CN100346429C - Ignition coil for internal combustion engine - Google Patents
Ignition coil for internal combustion engine Download PDFInfo
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- CN100346429C CN100346429C CNB2005100687753A CN200510068775A CN100346429C CN 100346429 C CN100346429 C CN 100346429C CN B2005100687753 A CNB2005100687753 A CN B2005100687753A CN 200510068775 A CN200510068775 A CN 200510068775A CN 100346429 C CN100346429 C CN 100346429C
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Abstract
PROBLEM TO BE SOLVED: To solve the problem wherein cracks might be extended along an adhesion boundary between the fitting part of a head case and an insulating resin due to a heat cycle in a stick-type ignition coil.
Description
Technical field
The present invention relates to a kind of ignition coil for internal combustion engine, it can be limited in the insulating resin of filling and crack.
Background technology
In recent years, for motor vehicle internal combustion engine is presenting variation aspect the specification in length, installation position and connector orientation.Some shaft-like ignition coils have the housing that is used to hold coil and igniter of two formation separated from one another, so that self be applicable to various engine specifications.
US-6781500-B2 and US-2004/0104796-A1 (TOHKEMY 2003-303724 communique) disclose a kind of ignition coil as shown in Figure 9, and it has one first housing 150 and one second housing 155.Holding a center magnetic core 151, a primary coil 152 and a secondary coil 153 etc. in described first housing.Holding an igniter 156 and a terminal 157 etc. in second housing 155.Second housing 155 has a 155a of cylindrical shape department of assembly, and it is assemblied on the outer peripheral face of cylindrical shape upper end 150a of first housing 150.Insulating resin 161 and 162 is filled in the gap and the cavity around the igniter in second housing 155 156 between center magnetic core 151, primary coil 152 and the secondary coil 153 in first housing 150.
For first housing 150 and second housing 155 are assembled into ignition coil, the inner peripheral surface press fit of the 155a of department of assembly of second housing 155 on the outer peripheral face of the cylindrical shape upper end of first housing 150 150a, and is electrically connected primary coil 152 and secondary coil 153 with igniter 156 etc.Then, liquid-state epoxy resin is filled in second housing 155, with the cavity around gap between center magnetic core 151, primary coil 152 and the secondary coil 153 in filling first housing 150 and the igniter in second housing 155 156.Make the liquid-state epoxy resin sclerosis that is filled in described gap and the described cavity by heating.
Yet above-mentioned traditional ignition coil does not have abundant way to prevent to produce come off (crackle) in insulating resin 161.Because the operation of engine, insulating resin 161 can upwards bear thermal stress in the footpath of ignition coil.Described thermal stress can produce minim gap between insulating resin 161 and the cylindrical shape upper end 150a or between insulating resin 161 and the 155a of department of assembly.Subsequently, the minim gap of the upper end of the fitting surface of cylindrical shape upper end 150a and the 155a of department of assembly just can develop into come off (crackle) at the combination interface place of 155a of department of assembly and insulating resin 161.
If crack growth must approach igniter 156 and/or terminal 157 in second housing 155, crackle just may extend in the described insulating resin and the moulding resin of point of arrival firearm 156 and/or terminal 157.Like this, crackle just can damage the function of igniter 156 and/or the terminal 157 that fractures.
Summary of the invention
In view of above-mentioned these problems, the purpose of this invention is to provide a kind of ignition coil for internal combustion engine, it can limit the upper end of fitting surface of department of assembly of the cylindrical shape upper end that starts from first housing and second housing and the crackle that extends along the combination interface of the outer peripheral face of the inner peripheral surface of described department of assembly and described insulating resin to expansions such as igniters.
To achieve these goals, the invention provides a kind of ignition coil for internal combustion engine, comprising: cylindrical shape first housing, wherein holding center magnetic core, be placed in the primary coil in the center magnetic core outside and be placed in the secondary coil in the center magnetic core outside; Second housing, it has installation portion and cylindrical shape department of assembly, and described cylindrical shape department of assembly is assemblied on the periphery of upper end of first housing; Retainer, it is arranged on the upper end of primary and secondary coil, to limit their relative position; The annular insulating resin, it is filled at least by in the department of assembly of the upper end of the topmost of primary and secondary coil, first housing, second housing and the toroidal cavity that retainer limits, and closely contacts with the department of assembly; And crack growth limiter, it is formed by the part of the department of assembly of the second overlapping each other housing and the part of retainer, with the combination interface that combines with insulating resin along the described department of assembly of the axial overlap of first housing and the fitting surface and the described department of assembly of the assembling of described upper end.
