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WO2008062589A1 - High-pressure fuel feed pump - Google Patents

High-pressure fuel feed pump Download PDF

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Publication number
WO2008062589A1
WO2008062589A1 PCT/JP2007/066078 JP2007066078W WO2008062589A1 WO 2008062589 A1 WO2008062589 A1 WO 2008062589A1 JP 2007066078 W JP2007066078 W JP 2007066078W WO 2008062589 A1 WO2008062589 A1 WO 2008062589A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
pressure
leak
pump
separate
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.)
Ceased
Application number
PCT/JP2007/066078
Other languages
French (fr)
Japanese (ja)
Inventor
Osamu Takahashi
Shingo Nakata
Takeshi Terada
Takao Miyawaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Corp
Original Assignee
Bosch Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bosch Corp filed Critical Bosch Corp
Priority to EP07792693A priority Critical patent/EP2088309A4/en
Publication of WO2008062589A1 publication Critical patent/WO2008062589A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • F02M59/04—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • 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
    • 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
    • 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
    • F02M59/442—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 means preventing fuel leakage around pump plunger, e.g. fluid barriers

Definitions

  • the present invention relates to a high-pressure fuel supply pump.
  • a high-pressure fuel supply pump that has been used conventionally for the purpose of supplying high-pressure fuel to a common rail system, for example, is accommodated in a barrel 10 1 in a reciprocating manner as shown in FIG.
  • the plunger 10 0 2 reciprocates in response to the rotation of the camshaft 10 3 and pressurizes the fuel supplied into the barrel 1 0 1 via the inlet / outlet valve 1 0 4, which is obtained High-pressure fuel is sent to the outside by an inlet / outlet ⁇ valve 10 4.
  • Japanese Laid-Open Patent Publication No. 8-683370 discloses a configuration of a high pressure fuel supply pump having two return passages, one of which is connected to a fuel tank. Disclosure of the invention
  • the leak fuel that is part of the fuel used for fuel lubrication of the barrel 10 1 among the high-pressure fuel pressurized in the barrel 1 0 1 Is supplied to the barrel 1 0 1 through the passage 1 0 5 again, especially in an operating state in which the amount of discharged fuel is reduced, the The temperature of the rel 1 0 1 and the plunger 1 0 2 increased, which was a major factor in reducing the fuel injection efficiency.
  • the configuration disclosed in Japanese Patent Laid-Open No. 8-6 8 3 70 in the case of a configuration having a plurality of high-pressure pump units, the configuration of the return passage for the treatment of leaked fuel Has the problem of increasing cost and cost.
  • An object of the present invention is to provide a high-pressure fuel supply pump that can solve the above-mentioned problems in the prior art.
  • a plurality of high-pressure pump units configured to pressurize fuel sucked into a barrel by a plunger to obtain high-pressure fuel
  • fuel lubrication is performed between the plunger and the barrel by at least a part of the high-pressure fuel, and each of the high-pressure pump units is configured to perform the fuel lubrication.
  • a leak fuel take-out section for taking out leaked fuel from the inside of the barrel to the outside is provided, and the leak fuel taken out by each leak fuel take-out section goes to the fuel low pressure side through the separate leak passage.
  • a high-pressure fuel supply pump is proposed which is characterized by being guided. According to the present invention, leak fuel that is a part of the fuel used for fuel lubrication between the plunger and the barrel is not circulated and supplied to the barrel, and the temperature rise of the plunger is suppressed, and simple With the configuration, the fuel injection efficiency can be improved.
  • FIG. 1 is a schematic external view of an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the first high-pressure pump section of FIG.
  • FIG. 3 is a view for explaining a leaked fuel take-out section shown by a cross section along line AA in FIG.
  • FIG. 4 is a diagram for explaining a modification of the embodiment of the present invention.
  • FIG. 5 is a diagram for explaining a modification of the embodiment of the present invention.
  • FIG. 6 is a view for explaining a conventional high-pressure fuel supply pump. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a view schematically showing the appearance of an embodiment of a high-pressure fuel supply pump to which the present invention is applied.
  • the high-pressure fuel supply pump 1 is used as a supply pump for a common rail system (not shown) used as a fuel injection device for a diesel engine.
  • FIG. 2 is a pump cross-sectional view for explaining the first high-pressure pump unit 1 A.
  • the first high pressure pump unit 1A will be described in detail with reference to FIG. 2.
  • the configurations of the second high pressure pump unit 1B to the fourth high pressure pump unit 1D are also the configurations of the first high pressure pump unit 1A.
  • Reference numeral 3 denotes a pump housing.
  • the common base end 3 Y of the pump housing 3 is formed in a substantially cylindrical shape having an axis in a direction perpendicular to the paper surface, and a cam shaft is provided in the common base end 3 Y. 4 are arranged coaxially.
