JPS6018616Y2 - 2 cycle engine - Google Patents
2 cycle engineInfo
- Publication number
- JPS6018616Y2 JPS6018616Y2 JP1976014593U JP1459376U JPS6018616Y2 JP S6018616 Y2 JPS6018616 Y2 JP S6018616Y2 JP 1976014593 U JP1976014593 U JP 1976014593U JP 1459376 U JP1459376 U JP 1459376U JP S6018616 Y2 JPS6018616 Y2 JP S6018616Y2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- mating surface
- intake passage
- crankcase
- passage
- 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
Links
Description
【考案の詳細な説明】
この考案は吸気通路をシリンダとクランクケースとの合
わせ面で形成した２サイクルエンジンに関する。[Detailed Description of the Invention] This invention relates to a two-stroke engine in which an intake passage is formed by a mating surface between a cylinder and a crankcase.
従来、２サイクルエンジンにおいてクランク室への吸気
通路はシリンダ側かクランクケース側の何れかに設けて
いるが、何れの場合もそれらの鋳造には吸気通路を形成
するための中子を必要とする。Conventionally, in two-stroke engines, the intake passage to the crank chamber is provided either on the cylinder side or on the crankcase side, but in either case, casting them requires a core to form the intake passage. .
この考案は吸気通路形状をシリンダとクランクケースと
の合わせ面形成用の型で得られるようにしたものであり
、したがって吸気通路の形成には中子は不要になり、そ
れだけ鋳造作業を簡素化させると同時に、コストダウン
をはかることができる。This idea allows the shape of the intake passage to be obtained using a mold for forming the mating surfaces of the cylinder and crankcase.Therefore, no core is required to form the intake passage, which simplifies the casting process. At the same time, costs can be reduced.
以下その一実施例を図面にもとづいて説明する。One embodiment will be described below based on the drawings.
第１図において、１はシリンダ、２はクランクケース、
３は吸気通路、４は排気通路、５は掃気通路、６はシリ
ンダ１に嵌装されたピストン、７はクランクシャフト、
８はコンロッド、９はリードバルブ、１０は気化器、１
８はクランク室である。In Fig. 1, 1 is a cylinder, 2 is a crankcase,
3 is an intake passage, 4 is an exhaust passage, 5 is a scavenging passage, 6 is a piston fitted in the cylinder 1, 7 is a crankshaft,
8 is a connecting rod, 9 is a reed valve, 10 is a carburetor, 1
8 is a crank chamber.
吸気通路３はシリンダ１とクランクケース２との合わせ
面１１で形成されている。The intake passage 3 is formed by a mating surface 11 between the cylinder 1 and the crankcase 2.
つまり、第２図のように、シリンダとクランクケース２
とに、その合わせ面１１に臨ませて溝ＩＡ、２Ａを形成
し、シリンダ１とクランクケース２とを組み合わせたと
き、上記溝ＩＡ、２Ａにより合わせ面１１に形成される
空間を吸気通路３としている。In other words, as shown in Figure 2, the cylinder and crankcase 2
Grooves IA and 2A are formed facing the mating surface 11, and when the cylinder 1 and crankcase 2 are combined, the space formed in the mating surface 11 by the grooves IA and 2A is used as an intake passage 3. There is.
上記溝ＩＡ、２Ａは、第１図に示す合わせ面１１と平行
にシリンダ１の中心軸から径方向へ延び、かつ、合わせ
面１１と直交する方向へ型抜可能な形状に設定されてい
る。The grooves IA and 2A extend radially from the central axis of the cylinder 1 parallel to the mating surface 11 shown in FIG.
したがって、合わせ面１１と直交する方向へ開かれる合
わせ面形成用の型により、溝ＩＡ、２Ａが形成される。Therefore, the grooves IA and 2A are formed by a mold for forming a mating surface that is opened in a direction perpendicular to the mating surface 11.
吸気通路３は第２図のように合わせ面１１を境として対
称的または非対称的に設ける場合のほか、第３図のよう
にシリンダ１例の合わせ面１１ａを扁平としてクランク
ケース２側の合わせ面１１ｂにのみ溝２Ａを形成、ある
いは第４図のように、クランクケース２側の合わせ面１
１ｂを扁平として、シリンダケース１側の合わせ面１１
ａにのみ溝１Ａを形成するような態様で設けることもで
きる。In addition to the case where the intake passage 3 is provided symmetrically or asymmetrically with the mating surface 11 as a boundary as shown in FIG. The groove 2A is formed only in the groove 11b, or the mating surface 1 on the crankcase 2 side
1b is flat, and the mating surface 11 on the cylinder case 1 side
It is also possible to form the groove 1A only in the groove a.
第５図、第６図は第１図の変形例を示し、吸気通路３は
この吸気通路３と掃気通路５とを連通ずる補助通路１２
を有しており、掃気行程で、下降したピストン６とリー
ドバルブ９との間における吸気通路３に押し込められた
混合気を、補助通路１２から掃気通路５へ逃がすことに
より、後続する吸気工程において新しい吸気が吸気通路
３を通ってクランク室１３へ円滑に流入するようにして
いる。5 and 6 show a modification of FIG. 1, in which the intake passage 3 has an auxiliary passage 12 that communicates the intake passage 3 with the scavenging passage 5.
By releasing the air-fuel mixture forced into the intake passage 3 between the descending piston 6 and the reed valve 9 during the scavenging stroke from the auxiliary passage 12 to the scavenging passage 5, the air-fuel mixture is released during the subsequent intake stroke. New intake air is made to flow smoothly into the crank chamber 13 through the intake passage 3.
