JP2016133071A - Fuel injection valve with cylinder pressure sensor - Google Patents

Fuel injection valve with cylinder pressure sensor Download PDF

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Publication number
JP2016133071A
JP2016133071A JP2015008440A JP2015008440A JP2016133071A JP 2016133071 A JP2016133071 A JP 2016133071A JP 2015008440 A JP2015008440 A JP 2015008440A JP 2015008440 A JP2015008440 A JP 2015008440A JP 2016133071 A JP2016133071 A JP 2016133071A
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Prior art keywords
signal transmission
fuel injection
transmission member
injection valve
cylinder pressure
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岳 佐藤
Gaku Sato
佐藤　　岳
啓介 町田
Keisuke Machida
啓介 町田
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Keihin Corp
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Keihin Corp
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Priority to JP2015008440A priority Critical patent/JP2016133071A/en
Priority to DE102016200573.1A priority patent/DE102016200573A1/en
Publication of JP2016133071A publication Critical patent/JP2016133071A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/005—Fuel-injectors combined or associated with other devices the devices being sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
    • G01L23/10—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by pressure-sensitive members of the piezoelectric type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/247—Pressure sensors

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Measuring Fluid Pressure (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a fuel injection valve with a cylinder pressure sensor for reliably preventing the occurrence of disconnection by preventing the rattling of a signal transmission member.SOLUTION: A signal transmission part 24 constituting a fuel injection valve 10 has a plurality of first protruded portions 70 on the outer periphery side of a first signal transmission member 58 connected to a sensor 20, and a second flange 68 of the first signal transmission member 58 has second protruded portions 72 protruded toward the front end side. When a cover member 74 is mounted on the outer periphery side of the first signal transmission member 58, the first protruded portions 70 abut on the inner peripheral face of a first cover 76 and the second protruded portions 72 abut on the inner face of a second cover 78 to restrict the radial and axial movement of the first signal transmission member 58 relative to the cover member 74. This reliably prevents the disconnection of the signal transmission part 24 including the first signal transmission member 58.SELECTED DRAWING: Figure 2

Description

本発明は、内燃機関における燃焼室に直接噴射する直噴式の内燃機関に用いられ、前記燃焼室内の筒内圧を検出可能なセンサを有した筒内圧センサ付き燃料噴射弁に関する。   The present invention relates to a fuel injection valve with an in-cylinder pressure sensor that is used in a direct injection type internal combustion engine that directly injects into a combustion chamber of the internal combustion engine and has a sensor capable of detecting the in-cylinder pressure in the combustion chamber.

従来から、内燃機関における燃焼室の筒内圧を検出する目的で、燃料噴射弁の先端に内圧センサを装着したものが知られている。この内圧センサは、燃料噴射弁の先端と内燃機関を構成するシリンダヘッドの取付孔との間に配置され、該内圧センサには、検出した筒内圧を出力信号として外部へ伝達するためにリード線が接続されている。そして、このリード線が、例えば、電子制御ユニットに接続され、筒内圧が出力信号として前記電子制御ユニットに出力されることにより前記筒内圧に基づいた制御等が行われる（例えば、特許文献１参照）。   2. Description of the Related Art Conventionally, an internal pressure sensor is known at the tip of a fuel injection valve for the purpose of detecting the in-cylinder pressure of a combustion chamber in an internal combustion engine. This internal pressure sensor is disposed between the tip of the fuel injection valve and the mounting hole of the cylinder head constituting the internal combustion engine. The internal pressure sensor has a lead wire for transmitting the detected in-cylinder pressure as an output signal to the outside. Is connected. The lead wire is connected to, for example, an electronic control unit, and the in-cylinder pressure is output to the electronic control unit as an output signal, whereby control based on the in-cylinder pressure is performed (see, for example, Patent Document 1). ).

特開平９−５３４８３号公報JP-A-9-53483

しかしながら、上述した燃料噴射弁に装着される内圧センサでは、該内圧センサと電子制御ユニットとを接続しているリード線が燃料噴射弁の外部に露出している。そのため、例えば、内圧センサを燃料噴射弁と共にシリンダヘッドへ組み付ける際や組み付け状態において、前記リード線に対して負荷がかかることで断線してしまう恐れがあり、該断線によって筒内圧を検出できないことが懸念される。   However, in the internal pressure sensor attached to the fuel injection valve described above, the lead wire connecting the internal pressure sensor and the electronic control unit is exposed to the outside of the fuel injection valve. Therefore, for example, when the internal pressure sensor is assembled to the cylinder head together with the fuel injection valve or in the assembled state, there is a risk of disconnection due to a load applied to the lead wire, and the in-cylinder pressure cannot be detected due to the disconnection. Concerned.

また、内燃機関の振動等によって内圧センサとリード線との間で断線が起こりやすいという問題がある。   Further, there is a problem that disconnection is likely to occur between the internal pressure sensor and the lead wire due to vibration of the internal combustion engine or the like.

本発明は、前記の課題を考慮してなされたものであり、信号伝達部材のがたつきを防止することで断線等の発生を確実に防止することが可能な筒内圧センサ付き燃料噴射弁を提供することを目的とする。   The present invention has been made in consideration of the above-described problems, and provides a fuel injection valve with an in-cylinder pressure sensor that can reliably prevent occurrence of disconnection or the like by preventing rattling of a signal transmission member. The purpose is to provide.

