JPH1182237A - Fuel supply device - Google Patents
Fuel supply deviceInfo
- Publication number
- JPH1182237A JPH1182237A JP9240822A JP24082297A JPH1182237A JP H1182237 A JPH1182237 A JP H1182237A JP 9240822 A JP9240822 A JP 9240822A JP 24082297 A JP24082297 A JP 24082297A JP H1182237 A JPH1182237 A JP H1182237A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- chamber
- plunger
- pressure
- valve
- 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
Links
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、燃料供給装置に関
し、特に所定時間当たりの燃料吐出量を増加する燃料供
給装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply device, and more particularly to a fuel supply device for increasing a fuel discharge amount per a predetermined time.
【０００２】[0002]
【従来の技術】従来より、電磁弁の開弁時にプランジャ
が下降することにより燃料加圧室に燃料を吸入し、電磁
弁の閉弁時にプランジャが上昇することにより燃料を加
圧する高圧燃料ポンプとして、特開平８−１４１４０号
公報に開示されているものが知られている。このような
高圧燃料ポンプでは、図７に示すように、電磁弁１１０
の開弁に伴いプランジャ１０１が図７の下方に下降する
と、燃料吸入通路１０２から燃料導入室１０３、電磁弁
１１０の弁部材１１１と弁座１１２との開口部を経て燃
料加圧室１０４に低圧燃料が吸入される。2. Description of the Related Art Conventionally, as a high-pressure fuel pump which draws fuel into a fuel pressurizing chamber by lowering a plunger when an electromagnetic valve is opened, and pressurizes fuel by raising the plunger when the electromagnetic valve is closed. And Japanese Patent Application Laid-Open No. 8-14140 are known. In such a high-pressure fuel pump, as shown in FIG.
When the plunger 101 is moved downward in FIG. 7 with the opening of the valve, low pressure is applied from the fuel suction passage 102 to the fuel pressurizing chamber 104 via the fuel introduction chamber 103, the opening of the valve member 111 of the solenoid valve 110 and the valve seat 112. Fuel is inhaled.
【０００３】しかし、所定時間当たりの高圧燃料ポンプ
１００の燃料吐出量を増加するためにプランジャ１０１
を往復駆動するカムの山数を増加し、プランジャ１０１
の往復移動速度を増加させると、一回の吸入行程当たり
の燃料吸入時間が短縮される。高圧燃料ポンプ１００
は、電磁弁１１０の開弁時に弁部材１１１と弁座１１２
との開口部から燃料加圧室１０４に燃料を吸入する吸入
経路が一経路だけであるから、燃料吸入時間が短縮され
ると吸入不良を起こし必要な燃料量を吸入できない恐れ
がある。吸入不良を回避するためには電磁弁の弁部材の
リフト量を大きくしたり、電磁弁の弁部材のシート径を
大きくして開口面積を大きくすることが考えられるが、
従来の電磁弁の構成を大幅に変更する必要があり、かつ
電磁弁が大型化し製造コストが増加するという問題があ
る。さらに、電磁弁の大型化に伴い電磁弁の応答性が低
下するという問題がある。However, in order to increase the fuel discharge amount of the high-pressure fuel pump 100 per predetermined time, the plunger 101
The number of cams for reciprocating the cam is increased, and the plunger 101 is increased.
When the reciprocating speed of the fuel is increased, the fuel suction time per one suction stroke is reduced. High pressure fuel pump 100
The valve member 111 and the valve seat 112 are opened when the solenoid valve 110 is opened.
There is only one suction path for sucking fuel from the opening into the fuel pressurizing chamber 104, so if the fuel suction time is shortened, suction failure may occur and a required amount of fuel may not be sucked. To avoid poor suction, it is conceivable to increase the lift amount of the valve member of the solenoid valve or to increase the opening area by increasing the seat diameter of the valve member of the solenoid valve.
There is a problem that the configuration of the conventional solenoid valve needs to be largely changed, and the size of the solenoid valve becomes large and the manufacturing cost increases. Further, there is a problem that the responsiveness of the solenoid valve is reduced as the size of the solenoid valve is increased.
