CN1221961A - Ignition coil with counter magnetic field - Google Patents
Ignition coil with counter magnetic field Download PDFInfo
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- CN1221961A CN1221961A CN 98119297 CN98119297A CN1221961A CN 1221961 A CN1221961 A CN 1221961A CN 98119297 CN98119297 CN 98119297 CN 98119297 A CN98119297 A CN 98119297A CN 1221961 A CN1221961 A CN 1221961A
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- ignition coil
- magnetic core
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Abstract
An ignition coil having a transformer surrounding a cylindrical magnetic core. The transformer has a primary coil, to which a DC potential is applied in bursts and which generates a primary magnetic field, and a secondary coil, which retrieves induced electromotive force. An outer cylinder, surrounding the transformer, is also provided. At at least one end of the ignition coil at least one toroidal magnet is located. The inside and outside perimeters of the toroidal magnets have polarities which are opposite to each other. When a plurality of magnets is provided, they are nested inside one another between the magnetic core and the outer cylinder. The direction of the reverse biasing magnetic field generated by the magnet(s) is opposite to that of primary magnetic field generated by the primary coil. The foregoing construction provides a compact ignition coil which is efficient in operation and is capable of making effective use of the induced electromotive force generated.
Description
The present invention requires the priority of the Japanese 9-253175 of application on September 18th, 1997.
The present invention relates to useful especially ignition coil in internal combustion engine of motor vehicle.More particularly, the present invention relates to a kind of independent ignition-type ignition coil that inserts in the engine spark plug hole.Background of invention
Japan OPI8-213259 has described the common ignition coil that is applied in the internal combustion engine.Shown in Figure 11 and 12, the ignition coil with unlimited magnetic circuit comprises the instrument transformer of being made up of primary coil 3, and primary coil 3 surrounds secondary coil 5, and the latter surrounds magnetic core 1 again.For preventing magnetic leakage, exterior circular column 9 be configured in instrument transformer 7 around.This structure is comparatively compact, and diameter is little.
Plate shape magnetic part 11 is in the one or both ends of magnetic core 1, and for magnetic field B 1 provides contrary magnetic bias, and magnetic field is produced by primary coil 3.The remaining magnetic flux density in magnetic core 1 that is produced by primary coil 3 reduces because of the coercive force of magnetic part 11.When with pulse mode one direct current voltage being put on primary coil 3, the variation of magnetic flux density increases in the magnetic core 1, so produced more effective withdrawal on secondary coil 5.
For replenishing magnetic core 1, be provided with exterior circular column 9.Yet because the magnetic circuit between magnetic core 1 and the exterior circular column 9 interrupts, actual magnetic leakage is bigger.The application that this has damaged magnetic field B 1 makes energy regain efficient and reduces.
Most of magnetic field B 1 of extending to the described ends of exterior circular column 9 from magnetic core 1 described end is along perpendicular to the direction of magnetic core axis.The magnetic field A1 that produces by magnetic part 11 be along this magnetic part thickness direction, promptly form along the axial of magnetic core 1.As a result, magnetic field B 1 is not weakened by magnetic part 11, and on the contrary, the magnetic field B 1 that forms between magnetic core 1 and exterior circular column 9 has been avoided magnetic part 11.Therefore, contrary bias field A1 can not support effectively and get magnetic field B 1.This has stoped the increase of secondary output extraly.The resultant magnetic field C1 that Figure 11 and 12 expressions are formed by magnetic field B 1 and magnetic field A1.So especially see in Figure 12, resultant magnetic field C1 has avoided magnetic field 11, thereby not weakened.
Japan OPI3-154311 discloses the ignition coil of a kind of band shape permanent magnet as contrary magnetic bias magnetic part.Yet this patent is not mentioned the direction in the magnetic field that is produced by magnetic part, therefore, contrary bias field to apply state unclear.If magnetic part produces a magnetic field along its thickness axis,, then can not obtain a suitable contrary bias field owing to reason recited above as the situation of Figure 11 and routine techniques shown in Figure 12.On the other hand, if magnetic part radially produces a magnetic field, then the intensity of permanent magnet can be not enough, because it must be in the toroidal core.For this reason, under this state, can not obtain a contrary bias field with sufficient intensity.
Therefore, an object of the present invention is to provide a kind of like this magnetic field, the magnetic field that it can be produced by primary coil with the effective and efficient manner utilization, and can apply one and become and opposite suitable and enough magnetic field, magnetic field by the primary coil generation by magnetic bias.When realizing this purpose, just can obtain more effective withdrawal energy, allow more compact structure simultaneously, make diameter littler.