In above-mentioned ignition coil, crack growth limiter comprises: first fitting portion, its from interior week of department of assembly radially to projecting inward; And second fitting portion, its outer periphery from retainer stretches out, with overlapping and chimeric with first fitting portion.
In above-mentioned ignition coil, crack growth limiter comprises: first projection, its from interior week of department of assembly radially to projecting inward; And second projection, its outer periphery from retainer stretches out, with overlapping with first projection.
In above-mentioned ignition coil, also comprise: the binding agent accumulation chamber, it is positioned on the periphery of upper end assembles binding agent, so that the department of assembly is bonded on the upper end.
The present invention also provides a kind of ignition coil for internal combustion engine, comprising: cylindrical shape first housing, wherein holding center magnetic core, be placed in the primary coil in the center magnetic core outside and be placed in the secondary coil in the center magnetic core outside; Second housing, it has installation portion and cylindrical shape department of assembly, and described cylindrical shape department of assembly is assemblied on the periphery of upper end of first housing; Retainer, it is arranged on the upper end of primary and secondary coil, to limit their relative position; The annular insulating resin, it is filled at least in the toroidal cavity that the department of assembly by the upper end of the topmost of primary and secondary coil, first housing and second housing limits, and closely contacts with the department of assembly; And crack growth limiter, it is formed by in the part of the part of second housing and retainer any one, wherein in the described part of the described part of second housing and retainer described any one along the fitting surface of described department of assembly of the axial overlap of described first housing and the assembling of described upper end and combination interface that described department of assembly combines with described insulating resin.
In above-mentioned ignition coil, crack growth limiter is following any: first projection, its from interior week of department of assembly radially to projecting inward; And second projection, its outer periphery from retainer is outwards protruded.
In above-mentioned ignition coil, also comprise: the binding agent accumulation chamber, it is positioned on the periphery of upper end assembles binding agent, so that the department of assembly is bonded on the upper end.
The present invention also provides a kind of ignition coil for internal combustion engine, comprising: cylindrical shape first housing, wherein holding center magnetic core, be placed in the primary coil in the center magnetic core outside and be placed in the secondary coil in the center magnetic core outside; Second housing is wherein holding igniter, and has the cylindrical shape department of assembly, and described cylindrical shape department of assembly is assemblied on the periphery of upper end of first housing; The annular insulating resin, it is filled at least in the toroidal cavity that the department of assembly by the upper end of the topmost of primary and secondary coil, first housing and second housing limits, and closely contacts with the department of assembly; And crack growth limiter, it is placed between the fitting surface of igniter in second housing and department of assembly and upper end assembling, with the combination interface that combines with described insulating resin along the described fitting surface of the axial overlap of described first housing and described department of assembly.
In above-mentioned ignition coil, crack growth limiter comprises belt, and described belt and is embedded in the insulating resin in second housing at least or is bonded on the lower surface of igniter in the form of sheets.
In above-mentioned ignition coil, also comprise: the binding agent accumulation chamber, it is positioned on the periphery of upper end assembles binding agent, so that the department of assembly is bonded on the upper end.
Description of drawings
By referring to the following detailed description of doing, claims and the whole accompanying drawing that constitutes the part of the application's book, be appreciated that the function of other purposes of the present invention, feature and advantage and method of operation and associated components.Accompanying drawing comprises:
Fig. 1 is the cutaway view according to the ignition coil for internal combustion engine of the first embodiment of the present invention;
Fig. 2 is the amplification view of the major part among Fig. 1;
Fig. 3 is another amplification view of the major part of Fig. 2;
Fig. 4 is the cutaway view according to the ignition coil for internal combustion engine of the remodeling example of first embodiment;
Fig. 5 is the cutaway view of ignition coil for internal combustion engine according to a second embodiment of the present invention;
Fig. 6 is the cutaway view according to the ignition coil for internal combustion engine of the remodeling example of second embodiment;
Fig. 7 is the cutaway view of the ignition coil for internal combustion engine of a third embodiment in accordance with the invention;
Fig. 8 A is the cutaway view according to the ignition coil for internal combustion engine of the remodeling example of first to the 3rd embodiment;
Fig. 8 B is the cutaway view according to the ignition coil for internal combustion engine of another remodeling example of first to the 3rd embodiment; And
Fig. 9 is the cutaway view of traditional ignition coil for internal combustion engine.
