JPH06288210A - Exhaust valve hydraulic drive device of large two cycle engine - Google Patents
Exhaust valve hydraulic drive device of large two cycle engineInfo
- Publication number
- JPH06288210A JPH06288210A JP5094933A JP9493393A JPH06288210A JP H06288210 A JPH06288210 A JP H06288210A JP 5094933 A JP5094933 A JP 5094933A JP 9493393 A JP9493393 A JP 9493393A JP H06288210 A JPH06288210 A JP H06288210A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust valve
- hydraulic
- cycle engine
- cylinder
- hydraulic drive
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34446—Fluid accumulators for the feeding circuit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Landscapes
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は大形２サイクルエンジン
の排気弁油圧駆動装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust valve hydraulic drive system for a large two-cycle engine.
【０００２】[0002]
【従来の技術】図３は大形２サイクルエンジンの油圧駆
動式排気弁装置の従来例を示す。図において１は架台、
２はシリンダライナ、３はピストン、４はシリンダヘッ
ド、５は排気弁ケーシング、６は排気弁、７はエアシリ
ンダ、８はエアピストン、９は排気弁６とエアピストン
８を固定するコマ、１０は油圧シリンダ、１１はプラン
ジャである。油圧駆動装置部は次の部材から構成されて
いる。１２はカム軸台、１３はカム、１４はローラ、１
５は摺動筒、１６はばね、１７は油圧ポンプ本体で該本
体にはプランジャ１８と逆止弁１９が組み込まれてい
る。２０は油圧管で油圧ポンプ本体１７と油圧シリンダ
１０を連結している。2. Description of the Related Art FIG. 3 shows a conventional example of a hydraulically driven exhaust valve device for a large two-cycle engine. In the figure, 1 is a mount,
2 is a cylinder liner, 3 is a piston, 4 is a cylinder head, 5 is an exhaust valve casing, 6 is an exhaust valve, 7 is an air cylinder, 8 is an air piston, 9 is a top for fixing the exhaust valve 6 and the air piston 8, and 10 Is a hydraulic cylinder, and 11 is a plunger. The hydraulic drive unit is composed of the following members. 12 is a cam headstock, 13 is a cam, 14 is a roller, 1
5 is a sliding cylinder, 16 is a spring, 17 is a hydraulic pump main body, in which a plunger 18 and a check valve 19 are incorporated. A hydraulic pipe 20 connects the hydraulic pump body 17 and the hydraulic cylinder 10.
【０００３】次に前記従来例の作用について説明する。
図示しないエンジン下部のクランク軸からクランクメカ
ニズムを介して駆動されるピストン３はシリンダライナ
２内を上下運動すると共に、排気弁油圧駆動装置部のカ
ム１３はまた前記クランク軸と同期して回転駆動され
る。該カム１３が回転するとカムに接しているローラ１
４、摺動筒１５が順次上昇し、該摺動筒１５に接続して
いる油圧ポンプ本体１７のプランジャ１８も上昇する。Next, the operation of the conventional example will be described.
A piston 3 driven from a crankshaft (not shown) under the engine through a crank mechanism moves up and down in the cylinder liner 2, and a cam 13 of an exhaust valve hydraulic drive unit is also rotationally driven in synchronization with the crankshaft. It When the cam 13 rotates, the roller 1 in contact with the cam
4. The sliding cylinder 15 sequentially rises, and the plunger 18 of the hydraulic pump body 17 connected to the sliding cylinder 15 also rises.
【０００４】このときプランジャ１８は油圧ポンプ本体
１７の逆止弁１９をへて給油されたプランジャ室内のシ
ステム油を圧縮し、該システム油が油圧管２０をへて油
圧シリンダ１０へ圧送されてプランジャ１１を押し下げ
るので、プランジャに連結されて一体化された排気弁６
が開き、シリンダ内の燃焼ガスが排気される。カム１３
の回転がさらに進むと、プランジャ１８が下がり、油圧
管２０のシステム油がプランジャ室に吸い戻され排気弁
１１を閉じる。At this time, the plunger 18 compresses the system oil in the plunger chamber, which has been supplied with oil through the check valve 19 of the hydraulic pump main body 17, and the system oil is sent under pressure through the hydraulic pipe 20 to the hydraulic cylinder 10 to cause the plunger to move. Since 11 is pushed down, the exhaust valve 6 connected to the plunger and integrated
Opens and the combustion gas in the cylinder is exhausted. Cam 13
Further, the plunger 18 is lowered, the system oil of the hydraulic pipe 20 is sucked back into the plunger chamber, and the exhaust valve 11 is closed.
