JP2011017332A - Fuel supply device of internal combustion engine - Google Patents

Fuel supply device of internal combustion engine Download PDF

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JP2011017332A
JP2011017332A JP2010022199A JP2010022199A JP2011017332A JP 2011017332 A JP2011017332 A JP 2011017332A JP 2010022199 A JP2010022199 A JP 2010022199A JP 2010022199 A JP2010022199 A JP 2010022199A JP 2011017332 A JP2011017332 A JP 2011017332A
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Prior art keywords
valve
pump
fuel supply
seat
supply device
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Thomas Herman
トーマス・ハーマン
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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
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F02M59/46—Valves
    • F02M59/464—Inlet valves of the check valve type
    • 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
    • F04B53/10—Valves; Arrangement of valves
    • 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
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1087—Valve seats

Abstract

PROBLEM TO BE SOLVED: To provide a new fuel supply device of an internal combustion engine, namely, an improved common rail type fuel supply device.SOLUTION: A suction valve 3 capable of suctioning a fuel to a pump chamber 2 of each high-pressure pump from a low pressure range via the suction valve and a delivery valve 4 capable of conveying the fuel from the pump chamber 2 of each high pressure pump via the delivery valve in the direction of a pressure accumulation system are respectively arranged on each high pressure pump 1 of a pump device. A valve seat 8 of the suction valve 3 or a valve seat 10 of the delivery valve 4 of each high pressure pump 1 are respectively formed with exchangeable seat inserts 11, 12.

Description

本発明は請求項１のおいて書き部に記載の内燃機関の燃料供給装置、すなわちコモンレール式燃料供給装置に関する。   The present invention relates to a fuel supply device for an internal combustion engine, that is, a common rail fuel supply device according to claim 1.

特許文献１には、複数の気筒を備えたエンジン、すなわち重油で運転される船舶用ディーゼルエンジンが開示されており、当該エンジンでは、各気筒にコモンレール式燃料供給装置のインジェクタが配設されている。当該インジェクタを介して、エンジンの各気筒に燃料が噴射可能である。特許文献１に記載されたコモンレール式燃料供給装置は、燃料をコモンレール式燃料供給装置の低圧領域から当該燃料供給装置の高圧領域に運搬するために、複数の高圧ポンプを有するポンプ装置を含んでおり、当該ポンプ装置と前記インジェクタとの間の高圧領域には、恒常的に高圧下に置かれている蓄圧システムが設けられている。当該恒常的に高圧下に置かれている蓄圧システムはコモンレールとも称され、特許文献１によれば、複数の蓄圧ユニットを有し、やはり恒常的に高圧下に置かれている高圧燃料導管を介して、ポンプ装置と接続されている。当該蓄圧システムはさらに、噴射のタイミングに応じて間欠的に高圧下に置かれる高圧燃料導管を介して、前記インジェクタに接続されている。特許文献１に記載のコモンレール式燃料供給装置においては、それぞれの高圧ポンプに吸入弁と送り出し弁が配設されており、個々の吸入弁を介して低圧領域から個々の高圧ポンプのポンプ室に燃料を吸い込み可能であり、送り出し弁を介して個々の高圧ポンプのポンプ室から蓄圧システムの方向に燃料を搬送可能である。   Patent Document 1 discloses an engine having a plurality of cylinders, that is, a marine diesel engine operated with heavy oil. In the engine, an injector of a common rail fuel supply device is provided in each cylinder. . Fuel can be injected into each cylinder of the engine via the injector. The common rail fuel supply device described in Patent Document 1 includes a pump device having a plurality of high pressure pumps for transporting fuel from the low pressure region of the common rail fuel supply device to the high pressure region of the fuel supply device. In the high pressure region between the pump device and the injector, a pressure accumulating system that is constantly placed under high pressure is provided. The accumulator system that is constantly placed under high pressure is also referred to as a common rail. According to Patent Document 1, it has a plurality of accumulator units and is connected via a high-pressure fuel conduit that is also placed constantly under high pressure. And connected to the pump device. The accumulator system is further connected to the injector via a high-pressure fuel conduit that is intermittently placed under high pressure according to the timing of injection. In the common rail fuel supply apparatus described in Patent Document 1, each high-pressure pump is provided with a suction valve and a delivery valve, and fuel is supplied from the low-pressure region to the pump chamber of each high-pressure pump via each suction valve. The fuel can be transported from the pump chambers of the individual high-pressure pumps to the pressure accumulating system via the delivery valve.

