Automatic starting device for an internal combustion engine...

Details Automatic starting device for an internal combustion engine... Automatic starting device for an internal combustion engine...

F - Mech Eng,Light,Heat,Weapons

02

M

123/84

F02M 1/10 (2006.01)

Patent

CA 1305376

A B S T R A C T AUTOMATIC STARTING DEVICE FOR AN INTERNAL COMBUSTION ENGINE IN PARTICULAR FOR THE MANUALLY STARTED ENGINE OF A POWER TOOL Simple and reliable starting of the internal combustion engine of a power tool, for example of a chain saw (1), is achieved by means of the automatic starting device. For this purpose, automatic operation of the choke flap (15) is provided by means of the vacuum produced, on starting, in part of the housing (5) of the power tool. To achieve this, the throttle flap (12) and the choke flap (15) arranged one behind the other in the intake channel (13) of the carburettor (3) are coupled in such a manner that the throttle flap (12) remains in a partly open position until the choke flap (15) reaches a pre-set opening angle. This produces an over-rich petrol/ air mixture on starting of the cold engine, while, after the engine has started, sufficient air is supplied for a short time to permit combustion of the over-rich mixture. The vacuum for operating the choke flap (15) is expediently controlled as a function of the temperature of the power tool (Fig.2).

569370

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