【０００４】そこで、燃料吸入時間の短縮に伴う燃料の
吸入不良を回避するために、図８に示すような高圧燃料
ポンプ１２０が考えられる。電磁弁１１０の開弁中にプ
ランジャ１０１が下降すると、燃料吸入通路１２１から
燃料導入室１０３、弁部材１１１と弁座１１２との開口
部を経て燃料加圧室１０４に低圧燃料が吸入されること
に加え、プランジャ１０１が図８に示す位置まで下降す
ると燃料吸入通路１２２から直接燃料加圧室１０４に低
圧燃料が吸入される。これにより燃料の吸入経路が二経
路になるので、燃料吸入時間が短縮されても一回の吸入
行程当たりの燃料吸入量の減少を防止し、所定時間当た
りの燃料吐出量が増加することが望まれる。[0004] In order to avoid poor fuel intake due to shortening of the fuel intake time, a high-pressure fuel pump 120 as shown in FIG. 8 is conceivable. When the plunger 101 descends while the solenoid valve 110 is opened, low-pressure fuel is sucked from the fuel suction passage 121 into the fuel pressurizing chamber 104 through the fuel introduction chamber 103 and the opening between the valve member 111 and the valve seat 112. In addition, when the plunger 101 is lowered to the position shown in FIG. 8, low-pressure fuel is sucked directly from the fuel suction passage 122 into the fuel pressurizing chamber 104. As a result, the fuel intake path is divided into two paths. Therefore, even if the fuel intake time is shortened, it is desirable to prevent a decrease in the fuel intake amount per one intake stroke and increase the fuel discharge amount per predetermined time. It is.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、プラン
ジャ１０１が上昇するのに伴いプランジャ１０１の外壁
が燃料吸入通路１２２を閉塞しないと燃料の加圧圧送行
程が開始されない。さらに、加圧圧送行程においてプラ
ンジャ１０１の外壁により燃料吸入通路１２２を閉塞す
るので、プランジャ１０１が燃料吸入通路１２２を閉塞
してからさらに上昇し、燃料吸入通路１２２に対するシ
ール長が確保されるまでは十分に燃料を加圧できない。
したがって、プランジャ１０１が下死点に達したときの
燃料加圧室１０４の容積に対する燃料吐出量、つまり吐
出効率が低下するという問題がある。However, if the outer wall of the plunger 101 does not block the fuel suction passage 122 as the plunger 101 is raised, the pressurizing and pressure-feeding process of the fuel cannot be started. Further, since the fuel suction passage 122 is closed by the outer wall of the plunger 101 in the pressurizing and pressure feeding process, the plunger 101 further rises after closing the fuel suction passage 122 until the seal length for the fuel suction passage 122 is secured. Fuel cannot be pressurized sufficiently.
Therefore, there is a problem that the fuel discharge amount relative to the volume of the fuel pressurizing chamber 104 when the plunger 101 reaches the bottom dead center, that is, the discharge efficiency is reduced.
【０００６】本発明の目的は、簡単な構造で大型化する
ことなく所定時間当たりの燃料吐出量を増加可能な燃料
供給装置を提供することにある。An object of the present invention is to provide a fuel supply device which has a simple structure and can increase the amount of fuel discharged per predetermined time without increasing the size.
【０００７】[0007]
【課題を解決するための手段】本発明の請求項１記載の
燃料供給装置によると、燃料吸入行程において、燃料導
入室から電磁弁の開口部を経て燃料加圧室に低圧燃料を
吸入する第１の吸入経路と、逆止弁の開口部を経て燃料
吸入通路の低圧燃料を燃料加圧室に吸入する第２の吸入
経路とを有している。燃料加圧室への燃料吸入経路が二
経路になるので、カムの山数の増加等によりプランジャ
の往復移動速度を上昇しても、装置全体の体格を大きく
することなく製造コストの増加を防止し、簡単な構成で
一回の吸入行程当たりに必要な燃料吸入量を確保するこ
とができる。According to the fuel supply apparatus of the first aspect of the present invention, in the fuel suction stroke, the low pressure fuel is sucked from the fuel introduction chamber into the fuel pressurizing chamber via the opening of the solenoid valve. The first suction passage includes a second suction passage for sucking the low-pressure fuel in the fuel suction passage into the fuel pressurization chamber through the opening of the check valve. Since there are two fuel suction paths to the fuel pressurizing chamber, even if the reciprocating speed of the plunger is increased due to an increase in the number of cam ridges, etc., an increase in manufacturing cost is prevented without increasing the size of the entire apparatus. In addition, with a simple configuration, it is possible to secure a required fuel intake amount per one intake stroke.
【０００８】さらに、プランジャが上昇し電磁弁が閉弁
して燃料加圧室の燃料が加圧されると燃料吸入通路に設
けた逆止弁が閉弁するので、電磁弁の閉弁に伴い加圧圧
送行程が速やかに開始する。これにより、所定時間当た
りの燃料吐出量を増加することができる。本発明の請求
項２記載の燃料供給装置によると、燃料導入室が電磁弁
と接して設けられ、燃料吸入通路が燃料導入室と連通し
ている。つまり、燃料吸入通路に向けて燃料導入室内を
比較的低温の吸入燃料が流れることにより電磁弁のソレ
ノイド部が冷却されるので、温度上昇に伴う電磁弁の作
動不良を防止することができる。Further, when the plunger rises, the solenoid valve closes, and the fuel in the fuel pressurizing chamber is pressurized, the check valve provided in the fuel suction passage closes. The pressurizing and feeding process starts immediately. This makes it possible to increase the fuel discharge amount per predetermined time. According to the fuel supply device of the second aspect of the present invention, the fuel introduction chamber is provided in contact with the solenoid valve, and the fuel suction passage communicates with the fuel introduction chamber. That is, since the solenoid portion of the solenoid valve is cooled by the relatively low temperature of the suction fuel flowing through the fuel introduction chamber toward the fuel suction passage, malfunction of the solenoid valve due to the temperature rise can be prevented.
【０００９】本発明の請求項３記載の燃料供給装置によ
ると、燃料吸入通路がシリンダ部のプランジャとの非摺
動部に開口しているので、燃料吸入通路がプランジャの
移動位置に係わらず閉塞されない。したがって、プラン
ジャの下降に伴い燃料吸入通路から十分な燃料量を吸入
することができる。According to the fuel supply device of the third aspect of the present invention, since the fuel suction passage is opened at the non-slidable portion of the cylinder portion with the plunger, the fuel suction passage is closed regardless of the movement position of the plunger. Not done. Therefore, a sufficient amount of fuel can be sucked from the fuel suction passage as the plunger moves down.
