JP2007064054A - Two-cycle multi-cylinder internal combustion engine - Google Patents

Two-cycle multi-cylinder internal combustion engine Download PDF

Info

Publication number
JP2007064054A
JP2007064054A JP2005249160A JP2005249160A JP2007064054A JP 2007064054 A JP2007064054 A JP 2007064054A JP 2005249160 A JP2005249160 A JP 2005249160A JP 2005249160 A JP2005249160 A JP 2005249160A JP 2007064054 A JP2007064054 A JP 2007064054A
Authority
JP
Japan
Prior art keywords
scavenging
cylinder
inlet
oil
crankshaft
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
Application number
JP2005249160A
Other languages
Japanese (ja)
Inventor
Naohito Hori
尚人 堀
Ichiro Fujimura
一郎 藤村
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.)
Daihatsu Motor Co Ltd
Original Assignee
Daihatsu Motor Co 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 Daihatsu Motor Co Ltd filed Critical Daihatsu Motor Co Ltd
Priority to JP2005249160A priority Critical patent/JP2007064054A/en
Priority to PCT/JP2006/317400 priority patent/WO2007026910A1/en
Publication of JP2007064054A publication Critical patent/JP2007064054A/en
Pending legal-status Critical Current

Links

Images

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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0002—Cylinder arrangements
    • F02F7/0007—Crankcases of engines with cylinders in line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • 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
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
    • F02B25/04—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
    • 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
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/14—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke
    • F02B25/16—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke the charge flowing upward essentially along cylinder wall opposite the inlet ports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • F01M2011/023—Arrangements of lubricant conduits between oil sump and cylinder head
    • 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

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a size or weight of a two-cycle multi-cylinder internal combustion engine, which is constituted in such a way that a plurality of cylinders 4 are arranged on a cylinder block 2 which has a cylinder head 2 and an oil pan 3, scavenge ports 7 are formed on each cylinder to communicate with the inside of the cylinder at a plurality of portions in a circumferential direction, scavenge chambers to each scavenge port of the cylinder and a scavenge inlet 15 to the scavenge chambers are disposed, and a transmission case 11 for output and a retainer 13 supporting an oil seal 12 with respect to a crankshaft are joined with one end face 1a on an output side of the cylinder block. <P>SOLUTION: Two scavenge chambers 8, 9 extend in a direction of the crankshaft on right and left sides of each cylinder row. On the other hand, the scavenge inlet 15 is formed at one end part of the cylinder block, and is branched to communicate with the scavenge chambers. In the cylinder block, a passage 16 for dropping the oil from the cylinder head is formed in the inside of the branched parts from the scavenge inlet to the scavenge chambers. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は，二サイクル式内燃機関のうち，複数のシリンダを備えて成る二サイクル式多気筒内燃機関に関するものである。   The present invention relates to a two-cycle multi-cylinder internal combustion engine comprising a plurality of cylinders among two-cycle internal combustion engines.

先行技術としての特許文献１には，複数のシリンダを備えて成る二サイクル式多気筒内燃機関が記載されている。   Patent Document 1 as a prior art describes a two-cycle multi-cylinder internal combustion engine having a plurality of cylinders.

この二サイクル式多気筒内燃機関は，シリンダブロックに，複数のシリンダを，クランク軸方向に並べて配設し，このシリンダの各々に，当該シリンダ内への掃気ポートを円周方向の複数箇所に設ける一方，前記シリンダブロックには，掃気ポンプにて圧縮された吸気（掃気）を，前記各シリンダにおける掃気ポートの各々に分配するための掃気室を，前記各シリンダの全周を囲うように設けて成るという構成である。   In this two-cycle multi-cylinder internal combustion engine, a plurality of cylinders are arranged side by side in the crankshaft direction in a cylinder block, and scavenging ports into the cylinders are provided at a plurality of circumferential positions in each of the cylinders. On the other hand, the cylinder block is provided with a scavenging chamber for distributing the intake air (scavenging) compressed by the scavenging pump to each of the scavenging ports in each cylinder so as to surround the entire circumference of each cylinder. It is the composition that consists of.

