JP4268596B2 - Glow plug with combustion pressure detection mechanism and glow plug connection structure - Google Patents

Glow plug with combustion pressure detection mechanism and glow plug connection structure Download PDF

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JP4268596B2
JP4268596B2 JP2005102457A JP2005102457A JP4268596B2 JP 4268596 B2 JP4268596 B2 JP 4268596B2 JP 2005102457 A JP2005102457 A JP 2005102457A JP 2005102457 A JP2005102457 A JP 2005102457A JP 4268596 B2 JP4268596 B2 JP 4268596B2
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connector
sensor
terminal
glow plug
terminal portion
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JP2006284055A (en
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啓治 尾関
浩二 岡崎
正好 松井
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NGK Spark Plug Co Ltd
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Description

本発明は、ディーゼルエンジン等の内燃機関の始動補助装置として使用すると共に、内燃機関の燃焼圧の変化を検知できる燃焼圧検知機能付きグロープラグ、及び、このような燃焼圧検知機能付きグロープラグにコネクタを装着したグロープラグ接続構造体に関する。   INDUSTRIAL APPLICABILITY The present invention is a glow plug with a combustion pressure detection function that can be used as a start assist device for an internal combustion engine such as a diesel engine and can detect a change in the combustion pressure of the internal combustion engine, and such a glow plug with a combustion pressure detection function. The present invention relates to a glow plug connection structure equipped with a connector.

従来より、内燃機関の始動補助を行うためのグロープラグに、燃焼圧検知機能を付加した燃焼圧検知機能付きグロープラグが知られている。例えば特許文献１や特許文献２の発明の実施の形態等に、このような燃焼圧検知機能付きグロープラグが開示されている。   2. Description of the Related Art Conventionally, a glow plug with a combustion pressure detection function in which a combustion pressure detection function is added to a glow plug for assisting in starting an internal combustion engine is known. For example, such a glow plug with a combustion pressure detection function is disclosed in the embodiments of the inventions of Patent Document 1 and Patent Document 2.

特許文献１の発明の実施の形態等に開示された燃焼圧検知機能付きグロープラグは、筒状のハウジングと、その軸線方向先端側に挿通され、通電により昇温するヒータ部材と、ハウジングに挿通され、使用時における内燃機関の燃焼圧の変化に伴って、ハウジングに対して軸線方向に相対変位を生じる中軸と、この相対変位に基づいて燃焼圧の変化を検知するセンサ部（圧電素子や取出回路などから構成された部分）とを備える。そして、この燃焼圧検知機能付きグロープラグでは、センサ部で発生したセンサ出力信号を外部へ取り出すために、センサ部にケーブルを接続して、このケーブルをプラグ内部から外部へ引き出す形態としている。   The glow plug with a combustion pressure detecting function disclosed in the embodiment of the invention of Patent Document 1 is inserted into a cylindrical housing, a heater member that is inserted into the tip end side in the axial direction and heated by energization, and the housing. In response to a change in the combustion pressure of the internal combustion engine in use, a central shaft that produces a relative displacement in the axial direction with respect to the housing, and a sensor unit that detects a change in the combustion pressure based on this relative displacement (piezoelectric element or take-out) A portion composed of a circuit or the like). And in this glow plug with a combustion pressure detection function, in order to take out the sensor output signal generated in the sensor part to the outside, a cable is connected to the sensor part, and this cable is pulled out from the inside of the plug to the outside.

また、特許文献２の第１実施形態にも、上記の燃焼圧検知機能付きグロープラグと概略同様な形態の燃焼圧検知機能付きグロープラグが開示されている。更に、特許文献２の第２実施形態では、上記のようなケーブルを無くしてセンサ出力信号を外部へ取り出す形態の燃焼圧検知機能付きグロープラグが開示されている。即ち、この燃焼圧検知機能付きグロープラグは、ケーブルの代わりに、センサ部の径方向外側の所定位置に、斜め基端側に突出するコネクタ部を設け、このコネクタ部を介して外部との接続を行っている。   Also, the first embodiment of Patent Document 2 discloses a glow plug with a combustion pressure detection function that is substantially similar to the above-described glow plug with a combustion pressure detection function. Furthermore, in the second embodiment of Patent Document 2, a glow plug with a combustion pressure detection function is disclosed in which a sensor output signal is extracted outside without the cable as described above. That is, this glow plug with a combustion pressure detection function is provided with a connector portion protruding obliquely at the base end side at a predetermined position on the radially outer side of the sensor portion instead of a cable, and is connected to the outside via this connector portion. It is carried out.

特開２００４−２７８９３２号公報JP 2004-278932 A 特開２００１−２４１３７２号公報JP 2001-241372 A

特許文献１や特許文献２の第１実施形態に開示された燃焼圧検知機能付きグロープラグでは、上記のようなケーブルが存在するために、燃焼圧検知機能付きグロープラグを内燃機関に取り付ける際、ケーブルが取付用工具等と干渉して、その取付が困難であったり、ケーブルに断線等の不具合が生じるおそれがあった。特に、近年のディーゼルエンジン等に用いられる燃焼圧検知機能付きグロープラグは、小型化、省スペース化に伴い、その取付環境が過酷化しているため、このような問題が生じやすい傾向にある。また、上記のようなケーブルを利用した燃焼圧検知機能付きグロープラグは、組み付け工数が多くなるなど、製造上の問題も抱えていた。更に、ケーブル不良が生じた場合には、燃焼圧検知機能付きグロープラグごと交換しなければならないという問題もあった。   In the glow plug with combustion pressure detection function disclosed in the first embodiment of Patent Document 1 and Patent Document 2, since the cable as described above exists, when attaching the glow plug with combustion pressure detection function to the internal combustion engine, There is a possibility that the cable interferes with an installation tool or the like, and that the installation is difficult, or that the cable has a problem such as disconnection. In particular, glow plugs with a combustion pressure detection function used in recent diesel engines and the like tend to be prone to such problems because their mounting environment has become severe with downsizing and space saving. Further, the glow plug with a combustion pressure detecting function using the cable as described above has problems in manufacturing such as an increase in the number of assembly steps. Further, when a cable failure occurs, there is a problem that the glow plug with a combustion pressure detection function must be replaced.

これに対し、特許文献２の第２実施形態に開示された燃焼圧検知機能付きグロープラグは、上記のようなケーブルが存在しないため、プラグ取付時にケーブルが邪魔になって生じる不具合は発生しない。また、ケーブルを無くすことで、組み付け工数の低減を図ることもできる。しかしながら、この燃焼圧検知機能付きグロープラグでは、センサ部がプラグの軸線方向中間部付近に配置され、ケーブルの代わりに設けられたコネクタ部が、センサ部の径方向外側から斜め基端側に向かって突出しているため、コネクタをコネクタ部に装着し難い。   On the other hand, the glow plug with a combustion pressure detection function disclosed in the second embodiment of Patent Document 2 does not have the cable as described above, and therefore does not cause a problem that occurs when the plug is attached to obstruct the cable. Further, the number of assembling steps can be reduced by eliminating the cable. However, in this glow plug with a combustion pressure detection function, the sensor portion is disposed near the middle portion in the axial direction of the plug, and the connector portion provided instead of the cable extends from the radially outer side of the sensor portion toward the oblique base end side. Therefore, it is difficult to attach the connector to the connector part.

更に、コネクタ部がセンサ部の径方向外側から斜め基端側に向かって突出しているため、使用時にコネクタ部に装着したコネクタが振動すると、この振動がセンサ出力信号に影響を及ぼすことがある。具体的には、この第２実施形態の燃焼圧検知機能付きグロープラグでは、その軸線方向に沿った方向に内燃機関の振動が加わっても、コネクタ部やこれに装着するコネクタには、これとは異なる独自の振動が生じる。コネクタ部やこれに装着するコネクタは、上記の振動方向に対して斜めに配設されているからである。その結果、センサ出力信号には、内燃機関の振動にコネクタ部やコネクタの振動が加わったものが現れる。つまり、センサ出力信号が歪む。また、軸線方向の振動により、コネクタ部とコネクタとの接続が断続して、センサ出力信号にノイズが生じるおそれもある。このため、内燃機関の燃焼圧を正確に検知することが困難となるおそれがあった。   Furthermore, since the connector portion protrudes from the radially outer side of the sensor portion toward the oblique base end side, if the connector attached to the connector portion vibrates during use, this vibration may affect the sensor output signal. Specifically, in the glow plug with a combustion pressure detecting function of the second embodiment, even if the vibration of the internal combustion engine is applied in the direction along the axial direction, Produces different and unique vibrations. This is because the connector portion and the connector attached to the connector portion are disposed obliquely with respect to the vibration direction. As a result, the sensor output signal appears that is the vibration of the internal combustion engine plus the vibration of the connector portion or the connector. That is, the sensor output signal is distorted. In addition, vibrations in the axial direction may cause the connection between the connector portion and the connector to be interrupted, resulting in noise in the sensor output signal. For this reason, it may be difficult to accurately detect the combustion pressure of the internal combustion engine.

本発明は、かかる現状に鑑みてなされたものであって、センサ出力信号をケーブルに代えてコネクタを用いて取り出す形態において、コネクタを容易に装着できる燃焼圧検知機能付きグロープラグ、及び、このような燃焼圧検知機能付きグロープラグにコネクタが装着したグロープラグ接続構造体を提供することを目的とする。   The present invention has been made in view of such a situation, and in a form in which a sensor output signal is taken out by using a connector instead of a cable, a glow plug with a combustion pressure detecting function capable of easily mounting the connector, and such An object of the present invention is to provide a glow plug connection structure in which a connector is attached to a glow plug with a combustion pressure detection function.

その解決手段は、筒状のハウジングと、前記ハウジングに自身の軸線方向基端側が挿通されてなり、第１ヒータ端子部及び第２ヒータ端子部を有し、これら第１ヒータ端子部と第２ヒータ端子部との間に通電することにより昇温するヒータ部材と、前記ハウジングに挿通されてなり、自身の軸線方向基端側に中軸端子部を有し、前記ヒータ部材の前記第１ヒータ端子部と電気的に接続する中軸と、センサ出力信号を取り出す第１センサ端子部及び第２センサ端子部を有し、内燃機関の燃焼圧の変化を検知するセンサ部と、を備える燃焼圧検知機能付きグロープラグであって、前記中軸端子部は、軸線方向基端側から軸線方向に沿って装着する第１コネクタに配設された第１コネクタ端子部と電気的に接続可能な形態とされてなる中軸端子接続部を有し、前記中軸端子接続部は、前記第１コネクタ端子部と軸線周りのいずれの方位についてでも圧接可能な形態とされてなり、前記第１センサ端子部は、軸線方向基端側から軸線方向に沿って装着し、前記第１コネクタと一体とされてなる第２コネクタに配設された第２コネクタ端子部と電気的に接続可能な形態とされてなるセンサ端子接続部を有し、前記センサ端子接続部は、前記第２コネクタ端子部と軸線周りのいずれの方位についてでも圧接可能な形態とされてなる燃焼圧検知機能付きグロープラグである。 The solution means includes a cylindrical housing, and a base end side in the axial direction of the housing is inserted into the housing, and has a first heater terminal portion and a second heater terminal portion. A heater member that rises in temperature when energized between the heater terminal portion and the housing is inserted into the housing, and has a middle shaft terminal portion on the proximal end side in the axial direction of the heater member, and the first heater terminal of the heater member center pole and, have a first sensor terminal portions and the second sensor terminal portions to take out the sensor output signal, the combustion pressure detecting function comprising: a sensor unit, a detecting a change in combustion pressure in an internal combustion engine which parts and electrically connected A glow plug with a plug, wherein the middle shaft terminal portion is configured to be electrically connectable with a first connector terminal portion disposed on a first connector mounted along the axial direction from the axial base end side. Middle shaft terminal connection Has, the middle axle pin connections, either will be a even pressure possible form for orientation around the first connector terminal portion and the axis, wherein the first sensor terminal portion, the axis from the axial direction base end side along the direction attached, it has a second connector terminal portion and the sensor terminal connection portion formed by an electrically connectable form disposed in the first connector and the second connector formed by integrally, The sensor terminal connecting portion is a glow plug with a combustion pressure detecting function configured to be able to press contact with the second connector terminal portion in any direction around the axis .

本発明によれば、中軸端子部が、軸線方向基端側から装着する第１コネクタに配設された第１コネクタ端子部と電気的に接続可能な形態とされてなる中軸端子接続部を有するため、第１コネクタを軸線方向基端側から装着して、その第１コネクタ端子部を中軸端子部の中軸端子接続部に電気的に接続できる。また、第１センサ端子部が、軸線方向基端側から装着する第２コネクタに配設された第２コネクタ端子部と電気的に接続可能な形態とされてなるセンサ端子接続部を有するため、第２コネクタを軸線方向基端側から装着して、その第２コネクタ端子部を第１センサ端子部のセンサ端子接続部に電気的に接続できる。このため、従来においてセンサ出力信号を外部へ導くために利用していたケーブルを無くすことができる。また、第１，第２コネクタを軸線方向基端側から装着できるので、これらのコネクタの装着が容易にできる。   According to the present invention, the middle shaft terminal portion has the middle shaft terminal connection portion configured to be electrically connected to the first connector terminal portion disposed on the first connector mounted from the axial base end side. Therefore, the first connector can be mounted from the axial base end side, and the first connector terminal portion can be electrically connected to the middle shaft terminal connection portion of the middle shaft terminal portion. In addition, since the first sensor terminal portion has a sensor terminal connection portion configured to be electrically connected to the second connector terminal portion disposed on the second connector attached from the axial base end side, The second connector can be mounted from the axial base end side, and the second connector terminal portion can be electrically connected to the sensor terminal connection portion of the first sensor terminal portion. For this reason, it is possible to eliminate a cable that has been conventionally used to guide the sensor output signal to the outside. Further, since the first and second connectors can be mounted from the axial base end side, it is possible to easily mount these connectors.

加えて、前述したように、従来の燃焼圧検知機能付きグロープラグでは、コネクタ部がセンサ部の径方向外側から斜め基端側に向かって突出しているため、センサ出力信号には、内燃機関による軸線方向の振動に、これとは異なるコネクタ部やコネクタの独自の振動が加わったものが現れ、センサ出力信号が歪むおそれがあった。これに対し、本発明では、第１，第２コネクタが軸線方向基端側から軸線方向に沿って装着される形態であるため、使用時には内燃機関の振動に同調して第１，第２コネクタも軸線方向に振動する。このため、センサ出力信号に歪みが生じにくく、内燃機関の燃焼圧をより正確に検知できる。
更に、本発明によれば、中軸端子接続部が、第１コネクタ端子部と軸線周りのいずれの方位についてでも圧接可能な形態とされている。このため、第１コネクタを燃焼圧検知機能付きグロープラグに装着する際に、第１コネクタを径方向に関していずれの向きに取り付けても、中軸端子接続部と第１コネクタ端子部とを接続できる。また、センサ端子接続部は、第２コネクタ端子部と軸線周りのいずれの方位についてでも圧接可能な形態とされている。このため、第２コネクタを燃焼圧検知機能付きグロープラグに装着する際に、第２コネクタを径方向に関していずれの方向に取り付けても、センサ端子接続部と第２コネクタ端子部とを接続できる。このように本発明の燃焼圧検知機能付きグロープラグでは、第１，第２コネクタの径方向における取付方向性を無くすことができるので、第１，第２コネクタの装着をより容易に行うことができる。
更に、本発明によれば、第１コネクタと第２コネクタとが一体とされている。このため、一度にコネクタを装着できるため、第１，第２コネクタが別体とされた場合よりも装着が容易である。また、第１，第２コネクタを一体とすることで、コネクタを安価にすることができる。 In addition, as described above, in the conventional glow plug with the combustion pressure detection function, the connector portion protrudes from the radially outer side of the sensor portion toward the oblique base end side, and therefore the sensor output signal is determined by the internal combustion engine. There is a risk that the sensor output signal may be distorted due to the vibration in the axial direction and the unique vibration of the connector portion or the connector different from this. On the other hand, in the present invention, the first and second connectors are mounted along the axial direction from the base end side in the axial direction, so that the first and second connectors are synchronized with the vibration of the internal combustion engine when used. Also vibrate in the axial direction. For this reason, the sensor output signal is hardly distorted, and the combustion pressure of the internal combustion engine can be detected more accurately .
Furthermore, according to the present invention, the middle shaft terminal connecting portion is configured to be able to press contact with the first connector terminal portion in any direction around the axis. For this reason, when attaching the first connector to the glow plug with a combustion pressure detecting function, the middle shaft terminal connecting portion and the first connector terminal portion can be connected regardless of the orientation of the first connector in the radial direction. Further, the sensor terminal connecting portion is configured to be able to press contact with the second connector terminal portion in any direction around the axis. For this reason, when attaching the second connector to the glow plug with a combustion pressure detecting function, the sensor terminal connecting portion and the second connector terminal portion can be connected regardless of the radial direction of the second connector. As described above, in the glow plug with the combustion pressure detecting function of the present invention, the mounting directionality in the radial direction of the first and second connectors can be eliminated, so that the first and second connectors can be attached more easily. it can.
Furthermore, according to the present invention, the first connector and the second connector are integrated. For this reason, since a connector can be attached at once, the attachment is easier than when the first and second connectors are separated. Further, by integrating the first and second connectors, the connector can be made inexpensive.