Embodiment
Ignition coil for internal combustion engine according to the present invention has one first housing, second housing and an insulating resin that separates formation with described first housing.Described first housing limits a coil portion, and is wherein holding a primary coil and a secondary coil.Described second housing limits a control part, and is wherein holding an igniter and a terminal.Described insulating resin be filled in the department of assembly of described second housing and the upper end of described first housing (cylindrical shape upper end) fitting surface around, particularly be filled in the top of described cylindrical shape upper end and the inside of described department of assembly.
＜coil portion 〉
Described first housing in the described coil portion is the elongated cylinder shape.Described first housing is being settled a center magnetic core at the central part place in its hole, is settling described primary coil and described secondary coil at the outer circumferential side of described center magnetic core.Described primary coil can be placed in the outside of the inboard or described secondary coil of described secondary coil.Described first housing is keeping a periphery magnetic core on side face or its outer peripheral face within it.
Described insulating resin is filled in the cavity that comprises following gap: the gap between the department of assembly of the gap between the gap between interior winding and the outer bobbin, outer winding and described first housing and the upper end of described primary coil and secondary coil and retainer or described second housing etc.The coefficient of linear expansion that the epoxy resin of the described insulating resin of expectation formation has is littler than the coefficient of linear expansion of the polybutylene terephthalate (PBT) (PBT) that forms described second housing and described retainer.
＜control part 〉
Described control part comprises described second housing and described igniter etc.Described second housing has an installation portion and described department of assembly.In many examples, described igniter is installed all in the described installation portion, and described insulating resin is filled in described igniter second cavity on every side.The inner peripheral surface press fit of described department of assembly is on the outer peripheral face of the described cylindrical shape upper end of described first housing.In the assembling of described control part, described primary coil, described secondary coil and described center magnetic core are arranged in described first housing, and the described department of assembly press fit of described second housing is on the outer peripheral face of the described cylindrical shape upper end of described first housing.As a kind of alternative method, described igniter also can be placed in the outside of described installation portion.In this case, the described terminal that described primary and secondary coil and described igniter are coupled together is placed in the described installation portion.
＜retainer 〉
The same with described second housing, described retainer is also made by PBT.Described retainer is in the form of annular discs generally, and described ignition coil vertically on be placed between the upper end and described igniter of described center magnetic core etc.Described retainer is arranged on the top of the upper end of described center magnetic core, described primary coil and described secondary coil, to stop up the upper end open of described first housing.Therefore, described retainer can make described center magnetic core, described primary coil, described secondary coil and described igniter radially and vertically all aligning each other at described ignition coil.At this, described retainer and described first and second housings are described separately.Yet according to the present invention, described retainer can be thought the part of described coil portion or described control part.
＜crack growth limiter 〉
Ignition coil according to the present invention also has a crack growth limiter, and it is used for limiting crackle and produces and expansion at the insulating resin of filling.Described crack growth limiter is optimized to specially is used to limit following crackle, promptly starts from the upper end of fitting surface of described cylindrical shape upper end of the described department of assembly of described second housing and described first housing and the crackle that extends to described igniter and/or described terminal along the combination interface of the inner peripheral surface of described department of assembly and described insulating resin.Described crack growth limiter can be divided into following three types.
(a) first type
First type crack growth limiter comprises described retainer.Described retainer is arranged on the described upper end open of described first housing, in described first housing described center magnetic core etc. has been installed.As a kind of alternative method, described retainer also can be connected on the lower surface of described second housing, and then together is arranged on the described upper end open of described first housing with described second housing.
The part of the described department of assembly of described second housing and the part of described retainer form the described crack growth limiter of top of the upper end of the fitting surface that is arranged on described department of assembly and described cylindrical shape upper end.Specifically, one first fitting portion from the part in the interior week of described second housing radially to projecting inward.One second fitting portion radially outward protrudes from the part of the periphery of described retainer.Then, described first and second fitting portions are overlapping and chimeric each other.Needn't be always that described first and second fitting portions are chimeric each other.Described first and second fitting portions can only overlap to form described crack growth limiter.Described second housing needn't always comprise described igniter.
