Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent
1974-09-23
1976-07-06
Myhre, Charles J.
Internal-combustion engines
Poppet valve operating mechanism
Tappet
123 9034, 123 9035, 123 9056, F01L 114
Patent
active
039676021
ABSTRACT:
A hydraulic valve lifter for a reciprocating internal combustion engine has a displaceable plunger within a body for coupling a cam lobe with a push rod in a valve train. The cam lobe acts on the base of the body. A cavity within the plunger receives oil from the engine's oil supply and delivers oil through a check valve to a second cavity outside the plunger and within the body. Oil in the second cavity force couples the plunger and the cam lobe. The volume of oil in the second cavity determines the position of the plunger. A controlled leak path from the second cavity and through the base of the body allows oil to leave the second cavity at a controlled rate. Leakage at low engine speeds prevents complete lift of the plunger, and valve overlap and lift are reduced over that which occurs at full lift. At higher engine speeds, the flow of oil into the second cavity exceeds the flow of oil out through the leak path to lift the plunger and increase exhaust and intake valve overlap and valve lift, and valve duration. (Valve duration is defined as the time, usually expressed in crankshaft degrees, the valves are open.) At all engine speeds the leakage lubricates the surfaces of the body and the cam lobe which contact each other.
REFERENCES:
patent: 1442698 (1923-01-01), Page
patent: 1741230 (1929-12-01), Goodwin
patent: 2036936 (1936-04-01), Halford
patent: 2309740 (1943-02-01), Voorhies
patent: 2765783 (1956-10-01), Randol
patent: 2840063 (1958-06-01), Purchas
patent: 3176669 (1965-04-01), Kuchen
patent: 3291107 (1966-12-01), Cornell
patent: 3299986 (1967-01-01), Briggs
patent: 3304925 (1967-02-01), Rhoads
patent: 3742921 (1973-07-01), Rendine
Myhre Charles J.
O'Connor Daniel J.
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