Integral formed oil column extender for hydraulic lash adjuster

Details Integral formed oil column extender for hydraulic lash adjuster Integral formed oil column extender for hydraulic lash adjuster

1997-02-18

1998-01-13

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Tappet

2988843, F01L 124

Patent

active

057067732

ABSTRACT:
A hydraulic lash adjuster for an internal combustion engine, and a method of its construction is disclosed. The lash adjuster has a cylindrical follower body in which a tubular plunger is slidingly disposed. The plunger cooperates with the follower body to define a high pressure chamber therebetween which is supplied with fluid through a valved port. A low pressure chamber which operates to supply fluid to the high pressure chamber through the valved opening, is defined by an axial passage through the plunger. Fluid flows into and out of the low pressure chamber through a port in the wall of the plunger. Intermediate of the port and the valved opening is a radially inwardly extending annular shelf which is integral formed with the axial passage of the plunger using a mechanical shaving step to plow a portion of the plunger material from the wall of the axially extending passage. The annular shelf operates as a baffle to prevent loss of fluid from the low pressure chamber when the hydraulic lash adjuster is installed at an angle from vertical.

REFERENCES:
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patent: 2983991 (1961-05-01), Carlson
patent: 3224243 (1965-12-01), Van Deberg
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patent: 4840153 (1989-06-01), Aida et al.
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patent: 4917059 (1990-04-01), Umeda
patent: 4920935 (1990-05-01), Shida
patent: 5379730 (1995-01-01), Schaeffler
patent: 5430934 (1995-07-01), Groh et al.

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