それぞれの高圧ポンプの吸入弁と送り出し弁とはそれぞれ、弁座と協働する弁体を備えており、それぞれの高圧ポンプの吸入弁および送り出し弁の弁座は、それぞれの高圧ポンプのポンプシリンダか、あるいは当該ポンプシリンダと協働する個々の高圧ポンプの弁支持体によって形成されている。弁座は運転中に磨耗される。そのために弁座が磨耗している場合は、個々の高圧ポンプの弁支持体および／またはポンプシリンダは交換されなければならず、それは手間がかかるとともにコストが嵩む。   The suction valve and the delivery valve of each high-pressure pump are each provided with a valve body that cooperates with the valve seat. The suction valve and the delivery valve seat of each high-pressure pump are connected to the pump cylinder of the respective high-pressure pump. Or formed by the valve support of an individual high-pressure pump cooperating with the pump cylinder. The valve seat is worn during operation. Therefore, if the valve seat is worn, the individual high-pressure pump valve support and / or pump cylinder must be replaced, which is laborious and costly.

独国特許出願公開第１０２００４０６０００３号明細書German Patent Application Publication No. 102004060003

上記の点に鑑み、本発明は内燃機関の新式の燃料供給装置、すなわち改良されたコモンレール式燃料供給装置を提供することを課題とする。   In view of the above points, an object of the present invention is to provide a new fuel supply device for an internal combustion engine, that is, an improved common rail fuel supply device.

上記の課題は請求項１に記載の燃料供給装置によって解決される。本発明によってそれぞれの高圧ポンプの吸入弁の弁座および／または送り出し弁の弁座は交換可能な座部インサートによって形成されている。   The above problem is solved by the fuel supply device according to claim 1. According to the invention, the valve seat of the intake valve and / or the valve seat of the delivery valve of each high-pressure pump is formed by a replaceable seat insert.

本発明に係る燃料供給装置において高圧ポンプの吸入弁および／または送り出し弁の弁座は別個の部材群として形成されているとともに交換可能である座部インサートによって提供されている。当該座部インサートが磨耗している場合、当該座部インサートはわずかな手間で交換され得る。高圧ポンプのポンプシリンダまたは弁支持体の交換は不要である。これによって当該部材群の寿命を増大させることができる。それによって全体としてコストが削減される。   In the fuel supply device according to the present invention, the valve seat of the intake valve and / or the delivery valve of the high-pressure pump is provided by a seat insert that is formed as a separate member group and is replaceable. If the seat insert is worn, the seat insert can be replaced with little effort. There is no need to replace the pump cylinder or valve support of the high pressure pump. Thereby, the lifetime of the member group can be increased. Thereby, the cost is reduced as a whole.

本発明の好適なさらなる構成は従属請求項および以下の詳細な説明に記載されている。図面を参照しながら以下に本発明の実施の形態をより詳しく説明するが、本発明は当該実施の形態に限定されない。   Preferred further configurations of the invention are described in the dependent claims and in the following detailed description. Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. However, the present invention is not limited to the embodiments.

本発明に係る内燃機関のコモンレール式燃料供給装置の高圧領域を高圧ポンプの領域において示す部分概略図である。1 is a partial schematic view showing a high pressure region of a common rail fuel supply device for an internal combustion engine according to the present invention in a region of a high pressure pump. FIG.

本発明はエンジン、特に重油で運転される船舶用ディーゼルエンジンのコモンレール式燃料供給装置に関する。コモンレール式燃料供給装置は低圧領域および高圧領域を有している。コモンレール式燃料供給装置の高圧領域は、少なくとも一つの高圧ポンプを有するポンプ装置と、少なくとも一つの貯留ユニットを有する蓄圧システムと、を含んでおり、当該ポンプ装置は燃料を低圧領域から高圧領域へと搬送し、少なくとも一つの高圧燃料導管を介して蓄圧システムと接続されている。蓄圧システムと当該蓄圧システムをポンプ装置に接続している単独または個々の高圧燃料導管とは恒常的に高い作用圧力の下に置かれている。燃料は蓄圧システムを起点としてインジェクタを介して気筒に噴射可能であり、個々のインジェクタは少なくとも一つの高圧燃料導管を介して蓄圧システムと接続されており、当該高圧燃料導管はエンジンの噴射のタイミングに応じて間欠的に高圧下に置かれる。   The present invention relates to a common rail fuel supply device for an engine, particularly a marine diesel engine operated with heavy oil. The common rail fuel supply apparatus has a low pressure region and a high pressure region. The high-pressure region of the common rail fuel supply device includes a pump device having at least one high-pressure pump and a pressure accumulation system having at least one storage unit, and the pump device transfers fuel from the low-pressure region to the high-pressure region. It is conveyed and connected to the accumulator system via at least one high-pressure fuel conduit. The accumulator system and the individual or individual high-pressure fuel conduits connecting the accumulator system to the pump device are always under high working pressure. Fuel can be injected into the cylinder via injectors starting from the pressure accumulator system, and each injector is connected to the pressure accumulator system via at least one high pressure fuel conduit, which is connected to the timing of engine injection. In response, it is intermittently placed under high pressure.

