Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
  • H01F38/12—Ignition, e.g. for IC engines
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
  • H01F38/12—Ignition, e.g. for IC engines
  • H01F2038/122—Ignition, e.g. for IC engines with rod-shaped core
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/32—Insulating of coils, windings, or parts thereof
  • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures

Definitions

• Bar ignition transformer for supplying an ignition means, in particular a spark plug of an internal combustion engine, with a high voltage
• the invention relates to a Stabzünd transformer for supplying an ignition means with high voltage.
• the rod ignition transformer has a main core region about which a first inner winding and a second outer winding are arranged concentrically with the longitudinal axis of the rod ignition transformer.
• One of the windings is a primary winding and the other winding is a secondary winding.
• Stabzündtransformatoren are known in which the transformer core is connected to a ground potential of the motor vehicle, whereby the transformer core has this ground potential.
• the primary coil is arranged inside coaxially around the transformer core around and the secondary coil is arranged externally around the primary coil around coaxially, wherein the secondary coil is surrounded by a jacket of insulating material outside.
• bar ignition transformers are known in which the secondary coil is arranged on the inside around the transformer core.
• the primary coil is arranged externally around the secondary coil, whereby these bar-type ignition transformers are also referred to as external secondary coil-bar transformers.
• the transformer core is electrically connected to no potential, so that the potential of the transformer core due to a capacitive coupling to a center potential between the ground potential and the generated high voltage potential.
• the insulating material of the insulating jacket is at least locally heavily stressed by arranged in the vicinity of the insulating potential-carrying components.
• the known Stabzündtransformatoren generally have the disadvantage that the insulating materials used are heavily loaded locally uneven. However, the insulation capacity of the insulating material and the thickness of the insulating material must be designed according to the maximum load occurring. In addition, in a skew winding of the primary winding and / or the secondary winding by design measures the slippage of individual wires must be prevented. When skew winding, only a part of the cylindrical position of a coil winding is wound with a winding wire, with the following then se layer generated further layer is not wound back to the beginning of the first layer. The subsequently wound on the second layer third layer has the same width as the first layer, so that it is arranged offset from the first layer.
• skew windings are also referred to as crawl windings and are particularly useful in manuals for winding machines, e.g. from winding machines of the company Marsilli described.
• the object of the invention is to provide a bar ignition transformer for supplying an ignition means, in particular a spark plug of an internal combustion engine, with a high voltage, in which the load of the insulating material for the isolation of the secondary coil is reduced.
• a Stabzündtransformator for supplying an ignition means, in particular a spark plug of an internal combustion engine with high voltage ensures that in the range of large potential differences, a thicker insulating material is available than in areas with lower potential differences.
• the insulating material for the isolation of the secondary coil is subjected to less stress than conventional Stabzündtransformatoren. Pointy heavy loads of the insulating material are avoided. These strong punctual loads are caused by large local potential differences, which are also referred to as hot spots. In areas of such hot spots, the insulating material is heavily stressed.
• the insulation of the entire Stabzündtransformators is designed for these hot spots, so that in areas with lower potential differences more insulating material is present than is necessary for the isolation of the high-voltage components of the pencil ignition coil.
• the insulation material is heavily stressed, whereby the life of the isolate onsmaterials especially at these hot spots is reduced by the stress.
• a second aspect of the invention relates to an arrangement with a combined Zündtransformator- and Zündffenech, preferably for an internal combustion engine that operates on the Otto principle.
• the arrangement has an ignition means which has an insulating body between a spark gap formed by means of electrodes and a high voltage terminal.
• the cross section of the insulating material decreases at least in the region of the secondary winding of the ignition transformer with increasing distance from the electrodes of the ignition means.
• the secondary winding and the primary winding of the ignition transformer are arranged concentrically to the longitudinal axis of the insulating material.
• the insulating body serves as a bobbin for the secondary coil of the ignition transformer.
