JP2006257972A - High pressure fuel pump - Google Patents

High pressure fuel pump Download PDF

Info

Publication number
JP2006257972A
JP2006257972A JP2005076709A JP2005076709A JP2006257972A JP 2006257972 A JP2006257972 A JP 2006257972A JP 2005076709 A JP2005076709 A JP 2005076709A JP 2005076709 A JP2005076709 A JP 2005076709A JP 2006257972 A JP2006257972 A JP 2006257972A
Authority
JP
Japan
Prior art keywords
cylinder
fuel
valve
fuel pump
pressure fuel
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.)
Granted
Application number
JP2005076709A
Other languages
Japanese (ja)
Other versions
JP4332898B2 (en
Inventor
Nobuo Ota
信男 太田
Hiroshi Inoue
宏史 井上
Kaoru Oda
薫 小田
Sadatsugu Inaguma
禎次 稲熊
Tatsumi Oguri
立己 小栗
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.)
Denso Corp
Original Assignee
Denso 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 Denso Corp filed Critical Denso Corp
Priority to JP2005076709A priority Critical patent/JP4332898B2/en
Publication of JP2006257972A publication Critical patent/JP2006257972A/en
Application granted granted Critical
Publication of JP4332898B2 publication Critical patent/JP4332898B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Fuel-Injection Apparatus (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive high pressure fuel pump, with reduced number of parts and reduced installation manhours. <P>SOLUTION: A cylinder 12 is made from martensitic stainless steel or the like. The cylinder 12 supports a plunger 40 to be reciprocable, a sliding part 14 of the cylinder 12 slid with the plunger 40 is hardened and formed by induction hardening. A pipe joint 50 as an inlet of fuel, a metering valve 60 and a discharge valve or the like are directly attached to the cylinder 12. A valve member 62 of the metering valve 60 is formed in a shape of a cup, by using magnetic material or using magnetic material whose surface is coated with nonmagnetic material. When electricity for a coil part 76 is turned on, attraction of magnet acts between an attraction part 20 and the valve member 62. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、プランジャの往復移動により加圧室に吸入した燃料を加圧し吐出する高圧燃料ポンプに関するものである。   The present invention relates to a high-pressure fuel pump that pressurizes and discharges fuel sucked into a pressurizing chamber by reciprocating movement of a plunger.

プランジャの往復移動により燃料入口から加圧室に吸入した燃料を加圧し吐出する高圧燃料ポンプが知られている（例えば、特許文献１、２参照）。そして、特許文献１、２では、燃料入口と加圧室との連通を電磁駆動式の調量弁で断続し、燃料吐出量を調量している。このように電磁駆動式の調量弁を用いた高圧燃料ポンプでは、調量弁の磁気回路を構成する部品と、プランジャを往復移動自在に支持するシリンダとを別部品で構成している。これは、磁気回路部品は磁束を通すために磁性材で形成され、プランジャと摺動するシリンダは耐摩耗性を高めるために高硬度の材質で形成されるからである。このように、調量弁の磁気回路部品とシリンダには異なる機能が要求される。   High-pressure fuel pumps that pressurize and discharge fuel sucked from a fuel inlet into a pressurizing chamber by a reciprocating movement of a plunger are known (for example, see Patent Documents 1 and 2). In Patent Documents 1 and 2, the communication between the fuel inlet and the pressurizing chamber is intermittently connected by an electromagnetically driven metering valve to meter the fuel discharge amount. In this way, in the high-pressure fuel pump using the electromagnetically driven metering valve, the components that constitute the magnetic circuit of the metering valve and the cylinder that supports the plunger so as to reciprocate are configured as separate components. This is because the magnetic circuit component is formed of a magnetic material so as to allow magnetic flux to pass, and the cylinder that slides with the plunger is formed of a high-hardness material in order to improve wear resistance. Thus, different functions are required for the magnetic circuit component of the metering valve and the cylinder.

特開２００３−１１３７５９号公報JP 2003-113759 A 特開２００３−２２２０６２号公報JP 2003-222062 A

しかしながら、特許文献１、２のように調量弁の磁気回路部品とシリンダとを別部品で構成すると、高圧燃料ポンプの部品点数が増加する。その結果、部品同士の結合箇所が増加するので、部品同士を結合するためのボルト等の結合部品、またはねじ山等の結合構造が必要になる。また、部品同士の結合箇所をシールするためのシール部品が必要になる。その結果、高圧燃料ポンプの部品点数および組付工数が増加し、高圧燃料ポンプの製造コストが増加する。   However, if the magnetic circuit part of the metering valve and the cylinder are configured as separate parts as in Patent Documents 1 and 2, the number of parts of the high-pressure fuel pump increases. As a result, the number of parts to be joined increases, so that a joining part such as a bolt for joining parts together or a joining structure such as a screw thread is required. In addition, a seal part for sealing the joint portion between the parts is required. As a result, the number of parts and assembly man-hours of the high-pressure fuel pump increase, and the manufacturing cost of the high-pressure fuel pump increases.

本発明は上記問題を解決するためになされたものであり、部品点数および組付工数が減少し安価な高圧燃料ポンプを提供することを目的とする。   The present invention has been made to solve the above problems, and an object thereof is to provide an inexpensive high-pressure fuel pump in which the number of parts and the number of assembly steps are reduced.

