JP2008101617A - Fuel pump - Google Patents

Fuel pump Download PDF

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Publication number
JP2008101617A
JP2008101617A JP2007267457A JP2007267457A JP2008101617A JP 2008101617 A JP2008101617 A JP 2008101617A JP 2007267457 A JP2007267457 A JP 2007267457A JP 2007267457 A JP2007267457 A JP 2007267457A JP 2008101617 A JP2008101617 A JP 2008101617A
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Japan
Prior art keywords
plunger
fuel pump
cavity
coolant
inlet
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Granted
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JP2007267457A
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Japanese (ja)
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JP5015716B2 (en
Inventor
Gerhard Domberger
ドンベルガー ゲルハルト
Thomas Hamann
ハマン トーマス
Dietmar Pinkernell
ピンケルネル ディートマール
Holger Schaar
シャール ホルガー
Wolfgang Wagner
ヴァーグナー ヴォルフガング
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MAN Energy Solutions France SAS
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MAN Diesel SA
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Publication of JP2008101617A publication Critical patent/JP2008101617A/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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0408—Pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/08—Cooling; Heating; Preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • 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
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • 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
    • F02M2200/06—Fuel-injection apparatus having means for preventing coking, e.g. of fuel injector discharge orifices or valve needles
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams

Abstract

<P>PROBLEM TO BE SOLVED: To prevent fuel attachment from being formed in a guide area between a plunger and a pump cylinder in a fuel pump provided with the plunger movable supported in the pump cylinder, especially a high pressure fuel pump of a common rail type fuel injection device. <P>SOLUTION: A cavity 14 is provided in a plunger 12, and the plunger 12 is cooled from an inside thereof via the cavity 14. As a result, fuel attachment is not formed in the guide area between the plunger and the pump cylinder, and the guide area between the plunger and the pump cylinder is maintained to prevent fixation of the plunger. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、請求項１の前文に記載の燃料ポンプ、特にコモンレール式燃料噴射装置の高圧燃料ポンプに関する。   The present invention relates to a fuel pump according to the preamble of claim 1, and more particularly to a high-pressure fuel pump of a common rail fuel injection device.

実際に公知の燃料ポンプではポンプシリンダが利用され、該ポンプシリンダに、プランジャが移動可能に支持されている。プランジャは１個或いは複数のカムを介してポンプシリンダ内を昇降運動し、これにより、燃料が吸い込まれ、燃料ポンプによって負荷、例えば燃料供給系の噴射弁に導かれる。   In fact, a known fuel pump uses a pump cylinder, and a plunger is movably supported by the pump cylinder. The plunger moves up and down in the pump cylinder via one or a plurality of cams, whereby the fuel is sucked and guided by the fuel pump to a load, for example, an injection valve of the fuel supply system.

実際に公知の燃料ポンプでは、ポンプシリンダとプランジャとの間で生ずる漏れ燃料を燃料供給系或いは漏れ燃料帰還路に排出すべく、プランジャを移動可能に支持するポンプシリンダの箇所に、１個或いは複数の溝を設けている。特に燃料ポンプが重油燃料供給系に利用されるとき、プランジャとポンプシリンダの間の案内領域にスケールとも呼ばれる燃料付着物が生じ、該付着物は、プランジャとポンプシリンダとの間の案内隙間を狭め、プランジャを固着させてしまう。この危険は、運転温度が高ければ高い程そしてプランジャからの放熱が悪ければ悪い程、大きくなる。運転中に生ずる温度は、燃料の種類、品質並びに燃料ポンプが受ける負荷に左右される。   In fact, in known fuel pumps, one or a plurality of fuel pumps are provided at the position of the pump cylinder that movably supports the plunger so as to discharge the leaked fuel generated between the pump cylinder and the plunger to the fuel supply system or the leaked fuel return path. The groove is provided. Particularly when the fuel pump is used in a heavy oil fuel supply system, fuel deposits, also called scales, are generated in the guide region between the plunger and the pump cylinder, and the deposits narrow the guide gap between the plunger and the pump cylinder. The plunger is fixed. This risk increases with higher operating temperatures and worse heat dissipation from the plunger. The temperature generated during operation depends on the type and quality of the fuel and the load experienced by the fuel pump.

