JPS6211180B2 - - Google Patents
Info
- Publication number
- JPS6211180B2 JPS6211180B2 JP4751581A JP4751581A JPS6211180B2 JP S6211180 B2 JPS6211180 B2 JP S6211180B2 JP 4751581 A JP4751581 A JP 4751581A JP 4751581 A JP4751581 A JP 4751581A JP S6211180 B2 JPS6211180 B2 JP S6211180B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- injection
- valve
- push rod
- opening pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000002347 injection Methods 0.000 claims description 99
- 239000007924 injection Substances 0.000 claims description 99
- 239000000446 fuel Substances 0.000 claims description 47
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 230000000452 restraining effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 238000003780 insertion Methods 0.000 description 7
- 230000037431 insertion Effects 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- 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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
【発明の詳細な説明】
本発明は直接噴射式内燃機関用２段噴射型燃料
噴射弁における主噴射時の開弁圧の測定方法及び
測定装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for measuring valve opening pressure during main injection in a two-stage fuel injection valve for a direct injection type internal combustion engine.
直接噴射式デイーゼル機関の燃費及び低速安定
性の改善対策として噴射初期において作用する従
来のノズルばねとは別個のノズルばねをノズルホ
ルダ内に設けて噴射初期の針弁のリフトを制限す
ることにより噴射初期の噴射率を下げるととも
に、それに続く主噴射を第１、第２ノズルばねの
合力に抗し得る開弁圧で高い噴射率で行うように
したいわゆる２段噴射型燃料噴射弁が提案されて
いるが、この種の２段噴射型燃料噴射弁にあつて
はその構造上、主噴射時の開弁圧を直接測定する
ことは従来の測定装置、例えば実開昭53−115217
号公報に示された装置のみでは不可能であつた。
このため燃料噴射弁の組立時における主噴射時の
開弁圧を調整するに当つては初期噴射の開弁圧を
調整したときと同様、針弁リフトが零の位置で代
用開弁圧によつて調整する方法をとつていた。然
しこの方法では調整に多くの時間を要するばかり
ではなく、組立完成品の主噴射時の開弁圧を検査
することができない不都合があつた。 As a measure to improve the fuel efficiency and low-speed stability of direct-injection diesel engines, a separate nozzle spring is installed in the nozzle holder, which is separate from the conventional nozzle spring that acts at the beginning of injection, to limit the lift of the needle valve at the beginning of injection. A so-called two-stage fuel injection valve has been proposed in which the initial injection rate is lowered and the subsequent main injection is performed at a high injection rate at a valve opening pressure that can resist the resultant force of the first and second nozzle springs. However, due to the structure of this type of two-stage fuel injection valve, it is difficult to directly measure the valve opening pressure during main injection using conventional measuring devices, such as Utility Model Application No. 53-115217.
This would not have been possible using only the device shown in the publication.
Therefore, when assembling the fuel injection valve, when adjusting the valve opening pressure during main injection, just as when adjusting the valve opening pressure for initial injection, use the substitute valve opening pressure at the position where the needle valve lift is zero. He had found a way to adjust the situation. However, this method not only requires a lot of time for adjustment, but also has the disadvantage that it is not possible to inspect the valve opening pressure during the main injection of the assembled finished product.
本発明は上記に鑑みなされたもので以下図面に
基づき実施例について説明する。 The present invention has been made in view of the above, and embodiments will be described below based on the drawings.
第１図は２段噴射型燃料噴射弁（以下単に燃料
噴射弁という）の１例を示したもので、本発明の
説明に先立ち該燃料噴射弁の構成、作動について
説明する。ノズルホルダ１の先端には噴口２ａを
もち内部に摺動自在に挿入された針弁３をもつ噴
射ノズル２がノズルナツト４によりノズルホルダ
１に取付けられている。針弁３の上端には第１押
棒５が連結され、該押棒５の上端のばね座５ａに
は第１ノズルばね６の一端が当接している。第１
ノズルばね６の他端はシム７を介して第１ノズル
ばねの調節部材であるナツト８に当接し、ナツト
８の上端面にはロツクナツト９が当接している。
ノズルホルダ１の反ノズル側端部には調節用ねじ
部材１０が螺着され、その内部には上端面に開口
する凹部が形成され、凹部の底部内端面には第２
押棒１１のばね座１１ａが掛止され、該第２押棒
の下端は第１押棒５のばね座５ａに近接してい
る。上記調節ねじ部材１０は初期噴射リフトを調
節するもので、この調節を行つた後ロツクナツト
１２で固定される。調節ねじ部材１０の凹部内に
はばね座１１ａに下端を当接させた第２ノズルば
ね１３が収納され、その上端は凹部の上端部内に
回転自在に螺着された別の調節ねじ部材１４の下
端面に当接している。この調節ねじ部材１４は第
２ノズルばねの設定荷重を調節するもので、調節
後ロツクナツト１５にて固定され、更にねじ部材
１０にキヤツプナツト１６が被冠されている。ね
じ部材１０の側壁の孔１７はリーク燃料を上部に
逃す孔である。 FIG. 1 shows an example of a two-stage fuel injection valve (hereinafter simply referred to as a fuel injection valve), and prior to explaining the present invention, the structure and operation of the fuel injection valve will be explained. An injection nozzle 2 having a spout 2a at the tip of the nozzle holder 1 and a needle valve 3 slidably inserted therein is attached to the nozzle holder 1 by a nozzle nut 4. A first push rod 5 is connected to the upper end of the needle valve 3, and one end of a first nozzle spring 6 is in contact with a spring seat 5a at the upper end of the push rod 5. 1st
The other end of the nozzle spring 6 abuts via a shim 7 a nut 8 which is an adjusting member for the first nozzle spring, and a lock nut 9 abuts the upper end surface of the nut 8.