更に、上記の燃焼圧検知機能付きグロープラグであって、前記中軸端子接続部は、前記第１コネクタ端子部と軸線に直交する平面に沿う方向に圧接可能な形態とされてなり、前記センサ端子接続部は、前記第２コネクタ端子部と軸線に直交する平面に沿う方向に圧接可能な形態とされてなる燃焼圧検知機能付きグロープラグとすると良い。   Furthermore, in the above glow plug with a combustion pressure detecting function, the middle shaft terminal connecting portion is configured to be pressure-contactable with the first connector terminal portion in a direction along a plane perpendicular to the axis. The connecting portion may be a glow plug with a combustion pressure detecting function that can be pressed in a direction along a plane orthogonal to the second connector terminal portion and the axis.

前述したように、使用時にコネクタが振動すると、この振動により燃焼圧検知機能付きグロープラグとコネクタとの接続が断続して、センサ出力信号にノイズが生じるおそれがある。これに対し、本発明では、中軸端子接続部は、第１コネクタ端子部と軸線に直交する平面に沿う方向に圧接可能な形態とされている。このため、使用時に、軸線方向の振動により中軸接続端子部と第１コネクタ端子部とが軸線方向に相対的に移動しても、中軸接続端子部と第１コネクタ端子部とが圧接した状態を確実に維持できる。   As described above, when the connector vibrates during use, the vibration may disconnect the glow plug with the combustion pressure detecting function and the connector, and noise may be generated in the sensor output signal. On the other hand, in the present invention, the middle shaft terminal connecting portion is configured to be press-contactable in a direction along a plane perpendicular to the first connector terminal portion and the axis. Therefore, during use, even if the middle shaft connection terminal portion and the first connector terminal portion move relatively in the axial direction due to vibration in the axial direction, the state where the middle shaft connection terminal portion and the first connector terminal portion are in pressure contact with each other Can be reliably maintained.

また、センサ端子接続部は、第２コネクタ端子部と軸線に直交する平面に沿う方向に圧接可能な形態とされている。このため、使用時に、軸線方向の振動によりセンサ端子接続部と第２コネクタ端子部とが軸線方向に相対的に移動しても、センサ接続端子部と第２コネクタ端子部とが圧接した状態を確実に維持できる。従って、使用時にセンサ接続端子部と第２コネクタ端子部との接続が断続してセンサ出力信号にノイズが生じることを抑制でき、より正確に内燃機関の燃焼圧を検知できる。   Further, the sensor terminal connecting portion is configured to be capable of being pressed into contact with the second connector terminal portion in a direction along a plane orthogonal to the axis. For this reason, even when the sensor terminal connecting portion and the second connector terminal portion move relatively in the axial direction due to vibration in the axial direction, the sensor connecting terminal portion and the second connector terminal portion are in pressure contact with each other. Can be reliably maintained. Therefore, it is possible to suppress the occurrence of noise in the sensor output signal due to intermittent connection between the sensor connection terminal portion and the second connector terminal portion during use, and the combustion pressure of the internal combustion engine can be detected more accurately.

更に、上記のいずれかに記載の燃焼圧検知機能付きグロープラグであって、前記中軸端子接続部及び前記センサ端子接続部は、径方向に見て、それぞれ前記ハウジングの基端外周よりも内側に配置されてなる燃焼圧検知機能付きグロープラグとすると良い。   Furthermore, the glow plug with a combustion pressure detection function according to any one of the above, wherein the center shaft terminal connection portion and the sensor terminal connection portion are respectively located on the inner side of the outer periphery of the base end of the housing when viewed in the radial direction. It is preferable to use a glow plug with a combustion pressure detection function.

本発明によれば、中軸端子接続部及びセンサ端子接続部が、径方向に見てハウジングの基端外周よりも内側に配置されている。このため、中軸端子接続部と第１コネクタ端子部との接続、及び、センサ端子接続部と第２コネクタ端子部との接続を、径方向のより中心近傍で行うこととなる。従って、燃焼圧検知機能付きグロープラグの基端側部分における径方向の寸法や、第１，第２コネクタの径方向の寸法を小さくできる。   According to the present invention, the central shaft terminal connection portion and the sensor terminal connection portion are disposed on the inner side of the outer periphery of the proximal end of the housing as viewed in the radial direction. For this reason, the connection between the central shaft terminal connection portion and the first connector terminal portion and the connection between the sensor terminal connection portion and the second connector terminal portion are performed nearer to the center in the radial direction. Accordingly, it is possible to reduce the radial dimension at the base end side portion of the glow plug with the combustion pressure detecting function and the radial dimension of the first and second connectors.

更に、上記のいずれかに記載の燃焼圧検知機能付きグロープラグであって、前記第２ヒータ端子部及び前記第２センサ端子部は、いずれも前記ハウジングに電気的に接続してなる燃焼圧検知機能付きグロープラグとすると良い。   Furthermore, the glow plug with a combustion pressure detecting function according to any one of the above, wherein the second heater terminal portion and the second sensor terminal portion are both electrically connected to the housing. A glow plug with function is recommended.

本発明によれば、第２ヒータ端子部も第２センサ端子部もハウジングに電気的に接続している。このため、この燃焼圧検知機能付きグロープラグを内燃機関に取り付けたときには、ハウジングを通じて、第２ヒータ端子部も第２センサ端子部も内燃機関に電気的に接続させる、即ち、内燃機関に接地させることができる。これにより、燃焼圧検知機能付きグロープラグのヒータ部材を昇温させるには、中軸端子接続部（中軸）を通じて、第１ヒータ端子部からヒータに電流を流せばよく、第２ヒータ端子部から出た電流は、ハウジングを通じて接地されるので、電流の帰路を別途設ける必要がない。また、内燃機関の燃焼圧を検知する際にも、例えば検出素子が圧電素子の場合、センサ部の第２センサ端子部に集まった電荷は、ハウジングを通じて接地されるので、センサ部の第１センサ端子部と内燃機関やこれに導通する車体等との間で電荷を測定すれば足りる。このため、センサ部の第２センサ端子部に集まった電荷を計測するための経路を別途設ける必要がない。よって、燃焼圧検知機能付きグロープラグを単純な構造とすることができる。   According to the present invention, both the second heater terminal portion and the second sensor terminal portion are electrically connected to the housing. For this reason, when the glow plug with the combustion pressure detection function is attached to the internal combustion engine, the second heater terminal portion and the second sensor terminal portion are electrically connected to the internal combustion engine through the housing, that is, grounded to the internal combustion engine. be able to. Thus, in order to raise the temperature of the heater member of the glow plug with the combustion pressure detection function, it is only necessary to pass a current from the first heater terminal portion to the heater through the center shaft terminal connection portion (center shaft), and the temperature is output from the second heater terminal portion. Since the current is grounded through the housing, there is no need to provide a separate current return path. Further, when detecting the combustion pressure of the internal combustion engine, for example, when the detection element is a piezoelectric element, the electric charge collected at the second sensor terminal portion of the sensor portion is grounded through the housing. It is sufficient to measure the electric charge between the terminal portion and the internal combustion engine or the vehicle body connected to the internal combustion engine. For this reason, it is not necessary to separately provide a path for measuring charges collected at the second sensor terminal portion of the sensor portion. Therefore, the glow plug with a combustion pressure detection function can be made into a simple structure.

また、他の解決手段は、燃焼圧検知機能付きグロープラグにコネクタが装着されたグロープラグ接続構造体であって、筒状のハウジング、前記ハウジングに自身の軸線方向基端側が挿通されてなり、第１ヒータ端子部及び第２ヒータ端子部を有し、これら第１ヒータ端子部と第２ヒータ端子部との間に通電することにより昇温するヒータ部材、前記ハウジングに挿通されてなり、自身の軸線方向基端側に中軸端子部を有し、前記ヒータ部材の前記第１ヒータ端子部と電気的に接続する中軸であって、前記中軸端子部が、外部に露出する中軸端子接続部を有する中軸、並びに、センサ出力信号を取り出す第１センサ端子部及び第２センサ端子部を有し、内燃機関の燃焼圧の変化を検知するセンサ部であって、前記第１センサ端子部が、外部に露出するセンサ端子接続部を有するセンサ部、を備える燃焼圧検知機能付きグロープラグと、前記燃焼圧検知機能付きグロープラグの軸線方向基端側から軸線方向に沿って装着された第１コネクタであって、前記中軸端子接続部と電気的に接続した第１コネクタ端子部を有する第１コネクタと、前記燃焼圧検知機能付きグロープラグの軸線方向基端側から軸線方向に沿って装着され、前記第１コネクタと一体とされてなる第２コネクタであって、前記センサ端子接続部と電気的に接続した第２コネクタ端子部を有する第２コネクタと、を備え、前記中軸端子接続部と前記第１コネクタ端子部とは、軸線周りのいずれの方位についてでも互いに圧接可能な状態で、互いに圧接してなり、前記センサ端子接続部と前記第２コネクタ端子部とは、軸軸線周りのいずれの方位についてでも互いに圧接可能な状態で、互いに圧接してなるグロープラグ接続構造体である。 Another solution is a glow plug connection structure in which a connector is attached to a glow plug with a combustion pressure detection function, and a cylindrical housing, the axial base end side of which is inserted into the housing, A heater member that has a first heater terminal portion and a second heater terminal portion, and that is heated by energizing between the first heater terminal portion and the second heater terminal portion, is inserted into the housing, and is itself A middle shaft terminal portion on the proximal end side in the axial direction of the heater member, and a middle shaft electrically connected to the first heater terminal portion of the heater member, wherein the middle shaft terminal connection portion is exposed to the outside. middle axle having, as well, have a first sensor terminal portions and the second sensor terminal portions to take out the sensor output signal, a sensor unit for detecting a change in the combustion pressure of the internal combustion engine, wherein the first sensor terminal portion, an external Dew A glow plug with a combustion pressure detecting function, and a first connector mounted along the axial direction from the axial base end side of the glow plug with a combustion pressure detecting function. A first connector having a first connector terminal portion electrically connected to the middle shaft terminal connection portion, and mounted along the axial direction from the axial base end side of the glow plug with combustion pressure detection function , a first connector and the second connector formed by the integral, and the second connector having a second connector terminal section connected the sensor terminal connecting portion and electrically, Bei example, said said middle axle terminal connecting portion first The one connector terminal portion is in a state where it can be in pressure contact with each other in any direction around the axis, and the sensor terminal connection portion and the second connector terminal portion are in the axial axis. In either mutually pressed ready but the orientation around a glow plug connection structure formed by press-contact with each other.

本発明のグロープラグ接続構造体は、第１コネクタが軸線方向基端側から軸線方向に沿って燃焼圧検知機能付きグロープラグに装着され、燃焼圧検知機能付きグロープラグの中軸端子接続部と第１コネクタの第１コネクタ端子部とが電気的に接続されている。また、第２コネクタも軸線方向基端側から軸線方向に沿って燃焼圧検知機能付きグロープラグに装着され、燃焼圧検知機能付きグロープラグのセンサ端子接続部と第２コネクタの第２コネクタ端子部とが電気的に接続されている。このようなグロープラグ接続構造体は、従来においてセンサ出力信号を外部へ導くために利用していたケーブルを無くすことができる。また、第１，第２コネクタを軸線方向基端側から燃焼圧検知機能付きグロープラグに装着すればグロープラグ接続構造体ができるので、グロープラグ接続構造体を容易に構成できる。加えて、第１，第２コネクタを軸線方向基端側に装着してあるので、使用時には内燃機関の振動に同調して第１，第２コネクタも軸線方向に振動する。このため、センサ出力信号に歪みが生じにくく、内燃機関の燃焼圧をより正確に検知できる。
更に、本発明によれば、第１コネクタと第２コネクタとが一体とされている。このため、グロープラグ接続構造体を構成する際、一度にコネクタを装着できるため、第１，第２コネクタが別体とされた場合よりも装着が容易である。また、第１，第２コネクタを一体とすることで、コネクタを安価にすることができる。
更に、本発明によれば、中軸端子接続部と第１コネクタ端子部とが、軸線周りのいずれの方位についてでも互いに圧接可能である。このため、第１コネクタを燃焼圧検知機能付きグロープラグに装着する際に、第１コネクタを径方向に関していずれの向きに取り付けても、中軸端子接続部と第１コネクタ端子部とを接続できる。また、センサ端子接続部と第２コネクタ端子部とが、軸軸線周りのいずれの方位についてでも互いに圧接可能である。このため、第２コネクタを燃焼圧検知機能付きグロープラグに装着する際に、第２コネクタを径方向に関していずれの方向に取り付けても、センサ端子接続部と第２コネクタ端子部とを接続できる。
このように本発明のグロープラグ接続構造体では、第１，第２コネクタの径方向における取付方向性を無くすことができるので、グロープラグ接続構造体をより容易に構成できる。また、第１，第２コネクタ装着後において、第１，第２コネクタが径方向に関して回転しても、中軸端子接続部と第１コネクタ端子部との接続、及び、センサ端子接続部と第２コネクタ端子部との接続が確実に維持される。このため、グロープラグ接続構造体の取り扱いが容易である。 In the glow plug connection structure of the present invention, the first connector is attached to the glow plug with the combustion pressure detection function along the axial direction from the base end side in the axial direction. The 1st connector terminal part of 1 connector is electrically connected. The second connector is also attached to the glow plug with the combustion pressure detection function along the axial direction from the axial base end side, and the sensor terminal connection portion of the glow plug with the combustion pressure detection function and the second connector terminal portion of the second connector And are electrically connected. Such a glow plug connection structure can eliminate a cable that is conventionally used to guide the sensor output signal to the outside. Further, if the first and second connectors are attached to the glow plug with the combustion pressure detecting function from the axial direction base end side, a glow plug connection structure can be formed, so that the glow plug connection structure can be easily configured. In addition, since the first and second connectors are mounted on the proximal side in the axial direction, the first and second connectors also vibrate in the axial direction in synchronization with the vibration of the internal combustion engine when used. For this reason, the sensor output signal is hardly distorted, and the combustion pressure of the internal combustion engine can be detected more accurately.
Furthermore, according to the present invention, the first connector and the second connector are integrated. For this reason, when the glow plug connection structure is constructed, the connector can be attached at a time, so that the attachment is easier than in the case where the first and second connectors are separated. Further, by integrating the first and second connectors, the connector can be made inexpensive.
Further, according to the present invention, the middle shaft terminal connecting portion and the first connector terminal portion can be pressed against each other in any direction around the axis. For this reason, when attaching the first connector to the glow plug with a combustion pressure detecting function, the middle shaft terminal connecting portion and the first connector terminal portion can be connected regardless of the orientation of the first connector in the radial direction. In addition, the sensor terminal connecting portion and the second connector terminal portion can be pressed against each other in any direction around the axial axis. For this reason, when attaching the second connector to the glow plug with a combustion pressure detecting function, the sensor terminal connecting portion and the second connector terminal portion can be connected regardless of the radial direction of the second connector.
As described above, in the glow plug connection structure of the present invention, the mounting directionality in the radial direction of the first and second connectors can be eliminated, so that the glow plug connection structure can be configured more easily. Further, after the first and second connectors are mounted, even if the first and second connectors rotate with respect to the radial direction, the connection between the central shaft terminal connection portion and the first connector terminal portion, and the sensor terminal connection portion and the second The connection with the connector terminal is reliably maintained. For this reason, the handling of the glow plug connection structure is easy.