この補助通路１２は、たとえば第３図のシリンダ１側の
合わせ面１１ａを扁平として、クランクケース２側の合
わせ面１１ｂにのみ溝を形成することにより設けられて
いるが、この補助通路１２の形成構造は第１図の実施例
における第２図、第４図に示すようなものであってもよ
い。This auxiliary passage 12 is provided, for example, by flattening the mating surface 11a on the cylinder 1 side in FIG. 3 and forming a groove only on the mating surface 11b on the crankcase 2 side. The structure may be as shown in FIGS. 2 and 4 in the embodiment of FIG. 1.
以上のように、この考案によれば、シリンダの中心軸か
ら径方向へ延びる吸気通路をシリンダとクランクケース
との合わせ面形成用の型で得ることができる。As described above, according to this invention, an intake passage extending radially from the central axis of the cylinder can be obtained using a mold for forming a mating surface between the cylinder and the crankcase.
すなわち、吸気通路の形成には中子は不要になり、した
がって鋳造作業が簡素化されるト同時に、エンジンのコ
ストダウンをはかることができる。That is, a core is not required to form the intake passage, and therefore, the casting work is simplified, and at the same time, the cost of the engine can be reduced.
第１図はこの考案にかかる２サイクルエンジンの一実施
例を示す縦断面図、第２図ないし第４図は吸気通路の形
成態様を示す縦断正面図、第５図は第１図の変形例を示
す縦断側面図、第６図は第５図のＡ−Ａ線に沿う断面図
である。
１・・・・・・シリンダ、２・・・・・・クランクケー
ス、ＩＡ、２Ａ・・・・・・溝、３・・・・・・吸気通
路、５・・・・・・掃気通路、１０・・・・・・気化器
、１１．ｌｌａ、ｌｌｂ・・・・・・合わせ面、１２・
・・・・・補助通路、１３・・・・・・クランク室。FIG. 1 is a longitudinal sectional view showing an embodiment of a two-stroke engine according to this invention, FIGS. 2 to 4 are longitudinal sectional front views showing the manner in which the intake passage is formed, and FIG. 5 is a modification of FIG. 1. FIG. 6 is a sectional view taken along line A-A in FIG. 5. 1...Cylinder, 2...Crankcase, IA, 2A...Groove, 3...Intake passage, 5...Scavenging passage, 10... vaporizer, 11. lla, llb... mating surface, 12.
...Auxiliary passage, 13...Crank chamber.
Claims (2)
との合わせ面に臨ませて、シリンダとクランクケースの
少なくとも一方に、上記合わせ面と平行に上記シリンダ
の中心軸から径方向へ延び、かつ、合わせ面と直交する
方向へ型抜可能な溝を形成し、上記シリンダとクランク
ケースとを組み合わせたとき、上記溝により合わせ面に
形成される空間を吸気通路としたことを特徴とする２サ
イクルエンジン。(1) Extending radially from the central axis of the cylinder parallel to the mating surface on at least one of the cylinder and the crankcase, facing the mating surface between the cylinder and the crankcase in which the piston is fitted, and A two-stroke engine characterized in that a groove that can be cut out is formed in a direction perpendicular to the mating surface, and when the cylinder and crankcase are combined, the space formed in the mating surface by the groove is an intake passage. .
る補助通路を有してなる実用新案登録請求の範囲第１項
記載の２サイクルエンジン。(2) The two-stroke engine according to claim 1, wherein the intake passage has an auxiliary passage leading from the intake passage to the scavenging passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1976014593U JPS6018616Y2 (en) | 1976-02-10 | 1976-02-10 | 2 cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1976014593U JPS6018616Y2 (en) | 1976-02-10 | 1976-02-10 | 2 cycle engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS52106717U JPS52106717U (en) | 1977-08-13 |
| JPS6018616Y2 true JPS6018616Y2 (en) | 1985-06-05 |
Family
ID=28474845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1976014593U Expired JPS6018616Y2 (en) | 1976-02-10 | 1976-02-10 | 2 cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6018616Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5773844A (en) * | 1980-10-23 | 1982-05-08 | Yamaha Motor Co Ltd | Joint surface construction between cylinder body and crank case in engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE365191C (en) * | 1922-12-09 | William Joseph Still | Cylinder for two-stroke internal combustion engines with exhaust ports arranged below | |
| GB515155A (en) * | 1938-05-25 | 1939-11-28 | James Denning Pearson | Improvements in the cylinders of sleeve-valve engines |
| US2731960A (en) * | 1956-01-24 | Internal combustion engine with die cast block | ||
| US3641987A (en) * | 1969-03-07 | 1972-02-15 | Bernard Hooper | Two-stroke engines |
| JPS4835888A (en) * | 1971-08-12 | 1973-05-26 |
-
1976
- 1976-02-10 JP JP1976014593U patent/JPS6018616Y2/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE365191C (en) * | 1922-12-09 | William Joseph Still | Cylinder for two-stroke internal combustion engines with exhaust ports arranged below | |
| US2731960A (en) * | 1956-01-24 | Internal combustion engine with die cast block | ||
| GB515155A (en) * | 1938-05-25 | 1939-11-28 | James Denning Pearson | Improvements in the cylinders of sleeve-valve engines |
| US3641987A (en) * | 1969-03-07 | 1972-02-15 | Bernard Hooper | Two-stroke engines |
| JPS4835888A (en) * | 1971-08-12 | 1973-05-26 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS52106717U (en) | 1977-08-13 |
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