図１はコモンレール式燃料供給装置の高圧ポンプ１の部分概略図であって、当該高圧ポンプ１のポンプ室２の領域を示している。本図において吸入弁３を介して燃料供給装置の低圧領域から高圧ポンプ１のポンプ室２に燃料が搬送され、高圧ポンプ１の送り出し弁４を介して、ポンプ室２を起点として燃料供給装置の蓄圧システムの方向に燃料が搬送され
得る。コモンレール式燃料供給装置の個々の高圧ポンプ１には、このような吸入弁３と送り出し弁４とが配設されている。 FIG. 1 is a partial schematic view of a high-pressure pump 1 of a common rail fuel supply apparatus, and shows a region of a pump chamber 2 of the high-pressure pump 1. In this figure, fuel is conveyed from the low pressure region of the fuel supply device to the pump chamber 2 of the high pressure pump 1 through the intake valve 3, and the fuel supply device of the fuel supply device starts from the pump chamber 2 through the delivery valve 4 of the high pressure pump 1. Fuel can be conveyed in the direction of the pressure accumulation system. Each high-pressure pump 1 of the common rail type fuel supply apparatus is provided with such an intake valve 3 and a delivery valve 4.

図１に示す高圧ポンプのポンプ室２は高圧ポンプのいわゆるポンプシリンダ５に組み込まれている。ポンプシリンダ５に対応していわゆる弁支持体６が設けられており、このとき燃料導管への接合部または燃料供給穴を備える部材への接合部が設けられているか、あるいは弁支持体内に特に燃料導管が設けられている。すなわち燃料を低圧領域からポンプ弁３に供給するための燃料導管と、燃料を送り出し弁４から燃料供給装置の蓄圧システムに供給するための燃料導管とである。   A pump chamber 2 of the high-pressure pump shown in FIG. 1 is incorporated in a so-called pump cylinder 5 of the high-pressure pump. A so-called valve support 6 is provided corresponding to the pump cylinder 5, and at this time a connection to the fuel conduit or a member having a fuel supply hole is provided, or in particular the fuel in the valve support. A conduit is provided. That is, a fuel conduit for supplying fuel from the low pressure region to the pump valve 3 and a fuel conduit for supplying fuel from the delivery valve 4 to the pressure accumulation system of the fuel supply device.

高圧ポンプ１に配設されている個々の弁、すなわち吸入弁３と送り出し弁４とはそれぞれ可動な弁体を有しており、当該弁体は定置の弁座と協働する。従って吸入弁３は弁体７を有しており、当該弁体は弁座８と協働する。送り出し弁４は弁体９を有しており、当該弁体は弁座１０と協働する。   The individual valves arranged in the high-pressure pump 1, that is, the suction valve 3 and the delivery valve 4 each have a movable valve body, and the valve bodies cooperate with a stationary valve seat. Therefore, the intake valve 3 has a valve body 7, which cooperates with the valve seat 8. The delivery valve 4 has a valve body 9 that cooperates with the valve seat 10.

本発明において図に示す高圧ポンプ１の吸入弁３の弁座８および／または送り出し弁４の弁座１０はそれぞれ別個の交換可能な座部インサート１１もしくは１２によって形成されている。従って図１において吸入弁３の弁座８は座部インサート１１によって形成され、送り出し弁４の弁座１０は座部インサート１２によって形成されている。   In the present invention, the valve seat 8 of the intake valve 3 and / or the valve seat 10 of the delivery valve 4 of the high-pressure pump 1 shown in the figure are each formed by a separate replaceable seat insert 11 or 12. Accordingly, in FIG. 1, the valve seat 8 of the intake valve 3 is formed by the seat insert 11, and the valve seat 10 of the delivery valve 4 is formed by the seat insert 12.

図１に示す実施の形態において、吸入弁３の弁体７に対する弁座８を提供している吸入弁３の座部インサート１１は、弁支持体６内に形成されている凹所１３に挿入されている。これに対して吸入弁４の弁体９に対する弁座１０を提供している送り出し弁４の座部インサート１２は高圧ポンプ１のポンプシリンダ５内に形成されている凹所１４に挿入されている。   In the embodiment shown in FIG. 1, the seat insert 11 of the intake valve 3 providing a valve seat 8 for the valve body 7 of the intake valve 3 is inserted into a recess 13 formed in the valve support 6. Has been. In contrast, the seat insert 12 of the delivery valve 4 that provides the valve seat 10 for the valve body 9 of the intake valve 4 is inserted into a recess 14 formed in the pump cylinder 5 of the high-pressure pump 1. .