本発明の課題は、上述の問題に鑑み、新たな燃料ポンプを提供することにある。   The subject of this invention is providing the new fuel pump in view of the above-mentioned problem.

この課題は請求項１に記載の燃料ポンプによって解決される。本発明に基づいて、プランジャは空洞を有し、該空洞を介してプランジャが内側から冷却される。   This problem is solved by the fuel pump according to claim 1. In accordance with the invention, the plunger has a cavity through which the plunger is cooled from the inside.

本発明は、燃料ポンプのプランジャを内側から冷却することを提案し、もって運転中に生ずる熱をプランジャから排出する。従って、プランジャとポンプシリンダとの間における案内領域に付着物が生ずることが防ぎ、これにより、プランジャとポンプシリンダとの間の案内隙間を維持する。これにより、プランジャの固着を防止する。   The present invention proposes cooling the plunger of the fuel pump from the inside, so that heat generated during operation is discharged from the plunger. Therefore, it is possible to prevent deposits from being generated in the guide region between the plunger and the pump cylinder, thereby maintaining a guide gap between the plunger and the pump cylinder. This prevents the plunger from sticking.

本発明の第１の実施態様では、空洞を密閉中空室として形成し、部分的に冷却材を封入し、該冷却材を、プランジャの運動により空洞内を動かす。その際、プランジャの上部で熱を吸収し、該熱をプランジャの下部、詳しくはプランジャの運動の下死点で放出する。   In a first embodiment of the invention, the cavity is formed as a sealed hollow chamber, partially encapsulating the coolant, and moving the coolant in the cavity by the movement of the plunger. At that time, heat is absorbed at the upper part of the plunger, and the heat is released at the lower part of the plunger, specifically at the bottom dead center of the movement of the plunger.

本発明の第２の有利な実施態様では、空洞を、入口と出口とを備えた開放中空室として形成し、その場合には空洞を冷却材で連続的或いは周期的に貫流させる。   In a second advantageous embodiment of the invention, the cavity is formed as an open hollow chamber with an inlet and an outlet, in which case the cavity is allowed to flow continuously or periodically with coolant.

本発明の有利な実施態様を、従属請求項および以下の説明から明らかにする。以下図を参照して本発明の実施例を詳細に説明するが、本発明はこの実施例に限定されない。   Advantageous embodiments of the invention emerge from the dependent claims and the following description. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiments.

図１は、本発明に基づく燃料ポンプ１０の第１実施例を概略断面図で示し、燃料ポンプ１０は、ポンプシリンダ１１と該シリンダ１１内に移動可能に支持されたプランジャ１２を備える。プランジャ１２は、図１においてカム１３で制御されてポンプシリンダ１１内を昇降運動し、プランジャ１２の運動により、燃料を吸い込み、負荷に向けて搬送する。   FIG. 1 is a schematic cross-sectional view of a fuel pump 10 according to a first embodiment of the present invention. The fuel pump 10 includes a pump cylinder 11 and a plunger 12 that is movably supported in the cylinder 11. The plunger 12 is controlled by the cam 13 in FIG. 1 to move up and down in the pump cylinder 11, and the plunger 12 moves to suck in fuel and convey it toward the load.

図１において、プランジャ１２は空洞１４を備える。該空洞１４は、密閉中空室として形成され、部分的に冷却材１５を封入されている。冷却材１５は、液状冷却材又は所定温度以上でその集合状態が固相から液相に変化する冷却材、例えばナトリウムである。   In FIG. 1, the plunger 12 includes a cavity 14. The cavity 14 is formed as a sealed hollow chamber and partially encloses a coolant 15. The coolant 15 is a liquid coolant or a coolant whose aggregate state changes from a solid phase to a liquid phase at a predetermined temperature or higher, such as sodium.

