Electro-Pneumatic Actuator For A Turbocharger Waste Gate, And A Turbocharger And A Method Employing Same

摘要

An electro-pneumatic actuator for a waste gate includes an electric actuator to impart linear motion to an actuator shaft, and a pneumatic chamber defining a passage extending therethrough, the actuator shaft extending through the passage, the pneumatic chamber being sealed with respect to the actuator shaft. A piston is disposed in the pneumatic chamber and arranged for movement in the pneumatic chamber, the piston being affixed to the actuator shaft such that the actuator shaft and the piston move together as a unit. There is a port into the pneumatic chamber for feeding a gas into the pneumatic chamber or exhausting the gas therefrom so as to exert a pressure force on the piston and thereby provide a pneumatic assist to the force exerted on the actuator shaft.

主权项

1. An electro-pneumatic actuator for a turbocharger waste gate, comprising:
an actuator shaft having a first end and a second end and defining an axis extending between the first and second ends, the second end being arranged for connection to a waste gate; an electric actuator coupled to the actuator shaft, the electric actuator being structured and arranged to exert a force on and impart linear motion to the actuator shaft substantially along a direction defined by the axis, for advancing and retracting the actuator shaft so as to adjust a position of the waste gate; a pneumatic chamber defining a passage extending therethrough, the actuator shaft extending through the passage, the pneumatic chamber being sealed with respect to the actuator shaft; a piston disposed in the pneumatic chamber and arranged for movement in the pneumatic chamber substantially along said direction, the piston being affixed to the actuator shaft such that the actuator shaft and the piston move together as a unit; and a port into the pneumatic chamber for feeding a gas into the pneumatic chamber or exhausting the gas therefrom so as to exert a pressure force on the piston and thereby provide a pneumatic assist to the force exerted on the actuator shaft.