CN100396914C - Gearbox for wind turbine - Google Patents
Gearbox for wind turbine Download PDFInfo
- Publication number
- CN100396914C CN100396914C CNB2004100565770A CN200410056577A CN100396914C CN 100396914 C CN100396914 C CN 100396914C CN B2004100565770 A CNB2004100565770 A CN B2004100565770A CN 200410056577 A CN200410056577 A CN 200410056577A CN 100396914 C CN100396914 C CN 100396914C
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- Prior art keywords
- gear
- planetary pinion
- bearing
- load
- box
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Classifications
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- 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
Abstract
A wind turbine gear box having a compound planetary gear arrangement having bearings providing improved reliability and with greater accessibility for servicing. The gear box has planet pinions and planet gears being rotated by a planet carrier around a sun gear which drives a final reduction stage, the final reduction stage and the adjacent end of the planet carrier being removable from the gear box housing to allow easy removal of the planet pinions and their associated bearings.
Description
Technical field
The present invention relates to a kind of wind turbine, specifically, relate to a kind of gear-box that is set between wind turbine rotor and the generator.
Background technique
In response to the rotation of wind turbine rotor, it is known using epicyclic gearbox to drive generator.Rotor provides the input of low speed, high moment of torsion to gear-box.Gear-box provides at a high speed, hangs down moment of torsion output to generator.Such gear-box was used for this application about 20 years.Be well known that under this requirement was used, the planetary pinion of this gear-box and associated bearing bore high transverse load, thereby and bear high wearing and tearing, and inconvenient near carrying out maintenance, repairing and the replacing of those key abrasion elements.
Denomination of invention is that the U.S. Patent No. 6,420,808 of " wind-driven generator transmission device " has shown a kind of gear-box with the wind-drive motor.This gear-box comprises the multi-stage planetary gear transmission device and is used to drive the spur wheel level of exporting to generator.From the input driving gear corral of wind turbine rotor around rotational.The planetary pinion engagement of this gear ring and gear ring inside, and planetary pinion is in place at the housing internal fixation.The central gear that planet gear drives can be rotated around the central axis of gear-box, and this central gear drives the output shaft that links to each other with generator by one group of spur wheel.This gear-box is subjected to several restrictions, has reduced its operational reliability, and makes the repairing of key abrasion element and change more difficult.The planetary pinion 19 that is carried by planet pin 17 stretches out the adjacent outer bearing (just, being installed by cantilever with respect to these bearings) that is used for these.This be arranged on the outer and inner bearing produces the transverse force that has increased.In addition, inner bearing is narrower and have less internal diameter and external diameter than outer bearing, thereby with respect to outer bearing, has reduced its bearing capacity.The spatial constraints that caused by load-carrying ring 12 the inners, the minimizing of internal diameter and external diameter is essential.In addition, need disassemble whole gear-box near interior the maintenance with outer bearing.
As the U.S. Patent No. 6,148 that transfers General Electric jointly, shown in 940, also can learn and use epicyclic gearbox to be used for the particularly motor wheel of the employed vehicle of mining in the open of large-scale off-road vehicle.Motor with high speed, low moment of torsion output links to each other with the input shaft of gear-box.And described gear-box provides low speed, the output of high moment of torsion to wheel, turns a wheel.
U.S. Patent No. 5,663,600 have disclosed a kind of large-scale planet gear group that is used for the moment of torsion of pneumatic rotor is sent to axle/generator.This gear train comprises the gear ring that rotates with rotor.
