JPS6380048A - Cylinder in two-cycle engine - Google Patents
Cylinder in two-cycle engineInfo
- Publication number
- JPS6380048A JPS6380048A JP22413586A JP22413586A JPS6380048A JP S6380048 A JPS6380048 A JP S6380048A JP 22413586 A JP22413586 A JP 22413586A JP 22413586 A JP22413586 A JP 22413586A JP S6380048 A JPS6380048 A JP S6380048A
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- cylinder
- scavenging
- press
- cylinder body
- 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.)
- Granted
Links
- 230000002000 scavenging effect Effects 0.000 claims abstract description 32
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- 229910000838 Al alloy Inorganic materials 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 7
- 239000000446 fuel Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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
- 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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、シリンダ本体内にスリーブを配設してなる２
サイクルエンジンのシリンダにおいて、該スリーブの熱
間時における真直度、真円度を改善できるようにした補
強構造に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a cylinder body with a sleeve disposed inside the cylinder body.
The present invention relates to a reinforcing structure capable of improving the straightness and roundness of the sleeve during hot operation in a cycle engine cylinder.
２サイクルエンジン用シリンダには、従来から、アルミ
類のシリンダ本体内に鋳鉄製のスリーブを、圧入により
、又は鋳ぐるみによって配設してなるものがある。この
ようなスリーブ入りアルミシリンダでは、混合気をクラ
ンクケース内からシリンダ上部に導入する掃気通路は、
シリンダ本体に形成された掃気通路用凹部とスリーブの
外表面とで形成されることとなる。2. Description of the Related Art Conventionally, two-cycle engine cylinders include cylinders in which a cast iron sleeve is disposed within an aluminum cylinder body by press-fitting or casting. In such sleeved aluminum cylinders, the scavenging passage that introduces the air-fuel mixture from inside the crankcase to the top of the cylinder is
It is formed by the scavenging passage recess formed in the cylinder body and the outer surface of the sleeve.
上記従来のスリーブ入りアルミシリンダでは、熱間時に
おいてスリーブの掃気通路部分の内径が他の部分より小
さくなり、スリーブ全体の真直度。In the above-mentioned conventional sleeved aluminum cylinder, the inner diameter of the scavenging passage portion of the sleeve becomes smaller than other portions during hot operation, and the straightness of the entire sleeve becomes smaller.
真円度が低下する問題がある。このような問題が生じる
のは主として以下の原因によるものと考えられる。There is a problem that the roundness decreases. The occurrence of such problems is thought to be mainly due to the following causes.
即ち、スリーブ入りアルミシリンダでは、圧入式シリン
ダにあっては所定の圧入圧力でもって、また鋳ぐるみ式
シリンダにあっては所定の凝固圧力でもってスリーブを
半径方向に押圧した状態でシリンダ内に配設している。That is, in the case of an aluminum cylinder with a sleeve, the sleeve is pressed in the radial direction with a predetermined press-fit pressure in the case of a press-fit type cylinder, and with a predetermined solidification pressure in the case of a cast-in type cylinder. It is set up.
ところが上記スリーブの掃気通路部分に作用する圧入圧
力等は、該部分の背面側が空間になっていることから他
の部分より小さくなっている。一方、アルミの熱膨張率
が鋳鉄より大きいことから、熱間時においては、スリー
ブは自身の熱膨張量と、シリンダ本体の熱膨張による圧
入圧力等の解放分による膨張量との和に応じて直径が大
きくなる。しかしながらスリーブの上記掃気通路部分に
ついてはこの解放分による膨張量が他の部分より小さい
から、結局この掃気通路部分は他の部分より相対的に小
径となる。However, the press-fitting pressure, etc. that acts on the scavenging passage portion of the sleeve is smaller than the other portions because the back side of this portion is a space. On the other hand, since the coefficient of thermal expansion of aluminum is higher than that of cast iron, when the sleeve is hot, the sleeve expands according to the sum of its own thermal expansion and the amount of expansion due to the release of press-fit pressure etc. due to thermal expansion of the cylinder body. The diameter becomes larger. However, since the amount of expansion of the scavenging passage portion of the sleeve due to this release is smaller than that of the other portions, this scavenging passage portion has a relatively smaller diameter than the other portions.
