Internal-combustion engines – Charge forming device – Heating of combustible mixture
Patent
1988-09-01
1990-01-02
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Heating of combustible mixture
123 65EM, F01D 710, F02M 3108
Patent
active
048905950
ABSTRACT:
The invention is directed to an arrangement for heating the intake air of the carburetor of the engine of a handheld portable tool such as a chain saw. The fresh air entering the air intake line is quickly and adequately heated and directed to the carburetor as intake air without the danger of this intake air becoming entrained with dirt particles. In the arrangement according to the invention, the handheld portable tool can be operated at low temperatures without disturbances in the carburetor system such as freezing of the throttle flap or the main nozzle. The air intake line is lead through the muffler which is configured as a collection chamber for the exhaust gas. The heat of the hot exhaust gases passing through the muffler is transferred to the fresh air entering and passing through the intake line.
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Andreas Stihl
Macy M.
Ottesen Walter
Wolfe Willis R.
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