Described crack growth limiter is overlapping with described fitting surface or described cylindrical shape upper end diametrically, and is placed in the top of the upper end of described fitting surface or described cylindrical shape upper end in the vertical, with the expansion of restriction crackle.
(b) second type
Second type crack growth limiter also comprises described retainer.A described crack growth limiter that forms the tops such as described cylindrical shape upper end that are arranged on described second housing from projection or another projection that protrudes from the part of the periphery of described retainer of the part protrusion of the described department of assembly of described second housing.Described crack growth limiter comprises any projection in described another projection of the described projection of described department of assembly and described retainer.Described crack growth limiter is overlapping with described fitting surface or described cylindrical shape upper end diametrically, and is placed in the top of the upper end of described fitting surface or described cylindrical shape upper end in the vertical.Described second housing can comprise or not comprise described igniter.
(c) the third type
The crack growth limiter of the third type has the described retainer that is holding described igniter.Described crack growth limiter is placed in the inside of described second housing and the below of described igniter.Specifically, described crack growth limiter is embedded in the described insulating resin or is bonded on the lower surface of described igniter and the upper surface of described retainer etc.Described crack growth limiter is overlapping with described fitting surface or described cylindrical shape upper end diametrically, and is placed in the top of the upper end of described fitting surface or described cylindrical shape upper end in the vertical.Described second housing can comprise or not comprise described retainer.
＜binding agent accumulation chamber 〉
Above-mentioned first kind to the crack growth limiter of the third type, being provided with one on the outer peripheral face of the described cylindrical shape upper end of described first housing, can to assemble the binding agent accumulation chamber that is used for described department of assembly is bonded in the binding agent on described first housing very useful.Described binding agent accumulation chamber can be realized along the circumferencial direction of described cylindrical shape upper end or the groove of longitudinal extension by one or more.
＜the first embodiment 〉
(structure)
As shown in Figure 1, the ignition coil according to first embodiment has: be placed in the coil portion 10 of vertical pars intermedia of ignition coil, the control part 30 on top that is placed in ignition coil and the high-pressure tower portion (not shown) that is placed in the bottom of ignition coil.Coil portion 10 comprises the periphery magnetic core 25 on the outer peripheral face that is contained in center magnetic core 15, secondary coil 17 and the primary coil 21 in a cylindrical shape first housing 12 and is fixed on first housing 12.Secondary coil 17 is placed in the outer circumferential side of center magnetic core 15, and has the secondary bobbin 18 of cylindrical shape of an insulating properties and the secondary winding 19 on outer peripheral face that is wound on secondary bobbin 18.Primary coil 21 is placed in the outer circumferential side of secondary coil 17, and is configured to the pattern identical with secondary coil 17, also has an elementary bobbin 22 and an elementary winding 23.The outer peripheral face of first housing 12 is provided with a recess, with assembling periphery magnetic core 25, thereby, periphery magnetic core 25 can be in the footpath of ignition coil centering heart magnetic core 15 upward.
As illustrated in fig. 1 and 2, control part 30 comprises second housing 32 and the igniter 34 that is installed in second housing 32.Described second housing comprises installation portion 33, department of assembly 36 and a connector portion 38.Installation portion 33 is roughly box-shaped, so that igniter 34 is installed in wherein.Connector portion 38 is placed in the radial outside of installation portion 33, and is keeping terminal 39.Department of assembly 36 is placed in the downside of installation portion 33, and is assemblied on the cylindrical shape upper end 13 of first housing 12 upper end that periphery magnetic core 25 with cover cap.Second housing 32 has first fitting portion 62 on the inner peripheral surface of stage portion 61, wherein, described stage portion 61 is placed between installation portion 33 and the department of assembly 36.
Below, will describe the assembly structure of retainer 41 and coil portion 10 in detail.Shown in Fig. 2 and 3, first fitting portion 62 of second housing 32 has roughly L shaped cross section, and extends along the part of the inner peripheral surface of stage portion 61.First fitting portion 62 comprise one from the inner peripheral surface of stage portion 61 radially to projecting inward first 63 and a second portion 64 that vertically protrudes from the lower surface of first 63.First and second parts 63 and 64 form a groove.Second fitting portion 65 of retainer 41 has roughly L shaped cross section, and extends along the part of the outer peripheral face of retainer 41.Second fitting portion 65 comprises an outside first 66 of protruding of the outer periphery from retainer 41 and a second portion 67 that protrudes from the upper surface of first 66.First and second parts 66 and 67 form a groove.