なお、上記鋳ぐるみ式シリンダにおいては、従来から、
第６図に示すように、アルミ製シリンダ本体２８の掃気
通路２１部分に、鋳鉄製スリーブ２９の外周方向に延び
、かつスリーブ２９と当接するガイド部２１ａを一体形
成したものがある。In addition, in the above-mentioned cast-in type cylinder, conventionally,
As shown in FIG. 6, a guide portion 21a that extends in the outer circumferential direction of a cast iron sleeve 29 and comes into contact with the sleeve 29 is integrally formed in the scavenging passage 21 portion of the aluminum cylinder body 28.
しかしこのガイド部２１ａは掃気用混合気を所定方向に
流出させるガイド作用を目的としたものであり、またそ
の形状から明らかなように、スリーブ２９に凝固圧力を
作用させる効果はほとんどないから、真円度等の改善効
果は得られない。However, this guide portion 21a is intended to have a guiding function to cause the scavenging air-fuel mixture to flow out in a predetermined direction, and as is clear from its shape, it has almost no effect of applying coagulation pressure to the sleeve 29, so it is not true. The effect of improving roundness etc. cannot be obtained.
また、上記真円度等を改善するには、スリーブの肉厚を
厚くすることが効果的であるが、スリーブを厚（すると
これの冷却性が犠牲にされるので、むやみに厚くするこ
ともできない。In addition, increasing the wall thickness of the sleeve is effective in improving the roundness, etc., but it is also possible to increase the thickness of the sleeve unnecessarily, as this sacrifices the cooling performance of the sleeve. Can not.
そこで本発明の目的は、上記従来の問題点を解決し、ス
リーブの掃気通路部分にも他の部分と同様な圧入圧力等
を作用させることができ、熱間時におけるスリーブの真
円度等を改善できる２サイクルエンジンのシリンダを提
供する点にある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned conventional problems, and to make it possible to apply the same press-fitting pressure to the scavenging passage of the sleeve as to other parts, thereby improving the roundness of the sleeve during hot operation. The object of the present invention is to provide an improved two-stroke engine cylinder.
（問題点を解決するための手段〕
本発明は、２サイクルエンジンのスリーブ入りアルミシ
リンダにおいて、シリンダ本体の掃気通路部分の内面に
、スリーブの外面と押圧状態で当接し、かつスリーブの
軸方向に延びるバックアップ部を一体形成したことを特
徴としている。(Means for Solving the Problems) The present invention provides an aluminum cylinder with a sleeve for a two-stroke engine, which is in contact with the inner surface of the scavenging passage portion of the cylinder body under pressure with the outer surface of the sleeve, and in the axial direction of the sleeve. It is characterized by integrally forming an extending backup part.
本発明に係る２サイクルエンジンのシリンダによれば、
シリンダ本体の掃気通路部分に一体形成されたバックア
ップ部が、スリーブの掃気通路部分に圧入圧力、又は凝
固圧力を作用させるから、該掃気通路部分と他の部分と
で作用する圧力の差が小さくなり、これにより熱間時に
おけるスリーブの直径変化量の場所的偏在が抑制され、
その結果真円度等が改善される。According to the two-stroke engine cylinder according to the present invention,
Since the backup part formed integrally with the scavenging passage of the cylinder body applies press-fit pressure or coagulation pressure to the scavenging passage of the sleeve, the difference in pressure acting between the scavenging passage and other parts is reduced. , This suppresses the uneven distribution of the diameter change of the sleeve during hot heating,
As a result, roundness etc. are improved.
