Fuel injector

US6793159B2 · kind B2 · utility

Assignee

• Seimens Aktiengesellschaft · DE

Inventors

• Wolfgang Bloching · Tettnang, DE
• Willibald Schurz · Pielenhofen, DE

Key dates

• Filing date: Jun 18, 2003
• Grant date: Sep 21, 2004
• Expiry date: Jun 18, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/50
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The fuel injector comprises a control module, with a piston guide extending downwards, in which a control piston is arranged. The fuel injector further comprises a nozzle body, with a top surface on which the control module is mounted. The nozzle body comprises a drilling with a nozzle needle, co-operating with the control piston, arranged in the lower section thereof and the piston guide, arranged in the upper section thereof. A high pressure inlet is arranged in the control module and opens out into the drilling at the top surface. The drilling is embodied such that, on lifting the nozzle needle from the valve seat thereof, the fuel which escapes from the fuel injector is replaced, whereby fuel from the high pressure inlet flows through the drilling in the direction of the valve seat.