JPH1194252A - Glow plug and manufacture of the same - Google Patents
Glow plug and manufacture of the sameInfo
- Publication number
- JPH1194252A JPH1194252A JP9273552A JP27355297A JPH1194252A JP H1194252 A JPH1194252 A JP H1194252A JP 9273552 A JP9273552 A JP 9273552A JP 27355297 A JP27355297 A JP 27355297A JP H1194252 A JPH1194252 A JP H1194252A
- Authority
- JP
- Japan
- Prior art keywords
- press
- heater
- glow plug
- housing
- fitting portion
- 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
Links
Landscapes
- Resistance Heating (AREA)
Abstract
Description
【0001】[0001]
【技術分野】本発明は,ディーゼルエンジンの予熱に用
いるグロープラグ及びその製造方法に関する。TECHNICAL FIELD The present invention relates to a glow plug used for preheating a diesel engine and a method for manufacturing the same.
【0002】[0002]
【従来技術】ディーゼルエンジン予熱用のグロープラグ
としては,図9に示すごとく,シーズ型のグロープラグ
9がある。グロープラグ9は,同図に示すごとく,先端
を閉止した断面U字状の金属チューブ91内に絶縁粉末
2を充填するとともに,発熱用のヒートコイル3を収納
したヒータ90を有している。また,ヒータ90には,
金属チューブ91の開口端から通電用の中軸4の先端を
絶縁粉末2内に埋設してこれを一体的に連結してある。2. Description of the Related Art As a glow plug for preheating a diesel engine, there is a sheath type glow plug 9 as shown in FIG. As shown in the figure, the glow plug 9 has a heater 90 in which a metal tube 91 having a U-shaped cross section whose end is closed is filled with the insulating powder 2 and the heat coil 3 for heat generation is housed. Also, the heater 90 includes
From the open end of the metal tube 91, the leading end of the central shaft 4 for energization is embedded in the insulating powder 2 and connected integrally.
【0003】また上記ヒートコイル3は,同図に示すご
とく,その一端31を金属チューブ91の先端内面に接
合してあると共に,他端32を中軸4の先端に接続して
ある。そして,ヒータ90とハウジング5とは,ヒータ
90の圧入部95をハウジング5の嵌合部55に圧入嵌
合させて固定してある。なお,図9における符号71は
ナット,72は樹脂製のブッシュ,73は絶縁弾性材料
からなるOリング,74は樹脂製のワッシャーである。As shown in FIG. 1, the heat coil 3 has one end 31 joined to the inner surface of the tip of a metal tube 91 and the other end 32 connected to the tip of the center shaft 4. The heater 90 and the housing 5 are fixed by press-fitting the press-fit portion 95 of the heater 90 to the fitting portion 55 of the housing 5. In FIG. 9, reference numeral 71 denotes a nut, 72 denotes a resin bush, 73 denotes an O-ring made of an insulating elastic material, and 74 denotes a resin washer.
【0004】このグロープラグ9を製造するに当たって
は,まず上記金属チューブ91へのヒートコイル3及び
中軸4の挿入工程,絶縁粉末の充填工程,金属チューブ
91全体を外周から加圧縮径させるスエージング加工工
程を経て,中軸4を一体的に接合したヒータ90を作製
する。その後,ヒータ90とハウジング5との圧入固定
を行う。In manufacturing the glow plug 9, first, a step of inserting the heat coil 3 and the center shaft 4 into the metal tube 91, a step of filling the insulating powder, and a swaging process for compressing and compressing the entire metal tube 91 from the outer periphery. Through the steps, a heater 90 in which the center shaft 4 is integrally joined is manufactured. After that, the heater 90 and the housing 5 are press-fitted and fixed.
【0005】[0005]
【解決しようとする課題】しかしながら,上記従来のグ
ロープラグ及びその製造方法には,次の問題がある。即
ち,ヒータ90とハウジング5との圧入固定は,グロー
プラグ使用時の高圧力(約150気圧)に耐えうるよう
な十分な気密性を保持するよう行われることが必要とさ
れる。そのため,従来は,ヒータの圧入部95の真円度
を高くし,かつ,その表面粗さを鏡面状態まで小さくし
ていた。そして,そのためには,非常に高価な高性能ス
エージング機械を使用する必要があった。それ故,従来
の圧入固定によるグロープラグの製造方法においては,
ヒータとハウジングとの気密性保持が容易ではなかっ
た。However, the above-mentioned conventional glow plug and its manufacturing method have the following problems. That is, it is necessary that the press-fitting and fixing between the heater 90 and the housing 5 be performed so as to maintain sufficient airtightness to withstand a high pressure (about 150 atm) when the glow plug is used. For this reason, conventionally, the roundness of the press-fit portion 95 of the heater has been increased, and the surface roughness has been reduced to a mirror surface state. For that purpose, it was necessary to use a very expensive high-performance swaging machine. Therefore, in the conventional method of manufacturing a glow plug by press-fitting and fixing,
It was not easy to maintain the airtightness between the heater and the housing.
【0006】一方,従来においては,上記圧入固定を行
わない製造方法として,例えば特公昭59−52726
号公報に示されているごとく,ヒータの外周に周溝を設
けておき,これをハウジング内に挿入して,ハウジング
を外方からかしめることによりヒータの周溝とハウジン
グの内面とを嵌合させて気密性を得る方法がある。しか
しながら,この方法においては,ハウジングをかしめる
工程が新たに必要となるという問題がある。On the other hand, conventionally, as a manufacturing method without press-fitting and fixing, for example, Japanese Patent Publication No. 59-52726
As shown in the publication, a circumferential groove is provided on the outer periphery of the heater, which is inserted into the housing, and the housing is crimped from the outside to fit the circumferential groove of the heater with the inner surface of the housing. There is a method to obtain airtightness. However, this method has a problem that a step of caulking the housing is newly required.
