Internal-combustion engines – Frame construction – Horizontal cylinder
Patent
1991-12-02
1993-09-07
Kamen, Noah P.
Internal-combustion engines
Frame construction
Horizontal cylinder
123 9033, 123311, 184 111, 30276, F02F 700
Patent
active
052419320
ABSTRACT:
A hand held powered tool is provided which is intended to be carried by an operator during use. The power tool has a frame, including a handle to be grasped by the operator, an implement affixed to the frame having a rotary input member and a small four-cycle lightweight internal combustion engine attached to the frame for driving the implement. The four-cycle engine is made up of a lightweight aluminum engine block having a cylindrical bore and an enclosed oil reservoir formed therein. A crankshaft is journaled to the engine block for rotation about a crankshaft axis. A piston reciprocates within the bore and is connected to the crankshaft by a connecting rod having oil splasher formed thereon for intermittently engaging the oil within the enclosed oil reservoir to splash lubricate the engine. The engine is provided with a cylinder head assembly defining a compact combustion chamber having a pair of overhead intake exhaust ports cooperating intake and exhaust valves. A lightweight high powered engine is thereby provided having relatively low HC and CO emissions.
REFERENCES:
patent: 4510897 (1985-04-01), Hatz
patent: 4762098 (1988-08-01), Tamba et al.
patent: 4969434 (1990-11-01), Nakagawa
patent: 5058542 (1991-10-01), Grayson et al.
Kamen Noah P.
Ryobi Outdoor Products
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