| 摘要 |
PURPOSE:To prevent generation of seizure and abnormal high-temperature on the surface of a rotor in high-speed revolution by forming oil feeding grooves in the direction of the tangential sealing part on the rear and the front side plates and allowing said grooves to communicate to a back-pressure oil feeding hole through a bearing. CONSTITUTION:The pressurized oil equivalent to the discharge pressure flows into the back- pressure oil feeding hole 12 on the rear side plate 5 on one side of a cam ring 3, and said pressurized oil flows into the thrust needle bearing 14 which supports a rotor 6 from the hole 12 through a passage 13, and a vane 8 is allowed to spring-out to the outer periphery of the rotor 6 by said pressurized oil, and further the oil is gushed onto the rear side slidable surface of the rotor 6 through the passage 16 communicated to the point immediately after the compression cycle from the gap formed with a radial needle bearing 7, and forced to divengently flow into the front side plate 4 from the hole 12 through a passage 17. As a cicumferential oil groove 19 and an oil groove 22 in tangential direction are formed on the plate on the outer periphery of the bearing 14, the pressurized oil which flows into the groove 19 is always gushed onto the both edge surfaces of the rotor 6 and in the direction of the tangential sealing part by a centrifugal force, and lubrication films are formed on the both edge surfaces of the rotor and in the vicinity of the tangential sealing part, and thus the rotor 6 is guarded. |
