JP2008157233A - Fuel pump - Google Patents

Fuel pump Download PDF

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Publication number
JP2008157233A
JP2008157233A JP2007326574A JP2007326574A JP2008157233A JP 2008157233 A JP2008157233 A JP 2008157233A JP 2007326574 A JP2007326574 A JP 2007326574A JP 2007326574 A JP2007326574 A JP 2007326574A JP 2008157233 A JP2008157233 A JP 2008157233A
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Prior art keywords
groove
fuel pump
pump
fuel
air
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JP2007326574A
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JP4733102B2 (en
Inventor
Torsten Gritzko
トルステン・グリツコー
Thomas Herman
トーマス・ハーマン
Ludwig Maier
ルートヴィヒ・マイアー
Dieter Neumann
ディーター・ノイマン
Holger Schaar
ホルガー・シャー
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MAN Energy Solutions SE
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MAN Diesel SE
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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
    • F02M59/44—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
    • 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
    • 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
    • F02M59/02—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
    • 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
    • F04B1/0421—Cylinders
    • 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
    • F04B53/04—Draining
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new fuel pump solving a problem that one or each groove to which barrier oil is supplied prevents fuel which can not be discharged through the groove from mixing into lubricating oil but that there is risk of mixture of barrier oil and fuel. <P>SOLUTION: The fuel pump is especially a high pressure fuel pump for a common rail fuel system, includes a pump piston 13 guided in a pump cylinder 11, has at least one leak groove 15, 16 formed in a region of a cutout part 12 of the pump cylinder 11 guiding the pump piston 13 therein, and can discharge fuel leaking from a part between the pump cylinder 11 and the pump piston 13. At least one groove 18 capable of supplying gaseous medium is formed in a region of the cutout part 12 of the pump cylinder 11 guiding the pump piston 13 therein. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、請求項１のプレアンブルに記載の、燃料ポンプ、特にコモンレール燃料システムの高圧燃料ポンプに関する。   The invention relates to a fuel pump, in particular a high-pressure fuel pump of a common rail fuel system, according to the preamble of claim 1.

燃料ポンプはポンプシリンダーを有している。このポンプシリンダー内にはポンプピストンが移動可能に支持または案内されている。ポンプピストンは、１つまたは複数のカムによってポンプシリンダー内で上下に移動し、それによって、燃料が吸引されて、燃料ポンプから消費装置、たとえば燃料システムの噴射弁に供給される。   The fuel pump has a pump cylinder. A pump piston is movably supported or guided in the pump cylinder. The pump piston is moved up and down in the pump cylinder by one or more cams, whereby fuel is aspirated and supplied from the fuel pump to a consuming device, for example an injection valve of the fuel system.

実際の使用から、燃料ポンプは、ポンプピストンが中で移動可能に支持または案内されているポンプシリンダーの領域において、１つまたは複数の漏洩溝を有しており、それにより、ポンプシリンダーとポンプピストンとの間に生じる燃料漏れを、燃料システム内に、または漏れ貫流部に排出する。特に、燃料ポンプが、重油またはガスオイルで操作される燃料システム内で使用される場合は、膜(Verlackungen)と呼ばれる燃料沈着が、ポンプピストンとポンプシリンダーとの間の案内領域に形成されるおそれがあり、ポンプピストンとポンプシリンダーとの間の案内遊びを狭めてしまい、その結果、ピストンの焼き付きが生じる可能性がある。   In actual use, the fuel pump has one or more leakage grooves in the region of the pump cylinder in which the pump piston is movably supported or guided, whereby the pump cylinder and the pump piston The fuel leak that occurs between the two is discharged into the fuel system or into the leak through part. Especially when the fuel pump is used in a fuel system operated with heavy oil or gas oil, fuel deposits called membranes may be formed in the guiding area between the pump piston and the pump cylinder This can narrow the guide play between the pump piston and the pump cylinder, which can result in piston seizure.

実際の使用から公知となっている燃料ポンプの場合、ポンプピストンが中で移動可能に支持または案内されているポンプシリンダーの切欠き部の領域において、少なくとも１つの溝が形成されており、この溝に対してバリアオイルが供給されることがさらに公知となっている。   In the case of fuel pumps known from actual use, at least one groove is formed in the region of the notch of the pump cylinder in which the pump piston is movably supported or guided. It is further known that barrier oil is supplied.

バリアオイルが供給される１つまたは各溝は、１つまたは各漏洩溝を介して排出され得ない燃料が潤滑油内に入り込むことを防止するものである。しかしながら、その際、バリアオイルと燃料が混合するおそれがあるという問題が生じる。このことは特に、燃料としてガスオイルが使用される場合に当てはまる。   The one or each groove to which the barrier oil is supplied prevents the fuel that cannot be discharged through the one or each leakage groove from entering the lubricating oil. However, in that case, there arises a problem that the barrier oil and the fuel may be mixed. This is especially true when gas oil is used as the fuel.

