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Current coil

a current coil and coil technology, applied in the direction of instruments, measurement device, measurement apparatus components, etc., can solve the problems of inability to automate, high labor intensity, and high labor intensity of the soldering process, and achieve the effect of reducing labor intensity, and avoiding the damage of current coils

Inactive Publication Date: 2002-05-16
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The known current coil, however, has the disadvantage that after the coil wire has been wound, the winding wire beginning and the winding wire end must be placed with a tension relief loop against the ends of the connecting contact wires and soldered there.
This soldering process therefore requires manual labor that is expensive for technical manufacturing reasons and cannot be automated.
Furthermore, the known current coil has the disadvantage that the windings and tension relief loops at the connections can easily shift during transport and installation of the current coil so that the current coil can be easily damaged, which requires more care to be exercised in the transport and installation of the current coil into the needle motion sensor.

Method used

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Embodiment Construction

[0012] FIGS. 1 to 5 show different views and manufacturing stages of an exemplary embodiment of the current coil according to the invention. First of all, the current coil according to the invention, which is shown completely in FIGS. 1 and 2, has a cylindrical coil body 1 made of plastic. This coil body is embodied of two parts and has a core part and a cover part that encompasses it. A metallic coil core 3 is inserted into one end of the coil body 1 and on its outer end, has a conical opening 5 which transitions into a conical opening on the coil body 1; a bolt-shaped magnet armature of the axially movable valve member (valve needle) of the fuel injection valve protrudes into this conical opening when the current coil is in its installed position. Furthermore, at the level of the metallic coil core 3, a coil winding 7 is mounted onto the coil body 1 coaxial to the coil core 3. The ends 9 of the coil winding wire of the coil winding 7, forming a tension relief loop by way of an obl...

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Abstract

A current coil is proposed, in particular for use in a needle motion sensor for a fuel injection valve, having a coil body (1), which is provided with a metallic coil core (3), wherein connecting contact wires (13) for the coil winding (7) are held pressed against the coil body in formed grooves (15) of the coil body.

Description

PRIOR ART[0001] The invention is based on current coil, preferably for use in a needle motion sensor for fuel injection valves, as generically defined by the preamble to claim 1. In a current coil of this type, which is known from WO 90 / 06439, a cylindrical coil body is inserted into a corresponding receiving opening of a valve holding body of a fuel injection valve and acts as a needle motion sensor there for detecting the motion of an axially movable valve needle of the fuel injection valve. For this purpose, the end of the coil body oriented toward the valve needle has a metallic coil core inserted into it, which is coaxially encompassed by a coil winding that is mounted onto the coil core. The ends of the coil winding wire are each connected to a respective connecting contact wire which on the other end, has connections for external electric connecting lines. In the known current coil, a wire-guiding body is also provided which is slid onto the connecting contact wires on the co...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01D11/24G01D11/00
CPCG01D11/245
Inventor HOFMANN, KARLHAFNER, MARTINZUCKER, ROLAND
Owner ROBERT BOSCH GMBH