JP2012154535A - Glow plug - Google Patents

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JP2012154535A
JP2012154535A JP2011012958A JP2011012958A JP2012154535A JP 2012154535 A JP2012154535 A JP 2012154535A JP 2011012958 A JP2011012958 A JP 2011012958A JP 2011012958 A JP2011012958 A JP 2011012958A JP 2012154535 A JP2012154535 A JP 2012154535A
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glow plug
male screw
tool engaging
flange
engaging portion
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JP5771400B2 (en
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Shinya Murakoshi
新也 村越
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Niterra Co Ltd
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NGK Spark Plug Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a glow plug which can be attached/detached in a space smaller than that of the same class.SOLUTION: The glow plug 1 includes a main bracket 2 which is tubular and in which a male screw part 5 screwed in a female part for fitting a plug in an engine side is formed on an outer peripheral surface, with its rear end provided with a polygonal tool engagement part 6, and a heating body 3 which protrudes to the outside on the tip side, from the main bracket 2. The tool engagement part 6 is formed to be a size insertable into a concentric circle with a diameter same as an outer diameter of the male screw part 5, and a flange 7 whose size is identical with the circle or larger than it is formed between the tool engagement part 6 and the male screw part 5.

Description

本発明は、ディーゼルエンジンを予備加熱するためのグロープラグに関する。   The present invention relates to a glow plug for preheating a diesel engine.

従来のグロープラグを図５により説明する。
グロープラグ１０１は、ディーゼルエンジンを予備加熱するためのものであり、筒状をなす主体金具１０２と、その主体金具１０２の中から先端側の外部に突出する発熱体１０３（例えばシースヒータ）と、主体金具１０２の内部を通って後端側の外部に突出する中軸１０４と、から概略構成される。前記主体金具１０２は、外周面に雄ネジ部１０５を有すると共に後端に六角ボルトの頭部相当形状にした工具係合部１０６が形成されている。なお、図５において符合１０７は、中軸１０４の外部接続端子部１０４ａに通した樹脂製ブッシュ、１０８は外部接続端子部１０４ａに螺合する着脱自在な金属ナットである。
このグロープラグ１０１は、エンジン（図示せず）側のプラグ取付孔に発熱体１０３側から差込み、該プラグ取付孔に形成されたプラグ取付用雌ネジ部に主体金具１０２の前記雄ネジ部１０５を螺合させ、さらに主体金具１０２の前記工具係合部１０６に工具を嵌めて回転させることにより、プラグ取付用雌ネジ部に前記雄ネジ部１０５を締め付けて固定し、或は逆回しして取り外す。 A conventional glow plug will be described with reference to FIG.
The glow plug 101 is for preheating a diesel engine. The glow plug 101 has a cylindrical metal shell 102, a heating element 103 (for example, a sheath heater) that protrudes from the metal shell 102 to the outside on the tip side, A central shaft 104 that projects through the inside of the metal fitting 102 and protrudes to the outside on the rear end side is roughly constituted. The metal shell 102 has a male threaded portion 105 on the outer peripheral surface and a tool engaging portion 106 having a shape corresponding to the head of a hexagon bolt at the rear end. In FIG. 5, reference numeral 107 denotes a resin bush that passes through the external connection terminal portion 104a of the central shaft 104, and 108 denotes a detachable metal nut that is screwed into the external connection terminal portion 104a.
The glow plug 101 is inserted into a plug mounting hole on the engine (not shown) side from the heating element 103 side, and the male screw portion 105 of the metal shell 102 is inserted into the female screw portion for plug mounting formed in the plug mounting hole. By screwing and further fitting and rotating a tool on the tool engaging portion 106 of the metal shell 102, the male screw portion 105 is fastened and fixed to the female screw portion for plug attachment, or removed by rotating it in the reverse direction. .