【0007】本発明は,かかる従来の問題点に鑑みてな
されたもので,ハウジングとヒータとの気密性を容易に
保持することができるグロープラグ及びその製造方法を
提供しようとするものである。The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a glow plug capable of easily maintaining the airtightness between a housing and a heater, and a method for manufacturing the same.
【0008】[0008]
【課題の解決手段】請求項1の発明は,内孔を設けたハ
ウジングと,該ハウジングの上記内孔内に圧入固定した
ヒータと,該ヒータへの通電を行うための中軸とを有
し,かつ,上記ハウジングと上記ヒータとの圧入固定
は,上記ハウジングの内孔内に設けた嵌合部と上記ヒー
タの外周に設けた圧入部とを圧入嵌合させて行っている
グロープラグにおいて,上記圧入部の外周面又は上記嵌
合部の内周面には,グロープラグの軸芯方向に対して非
平行なパターンに配された凹凸部を有する凹凸面を設け
てあることを特徴とするグロープラグにある。According to a first aspect of the present invention, there is provided a housing having an inner hole, a heater press-fitted and fixed in the inner hole of the housing, and a center shaft for supplying power to the heater. In the glow plug, the housing and the heater are press-fitted and fixed by press-fitting a fitting portion provided in an inner hole of the housing and a press-fitting portion provided on the outer periphery of the heater. The glow is characterized in that the outer peripheral surface of the press-fitting portion or the inner peripheral surface of the fitting portion has an uneven surface having uneven portions arranged in a pattern non-parallel to the axial direction of the glow plug. In the plug.
【0009】本発明において最も注目すべきことは,上
記圧入部の外周面又は上記嵌合部の内周面には,グロー
プラグの軸芯方向に対して非平行なパターンに配された
凹凸部を有する凹凸面を設けてあることである。It is most remarkable in the present invention that the outer peripheral surface of the press-fitting portion or the inner peripheral surface of the fitting portion has uneven portions arranged in a pattern not parallel to the axial direction of the glow plug. Is provided.
【0010】凹凸面は,上記のごとく,グロープラグの
軸芯方向に対して非平行なパターンに配された凹凸部を
有している。非平行なパターンとしては,グロープラグ
の軸芯方向に対して直交する方向,あるいは所定の傾斜
角をもって斜交する方向に設けた,線状,格子状等のパ
ターンがある。また,上記軸芯方向に非平行な線をラン
ダムに配したパターンや,散点状のパターンをとること
もできる。As described above, the uneven surface has uneven portions arranged in a pattern non-parallel to the axial direction of the glow plug. Examples of the non-parallel pattern include linear and lattice patterns provided in a direction orthogonal to the axis of the glow plug or in a direction oblique with a predetermined inclination angle. Further, a pattern in which non-parallel lines in the axial direction are randomly arranged, or a scattered pattern can be used.
【0011】また,上記凹凸部とは,他の面よりも突出
した突出部あるい他の面よりも凹んだ凹部の少なくとも
一方を有する部分をいう。そして,上記の非平行なパタ
ーンは,上記凹凸部の配置のパターンを意味する。ま
た,上記凹凸面は,上記圧入部又は嵌合部のいずれかに
設ける。この場合,いずれに凹凸面を設けるかは,両者
の硬度によって判断し,硬度が高い方に設けることが好
ましい。これにより,両者の密着性を一層向上させるこ
とができる。[0011] Further, the uneven portion means a portion having at least one of a protruding portion protruding from the other surface or a concave portion recessed from the other surface. The non-parallel pattern means a pattern of the arrangement of the concave and convex portions. Further, the uneven surface is provided on either the press-fitting portion or the fitting portion. In this case, it is preferable to determine which of the uneven surfaces is to be provided based on the hardness of both, and to provide the higher hardness. Thereby, the adhesion between the two can be further improved.
【0012】次に,本発明の作用効果につき説明する。
本発明のグロープラグは,上記ヒータとハウジングとの
圧入固定部分となる上記圧入部又は嵌合部に上記凹凸面
を設けてある。そのため,ヒータとハウジングの圧入固
定部は,十分な気密性を保持することができる。Next, the operation and effect of the present invention will be described.
In the glow plug according to the present invention, the uneven surface is provided on the press-fitting portion or the fitting portion which is a press-fitting fixed portion between the heater and the housing. Therefore, the heater and the press-fitting fixed portion of the housing can maintain sufficient airtightness.
【0013】この理由は,次のように考えられる。即
ち,上記圧入部又は嵌合部のいずれかに凹凸面を設けて
ある場合には,圧入嵌合を行うことによって,上記凹凸
面の凹凸部が接触する対向面にめり込んだ,あるいは対
向面をめり込ませた状態となる。また,この凹凸部は,
上記のごとくグロープラグの軸芯方向と非平行に配され
ている。The reason is considered as follows. That is, when the press-fitting portion or the fitting portion has an uneven surface, the press-fitting is performed so that the uneven surface of the uneven surface is sunk into the opposing surface or the opposing surface is contacted. It is in a state of being immersed. Also, this uneven part
As described above, they are arranged non-parallel to the axial direction of the glow plug.
