JP3840344B2 - Multilayer core mounting structure - Google Patents

Multilayer core mounting structure Download PDF

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Publication number
JP3840344B2
JP3840344B2 JP03814099A JP3814099A JP3840344B2 JP 3840344 B2 JP3840344 B2 JP 3840344B2 JP 03814099 A JP03814099 A JP 03814099A JP 3814099 A JP3814099 A JP 3814099A JP 3840344 B2 JP3840344 B2 JP 3840344B2
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JP
Japan
Prior art keywords
support piece
laminated
square
mounting bolt
core
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.)
Expired - Fee Related
Application number
JP03814099A
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Japanese (ja)
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JP2000240548A (en
Inventor
裕司 中田
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Ti Walbro Japan
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Ti Walbro Japan
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Priority to JP03814099A priority Critical patent/JP3840344B2/en
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Description

【０００１】
【発明の属する技術分野】
本発明は内燃機関のフライホイールマグネト方式点火装置、特に点火装置の積層鉄心の取付構造に関するものである。
【０００２】
【従来の技術】
従来は内燃機関のシリンダの側壁に、クランク軸方向へ突出する２本のロツドをシリンダと一体に形成し、ロツドに加工したねじ孔へ、積層鉄心に挿通した取付ボルトを螺合して固定している。ねじ孔を有するロツドをシリンダと一体に設けることは、積層鉄心がシリンダの熱を受けやすく、点火コイルの絶縁性を劣化させる恐れがあるばかりでなく、形状の大なるシリンダのロツドにねじ孔を加工するのに手数がかかり、コストの削減が難しい。
【０００３】
【発明が解決しようとする課題】
本発明の課題は上述の問題に鑑み、クランクケースに結合される補助ケースと一体の支持片に取り付けるようにした、組付けが簡単でコストの節減に役立つ、積層鉄心の取付構造を提供することにある。
【０００４】
【課題を解決するための手段】
上記課題を解決するために、本発明の構成はクランクケースの一側壁に結合した補助ケースに上方へ突出する支持片を一体に設け、該支持片のシリンダ側壁と対向する面に積層鉄心を重ね合せて取付ボルトにより締結し、クランク軸に支持した永久磁石の回転により積層鉄心の点火コイルに高電圧を発生させる積層鉄心の取付構造において、前記積層鉄心に１対の角孔を設ける一方、取付ボルトの基端部に前記角孔に係合する角軸部を設け、取付ボルトの先端側に形成したねじ軸を前記支持片の通孔へ挿通してナツトにより締結したことを特徴とする。
【０００５】
【発明の実施の形態】
本発明では点火コイルを巻装される積層鉄心に角孔を設け、該角孔に取付ボルトの角軸部を嵌合し、取付ボルトのねじ部を支持片の通孔へ挿通してナツトにより締結する。本発明によれば取付ボルトに角軸部を加工するだけでよく、積層鉄心は予め山型に打ち抜くと同時に角孔を打ち抜くことにより、コストの増加を回避し、組付けを容易にできる。
【０００６】
【実施例】
機関２は冷却フイン４を一体に備えるシリンダ３と、シリンダ３の下端部に結合されるクランクケース５とを備えている。クランクケース５の一端側には遠心式クラツチ６を収容する補助ケース７が結合され、補助ケース７と一体に上方へ突出する支持片７ａが形成される。クランク軸の右端部は遠心クラツチ６を介して、補助ケース７に支持した出力軸８ａに回転を伝達するようになつている。点火装置１１は山型の積層鉄心１２と点火コイル１３とからなり、積層鉄心１２を支持片７ａに重ね合せ、取付ボルト１４により締結される。
【０００７】
図２に示すように、点火コイル１３は１次コイル１３ａと２次コイル１３ｂとからなり、１次コイル１３ａの両端にはコンデンサ２３が接続される。２次コイル１３ｂは点火栓２４に接続される。クランク軸８の端部に結合される冷却フアンの一部分に永久磁石１０が結合され、永久磁石１０がクランク軸８とともに矢印ｘ方向へ回転する時、積層鉄心１２の点火コイル１３に磁界を及ぼし、１次コイル１３ａに発生する電流がコンデンサ２３へ充電される。永久磁石１０が積層鉄心１２から遠ざかる時、コンデンサ２３が放電し、２次コイル１３ｂに高電圧が発生し、点火栓２４に火花を発生させる。
【０００８】
図３に示すように、本発明によれば、積層鉄心１２の両端部に角孔１２ａが設けられ、取付ボルト１４の基端に形成した角軸部１４ａを角孔１２ａに係合し、取付ボルト１４の先端のねじ部１４ｂを支持片７ａの通孔９へ挿通し、ナツト１６を螺合して締結される。取付ボルト１４に角軸部１４ａが形成されるので、ナツト１６をねじ部１４ｂへ螺合するにあたり、取付ボルト１４が空回りすることなく取付けが容易になる。支持片７ａには普通の丸いねじ孔９を設けるだけで、ねじ溝を加工する必要がないから、経費の節減に役立つ。
【０００９】
図４に示す実施例では、シリンダ３の外側から取付ボルト６をねじ込むことができるようにするために、積層鉄心１２の角孔１２ａにフランジを有するナツト１７に角孔１２ａへ係合する角軸部１７ａを設け、角軸部１７ａに形成したねじ孔１７ｂへ、支持片７ａの通孔９へ挿通した取付ボルト１５を螺合して、積層鉄心１２を支持片７ａに固定するようにしたものである。この実施例では、普通の取付ボルト１５をシリンダ３と反対側からねじ込むことができるので作業が容易になる。
【００１０】
【発明の効果】
本発明は上述のように、クランクケースの一側壁に結合した補助ケースに上方へ突出する支持片を一体に設け、該支持片のシリンダ側壁と対向する面に積層鉄心を重ね合せて取付ボルトにより締結し、クランク軸に支持した永久磁石の回転により積層鉄心の点火コイルに高電圧を発生させる積層鉄心の取付構造において、前記積層鉄心に１対の角孔を設ける一方、取付ボルトの基端部に前記角孔に係合する角軸部を設け、取付ボルトの先端側に形成したねじ軸を前記支持片の通孔へ挿通してナツトにより締結したものであり、支持片の積層鉄心の取付部には丸孔を設けるだけでよく、加工が容易になる。
【００１１】
積層鉄心の取付後の微調整が可能になる。
【００１２】
積層鉄心に取付ボルトを係合することにより、シリンダ壁部に対するねじ孔の加工が不要になり、積層鉄心の取付けに自由度が広がり、コスト節減にもなる。
【図面の簡単な説明】
【図１】本発明に係る積層鉄心の取付構造の正面断面図である。
【図２】点火装置の原理的構成を示す回路図である。
【図３】積層鉄心の取付構造を分解して示す斜視図である。
【図４】本発明の一部変更実施例に係る積層鉄心の取付構造の正面断面図である。
【符号の説明】
ｘ：矢印 ２：機関 ３：シリンダ ４：冷却フイン ５：クランクケース ６：遠心クラツチ ７：補助ケース ７ａ：支持片 ８：クランク軸 ８ａ：出力軸 ９：ボルト挿通孔 １０：永久磁石 １１：点火装置 １２：積層鉄心 １２ａ：角孔 １３：点火コイル １３ａ：１次コイル １３ｂ：２次コイル １４：取付ボルト １４ａ：角軸部 １４ｂ：ねじ部 １５：取付ボルト １６：ナット １７：ナット １７ａ：角軸部 １７ｂ：ねじ孔 ２１：電源バツテリ
２２：スイツチ ２３：コンデンサ ２４：点火栓[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flywheel magneto ignition device for an internal combustion engine, and more particularly to a structure for mounting a laminated core of the ignition device.