燃料ポンプ１０の運転中、少なくとも運転温度の下で液状の冷却材１５が、空洞１４内で動き、即ち振り回され、該冷却材１５は、プランジャ１２の上部で熱を吸収し、プランジャ１２の下部、即ちプランジャ１２の運動の下死点で放出する。この結果、プランジャ１２と冷却材１５との間の十分な温度差、従って良好な熱伝達を常に保証できる。   During operation of the fuel pump 10, at least at the operating temperature, the liquid coolant 15 moves or is swung within the cavity 14, which absorbs heat at the top of the plunger 12 and lowers the plunger 12. That is, it is discharged at the bottom dead center of the movement of the plunger 12. As a result, a sufficient temperature difference between the plunger 12 and the coolant 15 and thus good heat transfer can always be guaranteed.

燃料ポンプ１０の運転中に生ずる熱は、プランジャ１２の上部から下向きに搬出され、プランジャ１２の下降時に下死点において大気に放出される。   Heat generated during operation of the fuel pump 10 is carried downward from the upper part of the plunger 12 and released to the atmosphere at the bottom dead center when the plunger 12 is lowered.

場合によっては、図１の燃料ポンプ１０のプランジャ１２は、その補助的冷却を実施するために、プランジャ１２の下部が外から油或いは燃料で濡らされる。   In some cases, the plunger 12 of the fuel pump 10 of FIG. 1 is wetted from the outside with oil or fuel to the bottom of the plunger 12 in order to perform its auxiliary cooling.

図２は、本発明による燃料ポンプ２０の第２実施例を示す。図２の燃料ポンプ２０も、ポンプシリンダ２１と該シリンダ２１内に移動可能に支持されたプランジャ２２とを備える。プランジャ２２はポンプシリンダ２１内を、カム２３で制御されて昇降運動する。   FIG. 2 shows a second embodiment of a fuel pump 20 according to the present invention. The fuel pump 20 of FIG. 2 also includes a pump cylinder 21 and a plunger 22 that is movably supported in the cylinder 21. The plunger 22 moves up and down in the pump cylinder 21 under the control of the cam 23.

燃料ポンプ２０のプランジャ２２は空洞２４を備える。図２の実施例で、空洞２４は冷却材の入口２５と出口２６を備えた開放中空室として形成され、該空洞２４を冷却材が貫流する。冷却材は、プランジャ行程に応じ、空洞２４を連続的又は周期的に貫流する。   The plunger 22 of the fuel pump 20 includes a cavity 24. In the embodiment of FIG. 2, the cavity 24 is formed as an open hollow chamber with a coolant inlet 25 and outlet 26 through which the coolant flows. The coolant flows through the cavity 24 continuously or periodically depending on the plunger stroke.

図２に示す実施例では、プランジャ２２の入口２５と出口２６は、ポンプシリンダ２１に各々設けた周溝２７と協働する。入口２５又は出口２６が各々の周溝２７と一致したとき、冷却材がプランジャ２０の空洞２４に供給されるか、そこから排出される。従って、図２において、空洞２４をプランジャ行程に依存して冷却材が周期的に貫流する。   In the embodiment shown in FIG. 2, the inlet 25 and the outlet 26 of the plunger 22 cooperate with circumferential grooves 27 provided in the pump cylinder 21. When the inlet 25 or outlet 26 coincides with each circumferential groove 27, coolant is supplied to or discharged from the cavity 24 of the plunger 20. Accordingly, in FIG. 2, the coolant periodically flows through the cavity 24 depending on the plunger stroke.

図２において、入口２５と協働する周溝２７に冷却材の入口管２８が開口し、これに対し出口２６と協働する周溝２７に冷却材の出口管２９が開口している。   In FIG. 2, a coolant inlet pipe 28 opens in a circumferential groove 27 cooperating with the inlet 25, whereas a coolant outlet pipe 29 opens in a circumferential groove 27 cooperating with the outlet 26.