しかも，この二サイクル式多気筒内燃機関においては，前記シリンダブロックにおけるクランク軸線と平行な左右両長手側面のうち一方の長手側面に，前記掃気ポンプから前記掃気室への掃気入口を設けるという構成にしている。
特開２００３−５６３４２号公報 Moreover, in this two-cycle multi-cylinder internal combustion engine, a scavenging inlet from the scavenging pump to the scavenging chamber is provided on one of the left and right long side surfaces parallel to the crank axis in the cylinder block. ing.
JP 2003-56342 A

前記先行技術の二サイクル式多気筒内燃機関においては，前記したように，シリンダブロックにおけるクランク軸線と平行な左右両長手側面のうち一方の長手側面に，掃気ポンプから前記掃気室への一つの掃気入口を設けるという構成であることにより，前記掃気入口からの吸気（掃気）を，各シリンダにおける全ての掃気ポートに対して均等に分配するためには，前記掃気室のうち一方の長手側面における掃気入口から流入した吸気が，前記掃気室内の全体に行き渡らせるように構成しなければならず，そのためには，前記掃気室における内容積を，相当に大きくしなければならないから，前記掃気室の大型化を招来する。   In the prior art two-cycle multi-cylinder internal combustion engine, as described above, one scavenging from the scavenging pump to the scavenging chamber is provided on one of the left and right longitudinal sides parallel to the crank axis in the cylinder block. In order to evenly distribute the intake air (scavenging) from the scavenging inlet to all the scavenging ports in each cylinder, the scavenging in one longitudinal side surface of the scavenging chamber is provided. The intake air flowing in from the inlet must be configured to spread throughout the scavenging chamber. To that end, the internal volume of the scavenging chamber must be considerably increased. Invites

これに加えて，前記シリンダブロックの頂部におけるシリンダヘッドにおける潤滑油を当該シリンダブロックの底部におけるオイルパンに導くために前記シリンダブロックに設けられるオイル落とし通路を，当該オイル落とし通路が前記掃気室内における吸気の流れを損なうことがないように，前記掃気室の外側に配設するように構成しなければならない。   In addition, an oil drop passage provided in the cylinder block for guiding the lubricating oil in the cylinder head at the top of the cylinder block to an oil pan at the bottom of the cylinder block, the oil drop passage being an intake air in the scavenging chamber. It must be arranged outside the scavenging chamber so as not to impair the flow of air.

つまり，前記先行技術の構成では，前記掃気室の大型化を招来することに加えて，この掃気室の外側にオイル落とし通路を配設することのためにシリンダブロックの大型化，ひいては，内燃機関の全体の大型化及び重量のアップを招来するという問題があった。   That is, in the configuration of the prior art, in addition to inviting an increase in the size of the scavenging chamber, a cylinder block is increased in size because an oil dropping passage is provided outside the scavenging chamber, and thus the internal combustion engine. There has been a problem of inviting an increase in overall size and weight.

本発明は，この問題を解消した二サイクルの多気筒内燃機関を提供することを技術的課題とするものである。   An object of the present invention is to provide a two-cycle multi-cylinder internal combustion engine that solves this problem.