In the embodiment of this invention, be provided with an ignition coil with an instrument transformer, this instrument transformer surrounds a cylinder shape magnetic core.This instrument transformer comprises common primary coil, and direct voltage puts on primary coil with pulse mode, thereby primary magnetic field of primary coil generation, also comprises a secondary coil of regaining the electromotive force of induction.One cylindrical column piece surrounds this instrument transformer.
In one embodiment of the invention, be provided with some toroidal magnetic fields, wherein inner periphery and the outer periphery have reciprocal polarity.Continuous toroidal magnet has dwindled size.Therefore their intussusceptions mutually.One end of the contiguous instrument transformer at least of the toroidal magnet of intussusception is along the axis setting of magnetic core.They are between magnetic core and the exterior circular column, thereby it is applied a counter field.This counter field is opposite with the direction of primary magnetic field.
In the preferred form of this embodiment, magnetic core is a si fe alloy.Yet because this alloy is difficult to machine work, it is favourable that this magnetic core is made of some laminated plates, and these laminated plates extend along the axis of magnetic core.For avoiding the machine work problem, before lamination, Jiang Geban strikes out desirable reservation shape.
Wish that simultaneously instrument transformer abuts against the outside of magnetic core.For reaching best effect, magnetic core should extend axially, and exceeds the end away from toroidal magnet of exterior circular column.
In the second embodiment of the present invention, be provided with a protruding flange that surpasses the magnetic core periphery.This flange is near an end setting of magnetic core at least, and a toroidal magnet is arranged between the outer peripheral face and exterior circular column inner peripheral surface of magnetic core.The inner peripheral surface of toroidal magnet has a magnetic field, and polarity is opposite with its outer peripheral face.
In this embodiment, this magnetic core comprises described flange and a core assembly, the latter from described flange to this end extending axially along ignition coil away from the ignition coil of core assembly.Wish that this core assembly and flange made by si fe alloy.As among first embodiment, overcome by such manner about the machine work problem of core assembly, stamp out some plates earlier, then that they are stacked, make each other and be close to, they extend axially along magnetic core.
This flange also is to be made by si fe alloy usually, in the case, stamps out laminated plate, and stacked by the relation of reclining on another top.Their diameter is greater than the diameter of core assembly.
In the modification of second embodiment, this flange comprises an annular magnet part, and its internal diameter cooperates with the magnetic core external diameter.Especially wish that annular magnet part and core assembly make by si fe alloy.Core assembly is by being made by laminated plate with aforementioned same mode.Yet in this modification, this ring magnetic part comprises some annular stacked rings.These stacked rings are stacked together making after punching press.
In this embodiment, in the lamination of forming flange, be provided with at least one radially slit.Best, in this property part, make some such slits.When the first magnetic field that is produced by primary coil changed, what produce around the magnetic core axis in the part that can deperm followed current vortex.As a result, also reduce energy loss, and can fully regain secondary energy.
In another modification of this device, this flange comprises some laminations of being close to each other.These laminations extend axially along magnetic core.
In these accompanying drawings that constitute this specification part, the identical identical parts of label mark, wherein
Fig. 1 is a drawing in side sectional elevation of the ignition coil of first embodiment of the invention;
Fig. 2 is the top view of Fig. 1 ignition coil;
Fig. 3 is the perspective view of institute's accepted standard permanent magnet in the ignition coil of Fig. 1;
Fig. 4 is the cross section of Fig. 3 magnet;
Fig. 5 is the amplification cross section of Fig. 1 ignition coil one end, the magnetic field that expression is produced by magnet and primary coil.
Fig. 6 is the view that is analogous to Fig. 5, represents compound magnetic field;
Fig. 7 is the view that is analogous to the second embodiment of the invention of Fig. 1;
Fig. 8 is the perspective view of magnetic core that is used for the ignition coil of Fig. 7;
Fig. 9 is the view that is analogous to Fig. 8, another embodiment of presentation graphs 8 magnetic cores;
Figure 10 is the perspective view of the decomposition of Fig. 8 magnetic core second alternate embodiment;
Figure 11 is the view that is analogous to Fig. 5, the magnetic field of expression prior art ignition coil;
Figure 12 is the view that is analogous to Fig. 6, is illustrated in the resultant field that forms in the prior art device.Detailed Description Of The Invention
Referring to figs. 1 through 6, ignition coil 21 comprises instrument transformer 49, magnetic core 23, exterior circular column 33 and toroidal magnet 41,43,45 and 47.Instrument transformer 49 is by forming at primary coil 25 on first bobbin 29 and the secondary coil 27 on second bobbin 31.Exterior circular column 33 surrounds instrument transformer 49, and toroidal magnet 41,43,45 and 47 is between the upper end 33a of magnetic core 23 upper end 23a and exterior circular column 33.Direct voltage puts on primary coil 25 with pulse mode, and secondary coil 27 is used to regain induced electromotive force.