更に、上記のいずれかに記載のグロープラグ接続構造体であって、前記中軸端子接続部と前記第１コネクタ端子部とは、軸線に直交する平面に沿う方向に圧接してなり、前記センサ端子接続部と前記第２コネクタ端子部とは、軸線に直交する平面に沿う方向に圧接してなるグロープラグ接続構造体とすると良い。   Furthermore, the glow plug connection structure according to any one of the above, wherein the middle shaft terminal connection portion and the first connector terminal portion are in pressure contact with each other in a direction along a plane perpendicular to the axis. The connection portion and the second connector terminal portion may be a glow plug connection structure formed by pressure contact in a direction along a plane orthogonal to the axis.

本発明では、中軸端子接続部と第１コネクタ端子部とは、軸線に直交する平面に沿う方向に圧接している。このため、使用時に、軸線方向の振動により中軸接続端子部と第１コネクタ端子部とが軸線方向に相対的に移動しても、中軸接続端子部と第１コネクタ端子部とが圧接した状態を確実に維持できる。また、センサ端子接続部と第２コネクタ端子部も、軸線に直交する平面に沿う方向に圧接している。このため、使用時に、軸線方向の振動によりセンサ端子接続部と第２コネクタ端子部とが軸線方向に相対的に移動しても、センサ接続端子部と第２コネクタ端子部とが圧接した状態を確実に維持できる。従って、使用時にセンサ接続端子部と第２コネクタ端子部との接続が断続してセンサ出力信号にノイズが生じることを抑制でき、より正確に内燃機関の燃焼圧を検知できる。   In the present invention, the middle shaft terminal connecting portion and the first connector terminal portion are in pressure contact with each other along a plane perpendicular to the axis. Therefore, during use, even if the middle shaft connection terminal portion and the first connector terminal portion move relatively in the axial direction due to vibration in the axial direction, the state where the middle shaft connection terminal portion and the first connector terminal portion are in pressure contact with each other Can be reliably maintained. Further, the sensor terminal connecting portion and the second connector terminal portion are also in pressure contact with each other along a plane perpendicular to the axis. For this reason, even when the sensor terminal connecting portion and the second connector terminal portion move relatively in the axial direction due to vibration in the axial direction, the sensor connecting terminal portion and the second connector terminal portion are in pressure contact with each other. Can be reliably maintained. Therefore, it is possible to suppress the occurrence of noise in the sensor output signal due to intermittent connection between the sensor connection terminal portion and the second connector terminal portion during use, and the combustion pressure of the internal combustion engine can be detected more accurately.

更に、上記のいずれかに記載のグロープラグ接続構造体であって、前記中軸端子接続部及び前記センサ端子接続部は、径方向に見て、それぞれ前記ハウジングの基端外周よりも内側に配置されてなるグロープラグ接続構造体とすると良い。   Furthermore, in the glow plug connection structure according to any one of the above, the center shaft terminal connection portion and the sensor terminal connection portion are respectively disposed inside the outer periphery of the proximal end of the housing when viewed in the radial direction. A glow plug connection structure is preferable.

本発明によれば、中軸端子接続部及びセンサ端子接続部が、径方向に見てハウジングの基端外周よりも内側に配置されている。このため、中軸端子接続部と第１コネクタ端子部との接続、及び、センサ端子接続部と第２コネクタ端子部との接続を、径方向のより中心近傍で行うこととなる。従って、燃焼圧検知機能付きグロープラグの基端側部分における径方向の寸法や、第１，第２コネクタの径方向の寸法を小さくでき、ひいてはグロープラグ接続構造体を小さくできる。   According to the present invention, the central shaft terminal connection portion and the sensor terminal connection portion are disposed on the inner side of the outer periphery of the proximal end of the housing as viewed in the radial direction. For this reason, the connection between the central shaft terminal connection portion and the first connector terminal portion and the connection between the sensor terminal connection portion and the second connector terminal portion are performed nearer to the center in the radial direction. Therefore, the radial dimension of the base end side portion of the glow plug with the combustion pressure detection function and the radial dimension of the first and second connectors can be reduced, and the glow plug connection structure can be reduced.

更に、上記のいずれかに記載のグロープラグ接続構造体であって、前記第２ヒータ端子部及び前記第２センサ端子部は、いずれも前記ハウジングに電気的に接続してなるグロープラグ接続構造体とすると良い。   The glow plug connection structure according to any one of the above, wherein the second heater terminal part and the second sensor terminal part are both electrically connected to the housing. And good.

本発明によれば、第２ヒータ端子部も第２センサ端子部もハウジングに電気的に接続している。このため、使用時には、ハウジングを通じて、第２ヒータ端子部も第２センサ端子部も内燃機関に接地させることができる。これにより、ヒータ部材を昇温させるには、中軸端子接続部（中軸）を通じて、第１ヒータ端子部からヒータに電流を流せばよく、第２ヒータ端子部から出た電流は、ハウジングを通じて接地されるので、電流の帰路を別途設ける必要がない。また、内燃機関の燃焼圧を検知する際にも、例えば検知素子が圧電素子の場合、センサ部の第２センサ端子部に集まった電荷は、ハウジングを通じて接地されるので、センサ部の第１センサ端子部と内燃機関やこれに導通する車体等との間で電荷を測定すれば足りる。このため、センサ部の第２センサ端子部に集まった電荷を計測するための経路を別途設ける必要がない。よって、グロープラグ接続構造体を単純な構造とすることができる。   According to the present invention, both the second heater terminal portion and the second sensor terminal portion are electrically connected to the housing. For this reason, in use, the second heater terminal portion and the second sensor terminal portion can be grounded to the internal combustion engine through the housing. Thus, in order to raise the temperature of the heater member, it is only necessary to pass a current from the first heater terminal portion to the heater through the center shaft terminal connection portion (center shaft), and the current output from the second heater terminal portion is grounded through the housing. Therefore, there is no need to provide a separate current return path. Further, when detecting the combustion pressure of the internal combustion engine, for example, when the detection element is a piezoelectric element, the electric charge collected at the second sensor terminal portion of the sensor portion is grounded through the housing. It is sufficient to measure the electric charge between the terminal portion and the internal combustion engine or the vehicle body connected to the internal combustion engine. For this reason, it is not necessary to separately provide a path for measuring charges collected at the second sensor terminal portion of the sensor portion. Therefore, the glow plug connection structure can have a simple structure.

（参考形態）
以下、本発明の参考形態を、図面を参照しつつ説明する。図１〜図３に本参考形態の燃焼圧検知機能付きグロープラグ１００を示す。また、図４にこの燃焼圧検知機能付きグロープラグ１００にコネクタ２１０を装着したグロープラグ接続構造体２００を示す。なお、図１〜図４において、図中下方が軸線方向先端側（以下、単に先端側とも言う。）、図中上方が軸線方向基端側（以下、単に基端側とも言う。）である。この燃焼圧検知機能付きグロープラグ１００及びグロープラグ接続構造体２００は、内燃機関の始動補助のため通電によってヒータ部材１１０を発熱できる他に、内燃機関の燃焼圧の変化をセンサ部１６０において検知可能に構成されている。 ( Reference form )
Hereinafter, reference embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a glow plug 100 with a combustion pressure detection function of the present embodiment . FIG. 4 shows a glow plug connection structure 200 in which a connector 210 is mounted on the glow plug 100 with a combustion pressure detection function. 1 to 4, the lower side in the drawing is the axial front end side (hereinafter also simply referred to as the front end side), and the upper side in the drawing is the axial direction base end side (hereinafter also simply referred to as the base end side). . The glow plug 100 with a combustion pressure detection function and the glow plug connection structure 200 can detect the change in the combustion pressure of the internal combustion engine by the sensor unit 160 in addition to heating the heater member 110 by energization for assisting the start of the internal combustion engine. It is configured.

図１に示すように、燃焼圧検知機能付きグロープラグ１００は、軸線ＡＸに沿う方向（軸線方向）に延びる筒状のハウジング１２０と、このハウジング１２０内に保持された導電性の棒状の中軸１４０と、この中軸１４０の先端側に配置された棒状のヒータ部材１１０とを有する。また、燃焼圧検知機能付きグロープラグ１００は、その基端側に、使用時における内燃機関の燃焼圧の変化を検知可能に構成されたセンサ部１６０や、センサ部１６０等をハウジング１２０の外側から包囲する包囲部材１９０、包囲部材１９０の基端側に配設された樹脂ハウジング１８５等を有する。   As shown in FIG. 1, a glow plug 100 with a combustion pressure detection function includes a cylindrical housing 120 extending in a direction (axial direction) along an axis AX, and a conductive rod-shaped central shaft 140 held in the housing 120. And a rod-shaped heater member 110 disposed on the front end side of the central shaft 140. Further, the glow plug 100 with a combustion pressure detection function has a sensor unit 160 configured to be able to detect a change in combustion pressure of the internal combustion engine during use, a sensor unit 160, and the like from the outside of the housing 120 on the base end side. The surrounding member 190 includes a resin housing 185 disposed on the base end side of the surrounding member 190, and the like.

このうち、先端側に位置するヒータ部材１１０は、窒化珪素質セラミックから構成されており、先端が略半球状とされた棒状形態をなす。ヒータ部材１１０は、その先端部１１０ｓがハウジング１２０（ヒータ保持部材１２６）から先端側に向けて外部に突出するように配設されている。図２に示すように、先端部１１０ｓの内部には、非金属発熱体からなるヒータ発熱部１１１が設けられている。一方、ヒータ部材１１０の基端側外周面には、ヒータ発熱部１１１の発熱に必要な電力の供給端子である第１ヒータ端子部１１３及び第２ヒータ端子部１１２がそれぞれ所定位置に設けられている。そして、ヒータ発熱部１１１の基端側両端と第１ヒータ端子部１１３及び第２ヒータ端子部１１２とが、ヒータ部材１１０内に埋設されたヒータ導電路１１５，１１４を介してそれぞれ電気的に接続されている。   Among these, the heater member 110 located on the front end side is made of silicon nitride ceramic and has a rod-like shape with the front end being substantially hemispherical. The heater member 110 is disposed such that a front end portion 110s protrudes outward from the housing 120 (heater holding member 126) toward the front end side. As shown in FIG. 2, a heater heating part 111 made of a nonmetallic heating element is provided inside the tip part 110s. On the other hand, a first heater terminal portion 113 and a second heater terminal portion 112 which are power supply terminals necessary for heat generation of the heater heat generating portion 111 are provided at predetermined positions on the outer peripheral surface of the proximal end side of the heater member 110, respectively. Yes. The both ends of the heater heat generating portion 111 on the proximal end side are electrically connected to the first heater terminal portion 113 and the second heater terminal portion 112 through heater conductive paths 115 and 114 embedded in the heater member 110, respectively. Has been.

ハウジング１２０は、図１〜図３に示すように、筒状のハウジング本体１２１と、この先端側に溶接により固定され、上述のヒータ部材１１０を内側に保持する筒状のヒータ保持部材１２６と、ハウジング本体１２１の基端側に溶接により固定され、センサ部１６０等を内側に保持する筒状のセンサキャップ１３１とから構成されている。
このうちハウジング本体１２１には、その軸線方向の中間部分に、この燃焼圧検知機能付きグロープラグ１００を内燃機関の取付孔に取り付けるための雄ネジ部１２２が形成されている（図１参照）。また、ハウジング本体１２１の基端側には、そのネジ止めの際にレンチなどの工具を係合させる六角形状の工具係合部１２３が形成されている（図１及び図３参照）。 As shown in FIGS. 1 to 3, the housing 120 includes a cylindrical housing main body 121, a cylindrical heater holding member 126 that is fixed to the distal end side by welding and holds the above-described heater member 110 inside, A cylindrical sensor cap 131 is fixed to the base end side of the housing main body 121 by welding and holds the sensor unit 160 and the like inside.
Among these, the housing main body 121 is formed with a male screw portion 122 for attaching the glow plug 100 with the combustion pressure detecting function to the mounting hole of the internal combustion engine at an intermediate portion in the axial direction (see FIG. 1). Further, a hexagonal tool engaging portion 123 that engages a tool such as a wrench at the time of screwing is formed on the base end side of the housing main body 121 (see FIGS. 1 and 3).

ヒータ保持部材１２６は、その基端側に、内燃機関の取付孔内において取付孔内に形成されたテーパ面に圧接して、このヒータ保持部材１２６と取付孔との間の気密を保つために、先細のテーパ面からなるシール部１２７が形成されている（図１及び図２参照）。
図２に示すように、ヒータ保持部材１２６の内側にはヒータ部材１１０が圧入され、ヒータ保持部材１２６とヒータ部材１１０の第２ヒータ端子部１１２とが電気的に接続されている。また、ヒータ部材１１０の基端部１１０ｋは、金属からなる筒状の接続リング１１７に圧入されている。更に、この接続リング１１７には、その基端側から中軸１４０（中軸本体１４１）の先端部１４０ｓが挿入されて溶接により固着されている。これにより、ヒータ部材１１０と中軸１４０とは、接続リング１１７を介して機械的に剛に結合されている。また、ヒータ部材１１０の第１ヒータ端子部１１３と中軸１４０とが、接続リング１１７を介して電気的に接続されている。 The heater holding member 126 is in pressure contact with a tapered surface formed in the mounting hole in the mounting hole of the internal combustion engine on the base end side thereof, in order to keep the airtightness between the heater holding member 126 and the mounting hole. A seal portion 127 having a tapered taper surface is formed (see FIGS. 1 and 2).
As shown in FIG. 2, the heater member 110 is press-fitted inside the heater holding member 126, and the heater holding member 126 and the second heater terminal portion 112 of the heater member 110 are electrically connected. Further, the base end portion 110k of the heater member 110 is press-fitted into a cylindrical connection ring 117 made of metal. Further, the distal end portion 140s of the middle shaft 140 (the middle shaft main body 141) is inserted into the connecting ring 117 from the base end side and fixed by welding. Thereby, the heater member 110 and the middle shaft 140 are mechanically rigidly coupled via the connection ring 117. Further, the first heater terminal portion 113 of the heater member 110 and the middle shaft 140 are electrically connected via a connection ring 117.

このような構成とすることで、この燃焼圧検知機能付きグロープラグ１００を内燃機関に取り付けたときには、ハウジング１２０を通じて、第２ヒータ端子部１１２を内燃機関に接地させることができる。これにより、ヒータ部材１１０を昇温させるには、中軸１４０を通じて、ヒータ部材１１０に電流を流せばよく、第２ヒータ端子部１１２から出た電流は、ハウジング１２０を通じて接地されるので、電流の帰路を別途設ける必要がない。よって、燃焼圧検知機能付きグロープラグ１００を単純な構造とすることができる。   With this configuration, when the glow plug 100 with a combustion pressure detection function is attached to the internal combustion engine, the second heater terminal portion 112 can be grounded to the internal combustion engine through the housing 120. Thus, in order to raise the temperature of the heater member 110, it is only necessary to pass a current to the heater member 110 through the middle shaft 140, and the current output from the second heater terminal portion 112 is grounded through the housing 120. Need not be provided separately. Therefore, the glow plug 100 with a combustion pressure detection function can be made into a simple structure.

一方、図３に示すように、センサキャップ１３１は、その内側に保持するセンサ部１６０の中核をなす部分とその外側に配置されるセンサ端子リード部１７４とを接続するために一部（図中左側）が軸線方向に沿って開口した略筒状の形態をなす胴部１３２を有する。また、センサキャップ１３１は、胴部１３２の先端側に位置し、胴部１３２よりも肉薄とされた円環状の環状部１３３と、胴部１３２の基端から軸線方向に直交して径方向内側に突出する内方突出部１３４とを有する。   On the other hand, as shown in FIG. 3, the sensor cap 131 has a part (in the drawing) for connecting a portion forming the core of the sensor portion 160 held inside thereof and a sensor terminal lead portion 174 arranged on the outside thereof. The left side) has a body 132 having a substantially cylindrical shape opened along the axial direction. The sensor cap 131 is positioned on the distal end side of the body portion 132, and has an annular annular portion 133 that is thinner than the body portion 132, and a radially inner side perpendicular to the axial direction from the base end of the body portion 132. And an inward projecting portion 134 projecting from the inside.

