US20020057166A1 - Current coil - Google Patents
Current coil Download PDFInfo
- Publication number
- US20020057166A1 US20020057166A1 US09/486,046 US48604600A US2002057166A1 US 20020057166 A1 US20020057166 A1 US 20020057166A1 US 48604600 A US48604600 A US 48604600A US 2002057166 A1 US2002057166 A1 US 2002057166A1
- Authority
- US
- United States
- Prior art keywords
- coil
- wire
- connecting contact
- coil body
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004804 winding Methods 0.000 claims abstract description 32
- 239000000446 fuel Substances 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000004831 Hot glue Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 229910000679 solder Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- 238000005476 soldering Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
- G01D11/245—Housings for sensors
Definitions
- 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.
- 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.
- 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.
- a wire-guiding body is also provided which is slid onto the connecting contact wires on the coil body and therefore fixes them in position.
- the known current coil 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.
- the current coil according to the invention has the advantage over the prior art that the current coil can be automatically produced, automatically soldered, and then can be additionally extrusion coated so that all of the wires and windings are fixed in such a way that they can no longer move or be damaged during transport of the current coils or their installation into a needle motion sensor.
- the coil body of the current coil according to the invention has been provided with a particular wire guide, preferably the form of a formed groove, which permits the connecting contact wires that are preferably embodied as formed wire to be pressed into this formed groove. Due to the shaping of the formed groove, preferably as a groove profile, permits the connecting contact wire can be fixed immediately upon insertion into the formed groove.
- the shape of the connecting contact wire thereby produces a secure fixing in all directions and permits high securing forces to be achieved.
- the connecting contact wires are each provided with a tension relief loop and are inserted into the formed groove, which preferably is embedded completely in the coil body and permits a length compensation of the connecting contact wire.
- Another tension relief loop is advantageously provided at the ends of the coil winding wire before it is fastened to the connecting contact wire.
- These ends of the coil winding wire are advantageously guided to fixing lugs of the coil body.
- the connecting section between the ends of the coil winding wire to the connecting contact wires takes place by their being guided in a corresponding groove that extends obliquely to the axis of the coil body.
- the coil body is also encompassed with a plastic material, preferably a hot glue.
- the current coil according to the invention can be produced in an automated fashion.
- the connecting contact wires which are embodied as formed wires, are first pressed into the corresponding formed grooves on the coil body with a tension relief loop and with radially protruding wire ends.
- the coil wire is then automatically wound, wherein the coil wire beginning and the coil wire end are wound by the winding machine onto the radially protruding ends of the connecting contact wires.
- the two wire ends are preferably soldered to each other in a solder bath. Then the connecting contact wire ends are bent inward toward the coil body. This produces the relief loops at the ends of the coil winding wire, which are each aligned with a fixing lug and are fixed.
- the current coil is then completely extrusion coated with a plastic material, preferably hot glue.
- This new manufacturing process for current coils has the advantage that the manufacturing process, which can now be automated, can achieve a degree of high manufacturing reliability. Furthermore, in particular the soldering process by means of immersion is especially advantageous.
- the additional extrusion coating of the current coil with a plastic also produces a high degree of security against unintentional changes to the winding wire position during transport or installation of the current coil.
- the closed plastic cover offers an additional protection of the coil region and the soldering points from damaging environmental influences.
- FIG. 1 is a complete sectional depiction of the current coil
- FIG. 2 is a view that is rotated by 90° in relation to FIG. 1,
- FIG. 3 is a front view of the coil body with formed grooves disposed in it.
- FIGS. 4 and 5 show partial sectional views of the current coil during different manufacturing stages.
- FIGS. 1 to 5 show different views and manufacturing stages of an exemplary embodiment of the current coil according to the invention.
- 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.
- 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 are each connected to an end of a connecting contact wire 13 .
- These connecting contact wires 13 are respectively pressed into a formed groove 15 (see FIG. 3) provided in the coil body 1 , wherein a tension relief loop 17 is provided on each of the connecting contact wires 13 and is completely embedded in the cover of the coil body 1 .
- the connecting contact wires 13 protrude axially from the coil body 1 and consequently constitute an electrical contact point for a separate electric connecting line.
