JP2010180783A - Fuel supply device - Google Patents

Fuel supply device Download PDF

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JP2010180783A
JP2010180783A JP2009025210A JP2009025210A JP2010180783A JP 2010180783 A JP2010180783 A JP 2010180783A JP 2009025210 A JP2009025210 A JP 2009025210A JP 2009025210 A JP2009025210 A JP 2009025210A JP 2010180783 A JP2010180783 A JP 2010180783A
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Prior art keywords
plunger
fuel
fuel supply
diameter portion
cylinder
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JP5071401B2 (en
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Motoshi Fukui
基支 福井
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Denso Corp
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Denso Corp
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Priority to DE201010000276 priority patent/DE102010000276A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44Details, 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
    • F02M59/442Details, 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02Pumps 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
    • F02M59/04Pumps 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
    • F02M59/06Pumps 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 with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44Details, 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404Details or component parts
    • F04B1/0408Pistons

Abstract

<P>PROBLEM TO BE SOLVED: To prevent seizure in a sliding part between a cylinder 21 and a plunger 30. <P>SOLUTION: This fuel supply device is characterized by arranging a conical part 30c gradually diametrically contracting toward a small diameter part 30b from a large diameter part 30a, between the driving side large diameter part 30a and the pressurizing chamber 31 side small diameter part 30b of the plunger 30. The pressurizing chamber 31 side small diameter part 30b of the plunger 30 is occasionally formed by being used as a gripping part when applying abrasion resistant coating to an outer peripheral surface of the plunger 30, and has the effect as well of improving efficiency when forcibly feeding fuel by forming this small diameter part 30b in a pressurizing side tip part. Thus, seizure resistance can be improved by reducing pressing action force by generating centering force by this conical part 30c by forming the conical part 30c between its small diameter part 30b and the driving side large diameter part 30a after forming such a small diameter part 30b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、プランジャを往復運動させて燃料を圧送する燃料供給装置に関するものであり、例えば、ガソリンエンジンやディーゼルエンジンなどの内燃機関に、燃料を噴射圧相当にして供給する燃料供給ポンプに適用して好適である。   The present invention relates to a fuel supply device that reciprocates a plunger to pressure-feed fuel, and is applied to a fuel supply pump that supplies fuel to an internal combustion engine such as a gasoline engine or a diesel engine at an equivalent injection pressure. It is preferable.

従来の燃料供給装置(燃料供給ポンプ)として、例えば下記の特許文献1に示されるものがある。これは、内燃機関に燃料を噴射供給する燃料噴射装置において、カム軸の回転に伴うプランジャの往復動により加圧室の燃料をコモンレールなどの高圧燃料蓄圧器に圧送するものである。この燃料供給ポンプは、図示しないが、ポンプハウジングに取り付けられたシリンダボディにプランジャを摺動可能に保持し、かつプランジャの一端とともに加圧室を形成するシリンダ内周面が設けられている。   As a conventional fuel supply device (fuel supply pump), for example, there is one shown in Patent Document 1 below. This is a fuel injection device that injects and supplies fuel to an internal combustion engine and pumps fuel in a pressurizing chamber to a high-pressure fuel accumulator such as a common rail by reciprocating movement of a plunger accompanying rotation of a camshaft. Although not shown, this fuel supply pump is provided with a cylinder inner peripheral surface that slidably holds a plunger in a cylinder body attached to the pump housing and forms a pressurizing chamber together with one end of the plunger.

また、このシリンダボディには、加圧室で加圧した高圧燃料をコモンレールに供給するための吐出弁装置が設けられている。この吐出弁装置は、加圧室への逆流を防止する吐出弁と、その吐出弁をシリンダボディとの間で高圧シールするためのバルブホルダとを備えており、このバルブホルダは、高圧燃料配管と気密に接続する配管接続部を構成している。また、下記の特許文献2には、シリンダの内周面にリーク回収溝を設け、シリンダとプランジャとの間からの燃料リークを低減して、潤滑油の希釈を抑える構造が示されている。   Further, the cylinder body is provided with a discharge valve device for supplying high-pressure fuel pressurized in the pressurizing chamber to the common rail. The discharge valve device includes a discharge valve that prevents backflow into the pressurizing chamber, and a valve holder for high-pressure sealing the discharge valve between the cylinder body, and the valve holder includes a high-pressure fuel pipe. The pipe connection part is connected in an airtight manner. Patent Document 2 below shows a structure in which a leak recovery groove is provided on the inner peripheral surface of a cylinder to reduce fuel leakage from between the cylinder and the plunger, thereby suppressing dilution of the lubricating oil.

