JP3244913B2 - Gearbox for wind power generation - Google Patents
Gearbox for wind power generationInfo
- Publication number
- JP3244913B2 JP3244913B2 JP02091494A JP2091494A JP3244913B2 JP 3244913 B2 JP3244913 B2 JP 3244913B2 JP 02091494 A JP02091494 A JP 02091494A JP 2091494 A JP2091494 A JP 2091494A JP 3244913 B2 JP3244913 B2 JP 3244913B2
- Authority
- JP
- Japan
- Prior art keywords
- speed
- stage
- roller
- power generation
- speed stage
- 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 - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/20—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members
- F16H1/22—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
- F16H1/227—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts comprising two or more gearwheels in mesh with the same internally toothed wheel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
- F16H37/04—Combinations of toothed gearings only
- F16H37/041—Combinations of toothed gearings only for conveying rotary motion with constant gear ratio
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wind Motors (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は主に風力発電用の風車に
適用される増速機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gearbox mainly applied to a wind turbine for wind power generation.
【0002】[0002]
【従来の技術】一般に風力発電用の風車は図3に示すよ
うな概略構造をしている。図中1は翼であり風を受けて
回転する。この回転は軸受7にて支持されたブレード入
力軸4を介して増速機2に伝達され、更に出力軸5を経
て発電機3に伝わり、同発電機の回転によって電力を生
み出す。なお、増速機2や発電機3を格納しているのが
ナセル6であり、良質の風力エネルギーが得られるよう
タワー8の最上部に取付けてある。通常前記増速機2に
は、遊星歯車タイプのものが使用されるが、特願平3−
241367号に示すような低騒音化のため遊星ローラ
式トラクションドライブを採用したものも提案されてい
る。この提案された風車の概略構造を図4、図5に示
す。風力によって回転される風車には大トルクが作用す
る上、増速比が40前後と大きいため、歯車方式、トラ
クションドライブ方式の何れであっても、低速段と高速
段の二段式増速が採用されている。また低速段部には、
ブレード入力軸4の中空部分や低速段の増速部に翼のピ
ッチコントロール用配線や、油圧配管などを連通させる
必要があるため、遊星ローラが公転しない型のものが採
用される。図4、図5に示すように、低速段では、ブレ
ード入力軸4からの回転はリングローラ10の回転とな
り、ケーシングから周方向にて適数個(4個)穿設され
た遊星ローラピン12に軸支された遊星ローラ11を摩
擦により回転させ、同遊星ローラ11の回転は、これら
遊星ローラ11の中心部に位置する太陽ローラ9に増速
されて伝わり、同太陽ローラ9の回転は高速段における
遊星ローラ枠及び遊星ローラピンの回転となり、同遊星
ローラピンに軸支された遊星ローラは、これに外接する
リングローラが固定されているので、同リングローラと
の摩擦により公自転して、遊星ローラ群の中心に位置す
る出力軸5を増速して回転させ、同出力軸5からの出力
は発電機の入力軸に伝えられる。2. Description of the Related Art Generally, a wind turbine for wind power generation has a schematic structure as shown in FIG. In the figure, reference numeral 1 denotes a wing, which rotates in response to wind. This rotation is transmitted to the gearbox 2 via the blade input shaft 4 supported by the bearing 7, and further transmitted to the generator 3 via the output shaft 5, and generates electric power by the rotation of the generator. The accumulator 2 and the generator 3 are stored in the nacelle 6 and are mounted on the top of the tower 8 so that high-quality wind energy can be obtained. Normally, a planetary gear type is used for the speed increaser 2;
A device employing a planetary roller type traction drive for reducing noise as shown in Japanese Patent No. 241367 has also been proposed. The schematic structure of the proposed wind turbine is shown in FIGS. A large torque acts on the windmill rotated by the wind, and the speed increase ratio is as large as about 40. Therefore, regardless of the gear system or the traction drive system, the two-stage speed increase of the low speed stage and the high speed stage is achieved. Has been adopted. In the low-speed step,
Since it is necessary to connect the blade pitch control wiring and the hydraulic piping to the hollow portion of the blade input shaft 4 and the speed increasing portion of the low speed stage, a type in which the planetary rollers do not revolve is employed. As shown in FIGS. 4 and 5, in the low-speed stage, the rotation from the blade input shaft 4 becomes the rotation of the ring roller 10, and a suitable number (four) of the planetary roller pins 12 formed in the circumferential direction from the casing. The supported planetary roller 11 is rotated by friction, and the rotation of the planetary roller 11 is transmitted to the sun roller 9 located at the center of the planetary roller 11 at an increased speed. The rotation of the planetary roller frame and the planetary roller pin in the above, the planetary roller supported by the planetary roller pin is revolved by friction with the ring roller because the ring roller circumscribing the planetary roller is fixed. The output shaft 5 located at the center of the group is rotated at an increased speed, and the output from the output shaft 5 is transmitted to the input shaft of the generator.
