High pressure fuel supply pump
AssigneeDenso Corporation
InventorJun Kondo
Life of this patent
Estimating the term…
Abstract
In a high pressure fuel supply pump, a housing is provided with a through-hole having a step. A plunger is slidably accommodated in the through-hole on an axial end side thereof. An intake valve member is positioned in the through-hole on an axially opposite side to the plunger with respect to the step so that a pump chamber is formed between the plunger and the intake valve member. A discharge valve member is positioned in the through-hole on an axially opposite side to the plunger with respect to the intake valve member. A plug is screw fastened into an inner wall of the through-hole on another axial end thereof so as to urge both of the discharge valve member and the intake valve member against the step so that the intake valve member and the discharge valve member are rigidly fixed in the through-hole.
Claims9
A high pressure fuel supply pump comprising:
- a housing provided with a through-hole having a step;
- a plunger slidably accommodated and reciprocatingly movable in the through-hole extending from an axial end thereof to the step;
- an intake valve member positioned in the through-hole on an axially opposite side to the plunger with respect to the step and in contact with the step so that a pump chamber is formed between the plunger and the intake valve member, the intake valve member being provided with an intake check valve through which fuel is supplied to the pump chamber when the plunger moves in an opposite direction to the step;
- a discharge valve member positioned in the through-hole on an axially opposite side to the plunger with respect to the intake valve member and in contact with the intake valve member, the discharge valve member being provided with a discharge check valve through which fuel is discharged from the pump chamber when the plunger moves toward the step;
- and
- a plug screw fastened into an inner wall of the through-hole on another axial end thereof so as to axially push both of the discharge valve member and the intake valve member against the step so that the intake valve member and the discharge valve member are rigidly fixed in the through-hole.
A high pressure fuel supply pump comprising:
- a housing provided with a cylinder;
- a plunger slidably accommodated and reciprocatingly movable in the cylinder;
- a valve member attached to the housing at a position axially opposed to the plunger so that a pump chamber is formed between the plunger and the valve member, the valve member being provided with an intake check valve through which fuel is supplied to the pump chamber when the plunger moves in a direction away from the valve member and a discharge check valve through which fuel is discharged from the pump chamber when the plunger moves toward the valve member,
- wherein the intake check valve and the discharge check valve are positioned substantially in a column shaped region defined by axially casting a reflection of an axial end surface of the plunger on a side of the pump chamber.
Dependencies are inferred from the claim text.