Compressor housing for turbocharger and method of manufacturing the same

Abstract

A compressor housing for a turbocharger including a housing body having an inner circumferential recess recessively formed on an annular inner circumference surface thereof; an annular abradable seal disposed in the inner circumferential recess, an inner circumference surface of which forms a shroud surface; and a ring member formed in a ring shape along the inner circumferential recess and press-fitted into the inner circumferential recess. The inner circumferential recess includes a recess press-contact surface that is formed along a press-fitting direction of the ring member, and press-contacts a radial-direction outside surface of the ring member; and a recess opposing surface that opposes a press-fitting direction forward surface of the ring member. The abradable seal includes a flange that projects outwardly in a radial direction of the abradable seal. The flange is held between the press-fitting direction forward surface and the recess opposing surface to fix the abradable seal.

1 - 8 . (canceled) 
     
     
         9 . A compressor housing for a turbocharger configured to house an impeller, the compressor housing comprising:
 a housing body having an inner circumferential recess recessively formed on an annular inner circumference surface thereof along an outer circumference of the impeller;   an annular abradable seal that is disposed in the inner circumferential recess, an inner circumference surface of the abradable seal forming a shroud surface that opposes the impeller; and   a ring member that is formed in a ring shape along the inner circumferential recess and is press-fitted into the inner circumferential recess in an axial direction of the impeller; wherein   the inner circumferential recess includes a recess press-contact surface that is formed along a press-fitting direction of the ring member, and press-contacts a radial-direction outside surface of the ring member; and a recess opposing surface that opposes a press-fitting direction forward surface of the ring member,   the abradable seal includes a flange that projects outwardly in a radial direction of the abradable seal, and   the flange is held between the press-fitting direction forward surface and the recess opposing surface by press-fitting the ring member into the inner circumferential recess.   
     
     
         10 . The compressor housing according to  claim 9 , wherein the ring member is composed of a material identical to that of the housing body. 
     
     
         11 . The compressor housing according to  claim 9 , wherein the flange is formed on an entire circumference of the abradable seal. 
     
     
         12 . The compressor housing according to  claim 10 , wherein the flange is formed on an entire circumference of the abradable seal. 
     
     
         13 . The compressor housing according to  claim 9 , wherein the flange is provided at a first end portion of the abradable seal in an axial direction, and a second end portion of the abradable seal at an opposite side to the first end portion is spatially apart from an opposing end surface that faces the second end portion in the inner circumferential recess. 
     
     
         14 . The compressor housing according to  claim 10 , wherein the flange is provided at a first end portion of the abradable seal in an axial direction, and a second end portion of the abradable seal at an opposite side to the first end portion is spatially apart from an opposing end surface that faces the second end portion in the inner circumferential recess. 
     
     
         15 . The compressor housing according to  claim 11 , wherein the flange is provided at a first end portion of the abradable seal in an axial direction, and a second end portion of the abradable seal at an opposite side to the first end portion is spatially apart from an opposing end surface that faces the second end portion in the inner circumferential recess. 
     
     
         16 . The compressor housing according to  claim 12 , wherein the flange is provided at a first end portion of the abradable seal in an axial direction, and a second end portion of the abradable seal at an opposite side to the first end portion is spatially apart from an opposing end surface that faces the second end portion in the inner circumferential recess. 
     
     
         17 . The compressor housing according to  claim 9 , wherein an outer circumference surface of the abradable seal is spatially apart from an outer circumference surface of the inner circumferential recess. 
     
     
         18 . The compressor housing according to  claim 10 , wherein an outer circumference surface of the abradable seal is spatially apart from an outer circumference surface of the inner circumferential recess. 
     
     
         19 . The compressor housing according to  claim 11 , wherein an outer circumference surface of the abradable seal is spatially apart from an outer circumference surface of the inner circumferential recess. 
     
     
         20 . The compressor housing according to  claim 12 , wherein an outer circumference surface of the abradable seal is spatially apart from an outer circumference surface of the inner circumferential recess. 
     
     
         21 . The compressor housing according to  claim 13 , wherein an outer circumference surface of the abradable seal is spatially apart from an outer circumference surface of the inner circumferential recess. 
     
     
         22 . The compressor housing according to  claim 14 , wherein an outer circumference surface of the abradable seal is spatially apart from an outer circumference surface of the inner circumferential recess. 
     
     
         23 . The compressor housing according to  claim 15 , wherein an outer circumference surface of the abradable seal is spatially apart from an outer circumference surface of the inner circumferential recess. 
     
     
         24 . The compressor housing according to  claim 16 , wherein an outer circumference surface of the abradable seal is spatially apart from an outer circumference surface of the inner circumferential recess. 
     
     
         25 . A method of manufacturing the compressor housing according to  claim 9 , the method comprising the steps of:
 forming an integral raw material constructed from a housing raw material to be a raw material for the housing body, and a ring-shaped raw material to be a raw material for the ring member as a single body; and   machining and dividing the integral raw material to form the housing body and the ring member.   
     
     
         26 . The method of manufacturing the compressor housing according to  claim 25 , wherein in the step of forming an integral raw material, the ring-shaped raw material is formed as a single body with the housing raw material along a place for press-fitting the ring member. 
     
     
         27 . The method of manufacturing the compressor housing according to  claim 25 , wherein in the step of forming an integral raw material, the ring-shaped raw material is formed as a single body with the housing raw material along an end portion of an intake port that is formed at an opposite side to a side on which the ring member is to be press-fitted.