JP2012163154A - Solenoid valve and fuel feeding pump - Google Patents

Solenoid valve and fuel feeding pump Download PDF

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JP2012163154A
JP2012163154A JP2011023703A JP2011023703A JP2012163154A JP 2012163154 A JP2012163154 A JP 2012163154A JP 2011023703 A JP2011023703 A JP 2011023703A JP 2011023703 A JP2011023703 A JP 2011023703A JP 2012163154 A JP2012163154 A JP 2012163154A
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spring
fuel
valve
stator
valve body
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JP5691583B2 (en
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Yoshifumi Iwata
吉史 岩田
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Denso Corp
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Denso Corp
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Abstract

PROBLEM TO BE SOLVED: To lower contact sound when a movable element comes into contact with a fixed element without lowering responsibility of a valve body in a solenoid valve of a fuel feeding pump.SOLUTION: The solenoid valve includes the first spring 17 biasing the movable element in a direction opposite to the attracting direction by the fixed element, the first spring 17 has a nonlinear characteristic, the nonlinear characteristics of the first spring 17 has large and small two values A, B in spring constants, the spring constant is switched from the small value A to the large value B when a compressed quantity exceeds the predetermined threshold value C. The threshold value C is set as the compressed quantity when the valve body sits on the seat surface and stops the movement. Consequently, the acceleration of the movable body is not alleviated much by the first spring 17 till the valve body sits on the seat surface and the acceleration is greatly alleviated by the first spring 17 after the valve body sits on the seat surface. Thereby, the contact sound when the movable body comes in contact with the fixed body can be lowered without lowering the responsibility of the valve body.

Description

本発明は、電磁弁、および電磁弁を用いた燃料供給ポンプに関する。   The present invention relates to a solenoid valve and a fuel supply pump using the solenoid valve.

従来から、内燃機関（図示せず）に燃料を供給する燃料供給ポンプ１００では、図３に示すように、軸方向に往復動するプランジャ１０１と、プランジャ１０１を軸方向に摺動自在に支持して収容するシリンダ孔１０２を有するシリンダボディ１０３と、プランジャ１０１を駆動するカム１０４とを備え、シリンダ孔１０２の軸方向一端をプランジャ１０１により液密的に区画することで燃料の加圧室１０５を形成するものが公知である（例えば、特許文献１参照）。   2. Description of the Related Art Conventionally, in a fuel supply pump 100 that supplies fuel to an internal combustion engine (not shown), as shown in FIG. 3, a plunger 101 that reciprocates in the axial direction and a plunger 101 are slidably supported in the axial direction. A cylinder body 103 having a cylinder hole 102 to be received and a cam 104 for driving the plunger 101, and a fuel pressurizing chamber 105 is formed by liquid-tightly partitioning one end of the cylinder hole 102 in the axial direction by the plunger 101. What is formed is known (see, for example, Patent Document 1).

また、燃料供給ポンプ１００は、加圧室１０５への燃料の吸入路１０７に対して加圧室１０５を開閉する電磁弁１０８を備える。
さらに、加圧室１０５からの燃料の流出口には、加圧室１０５からの燃料の吐出路１０９に対して加圧室１０５を開閉する逆止弁１１０が配置され、逆止弁１１０は、加圧室１０５の燃料圧が所定の開弁圧を超えると開弁する。 The fuel supply pump 100 also includes an electromagnetic valve 108 that opens and closes the pressurization chamber 105 with respect to the fuel suction path 107 to the pressurization chamber 105.
Further, a check valve 110 that opens and closes the pressurization chamber 105 with respect to the fuel discharge path 109 from the pressurization chamber 105 is disposed at the outlet of the fuel from the pressurization chamber 105. When the fuel pressure in the pressurizing chamber 105 exceeds a predetermined valve opening pressure, the valve opens.

このような構成により、燃料供給ポンプ１００は、プランジャ１０１をシリンダ孔１０２で軸方向に摺動自在に支持するとともに往復動させて加圧室１０５の容積を可変する。そして、燃料供給ポンプ１００は、加圧室１０５の容積を縮小して加圧室１０５の燃料を圧縮しているときに、電磁弁１０８により加圧室１０５を吸入路１０７に対して閉鎖することで、加圧室１０５の燃料を圧縮して加圧室１０５の燃料圧を増圧するとともに逆止弁１１０を開弁させ、圧縮した燃料を加圧室１０５から吐出する。   With such a configuration, the fuel supply pump 100 changes the volume of the pressurizing chamber 105 by supporting the plunger 101 slidably in the axial direction through the cylinder hole 102 and reciprocating it. The fuel supply pump 100 closes the pressurization chamber 105 with respect to the suction passage 107 by the electromagnetic valve 108 when the volume of the pressurization chamber 105 is reduced to compress the fuel in the pressurization chamber 105. Thus, the fuel in the pressurizing chamber 105 is compressed to increase the fuel pressure in the pressurizing chamber 105 and the check valve 110 is opened, and the compressed fuel is discharged from the pressurizing chamber 105.

ところで、燃料供給ポンプ１００によれば、電磁弁１０８は、例えば、ソレノイドコイル１１２への通電により励磁されて吸引力を及ぼしあう可動子１１３および固定子１１４、可動子１１３を固定子１１４による吸引方向とは反対の方向に付勢するバネ１１５、可動子１１３の移動に応じて加圧室１０５を吸入路１０７に対して開閉する弁体１１６を備える。   By the way, according to the fuel supply pump 100, the solenoid valve 108 is excited by energizing the solenoid coil 112, for example, the movable element 113 and the stationary element 114, and the movable element 113 are attracted by the stationary element 114. And a valve body 116 that opens and closes the pressurizing chamber 105 with respect to the suction passage 107 in accordance with the movement of the movable element 113.

