Hydraulic lash adjuster with an open ended top plunger surface

Details Hydraulic lash adjuster with an open ended top plunger surface Hydraulic lash adjuster with an open ended top plunger surface

1998-08-24

1999-10-19

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Rocker

123 9036, 123 9057, F01L 124

Patent

active

059671050

ABSTRACT:
A hydraulic lash adjuster mechanism for an internal combustion engine having a body portion with a bore formed in the body portion having a bottom surface. A plunger having a top surface is slidingly received within the bore of the body portion. The plunger has an internal channel with a bleed hole formed therein connecting the top surface of the plunger to a high pressure chamber formed between the bottom surface of the bore and the bottom of the plunger. The body portion has a valve opening formed therein that is in fluid communication with an engine fluid supply. A check valve mechanism selectively opens and closing the valve opening in response to pressure differences between the engine fluid reservoir and the high pressure chamber. The diameter and length of the bleed hole and the force applied to said top surface of said plunger control the leak down rate of the hydraulic lash adjuster to eliminate lash in the engine valve train components.

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