JP2534947Y2 - Fuel pump residual pressure holding valve - Google Patents
Fuel pump residual pressure holding valveInfo
- Publication number
- JP2534947Y2 JP2534947Y2 JP1427691U JP1427691U JP2534947Y2 JP 2534947 Y2 JP2534947 Y2 JP 2534947Y2 JP 1427691 U JP1427691 U JP 1427691U JP 1427691 U JP1427691 U JP 1427691U JP 2534947 Y2 JP2534947 Y2 JP 2534947Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- spring
- fuel pump
- residual pressure
- pressure holding
- 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 - Lifetime
Links
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- Details And Applications Of Rotary Liquid Pumps (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、燃料ポンプの吐出口に
設けられ、該吐出口に接続された燃料配管内の残圧を保
持する燃料ポンプの残圧保持弁に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a residual pressure holding valve for a fuel pump which is provided at a discharge port of a fuel pump and retains a residual pressure in a fuel pipe connected to the discharge port.
【０００２】[0002]
【従来の技術】図２ないし図５に従来技術による燃料ポ
ンプとして、タービン型の燃料ポンプを例に挙げて示
す。2. Description of the Related Art FIGS. 2 to 5 show a turbine type fuel pump as an example of a conventional fuel pump.
【０００３】図において、１は燃料タンク（図示せず）
に設けられ、筒状のケーシング本体２内にモータ部３と
ポンプ部４とを内蔵したタービン型の燃料ポンプで、該
燃料ポンプ１には、ケーシング本体２の下端側に設けら
れ、燃料タンク内の燃料を吸込む吸込口２Ａと、ケーシ
ング本体２の上端側を施蓋して設けられた繊維強化樹脂
材料からなる上カバー２Ｂに一体的に設けられ、該吸込
口２Ａからケーシング本体２内に吸込んだ燃料を後述の
吐出配管１１側に吐出する吐出口２Ｃとが設けられ、該
吐出口２Ｃ内には後述の残圧保持弁６が設けられてい
る。そして、該燃料ポンプ１は、コントロールユニット
（図示せず）からの給電によってモータ部３が回転駆動
すると、燃料タンク内の燃料をフィルタ５を介して吸込
口２Ａからポンプ部４内に吸込み、この燃料を吐出口２
Ｃから残圧保持弁６を介して吐出配管１１側に吐出す
る。In the drawing, reference numeral 1 denotes a fuel tank (not shown)
And a turbine type fuel pump having a motor unit 3 and a pump unit 4 built in a cylindrical casing body 2. The fuel pump 1 is provided at the lower end side of the casing body 2, And an upper cover 2B made of a fiber reinforced resin material provided by covering the upper end side of the casing body 2 and sucking the fuel into the casing body 2 from the inlet port 2A. A discharge port 2C for discharging the fuel to the discharge pipe 11 described later is provided, and a residual pressure holding valve 6 described later is provided in the discharge port 2C. When the motor unit 3 is driven to rotate by power supply from a control unit (not shown), the fuel pump 1 sucks the fuel in the fuel tank from the suction port 2A into the pump unit 4 through the filter 5, and Fuel outlet 2
C discharges through the residual pressure holding valve 6 to the discharge pipe 11 side.
【０００４】６はケーシング本体２の吐出口２Ｃ内に設
けられた残圧保持弁を示し、該残圧保持弁６は図３、図
４に示す如く、吐出口２Ｃ内に形成された弁室７と、該
弁室７の上流側（底部側）を縮径して形成された弁座８
と、弁室７内に設けられ、燃料の吐出圧力によって軸方
向に変位して吐出口２Ｃを開，閉弁するＮＢＲ等のゴム
材料からなる弁体９と、弁室７内に取付けられ、該弁体
９を軸方向に摺動可能に支持する弁体支持部材としての
弁ガイド１０とから構成されている。Reference numeral 6 denotes a residual pressure holding valve provided in the discharge port 2C of the casing body 2, and the residual pressure holding valve 6 is a valve chamber formed in the discharge port 2C as shown in FIGS. And a valve seat 8 formed by reducing the diameter of the upstream side (bottom side) of the valve chamber 7.
