JPH0244053Y2 - - Google Patents
Info
- Publication number
- JPH0244053Y2 JPH0244053Y2 JP1984111795U JP11179584U JPH0244053Y2 JP H0244053 Y2 JPH0244053 Y2 JP H0244053Y2 JP 1984111795 U JP1984111795 U JP 1984111795U JP 11179584 U JP11179584 U JP 11179584U JP H0244053 Y2 JPH0244053 Y2 JP H0244053Y2
- Authority
- JP
- Japan
- Prior art keywords
- control valve
- fuel
- pressure control
- injection
- communication
- 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 53
- 239000007924 injection Substances 0.000 claims description 53
- 239000000446 fuel Substances 0.000 claims description 38
- 238000005086 pumping Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
【考案の詳細な説明】
産業上の利用分野
本考案はデイーゼルエンジン等内燃機関の燃料
噴射サイクルを安定させるために用いる、燃料噴
射ポンプの残圧制御弁の構造に関する。[Detailed Description of the Invention] Industrial Application Field The present invention relates to the structure of a residual pressure control valve of a fuel injection pump used to stabilize the fuel injection cycle of an internal combustion engine such as a diesel engine.
従来の技術
従来、内燃機関の燃料噴射ポンプの燃料圧送室
から燃料噴射管及び燃料噴射ノズルに至る燃料噴
射系路の高圧反射波による不整噴射を防止する目
的で、燃料噴射後に噴射径路の残留圧力を制御す
る残圧制御弁が提案されている。（たとえば実開
昭56−4654号、実開昭56−83659号）。Conventionally, in order to prevent irregular injection due to high-pressure reflected waves in the fuel injection system from the fuel feeding chamber of the fuel injection pump of the internal combustion engine to the fuel injection pipe and fuel injection nozzle, residual pressure in the injection path after fuel injection has been used. A residual pressure control valve has been proposed. (For example, Utility Model Application No. 56-4654, Utility Model Application No. 56-83659).
第２図は、その従来技術による残圧制御弁の構
成を示すもので、分配型噴射ポンプの一部断面を
表めしている。噴射ポンプ６０にはシリンダ６２
があり、これに摺動可能にニードル６１が挿入さ
れる。シリンダ６２の右端面にはプラグ６４がヘ
ツド６３を介して固定され、シリンダ６２、プラ
ンジヤ６１及びプラグ６４で燃料圧送室７０が形
成される。又、残圧制御弁７５は、シリンダ７８
とこれに当接挿入される弁本体７９から成り、ス
プリング８０で弁本体７９がシリンダ７８の上端
に付勢される状態で、ホルダ６５によつて締め付
けられる。弁本体７９内にはチエツクボール７６
が挿入され、連通路８２を閉塞するようにスプリ
ング７７で付勢される。次に上記従来残圧制御弁
の動作を説明する。 FIG. 2 shows the configuration of a residual pressure control valve according to the prior art, and shows a partial cross section of a distribution type injection pump. The injection pump 60 has a cylinder 62
There is a needle 61 slidably inserted into this. A plug 64 is fixed to the right end surface of the cylinder 62 via a head 63, and the cylinder 62, plunger 61, and plug 64 form a fuel pumping chamber 70. Further, the residual pressure control valve 75 is connected to the cylinder 78.
and a valve body 79 which is inserted into contact therewith, and is tightened by the holder 65 while the valve body 79 is urged against the upper end of the cylinder 78 by a spring 80. There is a check ball 76 inside the valve body 79.
is inserted and urged by the spring 77 to close the communication path 82. Next, the operation of the conventional residual pressure control valve will be explained.
噴射前のサイクルにおいて、燃料は連通路６７
及び６８を通つてプランジヤ６１の連通溝６９に
入り、燃料圧送室７０に充満する。次に、噴射サ
イクルに入ると、プランジヤ６１は図示しないカ
ムにより図中右方向に押込まれ、燃料圧送室７０
内の燃料の容積を縮小し、その圧力を徐々に高
め、連通路７１、連通溝７２、連通路７３及び７
４にも伝達される。すると、残圧制御弁７５の弁
本体７９は、スプリング８０に反して、シリンダ
７８内を上昇し、連通路８３へ燃料を流入させる
と共に、吐出口８１から図示しない噴射管を経由
して、噴射ノズルへ供給する。次で、噴射が終了
してプランジヤ６１が図中左方向へ移動すると、
燃料圧送室７０の圧力が下降し、残圧制御弁７５
の弁本体７９は、スプリング８０の付勢力と、噴
射径路の圧力差によつて、シリンダ７８に押し付
けられ、ホルダ６５の連通路８３とヘツド６３の
連通路７４を遮断する。しかし、スプリング７７
の付勢力よりも連通路８３中の圧力が高い場合
は、連通路８２を通してチエツクボール７６を押
し下げ、連通路８４を介して連通路７４へ燃料が
流れ続け、連通路８３側の噴射系路の噴射残留圧
力が充分に低められ、噴射径路が安定し不整噴射
が防止される。 In the pre-injection cycle, fuel flows through the communication path 67.