特許第2690734号公報Japanese Patent No. 2690734 特開平05−99097号公報Japanese Patent Laid-Open No. 05-99097

近年、噴射圧の高圧化要求が強まっており、その高圧化したシステムにおいては、シリンダとプランジャとの摺動部に焼き付きが発生するという問題が生じている。その1つの要因として、プランジャがシリンダとのクリアランスの間で傾くことにより、その傾いたプランジャが高圧燃料によって傾いた側のシリンダ内周面に押し付けられるという押し付け作用力がある。   In recent years, there has been an increasing demand for higher injection pressure, and in such a high pressure system, there is a problem that seizure occurs at the sliding portion between the cylinder and the plunger. As one of the factors, there is a pressing force such that when the plunger is inclined between the clearances with the cylinder, the inclined plunger is pressed against the cylinder inner peripheral surface on the inclined side by the high-pressure fuel.

本発明は、このような従来の技術に存在する問題点に着目して成されたものであり、その目的は、シリンダとプランジャとの間の摺動部での焼き付きを防ぐことのできる燃料供給装置を提供することにある。   The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to supply fuel that can prevent seizure at the sliding portion between the cylinder and the plunger. To provide an apparatus.

本発明は上記目的を達成するために、下記の技術的手段を採用する。すなわち、請求項1に記載の発明では、燃料を加圧圧送するために軸方向に往復摺動するプランジャ(30)と、ハウジング(20)に形成されてプランジャ(30)を内周面で摺動可能に保持するとともに、プランジャ(30)の一端面とで加圧室(31)を形成するシリンダ(21)と、ハウジング(20)に設けられて加圧室(31)内の燃料を外部に供給するための配管接続部(24)とを備え、プランジャ(30)の往復摺動によって加圧室(31)に吸入した燃料を、配管接続部(24)を介して外部へ加圧圧送する燃料供給装置において、
プランジャ(30)の駆動側の大径部(30a)と加圧室(31)側の小径部(30b)との間に、大径部(30a)から小径部(30b)ヘ向かって徐々に縮径する円錐部(30c)を設けていることを特徴としている。
In order to achieve the above object, the present invention employs the following technical means. That is, according to the first aspect of the present invention, the plunger (30) that reciprocally slides in the axial direction in order to pressurize and pressurize the fuel, and the plunger (30) formed on the housing (20) are slid on the inner peripheral surface. A cylinder (21) that holds the movable portion and forms a pressurizing chamber (31) with one end face of the plunger (30), and a fuel provided in the pressurizing chamber (31) provided to the housing (20) And a pipe connection part (24) for supplying the fuel to the pressurized chamber (31) by reciprocating sliding of the plunger (30), and the fuel pressurized and sent to the outside through the pipe connection part (24) In the fuel supply device
Gradually, from the large diameter portion (30a) toward the small diameter portion (30b) between the large diameter portion (30a) on the drive side of the plunger (30) and the small diameter portion (30b) on the pressurizing chamber (31) side. A conical portion (30c) having a reduced diameter is provided.

プランジャ(30)の加圧室(31)側の小径部(30b)は、プランジャ(30)の外周面に耐摩耗性のコーティングを施す時の掴み部として用いたことによって形成されることもあるが、加圧側の先端部に、この小径部(30b)を形成することにより、燃料を圧送する際の効率が良くなるという効果もある。   The small-diameter portion (30b) on the pressure chamber (31) side of the plunger (30) may be formed by being used as a grip portion when the outer peripheral surface of the plunger (30) is coated with wear resistance. However, by forming the small diameter portion (30b) at the tip end portion on the pressurizing side, there is also an effect that the efficiency when the fuel is pumped is improved.

この請求項1に記載の発明によれば、このような小径部(30b)を形成したうえ、その小径部(30b)と駆動側の大径部(30a)と間に円錐部(30c)を形成することにより、この円錐部(30c)によってセンタリング力を発生させ、押し付け作用力を低減して耐焼き付き性を向上させることができる。   According to the first aspect of the present invention, such a small diameter portion (30b) is formed, and a conical portion (30c) is provided between the small diameter portion (30b) and the large diameter portion (30a) on the driving side. By forming, a centering force can be generated by the conical portion (30c), the pressing force can be reduced, and the seizure resistance can be improved.

また、請求項2に記載の発明では、請求項1に記載の燃料供給装置において、円錐部(30c)は、長さ(L)が3mm以上であるとともに、片側でのテーパ角度(θ)が0.1度以上且つ[長さ(L)×0.33]度以下であることを特徴としている。   Further, in the invention according to claim 2, in the fuel supply device according to claim 1, the conical portion (30c) has a length (L) of 3 mm or more and a taper angle (θ) on one side. It is characterized by being 0.1 degree or more and [length (L) × 0.33] degree or less.