請求項１から５記載の発明によると、プランジャを往復移動自在に支持するシリンダが調量弁の磁気回路を構成しているので、高圧燃料ポンプの部品点数が減少する。また、請求項２記載の発明では、シリンダがハウジング本体をなしており、調量弁はシリンダに直接組み付けられている。したがって、高圧燃料ポンプの部品点数がさらに減少する。   According to the first to fifth aspects of the present invention, since the cylinder that supports the plunger so as to be reciprocally movable constitutes the magnetic circuit of the metering valve, the number of parts of the high-pressure fuel pump is reduced. In the invention according to claim 2, the cylinder forms the housing body, and the metering valve is directly assembled to the cylinder. Therefore, the number of parts of the high-pressure fuel pump is further reduced.

そして、高圧燃料ポンプの部品点数が減少することにより、高圧燃料ポンプにおいて、部品同士を結合するための結合部品、あるいは部品同士を結合する結合構造を形成する箇所が減少する。さらに、部品同士の間をシールするシール部品が減少する。したがって、高圧燃料ポンプの部品点数および組付工数が減少し、高圧燃料ポンプの製造コストを低減できる。   Then, as the number of parts of the high-pressure fuel pump is reduced, in the high-pressure fuel pump, the number of parts that form a joint part for joining parts together or a joint structure for joining parts together is reduced. Further, the number of sealing parts that seal between the parts is reduced. Therefore, the number of parts and assembly man-hours of the high pressure fuel pump are reduced, and the manufacturing cost of the high pressure fuel pump can be reduced.

請求項３記載の発明によると、プランジャと摺動するシリンダの摺動部は焼き入れされているので、シリンダの摺動部の硬度が増加し、シリンダの摺動部の摩耗が低減する。
請求項４および５記載の発明によると、可動部材と向き合い可動部材との間に磁気吸引力を発生するシリンダの吸引部の一部を薄肉化するか焼き入れしている。これにより、可動部材を吸引する吸引部の一部が磁気絞りとして機能するので、吸引部からシリンダの吸引部以外の部分に磁束が漏れることを低減できる。その結果、可動部材とシリンダの吸引部との間に働く磁気吸引力が増加する。 According to the third aspect of the present invention, since the sliding portion of the cylinder that slides with the plunger is quenched, the hardness of the sliding portion of the cylinder increases and the wear of the sliding portion of the cylinder decreases.
According to the fourth and fifth aspects of the present invention, a part of the attracting portion of the cylinder that generates the magnetic attraction force between the movable member and the facing movable member is thinned or quenched. Thereby, since a part of attraction | suction part which attracts | sucks a movable member functions as a magnetic aperture, it can reduce that magnetic flux leaks to parts other than the attraction | suction part of a cylinder from an attraction | suction part. As a result, the magnetic attractive force that acts between the movable member and the suction part of the cylinder increases.

本発明の複数の実施形態を図に基づいて説明する。
（第１実施形態）
本発明の第１実施形態による高圧燃料ポンプを図１および図２に示す。高圧燃料ポンプ１０は、例えば、ディーゼルエンジンやガソリンエンジンの燃料噴射弁に燃料を供給する燃料ポンプである。
図１に示すように、高圧燃料ポンプ１０は、シリンダ１２、ハウジングカバー３０、プランジャ４０、配管継手５０、調量弁６０、および吐出弁９０（図２参照）等を備えている。
シリンダ１２およびハウジングカバー３０はポンプハウジングを構成している。シリンダ１２は磁性材であるマルテンサイト系ステンレス等で形成されている。シリンダ１２は、プランジャ４０を往復移動自在に支持しており、プランジャ４０と摺動するシリンダ１２の摺動部１４は高周波焼き入れにより硬化して形成されている。図１において、シリンダ１２を高周波焼き入れして硬化した摺動部１４の範囲は二点鎖線で示されている。そして、シリンダ１２には、燃料入口である配管継手５０、調量弁６０および吐出弁９０等が直接取り付けられている。つまりシリンダ１２は、高圧燃料ポンプ１０のハウジング本体をなしている。 A plurality of embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
A high-pressure fuel pump according to a first embodiment of the present invention is shown in FIGS. The high-pressure fuel pump 10 is, for example, a fuel pump that supplies fuel to a fuel injection valve of a diesel engine or a gasoline engine.
As shown in FIG. 1, the high-pressure fuel pump 10 includes a cylinder 12, a housing cover 30, a plunger 40, a pipe joint 50, a metering valve 60, a discharge valve 90 (see FIG. 2), and the like.
The cylinder 12 and the housing cover 30 constitute a pump housing. The cylinder 12 is formed of martensitic stainless steel, which is a magnetic material. The cylinder 12 supports the plunger 40 so as to be reciprocally movable, and the sliding portion 14 of the cylinder 12 that slides with the plunger 40 is hardened by induction hardening. In FIG. 1, the range of the sliding portion 14 obtained by hardening the cylinder 12 by induction hardening is indicated by a two-dot chain line. The cylinder 12 is directly attached with a pipe joint 50 as a fuel inlet, a metering valve 60, a discharge valve 90, and the like. That is, the cylinder 12 forms a housing body of the high-pressure fuel pump 10.

また、シリンダ１２には、導入通路２０２、吸入通路２１２、加圧室２２０、逃がし通路２２２、吐出通路２３０（図２参照）等が形成されている。吸入室２１０は、シリンダ１２とハウジングカバー３０との間に形成されている。吸入通路２１２は、シリンダ１２の側壁を穿孔して形成されており、ボール８０により穿孔入口が封止されている。導入通路２０２、吸入室２１０、吸入通路２１２、加圧室２２０、吐出通路２３０は、特許請求の範囲に記載した燃料通路を構成している。   The cylinder 12 is formed with an introduction passage 202, a suction passage 212, a pressurizing chamber 220, an escape passage 222, a discharge passage 230 (see FIG. 2), and the like. The suction chamber 210 is formed between the cylinder 12 and the housing cover 30. The suction passage 212 is formed by perforating the side wall of the cylinder 12, and the perforation inlet is sealed with a ball 80. The introduction passage 202, the suction chamber 210, the suction passage 212, the pressurization chamber 220, and the discharge passage 230 constitute a fuel passage described in the claims.