A valve body 9 made of a rubber material such as NBR, which is provided in the valve chamber 7 and is axially displaced by the discharge pressure of fuel to open and close the discharge port 2C, and is mounted in the valve chamber 7; A valve guide 10 serving as a valve body support member for supporting the valve body 9 so as to be slidable in the axial direction.
【０００５】ここで、前記弁体９は、図４に示す如く弁
座８に離着座する半球状の弁部９Ａと、該弁部９Ａの上
面側から弁室７内を軸方向に伸長して一体的に形成され
た弁軸９Ｂとから構成されている。そして、該弁体９
は、モータ部３の停止時に、吐出配管１１に接続された
燃料配管（図示せず）内に残存する燃料によって下向き
に押圧されると、該弁体９の弁部９Ａが弁座８に、その
先端面を復元可能な範囲でわずかに弾性変形させて着座
することにより閉弁し、燃料配管内の燃料の圧力（残
圧）を保持するようになっている。また、前記弁ガイド
１０は吐出口２Ｃの内周側に固着された大径筒状の固定
筒部１０Ａと、該固定筒部１０Ａの底部側中央から下向
きに突出形成され、弁体９の弁軸９Ｂが挿通されること
により、該弁体９を軸方向に摺動可能に支持する小径筒
状のガイド筒部１０Ｂ等とから構成されている。As shown in FIG. 4, the valve body 9 has a hemispherical valve portion 9A which is separated from and seated on a valve seat 8, and extends axially in the valve chamber 7 from the upper surface side of the valve portion 9A. And a valve shaft 9B integrally formed. And the valve element 9
When the motor portion 3 is stopped, when the fuel remaining in a fuel pipe (not shown) connected to the discharge pipe 11 is pressed downward, the valve portion 9A of the valve body 9 is attached to the valve seat 8, The valve is closed by slightly elastically deforming the distal end surface of the fuel pipe within a restorable range and seating the valve, thereby closing the valve and maintaining the pressure (residual pressure) of the fuel in the fuel pipe. The valve guide 10 has a large-diameter cylindrical fixed cylindrical portion 10A fixed to the inner peripheral side of the discharge port 2C, and is formed so as to project downward from the center of the bottom of the fixed cylindrical portion 10A. The shaft 9B is configured to include a small-diameter cylindrical guide tube portion 10B that supports the valve body 9 so as to be slidable in the axial direction when the shaft 9B is inserted.
【０００６】１１は吐出口２Ｃの上側に設けられた吐出
配管、１２は該吐出配管１１と吐出口２Ｃとを接続する
接続ホースを示し、該接続ホースの両端部はホースバン
ド１３，１３により締着されている。また、該吐出配管
１１の先端部１１Ａには燃料ポンプ１の保管、運搬中に
外部から粉塵等が侵入するのを防止する防塵キャップ１
４が取付けられている。Reference numeral 11 denotes a discharge pipe provided above the discharge port 2C, 12 denotes a connection hose for connecting the discharge pipe 11 and the discharge port 2C, and both ends of the connection hose are fastened by hose bands 13 and 13. Is being worn. Further, a dustproof cap 1 for preventing dust or the like from entering from outside during storage and transportation of the fuel pump 1 is provided at a tip 11A of the discharge pipe 11.
4 are attached.
【０００７】従来技術による燃料ポンプ１は上述の如き
構成を有するもので、外部からの給電によってモータ部
３は回転駆動し、該モータ部３によってポンプ部４内の
タービン（図示せず）が回転駆動され、これにより燃料
タンク内の燃料は、吸込口２Ａからケーシング本体２内
へ吸込まれつつ、ケーシング本体２内から吐出口２Ｃ、
残圧保持弁６を介して吐出配管１１内に吐出され、該吐
出配管１１を介して燃料配管内へ送り出される。The fuel pump 1 according to the prior art has the above-described structure. The motor unit 3 is driven to rotate by external power supply, and the motor unit 3 rotates a turbine (not shown) in the pump unit 4. As a result, the fuel in the fuel tank is sucked into the casing body 2 from the suction port 2A, and is discharged from the casing body 2 to the discharge port 2C,
It is discharged into the discharge pipe 11 via the residual pressure holding valve 6 and sent out through the discharge pipe 11 into the fuel pipe.