[0002]
[Prior art]
Conventionally, two rods protruding in the crankshaft direction are formed integrally with the cylinder side wall of the cylinder of the internal combustion engine, and the mounting bolts inserted through the laminated iron core are screwed into the screw holes machined into the rods and fixed. ing. Providing a rod with a screw hole integrally with the cylinder is not only easy for the laminated iron core to receive the heat of the cylinder and deteriorating the insulation of the ignition coil, but also has a screw hole in the cylinder rod with a large shape. It takes time to process, and it is difficult to reduce costs.
[0003]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a mounting structure for a laminated core that is easy to assemble and is useful for cost reduction, and is attached to a support piece integrated with an auxiliary case coupled to a crankcase. It is in.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the configuration of the present invention is such that a support piece protruding upward is integrally provided on an auxiliary case coupled to one side wall of a crankcase, and a laminated iron core is stacked on a surface of the support piece facing the cylinder side wall. In addition, in the laminated core mounting structure in which a high voltage is generated in the ignition coil of the laminated core by rotating the permanent magnet supported by the crankshaft, a pair of square holes are provided in the laminated core, A square shaft portion that engages with the square hole is provided at the base end portion of the bolt, and a screw shaft formed on the distal end side of the mounting bolt is inserted into the through hole of the support piece and fastened with a nut.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a square hole is provided in the laminated iron core around which the ignition coil is wound, and the square shaft portion of the mounting bolt is fitted into the square hole, and the screw portion of the mounting bolt is inserted into the through hole of the support piece. Conclude. According to the present invention, it is only necessary to process the square shaft portion on the mounting bolt, and the laminated iron core is punched into a mountain shape in advance, and at the same time, the square hole is punched, thereby avoiding an increase in cost and facilitating assembly.
[0006]
【Example】
The engine 2 includes a cylinder 3 that is integrally provided with a cooling fin 4 and a crankcase 5 that is coupled to a lower end portion of the cylinder 3. An auxiliary case 7 that accommodates the centrifugal clutch 6 is coupled to one end side of the crankcase 5, and a support piece 7 a that protrudes upward integrally with the auxiliary case 7 is formed. The right end of the crankshaft transmits rotation to the output shaft 8 a supported by the auxiliary case 7 via the centrifugal clutch 6. The ignition device 11 includes a mountain-shaped laminated iron core 12 and an ignition coil 13. The laminated iron core 12 is superposed on the support piece 7 a and fastened by a mounting bolt 14.
[0007]
As shown in FIG. 2, the ignition coil 13 includes a primary coil 13a and a secondary coil 13b, and capacitors 23 are connected to both ends of the primary coil 13a. The secondary coil 13 b is connected to the spark plug 24. A permanent magnet 10 is coupled to a part of the cooling fan coupled to the end of the crankshaft 8, and when the permanent magnet 10 rotates in the direction of the arrow x together with the crankshaft 8, a magnetic field is applied to the ignition coil 13 of the laminated iron core 12, The current generated in the primary coil 13a is charged to the capacitor 23. When the permanent magnet 10 moves away from the laminated core 12, the capacitor 23 is discharged, a high voltage is generated in the secondary coil 13b, and a spark is generated in the spark plug 24.