次に、中軸１４０について説明する。中軸１４０は、鉄からなり、ハウジング１２０の内側に配置されている。この中軸１４０は、軸線方向に棒状に延びる中軸本体１４１と、図３に示すように、中軸本体１４１の基端側に固定された筒状の中軸スリーブ１５１とを有する。中軸スリーブ１５１は、中軸本体１４１を内側に挿通し、中軸本体１４１の基端において、アーク溶接により固着されている。中軸スリーブ１５１は、センサキャップ１３１の内側に配置され、基端側がセンサキャップ１３１の内方突出部１３４よりも基端側に突出する円筒状の筒状本体１５２を有する。また、中軸スリーブ１５１は、筒状本体１５２の先端から径方向外側に向けて突出するフランジ状の外方突出部１５３も有する。筒状本体１５２の外周は、絶縁チューブ１５４により包囲されている。   Next, the middle shaft 140 will be described. The middle shaft 140 is made of iron and is disposed inside the housing 120. The middle shaft 140 has a middle shaft main body 141 extending in a rod shape in the axial direction, and a cylindrical middle shaft sleeve 151 fixed to the proximal end side of the middle shaft main body 141 as shown in FIG. The middle shaft sleeve 151 is inserted through the middle shaft main body 141 inside, and is fixed to the base end of the middle shaft main body 141 by arc welding. The middle shaft sleeve 151 is disposed inside the sensor cap 131, and has a cylindrical cylindrical main body 152 whose proximal end protrudes more proximally than the inward projecting portion 134 of the sensor cap 131. The intermediate shaft sleeve 151 also includes a flange-shaped outward projecting portion 153 that projects outward from the distal end of the cylindrical main body 152 in the radial direction. The outer periphery of the cylindrical main body 152 is surrounded by an insulating tube 154.

また、中軸１４０は、その基端側に中軸端子部１５５を有する。この中軸端子部１５５は、ハウジング１２０の基端部（センサキャップ１３１）の外周よりも径方向内側に配置されている。この中軸端子部１５５は、略筒状をなし、中軸本体１４１の基端を挿通して中軸本体１４１に固定された中軸端子筒状部１５６と、この中軸端子筒状部１５６から軸線方向に沿って基端側に延び、外部に露出する平板状の中軸端子接続部１５７とを有する。この中軸端子接続部１５７は、後述するコネクタ２１０を基端側から装着したときに、中軸用コネクタ端子部（第１コネクタ端子部）２３２と接触して電気的に接続される（図４参照）。   The middle shaft 140 has a middle shaft terminal portion 155 on the proximal end side. The central shaft terminal portion 155 is disposed radially inward from the outer periphery of the base end portion (sensor cap 131) of the housing 120. The central shaft terminal portion 155 has a substantially cylindrical shape, and passes through the proximal end of the central shaft main body 141 and is fixed to the central shaft main body 141. The central shaft terminal cylindrical portion 156 extends along the axial direction from the central shaft terminal cylindrical portion 156. And a flat-plate-shaped central shaft terminal connecting portion 157 that extends to the base end side and is exposed to the outside. The middle shaft terminal connection portion 157 contacts and is electrically connected to the middle shaft connector terminal portion (first connector terminal portion) 232 when a connector 210 described later is mounted from the proximal end side (see FIG. 4). .

なお、中軸端子接続部１５７を、径方向に見て、ハウジング１２０の基端部（センサキャップ１３１）の外周よりも内側に配置することで、中軸端子接続部１５７と中軸用コネクタ端子部２３２との接続が、径方向のより中心近傍で行われる。このため、燃焼圧検知機能付きグロープラグ１００の基端側部分における径方向の寸法や、後述するコネクタ２１０の径方向の寸法を小さくでき、ひいてはグロープラグ接続構造体２００を小さくできる（図４参照）。   The middle shaft terminal connection portion 157 is disposed inside the outer periphery of the base end portion (sensor cap 131) of the housing 120 when viewed in the radial direction, so that the middle shaft terminal connection portion 157, the middle shaft connector terminal portion 232, Are connected closer to the center in the radial direction. For this reason, the radial dimension of the base end side portion of the glow plug 100 with the combustion pressure detecting function and the radial dimension of the connector 210 to be described later can be reduced, and the glow plug connection structure 200 can be reduced (see FIG. 4). ).

中軸１４０の中軸本体１４１とハウジング１２０のハウジング本体１２１との間に形成された空間のうち、ハウジング本体１２１の基端側の所定位置には、耐熱性を有するフッ素ゴムからなるＯリング１４９が配置されている。また、この空間のうち、Ｏリング１４９の基端側には、自身の内側に中軸本体１４１を内挿する筒状部材１４８が挿入されている。   An O-ring 149 made of heat-resistant fluororubber is disposed at a predetermined position on the base end side of the housing body 121 in a space formed between the middle shaft body 141 of the middle shaft 140 and the housing body 121 of the housing 120. Has been. Further, in this space, a cylindrical member 148 for inserting the central shaft main body 141 is inserted inside the O ring 149 on the proximal end side thereof.

次に、図３を参照しつつ、センサ部１６０及びその近傍の構造について説明する。センサ部１６０は、その中核をなす部分が、ハウジング本体１２１の基端部１２１ｋ側において、センサキャップ１３１の内側に配設されている。センサ部１６０は、押圧金具（第２センサ端子部）１６１と、圧電素子１６２と、センサ電極部１７２等を含むセンサ端子部材（第１センサ端子部）１７１と、第１絶縁スペーサ１６３と、第２絶縁スペーサ１６４とからなる。また、センサキャップ１３１の内方突出部１３４の基端側には、筒状の樹脂成形体１８１が配置されている。   Next, the structure of the sensor unit 160 and the vicinity thereof will be described with reference to FIG. The sensor portion 160 has a core portion disposed inside the sensor cap 131 on the base end portion 121 k side of the housing main body 121. The sensor unit 160 includes a pressing fitting (second sensor terminal unit) 161, a piezoelectric element 162, a sensor terminal member (first sensor terminal unit) 171 including a sensor electrode unit 172, a first insulating spacer 163, a first 2 insulating spacers 164. In addition, a cylindrical resin molded body 181 is disposed on the proximal end side of the inward projecting portion 134 of the sensor cap 131.

センサ部１６０のうち、押圧金具１６１、圧電素子１６２、センサ電極部１７２及び第１絶縁スペーサ１６３は、基端側から先端側に向かってこの順番に積み重ねられて、センサキャップ１３１の内方突出部１３４と中軸スリーブ１５１の外方突出部１５３との間に狭持されている。これらは、それぞれリング状をなし、その内側に中軸スリーブ１５１の筒状本体１５２が挿通されている。また、第２絶縁スペーサ１６４は、中軸スリーブ１５１の外方突出部１５３とハウジング本体１２１の基端部１２１ｋとの間に配置されている。この第２絶縁スペーサ１６４は、リング状をなし、その内側に中軸本体１４１及び筒状部材１４８が挿通されている。   Of the sensor unit 160, the press fitting 161, the piezoelectric element 162, the sensor electrode unit 172, and the first insulating spacer 163 are stacked in this order from the proximal end side to the distal end side, and the inward projecting portion of the sensor cap 131. 134 is sandwiched between the outer projecting portion 153 of the central shaft sleeve 151. Each of these has a ring shape, and a cylindrical main body 152 of the center shaft sleeve 151 is inserted inside thereof. Further, the second insulating spacer 164 is disposed between the outward projecting portion 153 of the central shaft sleeve 151 and the proximal end portion 121 k of the housing main body 121. The second insulating spacer 164 has a ring shape, and the central shaft main body 141 and the cylindrical member 148 are inserted inside the second insulating spacer 164.

圧電素子１６２は、チタン酸ジルコン酸鉛から形成されて軸線方向に分極されており、軸線方向の圧縮応力の変化に基づいて、両端面にプラスあるいはマイナスの電荷を発生する。具体的には、圧電素子１６２は、軸線方向の圧縮応力が増加すると、その基端側面にマイナス電荷を発生し、先端側面にプラス電荷を発生するように配置されている。圧電素子１６２は、その基端側で押圧金具１６１に面同士で当接して電気的に接続すると共に、その先端側でセンサ電極部１７２に面同士で当接して電気的に接続している。また、センサキャップ１３１は、圧電素子１６２に軸線方向の圧縮力が掛かるようにして溶接固定されているため、圧電素子１６２には、常に軸線方向に圧縮荷重が掛かっている。   The piezoelectric element 162 is made of lead zirconate titanate and is polarized in the axial direction, and generates positive or negative charges on both end surfaces based on a change in compressive stress in the axial direction. Specifically, when the compressive stress in the axial direction increases, the piezoelectric element 162 is disposed so as to generate a negative charge on the base end side surface and generate a positive charge on the front end side surface. The piezoelectric element 162 is in electrical contact with the pressing metal fitting 161 at its proximal end and is electrically connected to the sensor electrode portion 172 at its distal end. Further, since the sensor cap 131 is fixed by welding so that a compressive force in the axial direction is applied to the piezoelectric element 162, a compressive load is always applied to the piezoelectric element 162 in the axial direction.

センサ端子部材１７１は、上記センサ電極部１７２と、このセンサ電極部１７２の周縁から径方向外側（図中左側）に突出すると共に基端側に延びるセンサ端子リード部１７４と、センサ端子リード部１７４と電気的に接続し、軸線方向に沿って基端側に延びて外部に露出する平板状のセンサ端子接続部１７５とからなる。このうちセンサ端子リード部１７４は、押圧金具１６１、内方突出部１３４の径方向外側を軸線方向に沿って基端側に延びた後、樹脂成形体１８１に設けられたスリット部１８３を通って更に基端側でかつ中心方向に延びている。なお、このセンサ端子リード部１７４は、電気的絶縁のために熱収縮チューブ１７６によって覆われている。そして、センサ端子リード部１７４の基端部分が樹脂成形体１８１から突出して、センサ端子接続部１７５と接続している。センサ端子接続部１７５は、径方向に見て、ハウジング１２０の基端部（センサキャップ１３１）の外周よりも内側に配置されている。センサ端子接続部１７５は、後述するコネクタ２１０を基端側から装着したときに、センサ用コネクタ端子部（第２コネクタ端子部）２３７と接触して電気的に接続される（図４参照）。   The sensor terminal member 171 includes the sensor electrode portion 172, a sensor terminal lead portion 174 that protrudes radially outward (left side in the drawing) from the periphery of the sensor electrode portion 172 and extends to the proximal end side, and the sensor terminal lead portion 174. And a flat sensor terminal connection part 175 extending to the base end side along the axial direction and exposed to the outside. Among these, the sensor terminal lead part 174 extends to the base end side along the axial direction on the radially outer side of the pressing fitting 161 and the inward projecting part 134, and then passes through the slit part 183 provided in the resin molded body 181. Furthermore, it extends in the center direction on the base end side. The sensor terminal lead 174 is covered with a heat shrinkable tube 176 for electrical insulation. The base end portion of the sensor terminal lead portion 174 protrudes from the resin molded body 181 and is connected to the sensor terminal connection portion 175. The sensor terminal connection portion 175 is disposed inside the outer periphery of the base end portion (sensor cap 131) of the housing 120 when viewed in the radial direction. The sensor terminal connecting portion 175 contacts and is electrically connected to the sensor connector terminal portion (second connector terminal portion) 237 when a connector 210 described later is mounted from the proximal end side (see FIG. 4).

このような構成とすることで、この燃焼圧検知機能付きグロープラグ１００を内燃機関に取り付けたときには、ハウジング１２０を通じて（センサキャップ１３１の内方突出部１３４を通じて）、センサ部１６０の押圧金具１６１を内燃機関に電気的に接地させることができる。これにより、内燃機関の燃焼圧を検知するには、センサ部１６０の押圧金具１６１に集まった電荷はハウジング１２０を通じて接地されるので、センサ部１６０のセンサ端子部材１７１と内燃機関やこれに導通する車体等との間で電荷を測定すれば足りる。このため、センサ部１６０の押圧金具１６１に集まった電荷を計測するための経路を別途設ける必要がない。よって、燃焼圧検知機能付きグロープラグ１００を単純な構造とすることができる。   With such a configuration, when the glow plug 100 with the combustion pressure detection function is attached to the internal combustion engine, the pressing fitting 161 of the sensor unit 160 is moved through the housing 120 (through the inward protruding portion 134 of the sensor cap 131). The internal combustion engine can be electrically grounded. Thereby, in order to detect the combustion pressure of the internal combustion engine, since the electric charge collected in the pressing fitting 161 of the sensor unit 160 is grounded through the housing 120, the sensor terminal member 171 of the sensor unit 160 is electrically connected to the internal combustion engine and this. It is sufficient to measure the electric charge between the vehicle body and the like. For this reason, it is not necessary to separately provide a path for measuring the electric charge collected in the pressing fitting 161 of the sensor unit 160. Therefore, the glow plug 100 with a combustion pressure detection function can be made into a simple structure.

また、センサ端子接続部１７５を、ハウジング１２０の基端部（センサキャップ１３１）の外周よりも径方向内側に配置することで、センサ端子接続部１７５とセンサ用コネクタ端子部２３７の接続が、径方向のより中心近傍で行われる。このため、燃焼圧検知機能付きグロープラグ１００の基端側部分における径方向の寸法や、コネクタ２１０の径方向の寸法を小さくでき、ひいてはグロープラグ接続構造体２００を小さくできる（図４参照）。   Further, by arranging the sensor terminal connection portion 175 radially inward from the outer periphery of the base end portion (sensor cap 131) of the housing 120, the connection between the sensor terminal connection portion 175 and the sensor connector terminal portion 237 is reduced in diameter. This is done closer to the center of the direction. For this reason, the radial dimension of the base end side portion of the glow plug 100 with the combustion pressure detecting function and the radial dimension of the connector 210 can be reduced, and the glow plug connection structure 200 can be reduced (see FIG. 4).

包囲部材１９０は、ハウジング１２０に固定され、センサ部１６０やセンサキャップ１３１等の軸線周りを包囲している。具体的には、包囲部材１９０は、先端側に位置し、主にセンサ部１６０及びセンサキャップ１３１を包囲する径大な径大筒状部１９１と、センサキャップ１３１よりも基端側に位置し、樹脂成形体１８１を包囲する径小な径小筒状部１９３と、これら径大筒状部１９１と径小筒状部１９３とを結ぶテーパ状の中間筒状部１９２とからなる。なお、包囲部材１９０内には、センサ部１６０等に水分や油分が付着して絶縁抵抗が低下するなど電気的性能の低下を防止するために、ゴム等からなる封止部材１６５が充填形成されている。   The surrounding member 190 is fixed to the housing 120 and surrounds the axis of the sensor unit 160, the sensor cap 131, and the like. Specifically, the surrounding member 190 is located on the distal end side, and is located on the proximal end side with respect to the large-diameter cylindrical portion 191 that mainly surrounds the sensor portion 160 and the sensor cap 131, and the sensor cap 131, A small-diameter cylindrical portion 193 surrounding the resin molded body 181 and a tapered intermediate cylindrical portion 192 connecting the large-diameter cylindrical portion 191 and the small-diameter cylindrical portion 193 are formed. The enclosing member 190 is filled with a sealing member 165 made of rubber or the like in order to prevent a decrease in electrical performance such as a decrease in insulation resistance due to moisture or oil adhering to the sensor unit 160 or the like. ing.