特開平１１−７２２２９号公報Japanese Patent Laid-Open No. 11-72229

従来のグロープラグ１０１は、工具係合部１０６が一般的な六角形状である場合、その二面幅が主体金具１０２の雄ネジ部１０５の外径以上になるように設定されており、したがって図５に示したように、グロープラグ１０１の中でも工具係合部１０６が最も太い。   In the conventional glow plug 101, when the tool engaging portion 106 has a general hexagonal shape, the width of the two surfaces is set to be equal to or larger than the outer diameter of the male screw portion 105 of the metal shell 102. As shown in FIG. 5, the tool engaging portion 106 is the thickest among the glow plugs 101.

ところで近年、エンジンの高度化・複雑化に伴い部品数が増加し、グロープラグ１０１を着脱するのに必要な広いスペースを確保することが、エンジン設計の自由度を阻害する要因になりつつある。   By the way, in recent years, the number of parts has increased along with the sophistication and complexity of the engine, and securing a wide space necessary for attaching and detaching the glow plug 101 is becoming a factor hindering the degree of freedom in engine design.

本発明は上記に鑑みなされたもので、その目的は、同クラスのものより小さいスペースで着脱可能なグロープラグを提供することにある。   The present invention has been made in view of the above, and an object thereof is to provide a glow plug that can be attached and detached in a space smaller than that of the same class.

上記の目的を達成するため本発明は、筒状をなし外周面にエンジン側のプラグ取付用雌ネジ部に螺合する雄ネジ部が形成され、後端に多角形状の工具係合部を有する主体金具と、
該主体金具の中から先端側の外部に突出する発熱体と、を有するグロープラグであって、
前記工具係合部は、前記雄ネジ部の外径と同径で同心の円より内側に入る大きさに形成され、
さらに該工具係合部と前記雄ネジ部との間に、前記円と同一か又はそれより外側にでる大きさのフランジ部が形成されているグロープラグを提供する。 In order to achieve the above-mentioned object, the present invention has a cylindrical shape and a male threaded portion that is screwed to a female threaded portion for plug attachment on the engine side on the outer peripheral surface, and has a polygonal tool engaging portion at the rear end. A metal shell,
A glow plug having a heating element protruding outward from the front end side of the metal shell,
The tool engaging portion is formed in a size that enters the inside of a concentric circle with the same diameter as the outer diameter of the male screw portion,
Furthermore, the present invention provides a glow plug in which a flange portion having a size that is the same as or larger than the circle is formed between the tool engaging portion and the male screw portion.

また、請求項２に記載したように、前記フランジ部は、非円形である請求項１記載のグロープラグを提供する。   According to a second aspect of the present invention, there is provided the glow plug according to the first aspect, wherein the flange portion is non-circular.

また、請求項３に記載したように、前記フランジ部は、多角形状で工具により回転させ得るものである請求項２記載のグロープラグを提供する。   According to a third aspect of the present invention, there is provided the glow plug according to the second aspect, wherein the flange portion has a polygonal shape and can be rotated by a tool.

また、請求項４に記載したように、前記工具係合部は、Ｈｅｘ８の六角ボルトの頭部相当形状であり、
前記雄ネジ部は、Ｍ１０ネジであり、
前記フランジ部は、Ｈｅｘ１０の六角ボルトの頭部相当形状である請求項３記載のグロープラグを提供する。
なお、ここで「Ｈｅｘ８の六角ボルト」とは、ＪＩＳ規格において二面幅の呼びが「８」で規定される寸法の六角ボルトを指し、同じく「Ｈｅｘ１０の六角ボルト」とは、ＪＩＳ規格において二面幅の呼びが「１０」で規定される寸法の六角ボルトを指す。 Further, as described in claim 4, the tool engaging portion has a shape equivalent to a head of a Hex8 hexagon bolt,
The male screw part is an M10 screw,
The glow plug according to claim 3, wherein the flange portion has a shape corresponding to a head portion of a hexagonal bolt of Hex10.
Here, “Hex8 hexagonal bolt” refers to a hexagonal bolt having a dimension specified by “8” as the width of the two sides in the JIS standard. Similarly, “Hex10 hexagonal bolt” refers to two in the JIS standard. Hexagonal bolts whose dimensions are specified by "10" as the nominal width.

