| 摘要 |
PURPOSE:To make the whole of an oil injection device compact as well as improve its reliability by mounting a permanent magnet on the rear end of a metering piston and further another permanent magnet intermittently coming near the metering piston behind rear end of the metering piston. CONSTITUTION:The first permanent magnet 309 is mounted on the rear end of a metering piston 313 while allowing said metering piston 313 to be positioned on the oposite side of a discharge port by means of a return spring 307, and the second permanent magnet 311 is installed behind the rear end of the metering piston 313 while allowing said second permanent magnet 311 to intermittently come near the metering piston 313. Hereby, it is possible to allow the metering piston 313 to go back and forth in response to the movement of the second permanent magnet 313, so that the whole device may be made compact together with the improvement of its reliability. |