この技術的課題を達成するため本発明の請求項１は，
「頂部にシリンダヘッドを底部にオイルパンを備えたシリンダブロックに，複数のシリンダを，クランク軸方向に並べて配設し，このシリンダの各々に，当該シリンダ内への掃気ポートを円周方向の複数箇所に設け，更に，前記シリンダブロックに，前記各シリンダにおける各掃気ポートへの掃気室と，掃気ポンプからの吸気を前記掃気室に導入する掃気入口とを設け，前記シリンダブロックにおけるクランク軸方向の両端面のうち出力側の一端面に，出力用ミッションケースを接合するとともに，この出力側の一端面のうち前記出力用ミッションケース内の部分に，前記クランク軸に対するオイルシールを支持したリテーナを接合して成る二サイクル式多気筒内燃機関において，
前記掃気室を，前記各シリンダにおける列の左右両側をクランク軸方向に延びる二つの掃気室に形成する一方，前記掃気入口を，前記シリンダブロックにおけるクランク軸線方向の両端部のうち前記ミッションケース側の端部に設けて，この掃気入口を分岐して前記両掃気室に連通し，更に，前記シリンダブロックのうち前記掃気入口から両掃気室への分岐部の内側に，前記シリンダヘッドからのオイル落とし通路を配設し，このオイル落とし通路の下端を，前記ミッションケース内に位置し，この下端を，前記リテーナにクランク軸を迂回するように設けたオイル通路を介して前記オイルパンに連通する。」
ことを特徴としている。 In order to achieve this technical problem, claim 1 of the present invention provides:
“A cylinder block with a cylinder head at the top and an oil pan at the bottom has a plurality of cylinders arranged side by side in the direction of the crankshaft. Each of these cylinders has a plurality of scavenging ports in the circumferential direction. The cylinder block is further provided with a scavenging chamber to each scavenging port in each cylinder and a scavenging inlet for introducing the intake air from the scavenging pump into the scavenging chamber. An output mission case is joined to one end face on the output side of both end faces, and a retainer that supports an oil seal for the crankshaft is joined to a portion in the output mission case on one end face on the output side. In a two-cycle multi-cylinder internal combustion engine consisting of
The scavenging chamber is formed in two scavenging chambers extending in the crankshaft direction on both the left and right sides of the row in each cylinder, while the scavenging inlet is formed on the transmission case side of both ends of the cylinder block in the crankshaft direction. The scavenging inlet is branched to communicate with the scavenging chambers, and further, oil is dropped from the cylinder head inside the branching portion of the cylinder block from the scavenging inlet to the scavenging chambers. A passage is provided, and the lower end of the oil dropping passage is located in the transmission case, and the lower end communicates with the oil pan through an oil passage provided in the retainer so as to bypass the crankshaft. "
It is characterized by that.

また，本発明の請求項２は，
「前記請求項１の記載において，前記掃気入口を，前記シリンダブロックにおける出力側の一端面のうち前記ミッションケースの上部の部分に，当該一端面から突出するように一体に設ける。」
ことを特徴としている。 Further, claim 2 of the present invention is
“In the first aspect of the present invention, the scavenging inlet is integrally provided at an output upper end portion of the cylinder block at an upper portion of the transmission case so as to protrude from the one end surface.”
It is characterized by that.

この構成において，掃気ポンプからの吸気（掃気）は，先ず, 掃気入口に至り，この掃気入口から両掃気室に分岐して分配され，次いで，シリンダ列の左右両側をクランク軸方向に延びる両掃気室に向かって分岐し，この両掃気室内をクランク軸方向に流れることにより，各シリンダにおける各掃気ポートの各々に分配される。   In this configuration, the intake air (scavenging) from the scavenging pump first reaches the scavenging inlet, and is branched and distributed from the scavenging inlet to both scavenging chambers, and then both scavenging air extending in the crankshaft direction on both the left and right sides of the cylinder row. By branching toward the chambers and flowing in both scavenging chambers in the direction of the crankshaft, they are distributed to each scavenging port in each cylinder.

一方，前記シリンダヘッドにおける潤滑油は，シリンダブロックに設けたオイル落とし通路からリテーナに設けたオイル通路を介してオイルパンに戻される。   On the other hand, the lubricating oil in the cylinder head is returned from the oil dropping passage provided in the cylinder block to the oil pan through the oil passage provided in the retainer.

