Actuator for a wastegate or a variable turbine geometry device and method of actuation

摘要

An actuator has a rotary drive and a threaded element for converting the rotary motion of the rotary drive into a reciprocating motion of a tappet connected to a hinged wastegate and/or to a variable turbine geometry device of an exhaust gas turbocharger. The tappet and/or an axle between the tappet and the threaded element is received in at least one guide comprising at least one web and allowing for at least a slight tilting or pivoting movement of the tappet in at least one direction. At least some play is present between the web and at least one broadened portion on the tappet and/or on the axle. Methods of actuating a wastegate and/or a variable turbine geometry device.

主权项

1. An actuator for an exhaust gas turbocharger, comprising:
a rotary drive; and a threaded element for converting the rotary motion of the rotary drive into a substantially linear reciprocating motion of a tappet along a longitudinal axis of the tappet, wherein the tappet is connected to at least one of a hinged wastegate and a variable turbine geometry device of the exhaust gas turbocharger; an axle interposed between the tappet and the threaded element; wherein at least one of the tappet and the axle is received in at least one guide comprising at least one web and allowing for at least a slight tilting or pivoting movement of the tappet in at least one direction, with play being present between the web and at least one broadened portion on the tappet or the axle; wherein the tappet cooperates with the threaded element through at least one roller having a crowned surface that contacts the threaded element, and wherein the crowned surface allows the roller to act as a ball joint to facilitate the slight tilting or pivoting movement of the tappet.