GB2058473A - An ignition coil for ignition systems for combustion engines - Google Patents

An ignition coil for ignition systems for combustion engines Download PDF

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Publication number
GB2058473A
GB2058473A GB8026212A GB8026212A GB2058473A GB 2058473 A GB2058473 A GB 2058473A GB 8026212 A GB8026212 A GB 8026212A GB 8026212 A GB8026212 A GB 8026212A GB 2058473 A GB2058473 A GB 2058473A
Authority
GB
United Kingdom
Prior art keywords
coil
insulating member
sealing compound
iron core
ignition
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
Application number
GB8026212A
Other versions
GB2058473B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB2058473A publication Critical patent/GB2058473A/en
Application granted granted Critical
Publication of GB2058473B publication Critical patent/GB2058473B/en
Expired legal-status Critical Current

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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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/266—Fastening or mounting the core on casing or support
    • 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
    • H01F27/327—Encapsulating or impregnating

Landscapes

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

Abstract

The ignition coil has a cup-like insulating member (13) around one end of the coil unit (12) and in order to provide an insulating fixing therein of the coil unit (12), which is formed from a laminated iron core (15), a secondary winding (16) and a primary winding (17), a predetermined quantity of quartz sealing compound (14) is filled into the insulating member (13) and then the coil unit (12) is inserted so that the quartz sealing compound (14) surrounds the end section of the coil unit (12). Due to the quartz sealing compound (14) consisting of bitumen and quartz dust as a filler, the high tension strength is increased and due to the cup-like formation of the insulating member (13), the uniting of the joined portions is facilitated during mass production. The member (13) has a recess (23), a collar (26), an annular trough (27) and an outer rim (28), the trough (27) trapping the overflow of the sealing compound. The member (13) also has three feet (22) standing on a housing (10) of sheet steel. <IMAGE>

