Turbocharger

Abstract

A compressor wheel includes a shaft portion, which extends in the rotation axis direction of the compressor wheel. Blades protrude in the radial direction from the shaft portion. The blades are spaced apart from each other in the circumferential direction of the compressor wheel. The compressor housing has an accommodation space that accommodates the compressor wheel. The compressor housing also has an introduction passage defined therein. The introduction passage is connected to the accommodation space from the intake side and introduces intake air into the accommodation space. Plate-shaped guide vanes protrude from the inner wall surface of the introduction passage. The guide vanes are spaced apart from each other in the circumferential direction of the introduction passage. The number of the guide vanes is the smallest odd number that is greater than the number of the blades.

What is claimed is: 
     
         1 . A turbocharger comprising:
 a compressor housing attached to an intake line; and   a compressor wheel that is accommodated in the compressor housing, wherein   the compressor wheel includes
 a shaft portion that extends in a rotation axis direction of the compressor wheel, and 
 a plurality of blades that protrudes outward from the shaft portion in a radial direction, 
   the blades are spaced apart from each other in a circumferential direction of the compressor wheel,   an accommodation space and an introduction passage are defined in the compressor housing,   the accommodation space is configured to accommodate the compressor wheel,   the introduction passage is connected to the accommodation space from a first side in the rotation axis direction to introduce intake air into the accommodation space,   a plurality of plate-shaped guide vanes protrude from an inner wall surface of the introduction passage,   the guide vanes are spaced apart from each other in a circumferential direction of the introduction passage, and   a number of the guide vanes is the smallest odd number that is greater than a number of the blades.   
     
     
         2 . The turbocharger according to  claim 1 , wherein
 the compressor wheel includes a plurality of auxiliary blades that protrudes outward from the shaft portion in the radial direction,   the auxiliary blades are each arranged between two of the blades that are arranged side by side in a circumferential direction of the compressor wheel, and   the ends of the blades on the first side in the rotation axis direction are located on the first side in the rotation axis direction of the ends of the auxiliary blades on the first side in the rotation axis direction.   
     
     
         3 . The turbocharger according to  claim 1 , wherein
 a central axis of the introduction passage coincides with the rotation axis,   a first side in the rotation axis direction of the introduction passage is open to the outside of the compressor housing,   in the rotation axis direction, a point at which a distance from an end on the first side of the introduction passage is equal to a distance from an end on the first side of the blade is defined as a midpoint,   in the rotation axis direction, the guide vanes extend from the ends on the first side in the introduction passage to points between the midpoint and the blades.   
     
     
         4 . The turbocharger according to  claim 1 , wherein
 the compressor housing includes
 a housing body that includes the accommodation space defined therein and an insertion hole defined therein, the insertion hole extending toward a first side in the rotation axis direction from the accommodation space and opening to the outside of the compressor housing, and 
 a tubular member that is inserted into the insertion hole, 
   the insertion hole includes
 a small diameter portion, and 
 a large diameter portion that has an inner diameter greater than that of the small diameter portion, the large diameter portion being located on the first side in the rotation axis direction of the small diameter portion and extending from the small diameter portion to an end on the first side in the rotation axis direction of the insertion hole, 
   the tubular member is fitted in the large diameter portion,   an interior of the tubular member constitutes the introduction passage, and   the tubular member and the guide vanes are parts of an integrally molded member.