| 摘要 |
PROBLEM TO BE SOLVED: To reduce the mechanical loss of an entire rotor and improve the efficiency of a vehicle turbocharger 1 while accelerating increasing the pressure ratio of the vehicle turbocharger 1.SOLUTION: A turbocharger is configured so that a plurality of guide grooves 51 serving as a plurality of guide passages guiding exhaust gas from radially outward to radially inward is formed equidistantly in a back surface 39b of a turbine disc 39 along the circumferential direction, and each guide groove 51 is configured so that a radially inward end 51i thereof is located on a reverse rotation direction side (a side in the opposite direction to the rotation direction of a turbine impeller 37) with respect to a radially outward end 51o, and the abovementioned configuration enables the guide grooves 51 to function as a reverse swirl flow generation part generating a swirl flow in the reverse rotation direction relative to the turbine impeller 37 on the back surface 39b of the turbine disc 39.SELECTED DRAWING: Figure 1 |