- fixing lugs 19 are also provided on the coil body 1 , which secure the wire ends 9 in position.
- the coil body 1 has a radially protruding annular flange 20 with which the coil body 1 is fixed to the fuel injection valve in a receiving bore of the valve holding body.
- the coil body 1 is also covered on its radial circumference surface by a plastic material, preferably a hot glue 21 , which encloses all of the wire components and contact points of the current coil with the exception of the connecting points of the connecting contact wires 13 .
- the connecting contact wires 13 which are embodied as formed wires, are pressed into the corresponding formed grooves 15 of the coil body 1 , wherein a tension relief loop 17 is provided.
- the wire ends 23 of the connecting contact wires 13 oriented toward the coil winding 7 thereby initially protrude radially from the coil body 1 .
- the coil wire is then wound onto the coil body 1 to produce the coil winding 7 .
- the ends 9 of the coil winding wire 7 are each fastened to a protruding end 23 of the connecting contact wires 13 .
- these wire contact points between coil winding wire ends 9 and connecting contact wire ends 23 are soldered to each other, preferably in a solder bath. Then, the protruding wire ends 23 are correspondingly shortened and are bent radially inward in the direction of the coil body 1 . This bending inward produces the tension relief loops of the coil winding wire ends 9 , which are then fixed in position on the fixing lugs 19 .
- the wire-guiding regions of the current coil are completely extrusion coated with a plastic, preferably a hot glue.
- the current coil according to the invention is used to detect the axial motion of a valve needle of a fuel injection valve but can alternatively also be employed for other typical uses.
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
- 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 coil body and therefore fixes them in position.
- 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.
- The current coil according to the invention, with the characterizing features of
claim 1, has the advantage over the prior art that the current coil can be automatically produced, automatically soldered, and then can be additionally extrusion coated so that all of the wires and windings are fixed in such a way that they can no longer move or be damaged during transport of the current coils or their installation into a needle motion sensor. The coil body of the current coil according to the invention has been provided with a particular wire guide, preferably the form of a formed groove, which permits the connecting contact wires that are preferably embodied as formed wire to be pressed into this formed groove. Due to the shaping of the formed groove, preferably as a groove profile, permits the connecting contact wire can be fixed immediately upon insertion into the formed groove. The shape of the connecting contact wire thereby produces a secure fixing in all directions and permits high securing forces to be achieved. The connecting contact wires are each provided with a tension relief loop and are inserted into the formed groove, which preferably is embedded completely in the coil body and permits a length compensation of the connecting contact wire. Another tension relief loop is advantageously provided at the ends of the coil winding wire before it is fastened to the connecting contact wire. These ends of the coil winding wire are advantageously guided to fixing lugs of the coil body. The connecting section between the ends of the coil winding wire to the connecting contact wires takes place by their being guided in a corresponding groove that extends obliquely to the axis of the coil body. In order to completely fix the wires in position and to secure them against an unintended movement, the coil body is also encompassed with a plastic material, preferably a hot glue. - In a particularly advantageous manner, the current coil according to the invention can be produced in an automated fashion. The connecting contact wires, which are embodied as formed wires, are first pressed into the corresponding formed grooves on the coil body with a tension relief loop and with radially protruding wire ends. In another process step, the coil wire is then automatically wound, wherein the coil wire beginning and the coil wire end are wound by the winding machine onto the radially protruding ends of the connecting contact wires. In another process step, the two wire ends are preferably soldered to each other in a solder bath. Then the connecting contact wire ends are bent inward toward the coil body. This produces the relief loops at the ends of the coil winding wire, which are each aligned with a fixing lug and are fixed. In another work step, the current coil is then completely extrusion coated with a plastic material, preferably hot glue.
- This new manufacturing process for current coils has the advantage that the manufacturing process, which can now be automated, can achieve a degree of high manufacturing reliability. Furthermore, in particular the soldering process by means of immersion is especially advantageous. The additional extrusion coating of the current coil with a plastic also produces a high degree of security against unintentional changes to the winding wire position during transport or installation of the current coil. In addition, the closed plastic cover offers an additional protection of the coil region and the soldering points from damaging environmental influences.