[0008]
As shown in FIG. 3, according to the present invention, square holes 12a are provided at both end portions of the laminated core 12, and the square shaft portions 14a formed at the base ends of the mounting bolts 14 are engaged with the square holes 12a for attachment. The threaded portion 14b at the tip of the bolt 14 is inserted into the through hole 9 of the support piece 7a, and the nut 16 is screwed and fastened. Since the square shaft portion 14a is formed on the mounting bolt 14, when the nut 16 is screwed to the screw portion 14b, the mounting bolt 14 does not rotate freely and the mounting is facilitated. Since the support piece 7a is simply provided with a normal round screw hole 9, it is not necessary to process a screw groove, which helps to save costs.
[0009]
In the embodiment shown in FIG. 4, in order to enable the mounting bolt 6 to be screwed from the outside of the cylinder 3, a square shaft that engages the square hole 12 a in a nut 17 having a flange in the square hole 12 a of the laminated core 12. A portion 17a is provided, and a mounting bolt 15 inserted into the through hole 9 of the support piece 7a is screwed into a screw hole 17b formed in the square shaft portion 17a to fix the laminated iron core 12 to the support piece 7a. It is. In this embodiment, the normal mounting bolt 15 can be screwed in from the side opposite to the cylinder 3, so that the operation becomes easy.
[0010]
【The invention's effect】
As described above, according to the present invention, a support piece that protrudes upward is integrally provided on an auxiliary case coupled to one side wall of a crankcase, and a laminated iron core is superimposed on a surface of the support piece that faces the cylinder side wall. In a laminated core mounting structure in which a high voltage is generated in an ignition coil of a laminated core by rotating a permanent magnet that is fastened and supported on a crankshaft, a pair of square holes are provided in the laminated core, while a base end portion of a mounting bolt Provided with a square shaft portion that engages with the square hole, a screw shaft formed on the front end side of the mounting bolt is inserted into the through hole of the support piece and fastened with a nut, and the laminated core of the support piece is attached. It is only necessary to provide a round hole in the part, and processing becomes easy.
[0011]
Fine adjustment after installation of the laminated core becomes possible.
[0012]
By engaging the mounting bolt with the laminated iron core, it is not necessary to form a screw hole in the cylinder wall, and the degree of freedom for attaching the laminated iron core is increased, thereby reducing cost.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a laminated core mounting structure according to the present invention.
FIG. 2 is a circuit diagram showing a basic configuration of an ignition device.
FIG. 3 is an exploded perspective view showing a laminated iron core mounting structure.
FIG. 4 is a front sectional view of a laminated core mounting structure according to a partially modified embodiment of the present invention.
[Explanation of symbols]
x: arrow 2: engine 3: cylinder 4: cooling fin 5: crankcase 6: centrifugal clutch 7: auxiliary case 7a: support piece 8: crankshaft 8a: output shaft 9: bolt insertion hole 10: permanent magnet 11: ignition device 12: Laminated iron core 12a: Square hole 13: Ignition coil 13a: Primary coil 13b: Secondary coil 14: Mounting bolt 14a: Square shaft portion 14b: Screw portion 15: Mounting bolt 16: Nut 17: Nut 17a: Square shaft portion 17b: Screw hole 21: Power supply battery 22: Switch 23: Capacitor 24: Spark plug