An adjustment screw member 10 is screwed onto the opposite end of the nozzle holder 1, and a recess opening to the upper end surface is formed inside the adjustment screw member 10, and a second screw member 10 is provided at the bottom inner end surface of the recess.
The spring seat 11a of the push rod 11 is engaged, and the lower end of the second push rod is close to the spring seat 5a of the first push rod 5. The adjusting screw member 10 is used to adjust the initial injection lift, and after this adjustment is made, it is fixed with a lock nut 12. A second nozzle spring 13 with its lower end in contact with the spring seat 11a is housed in the recess of the adjustment screw member 10, and its upper end is connected to another adjustment screw member 14 rotatably screwed into the upper end of the recess. It is in contact with the lower end surface. This adjusting screw member 14 is used to adjust the set load of the second nozzle spring, and after adjustment, it is fixed with a lock nut 15, and furthermore, a cap nut 16 is mounted on the screw member 10. The hole 17 in the side wall of the screw member 10 is a hole through which leaked fuel escapes to the top.
尚１８および１９は油密パツキン、２０は燃料
通路で図示しない燃料噴射ポンプからの燃料を噴
射管、ノズルホルダ１を介して噴射ノズル２内の
加圧空間２ｂに案内する。 Note that 18 and 19 are oil-tight gaskets, and 20 is a fuel passage that guides fuel from a fuel injection pump (not shown) through an injection pipe and nozzle holder 1 to a pressurized space 2b within the injection nozzle 2.
第１押棒５のばね座部５ａは第２押棒１１の対
向下端と針弁３の切期噴射リフト量に対応する間
隙△ｌだけ隔てられている。 The spring seat portion 5a of the first push rod 5 is separated from the opposite lower end of the second push rod 11 by a gap Δl corresponding to the cut-off injection lift amount of the needle valve 3.
次に上述の燃料噴射弁の作動を説明する。燃料
通路２０からの燃料により加圧空間２ｂ内の圧力
が第１ノズルばね６により設定される初期噴射開
弁圧を越えると針弁３はリフトし初め、初期噴射
リフト量△ｌ完了点で第１押棒５の上端５ａが第
２押棒１１の下端と衝合する。ここで加圧空間２
ｂ内圧力が第２ノズルばね１３の設定荷重と第１
ノズルばね６の該完了点でのばね力との和を越え
ない限り第２押棒１１がリフトしない。加圧空間
２ｂ内圧力が前記二つのばねの荷重和を越えると
針弁３は第１押棒５を介して第２押棒１１を押圧
して第１ノズルばね６および第２ノズルばね１３
を変位せしめてリフトし針弁３の摺動軸部の上端
面とノズルホルダ１の対向下端面間の間隙によつ
て決まる最大リフト量ｌを完了する。 Next, the operation of the above-mentioned fuel injection valve will be explained. When the pressure in the pressurized space 2b due to the fuel from the fuel passage 20 exceeds the initial injection valve opening pressure set by the first nozzle spring 6, the needle valve 3 begins to lift, and at the completion point of the initial injection lift amount Δl, the needle valve 3 starts to lift. The upper end 5a of the first push rod 5 collides with the lower end of the second push rod 11. Here pressurized space 2
b The internal pressure is the set load of the second nozzle spring 13 and the first
The second push rod 11 will not lift unless the force exceeds the sum of the spring force of the nozzle spring 6 at the completion point. When the pressure inside the pressurized space 2b exceeds the sum of the loads of the two springs, the needle valve 3 presses the second push rod 11 via the first push rod 5, and the first nozzle spring 6 and the second nozzle spring 13
is displaced and lifted to complete the maximum lift amount l determined by the gap between the upper end surface of the sliding shaft portion of the needle valve 3 and the opposing lower end surface of the nozzle holder 1.
