Patent ID: 6318324
Filing Date: 2001-11-20
Classification: F01L

Abstract:
A hydraulic lash adjuster for an engine comprising:a body with a blind bore formed therein;a unitarily formed plunger body slidingly received within said blind bore and having a fluid entry aperture in the top of said plunger body and a fluid return aperture in the side of said plunger body, the fluid entry aperture having a spherically shaped pushrod seat adapted to receive a spherical ball end of a pushrod;a high pressure cavity formed between the bottom of said blind bore and said plunger body;a valve opening in said plunger body providing fluid communication between said high pressure cavity and a supply of fluid;a check valve element for selectively opening or closing said valve opening in response to a pressure differential between said high pressure cavity and said supply of fluid;a low pressure cavity formed between said check valve element, said fluid entry aperture;a spring normally urging said plunger body outward of said blind bore; anda seal received over said plunger body and positioned above said fluid return aperture, said seal operable to prevent fluid from flowing from said high pressure cavity into an engine cavity.