【０００５】[0005]
【発明が解決しようとする課題】ところが前記従来例の
大形２サイクルエンジンでは低回転で低負荷時には高濃
度のＮＯx が排気され公害上の問題となっている。However, in the large-sized two-cycle engine of the conventional example, a high concentration of NO x is exhausted at low speed and low load, which is a problem of pollution.
【０００６】本発明の目的は前記従来例の問題点を解消
し、低速、低負荷時にＮＯx の発生を抑制し、排気ガス
浄化が計られる大形２サイクルエンジンの排気弁油圧駆
動装置を提供するにある。An object of the present invention is to solve the above-mentioned problems of the conventional example, and to provide an exhaust valve hydraulic drive system for a large two-cycle engine capable of suppressing the generation of NO x at low speed and low load and purifying exhaust gas. There is.
【０００７】[0007]
【課題を解決するための手段】本発明に係る大形２サイ
クルエンジンの排気弁油圧駆動装置は排気弁６のアクチ
ュエータである油圧シリンダ１０を駆動する油圧管２０
から分岐し、電磁弁１００を介してピストン１０２、ば
ね１０３を内装したバッファタンク１０１を連結したこ
とを特徴としている。An exhaust valve hydraulic drive system for a large two-cycle engine according to the present invention comprises a hydraulic pipe 20 for driving a hydraulic cylinder 10 which is an actuator of an exhaust valve 6.
It is characterized in that a buffer tank 101 having a piston 102 and a spring 103 therein is connected via a solenoid valve 100.
【０００８】[0008]
【作用】排気弁６の開弁時アクチュエータである油圧シ
リンダ１０を駆動するシステム油が油圧管２０内を流さ
れる際、該システム油の一部をエンジンの負荷状態が入
力された図示しないコントローラを介して開弁し、バッ
ファタンク１０１に充填することにより油圧シリンダ１
０に圧送される量が少なくなって、プランジャ１１の動
きを減少させ、排気弁の開弁期間及び開弁面積を図２の
ように少なくする。これによりシリンダ内燃焼ガスの排
気量が少なくなり、所謂ＥＧＲ燃焼状態となって燃焼温
度が下がり、ＮＯX の発生を抑え排気ガスの浄化が計ら
れる。When the system oil that drives the hydraulic cylinder 10 that is the actuator when the exhaust valve 6 is opened is made to flow through the hydraulic pipe 20, a controller (not shown) in which a part of the system oil is input to the load state of the engine is used. The hydraulic cylinder 1 is opened by opening the valve and filling the buffer tank 101.
The amount of pressure-feeding to 0 is reduced, the movement of the plunger 11 is reduced, and the opening period and opening area of the exhaust valve are reduced as shown in FIG. As a result, the amount of combustion gas in the cylinder is reduced, the so-called EGR combustion state is set, the combustion temperature is lowered, NO X is suppressed, and the exhaust gas is purified.
【０００９】[0009]
【実施例】以下図１〜２を参照し本発明に係る排気弁駆
動装置の一実施例について説明する。図１は実施例の要
部断面図、図２は排気弁の開弁期間と開弁面積を示す図
である。図において１は架台、２はシリンダライナ、３
はピストン、４はシリンダヘッド、５は排気弁ケーシン
グ、６は排気弁、７はエアシリンダ、８はエアピスト
ン、９は排気弁とエアピストン８を固定するコマ、１０
は油圧シリンダ、１１はプランジャである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an exhaust valve drive device according to the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a main part of the embodiment, and FIG. 2 is a diagram showing a valve opening period and a valve opening area of an exhaust valve. In the figure, 1 is a mount, 2 is a cylinder liner, and 3
Is a piston, 4 is a cylinder head, 5 is an exhaust valve casing, 6 is an exhaust valve, 7 is an air cylinder, 8 is an air piston, 9 is a top fixing the exhaust valve and the air piston 8.
Is a hydraulic cylinder, and 11 is a plunger.
【００１０】油圧駆動装置部は次の部材から構成されて
いる。１２はカム軸台、１３はカム、１４はローラ、１
５は摺動筒、１６はばね、１７は油圧ポンプ本体でプラ
ンジャ１８と逆止弁１９が組み込まれている。２０は油
圧管で油圧ポンプ本体１７と油圧シリンダ１０を接続し
ている。これらの部材構成及び作用は前述した従来例と
同様である。The hydraulic drive unit is composed of the following members. 12 is a cam headstock, 13 is a cam, 14 is a roller, 1
Reference numeral 5 is a sliding cylinder, 16 is a spring, and 17 is a hydraulic pump main body in which a plunger 18 and a check valve 19 are incorporated. A hydraulic pipe 20 connects the hydraulic pump body 17 and the hydraulic cylinder 10. The structure and operation of these members are the same as those of the conventional example described above.