これにより、電磁弁１０８は、ソレノイドコイル１１２への通電開始によって、固定子１１４の方に可動子１１３を吸引して移動させ、加圧室１０５を吸入路１０７に対して閉鎖する方向に弁体１１６を駆動するとともにバネ１１５を圧縮し、さらに可動子１１３を固定子１１４に当接するまで移動させる。
このため、可動子１１３は、移動開始後、吸引力により一貫して加速され続けて固定子１１４に当接するので、可動子１１３が固定子１１４に当接するときの当接音は必然的に大きくなってしまう。 Accordingly, the solenoid valve 108 sucks and moves the movable element 113 toward the stator 114 when the energization of the solenoid coil 112 is started, and the valve body in a direction to close the pressurizing chamber 105 with respect to the suction passage 107. 116 is driven, the spring 115 is compressed, and the mover 113 is moved until it contacts the stator 114.
For this reason, since the movable element 113 is continuously accelerated by the suction force after starting to move and comes into contact with the stator 114, the contact sound when the movable element 113 comes into contact with the stator 114 is inevitably loud. turn into.

そこで、当接音を下げるため、バネ１１５のバネ定数を大きくして吸引力による加速を緩和する方法が考えられるが、可動子１１３の加速を緩和することによって弁体１１６の移動速度が低下してしまい、弁体１１６の閉弁応答性が低下してしまう。   In order to reduce the contact noise, a method of increasing the spring constant of the spring 115 to mitigate acceleration due to the suction force can be considered. However, by mitigating the acceleration of the mover 113, the moving speed of the valve element 116 decreases. As a result, the valve closing response of the valve body 116 is lowered.

米国特許第６８８６５３６号明細書US Pat. No. 6,886,536

本発明は、上記の問題点を解決するためになされたものであり、その目的は、電磁弁において、弁体の応答性を下げることなく、可動子が固定子に当接するときの当接音を下げることにある。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a contact sound generated when the mover contacts the stator without lowering the responsiveness of the valve body in the electromagnetic valve. Is to lower.

〔請求項１の手段〕
請求項１の手段によれば、電磁弁は、ソレノイドコイルへの通電により励磁されて吸引力を及ぼしあう可動子および固定子、可動子を固定子による吸引方向とは反対の方向に付勢するバネ、ならびに、可動子の移動に応じて開弁動作または閉弁動作をする弁体とを備え、ソレノイドコイルへの通電により固定子の方に可動子を吸引することで、弁体を駆動するとともにバネを弾性変形させ、さらに可動子を固定子に当接するまで移動させる。そして、バネは、ソレノイドコイルへの通電時の変形量が大きいほどバネ定数が大きくなる非線形特性を有する。 [Means of Claim 1]
According to the first aspect of the present invention, the electromagnetic valve is energized by energizing the solenoid coil to urge the movable element and the stator which exert an attractive force, and the movable element in a direction opposite to the attractive direction by the stationary element. A spring and a valve element that opens or closes according to the movement of the mover, and drives the valve element by attracting the mover toward the stator by energizing the solenoid coil. At the same time, the spring is elastically deformed, and the movable element is moved until it abuts against the stator. The spring has a non-linear characteristic in which the spring constant increases as the amount of deformation during energization of the solenoid coil increases.

これにより、吸引力による可動子の加速度は、可動子の移動開始後、バネの変形量が大きくなるほど小さくなる。したがって、可動子が移動を開始してから固定子に当接するまでの間に弁体が所定の応答位置に達する場合を考え、可動子が移動を開始してから弁体が所定の応答位置に達するまでの第１期間と、弁体が所定の応答位置に達してから可動子が固定子に当接するまでの第２期間とで可動子の加速を比較すると、第２期間の方が第１期間よりも可動子の加速が緩和される。このため、電磁弁において、弁体の応答性を下げることなく、可動子が固定子に当接するときの当接音を下げることができる。   As a result, the acceleration of the mover due to the suction force decreases as the amount of deformation of the spring increases after the mover starts moving. Therefore, considering the case where the valve element reaches a predetermined response position after the mover starts moving and contacts the stator, the valve element moves to the predetermined response position after the mover starts moving. When the acceleration of the mover is compared between the first period until reaching the predetermined response position and the second period until the mover contacts the stator, the second period is the first period. The acceleration of the mover is less than the period. For this reason, in the electromagnetic valve, it is possible to reduce the contact sound when the mover contacts the stator without reducing the responsiveness of the valve body.

〔請求項２の手段〕
請求項２の手段によれば、可動子は、弁体が所定の応答位置に到達して移動を停止した後も移動し続けて固定子に当接する。また、バネの非線形特性はバネ定数に関して大小２つの数値を有し、バネ定数は、変形量が所定の閾値を超えたときに小さい数値から大きい数値に切り替わる。そして、所定の閾値は、弁体が所定の応答位置に到達して移動を停止したときの変形量と、可動子が固定子に当接したときの変形量との間に設定されている。 [Means of claim 2]
According to the second aspect of the present invention, the movable element continues to move even after the valve body reaches the predetermined response position and stops moving, and comes into contact with the stator. Further, the non-linear characteristic of the spring has two numerical values with respect to the spring constant, and the spring constant is switched from a small numerical value to a large numerical value when the deformation amount exceeds a predetermined threshold value. The predetermined threshold value is set between a deformation amount when the valve body reaches a predetermined response position and stops moving, and a deformation amount when the movable element contacts the stator.

これにより、可動子は、弁体が所定の応答位置に到達するまで、吸引力による加速がバネの付勢力によってさほど緩和されず、弁体が所定の応答位置に到達した後に、吸引力による加速がバネの付勢力によって大きく緩和される。このため、より確実に、弁体の応答性を下げることなく、可動子が固定子に当接するときの当接音を下げることができる。   As a result, the acceleration by the suction force is not alleviated by the biasing force of the spring until the valve body reaches the predetermined response position, and the acceleration by the suction force is performed after the valve body reaches the predetermined response position. Is greatly relaxed by the biasing force of the spring. For this reason, it is possible to lower the contact sound when the mover contacts the stator without lowering the responsiveness of the valve body.

