JP4019360B2

JP4019360B2 - Solenoid valve device

Info

Publication number: JP4019360B2
Application number: JP2002165485A
Authority: JP
Inventors: 史佳村上; 伸治大村
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2002-06-06
Filing date: 2002-06-06
Publication date: 2007-12-12
Anticipated expiration: 2022-06-06
Also published as: JP2004011741A

Description

【０００１】
【発明の属する技術分野】
本発明は、流体通路を開閉する電磁弁装置に関する。
【０００２】
【従来の技術】
従来、コイル部への通電状態に応じて固定コアに対し可動コアを吸引及び離間させることで、その可動コアと一体に動く弁部材により流体通路を開放及び閉塞する電磁弁装置が知られている。
特開平９−１７０６７５号公報に開示されている電磁弁装置には、弁部材に当接することにより弁部材の流体通路開放側への移動を規制する規制部が設けられている。この装置では、規制部に対向する弁部材の端面にゴム製の突起が設けられ、弁部材を突起の先端面で規制部に衝突させることでその衝撃を緩和するようにしている。
【０００３】
【発明が解決しようとする課題】
上記公報に開示の装置では、弁部材端面の突起が閉じたループ状に形成されているため、規制部に当接する突起の先端面が内側で凹んでいる。そのため、弁部材の移動により規制部に突起が押圧されると、突起先端面の凹みと規制部とで囲まれる閉空間の圧力が減じられて突起が所謂吸盤として機能し規制部に吸着する。この吸着により、流体通路の閉塞側に弁部材を移動させるときに弁部材の移動開始が遅れ、応答性が悪化してしまう。
本発明の目的は、弁部材が規制部に衝突するときの衝撃を緩和すると共に、弁部材の規制部への吸着を防止する電磁弁装置を提供することにある。
【０００４】
【課題を解決するための手段】
本発明の請求項１に記載の電磁弁装置によると、弁部材は、規制部に対向する対向端面から突出する突起を少なくとも一つ有する。突起はゴムで形成され、突出端面で規制部に当接する。これにより、流体通路の開放側へ移動する弁部材が規制部に衝突するときの衝撃を突起により緩和することができる。しかも突起の基端部は対向端面との境界を一つのループ状に形成し、突起の突出端面はその頂部から対向端面との境界側に向かうにつれ規制部から離間する形状を有する。すなわち、突起は閉じたループ状に形成されておらず、突起の頂部は凹んでいない。したがって、弁部材の移動により規制部に突起が押圧されても、その突起が規制部に吸着することを回避できるので、流体通路の閉塞側に弁部材を移動させるときの応答性を高めることができる。
【０００５】
本発明の請求項２に記載の電磁弁装置によると、突起は、規制部に対向する弁部材の対向端面の中心軸周りに等間隔に複数配列される。これにより、規制部に弁部材が衝突するときの衝撃を複数の突起で均等に吸収することができる。したがって、突起の耐久性を確保しつつ緩衝特性を向上させることができる。
【０００６】
本発明の請求項３及び４に記載の電磁弁装置によると、突起は、規制部への衝突時の撓み量が０．２３mm以上となるゴムで形成される。これにより、突起の撓み変形により確実に衝撃を吸収することができる。
本発明の請求項５に記載の電磁弁装置によると、弁部材との一体ゴム成形により突起が形成されるので、部品点数を低減して低コスト化を図ることができる。
【０００７】
本発明の請求項６に記載の電磁弁装置によると、弁部材は、弾性を有する支持部材に流体通路開閉のための往復移動を可能に支持される。この支持部材により、弁部材が規制部に衝突するときの衝撃を緩和することができる。
本発明の請求項７記載の電磁弁装置によると、支持部材は板状の弾性材で形成され、板厚方向に貫通する切欠き穴を有する。これにより支持部材の剛性が低下し、支持部材は弾性変形容易となるので、支持部材による緩衝効果を高めることができる。
【０００８】
【発明の実施の形態】
以下、本発明の実施の形態を示す一実施例を図面に基づいて説明する。