and 68, enters the communication groove 69 of the plunger 61, and fills the fuel pumping chamber 70. Next, when entering the injection cycle, the plunger 61 is pushed rightward in the figure by a cam (not shown), and the fuel pressure chamber 70
The volume of the fuel inside is reduced and its pressure is gradually increased, and the communication passage 71, the communication groove 72, the communication passage 73 and the
4 is also transmitted. Then, the valve body 79 of the residual pressure control valve 75 rises in the cylinder 78 against the spring 80, causing fuel to flow into the communication passage 83 and injecting fuel from the discharge port 81 via an injection pipe (not shown). Supply to the nozzle. Next, when the injection ends and the plunger 61 moves to the left in the figure,
The pressure in the fuel feeding chamber 70 decreases, and the residual pressure control valve 75
The valve body 79 is pressed against the cylinder 78 by the biasing force of the spring 80 and the pressure difference in the injection path, and blocks the communication path 83 of the holder 65 and the communication path 74 of the head 63. However, spring 77
If the pressure in the communication passage 83 is higher than the urging force of The injection residual pressure is sufficiently lowered, the injection path is stabilized, and irregular injection is prevented.
考案が解決しようとする問題点
しかしながら、これら従来より提案される残圧
制御弁は、図からも理解できるように、通常、残
圧制御弁７５の弁本体７９をシリンダ７８に向け
て付勢するスプリング８０と、弁本体７９に挿入
される連通路８２を閉塞するチエツクボールを付
勢するスプリング７７が必要であり、構造が複雑
であることと、前記スプリング８０及び７７を収
納するスペースを要することとなり、噴射径路の
無駄空間を増大させ、噴射系全体を不安定にする
と共に、弁本体が大型化するという欠点があつ
た。Problems to be Solved by the Invention However, as can be seen from the figure, in these conventionally proposed residual pressure control valves, the valve body 79 of the residual pressure control valve 75 is normally biased toward the cylinder 78. The spring 80 and the spring 77 that biases the check ball that closes the communication path 82 inserted into the valve body 79 are required, and the structure is complicated and a space is required to accommodate the springs 80 and 77. This increases the waste space in the injection path, destabilizes the entire injection system, and increases the size of the valve body.
本考案は、係る欠点に対して、燃料噴射残圧を
制御しうる機能をそこなうことなく、小型かつ簡
単な構造で、噴射径路中の無駄空間の減少を達成
し、安定な噴射サイクルを得ることができる噴射
ポンプの残圧制御弁を提供することを目的とす
る。 The present invention addresses these drawbacks by achieving a reduction in wasted space in the injection path and obtaining a stable injection cycle with a small and simple structure without impairing the function of controlling the fuel injection residual pressure. The purpose of this invention is to provide a residual pressure control valve for an injection pump that can
問題点を解決するための手段
この目的に沿う本考案の燃料噴射ポンプの圧力
制御弁は、燃料噴射ポンプの燃料圧送室出口に、
相対する二平面と前記二平間を連通する通路と前
記通路を特定の圧力で開閉することが可能な弾性
体で構成された弁を設けたものから成る。Means for Solving the Problem The pressure control valve of the fuel injection pump of the present invention that meets this purpose has a pressure control valve at the outlet of the fuel pumping chamber of the fuel injection pump.
It consists of two opposing planes, a passage communicating between the two planes, and a valve made of an elastic body that can open and close the passage at a specific pressure.
実施例 本考案の実施例を図で説明する。Example An embodiment of the present invention will be explained using figures.