〔請求項３の手段〕
請求項３の手段によれば、バネは大小２つのピッチを有するコイルスプリングであり、コイルスプリングは、両端のピッチが小さく、かつ両端の間の中央のピッチが大きい。
これにより、弁体の応答性を下げることなく当接音を緩和することができるバネを、容易に製造することができる。 [Means of claim 3]
According to the means of claim 3, the spring is a coil spring having two large and small pitches, and the coil spring has a small pitch at both ends and a large central pitch between both ends.
Thereby, the spring which can relieve a contact sound, without reducing the responsiveness of a valve body can be manufactured easily.

〔請求項４の手段〕
請求項４の手段によれば、燃料供給ポンプは、請求項１〜請求項３の内のいずれか１つに記載の電磁弁を備え、内燃機関に燃料を供給する。
また、燃料供給ポンプは、軸方向に往復動するプランジャと、プランジャを軸方向に摺動自在に支持して収容するシリンダ孔を有するシリンダボディと、プランジャを駆動するカムとを備え、シリンダ孔の軸方向一端をプランジャにより液密的に区画することで燃料の加圧室を形成する。 [Means of claim 4]
According to the means of claim 4, the fuel supply pump includes the electromagnetic valve according to any one of claims 1 to 3, and supplies fuel to the internal combustion engine.
The fuel supply pump includes a plunger that reciprocates in the axial direction, a cylinder body that has a cylinder hole that slidably supports and accommodates the plunger in the axial direction, and a cam that drives the plunger. A fuel pressurizing chamber is formed by liquid-tightly dividing one end in the axial direction by a plunger.

また、電磁弁は、加圧室への燃料の吸入路に対して加圧室を開閉するように組み込まれ、加圧室からの燃料の吐出路には、吐出路に対して加圧室を開閉する逆止弁が配置され、逆止弁は、加圧室の燃料圧が所定の開弁圧を超えると開弁するように設けられている。   The solenoid valve is incorporated so as to open and close the pressurization chamber with respect to the fuel suction path to the pressurization chamber, and the fuel discharge path from the pressurization chamber has a pressurization chamber with respect to the discharge path. A check valve that opens and closes is arranged, and the check valve is provided to open when the fuel pressure in the pressurizing chamber exceeds a predetermined valve opening pressure.

そして、燃料供給ポンプは、プランジャをシリンダ孔で軸方向に摺動自在に支持するとともに往復動させて加圧室の容積を可変し、加圧室の容積を縮小して加圧室の燃料を圧縮しているときに、電磁弁により加圧室を吸入路に対して閉鎖することで、加圧室の燃料圧を増圧するとともに逆止弁を開弁させ、圧縮した燃料を加圧室から吐出する。
この手段は、弁体の応答性を下げることなく当接音を緩和することができる電磁弁を、燃料供給ポンプに適用する一態様を示すものである。 The fuel supply pump supports the plunger slidably in the axial direction in the cylinder hole and reciprocates to change the volume of the pressurizing chamber, and reduces the volume of the pressurizing chamber to reduce the fuel in the pressurizing chamber. During compression, the pressurization chamber is closed with respect to the suction passage by the electromagnetic valve, thereby increasing the fuel pressure in the pressurization chamber and opening the check valve so that the compressed fuel is removed from the pressurization chamber. Discharge.
This means shows one aspect in which an electromagnetic valve that can alleviate the contact noise without lowering the responsiveness of the valve body is applied to the fuel supply pump.

燃料供給ポンプの全体構成図である（実施例）。It is a whole block diagram of a fuel supply pump (Example). （ａ）は第１バネの説明図であり、（ｂ）は第１バネの非線形特性を示す特性図である（実施例）。(A) is explanatory drawing of a 1st spring, (b) is a characteristic view which shows the nonlinear characteristic of a 1st spring (Example). 燃料供給ポンプの全体構成図である（従来例）。It is a whole block diagram of a fuel supply pump (conventional example).

実施形態の電磁弁は、ソレノイドコイルへの通電により励磁されて吸引力を及ぼしあう可動子および固定子、可動子を固定子による吸引方向とは反対の方向に付勢するバネ、ならびに、可動子の移動に応じて開弁動作または閉弁動作をする弁体とを備え、ソレノイドコイルへの通電により固定子の方に可動子を吸引することで、弁体を駆動するとともにバネを弾性変形させ、さらに可動子を固定子に当接するまで移動させる。そして、バネは、ソレノイドコイルへの通電時の変形量が大きいほどバネ定数が大きくなる非線形特性を有する。   The solenoid valve according to the embodiment includes a mover and a stator that are excited by energization of a solenoid coil to exert an attractive force, a spring that biases the mover in a direction opposite to a suction direction by the stator, and a mover A valve body that opens or closes according to the movement of the valve, and by attracting the mover toward the stator by energizing the solenoid coil, the valve body is driven and the spring is elastically deformed. Further, the mover is moved until it comes into contact with the stator. The spring has a non-linear characteristic in which the spring constant increases as the amount of deformation during energization of the solenoid coil increases.

また、可動子は、弁体が所定の応答位置に到達して移動を停止した後も移動し続けて固定子に当接する。また、バネの非線形特性はバネ定数に関して大小２つの数値を有し、バネ定数は、変形量が所定の閾値を超えたときに小さい数値から大きい数値に切り替わる。そして、所定の閾値は、弁体が所定の応答位置に到達して移動を停止したときの変形量と、可動子が固定子に当接したときの変形量との間に設定されている。
さらに、バネは大小２つのピッチを有するコイルスプリングであり、コイルスプリングは、両端のピッチが小さく、かつ両端の間の中央のピッチが大きい。 The mover continues to move even after the valve body reaches a predetermined response position and stops moving, and comes into contact with the stator. Further, the non-linear characteristic of the spring has two numerical values with respect to the spring constant, and the spring constant is switched from a small numerical value to a large numerical value when the deformation amount exceeds a predetermined threshold value. The predetermined threshold value is set between a deformation amount when the valve body reaches a predetermined response position and stops moving, and a deformation amount when the movable element contacts the stator.
Furthermore, the spring is a coil spring having two large and small pitches, and the coil spring has a small pitch at both ends and a large central pitch between the both ends.