上記事項に鑑みて、本発明の課題は、新規の燃料ポンプを提供することである。この問題は、請求項１に係る燃料ポンプによって解決される。本発明によると、ポンプピストンが中で案内されているポンプシリンダーの切欠き部の領域において、気体状の媒体が供給可能な少なくとも１つの溝が形成されている。   In view of the above, an object of the present invention is to provide a novel fuel pump. This problem is solved by the fuel pump according to claim 1. According to the invention, in the region of the notch of the pump cylinder in which the pump piston is guided, at least one groove is formed which can supply a gaseous medium.

本発明によると、ポンプピストンが中で案内されているポンプシリンダーの切欠き部の領域において、気体状の媒体が供給可能な少なくとも１つの溝が形成されていることが提案される。したがって本発明によると、１つまたは各溝には、バリアオイルではなくバリアガスが供給される。このことには、バリアオイルおよび燃料の混合が起こり得ないという利点がある。   According to the invention, it is proposed that in the region of the notch of the pump cylinder in which the pump piston is guided, at least one groove is formed which can supply a gaseous medium. Thus, according to the present invention, one or each groove is supplied with barrier gas rather than barrier oil. This has the advantage that no mixing of barrier oil and fuel can occur.

本発明の好適な一構成によると、気体状の媒体が供給可能な１つまたは各溝は、管を介して、内燃機関の燃焼用空気システムまたは給気システムまたは始動用空気システムに接続されており、それにより、１つまたは各溝に対して燃焼用空気または給気または始動用空気を供給する。   According to a preferred configuration of the invention, the one or each groove capable of supplying a gaseous medium is connected via a tube to the combustion air system or the air supply system or the start air system of the internal combustion engine. Thereby supplying combustion air or charge air or start-up air to one or each groove.

本発明の好適な構成が、従属請求項および以下の説明から明らかになる。本発明の実施形態を詳細に説明するが、本発明はこれに限定されない。   Preferred configurations of the invention emerge from the dependent claims and the following description. Although an embodiment of the present invention is described in detail, the present invention is not limited to this.

図１は、本発明の一実施形態に係る燃料ポンプ１０の横断面を概略的に示している。ここで、図１に係る燃料ポンプは、ポンプシリンダー１１と、ポンプシリンダー１１の切欠き部１２内に移動可能に支持または案内されているポンプピストン１３とを有している。   FIG. 1 schematically shows a cross section of a fuel pump 10 according to an embodiment of the present invention. Here, the fuel pump according to FIG. 1 has a pump cylinder 11 and a pump piston 13 supported or guided movably in the notch 12 of the pump cylinder 11.

図１によると、ポンプピストン１３は、カム１４を介して制御されてポンプシリンダー１１内を上下に移動可能となっている。ここで、燃料は、ポンプシリンダー１１内でのポンプピストン１３のこのような運動によって吸引されて消費装置の方に搬送され得る。   According to FIG. 1, the pump piston 13 is controlled through a cam 14 and can move up and down in the pump cylinder 11. Here, the fuel can be sucked by such a movement of the pump piston 13 in the pump cylinder 11 and transported towards the consuming device.

ポンプシリンダー１１の切欠き部１２には、少なくとも１つの漏洩溝(Leckagenut)が設けられている。図１に示されている実施形態では、２つの漏洩溝１５および１６が、切欠き部１２の領域においてポンプシリンダー１１内に設けられている。   The cutout portion 12 of the pump cylinder 11 is provided with at least one leakage groove. In the embodiment shown in FIG. 1, two leakage grooves 15 and 16 are provided in the pump cylinder 11 in the region of the notch 12.

漏洩溝１５および１６を介して、ポンプシリンダー１１およびポンプピストン１３間に生じる燃料漏れを、燃料供給システムに、かつ／または、減圧下で(druckloss)漏れ還流部(Leckageruecklauf)に排出することができる。図１によると、燃料漏れは、漏洩溝１５および１６から、共通の漏洩管１７を介して排出可能になっている。   Via the leakage grooves 15 and 16, the fuel leakage occurring between the pump cylinder 11 and the pump piston 13 can be discharged to the fuel supply system and / or to the leakage recirculation (Leckageruecklauf) under reduced pressure. . According to FIG. 1, fuel leakage can be discharged from the leakage grooves 15 and 16 via a common leakage pipe 17.

本発明によると、ポンプピストン１３が案内されるポンプシリンダー１１の切欠き部１２の領域には、１つまたは各漏洩溝１５,１６に加えて、さらなる溝が形成されている。この溝には、気体状の媒体を供給することができるようになっている。   According to the invention, in addition to one or each of the leakage grooves 15, 16, further grooves are formed in the region of the notch 12 of the pump cylinder 11 in which the pump piston 13 is guided. A gaseous medium can be supplied to the groove.

