Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent
1982-08-27
1984-08-07
Feinberg, Craig R.
Internal-combustion engines
Poppet valve operating mechanism
Tappet
123 9046, 123 9055, 123 9052, F01L 124, F01L 102
Patent
active
044637144
ABSTRACT:
A hydraulic lifter has an upper plunger member and a lower plunger member slidably received in a bore of a casing. A reservoir chamber is formed in the upper and lower plunger members for receiving hydraulic fluid, and a pressure chamber is formed between a blind bottom end of the casing and the bottom of the lower plunger. Both chambers are fluidly connected through a check valve. In order to vent air in the reservoir chamber and thereby to prevent air from entering the pressure chamber, there is formed in the upper plunger member at least one air vent hole located above a fluid inlet of the reservoir chamber. There is further formed a fluid passage between the upper plunger and the lower plunger for allowing fluid in the clearance between the casing and the plunger members to return to the reservoir chamber. This fluid passage may comprises a plurality of radially extending grooves formed either in the face of the bottom end of the upper plunger or in the face of the top end of the lower plunger.
REFERENCES:
patent: 3140698 (1964-07-01), Voorhies
patent: 3177857 (1965-04-01), Kuchen et al.
patent: 3799129 (1974-03-01), Cornell
patent: 4184464 (1980-01-01), Svihlik
patent: 4227495 (1980-10-01), Krieg
patent: 4228771 (1980-10-01), Krieg
Feinberg Craig R.
Nissan Motor Company Limited
Okonsky David A.
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