Patent ID: 6343780
Filing Date: 2002-02-05
Classification: F02M

Abstract:
An acceleration apparatus of a carburetor comprising:a throttle valve (14) for opening and closing an intake passage (2) extending through a main body of a carburetor (1); a throttle valve operating shaft (4) rotatably supported to a supporting boss (3) of the main body of the carburetor (1), having a throttle lever (5) mounted at an end portion thereof, and opening and closing the throttle valve (14); a cam lever (8) fixed to a throttle valve operating shaft (4A) disposed between the throttle lever (5) and the end portion (3A) of the supporting boss (3) and provided with a cam surface (8A); an acceleration pump operating shaft (9) stood from the main body of the carburetor (1); a first lever (10) rotatably pivoted to the acceleration pump operating shaft (9) and brought into contact with the cam surface (8A) of the cam lever (8) by a first spring (12) for urging in a first rotational direction (A); and a second lever (11) rotatably pivoted to the acceleration pump operating shaft (9), brought into contact with a restriction portion (10C) of the first lever (10) by a second spring (13) for urging in a second rotational direction (B), and arranged in such a manner as to be brought into contact with a pump rod (6H) for pressing a pump diaphragm (7) of a pump apparatus (P), wherein a contact portion (K) of the first lever (10) brought into contact with the cam surface (8A) of said cam lever (8) is arranged between the throttle lever (5) and the end portion (3A) of the supporting boss (3) in a direction of a longitudinal axis (Yâ€”Y) of the throttle valve operating shaft (4) and within a projected plane of the throttle lever (5) on a surface perpendicular to the longitudinal axis (Yâ€”Y) of the throttle valve operating shaft (4).