Actuating device for an exhaust gas flow control element of an exhaust gas turbocharger

摘要

Actuating device for a gas flow control element arranged in an inflow path of a turbocharger turbine and connected to a spindle traversing a turbine housing wall and fixed to an adjusting element adjoining said wall; a resilient seal pretensioned in the spindle axis direction comprises at least one annular sealing disc traversed by the spindle and being a resilient sheet metal ring is installed between said wall and the adjusting element said ring being pressed with bead feet of at least one annular half bead against an abutment surface fixed relative to the adjusting element and an abutment surface fixed relative to said wall, and the seal together with said abutment surfaces and at least the spindle delimit a space being sealed gastightly except for at least a gap between the spindle and said wall.

主权项

1. An exhaust gas turbocharger for an internal combustion engine, said turbocharger having an exhaust gas driven turbine, a turbine housing, an exhaust gas inflow path, an exhaust gas flow control element arranged in the exhaust gas inflow path, and an actuating device for the exhaust gas flow control element, said actuating device comprising a spindle connected to the exhaust gas flow control element and extending through a bush which passes through a wall of the turbine housing, the bush being fixed in said wall and bordering at all operating temperatures of the turbocharger in a gastight manner on said wall, and the spindle being directly and rotatably mounted in the bush and being fixedly connected to an adjusting element located on the outside of the turbine housing and adjacent to the housing, an exhaust gas seal through which the spindle passes being arranged between a first abutment surface fixed relative to the adjusting element and a second abutment surface located on the outside of the turbine housing, fixed relative to the turbine housing and facing the adjusting element, and the two abutment surfaces each forming an exhaust gas sealing contact surface through which a spindle axis passes, said exhaust gas seal having sealing zones surrounding the spindle axis and being adapted for gas sealing interacting with said exhaust gas sealing contact surfaces, and said exhaust gas seal having only a single sheet metal ring which surrounds the spindle axis and is made of a metal having spring steel-like spring characteristics at operating temperatures of the seal, the sheet metal ring having at least one offset surrounding the spindle axis and forming a half bead such that ring-shaped regions of the sheet metal ring provide said sealing zones and lie in a radial direction in relation to the spindle axis on either side of the offset and are offset from each other in the direction of the spindle axis, the first abutment surface facing the turbine housing and the spindle being connected in a gastight manner to the adjusting element, the exhaust gas sealing contact surfaces facing each other in the direction of the spindle axis and being offset from each other in a radial direction in relation to the spindle axis, the sealing zones of the exhaust gas seal formed by the ring-shaped regions of the sheet metal ring lying resiliently in the direction of the spindle axis against the exhaust gas sealing contact surfaces, and the exhaust gas sealing contact surfaces together with the seal and at least the spindle forming and delimiting a space which is sealed in a gastight manner except for a gap between the spindle and the bush, said gap being gastightly sealed by the sheet metal ring and said exhaust gas sealing contact surfaces.