【0014】そのため,圧入部と嵌合部との接触部分の
なかでも,上記凹凸部が配置されている部分は非常に強
固に密着し,かつ,空気の導通を妨げる障壁のごとき役
割を奏する。それ故,グロープラグを高圧下で使用した
場合にも,ヒータとハウジングとの間に進入しようとす
る空気をくい止め,気密性を保持することができると考
えられる。Therefore, of the contact portions between the press-fitting portion and the fitting portion, the portion where the uneven portion is disposed is very firmly adhered to and plays a role as a barrier for preventing air conduction. Therefore, even when the glow plug is used under a high pressure, it is considered that air entering between the heater and the housing can be blocked and airtightness can be maintained.
【0015】したがって,本発明によれば,上記圧入部
の外周面又は上記嵌合部の内周面に,上記凹凸面を設け
ることによって,ハウジングとヒータとの気密性を容易
に保持することができるグロープラグを提供することが
できる。Therefore, according to the present invention, the airtightness between the housing and the heater can be easily maintained by providing the uneven surface on the outer peripheral surface of the press-fitting portion or the inner peripheral surface of the fitting portion. A glow plug that can be provided.
【0016】次に,請求項2の発明のように,上記凹凸
面の表面粗さ(Rz)は25μm以下であることが好ま
しい。25μm未満を超える場合には,ヒータとハウジ
ングとの気密性向上効果が少ないという問題がある。Next, as in the second aspect of the present invention, the surface roughness (Rz) of the uneven surface is preferably 25 μm or less. If it exceeds 25 μm, there is a problem that the effect of improving the airtightness between the heater and the housing is small.
【0017】また,請求項3の発明のように,上記凹凸
面は,上記圧入部又は上記嵌合部の表面積の20%以上
を占めていることが好ましい。20%未満の場合には,
上記の凹凸面の存在による気密性向上効果が十分に発揮
されないという問題がある。そのため,より好ましくは
90%以上がよい。尚,上限値は,物理的に100%で
ある。It is preferable that the uneven surface occupies 20% or more of the surface area of the press-fitting portion or the fitting portion. If less than 20%
There is a problem that the effect of improving the airtightness due to the presence of the uneven surface is not sufficiently exhibited. Therefore, it is more preferably 90% or more. Note that the upper limit is physically 100%.
【0018】また,請求項4の発明のように,上記凹凸
面の上記パターンは,線状パターンであることが好まし
い。ここでいう線状パターンとは,例えば後述する図に
示すごとく,グロープラグの軸芯方向と所定角度を持っ
た斜めの線を連続又は断続的に配置したパターンをい
う。この場合には,例えば,切削加工又は研削加工と同
時に容易に凹凸部を設けることができる。Further, it is preferable that the pattern of the uneven surface is a linear pattern. The linear pattern referred to here is, for example, a pattern in which oblique lines having a predetermined angle with respect to the axial direction of the glow plug are continuously or intermittently arranged as shown in the drawings described later. In this case, for example, the concave and convex portions can be easily provided simultaneously with the cutting or grinding.
【0019】また,請求項5の発明のように,上記線状
パターンは,グロープラグの軸芯方向に対して30度以
上傾斜していることが好ましい。30度未満の場合に
は,ヒータとハウジングとの気密性向上効果が十分に得
られないという問題がある。Further, it is preferable that the linear pattern is inclined at least 30 degrees with respect to the axial center direction of the glow plug. If it is less than 30 degrees, there is a problem that the effect of improving the airtightness between the heater and the housing cannot be sufficiently obtained.
【0020】次に,請求項6の発明のように,内孔を設
けたハウジングと,該ハウジングの上記内孔内に圧入固
定したヒータと,該ヒータへの通電を行うための中軸と
を有し,かつ,上記ハウジングと上記ヒータとの圧入固
定は,上記ハウジングの内孔内に設けた嵌合部と上記ヒ
ータの外周に設けた圧入部とを圧入嵌合させて行ってい
るグロープラグを製造する方法において,上記ヒータと
上記ハウジングとの圧入工程を行う前には,予め,上記
圧入部の外周面又は上記嵌合部の内周面に,グロープラ
グの軸芯方向に対して非平行なパターンに配された凹凸
部を有する凹凸面を設けることを特徴とするグロープラ
グの製造方法がある。Next, as in the sixth aspect of the present invention, there is provided a housing having an inner hole, a heater press-fitted and fixed in the inner hole of the housing, and a center shaft for supplying electricity to the heater. The press-fitting between the housing and the heater is performed by press-fitting a fitting portion provided in an inner hole of the housing and a press-fitting portion provided on the outer periphery of the heater. In the manufacturing method, before performing the step of press-fitting the heater and the housing, the outer peripheral surface of the press-fit portion or the inner peripheral surface of the fitting portion is non-parallel to the axial direction of the glow plug. There is a method for manufacturing a glow plug characterized by providing an uneven surface having uneven portions arranged in a simple pattern.
【0021】本製造方法において注目すべきことは,上
記圧入工程を行う前には,予め,上記圧入部の外周面又
は上記嵌合部の内周面に,上記の凹凸面を設けることで
ある。この凹凸面は,上記のごとく,グロープラグの軸
芯方向に対して非平行なパターンに配された凹凸部を有
するものである。それ故,その後の圧入工程を行うこと
により,気密性に優れた圧入固定部を得ることができ
る。It should be noted that in the present manufacturing method, before performing the press-fitting step, the uneven surface is provided on the outer peripheral surface of the press-fit portion or the inner peripheral surface of the fitting portion in advance. . As described above, the uneven surface has uneven portions arranged in a pattern that is not parallel to the axial direction of the glow plug. Therefore, by performing the subsequent press-fitting step, it is possible to obtain a press-fitting fixed part having excellent airtightness.