本発明の一実施例による電磁弁装置を図１〜図３に示す。本実施例の電磁弁装置１０は、例えば自動車の燃料タンクで発生する蒸発燃料をエンジンへ送り出すシステムに用いられ、蒸発燃料の流路を開閉する弁装置である。
【０００９】
樹脂製の通路部材７０は、弁座部７１と、流体通路としての流入通路７２及び流出通路７３とを形成している。弁座部７１は、流入通路７２の下流側端部と流出通路７３の上流側端部との間において、後述する弁部材５０が着座可能に設けられている。弁部材５０が弁座部７１に着座することで、流入通路７２の下流側端部と流出通路７３の上流側端部との連通が遮断され、流体通路が閉塞される。弁部材５０が弁座部７１から離座することで、流入通路７２の下流側端部と流出通路７３の上流側端部とが連通し、流体通路が開放される。
【００１０】
固定コア１１、ヨーク１２及びコアプレート１３は磁性材で形成されている。固定コア１１は円筒状を呈し、一端部１１ａにヨーク１２がかしめ圧入等により固定されている。コアプレート１３は、固定コア１１の他端部１１ｂ側でヨーク１２に接続されている。コアプレート１３には、板厚方向に貫通する貫通穴１４が設けられている。コイル２１を巻回したボビン２０は、ヨーク１２とコアプレート１３とで挟持するように固定コア１１の外周側に配設されている。ボビン２０及びコイル２１がコイル部を構成している。
【００１１】
樹脂製のベース部材３０は、固定コア１１、ヨーク１２、コアプレート１３、ボビン２０及びコイル２１のインサート成形により形成されている。ベース部材３０は通路部材７０に接合されている。ベース部材３０には、コネクタ部３１及び規制部３６が設けられている。コネクタ部３１内にターミナル３２が埋設されており、コイル２１と電気的に接続されている。本実施例では、ターミナル３２に電気的に接続される制御装置（図示しない）により、制御指令値に応じた時間だけ電流がコイル２１に供給される。規制部３６は、固定コア１１の内側を充填するように概ね円柱状に形成されている。規制部３６は、固定コア１１の端部１１ｂ側から弁部材５０側に突出し、コアプレート１３の貫通穴１４内に挿入されている。規制部３６の突出側端面３６ａは、固定コア１１の中心軸Ｑに垂直な平坦面に形成されている。規制部３６の突出側端部の外周側に、円筒状の案内部材３３が固定されている。案内部材３３については、本実施例のように規制部３６と別体に形成してもよいし、あるいは規制部３６と一体に形成してもよい。
【００１２】
可動コア４０は磁性材で円筒状に形成されている。可動コア４０は、コアプレート１３の貫通穴１４の内周側に固定コア１１と同軸上に配設されている。固定コア１１の端部１１ｂに対向する可動コア４０の一端部４０ａ側は、その内周壁で案内部材３３の外周壁に摺接し案内される。これにより、可動コア４０は中心軸Ｒ方向の両側に往復移動可能である。可動コア４０の内周側には、付勢手段であるコイルスプリング４１が収容されている。
【００１３】
支持部材６０は、円板状の弾性材たる板ばねで構成されている。支持部材６０の外周部は、ゴム製のリング部材６１を介してベース部材３０と通路部材７０とに挟持されている。これにより支持部材６０は、可動コア４０の他端部４０ｂと弁座部７１との間に拡がり、一方の面６０ａを規制部３６の端面３６ａ及びコアプレート１３の反固定コア側の面１３ａに対向させている。支持部材６０の面６０ａ側には、可動コア４０の他端部４０ｂが溶接等で固定されている。支持部材６０の面６０ａと案内部材３３の反固定コア側端面との間にコイルスプリング４１が介装されている。コイルスプリング４１は、弁座部７１側に向かって支持部材６０を付勢している。
【００１４】
支持部材６０の中央部には、板厚方向に貫通する切欠き穴６２が設けられている。本実施例の切欠き穴６２は、支持部材６０の中心部から周方向で等間隔の３箇所に向かって放射状に延びる形状を呈している。この切欠き穴６２の中心部に弁部材５０が嵌合固定されている。これにより弁部材５０は、可動コア４０と一体に往復移動可能に支持部材６０に支持されている。
【００１５】
