Radial pistol pump

US6224351A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Hans-Juergen Simon · Bad Liebenzell, DE
• Bernd Streicher · Echterdingen, DE

Key dates

• Filing date: Sep 13, 1999
• Grant date: May 1, 2001
• Expiry date: Sep 13, 2019

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M59/06
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines, particularly in a common rail injection system. A drive shaft is supported in a pump housing and is embodied as eccentric or has cam-like projections in the circumference direction. A number of pistons are each disposed in a respective element bore and are situated radially in relation to the drive shaft. The pistons can be set into a reciprocating motion in the radial direction inside the respective element bore through the rotation of the drive shaft in order to aspirate fuel by way of an intake conduit in which an intake valve is disposed. The fuel is aspirated into a cylinder chamber that is defined by the piston in the element bore and is connected to a high-pressure conduit in which a high-pressure valve is disposed. The element bore is disposed together with the intake conduit and the high-pressure conduit in an element head. The embodiment of the element bore as a blind hole from which the intake conduit and the high-pressure conduit lead achieves a reduction of the high-pressure sealing points.