図２の実施例では、冷却材の入口２５をプランジャ２２の上部、出口２６をプランジャ２２の下部に設けている。入口をプランジャの下部、出口をプランジャの下部に設けること、即ち、空洞２４の貫流方向を逆にしてもよい。図２では、冷却材として、特に燃料又は潤滑材を利用できる。   In the embodiment of FIG. 2, the coolant inlet 25 is provided at the top of the plunger 22 and the outlet 26 is provided at the bottom of the plunger 22. The inlet may be provided at the lower part of the plunger and the outlet may be provided at the lower part of the plunger, that is, the flow direction of the cavity 24 may be reversed. In FIG. 2, a fuel or a lubricant can be used as the coolant.

図３は、本発明による燃料ポンプ３０の第３実施例を示す。図３の燃料ポンプ３０も、ポンプシリンダ３１と該シリンダ３１内に移動可能に支持したプランジャ３２を備える。プランジャ３２は、ポンプシリンダ３１内をカム３３で制御されて昇降運動する。図３の実施例でも、プランジャ３２に冷却材用の空洞３４を設けている。該空洞３４は、図２の実施例と同じに開放中空室として形成し、入口３５を介して冷却材を供給し、出口３６を介して冷却材を排出する。入口３５は、ポンプシリンダ３１に設けられた周溝３７と協働し、該周溝３７に冷却材の入口管３８が開口している。従って、図３の実施例でも、空洞３４をプランジャ行程に依存して冷却材が周期的に貫流する。   FIG. 3 shows a third embodiment of a fuel pump 30 according to the present invention. The fuel pump 30 in FIG. 3 also includes a pump cylinder 31 and a plunger 32 that is movably supported in the cylinder 31. The plunger 32 moves up and down by being controlled by the cam 33 in the pump cylinder 31. In the embodiment of FIG. 3, the plunger 32 is provided with a coolant cavity 34. The cavity 34 is formed as an open hollow chamber in the same manner as in the embodiment of FIG. 2 and supplies coolant through the inlet 35 and discharges the coolant through the outlet 36. The inlet 35 cooperates with a circumferential groove 37 provided in the pump cylinder 31, and a coolant inlet pipe 38 is opened in the circumferential groove 37. Therefore, also in the embodiment of FIG. 3, the coolant periodically flows through the cavity 34 depending on the plunger stroke.

図２と３の実施例は、図２の実施例で冷却材の入口２５と出口２６を共通部品に設け、これに対し図３の実施例で入口と出口を２個の別個の部品に設けた点で相違している。   The embodiment of FIGS. 2 and 3 provides the coolant inlet 25 and outlet 26 in a common part in the embodiment of FIG. 2, whereas the embodiment of FIG. 3 provides the inlet and outlet in two separate parts. Is different.

それに応じ図３では、プランジャ３２を２分割構造としている。入口３５は上側プランジャ３９に、出口３６は下側プランジャ４０に各々設けている。図３では、下側プランジャ４０は、流路４２を規定するスリーブ状突起４３が上側プランジャ３９内に突出し、その際、入口３５は上側プランジャ３９の下部、出口３６は下側プランジャ４０の下部に設けている。この結果、下側プランジャ４０のスリーブ状突起４３と上側プランジャ３９との間を延びる空洞３４の部分４２を冷却材が貫流し、空洞に死空間が生じない。   Accordingly, in FIG. 3, the plunger 32 has a two-part structure. The inlet 35 is provided in the upper plunger 39, and the outlet 36 is provided in the lower plunger 40. In FIG. 3, the lower plunger 40 has a sleeve-like projection 43 that defines a flow path 42 protruding into the upper plunger 39, and the inlet 35 is below the upper plunger 39 and the outlet 36 is below the lower plunger 40. Provided. As a result, the coolant flows through the portion 42 of the cavity 34 extending between the sleeve-like projection 43 of the lower plunger 40 and the upper plunger 39, and no dead space is generated in the cavity.