【0022】したがって,本製造方法によれば,ハウジ
ングとヒータとの気密性を容易に保持することができる
グロープラグの製造方法を提供することができる。Therefore, according to the present manufacturing method, it is possible to provide a method for manufacturing a glow plug which can easily maintain the airtightness between the housing and the heater.
【0023】また,上記凹凸面を設ける方法としては,
種々の方法をとることができる。特に,請求項7の発明
のように,上記凹凸面は,上記圧入部又は上記嵌合部に
対して切削又は研削を施すことにより設けることが好ま
しい。これにより,上記圧入部又は嵌合部の真円度を容
易に確保しつつ,容易に上記凹凸面を形成することがで
きる。The method of providing the above-mentioned uneven surface is as follows.
Various methods can be taken. In particular, it is preferable that the uneven surface is provided by cutting or grinding the press-fit portion or the fitting portion. This makes it possible to easily form the uneven surface while easily securing the roundness of the press-fit portion or the fitting portion.
【0024】[0024]
実施形態例1 本発明の実施形態例にかかるグロープラグ及びその製造
方法につき,図1〜図3を用いて説明する。本例のグロ
ープラグ1は,図1に示すごとく,内孔50を設けたハ
ウジング5と,ハウジング5の内孔50内に圧入固定し
たヒータ10と,ヒータ10への通電を行うための中軸
4とを有している。First Embodiment A glow plug according to an embodiment of the present invention and a method of manufacturing the glow plug will be described with reference to FIGS. As shown in FIG. 1, the glow plug 1 of the present embodiment includes a housing 5 having an inner hole 50, a heater 10 press-fitted and fixed in the inner hole 50 of the housing 5, and a center shaft 4 for energizing the heater 10. And
【0025】ハウジング5とヒータ10との圧入固定
は,ハウジング5の内孔50内に設けた嵌合部55とヒ
ータ10の外周に設けた圧入部15とを圧入嵌合させて
行っている。そして,圧入部15の外周面には,グロー
プラグ1の軸芯方向に対して非平行なパターンに配され
た凹凸部6を有する凹凸面60を設けてある。The press-fitting of the housing 5 and the heater 10 is performed by press-fitting a fitting portion 55 provided in the inner hole 50 of the housing 5 and a press-fitting portion 15 provided on the outer periphery of the heater 10. On the outer peripheral surface of the press-fitting portion 15, an uneven surface 60 having uneven portions 6 arranged in a pattern non-parallel to the axial direction of the glow plug 1 is provided.
【0026】また,ヒータ10は,図1に示すごとく,
先端111を閉止した断面U字状の金属チューブ11
と,金属チューブ11内に充填した絶縁粉末2を介して
収納したヒートコイル3とよりなる。また,中軸4はそ
の先端41をヒータ10の挿入側端部(金属チューブ1
1の開口端)112から絶縁粉末2内に埋設させてあ
る。また,ヒートコイル3は,その一端31を金属チュ
ーブ11の先端内面に,他端32を中軸4の先端にそれ
ぞれ溶接してある。その他は,従来例と同様である。The heater 10 is provided as shown in FIG.
Metal tube 11 having a U-shaped cross section with its tip 111 closed
And the heat coil 3 housed via the insulating powder 2 filled in the metal tube 11. Also, the center shaft 4 has its tip 41 connected to the insertion side end of the heater 10 (the metal tube 1).
1 (opening end of the opening) 112 and is buried in the insulating powder 2. The heat coil 3 has one end 31 welded to the inner surface of the distal end of the metal tube 11 and the other end 32 welded to the distal end of the center shaft 4. Others are the same as the conventional example.
【0027】次に,このグロープラグ1の製造方法につ
き説明する。本例においては,まず,ヒータ10用の金
属チューブ11を準備すると共に,予めヒートコイル3
の一端を溶接した中軸4を準備する。次いで,ヒートコ
イル3を金属チューブ11内に挿入すると共にヒートコ
イル3の他端と金属チューブ11の先端111の内面を
溶接する。Next, a method of manufacturing the glow plug 1 will be described. In this embodiment, first, a metal tube 11 for the heater 10 is prepared, and the heat coil 3
A central shaft 4 having one end welded is prepared. Next, the heat coil 3 is inserted into the metal tube 11 and the other end of the heat coil 3 and the inner surface of the tip 111 of the metal tube 11 are welded.
【0028】次いで,金属チューブ11内に,上記ヒー
トコイル3及び中軸4の先端を埋めるように絶縁粉末2
としてのマグネシア(MgO)粉末を充填する。次い
で,金属チューブ11の外周面からスエージング加工を
おこない,金属チューブ11を圧縮し,縮径させる。こ
れにより,金属チューブ11内の絶縁粉末2の充填密度
が向上すると共に,中軸4とヒータ10とが一体化す
る。Next, the insulating powder 2 is filled in the metal tube 11 so as to fill the ends of the heat coil 3 and the center shaft 4.
(MgO) powder as a filler. Next, a swaging process is performed from the outer peripheral surface of the metal tube 11, and the metal tube 11 is compressed and reduced in diameter. Thereby, the packing density of the insulating powder 2 in the metal tube 11 is improved, and the center shaft 4 and the heater 10 are integrated.