発明者は、図3に示すように、円錐部(30c)のテーパ角度(θ)と長さ(L)とを可変して計算した場合の数値解析から得られるセンタリング力の変化と、実際の焼き付き試験の結果から換算して算出される焼き付き限界のセンタリング力とから、焼き付きを防止するのに必要な円錐部(30c)のテーパ角度と長さとを導き出している。   As shown in FIG. 3, the inventor changed the centering force obtained from the numerical analysis when the taper angle (θ) and the length (L) of the conical portion (30c) were varied, and the actual The taper angle and length of the conical portion (30c) necessary for preventing seizure are derived from the centering force at the seizure limit calculated by conversion from the seizure test result.

よって、この請求項2に記載の発明によれば、円錐部(30c)を上記したテーパ角度範囲と長さとにすることにより、高圧化したシステムにおいてもプランジャ(30)とシリンダ(21)との焼き付きを防止することができる。   Therefore, according to the second aspect of the present invention, the conical portion (30c) has the above-described taper angle range and length so that the plunger (30) and the cylinder (21) can be connected to each other even in a high pressure system. Burn-in can be prevented.

また、請求項3に記載の発明では、請求項1または2に記載の燃料供給装置において、プランジャ(30)が最も駆動側に位置したときの大径部(30a)と対向するシリンダ(21)の内周面に、プランジャ(30)外周面とシリンダ(21)の内周面との間にリークした燃料を回収して低圧側に戻すためのリーク燃料回収溝(28)を形成していることを特徴としている。   According to a third aspect of the present invention, in the fuel supply device according to the first or second aspect, the cylinder (21) opposed to the large-diameter portion (30a) when the plunger (30) is located closest to the drive side. A leaked fuel recovery groove (28) is formed between the outer peripheral surface of the plunger (30) and the inner peripheral surface of the cylinder (21) for recovering leaked fuel and returning it to the low pressure side. It is characterized by that.

このように、シリンダ(21)の内周面にリーク燃料回収溝(28)を形成する場合は、プランジャ(30)が最も駆動側に位置したときの大径部(30a)と対向する位置、つまりは、請求項1または2の発明で形成した円錐部(30c)に掛からない位置とするものである。   Thus, when the leak fuel recovery groove (28) is formed on the inner peripheral surface of the cylinder (21), the position facing the large-diameter portion (30a) when the plunger (30) is located closest to the drive side, In other words, the position is such that it does not engage with the conical portion (30c) formed in the invention of claim 1 or 2.

この請求項3に記載の発明によれば、円錐部(30c)から余分な燃料のリークを招くことなく、リーク燃料による内燃機関用潤滑油の希釈を低減することができため、内燃機関の潤滑を損なうことはなく、内燃機関の信頼性を向上するとともに、潤滑油の寿命を長くすることができる。なお、特許請求の範囲および上記各手段に記載の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示す一例である。   According to the third aspect of the invention, the dilution of the lubricating oil for the internal combustion engine by the leaked fuel can be reduced without incurring excessive fuel leakage from the conical portion (30c). The reliability of the internal combustion engine can be improved and the life of the lubricating oil can be extended. In addition, the code | symbol in the parenthesis as described in a claim and said each means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

本発明の実施形態に係る燃料供給ポンプ1を示す縦断面図である。1 is a longitudinal sectional view showing a fuel supply pump 1 according to an embodiment of the present invention. 本発明の一実施形態におけるプランジャ30の先端側形状を示す部分拡大模式図である。It is a partial expanded schematic diagram which shows the front end side shape of the plunger 30 in one Embodiment of this invention. 円錐部30cの角度θと長さLとを可変して、発生するセンタリング力を数値解析した結果を示すグラフである。It is a graph which shows the result of having numerically analyzed the centering force which generate | occur | produces by changing angle (theta) and length L of the cone part. 従来のプランジャ30の先端側形状を示す部分拡大模式図である。It is a partial expansion schematic diagram which shows the front end side shape of the conventional plunger 30. FIG.

以下、本発明の一実施形態について図1〜4を用いて詳細に説明する。まず図1は、本発明の実施形態に係る燃料供給ポンプ(燃料供給装置)1を示す縦断面図である。本実施形態は、本発明の一実施形態による燃料供給装置を、車両用のコモンレール式燃料噴射装置に用いられる燃料供給ポンプ1に適用した例にて示す。   Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a longitudinal sectional view showing a fuel supply pump (fuel supply device) 1 according to an embodiment of the present invention. The present embodiment shows an example in which the fuel supply device according to one embodiment of the present invention is applied to a fuel supply pump 1 used in a common rail fuel injection device for a vehicle.

