High-pressure pump with an on-off valve for feeding fuel to an internal combustion engine

US6553971B1 · kind B1 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Werner Banzhaf · Sindelfingen, DE
• Peter Grabert · Modugno, IT
• Nicola Cimaglia · Putignano, IT

Key dates

• Filing date: Jun 30, 2000
• Grant date: Apr 29, 2003
• Expiry date: Jan 24, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B49/22
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The pump has a body including at least a fuel compression chamber and an actuating chamber enclosing the actuating members of the pump. The on-off valve has a shutter sliding inside a hole in the body to close a fuel feed conduit. The shutter is held in the closed position by a compression spring, which rests directly or indirectly on a shoulder in the hole. In one embodiment, the spring rests on the shoulder via a perforated disk held by a retaining ring, which clicks removably inside an annular groove in the hole. In a further embodiment, the spring rests directly on the shoulder.