【０００８】そして、燃料ポンプ１が停止して燃料噴射
装置側への燃料の供給が止まり、ケーシング本体２内の
圧力が燃料ポンプの吐出圧力（約０．７ｋｇ／ｃｍ2）
よりも低下すると、残圧保持弁６は燃料配管内の背圧に
より、弁体９の弁部９Ａをわずかに弾性変形させつつ弁
座８に着座させて閉弁し、これにより、燃料配管内の圧
力を約０．７ｋｇ／ｃｍ2程度に保持して該燃料配管内
に燃料を確保し、エンジンの再始動に備える。Then, the fuel pump 1 stops and the supply of fuel to the fuel injection device side stops, and the pressure in the casing body 2 becomes the discharge pressure of the fuel pump (about 0.7 kg / cm 2 ).
When the pressure drops further, the residual pressure holding valve 6 is seated on the valve seat 8 and closed, while slightly deforming the valve portion 9A of the valve body 9 by the back pressure in the fuel pipe. Is maintained at about 0.7 kg / cm 2 to secure fuel in the fuel pipe and prepare for restart of the engine.
【０００９】さて、前述の燃料ポンプ１は工場での製造
段階において、製品として組立てた後、品質管理のため
に灯油等のテスト燃料を用いて動作テストが行われる。
そして、動作テスト完了後、ケーシング本体２および吐
出配管１１内のテスト燃料が取り除かれ、吐出配管１１
の先端部１１Ａに防塵キャップ１４が取付けられた後、
出荷される。The fuel pump 1 described above is assembled as a product at a manufacturing stage in a factory, and then subjected to an operation test using a test fuel such as kerosene for quality control.
After the operation test is completed, the test fuel in the casing body 2 and the discharge pipe 11 is removed, and the discharge pipe 11
After the dustproof cap 14 is attached to the tip 11A of the
Will be shipped.
【００１０】[0010]
【考案が解決しようとする課題】ところで、上述した従
来技術によるものでは、品質管理のためにテスト燃料を
用いて燃料ポンプ１の動作テストを行っているが、動作
テストに使用したテスト燃料を完全に除去するのは難し
く、ケーシング本体２内や吐出配管１１内にテスト燃料
が残存してしまう。この結果、燃料ポンプ１を、図２に
示す如く、防塵キャップ１４を取付けた状態で高温な場
所に保管していると、残圧保持弁６と防塵キャップ１４
とにより密閉空間となった吐出配管１１内に残存したテ
スト燃料が揮発して、該吐出配管１１内の圧力が異常に
上昇し、この圧力が図４中の矢示Ａ方向から弁体９を閉
弁方向に向けて強く押圧することがある。In the above-mentioned prior art, the operation test of the fuel pump 1 is performed using a test fuel for quality control. However, the test fuel used for the operation test is completely used. The test fuel remains in the casing body 2 and the discharge pipe 11. As a result, when the fuel pump 1 is stored in a high temperature place with the dustproof cap 14 attached as shown in FIG. 2, the residual pressure holding valve 6 and the dustproof cap 14
As a result, the test fuel remaining in the discharge pipe 11 which has become a closed space volatilizes, and the pressure in the discharge pipe 11 abnormally increases, and this pressure causes the valve element 9 to move from the direction indicated by the arrow A in FIG. It may be strongly pressed in the valve closing direction.
【００１１】このため従来技術による燃料ポンプ１で
は、残圧保持弁６が吐出配管１１内の異常圧力によって
押圧され、図５に示す如く、弁体９の弁部９Ａが弁座８
にその先端側が弾性限度を超えて変形しつつ圧入される
という所謂「もぐり込み」現象が発生し、これにより燃
料ポンプ１始動時の吐出圧力で残圧保持弁６を開弁でき
なかったり、弁部９Ａが元の形状に復元できずに変形し
たままになって、閉弁時のシール性が大幅に低下してし
まい、燃料ポンプ１の信頼性が大幅に低下するという問
題がある。For this reason, in the fuel pump 1 according to the prior art, the residual pressure holding valve 6 is pressed by abnormal pressure in the discharge pipe 11, and as shown in FIG.