Claims (2)

クランクケースの一側壁に結合した補助ケースに上方へ突出する支持片を一体に設け、該支持片のシリンダ側壁と対向する面に積層鉄心を重ね合せて取付ボルトにより締結し、クランク軸に支持した永久磁石の回転により積層鉄心の点火コイルに高電圧を発生させる積層鉄心の取付構造において、前記積層鉄心に１対の角孔を設ける一方、取付ボルトの基端部に前記角孔に係合する角軸部を設け、取付ボルトの先端側に形成したねじ軸を前記支持片の通孔へ挿通してナツトにより締結したことを特徴とする積層鉄心の取付構造。A support piece projecting upward is integrally provided on the auxiliary case coupled to one side wall of the crankcase, and a laminated iron core is superimposed on the surface of the support piece facing the cylinder side wall and fastened with a mounting bolt, and supported on the crankshaft. In a laminated core mounting structure in which a high voltage is generated in an ignition coil of a laminated core by rotation of a permanent magnet, a pair of square holes are provided in the laminated core, and a base end portion of a mounting bolt is engaged with the square hole. A laminated iron core mounting structure characterized in that a square shaft portion is provided, and a screw shaft formed on the front end side of the mounting bolt is inserted into the through hole of the support piece and fastened with a nut. クランクケースの一側壁に結合した補助ケースに上方へ突出する支持片を一体に設け、該支持片のシリンダ側壁と対向する面に積層鉄心を重ね合せて取付ボルトにより締結し、クランク軸に支持した永久磁石の回転により積層鉄心の点火コイルに高電圧を発生させる積層鉄心の取付構造において、前記積層鉄心に１対の角孔を設け、該角孔の一端側に該角孔に係合する角軸部を有するナツトを嵌合し、支持片に挿通した取付ボルトの先端を前記ナツトの角軸部に形成したねじ孔へ螺合したことを特徴とする積層鉄心の取付構造。A support piece projecting upward is integrally provided on the auxiliary case coupled to one side wall of the crankcase, and a laminated iron core is superimposed on the surface of the support piece facing the cylinder side wall and fastened with a mounting bolt, and supported on the crankshaft. In the mounting structure of the laminated core in which a high voltage is generated in the ignition coil of the laminated core by the rotation of the permanent magnet, a pair of square holes are provided in the laminated core, and an angle that engages the square hole at one end side of the square hole A mounting structure for a laminated iron core, wherein a nut having a shaft portion is fitted, and a tip end of a mounting bolt inserted into a support piece is screwed into a screw hole formed in a square shaft portion of the nut.
JP03814099A 1999-02-17 1999-02-17 Multilayer core mounting structure Expired - Fee Related JP3840344B2 (en)

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JP3840344B2 true JP3840344B2 (en) 2006-11-01

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JP5655407B2 (en) * 2010-07-23 2015-01-21 日立工機株式会社 Two-cycle engine and portable work machine equipped with the same

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