また、実施形態の燃料供給ポンプは電磁弁を備え、内燃機関に燃料を供給する。
また、燃料供給ポンプは、軸方向に往復動するプランジャと、プランジャを軸方向に摺動自在に支持して収容するシリンダ孔を有するシリンダボディと、プランジャを駆動するカムとを備え、シリンダ孔の軸方向一端をプランジャにより液密的に区画することで燃料の加圧室を形成する。 In addition, the fuel supply pump of the embodiment includes an electromagnetic valve and supplies fuel to the internal combustion engine.
The fuel supply pump includes a plunger that reciprocates in the axial direction, a cylinder body that has a cylinder hole that slidably supports and accommodates the plunger in the axial direction, and a cam that drives the plunger. A fuel pressurizing chamber is formed by liquid-tightly dividing one end in the axial direction by a plunger.

また、電磁弁は、加圧室への燃料の吸入路に対して加圧室を開閉するように組み込まれ、加圧室からの燃料の吐出路には、吐出路に対して加圧室を開閉する逆止弁が配置され、逆止弁は、加圧室の燃料圧が所定の開弁圧を超えると開弁するように設けられている。
そして、燃料供給ポンプは、プランジャをシリンダ孔で軸方向に摺動自在に支持するとともに往復動させて加圧室の容積を可変し、加圧室の容積を縮小して加圧室の燃料を圧縮しているときに、電磁弁により加圧室を吸入路に対して閉鎖することで、加圧室の燃料圧を増圧するとともに逆止弁を開弁させ、圧縮した燃料を加圧室から吐出する。 The solenoid valve is incorporated so as to open and close the pressurization chamber with respect to the fuel suction path to the pressurization chamber, and the fuel discharge path from the pressurization chamber has a pressurization chamber with respect to the discharge path. A check valve that opens and closes is arranged, and the check valve is provided to open when the fuel pressure in the pressurizing chamber exceeds a predetermined valve opening pressure.
The fuel supply pump supports the plunger slidably in the axial direction in the cylinder hole and reciprocates to change the volume of the pressurizing chamber, and reduces the volume of the pressurizing chamber to reduce the fuel in the pressurizing chamber. During compression, the pressurization chamber is closed with respect to the suction passage by the electromagnetic valve, thereby increasing the fuel pressure in the pressurization chamber and opening the check valve so that the compressed fuel is removed from the pressurization chamber. Discharge.

〔実施例の構成〕
実施例の燃料供給ポンプ１の構成を、図１を用いて説明する。
燃料供給ポンプ１は、例えば、車両の内燃機関（図示せず）に噴射供給すべき燃料を加圧して吐出するものである。そして、燃料供給ポンプ１は、例えば、蓄圧容器としてのコモンレールで高圧状態に蓄圧された燃料を内燃機関に噴射供給する蓄圧式の燃料噴射装置の一部を構成し、燃料タンクから汲み上げた燃料を加圧して吐出することでコモンレールに供給する。なお、燃料噴射装置は、各機器の動作を制御する電子制御ユニット（以下、ＥＣＵ２と呼ぶ）を備えており、燃料供給ポンプ１の動作もＥＣＵ２により制御される。 [Configuration of Example]
The configuration of the fuel supply pump 1 according to the embodiment will be described with reference to FIG.
The fuel supply pump 1 pressurizes and discharges fuel to be injected and supplied to an internal combustion engine (not shown) of a vehicle, for example. The fuel supply pump 1 constitutes a part of an accumulator fuel injection device that injects fuel accumulated in a high-pressure state with a common rail as an accumulator vessel into an internal combustion engine, for example, and supplies the fuel pumped up from the fuel tank. Supply to the common rail by pressurizing and discharging. The fuel injection device includes an electronic control unit (hereinafter referred to as ECU 2) that controls the operation of each device, and the operation of the fuel supply pump 1 is also controlled by the ECU 2.

燃料供給ポンプ１は、軸方向に往復動するプランジャ３と、プランジャ３を軸方向に摺動自在に支持して収容するシリンダ孔４を有するシリンダボディ５と、プランジャ３を駆動するカム６とを備え、シリンダ孔４の軸方向一端をプランジャ３により液密的に区画することで燃料の加圧室７を形成している。   The fuel supply pump 1 includes a plunger 3 that reciprocates in an axial direction, a cylinder body 5 that has a cylinder hole 4 that supports and accommodates the plunger 3 slidably in the axial direction, and a cam 6 that drives the plunger 3. The fuel pressurizing chamber 7 is formed by liquid-tightly partitioning one end of the cylinder hole 4 in the axial direction with the plunger 3.

また、燃料供給ポンプ１は、加圧室７への燃料の吸入路９に対して加圧室７を開閉する電磁弁１０を備え、加圧室７からの燃料の流出口には、加圧室７からの燃料の吐出路１１に対して加圧室７を開閉する逆止弁１２が配置され、逆止弁１２は、加圧室７の燃料圧が所定の開弁圧を超えると開弁するように設けられている。   The fuel supply pump 1 also includes an electromagnetic valve 10 that opens and closes the pressurization chamber 7 with respect to the fuel suction path 9 to the pressurization chamber 7. A check valve 12 that opens and closes the pressurizing chamber 7 is disposed with respect to the fuel discharge path 11 from the chamber 7, and the check valve 12 opens when the fuel pressure in the pressurizing chamber 7 exceeds a predetermined valve opening pressure. It is provided to counter.