プランジャ４０は、シリンダ１２の摺動部１４に往復移動自在に支持されている。加圧室２２０は、プランジャ４０の往復移動方向の一端側に形成されている。プランジャ４０の他端側に形成されたヘッド４２は、スプリング座４４と結合している。スプリング座４４とシリンダ１２との間にスプリング４６が介装されている。スプリング座４４はスプリング４６の付勢力により図示しないタペットの底部内壁に押し付けられている。このタペットの底部外壁が図示しないカムの回転によりカムと摺動することにより、プランジャ４０は往復移動する。プランジャ４０のヘッド４２側の外周面と、プランジャ４０を収容するシリンダ１２の内周面との間は、オイルシール４８によりシールされている。オイルシール４８は、エンジン内から加圧室２２０へのオイルの侵入を防止し、かつ加圧室２２０からエンジン内への燃料漏れを防止する。プランジャ４０とシリンダ１２との摺動箇所からオイルシール４８側に漏れた燃料は、逃がし通路２２２から低圧側の導入通路２０２に戻される。これにより、オイルシール４８に高圧の燃料圧力が加わることを防止する。   The plunger 40 is supported on the sliding portion 14 of the cylinder 12 so as to be reciprocally movable. The pressurizing chamber 220 is formed on one end side in the reciprocating direction of the plunger 40. A head 42 formed on the other end side of the plunger 40 is coupled to a spring seat 44. A spring 46 is interposed between the spring seat 44 and the cylinder 12. The spring seat 44 is pressed against the inner wall of the bottom of the tappet (not shown) by the urging force of the spring 46. The plunger 40 reciprocates as the bottom outer wall of the tappet slides with the cam by rotation of the cam (not shown). An oil seal 48 seals between the outer peripheral surface of the plunger 40 on the head 42 side and the inner peripheral surface of the cylinder 12 that houses the plunger 40. The oil seal 48 prevents oil from entering the pressurizing chamber 220 from the engine and prevents fuel leakage from the pressurizing chamber 220 into the engine. The fuel leaked from the sliding portion between the plunger 40 and the cylinder 12 to the oil seal 48 side is returned from the escape passage 222 to the introduction passage 202 on the low pressure side. This prevents a high fuel pressure from being applied to the oil seal 48.

配管継手５０は、配管継手５０のボディ５２とシリンダ１２とがねじ結合することにより、導入通路２０２内に組み付けられている。配管継手５０のボディ５２内に導入通路２０２と連通する燃料通路２００が形成されており、この燃料通路２００に燃料フィルタ５４が設置されている。
調量弁６０は、弁部材６２、ガイド６４、スプリング６６、弁座部材６８、電磁駆動部７０等を有している。可動部材である弁部材６２は、例えば、磁性材、または磁性材の表面を非磁性材でコーティングすることによりカップ状に形成されており、ガイド６４により往復移動自在に案内される。スプリング６６は、弁部材６２の吸入室２１０側に設置された弁座部材６８に向けて弁部材６２を付勢している。弁部材６２が弁座部材６８に着座すると、吸入室２１０と吸入通路２１２との連通が遮断される。弁座部材６８はシリンダ１２とねじ結合している。 The pipe joint 50 is assembled in the introduction passage 202 by screwing the body 52 of the pipe joint 50 and the cylinder 12 together. A fuel passage 200 communicating with the introduction passage 202 is formed in the body 52 of the pipe joint 50, and a fuel filter 54 is installed in the fuel passage 200.
The metering valve 60 includes a valve member 62, a guide 64, a spring 66, a valve seat member 68, an electromagnetic drive unit 70, and the like. The valve member 62 that is a movable member is formed in a cup shape by coating the surface of a magnetic material or a magnetic material with a nonmagnetic material, for example, and is guided by a guide 64 so as to be reciprocally movable. The spring 66 urges the valve member 62 toward the valve seat member 68 installed on the suction chamber 210 side of the valve member 62. When the valve member 62 is seated on the valve seat member 68, the communication between the suction chamber 210 and the suction passage 212 is blocked. The valve seat member 68 is screwed to the cylinder 12.

調量弁６０の電磁駆動部７０は、樹脂部７２に中心コア７４およびコイル部７６をインサート成形して形成されている。中心コア７４およびコイル部７６は、弁部材６２に対して吸入室２１０と反対側の加圧室２２０の外周側に設けたシリンダ１２の凹部１８に弁部材６２と同軸上に嵌め込まれている。コイル部７６への通電をオンすると、弁部材６２に対して弁座部材６８と反対側に設けたシリンダ１２の吸引部２０と弁部材６２との間に磁気吸引力が働く。つまり、シリンダ１２は、電磁駆動式の調量弁６０の磁気回路を構成している。   The electromagnetic drive part 70 of the metering valve 60 is formed by insert molding a central core 74 and a coil part 76 in a resin part 72. The central core 74 and the coil portion 76 are fitted coaxially with the valve member 62 in the concave portion 18 of the cylinder 12 provided on the outer peripheral side of the pressurizing chamber 220 opposite to the suction chamber 210 with respect to the valve member 62. When energization of the coil portion 76 is turned on, a magnetic attraction force acts between the attraction portion 20 of the cylinder 12 provided on the opposite side of the valve seat member 68 with respect to the valve member 62 and the valve member 62. That is, the cylinder 12 constitutes a magnetic circuit of the electromagnetically driven metering valve 60.