以下、本発明の実施例を図について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図ないし第５図は本発明の一実施例による２サイク
ルエンジンのシリンダを説明するための図である６図に
おいて、１は本実施例シリンダが採用された２サイクル
エンジンであり、これはクランクケース２上に、シリン
ダ３を、これの上面にシリンダへフド４をそれぞれ配置
固定し、またクランクケース２内に回転自在に配設され
たクランク軸５と、シリンダ３内に配設されたピストン
６とをコンロッド７で連結して構成されている。1 to 5 are diagrams for explaining the cylinder of a two-stroke engine according to an embodiment of the present invention. In FIG. 6, 1 is a two-stroke engine in which the cylinder of this embodiment is adopted; A cylinder 3 is arranged and fixed on the crankcase 2, and a cylinder hood 4 is arranged and fixed on the upper surface of the cylinder, and a crankshaft 5 is rotatably arranged inside the crankcase 2, and a cylinder 3 is arranged inside the cylinder 3. It is configured by connecting a piston 6 with a connecting rod 7.
上記シリンダ３は、アルミダイキャスト製のシリンダ本
体８内に鋳鉄製スリーブ９を圧入してなるものである。The cylinder 3 is formed by press-fitting a cast iron sleeve 9 into a cylinder body 8 made of aluminum die-casting.
このシリンダ３には、混合気をクランク室２ａ内に吸引
する吸気通路（図示せず）及び燃焼ガスを排出する排気
通路１０が形成されている。This cylinder 3 is formed with an intake passage (not shown) for sucking the air-fuel mixture into the crank chamber 2a and an exhaust passage 10 for discharging combustion gas.
また、上記シリンダ本体８の排気通路１０と対向する位
置には１つの副掃気通路１２が形成されており、またこ
の副掃気道路１２と排気通路ＩＯとの間には２つの主掃
気通路１１．１１が相互に対向するよう形成されている
。この主、副掃気通路１１．１２はシリンダ本体８の内
面に凹設された掃気凹部１１ａ、１２ａと、スリーブ９
の外表面とで構成され、上記クランク室２ａ内で圧縮さ
れた混合気をスリーブ９の外方を通って該スリーブ９内
の上部に向けて導入するためのものである。Furthermore, one sub-scavenging passage 12 is formed in the cylinder body 8 at a position facing the exhaust passage 10, and two main scavenging passages 11. 11 are formed to face each other. The main and auxiliary scavenging passages 11 and 12 have scavenging recesses 11a and 12a formed in the inner surface of the cylinder body 8, and a sleeve 9.
This is for introducing the air-fuel mixture compressed in the crank chamber 2a through the outside of the sleeve 9 toward the upper part of the inside of the sleeve 9.
そして、上記シリンダ本体８の主、副掃気凹部１１ａ、
１２ａにはバックアップ部１１ｂ、１２ｂが一体形成さ
れている。このバックアップ部１１ｂ、１２ｂは該掃気
通路１１．１２に沿って、即ちスリーブ９の軸方向に延
びるリプ状のものであり、その内側端面はスリーブ９の
外面と所定の圧入圧力でもって当接しており、またその
上端部はスリーブ９の主、副掃気ポー）９ａ、９ｂから
内方を臨んでいる。Main and sub-scavenging recesses 11a of the cylinder body 8,
Backup parts 11b and 12b are integrally formed in 12a. The backup parts 11b and 12b are lip-shaped parts that extend along the scavenging passages 11.12, that is, in the axial direction of the sleeve 9, and their inner end surfaces abut against the outer surface of the sleeve 9 with a predetermined press-fit pressure. Its upper end faces inward from the main and sub-scavenging ports 9a and 9b of the sleeve 9.
次に本実施例の作用効果について説明する。Next, the effects of this embodiment will be explained.