【0003】[0003]
【発明が解決しようとする課題】従来の風車は遊星歯車
式増速機から大きな騒音を発生するために、民家から遠
く離れた地域でしか設置できなかったのであるが、前記
の如く風車の増速機をトラクションドライブ化したこと
で、騒音問題は解決し、設置場所の制約が少なくなり、
良質の風力エネルギーを得られる様になった。しかしな
がら、ローラ寿命(スポーリングなどの疲労剥離)を維
持するため、疲労に有害なローラ同志の直接接触を、ロ
ーラ間に油膜を形成させて油膜分離により回避する必要
があり、このため形成される油膜厚さ以下にローラ表面
を鏡面仕上げにする極めて高い加工精度が要求されるも
のであった。この結果、加工工数増加によるコストアッ
プを生じ、広く風車一般に採用されることなく、低騒音
化を最優先するケースでのみの極く限られた使用となる
虞れがあった。このようなことから、各ローラの加工コ
ストを調査したところ、リングローラの内面研磨が最も
高コスト(丸棒の外面研磨はコスト上問題ない)とな
り、また増速機全体の騒音は、風車全体の騒音に影響し
ないレベルに低下していれば良い現状にある。従って、
伝達トルクが小さい高速段側の増速機を、遊星ローラ式
からコストの低い平行軸ローラトラクションドライブ又
は、平行軸ヘリカル歯車とし、低速段のスター型遊星ロ
ーラトラクションドライブに直結させればよいことが知
見された。このため本発明は、この知見に基づき前記課
題を解決して風力発電用風車における増速機全体の低騒
音化を維持した状態で、装置の簡単化と低コスト化を図
るようにした風力発電用増速器を提供しようとするもの
である。The conventional wind turbines can be installed only in an area far from a private house because of the loud noise generated by the planetary gear type gearbox. By using a traction drive for the high-speed machine, the noise problem was solved, and the installation location was less restricted.
You can now get good quality wind energy. However, in order to maintain the life of the rollers (fatigue peeling such as spalling), it is necessary to avoid direct contact between the rollers, which is harmful to fatigue, by forming an oil film between the rollers and separating the oil film. Extremely high processing accuracy for mirror finishing the roller surface below the oil film thickness is required. As a result, the cost increases due to an increase in the number of processing steps, and there is a possibility that the use is limited only in a case where noise reduction is the highest priority, without being widely adopted in general wind turbines. Therefore, when the processing cost of each roller was investigated, the inner surface polishing of the ring roller was the most expensive (the outer surface polishing of the round bar was no problem in terms of cost). The situation is good if it is reduced to a level that does not affect the noise. Therefore,
What is necessary is to use a low-cost parallel shaft roller traction drive or a low cost parallel shaft helical gear from the planetary roller type to increase the speed at the high speed side with a small transmission torque, and directly connect to the low speed stage star type planetary roller traction drive. It was found. Therefore, the present invention solves the above-described problems based on this finding, and achieves simplification of the apparatus and cost reduction while maintaining low noise of the entire gearbox in the wind turbine for wind power generation. It is intended to provide a gearbox for a vehicle.
