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US 7,070,128 B2Granted
Fuel injection valve
AssigneeRobert Bosch GmbH
InventorZlatko Delas
Life of this patent
Estimating the term…
Abstract
A fuel injector includes a magnetic coil, which cooperates with an armature acted upon by a restoring spring, the armature forming an axially movable valve part together with a valve needle. A valve-closure member which forms a sealing seat with a valve-seat member is provided at the valve needle. Furthermore, the fuel injector includes an inner pole and an outer pole which form a magnetic circuit with the magnetic coil. The restoring spring is acted upon by a guide sleeve so that its axial length during operation of the fuel injector is smaller than the axial length of a bore of the inner pole.
Claims5
A fuel injector, comprising:
- a valve needle having an axial opening;
- a guide sleeve inserted in the axial opening;
- an armature and the valve needle together forming an axially movable part;
- a magnetic coil having an inner pole and cooperating with the armature;
- a restoring spring arranged to rest against the guide sleeve and to act upon the armature;
- a valve-seat member;
- and
- a valve-closure member provided at the valve needle, the valve-closure member forming a sealing seat with the valve seat member,
- wherein the guide sleeve has a tubular shaft in an area of the valve needle and armature, and a guide section in a region of the inner pole, the guide section arranged as a sphere-segment.
6 more elements
Dependencies are inferred from the claim text.