前記の目的を達成するために、本発明は、内燃機関の燃焼室に対して燃料を直接噴射する燃料噴射弁の端部に燃焼室内の筒内圧を検出するセンサを有した筒内圧センサ付き燃料噴射弁において、
センサに接続され筒内圧に基づいた検出信号を伝達する信号伝達部材と、
信号伝達部材の外側を覆うカバー部材と、
を備え、
信号伝達部材には、カバー部材に当接する突起部を備えることを特徴とする。 In order to achieve the above object, the present invention provides a fuel with an in-cylinder pressure sensor having a sensor for detecting the in-cylinder pressure in the combustion chamber at the end of a fuel injection valve that directly injects fuel into the combustion chamber of the internal combustion engine. In the injection valve,
A signal transmission member that is connected to the sensor and transmits a detection signal based on the in-cylinder pressure;
A cover member covering the outside of the signal transmission member;
With
The signal transmission member is provided with a protrusion that contacts the cover member.

本発明によれば、センサを端部に有した筒内圧センサ付き燃料噴射弁において、筒内圧に基づいたセンサからの検出信号を伝達する信号伝達部材を有し、この信号伝達部材には、その外側を覆うカバー部材の当接する突起部が設けられている。   According to the present invention, a fuel injection valve with an in-cylinder pressure sensor having a sensor at an end includes a signal transmission member that transmits a detection signal from the sensor based on the in-cylinder pressure. Protruding portions that contact the cover member that covers the outside are provided.

従って、信号伝達部材の外側を覆うようにカバー部材を装着する際、突起部がカバー部材に当接することで、カバー部材が保持され信号伝達部材との相対的な移動が規制される。その結果、内燃機関の振動等によってカバー部材に対して信号伝達部材が所定の位置からずれてしまうことが防止され、該信号伝達部材の位置ずれに起因した断線等を確実に防止することができる。   Therefore, when the cover member is mounted so as to cover the outside of the signal transmission member, the protrusion comes into contact with the cover member, whereby the cover member is held and relative movement with the signal transmission member is restricted. As a result, it is possible to prevent the signal transmission member from being displaced from a predetermined position with respect to the cover member due to vibration of the internal combustion engine or the like, and it is possible to reliably prevent disconnection or the like due to the position displacement of the signal transmission member. .

また、信号伝達部材は、検出信号を出力する導電層を樹脂製材料によって封止した封止体からなり、突起部を封止体と一体的に形成することにより、封止体を樹脂製材料から成形する際に突起部を同時に形成することができるため、製造工数並びに製造コストの増加を招くことがなく好適である。   The signal transmission member includes a sealing body in which a conductive layer that outputs a detection signal is sealed with a resin material, and the projecting portion is formed integrally with the sealing body so that the sealing body is made of the resin material. Since the protrusions can be formed at the same time as molding from the above, it is preferable without increasing the number of manufacturing steps and the manufacturing cost.

さらに、突起部を、信号伝達部材の径方向外側に突出するように形成することで、カバー部材に対する信号伝達部材の径方向外側への相対変位を突起部によって防止することができる。   Furthermore, by forming the protrusion so as to protrude outward in the radial direction of the signal transmission member, the protrusion can prevent relative displacement of the signal transmission member in the radial direction of the cover member.

さらにまた、突起部を、信号伝達部材の軸方向に突出するように形成することで、カバー部材に対する信号伝達部材の軸方向への相対変位を突起部によって防止することができる。   Furthermore, by forming the protrusion so as to protrude in the axial direction of the signal transmission member, relative displacement in the axial direction of the signal transmission member with respect to the cover member can be prevented by the protrusion.

またさらに、カバー部材を金属製材料から形成することにより、信号伝達部材の外周側にカバー部材を装着する際、樹脂製材料からなる突起部を好適に押し潰しながら装着できるため、カバー部材と突起部とをより密着させ信号伝達部材の位置ずれをより確実に防止することが可能となる。   Furthermore, since the cover member is formed of a metal material, when the cover member is mounted on the outer peripheral side of the signal transmission member, the protrusion made of the resin material can be mounted while being suitably crushed. This makes it possible to more reliably prevent the signal transmission member from being displaced.

本発明によれば、以下の効果が得られる。   According to the present invention, the following effects can be obtained.

すなわち、センサを端部に有した筒内圧センサ付き燃料噴射弁において、筒内圧に基づいたセンサからの検出信号を伝達する信号伝達部材を有し、この信号伝達部材に、その外側を覆うカバー部材の当接する突起部を設けることにより、信号伝達部材の外側にカバー部材を装着する際、突起部がカバー部材に当接することで、カバー部材に対する信号伝達部材の相対的な移動が規制される。その結果、内燃機関の振動等によって信号伝達部材がカバー部材に対して所定の位置からずれてしまうことが防止され、該信号伝達部材の位置ずれに起因した断線等を確実に阻止することが可能となる。   That is, a fuel injection valve with an in-cylinder pressure sensor having a sensor at an end portion has a signal transmission member that transmits a detection signal from the sensor based on the in-cylinder pressure, and the cover member that covers the outside of the signal transmission member When the cover member is mounted on the outside of the signal transmission member, the relative movement of the signal transmission member with respect to the cover member is restricted by the projection portion coming into contact with the cover member. As a result, it is possible to prevent the signal transmission member from being displaced from a predetermined position with respect to the cover member due to vibration of the internal combustion engine or the like, and it is possible to reliably prevent disconnection or the like due to the position displacement of the signal transmission member. It becomes.

本発明の実施の形態に係る筒内圧センサ付き燃料噴射弁の一部断面全体正面図である。It is a partial cross section front view of the fuel injection valve with a cylinder pressure sensor which concerns on embodiment of this invention. 図１の筒内圧センサ付き燃料噴射弁における第１信号伝達部材の第２フランジ部近傍を示す拡大断面図である。It is an expanded sectional view which shows the 2nd flange part vicinity of the 1st signal transmission member in the fuel injection valve with a cylinder pressure sensor of FIG. 図１の筒内圧センサ付き燃料噴射弁を構成する第１信号伝達部材の外観斜視図である。It is an external appearance perspective view of the 1st signal transmission member which comprises the fuel injection valve with a cylinder pressure sensor of FIG. 図１のＩＶ−ＩＶ線に沿った断面図である。It is sectional drawing along the IV-IV line of FIG.