- Other advantages and advantageous embodiments of the subject of the invention can be inferred the from the drawings, the description, and the claims.
- An exemplary embodiment of the current coil according to the invention is shown in the drawings and will be described in detail in the description that follows.
- FIG. 1 is a complete sectional depiction of the current coil,
- FIG. 2 is a view that is rotated by 90° in relation to FIG. 1,
- FIG. 3 is a front view of the coil body with formed grooves disposed in it, and
- FIGS. 4 and 5 show partial sectional views of the current coil during different manufacturing stages.
- 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. Ametallic coil core 3 is inserted into one end of thecoil body 1 and on its outer end, has aconical opening 5 which transitions into a conical opening on thecoil 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 themetallic coil core 3, a coil winding 7 is mounted onto thecoil body 1 coaxial to thecoil core 3. Theends 9 of the coil winding wire of the coil winding 7, forming a tension relief loop by way of anoblique groove 11 in thecoil body 1, are each connected to an end of a connectingcontact wire 13. These connectingcontact wires 13 are respectively pressed into a formed groove 15 (see FIG. 3) provided in thecoil body 1, wherein atension relief loop 17 is provided on each of the connectingcontact wires 13 and is completely embedded in the cover of thecoil body 1. On their ends remote from the coil winding 7, the connectingcontact wires 13 protrude axially from thecoil body 1 and consequently constitute an electrical contact point for a separate electric connecting line. For a better guidance and fixing of theloop ends 9 of the coil winding wire of the coil winding 7, fixinglugs 19 are also provided on thecoil body 1, which secure thewire ends 9 in position. Furthermore, thecoil body 1 has a radially protrudingannular flange 20 with which thecoil body 1 is fixed to the fuel injection valve in a receiving bore of the valve holding body. For the reliable position fixing of the coil winding wire and the connectingcontact wires 13, thecoil body 1 is also covered on its radial circumference surface by a plastic material, preferably ahot glue 21, which encloses all of the wire components and contact points of the current coil with the exception of the connecting points of the connectingcontact wires 13. - The process according to the invention for producing the current coil according to the invention will now be explained in detail with the aid of the partial sectional depictions of FIGS.3 to 5. First, the connecting
contact wires 13, which are embodied as formed wires, are pressed into the corresponding formedgrooves 15 of thecoil body 1, wherein atension relief loop 17 is provided. The wire ends 23 of the connectingcontact wires 13 oriented toward the coil winding 7 thereby initially protrude radially from thecoil body 1. In another work step, the coil wire is then wound onto thecoil body 1 to produce the coil winding 7. Then theends 9 of thecoil winding wire 7 are each fastened to a protrudingend 23 of the connectingcontact wires 13. In another work step, these wire contact points between coil windingwire ends 9 and connectingcontact wire ends 23 are soldered to each other, preferably in a solder bath. Then, theprotruding wire ends 23 are correspondingly shortened and are bent radially inward in the direction of thecoil body 1. This bending inward produces the tension relief loops of the coil windingwire ends 9, which are then fixed in position on thefixing lugs 19. In a last work step, the wire-guiding regions of the current coil are completely extrusion coated with a plastic, preferably a hot glue. - The current coil according to the invention is used to detect the axial motion of a valve needle of a fuel injection valve but can alternatively also be employed for other typical uses.
Claims (6)
1. The current coil, preferably for a needle motion sensor for fuel injection valves, with a cylindrical coil body (1), which has a metallic coil core (3) inserted into its one end, which is coaxially encompassed by a coil winding (7) mounted on the coil body (1), wherein the ends (9) of the coil winding wire are each connected with a connecting contact wire (13) which, on the other end, can be connected to an electric connecting line, characterized in that the connecting contact wires (13) are each pressed into a formed groove (15) provided on the coil body (1).
2. The current coil according to claim 1 , characterized in that a tension relief loop (17) is provided on the connecting contact wires (13), which is completely disposed inside the coil body (1) and permits a length compensation on the connecting contact wire (13).
3. The current coil according to claim 1 , characterized in that the coil winding wire has a tension relief loop on its fastening ends (9) to the connecting contact wire (13).
