| 摘要 |
PCT No. PCT/SE97/01687 Sec. 371 Date Mar. 22, 1999 Sec. 102(e) Date Mar. 22, 1999 PCT Filed Oct. 9, 1997 PCT Pub. No. WO98/17914 PCT Pub. Date Apr. 30, 1998A rotor (2, 3) is provided with bearing trunnions (4, 5). The rotor is made of a material with limited strength properties, such as aluminum. At least one of the bearing trunnions (4) comprises a concentric sleeve (20) made of steel at one end of the rotor. The inner end (21) of the sleeve (20) is radially attached to the rotor end (22) by a trunnion (4) protruding into the sleeve, or by a groove (40) in the rotor end (22), into which groove the inner end (21) of the sleeve protrudes. The outer end of the sleeve (20) is kept by a screw (25, 27) screwed into the rotor (2, 3) and provided with a screw head (24) pressed axially in the direction towards the rotor end (22).
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