図２に示すように、燃料出口である吐出弁９０は、ボディ９２、弁部材９４、スプリング９６、弁座部材９７、スプリング座９８を有している。吐出弁９０は、ボディ９２とシリンダ１２とがねじ結合することにより、加圧室２２０と連通している吐出通路２３０内に組み付けられている。スプリング９６は、弁座部材９７に着座する方向に向けて弁部材９４を付勢している。弁部材９４が弁座部材９７に着座すると、吐出通路２３０は閉塞される。スプリング座９８はスプリング９６の一端を係止するとともに、弁部材９４の周囲を覆い、弁部材９４の往復移動を案内している。   As shown in FIG. 2, the discharge valve 90 that is a fuel outlet includes a body 92, a valve member 94, a spring 96, a valve seat member 97, and a spring seat 98. The discharge valve 90 is assembled in a discharge passage 230 communicating with the pressurizing chamber 220 by screwing the body 92 and the cylinder 12 together. The spring 96 urges the valve member 94 in a direction in which the spring 96 is seated on the valve seat member 97. When the valve member 94 is seated on the valve seat member 97, the discharge passage 230 is closed. The spring seat 98 locks one end of the spring 96 and covers the periphery of the valve member 94 to guide the reciprocating movement of the valve member 94.

次に、高圧燃料ポンプ１０の作動について説明する。
（１）吸入行程
プランジャ４０が下降し、加圧室２２０の圧力が低下すると、弁部材６２の上流側である吸入室２１０と下流側である加圧室２２０とから弁部材６２が受ける差圧が変化する。そして、加圧室２２０の燃料圧力により弁部材６２が弁座部材６８に着座する方向に受ける力とスプリング６６の付勢力との和が、吸入室２１０側の燃料圧力により弁部材６２が弁座部材６８から離座する方向に受ける力よりも小さくなると、弁部材６２は弁座部材６８から離座し、弁部材６２に対し弁座部材６８と反対側のシリンダ１２の吸引部２０に係止される。これにより、吸入室２１０から吸入通路２１２を通り加圧室２２０に燃料が吸入される。 Next, the operation of the high pressure fuel pump 10 will be described.
(1) Suction stroke When the plunger 40 descends and the pressure in the pressurizing chamber 220 decreases, the differential pressure that the valve member 62 receives from the suction chamber 210 upstream of the valve member 62 and the pressurization chamber 220 downstream. Changes. Then, the sum of the force received in the direction in which the valve member 62 is seated on the valve seat member 68 by the fuel pressure in the pressurizing chamber 220 and the biasing force of the spring 66 is calculated by the fuel pressure on the suction chamber 210 side. When it becomes smaller than the force received in the direction away from the member 68, the valve member 62 is separated from the valve seat member 68, and is locked to the suction portion 20 of the cylinder 12 on the opposite side of the valve seat member 68 from the valve seat member 68. Is done. As a result, fuel is sucked from the suction chamber 210 through the suction passage 212 into the pressurization chamber 220.

そして、プランジャ４０が下死点に達する前の弁部材６２とシリンダ１２の吸引部２０とが当接している状態でコイル部７６への通電をオンする。弁部材６２とシリンダ１２とが当接しているので、吸引部２０に弁部材６２が係止された調量弁６０の開弁状態を保持するために必要な磁気吸引力は小さくてよい。   Then, energization of the coil portion 76 is turned on in a state where the valve member 62 before the plunger 40 reaches the bottom dead center and the suction portion 20 of the cylinder 12 are in contact with each other. Since the valve member 62 and the cylinder 12 are in contact with each other, the magnetic attraction force necessary for maintaining the valve-opening state of the metering valve 60 in which the valve member 62 is locked to the suction portion 20 may be small.

（２）戻し行程
プランジャ４０が下死点から上死点に向かって上昇しても、コイル部７６への通電はオンされた状態であり、吸引部２０と弁部材６２との間に磁気吸引力が働いているので、弁部材６２は吸引部２０に係止された開弁位置に保持される。これにより、プランジャ４０の上昇により加圧された加圧室２２０の燃料は、吸入通路２１２を通り、調量弁６０から吸入室２１０に戻される。 (2) Return stroke Even when the plunger 40 moves upward from the bottom dead center toward the top dead center, the energization to the coil portion 76 is in an on state, and the magnetic attraction is performed between the suction portion 20 and the valve member 62. Since the force is working, the valve member 62 is held in the valve open position locked to the suction portion 20. As a result, the fuel in the pressurizing chamber 220 pressurized by the rise of the plunger 40 passes through the suction passage 212 and is returned from the metering valve 60 to the suction chamber 210.

