Small four-stroke gasoline engine with oil mist lubrication

Details Small four-stroke gasoline engine with oil mist lubrication Small four-stroke gasoline engine with oil mist lubrication

2007-07-17

2007-07-17

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Lubricators

Crankcase, pressure control

C184S006500, C184S006260, C184S011100, C184S104300

Reexamination Certificate

active

10569027

ABSTRACT:
The present invention relates to a small four-stroke gasoline engine with oil mist lubrication. The lubrication oil way of the engine includes a crankshaft chamber B, a camshaft chamber C, an upper rocker arm chamber D and a condensation chamber E. The camshaft chamber C communicates with the upper rocker arm chamber D via a tappet cavity13. The upper rocker arm chamber D communicates with the condensation chamber E. An oil mist chamber A is surrounded by an upper case body3and a lower case body4at the side of the crankshaft chamber B, the bottom of the oil mist chamber A communicates with the crankshaft chamber B. An oilsplash impeller2is fixed on a crankshaft, which extends into the oil mist chamber A. An oil way12is provided on the upper case body3between the oil mist chamber A and the camshaft chamber C. An oil return way15is provided on a cylinder head assembly5. An oil return way14is provided on the upper case body3. An upper interface of the oil return way15communicates with the upper rocker arm chamber D, a lower interface of the oil return way15communicates with the oil return way14, and a lower interface of the oil return way14communicates with the crankshaft chamber B. The conventional lubricating mode is changed by the structure of the invention, which makes use of the pressure change during the reciprocating movement of a piston assembly8to attain the circulation of oil. The structure is simple, reliable in operation and has small consumption in power.

REFERENCES:
patent: 6394061 (2002-05-01), Ryu et al.

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