| 摘要 |
<p>A brake mechanism used in a vehicle, comprises: a gear (33) connected to an output shaft of an engine of the vehicle; a casing (1); a radial compressor (100) disposed in the casing (1) and having an impeller (8), an impeller shaft (71) extending from the back (68) of the impeller (9) in the casing (1), a suction port (10), and an outlet port (11) for sucking in air from the suction port (10), compressing it within the casing (1), and delivering it from the outlet port (11) by the impeller (9); another gear (34) that connects the impeller shaft (71) with the engine output shaft gear (33); a shaft support (91) for rotatably supporting the impeller shaft (71); and a recess (69) formed in the back (68) of the impeller (9) for accepting the shaft support (91). The arrangement substantially raises the resonance vibration frequency of the impeller shaft (71) due to an imbalance couple derived from the impeller construction, so that the resonace vibration is prevented during an ordinary engine operation since the length of the impeller shaft (71) between the point of rotatory-support and its rear end is substantially elongated whereas the overhang, i.e., that distance between the point of rotatory-support to the impeller's center of gravity is shortened. This arrangement, however, does not elongate the total length, a length from the impeller tip to the impeller shaft rear end.</p> |