At this moment, first fitting portion 62 of stage portion 61 can be chimeric with the groove of retainer 41, and second fitting portion 65 of retainer 41 can be chimeric with the groove of stage portion 61.Therefore, can above the cylindrical shape upper end 13 of the fitting surface 76 and first housing 12, form crack growth limiter 60.
Form a gap between secondary winding 19 and the elementary bobbin 22.Form another gap between the elementary winding 23 and first housing 12.All be formed with the gap between center magnetic core 15 and the secondary bobbin 18 or between center magnetic core 15 and the retainer 14.These gaps communicate with each other, to form bubble-tight annular first cavity 71.The epoxy resin that is filled in annular first cavity 71 forms annular first insulating resin 72 by heat hardening.
＜assembling 〉
Described ignition coil is assembled as follows.Center magnetic core 15, secondary coil 17 and primary coil 21 are installed in first housing 12, and then, retainer 41 is arranged on first housing 12.Igniter 34 is installed in the installation portion 33 of second housing 32.Department of assembly's 36 press fit of second housing 32 are on the cylindrical shape upper end 13 of first housing 12, so that department of assembly 36 forms tight the contact with cylindrical shape upper end 13 at fitting surface 76 places.Then, first fitting portion 62 that is located on the stage portion 61 of second housing 32 is chimeric with second fitting portion 65 of retainer 41.
Subsequently, first cavity 71 is kept under the situation of negative pressure, liquid-state epoxy resin is being filled in second cavity 73 in the installation portion 33.Epoxy resin can attracted in the resin fill hole 56, and can be in first cavity 71 from top to the bottom with from the perimembranous filling to the right of left side perimembranous.Therefore, epoxy resin can be filled in the gap and the gap between center magnetic core 15 and the retainer 41 between gap, center magnetic core 15 and the secondary bobbin 18 between gap, elementary winding 23 and first housing 12 between secondary winding 19 and the elementary bobbin 22.When epoxy resin was filled in first cavity 71, the air in first cavity 71 can flow to second cavity 73 by steam vent 58.The epoxy cure that is filled in first cavity 71 is formed first insulating resin 72.The epoxy cure that is filled in second cavity 73 is formed second insulating resin 74.
Below, with describing in detail epoxy resin is filled in stowing operation in first cavity 71.When liquid-state epoxy resin when retainer 41 and second housing 32 keep the state retrofilling that is connected in first cavity 71, have stowing pressure and upwards promote retainer 41.At this, all can there be scale error in first fitting portion 62 of second housing 32 and second fitting portion 65 of retainer 41.Therefore, as shown in Figure 3, be subjected to retainer 41 that liquid insulating resin upwards promotes between the lower surface of the cylindrical shape upper end 13 of first housing 12 and the second portion 67 of retainer 41, to produce gap 71a, generation gap 71b etc. between the outer peripheral face of the inner peripheral surface of department of assembly 36 and second portion 67.The epoxy cure that is filled among gap 71a, the 71b is formed insulating resin 72a, 72b.
The size of first fitting portion 62 of second housing 32 and second fitting portion 65 of retainer 41 and the filling situation of tolerance and insulating resin can cause producing gap 71a, 71b maybe can cause producing arbitrary gap among 71a, the 71b.Like this, insulating resin just can be filled in arbitrary gap that maybe can be filled among two gap 71a and the 71b among gap 71, the 71b.Combination interface 77 is formed on the contact site of the inner peripheral surface of department of assembly 36 and insulating resin 72a, 72b.Yet first and second fitting portions 62,65 that form described crack growth limiter can limit upper end 13a that starts from cylindrical shape upper end 13 and the crackle expansion of extending along combination interface 77.Below, will describe the action effect of above-mentioned crack growth limiter in detail.
＜action effect 〉
Described ignition coil according to present embodiment has the following advantages.At first, shown in Fig. 2 and 3, can prevent from the combination interface 77 of the outer peripheral face of the inner peripheral surface of the department of assembly 36 of second housing 32 and insulating resin 72, to produce gap and/or crackle.The coefficient of linear expansion of epoxy resin of insulating resin 72 that formation is placed in radially inner side is littler than the coefficient of linear expansion of the PBT that forms second housing 32 be positioned at radial outside.Therefore, when insulating resin 72 bore thermal stress, insulating resin 72 distortion diametrically will be less relatively, and department of assembly 36 distortion diametrically then can be relatively large.Therefore, the combination interface 77 between them will hardly can be separated from one another, thereby can prevent to produce the gap.