第１図は本考案による実施例の拡大断面図であ
り、残圧制御弁１は、インナケース３をつつむア
ウタケース２と、前記インナ、アウタケース２，
３によつて収納される弾性体６から構成される。
インナケース３には連通口４が、アウタケース２
には連通口５がそれぞれ開口すると共に、アウタ
ケース２はインナケース３にかしめ部８によつて
固着密封される。又、弾性体の中心部は、それぞ
れ円弧を押し付けた如くの密着面７に成つてお
り、通常の場合、連通口５と連通口５は、この密
着面７によつてそれぞれ遮断されているが、どち
らかに連通口に圧力が加わると弾性体が変形し、
密着面が開放され、それぞれの連通口が連通され
る。尚、この場合の弾性体はゴム材などを使用す
るものとする。 FIG. 1 is an enlarged cross-sectional view of an embodiment of the present invention, in which the residual pressure control valve 1 includes an outer case 2 enclosing an inner case 3, the inner case 2, the outer case 2, and the outer case 2.
It is composed of an elastic body 6 housed by 3.
The inner case 3 has a communication port 4, and the outer case 2
A communication port 5 is opened at each side, and the outer case 2 is fixed and sealed to the inner case 3 by a caulking portion 8. In addition, the center of the elastic body is formed into a contact surface 7 that looks like a pressed circular arc, and in normal cases, the communication port 5 and the communication port 5 are each blocked by this contact surface 7. When pressure is applied to either communication port, the elastic body deforms,
The contact surface is opened and the respective communication ports are communicated with each other. Note that the elastic body in this case is made of a rubber material or the like.
次に、実際の噴射ポンプへ取付けた状態でその
作用を説明する。第３図は分配型噴射ポンプ６０
に使用した例を示すもので、噴射ポンプの一部断
面形状を示す。噴射ポンプ６０は、シリンダ６１
と、これに摺動可能に挿入されたプランジヤ６１
と、前記シリンダ６２と図中右方向端面に当接す
るようにヘツド６３を介して取り付けられるプラ
グ６４などから構成される。又、残圧制御弁１
は、ヘツド６３とホルダ１００の間に収納され、
両間をわずかに移動するように組込まれる。燃料
が連通路６７から入ると、連通路６８、連通溝６
９を通つて、燃料圧送室７０に充満する。噴射ポ
ンプ６０が噴射サイクルに入ると、図示しないカ
ムによつてプランジヤ６１が図中右方向に押し込
まれ、燃料圧送室７０の燃料を圧縮して、次第に
圧力を上昇させる。この時、連通路７１、連通溝
７２、連通路７３、連通路７４を通つて、残圧制
御弁１にも圧力が伝えられ、残圧制御弁１は、ホ
ルダ１００の段部１０１に当接するまで移動し、
連通路１０５を開放する。この時、ホルダ１００
は、第４図に示すＡ−Ａ断面図の如く、連通路１
０２の周囲に複数個のバイパス路１０４を有して
いるので、燃料は連通路１０５からバイパス路１
０４を通つて、連通路１０２に流入し、吐出口１
０３から図示しない噴射管から、図示しない噴射
ノズルに供給され、燃料が噴射される。次で、噴
射サイクルが終了して、プランジヤ６１が図中左
方向に戻ると、燃料圧送室７０内の圧力は次第に
下降し、連通の関係にある連通路１０５の圧力も
下降する。すると、いままでホルダ１００の段部
１０１に当接していた残圧制御弁１は再びヘツド
６３に当接し、連通路１０５を遮断する。しか
し、連通路１０２内の圧力は、連通路１０５内の
圧力よりも高いので、残圧制御弁１の密着面７の
密着圧力に打ち勝つて、前記密着圧力にバランス
するまで、連通路１０２から連通路１０５に向つ
て燃料が流れることとなり、吐出口１０３から図
示しない噴射管及び図示しない噴射ノズルを含む
噴射径路全体の残留圧力を充分に低い圧力に制御
される。 Next, its operation will be explained with the device attached to an actual injection pump. Figure 3 shows a distribution type injection pump 60.
This shows an example in which the injection pump was used, and shows a partial cross-sectional shape of the injection pump. The injection pump 60 has a cylinder 61
and a plunger 61 slidably inserted therein.
The plug 64 is attached via a head 63 so as to come into contact with the cylinder 62 and the right end face in the figure. Also, residual pressure control valve 1
is stored between the head 63 and the holder 100,
It is incorporated so that it moves slightly between the two. When fuel enters from the communication passage 67, the communication passage 68 and the communication groove 6
9 and fills the fuel pumping chamber 70. When the injection pump 60 enters the injection cycle, the plunger 61 is pushed rightward in the figure by a cam (not shown), compressing the fuel in the fuel pumping chamber 70 and gradually increasing the pressure. At this time, the pressure is also transmitted to the residual pressure control valve 1 through the communication path 71, the communication groove 72, the communication path 73, and the communication path 74, and the residual pressure control valve 1 comes into contact with the stepped portion 101 of the holder 100. move to
The communication path 105 is opened. At this time, holder 100
As shown in the A-A sectional view shown in Fig. 4, the communication path 1
Since there are a plurality of bypass passages 104 around the bypass passage 102, the fuel flows from the communication passage 105 to the bypass passage 1.
