JPH08121127A - Sealing structure for auxiliary chamber valve guide section in gas engine - Google Patents
Sealing structure for auxiliary chamber valve guide section in gas engineInfo
- Publication number
- JPH08121127A JPH08121127A JP6289118A JP28911894A JPH08121127A JP H08121127 A JPH08121127 A JP H08121127A JP 6289118 A JP6289118 A JP 6289118A JP 28911894 A JP28911894 A JP 28911894A JP H08121127 A JPH08121127 A JP H08121127A
- Authority
- JP
- Japan
- Prior art keywords
- chamber
- sub
- valve
- elastic seal
- auxiliary chamber
- 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.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は主として天然ガス燃料を
圧縮着火させるガスエンジン、特に副室(副燃焼室)と
主室(主燃焼室)とを結ぶ連絡孔を開閉する副室弁の案
内部のシール構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a gas engine for compression ignition of natural gas fuel, and more particularly, a guide for a sub-chamber valve for opening and closing a connecting hole connecting the sub-chamber (sub-combustion chamber) and the main chamber (main-combustion chamber). The present invention relates to a seal structure of a part.
【0002】[0002]
【従来の技術】この種のガスエンジンはシリンダヘツド
の内部にセラミツクスからなる副室が設けられ、シリン
ダヘツドの副室とシリンダの主室とを結ぶ連絡孔を開閉
する副室弁の弁ステムが、副室を貫通してシリンダヘツ
ドの上部の動弁機構へ当接される。エンジンの吸気行程
で副室の内部圧力が低い内に副室弁を閉じ、ガス燃料を
副室へ供給し、圧縮行程の後半で副室弁を開き、高温の
吸気を主室から副室へ供給し、吸気をガス燃料と急速か
つ均一に混合して1次燃焼を図る。2. Description of the Related Art A gas engine of this type is provided with a sub chamber made of ceramics inside a cylinder head, and a valve stem of a sub chamber valve for opening and closing a communication hole connecting the sub chamber of the cylinder head and the main chamber of the cylinder. , Penetrates the sub chamber and is brought into contact with the valve operating mechanism above the cylinder head. During the intake stroke of the engine, the sub-chamber valve is closed while the internal pressure of the sub-chamber is low, gas fuel is supplied to the sub-chamber, and the sub-chamber valve is opened in the latter half of the compression stroke to transfer hot intake air from the main chamber to the sub-chamber. It is supplied and the intake air is rapidly and uniformly mixed with the gas fuel to achieve the primary combustion.
【0003】副室弁の弁ステムがシリンダヘツドの案内
筒に支持される部分は、副室の燃焼ガスが洩れないよう
に弾性シールにより封止される。すなわち、図6に示す
ように、副室弁の弁ステム18aはシリンダヘツドの副
室よりも上方部分に嵌合支持した案内筒8に嵌挿され、
案内筒8の上端部に筒型のシール手段Aを装着される。
シール手段Aはゴムなどからなる弾性シール30と、弾
性シール30を案内筒8の上端部へ係止する逆カツプ形
の捕縛筒34とから構成される。弾性シール30は捕縛
筒34の端壁34aよりも上方へ突出する突出部30a
に、弁ステム18aに常時接する主リツプ30bを形成
され、突出部30aの外周壁に断面半円形の環状溝が備
えられ、該環状溝に係合した金属製の弾性環31の縮閉
力により主リツプ30bが弁ステム18aへ押し付けら
れる。弾性シール30の捕縛筒34に嵌合される下半部
は、弾性シール30の軸方向移動を抑えるために、案内
筒8の外周壁に形成した環状溝8aに、弾性シール30
の突条30dを嵌合され、かつ捕縛筒34により押えら
れる。The portion where the valve stem of the sub chamber valve is supported by the guide cylinder of the cylinder head is sealed by an elastic seal so that the combustion gas in the sub chamber does not leak. That is, as shown in FIG. 6, the valve stem 18a of the sub-chamber valve is fitted and inserted into the guide tube 8 which is fitted and supported in a portion above the sub-chamber of the cylinder head.
A tubular sealing means A is attached to the upper end of the guide tube 8.
