JPH053773Y2 - - Google Patents
Info
- Publication number
- JPH053773Y2 JPH053773Y2 JP1985097868U JP9786885U JPH053773Y2 JP H053773 Y2 JPH053773 Y2 JP H053773Y2 JP 1985097868 U JP1985097868 U JP 1985097868U JP 9786885 U JP9786885 U JP 9786885U JP H053773 Y2 JPH053773 Y2 JP H053773Y2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- dam
- oil dam
- bearing
- shaft hole
- 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
Links
- 238000004891 communication Methods 0.000 claims description 10
- 239000003921 oil Substances 0.000 description 48
- 238000013016 damping Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 5
- 239000000945 filler Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Description
【考案の詳細な説明】
Ａ 産業上の利用分野
本考案はジヤーナル軸受に関し、特にオイルダ
ムを改良したものである。[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a journal bearing, and in particular is an improved oil dam.
Ｂ 考案の概要
本考案は、回転軸を支持する軸孔の内周面の上
部にオイルダムを刻設したジヤーナル軸受におい
て、
オイルダムの終端と終端から離間したオイルポ
ートとの間にオイルダムの幅より小幅の連通溝を
刻設することにより、
回転軸の周速が40ｍ／sec以下でも油量が充分
に流れて冷却効率が低下せず、オイルホイツプの
発生が防止され、かつ、制振性が低下しないよう
にしたものである。B. Summary of the invention The invention proposes a journal bearing in which an oil dam is carved into the upper part of the inner circumferential surface of the shaft hole that supports the rotating shaft. By cutting the communication grooves, even if the circumferential speed of the rotating shaft is 40m/sec or less, a sufficient amount of oil flows, the cooling efficiency does not decrease, the occurrence of oil whip is prevented, and the damping performance does not deteriorate. This is how it was done.
Ｃ 従来の技術
一般に、タービン、タービン発電機等には高速
回転する回転軸としてのロータが存在し、ロータ
を支える軸受にはロータを支える機能と振動を抑
止する制振性とが要求される。しかしながら、こ
のようなロータでは定格回転まで上昇する途中に
おける危険速度通過時の不均衡振動や、高速運転
時の油膜の自励振動に因るオイルホイツプ、オイ
ルホワールの発生が大きな振動として現われるこ
とが多い。したがつて、このような振動を防止す
るためには、軸受の内周面の上部にオイルダムを
形成することが行なわれる。このオイルダムはロ
ータの回転によつて軸受内周面の上部に油を循環
させることによりオイルダム内の油圧でロータに
下方へ向かう押圧力を加える（オイルダム効果）
ものであるが、第３図及び第４図に示した如く、
従来のオイルダム１は軸受２の軸孔２ａの内周面
の上部であつて略半部（120°〜145°）に深さ１mm
程度の長方形からなる溝３を刻設し、かつ、この
溝３の始端に連通するオイルポート４と終端から
離間するオイルポート５をそれぞれ付設したもの
であつた。そしてオイルポート４に臨んで給油口
６が設けられている。ロータ７が軸受２内で矢印
の方向へ回転すると、ロータ７の回転によりポン
プ作用が生じて給油口６からオイルポート４を介
して潤滑油が矢印方向へ吸引されロータ周囲を充
満するように給油がなされることになる。C. Prior Art In general, turbines, turbine generators, etc. have a rotor as a rotating shaft that rotates at high speed, and bearings that support the rotor are required to have the function of supporting the rotor and damping properties that suppress vibration. However, with such a rotor, large vibrations often appear due to unbalanced vibrations when passing critical speeds on the way up to the rated speed, and oil whip and oil whirl caused by self-excited vibrations of the oil film during high-speed operation. . Therefore, in order to prevent such vibrations, an oil dam is formed above the inner peripheral surface of the bearing. This oil dam circulates oil to the upper part of the inner peripheral surface of the bearing as the rotor rotates, and the hydraulic pressure inside the oil dam applies downward pressure to the rotor (oil dam effect).
However, as shown in Figures 3 and 4,
The conventional oil dam 1 has a depth of 1 mm at the upper part of the inner peripheral surface of the shaft hole 2a of the bearing 2, approximately in half (120° to 145°).
A groove 3 having a rectangular shape of about 100 mm was carved, and an oil port 4 communicating with the starting end of the groove 3 and an oil port 5 spaced apart from the terminal end were attached, respectively. An oil filler port 6 is provided facing the oil port 4. When the rotor 7 rotates in the direction of the arrow within the bearing 2, a pump action occurs due to the rotation of the rotor 7, and lubricating oil is sucked in the direction of the arrow from the oil filler port 6 through the oil port 4, filling the area around the rotor. will be done.
