JPH0226700B2 - - Google Patents

Info

Publication number
JPH0226700B2
JPH0226700B2 JP58164232A JP16423283A JPH0226700B2 JP H0226700 B2 JPH0226700 B2 JP H0226700B2 JP 58164232 A JP58164232 A JP 58164232A JP 16423283 A JP16423283 A JP 16423283A JP H0226700 B2 JPH0226700 B2 JP H0226700B2
Authority
JP
Japan
Prior art keywords
port
cylinder liner
scavenging
width
opening
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.)
Expired - Lifetime
Application number
JP58164232A
Other languages
Japanese (ja)
Other versions
JPS6056120A (en
Inventor
Osamu Motomura
Sukeyuki Wakatsuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP58164232A priority Critical patent/JPS6056120A/en
Publication of JPS6056120A publication Critical patent/JPS6056120A/en
Publication of JPH0226700B2 publication Critical patent/JPH0226700B2/ja
Granted legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
    • 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
    • F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

【発明の詳細な説明】 本発明はユニフロー掃気式２サイクルデイーゼ
ル機関のシリンダライナに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder liner for a uniflow scavenging two-stroke diesel engine.

第１図はシリンダライナの掃気、排気の方式を
示し、Ａはユニフロー掃気式、Ｂはループ掃気
式、Ｃはクロス掃気式を示す。第２図はシリンダ
ライナの１例を示す軸線方向の断面図、第３図は
従来の掃気ポートの形状を示す断面図である。 FIG. 1 shows the scavenging and exhausting systems of the cylinder liner, where A shows the uniflow scavenging type, B shows the loop scavenging type, and C shows the cross scavenging type. FIG. 2 is an axial cross-sectional view showing an example of a cylinder liner, and FIG. 3 is a cross-sectional view showing the shape of a conventional scavenging port.

舶用デイーゼル機関のユニフロー形機関のシリ
ンダライナの下部に設けられた掃気ポート形状に
関して、スワール効果を大ならしむるため、第３
図に示すような上部と下部で異つた角度の流入角
を与えるスキユードポートアレンジが提案されて
いる。 Regarding the shape of the scavenging port provided at the bottom of the cylinder liner of the uniflow type marine diesel engine, in order to increase the swirl effect, the third
A skewed port arrangement has been proposed that provides different inflow angles at the top and bottom, as shown in the figure.

この場合は、流入角がすべて同一のとき、第１
図Ａに示す様に、燃焼後の排気ガスが、シリンダ
ライナ壁面やシリンダライナ中心部に残留し、掃
気効率が低くなる。そこで、かかる従来のもの
は、異つた角度の流入角を与え、シリンダライナ
壁面や中心部へも掃気を吹き込み、残留する排気
ガスを押し出し、掃気効率を上げている。 In this case, when all inflow angles are the same, the first
As shown in Figure A, the exhaust gas after combustion remains on the cylinder liner wall surface and the center of the cylinder liner, resulting in low scavenging efficiency. Therefore, in such conventional systems, different inlet angles are provided, scavenging air is blown into the cylinder liner wall surface and center, and the remaining exhaust gas is pushed out to improve the scavenging efficiency.

第３図及び第４図に示すような従来のスキユー
ドポートにおいて、ポート３を構成する各円形ポ
ートの内径ｄを上部、中部、下部で同一にした場
合（d1＝d2＝d3）には、ポート３出口の開口巾ａ
がa1＜a2＜a3と違つてくる。特に流入スワール角
θ3が大きい上部ではシリンダライナ１の内面の残
り肉厚（以下リブと称する）４の巾b3が狭くな
り、またポート３の開口巾出口a3が広いため、ピ
ストンリングがポート３の開口巾を通過する際、
ポート内部へはみ出し、ピストンリングの摺動性
能や折損に対する強度面で不利となる。また、場
合によつては、リブ４の断面積が減少するため強
度低下の問題がある。 In the conventional skewed port as shown in FIGS. 3 and 4, when the inner diameter d of each circular port constituting port 3 is made the same at the top, middle, and bottom (d 1 = d 2 = d 3 ) is the opening width a of port 3 outlet.
becomes different from a 1 < a 2 < a 3 . Particularly in the upper part where the inflow swirl angle θ 3 is large, the width b 3 of the remaining wall thickness (hereinafter referred to as ribs) 4 on the inner surface of the cylinder liner 1 is narrow, and the opening width a 3 of the port 3 is wide, so the piston ring When passing through the opening width of port 3,
It protrudes into the port, which is disadvantageous in terms of piston ring sliding performance and strength against breakage. Furthermore, in some cases, the cross-sectional area of the ribs 4 is reduced, resulting in a problem of reduced strength.