弁部材５０はゴムで形成されている。弁部材５０は、シート部５２と当接部５４とを有する。シート部５２は、支持部材６０の上記面６０ａとは反対側の面６０ｂから弁座部７１側へ突出する円盤状に形成されている。シート部５２は、その突出側端面５２ａで弁座部７１に着座可能である。当接部５４は、支持部材６０の面６０ａから規制部３６側に突出する円盤状に形成されている。当接部５４は可動コア４０内に同軸上に収容され、中心軸Ｏに垂直な平坦面で形成される突出側端面５４ａを規制部３６の端面３６ａに対向させている。以下、当接部５４の端面５４ａを対向端面５４ａという。当接部５４は、対向端面５４ａから突出する複数（本実施例では３つ）の突起５６を有している。それら複数の突起５６は、切欠き穴６２の放射状部分に対応するように対向端面５４ａの中心軸Ｏ周りに等間隔に配列されている。各突起５６の基端部は対向端面５４ａとの境界Ｄを一つのループ状に形成している。各突起５６の突出端面５６ａは、本実施例では中心軸上に位置する頂部Ｔから境界Ｄ側に向かうにつれ規制部３６から離間する概ね半球状に形成されている。すなわち突出端面５６ａは、任意の縦断面における外形線が頂部Ｔから境界Ｄ側に向かって滑らかに湾曲する形状を有する。各突起５６の突出端面５６ａは規制部３６の端面３６ａに当接可能である。
【００１６】
弁部材５０を形成するゴムとしては、例えばフッ素ゴム等、公知のゴムを使用できるが、図４に白抜き矢印で示すように、突起５６が規制部３６に衝突するときの撓み量が０．２３mm以上となるゴムを使用することが好ましい。かかる突起５６の撓み量が０．２３ｍｍ以上となるとき、図４に示すように、規制部３６への衝突時における弁部材５０のバウンド量が小さくなり、制御指令値としてのデューティ比に対する流出流量のリニアリティに生じる乱れΔｑ（図７（Ａ）参照）が０．４Ｌ／ｍｉｎ以下に減少する。また、弁部材５０の形成ゴムとしては、図５に示すように、−２０℃から１２０℃の温度範囲における硬度がおよそ７０Ｈｓ以下のゴムを使用することが好ましい。このような硬度のゴムを使用することで、装置外周の温度が零下となる場合にも、突起５６による所望の緩衝特性を得ることができる。本実施例では、上記突起５６の撓み量及び硬度に関する規定を共に満たすフッ素ゴムで弁部材５０を形成している。
【００１７】
次に電磁弁装置１０の作動について説明する。
（１）コイル２１に通電されていないとき、可動コア４０はコイルスプリング４１の付勢力により、支持部材６０を弁座部７１側に僅かに撓ませた状態で固定コア１１から離間する。このとき、弁部材５０は規制部３６から離間し、弁座部７１に離座する。これにより、流入通路７２と流出通路７３との連通が遮断され流体通路が閉塞されるため、流入通路７２の上流側端部に供給された流体は流出通路７３の下流側端部から流出されない。
【００１８】
（２）コイル２１に通電すると、コイル２１は可動コア４０を固定コア１１側に吸引する磁力を発生する。すると可動コア４０は、コイルスプリング４１の付勢力に抗して支持部材６０を規制部３６側に撓ませながら固定コア１１に接近する。その支持部材６０の撓みに伴って弁部材５０が規制部３６側に向かって移動し、シート部５２が弁座部７１から離座する。これにより、流入通路７２と流出通路７３とが連通し流体通路が開放されるため、流入通路７２の上流側端部に供給された流体が流出通路７３の下流側端部から流出する。
【００１９】
コイル２１への通電による可動コア４０及び弁部材５０の移動は、フルリフト時に弁部材５０の当接部５４が規制部３６に当接することで規制される。電磁弁装置１０において弁部材５０は、当接部５４にゴムで形成した突起５６で規制部３６に衝突する。しかも電磁弁装置１０において弁部材５０を支持する支持部材６０は、弾性を有する板ばねで構成されることに加え、切欠き穴６２により板厚方向すなわち弁部材５０の往復移動方向に弾性変形容易となっている。このような突起５６及び支持部材６０により、弁部材５０が規制部３６に衝突するときの衝撃は充分に緩和される。したがって電磁弁装置１０では、図６（Ａ）に矢印Ｘで指し示すように衝突時における弁部材５０のバウンドが突起５６を設けない場合（図６（Ｂ）参照）と比べて抑制される。その結果、図７（Ａ）に示すように、デューティ比に対する流出流量のリニアリティに生じる乱れΔｑが、突起５６を設けない場合（図７（Ｂ）参照）に比べて小さくなる。
【００２０】
