Internal-combustion engines – Lubricators – Crankcase – pressure control
Reexamination Certificate
2005-09-20
2005-09-20
Yuen, Henry C. (Department: 3747)
Internal-combustion engines
Lubricators
Crankcase, pressure control
Reexamination Certificate
active
06945215
ABSTRACT:
A portable, operator-carried power tool having an implement supported on frame, and a lightweight, four-stroke, engine drivably connected to the implement. The engine has a crankshaft situated in a crankshaft housing and a cylinder block secured to the housing, the crankshaft being provided with a crankcase ventilation passage extending between the crankcase and an outlet end in communication with an air/fuel induction passage. A passage establishes communication between the interior of the crankcase and the valve chamber through a cam and cam gear region of the cylinder block. An oil mist generator is connected drivably to the crankshaft for agitating liquid oil in the crankcase to establish a lubricating oil mist. The crankcase, cam region and valve chamber form a containment whereby oil mist is distributed throughout the engine during operation regardless of angular orientation.
REFERENCES:
patent: 5176116 (1993-01-01), Imagawa et al.
patent: 5709185 (1998-01-01), Aizawa et al.
patent: 6039020 (2000-03-01), Kawamoto et al.
patent: 6047678 (2000-04-01), Kurihara et al.
patent: 6374796 (2002-04-01), Kawamoto et al.
Imgawa Yoichi
Kawamoto Shiro
Rickard Harry Gene
Sheldon John
Ali Hyder
Brinks Hofer Gilson & Lione
MTD Southwest Inc.
Yuen Henry C.
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