• a conical design and arrangement of the secondary coil of the ignition transformer is achieved in a simple manner.
• Fig. 2 shows a detail of a longitudinal section of an inventive
• FIG. 3 is a side view of an ignition transformer / spark plug assembly according to the present invention.
• FIG. 4 shows a sectional view of the ignition transformer spark plug unit along the section line A - A according to FIG. 3.
• Fig. 1 a section of a known Stabzündtransformators is shown.
• Stabzündtransformatoren are known for example from the documents DE 199 12 376 C2, DE 103 60 338 A1, DE 109 211 A1, DE 102 56 802 D3, DE 199 02 497 A1, DE 129 27 820 C1 and DE 136 528 A1.
• the drive circuits disclosed in these documents as well as the structure of bar ignition transformers disclosed in these documents are hereby incorporated by reference into the present specification.
• a Stabzündtransformator 10 is shown, which is designed for connection to a spark plug, not shown, wherein the Stabzündtransformator 10 in the region 12 has an opening for receiving a terminal portion of a spark plug. At least the lower portion of the Stabzündtransformators 10 is inserted into a provided in a cylinder head of an internal combustion engine shaft.
• the rod-firing transformer 10 includes a substantially cylindrical rod core 14 formed of soft magnetic iron or a magnetic material and extending along the longitudinal axis 11 of the rod ignition transformer 10.
• a secondary winding 16 is arranged on a bobbin 18 coaxially around the rod core 14. A winding end of the secondary winding 16 is connected to the mass of the motor vehicle serving as a reference potential.
• the other terminal of the secondary winding 16 is connected to a high voltage terminal 18 of a spark plug.
• a spark plug In Fig. 1, the potentials and the shown connections of the coils and the spark plug only schematically outside the Stabzündtransformators 10.
• the gaps between the primary winding 22, the secondary winding 16 and the bobbin 18 are preferably shed with an insulating material.
• On the insulating housing 24 may be present a return plate, which forms a magnetic circuit of the Stabzündtransformators 10 as a return element with the rod core 14. If the rod core 14 is also connected to the ground potential, the secondary winding 16 must be insulated from the rod core 14 accordingly.
• the bobbin 18 is made of a plastic, by which the secondary winding 16 is sufficiently insulated from the rod core 14.
• a potting compound may be filled between the bobbin 18 and the rod core 14.
• the secondary winding 16 is electrically insulated from the primary winding 22 by the casting compound filled between these windings 16, 22.
• the secondary winding 16, the primary winding 22, the rod core 14 and / or the housing 24 may be electrically insulated with a thermoplastic and / or a thermosetting material.
• the thermoplastic or thermoset material is preferably applied to the component to be insulated 16, 22, 14, 24 by a spraying method. !
• the power output stage of the control unit 26 comprises a high-power transistor, which is operated as a switch.
• Such high-power transistors are in particular bipolar transistors, MOSFETs and insulated gate bipolar transistors (IGBT).
• FIG. 2 shows a rod ignition transformer 30 according to the invention, whose structure and mode of operation are similar to the rod ignition transformer 10 according to FIG. Like elements have the same reference numerals.
• the rod core 14 in the present embodiment has a circular cross-section and extends along the longitudinal axis of the Stabzündtransformators 30.
• the secondary winding 32 is designed as a skew winding, wherein the winding process at the upper end of the secondary winding 32 shown in FIG. 2 has been started.
• the secondary winding 32 and the primary winding 22 are arranged radially about the longitudinal axis 11 of the pencil ignition coil 30.
• the radial cross section of the secondary winding 32 increases from the upper end of the secondary winding 32 to the lower end of the secondary winding 32 toward, so that the distance of the secondary winding 32 to the lateral surface of the rod core 14 from the upper end to the lower end of the secondary winding 32 increases continuously. As a result, the isolation distance between the The lateral surface of the rod core 14 and the secondary winding 32 increases continuously.
• the potential distribution of the secondary winding 32 from the lower end to the upper end takes place substantially uniformly over the length of the secondary winding 32, so that ground potential is present at the lower end and high-voltage potential at the upper end.
• the rod core 14 is electrically connected to the high voltage potential.
• the potential difference is equal to the high voltage potential of the rod core 14, since this end of the secondary winding 32 is at ground potential.
• the secondary winding 32 Due to the oblique arrangement of the secondary winding 32, however, a relatively large distance between the inside of the secondary winding 32 and the lateral surface of the rod core 14 at the lower end of the secondary winding 32 is present, which serves as an isolation distance. In this isolation distance either air or another insulating material, in particular an insulating resin, may be present. The introduction of insulating gases in this space is possible.