さらに電磁弁装置１０において上記効果をもたらす突起５６は、ループ状に延びる上記境界線Ｄ側に頂部Ｔから向かうにつれ規制部３６から離間する形状を突出端面５６ａに有しているので、突起５６の突出端面５６ａと規制部３６の端面３６ａとが当接してもそれら面５６ａ，３６ａの間には閉空間が形成されない。これにより突起５６の突出端面５６ａが規制部３６の端面３６ａに吸着することを防止できるので、弁部材５０が流体通路を閉塞するときの応答性を高めることができる。加えて電磁弁装置１０では、規制部３６に弁部材５０が衝突するときの衝撃について、弁部材５０の対向端面５４ａの中心軸Ｏ周りに等間隔に設けられた複数の突起５６で均等に分散して吸収することができる。よって、突起５６の耐久性が向上する。
【００２１】
以上説明した上記実施例では、弁部材５０の対向端面５４ａに突起５６が３つ設けられていたが、図８に変形例を示すように突起５６を１つだけ設けるようにしてもよいし、２つ又は４つ以上の突起５６を設けるようにしてもよい。尚、突起５６を複数設ける場合には、上記実施例のように対向端面５４ａの中心軸Ｏ周りに等間隔に設けることが望ましい。
また上記実施例では、突出端面５６ｂの頂部Ｔが突起５６の中心軸上の点状に形成されていたが、突出端面の頂部は突起の形状に応じて例えば所定長さで延びる峰続き状に形成してもよい。
【図面の簡単な説明】
【図１】本発明の一実施例による電磁弁装置を示す断面図（Ａ）及び（Ａ）における要部の拡大図（Ｂ）である。
【図２】図１に示す支持部材及び弁部材の底面図である。
【図３】図１に示す弁部材の平面図である。
【図４】図１に示す弁部材を形成するゴムについて説明するための特性図である。
【図５】図１に示す弁部材を形成するゴムについて説明するための別の特性図である。
【図６】本発明の一実施例による電磁弁装置（Ａ）と比較のための装置（Ｂ）とにおける弁部材の移動位置の経時変化を示す特性図である。
【図７】本発明の一実施例による電磁弁装置（Ａ）と比較のための装置（Ｂ）とにおける流出流量とデューティ比との相関を示す特性図である。
【図８】図１に示す弁部材の変形例を示す平面図（Ａ）及び断面図（Ｂ）である。
【符号の説明】
１０電磁弁装置
１１固定コア
２０ボビン（コイル部）
２１コイル（コイル部）
３０ベース部材
３３案内部材
３６規制部
４０可動コア
４１コイルスプリング
５０弁部材
５２シート部
５４当接部
５４ａ対向端面
５６突起
５６ａ突出端面
６０支持部材
６２切欠き穴
７０通路部材
７１弁座部
７２流入通路（流体通路）
７３流出通路（流体通路）
Ｄ境界線
Ｏ対向端面の中心軸
Ｔ頂部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic valve device that opens and closes a fluid passage.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is known an electromagnetic valve device that opens and closes a fluid passage by a valve member that moves integrally with a movable core by attracting and separating the movable core with respect to the fixed core according to the energization state of the coil portion. .
The electromagnetic valve device disclosed in Japanese Patent Laid-Open No. 9-170675 is provided with a restricting portion that restricts the movement of the valve member toward the fluid passage opening side by contacting the valve member. In this device, a rubber protrusion is provided on the end face of the valve member facing the restricting portion, and the impact is mitigated by causing the valve member to collide with the restricting portion at the tip end face of the protrusion.
