Turbine for turbocharger and method for assembling turbocharger
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsTakao Yokoyama, Motoki Ebisu
Life of this patent
Estimating the term…
Abstract
A turbocharger is of reduced size and easy to assemble. A rotor blade upstream flow channel space has a cylindrical portion that is gradually reduced in the downstream direction of exhaust gas flow corresponding with a reduction in volume of the scroll chamber. A back plate is formed so as to swell out toward the rotor blade gradually in the downstream direction corresponding with the reduction in volume of the scroll chamber. The back plate, at a termination end thereof, approaches the rotor blade and reaches a position adjacent to a leading edge of the rotor blade whereby the flow channel space disappears substantially at this termination end.
Claims8
A turbine for a turbocharger comprising:
- a rotary shaft that is rotatably journaled by a bearing;
- a turbine wheel including a turbine disk provided at a shaft end of the rotary shaft, and a plurality of rotor blades that are provided to protrude outward in a radial direction from the turbine disk;
- a turbine housing including a scroll portion, the scroll portion being arranged so as to cover the turbine wheel and form a swirling flow in a circumferential direction of the turbine wheel, and a cylindrical portion that guides the swirling flow formed by the scroll portion in an axial direction of the turbine wheel,
- wherein the rotor blades are arranged in the cylindrical portion, and
- an upstream flow channel space in said cylindrical portion is located upstream of leading edges of the rotor blades in the axial direction of the turbine wheel and downstream of said scroll portion,
- wherein the scroll portion is formed so that an internal flow channel thereof communicates with the upstream flow channel space of the cylindrical portion and the cross-section of the upstream flow channel space decreases gradually along the circumferential direction of the turbine wheel, and
- wherein a partition wall that forms the rotor blade upstream flow channel space is formed so as to swell out gradually in an axial direction to a rotor blade side along the circumferential direction of the turbine wheel, and a termination end of the swelling portion swells out from the communication portion of the scroll portion to a position approaching the rotor blade side.
Dependencies are inferred from the claim text.