| 摘要 |
PURPOSE: To correctly control fuel injection rate by defining a pump working chamber between top end of a pump piston inserted in a guide cylinder and an axially displaceable piston, and arranging a ring slider in the piston that is projective from the guide cylinder. CONSTITUTION: A step type pump piston 4 is inserted into a guide cylinder 2 being a distributor, a sleeve 21 is slidably outer inserted in a top end of a part 7 having a small diameter, and a cylinder slider 44 is slidably outer inserted in a part having a big diameter and outward projective from the guider cylinder 2 for opening or closing an overflow transverse hole 42. And a piston body 24 is inserted from the other end into the sleeve 21, a pump working chamber 25 is defined between the end face of the piston part 7 and the sleeve. Position of the piston body 24 is limited by a stopper pin 12 screwed on a closing part 10, a control piston 18 defining a pressure control chamber 32 and a pressure release chamber 33 is installed in the stopper pin 12, and the pressure control chamber 32 is connected to an inner chamber 38 by a guide pipe 40, having the pressure in connection with the rotation number. |