【００１０】[0010]
【発明の実施の形態】以下、本発明の実施の形態を示す
複数の実施例について図面に基づいて説明する。 （第１実施例）本発明の第１実施例による燃料供給装置
としての高圧燃料ポンプを図１に示す。高圧燃料ポンプ
１は、図示しない低圧ポンプにより図示しない燃料タン
クから汲み上げられた低圧燃料を吸入し、高圧燃料ポン
プ１で加圧した高圧燃料を図示しない分配管に供給す
る。分配管には燃料噴射装置としての気筒数分のインジ
ェクタが取り付けられている。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; (First Embodiment) FIG. 1 shows a high-pressure fuel pump as a fuel supply device according to a first embodiment of the present invention. The high-pressure fuel pump 1 sucks low-pressure fuel pumped from a fuel tank (not shown) by a low-pressure pump (not shown), and supplies the high-pressure fuel pressurized by the high-pressure fuel pump 1 to a distribution pipe (not shown). The injectors for the number of cylinders as fuel injectors are attached to the distribution pipe.
【００１１】高圧燃料ポンプ１のハウジング１１内にシ
リンダ部としてのシリンダ１２が固定されている。シリ
ンダ１２の小径部１２ａはプランジャ１３と摺動し、小
径部１２ａがプランジャ１３を往復移動自在に支持して
いる。プランジャ１３はスプリング１４により図１の下
方に付勢されており、図１の下方に位置する図示しない
例えば４山のカムにより往復駆動される。A cylinder 12 as a cylinder portion is fixed in a housing 11 of the high-pressure fuel pump 1. The small-diameter portion 12a of the cylinder 12 slides with the plunger 13, and the small-diameter portion 12a supports the plunger 13 in a reciprocating manner. The plunger 13 is urged downward by a spring 14 in FIG. 1, and is reciprocated by, for example, a four-lobe cam (not shown) located below in FIG.
【００１２】シリンダ１２の内壁によりプランジャ１３
の端部に燃料加圧室１５が形成されている。プランジャ
１３の下降により燃料加圧室１５に吸入された低圧燃料
は、プランジャ１３の上昇により加圧される。電磁弁２
０はハウジング１１の上方に配設されており、電磁弁２
０とハウジング１１との間に燃料導入室としての環状燃
料室２５が形成されている。ソレノイド部２３への通電
オフ時、弁部材２１はスプリング２２により図１の下方
に付勢されており、電磁弁２０は開弁している。このと
き、環状燃料室２５と燃料加圧室１５とは連通してい
る。電磁弁２０の開弁時に環状燃料室２５から電磁弁２
０の開口部を経て燃料加圧室１５に低圧燃料を吸入する
経路は第１の吸入経路を構成している。ソレノイド部２
３への通電をオンすると、スプリング２２の付勢力に抗
して弁部材２１が上方に吸引され弁座２４に着座する。
すると、環状燃料室２５と燃料加圧室１５との連通が遮
断される。The plunger 13 is formed by the inner wall of the cylinder 12.
A fuel pressurizing chamber 15 is formed at one end of the fuel pressurizing chamber. The low-pressure fuel drawn into the fuel pressurizing chamber 15 by the lowering of the plunger 13 is pressurized by the raising of the plunger 13. Solenoid valve 2
0 is disposed above the housing 11, and the solenoid valve 2
An annular fuel chamber 25 as a fuel introduction chamber is formed between the housing 0 and the housing 11. When the power to the solenoid 23 is turned off, the valve member 21 is urged downward in FIG. 1 by the spring 22 and the solenoid valve 20 is open. At this time, the annular fuel chamber 25 and the fuel pressurizing chamber 15 are in communication. When the solenoid valve 20 is opened, the solenoid valve 2 is removed from the annular fuel chamber 25.
The path through which the low-pressure fuel is sucked into the fuel pressurizing chamber 15 through the opening 0 constitutes a first suction path. Solenoid part 2
When the power is turned on to the valve 3, the valve member 21 is sucked upward against the urging force of the spring 22 and seats on the valve seat 24.
Then, the communication between the annular fuel chamber 25 and the fuel pressurizing chamber 15 is cut off.
【００１３】燃料吸入通路３０は燃料吸入通路３１と燃
料吸入通路３２とに分岐している。燃料吸入通路３１は
環状燃料室２５と連通している。燃料吸入通路３２はシ
リンダ１２の非摺動部としての大径部１２ｂに開口して
燃料加圧室１５と連通しており、燃料加圧室１５から燃
料吸入通路３２への燃料の逆流を防止する逆止弁４０が
燃料吸入通路３２に配設されている。逆止弁４０の開口
部を経て燃料吸入通路３２内の低圧燃料を燃料加圧室１
５に吸入する経路は第２の吸入経路を構成している。シ
リンダ１２の大径部１２ｂは小径部１２ａよりも大径で
あるため、プランジャ１３と摺動しない。したがって、
プランジャ１３の上昇側端面が燃料吸入通路３２よりも
図１の上方に移動しても燃料吸入通路３２はプランジャ
１３に閉塞されない。The fuel intake passage 30 branches into a fuel intake passage 31 and a fuel intake passage 32. The fuel suction passage 31 communicates with the annular fuel chamber 25. The fuel suction passage 32 opens to the large-diameter portion 12 b as a non-sliding portion of the cylinder 12 and communicates with the fuel pressurizing chamber 15 to prevent backflow of fuel from the fuel pressurizing chamber 15 to the fuel suction passage 32. A check valve 40 is disposed in the fuel suction passage 32. The low-pressure fuel in the fuel suction passage 32 is supplied to the fuel pressurizing chamber 1 through the opening of the check valve 40.