04, flows into the communication path 102, and the discharge port 1
03, the fuel is supplied from an injection pipe (not shown) to an injection nozzle (not shown), and the fuel is injected. Next, when the injection cycle ends and the plunger 61 returns to the left in the figure, the pressure in the fuel pumping chamber 70 gradually decreases, and the pressure in the communicating passage 105 that is in communication also decreases. Then, the residual pressure control valve 1, which has been in contact with the stepped portion 101 of the holder 100, comes into contact with the head 63 again, and the communication path 105 is cut off. However, since the pressure in the communication passage 102 is higher than the pressure in the communication passage 105, the pressure in the communication passage 102 overcomes the contact pressure of the contact surface 7 of the residual pressure control valve 1, and continues from the communication passage 102 until the contact pressure is balanced with the contact pressure. The fuel flows toward the passage 105, and the residual pressure in the entire injection path including the injection pipe (not shown) and the injection nozzle (not shown) from the discharge port 103 is controlled to a sufficiently low pressure.
第５図、第６図は、本考案の他の実施例を示す
ものである。まず第５図は、１枚のプレート２１
を弾性体２３で構成される残圧制御弁２０で、弾
性体２３で平面を形成するものである。尚、プレ
ート２１には連通口２２が開口すると共に、弾性
体２３をかしめ部２５で圧着固定しつつ密着面２
４を形成するようにしている。従つてかしめ部２
５の圧着力によつて密着面２４の密着力を変化
し、制御される圧力を任意に設定することが可能
となる。 5 and 6 show other embodiments of the present invention. First, Figure 5 shows one plate 21
The residual pressure control valve 20 is composed of an elastic body 23, and the elastic body 23 forms a plane. Note that the plate 21 has a communication port 22 opened therein, and the elastic body 23 is crimped and fixed by the caulking part 25 while the contact surface 2 is opened.
I try to form 4. Therefore, caulking part 2
The adhesion force of the adhesion surface 24 can be changed by the pressure force of No. 5, and the pressure to be controlled can be arbitrarily set.
第６図は弾性体４２を周囲からリング４１で締
め付ける構造とした残圧制御弁４０を示すもの
で、第５図同様、密着面４３の密着力をリング４
１の締め付け力で調整できると共に、非常に簡単
な構造にすることが可能である。 FIG. 6 shows a residual pressure control valve 40 having a structure in which an elastic body 42 is tightened from the circumference by a ring 41. Similar to FIG. 5, the adhesion force of the contact surface 43 is
The tightening force can be adjusted with a tightening force of 1, and the structure can be made very simple.
尚、上記第５図、第６図の実施例における作用
は第３図で説明した内容と何ら変らないので省略
する。 It should be noted that the operations in the embodiments shown in FIGS. 5 and 6 are the same as those explained in FIG. 3, and will therefore be omitted.
考案の効果
以上説明したように、本考案によれば、弾性体
の密着力によるという非常に簡単な構造で、確実
に噴射径路の噴射残留圧力を、充分に抵く制御す
ることが可能になると共に、小型に構成できるこ
とによる噴射径路全体の無駄空間を少くし、噴射
をより安定に行なうことができる。さらに、製造
コストも安価にできる効果がある。Effects of the invention As explained above, according to the invention, it is possible to reliably control the injection residual pressure in the injection path to a sufficient extent with a very simple structure based on the adhesion force of the elastic body. At the same time, since the structure can be made compact, the wasted space of the entire injection path can be reduced, and injection can be performed more stably. Furthermore, the manufacturing cost can also be reduced.