また、包囲部材１９０の基端側には、コネクタ２１０が挿入される樹脂ハウジング１８５が配設されている。この樹脂ハウジング１８５は、中軸本体１２１の基端や樹脂成形体１８１の基端、包囲部材１９０の基端等を取り囲む胴部１８６と、胴部１８６の外周から基端側に延びる角筒状の筒状部１８７とからなる。筒状部１８７には、自身の一部を貫通し、コネクタ２１０の固定に利用される係合部１８８が形成されている。なお、筒状部１８７の内側の空間には、前述した中軸端子接続部１５７及びセンサ端子接続部１７５がそれぞれ基端側に向かって突出している。   Further, a resin housing 185 into which the connector 210 is inserted is disposed on the proximal end side of the surrounding member 190. The resin housing 185 has a barrel portion 186 that surrounds the proximal end of the central shaft main body 121, the proximal end of the resin molded body 181, the proximal end of the surrounding member 190, and the like, and a rectangular tube shape that extends from the outer periphery of the barrel portion 186 to the proximal end side. It consists of a cylindrical part 187. The tubular portion 187 is formed with an engaging portion 188 that penetrates a part of itself and is used for fixing the connector 210. In addition, in the space inside the cylindrical part 187, the above-mentioned center shaft terminal connection part 157 and sensor terminal connection part 175 protrude toward the proximal end side.

次いで、この燃焼圧検知機能付きグロープラグ１００にコネクタ２１０を装着したグロープラグ接続構造体２００について、図４を参照しつつ説明する。
まず、コネクタ２１０について説明する。このコネクタ２１０は、燃焼圧検知機能付きグロープラグ１００に簡単に装着できるワンタッチ型コネクタである。このコネクタ２１０は、本発明の第１コネクタと第２コネクタとを一体化したものに相当する。このコネクタ２１０は、その外装をなすコネクタ外装部材２２０を有する。コネクタ外装部材２２０は、樹脂ハウジング１８５の筒状部１８７に嵌り込む角柱状の外形をなし、後述する各部材を内包する樹脂製の外装部材本体２２１と、これと一体形成され、燃焼圧検知機能付きグロープラグ１００への固定に利用される樹脂製の外装部材係合部２２３とからなる。外装部材係合部２２３は、外装部材本体２２１の基端側の外周の一部から外側に延びた後、先端側に延びている。そして、その先端側には段付部２２４が設けられている。この段付部２２４は、コネクタ２１０を装着した際に、燃焼圧検知機能付きグロープラグ１００の樹脂ハウジング１８５のうち、筒状部１８７の係合部１８８に係合して、コネクタ２１０が基端側に抜けることを防止する。 Next, the glow plug connection structure 200 in which the connector 210 is mounted on the glow plug 100 with the combustion pressure detection function will be described with reference to FIG.
First, the connector 210 will be described. This connector 210 is a one-touch type connector that can be easily attached to the glow plug 100 with the combustion pressure detecting function. The connector 210 corresponds to a combination of the first connector and the second connector of the present invention. The connector 210 has a connector exterior member 220 that forms the exterior thereof. The connector exterior member 220 has a prismatic outer shape that fits into the cylindrical portion 187 of the resin housing 185, and is integrally formed with a resin exterior member main body 221 that encloses each member described later, and has a combustion pressure detection function. And a resin exterior member engaging portion 223 used for fixing to the attached glow plug 100. The exterior member engaging portion 223 extends outward from a part of the outer periphery of the base end side of the exterior member main body 221 and then extends to the distal end side. And the step part 224 is provided in the front end side. The stepped portion 224 engages with the engaging portion 188 of the tubular portion 187 in the resin housing 185 of the glow plug 100 with the combustion pressure detecting function when the connector 210 is attached, so that the connector 210 is the base end. To prevent it from coming out to the side.

コネクタ外装部材２２０の内部には、金属製の第１コネクタ端子金具２３０及び第２コネクタ端子金具２３５が配設されている。
第１コネクタ端子金具２３０は、基端側に位置する第１リード把持部２３１と、先端側に位置する中軸用コネクタ端子部（第１コネクタ端子部）２３２とからなる。第１リード把持部２３１は、コネクタ内部から外部へ基端側に向かって取り出される第１リード線２４０を把持して、第１リード線２４０と電気的に接続している。また、中軸用コネクタ端子部２３２は、概略扁平筒状をなし、その先端がコネクタ外装部材２２０の内側において先端側に向かって露出している。この中軸用コネクタ端子部２３２は、燃焼圧検知機能付きグロープラグ１００の中軸端子部１５５のうち、平板状をなす中軸端子接続部１５７を内側に挿通して、中軸端子接続部１５７に軸線ＡＸに直交する平面に沿う方向で圧接して電気的に接続できる。 Inside the connector exterior member 220, a metal first connector terminal fitting 230 and a second connector terminal fitting 235 are disposed.
The first connector terminal fitting 230 includes a first lead gripping portion 231 located on the proximal end side and a middle-axis connector terminal portion (first connector terminal portion) 232 located on the distal end side. The first lead gripping portion 231 grips the first lead wire 240 taken out from the inside of the connector to the outside toward the base end side, and is electrically connected to the first lead wire 240. Further, the middle-axis connector terminal portion 232 has a substantially flat cylindrical shape, and the tip thereof is exposed toward the tip side inside the connector exterior member 220. The middle shaft connector terminal portion 232 is inserted through the middle shaft terminal connection portion 157 having a flat plate shape in the middle shaft terminal portion 155 of the glow plug 100 with the combustion pressure detection function, and the center shaft terminal connection portion 157 is connected to the axis AX. It can be pressed and electrically connected in a direction along an orthogonal plane.

また、第２コネクタ端子金具２３５は、基端側に位置する第２リード把持部２３６と、先端側に位置するセンサ用コネクタ端子部（第２コネクタ端子部）２３７とからなる。第２リード把持部２３６は、コネクタ内部から外部へ基端側に向かって取り出される第２リード線２４５を把持して、第２リード線２４５と電気的に接続している。また、センサ用コネクタ端子部２３７は、概略扁平筒状をなし、その先端がコネクタ外装部材２２０の内側において先端側に向かって露出している。このセンサ用コネクタ端子部２３７は、燃焼圧検知機能付きグロープラグ１００のセンサ端子部材１７１のうち、平板状をなすセンサ端子接続部１７５を内側に挿通して、センサ端子接続部１７５に軸線ＡＸに直交する平面に沿う方向で圧接して電気的に接続できる。   The second connector terminal fitting 235 includes a second lead gripping portion 236 located on the proximal end side and a sensor connector terminal portion (second connector terminal portion) 237 located on the distal end side. The second lead gripping part 236 grips the second lead wire 245 that is taken out from the inside of the connector to the outside toward the base end side, and is electrically connected to the second lead wire 245. Further, the sensor connector terminal portion 237 has a substantially flat cylindrical shape, and the tip thereof is exposed toward the tip side inside the connector exterior member 220. The sensor connector terminal portion 237 is inserted through the sensor terminal connection portion 175 having a flat plate shape in the sensor terminal member 171 of the glow plug 100 with the combustion pressure detection function, and is connected to the sensor terminal connection portion 175 along the axis AX. It can be pressed and electrically connected in a direction along an orthogonal plane.

このようなコネクタ２１０を、基端側から燃焼圧検知機能付きグロープラグ１００に装着することで、図４に示すグロープラグ接続構造体２００が構成される。この状態でコネクタ２１０は、軸線方向に見て、その半分以上が燃焼圧検知機能付きグロープラグ１００の樹脂ハウジング１８５の筒状部１８７内に挿入され、外装部材係合部２２３の段付部２２４が、筒状部１８７の係合部１８８に係合している。   By attaching such a connector 210 to the glow plug 100 with the combustion pressure detection function from the base end side, the glow plug connection structure 200 shown in FIG. 4 is configured. In this state, the connector 210 is inserted in the cylindrical portion 187 of the resin housing 185 of the glow plug 100 with the combustion pressure detecting function when viewed in the axial direction, and the stepped portion 224 of the exterior member engaging portion 223 is inserted. Is engaged with the engaging portion 188 of the tubular portion 187.

また、中軸用コネクタ端子部２３２に、燃焼圧検知機能付きグロープラグ１００の中軸端子部１５５の中軸端子接続部１５７が挿通されて、これらが軸線ＡＸに直交する平面に沿う方向で互いに圧接して電気的に接続している。また、センサ用コネクタ端子部２３７に、燃焼圧検知機能付きグロープラグ１００のセンサ端子部材１７１のセンサ端子接続部１７５が挿通されて、これらが軸線ＡＸに直交する平面に沿う方向で互いに圧接して電気的に接続している。   Further, the middle shaft terminal connecting portion 157 of the middle shaft terminal portion 155 of the glow plug 100 with the combustion pressure detecting function is inserted into the middle shaft connector terminal portion 232, and these are pressed against each other in a direction along a plane orthogonal to the axis AX. Electrically connected. Further, the sensor terminal connecting portion 175 of the sensor terminal member 171 of the glow plug 100 with the combustion pressure detecting function is inserted into the sensor connector terminal portion 237, and they are pressed against each other in a direction along a plane orthogonal to the axis AX. Electrically connected.

このグロープラグ接続構造体２００では、従来においてセンサ部１６０からのセンサ出力信号を外部へ導くために利用していたケーブルを無くすことができる。また、コネクタ２１０を基端側から装着すればグロープラグ接続構造体２００を構成できるので、グロープラグ接続構造体２００が容易にできる。加えて、コネクタ２１０を軸線方向基端側に装着してあるので、使用時には内燃機関の振動に同調してコネクタ２１０も軸線方向に振動する。このため、センサ出力信号に歪みが生じにくく、内燃機関の燃焼圧をより正確に検知できる。   In this glow plug connection structure 200, it is possible to eliminate a cable that has been used to guide a sensor output signal from the sensor unit 160 to the outside. Further, since the glow plug connection structure 200 can be configured by attaching the connector 210 from the base end side, the glow plug connection structure 200 can be facilitated. In addition, since the connector 210 is mounted on the base end side in the axial direction, the connector 210 also vibrates in the axial direction in synchronization with the vibration of the internal combustion engine during use. For this reason, the sensor output signal is hardly distorted, and the combustion pressure of the internal combustion engine can be detected more accurately.

また、本参考形態では、１つのコネクタ２１０を装着することで、中軸端子接続部１５７と中軸用コネクタ端子部２３２との接続、及び、センサ端子接続部１７５とセンサ用コネクタ端子部２３７との接続を同時に行えるので、コネクタ２１０を２つに分けた場合に比して、グロープラグ接続構造体２００を容易に構成できる。また、コネクタ２１０自身を安価にすることができる。 Further, in this reference embodiment , by attaching one connector 210, the connection between the middle shaft terminal connection portion 157 and the middle shaft connector terminal portion 232 and the connection between the sensor terminal connection portion 175 and the sensor connector terminal portion 237 are performed. Therefore, the glow plug connection structure 200 can be easily configured as compared with the case where the connector 210 is divided into two. Further, the connector 210 itself can be made inexpensive.

更に、本参考形態では、中軸端子接続部１５７と中軸用コネクタ端子部２３２とは、軸線ＡＸに直交する平面に沿う方向に圧接している。このため、使用時に、軸線方向の振動により中軸接続端子部１５７と中軸用コネクタ端子部２３２とが軸線方向に相対的に移動しても、中軸接続端子部１５７と中軸用コネクタ端子部２３２とが圧接した状態を確実に維持できる。また、センサ端子接続部１７５とセンサ用コネクタ端子部２３７も、軸線ＡＸに直交する平面に沿う方向に圧接している。このため、使用時に、軸線方向の振動によりセンサ端子接続部１７５とセンサ用コネクタ端子部２３７とが軸線方向に相対的に移動しても、センサ接続端子部１７５とセンサ用コネクタ端子部２３７とが圧接した状態を確実に維持できる。従って、使用時にコネクタ２１０との接続が断続してセンサ出力信号にノイズが生じることを抑制でき、従来よりも正確に内燃機関の燃焼圧を検知できる。 Further, in the present embodiment , the middle shaft terminal connecting portion 157 and the middle shaft connector terminal portion 232 are in pressure contact with each other along a plane perpendicular to the axis AX. Therefore, during use, even if the middle shaft connection terminal portion 157 and the middle shaft connector terminal portion 232 move relatively in the axial direction due to vibration in the axial direction, the middle shaft connection terminal portion 157 and the middle shaft connector terminal portion 232 are The pressed state can be reliably maintained. Further, the sensor terminal connecting portion 175 and the sensor connector terminal portion 237 are also in pressure contact in a direction along a plane orthogonal to the axis AX. For this reason, even if the sensor terminal connection part 175 and the sensor connector terminal part 237 move relatively in the axial direction due to vibration in the axial direction during use, the sensor connection terminal part 175 and the sensor connector terminal part 237 do not move. The pressed state can be reliably maintained. Therefore, it is possible to suppress the occurrence of noise in the sensor output signal due to intermittent connection with the connector 210 during use, and the combustion pressure of the internal combustion engine can be detected more accurately than in the past.

次いで、燃焼圧検知機能付きグロープラグ１００の製造方法について説明する。
まず、公知の手法により形成したヒータ部材１１０の基端側を、ヒータ保持部材１２６に圧入固定し、更に、ヒータ部材１１０の基端部１１０ｋを接続リング１１７を介して中軸本体１４１の先端部１４０ｓに結合する（図２参照）。次に、ヒータ保持部材１２６とハウジング本体１２１をレーザ溶接により固定する。その後、ハウジング本体１２１と中軸本体１４１との間隙に基端側からＯリング１４９を押し込み、更に筒状部材１４８を差し込む（図３参照）。また、第２絶縁スペーサ１６４をハウジング本体１２１の基端部１２１ｋ上に配置する。 Next, a manufacturing method of the glow plug 100 with the combustion pressure detection function will be described.
First, the proximal end side of the heater member 110 formed by a known method is press-fitted and fixed to the heater holding member 126, and the proximal end portion 110 k of the heater member 110 is connected to the distal end portion 140 s of the central shaft main body 141 via the connection ring 117. (See FIG. 2). Next, the heater holding member 126 and the housing main body 121 are fixed by laser welding. Thereafter, the O-ring 149 is pushed into the gap between the housing main body 121 and the central shaft main body 141 from the base end side, and the cylindrical member 148 is further inserted (see FIG. 3). Further, the second insulating spacer 164 is disposed on the base end part 121 k of the housing body 121.

次に、中軸スリーブ１５１に予め絶縁チューブ１５４を被せておき、中軸スリーブ１５１の外方突出部１５３の基端側に、第１絶縁スペーサ１６３、センサ電極部１７２、圧電素子１６２、及び、押圧金具１６１をこの順に挿通する（図３参照）。その後、この状態の中軸スリーブ１５１に、その先端側からハウジング本体１２１等に組み付けた中軸本体１４１を挿入して、中軸スリーブ１５１の外方突出部１５３を第２絶縁スペーサ１７４に当接させる（図３参照）。その後、これに基端側からセンサキャップ１３１を装着し、先端側に向けて所定の押圧力で押圧する。そしてこの状態で、センサキャップ１３１の環状部１３３をハウジング本体１２１の基端部１２１ｋの外周にＹＡＧレーザを用いて全周にわたり溶接する。更にその後、中軸スリーブ１５１の基端を中軸本体１４１に全周にわたりアーク溶接する。その後、樹脂成形体１８１をセンサキャップ１３１の内方突出部１３４上に配置する（図５参照）。   Next, an insulating tube 154 is put on the intermediate shaft sleeve 151 in advance, and the first insulating spacer 163, the sensor electrode portion 172, the piezoelectric element 162, and the pressing fitting are provided on the proximal end side of the outward projecting portion 153 of the intermediate shaft sleeve 151. 161 is inserted in this order (see FIG. 3). Thereafter, the intermediate shaft main body 141 assembled to the housing main body 121 and the like is inserted into the intermediate shaft sleeve 151 in this state from the front end side thereof, and the outward projecting portion 153 of the intermediate shaft sleeve 151 is brought into contact with the second insulating spacer 174 (FIG. 3). After that, the sensor cap 131 is attached to this from the proximal end side, and is pressed toward the distal end side with a predetermined pressing force. In this state, the annular portion 133 of the sensor cap 131 is welded to the outer periphery of the base end portion 121k of the housing main body 121 over the entire periphery using a YAG laser. Thereafter, the base end of the middle shaft sleeve 151 is arc welded to the middle shaft main body 141 over the entire circumference. Thereafter, the resin molded body 181 is disposed on the inward protruding portion 134 of the sensor cap 131 (see FIG. 5).