コモンレール式燃料噴射装置は、主に燃料タンク、燃料供給ポンプ1、図示しないコモンレールおよび燃料噴射弁を備えており、燃料供給ポンプ1から供給される高圧燃料をコモンレールで蓄圧するとともに、そのコモンレール内の高圧燃料を内燃機関の各気筒に設けられた燃料噴射弁に分配し、各気筒の燃焼室内に噴射供給するものである。   The common rail fuel injection device mainly includes a fuel tank, a fuel supply pump 1, a common rail (not shown), and a fuel injection valve. The high pressure fuel supplied from the fuel supply pump 1 is accumulated in the common rail, The high pressure fuel is distributed to fuel injection valves provided in each cylinder of the internal combustion engine, and is injected and supplied into the combustion chamber of each cylinder.

燃料タンクおよび燃料供給ポンプ1は、コモンレールおよび燃料噴射弁に高圧燃料を供給する燃料供給装置を構成している。燃料タンクは常圧の燃料を蓄えており、燃料供給ポンプ1は、常圧の燃料を燃料タンクから吸い上げるとともに、その吸い上げた燃料を加圧して圧送することにより、コモンレールへ供給する高圧燃料を形成するものである。   The fuel tank and the fuel supply pump 1 constitute a fuel supply device that supplies high-pressure fuel to the common rail and the fuel injection valve. The fuel tank stores normal-pressure fuel, and the fuel supply pump 1 sucks up the normal-pressure fuel from the fuel tank and pressurizes and pumps the sucked-up fuel to form high-pressure fuel to be supplied to the common rail. To do.

燃料供給ポンプ1は、高圧燃料を圧送する高圧ポンプであり、燃料タンクから図示しない「低圧ポンプ」としてのフィードポンプを経由して吸入された燃料を加圧する。図1に示すように、燃料供給ポンプ1はポンプハウジング10を備えており、ポンプハウジング10の一方の端部にはカム室11が形成されている。カム室11には、図示しないエンジン(内燃機関)によって回転駆動される駆動軸12が収容されている。   The fuel supply pump 1 is a high-pressure pump that pumps high-pressure fuel, and pressurizes fuel sucked from a fuel tank via a feed pump (not shown) as a “low-pressure pump”. As shown in FIG. 1, the fuel supply pump 1 includes a pump housing 10, and a cam chamber 11 is formed at one end of the pump housing 10. The cam chamber 11 houses a drive shaft 12 that is rotationally driven by an engine (internal combustion engine) (not shown).

駆動軸12には、その軸中心12jに対した偏心したカム13が設けられており、駆動軸12とカム13とは一体に形成されている。ポンプハウジング10には、駆動軸12と直交する図1の上下方向において、反カム室側にシリンダボディ20が設けられおり、このシリンダボディ20には、プランジャ30が摺動する孔部としてのシリンダ21が形成されている。なお、ポンプハウジング10およびシリンダボディ20は、本発明で言うハウジングに相当する。   The drive shaft 12 is provided with an eccentric cam 13 with respect to the shaft center 12j, and the drive shaft 12 and the cam 13 are integrally formed. The pump housing 10 is provided with a cylinder body 20 on the side opposite to the cam chamber in the vertical direction of FIG. 1 orthogonal to the drive shaft 12. The cylinder body 20 has a cylinder as a hole portion through which the plunger 30 slides. 21 is formed. The pump housing 10 and the cylinder body 20 correspond to the housing referred to in the present invention.

シリンダ21内にはプランジャ30が、駆動軸12と直交する上下方向での軸方向へ往復摺動可能に支持されている。ポンプハウジング10の内周側とシリンダボディ20との間には、タペット室14が形成されており、その内部にはタペット40が往復移動可能に収容されている。   A plunger 30 is supported in the cylinder 21 so as to be slidable back and forth in the axial direction perpendicular to the drive shaft 12. A tappet chamber 14 is formed between the inner peripheral side of the pump housing 10 and the cylinder body 20, and a tappet 40 is accommodated therein so as to be able to reciprocate.

プランジャ30は、概ね円柱形状に形成されており、そのプランジャ30の一端面(図1での上端面)側には、プランジャ30の一端面とシリンダ21の内周面とで囲まれる加圧室31が形成されている。シリンダボディ20には、図示しない導入管を介して低圧ポンプから燃料が供給され、環状を呈する燃料溜り部23が形成されている。   The plunger 30 is formed in a substantially cylindrical shape, and a pressure chamber surrounded by one end surface of the plunger 30 and the inner peripheral surface of the cylinder 21 on the one end surface (upper end surface in FIG. 1) side of the plunger 30. 31 is formed. The cylinder body 20 is supplied with fuel from a low-pressure pump through an introduction pipe (not shown), and has an annular fuel reservoir 23.