[0003]
[Problems to be solved by the invention]
In the apparatus disclosed in the above publication, the protrusion on the end face of the valve member is formed in a closed loop shape, so that the front end face of the protrusion that contacts the restricting portion is recessed on the inside. Therefore, when the protrusion is pressed against the restricting portion by the movement of the valve member, the pressure in the closed space surrounded by the recess on the tip end surface of the protrusion and the restricting portion is reduced, and the protrusion functions as a so-called suction cup and is attracted to the restricting portion. Due to this adsorption, when the valve member is moved to the closed side of the fluid passage, the start of movement of the valve member is delayed, and the responsiveness is deteriorated.
The objective of this invention is providing the solenoid valve apparatus which prevents the adsorption | suction to the control part of a valve member while mitigating the impact when a valve member collides with a control part.
[0004]
[Means for Solving the Problems]
According to the electromagnetic valve device of the first aspect of the present invention, the valve member has at least one protrusion protruding from the opposed end surface facing the restricting portion. The protrusion is made of rubber, and comes into contact with the restriction portion at the protruding end surface. Thereby, the impact when the valve member moving to the opening side of the fluid passage collides with the restricting portion can be mitigated by the protrusion. Moreover, the base end portion of the protrusion forms a boundary with the opposing end surface in one loop shape, and the protruding end surface of the protrusion has a shape that is separated from the restricting portion as it goes from the top to the boundary side with the opposing end surface. That is, the protrusion is not formed in a closed loop shape, and the top of the protrusion is not recessed. Therefore, even if the protrusion is pressed by the restricting portion due to the movement of the valve member, the protrusion can be prevented from adsorbing to the restricting portion, so that the responsiveness when moving the valve member to the closed side of the fluid passage can be improved. it can.
[0005]
According to the electromagnetic valve device of the second aspect of the present invention, the plurality of protrusions are arranged at equal intervals around the central axis of the opposed end surface of the valve member facing the restricting portion. Thereby, the impact when the valve member collides with the restricting portion can be evenly absorbed by the plurality of protrusions. Therefore, it is possible to improve the buffer characteristics while ensuring the durability of the protrusions.
[0006]
According to the electromagnetic valve device of the third and fourth aspects of the present invention, the protrusion is formed of rubber that has a deflection amount of 0.23 mm or more at the time of collision with the restricting portion. Thereby, an impact can be reliably absorbed by the bending deformation of the projection.
According to the electromagnetic valve device of the fifth aspect of the present invention, since the protrusion is formed by the integral rubber molding with the valve member, the number of parts can be reduced and the cost can be reduced.
[0007]
According to the electromagnetic valve device of the sixth aspect of the present invention, the valve member is supported by the elastic support member so as to be able to reciprocate for opening and closing the fluid passage. With this support member, it is possible to mitigate the impact when the valve member collides with the restricting portion.
According to the electromagnetic valve device of the seventh aspect of the present invention, the support member is formed of a plate-like elastic material and has a notch hole penetrating in the plate thickness direction. As a result, the rigidity of the support member is lowered and the support member is easily elastically deformed, so that the buffering effect of the support member can be enhanced.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example showing an embodiment of the present invention will be described with reference to the drawings.
An electromagnetic valve device according to an embodiment of the present invention is shown in FIGS. The electromagnetic valve device 10 of this embodiment is a valve device that opens and closes a flow path of evaporated fuel, for example, used in a system that sends evaporated fuel generated in a fuel tank of an automobile to an engine.
[0009]
The resin passage member 70 forms a valve seat 71 and an inflow passage 72 and an outflow passage 73 as fluid passages. The valve seat 71 is provided between a downstream end of the inflow passage 72 and an upstream end of the outflow passage 73 so that a later-described valve member 50 can be seated. When the valve member 50 is seated on the valve seat 71, the communication between the downstream end of the inflow passage 72 and the upstream end of the outflow passage 73 is blocked, and the fluid passage is closed. When the valve member 50 is separated from the valve seat 71, the downstream end of the inflow passage 72 and the upstream end of the outflow passage 73 communicate with each other, and the fluid passage is opened.
[0010]
The fixed core 11, the yoke 12, and the core plate 13 are made of a magnetic material. The fixed core 11 has a cylindrical shape, and a yoke 12 is fixed to the one end portion 11a by caulking and press fitting. The core plate 13 is connected to the yoke 12 on the other end 11 b side of the fixed core 11. The core plate 13 is provided with a through hole 14 penetrating in the thickness direction. The bobbin 20 around which the coil 21 is wound is disposed on the outer peripheral side of the fixed core 11 so as to be sandwiched between the yoke 12 and the core plate 13. The bobbin 20 and the coil 21 constitute a coil part.