The sealing means A is composed of an elastic seal 30 made of rubber or the like, and an inverted cup-shaped catching cylinder 34 for locking the elastic seal 30 to the upper end of the guide cylinder 8. The elastic seal 30 has a protruding portion 30a that protrudes above the end wall 34a of the catching cylinder 34.
Is formed with a main lip 30b which is always in contact with the valve stem 18a, and an outer peripheral wall of the protruding portion 30a is provided with an annular groove having a semicircular cross section. The main lip 30b is pressed against the valve stem 18a. The lower half portion of the elastic seal 30 fitted into the catching cylinder 34 has an annular groove 8a formed on the outer peripheral wall of the guide cylinder 8 in order to suppress the axial movement of the elastic seal 30.
The protrusion 30d is fitted and is pressed by the catching cylinder 34.
【0004】しかし、従来のガスエンジンでは、副室で
のガス燃料の1次燃焼に伴い燃焼ガスの圧力が高くなる
と、副室弁案内部の弾性シール30は十分に機能を果し
ているとは言えない。そこで、弁ステム18aに外嵌し
た弾性シール30の緊迫力を強くすると、摩擦損失が増
加し、副室弁案内部を潤滑する油が不足することが懸念
される。However, in the conventional gas engine, when the pressure of the combustion gas increases with the primary combustion of the gas fuel in the sub chamber, it can be said that the elastic seal 30 of the sub chamber valve guide portion functions sufficiently. Absent. Therefore, if the elastic force of the elastic seal 30 externally fitted to the valve stem 18a is increased, the friction loss increases, and there is a concern that the oil for lubricating the sub chamber valve guide portion will run short.
【0005】[0005]
【発明が解決しようとする課題】本発明の目的は上述の
問題に鑑み、副室弁案内部を封止する弾性シールの緊迫
力を、副室の内部圧力の変化に応じて加減することによ
り、良好なシール性と潤滑性を得るようにした、ガスエ
ンジンにおける副室弁案内部のシール構造を提供するこ
とにある。SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to adjust the tightening force of an elastic seal that seals a sub-chamber valve guide portion according to a change in internal pressure of the sub-chamber. Another object of the present invention is to provide a seal structure for a sub chamber valve guide portion in a gas engine, which is configured to obtain good sealability and lubricity.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明の構成はシリンダヘツドの内部にセラミツク
からなる副室を配設し、該副室へ天然ガス燃料を供給す
る燃料供給装置を備え、シリンダの主室と副室を結ぶ連
絡孔にこれを開閉する副室弁を設けたガスエンジンにお
いて、シリンダヘツドの案内筒に摺動可能に支持した副
室弁の弁ステムに弾性シールを外挿し、弾性シールの内
部に弾性シールを外周側から弁ステムへ押し付けるアク
チユエータを備え、アクチユエータの押付力を副室の内
部圧力に対応して制御する押付力制御手段を備えたもの
である。In order to achieve the above object, the structure of the present invention is a fuel supply system in which a sub-chamber made of ceramic is arranged inside a cylinder head and a natural gas fuel is supplied to the sub-chamber. In a gas engine equipped with a sub chamber valve that opens and closes the communication hole that connects the main chamber and the sub chamber of the cylinder, an elastic seal is attached to the valve stem of the sub chamber valve that is slidably supported by the guide tube of the cylinder head. And an actuator that presses the elastic seal against the valve stem from the outer peripheral side inside the elastic seal, and a pressing force control means that controls the pressing force of the actuator in accordance with the internal pressure of the sub chamber.