燃料溜り部23は、燃料供給路27を介して、制御弁60内の燃料供給路61に連通している。制御弁60は、加圧室31と燃料溜り部23との連通を断続する電磁弁であり、電磁駆動部62と、この電磁駆動部62によって駆動される弁部材63を有している。弁部材63は、弁座部64に着座可能であり、弁部材63が弁座部64に着座および離座することにより、加圧室31と燃料溜り部23との連通状態が断続される。言い換えると、電磁駆動部62を制御することにより加圧室31へ連通する通路が開閉される。   The fuel reservoir 23 communicates with the fuel supply path 61 in the control valve 60 via the fuel supply path 27. The control valve 60 is an electromagnetic valve that interrupts communication between the pressurizing chamber 31 and the fuel reservoir 23, and includes an electromagnetic drive unit 62 and a valve member 63 that is driven by the electromagnetic drive unit 62. The valve member 63 can be seated on the valve seat portion 64, and the communication state between the pressurizing chamber 31 and the fuel reservoir portion 23 is interrupted when the valve member 63 is seated and separated from the valve seat portion 64. In other words, the passage communicating with the pressurizing chamber 31 is opened and closed by controlling the electromagnetic drive unit 62.

シリンダボディ20には、プランジャ30の上端面と対向する位置に制御弁60の電磁駆動部62がねじ固定されている。この電磁駆動部62は、弁部材63を駆動することにより燃料供給路61と加圧室31とを連通または遮断する。電磁駆動部62への通電タイミングを制御することにより、燃料供給ポンプ1からコモンレールへ吐出される燃料の流量が調整される。   In the cylinder body 20, an electromagnetic drive unit 62 of a control valve 60 is screwed at a position facing the upper end surface of the plunger 30. The electromagnetic drive unit 62 communicates or blocks the fuel supply path 61 and the pressurizing chamber 31 by driving the valve member 63. By controlling the energization timing to the electromagnetic drive unit 62, the flow rate of fuel discharged from the fuel supply pump 1 to the common rail is adjusted.

シリンダボディ20には吐出弁装置(本発明で言う配管接続部)24が設置されており、吐出弁装置24は吐出孔25を介して加圧室31に連通している。加圧室31内で加圧された燃料は、吐出弁装置24の弁部材241をスプリング242の付勢力および吐出孔26内の燃料圧力に抗して開弁し、加圧された高圧の燃料を吐出孔26からコモンレール内へ圧送する。   The cylinder body 20 is provided with a discharge valve device (a pipe connection portion referred to in the present invention) 24, and the discharge valve device 24 communicates with a pressurizing chamber 31 through a discharge hole 25. The pressurized fuel in the pressurizing chamber 31 opens the valve member 241 of the discharge valve device 24 against the urging force of the spring 242 and the fuel pressure in the discharge hole 26, and pressurizes the high-pressure fuel. Is discharged from the discharge hole 26 into the common rail.

プランジャ30の反加圧室側、つまりは駆動側の端部32には、ロアシート33が連結されている。このロアシート33には、スプリング34が当接しており、プランジャ30はロアシート33を介してスプリング34の付勢力によりタペット40に押し付けられている。なお、スプリング34の他方の端部は、アッパシート35に当接しており、スプリング34の加圧室31側への移動が規制されている。   A lower sheet 33 is connected to the end portion 32 of the plunger 30 on the side opposite to the pressure chamber, that is, on the drive side. A spring 34 is in contact with the lower seat 33, and the plunger 30 is pressed against the tappet 40 by the urging force of the spring 34 via the lower seat 33. The other end of the spring 34 is in contact with the upper sheet 35, and movement of the spring 34 toward the pressurizing chamber 31 is restricted.

タペット40は、概ね筒状に形成されており、ポンプハウジング10の支持孔15内に、軸方向に移動可能に支持されている。タペット40は、回転運動を直線運動に変換する回転直線変換機構であり、一端部側がカム13の外周13aに当接し、他端部側がプランジャ30の端部32側を支持することで、カム13の回転に従ってタペット40およびプランジャ30が軸方向移動する。   The tappet 40 is formed in a generally cylindrical shape and is supported in the support hole 15 of the pump housing 10 so as to be movable in the axial direction. The tappet 40 is a rotational linear conversion mechanism that converts rotational motion into linear motion. One end of the tappet 40 abuts on the outer periphery 13 a of the cam 13, and the other end supports the end 32 side of the plunger 30. The tappet 40 and the plunger 30 move in the axial direction according to the rotation of.

また、このタペット40には、支持孔15内の内周面に設けた軸方向溝16に係合する周方向位置決め部48が設けられている。この周方向位置決め部48は、カム13の回転に従って軸方向溝16内を軸方向移動することにより、タペット40の周方向移動を規制している。なお、タペット40の詳細構造については、説明を省略する。以上、燃料供給ポンプ1の基本的構成について説明したが、次に、本実施形態の燃料供給ポンプ1の特徴的な構成と、その効果について説明する。   Further, the tappet 40 is provided with a circumferential positioning portion 48 that engages with the axial groove 16 provided on the inner circumferential surface in the support hole 15. The circumferential positioning portion 48 regulates the circumferential movement of the tappet 40 by moving in the axial direction in the axial groove 16 according to the rotation of the cam 13. Note that a description of the detailed structure of the tappet 40 is omitted. The basic configuration of the fuel supply pump 1 has been described above. Next, the characteristic configuration and effects of the fuel supply pump 1 of the present embodiment will be described.