【0004】[0004]
【課題を解決するための手段】このため本発明は、翼と
発電機との間を二段式増速による増速機を介して連結し
た風力発電用風車において、低速段を遊星ローラ式トラ
クションドライブとし、高速段を平行軸トラクションド
ライブとし、これら低速段の出力軸と、高速段の入力軸
とを連結して増速機を構成してなるもので、これを課題
解決のための手段とするものである。また本発明は、翼
と発電機との間を二段式増速による増速機を介して連結
した風力発電用風車において、前記増速機として、低速
段を遊星ローラ式トラクションドライブとし、高速段を
平行軸歯車とし、これら低速段の出力軸と高速段の入力
軸とを連結して構成してなるものであり、更に前記増前
記増速機における高速段の平行軸歯車をヘリカルタイプ
としてなるもので、これを課題解決のための手段とする
ものである。SUMMARY OF THE INVENTION Therefore, the present invention provides a wind turbine for wind power generation, in which a blade and a generator are connected via a two-stage speed-increasing gearbox, in which a low-speed stage is provided with a planetary roller type traction. Drive, the high-speed stage is a parallel-axis traction drive, and the output shaft of the low-speed stage is connected to the input shaft of the high-speed stage to form a gearbox. Is what you do. The present invention also provides a wind turbine for wind power generation in which a wing and a generator are connected via a two-stage speed-increasing gearbox, wherein the low-speed stage is a planetary roller traction drive as the speed-increasing device. The stage is a parallel shaft gear, and the output shaft of the low speed stage and the input shaft of the high speed stage are connected to each other, and the parallel shaft gear of the high speed stage in the speed increaser is a helical type. This is a means for solving the problem.
【0005】[0005]
【作用】本発明は前記手段において、低速段において入
力軸の回転はリングローラの回転として遊星ローラを介
して太陽軸を増速して回転する。太陽軸からの出力はス
プラインカップリングを介して高速段のローラに伝わ
り、これと平行するローラを増速して回転させ、出力軸
から図示しない発電機を駆動する。このように高速段に
リングローラを使用しないで済むので、トラクション駆
動による疲労を防止するための油膜形成のためにローラ
表面を鏡面仕上げする部分を極力少なくでき、風力発電
風車の増速機に、低コストでしかも低騒音を維持したト
ラクションドライブ増速機を提供することができ、風車
全体の低コスト化と低騒音化が達成できる。According to the present invention, in the above means, the rotation of the input shaft in the low-speed stage is increased by rotating the sun shaft via the planetary roller as the rotation of the ring roller. The output from the sun shaft is transmitted to the high-speed roller via the spline coupling, and the roller parallel thereto is rotated at an increased speed to drive a generator (not shown) from the output shaft. Since it is not necessary to use a ring roller in the high-speed stage in this way, it is possible to minimize the portion of the roller surface to be mirror-finished for forming an oil film to prevent fatigue due to traction drive, and to increase the speed of a wind turbine, It is possible to provide a traction drive gearbox that is low in cost and maintains low noise, and can achieve low cost and low noise of the entire wind turbine.
【0006】[0006]
【実施例】以下本発明の実施例を図面について説明する
と、図1は本発明の第1実施例を示すもので、風力によ
り回転する翼からの回転N1 が低速段の入力軸4に伝え
られ、同入力軸4の回転はスプライン結合体21により
連結されたリングローラ10の回転となり、固定の低速
段キャリア22に突設された同方向に複数個配置された
遊星ローラピン12に軸支の遊星ローラ群11をトラク
ション駆動する。これら遊星ローラ′群11の回転は中
心部に配置された低速段太陽軸9をN3 に増速してトラ
クション駆動する。また同低速段の太陽ローラの回転N
3 をスプラインカップリング14を介して高速段の平行
軸15に伝える。同平行軸15に平行する相手平行軸5
が配置され、それぞれの軸は中央をローラ16,17と
され、相手平行軸のローラ17を支える軸受19に矢印
のようにローラ接触荷重20を加え、これらローラ1
6,17間に供給される潤滑油により油膜を形成して、
トラクション力を生み出し、出力軸5に所定の回転トル
クを伝達する。なお、低速段のリングローラ10は、前
記したようにブレード入力軸の傾きに追随できるように
スプライン結合21とし、また高速段における平行軸部
分の増速比は、ローラ16とローラ17の直径比率で決
まることはいうまでもない。EXAMPLES Hereinafter will be described an embodiment of the present invention the drawings, Figure 1 shows a first embodiment of the present invention, the rotation N 1 from a rotating blade by wind transmitted to the input shaft 4 of the low speed stage The rotation of the input shaft 4 becomes the rotation of the ring roller 10 connected by the spline coupling body 21, and a plurality of planetary roller pins 12 arranged in the same direction and protruding from the fixed low-speed carrier 22. The planetary roller group 11 is driven by traction. The rotation of the group of planetary rollers ′ drives the traction by increasing the speed of the low-speed sun shaft 9 arranged at the center to N 3 . The rotation N of the sun roller at the same low speed stage
3 is transmitted to the parallel shaft 15 of the high-speed stage via the spline coupling 14. The counterpart parallel axis 5 parallel to the parallel axis 15
Rollers 16 and 17 are provided at the center of each shaft, and a roller contact load 20 is applied to a bearing 19 supporting a roller 17 of a mating parallel shaft as shown by an arrow.
