, 251337, 267174, 267179, F01L 310

Patent

active

052556409

ABSTRACT:
A self-locking valve spring retainer (30) operatively retaining a return spring (28) on the stem (20) of a poppet valve (16) comprises an annular base ring (48) from which three flexible arms (52) upwardly extend. A locking step (66) projects radially inwardly from each of the arms (52) to provide an engaging ledge (70) which interlocks with a corresponding mating projection (68) of the valve stem (20). An annular waisted hinge (86) is formed between the three arms (52) and the base ring (48) to ease stresses on the retainer (30) as the arms (52) are blossomed outwardly during installation and removal. The annular base ring (48) is fabricated from a first organic polymeric material capable of deformation thus permitting the arms (52) to flex outward therefrom. The locking step (66) of each arm (52) is fabricated from a second organic polymeric material, harder than the first material, thereby forming a durable interface between the valve stem (20 ) and the arms (52) to better distribute shear forces throughout the arms (52).

REFERENCES:
patent: 4432311 (1984-02-01), Holtzberg et al.
patent: 4653726 (1987-03-01), Lang et al.
patent: 4665869 (1987-05-01), Hinz et al.
patent: 4879978 (1989-11-01), Pierce
patent: 4989556 (1991-02-01), Shiina et al.
patent: 5143351 (1992-09-01), Pierce

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