As more detailed expression at Fig. 2 to 4, toroidal magnet 41,43,45 and 47 has inner peripheral surface 51 and outer peripheral face 53.The latter has external diameter R2, and the former has internal diameter R1.The difference of R2 and R1 is the radial thickness T of toroidal magnet.Have found that, though radial thickness T be external diameter R2 1/10th or littler, just can avoid the cracking of toroidal magnet during manufacture and peel off, or make it reduce to minimum.Can have two kinds of different magnets 41,43,45 and 47, be oriented in the direction in the magnetic field that produces by primary coil 25.Specifically, the direction in the magnetic field that is formed by toroidal magnet is opposite with the direction in the magnetic field that is produced by primary coil.Like this, the direction in primary coil magnetic field is depended in the selection of the south poles of inner peripheral surface 51 (outer peripheral face 53 is opposite).
The toroidal magnet 41,43,45 and 47 of order is nestable mutually, and its whole assembly is inserted between magnetic core 23 and the exterior circular column 33.The inner peripheral surface 51 of toroidal magnet 47 is close on the outer peripheral face of magnetic core 23, and the outer peripheral face 53 of toroidal magnet 41 is close on the inner peripheral surface of exterior circular column 33.
As illustrated in Figures 5 and 6, the primary magnetic field B2 that is produced by primary coil 25 is applied between magnetic core 23 and the exterior circular column 33.Reverse by toroidal magnet 41,43,45 and 47 contrary bias field A2 and the primary magnetic field B2 that produce, and be used to weaken it, therefore, form resultant field C2.Like this, the setting of some toroidal magnets, the utmost point that each magnet has with in addition magnet is identical to, strengthened contrary bias field A2, thereby it and primary magnetic field B1 are resisted most effectively.
In Fig. 7 to 10, represent the second embodiment of the present invention.Ignition coil 61 is approximately identical to the structure of the ignition coil 21 shown in Fig. 1.Yet magnetic core 63 comprises core assembly 65 and flange 67.Core assembly 65 and flange 67 are made of silicon copper plate 69 and 71 respectively.The former comes lamination by the mode identical with first embodiment of the invention basically.As for flange 67, silicon steel plate 71 is made through punching press, but its diameter is greater than the diameter of core assembly 65.Plate 71 piles up each other by the relation of fitting.Toroidal magnet 41 is inserted between the outer rim 63b of the inwall of exterior circular column 33 and flange 67.
A kind of form of expression magnetic core 63 in Fig. 8.Magnet assembly 65 is made by silicon steel plate 69.Flange with edge 63b is made by some silicon steel plates 71.Slit 73 radially is configured on the flange 67 with circumferencial direction, and more radially outer putting extends to more radially inner points from edge 63b from flange 67 centers.Slit 73 helps to reduce the vortex flow amount, and this vortex flow is to produce around the axis of magnetic core 63 when the magnetic field B that is produced by primary coil 25 changes.
Another modification of expression magnetic core 63 in Fig. 9.Flange 75 is by 76 groups on the stacked si fe alloy ring of annular.After building up, they are installed to the periphery of core assembly 65 closely, are provided with slit 77 thereby finish magnetic core 63, the purposes of the slit in its purposes and the modification shown in Figure 8 is identical.
Another modification of expression magnetic core 63 in Figure 10.Here, flange 63b and core assembly 65 are made up of some si fe alloy plates 79, extend along the direction that is parallel to core assembly 65 axis.This structure decrease of the present invention the generation of vortex flow, thereby need not slit 73,77.
Though clearly narration only is some embodiment of the present invention and modification, yet these variations are conspicuous for common skilled professional, and they can make these variations and not depart from the scope of the present invention and spirit. Toroidal magnet 41,43,45 and 47 can be configured in the end opposite of ignition coil 21 or 61, can be set at two ends in addition.These magnets are not limited to annular, and they can be rectangle or other shape, depend on the character in space between exterior circular column 33 and magnetic core 23 or 63.
