Starting system for internal combustion engine

摘要

A starting system for an internal combustion engine automatically operates a starting feature on a carburetor associated with the engine. The starting system includes a cam with a bearing mounted on the crankshaft. The bearing is secured so that its inner race will always rotate with the crankshaft. The cam has bosses on one side and is shaped such that it includes a base and a lobe with an outer surface surrounding the cam. At least one spring-loaded pawl is mounted on the flywheel. The pawl is biased to engage a cam boss so as to cause the cam to rotate with the crankshaft during a start-up process. A spring loaded rocker arm is pivotally mounted adjacent the cam. The rocker arm has a roller assembly configured to ride on the outer surface of the cam. As the cam rotates, the roller assembly riding on the cam surface is pushed outward by the cam lobe. A throttle cable is attached at a first end to the rocker arm and at its opposite end to the starting feature on the carburetor. When the roller assembly ramps up the lobe, the throttle cable is pulled into an extended position to actuate the starting feature of the carburetor.

主权项

1. A starting system (20) for an internal combustion engine (10) for automatically operating a starting feature (22) on a carburetor (16) associated with the engine (10), the starting system comprising:
a cam (32) being operatively connected to a crankshaft (12) and said cam (32) being independently rotatable relative to said crankshaft (12), and wherein said cam (32) is formed of a base (42), a lobe (44) extending from said base (42), an outer surface (46) formed about said base (42) and said lobe (44), and a plurality of bosses (40) extending from a side surface (41); at least pawl (50) operatively connected to a flywheel (14), wherein said at least one pawl (50) is biased toward engagement with at least one of said plurality of bosses (40) extending from said cam (32); a rocker arm (52) pivotally mounted adjacent to said cam (32), said rocker (52) arm having roller assembly (54) attached thereto, said roller assembly (54) being biased into substantially continual contact with said outer surface (46) of said cam (32); a throttle cable (60) having a first end attached to said rocker arm (52) and a second end attached to said starting feature (22) on said carburetor (16), wherein movement of said roller assembly (54) along said outer surface (46) from a position adjacent to said base (42) to a position adjacent to said lobe (44) causes said rocker arm (52) to rotate and extend said throttle cable (60) which actuates said starting feature (22).