かかる構成の燃料噴射弁において、従来の開弁
圧の調整方法は、先づ圧力計と加圧ポンプをもつ
ノズルテスタの噴射管を燃料噴射弁の燃料通路２
０に接続し、最初に第１ノズルばね６の設定荷重
の調整を行う。この場合、第２ノズルばね１３と
第２押棒１１を収納した調節用ねじ部材１０およ
びロツクナツト９をノズルホルダ１から取り外
し、外部から適当なトライバーをナツト８のドラ
イバー溝に嵌合して、所望の初期噴射開弁圧を得
るようにナツト８を回して行い調節後ロツクナツ
ト９を嵌め込んでナツト８を固定する。 In a fuel injection valve having such a configuration, the conventional method for adjusting the valve opening pressure is to first connect the injection pipe of a nozzle tester having a pressure gauge and a pressure pump to the fuel passage 2 of the fuel injection valve.
0, and first adjust the set load of the first nozzle spring 6. In this case, remove the adjusting screw member 10 housing the second nozzle spring 13 and the second push rod 11 and the lock nut 9 from the nozzle holder 1, and fit a suitable driver from the outside into the driver groove of the nut 8 to obtain the desired result. The nut 8 is turned to obtain the initial injection valve opening pressure, and after adjustment, the lock nut 9 is fitted to fix the nut 8.
次いで、第２ノズルばね１３の設定荷重の調整
を行うには前述の第２ノズルばね１３と第２押棒
１１を収納した調節用ねじ部材１０をノズルホル
ダ１に嵌め込み、該ねじ部材１０を回転して、第
１押棒５の上端面と第２押棒１１の下端面の間隔
△ｌが零となるように第１押棒５と第２押棒１１
とを接触させ、この状態で所望の主噴射時の開弁
圧を得るべく調節ねじ部材１４を回転して、第２
ノズルばね１３の設定荷重を調整していた。従来
のこの方法は初期噴射の開弁圧を設定した位置で
△ｌリフト後主噴射時の開弁圧が所望の開弁圧に
なる筈と仮定して、主噴射の代用開弁圧を計算に
より求め、その開弁圧になるように第２ノズルば
ねの設定荷重を調整するもので、主噴射代用開弁
圧PO2′は次式により求められていた。 Next, in order to adjust the set load of the second nozzle spring 13, the adjustment screw member 10 housing the second nozzle spring 13 and the second push rod 11 described above is fitted into the nozzle holder 1, and the screw member 10 is rotated. Then, the first push rod 5 and the second push rod 11 are adjusted so that the distance △l between the upper end surface of the first push rod 5 and the lower end surface of the second push rod 11 becomes zero.
and in this state, rotate the adjustment screw member 14 to obtain the desired valve opening pressure during main injection, and then
The set load of the nozzle spring 13 was being adjusted. This conventional method calculates the substitute valve opening pressure for main injection by assuming that the valve opening pressure during main injection after △l lift will be the desired valve opening pressure at the position where the initial injection valve opening pressure is set. The setting load of the second nozzle spring is adjusted to obtain the valve opening pressure, and the main injection substitute valve opening pressure PO2' was determined by the following formula.
PO2′＝（F2−△F1）／π／４（dn−ds）
ここでF2は所望の主噴射開弁圧に対応する第
１ノズルばねと第２ノズルばねのばね荷重の和で
次式による。 PO2′=(F2−△F1)/π/4(dn−ds) Here, F2 is the sum of the spring loads of the first nozzle spring and the second nozzle spring corresponding to the desired main injection valve opening pressure, and is calculated by the following formula. .
F2＝π／４dn×PO2
また△F1は第１ノズルばねが△ｌたわめられ
た時の荷重で
△F1＝k1×△ｌである。 F2=π/4dn×PO2 Also, △F1 is the load when the first nozzle spring is deflected by △l, and △F1=k1×△l.
式中
dn…………針弁３の摺動軸の径
ds…………針弁３が着座した時の弁座の径
k1…………第１ノズルばねのばね常数
PO2…………所望の主噴射開弁圧
上述の方法により主噴射の代用開弁圧PO2′に
第２ノズルばねの荷重を調節した後、調節ねじ部
材１４をロツクナツト１５で固定し、しかる後、
第１押棒５の上端面と第２押棒１１の下端面との
間隔が△ｌとなるまで調節用ねじ部材１０の変位
量をダイヤルゲージで計測しながらねじ部材１０
を回転して、△ｌが得られた後、ロツクナツト１
２でねじ部材１０を固定していた。従つてこの方
法では主噴射時の開弁圧PO2を直接測定すること
はできなかつた。 In the formula, dn……Diameter of the sliding shaft of the needle valve 3 ds……Diameter of the valve seat when the needle valve 3 is seated k1……Spring constant of the first nozzle spring PO2…… Desired main injection valve opening pressure After adjusting the load of the second nozzle spring to the main injection substitute valve opening pressure PO2' by the method described above, fix the adjusting screw member 14 with the lock nut 15, and then,
While measuring the displacement of the adjustment screw member 10 with a dial gauge until the distance between the upper end surface of the first push rod 5 and the lower end surface of the second push rod 11 becomes △l,
After rotating and obtaining △l, lock nut 1
2 to fix the screw member 10. Therefore, with this method, it was not possible to directly measure the valve opening pressure PO2 during main injection.