  • the first cylindrical portion 3A is formed in a body at the common base end portion 3Y of the pump housing 3, and the main structural portion of the first high-pressure pump portion 1A is in the first cylindrical portion 3A. It has been incorporated.
  • the common base end 3 Y includes the second to the second high pressure pump portions 1 B, 1 C, 1 C, and 4 D for the second high pressure pump portion 1 D.
  • 1 1 is a barrel arranged coaxially in the first cylindrical part 3 A
  • 1 2 is a plunger chamber 1 1
  • a plunger chamber 1 1 is a plunger provided in a reciprocating motion along its axis in 1 A Yes
  • the plunger 1 2 is guided by the inner wall surface 3 A a of the valenore 1 1 so as to be movable in the axial direction of the first cylindrical portion 3 A.
  • the base end portion 1 2 A of the plunger 1 2 is pressed against the movement guide member 13 by the elastic spring 14 through the spring 1 14 a.
  • the moving guide member 13 is provided with a rotating roller 13 B that is rotatably fitted by a support bar 13 A.
  • the movement guide member 1 3 is elastically urged toward the camshaft 4 by the elastic spring 14 interposed between the barrel 1 1 and the movement guide member 1 3.
  • the rotating roller 13 B provided as described above is always in pressure contact with the cam shaft 4.
  • the fuel in the external fuel tank (not shown) is moved into the plunger chamber 1 1 through the fuel intake passages 1 7, 15 C and 15 B when the plunger 1 2 moves backward toward the camshaft 4 side. Inhaled in A. This sucked fuel is pressurized when the plunger 12 is lifted, and high-pressure fuel is obtained.
  • Reference numeral 15 denotes an inlet ⁇ 'outlet ⁇ valve assembly fixed to the tip of the barrel 11 in order to take out high-pressure fuel from the plunger chamber 11A.
  • Inlet 'Outlet ⁇ Valve assembly 1 5 Case 1 5 A has a passage 15 B and a passage 15 C provided in the plunger chamber 1 1 A. The high-pressure fuel obtained by the above is discharged from the valve body 15 D through the passage 15 B to the outside.
  • a leak fuel take-out section 16 is provided.
  • the leak fuel take-out part 16 is provided with an annular pot for collecting the leak fuel in the barrel provided at the end of the fuel leak hole 16 A and the plunger 1 2 side of the fuel leak hole 16 A. It is composed of 1 6 B and an annular leak separate oil feeding chamber 16 C formed by an annular groove formed in the outer peripheral wall of the barrel 11 1 at the other end of the fuel leak hole 16 A .
  • FIG. 3 is a cross-sectional view taken along line AA in FIG.
  • the leak fuel extraction sections 2 6, 3 6 similar to the leak fuel extraction section 1 6, respectively. 4 and 6 are provided. That is, the leak fuel takeout part 26 is composed of a fuel leak hole 26 A, an annular port 26 B, and a separate oil feeding chamber 26 C.
  • the leak fuel take-out part 36 is composed of a fuel leak hole 36 A, an annular port 36 B, and a separate oil feeding chamber 36 C.
  • the leak fuel take-out section 46 is composed of a fuel leak hole 46 A, an annular port 46 B, and an oil supply chamber 46 C for each leak.
  • the leak-separated oil supply chambers 16 C, 26 C, 36 C, and 46 C are connected to each other as shown in the figure by a connecting transport path 50.
  • the connected transportation path 50 is a separate leakage path for collecting the leaked fuel taken out by the leaked fuel take-out portions 16, 26, 36, and 46 and leading it to the fuel low pressure side. Therefore, the leak fuel extraction part of each high-pressure pump part 1 6, Each leaked fuel taken out by 2, 6, 3 and 4 6 is sent from the corresponding oil supply chambers for leaks 1 6 C, 2 6 C, 3 6 C and 4 6 C to the connected transport route 50, where the fuel pressure is low To the fuel tank, for example.
  • the leak fuel generated by the high-pressure fuel for lubrication between the barrel and the plunger is the leak fuel take-out section 1 6 provided in each high-pressure pump section. 2, 3 6, 4 6, and sent to a fuel low pressure section such as a fuel tank.
  • a fuel low pressure section such as a fuel tank.
  • FIG. 3 the leak fuel from each high-pressure pump section is sent to the fuel tank from the four leak-separated oil supply chambers 16 C, 26 C, 36 C, 46 C through the connected transport path 50. It is shown.
  • Figure 4 is a schematic depiction of this. However, how to escape leaked fuel is not limited to this configuration.
  • FIG. 5 shows another example of how to escape leaked fuel.
  • the leaked fuel is connected to the leak-separated oil supply chambers 16C, 26C, 36C, 46C, and connected to other return passages in the high-pressure pump.
  • a dedicated escape passage 70 is provided to allow escape.
  • the configuration shown in Fig. 5 provides the advantage of not requiring new piping outside the high-pressure pump.
  • the connected transport path 50 passes through the centers of the oil chambers by leak 16C, 26C, 36C and 46C. Is an example and does not necessarily have to pass through the center. Industrial applicability
  • the high-pressure fuel supply pump prevents the leaked fuel used for fuel lubrication between the plunger barrels from being circulated and supplied to the nozzle, thereby suppressing the temperature rise of the plunger. As a result, fuel injection efficiency can be improved, which helps improve the high-pressure fuel supply pump.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