The path inhaling to 5 constitutes a second suction path. Since the large diameter portion 12b of the cylinder 12 has a larger diameter than the small diameter portion 12a, it does not slide with the plunger 13. Therefore,
Even if the rising end surface of the plunger 13 moves upward in FIG. 1 from the fuel intake passage 32, the fuel intake passage 32 is not closed by the plunger 13.
【００１４】燃料吐出通路３３は燃料加圧室１５に連通
しており、燃料吐出通路３３にデリバリバルブ４１が配
設されている。デリバリバルブ４１は燃料加圧室１５の
燃圧が所定圧以上に上昇すると開弁し、燃料吐出通路３
３から高圧燃料が分配管に供給される。燃料排出通路３
４は環状燃料室２５に連通しており、燃料排出通路３４
にプレッシャレギュレータ４２が配設されている。プレ
ッシャレギュレータ４２は、燃料吸入通路３１から環状
燃料室２５に導入される燃料の圧力が所定圧以上になる
と開弁して余剰燃料を図示しない燃料タンクにリターン
し、環状燃料室２５の燃圧を必要圧力にせしめる機能を
有する。The fuel discharge passage 33 communicates with the fuel pressurizing chamber 15, and a delivery valve 41 is provided in the fuel discharge passage 33. The delivery valve 41 opens when the fuel pressure in the fuel pressurization chamber 15 rises above a predetermined pressure, and the delivery valve 3 opens.
From 3, high-pressure fuel is supplied to the distribution pipe. Fuel discharge passage 3
Numeral 4 communicates with the annular fuel chamber 25 and a fuel discharge passage 34
Is provided with a pressure regulator 42. The pressure regulator 42 opens when the pressure of the fuel introduced from the fuel suction passage 31 into the annular fuel chamber 25 becomes equal to or higher than a predetermined pressure, returns excess fuel to a fuel tank (not shown), and requires the fuel pressure of the annular fuel chamber 25. It has the function of reducing pressure.
【００１５】次に、高圧燃料ポンプ１の作動について説
明する。 (1) 吸入行程 ソレノイド部２３への通電オフ中、弁部材２１は弁座２
４から離座し電磁弁２０は開弁している。この状態でプ
ランジャ１３が下死点に向けて下降すると燃料加圧室１
５の容積が増大するので、環状燃料室２５から弁部材
２１と弁座２４との開口部を通る経路と、燃料吸入通
路３２を通る経路との二経路から低圧燃料が燃料加圧室
１５に吸入される。吸入行程において逆止弁４０は開弁
している。Next, the operation of the high-pressure fuel pump 1 will be described. (1) Suction stroke While the power to the solenoid 23 is turned off, the valve member 21
4 and the solenoid valve 20 is open. When the plunger 13 descends toward the bottom dead center in this state, the fuel pressurizing chamber 1
5, the low-pressure fuel flows into the fuel pressurizing chamber 15 from two paths, a path passing through the opening of the valve member 21 and the valve seat 24 from the annular fuel chamber 25 and a path passing through the fuel suction passage 32. Inhaled. The check valve 40 is open during the suction stroke.
【００１６】(2) 加圧圧送行程 プランジャ１３が下死点に達した後、上死点に向けて上
昇する行程において所望の燃料吐出量に対応した位置に
プランジャ１３が到達したとき、ソレノイド部２３への
通電をオンする。ソレノイド部２３への通電オンにより
発生した磁力により弁部材２１がスプリング２３の付勢
力に抗してリフトし弁座２４に着座し電磁弁２０が閉弁
すると、環状燃料室２５と燃料加圧室１５との連通が遮
断される。さらにプランジャ１３が上昇すると、逆止弁
３２が閉弁しプランジャ１３の上昇に伴い燃料加圧室１
５内の燃料が加圧される。燃料加圧室１５内の燃圧が所
定圧以上になるとデリバリバルブ４１が開弁し、燃料吐
出通路３３から高圧燃料が吐出され、分配管に圧送され
る。(2) Pressurizing and pressure-feeding stroke After the plunger 13 reaches the bottom dead center, when the plunger 13 reaches a position corresponding to a desired fuel discharge amount in a stroke rising toward the top dead center, the solenoid unit The power supply to 23 is turned on. When the valve member 21 is lifted against the urging force of the spring 23 by the magnetic force generated by the energization of the solenoid 23 and is seated on the valve seat 24 and the solenoid valve 20 is closed, the annular fuel chamber 25 and the fuel pressurizing chamber are closed. Communication with 15 is interrupted. When the plunger 13 further rises, the check valve 32 closes and the fuel pressurizing chamber 1
The fuel in 5 is pressurized. When the fuel pressure in the fuel pressurization chamber 15 becomes equal to or higher than a predetermined pressure, the delivery valve 41 is opened, high-pressure fuel is discharged from the fuel discharge passage 33, and fed to the distribution pipe.