【００１１】次に本発明の要部であるバッファタンク１
０１及び電磁弁１００について説明する。図１において
１００は電磁弁、１０１はバッファタンクで内部にはピ
ストン１０２及びばね１０３が組み込まれている。１０
１ａはバッファタンク１０１のばね１０３室の底部に設
けた穴、１０４は接続管で油圧管２０より分岐して電磁
弁１００とバッファタンク１０１を直列に連結してい
る。Next, the buffer tank 1 which is an essential part of the present invention
01 and the solenoid valve 100 will be described. In FIG. 1, reference numeral 100 is a solenoid valve, 101 is a buffer tank in which a piston 102 and a spring 103 are incorporated. 10
1a is a hole provided at the bottom of the spring 103 chamber of the buffer tank 101, and 104 is a connecting pipe that branches from the hydraulic pipe 20 to connect the solenoid valve 100 and the buffer tank 101 in series.
【００１２】次に本発明に係る油圧式排気弁駆動装置の
作用について説明する。油圧管２０から分岐して設けら
れている電磁弁１００を開くと、油圧ポンプ本体１７か
ら圧送されるシステム油が接続管１０４を通してバッフ
ァタンク１００に流れ、バッファタンク１０１内のピス
トン１０２、ばね１０３を押圧してシステム油がバッフ
ァタンク１０１内に充填される。Next, the operation of the hydraulic exhaust valve drive system according to the present invention will be described. When the solenoid valve 100 branched from the hydraulic pipe 20 is opened, the system oil pumped from the hydraulic pump main body 17 flows into the buffer tank 100 through the connection pipe 104, and the piston 102 and the spring 103 in the buffer tank 101 are closed. When pressed, the system oil is filled in the buffer tank 101.
【００１３】この際ピストン１０２の裏側のばね室内で
圧縮される空気は１０１ａの穴より抜け出してピストン
１０２の外周より洩れたシステム油とともにシステム油
タンクへ戻される。上記のようにして圧送されるシステ
ム油の一部がバッファタンク１０１に充填されるため、
油圧シリンダ１０に圧送されるシステム油量が減少して
プランジャ１１を押し下げる量が少なくなると同時に下
がり始める時期が変化する。このため、排気弁６の開弁
期間及び開弁面積が図２の実線で示すように少なくな
る。なお電磁弁１００は低速、低負荷域（特に舶用エン
ジンの場合は入出港時）で作動するように構成されてい
る。At this time, the air compressed in the spring chamber on the back side of the piston 102 escapes from the hole 101a and is returned to the system oil tank together with the system oil leaking from the outer periphery of the piston 102. Since part of the system oil pumped as described above is filled in the buffer tank 101,
The amount of system oil that is pressure-fed to the hydraulic cylinder 10 decreases, and the amount by which the plunger 11 is pushed down decreases. Therefore, the valve opening period and the valve opening area of the exhaust valve 6 are reduced as shown by the solid line in FIG. It should be noted that the solenoid valve 100 is configured to operate in a low speed, low load region (especially when entering and leaving a port in the case of a marine engine).
【００１４】[0014]
【発明の効果】本発明に係る大形２サイクルエンジンの
排気弁油圧駆動装置は前記のとおり構成したので、低
速、低負荷時に排気弁の開弁期間及び開弁面積が図２の
ように減少し、シリンダ内の燃焼ガスをシリンダ内によ
り多く残留させてシリンダ内の酸素濃度の低下をはか
り、燃焼を緩慢にしてＮＯX の発生を抑え排気ガスの浄
化をはかる。Since the exhaust valve hydraulic drive system for a large two-cycle engine according to the present invention is configured as described above, the valve opening period and valve opening area of the exhaust valve are reduced as shown in FIG. 2 at low speed and low load. and, measure the decrease in the oxygen concentration in the cylinder a combustion gas in the cylinder is residual number by the cylinder, to suppress the occurrence of the NO X in the slow combustion promote purification of exhaust gas.
【図１】本発明の第１実施例に係る要部断面図FIG. 1 is a sectional view of an essential part according to a first embodiment of the present invention.
【図２】排気弁の開弁期間及び開弁面積図FIG. 2 is a diagram showing the opening period and opening area of the exhaust valve.
【図３】従来装置の図１応当図FIG. 3 is a diagram of FIG. 1 of a conventional device.
