Dual feed hydraulic lash adjuster

Details Dual feed hydraulic lash adjuster Dual feed hydraulic lash adjuster

2006-05-23

2006-05-23

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Rocker

C123S090390, C123S090440, C123S090460

Reexamination Certificate

active

07047925

ABSTRACT:
An improved dual feed hydraulic lash adjuster (HLA), for use in an internal combustion engine, comprising a hollow body and a plunger assembly disposed in a bore of the engine. A one-piece plunger body includes a first chamber for forming a low-pressure oil reservoir and receiving a lash adjustment mechanism, and a second chamber open at one end and partially closed hemispherically for supporting a rocker arm and providing valve deactivating oil thereto for an auxiliary valve actuation system. The first and second chambers are separated by a transverse web, optionally having a small-diameter passage therethrough for air evacuation. The one-piece plunger body provides a high degree of resistance to side loads which may be imposed on the HLA in use.

REFERENCES:
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patent: 4133332 (1979-01-01), Benson et al.
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patent: 6325034 (2001-12-01), Edelmayer
patent: 6619252 (2003-09-01), Haas et al.
patent: 0 908 605 (1999-04-01), None

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