本発明に係る筒内圧センサ付き燃料噴射弁について好適な実施の形態を挙げ、添付の図面を参照しながら以下詳細に説明する。図１において、参照符号１０は、本発明の実施の形態に係る筒内圧センサ付き燃料噴射弁を示す。   The fuel injection valve with an in-cylinder pressure sensor according to the present invention will be described in detail below with reference to the accompanying drawings by giving preferred embodiments. In FIG. 1, reference numeral 10 indicates a fuel injection valve with an in-cylinder pressure sensor according to an embodiment of the present invention.

この筒内圧センサ付き燃料噴射弁１０（以下、単に燃料噴射弁１０という）は、図１に示されるように、ハウジング１２と、該ハウジング１２の外周側に設けられる樹脂モールド部１４と、該ハウジング１２の基端に設けられ燃料の供給される燃料供給部１６と、該ハウジング１２の先端に設けられる燃料噴射部１８と、前記燃料噴射部１８の先端に装着されるセンサ２０と、図示しない電子制御ユニット（ＥＣＵ）に接続された信号端子２２と前記センサ２０とを電気的に接続して検出信号を伝達する信号伝達部２４とを含む。   As shown in FIG. 1, a fuel injection valve 10 with a cylinder pressure sensor (hereinafter simply referred to as a fuel injection valve 10) includes a housing 12, a resin mold portion 14 provided on the outer peripheral side of the housing 12, and the housing. 12, a fuel supply unit 16 that is supplied with fuel, a fuel injection unit 18 that is provided at the front end of the housing 12, a sensor 20 that is attached to the front end of the fuel injection unit 18, and an electronic device (not shown). A signal transmission unit 24 that electrically connects a signal terminal 22 connected to a control unit (ECU) and the sensor 20 to transmit a detection signal is included.

なお、以下、燃料噴射弁１０における燃料供給部１６側を基端側（矢印Ａ方向）、燃料噴射部１８側を先端側（矢印Ｂ方向）として説明する。   Hereinafter, the fuel supply unit 16 side of the fuel injection valve 10 will be described as the base end side (arrow A direction), and the fuel injection unit 18 side will be described as the front end side (arrow B direction).

ハウジング１２は、例えば、燃料噴射弁１０を駆動させるソレノイド部として構成され、その中心に設けられる固定コア２６と、該固定コア２６の外周側に設けられコイル２８を保持するボビン３０と、前記ボビン３０のさらに先端外周側に設けられる円筒状のホルダ３２と、前記コイル２８の励磁作用下に変位する可動コア（図示せず）とを有している。   The housing 12 is configured as, for example, a solenoid unit that drives the fuel injection valve 10, and includes a fixed core 26 provided at the center thereof, a bobbin 30 provided on the outer peripheral side of the fixed core 26 and holding a coil 28, and the bobbin. 30 has a cylindrical holder 32 provided on the outer peripheral side of the tip, and a movable core (not shown) that is displaced under the exciting action of the coil 28.

固定コア２６は、ホルダ３２の基端に対してさらにハウジング１２の基端側（矢印Ａ方向）へと延在し、後述する樹脂モールド部１４の中心に配置されると共に、その外周面には後述する樹脂モールド部１４の係合される環状の第１溝部３４が形成される。また、固定コア２６の基端側には燃料供給部１６が設けられている。   The fixed core 26 further extends toward the base end side (arrow A direction) of the housing 12 with respect to the base end of the holder 32, and is disposed at the center of the resin mold portion 14 to be described later. An annular first groove portion 34 to be engaged with a resin mold portion 14 to be described later is formed. A fuel supply unit 16 is provided on the base end side of the fixed core 26.

ボビン３０は、例えば、円筒状に形成され、固定コア２６とホルダ３２の間に設けられ、その外周側には、半径内方向に窪んだ凹部にコイル２８が巻回される。   The bobbin 30 is formed in a cylindrical shape, for example, and is provided between the fixed core 26 and the holder 32, and a coil 28 is wound around a concave portion recessed radially inward on the outer peripheral side thereof.

そして、図示しないコネクタが後述するカプラ部４０へと接続されることで、駆動端子３６を通じて通電されコイル２８が励磁して磁力が生じる。これにより、コイル２８の励磁作用下に可動コアがボビン３０の内部で変位し、燃料噴射部１８に設けられた弁体（図示せず）を吸引して開弁させる。   Then, when a connector (not shown) is connected to a coupler unit 40 which will be described later, current is passed through the drive terminal 36 and the coil 28 is excited to generate magnetic force. As a result, the movable core is displaced inside the bobbin 30 under the exciting action of the coil 28, and a valve body (not shown) provided in the fuel injection unit 18 is sucked and opened.