【００１７】第１実施例では、電磁弁２０の開弁時に環
状燃料室２５から電磁弁２０の弁部材２１と弁座２４と
の開口部を通って燃料加圧室１５に低圧燃料を吸入する
第１の吸入経路に加え、逆止弁４０の開口部を経て燃料
吸入通路３２内の低圧燃料を燃料加圧室１５に直接吸入
する第２の吸入経路を設けている。したがって、所定時
間当たりの燃料吐出量を増加するためにカムの山数を増
加してプランジャ１３の往復移動速度を上昇しても、一
回当たりの吸入行程で必要な燃料量を吸入できる。しか
も、燃料加圧室１５と連通する燃料吸入通路３２を追加
し、この燃料吸入通路３２に逆止弁４０を設けるという
簡単な構成で燃料吐出量を増加できるので、高圧燃料ポ
ンプの体格を大型化することなく製造コストの上昇を抑
えることができる。In the first embodiment, when the solenoid valve 20 is opened, low-pressure fuel is sucked from the annular fuel chamber 25 into the fuel pressurizing chamber 15 through the opening of the valve member 21 and the valve seat 24 of the solenoid valve 20. In addition to the first suction path, a second suction path for directly sucking the low-pressure fuel in the fuel suction passage 32 into the fuel pressurizing chamber 15 via the opening of the check valve 40 is provided. Therefore, even if the number of cam ridges is increased to increase the fuel discharge amount per predetermined time and the reciprocating speed of the plunger 13 is increased, the required fuel amount can be sucked in one suction stroke. In addition, the fuel discharge amount can be increased with a simple configuration in which the fuel suction passage 32 communicating with the fuel pressurizing chamber 15 is added and the check valve 40 is provided in the fuel suction passage 32, so that the size of the high-pressure fuel pump is increased. It is possible to suppress an increase in the manufacturing cost without making the structure.
【００１８】（第２実施例）本発明の第２実施例を図２
に示す。第１実施例と実質的に同一構成部分には同一符
号を付す。燃料吸入通路５０は環状燃料室２５に連通し
ている。燃料吸入通路５１は、燃料吸入通路５０の環状
燃料室２５との連通部とほぼ径方向反対側で環状燃料室
２５と連通し、環状燃料室２５と燃料加圧室１５とを連
通している。逆止弁４０は燃料吸入通路５１に設けられ
ている。逆止弁４０の開口部を経て燃料吸入通路５１内
の低圧燃料を燃料加圧室１５に吸入する経路は第２の吸
入経路を構成している。(Second Embodiment) FIG. 2 shows a second embodiment of the present invention.
Shown in Components substantially the same as those in the first embodiment are denoted by the same reference numerals. The fuel suction passage 50 communicates with the annular fuel chamber 25. The fuel suction passage 51 communicates with the annular fuel chamber 25 on a substantially radially opposite side of a communication portion of the fuel suction passage 50 with the annular fuel chamber 25, and communicates the annular fuel chamber 25 with the fuel pressurizing chamber 15. . The check valve 40 is provided in the fuel suction passage 51. The path through which the low-pressure fuel in the fuel suction passage 51 is sucked into the fuel pressurizing chamber 15 through the opening of the check valve 40 constitutes a second suction path.
【００１９】第２実施例では、環状燃料室２５を通る燃
料は、電磁弁２０の弁部材２１と弁座２４との開口部を
経て燃料加圧室１５に吸入される燃料と、燃料吸入通路
５１から燃料加圧室１５に吸入される燃料と、燃料吐出
通路３３を経てポンプ外へ排出される燃料、つまりはポ
ンプに供給されるすべての燃料である。この多量の燃料
が電磁弁２０に接触してから燃料吸入通路５１に供給さ
れる。これにより、電磁弁２０のソレノイド部２３が燃
料により冷却されるので、温度上昇に伴う電磁弁２０の
作動不良を防止することができる。In the second embodiment, the fuel passing through the annular fuel chamber 25 is supplied to the fuel pressurizing chamber 15 through the opening of the valve member 21 and the valve seat 24 of the solenoid valve 20, and the fuel suction passage. The fuel sucked from the fuel injection chamber 51 into the fuel pressurizing chamber 15 and the fuel discharged from the pump through the fuel discharge passage 33, that is, all the fuel supplied to the pump. This large amount of fuel is supplied to the fuel suction passage 51 after coming into contact with the solenoid valve 20. Thus, the solenoid 23 of the solenoid valve 20 is cooled by the fuel, so that malfunction of the solenoid valve 20 due to a rise in temperature can be prevented.
【００２０】（第３実施例）本発明の第３実施例を図３
に示す。第２実施例と実質的に同一構成部分には同一符
号を付す。第２実施例ではプレッシャレギュレータ４２
を高圧燃料ポンプ２のハウジング１１に直接取り付けた
が、第３実施例では高圧燃料ポンプ３に接続している燃
料配管にプレッシャレギュレータ４２を取付けている。
これにより、高圧燃料ポンプ３周囲の専有スペースを小
さくすることができる。(Third Embodiment) FIG. 3 shows a third embodiment of the present invention.
