JPS595224Y2 - 2-cycle engine crankshaft sealing device - Google Patents
2-cycle engine crankshaft sealing deviceInfo
- Publication number
- JPS595224Y2 JPS595224Y2 JP1978087747U JP8774778U JPS595224Y2 JP S595224 Y2 JPS595224 Y2 JP S595224Y2 JP 1978087747 U JP1978087747 U JP 1978087747U JP 8774778 U JP8774778 U JP 8774778U JP S595224 Y2 JPS595224 Y2 JP S595224Y2
- Authority
- JP
- Japan
- Prior art keywords
- shaft hole
- large diameter
- crankshaft
- crankcase
- sealing device
- 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
Landscapes
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Description
【考案の詳細な説明】
この考案は、２サイクルエンジンのクランク軸シール装
置の改良に関する。[Detailed Description of the Invention] This invention relates to an improvement of a crankshaft sealing device for a two-stroke engine.
多気筒２サイクルエンジンの、各気筒間のクランク軸部
は、オイルシール等によってシールしているが、オイル
シールでは、シールリップが摺擦して抵抗になる。The crankshaft between the cylinders of a multi-cylinder two-stroke engine is sealed with an oil seal or the like, but the oil seal's seal lip rubs against it and creates resistance.
これをさけるため、ラビリンス溝によるメカニカルシー
ル
が、クランク軸にベアリングを装着するため、クランク
軸とクランクケースの軸孔の径が異り、ラビリンス溝環
を別に設けて取付けており、製作手間及び組付は手間が
かがって、製作コストが高く、各嵌合部も高精度にする
必要があって、一層高価についている。To avoid this, mechanical seals with labyrinth grooves attach bearings to the crankshaft, so the diameters of the shaft holes in the crankshaft and crankcase are different, and a labyrinth groove ring is provided separately for installation, which reduces manufacturing time and assembly. Attachment is time consuming and expensive to manufacture, and each fitting part also needs to be highly accurate, making it even more expensive.
この考案は、かかる点に鑑み改善したもので、以下図面
に示す本考案の実施例について説明する。This invention has been improved in view of these points, and an embodiment of the invention shown in the drawings will be described below.
図は三気筒の場合を示すもので、各気筒の一対のクラン
クホイール１， １：２， ２；３， ３間に各
々コネクチングロッド４が装着される。The figure shows a three-cylinder engine, in which a connecting rod 4 is installed between a pair of crank wheels 1, 1:2, 2; 3, 3 for each cylinder.
各気筒の隣り合うクランクホイール１，２及び２，３間
は、中間クランク軸５で連結される。Adjacent crank wheels 1, 2 and 2, 3 of each cylinder are connected by an intermediate crankshaft 5.
而して本考案は、中間クランク軸５を太径部６と細径部
７に形成する。Accordingly, in the present invention, the intermediate crankshaft 5 is formed into a large diameter portion 6 and a small diameter portion 7.
そして、細径部７はベアリング８を介してクランクケー
ス９の軸孔１０に回転自在に支承する。The narrow diameter portion 7 is rotatably supported in a shaft hole 10 of the crankcase 9 via a bearing 8.
又、大径部６は、クランクケース９の軸孔１０に近接す
る太さとし、太径部６又は軸孔１０の近接する部分の一
方にラビリンス溝１１を設ける。Further, the large diameter portion 6 has a thickness close to the shaft hole 10 of the crankcase 9, and a labyrinth groove 11 is provided in either the large diameter portion 6 or the portion adjacent to the shaft hole 10.
両端クランク軸１２は、ベアリング１３を介してクラン
クケース９の軸孔１０に支承し、その外側にオイルシー
ル１４を取着しである。The crankshafts 12 at both ends are supported in shaft holes 10 of the crankcase 9 via bearings 13, and oil seals 14 are attached to the outside thereof.
作用について説明する。The effect will be explained.
中間クランク軸５の大径部６がクランクケース９の軸孔
１０に近接でき、ラビリンス溝１１によってシール効果
が生じ、気筒間のシールができる。The large diameter portion 6 of the intermediate crankshaft 5 can be brought close to the shaft hole 10 of the crankcase 9, and a sealing effect is produced by the labyrinth groove 11, thereby creating a seal between the cylinders.
そして、軸孔１０と太径部６の近接部分の精度を保つこ
とは、直接液する部品間であるので容易にでき、精度が
出し易い。Furthermore, it is easy to maintain accuracy in the vicinity of the shaft hole 10 and the large diameter portion 6 because these parts are in direct contact with each other, and it is easy to maintain accuracy.
