Internal combustion engine for a portable handheld work apparatu

Details Internal combustion engine for a portable handheld work apparatu Internal combustion engine for a portable handheld work apparatu

1999-01-14

2000-11-28

Kwon, John

Internal-combustion engines

Lubricators

Crankcase, pressure control

126196M, 126 9033, F01M 100

Patent

active

061520985

ABSTRACT:
The invention is directed to an internal combustion engine for a portable handheld work apparatus. The engine includes a cylinder having a combustion chamber and a piston rotates a crankshaft via a connecting rod. The crankshaft is mounted in a crankcase and is connected to a cam drive. The cam drive drives a valve control for an inlet valve and an outlet valve. The inlet valve controls an overflow channel which leads from the crankcase to the combustion chamber, and the outlet valve controls an outlet channel branching away from the combustion chamber. Furthermore, an intake channel, which opens into the crankcase, and a housing, which is separate from the crankcase, are provided for the cam drive. In order to provide a lubrication for the cam drive which is independent of position, the cam drive is configured as a gear wheel drive and an oil sump is provided in the housing of the cam drive. At least one gear wheel of the cam drive is so arranged that it dips at least partially into the oil sump and pumps oil for lubricating the movable parts of the engine.

REFERENCES:
patent: 5176116 (1993-01-01), Imagawa et al.
patent: 5857441 (1999-01-01), Yonezawa et al.
patent: 5950590 (1999-09-01), Everts et al.
patent: 5960764 (1999-10-01), Araki

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