図３の実施例でも、冷却材の入口と出口を置換できる。この場合は、入口を下側プランジャ４０に、出口を上側プランジャ３９に設け、空洞３４の貫流方向を逆にする。このため、ポンプシリンダ３１に追加的入口を設け、孔３６の位置を相応して適合させる。   In the embodiment of FIG. 3, the coolant inlet and outlet can also be replaced. In this case, the inlet is provided on the lower plunger 40 and the outlet is provided on the upper plunger 39 so that the flow direction of the cavity 34 is reversed. For this purpose, an additional inlet is provided in the pump cylinder 31 and the position of the hole 36 is adapted accordingly.

図３の実施例では、潤滑油を冷却材として利用する。潤滑油は入口３５を経て空洞３４に供給され、空洞３４内を上昇し、熱をプランジャ３２から吸収する。暖まった潤滑油は流路４１を経て出口３６に導き、プランジャ３２から排出する。潤滑油は駆動部潤滑用に利用する。   In the embodiment of FIG. 3, lubricating oil is used as a coolant. Lubricating oil is supplied to the cavity 34 via the inlet 35, rises in the cavity 34, and absorbs heat from the plunger 32. The warmed lubricating oil is guided to the outlet 36 through the flow path 41 and discharged from the plunger 32. Lubricating oil is used for driving part lubrication.

全ての実施例は、燃料ポンプのプランジャを内側から冷却する、詳しくはプランジャに設けた空洞を介して冷却する点で共通している。この結果、運転中に生ずる熱を、プランジャの領域から効果的に排出し、大気に放出できる。このため、プランジャとポンプシリンダとの間の案内領域に、該プランジャとポンプシリンダとの間の案内隙間を狭める付着物が生ずるのを防止できる。   All the embodiments are common in that the plunger of the fuel pump is cooled from the inside, specifically through a cavity provided in the plunger. As a result, heat generated during operation can be effectively discharged from the region of the plunger and released to the atmosphere. For this reason, it can prevent that the deposit | attachment which narrows the guide clearance gap between this plunger and a pump cylinder arises in the guide area | region between a plunger and a pump cylinder.

本発明に基づく燃料ポンプの第１実施例の概略断面図。1 is a schematic sectional view of a first embodiment of a fuel pump according to the present invention. 本発明に基づく燃料ポンプの第２実施例の概略断面図。FIG. 3 is a schematic sectional view of a second embodiment of the fuel pump according to the present invention. 本発明に基づく燃料ポンプの第３実施例の概略断面図。FIG. 4 is a schematic sectional view of a third embodiment of the fuel pump according to the present invention.

符号の説明Explanation of symbols

１０、２０、３０ 燃料ポンプ、１１、２１、３１ ポンプシリンダ、１２、２２、３２ プランジャ、１３、２３、３３ カム、１４、２４、３４ 空洞、１５ 冷却材、２０ 燃料ポンプ、２５、３５ 入口、２６、３６ 出口、２７ 周溝、２８、３８ 入口管、２９ 出口管、３７ 溝、３９ 上側プランジャ、４０ 下側プランジャ、４１ 流路、
４２ 空洞部分、４３ スリーブ状突起 10, 20, 30 Fuel pump, 11, 21, 31 Pump cylinder, 12, 22, 32 Plunger, 13, 23, 33 Cam, 14, 24, 34 Cavity, 15 Coolant, 20 Fuel pump, 25, 35 Inlet, 26, 36 outlet, 27 circumferential groove, 28, 38 inlet pipe, 29 outlet pipe, 37 groove, 39 upper plunger, 40 lower plunger, 41 flow path,
42 hollow part, 43 sleeve-like protrusion

Claims (10)