この場合において，各シリンダにおける各掃気ポートに対する掃気室を，各シリンダにおける列の左右両側をクランク軸方向に延びる二つの掃気室に形成する一方，前記掃気入口を，前記シリンダブロックにおけるクランク軸線方向の両端部のうち一方の端部に設けて，この掃気入口を分岐して前記両掃気室に連通するという構成にしたことにより，一つの掃気入口からの吸気を，各シリンダにおける各掃気ポートに，シリンダ列の方向に延びる二つの掃気室を介して均等に分配することができるから，掃気室における内容積を，前記先行技術の場合よりも縮小することができる。   In this case, a scavenging chamber for each scavenging port in each cylinder is formed as two scavenging chambers extending in the crankshaft direction on both the left and right sides of the row in each cylinder, while the scavenging inlet is formed in the crankshaft direction in the cylinder block. Provided at one end of both ends, this scavenging inlet is branched to communicate with both scavenging chambers, so that intake air from one scavenging inlet is sent to each scavenging port in each cylinder. Since the gas can be distributed evenly through two scavenging chambers extending in the direction of the cylinder row, the internal volume in the scavenging chamber can be reduced as compared with the prior art.

これに加えて，シリンダヘッドからのオイル落とし通路を，前記掃気入口から両掃気室への分岐部の内側に配設したことにより，前記分岐部の内側における空間をオイル落とし通路の形成に利用できるから，前記掃気室における内容積の縮小と相俟って，シリンダブロックの小型・軽量化，ひいては，内燃機関の全体における小型・軽量化を図ることができる。   In addition, the oil drop passage from the cylinder head is arranged inside the branch portion from the scavenging inlet to both scavenging chambers, so that the space inside the branch portion can be used for forming the oil drop passage. Therefore, in combination with the reduction of the internal volume in the scavenging chamber, the cylinder block can be reduced in size and weight, and as a result, the entire internal combustion engine can be reduced in size and weight.

その一方で，前記オイル落とし通路の下端を，前記ミッションケース内に位置し，この下端を，前記リテーナにクランク軸を迂回するように設けたオイル通路を介して前記オイルパンに連通したことにより，前記シリンダブロックにおける出力側の端面のうち前記ミッションケースを接合する部分にオイル落とし通路を開口することを回避できるから，シリンダヘッドにおける潤滑油をクランク軸を迂回しながらオイルパンに戻すように構成することのために，前記出力用ミッションケースのシリンダブロックに対する接合部における強度が低下することを確実に阻止できる。   On the other hand, the lower end of the oil drop passage is located in the transmission case, and the lower end communicates with the oil pan through an oil passage provided in the retainer so as to bypass the crankshaft. Since it is possible to avoid opening an oil dropping passage in a portion of the output side end face of the cylinder block where the transmission case is joined, the lubricating oil in the cylinder head is returned to the oil pan while bypassing the crankshaft. For this reason, it is possible to reliably prevent the strength at the joint portion of the output transmission case with respect to the cylinder block from being lowered.

特に，請求項２に記載したように，掃気入口を，シリンダブロックにおける出力側の一端面のうちミッションケースの上部の部分に，当該一端面から突出するように一体に設けたことにより，前記掃気入口を，クランク軸方向に対して，ミッションケースとオーバーラップすることができるから，これだけ内燃機関の小型化を図ることができる。   In particular, as described in claim 2, the scavenging inlet is integrally provided at a portion of the output side of the cylinder block at an upper portion of the transmission case so as to protrude from the one end surface. Since the inlet can overlap with the transmission case in the crankshaft direction, the internal combustion engine can be reduced in size.

以下，本発明の実施の形態を，二つの気筒を備えたユニフロー型の二サイクル式内燃機関に適用した場合を示す図１〜図４の図面について説明する。   1 to 4 showing a case where an embodiment of the present invention is applied to a uniflow type two-cycle internal combustion engine having two cylinders.

これらの図において，符号１は，シリンダブロックを示し，このシリンダブロック１には，その上面にシリンダヘッド２が，その下面にオイルパン３が各々接合されている。   In these drawings, reference numeral 1 denotes a cylinder block, and a cylinder head 2 is joined to the upper surface of the cylinder block 1 and an oil pan 3 is joined to the lower surface thereof.