【0007】[0007]
【作用】本発明はシリンダヘツドの案内筒の上端部に係
止した弾性シールを弁ステムに外嵌し、弾性シールの弁
ステムに対する緊迫力をエンジンの行程に応じて、アク
チユエータとしての圧電素子により調節するものであ
る。すなわち、エンジンの行程を検出する各種のセンサ
の信号に基づく電子制御装置の出力により、予め設定さ
れた電圧をエンジンのサイクルごとに圧電素子へ印加す
れば、電圧に対応する弾性シールの緊迫力が弁ステムに
作用する。弾性シールの緊迫力はエンジンのサイクルご
とに変化するので、副室弁の開閉動作に伴う弁ステムの
摺動による摩擦損失が減じられ、また副室弁案内部への
潤滑油の流入が改善され、油不足が回避される。According to the present invention, the elastic seal locked to the upper end of the guide tube of the cylinder head is externally fitted to the valve stem, and the elastic seal is applied to the valve stem by a piezoelectric element as an actuator depending on the stroke of the engine. To adjust. That is, if a preset voltage is applied to the piezoelectric element for each cycle of the engine by the output of the electronic control device based on the signals of various sensors that detect the stroke of the engine, the elastic sealing force corresponding to the voltage is generated. Acts on the valve stem. Since the elastic seal tension changes with each engine cycle, friction loss due to sliding of the valve stem associated with opening and closing of the auxiliary chamber valve is reduced, and the flow of lubricating oil into the auxiliary chamber valve guide is improved. , Oil shortage is avoided.
【0008】[0008]
【実施例】図1に示すように、ガスエンジンは金属製の
シリンダ本体19に好ましくはセラミツクス製のシリン
ダライナ20を嵌装し、一方、金属製のシリンダヘツド
25の下面円筒部25aにセラミツクス製の逆カツプ形
のヘツドライナ16を嵌装し、シリンダ本体19の上端
にシリンダヘツド25を結合し、ピストン22をシリン
ダライナ20とヘツドライナ16とに嵌合してなる。好
ましくは、ピストン22は冠部にセラミツクス製のピス
トンライナ22aを結合される。こうして、ヘツドライ
ナ16とピストンライナ22aとの間にセラミツクスに
より囲まれた断熱性の高い主室17が区画される。図示
してないが、シリンダヘツド25は主室17へ連通する
吸気路に吸気弁を、排気路に排気弁をそれぞれ配設され
るのは、普通のデイーゼルエンジンと同様である。DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a gas engine has a metal cylinder body 19 fitted with a cylinder liner 20 preferably made of ceramics, while a metal cylinder head 25 has a lower cylindrical portion 25a made of ceramics. A reverse cup type headliner 16 is fitted, a cylinder head 25 is connected to the upper end of a cylinder body 19, and a piston 22 is fitted to the cylinder liner 20 and the headliner 16. Preferably, the piston 22 has a crowned piston liner 22a made of ceramics. Thus, the main chamber 17 surrounded by the ceramics and having a high heat insulating property is defined between the head liner 16 and the piston liner 22a. Although not shown, in the cylinder head 25, an intake valve is provided in an intake passage communicating with the main chamber 17, and an exhaust valve is provided in an exhaust passage, as in a normal diesel engine.
【0009】ガス燃料の圧縮着火を得るために、シリン
ダヘツド25の内部に副室15が備えられる。副室15
はセラミツクス製のカツプ状体14からなり、ヘツドラ
イナ16と一体的に形成されるのが好ましい。副室15
と主室17とは連絡孔15bにより連通され、連絡孔1
5bは副室弁18により開閉される。副室弁18の弁ス
テム18aは副室15を貫通し、シリンダヘツド25に
支持した案内筒8に昇降可能に支持される。シリンダヘ
ツド25の上端壁と弁ステム18aの上端に結合したタ
ペツト2との間に介装したばね3により、副室弁18は
連絡孔15bの下端の弁座へ当接される。タペツト2が
ピストン22の往復動に関連して回転するカム(図示せ
ず)により押し下げられると、副室弁18は連絡孔15
bを開く。副室15の壁部に配設した燃料供給弁4は、
ピストン22の往復動に関連して、燃料槽のガス燃料を
燃料供給管7を経て副室15へ噴出する。A sub-chamber 15 is provided inside the cylinder head 25 in order to obtain compression ignition of gas fuel. Sub-chamber 15
Is composed of a ceramic cup 14 and is preferably formed integrally with a headliner 16. Sub-chamber 15
The main chamber 17 and the main chamber 17 are communicated with each other by a communication hole 15b.