[0011]
The resin base member 30 is formed by insert molding of the fixed core 11, the yoke 12, the core plate 13, the bobbin 20 and the coil 21. The base member 30 is joined to the passage member 70. The base member 30 is provided with a connector part 31 and a restriction part 36. A terminal 32 is embedded in the connector portion 31 and is electrically connected to the coil 21. In the present embodiment, current is supplied to the coil 21 for a time corresponding to the control command value by a control device (not shown) electrically connected to the terminal 32. The restricting portion 36 is formed in a substantially columnar shape so as to fill the inside of the fixed core 11. The restricting portion 36 protrudes from the end portion 11 b side of the fixed core 11 to the valve member 50 side and is inserted into the through hole 14 of the core plate 13. The protruding side end surface 36 a of the restricting portion 36 is formed on a flat surface perpendicular to the central axis Q of the fixed core 11. A cylindrical guide member 33 is fixed to the outer peripheral side of the protruding end portion of the restricting portion 36. The guide member 33 may be formed separately from the restricting portion 36 as in the present embodiment, or may be formed integrally with the restricting portion 36.
[0012]
The movable core 40 is formed of a magnetic material in a cylindrical shape. The movable core 40 is disposed coaxially with the fixed core 11 on the inner peripheral side of the through hole 14 of the core plate 13. One end portion 40a side of the movable core 40 facing the end portion 11b of the fixed core 11 is slidably in contact with the outer peripheral wall of the guide member 33 and guided by the inner peripheral wall thereof. Thereby, the movable core 40 can be reciprocated on both sides in the central axis R direction. A coil spring 41 as a biasing means is accommodated on the inner peripheral side of the movable core 40.
[0013]
The support member 60 is configured by a leaf spring that is a disk-like elastic material. The outer periphery of the support member 60 is sandwiched between the base member 30 and the passage member 70 via a rubber ring member 61. As a result, the support member 60 expands between the other end portion 40b of the movable core 40 and the valve seat portion 71, and one surface 60a becomes the end surface 36a of the restricting portion 36 and the surface 13a of the core plate 13 on the side opposite to the fixed core. They are facing each other. The other end portion 40b of the movable core 40 is fixed to the surface 60a side of the support member 60 by welding or the like. A coil spring 41 is interposed between the surface 60 a of the support member 60 and the end surface on the side opposite to the fixed core of the guide member 33. The coil spring 41 urges the support member 60 toward the valve seat 71 side.
[0014]
A notch hole 62 that penetrates in the thickness direction is provided at the center of the support member 60. The cutout holes 62 of the present embodiment have a shape that extends radially from the center of the support member 60 toward three equally spaced locations in the circumferential direction. The valve member 50 is fitted and fixed at the center of the notch hole 62. Thus, the valve member 50 is supported by the support member 60 so as to be capable of reciprocating integrally with the movable core 40.
[0015]
The valve member 50 is made of rubber. The valve member 50 includes a seat portion 52 and a contact portion 54. The seat portion 52 is formed in a disc shape that protrudes toward the valve seat portion 71 from a surface 60b of the support member 60 opposite to the surface 60a. The seat portion 52 can be seated on the valve seat portion 71 at its protruding side end surface 52a. The contact portion 54 is formed in a disk shape that protrudes from the surface 60 a of the support member 60 toward the restricting portion 36. The contact portion 54 is accommodated coaxially in the movable core 40, and a protruding side end surface 54 a formed by a flat surface perpendicular to the central axis O is opposed to the end surface 36 a of the restricting portion 36. Hereinafter, the end surface 54a of the contact portion 54 is referred to as an opposed end surface 54a. The contact portion 54 has a plurality of (three in this embodiment) projections 56 protruding from the opposed end surface 54a. The plurality of protrusions 56 are arranged at equal intervals around the central axis O of the opposed end surface 54 a so as to correspond to the radial portions of the cutout holes 62. The base end portion of each projection 56 forms a boundary D with the opposing end surface 54a in a single loop shape. In this embodiment, the protruding end surface 56a of each protrusion 56 is formed in a substantially hemispherical shape that is separated from the restricting portion 36 toward the boundary D side from the top portion T located on the central axis. That is, the protruding end surface 56a has a shape in which an outline in an arbitrary longitudinal section is smoothly curved from the top T toward the boundary D side. The protruding end surface 56 a of each protrusion 56 can abut on the end surface 36 a of the restricting portion 36.