図１の実施形態では、この種の溝が一つだけ、ポンプシリンダー１１の切欠き部１２の領域においてポンプシリンダー内に設けられている。   In the embodiment of FIG. 1, only one such groove is provided in the pump cylinder in the region of the notch 12 of the pump cylinder 11.

既に述べたように、溝１８には、気体状の媒体、すなわちバリアガス(Sperrgas)を供給することができる。ここで、気体状の媒体とは、空気または不活性ガスである。内燃機関の燃焼用空気または給気または始動用空気を溝１８に供給することも可能である。   As described above, the groove 18 can be supplied with a gaseous medium, that is, a barrier gas (Sperrgas). Here, the gaseous medium is air or an inert gas. It is also possible to supply the combustion air or supply air or start-up air of the internal combustion engine to the groove 18.

図１によると、気体状の媒体が供給可能な溝１８は、管１９を介して、不図示の気体状の媒体用のリザーバに接続されている。溝１８に対して、内燃機関の燃焼用空気または給気または始動用空気が供給可能である場合には、溝１８は、減圧器を介在させた上で、管１９によって内燃機関の燃焼用空気システムまたは給気用システムまたは始動用空気システムに接続されている。減圧器によって、燃焼用空気または給気または始動用空気の圧力が最大２０バールの圧力まで低減されるので、その結果、溝１８内を占めている圧力は最大２０バールとなる。   According to FIG. 1, the groove 18 through which a gaseous medium can be supplied is connected via a pipe 19 to a reservoir for the gaseous medium (not shown). When combustion air or supply air or start-up air for an internal combustion engine can be supplied to the groove 18, the groove 18 is provided with a pressure reducer and the combustion air for the internal combustion engine through the pipe 19. Connected to system or air supply system or start-up air system. The decompressor reduces the pressure of the combustion air or charge or starting air to a pressure of up to 20 bar, so that the pressure occupying the groove 18 is up to 20 bar.

図１に示されている実施形態では、気体状の媒体が供給可能な溝１８は、両漏洩溝１５および１６下部であってポンプシリンダー１１の下側部分内に設けられている。溝１８を占める圧力は、溝１８と隣接する漏洩溝１６との間に形成される圧力降下の分だけ低減されているとともにこの隣接する漏洩溝１６を占める圧力よりも大きくなるよう選択される。   In the embodiment shown in FIG. 1, the groove 18 through which the gaseous medium can be supplied is provided in the lower part of the pump cylinder 11 below both the leakage grooves 15 and 16. The pressure occupying the groove 18 is selected to be reduced by the pressure drop formed between the groove 18 and the adjacent leakage groove 16 and to be greater than the pressure occupying this adjacent leakage groove 16.

本発明の実施形態に係る本発明の燃料ポンプの概略横断面図である。1 is a schematic cross-sectional view of a fuel pump according to an embodiment of the present invention.

符号の説明Explanation of symbols

１０ 燃料ポンプ
１１ ポンプシリンダー
１２ 切欠き部
１３ ポンプピストン
１４ カム
１５,１６ 漏洩溝
１７ 漏洩管
１８ 溝
１９ 管 DESCRIPTION OF SYMBOLS 10 Fuel pump 11 Pump cylinder 12 Notch 13 Pump piston 14 Cam 15,16 Leakage groove 17 Leakage pipe 18 Groove 19 Pipe 19

Claims (10)