The sub chamber valve 18 opens and closes 5b. The valve stem 18a of the sub chamber valve 18 penetrates the sub chamber 15 and is supported by the guide cylinder 8 supported by the cylinder head 25 so as to be able to move up and down. The sub chamber valve 18 is brought into contact with the valve seat at the lower end of the communication hole 15b by the spring 3 interposed between the upper end wall of the cylinder head 25 and the tapette 2 connected to the upper end of the valve stem 18a. When the tapette 2 is pushed down by a cam (not shown) that rotates in association with the reciprocating movement of the piston 22, the sub chamber valve 18 is connected to the communication hole 15
Open b. The fuel supply valve 4 arranged on the wall of the sub chamber 15 is
In association with the reciprocating movement of the piston 22, the gas fuel in the fuel tank is jetted into the sub chamber 15 via the fuel supply pipe 7.
【0010】図2に示すように、副室弁18の弁ステム
18aはシリンダヘツド25の副室15よりも上方部分
に嵌合支持した案内筒8に嵌挿される。案内筒8の上端
部に装着される筒形のシール手段Aは、ゴムなどからな
る弾性シール30と、弾性シール30を案内筒8の上端
部へ係止する逆カツプ形の捕縛筒34とから構成され
る。弾性シール30は捕縛筒34の端壁34aよりも上
方へ突出する突出部30aに、弁ステム18aに常時接
する主リツプ30bを形成され、捕縛筒34で覆われる
中間部に、通常は弁ステム18aに当接しない複数の副
リツプ30cを形成される。突出部30aの外周部に断
面半円形の環状溝40が備えられ、環状溝40に係合し
た金属製の弾性環31の縮閉力により主リツプ30bは
弁ステム18aへ押し付けられる。As shown in FIG. 2, the valve stem 18a of the sub-chamber valve 18 is fitted and inserted in the guide cylinder 8 which is fitted and supported in a portion above the sub-chamber 15 of the cylinder head 25. The tubular sealing means A attached to the upper end of the guide tube 8 is composed of an elastic seal 30 made of rubber or the like, and an inverted cup-shaped catch tube 34 that locks the elastic seal 30 to the upper end of the guide tube 8. Composed. The elastic seal 30 is formed with a main lip 30b that is in constant contact with the valve stem 18a on a protruding portion 30a that protrudes above the end wall 34a of the catch tube 34. Is formed with a plurality of sub-lips 30c that do not abut. An annular groove 40 having a semicircular cross section is provided on the outer peripheral portion of the protrusion 30a, and the main lip 30b is pressed against the valve stem 18a by the contracting force of the metal elastic ring 31 engaged with the annular groove 40.
【0011】弾性シール30の中間部に、上方へ開口す
る多数の断面扇形の溝35が周方向等間隔に配設され
る。各溝35に複数の圧電素子36を重ね合せてなるア
クチユエータBが収容され、溝35は捕縛筒34の端壁
34aにより閉鎖される。弾性シール30は下半部を案
内筒8に外嵌される。弾性シール30の軸方向移動を抑
えるために、案内筒8の外周壁に形成した環状溝8a
に、弾性シール30の突条30dが係合され、かつ捕縛
筒34により押えられる。In the middle portion of the elastic seal 30, a large number of fan-shaped grooves 35 having an upward opening are arranged at equal intervals in the circumferential direction. An actuator B formed by stacking a plurality of piezoelectric elements 36 is housed in each groove 35, and the groove 35 is closed by the end wall 34 a of the catching cylinder 34. The elastic seal 30 has a lower half portion fitted on the guide cylinder 8. An annular groove 8a formed in the outer peripheral wall of the guide cylinder 8 in order to suppress the axial movement of the elastic seal 30.
The ridge 30d of the elastic seal 30 is engaged with and is pressed by the catching cylinder 34.
【0012】図3,4に示すように、板状の圧電素子3
6は径方向に重ね合され、外側と内側との圧電素子36
にそれぞれ導線37,38が接続され、電子制御装置4
4の出力端子へ接続される。電子制御装置44はエンジ
ンの回転数センサ41と、燃料噴射時期センサ42と、
ピストン22の上死点を検出する上死点センサ43との
各信号に基づき、アクチユエータBの圧電素子36へ加
える電圧と時期を制御する。As shown in FIGS. 3 and 4, a plate-shaped piezoelectric element 3
6 are radially overlapped, and the piezoelectric elements 36 on the outside and the inside
Lead wires 37 and 38 are connected to the electronic control unit 4
4 is connected to the output terminal. The electronic control unit 44 includes an engine speed sensor 41, a fuel injection timing sensor 42,
Based on each signal from the top dead center sensor 43 that detects the top dead center of the piston 22, the voltage and timing applied to the piezoelectric element 36 of the actuator B are controlled.