A so-called "digging-in" phenomenon occurs in which the tip side is pressed while being deformed beyond the elastic limit, whereby the residual pressure holding valve 6 cannot be opened with the discharge pressure at the time of starting the fuel pump 1, or the valve cannot be opened. Since the portion 9A cannot be restored to the original shape and remains deformed, the sealing property at the time of closing the valve is greatly reduced, and the reliability of the fuel pump 1 is greatly reduced.
【００１２】本考案は上述した従来技術の問題に鑑みな
されたもので、本考案は保管、運搬中の温度上昇による
背圧が残圧保持弁に作用した場合でも、残圧保持弁にも
ぐり込み現象が発生するのを防止できるようにした燃料
ポンプを提供することを目的とする。The present invention has been made in view of the above-mentioned problems of the prior art. Even if a back pressure caused by a rise in temperature during storage and transportation acts on the residual pressure holding valve, the present invention penetrates the residual pressure holding valve. It is an object of the present invention to provide a fuel pump capable of preventing occurrence of a phenomenon.
【００１３】[0013]
【課題を解決するための手段】上述した課題を解決する
ために本考案が採用する構成の特徴は、弁体の弁軸先端
側にばね受を設け、該ばね受と弁体支持部材との間に配
設され、基端側が該弁体支持部材に固定され、先端側が
自由端となって該ばね受と微小寸法離間し、または該ば
ね受と当接するばね部材を設けたことにある。To solve the above-mentioned problems, the present invention adopts a feature of the present invention in that a spring bearing is provided at the tip end side of the valve shaft of the valve body, and the spring receiver is connected to the valve body supporting member. There is provided a spring member which is disposed between the base member and the base end side fixed to the valve body support member, and the distal end side is a free end and is separated from the spring receiver by a small dimension or abuts on the spring receiver.
【００１４】[0014]
【作用】上記構成により、燃料配管側に異常背圧が生じ
て残圧保持弁に作用すると、この背圧によって該残圧保
持弁の弁体は閉弁方向に押圧され、弁体支持部材に支持
されつつ弁室内を底部側に向けて変位する。そして、該
弁体が弁室内を微小寸法変位すると、ばね受がばね部材
の先端側に当接するようになり、該弁体が所定寸法以上
下向きに変位するのを防止できる。According to the above construction, when an abnormal back pressure is generated on the fuel pipe side and acts on the residual pressure holding valve, the valve element of the residual pressure holding valve is pressed in the valve closing direction by the back pressure, and the valve body supporting member is pressed. It is displaced toward the bottom in the valve chamber while being supported. Then, when the valve body is displaced by a small dimension in the valve chamber, the spring receiver comes into contact with the distal end side of the spring member, so that the valve body can be prevented from being displaced downward by a predetermined dimension or more.
【００１５】[0015]
【実施例】以下、本考案の実施例を図１に基づいて説明
する。なお、実施例では前述した図２ないし図５に示す
従来技術と同一の構成要素に同一の符号を付し、その説
明を省略するものとする。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the embodiment, the same components as those in the prior art shown in FIGS. 2 to 5 are denoted by the same reference numerals, and description thereof will be omitted.