（３）加圧行程
戻し行程中にコイル部７６への通電をオフすると、弁部材６２と吸引部２０との間に磁気吸引力が働かなくなる。その結果、弁部材６２が加圧室２２０の燃料圧力により弁座部材６８に着座する方向に受ける力とスプリング６６の付勢力との和が、吸入室２１０側の燃料圧力により弁部材６２が弁座部材６８から離座する方向に受ける力よりも大きくなる。その結果、弁部材６２は差圧により弁座部材６８に着座し、吸入室２１０と吸入通路２１２との連通は遮断される。この状態でプランジャ４０がさらに上死点に向けて上昇すると、加圧室２２０の燃料が加圧され燃料圧力が上昇する。そして、加圧室２２０の燃料圧力が所定圧以上になると、スプリング９６の付勢力に抗して弁部材９４が弁座部材９７から離座し吐出弁９０が開弁する。これにより、加圧室２２０で加圧された燃料は吐出通路２３０を通り吐出弁９０から吐出される。吐出弁９０から吐出された燃料は、図示しない燃料レールに供給されて蓄圧され、燃料噴射弁に供給される。
上記（１）〜（３）の行程を繰り返すことにより、高圧燃料ポンプ１０は吸入した燃料を加圧して吐出する。燃料の吐出量は、調量弁６０のコイル部７６への通電タイミングを制御することにより調量される。 (3) Pressurization stroke When energization of the coil section 76 is turned off during the return stroke, the magnetic attraction force does not work between the valve member 62 and the suction section 20. As a result, the sum of the force received in the direction in which the valve member 62 is seated on the valve seat member 68 by the fuel pressure in the pressurizing chamber 220 and the urging force of the spring 66 is determined by the fuel pressure on the suction chamber 210 side. It becomes larger than the force received in the direction away from the seat member 68. As a result, the valve member 62 is seated on the valve seat member 68 due to the differential pressure, and the communication between the suction chamber 210 and the suction passage 212 is blocked. When the plunger 40 further rises toward the top dead center in this state, the fuel in the pressurizing chamber 220 is pressurized and the fuel pressure rises. When the fuel pressure in the pressurizing chamber 220 becomes equal to or higher than a predetermined pressure, the valve member 94 is separated from the valve seat member 97 against the biasing force of the spring 96, and the discharge valve 90 is opened. As a result, the fuel pressurized in the pressurizing chamber 220 passes through the discharge passage 230 and is discharged from the discharge valve 90. The fuel discharged from the discharge valve 90 is supplied to a fuel rail (not shown), accumulated, and supplied to the fuel injection valve.
By repeating the steps (1) to (3), the high-pressure fuel pump 10 pressurizes and discharges the sucked fuel. The fuel discharge amount is metered by controlling the energization timing to the coil portion 76 of the metering valve 60.

（第２、第３、第４、第５、第６実施形態）
本発明の第２実施形態を図３に、第３実施形態を図４に、第４実施形態を図５に、第５実施形態を図６に、第６実施形態を図７に示す。尚、第１実施形態と実質的に同一構成部分には同一符号を付し説明を省略する。
図３に示す第２実施形態の高圧燃料ポンプ１００では、調量弁６０の弁部材６２に対し中心コア７４およびコイル部７６が偏心して設置されている。その結果、調量弁６０の構成部品の中で占有スペースの大きいコイル部７６の一部がシリンダ１２の側面から外側に突出している。これにより、コイル部７６を収容するために必要なシリンダ１２のスペースが小さくなるので、高圧燃料ポンプ１００を小型化できる。 (Second, third, fourth, fifth and sixth embodiments)
FIG. 3 shows a second embodiment of the present invention, FIG. 4 shows a third embodiment, FIG. 5 shows a fourth embodiment, FIG. 6 shows a fifth embodiment, and FIG. 7 shows a sixth embodiment. In addition, the same code | symbol is attached | subjected to the substantially same component as 1st Embodiment, and description is abbreviate | omitted.
In the high pressure fuel pump 100 of the second embodiment shown in FIG. 3, the central core 74 and the coil portion 76 are eccentrically installed with respect to the valve member 62 of the metering valve 60. As a result, a part of the coil portion 76 having a large occupied space among the components of the metering valve 60 protrudes outward from the side surface of the cylinder 12. Thereby, since the space of the cylinder 12 required in order to accommodate the coil part 76 becomes small, the high pressure fuel pump 100 can be reduced in size.

図４に示す第３実施形態では、吸引部２０の弁部材６２側において吸引部２０が弁部材６２と当接する部分の内周側に凹部２２を設け、吸引部２０の一部に薄肉部２４を形成している。凹部２２の底面はスプリング６６を係止している。また、図５に示す第４実施形態では、吸引部２０のコイル部７６側において吸引部２０が弁部材６２と当接する部分の内周側に相当する部分に凹部２２を設け、吸引部２０の一部に薄肉部２４を形成している。   In the third embodiment shown in FIG. 4, the concave portion 22 is provided on the inner peripheral side of the portion where the suction portion 20 contacts the valve member 62 on the valve member 62 side of the suction portion 20, and the thin portion 24 is formed in a part of the suction portion 20. Is forming. A spring 66 is locked to the bottom surface of the recess 22. Moreover, in 4th Embodiment shown in FIG. 5, the recessed part 22 is provided in the part equivalent to the inner peripheral side of the part in which the suction part 20 contact | abuts the valve member 62 in the coil part 76 side of the suction part 20, A thin portion 24 is formed in a part.

第３実施形態および第４実施形態において吸引部２０の一部に形成した薄肉部２４は磁気絞りとして機能するので、コイル部７６に通電することにより発生する磁束が吸引部２０からシリンダ１２の吸引部２０以外の部分に漏れることを低減する。これにより、弁部材６２とシリンダ１２の吸引部２０との間に流れる磁束を増加し、弁部材６２と吸引部２０との間に働く磁気吸引力を増加できる。   In the third embodiment and the fourth embodiment, the thin portion 24 formed in a part of the suction portion 20 functions as a magnetic diaphragm. Therefore, the magnetic flux generated by energizing the coil portion 76 is attracted from the suction portion 20 to the cylinder 12. Leakage to parts other than the part 20 is reduced. Thereby, the magnetic flux which flows between the valve member 62 and the attraction | suction part 20 of the cylinder 12 can be increased, and the magnetic attraction force which acts between the valve member 62 and the attraction | suction part 20 can be increased.

