Injection nozzle

US5713326A · kind A · utility

Assignee

• Institut für Motorenbau Prof. Huber GmbH · DE

Inventor

• Gerd Huber · Birkenfeld, DE

Key dates

• Filing date: May 3, 1996
• Grant date: Feb 3, 1998
• Expiry date: May 3, 2016

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M63/0225
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An injection nozzle for use in a common-rail system includes a nozzle body with an actuator piston. In the closed condition of the nozzle the nozzle body bears against a seat and upstream of the seat delimits a nozzle chamber communicated with the high-pressure line of the common-rail system. A working chamber of the actuator piston is communicated with the high-pressure line by way of a feed throttle means, the active surface area of the actuator piston being larger than the surface area of the nozzle body which is effective in the nozzle chamber. A return line leads from the working chamber through a return valve. An actuating means is operated by an electrical signal for actuating the valve member of the return valve. The actuating means is a means which displaces the return valve member in analog relationship with the electrical signal so that the return valve forms in the return line a throttle of variable cross-section.