(特徴的構成)
図2は、本発明の一実施形態におけるプランジャ30の先端側形状を示す部分拡大模式図であり、図3は、円錐部30cの角度θと長さLとを可変して、発生するセンタリング力を数値解析した結果を示すグラフである。また、図4は、従来のプランジャ30の先端側形状を示す部分拡大模式図である。
(Characteristic configuration)
FIG. 2 is a partially enlarged schematic view showing the shape of the distal end side of the plunger 30 in one embodiment of the present invention, and FIG. 3 shows the centering force generated by changing the angle θ and the length L of the conical portion 30c. It is a graph which shows the result of having analyzed numerically. FIG. 4 is a partially enlarged schematic view showing the distal end side shape of the conventional plunger 30.

まず、図4に示すように、従来のプランジャ30は、シリンダボディ20に形成されたシリンダ21内で摺動するため、シリンダ21に対して所定のクリアランスを確保した外径の概ね円柱形状をしている。この、一般外径の部分を大径部30aとする。また、プランジャ30の加圧室31側の先端部には、小径部30bが形成されている。   First, as shown in FIG. 4, the conventional plunger 30 slides in a cylinder 21 formed in the cylinder body 20, and thus has a generally cylindrical shape with an outer diameter that secures a predetermined clearance with respect to the cylinder 21. ing. This general outer diameter portion is referred to as a large diameter portion 30a. A small-diameter portion 30b is formed at the tip of the plunger 30 on the pressurizing chamber 31 side.

この小径部30bは、プランジャ30の外周面に耐摩耗性のコーティングを施す時の掴み部として用いることと、加圧側の先端部に、この小径部30bを形成することによって燃料を圧送する際の効率が良くなるという効果もあって形成されている。また、先の大径部30aと対向しているシリンダ21の内周面には、プランジャ30の外周面とシリンダ21の内周面との間にリークした燃料を回収して低圧側に戻すためのリーク燃料回収溝28を形成している。   The small-diameter portion 30b is used as a grip portion when the outer peripheral surface of the plunger 30 is coated with wear resistance, and when the fuel is pumped by forming the small-diameter portion 30b at the pressure-side tip portion. It is formed with the effect of improving efficiency. Further, the fuel leaked between the outer peripheral surface of the plunger 30 and the inner peripheral surface of the cylinder 21 is collected and returned to the low pressure side on the inner peripheral surface of the cylinder 21 facing the large-diameter portion 30a. The leak fuel collecting groove 28 is formed.

このような、プランジャ30の先端側形状において、本実施形態ではまず、図2に示すように、プランジャ30の駆動側の大径部30aと加圧室31側の小径部30bとの間に、小径部30bヘ向かって徐々に縮径する円錐部30cを設けている。これによれば、上記したような小径部30bを形成したうえ、その小径部30bと駆動側の大径部30aと間に、円錐部30cを形成することにより、プランジャ30に図3のグラフに示すようなセンタリング力を発生させることができる。   In such a distal end side shape of the plunger 30, in this embodiment, as shown in FIG. 2, first, between the large diameter portion 30 a on the driving side of the plunger 30 and the small diameter portion 30 b on the pressurizing chamber 31 side, A conical portion 30c that gradually decreases in diameter toward the small diameter portion 30b is provided. According to this, by forming the small diameter portion 30b as described above and forming the conical portion 30c between the small diameter portion 30b and the large diameter portion 30a on the driving side, the plunger 30 is shown in the graph of FIG. A centering force as shown can be generated.

このセンタリング力は、プランジャ30がシリンダ21とのクリアランスの間で傾いたとしても、円錐部30cがあることによって傾いた側のプランジャ30とシリンダ21との間にも高圧燃料が入り込んで生じるものである。これにより、従来焼き付きの要因となっていたシリンダ21の内周面への押し付け作用力を低減することができ、燃料供給装置1の耐焼き付き性を向上させることができる。   Even if the plunger 30 is inclined between the clearance with the cylinder 21, this centering force is caused by the high pressure fuel entering between the inclined plunger 30 and the cylinder 21 due to the conical portion 30 c. is there. Thereby, the pressing force to the inner peripheral surface of the cylinder 21, which has been a cause of seizing, can be reduced, and seizure resistance of the fuel supply device 1 can be improved.