次に、図６に示すように、接続したセンサ端子リード部１７４を基端側に折り曲げて、これを樹脂成形体１８１のスリット１８３に挿入し、更に、基端側へ向けて折り曲げる。その後、中軸本体１４１の基端に、中軸端子部１５５の中軸端子筒状部１５６を取り付ける。また、センサ端子リード部１７４の基端にセンサ端子接続部１７５を接合する。   Next, as shown in FIG. 6, the connected sensor terminal lead part 174 is bent toward the base end, inserted into the slit 183 of the resin molded body 181, and further bent toward the base end. Thereafter, the middle shaft terminal tubular portion 156 of the middle shaft terminal portion 155 is attached to the proximal end of the middle shaft main body 141. Further, the sensor terminal connecting portion 175 is joined to the base end of the sensor terminal lead portion 174.

次に、包囲部材１９０を基端側からハウジング１２０に装着し、レーザ溶接により固定する。また、包囲部材１９０内にゴムを充填し、更に硬化させて、封止部材１６５を形成する（図３参照）。その後、樹脂のインサート成形により、樹脂ハウジング１８５を包囲部材１９０の基端側に形成する。かくして、燃焼圧検知機能付きグロープラグ１００が完成する。なお、コネクタ２１０は、公知の手法により製造すればよい。   Next, the surrounding member 190 is attached to the housing 120 from the base end side and fixed by laser welding. Further, the enclosing member 190 is filled with rubber and further cured to form the sealing member 165 (see FIG. 3). Thereafter, the resin housing 185 is formed on the proximal end side of the surrounding member 190 by resin insert molding. Thus, the glow plug 100 with a combustion pressure detection function is completed. The connector 210 may be manufactured by a known method.

（実施形態）
次いで、本発明の実施形態について説明する。なお、上記参考形態と同様な部分の説明は、省略または簡略化する。図７〜図９に本実施形態の燃焼圧検知機能付きグロープラグ３００を示す。また、図１０にこの燃焼圧検知機能付きグロープラグ３００にコネクタ４１０を装着したグロープラグ接続構造体４００を示す。なお、図７〜図１０においても、図中下方が軸線方向先端側（先端側）、図中上方が軸線方向基端側（基端側）である。 ( Embodiment )
Next, embodiments of the present invention will be described. Note that the description of the same parts as those in the reference embodiment is omitted or simplified. 7 to 9 show a glow plug 300 with a combustion pressure detection function of the present embodiment . FIG. 10 shows a glow plug connection structure 400 in which a connector 410 is attached to the glow plug 300 with a combustion pressure detection function. 7 to 10, the lower side in the drawing is the axial front end side (front end side), and the upper side in the drawing is the axial base end side (base end side).

図７に示すように、この燃焼圧検知機能付きグロープラグ３００も、筒状のハウジング３２０、棒状の中軸３４０、棒状のヒータ部材３１０、センサ部３６０、包囲部材３９０等から構成されている。   As shown in FIG. 7, this glow plug 300 with a combustion pressure detection function is also composed of a cylindrical housing 320, a rod-shaped center shaft 340, a rod-shaped heater member 310, a sensor portion 360, a surrounding member 390, and the like.

このうちヒータ部材３１０は、上記参考形態のヒータ部材１１０と同様である。即ち、図８に示すように、ヒータ部材３１０の先端部３１０ｓの内部にヒータ発熱部３１１が設けられ、ヒータ部材３１０の基端側外周面の所定位置に第１ヒータ端子部３１３及び第２ヒータ端子部３１２が設けられている。また、これらを電気的に結ぶヒータ導電路３１５，３１４も設けられている。 Among them, the heater member 310 is the same as the heater member 110 of the reference embodiment . That is, as shown in FIG. 8, the heater heat generating portion 311 is provided inside the distal end portion 310 s of the heater member 310, and the first heater terminal portion 313 and the second heater are disposed at predetermined positions on the outer peripheral surface of the proximal end side of the heater member 310. A terminal portion 312 is provided. Heater conductive paths 315 and 314 that electrically connect them are also provided.

図７〜図９に示すように、ハウジング３２０も、上記参考形態のハウジング１２０と概略同様であり、ハウジング本体３２１とヒータ保持部材３２６とセンサキャップ３３１とから構成されている。ハウジング本体３２１には、雄ネジ部３２２や工具係合部３２３が形成されている（図７及び図９参照）。 As shown in FIGS. 7 to 9, the housing 320 is also substantially the same as the housing 120 of the above-described reference embodiment , and includes a housing body 321, a heater holding member 326, and a sensor cap 331. The housing main body 321 is formed with a male screw portion 322 and a tool engaging portion 323 (see FIGS. 7 and 9).

また、図８に示すように、ヒータ保持部材３２６にはヒータ部材３１０が圧入され、ヒータ保持部材３２６とヒータ部材３１０の第２ヒータ端子部３１２とが電気的に接続されている。また、ヒータ部材３１０の基端部３１０ｋは、接続リング３１７に圧入され、この接続リング３１７には、その基端側から中軸３４０（中軸本体３４１）の先端部３４０ｓが挿入されて溶接固定されている。これにより、中軸３４０とヒータ部材３１０の第１ヒータ端子部３１３とが電気的に接続されている。また、図９に示すように、センサキャップ３３１は、一部（図中左側）が軸線方向に沿って開口した略筒状の形態をなす胴部３３２と、胴部３３２の先端側に位置する円環状の環状部３３３と、胴部３３２の基端から軸線方向に直交して径方向内側に突出する内方突出部３３４とからなる。   Further, as shown in FIG. 8, the heater member 310 is press-fitted into the heater holding member 326, and the heater holding member 326 and the second heater terminal portion 312 of the heater member 310 are electrically connected. The proximal end portion 310k of the heater member 310 is press-fitted into the connection ring 317, and the distal end portion 340s of the intermediate shaft 340 (the intermediate shaft main body 341) is inserted into the connection ring 317 from the proximal end side and fixed by welding. Yes. Thereby, the middle shaft 340 and the first heater terminal portion 313 of the heater member 310 are electrically connected. As shown in FIG. 9, the sensor cap 331 is positioned on the front end side of the body portion 332 and a body portion 332 having a substantially cylindrical shape with a part (left side in the drawing) opened along the axial direction. An annular part 333 having an annular shape and an inward projecting part 334 projecting radially inward from the base end of the body part 332 perpendicular to the axial direction.

このような構成とすることで、この燃焼圧検知機能付きグロープラグ３００を内燃機関に取り付けたときには、ハウジング３２０を通じて、第２ヒータ端子部３１２を内燃機関に接地させることができる。従って、ヒータ部材３１０を昇温させるには、中軸３４０を通じて、ヒータ部材３１０に電流を流せばよく、第２ヒータ端子部３１２から出た電流は、ハウジング３２０を通じて接地されるので、電流の帰路を別途設ける必要がない。よって、燃焼圧検知機能付きグロープラグ３００を単純な構造とすることができる。   With this configuration, when the glow plug 300 with the combustion pressure detection function is attached to the internal combustion engine, the second heater terminal portion 312 can be grounded to the internal combustion engine through the housing 320. Accordingly, in order to raise the temperature of the heater member 310, it is sufficient to pass a current through the heater member 310 through the middle shaft 340, and the current output from the second heater terminal portion 312 is grounded through the housing 320, so that the current return path is reduced. There is no need to provide it separately. Therefore, the glow plug 300 with a combustion pressure detection function can be made into a simple structure.

中軸３４０は、軸線方向に棒状に延びる中軸本体３４１と、中軸本体３４１の基端側に固定された棒状をなす中軸端子部３５５と、中軸本体３４１を内挿して中軸本体３４１に固定された筒状の中軸スリーブ３５１とを有する。このうち中軸スリーブ３５１は、上記参考形態と同様に、その外周が絶縁チューブ３５４で包囲された筒状の筒状本体３５２と、フランジ状の外方突出部３５３とを有する。また、中軸本体３４１とハウジング本体３２１との間に形成された空間には、上記参考形態と同様に、Ｏリング３４９及び筒状部材３４８が配置されている。 The middle shaft 340 includes a middle shaft main body 341 that extends in a bar shape in the axial direction, a middle shaft terminal portion 355 that forms a rod shape that is fixed to the base end side of the middle shaft main body 341, and a cylinder that is fixed to the middle shaft main body 341 by inserting the middle shaft main body 341. And an intermediate shaft sleeve 351. Among these, the central shaft sleeve 351 has a cylindrical cylindrical main body 352 whose outer periphery is surrounded by an insulating tube 354 and a flange-shaped outward projecting portion 353, as in the above-described reference embodiment . Further, an O-ring 349 and a cylindrical member 348 are disposed in the space formed between the central shaft main body 341 and the housing main body 321 as in the above-described reference embodiment .

本実施形態の中軸端子部３５５は、径方向の中心に位置して基端側に延び、全体がプラグ外部に露出している。中軸端子部３５５は、基端側に位置する径小な基端部３５５ｋと、先端側に位置する先端部３５５ｓと、これらの間に位置する径大な中間部（中軸端子接続部）３５５ｔとからなる。そして、中間部３５５ｔには、径方向外側に僅かに突出する凸部３５７が全周にわたって設けられている。この凸部３５７は、コネクタ４１０の固定に利用される。また、中軸端子部３５５は、その先端側に雌ネジ部３５６を有する。そして、この雌ネジ部３５６と中軸本体３４１の基端に形成された雄ネジ部３４２とがネジ止めされ、更に加締め加工されることにより、中軸端子部３５５が中軸本体３４１に固定されている。このような中軸端子部３５５は、中間部３５５ｔが本発明の中軸端子接続部に相当し、後述するコネクタ４１０を基端側から装着したときに、中軸用コネクタ端子部（第１コネクタ端子部）４３２と接触して電気的に接続される（図１０参照）。 The middle shaft terminal portion 355 of the present embodiment is located at the center in the radial direction and extends to the proximal end side, and is entirely exposed to the outside of the plug. The middle shaft terminal portion 355 includes a proximal end portion 355k having a small diameter located on the proximal end side, a distal end portion 355s located on the distal end side, and a large diameter intermediate portion (medium shaft terminal connecting portion) 355t positioned therebetween. Consists of. The intermediate portion 355t is provided with a convex portion 357 that slightly protrudes radially outward over the entire circumference. The convex portion 357 is used for fixing the connector 410. Further, the middle shaft terminal portion 355 has a female screw portion 356 on the tip side. The female screw portion 356 and the male screw portion 342 formed at the base end of the central shaft main body 341 are screwed and further crimped to fix the central shaft terminal portion 355 to the central shaft main body 341. . The intermediate shaft terminal portion 355 has an intermediate portion 355t corresponding to the intermediate shaft terminal connection portion of the present invention. When a connector 410 to be described later is attached from the proximal end side, the intermediate shaft connector terminal portion (first connector terminal portion). It contacts and electrically connects to 432 (refer FIG. 10).

このような中軸端子部３５５も、上記参考形態と同様に、径方向に見てハウジング３２０の基端部（センサキャップ３３１）の外周よりも内側に配置されているので、中軸端子部３５５と中軸用コネクタ端子部４３２との接続が、径方向のより中心近傍で行われる。このため、燃焼圧検知機能付きグロープラグ３００の基端側部分における径方向の寸法や、コネクタ４１０の径方向の寸法を小さくでき、ひいてはグロープラグ接続構造体４００を小さくできる（図１０参照）。 Similarly to the above-described reference embodiment , the middle shaft terminal portion 355 is also disposed on the inner side of the outer periphery of the base end portion (sensor cap 331) of the housing 320 when viewed in the radial direction. The connection with the connector terminal portion 432 is performed closer to the center in the radial direction. For this reason, the radial dimension of the base end side portion of the glow plug 300 with the combustion pressure detection function and the radial dimension of the connector 410 can be reduced, and the glow plug connection structure 400 can be reduced (see FIG. 10).

次に、図９を参照しつつ、センサ部３６０及びその近傍の構造について説明する。このセンサ部３６０も、上記参考形態と同様に、その中核をなす部分が、ハウジング本体３２１の基端部３２１ｋ上において、センサキャップ３３１の内側に配設されている。センサ部３６０は、押圧金具（第２センサ端子部）３６１と、圧電素子３６２と、センサ電極部３７２等を含むセンサ端子部材（第１センサ端子部）３７１と、第１絶縁スペーサ３６３と、第２絶縁スペーサ３６４とからなる。また、センサキャップ３３１の内方突出部３３４の基端側には、筒状の樹脂成形体３８１が配置されている。更に、本実施形態では、上記参考形態の封止部材１６５と同様に、包囲部材３９０内には、ゴム等からなる封止部材３６５が充填形成されている。 Next, the sensor unit 360 and the structure in the vicinity thereof will be described with reference to FIG. Similarly to the above-described reference embodiment , the sensor portion 360 has a central portion disposed on the inner side of the sensor cap 331 on the base end portion 321k of the housing body 321. The sensor unit 360 includes a pressing fitting (second sensor terminal unit) 361, a piezoelectric element 362, a sensor terminal member (first sensor terminal unit) 371 including a sensor electrode unit 372, a first insulating spacer 363, 2 insulating spacers 364. In addition, a cylindrical resin molded body 381 is disposed on the proximal end side of the inward projecting portion 334 of the sensor cap 331. Furthermore, in this embodiment , the sealing member 365 made of rubber or the like is filled and formed in the surrounding member 390, like the sealing member 165 of the reference embodiment .

センサ部３６０のうち、センサ端子部材３７１の一部を除く、押圧金具３６１、圧電素子３６２、センサ電極部３７２、第１絶縁スペーサ３６３、及び、第２絶縁スペーサ３６４は、それぞれ上記参考形態と同様である。センサ端子部材３７１は、上記センサ電極部３７２と、このセンサ電極部３７２の周縁から一方（図中左側）に突出すると共に基端側に延びるセンサ端子リード部３７４と、センサ端子リード部３７４と電気的に接続して外部に露出するセンサ端子接続部３７５とからなる。なお、センサ端子リード部３７４は、電気的絶縁のために熱収縮チューブ３７６によって覆われている。 Of the sensor unit 360, the pressing fitting 361, the piezoelectric element 362, the sensor electrode unit 372, the first insulating spacer 363, and the second insulating spacer 364, excluding a part of the sensor terminal member 371, are the same as in the above reference embodiment. It is. The sensor terminal member 371 includes the sensor electrode portion 372, a sensor terminal lead portion 374 that protrudes from the periphery of the sensor electrode portion 372 to the one side (left side in the figure) and extends to the base end side, and the sensor terminal lead portion 374 Sensor terminal connection part 375 that is connected to the outside and exposed to the outside. The sensor terminal lead 374 is covered with a heat shrinkable tube 376 for electrical insulation.

このうちセンサ端子リード部３７４は、押圧金具３６１、内方突出部３３４の外側を軸線方向に沿って基端側に延びた後、樹脂成形体３８１の外周に沿って基端側かつ中心側に延び、更に基端側に延びて、センサ端子接続部３７５と電気的に接続している。本参考形態のセンサ端子接続部３７５は、上記参考形態とは形状が異なり、Ｃ型リング状をなす。このセンサ端子接続部３７５は、樹脂成形体３８１の径小な基端部３８２の外周を軸線周りに覆っている。センサ端子接続部３７５は、後述するコネクタ４１０を基端側から装着したときに、センサ用コネクタ端子部（第２コネクタ端子部）４３７と接触して電気的に接続される（図１０参照）。 Among these, the sensor terminal lead portion 374 extends to the proximal end side along the axial direction on the outer side of the pressing fitting 361 and the inward projecting portion 334, and then toward the proximal end and the central side along the outer periphery of the resin molded body 381. It extends further to the base end side and is electrically connected to the sensor terminal connection part 375. The sensor terminal connection portion 375 of the present reference embodiment is different in shape from the reference embodiment and has a C-shaped ring shape. The sensor terminal connection portion 375 covers the outer periphery of the base end portion 382 with a small diameter of the resin molded body 381 around the axis. The sensor terminal connecting portion 375 comes into contact with and electrically connects to the sensor connector terminal portion (second connector terminal portion) 437 when a connector 410 described later is mounted from the proximal end side (see FIG. 10).