図６に示す第５実施形態では、吸引部２０が弁部材６２と当接する部分の内周部２６の肉厚全体を焼き入れして磁気特性を低下させている。焼き入れしている範囲は、内周部２６が示す二点鎖線で囲まれた箇所である。その結果、内周部２６は磁気絞りとして機能するので、コイル部７６に通電することにより発生する磁束が吸引部２０からシリンダ１２の吸引部２０以外の部分に漏れることを低減する。これにより、弁部材６２とシリンダ１２の吸引部２０との間に流れる磁束を増加し、弁部材６２と吸引部２０との間に働く磁気吸引力を増加できる。   In the fifth embodiment shown in FIG. 6, the entire thickness of the inner peripheral portion 26 where the suction portion 20 contacts the valve member 62 is quenched to reduce the magnetic characteristics. The quenching range is a portion surrounded by a two-dot chain line indicated by the inner peripheral portion 26. As a result, since the inner peripheral portion 26 functions as a magnetic diaphragm, magnetic flux generated by energizing the coil portion 76 is reduced from leaking from the suction portion 20 to portions other than the suction portion 20 of the cylinder 12. Thereby, the magnetic flux which flows between the valve member 62 and the attraction | suction part 20 of the cylinder 12 can be increased, and the magnetic attraction force which acts between the valve member 62 and the attraction | suction part 20 can be increased.

図７に示す第６実施形態の高圧燃料ポンプ１１０では、シリンダ１１２に設けた挿入部１１４からシリンダ１１２に電磁駆動部７０を挿入している。そして、挿入部１１４に設けた円柱部１１６は、第１実施形態〜第５実施形態における中心コア７４に相当している。このように第６実施形態では、調量弁６０の電磁駆動部７０の中心コアをシリンダ１１２と一体に形成した円柱部１１６で構成しているので、高圧燃料ポンプ１１０の部品点数が減少する。   In the high pressure fuel pump 110 of the sixth embodiment shown in FIG. 7, the electromagnetic drive unit 70 is inserted into the cylinder 112 from the insertion portion 114 provided in the cylinder 112. And the cylindrical part 116 provided in the insertion part 114 is corresponded to the center core 74 in 1st Embodiment-5th Embodiment. As described above, in the sixth embodiment, the central core of the electromagnetic drive unit 70 of the metering valve 60 is configured by the cylindrical portion 116 formed integrally with the cylinder 112, so the number of parts of the high-pressure fuel pump 110 is reduced.

上記複数の実施形態では、プランジャ４０を往復移動自在に支持するシリンダを磁性材で形成し、プランジャ４０と摺動する摺動部１４を焼き入れすることにより、摺動部１４の硬度を増加している。また、シリンダは電磁駆動式の調量弁の磁気回路を構成している。つまりシリンダは、プランジャ４０を支持する摺動部１４と、磁気回路部品という異なる機能を兼ねている。さらに、シリンダは高圧燃料ポンプのハウジング本体をなしており、高圧燃料ポンプの構成部品がシリンダに直接組み付けられている。このように、シリンダが摺動部１４と調量弁６０の磁気回路部品とを兼ね、さらにハウジング本体をなしているので、高圧燃料ポンプの部品点数が減少する。その結果、部品同士の結合箇所が減少するので、高圧燃料ポンプにおいて、部品同士を結合するための結合部品、あるいは部品同士を結合する結合構造を形成する箇所が減少する。さらに、部品同士の間をシールするシール部品が減少する。したがって、高圧燃料ポンプの部品点数および組付工数が減少し、高圧燃料ポンプの製造コストを低減できる。   In the above embodiments, the cylinder that supports the plunger 40 in a reciprocating manner is formed of a magnetic material, and the hardness of the sliding portion 14 is increased by quenching the sliding portion 14 that slides with the plunger 40. ing. The cylinder constitutes the magnetic circuit of an electromagnetically driven metering valve. In other words, the cylinder has a different function of the sliding portion 14 that supports the plunger 40 and a magnetic circuit component. Further, the cylinder forms the housing body of the high-pressure fuel pump, and the components of the high-pressure fuel pump are directly assembled to the cylinder. In this way, the cylinder serves as both the sliding portion 14 and the magnetic circuit component of the metering valve 60, and further forms the housing body, so the number of components of the high-pressure fuel pump is reduced. As a result, since the number of parts to be joined is reduced, the number of parts for joining parts for joining parts or a structure for joining parts to each other is reduced in the high-pressure fuel pump. Further, the number of sealing parts that seal between the parts is reduced. Therefore, the number of parts and assembly man-hours of the high pressure fuel pump are reduced, and the manufacturing cost of the high pressure fuel pump can be reduced.