【0029】次に,本例においては,図2に示すごと
く,ヒータ10の圧入部15に対して研削加工を施す。
この研削加工は,ヒータ10の圧入部15の真円度を向
上させると共に凹凸面60を設けるためのものである。
具体的には,研削加工用の砥石の送り等を調整すること
により,圧入部15の真円度を整えると共に,線状パタ
ーンの凹凸部6を設ける。Next, in the present embodiment, as shown in FIG. 2, the press fitting portion 15 of the heater 10 is subjected to grinding.
This grinding process is for improving the roundness of the press-fitting portion 15 of the heater 10 and for providing the uneven surface 60.
More specifically, the roundness of the press-fitting portion 15 is adjusted by adjusting the feed of a grindstone for grinding, and the uneven portion 6 having a linear pattern is provided.
【0030】この凹凸部6は,圧入部15の表面全体に
均一に設ける。即ち本例の凹凸面60は,圧入部15の
表面積の100%を占めるように設ける。また,本例の
凹凸部6のパターンは,図2に示すごとく,断続的な線
状パターンであり,軸芯方向に対して略直角方向に交差
するように設ける。The uneven portion 6 is provided uniformly on the entire surface of the press-fit portion 15. That is, the uneven surface 60 of this example is provided so as to occupy 100% of the surface area of the press-fitting portion 15. Further, as shown in FIG. 2, the pattern of the concavo-convex portions 6 in this example is an intermittent linear pattern, and is provided so as to intersect in a direction substantially perpendicular to the axis direction.
【0031】次に,図3に示すごとく,ハウジング5を
準備し,ヒータ10をハウジング5に圧入固定する圧入
工程を行う。ハウジング5は,同図に示すごとく,その
軸芯方向に貫通する内孔50を有すると共に,ヒータ挿
入口51から内部へ少し入った所に嵌合部55を有して
いる。また,ハウジング5の材質としては,ヒータ10
よりも硬度の低いものを採用している。Next, as shown in FIG. 3, the housing 5 is prepared, and a press-fitting step of press-fitting and fixing the heater 10 to the housing 5 is performed. As shown in the figure, the housing 5 has an inner hole 50 penetrating in the axial direction thereof, and has a fitting portion 55 at a position slightly inside the heater insertion opening 51. The material of the housing 5 is a heater 10.
The one with lower hardness than that is adopted.
【0032】このハウジング5は,図3に示すごとく,
ヒータ挿入口51を上方に向けてハウジング5をハウジ
ング保治具86上に載置する。次いで,ヒータ固定治具
81に保持されたヒータ10を,中軸4を先頭にして,
ハウジング5の内孔内に挿入し,ヒータ10とハウジン
グ5との仮組を行う。The housing 5 is, as shown in FIG.
The housing 5 is placed on the housing jig 86 with the heater insertion port 51 facing upward. Next, the heater 10 held by the heater fixing jig 81 is moved from the center shaft 4 to the top.
The heater 10 is inserted into the inner hole of the housing 5 and the heater 10 and the housing 5 are temporarily assembled.
【0033】次いで,ヒータ固定治具81によりヒータ
10を強く押圧し,その圧入部15をハウジング5の嵌
合部55に圧入嵌合させる。このとき,ヒータ10の圧
入部15には,予め潤滑剤を塗布しておく。この潤滑剤
は,凹凸面60を設けたことによる圧入固定時の押圧荷
重の増大を防止するためのものである。また,本例にお
いては,この潤滑剤としてフッ素系グリスを用いた。な
お,これに代えてシリコン系グリス,合成炭化水素系グ
リス,ポリグリコール系グリス,フェニエーテル系グリ
ス等を用いることもできる。Next, the heater 10 is strongly pressed by the heater fixing jig 81 to press-fit the press-fit portion 15 into the fitting portion 55 of the housing 5. At this time, a lubricant is applied to the press-fitting portion 15 of the heater 10 in advance. This lubricant is for preventing an increase in the pressing load at the time of press-fitting and fixing due to the provision of the uneven surface 60. In this example, fluorine-based grease was used as the lubricant. Instead of this, silicon-based grease, synthetic hydrocarbon-based grease, polyglycol-based grease, phenyl ether-based grease, or the like can also be used.
【0034】上記圧入固定の完了により,図1に示すご
とく,ヒータ10とハウジング5とが強固に一体化され
たグロープラグ1が得られる。なお,ハウジング5の中
軸突出側には,従来と同様に,ナット71,樹脂製のブ
ッシュ72,絶縁弾性材料からなるOリング73,樹脂
製のワッシャー74を配設する。Upon completion of the press-fitting and fixing, the glow plug 1 in which the heater 10 and the housing 5 are firmly integrated as shown in FIG. 1 is obtained. A nut 71, a resin bush 72, an O-ring 73 made of an insulating elastic material, and a resin washer 74 are disposed on the center shaft protruding side of the housing 5 as in the related art.
【0035】このようにして得られたグロープラグ1
は,ヒータ10とハウジング5との気密性が非常に優れ
たものとなる。即ち,圧入部15には上記凹凸面60を
設けてあるため,上記圧入嵌合を行うことによって,凹
凸面60の凹凸部6が,その接触する嵌合部55にめり
込んだ,あるいはめり込ませた状態となる。また,この
凹凸部6は,上記のごとくグロープラグの軸芯方向と略
直交方向に配されている。The glow plug 1 thus obtained
The airtightness between the heater 10 and the housing 5 is extremely excellent. That is, since the press-fit portion 15 is provided with the uneven surface 60, the press-fitting causes the uneven portion 6 of the uneven surface 60 to be sunk or sunk into the fitting portion 55 that comes into contact therewith. It will be in a state where it was not. The uneven portions 6 are arranged in a direction substantially orthogonal to the axial direction of the glow plug as described above.
