Plunger pump and braking device
AssigneeHitachi Automotive Systems, Ltd.
InventorsMasaki Misuno, Chiharu Nakazawa, Atsuki Oohira
Life of this patent
Estimating the term…
Abstract
Provided is a plunger pump where quietness can be ensured. A plunger pump includes a cylinder, a piston, a discharge valve, and a plug member. The plug member includes: a recessed portion formed on a circumferential wall of a discharge chamber opposing an outer periphery of the discharge valve in a radial direction; and a discharge passage disposed at a position different from the recessed portion, formed on the circumferential wall of the discharge chamber opposing the outer periphery of the discharge valve in the radial direction, and connecting the discharge chamber and the outside with each other.
Claims14
A plunger pump comprising:
- a cylinder;
- a piston accommodated in the cylinder in a movable manner;
- a discharge valve disposed on a side opposite to the piston in a direction of a movement axis of the piston, and defining a compression chamber in cooperation with the piston and an inner periphery of the cylinder;
- and
- a plug member defining a discharge chamber in cooperation with the discharge valve in the direction of the movement axis of the piston, wherein
- the plug member includes
- a recessed portion formed on a circumferential wall of the discharge chamber opposing an outer periphery of the discharge valve in a radial direction, and
- a discharge passage disposed at a position different from the recessed portion, formed on the circumferential wall of the discharge chamber opposing the outer periphery of the discharge valve in the radial direction, and connecting the discharge chamber and an outside with each other,
- wherein the recessed portion is formed in a range, in the direction of the movement axis of the piston, from a cylinder side to a position reaching or overreaching half of the discharge valve, and
- wherein the discharge passage is formed in a range, in the direction of the movement axis of the piston, from the cylinder side to a position which does not overreach the half of the discharge valve.
A braking device comprising:
- a housing having a fluid passage and a bore therein;
- and
- a plunger pump disposed in the housing, wherein
- the plunger pump includes
- a cylinder accommodated in the bore,
- a piston accommodated in the cylinder in a movable manner,
- a discharge valve disposed on a side opposite to the piston in a direction of a movement axis of the piston, and defining a compression chamber in cooperation with the piston and an inner periphery of the cylinder, and
- a plug member defining a discharge chamber in cooperation with the discharge valve in the direction of the movement axis of the piston, and
- the plug member includes
- a recessed portion formed on a circumferential wall of the discharge chamber opposing an outer periphery of the discharge valve in a radial direction, and
- a discharge passage disposed at a position different from the recessed portion, formed on the circumferential wall of the discharge chamber opposing the outer periphery of the discharge valve in the radial direction, and connecting the discharge chamber and the fluid passage with each other,
- wherein the recessed portion is formed in a range, in the direction of the movement axis of the piston, from a cylinder side to a position reaching or overreaching half of the discharge valve, and
- wherein the discharge passage is formed in a range, in the direction of the movement axis of the piston, from the cylinder side to a position which does not overreach the half of the discharge valve.
Dependencies are inferred from the claim text.