Forming an oil film by lubricating oil supplied between 6, 17;
It generates traction force and transmits a predetermined rotational torque to the output shaft 5. As described above, the ring roller 10 at the low speed stage is a spline coupling 21 so as to follow the inclination of the blade input shaft, and the speed increasing ratio of the parallel shaft portion at the high speed stage is the diameter ratio of the rollers 16 and 17. It goes without saying that it is determined by
【0007】また図2は本発明の第2実施例を示すもの
で、平行軸のローラ部分を前記第1実施例のもののよう
にローラ接触荷重20を必要としないようにして、平行
軸歯車噛合による増速部としたものであり、歯車噛合に
よる騒音を低減するためにヘリカル歯車とした場合は、
平行軸の軸受18,19をスラスト軸受としてスラスト
力を負担できるよにした。FIG. 2 shows a second embodiment of the present invention, in which the roller portion of the parallel shaft does not require a roller contact load 20 unlike the first embodiment, and the parallel shaft gear meshes. When the helical gear is used to reduce the noise due to gear meshing,
The parallel shaft bearings 18 and 19 are used as thrust bearings so as to bear the thrust force.
【0008】[0008]
【発明の効果】以上詳細に説明した如く、本発明は風力
発電用増速機における高速段をリングローラを使用せず
に平行軸トラクションドライブとすることで、トラクシ
ョン駆動による疲労を防止するための油膜形成のために
ローラ表面を鏡面仕上げする部分を極力少なくでき、増
速機全体の低騒音化を維持した状態でコスト低減を図る
ことができ、また高速段として平行軸トラクションドラ
イブを採用すると、各ローラ間に荷重を加える必要があ
るが、平行軸歯車を採用した場合では、この荷重を与え
る構造が不用になり、より装置が簡素化される。なお、
平行軸歯車の採用の場合は、歯車騒音の問題があるが、
ヘリカルタイプにすることでこれを低減してネックとな
らないレベルにすることができる。As described in detail above, the present invention uses a parallel shaft traction drive without using a ring roller for a high speed stage in a speed increaser for wind power generation, thereby preventing fatigue due to traction drive. The mirror surface finish of the roller surface for oil film formation can be reduced as much as possible, cost can be reduced while maintaining the noise reduction of the entire gearbox, and if a parallel shaft traction drive is adopted as a high speed stage, Although it is necessary to apply a load between the rollers, when a parallel shaft gear is employed, a structure for applying the load is unnecessary, and the apparatus is further simplified. In addition,
When using parallel shaft gears, there is a problem of gear noise,
By using a helical type, this can be reduced to a level that does not become a neck.
【図1】本発明の第1実施例に係わる遊星ローラ式トラ
クションドライブ増速機の縦断面図である。FIG. 1 is a longitudinal sectional view of a planetary roller type traction drive gearbox according to a first embodiment of the present invention.
【図2】本発明の第2実施例に係わる高速段側増速機の
縦断面図である。FIG. 2 is a longitudinal sectional view of a high-speed gearbox according to a second embodiment of the present invention.
【図3】従来の風車発電装置の概略側面図である。FIG. 3 is a schematic side view of a conventional wind turbine generator.
【図4】従来の風車発電用遊星ローラトラクションドラ
イブ増速機の縦断面図である。FIG. 4 is a longitudinal sectional view of a conventional planetary roller traction drive speed increasing device for wind turbine power generation.
【図5】従来のものの低速段側遊星ローラトラクション
ドライブの横断面図である。FIG. 5 is a cross-sectional view of a conventional low speed side planetary roller traction drive.
