초록 ▼

In a high-speed rotating shaft (10) of a supercharger which is rotatably supported by two radial bearings (12a, 12b) spaced at a fixed distance (L), directly couples a turbine impeller fixed to one end and a compressor impeller fixed to the other end, and transmits a rotational driving force of the

In a high-speed rotating shaft (10) of a supercharger which is rotatably supported by two radial bearings (12a, 12b) spaced at a fixed distance (L), directly couples a turbine impeller fixed to one end and a compressor impeller fixed to the other end, and transmits a rotational driving force of the turbine impeller to the compressor impeller, a small shaft portion (14) having a smaller diameter than a bearing portion is provided between bearings. The small shaft portion (14) is offset to a compressor side.

대표청구항 ▼

1. A high-speed rotating shaft arrangement for a supercharger, comprising: a shaft;a tubine impeller fixed to a first end of the shaft, and a compressor impeller fixed to a second end of the shaft,a first radial bearing disposed proximate the first end of the shaft and a second radial bearing spaced

1. A high-speed rotating shaft arrangement for a supercharger, comprising: a shaft;a tubine impeller fixed to a first end of the shaft, and a compressor impeller fixed to a second end of the shaft,a first radial bearing disposed proximate the first end of the shaft and a second radial bearing spaced at a fixed distance from the first radial bearing, and disposed proximate a second end of the shaft,wherein the shaft further comprises: a) a reduced diameter portion andb) a bearing engaging portion, the reduced diameter portion having a diameter smaller than the bearing engaging portion and a mid point closer to the second radial bearing than the first radial bearing so that a reduced diameter portion is offset with respect to a mid point of the fixed distance by which first and second radial bearings are spaced. 2. The high-speed rotating shaft arrangement for a supercharger as claimed in claim 1, wherein selection of an offset amount, a diameter and a length of the reduced diameter shaft portion parameters comprises means for decreasing a primary critical speed with respect to a rated speed so that a decreasing amount per unit time, of a secondary critical speed does not exceed a decreasing amount per unit time, of the primary critical speed.