Secondly, even produced crackle, crack growth limiter 60 also can limit crackle and extend upward from stage portion 61 and retainer 41.In other words, first fitting portion 62 that extends radially inwardly from stage portion 61 and be arranged on the top of the upper end 13a of cylindrical shape upper end 13 from outward extending second fitting portion 65 of the outer periphery of retainer 41 is to increase rigidity herein.Therefore, described crack growth limiter can limit upwards expansion of crackle.Therefore, crackle can not extend up to second insulating resin 74 in the installation portion 33 that is filled in second housing 32.
The remodeling example of＜the first embodiment, other embodiment 〉
Below, will a remodeling example and other embodiment of first embodiment be described.Each embodiment among these embodiment all has a crack growth limiter of constructing differently with first embodiment, but except described crack growth limiter, they have the structure roughly the same with first embodiment again.Therefore, below description will concentrate on the described crack growth limiter.The description of other structures sees also first embodiment.
The remodeling example of (1) first embodiment
Fig. 4 shows the remodeling example of first embodiment.The described remodeling example of first embodiment has the assembly of formation of the projection 86 of the projection 82 of stage portion 81 of second housing 32 and retainer 41, and it is different from first embodiment.In first embodiment, first fitting portion 62 of stage portion 61 is chimeric each other with second fitting portion 65 of retainer 41.Yet in the described remodeling example of first embodiment, the projection 82 that protrudes from stage portion 81 is placed in the top position, and the projection 86 that protrudes from retainer 41 is placed in lower position.Projection 82 and 86 overlaps each other.The described remodeling example of first embodiment has the another one advantage, and the projection 82,86 that promptly has simple shape can form and assemble more simply.
(2) second embodiment
As shown in Figure 5, have one L shaped 92 according to the ignition coil of second embodiment, it is along the inner peripheral surface definite length extended of the stage portion 91 of second housing 32.Comprise a first that extends radially inwardly 93 and a second portion 94 that vertically extends for L shaped 92 downwards.The cylindrical shape upper end 13 that the groove (not shown) that is formed by first and second parts 93,94 is keeping first housing 12.Be placed in the top of fitting surface 76 and combination interface 77 for L shaped 92.Second embodiment also has the another one advantage, can simplify the shape and the structure of crack growth limiter 60 under the situation of the shape that does not need to transform retainer 41.
The remodeling example of (3) second embodiment
As shown in Figure 6, have a projection 96 according to the ignition coil of one of second embodiment remodeling example, its part from the outer peripheral face of retainer 41 is radially outward protruded, with definite length extended in a circumferential direction.Projection 96 is placed in the top of fitting surface 76 and combination interface 77.Corresponding to projection 96, stage portion 97 side face within it is provided with a grooving 98, with the lower surface of supporting projection 96.The described remodeling example of second embodiment also has the another one advantage, promptly by making stage portion 97 only be provided with shape and structure that grooving 98 can be simplified described crack growth limiter.
(4) the 3rd embodiment
As shown in Figure 7, have a strap 105, be embedded in the insulating resin 73 between its igniter 34 in being installed on second housing 33 and the retainer 41 according to the ignition coil of the 3rd embodiment.Belt 105 can be located at before the packing ring epoxy resins in second housing 32, and was placed in the top of fitting surface 76 and combination interface 77.With structural similarity shown in Figure 6, the grooving 98 of stage portion 101 is supporting the projection 96 of retainer 41.The 3rd embodiment also has the another one advantage, and promptly the projection 96 of belt 105 and retainer 41 can limit the crackle expansion more reliably.
