Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent
1999-02-18
2000-03-21
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Tappet
123 9019, 123 9043, 123 9057, F01L 124
Patent
active
060390182
ABSTRACT:
A hydraulic lash adjuster having, in preferred embodiments, a body carrying a reciprocable plunger defining with a closed end of the body, a high pressure oil chamber from which oil may escape through a primary clearance between the plunger and body. Make up oil is fed from a low pressure chamber defined within the plunger. Thermal pump up of the lash adjuster is prevented by a control ring within the plunger which varies the leakdown path with oil temperature so that normal flow is attained at normal engine operating temperature and the clearance is increased to maintain adequate flow at cold engine starting and operating temperatures. In a first embodiment, the control ring forces the side wall of the plunger outward to reduce the primary clearance between the plunger and body. In a second embodiment, the control ring is loose in the plunger and controls a secondary clearance between the control ring and side wall of the plunger which allows higher flow at low temperatures and is reduced or eliminated at normal operating temperatures so that the primary clearance is controlling.
REFERENCES:
patent: 3598095 (1971-08-01), Ayres
patent: 5307769 (1994-05-01), Meagher et al.
patent: 5408959 (1995-04-01), Speil
Cichosz Vincent A.
General Motors Corporation
Lo Weilun
LandOfFree
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