【0013】図5に示すように、ガスエンジンの吸気
弁、排気弁、副室弁18、燃料供給弁4の各弁は、ピス
トン22の往復動に関連して開閉する。吸気行程の始期
に副室弁18が閉じると、燃料供給弁4が開き、ガス燃
料が燃料供給弁4から副室15へ供給される。一方、主
室17へ吸い込まれた吸気は、圧縮行程で圧縮されて高
温になり、圧縮行程の終期に燃料供給弁4が閉じ、副室
弁18が開くと、高温の吸気は連絡孔15bを経て副室
15へ噴出し、ガス燃料と混合してガス燃料を着火させ
る。副室15で着火したガス燃料と吸気の混合気は、膨
張行程で連絡孔15bを経てシリンダの主室17へ流
れ、燃焼しつつピストン22に爆発荷重を及ぼし、ピス
トン22を往動させる。As shown in FIG. 5, the intake valve, the exhaust valve, the auxiliary chamber valve 18, and the fuel supply valve 4 of the gas engine open and close in association with the reciprocating movement of the piston 22. When the sub chamber valve 18 is closed at the beginning of the intake stroke, the fuel supply valve 4 is opened and the gas fuel is supplied from the fuel supply valve 4 to the sub chamber 15. On the other hand, the intake air sucked into the main chamber 17 is compressed to a high temperature in the compression stroke, the fuel supply valve 4 is closed at the end of the compression stroke, and the auxiliary chamber valve 18 is opened. After that, it is jetted into the sub chamber 15 and mixed with the gas fuel to ignite the gas fuel. The mixture of gas fuel and intake air ignited in the sub chamber 15 flows into the main chamber 17 of the cylinder through the communication hole 15b in the expansion stroke, and while burning, exerts an explosive load on the piston 22 and causes the piston 22 to move forward.
【0014】アクチユエータBの圧電素子36は図5に
線61で示すように吸気行程の始期に電圧V1を印加さ
れ、図5に線62に示すように圧縮行程の中期に高い電
圧V2を印加され、膨張行程の終期に電圧を0に戻され
る。アクチユエータBの圧電素子36は印加電圧に比例
して全体として収縮し、副リツプ30cを弁ステム18
aへ押し付ける(図4)。The piezoelectric element 36 of the actuator B is applied with a voltage V1 at the beginning of the intake stroke as shown by the line 61 in FIG. 5 and with a high voltage V2 at the middle of the compression stroke as shown by the line 62 in FIG. , At the end of the expansion stroke, the voltage is returned to 0. The piezoelectric element 36 of the actuator B contracts as a whole in proportion to the applied voltage, so that the auxiliary lip 30c is connected to the valve stem 18 and
Press on a (Fig. 4).
【0015】副リツプ30cの緊迫力は副室15の内部
の圧力が高くなる圧縮行程の終期から膨張行程の終期ま
で大きくなり、副室15の燃焼ガスが弁ステム18aの
摺動部を経て外部へ洩れるのを抑止する。一方、副室1
5の内部の圧力が低い排気行程では、アクチユエータB
の押付力は解放され、副リツプ30cが弁ステム18a
から離れ(図2)、主リツプ30bだけが弁ステム18
aに当接する。この時、潤滑油が案内筒8と弁ステム1
8aとの隙間へ補給されるので、潤滑油が不足すること
はない。The tightening force of the sub-lip 30c increases from the end of the compression stroke where the pressure inside the sub-chamber 15 increases to the end of the expansion stroke, and the combustion gas in the sub-chamber 15 passes through the sliding portion of the valve stem 18a to the outside. To prevent leakage. On the other hand, sub-chamber 1
In the exhaust stroke where the internal pressure of 5 is low, the actuator B
The pressing force of the valve stem 18a is released and the auxiliary lip 30c is released.