ここで以下の点を指摘したい。すなわち図に示す実施の形態とは異なり、吸入弁３と送り出し弁４との両方の座部インサート１１および１２を、両方ともポンプシリンダ５内に設けられているか、あるいは両方とも弁支持体６内に設けられている凹所にそれぞれ配置することも可能である。吸入弁３の座部インサート１１をポンプシリンダ５内の凹所に配置し、送り出し弁４の座部インサート１２を弁支持体６内の凹所に配置することも可能である。   I would like to point out the following points. That is, unlike the embodiment shown in the figure, both the seat inserts 11 and 12 of the intake valve 3 and the delivery valve 4 are both provided in the pump cylinder 5 or both in the valve support 6. It is also possible to arrange each in a recess provided in the. It is also possible to arrange the seat insert 11 of the intake valve 3 in a recess in the pump cylinder 5 and the seat insert 12 of the delivery valve 4 in a recess in the valve support 6.

座部インサート１１および１２は好適に硬く、高い負荷に耐えうる材料から形成されている。座部インサート１１および１２は好適にセラミック材料から製造されている。   The seat inserts 11 and 12 are preferably hard and formed from a material that can withstand high loads. The seat inserts 11 and 12 are preferably made from a ceramic material.

本発明は以下のような有利点を有する。すなわち高い磨耗を被る吸入弁３と送り出し弁４との弁座８および９が別個の座部インサート１１および１２によって形成されており、当該座部インサートは磨耗した場合に容易に交換可能である。これによって磨耗した弁座は簡単に交換され、これによって高圧ポンプのその他の部材群の寿命を向上させることができる。このように全体としてコストが節約される。   The present invention has the following advantages. That is, the valve seats 8 and 9 of the intake valve 3 and the delivery valve 4 that are subject to high wear are formed by separate seat inserts 11 and 12, which can be easily replaced when worn. As a result, the worn valve seat can be easily replaced, whereby the life of the other members of the high-pressure pump can be improved. Thus, the cost is saved as a whole.

１ 高圧ポンプ、２ ポンプ室、３ 吸入弁、４ 送り出し弁、５ ポンプシリンダ、６ 弁支持体、７，９ 弁体、８，１０ 弁座、１１，１２ 座部インサート、１３，１４ 凹所 DESCRIPTION OF SYMBOLS 1 High pressure pump, 2 Pump chamber, 3 Suction valve, 4 Delivery valve, 5 Pump cylinder, 6 Valve support body, 7, 9 Valve body, 8, 10 Valve seat, 11, 12 Seat part insert, 13, 14 Recess

Claims (7)

