LIGHTWEIGHT OILLESS VACUUM PUMP

• Main Authors: MOMONO MASAYOSHI, HAMASHIMA EIJI
• Format: Patent
• Language: English
• Published: 04.07.1987
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS; STEAM ENGINES; WEAPONS

PURPOSE:To prevent a gap between the side surface of a rotor and the side housing from decreasing its clearance due to thermal expansion, by using zinc alloy for a thrust screw adapted to adjust a rotor shaft in its axial direction, and by using aluminum alloy for a casing and a housing. CONSTITUTION:A casing, a housing 3 and a front plate 2 of a vane pump are made of aluminum, alloy, and a rotor 4 supported on a rotor shaft 5 is stored in the housing 3. One end of the rotor shaft 5 is resiliently supported to the front plate 2 through the intermediary of a bearing 6, and the other end thereof is supported to the housing 3 by means of an axial position adjusting mechanism 13 provided with a thrust screw 14. The axial thermal expansion of the housing 3 is canceled out by the thermal expansion of the thrust screw 14 which is made of zinc alloy having a thermal expansion coefficient greater than that of aluminum alloy, thereby it is possible to prevent the side clearance of the rotor 4 from decreasing.