Sealed-type hydraulic lash adjuster

Details Sealed-type hydraulic lash adjuster Sealed-type hydraulic lash adjuster

1986-12-16

1988-08-16

Wolfe, Jr., Willis R.

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9033, 123 9043, F01L 124

Patent

active

047636173

ABSTRACT:
A sealed-type hydraulic lash adjuster having a reservoir chamber holding a hydraulic oil having a molecular weight distribution substantially equal to the molecular weight distribution of the exterior oil surrounding the lash adjuster. The approximate matching of molecular weight distributions of the hydraulic oil within the lash adjuster, and the exterior oil contacting the outside of the lash adjuster ensures that the volume of oil in the reservoir chamber remains substantially constant, as the amount of hydraulic oil passing through the diaphragm of the lash adjuster from the reservoir is equal to the amount of exterior oil passing through the diaphragm into the reservoir chamber.

REFERENCES:
patent: 2757653 (1956-08-01), Links et al.
patent: 2833257 (1958-08-01), Lengnick
patent: 2871839 (1959-02-01), Mekkes
patent: 2925074 (1960-02-01), Dadd
patent: 2971502 (1961-02-01), Wride
patent: 4338894 (1982-07-01), Kodama
patent: 4359018 (1982-11-01), Wade
patent: 4457270 (1984-07-01), Kodama et al.
patent: 4491098 (1985-01-01), Rotondo
patent: 4694790 (1987-09-01), Kowal

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