シリンダブロック１における内部には，二つのシリンダ４がクランク軸５の軸線方向に並べて設けられ，この各シリンダ４には，前記クランク軸５の回転に連動して往復動するピストン６を内蔵しており，更に，前記各シリンダ４には，その内部におけるピストン６の往復動によって開閉するようにした掃気ポート７が，円周方向の複数箇所に設けられている。   Inside the cylinder block 1, two cylinders 4 are arranged side by side in the axial direction of the crankshaft 5, and each cylinder 4 has a piston 6 that reciprocates in conjunction with the rotation of the crankshaft 5. Further, each cylinder 4 is provided with scavenging ports 7 which are opened and closed by reciprocating movement of the piston 6 in the cylinder 4 at a plurality of locations in the circumferential direction.

また，前記シリンダブロック１における内部には，前記各シリンダ４における列の左右両側をクランク軸５の方向に延びる二つの掃気室８，９が形成されているほか，冷却水ジャケット１０が，前記各シリンダ４の周囲を囲うように形成されている。   Further, in the cylinder block 1, two scavenging chambers 8 and 9 extending in the direction of the crankshaft 5 are formed on the left and right sides of the row in each cylinder 4, and a cooling water jacket 10 is provided for each of the above. It is formed so as to surround the periphery of the cylinder 4.

前記シリンダブロック１におけるクランク軸５の方向の左右両端面のうち出力側の端面１ａには，出力用ミッション（図示ぜす）を内蔵したミッションケース１１が締結されているほか，この出力側の端面１ａのうち前記ミッションケース１１内の部分には，前記クランク軸５に被嵌したオイルシール１２を支持するリテーナ１３が接合されている。   A transmission case 11 having a built-in output mission (shown) is fastened to the output side end face 1a of the left and right end faces in the direction of the crankshaft 5 in the cylinder block 1, and the output side end face A retainer 13 that supports an oil seal 12 fitted to the crankshaft 5 is joined to a portion of the transmission case 11 in the la.

そして，前記シリンダブロック１における出力側の端面１ａのうち前記ミッションケース１１より上方の部分には，入口ヘッダー１４を，端面１ａから突出するように一体に設けて，この入口ヘッダー１４の上面に，図示しない掃気ポンプからの掃気入口１５を設け，前記入口ヘッダー１４を，図３の平面視に示すように，前記両掃気室８，９のうち一方の掃気室８へ連通路１４ａと，他方の掃気室９への連通路１４ｂとに二股状に分岐する。   An inlet header 14 is integrally provided on the output block end surface 1a of the cylinder block 1 above the transmission case 11 so as to protrude from the end surface 1a. A scavenging inlet 15 from a scavenging pump (not shown) is provided, and the inlet header 14 is connected to one of the scavenging chambers 8 and 9, as shown in a plan view of FIG. It branches into a bifurcated shape into the communication passage 14b to the scavenging chamber 9.

前記シリンダブロック１のうち前記入口ヘッダー１４から両連通路１４ａ，１４ｂに分岐する部分の内側に，前記シリンダヘッド２の上面における動弁機構室（図示せず）からの潤滑油のオイル落とし通路１６を，上下方向に延びるように成形して，その下端１６ａを，前記ミッションケース１１内に位置する一方，前記リテーナ１３には，前記クランク軸５を迂回するように延びるオイル通路１７を設けて，前記オイル落とし通路１６を，このオイル通路１７を介して前記オイルパン３内に連通するように構成する。   An oil dropping passage 16 for lubricating oil from a valve mechanism chamber (not shown) on the upper surface of the cylinder head 2 is provided inside a portion of the cylinder block 1 that branches from the inlet header 14 to both communication passages 14a and 14b. The lower end 16a is located in the transmission case 11, while the retainer 13 is provided with an oil passage 17 extending so as to bypass the crankshaft 5, The oil drop passage 16 is configured to communicate with the oil pan 3 through the oil passage 17.