このような構成とすることで、この燃焼圧検知機能付きグロープラグ３００を内燃機関に取り付けたときには、ハウジング３２０を通じて（センサキャップ３３１の内方突出部３３４を通じて）、センサ部３６０の押圧金具３６１を内燃機関に電気的に接地させることができる。これにより、内燃機関の燃焼圧を検知するには、センサ部３６０の押圧金具３６１に集まった電荷はハウジング３２０を通じて接地されるので、センサ部３６０のセンサ端子部材３７１と内燃機関やこれに導通する車体等との間で電荷を測定すれば足りる。このため、センサ部３６０の押圧金具３６１に集まった電荷を計測するための経路を別途設ける必要がない。よって、燃焼圧検知機能付きグロープラグ３００を単純な構造とすることができる。   With this configuration, when the glow plug 300 with the combustion pressure detection function is attached to the internal combustion engine, the pressing fitting 361 of the sensor unit 360 is connected through the housing 320 (through the inward protruding portion 334 of the sensor cap 331). The internal combustion engine can be electrically grounded. Thereby, in order to detect the combustion pressure of the internal combustion engine, the electric charge collected in the pressing fitting 361 of the sensor unit 360 is grounded through the housing 320, so that it is electrically connected to the sensor terminal member 371 of the sensor unit 360 and the internal combustion engine. It is sufficient to measure the electric charge between the vehicle body and the like. For this reason, it is not necessary to separately provide a path for measuring the electric charge collected in the pressing fitting 361 of the sensor unit 360. Therefore, the glow plug 300 with a combustion pressure detection function can be made into a simple structure.

また、センサ端子接続部３７５は、径方向に見てハウジング３２０の基端部（センサキャップ３３１）の外周よりも内側に配置されているので、センサ端子接続部３７５とセンサ用コネクタ端子部４３７との接続が、径方向のより中心近傍で行われる。このため、燃焼圧検知機能付きグロープラグ３００の基端側部分における径方向の寸法や、コネクタ４１０の径方向の寸法を小さくでき、ひいてはグロープラグ接続構造体４００を小さくできる（図１０参照）。   Further, since the sensor terminal connection portion 375 is disposed inside the outer periphery of the base end portion (sensor cap 331) of the housing 320 when viewed in the radial direction, the sensor terminal connection portion 375, the sensor connector terminal portion 437, and the like. Are connected closer to the center in the radial direction. For this reason, the radial dimension of the base end side portion of the glow plug 300 with the combustion pressure detection function and the radial dimension of the connector 410 can be reduced, and the glow plug connection structure 400 can be reduced (see FIG. 10).

包囲部材３９０は、円筒状をなし、その基端がハウジング３２０に固定されている。包囲部材３９０は、センサ部３６０やセンサキャップ３３１、樹脂成形体３８１等の軸線周りを包囲している。   The surrounding member 390 has a cylindrical shape, and a base end thereof is fixed to the housing 320. The surrounding member 390 surrounds the sensor unit 360, the sensor cap 331, the resin molded body 381, and the like around the axis.

次いで、この燃焼圧検知機能付きグロープラグ３００にコネクタ４１０を装着したグロープラグ接続構造体４００について、図１０を参照しつつ説明する。
まず、コネクタ４１０について説明する。このコネクタ４１０も、本発明の第１コネクタと第２コネクタとを一体化したものに相当する。このコネクタ４１０は、その外装をなすコネクタ外装部材４２０を有する。このコネクタ外装部材４２０は、外形が円柱状をなし、後述する各部材を内包する樹脂製の外装部材本体４２１と、この外装部材本体４２１の先端側の径大な開口内周面から径方向内側に全周にわたって突出する２つのシール突出部４２３とを有する。このシール突出部４２３は、コネクタ４１０を装着したときに、燃焼圧検知機能付きグロープラグ３００の包囲部材３９０の基端側外周面に圧接して、コネクタ４１０が基端側に抜けることを防止すると共に、コネクタ４１０の内部に水が侵入することを防止する。 Next, a glow plug connection structure 400 in which a connector 410 is mounted on the glow plug 300 with a combustion pressure detection function will be described with reference to FIG.
First, the connector 410 will be described. The connector 410 also corresponds to an integrated first connector and second connector of the present invention. The connector 410 has a connector exterior member 420 that forms the exterior thereof. The connector exterior member 420 has a cylindrical outer shape, and includes a resin exterior member main body 421 enclosing each member to be described later, and a radially inner side from a large-diameter opening inner peripheral surface on the distal end side of the exterior member main body 421. And two seal protrusions 423 protruding over the entire circumference. When the connector 410 is attached, the seal protrusion 423 presses against the outer peripheral surface of the base end side of the surrounding member 390 of the glow plug 300 with the combustion pressure detecting function, and prevents the connector 410 from coming out to the base end side. At the same time, water is prevented from entering the connector 410.

コネクタ外装部材４２０の内部には、その軸線ＡＸ上に金属製の第１コネクタ端子金具４３０が配設されている。第１コネクタ端子金具４３０は、基端側に位置する第１リード把持部４３１と、先端側に位置する中軸用コネクタ端子部（第１コネクタ端子部）４３２とからなる。第１リード把持部４３１は、コネクタ内部から外部へ基端側に向かって取り出される第１リード線４４０を把持して、第１リード線４４０と電気的に接続している。   Inside the connector exterior member 420, a metal first connector terminal fitting 430 is disposed on the axis AX. The first connector terminal fitting 430 includes a first lead gripping portion 431 located on the proximal end side and a middle shaft connector terminal portion (first connector terminal portion) 432 located on the distal end side. The first lead gripping portion 431 grips the first lead wire 440 taken out from the inside of the connector toward the base end side and is electrically connected to the first lead wire 440.

また、中軸用コネクタ端子部４３２は、略筒状をなし、その先端がコネクタ外装部材４２０の内側において先端側に向かって突出し露出している。中軸用コネクタ端子部４３２には、径方向外側に凹む係合凹部４３３が設けられている。この中軸用コネクタ端子部４３２は、燃焼圧検知機能付きグロープラグ３００の中軸端子部３５５を内側に挿通して、中軸端子部３５５の中間部３５５ｔに軸線方向と直交する方向で圧接して電気的に接続できる。また、中軸用コネクタ端子部４３２と中軸端子部３５５の中間部３５５ｔとは、軸線周りのいずれの方位についてでも圧接できる。その際、中軸端子部３５５の中間部３５５ｔに設けられた凸部３５７が、中軸用コネクタ端子部４３２に設けられた係合凹部４３３に係合して、コネクタ４１０が基端側に抜けることが防止される。   Further, the middle-axis connector terminal portion 432 has a substantially cylindrical shape, and its tip protrudes toward the tip side inside the connector exterior member 420 and is exposed. The middle shaft connector terminal portion 432 is provided with an engaging recess 433 that is recessed radially outward. The middle shaft connector terminal portion 432 is inserted into the middle shaft terminal portion 355 of the glow plug 300 with the combustion pressure detecting function inward, and is pressed into an intermediate portion 355t of the middle shaft terminal portion 355 in a direction perpendicular to the axial direction. Can be connected. Further, the middle shaft connector terminal portion 432 and the middle portion 355t of the middle shaft terminal portion 355 can be pressed in any direction around the axis. At this time, the convex portion 357 provided in the intermediate portion 355t of the middle shaft terminal portion 355 engages with the engagement concave portion 433 provided in the middle shaft connector terminal portion 432, and the connector 410 may be pulled out to the proximal end side. Is prevented.

また、コネクタ外装部材４２０の内部には、筒状をなす第２コネクタ端子金具４３５が配設され、更に、第２コネクタ端子部４３５の先端側外周には、円筒状をなす樹脂製の補強部材４３９が配設されている。第２コネクタ端子金具４３５は、その基端側がコネクタ外装部材４２０内に埋設され、コネクタ内部から外部へ取り出される第２リード線４４５と電気的に接続している。また、第２コネクタ端子金具４３５のうち先端側に位置するセンサ用コネクタ端子部（第２コネクタ端子部）４３７は、径方向内側に突出している。このセンサ用コネクタ端子部４３７は、燃焼圧検知機能付きグロープラグ３００のセンサ端子部材３７１のうち、リング状をなすセンサ端子接続部３７５を内側に挿通して、センサ端子接続部３７５に軸線方向と直交する方向で接触して電気的に接続できる。また、センサ用コネクタ端子部４３７とセンサ端子接続部３７５とは、軸線周りのいずれの方位についてでも圧接できる。   Also, a second connector terminal fitting 435 having a cylindrical shape is disposed inside the connector exterior member 420, and a cylindrical reinforcing member made of resin is formed on the outer periphery on the distal end side of the second connector terminal portion 435. 439 is disposed. The base end side of the second connector terminal fitting 435 is embedded in the connector exterior member 420 and is electrically connected to the second lead wire 445 taken out from the inside of the connector. In addition, the sensor connector terminal portion (second connector terminal portion) 437 located on the distal end side of the second connector terminal fitting 435 protrudes radially inward. The sensor connector terminal portion 437 is inserted through the sensor terminal connection portion 375 having a ring shape in the sensor terminal member 371 of the glow plug 300 with the combustion pressure detection function, and the sensor terminal connection portion 375 is inserted in the axial direction. They can be contacted and electrically connected in an orthogonal direction. Further, the sensor connector terminal portion 437 and the sensor terminal connection portion 375 can be pressed in any direction around the axis.

このような構成とすることで、コネクタ４１０を燃焼圧検知機能付きグロープラグ３００に装着する際に、コネクタ４１０を径方向に関していずれの向きに取り付けても、中軸用コネクタ端子部４３２と中軸端子部３５５の中間部３５５ｔとを接続できると共に、センサ用コネクタ端子部４３７とセンサ端子接続部３７５とを接続できる。このようにコネクタ４１０の径方向における取付方向性を無くすことができるので、コネクタ４１０の装着をより容易に行うことができる。また、コネクタ４１０を装着した後に、コネクタ４１０が径方向に回転しても、中軸用コネクタ端子部４３２と中軸端子部３５５の中間部３５５ｔとの接続、及び、センサ用コネクタ端子部４３７とセンサ端子接続部３７５との接続を確実に維持できる。   With this configuration, when the connector 410 is attached to the glow plug 300 with the combustion pressure detecting function, the connector terminal portion 432 for the middle shaft and the middle shaft terminal portion can be attached regardless of the radial direction of the connector 410. The intermediate portion 355t of 355 can be connected, and the sensor connector terminal portion 437 and the sensor terminal connection portion 375 can be connected. Thus, since the mounting directionality in the radial direction of the connector 410 can be eliminated, the connector 410 can be mounted more easily. Even if the connector 410 is rotated in the radial direction after the connector 410 is mounted, the connection between the middle shaft connector terminal portion 432 and the intermediate portion 355t of the middle shaft terminal portion 355, and the sensor connector terminal portion 437 and the sensor terminal are connected. The connection with the connection part 375 can be reliably maintained.

このようなコネクタ４１０を、基端側から燃焼圧検知機能付きグロープラグ３００に装着することで、図１０に示すグロープラグ接続構造体４００が構成される。この状態で、中軸用コネクタ端子部４３２に、燃焼圧検知機能付きグロープラグ３００の中軸端子部３５５が挿通して、その中間部３５５ｔと中軸用コネクタ端子部４３２とが軸線方向と直交する方向で圧接して電気的に接続している。また、センサ用コネクタ端子部４３７に、燃焼圧検知機能付きグロープラグ３００のセンサ端子部材３７１のセンサ端子接続部３７５が挿通して、これらが軸線方向と直交する方向で圧接して電気的に接続している。   By attaching such a connector 410 to the glow plug 300 with the combustion pressure detection function from the base end side, the glow plug connection structure 400 shown in FIG. 10 is configured. In this state, the middle shaft terminal portion 355 of the glow plug 300 with the combustion pressure detection function is inserted into the middle shaft connector terminal portion 432, and the intermediate portion 355t and the middle shaft connector terminal portion 432 are perpendicular to the axial direction. It is pressed and electrically connected. Further, the sensor terminal connecting portion 375 of the sensor terminal member 371 of the glow plug 300 with the combustion pressure detecting function is inserted into the sensor connector terminal portion 437, and these are pressed and electrically connected in a direction orthogonal to the axial direction. is doing.

このグロープラグ接続構造体４００でも、従来においてセンサ部３６０からのセンサ出力信号を外部へ導くために利用していたケーブルを無くすことができる。また、コネクタ４１０を基端側から装着すればグロープラグ接続構造体４００を構成できるので、グロープラグ接続構造体４００が容易にできる。加えて、コネクタ４１０を軸線方向基端側に装着してあるので、使用時には内燃機関の振動に同調してコネクタ４１０も軸線方向に振動する。このため、センサ出力信号に歪みが生じにくく、内燃機関の燃焼圧をより正確に検知できる。   Even in this glow plug connection structure 400, it is possible to eliminate a cable that has been used to guide a sensor output signal from the sensor unit 360 to the outside. Further, if the connector 410 is attached from the base end side, the glow plug connection structure 400 can be configured, so that the glow plug connection structure 400 can be easily made. In addition, since the connector 410 is mounted on the base end side in the axial direction, the connector 410 vibrates in the axial direction in synchronization with the vibration of the internal combustion engine when in use. For this reason, the sensor output signal is hardly distorted, and the combustion pressure of the internal combustion engine can be detected more accurately.

また、本実施形態では、中軸端子部３５５の中間部３５５ｔと中軸用コネクタ端子部４３２とは、軸線方向と直交する方向に圧接している。このため、使用時に、軸線方向の振動により中間部３５５ｔと中軸用コネクタ端子部４３２とが軸線方向に相対的に移動しても、中間部３５５ｔと中軸用コネクタ端子部４３２とが圧接した状態を確実に維持できる。また、センサ端子接続部３７５とセンサ用コネクタ端子部４３７も、軸線方向と直交する方向において圧接している。このため、使用時に、軸線方向の振動によりセンサ端子接続部３７５とセンサ用コネクタ端子部４３７とが軸線方向に相対的に移動しても、センサ接続端子部３７５とセンサ用コネクタ端子部４３７が圧接した状態を確実に維持できる。従って、使用時にコネクタ４１０との接続が断続してセンサ出力信号にノイズが生じることを抑制でき、従来よりも正確に内燃機関の燃焼圧を検知できる。その他、上記参考形態と同様な部分は、上記参考形態と同様な作用効果を奏する。 In the present embodiment , the intermediate portion 355t of the middle shaft terminal portion 355 and the middle shaft connector terminal portion 432 are in pressure contact with each other in a direction orthogonal to the axial direction. For this reason, even when the intermediate portion 355t and the middle-axis connector terminal portion 432 move relatively in the axial direction due to vibration in the axial direction, the intermediate portion 355t and the middle-axis connector terminal portion 432 are in pressure contact with each other. Can be reliably maintained. Further, the sensor terminal connecting portion 375 and the sensor connector terminal portion 437 are also in pressure contact in a direction orthogonal to the axial direction. Therefore, during use, even if the sensor terminal connection portion 375 and the sensor connector terminal portion 437 move relatively in the axial direction due to vibration in the axial direction, the sensor connection terminal portion 375 and the sensor connector terminal portion 437 are pressed against each other. Can be reliably maintained. Therefore, it is possible to suppress the occurrence of noise in the sensor output signal due to intermittent connection with the connector 410 during use, and the combustion pressure of the internal combustion engine can be detected more accurately than in the past. Other, similar parts as the reference embodiment exhibits the same effects as the above Reference Embodiment.

次いで、燃焼圧検知機能付きグロープラグ３００の製造方法について説明する。
まず、上記参考形態と概略同様にして、センサキャップ３３１を固定したグロープラグ中間体を作成する。その後、図１１に示すように、センサキャップ３３１上に樹脂成形体３８１を配置する。また、中軸本体３４１の基端に中軸端子部３５５をねじ込み、更に加締め固定する。 Next, a method for manufacturing the glow plug 300 with a combustion pressure detection function will be described.
First, a glow plug intermediate body to which the sensor cap 331 is fixed is produced in the same manner as in the above reference embodiment . Thereafter, as shown in FIG. 11, the resin molded body 381 is disposed on the sensor cap 331. Further, the middle shaft terminal portion 355 is screwed into the proximal end of the middle shaft main body 341 and further fixed by caulking.