また、この円錐部30cは、長さL(図2参照)が3mm以上であるとともに、片側でのテーパ角度θ(図2参照)が0.1度以上且つ[長さL×0.33]度以下としている。発明者は、図3のグラフに示すように、円錐部30cのテーパ角度θと、長さLとを可変して計算した場合の数値解析から得られるセンタリング力の変化と、実際の焼き付き試験の結果から換算して算出される焼き付き限界のセンタリング力とから、焼き付きを防止するのに必要な円錐部30cのテーパ角度と長さとを導き出している。   The conical portion 30c has a length L (see FIG. 2) of 3 mm or more, a taper angle θ on one side (see FIG. 2) of 0.1 degrees or more, and [length L × 0.33]. Less than the degree. As shown in the graph of FIG. 3, the inventor changed the centering force obtained from the numerical analysis when the taper angle θ and the length L of the conical portion 30c were varied, and the actual seizure test. The taper angle and length of the conical portion 30c necessary for preventing seizure are derived from the centering force of the seizure limit calculated by conversion from the result.

より具体的には、テーパ角度θを0.1〜4.3度、長さLを1〜7mmと可変して数値解析を行い、図3に示すよう、得られるセンタリング力の変化グラフを得た。また、実際の焼き付き試験の結果から換算して算出される焼き付き限界のセンタリング力は、1000N以上が必要であると言う結果を得た。   More specifically, the numerical analysis is performed by changing the taper angle θ from 0.1 to 4.3 degrees and the length L from 1 to 7 mm, and the obtained centering force change graph is obtained as shown in FIG. It was. Moreover, the result that the centering force of the burn-in limit calculated by converting from the result of the actual burn-in test is required to be 1000 N or more was obtained.

この1000N以上のセンタリング力を得るための角度および長さ範囲として、図3のグラフより、長さLが3mm以上であるとともに、テーパ角度θが0.1度以上且つ[長さL×0.33]度以下としたものである。よって、テーパ角度θの上限は、例えば長さLが3mmであれば1度以下、長さLが5mmであれば≒1.7度以下、長さLが7mmであれば≒2.3度以下となる。円錐部30cをこのテーパ角度範囲と長さとにすることにより、高圧化したシステムにおいてもプランジャ30とシリンダ21との焼き付きを防止することができる。   As the angle and length range for obtaining the centering force of 1000 N or more, the length L is 3 mm or more and the taper angle θ is 0.1 degree or more and [length L × 0. 33] degrees or less. Therefore, the upper limit of the taper angle θ is, for example, 1 degree or less when the length L is 3 mm, ≈1.7 degrees or less when the length L is 5 mm, and ≈2.3 degrees when the length L is 7 mm. It becomes as follows. By making the conical portion 30c have this taper angle range and length, seizure between the plunger 30 and the cylinder 21 can be prevented even in a high pressure system.

また、シリンダ21の内周面にリーク燃料回収溝28を形成する場合は、プランジャ30が最も駆動側に位置したとき(つまりは下降端)における大径部30aと対向するシリンダ21の内周面に、リーク燃料回収溝28を形成している。このように、プランジャ30が最も下がったときにも円錐部30cに掛からない位置としている。   Further, when the leak fuel recovery groove 28 is formed on the inner peripheral surface of the cylinder 21, the inner peripheral surface of the cylinder 21 that faces the large-diameter portion 30a when the plunger 30 is located closest to the drive side (that is, the descending end). In addition, a leak fuel recovery groove 28 is formed. In this way, even when the plunger 30 is lowered most, the position is such that it does not engage the conical portion 30c.

これによれば、円錐部30cから余分な燃料のリークを招くことなく、リーク燃料による内燃機関用潤滑油の希釈を低減することができため、内燃機関の潤滑を損なうことはなく、内燃機関の信頼性を向上するとともに、潤滑油の寿命を長くすることができる。   According to this, since the dilution of the lubricating oil for the internal combustion engine by the leaked fuel can be reduced without causing leakage of excess fuel from the conical portion 30c, the lubrication of the internal combustion engine is not impaired, and the internal combustion engine The reliability can be improved and the life of the lubricating oil can be extended.

(その他の実施形態)
本発明は上述した実施形態に限定されるものではなく、次のように変形または拡張することができる。例えば、上述の実施形態では、焼き付きを防止するために高圧燃料を導入するための形状部を円錐部30cとしたが、大径部30aから小径部30bヘ向かって徐々に縮径する形状部、言い換えれば、小径部30bから大径部30aヘ向かって徐々に拡径する形状部は、円錐面のような直線的な径の変化だけではなく、例えば外径側へ膨らんだR面や内径側へ凹んだR面、もしくは直線的な斜面とR面とが複合された縮径部(拡径部)であっても良い。
(Other embodiments)
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows. For example, in the above-described embodiment, the shape portion for introducing high-pressure fuel to prevent seizure is the conical portion 30c, but the shape portion that gradually decreases in diameter from the large diameter portion 30a toward the small diameter portion 30b, In other words, the shape part that gradually expands from the small diameter part 30b toward the large diameter part 30a is not only a change in linear diameter such as a conical surface, but also, for example, an R surface or an inner diameter side that swells to the outer diameter side It may be a concave surface or a reduced diameter portion (expanded diameter portion) in which a linear slope and the R surface are combined.

