| 摘要 |
PURPOSE:To reduce the capacity of a motor and the consumption of oil by communicating the oil chambers formed below respective plungers and the oil chamber in a slide by the ports pierced to a piston rod thereby forming a closed circuit. CONSTITUTION:When a solenoid valve 20 is energized to move upward a piston 16, a swash plate 5 operating cooperatively with the piston inclines downward toward the right thereby bringing the port B under high pressure and the port A under low pressure and forcing a slide 20 to descend. When a limit switch 27 is tripped by the descending slide 10, the valve 20 is de-energized and 20' energized to move downward a piston 16'. The plate 5 tilts downward toward the left thereby bringing the port B under low pressure and the port A under high pressure and forcing the slide 10 to ascend. When a limit switch 28 is tripped by the asecending slide 10, the solenoid 18 is de-energized and the piston 16' is reset to the neutral position by the elastic force of a spring 17', so that the slide 10 is stopped without inclining of the plate 5. |