(the remodeling example of first to the 3rd embodiment)
Fig. 8 A and 8B show the common remodeling example of first to the 3rd embodiment.In the described remodeling example of first to the 3rd embodiment, the binding agent 112 and 117 that accumulates in binding agent accumulation chamber 110 and 115 is supplied to described fitting surface, to guarantee the assembly quality between described first and second housings.Shown in Fig. 8 A, the cylindrical shape upper end 13 of the department of assembly of assembling second housing 32 36 on first housing 12 is provided with a plurality of grooves 110, and they are assembled binding agent 112 hereinto.When department of assembly 36 was assemblied on the cylindrical shape upper end 13, binding agent 112 can flow to the outer peripheral face of cylindrical shape upper end 13 and the inner peripheral surface of department of assembly 36 is a fitting surface 76 from groove 110.Thereby, can guarantee the assembly quality between department of assembly 36 and the cylindrical shape upper end 13.Shown in Fig. 8 B, the binding agent accumulation chamber of assembling binding agent 117 can realize along the circumferencial direction of cylindrical shape upper end 13 or the groove 115 of longitudinal extension predetermined length by one or more.
Described binding agent can be replaced by the epoxy resin that is filled in first and second cavitys 71,73.In other words, under the situation shown in Fig. 8 A, also it is filled in the groove 110 in the time of can be in epoxy resin being filled in first cavity, 71 grades.Under the situation shown in Fig. 8 B, by forming a path that is communicated with groove 115, also it is filled in the groove 115 by described path in the time of can be in epoxy resin being filled in first cavity, 71 grades.
In fact only with explaining, therefore, the change that does not break away from marrow of the present invention still within the scope of the present invention to description that the present invention did.This change should not thought and broken away from the spirit and scope of the present invention.
Claims (10)
1. ignition coil for internal combustion engine comprises:
Cylindrical shape first housing (12) is wherein holding center magnetic core (15), is being placed in the primary coil (21) in center magnetic core (15) outside and is being placed in secondary coil (17) outside the center magnetic core (15);
Second housing (32), it has installation portion (33) and cylindrical shape department of assembly (36), and described cylindrical shape department of assembly (36) is assemblied on the periphery of upper end (13) of first housing (12);
Retainer (41), it is arranged on the upper end of primary and secondary coil (21,17), to limit their relative position;
Annular insulating resin (72), it is filled at least by primary and secondary coil (21, in the toroidal cavity (71) that the upper end (13) of topmost 17), first housing (12), the department of assembly (36) of second housing (32) and retainer (41) limit, and closely contact with department of assembly (36); And
Crack growth limiter (60), it is formed by the part (62) of the department of assembly (36) of overlapping each other second housing (32) and the part (65) of retainer (41), with the combination interface (77) that combines with insulating resin (72) along the described department of assembly of axial overlap (36) of described first housing (12) and fitting surface (76) and described department of assembly (36) of described upper end (13) assembling.
2. ignition coil as claimed in claim 1 is characterized in that, crack growth limiter (60) comprises:
First fitting portion (62), its from the department of assembly interior week of (36) radially to projecting inward; And
Second fitting portion (65), its outer periphery from retainer (41) stretches out, with overlapping and chimeric with first fitting portion (62).
3. ignition coil as claimed in claim 1 is characterized in that, crack growth limiter (60) comprises:
First projection (82), its from the department of assembly interior week of (36) radially to projecting inward; And
Second projection (86), its outer periphery from retainer (41) stretches out, with overlapping with first projection (82).
4. ignition coil as claimed in claim 1 also comprises: binding agent accumulation chamber (110,115), it is positioned on the periphery of upper end (13) assembles binding agent (112,117), so that department of assembly (36) are bonded on the upper end (13).
5. ignition coil for internal combustion engine comprises:
Cylindrical shape first housing (12) is wherein holding center magnetic core (15), is being placed in the primary coil (21) in center magnetic core (15) outside and is being placed in secondary coil (17) outside the center magnetic core (15);
Second housing (32), it has installation portion (33) and cylindrical shape department of assembly (36), and described cylindrical shape department of assembly (36) is assemblied on the periphery of upper end (13) of first housing (12);
Retainer (41), it is arranged on the upper end of primary and secondary coil (21,17), to limit their relative position;
Annular insulating resin (72), it is filled at least by primary and secondary coil (21, in the toroidal cavity (71) that the upper end (13) of topmost 17), first housing (12) and the department of assembly (36) of second housing (32) limit, and closely contact with department of assembly (36); And
Crack growth limiter, it is formed by in the part of the part of second housing (32) and retainer (41) any one, wherein described any one combination interface (77) that combines with described insulating resin (72) along the described department of assembly of axial overlap (36) of described first housing (12) and fitting surface (76) and described department of assembly (36) of described upper end (13) assembling in the described part of the described part of second housing (32) and retainer (41).