In a high-pressure fuel feed pump (1), high-pressure pump sections (1A to 1D) are adapted to output high-pressure fuel obtained by pressurizing fuel sucked into barrels (11). In each of the high-pressure pump sections (1A to 1D), fuel lubrication is performed between the plunger (12) and the barrel (11) by at least a portion of the high-pressure fuel. The high-pressure fuel sections (1A to 1D) respectively have leaked-fuel takeout sections (16, 26, 36, 46) for taking out leaked fuel, which is produced by the high-pressure fuel for the fuel lubrication, from the inside of the barrels (11) to the outside. The fuel feed pump has a connection oil path (50) for collecting the leaked fuel that is taken out by the leaked-fuel takeout sections (16, 26, 36, 46) and guiding the leaked fuel to the low fuel pressure side. The leaked fuel is released to a fuel tank through the connection oil path (50).

Description

明細書 高圧燃料供給ポンプ 技術分野  High pressure fuel supply pump Technical field

本発明は、 高圧燃料供給ポンプに関するものである。 背景技術  The present invention relates to a high-pressure fuel supply pump. Background art

例えばコモンレールシステムに高圧燃料を供給する等の目的で従来から用いられて きている高圧燃料供給ポンプは、 第 6図に示されるように、 バレル 1 0 1内に往復動 可能に収容されているプランジャ 1 0 2がカムシャフト 1 0 3の回転に応じて往復動 し、 インレッ ト ·アウトレツ トバルブ 1 0 4を介してバレル 1 0 1内に供給される燃 料を加圧し、 これにより得られた高圧燃料がインレツ ト ·アウトレツ 卜バルブ 1 0 4 により外部に送り出される構成となっている。 また、 特開平 8— 6 8 3 7 0号公報に は、 リターン通路を 2本有しており、 そのうちの 1本が燃料タンクに接続されている 高圧燃料供給ポンプの構成が開示されている。 発明の開示  For example, a high-pressure fuel supply pump that has been used conventionally for the purpose of supplying high-pressure fuel to a common rail system, for example, is accommodated in a barrel 10 1 in a reciprocating manner as shown in FIG. The plunger 10 0 2 reciprocates in response to the rotation of the camshaft 10 3 and pressurizes the fuel supplied into the barrel 1 0 1 via the inlet / outlet valve 1 0 4, which is obtained High-pressure fuel is sent to the outside by an inlet / outlet レ valve 10 4. Japanese Laid-Open Patent Publication No. 8-683370 discloses a configuration of a high pressure fuel supply pump having two return passages, one of which is connected to a fuel tank. Disclosure of the invention

第 6図に示す従来の高圧燃料ポンプにあっては、 バレル 1 0 1内で加圧された高圧 燃料のうちバレル 1 0 1の燃料潤滑のために使用された燃料の一部であるリーク燃料 が通路 1 0 5を通って再びバレル 1 0 1に供給される構成となっているため、 特に、 吐出燃料量が少なくなるような運転状態にあっては、 当該燃料の上記循環のためにバ レル 1 0 1及びプランジャ 1 0 2の温度が上昇し、 燃料噴射効率を低下させる大きな 要因となっていた。 一方、 特開平 8— 6 8 3 7 0号公報に開示されている構成では、 複数の高圧ポンプ部を有している構成の場合には、 リーク燃料の処理のためのリタ一 ン通路の構成が複雑になり、 コス卜を上昇させるという問題点を有している。  In the conventional high-pressure fuel pump shown in FIG. 6, the leak fuel that is part of the fuel used for fuel lubrication of the barrel 10 1 among the high-pressure fuel pressurized in the barrel 1 0 1 Is supplied to the barrel 1 0 1 through the passage 1 0 5 again, especially in an operating state in which the amount of discharged fuel is reduced, the The temperature of the rel 1 0 1 and the plunger 1 0 2 increased, which was a major factor in reducing the fuel injection efficiency. On the other hand, in the configuration disclosed in Japanese Patent Laid-Open No. 8-6 8 3 70, in the case of a configuration having a plurality of high-pressure pump units, the configuration of the return passage for the treatment of leaked fuel Has the problem of increasing cost and cost.