本発明の目的は上記欠点を排除し、ポートアレ
ンジの加工形状を最も効率のよい形状とすること
であり、その特徴とするところは、掃気ポートを
スキユードポートに形成したユニフロー掃気式２
サイクルデイーゼル機関のシリンダライナにおい
て、上記掃気ポートは、複数段の円形ポートをシ
リンダライナの上部側のポートのスワール角がそ
れよりも下部のスワール角よりも大きくなるよう
に、該シリンダライナの軸線方向に連設して形成
されるとともに、各円形ポートのシリンダライナ
内周側開口部の円周方向幅が等しく、かつ上記各
開口部の中心線がシリンダライナの軸心線に平行
に形成されたことである。 The purpose of the present invention is to eliminate the above-mentioned drawbacks and to make the processing shape of the port arrangement into the most efficient shape.The feature is that the scavenging port is a uniflow scavenging type 2 in which the scavenging port is formed as a skewed port.
In the cylinder liner of a cycle diesel engine, the scavenging ports are arranged in a plurality of stages in the axial direction of the cylinder liner such that the swirl angle of the port on the upper side of the cylinder liner is larger than the swirl angle of the port on the lower side. The openings on the inner peripheral side of the cylinder liner of each circular port have the same width in the circumferential direction, and the center line of each opening is parallel to the axis of the cylinder liner. That's true.

即ち、ポート出口の開口巾を上部も中部も下部
も同一とし、ドリルの直径を変えてポートを形成
し、シリンダライナ内面における各ポートの開口
中心をシリンダライナの軸線と平行にしたことで
ある。 That is, the opening width of the port outlet is the same in the upper, middle, and lower parts, the diameter of the drill is changed to form the ports, and the opening center of each port on the inner surface of the cylinder liner is made parallel to the axis of the cylinder liner.

以下図面を参照して本発明による実施例につき
説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第５図は本発明による１実施例のポート形状の
上、中、下部の断面図を示し、第６図はポートの
シリンダライナ内面及び外面形状を示す。 FIG. 5 shows a top, middle, and bottom sectional view of the port shape of an embodiment of the present invention, and FIG. 6 shows the inner and outer shapes of the cylinder liner of the port.

図において、ポート３の内周面への開口巾ａを
上部巾a3、中部巾a2、下部巾a1とするとき、ポー
ト３の内径ｄをスワール角θ1，θ2，θ3の大きさに
反比例してd1＞d2＞d3と小さくするようにして、
ポート３の開口巾ａをa1＝a2＝a3にすると共に、
特に上部ポートにおいてリブ４の巾を広くするも
のである。ここで開口巾ａは、ピストンリングの
摺動性能や折損に対する強度面で不利とならぬ範
囲で、必要なポート面積も確保する為、同一巾と
する。また、第６図に示すように、ポート３のシ
リンダライナ内面への開口部の中心線はシリンダ
ライナの軸線と平行になるように構成する。 In the figure, when the opening width a of the port 3 to the inner circumferential surface is the upper width a 3 , the middle width a 2 , and the lower width a 1 , the inner diameter d of the port 3 is the swirl angle θ 1 , θ 2 , θ 3 Make it smaller in inverse proportion to the size, d 1 > d 2 > d 3 ,
The opening width a of port 3 is set to a 1 = a 2 = a 3 , and
In particular, the width of the rib 4 is made wider at the upper port. Here, the opening width a is set to be the same width in order to ensure the necessary port area while not being disadvantageous in terms of the piston ring's sliding performance and strength against breakage. Further, as shown in FIG. 6, the center line of the opening of the port 3 to the inner surface of the cylinder liner is configured to be parallel to the axis of the cylinder liner.

上記構成の場合の作用について述べる。 The operation in the case of the above configuration will be described.

ポート３の開口巾ａをa3＝a2＝a1として、ポー
ト３の内径ｄをスワール角θに従つて小さくする
ことにより（即ち、d1＝a1cosθ1、d2＝a2cosθ2、
d3＝a3cosθ3であり、ここにa1＝a2＝a3の条件を
代入し、θ1≒3°で、cosθ1＝0.998、θ2≒20°で、
cosθ2＝0.939、θ3≒35°で、cosθ3＝0.819となり、
d1＞d2＞d3となる。）、リブ４がポート３の上部及
び中部でそれぞれ大きくなり、ピストンリングの
摺動性能や折損に対する強度を向上させることが
できる。 By setting the opening width a of the port 3 to a 3 = a 2 = a 1 and decreasing the inner diameter d of the port 3 according to the swirl angle θ (i.e., d 1 = a 1 cos θ 1 , d 2 = a 2 cos θ 2 ,
d 3 = a 3 cosθ 3 , and substituting the conditions a 1 = a 2 = a 3 here, θ 1 ≒ 3°, cos θ 1 = 0.998, θ 2 ≒ 20°,
cosθ 2 = 0.939, θ 3 ≒ 35°, cosθ 3 = 0.819,
d 1 > d 2 > d 3 . ), the ribs 4 are enlarged at the upper and middle portions of the port 3, and the sliding performance of the piston ring and the strength against breakage can be improved.