（他の実施形態）
上記複数の実施形態では、プランジャと摺動するシリンダの摺動部１４の硬度を焼き入れにより増加したが、シリンダの材質によっては焼き入れ処理を施さないことも可能である。
また上記複数の実施形態では、配管継手５０、調量弁６０、吐出弁９０等をシリンダに直接組み付けたが、シリンダが調量弁６０の磁気回路を構成するのであれば、配管継手５０、調量弁６０、吐出弁９０等をシリンダ以外のハウジング部材に組み付けてもよい。 (Other embodiments)
In the above embodiments, the hardness of the sliding portion 14 of the cylinder that slides with the plunger is increased by quenching. However, depending on the material of the cylinder, it is possible to not perform the quenching process.
In the above embodiments, the pipe joint 50, the metering valve 60, the discharge valve 90, and the like are directly assembled to the cylinder. However, if the cylinder constitutes the magnetic circuit of the metering valve 60, the pipe joint 50, the metering valve 60, and the like. The quantity valve 60, the discharge valve 90, etc. may be assembled to a housing member other than the cylinder.

上記第３、第４実施形態では、スプリング６６を係止するため、および燃料をシールするために、吸引部２０の肉厚の一部を残して薄肉部２４を形成して磁気絞りとし、吸引部２０からの磁束の漏れを低減した。これに対し、構成上可能であるなら、弁部材６２が吸引部２０と当接する部分の内周側において吸引部２０を肉厚方向に貫通し、吸引部２０からの磁束の漏れを低減してもよい。   In the third and fourth embodiments, in order to lock the spring 66 and to seal the fuel, the thin portion 24 is formed by leaving a part of the thickness of the suction portion 20 to form a magnetic throttle, and suction is performed. Magnetic flux leakage from the part 20 was reduced. On the other hand, if it is possible in the configuration, the valve member 62 penetrates the suction portion 20 in the thickness direction on the inner peripheral side of the portion where the valve member 62 comes into contact with the suction portion 20 to reduce the leakage of magnetic flux from the suction portion 20. Also good.

また上記第５実施形態では、吸引部２０が弁部材６２と当接する部分の内周部２６の肉厚全体を焼き入れして磁気特性を低下させたが、内周部２６の肉厚の一部だけを焼き入れして磁気絞りとし、磁気特性を低下させてもよい。
また上記複数の実施形態では、加圧室２２０の吸入側の燃料通路を調量弁６０が開閉して燃料を調量したが、調量弁の設置位置はこれに限るものではなく、高圧燃料ポンプの燃料入口と燃料出口との間の燃料通路であればどの位置に調量弁を設置してもよい。例えば、加圧室の吐出側の燃料通路に調量弁を設置して燃料を調量してもよい。 Further, in the fifth embodiment, the entire thickness of the inner peripheral portion 26 where the suction portion 20 contacts the valve member 62 is quenched to reduce the magnetic characteristics. However, the thickness of the inner peripheral portion 26 is reduced. Only the portion may be hardened to form a magnetic diaphragm to reduce the magnetic characteristics.
In the above embodiments, the metering valve 60 opens and closes the fuel passage on the suction side of the pressurizing chamber 220 to meter the fuel. However, the position of the metering valve is not limited to this, and the high pressure fuel is not limited to this. The metering valve may be installed at any position as long as it is a fuel passage between the fuel inlet and the fuel outlet of the pump. For example, the fuel may be metered by installing a metering valve in the fuel passage on the discharge side of the pressurizing chamber.

本発明の第１実施形態による高圧燃料ポンプを示す断面図である。It is sectional drawing which shows the high pressure fuel pump by 1st Embodiment of this invention. 図１のII−II線断面における吐出弁を示す部分断面図である。It is a fragmentary sectional view which shows the discharge valve in the II-II line cross section of FIG. 本発明の第２実施形態による高圧燃料ポンプを示す断面図である。It is sectional drawing which shows the high pressure fuel pump by 2nd Embodiment of this invention. 本発明の第３実施形態による調量弁の周囲を示す断面図である。It is sectional drawing which shows the circumference | surroundings of the metering valve by 3rd Embodiment of this invention. 本発明の第４実施形態による調量弁の周囲を示す断面図である。It is sectional drawing which shows the circumference | surroundings of the metering valve by 4th Embodiment of this invention. 本発明の第５実施形態による調量弁の周囲を示す断面図である。It is sectional drawing which shows the circumference | surroundings of the metering valve by 5th Embodiment of this invention. 本発明の第６実施形態による高圧燃料ポンプを示す断面図である。It is sectional drawing which shows the high pressure fuel pump by 6th Embodiment of this invention.

符号の説明Explanation of symbols

１０、１００、１１０ 高圧燃料ポンプ、１２、１１２ シリンダ、１４ 摺動部、２０ 吸引部、２２ 凹部、２４ 薄肉部、４０ プランジャ、５０ 燃料継手（燃料入口）、６０ 調量弁、６２ 弁部材（可動部材）、７０ 電磁駆動部、７６ コイル部、９０ 吐出弁（燃料出口）、２０２ 導入通路（燃料通路）、２１０ 吸入室（燃料通路）、２１２ 吸入通路（燃料通路）、２２０ 加圧室（燃料通路）、２３０ 吐出通路（燃料通路） 10, 100, 110 High pressure fuel pump, 12, 112 Cylinder, 14 Sliding part, 20 Suction part, 22 Recessed part, 24 Thin part, 40 Plunger, 50 Fuel joint (fuel inlet), 60 Metering valve, 62 Valve member ( (Movable member), 70 electromagnetic drive part, 76 coil part, 90 discharge valve (fuel outlet), 202 introduction passage (fuel passage), 210 suction chamber (fuel passage), 212 suction passage (fuel passage), 220 pressurization chamber ( Fuel passage), 230 Discharge passage (fuel passage)

Claims (5)