本発明のグロープラグは、工具係合部を雄ネジ部より小さくしたため、雄ネジ部の外径が同じ同クラスのグロープラグに比べて小さいスペースで着脱することができる。したがって、スペースのゆとりができるためエンジン設計の自由度が高まる。
一方、工具係合部を雄ネジ部より小さくすることにより、該雄ネジ部がグロープラグの中の最も太い部分になるため、落下などの衝撃が直に加わるおそれがあり、ネジ山破損のリスクが高まる問題が生じるが、本発明では工具係合部と雄ネジ部との間に、雄ネジ部の外径と同径で同心の円と同一か又はそれより外側にでる大きさのフランジ部を形成したため、落下などの衝撃をフランジ部に受けさせて雄ネジ部に加わる衝撃を緩和させることができる。したがって、ネジ山が破損して取付不能に陥るリスクを減らすことができる。
また、工具係合部を雄ネジ部より小さくすることにより、グロープラグの重心が、雄ネジ部の外径が同じ同クラスのグロープラグに比べて発熱体側に移動し、その分、発熱体側から落下してその衝撃で発熱体を損傷するリスクも高まるが、本発明では工具係合部と雄ネジ部との間にフランジ部を設けたため、グロープラグの重心がフランジ部寄りのポイントに移動して、発熱体側から落下するリスクを小さくすることができる。 In the glow plug of the present invention, since the tool engaging portion is made smaller than the male screw portion, it can be attached and detached in a smaller space than a glow plug of the same class having the same outer diameter of the male screw portion. Therefore, space can be saved, and the degree of freedom in engine design is increased.
On the other hand, by making the tool engaging part smaller than the male screw part, the male screw part becomes the thickest part in the glow plug, so there is a risk of impact such as dropping directly, and the risk of thread damage However, in the present invention, a flange portion having the same diameter as the outer diameter of the male screw portion and the same diameter as the concentric circle or the outside of the outer diameter of the male screw portion is provided between the tool engaging portion and the male screw portion. Therefore, the impact applied to the male screw portion can be reduced by receiving an impact such as a drop on the flange portion. Therefore, it is possible to reduce a risk that the screw thread is damaged and cannot be attached.
In addition, by making the tool engagement part smaller than the male thread part, the center of gravity of the glow plug moves to the heating element side compared to the glow plug of the same class with the same outer diameter of the male thread part. Although the risk of falling and damaging the heating element due to the impact increases, in the present invention, since the flange portion is provided between the tool engaging portion and the male screw portion, the center of gravity of the glow plug moves to a point near the flange portion. Thus, the risk of falling from the heating element side can be reduced.

また、請求項２のグロープラグのように前記フランジ部を非円形にすることにより、該フランジ部が転がり止めになるため、グロープラグが転がりにくい。   Further, since the flange portion is made non-circular by making the flange portion non-circular as in the glow plug of claim 2, the glow plug is difficult to roll.

また、請求項３のグロープラグは、前記フランジ部を多角形状にして工具で回転させ得るようにしたため、もし工具係合部が破損して工具による回転が不能になったとしても、フランジ部を工具係合部の代用品として使用することにより、グロープラグのエンジンへの着脱が可能になる。   In addition, since the glow plug of claim 3 can be rotated with a tool by making the flange portion into a polygonal shape, even if the tool engaging portion is damaged and rotation by the tool becomes impossible, the flange portion is By using it as a substitute for the tool engaging portion, the glow plug can be attached to and detached from the engine.

また、請求項４のグロープラグは、工具係合部のみならずフランジ部をもＪＩＳ規格の六角ボルトの頭部相当形状にしたため、規格化された既存の工具でフランジ部を回転させることができる。したがって殆どの製造工場や整備工場などでフランジ部を工具係合部の代用品として取り扱うことが可能である。   In addition, since the glow plug of claim 4 has not only the tool engaging portion but also the flange portion corresponding to the head portion of a JIS standard hexagon bolt, the flange portion can be rotated with the existing standardized tool. . Therefore, it is possible to handle the flange portion as a substitute for the tool engaging portion in most manufacturing factories and maintenance factories.