ポート３の加工はドリルの直径d′を変化させる
ことにより捩れ角度をもつた形状でも、ポートの
開口巾はa3＝a2＝a1となる。 The opening width of the port 3 will be a 3 = a 2 = a 1 even if the port 3 is formed into a shape with a twist angle by changing the diameter d' of the drill.

上述の場合には次の効果がある。 The above case has the following effects.

リブ４をポート３の中部及び上部でそれぞれ大
きくし、ピストンリングの摺動性能や折損に対す
る強度が増大する。 The ribs 4 are made larger at the middle and upper portions of the port 3, increasing the sliding performance of the piston ring and the strength against breakage.

【図面の簡単な説明】[Brief explanation of drawings]

第１図Ａはユニフロー掃気式、Ｂはループ掃気
式、Ｃはクロス掃気式機関の１例を示す説明図、
第２図は従来のシリンダライナの１例を示す軸線
方向の断面図、第３図は従来の掃気ポートの形状
を示すシリンダライナの軸線に直角方向の断面
図、第４図は従来のシリンダライナにおける掃気
ポートの内側開口部の形状を示す説明図、第５図
は本発明の実施例における掃気ポートの形状を示
すシリンダライナの軸線に直角方向の断面図、第
６図は本発明の実施例における掃気ポートのシリ
ンダライナ内側開口部の形状を示す説明図であ
る。 １……シリンダライナ、３……ポート、a1，
a2，a3……内面の開口巾。 FIG. 1A is an explanatory diagram showing an example of a uniflow scavenging type engine, B is a loop scavenging type engine, and C is an example of a cross scavenging type engine.
Fig. 2 is an axial cross-sectional view showing an example of a conventional cylinder liner, Fig. 3 is a cross-sectional view perpendicular to the axis of the cylinder liner showing the shape of a conventional scavenging port, and Fig. 4 is a conventional cylinder liner. FIG. 5 is a cross-sectional view taken perpendicular to the axis of the cylinder liner and shows the shape of the scavenging port in an embodiment of the present invention. FIG. 6 is an embodiment of the present invention. FIG. 3 is an explanatory diagram showing the shape of the cylinder liner inner opening of the scavenging port in FIG. 1... Cylinder liner, 3... Port, a 1 ,
a 2 , a 3 ... Inner opening width.

Claims (1)

【特許請求の範囲】[Claims] １ 掃気ポートをスキユードポートに形成したユ
ニフロー掃気式２サイクルデイーゼル機関のシリ
ンダライナにおいて、上記掃気ポートは、複数段
の円形ポートをシリンダライナの上部側のポート
のスワール角がそれよりも下部のスワール角より
も大きくなるように、該シリンダライナの軸線方
向に連設して形成されるとともに、各円形ポート
のシリンダライナ内周側開口部の円周方向幅が等
しく、かつ上記各開口部の中心線がシリンダライ
ナの軸心線に平行に形成されたことを特徴とする
シリンダライナ。1. In the cylinder liner of a uniflow scavenging type two-stroke diesel engine in which the scavenging port is formed as a skewed port, the scavenging port is a multi-stage circular port in which the swirl angle of the upper port of the cylinder liner is smaller than that of the lower swirl. The circular ports are formed so as to be continuous in the axial direction of the cylinder liner so as to be larger than the angles, and the openings on the inner peripheral side of the cylinder liner of each circular port have the same circumferential width, and the center of each opening A cylinder liner characterized in that a line is formed parallel to an axis of the cylinder liner.
JP58164232A 1983-09-08 1983-09-08 Cylinder liner Granted JPS6056120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58164232A JPS6056120A (en) 1983-09-08 1983-09-08 Cylinder liner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58164232A JPS6056120A (en) 1983-09-08 1983-09-08 Cylinder liner

Publications (2)

Publication Number Publication Date
JPS6056120A JPS6056120A (en) 1985-04-01
JPH0226700B2 true JPH0226700B2 (en) 1990-06-12

Family

ID=15789179

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58164232A Granted JPS6056120A (en) 1983-09-08 1983-09-08 Cylinder liner

Country Status (1)

Country Link
JP (1) JPS6056120A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016068128A1 (en) * 2014-10-30 2016-05-06 株式会社Ihi Uniflow scavenging two-cycle engine
JP2016089642A (en) * 2014-10-30 2016-05-23 株式会社Ihi Uniflow scavenging two-cycle engine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56151238A (en) * 1980-04-24 1981-11-24 Yamaha Motor Co Ltd Shape of exhaust port of two-cycle engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56151238A (en) * 1980-04-24 1981-11-24 Yamaha Motor Co Ltd Shape of exhaust port of two-cycle engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016068128A1 (en) * 2014-10-30 2016-05-06 株式会社Ihi Uniflow scavenging two-cycle engine
JP2016089642A (en) * 2014-10-30 2016-05-23 株式会社Ihi Uniflow scavenging two-cycle engine
US10371042B2 (en) 2014-10-30 2019-08-06 Ihi Corporation Uniflow scavenging two-cycle engine

Also Published As

Publication number Publication date
JPS6056120A (en) 1985-04-01

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