【００１６】図中、２１は本実施例による残圧保持弁を
示し、該残圧保持弁２１は、従来技術で述べた残圧保持
弁６とほぼ同様に、吐出口２Ｃ内に形成された弁室２２
と、該弁室２２の上流側に形成された弁座２３と、該弁
座２３に当接する弁部２４Ａと該弁部２４Ａの上端側に
形成された弁軸２４Ｂとからなり、ＮＢＲ等のゴム材料
から形成された弁体２４と、弁ガイド２５から大略構成
されているものの、前記弁体２４には後述のばね受２６
が設けられ、前記弁ガイド２５には後述のコイルスプリ
ング２７が取付けられている。In the drawing, reference numeral 21 denotes a residual pressure holding valve according to the present embodiment. The residual pressure holding valve 21 is formed in the discharge port 2C almost similarly to the residual pressure holding valve 6 described in the prior art. Valve chamber 22
And a valve seat 23 formed on the upstream side of the valve chamber 22, a valve portion 24A contacting the valve seat 23, and a valve shaft 24B formed on the upper end side of the valve portion 24A. The valve body 24 is formed of a rubber material and a valve guide 25.
The valve guide 25 is provided with a coil spring 27 described later.
【００１７】ここで、前記弁ガイド２５は吐出口２Ｃの
内周側に固定された固定筒部２５Ａと、該固定筒部２５
Ａの底部側中央から下向きに突出形成され、弁体２４の
弁軸２４Ｂを摺動可能に支持するガイド筒部２５Ｂとか
ら大略構成され、該ガイド筒部２５Ｂの上端内周側に
は、コイルスプリング２７を支持して固定する筒状の支
持部２５Ｃが一体的に設けられている。Here, the valve guide 25 includes a fixed cylindrical portion 25A fixed to the inner peripheral side of the discharge port 2C, and the fixed cylindrical portion 25A.
A is formed substantially downwardly from the center of the bottom side of A, and is substantially constituted by a guide cylinder portion 25B that slidably supports the valve shaft 24B of the valve body 24. A coil is provided on the inner peripheral side of the upper end of the guide cylinder portion 25B. A cylindrical support portion 25C for supporting and fixing the spring 27 is provided integrally.
【００１８】即ち、２６は弁体２４の弁軸２４Ｂの上端
側に設けられたばね受を示し、該ばね受２６は弁軸２４
Ｂに圧入して固定された固定軸２６Ａと、該固定軸２６
Ａの上端側に一体的に形成された平板状のばね受部２６
Ｂとから構成されている。そして、該ばね受２６はばね
受部２６Ｂ下面側とコイルスプリング２７の上端側との
間に、例えば０．０５ｍｍ程度の微小寸法Ｌを確保する
ようにして、固定軸２６Ａが弁体２４の弁軸２４Ｂ内に
圧入して取付けられている。That is, reference numeral 26 denotes a spring bearing provided on the upper end side of the valve shaft 24B of the valve body 24.
B, and a fixed shaft 26A press-fitted into
A flat plate-shaped spring receiving portion 26 integrally formed on the upper end side of A
B. The spring support 26 secures a small dimension L of, for example, about 0.05 mm between the lower surface of the spring support 26B and the upper end of the coil spring 27 so that the fixed shaft 26A It is press-fitted and mounted in the shaft 24B.
【００１９】２７は前記ばね受２６のばね受部２６Ｂと
弁ガイド２５のガイド筒部２５Ｂとの間に配設されたば
ね部材としてのコイルスプリングを示し、該コイルスプ
リング２７の下端側は、弁ガイド２５の支持部２５Ｃに
外嵌されて弁ガイド２５に固定され、上端側は自由端と
なってばね受２６のばね受部２６Ｂ下端面から微小寸法
Ｌだけ離間している。Reference numeral 27 denotes a coil spring as a spring member disposed between the spring receiving portion 26B of the spring receiver 26 and the guide tube portion 25B of the valve guide 25. The lower end of the coil spring 27 has a valve guide. The upper end side is a free end and is separated from the lower end surface of the spring receiving portion 26B of the spring receiver 26 by a minute dimension L.
