Engine speed control system

摘要

An engine includes a carburetor, a governor assembly, and a vacuum actuator. The carburetor includes a throttle plate configured to control a fluid flow, a throttle lever coupled to the throttle plate, and an intake port in fluid communication with an engine vacuum pressure. The governor assembly includes a governor, a governor linkage coupled to the governor and the throttle lever, and a governor spring coupled to the throttle lever to bias the throttle plate towards the fully open position. The vacuum actuator includes an actuator housing, a pressure-sensitive member positioned in the actuator housing, an actuator linkage directly coupled to the governor spring and also coupled to the pressure-sensitive member for movement in response to the engine vacuum pressure, and an actuator spring coupled between a fixed attachment point and the actuator linkage to bias the actuator linkage to increase the tension on the governor spring.

主权项

1. An engine, comprising:
a carburetor including a throttle plate configured to be movable between any one of a plurality of positions including fully open and fully closed to control a fluid flow through the carburetor, a throttle lever coupled to the throttle plate and configured to move the throttle plate among the plurality of positions, and an intake port in fluid communication with the fluid flow having an engine vacuum pressure; a governor assembly including a governor configured to detect an engine speed of the engine, a governor linkage coupled to the governor and the throttle lever so that movement of the governor moves the governor linkage, thereby moving the throttle lever and the throttle plate, and a governor spring coupled to the throttle lever to bias the throttle plate towards the fully open position; and a vacuum actuator including an actuator housing, a pressure-sensitive member positioned in the actuator housing and dividing the actuator housing into a vacuum side and an atmospheric side, an input port in fluid communication with the vacuum side of the actuator housing and in fluid communication with the intake port, an actuator linkage directly coupled to the governor spring and also coupled to the pressure-sensitive member for movement with the pressure-sensitive member in response to the engine vacuum pressure exerted on the pressure-sensitive member via the input port, and an actuator spring coupled between a fixed attachment point and the actuator linkage to bias the actuator linkage to increase the tension on the governor spring.