本実施例シリンダ３は、スリーブ９をシリンダ本体８内
に所定の圧力でもって圧入して構成されている。従って
、冷間時においては、スリーブ９はこの圧入圧力に応じ
た分だけその直径が縮小されている。そしてエンジン１
を運転している熱間時においては、アルミの熱膨張係数
が鋳鉄より大きいことから、シリンダ本体８が、スリー
ブ９より大きく膨張することとなり、これによりスリー
ブ９に作用する圧力は上記圧入圧力より小さくなり、そ
の結果スリーブ９は、自身の熱膨張量に上記圧入圧力の
解放による膨張分を加えた分だけ直径が大きくなる。こ
の場合、従来のスリーブ入りアルミシリンダでは、スリ
ーブの掃気通路部分に作用している圧入圧力が他の部分
に比べて極めて小さく、そのため熱間時においても圧入
圧力から解放されることはほとんどなく、その結果真円
度等が低下する問題があった。The cylinder 3 of this embodiment is constructed by press-fitting a sleeve 9 into a cylinder body 8 with a predetermined pressure. Therefore, when the sleeve 9 is cold, its diameter is reduced by an amount corresponding to this press-fitting pressure. and engine 1
During hot operation, the coefficient of thermal expansion of aluminum is larger than that of cast iron, so the cylinder body 8 expands more than the sleeve 9, and as a result, the pressure acting on the sleeve 9 is greater than the press-fit pressure mentioned above. As a result, the diameter of the sleeve 9 increases by an amount equal to the amount of thermal expansion of the sleeve 9 plus the amount of expansion due to the release of the press-fitting pressure. In this case, in conventional sleeved aluminum cylinders, the press-fit pressure acting on the scavenging passage of the sleeve is extremely small compared to other parts, and therefore, even when hot, the press-fit pressure is rarely released. As a result, there was a problem that the roundness etc. deteriorated.
これに対して本実施例では、掃気通路１１，１２にバッ
クアップ部１１ｂ、１２ｂを形成したので、スリーブ９
の掃気通路１１．１２部分はこのバックアップ部１１ｂ
、１２ｂでもって押圧されることとなり、これにより他
の部分に作用している圧力との差はほとんどなくなり、
その結果熱間時には掃気通路１１．１２部分も他の部分
と同様に圧入圧力が解放され、それだけ真円度等を向上
できる。In contrast, in this embodiment, since the backup portions 11b and 12b are formed in the scavenging passages 11 and 12, the sleeve 9
The scavenging passage 11 and 12 portions are this backup part 11b.
, 12b, and as a result, there is almost no difference in pressure from the pressure acting on other parts.
As a result, when it is hot, the press-fitting pressure is released in the scavenging passages 11 and 12 in the same way as in other parts, and the roundness etc. can be improved accordingly.
なお、上記実施例では、バンクアンプ部１１ｂ。Note that in the above embodiment, the bank amplifier section 11b.
１２ｂが掃気ポート９ａ、９ｂ部分まで延設されていた
が、このバックアップ部は必ずしも掃気ボート部分まで
延長する必要はなく、要はスリーブ９の外面と押圧状態
で当接できる長さがあればよい、また、上記実施例では
、圧入式スリーブ入りアルミシリンダについて説明した
が、本発明は鋳ぐるみ式スリーブ入りアルミシリンダに
ついても適用でき、上述と同様の効果が得られる。12b extends to the scavenging ports 9a and 9b, but this backup part does not necessarily need to extend to the scavenging boat part; in short, it only needs to be long enough to come into contact with the outer surface of the sleeve 9 in a pressed state. Furthermore, in the above embodiments, a press-fit type sleeved aluminum cylinder has been described, but the present invention can also be applied to a cast-in type sleeved aluminum cylinder, and the same effects as described above can be obtained.