又、ラビリンス溝１１も、軸（Ｌｌｏ又は、クランク軸
側に設ける場合は大径部６の切削加工時に同時にでき、
精度も高くできる。In addition, if the labyrinth groove 11 is provided on the shaft (Llo or crankshaft side), it can be formed at the same time when cutting the large diameter portion 6.
Accuracy can also be increased.
以上説明したように、この考案は、多気筒２サイクルエ
ンジンに於て、隣り合うクランクホイールを連結する中
間クランク軸を、大径部と細径部に形成し、細径部はベ
アリングを介してクランクケースの軸孔に支承し、大径
部はクランクケースの軸孔に近接させ、近接した大径部
又は軸孔の一方にラビリンス溝を設けたので、ラビリン
ス溝によって気筒間のシールが保てると共に、ラビリン
ス溝をクランク軸の大径部又はクランクケースの軸孔面
に設けることができるので、高い精度が容易に得られ安
価に製作できる。As explained above, this idea forms the intermediate crankshaft that connects adjacent crank wheels in a multi-cylinder two-stroke engine into a large diameter part and a small diameter part, and the small diameter part is connected via a bearing. It is supported in the shaft hole of the crankcase, the large diameter part is placed close to the shaft hole of the crankcase, and a labyrinth groove is provided in either the adjacent large diameter part or the shaft hole, so the labyrinth groove can maintain a seal between the cylinders. Since the labyrinth groove can be provided on the large diameter portion of the crankshaft or on the shaft hole surface of the crankcase, high precision can be easily obtained and manufacturing can be done at low cost.
又、組付は不良等の心配もなく、異音等のトラブルもな
くなる。Furthermore, there is no need to worry about defects during assembly, and there are no problems such as abnormal noises.
図は本考案の一実施例を示す縦断面図である。
１、２．３・・・・・・クランクホイール、５・・・・
・・中間クランク軸、６・・・・・・太径部、７・・・
・・・細径部、Ｂ・・・・・・ベアリング、９・・・・
・・クランクケース、１０・・・・・・軸孔、１１・・
・・・・ラビリンス溝。The figure is a longitudinal sectional view showing an embodiment of the present invention. 1, 2.3...Crank wheel, 5...
...Intermediate crankshaft, 6...Large diameter part, 7...
...Small diameter part, B...Bearing, 9...
...Crankcase, 10...Shaft hole, 11...
...Labyrinth groove.
Claims (1)
イールを連結する中間クランク軸を、大径部と細径部に
形成し、細径部はベアリングを介してクランクケースの
軸孔に支承し、大径部はクランクケースの軸孔に近接さ
せ、近接した大径部又は軸孔の一方にラビリンス溝を設
けたことを特徴とする２サイクルエンジンのクランク軸
シール装置。In a multi-cylinder two-stroke engine, the intermediate crankshaft that connects adjacent crank wheels is formed into a large diameter part and a small diameter part, and the small diameter part is supported in the shaft hole of the crankcase via a bearing. A crankshaft sealing device for a two-stroke engine, characterized in that the diameter portion is located close to the shaft hole of the crankcase, and a labyrinth groove is provided in either the adjacent large diameter portion or the shaft hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978087747U JPS595224Y2 (en) | 1978-06-26 | 1978-06-26 | 2-cycle engine crankshaft sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978087747U JPS595224Y2 (en) | 1978-06-26 | 1978-06-26 | 2-cycle engine crankshaft sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS556564U JPS556564U (en) | 1980-01-17 |
| JPS595224Y2 true JPS595224Y2 (en) | 1984-02-16 |
Family
ID=29013567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1978087747U Expired JPS595224Y2 (en) | 1978-06-26 | 1978-06-26 | 2-cycle engine crankshaft sealing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS595224Y2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5898916U (en) * | 1981-12-28 | 1983-07-05 | オージー技研株式会社 | Free-standing bathing aid for physically disabled people |
| JPS59184829U (en) * | 1983-05-26 | 1984-12-08 | 宮川 功 | bathtub |
| JPS6020218U (en) * | 1983-07-21 | 1985-02-12 | 株式会社 ノヴアエンジニアリング | Betsudo |
| JPH0443620Y2 (en) * | 1985-12-28 | 1992-10-15 | ||
| GB2249722B (en) * | 1990-11-15 | 1994-04-13 | Helping Hand Company The | Bath lift |
| JP7283433B2 (en) * | 2020-03-31 | 2023-05-30 | いすゞ自動車株式会社 | Seal structure |
-
1978
- 1978-06-26 JP JP1978087747U patent/JPS595224Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS556564U (en) | 1980-01-17 |
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