本発明の目的は、 従来技術における上記の問題点を解決することができる高圧燃料 供給ポンプを提供することにある。 上記課題を解決するため、 本発明によれば、 バレル内に吸入された燃料をプランジ ャによって加圧して高圧燃料を ¾出するように構成された複数の高圧ポンプ部を有し ており、 前記複数の高圧ポンプ部のそれぞれにおいて前記高圧燃料の少なくとも一部 によってプランジャとバレルの間での燃料潤滑が行われるようになっている高圧燃料 供給ポンプにおいて、 前記高圧ポンプ部のそれぞれが前記燃料潤滑のために生じたリ —ク燃料を前記バレル内から外部に取り出すためのリーク燃料取出部を有しており、 各リーク燃料取出部によって取り出されたリーク燃料がリーク別送路によつて燃料低 圧側へ導かれるようになつていることを特徴とする高圧燃料供給ポンプが提案される。 本発明によれば、 プランジャとバレルとの間の燃料潤滑のために使用された燃料の 一部であるリーク燃料がバレルに循環供給されることがなく、 プランジャの温度上昇 が抑えられ、 簡単な構成で燃料噴射効率の向上を図ることができる。 図面の簡単な説明 An object of the present invention is to provide a high-pressure fuel supply pump that can solve the above-mentioned problems in the prior art. In order to solve the above-described problem, according to the present invention, there is provided a plurality of high-pressure pump units configured to pressurize fuel sucked into a barrel by a plunger to obtain high-pressure fuel, In each of the plurality of high-pressure pump units, fuel lubrication is performed between the plunger and the barrel by at least a part of the high-pressure fuel, and each of the high-pressure pump units is configured to perform the fuel lubrication. A leak fuel take-out section for taking out leaked fuel from the inside of the barrel to the outside is provided, and the leak fuel taken out by each leak fuel take-out section goes to the fuel low pressure side through the separate leak passage. A high-pressure fuel supply pump is proposed which is characterized by being guided. According to the present invention, leak fuel that is a part of the fuel used for fuel lubrication between the plunger and the barrel is not circulated and supplied to the barrel, and the temperature rise of the plunger is suppressed, and simple With the configuration, the fuel injection efficiency can be improved. Brief Description of Drawings

第 1図は本発明の一実施形態の概略外観図である。  FIG. 1 is a schematic external view of an embodiment of the present invention.

第 2図は第 1図の第 1高圧ポンプ部の断面図である。  FIG. 2 is a cross-sectional view of the first high-pressure pump section of FIG.

第 3図は第 1図の A— A線で断面して示すリーク燃料取出部を説明するための図で ある。  FIG. 3 is a view for explaining a leaked fuel take-out section shown by a cross section along line AA in FIG.

第 4図は本発明の実施の形態の変形例を説明するための図である。  FIG. 4 is a diagram for explaining a modification of the embodiment of the present invention.

第 5図は本発明の実施の形態の変形例を説明するための図である。  FIG. 5 is a diagram for explaining a modification of the embodiment of the present invention.

第 6図は従来の高圧燃料供給ボンプを説明するための図である。 発明を実施するための最良の形態  FIG. 6 is a view for explaining a conventional high-pressure fuel supply pump. BEST MODE FOR CARRYING OUT THE INVENTION

本発明をより詳細に説述するために、 添付の図面に従つてこれを説明する。  In order to describe the present invention in more detail, it will be described with reference to the accompanying drawings.

第 1図は、 本発明を適用した高圧燃料供給ポンプの一実施例の外観を概略的に示す 図である。 本実施例にあっては、 高圧燃料供給ポンプ 1は、 ディーゼル機関用燃料噴 射装置として用いられるコモンレールシステム （図示せず） のサプライポンプとして 使用されるもので、 本体 2には、 図示しないディーゼル機関からの回転駆動力により 駆動されるカムシャフ ト （第 2図参照） により所定の位相差をもって駆動される第 1 高庄ポンプ部 1 A〜第 4高圧ポンプ部 1 Dまでの 4つの高庄ポンプ部が設けられてい る。 FIG. 1 is a view schematically showing the appearance of an embodiment of a high-pressure fuel supply pump to which the present invention is applied. In this embodiment, the high-pressure fuel supply pump 1 is used as a supply pump for a common rail system (not shown) used as a fuel injection device for a diesel engine. The first driven with a predetermined phase difference by the camshaft (see Fig. 2) driven by the rotational driving force from the engine. There are four Takasho pump sections from Takasho pump section 1A to 4th high pressure pump section 1D.