シリンダ内に収容されたプランジャが往復移動することにより燃料入口から加圧室に吸入した燃料を加圧し、燃料出口から加圧燃料を吐出する高圧燃料ポンプにおいて、
前記燃料入口と前記燃料出口との間の燃料通路を開閉することにより燃料を調量する可動部材、および前記可動部材を駆動するコイル部を有する調量弁と、
を備え、
前記シリンダは前記調量弁の磁気回路を構成していることを特徴とする高圧燃料ポンプ。 In the high-pressure fuel pump that pressurizes the fuel sucked into the pressurizing chamber from the fuel inlet by reciprocating the plunger accommodated in the cylinder and discharges the pressurized fuel from the fuel outlet,
A movable member for metering fuel by opening and closing a fuel passage between the fuel inlet and the fuel outlet, and a metering valve having a coil portion for driving the movable member;
With
The high-pressure fuel pump, wherein the cylinder constitutes a magnetic circuit of the metering valve. 前記シリンダはハウジング本体をなしており、前記調量弁は前記シリンダに組み付けられていることを特徴とする請求項１記載の高圧燃料ポンプ。   The high-pressure fuel pump according to claim 1, wherein the cylinder forms a housing body, and the metering valve is assembled to the cylinder. 前記プランジャと摺動する前記シリンダの摺動部は、焼き入れ処理が施されていることを特徴とする請求項１または２記載の高圧燃料ポンプ。   The high-pressure fuel pump according to claim 1 or 2, wherein the sliding portion of the cylinder that slides with the plunger is subjected to quenching treatment. 前記可動部材と向き合い前記可動部材との間に磁気吸引力を発生する前記シリンダの吸引部の一部は、薄肉化されていることを特徴とする請求項１から３のいずれか一項記載の高圧燃料ポンプ。   The part of the attracting portion of the cylinder that faces the movable member and generates a magnetic attraction force between the movable member is thinned. High pressure fuel pump. 前記可動部材と向き合い前記可動部材との間に磁気吸引力を発生する前記シリンダの吸引部の一部は、焼き入れ処理が施されていることを特徴とする請求項１〜３のいずれか一項記載の高圧燃料ポンプ。   4. A part of the suction part of the cylinder that faces the movable member and generates a magnetic attractive force between the movable member is quenched. The high-pressure fuel pump described in the item.
JP2005076709A 2005-03-17 2005-03-17 High pressure fuel pump Expired - Fee Related JP4332898B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005076709A JP4332898B2 (en) 2005-03-17 2005-03-17 High pressure fuel pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005076709A JP4332898B2 (en) 2005-03-17 2005-03-17 High pressure fuel pump

Publications (2)

Publication Number Publication Date
JP2006257972A true JP2006257972A (en) 2006-09-28
JP4332898B2 JP4332898B2 (en) 2009-09-16

Family

ID=37097515

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005076709A Expired - Fee Related JP4332898B2 (en) 2005-03-17 2005-03-17 High pressure fuel pump

Country Status (1)

Country Link
JP (1) JP4332898B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012202375A (en) * 2011-03-28 2012-10-22 Denso Corp High-pressure pump
WO2014207520A1 (en) 2013-06-27 2014-12-31 Toyota Jidosha Kabushiki Kaisha High-pressure fuel pump

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012202375A (en) * 2011-03-28 2012-10-22 Denso Corp High-pressure pump
WO2014207520A1 (en) 2013-06-27 2014-12-31 Toyota Jidosha Kabushiki Kaisha High-pressure fuel pump
JP2015010502A (en) * 2013-06-27 2015-01-19 トヨタ自動車株式会社 High pressure fuel pump
CN105339645A (en) * 2013-06-27 2016-02-17 丰田自动车株式会社 High-pressure fuel pump
US10584700B1 (en) 2013-06-27 2020-03-10 Toyota Jidosha Kabushiki Kaisha High-pressure fuel pump
DE112014002994B4 (en) 2013-06-27 2022-08-18 Toyota Jidosha Kabushiki Kaisha High-pressure fuel pump with piston sealing element and return line

Also Published As

Publication number Publication date
JP4332898B2 (en) 2009-09-16

Similar Documents

Publication Publication Date Title
US10316808B2 (en) High pressure fuel supply pump with electromagnetic suction valve
JP4569825B2 (en) High pressure fuel pump
US9528609B2 (en) Valve device and high pressure pump using the same
JP4437552B2 (en) High pressure fuel pump
JP3851056B2 (en) High pressure pump
JP4842361B2 (en) High pressure fuel pump
US7488161B2 (en) High pressure pump having downsized structure
JP5638971B2 (en) Electromagnetic drive device and high-pressure pump
JP2017057832A (en) pump
JP2014167264A (en) Solenoid valve and high-pressure pump using the same
JP5933423B2 (en) High pressure pump
JP4569826B2 (en) High pressure fuel pump
EP1788233B1 (en) High-pressure fuel pump
JP4332898B2 (en) High pressure fuel pump
JP4453015B2 (en) High pressure fuel pump
US8529220B2 (en) High-pressure pump
JP2010174752A (en) Fuel supply pump
JP2013050072A (en) High-pressure pump
JP2012158990A (en) High-pressure pump
JP2005344685A (en) High-pressure pump
JP5481406B2 (en) High pressure pump
JP5370438B2 (en) High pressure pump
JP4655122B2 (en) High-pressure pump fuel introduction method
JP2016176482A (en) Fluid control valve and high-pressure pump
JP5071525B2 (en) High pressure pump

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20070405

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080922

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20080925

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20081106

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20081205

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090128

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090416

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090424

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20090601

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20090614

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120703

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120703

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130703

Year of fee payment: 4

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees