Start-assist device on a membrane carburetor

Details Start-assist device on a membrane carburetor Start-assist device on a membrane carburetor

1995-04-07

1996-10-01

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

12317916, F02M 108, F02M 3720

Patent

active

055603459

ABSTRACT:
The invention is directed to a start-assist device on a membrane carburetor of an internal combustion engine in a motor-driven chain saw which is to be started manually. The carburetor includes a control chamber delimited by a control membrane. The control chamber is supplied with fuel from a fuel tank via control valve. The control valve is opened by the control membrane when the underpressure builds up in the control chamber so that fuel flows in. This fuel is supplied to the air-inducting intake channel via an idle nozzle and a main nozzle. The fuel feed system further has an outlet for vapor bubbles or the like. A pump which is driven indirectly from the start operation is provided and has a suction connection connected to the outlet in order to ensure, with few start attempts, a reliable start of the engine independently of the temperature state of the engine and other influences.

REFERENCES:
patent: 3738622 (1973-06-01), Tuckey
patent: 4803963 (1989-02-01), Kleinhans
patent: 4824613 (1989-04-01), Scott et al.
patent: 4905641 (1990-03-01), Miller

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