次に本発明による開弁圧測定方法及び装置の実
施例を図面に基づいて説明する。 Next, embodiments of the valve opening pressure measuring method and apparatus according to the present invention will be described based on the drawings.
第３図、第４図は本発明に基づく開弁圧測定装
置の取付部に燃料噴射弁を取付けた場合の側面図
及び平面図を、また第５図は第３，４図に示した
取付部と公知のノズルテスタを接続した本発明に
よる開弁圧測定装置の概略図を示したもので、２
１は燃料噴射弁、２２は取付部である。まず取付
部の構成を説明する２３−１は長方形をなす板状
の台板で、該台板２３−１の上面には上部外周面
にねじ２３−２ａと軸方向に長い溝２３−２ｂを
設けた円筒状の第１の支柱２３−２が固着されて
いる。２４は板材の一端にボス２４ａを固着し、
該ボス部を第１の支柱２３−２の外径部に嵌挿す
る孔２４ｂを有し、他端側に燃料噴射弁を挿通す
る挿入孔２４ｃと該挿入孔の左右両側に燃料噴射
弁の締付ボルト孔を嵌入する固定ピン２５が固定
され、孔２４ｂと孔２４ｃの中間位置には第２の
支柱２７が螺着された支持板で、該支柱板２４は
上下方向移動可能で燃料噴射弁の長さに応じて第
１の支柱２３−２に二つのナツト２６で固定され
ている。２８は支持板２４の第１の支柱２３−２
に対する回動を制限するボルトで該ボルトの先端
は細軸をなし、第１の支柱２３−２の軸方向の溝
２３−２ｂに挿入されている。２９は第４図に示
すように上方より見て一方の端部には第１の支柱
２３−２の外径より僅かに大きい溝巾で端面が開
口した長溝２９ａをもつ支点部２９ｂと、他端部
には開口部２９ｃをもつ押圧部２９ｄと開口部２
９ｃに連通して第２の支柱２７に差し込む溝２９
ｅを有する抑え板で側面より見た場合前記支点部
２９ｂ及び押圧部２９ｄが下方に凸起した板状よ
りなつており、ナツト３０を締めることにより支
点部２９ｂはナツト２６の上面に、押圧部２９ｄ
は燃料噴射弁の取付フランジの上面に当接して燃
料噴射弁を押圧固定するもので、噴射弁を取外す
場合はナツト３０をゆるめて抑え板２９を第３図
において右方向にずらせばよい。３１は第２押棒
の軸方向変位を検出する変位測定器としてのダイ
ヤルゲージでスピンドル先端には第６図に示すよ
うな燃料噴射弁の第２押棒１１のばね座面に接す
る接触棒３２が螺合接続されている。３３はダイ
ヤルゲージ３１を保持する保持腕でその一端にダ
イヤルゲージ３１が固定され、他端は支持板２４
に螺合固定された第３の支柱３４に摺動及び回動
可能に嵌挿され、止めねじ３５で適当な位置に固
定できるようになつている。また第３の支柱３４
にはコイルばね３６が嵌め込まれており、止めね
じ３５をゆるめた時に保持腕３３を上方に押し揚
げるようになつている。また第７図に示すように
支持板２４の挿入孔２４ｃの中心の延長線上に中
心をもつ台板２３−１の孔２３−１ａには端部を
圧入したブツシユ３７が設けられ、該ブツシユの
内部には例えばプラスチツクまたは硬質耐油性ゴ
ムよりなる閉鎖部材３８が配設され、該閉鎖部材
はブツシユ３７の外部ねじと螺合するキヤツプナ
ツト３９で固定されている。閉鎖部材３８の上端
面中央には噴射ノズル２の先端の乳頭部が嵌合す
る凹部３８ａを有し、燃料噴射弁が抑え板２９に
よつて押圧されることによつて、噴射ノズル２の
乳頭部が前記凹部３８ａに油密に圧接して噴口２
ａからの流出油を閉じ込める閉鎖部を形成してい
る。次にノズルテスタについて説明する。第５図
に示す４０は公知のノズルテスタで、４１は油
槽、４２は内部に燃料を加圧するプランジヤと逆
止弁をもつ加圧ポンプ、４３はプランジヤを揚程
するハンドレバー、４４は加圧油の圧力を検出す
る圧力計、４５は圧力計４４及び噴射管４６に加
圧油を供給する油路をもつ接手で噴射管４６の一
端は接手４５に、また他端は燃料噴射弁２１の燃
料通路２０に接続されている。 Figures 3 and 4 show a side view and a plan view of the fuel injection valve mounted on the mounting part of the valve opening pressure measuring device according to the present invention, and Figure 5 shows the installation shown in Figures 3 and 4. 2 is a schematic diagram of a valve opening pressure measuring device according to the present invention in which a part and a known nozzle tester are connected.