Though secondary coil 27 is expressed and is stated as in the inside of primary coil 25, yet they can have different arrangements.Primary coil 25 and secondary coil 27 are also located within the scope of the invention along the configuration arranged side by side of the axis of magnetic core 23 or 63.These magnetic parts will be configured near the non-conterminous end of this two lines circle.
The present invention has many advantages.Because the magnetic field that is produced by primary coil is between magnetic core and the exterior circular column as magnet, the contrary bias field that is produced by magnet is positively opposite with primary magnetic field, and this can make the latter more effective.
Should contrary bias field between magnetic core and exterior circular column, form, along the radially extension of these magnets near instrument transformer one end.This radial magnetic field works consumingly, the resistance primary magnetic field, thus reduced the magnetic flux density in the magnetic core.This has also weakened the remanent magnetization that is produced by primary magnetic field in the magnetic core.Therefore, make ignition coil compact more, its diameter can dwindle, and significantly improves energy and regains efficient.
Assembling according to this in another of some toroidal magnets.This assembly is inserted between magnetic core and the exterior circular column.Do not forming the gap between the magnet or between magnet and magnetic core or exterior circular column.As a result, the radial thickness of each magnet 1/10th or do not peel off in manufacture process or damaged the appearance less than external diameter.Therefore, the product percent of pass of magnet has improved, and the price of ignition coil obviously descends.
The application of layering and/or lamination silicon steel provides a solution of this alloy problem of machine work.Therefore, replace machine work, make these elements, press them together, constitute core assembly and flange with drawing quality steel sheet.Like this, obtain the first-class magnet character of si fe alloy and avoided the machine work problem.
The inner and outer circumferential surfaces of toroidal magnet has opposite polarity.In an assembly, the configuration of polarity is identical to its all parts, and this assembly is near an end of instrument transformer between flange and the outer core.The result obtains the magnetic continuity between magnetic core and the exterior circular column, and primary magnetic field passes magnet at magnetic core and exterior circular column.Like this, make primary magnetic field and contrary bias field obtain effective utilization.
With regard to contrary bias field, it is radially produced by the magnet near instrument transformer one end, and extends between magnetic core and exterior circular column.This just allows to apply reliably contrary bias field and remove to revolt the primary magnetic field that also produces between magnetic core and exterior circular column, therefore reduced the magnetic flux density in the magnetic core and the magnetic core that produces by primary magnetic field in remanent magnetization.This makes the size that allows to dwindle ignition coil, and thisly dwindles and improve energy and regain efficient and be associated.
In the present invention, a configurable flange on magnetic core.In this structure, the inner and outer diameter of magnet can be greatly more than the arrangement of seeing in Japanese OPI3-154311, and in the scheme of Japan, magnet is configured in the toroidal core.Therefore, the lip diameter of each magnet can be increased, and can make contrary bias field keep enough intensity by this.The slit that radially extends is set in flange, has reduced the vortex flow that produces in flange around its axis, otherwise, these vortex flows can produce owing to the variation of primary magnetic field.Like this, reduce energy loss, and can from secondary coil, regain the energy that is produced effectively.
Though knowing disclosed only is some embodiment of the present invention, yet except the feature by the claims by the appended claims herein limited, the present invention will be not limited thereto by explanation at wide significance.
Claims (19)
1. an ignition coil comprises an instrument transformer that surrounds a cylinder shape magnetic core, and described instrument transformer comprises a primary coil, and direct voltage puts on primary coil with pulse mode, and therefore just coil produces a primary magnetic field; A secondary coil, it regains the electromotive force that weakens; An exterior circular column that surrounds described instrument transformer;
Some toroidal magnets, each has inside and outside side face, its polarity is opposite each other, one of described toroidal magnet intussusception according to this in another, along at least one end configuration of the contiguous instrument transformer of the axis of described magnetic core, described toroidal magnet is between described magnetic core and the exterior circular column, therefore, described toroidal magnet applies a counter field to described magnetic core and exterior circular column, and described counter field is opposite with described primary magnetic field direction.
2. by the described ignition coil of claim 1, it is characterized in that described magnetic core comprises some laminated plates.
3. by the described ignition coil of claim 2, it is characterized in that described laminated plate extends along the axis of described magnetic core.
4. by the described ignition coil of claim 2, it is characterized in that described laminated plate is a silicon steel, and be stamped into predetermined shape.
5. by the described ignition coil of claim 1, it is characterized in that described instrument transformer is close to described magnetic core.
6. by the described ignition coil of claim 1, it is characterized in that described core axis and extend beyond an end of described exterior circular column that described toroidal magnet vicinity is away from an end of their described ignition coil.
