Multicylinder four-cycle combustion engine

Details Multicylinder four-cycle combustion engine Multicylinder four-cycle combustion engine

2006-08-29

2006-08-29

Argenbright, Tony M. (Department: 3747)

Internal-combustion engines

Frame construction

Horizontal cylinder

C123S311000, C123S058100

Reexamination Certificate

active

07096843

ABSTRACT:
There is provided a multicylinder four-cycle combustion engine, in which a communication hole is formed, to allow gases to flow smoothly form one cylinder to another so that the pumping loss occurring within the cylinders can be reduced. The combustion engine (E) includes an engine casing (EC) having defined therein a plurality of cylinders (2A to2D), each having a cylinder bore (20A to20D), and a crank chamber (30A to30D) below the respective cylinder bore. A partition wall (21) separating the neighbor cylinder bores (20A,20B;20C,20D) of the cylinders (2A to2D) and the crank chambers (30A to30D) from each other is formed with a communication hole (4). An open edge portion (4aa) of the uppermost edge (4a) thereof, which opens into the cylinder bore (20A to20D) has a circumferentially intermediate major portion extending in a direction substantially perpendicular to the cylinder longitudinal axis (CH).

REFERENCES:
patent: 11-182325 (1999-06-01), None

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