以上のような構成により、燃料供給ポンプ１は、プランジャ３をシリンダ孔４で軸方向に摺動自在に支持するとともに往復動させて加圧室７の容積を可変する。
そして、燃料供給ポンプ１は、加圧室７の容積を縮小して加圧室７の燃料を圧縮しているときに、電磁弁１０により加圧室７を吸入路９に対して閉鎖することで、加圧室７の燃料を圧縮して加圧室７の燃料圧を増圧するとともに逆止弁１２を開弁させ、圧縮した燃料を加圧室７から吐出する。また、燃料供給ポンプ１は、加圧室７の容積を拡大しているときに、加圧室７を吸入路９に対して開放しておき、加圧室７に燃料を吸入する。 With the configuration described above, the fuel supply pump 1 supports the plunger 3 slidably in the axial direction through the cylinder hole 4 and reciprocates to vary the volume of the pressurizing chamber 7.
The fuel supply pump 1 closes the pressurizing chamber 7 with respect to the suction passage 9 by the electromagnetic valve 10 when the volume of the pressurizing chamber 7 is reduced and the fuel in the pressurizing chamber 7 is compressed. Thus, the fuel in the pressurizing chamber 7 is compressed to increase the fuel pressure in the pressurizing chamber 7 and the check valve 12 is opened, and the compressed fuel is discharged from the pressurizing chamber 7. The fuel supply pump 1 opens the pressurizing chamber 7 with respect to the suction passage 9 when the volume of the pressurizing chamber 7 is enlarged, and sucks fuel into the pressurizing chamber 7.

また、電磁弁１０は、ソレノイドコイル１４への通電により励磁されて吸引力を及ぼしあう可動子１５および固定子１６、可動子１５を固定子１６による吸引方向とは反対の方向に付勢する第１バネ１７、可動子１５の移動に応じて加圧室７を吸入路９に対して開閉する弁体１８、ならびに、加圧室７を吸入路９に対して閉鎖する方向に弁体１８を付勢する第２バネ１９を備える。   The solenoid valve 10 is energized by energization of the solenoid coil 14 and biases the mover 15 and the stator 16 and the mover 15 that exert an attractive force in a direction opposite to the direction of attraction by the stator 16. 1 spring 17, a valve body 18 that opens and closes the pressurizing chamber 7 with respect to the suction path 9 according to the movement of the mover 15, and a valve body 18 in a direction to close the pressurization chamber 7 with respect to the suction path 9. A second spring 19 for biasing is provided.

ここで、吸入路９の内、シリンダボディ５に設けられる部分には、弁体１８が離着する座面２０が形成されており、弁体１８は、座面２０に着座することで加圧室７を吸入路９に対して閉鎖し、座面２０から離座することで加圧室７を吸入路９に対して開放する。
また、弁体１８は、ロッド２１と一体に設けられており、ロッド２１は、可動子１５に当接し、可動子１５、弁体１８およびロッド２１は一体となって移動することができる。 Here, a seat surface 20 on which the valve body 18 is detached is formed in a portion provided in the cylinder body 5 in the suction passage 9, and the valve body 18 is pressurized by being seated on the seat surface 20. The chamber 7 is closed with respect to the suction path 9, and the pressurizing chamber 7 is opened with respect to the suction path 9 by being separated from the seating surface 20.
Further, the valve body 18 is provided integrally with the rod 21, the rod 21 abuts on the movable element 15, and the movable element 15, the valve body 18 and the rod 21 can move together.

また、可動子１５、固定子１６、弁体１８、および第１、第２バネ１７、１９は、電磁弁１０において同軸をなすように組み込まれており、可動子１５および固定子１６に作用する吸引力の方向、第１、第２バネ１７、１９の伸縮方向は、プランジャ３やシリンダ孔４の軸方向に一致している。   The mover 15, the stator 16, the valve body 18, and the first and second springs 17 and 19 are incorporated so as to be coaxial with each other in the electromagnetic valve 10, and act on the mover 15 and the stator 16. The direction of the suction force and the expansion / contraction direction of the first and second springs 17 and 19 coincide with the axial direction of the plunger 3 and the cylinder hole 4.

さらに、第１、第２バネ１７、１９は、ソレノイドコイル１４への通電が停止されている状態で、弁体１８が座面２０から離座するようにセットされている。
なお、ＥＣＵ２は、ソレノイドコイル１４への通電の開始および停止を指令することで電磁弁１０の弁体１８を駆動させ、燃料供給ポンプ１の動作を制御する。 Further, the first and second springs 17 and 19 are set so that the valve element 18 is separated from the seating surface 20 in a state where the energization to the solenoid coil 14 is stopped.
The ECU 2 controls the operation of the fuel supply pump 1 by driving the valve element 18 of the electromagnetic valve 10 by instructing the start and stop of energization of the solenoid coil 14.

以上のような構成により、電磁弁１０は、ソレノイドコイル１４への通電開始により固定子１６の方に可動子１５を吸引することで、弁体１８を座面２０に向けて駆動するとともに可動子１５により第１バネ１７を圧縮し、さらに可動子１５を固定子１６に当接するまで移動させる。これにより、弁体１８は、座面２０に着座して加圧室７を吸入路９に対して閉鎖する。また、可動子１５は、弁体１８が座面２０に着座した後、ロッド２１との当接を解除して固定子１６の方に移動し続けて固定子１６に当接する。   With the configuration described above, the solenoid valve 10 attracts the mover 15 toward the stator 16 when the energization of the solenoid coil 14 is started, thereby driving the valve body 18 toward the seat surface 20 and moving the mover 15. The first spring 17 is compressed by 15 and the movable element 15 is moved until it contacts the stator 16. As a result, the valve body 18 is seated on the seat surface 20 and closes the pressurizing chamber 7 with respect to the suction path 9. Further, after the valve element 18 is seated on the seating surface 20, the movable element 15 is released from the contact with the rod 21 and continues to move toward the stator 16, thereby contacting the stator 16.

そして、電磁弁１０は、ソレノイドコイル１４への通電停止により、第１バネ１７の付勢力によって可動子１５を固定子１６から引き離すとともに可動子１５をロッド２１に当接させ、さらに、可動子１５と弁体１８とを一体として移動させる。これにより、弁体１８は、第２バネ１９を圧縮するとともに座面２０から離座して加圧室７を吸入路９に対して開放する。   Then, when the energization of the solenoid coil 14 is stopped, the solenoid valve 10 causes the mover 15 to be separated from the stator 16 by the urging force of the first spring 17, and the mover 15 is brought into contact with the rod 21. And the valve body 18 are moved together. Accordingly, the valve body 18 compresses the second spring 19 and is separated from the seat surface 20 to open the pressurizing chamber 7 to the suction path 9.