[0016]
As the rubber forming the valve member 50, for example, a known rubber such as fluoro rubber can be used. As shown by a white arrow in FIG. 4, the deflection amount when the projection 56 collides with the restricting portion 36 is 0. It is preferable to use rubber having a thickness of 23 mm or more. When the deflection amount of the projection 56 is 0.23 mm or more, as shown in FIG. 4, the bound amount of the valve member 50 at the time of collision with the restricting portion 36 is reduced, and the outflow flow rate with respect to the duty ratio as the control command value Disturbance Δq (see FIG. 7 (A)) generated in the linearity of 1 is reduced to 0.4 L / min or less. Further, as the rubber forming the valve member 50, as shown in FIG. 5, it is preferable to use a rubber having a hardness in the temperature range of −20 ° C. to 120 ° C. of about 70 Hs or less. By using rubber having such a hardness, even when the temperature of the outer periphery of the apparatus is below zero, a desired buffer characteristic by the protrusion 56 can be obtained. In the present embodiment, the valve member 50 is made of fluororubber that satisfies both the deflection amount and hardness of the projection 56.
[0017]
Next, the operation of the electromagnetic valve device 10 will be described.
(1) When the coil 21 is not energized, the movable core 40 is separated from the fixed core 11 by the biasing force of the coil spring 41 in a state where the support member 60 is slightly bent toward the valve seat 71. At this time, the valve member 50 is separated from the restriction portion 36 and is separated from the valve seat portion 71. As a result, the communication between the inflow passage 72 and the outflow passage 73 is blocked and the fluid passage is closed, so that the fluid supplied to the upstream end of the inflow passage 72 does not flow out from the downstream end of the outflow passage 73.
[0018]
(2) When the coil 21 is energized, the coil 21 generates a magnetic force that attracts the movable core 40 toward the fixed core 11. Then, the movable core 40 approaches the fixed core 11 while bending the support member 60 toward the regulating portion 36 against the urging force of the coil spring 41. With the bending of the support member 60, the valve member 50 moves toward the restricting portion 36, and the seat portion 52 is separated from the valve seat portion 71. As a result, the inflow passage 72 and the outflow passage 73 communicate with each other and the fluid passage is opened, so that the fluid supplied to the upstream end of the inflow passage 72 flows out from the downstream end of the outflow passage 73.
[0019]
Movement of the movable core 40 and the valve member 50 due to energization of the coil 21 is restricted by the contact portion 54 of the valve member 50 contacting the restriction portion 36 during full lift. In the electromagnetic valve device 10, the valve member 50 collides with the restricting portion 36 by a protrusion 56 formed of rubber on the contact portion 54. In addition, the support member 60 that supports the valve member 50 in the electromagnetic valve device 10 is configured by an elastic leaf spring, and is easily elastically deformed in the plate thickness direction, that is, the reciprocating direction of the valve member 50 by the notch hole 62. It has become. Due to the projection 56 and the support member 60, the impact when the valve member 50 collides with the restricting portion 36 is sufficiently mitigated. Therefore, in the electromagnetic valve device 10, as indicated by the arrow X in FIG. 6A, the bounce of the valve member 50 at the time of collision is suppressed compared to the case where the protrusion 56 is not provided (see FIG. 6B). As a result, as shown in FIG. 7A, the turbulence Δq generated in the linearity of the outflow flow rate with respect to the duty ratio becomes smaller than when the protrusion 56 is not provided (see FIG. 7B).
