A COMPACT ROTARY WASTEGATE VALVE

摘要

A turbocharger includes a turbine section and a compressor section. The turbine section includes a turbine housing (1) that surrounds a turbine wheel (15). The turbine housing (1) defines an exhaust gas inlet (2), a duct (6) that extends between the inlet (2) and the turbine wheel (15), and a wastegate opening (5) in the duct (6). A, butterfly-type wastegate valve (3) including a valve plate (10) and a rotatable shaft (11) is disposed in the opening (5) and rotates between an open position and a closed position. A spring (4) is attached to the shaft (11) to bias (4) the shaft (11) toward rotation about a longitudinal axis in a first direction; wherein pressure of a gas flowing in the exhaust duct (6) against the valve plate (10) causes a rotary motion of the valve plate (10) and rotatable shaft (11) against the spring bias in a second direction.

主权项

1. A turbocharger comprising,
a turbine section including a turbine housing (1) that surrounds a turbine wheel (15), the turbine housing (1) defining an exhaust gas inlet (2), a duct (6) that extends between the inlet (2) and the turbine wheel (15), and an opening (5) in the duct (6), an actuator-free, exhaust gas pressure-actuated, butterfly valve (3) disposed in the opening (5) and rotatable between an open position and a closed position, the valve (3) comprising:
a rotatable shaft (11) including a longitudinal axis (14),a valve plate (10) secured to the shaft (11) along a non-diameter chord of the valve plate; anda spring (4) attached to the rotatable shaft (11) in a manner such that the spring (4) biases the shaft (4) toward rotation about the longitudinal axis (14) in a first direction; wherein pressure of a gas flowing in the exhaust duct (6) against the valve plate (10) causes a rotary motion of the valve plate (10) and rotatable shaft (11) against the spring bias in a second direction opposite the first direction.