| 摘要 |
PURPOSE:To improve the response performance in the operation of a power valve by introducing the air by the opening operation of a valve for introducing the atmosphere in a prescribed opening degree or more of a throttle valve, for the negative pressure for operating the power valve of a carburetor. CONSTITUTION:A power valve 8 is installed, bypassing the main jet 5 for the main nozzle 4 of a carburetor 1, and the intake negative pressure is always introduced into a chamber 11 from a hole 12, and a piston 10 is pulled up, and a power valve 8 operates in the closing direction. An air opened hole 15 is formed onto a negative pressure passage 13, and when the opening degree of a throttle valve 2 is small, a lever 21 does not contact with a lever 17, and a valve 18 closes a hole 15 by a spring 19. When the throttle valve 2 is opened in high loading, the lever 21 turns a lever 17 to open the hole 15, and then the atmosphere is introduced into a negative pressure passage, and a piston 10 is moved downwardly by a spring 14, and the valve 8 is opened to supply the auxiliary fuel. Therefore, rapid operation in comparison with the operation after detecting the the suction pipe negative pressure is permitted. |