Shown in Components substantially the same as those of the second embodiment are denoted by the same reference numerals. In the second embodiment, the pressure regulator 42
Is directly mounted on the housing 11 of the high-pressure fuel pump 2, but in the third embodiment, a pressure regulator 42 is mounted on a fuel pipe connected to the high-pressure fuel pump 3.
Thereby, the exclusive space around the high-pressure fuel pump 3 can be reduced.
【００２１】（第４実施例）本発明の第４実施例を図
４、図５および図６に示す。第１実施例と実質的に同一
構成部分には同一符号を付す。高圧燃料ポンプ４を駆動
するカム１００は４山である。図４に示すように、燃料
入口５０ａ、逆止弁４０、デリバリバルブ４１およびプ
レッシャレギュレータ４２は、図５および図６に示す仮
想直線１１０を含む高圧燃料ポンプ４の横断面上でハウ
ジング１１に形成または取り付けられている。さらに、
低圧側の燃料入口５０ａとプレッシャレギュレータ４
２、ならびに逆止弁４０の高圧側とデリバリバルブ４１
は互いに対向している。また、燃料入口５０ａと逆止弁
４０、ならびにデリバリバルブ４１とプレッシャレギュ
レータ４２はそれぞれ平行に形成または取り付けられて
いる。したがって、燃料配管を同一方向で取り付けるこ
とができるので、燃料配管の取付けが容易になる。さら
に、燃料入口５０ａおよび各弁の周囲のハウジング量が
減少するので、高圧燃料ポンプ４の体格を小型化でき
る。(Fourth Embodiment) FIGS. 4, 5 and 6 show a fourth embodiment of the present invention. Components substantially the same as those in the first embodiment are denoted by the same reference numerals. The number of cams 100 for driving the high-pressure fuel pump 4 is four. As shown in FIG. 4, the fuel inlet 50a, the check valve 40, the delivery valve 41 and the pressure regulator 42 are formed in the housing 11 on the cross section of the high-pressure fuel pump 4 including the imaginary straight line 110 shown in FIGS. Or is installed. further,
Low pressure side fuel inlet 50a and pressure regulator 4
2, and the high pressure side of the check valve 40 and the delivery valve 41
Are facing each other. Further, the fuel inlet 50a and the check valve 40, and the delivery valve 41 and the pressure regulator 42 are formed or attached in parallel, respectively. Therefore, the fuel pipes can be mounted in the same direction, so that the fuel pipes can be easily mounted. Furthermore, since the amount of housing around the fuel inlet 50a and each valve is reduced, the size of the high-pressure fuel pump 4 can be reduced.
【００２２】そして、燃料入口５０ａに接続する燃料配
管のハウジング１１への取付け座面、ならびに逆止弁４
０、デリバリバルブ４１およびプレッシャレギュレータ
４２のハウジング１１への取付け座面の仮想延長領域
は、プランジャ１３とシリンダ１２との摺動部よりも径
方向外側に位置している。したがって、燃料配管または
各弁をハウジング１１にねじ締めする際の軸力がプラン
ジャ１３とシリンダ１２との摺動部に加わらない。これ
により、シリンダ１２の摺動面の変形を防ぐことができ
るので、シリンダ１２とプランジャ１３との摺動クリア
ランスを所定量に保持できる。したがって、シリンダ１
２とプランジャ１３とが焼きつくことを防止できる。A seat for mounting a fuel pipe connected to the fuel inlet 50a to the housing 11, and a check valve 4
The virtual extension area of the seat for mounting the delivery valve 41 and the pressure regulator 42 to the housing 11 is located radially outside the sliding portion between the plunger 13 and the cylinder 12. Therefore, no axial force when screwing the fuel pipe or each valve to the housing 11 is applied to the sliding portion between the plunger 13 and the cylinder 12. Thereby, deformation of the sliding surface of the cylinder 12 can be prevented, so that the sliding clearance between the cylinder 12 and the plunger 13 can be maintained at a predetermined amount. Therefore, cylinder 1
2 and the plunger 13 can be prevented from burning.
【００２３】燃料吸入通路５２は、環状燃料室２５と逆
止弁４０とを接続しており、燃料吸入通路５３は逆止弁
４０とデリバリバルブ４１とを接続しており、燃料吸入
通路５４はデリバリバルブ４１と燃料加圧室１５とを接
続している。燃料吸入通路５２、５３および５４は第２
の吸入経路を構成している。燃料吸入通路５４は燃料吐
出通路を兼ねているので、燃料通路を形成する加工工数
が減少する。The fuel suction passage 52 connects the annular fuel chamber 25 and the check valve 40, the fuel suction passage 53 connects the check valve 40 and the delivery valve 41, and the fuel suction passage 54 The delivery valve 41 is connected to the fuel pressurizing chamber 15. The fuel suction passages 52, 53 and 54
Of the suction path. Since the fuel suction passage 54 also serves as a fuel discharge passage, the number of processing steps for forming the fuel passage is reduced.