• the flow behavior of a potting compound in a vacuum potting process with respect to the rod ignition transformer 10 is provided by the funnel-shaped gap between the secondary winding 32 and the primary winding 22 the rod ignition transformer 30 of FIG. 2 improved, whereby existing residual gases can better ascend from the spaces in the Stabzündtransformator 30.
• the secondary winding 32 is designed as a skew winding, wherein the skew winding in the region with the smallest inner cross section of the secondary winding 32 is started, so that the winding direction of the skew winding is directed against the conicity of the secondary winding 32.
• the Konizticianswinkel and the skew angle are added, whereby adjacent turns have a lower potential difference than, for example, in cylinder windings.
• the lacquer insulation of the winding wires is thereby not stressed so much, whereby a longer life of the enameled wire insulation is achieved and the probability of Windungs finallyn is reduced. Furthermore, thereby slipping of wires in the skew winding is prevented.
• FIG. 3 is a side view of a Stabzündtransformator- spark plug combination 40 according to the invention is shown.
• the Stabzündtransformator spark plug combination 40 has a Isolierstoffgeophuse 48, at the top of a hexagonal engagement portion 50 for screwing the Stabzündtransformator- spark plug combination 40 in a threaded opening in a cylinder head of a motor vehicle and to suit the pencil coil spark plug combination 40 with a prescribed torque is provided.
• In the middle of the hexagonal engagement area there is an opening for inserting a connecting line. provided electrically connecting the rod transformer-spark plug combination 40 with the control unit 26 for driving the rod transformer electrically.
• an external thread 42 for screwing into a spark plug opening in the cylinder head of the motor vehicle Ci-. From the bottom of the external thread 42 projects a high-voltage electrode 44 and a counter electrode 46.
• the external thread 42 is preferably made of a metallic material, whereby the Stabzündtransformator- spark plug combination 40 is preferably connected via this external thread 42 to the ground potential of the motor vehicle when the external thread 42 is screwed into the metallic cylinder head.
• the counter electrode 46 is electrically connected to the external thread 42 and thus to the ground potential of the motor vehicle.
• FIG. 4 is a sectional view of the Stabzündtransformator spark plug combination 40 along the section line A-A shown in FIG. 3.
• a primary winding 52 is arranged on the inner wall of the insulating housing 48.
• the high voltage electrode 44 is electrically connected to a transformer core 54, the transformer core 54 and the electrical connection between the transformer core 54 and the high voltage electrode 44 being surrounded by an insulating body 56, preferably made of ceramic or porcelain.
• the Isolierstoff Chemistry 56 serves as a bobbin for the secondary winding 58.
• the cross section of the Isolierstoff stresses 56 continuously decreases from the lower end of the secondary winding 58 to the upper end of the secondary winding 58 back, so that the distance between the lateral surface of the secondary winding 58th and the inside of the primary winding 52 increases continuously upward.
• the potential of the secondary winding 58 continuously increases from the lower end of the secondary winding 58 to the upper end of the secondary winding 58.
• the transformer core 54 is electrically connected to the high voltage potential of the secondary winding 58.
• Primary winding 52 has a DC potential or supply voltage potential of the motor vehicle so that a large potential difference between primary winding 52 and secondary winding 58 is present in the upper region of secondary winding 58 and a small potential difference between secondary winding 58 and primary winding 52 in the lower region of secondary winding 58 occurs.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Ignition Installations For Internal Combustion Engines (AREA)
• Spark Plugs (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37401128

Family Applications (1)

Country Status (7)

Families Citing this family (3)

Citations (4)

Family Cites Families (17)

• 2005
  • 2005-09-12 DE DE102005043336A patent/DE102005043336A1/de not_active Withdrawn
• 2006
  • 2006-09-12 EP EP06778426A patent/EP1929490B1/de not_active Not-in-force
  • 2006-09-12 JP JP2008530505A patent/JP2009508345A/ja active Pending
  • 2006-09-12 DE DE502006005995T patent/DE502006005995D1/de active Active
  • 2006-09-12 CN CN2006800414848A patent/CN101305431B/zh not_active Expired - Fee Related
  • 2006-09-12 WO PCT/EP2006/066281 patent/WO2007031518A1/de active Application Filing
  • 2006-09-12 AT AT06778426T patent/ATE456141T1/de active
• 2009
  • 2009-03-30 HK HK09102976.5A patent/HK1124955A1/xx not_active IP Right Cessation

Patent Citations (4)

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