１…架台、２…シリンダライナ、３…ピストン、４…シ
リンダヘッド、５…排気弁ケーシング、６…排気弁、７
…エアシリンダ、８…エアピストン、９…コマ、１０…
油圧シリンダ、１１…プランジャ、１２…カム軸台、１
３…カム、１４…ローラ、１５…摺動筒、１６…ばね、
１７…油圧ポンプ本体、１８…プランジャ、１９…逆止
弁、２０…油圧管、１００…電磁弁、１０１…バッファ
タンク、１０２…ピストン、１０３…ばね、１０４…接
続管。1 ... Stand, 2 ... Cylinder liner, 3 ... Piston, 4 ... Cylinder head, 5 ... Exhaust valve casing, 6 ... Exhaust valve, 7
… Air cylinder, 8… Air piston, 9… Top, 10…
Hydraulic cylinder, 11 ... Plunger, 12 ... Cam headstock, 1
3 ... Cam, 14 ... Roller, 15 ... Sliding cylinder, 16 ... Spring,
17 ... Hydraulic pump main body, 18 ... Plunger, 19 ... Check valve, 20 ... Hydraulic pipe, 100 ... Electromagnetic valve, 101 ... Buffer tank, 102 ... Piston, 103 ... Spring, 104 ... Connection pipe.
Claims (1)
動装置において、排気弁（６）のアクチュエータである
油圧シリンダ（１０）を駆動する油圧管（２０）から分
岐し、電磁弁（１００）を介してピストン（１０２）、
ばね（１０３）を内装したバッファタンク（１０１）を
連結したことを特徴とする大形２サイクルエンジンの排
気弁油圧駆動装置。1. In an exhaust valve hydraulic drive system for a large two-cycle engine, a solenoid valve (100) is branched from a hydraulic pipe (20) that drives a hydraulic cylinder (10) that is an actuator of the exhaust valve (6). Through the piston (102),
An exhaust valve hydraulic drive system for a large two-cycle engine, characterized in that a buffer tank (101) containing a spring (103) is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5094933A JPH06288210A (en) | 1993-03-31 | 1993-03-31 | Exhaust valve hydraulic drive device of large two cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5094933A JPH06288210A (en) | 1993-03-31 | 1993-03-31 | Exhaust valve hydraulic drive device of large two cycle engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06288210A true JPH06288210A (en) | 1994-10-11 |
Family
ID=14123767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5094933A Pending JPH06288210A (en) | 1993-03-31 | 1993-03-31 | Exhaust valve hydraulic drive device of large two cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06288210A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009144725A (en) * | 2009-02-04 | 2009-07-02 | Man Diesel Filial Af Man Diesel Se Tyskland | Cam-drive exhaust valve operation system for large-sized two-cycle diesel engine |
| JP2010106843A (en) * | 2009-12-17 | 2010-05-13 | Man Diesel Filial Af Man Diesel Se Tyskland | Cam drive exhaust valve operating system for large-sized two-cycle diesel engine |
| KR100963666B1 (en) * | 2008-02-27 | 2010-06-15 | 맨 디젤 필리얼 아프 맨 디젤 에스이, 티스크랜드 | Variable valve timing for a large two-stroke diesel engine with a camshaft |
| WO2012057310A1 (en) * | 2010-10-28 | 2012-05-03 | 株式会社Ihi | Two-stroke engine |
| KR20160060751A (en) | 2014-01-10 | 2016-05-30 | 미츠비시 쥬고교 가부시키가이샤 | Exhaust-valve drive device and internal combustion engine provided with same |
-
1993
- 1993-03-31 JP JP5094933A patent/JPH06288210A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100963666B1 (en) * | 2008-02-27 | 2010-06-15 | 맨 디젤 필리얼 아프 맨 디젤 에스이, 티스크랜드 | Variable valve timing for a large two-stroke diesel engine with a camshaft |
| JP2009144725A (en) * | 2009-02-04 | 2009-07-02 | Man Diesel Filial Af Man Diesel Se Tyskland | Cam-drive exhaust valve operation system for large-sized two-cycle diesel engine |
| JP2010106843A (en) * | 2009-12-17 | 2010-05-13 | Man Diesel Filial Af Man Diesel Se Tyskland | Cam drive exhaust valve operating system for large-sized two-cycle diesel engine |
| WO2012057310A1 (en) * | 2010-10-28 | 2012-05-03 | 株式会社Ihi | Two-stroke engine |
| JP5452730B2 (en) * | 2010-10-28 | 2014-03-26 | 株式会社Ｉｈｉ | 2-stroke engine |
| JP2014058984A (en) * | 2010-10-28 | 2014-04-03 | Ihi Corp | Two-stroke engine |
| KR20160060751A (en) | 2014-01-10 | 2016-05-30 | 미츠비시 쥬고교 가부시키가이샤 | Exhaust-valve drive device and internal combustion engine provided with same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20030225 |