4. The current coil according to claim 1 , characterized in that the ends (9) of the coil winding wire are guided in an obliquely extending guide groove (11) of the coil body (1).
5. The current coil according to claim 1 , characterized in that at least in the vicinity of the connecting contact wires (13) and the coil winding wire, the coil body (1) is completely enclosed on its radial circumference surface by a plastic material, preferably a hot glue.
6. A process for producing a current coil according to claim 1 , characterized by means of the following process steps:
the connecting contact wires (13) , which are embodied as formed wires, are pressed into corresponding formed grooves (15) on the coil body (1), with the provision of a relief loop (17) and with radially protruding wire ends (23), the coil wire (7) is wound onto the coil body (1), the ends (9) of the coil winding wire are each fastened to a protruding end (23) of the connecting contact wires (13),
the wire contact points between coil winding wire ends (9) and connecting contact wire ends (23) are soldered, preferably in a solder bath,
the protruding wire ends (23) of the connecting contact wires (13) are bent in the direction of the coil body (1),
the wire-guiding regions of the current coil are completely extrusion coated with a plastic material.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE29810989.1 | 1998-06-19 | ||
DE29810989U | 1998-06-19 | ||
DE29810989U DE29810989U1 (en) | 1998-06-19 | 1998-06-19 | Current coil |
PCT/DE1999/001662 WO1999067600A1 (en) | 1998-06-19 | 1999-06-08 | Current coil |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020057166A1 true US20020057166A1 (en) | 2002-05-16 |
US6392520B1 US6392520B1 (en) | 2002-05-21 |
Family
ID=8058771
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/486,046 Expired - Fee Related US6392520B1 (en) | 1998-06-19 | 1999-06-08 | Current coil |
Country Status (5)
Country | Link |
---|---|
US (1) | US6392520B1 (en) |
EP (1) | EP1031012B1 (en) |
JP (1) | JP2002519626A (en) |
DE (2) | DE29810989U1 (en) |
WO (1) | WO1999067600A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19843519A1 (en) * | 1998-09-23 | 2000-04-06 | Imi Norgren Herion Fluidtronic Gmbh & Co Kg | Valve solenoid |
DE102008064876B3 (en) * | 2008-05-30 | 2017-08-17 | Rausch & Pausch Gmbh | Assembly for an electromagnetic device |
DE102008026125C5 (en) * | 2008-05-30 | 2024-01-04 | Rapa Automotive Gmbh & Co. Kg | Spring-loaded piston accumulator with locking function |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2192165A (en) * | 1936-08-31 | 1940-02-27 | George D Ladd | Electrical connector |
DE3840339A1 (en) * | 1988-11-30 | 1990-05-31 | Bosch Gmbh Robert | FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES |
DE4438763A1 (en) * | 1994-10-29 | 1996-05-02 | Vdo Schindling | Sensor e.g. motor vehicle or machine rotational speed sensor |
-
1998
- 1998-06-19 DE DE29810989U patent/DE29810989U1/en not_active Expired - Lifetime
-
1999
- 1999-06-08 EP EP99936422A patent/EP1031012B1/en not_active Expired - Lifetime
- 1999-06-08 JP JP2000556210A patent/JP2002519626A/en active Pending
- 1999-06-08 DE DE59909328T patent/DE59909328D1/en not_active Expired - Lifetime
- 1999-06-08 US US09/486,046 patent/US6392520B1/en not_active Expired - Fee Related
- 1999-06-08 WO PCT/DE1999/001662 patent/WO1999067600A1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
WO1999067600A1 (en) | 1999-12-29 |
US6392520B1 (en) | 2002-05-21 |
EP1031012B1 (en) | 2004-04-28 |
DE59909328D1 (en) | 2004-06-03 |
EP1031012A1 (en) | 2000-08-30 |
JP2002519626A (en) | 2002-07-02 |
DE29810989U1 (en) | 1999-11-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ROBERT BOSCH GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HOFMANN, KARL;HAFNER, MARTIN;ZUCKER, ROLAND;REEL/FRAME:010810/0120 Effective date: 20000416 |
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FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20060521 |