要部拡大図を含むグロープラグの斜視図である。It is a perspective view of the glow plug containing the principal part enlarged view. グロープラグの正面図である。It is a front view of a glow plug. 図２のＡ−Ａ線拡大断面図である。It is an AA line expanded sectional view of FIG. 他の形態を示すグロープラグの正面図である。It is a front view of the glow plug which shows another form. 従来のグロープラグの正面図である。It is a front view of the conventional glow plug.

以下に本発明の実施の形態を図面を参照しつつ説明する。
グロープラグ１は、筒状をなす主体金具２と、その主体金具２の中から先端側の外部に突出する発熱体３（例えばシースヒータ）と、主体金具２の内部を通って後端側の外部に突出する中軸４と、から概略構成される。 Embodiments of the present invention will be described below with reference to the drawings.
The glow plug 1 includes a cylindrical metal shell 2, a heating element 3 (for example, a sheath heater) that protrudes from the metal shell 2 to the outside on the front end side, and the exterior of the rear end side through the inside of the metal shell 2. And an intermediate shaft 4 projecting from the center.

［主体金具］
前記主体金具２は、外周面に雄ネジ部５を有すると共に後端に例えば六角形（六角ボルトの頭部相当形状）の工具係合部６が形成されており、さらに雄ネジ部５と工具係合部６との間に非円形のフランジ部７が形成されている。 [Main metal fittings]
The metal shell 2 has a male screw portion 5 on the outer peripheral surface, and a tool engaging portion 6 having, for example, a hexagonal shape (corresponding to the head of a hexagon bolt) is formed at the rear end. A non-circular flange portion 7 is formed between the engaging portion 6.

［主体金具−工具係合部］
前記工具係合部６は、前記雄ネジ部５の外径と同径で同心の円より内側に入る大きさに形成されており、例えば工具係合部６が六角形である場合、その六角形の外接円が雄ネジ部５の外径より小さくなるように設定されている。
したがって雄ネジ部５の外径が同じである同クラスのグロープラグに比べて使用する工具サイズが小さくなり、その分、着脱用に要するスペースも小さくなる。 [Metal fitting-Tool engaging part]
The tool engaging portion 6 is formed to have a size that is the same as the outer diameter of the male screw portion 5 and enters a concentric circle. For example, when the tool engaging portion 6 is a hexagon, The square circumscribed circle is set to be smaller than the outer diameter of the male screw portion 5.
Therefore, the tool size to be used is smaller than that of a glow plug of the same class in which the outer diameter of the male screw portion 5 is the same, and the space required for attachment / detachment is accordingly reduced.

［主体金具−フランジ部］
前記フランジ部７は、雄ネジ部５の外径と同径で同心の円と同一か又はそれより外側にでる大きさに形成されており、例えばフランジ部７が六角形である場合、その六角形の内接円が雄ネジ部５の外径と同一か又はそれより大きくなるように設定されている。
したがってグロープラグ１の中の最も太い部分がフランジ部７になり、そのため、グロープラグ１を平らな水平台８（図２想像線参照）の上に置いた状態でフランジ部７と発熱体３の二点で支持され雄ネジ部５が浮く。よって落下等の衝撃の大部分がフランジ部７に加わるため、雄ネジ部５のネジ山が破損するリスクが低下する。
また、主体金具２にフランジ部７を設けたことにより、グロープラグ１の重心がフランジ部７寄りのポイントに設定されるため、誤って落下させた場合にフランジ部７側に傾いた姿勢で床面等に衝突する確率が高くなる。よって落下等の衝撃で発熱体３が損傷するリスクも低下する。 [Metal fitting-Flange]
The flange portion 7 has the same diameter as the outer diameter of the male screw portion 5 and is formed to have the same size as a concentric circle or to the outside of the circle. For example, when the flange portion 7 is hexagonal, The square inscribed circle is set to be equal to or larger than the outer diameter of the male screw portion 5.
Therefore, the thickest part in the glow plug 1 is the flange portion 7. Therefore, the flange portion 7 and the heating element 3 are placed with the glow plug 1 placed on the flat horizontal base 8 (see the imaginary line in FIG. 2). The male screw part 5 floats supported at two points. Therefore, most of the impact such as dropping is applied to the flange portion 7, so that the risk of breakage of the thread of the male screw portion 5 is reduced.
In addition, since the center of gravity of the glow plug 1 is set at a point near the flange 7 by providing the flange 7 on the metal shell 2, the floor is inclined to the flange 7 when it is accidentally dropped. The probability of colliding with a surface or the like increases. Therefore, the risk that the heating element 3 is damaged by an impact such as dropping is also reduced.

