Hydraulic lash adjuster and improved oil flow path therefor

Details Hydraulic lash adjuster and improved oil flow path therefor Hydraulic lash adjuster and improved oil flow path therefor

1998-01-26

1999-01-26

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Rocker

123 9036, 123 9055, F01L 124

Patent

active

058627855

ABSTRACT:
A hydraulic lash adjuster having a body (11) defining a blind bore (13) and a fluid port (35) in communication with a source of fluid pressure. Upper and lower plunger elements (17,19) are disposed within the body and define a low pressure fluid chamber (21). The upper end portion (53) of the lower plunger element (19) defines a series of openings (55) providing fluid communication from the bore (13) into the chamber (21). The bore (13) and the upper plunger element (17) define a radial clearance sufficient that the clearance and the openings (55) comprise substantially the only fluid path from the fluid port (35) to the chamber (21). The invention reduces the machining of the body (11) and the upper plunger (17) which are normally required, thus substantially reducing the cost of the lash adjuster.

REFERENCES:
patent: 3875908 (1975-04-01), Ayres
patent: 4098240 (1978-07-01), Abell, Jr.
patent: 4917059 (1990-04-01), Umeda
patent: 5509385 (1996-04-01), La Vieri
patent: 5622147 (1997-04-01), Edelmayer

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