Compression release device for engine

Details Compression release device for engine Compression release device for engine

1986-06-30

1987-11-03

Dolinar, Andrew M.

Internal-combustion engines

Starting device

Compression relieving type

123188AA, 123193H, F01L 1308

Patent

active

047037237

ABSTRACT:
A compression release device for side-valve and overhead-valve internal combustion engines is disclosed, which takes advantages of the difference in thermal expansion of different materials to control the valve opening depending on the condition of ambient temperature. A first material of comparatively higher linear expansion coefficient is used for the cylinders and cylinder head, while a second material of comparatively lower expansion coefficient for the push rods and tappets for either or both of the intake and exhaust valves, with the valve or valves being set to take a valve lift enough to cause the valve, upon compression stroke, to remain properly slightly open at cold start to ease crankshaft rotation, while stay fully shut, as a result of the cylinders and cylinder head having undergone a greater degree of thermal expansion than the push rods and tappets, when the engine gets warmed up.

REFERENCES:
patent: 3362390 (1968-01-01), Esty
patent: 3735745 (1973-05-01), Hatz

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