第 2図は、 第 1高圧ポンプ部 1 Aを説明するためのポンプ断面図である。 以下、 第 2図を参照して第 1高圧ポンプ部 1 Aについて詳しく説明するが、 第 2高圧ボンプ部 1 B〜第 4高圧ポンプ部 1 Dの構成も、 第 1高圧ポンプ部 1 Aの構成と同榇である。 符号 3で示されるのはポンプハウジングであり、 ポンプハウジング 3の共通基端部 3 Yは紙面と垂直な方向に軸線を有する略円筒状に形成され、 共通基端部 3 Y内には カムシャフ ト 4が同軸に配置されている。 そして、 ポンプハウジング 3の共通基端部 3 Yには第 1円筒部 3 Aがー体に形成されており、 第 1円筒部 3 A内に第 1高圧ボン プ部 1 Aの主要構造部が組み込まれている。  FIG. 2 is a pump cross-sectional view for explaining the first high-pressure pump unit 1 A. Hereinafter, the first high pressure pump unit 1A will be described in detail with reference to FIG. 2. However, the configurations of the second high pressure pump unit 1B to the fourth high pressure pump unit 1D are also the configurations of the first high pressure pump unit 1A. And the same. Reference numeral 3 denotes a pump housing. The common base end 3 Y of the pump housing 3 is formed in a substantially cylindrical shape having an axis in a direction perpendicular to the paper surface, and a cam shaft is provided in the common base end 3 Y. 4 are arranged coaxially. The first cylindrical portion 3A is formed in a body at the common base end portion 3Y of the pump housing 3, and the main structural portion of the first high-pressure pump portion 1A is in the first cylindrical portion 3A. It has been incorporated.

第 2図では示されていないが、 共通基端部 3 Yには、 第 2高圧ポンプ部 1 B、 第 3 高圧ポンプ部 1 C、 第 4高圧ポンプ部 1 Dのために、 第 2乃至第 4円筒部 3 B、 3 C、 3 0カ《、 第 1円筒部 3 Aと同様に一体に形成されており （第 1図参照） 、 第 1高圧ポ ンプ部 1 A乃至第 4高圧ポンプ部 1 Dは、 カムシャフ 卜 4によってそれぞれ位相差を 持って駆動される構成となっている。  Although not shown in FIG. 2, the common base end 3 Y includes the second to the second high pressure pump portions 1 B, 1 C, 1 C, and 4 D for the second high pressure pump portion 1 D. 4 Cylinders 3 B, 3 C, 30 «, integrally formed in the same way as the first cylinder 3 A (see Fig. 1), 1st high pressure pump 1A to 4th high pressure pump 1D is driven by camshaft 4 with a phase difference.

次に、 第 1高圧ポンプ部 1 Aの構成について説明する。 1 1は第 1円筒部 3 A内に 同軸に配設されたバレル、 1 2 はノ 'レノレ 1 1のプランジャ室 1 1 A内にその軸線に沿 つて往復動可能に設けられているプランジャであり、 プランジャ 1 2はバレノレ 1 1の 内壁面 3 A aに案内されて第 1円筒部 3 Aの軸線方向に運動可能なようになつている。 プランジャ 1 2の基端部 1 2 Aは、 スプリングシ一卜 1 4 aを介して弾発ばね 1 4に より移動案内部材 1 3に押し付けられている。 移動案内部材 1 3には、 支持棒 1 3 A によって回転自在に嵌め合わされている回転ローラ 1 3 Bが設けられている。 バレル 1 1 と移動案内部材 1 3との間に介装されている弾発ばね 1 4によって移動案内部材 1 3はカムシャフ ト 4に向けて弾発付勢されていて、 移動案内部材 1 3に上述の如く して設けられている回転ローラ 1 3 Bがカムシャフ ト 4に常時圧接されるようになつ ている。  Next, the configuration of the first high-pressure pump unit 1A will be described. 1 1 is a barrel arranged coaxially in the first cylindrical part 3 A, 1 2 is a plunger chamber 1 1, a plunger chamber 1 1 is a plunger provided in a reciprocating motion along its axis in 1 A Yes, the plunger 1 2 is guided by the inner wall surface 3 A a of the valenore 1 1 so as to be movable in the axial direction of the first cylindrical portion 3 A. The base end portion 1 2 A of the plunger 1 2 is pressed against the movement guide member 13 by the elastic spring 14 through the spring 1 14 a. The moving guide member 13 is provided with a rotating roller 13 B that is rotatably fitted by a support bar 13 A. The movement guide member 1 3 is elastically urged toward the camshaft 4 by the elastic spring 14 interposed between the barrel 1 1 and the movement guide member 1 3. The rotating roller 13 B provided as described above is always in pressure contact with the cam shaft 4.

