US 9,810,225 B2
Turbine for turbocharger and method for assembling turbocharger
Takao Yokoyama, Tokyo (JP); and Motoki Ebisu, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 14/347,980
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Oct. 17, 2012, PCT No. PCT/JP2012/076805
§ 371(c)(1), (2) Date Mar. 27, 2014,
PCT Pub. No. WO2013/099410, PCT Pub. Date Jul. 4, 2013.
Claims priority of application No. 2011-286968 (JP), filed on Dec. 27, 2011.
Prior Publication US 2014/0234091 A1, Aug. 21, 2014
Int. Cl. F04D 17/10 (2006.01); F01D 9/02 (2006.01); F02C 6/12 (2006.01); F01D 25/24 (2006.01)
CPC F04D 17/10 (2013.01) [F01D 9/026 (2013.01); F01D 25/24 (2013.01); F02C 6/12 (2013.01); F05D 2220/40 (2013.01); F05D 2230/60 (2013.01); Y10T 29/4924 (2015.01)] 8 Claims
OG exemplary drawing
 
1. 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.