Cooling-air blower having a combustion-air channel which taps a

Details Cooling-air blower having a combustion-air channel which taps a Cooling-air blower having a combustion-air channel which taps a

1993-02-08

1993-12-14

Kamen, Noah P.

Internal-combustion engines

Cooling

Air-cooled

123 4165, 123 417, 123198E, F01P 100

Patent

active

052692655

ABSTRACT:
The invention is directed to a cooling-air blower for an internal combustion engine including a two-stroke engine of a portable handheld work apparatus. Cooling air is guided by a cooling-air channel to an internal combustion engine and a combustion-air channel conducts air to the intake pipe of the engine. A portion of the cooling-air flow is tapped at the pressure end of the blower. A segment of the combustion-air channel is disposed next to the cooling-air channel. A profile hollow body having a streamlined configuration extends from this segment of the combustion-air channel into the cooling-air channel. The profile hollow body is aligned at its location in the cooling-air channel with the flow direction of the cooling-air flow and has a rear end facing away from this flow. An inlet opening is provided in this rear end of the hollow body for receiving a portion of the cooling-air flow which is then passed to the combustion-air channel through the hollow body. The streamline configuration and location of the inlet opening permit a large quantity of air to be tapped without disturbing the cooling-air flow and without taking along dirt particles entrained in the cooling-air flow.

REFERENCES:
patent: 4261302 (1981-04-01), Sheldon
patent: 4537160 (1985-08-01), Shirai

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