Pump device for high pressure fuel delivery in fuel injection system of internal combustion engines

US6126407A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Josef Guentert · Gerlingen, DE
• Bernd Streicher · Echterdingen, DE
• Uwe Kuhn · Riederich, DE
• Juergen Hammer · Fellbach, DE
• Thomas Lettner · Salzburg, AT

Key dates

• Filing date: May 28, 1999
• Grant date: Oct 3, 2000
• Expiry date: May 28, 2019

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M39/005
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a pump device for high-pressure fuel delivery in fuel injection systems of internal combustion engines, in particular in a common rail injection system, including a radial piston pump (2, 68, 80) with a drive shaft (38, 74, 114) that is supported in a pump housing (14) and is embodied eccentrically or has cam-like projections in the circumference direction, preferably with a number of pistons that are each disposed in a cylinder chamber radially in relation to the drive shaft and can be driven to reciprocate in the cylinder chamber when the drive shaft rotates, and with a check valve on the intake side and the high pressure side, and a low pressure pump (4, 71, 82) connected before the radial piston pump; in order to improve the pump device in such a way that it is more compact and can be produced more cheaply and the danger of the occurrence of leaks is reduced, the low pressure pump (4, 71, 82) is provided on or in the pump housing (14) of the radial piston pump (2, 68, 80), on the end remote from the drive end (10), and can be driven by the drive shaft (38, 74, 114) of the radial piston pump. (FIG. 1b)