樹脂モールド部１４は、例えば、樹脂製材料から成形によってハウジング１２の外周側に形成され、円筒状に形成された本体部３８と、該本体部３８の基端から側方に突出したカプラ部４０と、前記本体部３８とカプラ部４０とを接続する接続部４２とを有している。そして、樹脂製材料によって樹脂モールド部１４を成形することで、本体部３８の中心に設けられた固定コア２６の第１溝部３４と、該本体部３８の先端側に設けられたホルダ３２の第２溝部４３へそれぞれ溶融した樹脂製材料が入り込み、第１及び第２溝部３４、４３との係合作用下にハウジング１２が前記樹脂モールド部１４の中央及び先端に対して固定される。   The resin mold portion 14 is formed on the outer peripheral side of the housing 12 by molding from a resin material, for example, and a main body portion 38 formed in a cylindrical shape, and a coupler portion 40 protruding laterally from the base end of the main body portion 38. And a connecting portion 42 for connecting the main body portion 38 and the coupler portion 40. Then, by molding the resin mold portion 14 with a resin material, the first groove portion 34 of the fixed core 26 provided at the center of the main body portion 38 and the first of the holder 32 provided on the front end side of the main body portion 38. The melted resin material enters the two groove portions 43, respectively, and the housing 12 is fixed to the center and the front end of the resin mold portion 14 under the engaging action with the first and second groove portions 34, 43.

カプラ部４０は、例えば、本体部３８の軸方向（矢印Ａ、Ｂ方向）に対して所定角度だけ傾斜するように斜め上方に向かって突出し、その端部が開口して内部に後述する増幅部材４４の信号端子２２及び電源端子４６と、コイル２８へ通電を行うための一対の駆動端子３６とがそれぞれ露出するように設けられる。   For example, the coupler unit 40 protrudes obliquely upward so as to be inclined by a predetermined angle with respect to the axial direction (arrows A and B directions) of the main body 38, and an end of the coupler unit 40 opens to be described later. 44 signal terminals 22 and power supply terminals 46 and a pair of drive terminals 36 for energizing the coil 28 are provided so as to be exposed.

増幅部材４４は、例えば、樹脂モールド部１４の内部に設けられ、断面矩形状の基板４８と、該基板４８に対して電気的に接続された信号端子２２及び電源端子４６と、前記基板４８の全体を覆うように形成された封止部５０とを含み、センサ２０で検出された検出信号を増幅させ前記信号端子２２から外部へと出力する目的で設けられる。   For example, the amplifying member 44 is provided in the resin mold portion 14 and has a rectangular cross section 48, a signal terminal 22 and a power terminal 46 electrically connected to the substrate 48, and the substrate 48. And a sealing portion 50 formed so as to cover the whole, and is provided for the purpose of amplifying a detection signal detected by the sensor 20 and outputting the amplified signal from the signal terminal 22 to the outside.

そして、増幅部材４４は、樹脂モールド部１４を成形する際、基板４８及び封止部５０が接続部４２に対応する位置に配置され、信号端子２２及び電源端子４６がカプラ部４０に対応する位置に配置された状態で一体的にモールドされる。   In the amplification member 44, when the resin mold part 14 is molded, the substrate 48 and the sealing part 50 are arranged at positions corresponding to the connection part 42, and the signal terminal 22 and the power terminal 46 are positions corresponding to the coupler part 40. Are integrally molded in a state of being disposed on the surface.

このカプラ部４０には、図示しないコネクタが接続されることで、電源端子４６を通じてセンサ２０及び増幅部材４４へ電源が供給され、信号端子２２を通じてセンサ２０で検出された検出値が電気信号として外部へ出力されると共に、駆動端子３６からハウジング１２のコイル２８へと通電がなされる。   A connector (not shown) is connected to the coupler unit 40 so that power is supplied to the sensor 20 and the amplifying member 44 through the power terminal 46, and the detection value detected by the sensor 20 through the signal terminal 22 is externally supplied as an electrical signal. And the drive terminal 36 is energized to the coil 28 of the housing 12.

燃料供給部１６は、例えば、固定コア２６の内部に燃料の供給される供給通路（図示せず）を有し、燃料噴射弁１０の基端側（矢印Ａ方向）に開口した供給通路の端部に図示しない燃料配管が接続される。そして、燃料配管を通じて供給された燃料が供給通路を通じて先端側に設けられた燃料噴射部１８側（矢印Ｂ方向）へと供給される。   The fuel supply unit 16 has, for example, a supply passage (not shown) through which fuel is supplied into the fixed core 26, and the end of the supply passage that opens to the base end side (direction of arrow A) of the fuel injection valve 10. A fuel pipe (not shown) is connected to the section. Then, the fuel supplied through the fuel pipe is supplied to the fuel injection unit 18 side (in the direction of arrow B) provided on the tip side through the supply passage.

燃料噴射部１８は、ハウジング１２の先端に連結されるバルブハウジング５２と、該バルブハウジング５２の先端に内蔵された弁体（図示せず）とを備える。そして、バルブハウジング５２の内部には燃料供給部１６から燃料が供給され、弁体がコイル２８の励磁作用下に基端側（矢印Ａ方向）へと移動することにより、先端から燃料が所定圧力で燃焼室内へと噴射される。   The fuel injection unit 18 includes a valve housing 52 connected to the front end of the housing 12 and a valve body (not shown) built in the front end of the valve housing 52. The fuel is supplied from the fuel supply unit 16 to the inside of the valve housing 52, and the valve body moves toward the base end side (in the direction of arrow A) under the excitation action of the coil 28. Is injected into the combustion chamber.

このバルブハウジング５２は、図１及び図２に示されるように、例えば、金属製材料から形成され、ハウジング１２の先端を閉塞する第１フランジ部５４と、該第１フランジ部５４から先端側（矢印Ｂ方向）に向かって一直線上に延在する第１筒部５６とを有し、前記第１筒部５６の先端には、その外周側に円筒状のセンサ２０が圧入され嵌合される。   As shown in FIGS. 1 and 2, the valve housing 52 is formed of, for example, a metal material, and includes a first flange portion 54 that closes the distal end of the housing 12, and a distal end side (from the first flange portion 54 ( A first cylindrical portion 56 extending in a straight line in the direction of arrow B), and a cylindrical sensor 20 is press-fitted and fitted to the distal end of the first cylindrical portion 56 on the outer peripheral side thereof. .