1 is a fuel injection valve, and 22 is a mounting portion. First, the configuration of the mounting part will be explained. Reference numeral 23-1 is a rectangular plate-shaped base plate. The upper surface of the base plate 23-1 has a screw 23-2a and an axially long groove 23-2b on the upper outer circumferential surface. The provided cylindrical first column 23-2 is fixed. 24 fixes a boss 24a to one end of the plate material,
It has a hole 24b for inserting the boss part into the outer diameter part of the first support column 23-2, an insertion hole 24c for inserting the fuel injection valve on the other end side, and an insertion hole 24c for inserting the fuel injection valve on both left and right sides of the insertion hole. A fixing pin 25 that fits into the tightening bolt hole is fixed, and a second support plate 27 is screwed to the intermediate position between the holes 24b and 24c.The support plate 24 is movable in the vertical direction and is used for fuel injection. It is fixed to the first column 23-2 with two nuts 26 depending on the length of the valve. 28 is the first support column 23-2 of the support plate 24
The tip of the bolt has a thin shaft and is inserted into the axial groove 23-2b of the first support column 23-2. As shown in FIG. 4, the fulcrum part 29b has a long groove 29a at one end with a groove width slightly larger than the outer diameter of the first support column 23-2 and an open end face, as seen from above, and a supporting point 29b. A pressing part 29d having an opening 29c at the end and an opening 2
A groove 29 that communicates with 9c and is inserted into the second support 27
When viewed from the side with a restraining plate having a diameter of 29d
3 is used to press and fix the fuel injector by coming into contact with the upper surface of the mounting flange of the fuel injector. To remove the injector, simply loosen the nut 30 and shift the restraining plate 29 to the right in FIG. 3. Reference numeral 31 denotes a dial gauge as a displacement measuring device for detecting the axial displacement of the second push rod, and a contact rod 32 that contacts the spring seat surface of the second push rod 11 of the fuel injection valve is threaded at the tip of the spindle as shown in FIG. connected. 33 is a holding arm that holds the dial gauge 31; the dial gauge 31 is fixed to one end of the holding arm, and the support plate 24 is attached to the other end of the holding arm.
It is slidably and rotatably fitted into a third support column 34 which is screwed and fixed thereto, and can be fixed in an appropriate position with a set screw 35. Also, the third pillar 34
A coil spring 36 is fitted into the retaining arm 33 so that the retaining arm 33 is pushed upward when the set screw 35 is loosened. Further, as shown in FIG. 7, a bush 37 whose end is press-fitted is provided in the hole 23-1a of the base plate 23-1 whose center is on an extension of the center of the insertion hole 24c of the support plate 24. A closing member 38 made of plastic or hard oil-resistant rubber, for example, is arranged inside and is secured by a cap nut 39 which engages with the external thread of the bush 37. The center of the upper end surface of the closing member 38 has a recess 38a into which the papilla at the tip of the injection nozzle 2 fits. is in oil-tight pressure contact with the recess 38a to open the spout 2.
It forms a closure part that confines the oil spilled from a. Next, the nozzle tester will be explained. 5, 40 is a known nozzle tester, 41 is an oil tank, 42 is a pressurizing pump with a plunger and a check valve for pressurizing fuel inside, 43 is a hand lever for lifting the plunger, and 44 is a pressurized oil tank. A pressure gauge 45 detects pressure, and 45 is a joint with an oil passage for supplying pressurized oil to the pressure gauge 44 and the injection pipe 46. One end of the injection pipe 46 is connected to the joint 45, and the other end is connected to the fuel passage of the fuel injection valve 21. 20.