【００２０】そして、前記コイルスプリング２７は、燃
料ポンプ１の作動停止時に弁体２４が閉弁方向に押圧さ
れて微小寸法Ｌだけ変位した場合には、その上端側がば
ね受２６のばね受部２６Ｂに当接し、これにより弁体２
４の弁部２４Ａが弁座２３に復元可能な範囲で微小変形
しつつ着座して弁部２４Ａと弁座２３との間をシールす
るのを許すと共に、燃料配管側に高温等による異常背圧
が生じて弁体２４が閉弁方向に微小寸法Ｌ以上変位した
場合には、その軸方向上向きのばね力によって弁体２４
をばね受２６を介して開弁方向に付勢し、該弁体２４が
微小寸法Ｌ以上下向きに変位するのを防止するものであ
る。When the valve body 24 is pressed in the valve closing direction and is displaced by a small dimension L when the operation of the fuel pump 1 is stopped, the upper end of the coil spring 27 has a spring receiving portion 26B of the spring receiver 26. To the valve body 2
4 allows the valve portion 24A to be seated while being slightly deformed to the extent that it can be restored to the valve seat 23 to seal between the valve portion 24A and the valve seat 23 and to cause abnormal back pressure due to high temperature or the like on the fuel pipe side. Occurs and the valve body 24 is displaced by a minute dimension L or more in the valve closing direction, the valve body 24 is displaced by its axially upward spring force.
Is biased in the valve-opening direction via a spring receiver 26 to prevent the valve body 24 from being displaced downward by a minute dimension L or more.
【００２１】本実施例による燃料ポンプは上述の如き構
成を有するもので、その基本的動作については従来技術
によるものと格別差異はない。The fuel pump according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.
【００２２】然るに、本実施例では、弁体２４の弁軸２
４Ｂの上端側にばね受２６を設け、該ばね受２６と弁ガ
イド２５のガイド筒部２５Ｂとの間にコイルスプリング
２７を配設し、該コイルスプリング２７は基端側が弁ガ
イド２５の支持部２５Ｃに固定され、先端側が自由端と
なってばね受２６のばね受部２６Ｂの下端面との間に、
閉弁時のシール性を得るために必要な微小寸法Ｌだけ離
間する構成としたから、吐出配管１１内に異常背圧が生
じて弁体２４が閉弁方向に強く押圧され、弁体２４が微
小寸法Ｌ以上変位した場合に、ばね受２６のばね受部２
６Ｂがコイルスプリング２７の自由端に当接し、これに
よりコイルスプリング２７はそのばね力でばね受２６を
介して弁体２４を上向きに付勢し、該弁体２４の弁部２
４Ａが弁座２３に変形しつつ圧入されるのを効果的に防
止できる。この結果、弁体２４の弁部２４Ａが元の形状
に復帰できず異常変形するのを防止して、残圧保持弁２
１に開，閉弁不良等の作動不良が生じるのを効果的に防
止でき、当該燃料ポンプの信頼性や寿命を大幅に向上さ
せることができる。In this embodiment, however, the valve shaft 2 of the valve body 24
4B, a spring receiver 26 is provided on the upper end side, and a coil spring 27 is provided between the spring receiver 26 and the guide cylinder 25B of the valve guide 25. The coil spring 27 has a base end supporting the valve guide 25. 25C, and the distal end side is a free end, between the lower end surface of the spring receiver 26B of the spring receiver 26,
Since it is configured to be separated by a small dimension L necessary to obtain the sealing property at the time of closing the valve, an abnormal back pressure is generated in the discharge pipe 11 and the valve body 24 is strongly pressed in the valve closing direction, and the valve body 24 is pressed. When displaced by the minute dimension L or more, the spring support 2 of the spring support 26
6B abuts against the free end of the coil spring 27, whereby the coil spring 27 urges the valve element 24 upward through the spring support 26 by its spring force, and the valve portion 2 of the valve element 24
4A can be effectively prevented from being pressed into the valve seat 23 while being deformed. As a result, it is possible to prevent the valve portion 24A of the valve body 24 from returning to its original shape and being abnormally deformed.
1 can effectively prevent malfunctions such as poor opening and closing of valves, and can significantly improve the reliability and life of the fuel pump.
【００２３】なお、前記実施例では、ばね受２６は弁体
２４の弁軸２４Ｂに圧入して固定するものとして述べた
が、本考案はこれに限らず、ばね受２６を螺着、接着等
の固着手段を用いて弁体２４に設けてもよく、あるい
は、ばね受を弁軸２４Ｂの先端側に一体形成してもよ
い。In the above-described embodiment, the spring support 26 is described as being press-fitted into the valve shaft 24B of the valve body 24 and fixed. However, the present invention is not limited to this. The fixing means may be provided on the valve body 24, or the spring receiver may be formed integrally with the distal end side of the valve shaft 24B.