〔実施例の特徴〕
実施例の燃料供給ポンプ１の特徴を、図１および図２を用いて説明する。
まず、第１バネ１７は、大小２つのピッチを有するコイルスプリングであり、両端のピッチが小さく、かつ両端の間の中央のピッチが大きい不等ピッチバネである（以下、第１バネ１７において、両端のピッチが小さい部分を小ピッチ部２３と呼び、中央のピッチが大きい部分を大ピッチ部２４と呼ぶ。）。これにより、第１バネ１７では、圧縮量が小さいときに主に小ピッチ部２３が圧縮され、圧縮量が大きいときに主に大ピッチ部２４が圧縮される。 [Features of Examples]
Features of the fuel supply pump 1 according to the embodiment will be described with reference to FIGS. 1 and 2.
First, the first spring 17 is a coil spring having two large and small pitches, and is an unequal pitch spring having a small pitch at both ends and a large central pitch between both ends (hereinafter, both ends of the first spring 17 are both ends). A portion having a small pitch is called a small pitch portion 23, and a portion having a large central pitch is called a large pitch portion 24). Thereby, in the 1st spring 17, when the compression amount is small, the small pitch part 23 is mainly compressed, and when the compression amount is large, the large pitch part 24 is mainly compressed.

このため、第１バネ１７は、圧縮量が大きいほどバネ定数が大きくなる非線形特性を有する（図２（ｂ）参照）。より具体的に、第１バネ１７の非線形特性は、バネ定数に関して大小２つの数値Ａ、Ｂを有し、バネ定数は、圧縮量が所定の閾値Ｃを超えたときに小さい数値Ａから大きい数値Ｂに切り替わる。   For this reason, the first spring 17 has a nonlinear characteristic that the spring constant increases as the amount of compression increases (see FIG. 2B). More specifically, the non-linear characteristic of the first spring 17 has two numerical values A and B with respect to the spring constant, and the spring constant increases from a small numerical value A to a large numerical value when the compression amount exceeds a predetermined threshold C. Switch to B.

そして、閾値Ｃは、ソレノイドコイル１４への通電開始により弁体１８が座面２０に到達して移動を停止したときの圧縮量として設定されている。すなわち、第１バネ１７は、可動子１５が移動を開始してから弁体１８が座面２０に着座するまでの第１期間において、バネ定数を数値Ａとして圧縮されていき、弁体１８が座面２０に着座してから可動子１５が固定子１６に当接するまでの第２期間において、バネ定数を数値Ｂとして圧縮されていく。
したがって、第１、第２期間で可動子１５の加速を比較すると、第２期間の方が第１期間よりも加速が緩和される。 The threshold C is set as a compression amount when the valve element 18 reaches the seat surface 20 and stops moving due to the start of energization of the solenoid coil 14. That is, the first spring 17 is compressed with the spring constant as the numerical value A in the first period from when the mover 15 starts to move until the valve body 18 is seated on the seat surface 20, and the valve body 18 is During the second period from when the movable element 15 contacts the stator 16 after sitting on the seating surface 20, the spring constant is compressed as a numerical value B.
Therefore, when the acceleration of the mover 15 is compared in the first and second periods, the acceleration in the second period is less than in the first period.

〔実施例の効果〕
実施例の燃料供給ポンプ１によれば、電磁弁１０は、可動子１５を固定子１６による吸引方向とは反対の方向に付勢する第１バネ１７を備え、ソレノイドコイル１４への通電により固定子１６の方に可動子１５を吸引することで、弁体１８を駆動するとともに第１バネ１７を圧縮し、可動子１５は、弁体１８が座面２０に着座した後も移動し続けて固定子１６に当接する。そして、第１バネ１７は、圧縮量が大きいほどバネ定数が大きくなる非線形特性を有する。 [Effects of Examples]
According to the fuel supply pump 1 of the embodiment, the solenoid valve 10 includes the first spring 17 that urges the mover 15 in the direction opposite to the suction direction by the stator 16, and is fixed by energizing the solenoid coil 14. By sucking the movable element 15 toward the child 16, the valve body 18 is driven and the first spring 17 is compressed, and the movable element 15 continues to move even after the valve body 18 is seated on the seat surface 20. Abuts against the stator 16. The first spring 17 has a nonlinear characteristic that the spring constant increases as the compression amount increases.

これにより、吸引力による可動子１５の加速度は、可動子１５の移動開始後、第１バネ１７の圧縮量が大きくなるほど小さくなる。したがって、第１、第２期間で可動子１５の加速を比較すると、第２期間の方が第１期間よりも可動子１５の加速が緩和される。このため、電磁弁１０において、弁体１８の閉弁応答性を下げることなく、可動子１５が固定子１６に当接するときの当接音を下げることができる。   As a result, the acceleration of the movable element 15 due to the suction force decreases as the compression amount of the first spring 17 increases after the movement of the movable element 15 starts. Therefore, when the acceleration of the mover 15 is compared in the first and second periods, the acceleration of the mover 15 is reduced in the second period than in the first period. For this reason, in the electromagnetic valve 10, it is possible to reduce the contact sound when the mover 15 contacts the stator 16 without reducing the valve closing response of the valve element 18.

また、第１バネ１７の非線形特性はバネ定数に関して大小２つの数値Ａ、Ｂを有し、バネ定数は、圧縮量が所定の閾値Ｃを超えたときに小さい数値Ａから大きい数値Ｂに切り替わる。そして、閾値Ｃは、弁体１８が座面２０に着座して移動を停止したときの圧縮量として設定されている。   The non-linear characteristic of the first spring 17 has two values A and B with respect to the spring constant, and the spring constant is switched from a small value A to a large value B when the compression amount exceeds a predetermined threshold C. The threshold value C is set as a compression amount when the valve body 18 is seated on the seat surface 20 and stops moving.