以上述べた取付部とノズルテスタより構成され
た開弁圧測定装置において燃料噴射弁の主噴射時
の開弁圧を測定するには、従来の方法で予め初期
噴射時の開弁圧を調整した燃料噴射弁を取付部に
装着し、燃料噴射弁の燃料通路２０にノズルテス
タの噴射管４６を接続する。しかる後第２押棒１
１及び第２ノズルばね１３を収納した調節ねじ部
材１０をノズルホルダ１に取付け、第３の支柱３
４に支持されてダイヤルゲージ３１を固定した保
持腕３３を下方動してダイヤルゲージに接続され
た接触棒３２を調節ねじ部材１４の中央細孔に挿
入して接触棒の先端を第２押棒１１のばね座面に
当接させ、保持腕３３を第３の支柱３４に固定す
る。保持腕３３を固定後、更に調節ねじ部材１０
を回転して第１押棒５の上端面と第２押棒１１の
先端との間隔△ｌを零とする。△ｌの零位置はダ
イヤルゲージ３１の指針の動きが停止するので感
知できる。この△ｌが零の位置を第１基点として
ダイヤルゲージの指針に０目盛を合わせる。第１
基点設定後、調節ねじ部材１０を前記の場合とは
逆方向に回転し、第１押棒５の上端面と第２押棒
１１の先端との間隔を所定寸法△ｌに調節する。
寸法△ｌはダイヤルゲージにより読みとることが
できる。△ｌを得たならば調節ねじ部材１０をロ
ツクナツト１２で固定する。以上で△ｌ即ち主噴
射時の開弁圧を調整する針弁リフト位置が決ま
り、この位置を第２基点とする。次にノズルテス
タ４０の加圧ポンプ４２より加圧油を噴射ノズル
２の加圧空間２ｂに供給しながら、第２ノズルば
ね１３の設定荷重を調節ねじ部材１４を回転して
調節し、第２基点で停止していたダイヤルゲージ
３１の指針が動く時の加圧油の圧力をノズルテス
タの圧力計４４で読み取り、その圧力が所定の主
噴射時の開弁圧力となるように調整する。 In order to measure the valve opening pressure during the main injection of the fuel injection valve using the valve opening pressure measuring device consisting of the mounting part and the nozzle tester described above, it is necessary to use the conventional method to adjust the valve opening pressure at the initial injection. The injection valve is attached to the mounting part, and the injection pipe 46 of the nozzle tester is connected to the fuel passage 20 of the fuel injection valve. After that, the second push rod 1
The adjusting screw member 10 housing the first and second nozzle springs 13 is attached to the nozzle holder 1, and the third support 3
4 to which the dial gauge 31 is fixed is moved downward, the contact rod 32 connected to the dial gauge is inserted into the central hole of the adjusting screw member 14, and the tip of the contact rod is moved downward to the second push rod 11. The holding arm 33 is fixed to the third support column 34 by contacting the spring bearing surface of the holding arm 33. After fixing the holding arm 33, further adjust the adjusting screw member 10.
is rotated to make the distance Δl between the upper end surface of the first push rod 5 and the tip of the second push rod 11 zero. The zero position of Δl can be sensed because the pointer of the dial gauge 31 stops moving. Set the pointer of the dial gauge to zero scale using the position where Δl is zero as the first reference point. 1st
After setting the base point, the adjusting screw member 10 is rotated in the opposite direction to that in the above case, and the distance between the upper end surface of the first push rod 5 and the tip of the second push rod 11 is adjusted to a predetermined dimension Δl.
The dimension Δl can be read with a dial gauge. Once Δl is obtained, the adjusting screw member 10 is fixed with the lock nut 12. As described above, Δl, that is, the needle valve lift position for adjusting the valve opening pressure during main injection is determined, and this position is set as the second reference point. Next, while supplying pressurized oil from the pressurizing pump 42 of the nozzle tester 40 to the pressurizing space 2b of the injection nozzle 2, the set load of the second nozzle spring 13 is adjusted by rotating the adjusting screw member 14, and the second base point is adjusted. The pressure of the pressurized oil when the pointer of the dial gauge 31, which had stopped at the time, moves, is read by the pressure gauge 44 of the nozzle tester, and the pressure is adjusted so that it becomes the valve opening pressure during the predetermined main injection.
調整終了後はロツクナツト１５で調節ねじ部材
１４を固定する。また針弁３の全リフト寸法 を
計測するには針弁３の動きに連動して動くダイヤ
ルゲージ３１の指針の動きが停止するまで供給油
圧を上昇させ、指針が停止した位置の目盛を読み
取ることにより可能である。 After the adjustment is completed, the adjusting screw member 14 is fixed with the lock nut 15. In addition, to measure the total lift dimension of the needle valve 3, increase the supply oil pressure until the pointer of the dial gauge 31, which moves in conjunction with the movement of the needle valve 3, stops moving, and read the scale at the position where the pointer stops. This is possible.
測定後は保持腕３３の固定用止めねじ３５を弛
めて保持腕３３に固定のダイヤルゲージを一緒に
上昇させダイヤルゲージに連結の接触棒３２を調
節ねじ部材１４より抜き出してから、キヤツプナ
ツト１６を螺着する。 After measurement, loosen the fixing set screw 35 of the holding arm 33, raise the dial gauge fixed to the holding arm 33 together, pull out the contact rod 32 connected to the dial gauge from the adjustment screw member 14, and then tighten the cap nut 16. Screw on.