この結果、 図示しないディ一ゼル機関の回転力によりカムシャフト 4が回転せしめ られると、 移動案内部材 1 3がカムシャフ卜 4の回転に同期して往復動し、 プランジ ャ 1 2をバレル 1 1内で往復動させることができる構成となっている。 As a result, when the camshaft 4 is rotated by the rotational force of the diesel engine (not shown), the moving guide member 13 reciprocates in synchronization with the rotation of the camshaft 卜 4, and the plunge The configuration is such that the cylinder 12 can be reciprocated within the barrel 11.

外部の燃料タンク （図示せず） 内の燃料は、 プランジャ 1 2がカムシャフ卜 4側に 向けて後退したときに、 燃料吸入路 1 7、 1 5 C、 1 5 Bを介してプランジャ室 1 1 A内に吸入される。 この吸入された燃料はプランジャ 1 2がリフ卜した時に加圧され、 高圧燃料が得られる。  The fuel in the external fuel tank (not shown) is moved into the plunger chamber 1 1 through the fuel intake passages 1 7, 15 C and 15 B when the plunger 1 2 moves backward toward the camshaft 4 side. Inhaled in A. This sucked fuel is pressurized when the plunger 12 is lifted, and high-pressure fuel is obtained.

符号 1 5で示されるのは、 プランジャ室 1 1 Aから高圧燃料を取り出すため、 バレ ル 1 1の先端部に固設されているインレツ 卜 'アウトレツ 卜バルブ組立体である。 ィ ンレッ ト 'アウ トレツ 卜バルブ組立体 1 5のケ一シング 1 5 A内には、 通路 1 5 Bと 通路 1 5 Cとが設けられており、 プランジャ室 1 1 A内での燃料加圧によって得られ た高圧燃料は、 通路 1 5 Bを通って弁本体 1 5 Dから外部に吐出される。  Reference numeral 15 denotes an inlet 卜 'outlet 卜 valve assembly fixed to the tip of the barrel 11 in order to take out high-pressure fuel from the plunger chamber 11A. Inlet 'Outlet 卜 Valve assembly 1 5 Case 1 5 A has a passage 15 B and a passage 15 C provided in the plunger chamber 1 1 A. The high-pressure fuel obtained by the above is discharged from the valve body 15 D through the passage 15 B to the outside.

一方、 ノ'レル 1 1には、 バレル 1 1とプランジャ 1 2との間を燃料潤滑状態とする ためにプランジャ室 1 1 A内に高圧燃料を供給することによって生じたリーク燃料を 外部に取り出すためのリーク燃料取出部 1 6が設けられている。 本実施例では、 リー ク燃料取出部 1 6は、 燃料リーク穴 1 6 Aと、 燃料リーク穴 1 6 Aのプランジャ 1 2 側の端部に設けられバレル内のリーク燃料を集めるための環状ポ一卜 1 6 Bと、 燃料 リーク穴 1 6 Aの他端部においてバレル 1 1の外周壁に形成された環状溝により形成 されている環状のリーク別送油室 1 6 Cとから構成されている。  On the other hand, the fuel leaked by supplying high pressure fuel into the plunger chamber 1 1 A to take out fuel between the barrel 1 1 and the plunger 1 2 is taken out to the nozzle 1 1. A leak fuel take-out section 16 is provided. In the present embodiment, the leak fuel take-out part 16 is provided with an annular pot for collecting the leak fuel in the barrel provided at the end of the fuel leak hole 16 A and the plunger 1 2 side of the fuel leak hole 16 A. It is composed of 1 6 B and an annular leak separate oil feeding chamber 16 C formed by an annular groove formed in the outer peripheral wall of the barrel 11 1 at the other end of the fuel leak hole 16 A .