1 翼 2 増速機 3 発電機 4 ブレード入力軸 5 出力軸 6 ナセル 7 ブレード入力軸側軸受 8 タワー 9 低速段側太陽軸 10 リングローラ 11 遊星ローラ 12 遊星ローラピン 13 遊星ローラ用軸受 14 スプライン結合体 15 高速段側平行軸 16,17 ローラ 18 平行軸用軸受 19 出力軸側軸受 20 ローラ接触荷重 21 スプライン結合体(リングローラと入力軸との結
合) 22 低速段キャリアREFERENCE SIGNS LIST 1 blade 2 gearbox 3 generator 4 blade input shaft 5 output shaft 6 nacelle 7 blade input shaft side bearing 8 tower 9 low speed stage side sun shaft 10 ring roller 11 planetary roller 12 planetary roller pin 13 planetary roller bearing 14 spline assembly 15 High speed stage side parallel shaft 16, 17 Roller 18 Bearing for parallel shaft 19 Output shaft side bearing 20 Roller contact load 21 Spline assembly (coupling between ring roller and input shaft) 22 Low speed stage carrier
Claims (3)
速機を介して連結した風力発電用風車において、低速段
を遊星ローラ式トラクションドライブとし、高速段を平
行軸トラクションドライブとし、これら低速段の出力軸
と、高速段の入力軸とを連結して増速機を構成したこと
を特徴とする風力発電用増速機。In a wind turbine for wind power generation, wherein a blade and a generator are connected via a two-stage speed increaser, a low speed stage is a planetary roller type traction drive, and a high speed stage is a parallel shaft traction drive. A speed increaser for wind power generation, wherein an output shaft of the low speed stage and an input shaft of the high speed stage are connected to constitute a speed increaser.
速機を介して連結した風力発電用風車において、前記増
速機として、低速段を遊星ローラ式トラクションドライ
ブとし、高速段を平行軸歯車とし、これら低速段の出力
軸と高速段の入力軸とを連結して構成したことを特徴と
する風力発電用増速機。2. A wind turbine for wind power generation in which a blade and a generator are connected via a two-stage speed-increasing gearbox, wherein the low-speed stage is a planetary roller type traction drive as the speed-increasing device. A speed increaser for wind power generation, wherein the stages are parallel shaft gears, and the output shaft of the low speed stage is connected to the input shaft of the high speed stage.
をヘリカルタイプとしたことを特徴とする請求項2記載
の風力発電用増速機。3. The speed increaser for wind power generation according to claim 2, wherein a parallel shaft gear of a high speed stage in the speed increaser is of a helical type.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP02091494A JP3244913B2 (en) | 1994-02-18 | 1994-02-18 | Gearbox for wind power generation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP02091494A JP3244913B2 (en) | 1994-02-18 | 1994-02-18 | Gearbox for wind power generation |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07229471A JPH07229471A (en) | 1995-08-29 |
JP3244913B2 true JP3244913B2 (en) | 2002-01-07 |
Family
ID=12040497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP02091494A Expired - Fee Related JP3244913B2 (en) | 1994-02-18 | 1994-02-18 | Gearbox for wind power generation |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3244913B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20200076851A (en) | 2018-12-20 | 2020-06-30 | 전북대학교산학협력단 | Durability testing equipment for a large wind turbine generator |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10043593B4 (en) * | 2000-09-01 | 2014-01-09 | Renk Ag | Transmission for wind generators |
JP2006249982A (en) * | 2005-03-09 | 2006-09-21 | Mitsubishi Heavy Ind Ltd | Wind power generator |
JP5676293B2 (en) * | 2011-02-07 | 2015-02-25 | 住友重機械工業株式会社 | Wind speed booster |
KR101461807B1 (en) * | 2013-06-03 | 2014-11-13 | 박승동 | Speed Increaser of wind power generator |
KR101587737B1 (en) * | 2014-11-03 | 2016-01-22 | 박승동 | Vertical axis wind generator |
-
1994
- 1994-02-18 JP JP02091494A patent/JP3244913B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20200076851A (en) | 2018-12-20 | 2020-06-30 | 전북대학교산학협력단 | Durability testing equipment for a large wind turbine generator |
Also Published As
Publication number | Publication date |
---|---|
JPH07229471A (en) | 1995-08-29 |
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A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20011002 |
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