【0036】そのため,圧入固定部分における凹凸部6
は,嵌合部55と非常に強固に密着し,かつ,空気の導
通を妨げる障壁のごとき役割を奏する。それ故,グロー
プラグ1を高圧下で使用した場合にも,ヒータ10とハ
ウジング5との間に進入しようとする空気を凹凸部6が
くい止め,気密性を保持することができる。Therefore, the uneven portion 6 in the press-fit fixed portion
Plays a role such as a barrier that tightly adheres tightly to the fitting portion 55 and prevents air conduction. Therefore, even when the glow plug 1 is used under high pressure, the uneven portion 6 can block the air that is going to enter between the heater 10 and the housing 5 and maintain the airtightness.
【0037】また,このような気密性に優れたグロープ
ラグ1の製造は,上記研削時加工における凹凸面60の
形成によって容易に行うことができる。したがって,本
例によれば,ハウジング5とヒータ10との気密性を容
易に保持することができるグロープラグ1及びその製造
方法を提供することができる。The glow plug 1 having excellent airtightness can be easily manufactured by forming the uneven surface 60 in the above-mentioned grinding process. Therefore, according to this example, it is possible to provide the glow plug 1 and the method for manufacturing the glow plug 1 that can easily maintain the airtightness between the housing 5 and the heater 10.
【0038】実施形態例2 本例は,図4に示すごとく,実施形態例1の研削加工に
代えて切削加工を行うことにより,ヒータ10の圧入部
15に凹凸面62を設けたものである。本例の凹凸面6
2は,同図に示すごとく,圧入部15の表面全体に螺旋
状のパターンに凹凸部6を配したものである。その他
は,実施形態例1と同様である。この場合にも,実施形
態例1と同様の効果が得られる。Embodiment 2 In this embodiment, as shown in FIG. 4, a concave-convex surface 62 is provided in the press-fitting portion 15 of the heater 10 by performing cutting instead of grinding in Embodiment 1. . Uneven surface 6 of this example
As shown in FIG. 2, the unevenness portion 6 is arranged in a spiral pattern on the entire surface of the press-fit portion 15, as shown in FIG. Other configurations are the same as those of the first embodiment. In this case, the same effect as that of the first embodiment can be obtained.
【0039】実施形態例3 本例は,図5に示すごとく,実施形態例2の凹凸面62
に代えて,研削加工及びローレット加工等により格子状
パターンの凹凸部6を有する凹凸面63を圧入部15に
設けたものである。その他は,実施形態例2と同様であ
る。この場合にも,実施形態例1と同様の効果が得られ
る。Embodiment 3 As shown in FIG. 5, the present embodiment relates to the uneven surface 62 of Embodiment 2.
Instead, a press-fit portion 15 is provided with a concave-convex surface 63 having a concave-convex portion 6 of a lattice pattern by grinding, knurling, or the like. Others are the same as the second embodiment. In this case, the same effect as that of the first embodiment can be obtained.
【0040】実施形態例4 本例は,図6に示すごとく,ハウジング5の嵌合部55
に凹凸面64を設けた例である。即ち,実施形態例1の
ヒータ10の圧入部15には,研削加工を施しただけで
特に凹凸面60を設ける必要はない。そして,ハウジン
グ5の嵌合部55の表面には,研削加工により,断続的
な線状パターンの凹凸部6を軸芯方向に対して略直角方
向に設けた凹凸面64を形成した。また,ハウジング5
の材質は,ヒータ10よりも硬度が高いものとした。そ
の他は,実施形態例1と同様である。この場合にも,実
施形態例1と同様の効果が得られる。Fourth Embodiment As shown in FIG.
This is an example in which a concave-convex surface 64 is provided. That is, the press-fit portion 15 of the heater 10 according to the first embodiment does not need to be provided with the uneven surface 60 only by grinding. Then, on the surface of the fitting portion 55 of the housing 5, an uneven surface 64 in which the uneven portion 6 of an intermittent linear pattern was provided in a direction substantially perpendicular to the axial direction was formed by grinding. The housing 5
Is harder than the heater 10. Other configurations are the same as those of the first embodiment. In this case, the same effect as that of the first embodiment can be obtained.
【0041】実施形態例5 本例は,図7に示すごとく,実施形態例4の研削加工に
代えて切削加工を行うことにより,ハウジング5の嵌合
部55に凹凸面65を設けたものである。本例の凹凸面
65は,同図に示すごとく,嵌合部55の表面全体に螺
旋状のパターンに凹凸部6を配したものである。その他
は,実施形態例4と同様である。この場合にも,実施形
態例1と同様の効果が得られる。Fifth Embodiment As shown in FIG. 7, in this embodiment, an uneven surface 65 is provided in the fitting portion 55 of the housing 5 by performing cutting instead of grinding in the fourth embodiment. is there. As shown in the figure, the uneven surface 65 of the present example has the uneven portion 6 arranged in a spiral pattern on the entire surface of the fitting portion 55. Others are the same as the fourth embodiment. In this case, the same effect as that of the first embodiment can be obtained.