第１図は本考案燃料噴射ポンプの圧力制御弁に
係る一実施例の拡大断面図、第２図は従来技術の
燃料噴射ポンプの圧力制御弁の断面図、第３図は
第２図の実施例を実際の噴射ポンプに応用した例
を示す断面図、第４図は第３図の切断線Ａ−Ａに
沿つた断面図、第５図、第６図はそれぞれ本考案
の他の実施例に係る燃料噴射ポンプの圧力制御弁
の拡大断面図である。
１……残圧制御弁、２……アウタケース、３…
…インナケース、４，５……連通口、６……弾性
体、７……密着面、８……かしめ部、２０……残
圧制御弁、２１……プレート、２２……連通口、
２３……弾性体、２４……密着面、４０……残圧
制御弁、４１……リング、４２……弾性体、４３
……密着面、６０……噴射ポンプ、６１……プラ
ンジヤ、６２……シリンダ、６３……ヘツド、６
４……プラグ、６５……ホルダ、６６……ガスケ
ツト、６７，６８……連通路、６９……連通溝、
７０……燃料圧送室、７１……連通路、７２……
連通溝、７３，７４……連通路、７５……残圧制
御弁、７６……チエツクボール、７７……スプリ
ング、７８……シリンダ、７９……弁本体、８０
……スプリング、８１……吐出口、８２，８３，
８４……連通路、８５……スピルリング、１００
……ホルダ、１０１……段部、１０２……連通
路、１０３……吐出口、１０４……バイパス路、
１０５……連通路。
FIG. 1 is an enlarged cross-sectional view of one embodiment of the pressure control valve of the fuel injection pump of the present invention, FIG. 2 is a cross-sectional view of the pressure control valve of the conventional fuel injection pump, and FIG. 3 is an implementation of the pressure control valve of the fuel injection pump of the present invention. A sectional view showing an example in which the example is applied to an actual injection pump, FIG. 4 is a sectional view taken along the cutting line A-A in FIG. 3, and FIGS. 5 and 6 are other embodiments of the present invention, respectively. It is an enlarged sectional view of the pressure control valve of the fuel injection pump concerning this. 1... Residual pressure control valve, 2... Outer case, 3...
... Inner case, 4, 5 ... Communication port, 6 ... Elastic body, 7 ... Close contact surface, 8 ... Caulking part, 20 ... Residual pressure control valve, 21 ... Plate, 22 ... Communication port,
23... Elastic body, 24... Close contact surface, 40... Residual pressure control valve, 41... Ring, 42... Elastic body, 43
...Tight surface, 60...Injection pump, 61...Plunger, 62...Cylinder, 63...Head, 6
4...Plug, 65...Holder, 66...Gasket, 67, 68...Communication path, 69...Communication groove,
70...Fuel pressure feeding chamber, 71...Communication passage, 72...
Communication groove, 73, 74... Communication path, 75... Residual pressure control valve, 76... Check ball, 77... Spring, 78... Cylinder, 79... Valve body, 80
... Spring, 81 ... Discharge port, 82, 83,
84... Communication path, 85... Spill ring, 100
... Holder, 101 ... Stepped portion, 102 ... Communication path, 103 ... Discharge port, 104 ... Bypass path,
105...Communication path.
Claims (1)
路を郭定する面を有する環状弾性体からなり前記
面にかかる圧力が特定の圧力より小のときは前記
面は密着していて通路が閉となり前記面にかかる
圧力が特定の圧力以上で前記密着面が離れて通路
が開となる弁を設けたことを特徴とする燃料噴射
ポンプの圧力制御弁。 An annular elastic body is provided at the outlet of the fuel feeding chamber of the fuel injection pump and has a surface defining a passage on the inside, and when the pressure applied to the surface is lower than a specific pressure, the surface is in close contact and the passage is closed. A pressure control valve for a fuel injection pump, characterized in that the pressure control valve for a fuel injection pump is provided with a valve that separates the contact surface and opens a passage when the pressure applied to the surface exceeds a specific pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11179584U JPS6127966U (en) | 1984-07-25 | 1984-07-25 | Fuel injection pump pressure control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11179584U JPS6127966U (en) | 1984-07-25 | 1984-07-25 | Fuel injection pump pressure control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6127966U JPS6127966U (en) | 1986-02-19 |
| JPH0244053Y2 true JPH0244053Y2 (en) | 1990-11-22 |
Family
ID=30670869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11179584U Granted JPS6127966U (en) | 1984-07-25 | 1984-07-25 | Fuel injection pump pressure control valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6127966U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS564654B2 (en) * | 1975-07-28 | 1981-01-31 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5554567U (en) * | 1978-10-09 | 1980-04-12 | ||
| JPS564654U (en) * | 1979-06-22 | 1981-01-16 |
-
1984
- 1984-07-25 JP JP11179584U patent/JPS6127966U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS564654B2 (en) * | 1975-07-28 | 1981-01-31 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6127966U (en) | 1986-02-19 |
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