【００２４】また、前記実施例では、ばね部材としてコ
イルスプリング２７を用いるものとして述べたが、本考
案はこれに限らず、例えば皿ばね、ゴムばね等の他のば
ね部材を用いてもよい。In the above embodiment, the coil spring 27 is used as the spring member. However, the present invention is not limited to this, and another spring member such as a disc spring or a rubber spring may be used.
【００２５】さらに、前記実施例では、ばね受２６のば
ね受部２６Ｂとコイルスプリング２７の自由端との間
に、０．０５ｍｍ程度の微小寸法を確保するものとして
述べたが、本考案はこれに限らず、例えば燃料ポンプの
吐出圧力が２．５ｋｇ／ｃｍ2のときは微小寸法Ｌを
０．１０ｍｍにすればよく、吐出圧力に対応して微小寸
法Ｌを適宣調節すればよい。また、弁体を金属材料等の
硬質材料から形成し、弁部が弁座に着座するだけでシー
ル性が得られる場合には、微小寸法Ｌを実質的に０とし
てコイルスプリング２７をばね受２６のばね受部２６Ｂ
に当接させる構成としてもよい。Further, in the above-described embodiment, it has been described that a very small dimension of about 0.05 mm is secured between the spring receiving portion 26B of the spring receiver 26 and the free end of the coil spring 27. For example, when the discharge pressure of the fuel pump is 2.5 kg / cm 2, the minute dimension L may be set to 0.10 mm, and the minute dimension L may be appropriately adjusted according to the discharge pressure. When the valve body is formed of a hard material such as a metal material and the sealing performance can be obtained only by the seating of the valve portion on the valve seat, the minute dimension L is set to substantially 0 and the coil spring 27 is set in the spring support 26. Spring receiving portion 26B
May be configured to be brought into contact.
【００２６】一方、前記実施例では、タービン型の燃料
ポンプを例に挙げて説明したが、本考案はこれに限ら
ず、例えばローラベーン型、トロコイド型の燃料ポンプ
等、各種の燃料ポンプにも適用できる。On the other hand, in the above-described embodiment, a turbine type fuel pump has been described as an example. However, the present invention is not limited to this, and may be applied to various fuel pumps such as a roller vane type and a trochoid type fuel pump. it can.
【００２７】[0027]
【考案の効果】以上詳述した通り、本考案によれば、弁
体の弁軸先端側にばね受を設け、該ばね受と弁体支持部
材との間に配設され、基端側が該弁体支持部材に固定さ
れ、先端側が自由端となって該ばね受と微小寸法離間
し、または該ばね受と当接するばね部材を設ける構成と
したから、燃料配管側に異常背圧が生じた場合でも、残
圧保持弁の弁体が吐出口内を閉弁時のシール性を得るの
に必要な寸法以上閉弁方向に変位するのを効果的に防止
でき、残圧保持弁にもぐり込み現象が生じるのを確実に
防止して、残圧保持弁に開，閉弁不良等の作動不良が生
じるのを効果的に防止でき、当該燃料ポンプの信頼性を
向上することができる。As described above in detail, according to the present invention, a spring support is provided at the distal end side of the valve shaft of the valve body, and is disposed between the spring support and the valve body support member. Since the distal end side is fixed to the valve body support member and the distal end side is a free end and is separated from the spring receiver by a small dimension, or a spring member is provided to be in contact with the spring receiver, abnormal back pressure occurs on the fuel pipe side. Even in this case, the valve body of the residual pressure holding valve can be effectively prevented from displacing in the valve closing direction more than the dimension required to obtain the sealing performance when closing the discharge port, and it will penetrate into the residual pressure holding valve. Can reliably be prevented from occurring, and an operation failure such as a failure to open or close the residual pressure holding valve can be effectively prevented, and the reliability of the fuel pump can be improved.