【0042】実施形態例6 本例は,図8に示すごとく,実施形態例5の凹凸面65
に代えて,研削加工及びローレット加工等により格子状
パターンの凹凸部6を有する凹凸面66を嵌合部55に
設けたものである。その他は,実施形態例5と同様であ
る。この場合にも,実施形態例1と同様の効果が得られ
る。Embodiment 6 As shown in FIG. 8, the present embodiment relates to the uneven surface 65 of Embodiment 5.
Instead, the fitting portion 55 is provided with an uneven surface 66 having the uneven portion 6 in a lattice pattern by grinding, knurling, or the like. Others are the same as the fifth embodiment. In this case, the same effect as that of the first embodiment can be obtained.
【図1】実施形態例1のグロープラグの一部切り欠き断
面図。FIG. 1 is a partially cutaway sectional view of a glow plug according to a first embodiment.
【図2】実施形態例1における,ヒータの凹凸面を示す
説明図。FIG. 2 is an explanatory view showing an uneven surface of a heater in the first embodiment.
【図3】実施形態例1における,ヒータとハウジングと
の圧入固定状態を示す説明図。FIG. 3 is an explanatory diagram showing a press-fit fixed state between a heater and a housing in the first embodiment.
【図4】実施形態例2における,ヒータの凹凸面を示す
説明図。FIG. 4 is an explanatory view showing an uneven surface of a heater in a second embodiment.
【図5】実施形態例3における,ヒータの凹凸面を示す
説明図。FIG. 5 is an explanatory diagram showing an uneven surface of a heater in a third embodiment.
【図6】実施形態例4における,ハウジングの凹凸面を
示す説明図。FIG. 6 is an explanatory diagram showing an uneven surface of a housing in a fourth embodiment.
【図7】実施形態例5における,ハウジングの凹凸面を
示す説明図。FIG. 7 is an explanatory view showing an uneven surface of a housing in a fifth embodiment.
【図8】実施形態例6における,ハウジングの凹凸面を
示す説明図。FIG. 8 is an explanatory view showing an uneven surface of a housing in a sixth embodiment.
【図9】従来例のグロープラグの一部切り欠き断面図。FIG. 9 is a partially cutaway cross-sectional view of a conventional glow plug.
1...グロープラグ, 10...ヒータ, 11...金属チューブ, 15...圧入部, 2...絶縁粉末, 3...ヒートコイル, 4...中軸, 5...ハウジング, 50...内孔, 55...嵌合部, 6...凹凸部, 60...凹凸面, 1. . . Glow plug, 10. . . Heater, 11. . . Metal tube, 15. . . Press-fit part, 2. . . 2. insulating powder; . . Heat coil, 4. . . Center axis, 5. . . Housing, 50. . . Inner bore, 55. . . Fitting part, 6. . . Irregularities, 60. . . Uneven surface,
Claims (7)
グの上記内孔内に圧入固定したヒータと,該ヒータへの
通電を行うための中軸とを有し,かつ,上記ハウジング
と上記ヒータとの圧入固定は,上記ハウジングの内孔内
に設けた嵌合部と上記ヒータの外周に設けた圧入部とを
圧入嵌合させて行っているグロープラグにおいて,上記
圧入部の外周面又は上記嵌合部の内周面には,グロープ
ラグの軸芯方向に対して非平行なパターンに配された凹
凸部を有する凹凸面を設けてあることを特徴とするグロ
ープラグ。1. A housing having an inner hole, a heater press-fitted and fixed in the inner hole of the housing, and a center shaft for energizing the heater. Is fixed by press-fitting a fitting portion provided in an inner hole of the housing with a press-fitting portion provided on the outer periphery of the heater. A glow plug characterized in that an uneven surface having uneven portions arranged in a pattern non-parallel to the axial direction of the glow plug is provided on an inner peripheral surface of the joining portion.
さ(Rz)は25μm以下であることを特徴とするグロ
ープラグ。2. The glow plug according to claim 1, wherein the surface roughness (Rz) of the uneven surface is 25 μm or less.
は,上記圧入部又は上記嵌合部の表面積の20%以上を
占めていることを特徴とするグロープラグ。3. The glow plug according to claim 1, wherein the uneven surface occupies at least 20% of a surface area of the press-fit portion or the fitting portion.
上記凹凸面の上記パターンは,線状パターンであること
を特徴とするグロープラグ。4. The method according to claim 1, wherein:
The glow plug, wherein the pattern on the uneven surface is a linear pattern.
は,グロープラグの軸芯方向に対して30度以上傾斜し
ていることを特徴とするグロープラグ。5. The glow plug according to claim 4, wherein the linear pattern is inclined at least 30 degrees with respect to the axial direction of the glow plug.
グの上記内孔内に圧入固定したヒータと,該ヒータへの
通電を行うための中軸とを有し,かつ,上記ハウジング
と上記ヒータとの圧入固定は,上記ハウジングの内孔内
に設けた嵌合部と上記ヒータの外周に設けた圧入部とを
圧入嵌合させて行っているグロープラグを製造する方法
において,上記ヒータと上記ハウジングとの圧入工程を
行う前には,予め,上記圧入部の外周面又は上記嵌合部
の内周面に,グロープラグの軸芯方向に対して非平行な
パターンに配された凹凸部を有する凹凸面を設けること
を特徴とするグロープラグの製造方法。6. A housing having an inner hole, a heater press-fitted and fixed in the inner hole of the housing, and a center shaft for energizing the heater. The method of manufacturing a glow plug by press-fitting a fitting portion provided in an inner hole of the housing and a press-fitting portion provided on an outer periphery of the heater in the method of manufacturing a glow plug. Before performing the press-fitting step, the outer peripheral surface of the press-fitting portion or the inner peripheral surface of the fitting portion has irregularities arranged in a pattern non-parallel to the axial direction of the glow plug. A method for manufacturing a glow plug, comprising providing an uneven surface.