ポンプシリンダ内に移動可能に支持されたプランジャを備えた燃料ポンプにおいて、
前記プランジャ（１２、２２、３２）が空洞（１４、２４、３４）を有し、該空洞（１４、２４、３４）を介してプランジャ（１２、２２、３２）が内側から冷却されることを特徴とする燃料ポンプ。 In a fuel pump having a plunger movably supported in a pump cylinder,
The plunger (12, 22, 32) has a cavity (14, 24, 34), and the plunger (12, 22, 32) is cooled from the inside through the cavity (14, 24, 34). Features fuel pump. 空洞（１４）が密閉中空室として形成されて部分的に冷却材（１５）が封入され、該冷却材（１５）が、プランジャ（１２）の運動により空洞（１４）内で動かされることを特徴とする請求項１記載の燃料ポンプ。   The cavity (14) is formed as a sealed hollow chamber and is partially enclosed with a coolant (15), which is moved in the cavity (14) by the movement of the plunger (12). The fuel pump according to claim 1. 冷却材（１５）が、プランジャ（１２）の運動により空洞（１４）内で振り回され、プランジャ（１２）の上部において熱を吸収し、プランジャ（１２）の下部において熱を放出することを特徴とする請求項２記載の燃料ポンプ。   The coolant (15) is swung in the cavity (14) by the movement of the plunger (12) and absorbs heat at the top of the plunger (12) and releases heat at the bottom of the plunger (12). The fuel pump according to claim 2. 空洞（２４、３４）が、入口（２５、３５）と出口（２６、３６）とを備えた開放中空室として形成され、冷却材で貫流されることを特徴とする請求項１記載の燃料ポンプ。   2. Fuel pump according to claim 1, characterized in that the cavities (24, 34) are formed as open hollow chambers with inlets (25, 35) and outlets (26, 36) and are flowed through with coolant. . 冷却材が連続的或いは周期的に空洞（２４、３４）に供給され、又は空洞（２４、３４）から排出されることを特徴とする請求項４記載の燃料ポンプ。   5. The fuel pump according to claim 4, wherein the coolant is supplied to or discharged from the cavity (24, 34) continuously or periodically. プランジャ（２２）が、入口（２５）と出口（２６）が共通部品に設けられているように形成されたことを特徴とする請求項４又は５記載の燃料ポンプ。   6. A fuel pump according to claim 4 or 5, characterized in that the plunger (22) is formed such that the inlet (25) and the outlet (26) are provided in a common part. 入口（２５）がプランジャ（２２）の上部に、出口（２６）がプランジャ（２２）の下部に設けられたことを特徴とする請求項６記載の燃料ポンプ。   7. The fuel pump according to claim 6, wherein the inlet (25) is provided at the upper part of the plunger (22) and the outlet (26) is provided at the lower part of the plunger (22). プランジャ（３２）が、入口（３５）と出口（３６）が２個の別個の部品（３９、４０）に設けられるように形成されたことを特徴とする請求項４又は５記載の燃料ポンプ。   6. A fuel pump according to claim 4 or 5, characterized in that the plunger (32) is formed such that an inlet (35) and an outlet (36) are provided in two separate parts (39, 40). 入口（３５）がプランジャの第１部品（３９）の下部に、出口（３６）がプランジャの第２部品（４０）の下部に設けられたことを特徴とする請求項８記載の燃料ポンプ。   9. A fuel pump according to claim 8, wherein the inlet (35) is provided at the lower part of the first part (39) of the plunger and the outlet (36) is provided at the lower part of the second part (40) of the plunger. 冷却材を空洞（２４、３４）に供給し、又は空洞（２４、３４）から排出すべく、入口（２５、３５）および／又は出口（２６、３６）が、ポンプシリンダ（２１、３１）に設けられた周溝（２７、３７）と協働することを特徴とする請求項４から９の１つに記載の燃料ポンプ。   An inlet (25, 35) and / or outlet (26, 36) is provided to the pump cylinder (21, 31) for supplying coolant to the cavity (24, 34) or discharging it from the cavity (24, 34). 10. The fuel pump according to claim 4, wherein the fuel pump cooperates with a circumferential groove provided.
JP2007267457A 2006-10-21 2007-10-15 Fuel pump Expired - Fee Related JP5015716B2 (en)

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DE102014014475A1 (en) 2014-09-27 2016-03-31 Man Diesel & Turbo Se Fuel pump
DE102014016396A1 (en) 2014-11-05 2016-05-12 Man Diesel & Turbo Se Fuel pump
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JP2003049743A (en) * 2001-07-13 2003-02-21 Robert Bosch Gmbh Fuel pump for fuel system of internal combustion engine

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