Away (FIG. 2), only the main lip 30b is the valve stem 18
Contact a. At this time, the lubricating oil is used in the guide cylinder 8 and the valve stem 1.
Since it is replenished to the gap with 8a, there is no shortage of lubricating oil.
【0016】[0016]
【発明の効果】本発明は上述のように、シリンダヘツド
の内部にセラミツクからなる副室を配設し、該副室へ天
然ガス燃料を供給する燃料供給装置を備え、シリンダの
主室と副室を結ぶ連絡孔にこれを開閉する副室弁を設け
たガスエンジンにおいて、シリンダヘツドの案内筒に摺
動可能に支持した副室弁の弁ステムに弾性シールを外挿
し、弾性シールの内部に弾性シールを外周側から弁ステ
ムへ押し付けるアクチユエータを備え、アクチユエータ
の押付力を副室の内部圧力に対応して制御する押付力制
御手段を備えたものであるから、エンジンのサイクルご
とに副室の内部圧力に対応する電圧が圧電素子へ印加さ
れ、電圧に対応する弾性シールの緊迫力が弁ステムに作
用する。弾性シールの緊迫力はエンジンのサイクルごと
に変化するので、副室弁の開閉動作に伴う弁ステムの摺
動による摩擦損失が減じられ、また副室弁案内部への潤
滑油の流入が改善され、油不足が回避される。As described above, the present invention is provided with a sub chamber made of ceramic inside the cylinder head and provided with a fuel supply device for supplying natural gas fuel to the sub chamber. In a gas engine equipped with a sub-chamber valve that opens and closes a communication hole that connects the chambers, an elastic seal is externally inserted into the valve stem of the sub-chamber valve slidably supported by the guide tube of the cylinder head, and It is equipped with an actuator that presses the elastic seal against the valve stem from the outer peripheral side, and is equipped with a pressing force control means that controls the pressing force of the actuator in accordance with the internal pressure of the sub chamber. A voltage corresponding to the internal pressure is applied to the piezoelectric element, and the elastic sealing force corresponding to the voltage acts on the valve stem. Since the elastic seal tension changes with each engine cycle, friction loss due to sliding of the valve stem associated with opening and closing of the auxiliary chamber valve is reduced, and the flow of lubricating oil into the auxiliary chamber valve guide is improved. , Oil shortage is avoided.
【図1】本発明に係る副室弁案内部のシール構造を備え
たガスエンジンの正面断面図である。FIG. 1 is a front sectional view of a gas engine provided with a seal structure for a sub-chamber valve guide portion according to the present invention.
【図2】同副室弁案内部のシール構造を示す正面断面図
である。FIG. 2 is a front sectional view showing a seal structure of the sub chamber valve guide portion.
【図3】同副室弁案内部のシール構造を示す平面断面図
である。FIG. 3 is a plan sectional view showing a seal structure of the sub chamber valve guide portion.
【図4】同副室弁案内部のシール構造の押付力制御手段
を示す正面断面図である。FIG. 4 is a front sectional view showing a pressing force control means of the seal structure of the sub chamber valve guide portion.
【図5】本発明に係るガスエンジンの行程を表す線図で
ある。FIG. 5 is a diagram showing the stroke of the gas engine according to the present invention.
【図6】従来の副室弁案内部のシール構造を示す正面断
面図である。FIG. 6 is a front sectional view showing a conventional seal structure for a sub chamber valve guide portion.