Summary of the invention
According to the present invention, a kind of dual planetary gear case that is used to have the wind turbine of turbine blade and generator is provided, be used for and will rotate high speed, the low moment of torsion rotational power that power-converting becomes to be used to generate electricity from the low speed of turbine blade, high moment of torsion, described gear-box comprises:
Housing;
Gear ring in its internal fixation in described housing;
Planetary pinion load-bearing component, installation are used for rotating around central axis in described gear ring, and are suitable for being driven by turbine blade at its first end;
Second end of close described planetary pinion load-bearing component removably is fixed on the removable end cap on the described housing;
At a plurality of planetary pinions on the described planetary pinion load-bearing component, that be provided with on the described central axis spaced positions, the parallel axes of described planetary pinion is in the extension of central axis of described planetary pinion load-bearing component;
Respectively at first end and the first and second bearings second end place, that be used for described each planetary pinion of described planetary pinion, the end that is used to engage and support described planetary pinion makes it to rotate with respect to described planetary pinion load-bearing component;
A plurality of gear teeth on each planetary pinion, can and described gear ring engagement and between described first and second bearings;
At the planetary pinion on described each planetary pinion between first and second bearings;
Can around described central axis rotate and can with the central gear of described planetary pinion engagement; And
Drive and second end of contiguous described planetary pinion load-bearing component is removably mounted on final stage gear on the central gear by central gear; ,
All rotational powers from turbine blade are transmitted by described planetary pinion, and each planetary pinion is rotated by the bearings of locating at its two ends.
Preferably, each described planetary pinion has identical outer diameter at its first end with second end.
Preferably, the type of bearing that is used for each planetary pinion is identical, and has identical size.
Preferably, the outer diameter of each described bearing is the twice of the described outer diameter of described planetary pinion end.
Preferably, be used for the described clutch shaft bearing of each described planetary pinion first end by described planetary pinion load-bearing component joint and support; Also comprise the bearing support that at least one described relatively planetary pinion load-bearing component is provided with, be used to engage and support second bearing that is used for described planetary pinion second end.
Preferably, described at least one bearing support comprises the end plate that removably is fixed on described planetary pinion load-bearing component second end.
Preferably, under the situation that described final stage gear is pulled down from described housing, described at least one bearing support can be disassembled.
Preferably, under the situation under described at least one bearing block dismounting, second bearing at each described planetary pinion second end place can near and dismantled.
Preferably, under the situation that second bearing at the described planetary pinion second end place is disassembled, can dismantle near described planetary pinion.
Preferably, described gear-box also comprise can with the output pinion of described final stage gear engagement, the parallel axes of described output pinion is in the extension of central axis of described planetary pinion load-bearing component but be spaced from.
For example, the present invention includes the gear-box with one group of planetary pinion that is carried by the planetary pinion load-bearing component, the planetary pinion load-bearing component is by driving such as wind driving arrangements such as rotor blades.On each planetary pinion, form one group of gear teeth.Because its gear teeth and big fixing gear ring engagement, each planetary pinion rotates sooner than rotor.The planetary pinion that is installed on each planetary pinion drives rotation by corresponding planetary pinion.All planetary pinions and little central gear engagement and this little central gear of driving of being installed in rotation on the sun gear shaft that is provided on the planetary pinion load-bearing component central axis.Described central gear rotates quickly than big planetary pinion.Central gear drives a bigger final stage gear, and this final stage gear is mounted on the central gear by spline.One group of little gear teeth meshing on this final stage gear and the output pinion drives output pinion and rotates quickly than central gear.
Planetary gear bearing is positioned at every end place of each planetary pinion in its small gear and the planetary pinion outside, to support planetary pinion with respect to the planetary pinion load-bearing component.One end of planetary pinion load-bearing component links to each other with rotor and rotates with rotor, and the other end opens wide, with ccontaining planetary pinion.One load-bearing component end plate removably is fixed on the described planetary pinion load-bearing component.Clutch shaft bearing on each planetary pinion first end supports described planetary pinion by the planetary pinion load-bearing component.Second bearing on each planetary pinion second end supports described planetary pinion by the load-bearing component end plate.The output of gear box casing or final stage end are dismountable together with output pinion and final stage gear, thereby allow the described load-bearing component end plate of dismounting.The dismounting of described load-bearing component end plate allows to dismantle expediently the planetary gear bearing on planetary pinion second end.Then, can dismantle planetary pinion, succeeded by the planetary gear bearing of dismantling on planetary pinion first end from the planetary pinion load-bearing component.