センサ２０は、図１に示されるように、例えば、その内部に圧電素子（図示せず）を備え、該圧電素子に接続された接続端子が基端側（矢印Ａ方向）で露出している。また、センサ２０の外周面には、後述するカバー部材７４の保持部８０が当接し、センサ２０は、例えば、その先端内周側が前記バルブハウジング５２に対して全周溶接によって結合される。   As shown in FIG. 1, the sensor 20 includes, for example, a piezoelectric element (not shown) therein, and a connection terminal connected to the piezoelectric element is exposed on the base end side (in the direction of arrow A). . Further, a holding portion 80 of a cover member 74 to be described later is brought into contact with the outer peripheral surface of the sensor 20, and the sensor 20 is coupled to the valve housing 52 by, for example, all-around welding at the tip inner peripheral side.

信号伝達部２４は、図１及び図２に示されるように、バルブハウジング５２の外周側に設けられ、センサ２０に接続された第１信号伝達部材５８と、前記ハウジング１２のホルダ３２に収納され、前記第１信号伝達部材５８と信号端子２２とを接続する第２信号伝達部材６０とを含む。   As shown in FIGS. 1 and 2, the signal transmission unit 24 is provided on the outer peripheral side of the valve housing 52, and is housed in the first signal transmission member 58 connected to the sensor 20 and the holder 32 of the housing 12. And a second signal transmission member 60 for connecting the first signal transmission member 58 and the signal terminal 22.

第１信号伝達部材５８は、図１〜図３に示されるように、例えば、樹脂製材料から円筒状に形成され、バルブハウジング５２の外周側に設けられる絶縁体６２と、前記絶縁体６２の内部に設けられる第１導電層６４とを有する。そして、第１導電層６４は、例えば、半田等によってセンサ２０の接続端子（図示せず）に対して電気的に接続される。   As shown in FIGS. 1 to 3, the first signal transmission member 58 is formed, for example, in a cylindrical shape from a resin material and is provided on the outer peripheral side of the valve housing 52. And a first conductive layer 64 provided inside. The first conductive layer 64 is electrically connected to a connection terminal (not shown) of the sensor 20 by, for example, solder.

絶縁体６２は、例えば、耐熱性樹脂等の樹脂製材料から形成され、バルブハウジング５２の形状に対応して第１筒部５６を覆う第２筒部６６と、第１フランジ部５４を覆う第２フランジ部６８とを有し、前記第２フランジ部６８が前記第２筒部６６の基端側（矢印Ａ方向）に形成される。   The insulator 62 is formed of a resin material such as a heat-resistant resin, for example, and corresponds to the shape of the valve housing 52, the second cylinder portion 66 covering the first cylinder portion 56, and the first cylinder portion covering the first flange portion 54. The second flange portion 68 is formed on the base end side (in the direction of arrow A) of the second tube portion 66.

この第２筒部６６の外周面には、図１〜図４に示されるように、半径外方向に向かって突出した複数（例えば、８個）の第１突起部７０が形成され、該第１突起部７０は、例えば、断面半円状に突出し、前記外周面の周方向に沿って互いに等間隔離間するように設けられると共に、前記第２筒部６６の軸方向（矢印Ａ、Ｂ方向）に沿って所定間隔離間するように設けられている。   As shown in FIGS. 1 to 4, a plurality of (for example, eight) first protrusions 70 projecting outward in the radial direction are formed on the outer peripheral surface of the second cylindrical portion 66. For example, the one projecting portion 70 protrudes in a semicircular cross section, and is provided so as to be spaced apart from each other at equal intervals along the circumferential direction of the outer peripheral surface, and the axial direction of the second cylindrical portion 66 (directions of arrows A and B) ) Along a predetermined distance.

また、第２フランジ部６８には、先端側（第２筒部６６側、矢印Ｂ方向）となる端面に、該先端側に向かって突出した複数（例えば、４個）の第２突起部７２が形成され、該第２突起部７２は前記第１突起部７０と同様に断面半円状に形成され、且つ、前記第２フランジ部６８の周方向に沿って互いに等間隔離間するように設けられる。なお、第１及び第２突起部７０、７２の数量及びその配置は、例えば、第１信号伝達部材５８の形状に応じて適宜設定される。   Further, the second flange portion 68 has a plurality of (for example, four) second protrusions 72 projecting toward the distal end side on the end surface which is the distal end side (the second tube portion 66 side, the direction of arrow B). The second protrusions 72 are formed in a semicircular cross section like the first protrusions 70, and are provided so as to be spaced apart from each other along the circumferential direction of the second flange part 68. It is done. Note that the quantity and arrangement of the first and second protrusions 70 and 72 are appropriately set according to the shape of the first signal transmission member 58, for example.

