In the production mannered null turbomachinery of the compressor impeller, and the turbomachinery which are used for

摘要

Including with the sleeve 30 which, possesses the tubular section 33 which with only to insert the drive shaft vis-a-vis the peripheral part of spine 19 of 15 which it tightened the turbocharger which is the turbomachinery, the compressor impeller vis-a-vis the connection hole 20 of the possession bottom where is provided in spine 19 of 13 which possesses spine 19 on the rear center and this compressor impeller 13 the insertion with only to insert, is connected and compressor impeller 13 is connected it constituted, it formed this sleeve 30 with the material whose linear expansion coefficient is smaller than compressor impeller 13. Therefore, with thermal expansion, trying, that the connection hole 20 of spine 19 will do enlarging diameter, because that enlarging diameter is controlled in tubular section 33, drive shaft be able to prevent the looseness between 15 and connection hole 20, it can maintain connection state satisfactorily.