以上のように構成されるグロープラグ１は、エンジン（図示せず）側のプラグ取付孔に発熱体３側から差込み、該プラグ取付孔に形成されたプラグ取付用雌ネジ部に主体金具２の前記雄ネジ部５を螺合させ、さらに主体金具２の前記工具係合部６に工具を嵌めて回転させることによりプラグ取付用雌ネジ部に前記雄ネジ部５を締め付けて固定し、或は逆回しして取り外す。
なお、もし工具係合部６が破損して工具による回転が不能になった場合は、フランジ部７を工具係合部６の代用品として使用することができる。 The glow plug 1 configured as described above is inserted into the plug mounting hole on the engine (not shown) side from the heating element 3 side, and the metal shell 2 is attached to the female thread portion for plug mounting formed in the plug mounting hole. The male screw portion 5 is screwed, and the male screw portion 5 is fastened and fixed to the female screw portion for plug attachment by further fitting and rotating a tool in the tool engaging portion 6 of the metal shell 2, or Remove it by turning it backwards.
If the tool engaging portion 6 is damaged and cannot be rotated by the tool, the flange portion 7 can be used as a substitute for the tool engaging portion 6.

上記グロープラグ１は、Ｍ１０ネジの雄ネジ部５（外径約＝１０ｍｍ）に対して、工具係合部６をＪＩＳに規定されるＨｅｘ８の六角ボルト（二面幅約８ｍｍ）の頭部相当形状の六角形とし、その工具係合部６と前記雄ネジ部５との間にＪＩＳに規定されるＨｅｘ１０の六角ボルト（二面幅約１０ｍｍ）の頭部相当形状の六角形（但し、各角部を丸く削ったほぼ六角形）であるフランジ部７を形成して構成することができる。   The glow plug 1 corresponds to the head of a Hex 8 hexagon bolt (two-sided width of about 8 mm) as defined in JIS with respect to the male threaded portion 5 (outer diameter: about 10 mm) of an M10 screw. Hexagonal shape, Hex10 hexagonal bolt (width across flats of about 10 mm) defined in JIS between the tool engaging portion 6 and the male threaded portion 5 is a hexagonal shape corresponding to the head (however, each It can be formed by forming a flange portion 7 having a substantially hexagonal shape with rounded corners.

以上、本発明を実施形態及び実施例について説明したが、もちろん本発明は上記実施形態及び実施例に限定されるものではない。例えば実施形態では、フランジ部７の形状を六角形にしたが、これを単純な円形にしてもよい。この場合のフランジ部７の直径は、雄ネジ部５の外径以上であればよい。また、それ以外にもフランジ部７は、三角形、四角形、八角形、その他の多角形や、楕円形、長円形などにしてもよい。
また、図１、図２のグロープラグ１は、形態上の特徴から工具係合部６とフランジ部７が鍛造により形成されていることを示しているが、言うまでもなく工具係合部６とフランジ部７は、切削で形成してもよい。なお、その場合のグロープラグ１の形態を図４に示す。 As mentioned above, although this invention was demonstrated about embodiment and an Example, of course, this invention is not limited to the said embodiment and Example. For example, in the embodiment, the shape of the flange portion 7 is a hexagon, but it may be a simple circle. The diameter of the flange part 7 in this case should just be more than the outer diameter of the external thread part 5. FIG. In addition, the flange portion 7 may be a triangle, a quadrangle, an octagon, another polygon, an ellipse, an oval, or the like.
Moreover, although the glow plug 1 of FIG. 1, FIG. 2 has shown that the tool engaging part 6 and the flange part 7 are formed by the forge from the characteristic on a form, Needless to say, the tool engaging part 6 and a flange are shown. The part 7 may be formed by cutting. In addition, the form of the glow plug 1 in that case is shown in FIG.