これにより、可動子１５は、弁体１８が座面２０に着座するまで、第１バネ１７の付勢力によって加速がさほど緩和されず、弁体１８が座面２０に着座した後に、第１バネ１７の付勢力によって加速が大きく緩和される。
このため、より確実に、弁体１８の閉弁応答性を下げることなく、可動子１５が固定子１６に当接するときの当接音を下げることができる。 Thereby, the acceleration of the movable element 15 is not relieved so much by the urging force of the first spring 17 until the valve body 18 is seated on the seat surface 20, and after the valve body 18 is seated on the seat surface 20, The acceleration is greatly relaxed by the urging force of 17.
For this reason, the contact sound when the movable element 15 contacts the stator 16 can be lowered more reliably without lowering the valve closing response of the valve body 18.

さらに、第１バネ１７は小、大ピッチ部２３、２４を有するコイルスプリングである。
これにより、弁体１８の閉弁応答性を下げることなく当接音を緩和することができる第１バネ１７を、容易に製造することができる。 Further, the first spring 17 is a coil spring having small and large pitch portions 23 and 24.
Thereby, the 1st spring 17 which can relieve a contact sound, without reducing the valve-closing responsiveness of the valve body 18 can be manufactured easily.

〔変形例〕
燃料供給ポンプ１の電磁弁１０の態様は、実施例に限定されず、種々の変形例を考えることができる。
例えば、実施例の電磁弁１０によれば、第１バネ１７は、圧縮量が大きいほど強い付勢力を可動子１５に及ぼす圧縮バネであったが、例えば、伸長量が大きいほど強い付勢力を可動子１５に及ぼす伸長バネを第１バネ１７として採用してもよい。
また、実施例の電磁弁１０は、ソレノイドコイル１４への通電開始により加圧室７を吸入路９に対して閉鎖するものであったが、ソレノイドコイル１４への通電開始により加圧室７を吸入路９に対して開放するようにしてもよい。 [Modification]
The aspect of the solenoid valve 10 of the fuel supply pump 1 is not limited to the embodiment, and various modifications can be considered.
For example, according to the electromagnetic valve 10 of the embodiment, the first spring 17 is a compression spring that exerts a stronger biasing force on the movable element 15 as the compression amount is larger. For example, the stronger the biasing force is as the extension amount is larger. An extension spring acting on the movable element 15 may be adopted as the first spring 17.
Further, the solenoid valve 10 of the embodiment closes the pressurizing chamber 7 with respect to the suction passage 9 by starting energization of the solenoid coil 14, but the pressurizing chamber 7 is closed by energizing the solenoid coil 14. You may make it open | release with respect to the suction path 9. FIG.

また、実施例の電磁弁１０によれば、第１バネ１７の非線形特性は、バネ定数に関して大小２つの数値Ａ、Ｂを有し、圧縮量が所定の閾値Ｃを超えたときに小さい数値Ａから大きい数値Ｂに切り替わるものであったが、このような態様に限定されない。例えば、バネ定数に関して大、中、小の３つの数値を有し、バネの弾性変形量が第１の閾値を超えたときに小さい数値から中の数値に切り替わり、第２の閾値を超えたときに中の数値から大きい数値に切り替わるようにしてもよい。   Further, according to the electromagnetic valve 10 of the embodiment, the nonlinear characteristic of the first spring 17 has two numerical values A and B with respect to the spring constant, and a small numerical value A when the compression amount exceeds a predetermined threshold C. However, the present invention is not limited to such a mode. For example, when the spring constant has three numerical values of large, medium, and small, when the amount of elastic deformation of the spring exceeds the first threshold value, the numerical value is switched from the small numerical value to the medium numerical value, and when the second threshold value is exceeded. It is also possible to switch from a middle number to a larger number.

また、バネ定数が弾性変形量の増加に応じて連続的に大きくなるようにしてもよい。
さらに、実施例の電磁弁１０によれば、第１バネ１７はコイルスプリングであったが、板バネ、皿バネ等を第１バネ１７として採用してもよい。 Further, the spring constant may be continuously increased as the amount of elastic deformation increases.
Furthermore, according to the electromagnetic valve 10 of the embodiment, the first spring 17 is a coil spring, but a plate spring, a disc spring, or the like may be adopted as the first spring 17.

１ 燃料供給ポンプ
３ プランジャ
４ シリンダ孔
５ シリンダボディ
６ カム
７ 加圧室
９ 吸入路
１０ 電磁弁
１１ 吐出路
１２ 逆止弁
１４ ソレノイドコイル
１５ 可動子
１６ 固定子
１７ 第１バネ（バネ）
１８ 弁体
２０ 座面（所定の応答位置）
Ａ 数値（小さい数値）
Ｂ 数値（大きい数値）
Ｃ 閾値（所定の閾値） DESCRIPTION OF SYMBOLS 1 Fuel supply pump 3 Plunger 4 Cylinder hole 5 Cylinder body 6 Cam 7 Pressurizing chamber 9 Suction path 10 Solenoid valve 11 Discharge path 12 Check valve 14 Solenoid coil 15 Moment 16 Stator 17 First spring (spring)
18 Valve body 20 Seat surface (predetermined response position)
A Numerical value (small numerical value)
B Numerical value (large numerical value)
C threshold (predetermined threshold)

Claims (4)

