VACUUM PUMP ROTOR AND METHOD OF MANUFACTURING THE SAME

摘要

PCT No. PCT/JP99/00637 Sec. 371 Date Jan. 3, 2000 Sec. 102(e) Date Jan. 3, 2000 PCT Filed Feb. 15, 1999 PCT Pub. No. WO99/41503 PCT Pub. Date Aug. 19, 1999A rotor has an interior free from invasion of water and is resistant to deformation from applied stresses normally encountered during the operation of a vacuum pump. The rotor comprises a rotor shell formed to conform to an outline of lobes and side-plates for covering transverse ends of the rotor shell. A rotation shaft is secured to the side-plates. A hollow section is formed by the rotor shell and the side-plates which is under a vacuum environment.