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US 11,781,513 B2Granted
Discharge valve mechanism and high-pressure fuel supply pump including the same
AssigneeHitachi Astemo, Ltd.
InventorsKenichiro Tokuo, Hiroyuki Yamada, Kiyotaka Ogura, Shingo Tamura, Yuto Ishizuka
Life of this patent
Estimating the term…
Abstract
Provided is a discharge valve mechanism capable of improving responsiveness when a discharge valve is opened, and a high-pressure fuel supply pump including the discharge valve mechanism.
Claims13
A discharge valve mechanism comprising:
- a valve seat portion which has a primary-side flow path;
- a valve body which seats on and separates from the valve seat portion;
- a guide portion which is formed so as to be slidable on an outer surface of the valve body and guides movement of the valve body in a contacting/separating direction with respect to the valve seat portion,
- wherein the guide portion includes a portion in which a gap from an outer surface of the valve body is set to a predetermined value or less,
- a first secondary-side flow path which allows an internal space on an upstream side of the guide portion to communicate with an external flow path is formed so as to allow a fluid to flow out to a side in a moving direction of the valve body, and
- a second secondary-side flow path which allows an internal space on a downstream side of the guide portion to communicate with the external flow path is formed so as to allow a fluid to flow out to the side in the moving direction of the valve body;
- and
- a stopper portion which is formed to abut on the outer surface of the valve body and regulates a movement of the valve body in a lift direction,
- wherein the stopper portion is formed at a position between the guide portion and the second secondary-side flow path.
6 more elements
A discharge valve mechanism comprising:
- a valve seat portion which has a primary-side flow path;
- a valve body which seats on and separates from the valve seat portion;
- a guide portion which is formed so as to be slidable on an outer surface of the valve body and guides movement of the valve body in a contacting/separating direction with respect to the valve seat portion,
- wherein the guide portion includes a portion in which a gap from an outer surface of the valve body is set to a predetermined value or less, and
- a first secondary-side flow path that allows a space on an upstream side of the guide portion and an internal space formed at a position of the guide portion to communicate with an external flow path is formed so as to allow a fluid to flow out to a side in a moving direction of the valve body, and
- a second secondary-side flow path that allows an internal space on a downstream side of the guide portion to communicate with the external flow path is formed so as to allow a fluid to flow out to the side in the moving direction of the valve body;
- and
- a stopper portion which is formed to abut on an outer surface of the valve body and regulates movement of the valve body in a lift direction,
- wherein the stopper portion is formed on a downstream side of the guide portion, and
- the second secondary-side flow path is formed to allow an internal space formed at a position of the stopper portion to communicate with the external flow path.
7 more elements
Dependencies are inferred from the claim text.