一方、絶縁体６２の径方向に沿った厚さ中央には、例えば、メッキ層からなる第１導電層６４が形成され、該第１導電層６４は、略一定の厚さで前記絶縁体６２に沿って円筒状に形成される。この第１導電層６４は、絶縁体６２が樹脂製材料から成形によって形成されることで内部に設けられると共に、第１及び第２突起部７０、７２が前記絶縁体６２の成形時に同時に形成される。   On the other hand, a first conductive layer 64 made of, for example, a plating layer is formed in the center of the thickness along the radial direction of the insulator 62, and the first conductive layer 64 has a substantially constant thickness. Is formed in a cylindrical shape. The first conductive layer 64 is provided inside by forming the insulator 62 from a resin material by molding, and the first and second protrusions 70 and 72 are simultaneously formed when the insulator 62 is molded. The

この絶縁体６２の外周側には、例えば、金属製材料から円筒状に形成されたカバー部材７４が設けられる。このカバー部材７４は、先端側に設けられ前記絶縁体６２の第２筒部６６を覆う第１カバー部７６と、前記第１カバー部７６の基端側に設けられ該絶縁体６２の第２フランジ部６８を覆う第２カバー部７８とからなり、前記第２カバー部７８が前記第１カバー部７６に対して拡径して形成される。   On the outer peripheral side of the insulator 62, for example, a cover member 74 formed in a cylindrical shape from a metal material is provided. The cover member 74 is provided on the distal end side and covers the second cylindrical portion 66 of the insulator 62, and the cover member 74 is provided on the proximal end side of the first cover portion 76 and the second of the insulator 62. The second cover portion 78 includes a second cover portion 78 that covers the flange portion 68, and the second cover portion 78 is formed with an enlarged diameter with respect to the first cover portion 76.

また、カバー部材７４は、絶縁体６２の先端から基端側（矢印Ａ方向）に向かって挿通されることで装着され、第１カバー部７６の内周面が第１突起部７０へ接触しながら挿入され、第２カバー部７８が第２突起部７２に当接することで軸方向（矢印Ａ方向）に係止される。   The cover member 74 is mounted by being inserted from the distal end of the insulator 62 toward the proximal end side (the direction of the arrow A), and the inner peripheral surface of the first cover portion 76 contacts the first protrusion 70. The second cover part 78 comes into contact with the second protrusion 72 and is locked in the axial direction (arrow A direction).

すなわち、カバー部材７４は、第１信号伝達部材５８との間において径方向及び軸方向に若干のクリアランスを有しており、該クリアランスに複数の第１及び第２突起部７０、７２が設けられ、該第１及び第２突起部７０、７２によってカバー部材７４における第１カバー部７６の内周面及び第２カバー部７８の内面がそれぞれ保持された状態で装着される。   That is, the cover member 74 has a slight clearance in the radial direction and the axial direction between the cover member 74 and the first signal transmission member 58, and a plurality of first and second protrusions 70 and 72 are provided in the clearance. The first and second projecting portions 70 and 72 are mounted in a state where the inner peripheral surface of the first cover portion 76 and the inner surface of the second cover portion 78 of the cover member 74 are respectively held.

さらに、カバー部材７４の先端には、図１に示されるように、センサ２０の基端側の外周面を保持する保持部８０が形成される。   Further, as shown in FIG. 1, a holding portion 80 that holds the outer peripheral surface on the proximal end side of the sensor 20 is formed at the distal end of the cover member 74.

第２信号伝達部材６０は、図１に示されるように、例えば、樹脂製材料から形成され、軸方向（矢印Ａ、Ｂ方向）に沿って所定長さを有した板形状からなり、その内部には通電可能な材料から形成された第２導電層８２（図２参照）が形成される。第２導電層８２は、例えば、メッキ層から形成され、略一定の厚さで第２信号伝達部材６０の軸方向（矢印Ａ、Ｂ方向）に沿って先端から基端まで延在している。   As shown in FIG. 1, the second signal transmission member 60 is formed of, for example, a resin material and has a plate shape having a predetermined length along the axial direction (the directions of arrows A and B). A second conductive layer 82 (see FIG. 2) made of a material that can be energized is formed. The second conductive layer 82 is formed of, for example, a plating layer, and extends from the distal end to the proximal end along the axial direction (arrow A, B direction) of the second signal transmission member 60 with a substantially constant thickness. .

この第２信号伝達部材６０の先端は、軸線と直交する方向に突出した第１接続部８４が形成される。この第１接続部８４は、第１信号伝達部材５８の基端に臨むように形成され、その凹部に第１信号伝達部材５８が挿入され、該凹部内に露呈した第２導電層８２と前記第１信号伝達部材５８の第１導電層６４とが半田等によって電気的に接続される。   The tip of the second signal transmission member 60 is formed with a first connection portion 84 that protrudes in a direction orthogonal to the axis. The first connection portion 84 is formed so as to face the proximal end of the first signal transmission member 58, and the first signal transmission member 58 is inserted into the recess, and the second conductive layer 82 exposed in the recess and the above-mentioned The first conductive layer 64 of the first signal transmission member 58 is electrically connected by solder or the like.

一方、第２信号伝達部材６０の基端には、先端側に対して縮径した軸状の第２接続部８６を有し、前記第２接続部８６には、その外周面に沿って第２導電層８２の一部が環状に露出している。そして、第２接続部８６が、増幅部材４４の基板４８に対して接続されることで、第２信号伝達部材６０が増幅部材４４と電気的に接続される。   On the other hand, the second signal transmission member 60 has a shaft-shaped second connection portion 86 having a reduced diameter with respect to the distal end side at the proximal end, and the second connection portion 86 includes a second connection portion 86 along the outer peripheral surface thereof. A part of the two conductive layers 82 is exposed in a ring shape. Then, the second signal transmission member 60 is electrically connected to the amplification member 44 by connecting the second connection portion 86 to the substrate 48 of the amplification member 44.

これにより、第１及び第２信号伝達部材５８、６０を介してセンサ２０と信号端子２２とが互いに電気的に接続された状態となる。   As a result, the sensor 20 and the signal terminal 22 are electrically connected to each other via the first and second signal transmission members 58 and 60.

本発明の実施の形態に係る筒内圧センサ付き燃料噴射弁１０は、基本的には以上のように構成されるものであり、次にその動作並びに作用効果について説明する。   The in-cylinder pressure sensor-equipped fuel injection valve 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described.