6. ignition coil as claimed in claim 5 is characterized in that, crack growth limiter is following any:
First projection (92), its from the department of assembly interior week of (36) radially to projecting inward; And
Second projection (96), its outer periphery from retainer (41) is outwards protruded.
7. ignition coil as claimed in claim 5 also comprises: binding agent accumulation chamber (110,115), it is positioned on the periphery of upper end (13) assembles binding agent (112,117), so that department of assembly (36) are bonded on the upper end (13).
8. ignition coil for internal combustion engine comprises:
Cylindrical shape first housing (12) is wherein holding center magnetic core (15), is being placed in the primary coil (21) in center magnetic core (15) outside and is being placed in secondary coil (17) outside the center magnetic core (15);
Second housing (32) is wherein holding igniter (34), and has cylindrical shape department of assembly (36), and described cylindrical shape department of assembly (36) is assemblied on the periphery of upper end (13) of first housing (12);
Annular insulating resin (72), it is filled at least by primary and secondary coil (21, in the toroidal cavity (71) that the upper end (13) of topmost 17), first housing (12) and the department of assembly (36) of second housing (32) limit, and closely contact with department of assembly (36); And
Crack growth limiter (105), it is placed between the fitting surface (76) of igniter (34) in second housing (32) and department of assembly (36) and upper end (13) assembling, the combination interface (77) that combines with described insulating resin (72) with the described fitting surface of axial overlap (76) and described department of assembly (36) along described first housing (12).
9. ignition coil as claimed in claim 8, it is characterized in that, crack growth limiter (105) comprises belt, and described belt and is embedded in the insulating resin (72) in second housing (32) at least or is bonded on the lower surface of igniter (34) in the form of sheets.
10. ignition coil as claimed in claim 8 also comprises: binding agent accumulation chamber (110,115), it is positioned on the periphery of upper end (13) assembles binding agent (112,117), so that department of assembly (36) are bonded on the upper end (13).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004140000 | 2004-05-10 | ||
| JP140000/2004 | 2004-05-10 | ||
| JP065458/2005 | 2005-03-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1697101A CN1697101A (en) | 2005-11-16 |
| CN100346429C true CN100346429C (en) | 2007-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100687753A Active CN100346429C (en) | 2004-05-10 | 2005-05-10 | Ignition coil for internal combustion engine |
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| Country | Link |
|---|---|
| CN (1) | CN100346429C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018130492B4 (en) * | 2018-11-30 | 2023-02-09 | Borgwarner Ludwigsburg Gmbh | ignition coil |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1123883A (en) * | 1994-09-26 | 1996-06-05 | 日本电装株式会社 | Ignition coils |
| CN1039147C (en) * | 1994-12-07 | 1998-07-15 | 三菱电机株式会社 | Internal Combustion Engine Ignition |
| CN1039444C (en) * | 1994-12-06 | 1998-08-05 | 日本电装株式会社 | Ignition coils for internal combustion engines |
| US6252483B1 (en) * | 1995-08-25 | 2001-06-26 | Nippondenso Co., Ltd. | Slant winding electromagnetic coil and ignition coil for internal combustion engine using same |
| US6378514B1 (en) * | 1999-12-01 | 2002-04-30 | Hitachi, Ltd. | Igniter for internal combustion engine |
| JP2003303724A (en) * | 2001-05-08 | 2003-10-24 | Denso Corp | Ignition coil for internal combustion engine |
-
2005
- 2005-05-10 CN CNB2005100687753A patent/CN100346429C/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1123883A (en) * | 1994-09-26 | 1996-06-05 | 日本电装株式会社 | Ignition coils |
| CN1039444C (en) * | 1994-12-06 | 1998-08-05 | 日本电装株式会社 | Ignition coils for internal combustion engines |
| CN1039147C (en) * | 1994-12-07 | 1998-07-15 | 三菱电机株式会社 | Internal Combustion Engine Ignition |
| US6252483B1 (en) * | 1995-08-25 | 2001-06-26 | Nippondenso Co., Ltd. | Slant winding electromagnetic coil and ignition coil for internal combustion engine using same |
| US6378514B1 (en) * | 1999-12-01 | 2002-04-30 | Hitachi, Ltd. | Igniter for internal combustion engine |
| JP2003303724A (en) * | 2001-05-08 | 2003-10-24 | Denso Corp | Ignition coil for internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1697101A (en) | 2005-11-16 |
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