Description

SPECIFICATION An ignition coil for ignition systems for combustion engines With known types of ignition coils, the coil insert formed of an iron core, a secondary winding and a primary winding is fixed by means of a dispersion adhesive to an insulating member which is supported by the base of the housing of the ignition coil. The required high tension strength is achieved by a correspondingly large distance of the coil insert from the end of the iron core carrying the high tension.
However, a higher high tension strength between the iron core and the two windings in the region of the insulating member up to, for example, 45 thousand volts, is no longer possible with this dispersion adhesive and a greater distance between the coil insert and the insulating member with the same housing. The above described cementing also has the disadvantage during mass production that the excess amount of adhesive needs to be removed from the coil insert and the insulating member.
ADVANTAGES OF THE INVENTION An increased discharge strength in the dangerous region between the windings and the iron core is achieved with the ignition coil in accordance with the invention.
Advantageous further developments of the invention are described in the sub-claims. With the arrangement of the ignition coil according to claim 2, the removal of the excess amount of adhesive is avoided because the latter is trapped in an adhesive sump. With the arrangement of the ignition coil according to claim 3, the parts to be cemented can be associated without auxiliary means and in a predetermined manner. With the arrangement of the ignition coil according to claim 4, the desired increase in the high tension strength is achieved without any additional expenditure. It is preferable to use an asphalt, that is to say a quartz sealing compound according to claim 6, especially according to claim 7.
DRAWING An embodiment of the invention is illustrated in the drawing and is described in detail in the following specification. The single figure shows the axial section through an ignition coil in partial section and on an enlarged scale.
DESCRIPTION OF THE EMBODIMENT An ignition coil for ignition systems for combustion engines has a cup-like housing 10 made of sheet steel having a base 1 1, a coil insert 12 and an insulating member 13 which are both connected together in an insulating manner by means of a quartz sealing compound 14. The coil insert 12 consists of a laminated iron core 15, a secondary winding 1 6 surrounding the core concentrically and a primary winding 1 7. An end portion 1 8 of the iron core 1 5 projects beyond the end surface 1 9 of the inner winding 1 6. The end surface 20 of the outer winding 1 7 is set back in an axial direction and chamfered with respect to the end surface 1 9 so that the outer surface 30 of the winding 1 6 is partially exposed.The quartz sealing compound 14 is a mastic asphalt consisting of bitumen and quartz dust as a filler; in this base, the bitumen component amounts to 42 to 45 per cent by weight.
The insulating member 1 3 is made cup-like and has three supporting feet 22 at the base 11 of the housing 10. A recess 23 receiving the end portion 1 8 of the iron core 1 5 is arranged in the portion 20, the wall 24 of the recess widening towards its open end. A flange 25 cooperating with the end surface 19 of the secondary winding 1 6 extends from the wall 24 and changes into a collar 26 centering the coil insert 12. A deeper annular trough 27 and an axially directed outer rim 28 extend from the collar 26.
In order to fix the coil insert 12 in the insulating member 13, a predetermined quantity of quartz sealing compound 14 is filled into its recess 23; then the coil insert 1 2 is connected to the insulating member 13 as illustrated in the direction of the arrow 29, so that the quartz sealing compound 14 overflows the collar 26 into the annular trough 27 and is trapped by the outer rim 28. In so doing, the sealing compound surrounds the end portion 1 8 of the iron core 1 5, the end surface 19 and partially the exposed outer surface 30 of the secondary winding 1 6.
1. An ignition coil for ignition systems for combustion engines with the following features: a)bn insulating member is supported on the base of a cup-like housing, b) a coil insert consists of an iron core, a secondary winding concentrically surrounding the core and a primary winding, c) the coil insert and the insulating member are connected to one another in an insulating manner by means of a quartz sealing compound.
2. A coil according to claim 1 with the following feature: d) the insulating member has an axially directed outer rim.
3. A coil comprising a projecting end portion of the iron core according to claim 1 or 2, with the following features: e) the insulating member has a recess receiving the end portion and f) a collar for centering the inner winding.
4. A coil according to one of the preceding claims with the following features: g) the outer winding is axially shortened so that the exposed outer surface of the inner winding is at least partially surrounded by the quartz sealing compound.
5. An ignition coil according to claim 2 or 3 with the following feature: h) the recess receiving the end portion of the iron core widens towards its open end.
6. A coil according to one of the preceding claims with the following feature:
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION An ignition coil for ignition systems for combustion engines With known types of ignition coils, the coil insert formed of an iron core, a secondary winding and a primary winding is fixed by means of a dispersion adhesive to an insulating member which is supported by the base of the housing of the ignition coil. The required high tension strength is achieved by a correspondingly large distance of the coil insert from the end of the iron core carrying the high tension. However, a higher high tension strength between the iron core and the two windings in the region of the insulating member up to, for example, 45 thousand volts, is no longer possible with this dispersion adhesive and a greater distance between the coil insert and the insulating member with the same housing. The above described cementing also has the disadvantage during mass production that the excess amount of adhesive needs to be removed from the coil insert and the insulating member. ADVANTAGES OF THE INVENTION An increased discharge strength in the dangerous region between the windings and the iron core is achieved with the ignition coil in accordance with the invention. Advantageous further developments of the invention are described in the sub-claims. With the arrangement of the ignition coil according to claim 2, the removal of the excess amount of adhesive is avoided because the latter is trapped in an adhesive sump. With the arrangement of the ignition coil according to claim 3, the parts to be cemented can be associated without auxiliary means and in a predetermined manner. With the arrangement of the ignition coil according to claim 4, the desired increase in the high tension strength is achieved without any additional expenditure. It is preferable to use an asphalt, that is to say a quartz sealing compound according to claim 6, especially according to claim 7. DRAWING An embodiment of the invention is illustrated in the drawing and is described in detail in the following specification. The single figure shows the axial section through an ignition coil in partial section and on an enlarged scale. DESCRIPTION OF THE EMBODIMENT An ignition coil for ignition systems for combustion engines has a cup-like housing 10 made of sheet steel having a base 1 1, a coil insert 12 and an insulating member 13 which are both connected together in an insulating manner by means of a quartz sealing compound 14. The coil insert 12 consists of a laminated iron core 15, a secondary winding 1 6 surrounding the core concentrically and a primary winding 1 7. An end portion 1 8 of the iron core 1 5 projects beyond the end surface 1 9 of the inner winding 1 6. The end surface 20 of the outer winding 1 7 is set back in an axial direction and chamfered with respect to the end surface 1 9 so that the outer surface 30 of the winding 1 6 is partially exposed.The quartz sealing compound 14 is a mastic asphalt consisting of bitumen and quartz dust as a filler; in this base, the bitumen component amounts to 42 to 45 per cent by weight. The insulating member 1 3 is made cup-like and has three supporting feet 22 at the base 11 of the housing 10. A recess 23 receiving the end portion 1 8 of the iron core 1 5 is arranged in the portion 20, the wall 24 of the recess widening towards its open end. A flange 25 cooperating with the end surface 19 of the secondary winding 1 6 extends from the wall 24 and changes into a collar 26 centering the coil insert 12. A deeper annular trough 27 and an axially directed outer rim 28 extend from the collar 26. In order to fix the coil insert 12 in the insulating member 13, a predetermined quantity of quartz sealing compound 14 is filled into its recess 23; then the coil insert 1 2 is connected to the insulating member 13 as illustrated in the direction of the arrow 29, so that the quartz sealing compound 14 overflows the collar 26 into the annular trough 27 and is trapped by the outer rim 28. In so doing, the sealing compound surrounds the end portion 1 8 of the iron core 1 5, the end surface 19 and partially the exposed outer surface 30 of the secondary winding 1 6. CLAIMS
1. An ignition coil for ignition systems for combustion engines with the following features: a)bn insulating member is supported on the base of a cup-like housing, b) a coil insert consists of an iron core, a secondary winding concentrically surrounding the core and a primary winding, c) the coil insert and the insulating member are connected to one another in an insulating manner by means of a quartz sealing compound.
2. A coil according to claim 1 with the following feature: d) the insulating member has an axially directed outer rim.
3. A coil comprising a projecting end portion of the iron core according to claim 1 or 2, with the following features: e) the insulating member has a recess receiving the end portion and f) a collar for centering the inner winding.
4. A coil according to one of the preceding claims with the following features: g) the outer winding is axially shortened so that the exposed outer surface of the inner winding is at least partially surrounded by the quartz sealing compound.
5. An ignition coil according to claim 2 or 3 with the following feature: h) the recess receiving the end portion of the iron core widens towards its open end.
6. A coil according to one of the preceding claims with the following feature: i) the quartz sealing compound consists of bitumen and quartz dust as a filler.
7. A coil according to claim 6 with the following feature: j) the quartz sealing compound has a bitumen component of substantially 42 to 45 percent by weight.
8. An ignition coil substantially as herein described with reference to the accompanying drawing.
GB8026212A 1979-09-11 1980-08-12 Ignition coil for ignition systems for combustion engines Expired GB2058473B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792936600 DE2936600A1 (en) 1979-09-11 1979-09-11 IGNITION COIL FOR IGNITION SYSTEMS FOR INTERNAL COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
GB2058473A true GB2058473A (en) 1981-04-08
GB2058473B GB2058473B (en) 1983-04-13