１ …グロープラグ
２ …主体金具
３ …発熱体
４ …雄ネジ部
６ …工具係合部
７ …フランジ部 DESCRIPTION OF SYMBOLS 1 ... Glow plug 2 ... Main metal fitting 3 ... Heat generating body 4 ... Male screw part 6 ... Tool engaging part 7 ... Flange part

Claims (4)

筒状をなし外周面にエンジン側のプラグ取付用雌ネジ部に螺合する雄ネジ部が形成され、後端に多角形状の工具係合部を有する主体金具と、
該主体金具の中から先端側の外部に突出する発熱体と、を有するグロープラグであって、
前記工具係合部は、前記雄ネジ部の外径と同径で同心の円より内側に入る大きさに形成され、
さらに該工具係合部と前記雄ネジ部との間に、前記円と同一か又はそれより外側にでる大きさのフランジ部が形成されていることを特徴とするグロープラグ。 A male threaded portion that has a cylindrical shape and is formed with a male threaded portion that is screwed into a female threaded portion for plug attachment on the engine side on the outer peripheral surface, and a metal shell having a polygonal tool engaging portion at the rear end;
A glow plug having a heating element protruding outward from the front end side of the metal shell,
The tool engaging portion is formed in a size that enters the inside of a concentric circle with the same diameter as the outer diameter of the male screw portion,
Furthermore, a glow plug having a size that is the same as or larger than the circle is formed between the tool engaging portion and the male screw portion. 前記フランジ部は、非円形であることを特徴とする請求項１記載のグロープラグ。   The glow plug according to claim 1, wherein the flange portion is non-circular. 前記フランジ部は、多角形状で工具により回転させ得るものであることを特徴とする請求項２記載のグロープラグ。   The glow plug according to claim 2, wherein the flange portion has a polygonal shape and can be rotated by a tool. 前記工具係合部は、Ｈｅｘ８の六角ボルトの頭部相当形状であり、
前記雄ネジ部は、Ｍ１０ネジであり、
前記フランジ部は、Ｈｅｘ１０の六角ボルトの頭部相当形状であることを特徴とする請求項３記載のグロープラグ。 The tool engaging portion has a Hex8 hexagonal bolt head equivalent shape,
The male screw part is an M10 screw,
The glow plug according to claim 3, wherein the flange portion has a shape equivalent to a head portion of a hexagonal bolt of Hex10.
JP2011012958A 2011-01-25 2011-01-25 Glow plug Active JP5771400B2 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB418611A (en) * 1933-07-18 1934-10-29 Ac Spark Plug Co Improvements relating to glow plugs for use particularly with compression ignition engines
JPH0390243A (en) * 1989-06-21 1991-04-16 Ngk Spark Plug Co Ltd Manufacture of main body fixture
EP0887592A1 (en) * 1997-06-27 1998-12-30 Cooper Industries Italia S.p.A. Monolithic glow plug probe/shell
JP2001182585A (en) * 1999-12-24 2001-07-06 Denso Corp Structure of combustion pressure sensor
JP2012132674A (en) * 2010-12-22 2012-07-12 Hidria Aet Druzba Za Proizvodnjo Vzignih Sistemov In Elektronike Doo Glow plug with load sensing sleeve surrounding heating rod outside of combustion chamber

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB418611A (en) * 1933-07-18 1934-10-29 Ac Spark Plug Co Improvements relating to glow plugs for use particularly with compression ignition engines
JPH0390243A (en) * 1989-06-21 1991-04-16 Ngk Spark Plug Co Ltd Manufacture of main body fixture
EP0887592A1 (en) * 1997-06-27 1998-12-30 Cooper Industries Italia S.p.A. Monolithic glow plug probe/shell
JP2001182585A (en) * 1999-12-24 2001-07-06 Denso Corp Structure of combustion pressure sensor
JP2012132674A (en) * 2010-12-22 2012-07-12 Hidria Aet Druzba Za Proizvodnjo Vzignih Sistemov In Elektronike Doo Glow plug with load sensing sleeve surrounding heating rod outside of combustion chamber

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