第 3図は、 第 1図の A - A線断面図である。 第 3図に示されているように、 第 2高 圧ポンプ部 1 B〜第 4高圧ポンプ部 1 Dにおいても、 それぞれ、 リーク燃料取出部 1 6と同様のリーク燃料取出部 2 6、 3 6、 4 6が設けられている。 すなわち、 リーク 燃料取出部 2 6は、 燃料リーク穴 2 6 Aと環状ポ一卜 2 6 Bとリーク別送油室 2 6 C とから構成されている。 リーク燃料取出部 3 6は、 燃料リーク穴 3 6 Aと環状ポート 3 6 Bとリーク別送油室 3 6 Cとから構成されている。 リーク燃料取出部 4 6は、 燃 料リーク穴 4 6 Aと環状ポート 4 6 Bとリーク別送油室 4 6 Cとから構成されている。 そして、 リーク別送油室 1 6 C、 2 6 C、 3 6 C、 4 6 Cは連結輸送路 5 0によつ て図示の如く相互に連結されている。 連結輸送路 5 0は、 各リーク燃料取出部 1 6、 2 6、 3 6、 4 6によって取り出されたリーク燃料を集めて燃料低圧側へ導びくため のリーク別送路となっている。 したがって、 各高圧ポンプ部のリーク燃料取出部 1 6、 2 6、 3 6、 4 6によって取り出された各リーク燃料は、 対応するリーク別送油室 1 6 C、 2 6 C、 3 6 C、 4 6 Cから連結輸送路 5 0に送られ、 燃料低圧側、 例えば燃 料タンクに別送される。 FIG. 3 is a cross-sectional view taken along line AA in FIG. As shown in FIG. 3, in the second high pressure pump section 1 B to the fourth high pressure pump section 1 D, the leak fuel extraction sections 2 6, 3 6 similar to the leak fuel extraction section 1 6, respectively. 4 and 6 are provided. That is, the leak fuel takeout part 26 is composed of a fuel leak hole 26 A, an annular port 26 B, and a separate oil feeding chamber 26 C. The leak fuel take-out part 36 is composed of a fuel leak hole 36 A, an annular port 36 B, and a separate oil feeding chamber 36 C. The leak fuel take-out section 46 is composed of a fuel leak hole 46 A, an annular port 46 B, and an oil supply chamber 46 C for each leak. The leak-separated oil supply chambers 16 C, 26 C, 36 C, and 46 C are connected to each other as shown in the figure by a connecting transport path 50. The connected transportation path 50 is a separate leakage path for collecting the leaked fuel taken out by the leaked fuel take-out portions 16, 26, 36, and 46 and leading it to the fuel low pressure side. Therefore, the leak fuel extraction part of each high-pressure pump part 1 6, Each leaked fuel taken out by 2, 6, 3 and 4 6 is sent from the corresponding oil supply chambers for leaks 1 6 C, 2 6 C, 3 6 C and 4 6 C to the connected transport route 50, where the fuel pressure is low To the fuel tank, for example.

高圧燃料ポンプ 1は以上のように構成されているので、 バレルとプランジャとの間 の潤滑用の高圧燃料によって生じたリーク燃料は、 各高圧ポンプ部に設けられたリ一 ク燃料取出部 1 6、 2 6、 3 6、 4 6を介して燃料タンク等の燃料低圧部へ送られる。 この結果、 プランジャ 1 1に供給される燃料の温度が高圧燃料のリーグのために上昇 することがなく、 従来に比べて、 燃料噴射効率を著しく改善することができる。  Since the high-pressure fuel pump 1 is configured as described above, the leak fuel generated by the high-pressure fuel for lubrication between the barrel and the plunger is the leak fuel take-out section 1 6 provided in each high-pressure pump section. 2, 3 6, 4 6, and sent to a fuel low pressure section such as a fuel tank. As a result, the temperature of the fuel supplied to the plunger 11 does not rise due to the league of high-pressure fuel, and the fuel injection efficiency can be significantly improved as compared with the conventional case.

第 3図においては、 各高圧ポンプ部のリーク燃料が 4つのリーク別送油室 1 6 C、 2 6 C , 3 6 C、 4 6 Cから連結輸送路 5 0を介して燃料タンクへ送られる場合が示 されている。 第 4図はこれを模式的に描いたものである。 しかし、 リーク燃料の逃が し方はこの構成に限らない。  In Fig. 3, the leak fuel from each high-pressure pump section is sent to the fuel tank from the four leak-separated oil supply chambers 16 C, 26 C, 36 C, 46 C through the connected transport path 50. It is shown. Figure 4 is a schematic depiction of this. However, how to escape leaked fuel is not limited to this configuration.

第 5図はリーク燃料の逃がし方の他の例を示すものである。 第 5図に示す構成によ れば、 リーク燃料を、 リーク別送油室 1 6 C、 2 6 C , 3 6 C、 4 6 Cを連結すると ともに高圧ポンプ内の他のリターン通路に連結されている専用の逃がし通路 7 0を設 けることにより逃がすようになつている。 第 5図に示す構成によれば、 高圧ポンプ外 に新規配管を必要としない利点が得られる。 なお、 第 4図の構成においては、 連結輸 送路 5 0がリーク別送油室 1 6 C、 2 6 C、 3 6 C及び 4 6 Cの中心を通る場合が示 されているが、 この構成は一例であり、 必ずしも中心を通る必要はない。 産業上の利用可能性  FIG. 5 shows another example of how to escape leaked fuel. According to the configuration shown in FIG. 5, the leaked fuel is connected to the leak-separated oil supply chambers 16C, 26C, 36C, 46C, and connected to other return passages in the high-pressure pump. A dedicated escape passage 70 is provided to allow escape. The configuration shown in Fig. 5 provides the advantage of not requiring new piping outside the high-pressure pump. In the configuration of Fig. 4, it is shown that the connected transport path 50 passes through the centers of the oil chambers by leak 16C, 26C, 36C and 46C. Is an example and does not necessarily have to pass through the center. Industrial applicability