[0020]
Further, the projection 56 that brings about the above effect in the electromagnetic valve device 10 has a shape on the projecting end surface 56a that is separated from the regulating portion 36 toward the boundary line D side that extends in a loop shape. Even if the projecting end surface 56a and the end surface 36a of the restricting portion 36 come into contact with each other, a closed space is not formed between the surfaces 56a and 36a. As a result, the protruding end surface 56a of the protrusion 56 can be prevented from adsorbing to the end surface 36a of the restricting portion 36, so that the responsiveness when the valve member 50 closes the fluid passage can be enhanced. In addition, in the electromagnetic valve device 10, the impact when the valve member 50 collides with the restricting portion 36 is evenly distributed by the plurality of protrusions 56 provided at equal intervals around the central axis O of the opposed end surface 54 a of the valve member 50. Can be absorbed. Therefore, the durability of the protrusion 56 is improved.
[0021]
In the above-described embodiment, three protrusions 56 are provided on the opposed end surface 54a of the valve member 50. However, only one protrusion 56 may be provided as shown in FIG. Two or four or more protrusions 56 may be provided. When a plurality of protrusions 56 are provided, it is desirable to provide them at regular intervals around the central axis O of the opposed end surface 54a as in the above embodiment.
Further, in the above-described embodiment, the top portion T of the projecting end surface 56b is formed in a dot shape on the central axis of the projection 56. It may be formed.
[Brief description of the drawings]
FIG. 1 is an enlarged view (B) of a main part in cross-sectional views (A) and (A) showing an electromagnetic valve device according to an embodiment of the present invention.
2 is a bottom view of the support member and the valve member shown in FIG. 1. FIG.
FIG. 3 is a plan view of the valve member shown in FIG. 1;
FIG. 4 is a characteristic diagram for explaining rubber forming the valve member shown in FIG. 1;
FIG. 5 is another characteristic diagram for explaining rubber forming the valve member shown in FIG. 1;
FIG. 6 is a characteristic diagram showing a change with time of the moving position of the valve member in the electromagnetic valve device (A) according to one embodiment of the present invention and the device (B) for comparison.
FIG. 7 is a characteristic diagram showing the correlation between the outflow rate and the duty ratio in the electromagnetic valve device (A) according to one embodiment of the present invention and the device (B) for comparison.
8 is a plan view (A) and a cross-sectional view (B) showing a modification of the valve member shown in FIG. 1. FIG.
[Explanation of symbols]
10 Solenoid valve device 11 Fixed core 20 Bobbin (coil part)
21 Coil (Coil part)
30 Base member 33 Guide member 36 Restriction part 40 Movable core 41 Coil spring 50 Valve member 52 Seat part 54 Contact part 54a Opposing end face 56 Projection 56a Projection end face 60 Support member 62 Notch hole 70 Path member 71 Valve seat part 72 Inflow path (Fluid passage)
73 Outflow passage (fluid passage)
D Boundary line O Center axis T of opposite end face Top

Claims

A valve member that opens and closes the fluid passage by reciprocating; and
A fixed core;
A movable core that is provided so as to be movable together with the valve member, opens the fluid passage by the valve member by approaching the fixed core, and closes the fluid passage by the valve member by separating from the fixed core. When,
A coil portion that generates a magnetic force that attracts the movable core to the fixed core by energization;
A restricting portion for restricting movement of the valve member to the fluid passage opening side by contacting the valve member;
A solenoid valve device comprising:
The valve member has at least one protrusion protruding from an opposing end surface facing the restriction portion,
The protrusion is formed of rubber;
The base end portion of the protrusion forms a boundary with the facing end surface in a single loop shape,
The projecting end surface of said projection abutting on the regulating portion is to be separated from the regulating unit as the direction from the top to the boundary side, the solenoid valve device in cross-section, characterized that you have been formed in a semicircular shape.

The electromagnetic valve device according to claim 1, wherein a plurality of the protrusions are arranged at equal intervals around a central axis of the opposed end surface.

3. The electromagnetic valve device according to claim 1, wherein the protrusion is formed of rubber having a deflection amount of 0.23 mm or more at the time of a collision with the restricting portion.

The electromagnetic valve device according to claim 3, wherein the protrusion is made of fluoro rubber.

The electromagnetic valve device according to claim 1, wherein the protrusion is formed by integral rubber molding with the valve member.

The electromagnetic valve device according to any one of claims 1 to 5, wherein the valve member is supported by an elastic support member such that the reciprocation is possible.

The electromagnetic valve device according to claim 6, wherein the support member is formed of a plate-like elastic material and has a cutout hole penetrating in the plate thickness direction.