この構成において，掃気ポンプからの吸気（掃気）は，先ず, 掃気入口１５から入口ヘッダー１４内に至り，次いで，シリンダ列の左右両側をクランク軸方向に延びる両掃気室８，９に向かって分岐し，この両掃気室８，９内をクランク軸方向に流れることにより，各シリンダ４における各掃気ポート７の各々に分配される。   In this configuration, intake air (scavenging) from the scavenging pump first reaches the inlet header 14 from the scavenging inlet 15, and then branches to both scavenging chambers 8 and 9 extending in the crankshaft direction on both the left and right sides of the cylinder row. The scavenging chambers 8 and 9 are distributed to the scavenging ports 7 in each cylinder 4 by flowing in the crankshaft direction.

一方，前シリンダヘッド２における動弁機構内の潤滑油は，シリンダブロック１に設けたオイル落とし通路１６からリテーナ１３に設けたオイル通路１７を介してオイルパン３に戻される。   On the other hand, the lubricating oil in the valve mechanism in the front cylinder head 2 is returned from the oil dropping passage 16 provided in the cylinder block 1 to the oil pan 3 through the oil passage 17 provided in the retainer 13.

この場合において，各シリンダ４における各掃気ポート７に対する掃気室を，各シリンダにおける列の左右両側をクランク軸方向に延びる二つの掃気室８，９に形成する一方，前記掃気入口１５を，前記シリンダブロック１におけるクランク軸線方向の両端部のうち一方の端部に設けて，この掃気入口１５を分岐して前記両掃気室８，９に連通するという構成にしたことにより，一つの掃気入口１５からの吸気を，各シリンダ４における各掃気ポート７に，シリンダ列の方向に延びる二つの掃気室８，９を介して均等に分配することができる。   In this case, a scavenging chamber for each scavenging port 7 in each cylinder 4 is formed in two scavenging chambers 8 and 9 extending in the crankshaft direction on both the left and right sides of the row in each cylinder, while the scavenging inlet 15 is formed in the cylinder. The scavenging inlet 15 is provided at one end of the crank axial direction in the block 1, and the scavenging inlet 15 is branched to communicate with the scavenging chambers 8 and 9. Can be evenly distributed to each scavenging port 7 in each cylinder 4 through two scavenging chambers 8 and 9 extending in the direction of the cylinder row.

また，シリンダヘッド２における動弁機構室からのオイル落とし通路１６を，前記掃気入口１５から両掃気室８，９への分岐部の内側に配設したことにより，前記分岐部の内側における無駄な空間をオイル落とし通路１６の形成に利用できる。   Further, the oil drop passage 16 from the valve mechanism chamber in the cylinder head 2 is disposed inside the branch portion from the scavenging inlet 15 to both the scavenging chambers 8 and 9, so that the waste inside the branch portion is eliminated. The space can be used to form the oil dropping passage 16.

更にまた，前記オイル落とし通路１６の下端１６ａを，前記ミッションケース１１内に位置し，この下端１６ａを，前記リテーナ１３にクランク軸５を迂回するように設けたオイル通路１７を介して前記オイルパン３に連通したことにより，前記シリンダブロック１における出力側の端面１ａのうち前記ミッションケース１１の接合する部分にオイル落とし通路を開口することを回避することができる。   Furthermore, a lower end 16a of the oil dropping passage 16 is located in the transmission case 11, and the lower end 16a is provided in the oil pan 17 through an oil passage 17 provided in the retainer 13 so as to bypass the crankshaft 5. 3, it is possible to avoid opening an oil dropping passage in a portion of the output side end face 1 a of the cylinder block 1 where the transmission case 11 is joined.

加えて，掃気入口１５を備えた入口ヘッダー１４を，シリンダブロック１における出力側の一端面１ａのうちミッションケース１１の上部の部分に，当該一端面１ａから突出するように一体に設けたことにより，前記掃気入口１５を備えた入口ヘッダー１４を，クランク軸方向に対して，ミッションケース１１とオーバーラップすることができる。   In addition, the inlet header 14 provided with the scavenging inlet 15 is integrally provided on the output side end face 1a of the cylinder block 1 at the upper part of the transmission case 11 so as to protrude from the end face 1a. The inlet header 14 having the scavenging inlet 15 can overlap the transmission case 11 in the crankshaft direction.