Ｄ 考案が解決しようとする課題
しかしながら、上記従来の技術によれば、ロー
タ７の周速が40ｍ／sec以下では、給油量が不足
し、軸受自体の金属の温度が高く上昇するので、
軸受焼損の危険性が極めて高く、またオイルダム
内に十分な油圧が得られず制振性が確保できない
という問題がある。D Problems to be solved by the invention However, according to the above conventional technology, when the circumferential speed of the rotor 7 is 40 m/sec or less, the amount of oil supplied is insufficient and the temperature of the metal of the bearing itself increases.
There is an extremely high risk of bearing burnout, and there is also the problem that sufficient hydraulic pressure cannot be obtained within the oil dam, making it impossible to ensure vibration damping performance.
Ｅ 課題を解決するための手段
本考案は上記課題を解決するため、回転軸を支
持する軸孔の内周面の上部にオイルダムを刻設し
たジヤーナル軸受において、前記オイルダムの終
端とオイルダムから離間したオイルポートとを結
ぶオイルダムより小幅の連通溝を刻設したジヤー
ナル軸受を提供する。この場合において、軸受の
内径をＤ、軸孔の長さをＬ、オイルダムの幅を
B1、連通溝の幅をB2としたとき、Ｌ／Ｄ＝0.7〜
0.8，B1／Ｌ＝0.45〜0.5，B2／B1＝0.25であるこ
とが好適な実施態様である。E Means for Solving the Problems In order to solve the above problems, the present invention provides a journal bearing in which an oil dam is carved in the upper part of the inner circumferential surface of the shaft hole that supports the rotating shaft. To provide a journal bearing in which a communication groove smaller in width than an oil dam is carved to connect an oil port. In this case, the inner diameter of the bearing is D, the length of the shaft hole is L, and the width of the oil dam is
B1 , when the width of the communication groove is B2 , L/D=0.7~
0.8, B 1 /L=0.45 to 0.5, and B 2 /B 1 =0.25 in a preferred embodiment.
Ｆ 作用
本考案の上記構成によれば、連通溝を刻設する
ことによつてオイルダムの始端とオイルダムの終
端から離間した位置に配されたオイルポートとの
間の油の流通が良好となり、回転軸の周速が40
ｍ／sec以下でも軸受焼損の危険が生じないとと
もにオイルダム内の圧力低下が防止され制振性が
確保される。F Effect According to the above-mentioned configuration of the present invention, by carving the communication groove, the oil circulation between the starting end of the oil dam and the oil port arranged at a position apart from the ending end of the oil dam is improved, and rotation of the oil dam is improved. The peripheral speed of the shaft is 40
m/sec or less, there is no risk of bearing burnout, and a pressure drop in the oil dam is prevented, ensuring vibration damping performance.
Ｇ 実施例
以下に本考案を実施例に基づいて説明する。第
１図及び第２図は第３図及び第４図と対応した縦
断面図及び第１図のＡ−Ａ矢視図（展開図）であ
り、図面中の同一符号の部分は全て同一部分を示
す。G. Examples The present invention will be described below based on examples. Figures 1 and 2 are longitudinal cross-sectional views corresponding to Figures 3 and 4, and a view taken along the line A-A in Figure 1 (developed view), and all parts with the same reference numerals in the drawings are the same parts. shows.
図示のように、オイルダム１の終端とオイルダ
ム１から離間したオイルポート５との間に連通溝
８を刻設して形成する。 As shown in the figure, a communication groove 8 is carved and formed between the terminal end of the oil dam 1 and the oil port 5 spaced apart from the oil dam 1.