図示しない内燃機関の運転中において、電子制御ユニットからの制御信号によって燃料噴射弁１０の駆動端子３６からコイル２８へ通電がなされ、前記コイル２８が励磁することで燃料噴射部１８の弁体が開弁し、燃料供給部１６の供給通路に供給された高圧の燃料が燃料噴射部１８を介して前記内燃機関の燃焼室内へと直接噴射される。この際、センサ２０は、燃焼室内の圧力（筒内圧）が付与されることで、圧電素子が前記圧力に応じた電圧を発生して検出信号として出力する。   During operation of the internal combustion engine (not shown), the coil 28 is energized from the drive terminal 36 of the fuel injection valve 10 by a control signal from the electronic control unit, and the valve body of the fuel injection unit 18 is opened by exciting the coil 28. The high-pressure fuel supplied to the supply passage of the fuel supply unit 16 is directly injected into the combustion chamber of the internal combustion engine via the fuel injection unit 18. At this time, the sensor 20 is applied with a pressure (in-cylinder pressure) in the combustion chamber, so that the piezoelectric element generates a voltage corresponding to the pressure and outputs it as a detection signal.

この検出信号は、センサ２０、第１信号伝達部材５８、第２信号伝達部材６０を経て増幅部材４４へと出力され、該増幅部材４４において前記検出信号が増幅された後、信号端子２２を介して電子制御ユニットへと出力される。そして、例えば、電子制御ユニットにおいて、増幅された検出信号から燃焼室の圧力が算出され、該圧力に基づいた燃焼制御等に利用される。   This detection signal is output to the amplification member 44 through the sensor 20, the first signal transmission member 58, and the second signal transmission member 60. After the detection signal is amplified by the amplification member 44, the detection signal is passed through the signal terminal 22. Output to the electronic control unit. For example, in the electronic control unit, the pressure in the combustion chamber is calculated from the amplified detection signal, and is used for combustion control based on the pressure.

以上のように、本実施の形態では、先端にセンサ２０を有した燃料噴射弁１０において、信号伝達部２４を構成する第１信号伝達部材５８の外周面に複数の第１突起部７０を設けると共に、カバー部材７４に臨む第２フランジ部６８の端面に複数の第２突起部７２を設けることで、前記第１信号伝達部材５８の外周側にカバー部材７４を装着した際、その第１カバー部７６の内周面が第１突起部７０に当接し、第２カバー部７８の内面が第２突起部７２へと当接することで、前記カバー部材７４と前記第１信号伝達部材５８との相対的な移動（がたつき）が防止される。具体的には、第１突起部７０によって軸方向（矢印Ａ、Ｂ方向）と直交した第１信号伝達部材５８の径方向への相対変位が規制され、第２突起部７２によって前記第１信号伝達部材５８の軸方向（矢印Ａ、Ｂ方向）への相対変位が規制される。   As described above, in the present embodiment, in the fuel injection valve 10 having the sensor 20 at the tip, a plurality of first protrusions 70 are provided on the outer peripheral surface of the first signal transmission member 58 constituting the signal transmission unit 24. In addition, by providing a plurality of second protrusions 72 on the end face of the second flange portion 68 facing the cover member 74, when the cover member 74 is mounted on the outer peripheral side of the first signal transmission member 58, the first cover is provided. The inner peripheral surface of the portion 76 is in contact with the first protrusion 70, and the inner surface of the second cover portion 78 is in contact with the second protrusion 72, so that the cover member 74 and the first signal transmission member 58 are in contact with each other. Relative movement (rattle) is prevented. Specifically, relative displacement in the radial direction of the first signal transmission member 58 orthogonal to the axial direction (the directions of arrows A and B) is restricted by the first protrusion 70, and the first signal is controlled by the second protrusion 72. The relative displacement of the transmission member 58 in the axial direction (arrow A, B direction) is restricted.

その結果、内燃機関の振動等によって第１信号伝達部材５８がカバー部材７４に対して所定位置からずれてしまうことが防止され確実に保持されるため、該第１信号伝達部材５８の位置ずれに起因した信号伝達部２４の断線等を確実に防止することができる。   As a result, the first signal transmission member 58 is prevented from being displaced from a predetermined position with respect to the cover member 74 due to vibration of the internal combustion engine or the like, and is securely held. It is possible to reliably prevent the disconnection of the signal transmission unit 24 caused by the failure.

また、第１及び第２突起部７０、７２は、樹脂製材料からなる第１信号伝達部材５８の絶縁体６２と一体的に形成されているため、金属製材料からなるカバー部材７４を外周側から挿通させる際、前記第１及び第２突起部７０、７２をクリアランスより予め大きく形成しておくことで、前記カバー部材７４によって前記第１及び第２突起部７０、７２を押し潰しながら装着することができる。そのため、第１信号伝達部材５８をカバー部材７４に対してより一層確実且つ強固に保持することができ、それに伴って、前記第１信号伝達部材５８のがたつきが好適に防止される。   Further, since the first and second protrusions 70 and 72 are formed integrally with the insulator 62 of the first signal transmission member 58 made of a resin material, the cover member 74 made of a metal material is placed on the outer peripheral side. When the first and second protrusions 70 and 72 are formed larger than the clearance in advance, the first and second protrusions 70 and 72 are mounted while being crushed by the cover member 74. be able to. Therefore, the first signal transmission member 58 can be more securely and firmly held with respect to the cover member 74, and accordingly, the rattling of the first signal transmission member 58 is suitably prevented.

さらに、第１及び第２突起部７０、７２は、例えば、第１導電層６４を内蔵する絶縁体６２の成形時に同時に形成することができるため、製造工程及び製造コストの増加を招くことがなく好適である。   Furthermore, since the first and second protrusions 70 and 72 can be formed at the same time as the formation of the insulator 62 including the first conductive layer 64, for example, the manufacturing process and the manufacturing cost are not increased. Is preferred.