7. ignition coil, comprise an instrument transformer that surrounds a cylinder shape magnetic core, described magnetic core comprises a flange and a core assembly, and described instrument transformer comprises a primary coil, direct voltage puts on primary coil with pulse mode, so it produces a primary magnetic field; A secondary coil, it regains the electromotive force that weakens; An exterior circular column that surrounds described instrument transformer;
Described flange extroversion is stretched the outer surface that surpasses described core assembly, along contiguous its at least one end of described core assembly axis, one toroidal magnet has an inner peripheral surface and an outer peripheral face, its polarity is opposite each other, described toroidal magnet is between the inner peripheral surface of the edge of described flange and described exterior circular column, therefore, described toroidal magnet applies a counter field to described magnetic core and described exterior circular column, and described contrary field is opposite with described primary magnetic field direction.
8. by the described ignition coil of claim 7, it is characterized in that described core assembly is from described flange axially extending to the end away from the described ignition coil of described flange along described ignition coil.
9. by the described ignition coil of claim 8, it is characterized in that described core assembly comprises some be close to each other and along the axially extended laminated plate of described magnetic core.
10. by the described ignition coil of claim 9, it is characterized in that described flange comprises some laminated plates of being close to each other and extending outwardly beyond described outer surface.
11. by the described ignition coil of claim 10, it is characterized in that described laminated plate is a silicon steel plate, it is stamped into the shape of its diameter greater than described core assembly diameter.
Described laminated plate is the silicon steel plate that is stamped into reservation shape.
12. by the described ignition coil of claim 8, it is characterized in that described flange comprises an annular magnet part, its internal diameter cooperates with the external diameter of described core assembly.
13., it is characterized in that described annular magnet part comprises the ring of some annular intussusceptions of being close to each other by the described ignition coil of claim 12.
14., it is characterized in that described annular intussusception ring is the silicon steel ring, and be stamped into the shape of its external diameter greater than the core assembly external diameter by the described ignition coil of claim 13;
Described core assembly comprises right dried laminated plate, and along the axis extension of described magnetic core, described laminated plate is a silicon steel plate, is stamped into predetermined shape.
15. by the described ignition coil of claim 14, it is characterized in that described annular intussusception ring comprises at least one slit radially.
16. by the described ignition coil of claim 15, it is characterized in that on described annular intussusception ring, some slits being arranged, extend along its radius.
17. by the described ignition coil of claim 11, it is characterized in that described laminated plate comprises at least one slit radially.
18., it is characterized in that some radially slits are arranged on described laminated plate by the described ignition coil of claim 17.
19. by the described ignition coil of claim 9, it is characterized in that described flange comprises some layer laminate of being close to each other, described layer laminate is extended along the axis of described magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98119297 CN1221961A (en) | 1997-09-18 | 1998-09-18 | Ignition coil with counter magnetic field |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP253175/97 | 1997-09-18 | ||
| CN 98119297 CN1221961A (en) | 1997-09-18 | 1998-09-18 | Ignition coil with counter magnetic field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1221961A true CN1221961A (en) | 1999-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98119297 Pending CN1221961A (en) | 1997-09-18 | 1998-09-18 | Ignition coil with counter magnetic field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1221961A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100527298C (en) * | 2003-12-24 | 2009-08-12 | 株式会社电装 | Ignition coil having secondary coil assembly and connecting method for the same |
| CN106686995A (en) * | 2014-07-24 | 2017-05-17 | 奥驰亚客户服务有限责任公司 | Electronic vaping device and components thereof |
| CN113823497A (en) * | 2021-05-19 | 2021-12-21 | 中国电力科学研究院有限公司 | Open magnetic circuit voltage transformer device of anti direct current magnetic biasing |
-
1998
- 1998-09-18 CN CN 98119297 patent/CN1221961A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100527298C (en) * | 2003-12-24 | 2009-08-12 | 株式会社电装 | Ignition coil having secondary coil assembly and connecting method for the same |
| CN106686995A (en) * | 2014-07-24 | 2017-05-17 | 奥驰亚客户服务有限责任公司 | Electronic vaping device and components thereof |
| US10660363B2 (en) | 2014-07-24 | 2020-05-26 | Altria Client Services Llc | Electronic vaping device and components thereof |
| US11612184B2 (en) | 2014-07-24 | 2023-03-28 | Altria Client Services Llc | Electronic vaping device and components thereof |
| CN113823497A (en) * | 2021-05-19 | 2021-12-21 | 中国电力科学研究院有限公司 | Open magnetic circuit voltage transformer device of anti direct current magnetic biasing |
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