以上のように、本発明に係る２サイクルエンジンのシリ
ンダによれば、シリンダ本体の掃気通路部分にスリーブ
と押圧状態で当接し、かつスリーブの軸方向に延びるバ
ックアップ部を一体形成したので、スリーブの掃気通路
部分にも他の部分と略同等な圧入圧力等を作用させるこ
とができ、スリーブの熱間時における真円度、真直度を
大きく改善できる効果がある。As described above, according to the cylinder of the two-stroke engine according to the present invention, since the backup portion is integrally formed in the scavenging passage portion of the cylinder body, the backup portion is in contact with the sleeve in a pressed state and extends in the axial direction of the sleeve. It is possible to apply substantially the same press-fitting pressure to the scavenging passage as to other parts, and this has the effect of greatly improving the roundness and straightness of the sleeve when it is hot.
第１図ないし第５図は本発明の一実施例による２サイク
ルエンジンのシリンダを説明するための図であり、第１
図はその主婦気道路のバックアップ部部分の断面側面図
、第２図はその断面正面図、第３図は上記シリンダの断
面側面図、第４図はその底面図、第５図は上記シリンダ
が採用されたエンジンの一部断面正面図、第６図は従来
の掃気通路部分を示す断面側面図である。
図において、１は２サイクルエンジン、３はシリンダ、
８はシリンダ本体、９はスリーブ、１１゜１２は掃気通
路、ｌｌｂ、１２ｂはバックアップ部である。1 to 5 are diagrams for explaining a cylinder of a two-stroke engine according to an embodiment of the present invention, and FIG.
The figure is a cross-sectional side view of the backup part of the airway, Figure 2 is a front cross-sectional view, Figure 3 is a cross-sectional side view of the cylinder, Figure 4 is a bottom view, and Figure 5 is a cross-sectional front view of the cylinder. FIG. 6 is a partially sectional front view of the adopted engine, and FIG. 6 is a sectional side view showing a conventional scavenging passage. In the figure, 1 is a two-stroke engine, 3 is a cylinder,
8 is a cylinder body, 9 is a sleeve, 11° and 12 are scavenging passages, and llb and 12b are backup parts.
Claims (1)
ンダ本体内に鋳鉄製スリーブを配設してなる２サイクル
エンジンのシリンダにおいて、上記シリンダ本体の掃気
通路内面に上記スリーブの外面と押圧状態で当接し、か
つ該スリーブの軸方向に延びるバックアップ部を一体形
成したことを特徴とする２サイクルエンジンのシリンダ
。(1) In a two-stroke engine cylinder in which a cast iron sleeve is disposed within a cylinder body made of aluminum alloy (hereinafter referred to as aluminum), the outer surface of the sleeve contacts the inner surface of the scavenging passage of the cylinder body under pressure. , and a backup portion extending in the axial direction of the sleeve is integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61224135A JP2564523B2 (en) | 1986-09-22 | 1986-09-22 | 2-cycle engine cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61224135A JP2564523B2 (en) | 1986-09-22 | 1986-09-22 | 2-cycle engine cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6380048A true JPS6380048A (en) | 1988-04-11 |
| JP2564523B2 JP2564523B2 (en) | 1996-12-18 |
Family
ID=16809092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61224135A Expired - Fee Related JP2564523B2 (en) | 1986-09-22 | 1986-09-22 | 2-cycle engine cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2564523B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5615650A (en) * | 1994-11-11 | 1997-04-01 | Kioritz Corporation | Engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57200647A (en) * | 1981-06-04 | 1982-12-08 | Yamaha Motor Co Ltd | Cylinder in two-cycle engine |
| JPS62276217A (en) * | 1986-05-23 | 1987-12-01 | Suzuki Motor Co Ltd | Scavenge air passage for two-cycle engine |
-
1986
- 1986-09-22 JP JP61224135A patent/JP2564523B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57200647A (en) * | 1981-06-04 | 1982-12-08 | Yamaha Motor Co Ltd | Cylinder in two-cycle engine |
| JPS62276217A (en) * | 1986-05-23 | 1987-12-01 | Suzuki Motor Co Ltd | Scavenge air passage for two-cycle engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5615650A (en) * | 1994-11-11 | 1997-04-01 | Kioritz Corporation | Engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2564523B2 (en) | 1996-12-18 |
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