A:シール手段 B:アクチユエータ 4:燃料供給弁
7:燃料供給管 8:案内筒 15:副室 15b:
連絡孔 16:ヘツドライナ 17:主室 18:副室
弁 18a:弁テム 19:シリンダ本体 20:シリ
ンダライナ 22:ピストン 25:シリンダヘツド
30:弾性シール 30b:主リツプ 30c:副リツ
プ 30d:突条 31:弾性環 34:捕縛筒 34
a:端壁 35:溝 36:圧電素子 41:回転数センサ 4
2:燃料噴射時期センサ 43:上死点センサ 44:電子制御装置 45:電源A: Sealing means B: Actuator 4: Fuel supply valve 7: Fuel supply pipe 8: Guide cylinder 15: Sub chamber 15b:
Communication hole 16: Headliner 17: Main chamber 18: Sub chamber valve 18a: Valve tem 19: Cylinder body 20: Cylinder liner 22: Piston 25: Cylinder head
30: Elastic seal 30b: Main lip 30c: Sub-lip 30d: Projection 31: Elastic ring 34: Captive tube 34
a: end wall 35: groove 36: piezoelectric element 41: rotation speed sensor 4
2: Fuel injection timing sensor 43: Top dead center sensor 44: Electronic control device 45: Power supply
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 F02F 11/00 P F02M 21/02 H01L 41/09 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location F02F 11/00 P F02M 21/02 H01L 41/09
Claims (3)
る副室を配設し、該副室へ天然ガス燃料を供給する燃料
供給装置を備え、シリンダの主室と副室を結ぶ連絡孔に
これを開閉する副室弁を設けたガスエンジンにおいて、
シリンダヘツドの案内筒に摺動可能に支持した副室弁の
弁ステムに弾性シールを外挿し、弾性シールの内部に弾
性シールを外周側から弁ステムへ押し付けるアクチユエ
ータを備え、アクチユエータの押付力を副室の内部圧力
に対応して制御する押付力制御手段を備えたことを特徴
とする、ガスエンジンにおける副室弁案内部のシール構
造。1. A sub-chamber made of ceramic is provided inside a cylinder head, and a fuel supply device for supplying natural gas fuel to the sub-chamber is provided. The sub-chamber is provided in a communication hole connecting the main chamber and the sub-chamber of the cylinder. In a gas engine equipped with a sub chamber valve that opens and closes,
An elastic seal is externally inserted on the valve stem of the auxiliary chamber valve that is slidably supported by the guide tube of the cylinder head, and the inside of the elastic seal is equipped with an actuator that presses the elastic seal from the outer peripheral side to the valve stem. A seal structure for a sub-chamber valve guide portion in a gas engine, comprising a pressing force control means for controlling in accordance with an internal pressure of the chamber.
請求項1に記載のガスエンジンにおける副室弁案内部の
シール構造。2. The actuator comprises a piezoelectric element,
The seal structure of the sub chamber valve guide part in the gas engine according to claim 1.
号に基づき、副室での1次燃焼と主室での2次燃焼が行
われている期間に、前記圧電素子へ印加する電圧を制御
する制御装置を備えた、請求項2に記載のガスエンジン
における副室弁案内部のシール構造。3. A voltage applied to the piezoelectric element is controlled based on a signal from a sensor that senses an operating state of an engine, during a period in which primary combustion in a sub chamber and secondary combustion in a main chamber are performed. The seal structure for the auxiliary chamber valve guide portion in the gas engine according to claim 2, further comprising a control device for controlling the auxiliary chamber valve guide portion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6289118A JPH08121127A (en) | 1994-10-28 | 1994-10-28 | Sealing structure for auxiliary chamber valve guide section in gas engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6289118A JPH08121127A (en) | 1994-10-28 | 1994-10-28 | Sealing structure for auxiliary chamber valve guide section in gas engine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08121127A true JPH08121127A (en) | 1996-05-14 |
Family
ID=17739014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6289118A Pending JPH08121127A (en) | 1994-10-28 | 1994-10-28 | Sealing structure for auxiliary chamber valve guide section in gas engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08121127A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008039026A (en) * | 2006-08-04 | 2008-02-21 | Nok Corp | Valve stem seal |
JP2012042059A (en) * | 2011-11-14 | 2012-03-01 | Kyb Co Ltd | Shock absorber |
US11549466B2 (en) | 2019-02-18 | 2023-01-10 | Caterpillar Energy Solutions Gmbh | Seal and method for a fuel gas supply to a pre-combustion chamber |
-
1994
- 1994-10-28 JP JP6289118A patent/JPH08121127A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008039026A (en) * | 2006-08-04 | 2008-02-21 | Nok Corp | Valve stem seal |
JP2012042059A (en) * | 2011-11-14 | 2012-03-01 | Kyb Co Ltd | Shock absorber |
US11549466B2 (en) | 2019-02-18 | 2023-01-10 | Caterpillar Energy Solutions Gmbh | Seal and method for a fuel gas supply to a pre-combustion chamber |
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