燃料ポンプ、特にコモンレール燃料システムの高圧燃料ポンプであって、
ポンプシリンダー内を案内されるポンプピストンを有し、前記ポンプピストンが中で案内される前記ポンプシリンダーの切欠き部の領域において、少なくとも１つの漏洩溝が形成されており、該漏洩溝を介して、ポンプシリンダーおよびポンプピストン間に生じる燃料漏れが排出可能となっている燃料ポンプにおいて、
前記ポンプピストン(１３)が中で案内される前記ポンプシリンダー(１１)の前記切欠き部(１２)の領域において、気体状の媒体を供給可能な少なくとも１つの溝(１８)が形成されていることを特徴とする燃料ポンプ。 A fuel pump, in particular a high pressure fuel pump of a common rail fuel system,
A pump piston guided in the pump cylinder, wherein at least one leakage groove is formed in the region of the notch of the pump cylinder in which the pump piston is guided; In the fuel pump in which the fuel leakage generated between the pump cylinder and the pump piston can be discharged,
In the region of the notch (12) of the pump cylinder (11) in which the pump piston (13) is guided, at least one groove (18) capable of supplying a gaseous medium is formed. A fuel pump characterized by that. 請求項１に記載の燃料ポンプにおいて、
１つまたは各溝(１８)には空気が供給されるようになっていることを特徴とする燃料ポンプ。 The fuel pump according to claim 1, wherein
A fuel pump characterized in that one or each groove (18) is supplied with air. 請求項１に記載の燃料ポンプにおいて、
１つまたは各溝(１８)には不活性ガスが供給されるようになっていることを特徴とする燃料ポンプ。 The fuel pump according to claim 1, wherein
A fuel pump characterized in that an inert gas is supplied to one or each groove (18). 請求項１ないし請求項３のいずれか１項に記載の燃料ポンプにおいて、
１つまたは各溝(１８)は、管(１９)を介して、気体状の媒体用のリザーバに接続されていることを特徴とする燃料ポンプ。 The fuel pump according to any one of claims 1 to 3,
One or each groove (18) is connected via a pipe (19) to a reservoir for a gaseous medium. 請求項１ないし請求項４のいずれか１項に記載の燃料ポンプにおいて、
１つまたは各溝(１８)は、管(１９)を介して、内燃機関の燃焼用空気システムまたは給気システムに接続されており、それにより、１つまたは各溝(１８)に燃焼用空気または給気を供給するようになっていることを特徴とする燃料ポンプ。 The fuel pump according to any one of claims 1 to 4, wherein
One or each groove (18) is connected via a pipe (19) to the combustion air system or air supply system of the internal combustion engine, so that one or each groove (18) has combustion air in it. A fuel pump characterized by supplying air supply. 請求項５に記載の燃料ポンプにおいて、
１つまたは各溝(１８)と燃焼用空気システムまたは給気システムとの間には、減圧器が介在しており、それにより、１つまたは各溝(１８)に供給すべき燃焼用空気または給気を最大２０バールの圧力まで減少させるようになっていることを特徴とする燃料ポンプ。 The fuel pump according to claim 5, wherein
A pressure reducer is interposed between one or each groove (18) and the combustion air system or supply system, so that the combustion air to be supplied to one or each groove (18) or A fuel pump characterized in that the supply air is reduced to a pressure of up to 20 bar. 請求項１ないし請求項４のいずれか１項に記載の燃料ポンプにおいて、
１つまたは各溝(１８)は、管(１９)を介して内燃機関の始動用空気システムに接続されており、それにより、１つまたは各溝(１８)に始動用空気を供給するようになっていることを特徴とする燃料ポンプ。 The fuel pump according to any one of claims 1 to 4, wherein
One or each groove (18) is connected via pipe (19) to the starter air system of the internal combustion engine so as to supply starter air to one or each groove (18). A fuel pump characterized by that. 請求項７に記載の燃料ポンプにおいて、
１つまたは各溝(１８)と始動用空気システムとの間には、減圧器が介在しており、それにより、１つまたは各溝(１８)に供給すべき始動用空気を最大２０バールの圧力まで減少させるようになっていることを特徴とする燃料ポンプ。 The fuel pump according to claim 7, wherein
A pressure reducer is interposed between one or each groove (18) and the starting air system, so that up to 20 bar of starting air to be supplied to one or each groove (18) can be provided. A fuel pump characterized by being reduced to a pressure. 請求項１ないし請求項８のいずれか１項に記載の燃料ポンプにおいて、
気体状の媒体が供給可能な１つまたは各溝(１８)は、１つまたは各漏洩溝(１５,１６)下部において前記ポンプシリンダー(１１)に設けられていることを特徴とする燃料ポンプ。 The fuel pump according to any one of claims 1 to 8,
One or each groove | channel (18) which can supply a gaseous medium is provided in the said pump cylinder (11) in the lower part of one or each leakage groove | channel (15,16), The fuel pump characterized by the above-mentioned. 請求項１ないし請求項９のいずれか１項に記載の燃料ポンプにおいて、
気体状の媒体が供給可能な１つまたは各溝(１８)を占める圧力は、溝(１８)と隣接する漏洩溝(１６)との間で形成される圧力降下の分だけ減少している前記隣接する漏洩溝(１６)内を占める圧力よりも大きいことを特徴とする燃料ポンプ。 The fuel pump according to any one of claims 1 to 9,
The pressure occupying one or each groove (18) to which the gaseous medium can be supplied is reduced by the pressure drop formed between the groove (18) and the adjacent leakage groove (16). A fuel pump characterized by being larger than the pressure occupying the adjacent leakage groove (16).
JP2007326574A 2006-12-22 2007-12-18 Fuel pump Expired - Fee Related JP4733102B2 (en)

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DE102006061253A DE102006061253A1 (en) 2006-12-22 2006-12-22 High-pressure fuel pump for common-rail fuel injection systems has leakage grooves around bore for piston and additional groove at its base, into which air or inert gas can be injected
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