Fuel injector

Patent metadata

Field	Value
Publication number	US-9353715-B2
Application number	US-201314408497-A
Country	US
Kind code	B2
Filing date	May 24, 2013
Priority date	Jun 20, 2012
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

A fuel injector for injecting fuel into an internal combustion engine includes: a housing having at least one spray orifice; a magnet armature movable linearly in the housing; a magnetic coil acting magnetically on the magnet armature; and a valve element movable linearly with respect to the housing and with respect to the magnet armature, the valve element, together with the at least one spray orifice, forming a valve seat, a first stop on the valve element, and a tension spring pulling the magnet armature against the first stop.

First claim

What is claimed is:

1. A fuel injector for injecting fuel into an internal combustion engine, comprising:
a housing having at least one spray orifice;
a magnet armature movable linearly in the housing;
a magnetic coil acting magnetically on the magnet armature;
a valve element movable linearly with respect to the housing and with respect to the magnet armature, wherein the valve element forms a valve seat together with the at least one spray orifice;
a first stop provided on the valve element; and
a tension spring pulling the magnet armature against the first stop.

2. The fuel injector as recited in claim 1 , wherein the magnet armature is lodged on the valve element.

3. The fuel injector as recited in claim 2 , wherein a first end of the tension spring is directly connected to the magnet armature, and the second end of the tension spring is directly connected to the first stop.

4. The fuel injector as recited in claim 2 , wherein a first contact surface on the magnet armature faces away from the combustion chamber, and the tension spring lies against the first contact surface.

5. The fuel injector as recited in claim 4 , wherein a second contact surface on the valve element faces the combustion chamber, and the tension spring lies against the second contact surface.

6. The fuel injector as recited in claim 5 , wherein an encircling groove for form-locking accommodation of the tension spring is provided in at least one of the first contact surface and the second contact surface.

7. The fuel injector as recited in claim 5 , wherein the tension spring is connected to at least one of the magnet armature and the valve element.

8. The fuel injector as recited in claim 5 , wherein the valve element includes a valve needle, and wherein the first stop is provided on a sleeve on the valve needle.

9. The fuel injector as recited in claim 5 , wherein the tension spring is a self-contracting spiral spring.

10. The fuel injector as recited in claim 5 , further comprising:
a closing pressure spring acting on the valve element in the closing direction.

Assignees

• Rogler Philipp
• Scheffel Martin
• Bosch Gmbh Robert

Inventors

• Rogler Philipp
• Scheffel Martin

Classifications

• F02M63/0075

  Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring · CPC title

• F02M61/20

  Closing valves mechanically, e.g. arrangements of springs or weights {or permanent magnets; Damping of valve lift} · CPC title

• F02M51/0671 Primary

  the armature having an elongated valve body attached thereto · CPC title

• F02M51/0625

  characterised by arrangement of mobile armatures · CPC title

• F02M51/0685 Primary

  the armature and the valve being allowed to move relatively to each other or not being attached to each other · CPC title