本発明の実施の形態による内燃機関を示す一部切欠側面図である。1 is a partially cutaway side view showing an internal combustion engine according to an embodiment of the present invention. 図１のII−II視断面図である。It is the II-II sectional view taken on the line of FIG. 図１のIII −III 視断面図である。FIG. 3 is a sectional view taken along line III-III in FIG. 1. 図１のIV−IV視断面図である。FIG. 4 is a sectional view taken along line IV-IV in FIG. 1.

符号の説明Explanation of symbols

１ シリンダブロック
２ シリンダヘッド
３ オイルパン
４ シリンダ
５ クランク軸
６ ピストン
７ 掃気ポート
８，９ 掃気室
１０ 冷却水ジャケット
１１ ミッションケース
１２ オイルシール
１３ リテーナ
１４ 入口ヘッダー
１４ａ，１４ｂ 連通路
１５ 掃気入口 １６ オイル落とし通路
１７ オイル通路 DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Cylinder head 3 Oil pan 4 Cylinder 5 Crankshaft 6 Piston 7 Scavenging port 8, 9 Scavenging chamber 10 Cooling water jacket 11 Mission case 12 Oil seal 13 Retainer 14 Inlet header 14a, 14b Communication path 15 Scavenging inlet 16 Oil drop Passage 17 oil passage

Claims (2)

頂部にシリンダヘッドを底部にオイルパンを備えたシリンダブロックに，複数のシリンダを，クランク軸方向に並べて配設し，このシリンダの各々に，当該シリンダ内への掃気ポートを円周方向の複数箇所に設け，更に，前記シリンダブロックに，前記各シリンダにおける各掃気ポートへの掃気室と，掃気ポンプからの吸気を前記掃気室に導入する掃気入口とを設け，前記シリンダブロックにおけるクランク軸方向の両端面のうち出力側の一端面に，出力用ミッションケースを接合するとともに，この出力側の一端面のうち前記出力用ミッションケース内の部分に，前記クランク軸に対するオイルシールを支持したリテーナを接合して成る二サイクル式多気筒内燃機関において，
前記掃気室を，前記各シリンダにおける列の左右両側をクランク軸方向に延びる二つの掃気室に形成する一方，前記掃気入口を，前記シリンダブロックにおけるクランク軸線方向の両端部のうち前記ミッションケース側の端部に設けて，この掃気入口を分岐して前記両掃気室に連通し，更に，前記シリンダブロックのうち前記掃気入口から両掃気室への分岐部の内側に，前記シリンダヘッドからのオイル落とし通路を配設し，このオイル落とし通路の下端を，前記ミッションケース内に位置し，この下端を，前記リテーナにクランク軸を迂回するように設けたオイル通路を介して前記オイルパンに連通することを特徴とする二サイクル式多気筒内燃機関。 A cylinder block with a cylinder head at the top and an oil pan at the bottom has a plurality of cylinders arranged side by side in the direction of the crankshaft. Each of these cylinders has scavenging ports into the cylinder at multiple locations in the circumferential direction. Further, the cylinder block is provided with a scavenging chamber to each scavenging port in each cylinder and a scavenging inlet for introducing the intake air from the scavenging pump into the scavenging chamber. An output transmission case is joined to one end surface of the output side of the surface, and a retainer that supports an oil seal for the crankshaft is joined to a portion inside the output mission case of one end surface of the output side. In a two-cycle multicylinder internal combustion engine consisting of
The scavenging chamber is formed in two scavenging chambers extending in the crankshaft direction on both the left and right sides of the row in each cylinder, while the scavenging inlet is formed on the transmission case side of both ends of the cylinder block in the crankshaft direction. The scavenging inlet is branched to communicate with the scavenging chambers, and further, oil is dropped from the cylinder head inside the branching portion of the cylinder block from the scavenging inlet to the scavenging chambers. A passage is provided, and the lower end of the oil dropping passage is located in the transmission case, and the lower end communicates with the oil pan through an oil passage provided in the retainer so as to bypass the crankshaft. A two-cycle multi-cylinder internal combustion engine characterized by 前記請求項１の記載において，前記掃気入口を，前記シリンダブロックにおける出力側の一端面のうち前記ミッションケースの上部の部分に，当該一端面から突出するように一体に設けることを特徴とする二サイクル式多気筒内燃機関。   The scavenging inlet according to claim 1, wherein the scavenging inlet is provided integrally with an output side end face of the cylinder block at an upper portion of the transmission case so as to protrude from the end face. Cycle multi-cylinder internal combustion engine.
JP2005249160A 2005-08-30 2005-08-30 Two-cycle multi-cylinder internal combustion engine Pending JP2007064054A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2005249160A JP2007064054A (en) 2005-08-30 2005-08-30 Two-cycle multi-cylinder internal combustion engine
PCT/JP2006/317400 WO2007026910A1 (en) 2005-08-30 2006-08-29 Cylinder block and two-cycle multi-cylinder internal combustion engine with the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005249160A JP2007064054A (en) 2005-08-30 2005-08-30 Two-cycle multi-cylinder internal combustion engine