【００２４】以上説明した本発明の実施の形態を示す上
記複数の実施例では、燃料加圧室１５に燃料を吸入する
経路を二経路設けたので、所定時間当たりの吐出量を増
加するためにプランジャ１３の往復速度を速めても、一
回の吸入行程当たりに必要な燃料量を吸入することがで
きる。さらに、燃料加圧室１５に直接連通する燃料吸入
通路に逆止弁４０を設けたことにより、プランジャ１３
が上死点に向かい上昇するときに電磁弁２０を閉弁すれ
ば燃料加圧室１５の燃圧により逆止弁４０が閉弁し燃料
加圧室１５が密封されるので、電磁弁２０の閉弁後速や
かに加圧圧送行程が開始される。これにより、吐出効率
を低下することなく所定時間当たり多量の燃料を吐出す
ることができる。In the above-described plurality of embodiments showing the embodiment of the present invention, since two routes for sucking fuel into the fuel pressurizing chamber 15 are provided, the discharge amount per predetermined time is increased. Even if the reciprocating speed of the plunger 13 is increased, it is possible to inhale a required amount of fuel per one intake stroke. Further, the check valve 40 is provided in the fuel suction passage that directly communicates with the fuel pressurizing chamber 15, so that the plunger 13
When the solenoid valve 20 is closed when the pressure rises toward the top dead center, the check valve 40 is closed by the fuel pressure of the fuel pressurizing chamber 15 and the fuel pressurizing chamber 15 is sealed. Immediately after the valve, the pressurizing and pressure feeding process is started. Thus, a large amount of fuel can be discharged per predetermined time without lowering the discharge efficiency.
【図１】本発明の第１実施例による高圧燃料ポンプを示
す縦断面図である。FIG. 1 is a longitudinal sectional view showing a high-pressure fuel pump according to a first embodiment of the present invention.
【図２】本発明の第２実施例による高圧燃料ポンプを示
す縦断面図である。FIG. 2 is a longitudinal sectional view showing a high-pressure fuel pump according to a second embodiment of the present invention.
【図３】本発明の第３実施例による高圧燃料ポンプを示
す縦断面図である。FIG. 3 is a longitudinal sectional view showing a high-pressure fuel pump according to a third embodiment of the present invention.
【図４】本発明の第４実施例による高圧燃料ポンプを示
す横断面図である。FIG. 4 is a cross-sectional view illustrating a high-pressure fuel pump according to a fourth embodiment of the present invention.
【図５】図４のＶ−Ｖ線断面図である。FIG. 5 is a sectional view taken along line VV of FIG. 4;
【図６】図４のVI−VI線断面図である。FIG. 6 is a sectional view taken along line VI-VI of FIG. 4;
【図７】従来例１による高圧燃料ポンプを示す縦断面図
である。FIG. 7 is a longitudinal sectional view showing a high-pressure fuel pump according to Conventional Example 1.
【図８】従来例２による高圧燃料ポンプを示す縦断面図
である。FIG. 8 is a longitudinal sectional view showing a high-pressure fuel pump according to Conventional Example 2.
１０ 高圧燃料ポンプ（燃料供給装置） １２ シリンダ（シリンダ部） １３ プランジャ １５ 燃料加圧室 ２０ 電磁弁（第１の吸入経路） ２１ 弁部材 ２４ 弁座 ２５ 環状燃料室（燃料導入室、第１の吸入経路） ３２ 燃料吸入通路（第２の吸入経路） ３３ 燃料吐出通路 ３４ 燃料排出通路 ４０ 逆止弁（第２の吸入経路） ５１ 燃料吸入通路（第２の吸入経路） ５２、５３、５４ 燃料吸入通路（第２の吸入経
路）DESCRIPTION OF SYMBOLS 10 High-pressure fuel pump (fuel supply apparatus) 12 Cylinder (cylinder part) 13 Plunger 15 Fuel pressurization room 20 Solenoid valve (First suction path) 21 Valve member 24 Valve seat 25 Annular fuel chamber (Fuel introduction chamber, First) (Suction path) 32 Fuel suction path (second suction path) 33 Fuel discharge path 34 Fuel discharge path 40 Check valve (second suction path) 51 Fuel suction path (second suction path) 52, 53, 54 Fuel Suction passage (second suction passage)
Claims (3)
給する燃料供給装置であって、 シリンダ部と、 前記シリンダ部に往復移動自在に支持され、燃料加圧室
に吸入した燃料を加圧するプランジャと、 前記燃料加圧室に低圧燃料を導入可能な燃料導入室と前
記燃料加圧室とを断続する電磁弁とを備え、 前記燃料加圧室と連通し通路中に逆止弁を設けた燃料吸
入通路を有し、燃料吸入行程において、前記燃料導入室
から前記電磁弁の開口部を経て前記燃料加圧室に低圧燃
料を吸入する第１の吸入経路と、前記逆止弁の開口部を
経て前記燃料吸入通路の低圧燃料を前記燃料加圧室に吸
入する第２の吸入経路とを有することを特徴とする燃料
供給装置。1. A fuel supply device for supplying high-pressure fuel to a fuel injection device of an internal combustion engine, wherein the fuel supply device is reciprocally supported by a cylinder portion and the cylinder portion, and pressurizes fuel sucked into a fuel pressurization chamber. A plunger, a fuel introduction chamber capable of introducing a low-pressure fuel into the fuel pressurization chamber, and an electromagnetic valve for intermittently connecting the fuel pressurization chamber, and a check valve provided in a passage communicating with the fuel pressurization chamber. A first suction path for sucking low-pressure fuel from the fuel introduction chamber through the opening of the solenoid valve into the fuel pressurizing chamber during a fuel suction stroke; and an opening of the check valve. A second suction passage for sucking the low-pressure fuel in the fuel suction passage into the fuel pressurizing chamber through a second portion.