圧入部又は上記嵌合部に対して切削又は研削を施すこと
により設けることを特徴とするグロープラグの製造方
法。7. The method of manufacturing a glow plug according to claim 6, wherein the uneven surface is provided by cutting or grinding the press-fit portion or the fitting portion.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27355297A JP3843557B2 (en) | 1997-09-19 | 1997-09-19 | Glow plug and manufacturing method thereof |
DE69827571T DE69827571T2 (en) | 1997-09-19 | 1998-09-18 | glow plug |
EP04008758A EP1441179A3 (en) | 1997-09-19 | 1998-09-18 | Glow plug |
EP19980117773 EP0903541B1 (en) | 1997-09-19 | 1998-09-18 | Glow plug |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27355297A JP3843557B2 (en) | 1997-09-19 | 1997-09-19 | Glow plug and manufacturing method thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1194252A true JPH1194252A (en) | 1999-04-09 |
JP3843557B2 JP3843557B2 (en) | 2006-11-08 |
Family
ID=17529412
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27355297A Expired - Lifetime JP3843557B2 (en) | 1997-09-19 | 1997-09-19 | Glow plug and manufacturing method thereof |
Country Status (1)
Country | Link |
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JP (1) | JP3843557B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007333374A (en) * | 2006-05-19 | 2007-12-27 | Ngk Spark Plug Co Ltd | Glow plug and method for manufacturing same |
KR100847270B1 (en) * | 2007-01-24 | 2008-07-18 | 주식회사 유라테크 | Glow plug for internal engine |
JP2012145268A (en) * | 2011-01-12 | 2012-08-02 | Ngk Spark Plug Co Ltd | Metal glow plug |
JP2014092318A (en) * | 2012-11-02 | 2014-05-19 | Ngk Spark Plug Co Ltd | Glow plug and glow plug manufacturing method |
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JPS5367034A (en) * | 1976-11-25 | 1978-06-15 | Ngk Spark Plug Co Ltd | Manufacturing method of theath glow plug |
JPS57196018A (en) * | 1981-05-28 | 1982-12-01 | Hitachi Ltd | Glow plug for use in diesel engine |
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JPS6325416A (en) * | 1986-07-17 | 1988-02-02 | Ngk Spark Plug Co Ltd | Ceramic glow plug |
JPH0480521A (en) * | 1990-07-23 | 1992-03-13 | Ngk Spark Plug Co Ltd | Method for connecting sheath tube and main fitting in sheath type glow plug |
JPH0510340A (en) * | 1990-11-19 | 1993-01-19 | Nippon Piston Ring Co Ltd | Machine element pressed with shaft into coupling member and manufacture thereof |
JPH0560203A (en) * | 1991-06-07 | 1993-03-09 | Nippon Piston Ring Co Ltd | Mechanical element having pressed shaft into fitting member and manufacture thereof |
JPH09153316A (en) * | 1995-11-30 | 1997-06-10 | Ngk Insulators Ltd | Method for jointing core cylinder of composite bushing to flange metal by press-fitting |
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1997
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JPS5367034A (en) * | 1976-11-25 | 1978-06-15 | Ngk Spark Plug Co Ltd | Manufacturing method of theath glow plug |
JPS57196018A (en) * | 1981-05-28 | 1982-12-01 | Hitachi Ltd | Glow plug for use in diesel engine |
JPS5959663U (en) * | 1982-10-06 | 1984-04-18 | 日本特殊陶業株式会社 | Two-wire glow plug |
JPS6325416A (en) * | 1986-07-17 | 1988-02-02 | Ngk Spark Plug Co Ltd | Ceramic glow plug |
JPH0480521A (en) * | 1990-07-23 | 1992-03-13 | Ngk Spark Plug Co Ltd | Method for connecting sheath tube and main fitting in sheath type glow plug |
JPH0510340A (en) * | 1990-11-19 | 1993-01-19 | Nippon Piston Ring Co Ltd | Machine element pressed with shaft into coupling member and manufacture thereof |
JPH0560203A (en) * | 1991-06-07 | 1993-03-09 | Nippon Piston Ring Co Ltd | Mechanical element having pressed shaft into fitting member and manufacture thereof |
JPH09153316A (en) * | 1995-11-30 | 1997-06-10 | Ngk Insulators Ltd | Method for jointing core cylinder of composite bushing to flange metal by press-fitting |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007333374A (en) * | 2006-05-19 | 2007-12-27 | Ngk Spark Plug Co Ltd | Glow plug and method for manufacturing same |
DE102007022619B4 (en) * | 2006-05-19 | 2018-11-08 | Ngk Spark Plug Co., Ltd. | Glow plug and method of making the same |
KR100847270B1 (en) * | 2007-01-24 | 2008-07-18 | 주식회사 유라테크 | Glow plug for internal engine |
JP2012145268A (en) * | 2011-01-12 | 2012-08-02 | Ngk Spark Plug Co Ltd | Metal glow plug |
JP2014092318A (en) * | 2012-11-02 | 2014-05-19 | Ngk Spark Plug Co Ltd | Glow plug and glow plug manufacturing method |
Also Published As
Publication number | Publication date |
---|---|
JP3843557B2 (en) | 2006-11-08 |
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