| 主权项 |
1. A high pressure pump comprising:
a cylinder forming member that includes: a cylinder hole; a pressurizing chamber, which is communicated with the cylinder hole; and a cylinder hole forming portion, which is configured into a tubular form and in which the cylinder hole is formed, wherein the cylinder hole forming portion projects on a side opposite from the pressurizing chamber and has a cylinder end, which is opposite from the pressurizing chamber; a plunger that includes: a slide surface, which is slidable along an inner peripheral wall surface of the cylinder hole; and a step portion, which is formed at a predetermined location of the plunger, wherein when the plunger is reciprocated in the cylinder hole in an axial direction of the cylinder hole, fuel is drawn into and pressurized in the pressurizing chamber; and a plunger stopper that is installed to the cylinder hole forming portion of the cylinder forming member, wherein the plunger stopper cooperates with the step portion of the plunger to limit movement of the plunger in a state where the slide surface of the plunger contacts an inner peripheral wall surface of the cylinder hole, wherein: the plunger includes:
a large diameter portion that has the slide surface and an end part, which is exposed in the pressurizing chamber; anda small diameter portion that extends from the large diameter portion on a side opposite from the pressurizing chamber, wherein an outer diameter of the small diameter portion is smaller than an outer diameter of the large diameter portion; the step portion forms a boundary between the large diameter portion and the small diameter portion; and the plunger stopper includes a stopper portion, against which the step portion contacts upon movement of the plunger in the cylinder hole; the plunger stopper is engaged to an outer peripheral wall surface of the cylinder hole forming portion of the cylinder forming member. |