以上のように、 本発明による高圧燃料供給ポンプは、 プランジャーバレル間の燃料 潤滑のために使用されたリーク燃料がノ レルに循環供給されることがないので、 ブラ ンジャの温度上昇を抑え、 これにより、 燃料噴射効率の向上を図ることができ、 高圧 燃料供給ポンプの改善に役立つ。  As described above, the high-pressure fuel supply pump according to the present invention prevents the leaked fuel used for fuel lubrication between the plunger barrels from being circulated and supplied to the nozzle, thereby suppressing the temperature rise of the plunger. As a result, fuel injection efficiency can be improved, which helps improve the high-pressure fuel supply pump.

Claims

請求の範囲 The scope of the claims 1. バレル内に吸入された燃料をブランジャによつて加圧して高圧燃料を吐出するよ うに構成された複数の高圧ポンプ部を有しており、 前記複数の高圧ポンプ部のそれぞ れにおいて前記高圧燃料の少なくとも一部によってブランジャとバレルの藺での燃料 潤滑が行われるようになつている高圧燃料供給ポンプにおいて、 1. It has a plurality of high-pressure pump parts configured to pressurize fuel sucked into a barrel with a blanker and discharge high-pressure fuel, and each of the plurality of high-pressure pump parts In a high-pressure fuel supply pump in which fuel lubrication is performed between the flanger and the barrel by at least part of the high-pressure fuel. 前記高圧ポンプ部のそれぞれが前記燃料潤滑のために生じたリーク燃料を前記 レ ル内から外部に取り出すためのリーク燃料取出部を有しており、  Each of the high-pressure pump portions has a leak fuel extraction portion for taking out leak fuel generated due to the fuel lubrication from the inside of the reel, 各リ ク燃料取出部によって取り出されたリーク燃料がリーク別送路によつて燃料 低圧側へ導かれるようになつている  The leaked fuel taken out by each liquefied fuel take-out section is led to the fuel low-pressure side by the separate leak route. ことを特徴とする高圧燃料供給ポンプ。 A high-pressure fuel supply pump characterized by that. 2 . 前記リーク燃料取出部が、 燃料リーク穴と、 前記燃料リーク穴の前記プランジャ 側の端部に設けられ前記バレル内のリーク燃料を集めるための環状ポ一卜と、 前記燃 料リーク穴の他端部において前記 レルの外周壁に形成された環状溝により形成され ている環状のリーク別送油室とを備えて成る請求の範囲第 1項記載の高圧燃料供給ポ ンプ。 2. The leak fuel take-out portion is provided at a fuel leak hole, an end of the fuel leak hole on the plunger side for collecting leak fuel in the barrel, and the fuel leak hole. The high-pressure fuel supply pump according to claim 1, further comprising an annular separate oil feeding chamber formed by an annular groove formed in an outer peripheral wall of the reel at the other end. 3 . 前記リーク別送路が、 前記複数の高圧ポンプ部の各リ一ク別送油室を相互に連結 する連結油送路である請求の範囲第 2項記載の高圧燃料供給ポンプ。 3. The high-pressure fuel supply pump according to claim 2, wherein the separate-leakage supply path is a connected oil-feeding path that interconnects the separate separate-feeding oil chambers of the plurality of high-pressure pump units. 4 . 前記リーク別送路が、 高圧ポンプ内の他のリターン通路に連結されている専用の 逃がし通路であり、 該逃がし通路が前記複数の高圧ポンプの各リーク別送油室に連結 されている請求の範囲第 2項記載の高圧燃料供給ポンプ。 4. The separate leakage passage is a dedicated escape passage connected to another return passage in the high-pressure pump, and the escape passage is connected to each leak-separated oil supply chamber of the plurality of high-pressure pumps. The high-pressure fuel supply pump according to claim 2 in the range.
PCT/JP2007/066078 2006-11-24 2007-08-14 High-pressure fuel feed pump Ceased WO2008062589A1 (en)

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CN201851241U (en) * 2010-11-18 2011-06-01 博世汽车柴油系统股份有限公司 High-pressure fuel oil pump
CN201851248U (en) * 2010-11-18 2011-06-01 博世汽车柴油系统股份有限公司 High-pressure fuel pump
EP2530316A1 (en) * 2011-06-02 2012-12-05 Delphi Technologies Holding S.à.r.l. Fuel pump lubrication
EP2530315A1 (en) 2011-06-02 2012-12-05 Delphi Technologies Holding S.à.r.l. Fuel pump lubrication

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EP2088309A1 (en) 2009-08-12

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