けられており、前記燃料吸入通路は前記燃料導入室と連
通することを特徴とする請求項１記載の燃料供給装置。2. The fuel supply device according to claim 1, wherein the fuel introduction chamber is provided in contact with the electromagnetic valve, and the fuel suction passage communicates with the fuel introduction chamber.
記プランジャとの非摺動部に開口していることを特徴と
する請求項１または２記載の燃料供給装置。3. The fuel supply device according to claim 1, wherein the fuel suction passage is opened at a non-slidable portion of the cylinder portion with the plunger.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24082297A JP3879952B2 (en) | 1997-09-05 | 1997-09-05 | Fuel supply device |
| US09/146,196 US6123059A (en) | 1997-09-05 | 1998-09-03 | Fuel supply apparatus |
| EP04009230A EP1452728B1 (en) | 1997-09-05 | 1998-09-04 | Fuel supply apparatus |
| EP98116770A EP0900934B1 (en) | 1997-09-05 | 1998-09-04 | Fuel supply apparatus |
| DE69832833T DE69832833T2 (en) | 1997-09-05 | 1998-09-04 | Fuel supply means |
| DE69827564T DE69827564T2 (en) | 1997-09-05 | 1998-09-04 | Fuel supply means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24082297A JP3879952B2 (en) | 1997-09-05 | 1997-09-05 | Fuel supply device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1182237A true JPH1182237A (en) | 1999-03-26 |
| JP3879952B2 JP3879952B2 (en) | 2007-02-14 |
Family
ID=17065221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24082297A Expired - Fee Related JP3879952B2 (en) | 1997-09-05 | 1997-09-05 | Fuel supply device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3879952B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007332795A (en) * | 2006-06-12 | 2007-12-27 | Toyota Motor Corp | Fuel pump and fuel supply system |
| WO2009044812A1 (en) * | 2007-10-05 | 2009-04-09 | Yanmar Co., Ltd. | Supply pump |
| JP2010065638A (en) * | 2008-09-12 | 2010-03-25 | Bosch Corp | Accumulator fuel supply system for liquefied gas fuel, and high-pressure pump for liquefied gas fuel |
| JP2010196687A (en) * | 2009-02-27 | 2010-09-09 | Denso Corp | High-pressure pump |
| JP2010265759A (en) * | 2009-05-12 | 2010-11-25 | Denso Corp | Fuel pressure feeding system |
| JP2013185596A (en) * | 2012-03-08 | 2013-09-19 | Man Diesel & Turbo Se | Block fluid guide portion, and common rail fuel system |
| JP2015172373A (en) * | 1999-02-09 | 2015-10-01 | 日立オートモティブシステムズ株式会社 | Control device of internal combustion engine high-pressure fuel supply pump |
| USD865514S1 (en) | 2015-11-17 | 2019-11-05 | Hunter Fan Company | Carton with color striping |
-
1997
- 1997-09-05 JP JP24082297A patent/JP3879952B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015172373A (en) * | 1999-02-09 | 2015-10-01 | 日立オートモティブシステムズ株式会社 | Control device of internal combustion engine high-pressure fuel supply pump |
| JP2007332795A (en) * | 2006-06-12 | 2007-12-27 | Toyota Motor Corp | Fuel pump and fuel supply system |
| WO2009044812A1 (en) * | 2007-10-05 | 2009-04-09 | Yanmar Co., Ltd. | Supply pump |
| JP2009091956A (en) * | 2007-10-05 | 2009-04-30 | Yanmar Co Ltd | Supply pump |
| JP2010065638A (en) * | 2008-09-12 | 2010-03-25 | Bosch Corp | Accumulator fuel supply system for liquefied gas fuel, and high-pressure pump for liquefied gas fuel |
| JP2010196687A (en) * | 2009-02-27 | 2010-09-09 | Denso Corp | High-pressure pump |
| JP2010265759A (en) * | 2009-05-12 | 2010-11-25 | Denso Corp | Fuel pressure feeding system |
| DE102010016900B4 (en) | 2009-05-12 | 2018-12-13 | Denso Corporation | A fuel supply device and method of operating a fuel supply device |
| JP2013185596A (en) * | 2012-03-08 | 2013-09-19 | Man Diesel & Turbo Se | Block fluid guide portion, and common rail fuel system |
| KR20130103387A (en) * | 2012-03-08 | 2013-09-23 | 만 디젤 앤 터보 에스이 | Block-shaped fluid line part and common-rail fuel system |
| USD865514S1 (en) | 2015-11-17 | 2019-11-05 | Hunter Fan Company | Carton with color striping |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3879952B2 (en) | 2007-02-14 |
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