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US 2019/0376606 A1Published application
High-pressure pump
AssigneeDenso Corporation
InventorMasaharu NAKAOKA
Life of this patent
Estimating the term…
Abstract
A discharge valve includes: a valve main body that slidably contacts an inner peripheral wall of a tubular portion; and a primary passage that is formed at the valve main body and is located between the valve main body and the inner peripheral wall of the tubular portion. A stopper includes: a stopper main body that is formed separately from the tubular portion while the stopper main body is located on a side of the discharge valve that is opposite to the discharge valve seat; a movement limit surface that is configured to limit movement of the discharge valve in a direction away from the discharge valve seat; and a secondary passage that is formed at the stopper main body.
Claims16
A high-pressure pump comprising:
- a housing that includes a pressurizing chamber, which is configured to pressurize fuel in the pressurizing chamber;
- a tubular portion that forms a discharge passage, which is configured to conduct the fuel discharged from the pressurizing chamber;
- a seat portion that includes:
- an upstream passage, which connects between the discharge passage and the pressurizing chamber;
- and
- a valve seat, which is formed on a side of the upstream passage where the discharge passage is located;
- a valve that includes:
- a valve main body that slidably contacts an inner peripheral wall of the tubular portion through an outer periphery of the valve main body such that axial movement of the valve main body is guided by the inner peripheral wall of the tubular portion while the valve main body is configured to contact the valve seat;
- and
- a plurality of primary passages that are formed at the valve main body and are located between the valve main body and the inner peripheral wall of the tubular portion, wherein the plurality of primary passages is configured to conduct the fuel from one side of the valve main body, at which the valve seat is located, to another side of the valve main body, which is opposite to the valve seat;
- and
- a stopper that includes:
- a stopper main body that is a member, which is formed separately from the tubular portion, wherein the stopper main body is located on the another side of the valve that is opposite to the valve seat;
- a movement limit surface that is configured to limit movement of the valve in a direction away from the valve seat when the movement limit surface contacts the valve;
- and
- a secondary passage that is formed at the stopper main body and is configured to conduct the fuel from one side of the stopper main body, at which the valve is located, to another side of the stopper main body, which is opposite to the valve, wherein:
- the plurality of primary passages is located on one side of the movement limit surface where the valve seat is located;
- the secondary passage is located on another side of the movement limit surface, which is opposite to the valve seat;
- and
- the plurality of primary passages is arranged in a circumferential direction of the valve main body.
17 more elements
A high-pressure pump comprising:
- a housing that includes a pressurizing chamber, which is configured to pressurize fuel in the pressurizing chamber;
- a seat portion that includes:
- an upstream passage, which is connected to the pressurizing chamber;
- and
- a valve seat, which is formed on a side of the upstream passage that is opposite to the pressurizing chamber;
- and
- a valve that is configured to contact the valve seat, wherein:
- the valve includes a valve extension that extends toward a side that is opposite to the seat portion;
- the valve is shaped in a circular disk form;
- and
- an outer diameter of the valve extension is larger than a diameter of the upstream passage.
8 more elements
A high-pressure pump comprising:
- a housing that includes a pressurizing chamber, which is configured to pressurize fuel in the pressurizing chamber;
- a tubular portion that forms a discharge passage, which is configured to conduct the fuel discharged from the pressurizing chamber;
- a seat portion that includes:
- an upstream passage, which connects between the discharge passage and the pressurizing chamber;
- and
- a valve seat, which is formed on a side of the upstream passage where the discharge passage is located;
- a valve that is configured to contact the valve seat;
- and
- a stopper support that is a member formed separately from the tubular portion and supports the stopper main body, wherein:
- the stopper support includes:
- an inner projection that is shaped in a ring form and projects from one end surface of the stopper support toward the tubular portion, wherein the inner projection contacts an end surface of the tubular portion, which is located on a side that is opposite to the seat portion;
- and
- an outer projection that is shaped in a ring form and projects from the one end surface of the stopper support toward the tubular portion while the outer projection is located on a radially outer side of the inner projection, wherein the outer projection contacts the end surface of the tubular portion, which is opposite to the seat portion;
- and
- the tubular portion includes a release passage that opens between the inner projection and the outer projection at the end surface of the tubular portion located on the side where the stopper support is located.
12 more elements
Dependencies are inferred from the claim text.