1…燃料供給ポンプ(燃料供給装置)
20…シリンダボディ(ハウジング)
21…シリンダ
24…吐出弁装置(配管接続部)
30…プランジャ
30a…大径部
30b…小径部
30c…円錐部
31…加圧室
L…円錐部30cの長さ
θ…テーパ角度
1 ... Fuel supply pump (fuel supply device)
20 ... Cylinder body (housing)
21 ... Cylinder 24 ... Discharge valve device (pipe connection part)
DESCRIPTION OF SYMBOLS 30 ... Plunger 30a ... Large diameter part 30b ... Small diameter part 30c ... Conical part 31 ... Pressurizing chamber L ... Length of conical part 30c (theta) ... Taper angle

Claims (3)

燃料を加圧圧送するために軸方向に往復摺動するプランジャ(30)と、
ハウジング(20)に形成されて前記プランジャ(30)を内周面で摺動可能に保持するとともに、前記プランジャ(30)の一端面とで加圧室(31)を形成するシリンダ(21)と、
前記ハウジング(20)に設けられて前記加圧室(31)内の燃料を外部に供給するための配管接続部(24)とを備え、
前記プランジャ(30)の往復摺動によって前記加圧室(31)に吸入した燃料を、前記配管接続部(24)を介して外部へ加圧圧送する燃料供給装置において、
前記プランジャ(30)の駆動側の大径部(30a)と前記加圧室(31)側の小径部(30b)との間に、前記大径部(30a)から前記小径部(30b)ヘ向かって徐々に縮径する円錐部(30c)を設けていることを特徴とする燃料供給装置。
A plunger (30) that reciprocally slides in the axial direction to pump fuel under pressure;
A cylinder (21) formed on the housing (20) to slidably hold the plunger (30) on an inner peripheral surface and to form a pressure chamber (31) with one end surface of the plunger (30); ,
A pipe connection part (24) provided in the housing (20) for supplying the fuel in the pressurizing chamber (31) to the outside;
In the fuel supply device for pressurizing and feeding the fuel sucked into the pressurizing chamber (31) by the reciprocating sliding of the plunger (30) to the outside through the pipe connecting portion (24),
Between the large-diameter portion (30a) from the large-diameter portion (30a) to the small-diameter portion (30b) between the large-diameter portion (30a) on the driving side of the plunger (30) and the small-diameter portion (30b) on the pressurizing chamber (31) side. A fuel supply device comprising a conical portion (30c) that gradually decreases in diameter toward the end.
前記円錐部(30c)は、長さ(L)が3mm以上であるとともに、片側でのテーパ角度(θ)が0.1度以上且つ[前記長さ(L)×0.33]度以下であることを特徴とする請求項1に記載の燃料供給装置。   The conical portion (30c) has a length (L) of 3 mm or more, a taper angle (θ) on one side of 0.1 degrees or more and [the length (L) × 0.33] degrees or less. The fuel supply apparatus according to claim 1, wherein the fuel supply apparatus is provided. 前記プランジャ(30)が最も駆動側に位置したときの前記大径部(30a)と対向する前記シリンダ(21)の内周面に、前記プランジャ(30)外周面と前記シリンダ(21)の内周面との間にリークした燃料を回収して低圧側に戻すためのリーク燃料回収溝(28)を形成していることを特徴とする請求項1または2に記載の燃料供給装置。   On the inner peripheral surface of the cylinder (21) facing the large diameter portion (30a) when the plunger (30) is located closest to the drive side, the outer peripheral surface of the plunger (30) and the inner surface of the cylinder (21) The fuel supply device according to claim 1 or 2, wherein a leak fuel recovery groove (28) for recovering the leaked fuel and returning it to the low pressure side is formed between the peripheral surface and the peripheral surface.
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KR20170108709A (en) * 2016-03-18 2017-09-27 현대중공업 주식회사 Plunger of Fuel Injection Pump
KR102142174B1 (en) * 2016-03-18 2020-08-06 현대중공업 주식회사 Plunger of Fuel Injection Pump
CN112424467A (en) * 2018-07-12 2021-02-26 罗伯特·博世有限公司 Piston pump, in particular high-pressure fuel pump, for an injection system of an internal combustion engine
JP7155387B2 (en) 2018-07-12 2022-10-18 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Piston pumps, especially high-pressure fuel pumps for injection systems of internal combustion engines
WO2023281937A1 (en) * 2021-07-06 2023-01-12 三菱重工エンジン&ターボチャージャ株式会社 Fuel pump

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