以上述べたように本発明による２段噴射型燃料
噴射弁の開弁圧測定方法および測定装置によれ
ば、従来困難とされていた針弁リフト△ｌ位置に
おける主噴射時の開弁圧を容易に測定することが
できるので開弁圧の調整精度の向上と調整作業の
効率化に効果を有するものである。尚第２押棒の
軸方向変位の計測はダイヤルゲージに限定するも
のではなく、針弁のリフト量測定手段として通常
知られている技術を適応できることは云うまでも
ない。また噴射ノズルの噴口を含む先端部を油密
に閉塞する手段として第７図に示す実施例に限る
ものではなく、噴射ノズル２をノズルホルダ１に
締付けるノズルナツト４の代わりに、内部に噴射
ノズル２の先端乳頭部まで挿入可能で、しかも底
部のある挿入孔をもつ軸部をノズルナツト下端に
連設した形状で、且つ挿入孔底部にＯリングを配
し、このＯリングに噴射ノズル２の先端傾斜面が
油密に当接するように、または噴射ノズル２の先
端に近接の軸部外径に油密に接触するＯリングを
前記挿入孔に挿着した締付けナツトを燃料噴射弁
の初期噴射時の開弁圧調整後ノズルナツト４と交
換して主噴射の開弁圧測定を行つてもよい。 As described above, according to the method and device for measuring the valve opening pressure of a two-stage fuel injection valve according to the present invention, it is easy to measure the valve opening pressure during main injection at the needle valve lift △l position, which has been difficult in the past. This is effective in improving the accuracy of adjusting the valve opening pressure and increasing the efficiency of the adjustment work. Note that the measurement of the axial displacement of the second push rod is not limited to the dial gauge, and it goes without saying that techniques commonly known as means for measuring the lift amount of a needle valve can be applied. Furthermore, the means for oil-tightly closing the tip of the injection nozzle including the injection port is not limited to the embodiment shown in FIG. The shaft part has an insertion hole with a bottom and is connected to the lower end of the nozzle nut, and an O-ring is arranged at the bottom of the insertion hole. At the time of initial injection of the fuel injection valve, a tightening nut with an O-ring inserted into the insertion hole so that the surfaces are in oil-tight contact or in oil-tight contact with the outer diameter of the shaft near the tip of the injection nozzle 2 is inserted. After adjusting the valve opening pressure, the nozzle nut 4 may be replaced and the valve opening pressure of the main injection may be measured.
第１図は２段噴射型燃料噴射弁の一例を示す縦
断面図、第２図は第１図２段噴射型燃料噴射弁の
先端部詳細図、第３図は本発明による開弁圧調整
装置の取付部の実施例の側面図、第４図は第３図
で示した取付部の平面図、第５図は本発明による
開弁圧調整装置の概略構成図、第６図はダイヤル
ゲージと接触棒を示した図、第７図は第３図の
− 断面図である。
２１：２段噴射型燃料噴射弁、２２：取付部、
２３−１：台板、２３−２：第１の支柱、２４：
支持板、２５：固定ピン、２９：抑え板、３１：
ダイヤルゲージ、３２：接触棒、３３：保持腕、
３７：ブツシユ、３８：閉鎖部材、４０：ノズル
テスタ。
Fig. 1 is a longitudinal sectional view showing an example of a two-stage fuel injection valve, Fig. 2 is a detailed view of the tip of the two-stage fuel injection valve shown in Fig. 1, and Fig. 3 is a valve opening pressure adjustment according to the present invention. FIG. 4 is a plan view of the mounting portion shown in FIG. 3, FIG. 5 is a schematic diagram of the valve opening pressure adjusting device according to the present invention, and FIG. 6 is a dial gauge. Figure 7 shows the contact rod and Figure 3.
- is a cross-sectional view; 21: Two-stage fuel injection valve, 22: Mounting part,
23-1: Base plate, 23-2: First support column, 24:
Support plate, 25: Fixed pin, 29: Holding plate, 31:
Dial gauge, 32: Contact rod, 33: Holding arm,
37: Bush, 38: Closing member, 40: Nozzle tester.
