High-pressure pump, in particular for a fuel injection apparatus of an internal combustion engine

US8272856B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Walter Fuchs · Stuttgart, DE
• Andreas Dutt · Stuttgart, DE
• Jochen Aleker · Stuttgart, DE
• Arnold Gente · Stuttgart, DE
• Angelo Santamari · Eßlingen, DE

Key dates

• Filing date: Nov 15, 2006
• Grant date: Sep 25, 2012
• Expiry date: May 28, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7928
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The high-pressure pump has at least one pump element which has a pump plunger which is driven in a reciprocating motion and defines a pump working space into which fuel is drawn in from a fuel feed via an inlet valve during the suction stroke of the pump plunger and from which fuel is displaced into a high-pressure region via an outlet valve during the delivery stroke of the pump plunger. The inlet valve and/or the outlet valve has a valve member at least approximately in the shape of a ball which acts as a sealing surface with a valve seat arranged in a valve housing. The valve member, in its open state, is lifted with its sealing surface from the valve seat, a first cross section of flow is cleared between the valve member and the valve seat, and downstream of the first cross section of flow, a second cross section of flow is formed between the valve member and the valve housing. In the direction of flow between the first cross section of flow and the second cross section of flow, a third cross section of flow is formed between the valve member and the valve housing, said third cross section of flow being larger than the first cross section of flow and the second cross section of…