ソレノイドコイルへの通電により励磁されて吸引力を及ぼしあう可動子および固定子、前記可動子を前記固定子による吸引方向とは反対の方向に付勢するバネ、ならびに、前記可動子の移動に応じて開弁動作または閉弁動作をする弁体とを備え、
前記ソレノイドコイルへの通電により前記固定子の方に前記可動子を吸引することで、前記弁体を駆動するとともに前記バネを弾性変形させ、さらに前記可動子を前記固定子に当接するまで移動させ、
前記バネは、前記ソレノイドコイルへの通電時の変形量が大きいほどバネ定数が大きくなる非線形特性を有することを特徴とする電磁弁。 A mover and a stator that are excited by energizing the solenoid coil to exert an attractive force, a spring that urges the mover in a direction opposite to the direction of attraction by the stator, and according to the movement of the mover A valve body that opens or closes the valve,
By energizing the solenoid coil to attract the mover toward the stator, the valve body is driven, the spring is elastically deformed, and the mover is moved until it comes into contact with the stator. ,
The solenoid valve according to claim 1, wherein the spring has a non-linear characteristic in which the spring constant increases as the amount of deformation during energization of the solenoid coil increases. 請求項１に記載の電磁弁において、
前記可動子は、前記弁体が所定の応答位置に到達して移動を停止した後も移動し続けて前記固定子に当接し、
前記バネの非線形特性は前記バネ定数に関して大小２つの数値を有し、前記バネ定数は、前記変形量が所定の閾値を超えたときに小さい数値から大きい数値に切り替わり、
前記所定の閾値は、前記弁体が前記所定の応答位置に到達して移動を停止したときの前記変形量と、前記可動子が前記固定子に当接したときの前記変形量との間に設定されていることを特徴とする電磁弁。 The solenoid valve according to claim 1,
The movable element continues to move even after the valve body reaches a predetermined response position and stops moving, and contacts the stator,
The non-linear characteristic of the spring has two numerical values with respect to the spring constant, and the spring constant switches from a small numerical value to a large numerical value when the deformation amount exceeds a predetermined threshold value,
The predetermined threshold is between the deformation amount when the valve body reaches the predetermined response position and stops moving, and the deformation amount when the movable element abuts the stator. Solenoid valve characterized by being set. 請求項１または請求項２に記載の電磁弁において、
前記バネは大小２つのピッチを有するコイルスプリングであり、
このコイルスプリングは、両端のピッチが小さく、かつ両端の間の中央のピッチが大きいことを特徴とする電磁弁。 The solenoid valve according to claim 1 or 2,
The spring is a coil spring having two pitches, large and small,
This coil spring has a small pitch at both ends and a large central pitch between both ends. 請求項１ないし請求項３の内のいずれか１つに記載の電磁弁を備え、内燃機関に燃料を供給する燃料供給ポンプであって、
軸方向に往復動するプランジャと、このプランジャを軸方向に摺動自在に支持して収容するシリンダ孔を有するシリンダボディと、前記プランジャを駆動するカムとを備え、
前記シリンダ孔の軸方向一端を前記プランジャにより液密的に区画することで燃料の加圧室を形成し、
前記電磁弁は、前記加圧室への燃料の吸入路に対して前記加圧室を開閉するように組み込まれ、
前記加圧室からの燃料の吐出路には、この吐出路に対して前記加圧室を開閉する逆止弁が配置され、この逆止弁は、前記加圧室の燃料圧が所定の開弁圧を超えると開弁するように設けられ、
前記プランジャを前記シリンダ孔で軸方向に摺動自在に支持するとともに往復動させて前記加圧室の容積を可変し、
前記加圧室の容積を縮小して前記加圧室の燃料を圧縮しているときに、前記電磁弁により前記加圧室を前記吸入路に対して閉鎖することで、前記加圧室の燃料圧を増圧するとともに前記逆止弁を開弁させ、圧縮した燃料を前記加圧室から吐出することを特徴とする燃料供給ポンプ。 A fuel supply pump comprising the electromagnetic valve according to any one of claims 1 to 3 and supplying fuel to an internal combustion engine,
A plunger that reciprocates in the axial direction; a cylinder body that has a cylinder hole that slidably supports and accommodates the plunger in the axial direction; and a cam that drives the plunger.
A fuel pressurizing chamber is formed by liquid-tightly dividing one end of the cylinder hole in the axial direction by the plunger,
The solenoid valve is incorporated so as to open and close the pressurization chamber with respect to a fuel suction path to the pressurization chamber,
A check valve that opens and closes the pressurization chamber with respect to the discharge passage is disposed in the discharge passage of the fuel from the pressurization chamber. Provided to open when the valve pressure is exceeded,
The plunger is slidably supported in the axial direction in the cylinder hole and reciprocated to change the volume of the pressurizing chamber,
When the volume of the pressurizing chamber is reduced and the fuel in the pressurizing chamber is compressed, the fuel in the pressurizing chamber is closed by closing the pressurizing chamber with respect to the suction passage by the electromagnetic valve. A fuel supply pump characterized by increasing the pressure and opening the check valve to discharge the compressed fuel from the pressurizing chamber.
JP2011023703A 2011-02-07 2011-02-07 Solenoid valve and fuel supply pump Expired - Fee Related JP5691583B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016138526A (en) * 2015-01-28 2016-08-04 株式会社デンソー Intake quantity regulation valve
JP2017101622A (en) * 2015-12-03 2017-06-08 株式会社デンソー Relief valve device, and high pressure pump using the same

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JPS5063621U (en) * 1973-10-08 1975-06-10
JPH09170674A (en) * 1995-12-20 1997-06-30 Saginomiya Seisakusho Inc Solenoid valve
JP2000283315A (en) * 1999-03-29 2000-10-13 Denso Corp Solenoid valve
US20040094128A1 (en) * 2002-07-30 2004-05-20 Magneti Marelli Powertrain S.P.A. Fuel injection system of the common rail type with a variable flow-rate pump
JP2008008298A (en) * 2007-07-09 2008-01-17 Hitachi Ltd Fuel pressure control device
JP2009156312A (en) * 2007-12-26 2009-07-16 Nachi Fujikoshi Corp Solenoid valve

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5063621U (en) * 1973-10-08 1975-06-10
JPH09170674A (en) * 1995-12-20 1997-06-30 Saginomiya Seisakusho Inc Solenoid valve
JP2000283315A (en) * 1999-03-29 2000-10-13 Denso Corp Solenoid valve
US20040094128A1 (en) * 2002-07-30 2004-05-20 Magneti Marelli Powertrain S.P.A. Fuel injection system of the common rail type with a variable flow-rate pump
JP2008008298A (en) * 2007-07-09 2008-01-17 Hitachi Ltd Fuel pressure control device
JP2009156312A (en) * 2007-12-26 2009-07-16 Nachi Fujikoshi Corp Solenoid valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016138526A (en) * 2015-01-28 2016-08-04 株式会社デンソー Intake quantity regulation valve
JP2017101622A (en) * 2015-12-03 2017-06-08 株式会社デンソー Relief valve device, and high pressure pump using the same

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