Publications (1)

Publication Number Publication Date
JP2007064054A true JP2007064054A (en) 2007-03-15

Family

ID=37808994

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005249160A Pending JP2007064054A (en) 2005-08-30 2005-08-30 Two-cycle multi-cylinder internal combustion engine

Country Status (2)

Country Link
JP (1) JP2007064054A (en)
WO (1) WO2007026910A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102979643B (en) * 2012-12-07 2015-11-25 力帆实业(集团)股份有限公司 A kind of crankcase combination reducing machine oil loss
US10253027B2 (en) 2013-07-08 2019-04-09 Bristol-Myers Squibb Company Aryl lactam kinase inhibitors

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06159067A (en) * 1992-11-26 1994-06-07 Mazda Motor Corp Uniflow type two cycle engine
JP3418260B2 (en) * 1994-06-21 2003-06-16 ダイハツ工業株式会社 Scavenging device for two-cycle engine
JP2000282827A (en) * 1999-03-29 2000-10-10 Suzuki Motor Corp Oil passage structure of engine

Also Published As

Publication number Publication date
WO2007026910A1 (en) 2007-03-08

Similar Documents

Publication Publication Date Title
JP4657134B2 (en) Oil passage structure in a 4-cycle air-oil cooled engine
WO2008149061A3 (en) Internal combustion engines
JP6476796B2 (en) Oil passage structure for cooling of multi-cylinder engines
CN107524538B (en) Internal combustion engine
JP5100527B2 (en) Engine oil filter device
JP2017115594A (en) Air-guiding type two-stroke air-cooled engine
US7096843B2 (en) Multicylinder four-cycle combustion engine
JP6623778B2 (en) Cooling structure of internal combustion engine
WO2012137873A1 (en) Cylinder jacket
US7757654B2 (en) Cylinder head
JP2009047110A (en) Internal combustion engine
JP2007064054A (en) Two-cycle multi-cylinder internal combustion engine
JP6888430B2 (en) Engine cooling oil passage structure
CN107035503B (en) Cooling structure of internal combustion engine
JPWO2019066089A1 (en) cylinder head
JP6079405B2 (en) Exhaust gas recirculation device for vehicle engine
JP6601148B2 (en) Engine lubrication structure and motorcycle
JP2017082634A (en) Lubrication structure for engine, and motorcycle
US20060037311A1 (en) Secondary air supply for engine exhaust system
JP2010174776A (en) Multi-cylinder internal combustion engine
KR890000252B1 (en) Breather device in internal combustion engine
US8943797B2 (en) Cylinder head with symmetric intake and exhaust passages
JP2006022777A (en) Internal combustion engine
JP6897347B2 (en) Engine cooling oil passage structure
JP2007283894A (en) Multi-cylinder engine for outboard machine