Family

ID=6080513

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8026212A Expired GB2058473B (en) 1979-09-11 1980-08-12 Ignition coil for ignition systems for combustion engines

Country Status (5)

Country Link
JP (1) JPS5646515A (en)
AU (1) AU6049380A (en)
DE (1) DE2936600A1 (en)
ES (1) ES494924A0 (en)
GB (1) GB2058473B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2522190A1 (en) * 1982-02-19 1983-08-26 Transfix Soc Nouv ELECTRIC TRANSFORMER

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3314410A1 (en) * 1983-04-21 1984-10-25 Bosch Gmbh Robert IGNITION COIL FOR THE MULTI-PLUGED AND DISTRIBUTORLESS IGNITION SYSTEM OF AN INTERNAL COMBUSTION ENGINE
CN110739138A (en) * 2019-10-25 2020-01-31 中国科学院电工研究所 phase-change cooling high-frequency high-voltage power electronic transformer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2522190A1 (en) * 1982-02-19 1983-08-26 Transfix Soc Nouv ELECTRIC TRANSFORMER
EP0087363A1 (en) * 1982-02-19 1983-08-31 SOCIETE NOUVELLE TRANSFIX Société Anonyme Electric transformer

Also Published As

Publication number Publication date
DE2936600A1 (en) 1981-03-26
AU6049380A (en) 1981-03-19
ES8106375A1 (en) 1981-08-01
JPS5646515A (en) 1981-04-27
GB2058473B (en) 1983-04-13
ES494924A0 (en) 1981-08-01

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PCNP Patent ceased through non-payment of renewal fee