Claims (1)
ルホルダ内に第１押棒を介して針弁を押圧する初
期噴射開弁圧設定用の第１ノズルばねと、第１押
棒の上部にあつて、初期噴射のリフト分の間隙を
おいて設けられた第２押棒を押圧する主噴射開弁
圧設定用の第２ノズルばねとを設け、噴射ノズル
の初期噴射時の針弁リフトにより第１ノズルばね
が圧縮され、次いで主噴射時の針弁リフトにより
第２ノズルばねが第１ノズルばねと共に圧縮され
て主噴射が行われるようにした２段噴射型燃料噴
射弁において、２段噴射型燃料噴射弁と加圧ポン
プとを噴射管で接続し、噴射ノズルの噴口からの
油の流出を止める閉鎖部材を噴口の外部に設けて
噴口側を閉鎖し、前記第２押棒の軸方向変位と、
前記噴射管の管内圧力とを同時に検出することに
より、主噴射時の開弁圧を測定することを特徴と
する２段噴射型燃料噴射弁の開弁圧測定方法。 ２ 上面に噴射ノズルの噴口外部を密閉する閉鎖
部材を設けて成る台板と、この台板の上面に固着
された第１の支柱と、この第１の支柱に一端側で
上下方向の移動を可能に係合し他端側で２段噴射
型燃料噴射弁を挿通支持する支持板と、この支持
板の中央部に設けた第２の支柱を介して係合支持
され且つ２段噴射型燃料噴射弁をこの支持板に固
定する抑え板と、２段噴射型燃料噴射弁の主噴射
開弁圧設定用の第２ノズルばねに押圧される第２
押棒の軸方向変位を検出する変位測定器を保持す
る保持腕を係合する第３の支柱とからなる取付部
と油槽、加圧ポンプ及び圧力計とを一体的に備え
たノズルテスタと前記取付部に装着される２段噴
射型燃料噴射弁とを噴射管で接続するように構成
したことを特徴とする２段噴射型燃料噴射弁の開
弁圧測定装置。 ３ 第２押棒の軸方向変位を検出する変位測定器
はダイヤルゲージより成ることを特徴とする特許
請求の範囲第２項記載の２段噴射型燃料噴射弁の
開弁圧測定装置。[Claims] 1. Consisting of an injection nozzle and a nozzle holder, a first nozzle spring for setting the initial injection valve opening pressure that presses the needle valve via a first push rod in the nozzle holder, and an upper part of the first push rod. In this case, a second nozzle spring for setting the main injection valve opening pressure is provided, which presses a second push rod provided with a gap equal to the lift of the initial injection, and the needle valve lift at the initial injection of the injection nozzle presses the second push rod. In a two-stage injection type fuel injection valve, the first nozzle spring is compressed, and then the second nozzle spring is compressed together with the first nozzle spring by the needle valve lift during main injection to perform main injection. A type fuel injection valve and a pressurizing pump are connected through an injection pipe, and a closing member is provided outside the injection nozzle to stop oil from flowing out from the injection nozzle to close the injection nozzle side, and the second push rod is displaced in the axial direction. and,
A method for measuring valve opening pressure of a two-stage fuel injection valve, characterized in that the valve opening pressure during main injection is measured by simultaneously detecting the internal pressure of the injection pipe. 2. A base plate provided with a closing member on the upper surface for sealing the outside of the injection nozzle, a first support column fixed to the upper surface of the base plate, and a vertical movement movable member on one end of the first support plate. A support plate that can be engaged with the other end of the two-stage fuel injector and that supports the two-stage fuel injection valve through the support plate; A restraining plate that fixes the injection valve to this support plate, and a second nozzle spring that is pressed by a second nozzle spring for setting the main injection valve opening pressure of the two-stage fuel injection valve.
A nozzle tester integrally equipped with a third column that engages a holding arm that holds a displacement measuring device that detects displacement in the axial direction of a push rod, an oil tank, a pressure pump, and a pressure gauge, and the mounting section. 1. A valve opening pressure measuring device for a two-stage fuel injection valve, characterized in that it is configured to be connected to a two-stage fuel injection valve mounted on the fuel injection valve through an injection pipe. 3. The valve opening pressure measuring device for a two-stage fuel injection valve according to claim 2, wherein the displacement measuring device for detecting the axial displacement of the second push rod is a dial gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4751581A JPS57163152A (en) | 1981-03-31 | 1981-03-31 | Valve opening pressure measuring method and device for two stage valve opening pressure type fuel injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4751581A JPS57163152A (en) | 1981-03-31 | 1981-03-31 | Valve opening pressure measuring method and device for two stage valve opening pressure type fuel injection valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57163152A JPS57163152A (en) | 1982-10-07 |
| JPS6211180B2 true JPS6211180B2 (en) | 1987-03-11 |
Family
ID=12777241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4751581A Granted JPS57163152A (en) | 1981-03-31 | 1981-03-31 | Valve opening pressure measuring method and device for two stage valve opening pressure type fuel injection valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57163152A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3825832A1 (en) * | 1988-07-29 | 1990-02-01 | Bosch Gmbh Robert | Method for checking the second opening pressure of a double spring nozzle-and-holder assembly |
| KR20030015458A (en) * | 2001-08-14 | 2003-02-25 | 현대자동차주식회사 | Nozzle free lift determination method of fuel injection valve |
-
1981
- 1981-03-31 JP JP4751581A patent/JPS57163152A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57163152A (en) | 1982-10-07 |
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