エンジンの燃料供給装置、すなわちコモンレール式燃料供給装置であって、低圧領域と、少なくとも一つの高圧ポンプを含むポンプ装置と、を有し、それによって燃料を低圧領域から高圧領域へと搬送し、
当該高圧領域において前記ポンプ装置とシリンダに配設されたインジェクタとの間には、少なくとも一つの貯留ユニットを有するとともに恒常的に高圧下に置かれている蓄圧システムが設けられており、
前記ポンプ装置の個々の高圧ポンプには、吸入弁であって当該吸入弁を介して前記低圧領域から前記個々の高圧ポンプのポンプ室に燃料を吸入可能な吸入弁と、送り出し弁であって当該送り出し弁を介して前記個々の高圧ポンプの前記ポンプ室から前記蓄圧システムの方向に燃料を搬送可能である送り出し弁と、が配設されている燃料供給装置において、
個々の高圧ポンプ（１）の前記吸入弁（３）の弁座（８）および／または前記送り出し弁（４）の弁座（１０）は、それぞれ交換可能な座部インサート（１１，１２）によって形成されていることを特徴とする燃料供給装置。 An engine fuel supply device, that is, a common rail fuel supply device, having a low pressure region and a pump device including at least one high pressure pump, thereby conveying fuel from the low pressure region to the high pressure region;
In the high pressure region, a pressure accumulating system having at least one storage unit and being constantly placed under high pressure is provided between the pump device and the injector disposed in the cylinder.
Each high-pressure pump of the pump device includes a suction valve, a suction valve capable of sucking fuel from the low-pressure region to the pump chamber of the individual high-pressure pump via the suction valve, and a delivery valve. A fuel supply device in which a delivery valve capable of transporting fuel from the pump chambers of the individual high-pressure pumps via the delivery valve in the direction of the pressure accumulation system is provided;
The valve seat (8) of the intake valve (3) and / or the valve seat (10) of the delivery valve (4) of the individual high-pressure pump (1) is respectively replaced by replaceable seat inserts (11, 12). A fuel supply device formed. 個々の高圧ポンプ（１）の前記吸入弁（３）の前記弁座（８）と前記送り出し弁（４）の前記弁座（１０）とは、それぞれ別個の交換可能な座部インサート（１１，１２）によって形成されていることを特徴とする請求項１に記載の燃料供給装置。   The valve seat (8) of the intake valve (3) of the individual high-pressure pump (1) and the valve seat (10) of the delivery valve (4) are each independently replaceable seat inserts (11, 11). 12. The fuel supply device according to claim 1, wherein the fuel supply device is formed according to 12). 前記座部インサート（１２）は、前記送り出し弁（４）の前記弁座（１０）を提供するために前記個々の高圧ポンプのポンプシリンダ（５）の凹所（１４）に挿入されており、
前記座部インサート（１１）は、前記吸入弁（３）の前記弁座（８）を提供するために前記個々の高圧ポンプの前記ポンプシリンダ（５）と協働する弁支持体（６）の凹所（１３）に挿入され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。 The seat insert (12) is inserted into a recess (14) in the pump cylinder (5) of the individual high pressure pump to provide the valve seat (10) of the delivery valve (4);
The seat insert (11) of the valve support (6) cooperating with the pump cylinder (5) of the individual high-pressure pump to provide the valve seat (8) of the intake valve (3). The fuel supply device according to claim 1 or 2, wherein the fuel supply device is inserted into the recess (13). 前記座部インサート（１１）は、前記吸入弁（３）の前記弁座（８）を提供するために、および前記座部インサート（１２）は、前記送り出し弁（４）の前記弁座（１０）を提供するために、それぞれ前記個々の高圧ポンプのポンプシリンダ（５）の凹所に挿入され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。   The seat insert (11) provides the valve seat (8) of the intake valve (3), and the seat insert (12) serves as the valve seat (10) of the delivery valve (4). The fuel supply device according to claim 1, wherein the fuel supply device is inserted into a recess of a pump cylinder of each individual high-pressure pump. 前記座部インサート（１１）は、前記吸入弁（３）の前記弁座（８）を提供するために、および前記座部インサート（１２）は、前記送り出し弁（４）の前記弁座（１０）を提供するために、それぞれ前記個々の高圧ポンプのポンプシリンダ（５）と協働する、前記個々の高圧ポンプの弁支持体（６）の凹所に挿入され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。   The seat insert (11) provides the valve seat (8) of the intake valve (3), and the seat insert (12) serves as the valve seat (10) of the delivery valve (4). ), Each of which is inserted into a recess in the valve support (6) of the individual high-pressure pump, cooperating with the pump cylinder (5) of the individual high-pressure pump. Item 3. The fuel supply device according to Item 1 or 2. 前記座部インサート（１１）は、前記吸入弁（３）の前記弁座（８）を提供するために前記個々の高圧ポンプのポンプシリンダ（５）の凹所に挿入されており、前記座部インサート（１２）は、前記送り出し弁（４）の前記弁座（１０）を提供するために前記個々の高圧ポンプの前記ポンプシリンダと協働する弁支持体（６）の凹所に挿入され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。   The seat insert (11) is inserted into a recess in the pump cylinder (5) of the individual high pressure pump to provide the valve seat (8) of the suction valve (3), The insert (12) is inserted into a recess in the valve support (6) that cooperates with the pump cylinder of the individual high-pressure pump to provide the valve seat (10) of the delivery valve (4). The fuel supply device according to claim 1, wherein the fuel supply device is a fuel supply device. 前記座部インサート（１１）は、前記吸入弁（３）の前記弁座（８）を提供するために、および前記座部インサート（１２）は、前記送り出し弁（４）の前記弁座（１０）を提供するために、それぞれセラミック材料から製造されていることを特徴とする請求項１から６のいずれか一項に記載の燃料供給装置。   The seat insert (11) provides the valve seat (8) of the intake valve (3), and the seat insert (12) serves as the valve seat (10) of the delivery valve (4). The fuel supply device according to any one of claims 1 to 6, wherein each of the fuel supply devices is manufactured from a ceramic material.
JP2010022199A 2009-07-09 2010-02-03 Fuel supply device of internal combustion engine Pending JP2011017332A (en)

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