さらにまた、第１及び第２突起部７０、７２は、絶縁体６２から離間する方向に向かって断面半円状に突出し、且つ、その数量が制限されているため、カバー部材７４を第１信号伝達部材５８の外周面に摺接させながら挿通させる場合と比較し、前記第１及び第２突起部７０、７２のみに摺接させながら挿通させることで挿入抵抗が好適に低減され、組付性を向上させることができる。   Furthermore, since the first and second projecting portions 70 and 72 project in a semicircular cross section toward the direction away from the insulator 62 and the number thereof is limited, the cover member 74 is connected to the first signal. Compared with the case where the transmission member 58 is inserted while being slidably contacted with the outer peripheral surface, the insertion resistance is suitably reduced by being inserted while being slidably contacted only with the first and second protrusions 70 and 72, and the assembly property Can be improved.

なお、本発明に係る筒内圧センサ付き燃料噴射弁は、上述の実施の形態に限らず、本発明の要旨を逸脱することなく、種々の構成を採り得ることはもちろんである。   In addition, the fuel injection valve with an in-cylinder pressure sensor according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

１０…筒内圧センサ付き燃料噴射弁 １２…ハウジング
１４…樹脂モールド部 １６…燃料供給部
１８…燃料噴射部 ２０…センサ
２２…信号端子 ２４…信号伝達部
４４…増幅部材 ５２…バルブハウジング
５８…第１信号伝達部材 ６０…第２信号伝達部材
６２…絶縁体 ６４…第１導電層
６６…第２筒部 ７０…第１突起部
７２…第２突起部 ７８…第２カバー部
８２…第２導電層 DESCRIPTION OF SYMBOLS 10 ... Fuel injection valve with cylinder pressure sensor 12 ... Housing 14 ... Resin mold part 16 ... Fuel supply part 18 ... Fuel injection part 20 ... Sensor 22 ... Signal terminal 24 ... Signal transmission part 44 ... Amplifying member 52 ... Valve housing 58 ... First DESCRIPTION OF SYMBOLS 1 Signal transmission member 60 ... 2nd signal transmission member 62 ... Insulator 64 ... 1st conductive layer 66 ... 2nd cylinder part 70 ... 1st projection part 72 ... 2nd projection part 78 ... 2nd cover part 82 ... 2nd conductivity layer

Claims (5)

内燃機関の燃焼室に対して燃料を直接噴射する燃料噴射弁の端部に燃焼室内の筒内圧を検出するセンサを有した筒内圧センサ付き燃料噴射弁において、
前記センサに接続され前記筒内圧に基づいた検出信号を伝達する信号伝達部材と、
前記信号伝達部材の外側を覆うカバー部材と、
を備え、
前記信号伝達部材には、前記カバー部材に当接する突起部を備えることを特徴とする筒内圧センサ付き燃料噴射弁。 In a fuel injection valve with an in-cylinder pressure sensor having a sensor for detecting the in-cylinder pressure in the combustion chamber at the end of the fuel injection valve that directly injects fuel into the combustion chamber of the internal combustion engine,
A signal transmission member connected to the sensor for transmitting a detection signal based on the in-cylinder pressure;
A cover member covering the outside of the signal transmission member;
With
The fuel injection valve with an in-cylinder pressure sensor, wherein the signal transmission member includes a protrusion that contacts the cover member. 請求項１記載の筒内圧センサ付き燃料噴射弁において、
前記信号伝達部材は、前記検出信号を出力する導電層を樹脂製材料によって封止した封止体からなり、前記突起部が前記封止体と一体的に形成されることを特徴とする筒内圧センサ付き燃料噴射弁。 The fuel injection valve with an in-cylinder pressure sensor according to claim 1,
The in-cylinder pressure is characterized in that the signal transmission member includes a sealing body in which a conductive layer that outputs the detection signal is sealed with a resin material, and the protrusion is formed integrally with the sealing body. Fuel injection valve with sensor. 請求項１又は２記載の筒内圧センサ付き燃料噴射弁において、
前記突起部は、前記信号伝達部材の径方向外側に突出するように形成されることを特徴とする筒内圧センサ付き燃料噴射弁。 The fuel injection valve with an in-cylinder pressure sensor according to claim 1 or 2,
The fuel injection valve with an in-cylinder pressure sensor, wherein the protrusion is formed so as to protrude outward in the radial direction of the signal transmission member. 請求項１〜３のいずれか１項に記載の筒内圧センサ付き燃料噴射弁において、
前記突起部は、前記信号伝達部材の軸方向に突出するように形成されることを特徴とする筒内圧センサ付き燃料噴射弁。 In the fuel injection valve with an in-cylinder pressure sensor according to any one of claims 1 to 3,
The fuel injection valve with an in-cylinder pressure sensor, wherein the protrusion is formed so as to protrude in an axial direction of the signal transmission member. 請求項２〜４のいずれか１項に記載の筒内圧センサ付き燃料噴射弁において、
前記カバー部材は金属製材料から形成されることを特徴とする筒内圧センサ付き燃料噴射弁。 In the fuel injection valve with a cylinder pressure sensor according to any one of claims 2 to 4,
The fuel injection valve with an in-cylinder pressure sensor, wherein the cover member is made of a metal material.
JP2015008440A 2015-01-20 2015-01-20 Fuel injection valve with cylinder pressure sensor Pending JP2016133071A (en)

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DE102016200573.1A DE102016200573A1 (en) 2015-01-20 2016-01-18 Fuel injection valve with cylinder internal pressure sensor

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