連通溝８の幅をB2、オイルダム１の幅をB1、
軸受２の幅をＬとしたとき、Ｌ／Ｄ＝0.7〜0.8，
B1／Ｌ＝0.45〜0.5，B2／B1＝0.25であり、かつ、
オイルダム１の刻設範囲が120°であつて、深さＨ
＝１mmであれば、周速40ｍ／sec以下のジヤーナ
ル軸受としても好適することが実験により明らか
になつた。つまり、周速40ｍ／sec以下の軸受と
して使用する場合にもオイルダム１内の圧油がロ
ータ７に上から下へ向かう押圧力を与えるオイル
ダム効果を失うことなく、油量も充分で軸受その
ものの冷却効果が高い。しかもオイルホイツプの
発生を防止し、制振性も良好である。 The width of the communication groove 8 is B 2 , the width of the oil dam 1 is B 1 ,
When the width of bearing 2 is L, L/D=0.7~0.8,
B 1 /L = 0.45 to 0.5, B 2 /B 1 = 0.25, and
The engraving range of oil dam 1 is 120°, and the depth H
= 1 mm, it was found through experiments that it is also suitable as a journal bearing at peripheral speeds of 40 m/sec or less. In other words, even when used as a bearing at a circumferential speed of 40 m/sec or less, the pressure oil in the oil dam 1 does not lose its oil dam effect of applying a downward pressure on the rotor 7, and the amount of oil is sufficient to protect the bearing itself. High cooling effect. Moreover, it prevents oil whip from occurring and has good vibration damping properties.
Ｈ 考案の効果
以上説明した本考案によれば、オイルダムの終
端とオイルダムから離間して位置するオイルポー
トとの間に連通溝を刻設したので、回転軸の周速
が40ｍ／sec以下の場合にも充分な給油量が得ら
れると同時に、オイルダム効果を失うことなく制
振性の高い軸受を得ることができる。H. Effect of the invention According to the invention explained above, a communication groove is carved between the end of the oil dam and the oil port located apart from the oil dam, so that when the circumferential speed of the rotating shaft is 40 m/sec or less, At the same time, it is possible to obtain a bearing with high vibration damping properties without losing the oil dam effect.
第１図は本考案の一実施例を示すジヤーナル軸
受の縦断面図、第２図は第１図のＡ−Ａ軸孔展開
図、第３図は従来例を示すジヤーナル軸受の縦断
面図、第４図は第３図のＢ−Ｂ軸孔展開図であ
る。
１……オイルダム、２……軸受、２ａ……軸
孔、３……溝、４，５……オイルポート、６……
給油口、７……ロータ、８……連通溝。
Fig. 1 is a longitudinal sectional view of a journal bearing showing an embodiment of the present invention, Fig. 2 is a developed view of the shaft hole taken along the line A-A in Fig. 1, and Fig. 3 is a longitudinal sectional view of a journal bearing showing a conventional example. FIG. 4 is a developed view of the BB shaft hole in FIG. 3. 1... Oil dam, 2... Bearing, 2a... Shaft hole, 3... Groove, 4, 5... Oil port, 6...
Oil filler port, 7... rotor, 8... communication groove.
Claims (1)
ルダムを刻設したジヤーナル軸受において、前
記オイルダムの終端と終端から離間して位置す
るオイルポートとの間にオイルダムの幅より小
幅の連通溝を刻設したことを特徴とするジヤー
ナル軸受。 (2) 前記軸孔の内径をＤ、軸孔の長さをＬ、オイ
ルダムの幅をB1、連通溝の幅をB2としたとき、
Ｌ／Ｄ＝0.7〜0.8、B1／Ｌ＝0.45〜0.5、B2／B1
＝0.25を満足することを特徴とする実用新案登
録請求の範囲第１項記載のジヤーナル軸受。[Claims for Utility Model Registration] (1) In a journal bearing in which an oil dam is carved in the upper part of the inner circumferential surface of a shaft hole that supports a rotating shaft, a terminal end of the oil dam and an oil port located apart from the terminal end are provided. A journal bearing characterized by having a communication groove carved in between that is narrower than the width of the oil dam. (2) When the inner diameter of the shaft hole is D, the length of the shaft hole is L, the width of the oil dam is B1 , and the width of the communication groove is B2 ,
L/D=0.7~0.8, B1 /L=0.45~0.5, B2 / B1
=0.25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985097868U JPH053773Y2 (en) | 1985-06-27 | 1985-06-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985097868U JPH053773Y2 (en) | 1985-06-27 | 1985-06-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS626530U JPS626530U (en) | 1987-01-16 |
| JPH053773Y2 true JPH053773Y2 (en) | 1993-01-29 |
Family
ID=30965264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985097868U Expired - Lifetime JPH053773Y2 (en) | 1985-06-27 | 1985-06-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH053773Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0833259A (en) * | 1994-07-22 | 1996-02-02 | Meidensha Corp | Slide bearing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58177621U (en) * | 1982-05-21 | 1983-11-28 | 三菱重工業株式会社 | journal bearing |
-
1985
- 1985-06-27 JP JP1985097868U patent/JPH053773Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS626530U (en) | 1987-01-16 |
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