【図１】本考案の実施例による残圧保持弁を拡大して示
す縦断面図である。FIG. 1 is an enlarged longitudinal sectional view of a residual pressure holding valve according to an embodiment of the present invention.
【図２】従来技術による燃料ポンプの保管状態を示す正
面図である。FIG. 2 is a front view showing a storage state of a fuel pump according to the related art.
【図３】燃料ポンプを拡大して示す一部破断の正面図で
ある。FIG. 3 is a partially cutaway front view showing the fuel pump in an enlarged manner.
【図４】図３中の残圧保持弁を拡大して示す要部縦断面
図である。FIG. 4 is an enlarged longitudinal sectional view of a main part of the residual pressure holding valve in FIG. 3;
【図５】残圧保持弁が吐出口にもぐり込んだ状態を示す
図４と同様の要部縦断面図である。FIG. 5 is a longitudinal sectional view similar to FIG. 4, showing a state in which the residual pressure holding valve has been inserted into the discharge port.
１ 燃料ポンプ ２Ｃ 吐出口 ２１ 残圧保持弁 ２２ 弁室 ２３ 弁座 ２４ 弁体 ２４Ａ 弁部 ２４Ｂ 弁軸 ２５ 弁ガイド（弁体支持部材） ２６ ばね受 ２７ コイルスプリング（ばね部材） DESCRIPTION OF SYMBOLS 1 Fuel pump 2C Discharge port 21 Residual pressure holding valve 22 Valve room 23 Valve seat 24 Valve body 24A Valve part 24B Valve shaft 25 Valve guide (Valve support member) 26 Spring support 27 Coil spring (Spring member)
Claims (1)
と、該弁室の底部に設けられた弁座と、前記弁室内に設
けられ、該弁座に離着座する弁部と該弁部から弁室内を
軸方向に伸長する弁軸とからなる弁体と、前記弁室内に
設けられ、該弁体の弁軸を軸方向に摺動可能に支持する
弁体支持部材とからなる燃料ポンプの残圧保持弁におい
て、前記弁体の弁軸先端側にはばね受を設け、該ばね受
と前記弁体支持部材との間に配設され、基端側が該弁体
支持部材に固定され、先端側が自由端となって該ばね受
と微小寸法離間し、または該ばね受と当接するばね部材
を設けたことを特徴とする燃料ポンプの残圧保持弁。1. A valve chamber formed in a discharge port of a fuel pump, a valve seat provided in a bottom portion of the valve chamber, a valve portion provided in the valve chamber and detachably seated on the valve seat, and the valve. And a valve body provided in the valve chamber and supporting the valve shaft of the valve body slidably in the axial direction. In the residual pressure holding valve of the pump, a spring support is provided on a valve shaft distal end side of the valve body, and is disposed between the spring support and the valve body support member, and a base end side is fixed to the valve body support member. A residual pressure holding valve for a fuel pump, further comprising a spring member having a free end on a leading end side thereof and being separated from the spring receiver by a small dimension or contacting the spring receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1427691U JP2534947Y2 (en) | 1991-02-20 | 1991-02-20 | Fuel pump residual pressure holding valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1427691U JP2534947Y2 (en) | 1991-02-20 | 1991-02-20 | Fuel pump residual pressure holding valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04105990U JPH04105990U (en) | 1992-09-11 |
| JP2534947Y2 true JP2534947Y2 (en) | 1997-05-07 |
Family
ID=31901864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1427691U Expired - Lifetime JP2534947Y2 (en) | 1991-02-20 | 1991-02-20 | Fuel pump residual pressure holding valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2534947Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19618452B4 (en) * | 1996-05-08 | 2005-05-12 | Robert Bosch Gmbh | Aggregate for conveying fuel from a storage tank to an internal combustion engine |
| JP2009144542A (en) * | 2007-12-12 | 2009-07-02 | Aisan Ind Co Ltd | Fuel feeding device |
-
1991
- 1991-02-20 JP JP1427691U patent/JP2534947Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04105990U (en) | 1992-09-11 |
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