次に、図１２に示すように、センサ端子接続部３７５を樹脂成形体３８１の外周に基端側から被せる。その後、センサ端子リード部３７４を折り曲げ、更にセンサ端子接続部３７５に溶接接続する。   Next, as shown in FIG. 12, the sensor terminal connection portion 375 is put on the outer periphery of the resin molded body 381 from the base end side. Thereafter, the sensor terminal lead part 374 is bent and further connected to the sensor terminal connection part 375 by welding.

次に、包囲部材３９０を基端側から被せ、ハウジング３２０に溶接固定する。その後、包囲部材３９０内にゴムを注入して、封止部材３６５を形成する。かくして、燃焼圧検知機能付きグロープラグ３００が完成する。なお、本実施形態のコネクタ４１０も、公知の手法により製造すればよい。 Next, the surrounding member 390 is covered from the base end side and fixed to the housing 320 by welding. Thereafter, the sealing member 365 is formed by injecting rubber into the surrounding member 390. Thus, the glow plug 300 with the combustion pressure detection function is completed. The connector 410 of this embodiment may be manufactured by a known method.

以上において、本発明を実施形態に即して説明したが、本発明は上述の実施形態に限定されるものではなく、その要旨を逸脱しない範囲で、適宜変更して適用できることはいうまでもない。 In the above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof. .

参考形態に係る燃焼圧検知機能付きグロープラグの部分半断面図である。It is a partial half sectional view of a glow plug with a combustion pressure detection function according to a reference form . 参考形態に係る燃焼圧検知機能付きグロープラグのうち、先端側を示す拡大断面図である。It is an expanded sectional view showing the tip side among glow plugs with a combustion pressure detection function concerning a reference form . 参考形態に係る燃焼圧検知機能付きグロープラグのうち、基端側を示す拡大断面図である。It is an expanded sectional view showing a base end side among glow plugs with a combustion pressure detection function concerning a reference form . 参考形態に係るグロープラグ接続構造体のうち、基端側を示す拡大断面図である。It is an expanded sectional view showing the base end side among glow plug connection structures concerning a reference form . 参考形態に係る燃焼圧検知機能付きグロープラグの製造方法に関し、グロープラグ中間体にセンサ部等を構成する各部品を配置した様子を示す説明図である。It is explanatory drawing which shows a mode that each component which comprises a sensor part etc. is arrange | positioned in the glow plug intermediate body regarding the manufacturing method of the glow plug with a combustion pressure detection function which concerns on a reference form . 参考形態に係る燃焼圧検知機能付きグロープラグの製造方法に関し、中軸端子部とセンサ端子接続部を取り付けた様子を示す説明図である。It is explanatory drawing which shows a mode that the center axis | shaft terminal part and the sensor terminal connection part were attached regarding the manufacturing method of the glow plug with a combustion pressure detection function which concerns on a reference form . 実施形態に係る燃焼圧検知機能付きグロープラグの部分半断面図である。It is a partial half sectional view of a glow plug with a combustion pressure detection function concerning an embodiment . 実施形態に係る燃焼圧検知機能付きグロープラグのうち、先端側を示す拡大断面図である。It is an expanded sectional view showing the tip side among glow plugs with a combustion pressure detection function concerning an embodiment . 実施形態に係る燃焼圧検知機能付きグロープラグのうち、基端側を示す拡大断面図である。It is an expanded sectional view showing the base end side among glow plugs with a combustion pressure detection function concerning an embodiment . 実施形態に係るグロープラグ接続構造体のうち、基端側を示す拡大断面図である。It is an expanded sectional view showing the base end side among glow plug connection structures concerning an embodiment . 実施形態に係る燃焼圧検知機能付きグロープラグの製造方法に関し、グロープラグ中間体にセンサ部等を構成する各部品を配置した様子を示す説明図である。It is explanatory drawing which shows a mode that each component which comprises a sensor part etc. is arrange | positioned in the glow plug intermediate body regarding the manufacturing method of the glow plug with a combustion pressure detection function which concerns on embodiment . 実施形態に係る燃焼圧検知機能付きグロープラグの製造方法に関し、センサ端子接続部を取り付けた様子を示す説明図である。It is explanatory drawing which shows a mode that the sensor terminal connection part was attached regarding the manufacturing method of the glow plug with a combustion pressure detection function which concerns on embodiment .

符号の説明Explanation of symbols

１００，３００ 燃焼圧検知機能付きグロープラグ
１１０，３１０ ヒータ部材
１１２，３１２ 第２ヒータ端子部
１１３，３１３ 第１ヒータ端子部
１２０，３２０ ハウジング
１２１，３２１ ハウジング本体
１２６，３２６ ヒータ保持部材
１３１，３３１ センサキャップ
１４０，３４０ 中軸
１４１，３４１ 中軸本体
１５１，３５１ 中軸スリーブ
１５５，３５５ 中軸端子部
１５７ 中軸端子接続部
３５５ｔ 中間部（中軸端子接続部）
１６０，３６０ センサ部
１６１，３６１ 押圧金具（第２センサ端子部）
１６２，３６２ 圧電素子
１７１，３７１ センサ端子部材（第１センサ端子部）
１７５，３７５ センサ端子接続部
１９０，３９０ 包囲部材
２００，４００ グロープラグ接続構造体
２１０，４１０ コネクタ（第１コネクタ及び第２コネクタ）
２２０，４２０ コネクタ外装部材
２３０，４３０ 第１コネクタ端子金具
２３２，４３２ 中軸用コネクタ端子部（第１コネクタ端子部）
２３５，４３５ 第２コネクタ端子金具
２３７，４３７ センサ用コネクタ端子部（第２コネクタ端子部）
ＡＸ 軸線

100, 300 Glow plug 110, 310 with combustion pressure detection function Heater members 112, 312 Second heater terminal portion 113, 313 First heater terminal portion 120, 320 Housing 121, 321 Housing body 126, 326 Heater holding member 131, 331 Sensor Caps 140 and 340 Middle shafts 141 and 341 Middle shaft main bodies 151 and 351 Middle shaft sleeves 155 and 355 Middle shaft terminal portion 157 Middle shaft terminal connection portion 355t Intermediate portion (middle shaft terminal connection portion)
160, 360 Sensor part 161, 361 Press fitting (second sensor terminal part)
162,362 Piezoelectric elements 171,371 Sensor terminal member (first sensor terminal)
175,375 Sensor terminal connection portion 190,390 Enclosing member 200,400 Glow plug connection structure 210,410 Connector (first connector and second connector)
220, 420 Connector exterior member 230, 430 First connector terminal fitting 232, 432 Middle shaft connector terminal (first connector terminal)
235, 435 Second connector terminal fittings 237, 437 Sensor connector terminal (second connector terminal)
AX axis

Claims (8)

筒状のハウジングと、
前記ハウジングに自身の軸線方向基端側が挿通されてなり、第１ヒータ端子部及び第２ヒータ端子部を有し、これら第１ヒータ端子部と第２ヒータ端子部との間に通電することにより昇温するヒータ部材と、
前記ハウジングに挿通されてなり、自身の軸線方向基端側に中軸端子部を有し、前記ヒータ部材の前記第１ヒータ端子部と電気的に接続する中軸と、
センサ出力信号を取り出す第１センサ端子部及び第２センサ端子部を有し、内燃機関の燃焼圧の変化を検知するセンサ部と、
を備える燃焼圧検知機能付きグロープラグであって、
前記中軸端子部は、軸線方向基端側から軸線方向に沿って装着する第１コネクタに配設された第１コネクタ端子部と電気的に接続可能な形態とされてなる中軸端子接続部を有し、
前記中軸端子接続部は、前記第１コネクタ端子部と軸線周りのいずれの方位についてでも圧接可能な形態とされてなり、
前記第１センサ端子部は、軸線方向基端側から軸線方向に沿って装着し、前記第１コネクタと一体とされてなる第２コネクタに配設された第２コネクタ端子部と電気的に接続可能な形態とされてなるセンサ端子接続部を有し、
前記センサ端子接続部は、前記第２コネクタ端子部と軸線周りのいずれの方位についてでも圧接可能な形態とされてなる
燃焼圧検知機能付きグロープラグ。 A tubular housing;
The housing is inserted into the housing at its proximal end in the axial direction, has a first heater terminal portion and a second heater terminal portion, and is energized between the first heater terminal portion and the second heater terminal portion. A heater member for raising the temperature;
A middle shaft that is inserted through the housing, has a middle shaft terminal portion on its proximal side in the axial direction, and is electrically connected to the first heater terminal portion of the heater member;
Have a first sensor terminal portions and the second sensor terminal portions to take out the sensor output signal, a sensor unit for detecting a change in the combustion pressure of the internal combustion engine,
A glow plug with a combustion pressure detection function comprising:
The middle shaft terminal portion has a middle shaft terminal connection portion configured to be electrically connected to a first connector terminal portion disposed on a first connector mounted along the axial direction from the axial base end side. And
The middle shaft terminal connecting portion is configured to be able to press contact with the first connector terminal portion in any direction around the axis,
The first sensor terminal portion is mounted along the axial direction from the base end side in the axial direction, and is electrically connected to a second connector terminal portion disposed on a second connector integrated with the first connector. is a possible embodiment have a sensor terminal connector comprising,
The glow plug with a combustion pressure detecting function , wherein the sensor terminal connecting portion is configured to be press-contactable with the second connector terminal portion in any direction around the axis . 請求項１に記載の燃焼圧検知機能付きグロープラグであって、
前記中軸端子接続部は、前記第１コネクタ端子部と軸線に直交する平面に沿う方向に圧接可能な形態とされてなり、
前記センサ端子接続部は、前記第２コネクタ端子部と軸線に直交する平面に沿う方向に圧接可能な形態とされてなる
燃焼圧検知機能付きグロープラグ。 A glow plug with a combustion pressure detection function according to claim 1,
The middle shaft terminal connecting portion is configured to be press-contactable in a direction along a plane perpendicular to the first connector terminal portion and the axis,
The glow plug with a combustion pressure detecting function, wherein the sensor terminal connecting portion is configured to be press-contactable with the second connector terminal portion in a direction along a plane perpendicular to the axis. 請求項１または請求項２に記載の燃焼圧検知機能付きグロープラグであって、
前記中軸端子接続部及び前記センサ端子接続部は、径方向に見て、それぞれ前記ハウジングの基端外周よりも内側に配置されてなる
燃焼圧検知機能付きグロープラグ。 A glow plug with a combustion pressure detection function according to claim 1 or 2,
The glow plug with a combustion pressure detecting function, wherein the center shaft terminal connecting portion and the sensor terminal connecting portion are arranged inside the outer periphery of the base end of the housing as viewed in the radial direction. 請求項１〜請求項３のいずれか一項に記載の燃焼圧検知機能付きグロープラグであって、
前記第２ヒータ端子部及び前記第２センサ端子部は、いずれも前記ハウジングに電気的に接続してなる
燃焼圧検知機能付きグロープラグ。 A glow plug with a combustion pressure detection function according to any one of claims 1 to 3,
The second heater terminal portion and the second sensor terminal portion are glow plugs with a combustion pressure detecting function, both of which are electrically connected to the housing. 燃焼圧検知機能付きグロープラグにコネクタが装着されたグロープラグ接続構造体であって、
筒状のハウジング、
前記ハウジングに自身の軸線方向基端側が挿通されてなり、第１ヒータ端子部及び第２ヒータ端子部を有し、これら第１ヒータ端子部と第２ヒータ端子部との間に通電することにより昇温するヒータ部材、
前記ハウジングに挿通されてなり、自身の軸線方向基端側に中軸端子部を有し、前記ヒータ部材の前記第１ヒータ端子部と電気的に接続する中軸であって、前記中軸端子部が、外部に露出する中軸端子接続部を有する中軸、並びに、
センサ出力信号を取り出す第１センサ端子部及び第２センサ端子部を有し、内燃機関の燃焼圧の変化を検知するセンサ部であって、前記第１センサ端子部が、外部に露出するセンサ端子接続部を有するセンサ部、
を備える燃焼圧検知機能付きグロープラグと、
前記燃焼圧検知機能付きグロープラグの軸線方向基端側から軸線方向に沿って装着された第１コネクタであって、前記中軸端子接続部と電気的に接続した第１コネクタ端子部を有する第１コネクタと、
前記燃焼圧検知機能付きグロープラグの軸線方向基端側から軸線方向に沿って装着され、前記第１コネクタと一体とされてなる第２コネクタであって、前記センサ端子接続部と電気的に接続した第２コネクタ端子部を有する第２コネクタと、を備え、
前記中軸端子接続部と前記第１コネクタ端子部とは、軸線周りのいずれの方位についてでも互いに圧接可能な状態で、互いに圧接してなり、
前記センサ端子接続部と前記第２コネクタ端子部とは、軸軸線周りのいずれの方位についてでも互いに圧接可能な状態で、互いに圧接してなる
グロープラグ接続構造体。 A glow plug connection structure in which a connector is attached to a glow plug with a combustion pressure detection function,
Cylindrical housing,
The housing is inserted in the axial direction proximal end side, has a first heater terminal portion and a second heater terminal portion, and is energized between the first heater terminal portion and the second heater terminal portion. A heater member for raising the temperature;
It is inserted through the housing, has a middle shaft terminal portion on its axial base end side, and is a middle shaft that is electrically connected to the first heater terminal portion of the heater member, and the middle shaft terminal portion is A middle shaft having a middle shaft terminal connection exposed to the outside, and
It has a first sensor terminal portions and the second sensor terminal portions to take out the sensor output signal, sensor terminal a sensor unit for detecting a change in the combustion pressure of an internal combustion engine, wherein the first sensor terminal portion is exposed to the outside A sensor part having a connection part,
A glow plug with a combustion pressure detection function comprising:
A first connector mounted along the axial direction from the axial base end side of the glow plug with combustion pressure detecting function, the first connector having a first connector terminal portion electrically connected to the middle shaft terminal connecting portion. A connector;
A second connector that is mounted along the axial direction from the base end side in the axial direction of the glow plug with a combustion pressure detecting function, and is integrated with the first connector, and is electrically connected to the sensor terminal connecting portion. e Bei and a second connector having a second connector terminal portions connected,
The intermediate shaft terminal connection portion and the first connector terminal portion are in pressure contact with each other in a state where they can be pressed against each other in any direction around the axis,
The glow plug connection structure, wherein the sensor terminal connection portion and the second connector terminal portion are in pressure contact with each other in a state in which the sensor terminal connection portion and the second connector terminal portion are in pressure contact with each other in any direction around the axis . 請求項５に記載のグロープラグ接続構造体であって、
前記中軸端子接続部と前記第１コネクタ端子部とは、軸線に直交する平面に沿う方向に圧接してなり、
前記センサ端子接続部と前記第２コネクタ端子部とは、軸線に直交する平面に沿う方向に圧接してなる
グロープラグ接続構造体。 The glow plug connection structure according to claim 5 ,
The middle shaft terminal connecting portion and the first connector terminal portion are pressed in a direction along a plane perpendicular to the axis,
The glow plug connection structure in which the sensor terminal connection portion and the second connector terminal portion are press-contacted in a direction along a plane orthogonal to the axis. 請求項５または請求項６に記載のグロープラグ接続構造体であって、
前記中軸端子接続部及び前記センサ端子接続部は、径方向に見て、それぞれ前記ハウジングの基端外周よりも内側に配置されてなる
グロープラグ接続構造体。 The glow plug connection structure according to claim 5 or 6 ,
The glow plug connection structure in which the central shaft terminal connection portion and the sensor terminal connection portion are disposed inside the outer periphery of the base end of the housing as viewed in the radial direction. 請求項５〜請求項７のいずれか一項に記載のグロープラグ接続構造体であって、
前記第２ヒータ端子部及び前記第２センサ端子部は、いずれも前記ハウジングに電気的に接続してなる
グロープラグ接続構造体。 The glow plug connection structure according to any one of claims 5 to 7 ,
The second heater terminal portion and the second sensor terminal portion are both glow plug connection structures that are electrically connected to the housing.
JP2005102457A 2005-03-31 2005-03-31 Glow plug with combustion pressure detection mechanism and glow plug connection structure Expired - Fee Related JP4268596B2 (en)

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