Except when requiring to keep in repair, strengthened the accessibility of planetary bearing, planetary bearing of the present invention has also increased bearing capacity and reliability.Thus, the bearing on planetary pinion first and second ends has essentially identical size and bearing capacity (just having identical type and essentially identical width and internal diameter and external diameter).In addition, the external diameter of bearing approximately is the twice of its internal diameter, thereby the space of abundance is provided for high ability load-carrying unit.First and second bearings are set at the end of corresponding planetary pinion, and the gear teeth of planetary pinion and planetary pinion are between planetary gear bearing.Thereby planetary pinion by bearings, does not cause the overhanging or cantilever portion that increases stress along its whole length on bearing.
Description of drawings
By the detailed introduction of being carried out in conjunction with the accompanying drawings hereinafter, self will be better understood novel feature of the present invention and the present invention, and in the drawings, identical reference character is represented components identical.
Fig. 1 is the sectional view that comprises the wind turbine of the gear-box that meets one embodiment of the invention;
Fig. 2 is the perspective view of the input end of gear-box shown in Figure 1;
Fig. 3 is the perspective view of the output terminal of gear-box shown in Figure 1; And
Fig. 4 is the longitudinal profile view of gear-box shown in Figure 1.
Embodiment
Invention relates to a kind of wind turbine, and is particularly related to a kind of gear-box that is set between wind turbine rotor and the generator.The present invention is applicable to different gear box structures.Fig. 1 schematically illustrates the gear-box 10 that meets one embodiment of the invention.
Gear-box 10 forms the part of wind turbine 12.Wind turbine 12 comprises pillar or support 14.Support 14 supports turbine cylinder 16.Gear-box 10 is supported in the turbine cylinder 16.The size of gear-box 10 schematically shows by the profile that stands in the people in the wind turbine housing 16.
Gear-box 10 (Fig. 2～4) comprises the gear box casing of being made by several elements that removably tighten together or lid as shown in the figure 30.As shown in the figure, gear box casing 30 comprises input end cap 82, planetary pinion lid 84 and final stage lid 92.Gear box casing 30 utilizes supporting pin 32 to be supported on the turbine cylinder 16.
The input end cap 82 support planetary gears load-bearing components 40 of gear box casing 30 also center on planetary pinion load-bearing component 40 (Fig. 4) extension, and planetary pinion load-bearing component 40 is used for rotating with respect to housing 30 around the central axis 36 of planetary pinion load-bearing component 40.Input hub 34 on first end of planetary pinion load-bearing component 40 adopts the suitable mode of not showing to link to each other with rotor shaft 22, rotates with rotor 20.Import the rotatory force that hub 34 receives from rotor 20, and planetary pinion load-bearing component 40 is rotated with respect to gear box casing 30 in response to this rotatory force.As shown in the figure, second end of planetary pinion load-bearing component 40 opens wide basically, and removably the end plate 88 of An Zhuaning is attached on second end of planetary pinion load-bearing component 40.As mentioned below, this dismountable load-bearing component end plate 88 is as the planet pin bearing.
Planetary pinion load-bearing component 40 supports a plurality of planetary pinions 42 around 36 orbitings of load-bearing component axis thereon.In the embodiment shown, 3 planetary pinions of opening around load-bearing component axis 36 equally-spaced 42 are set, in Fig. 4, only show a planetary pinion 42.Bearings planetary pinion 42 is so that rotate with respect to the planetary pinion load-bearing component.Specifically, be installed in first end that first planetary gear bearing 46 on planetary pinion load-bearing component 40 first ends engaged and supported each planetary pinion 42, directly support this end of this planetary pinion 42 by planetary pinion load-bearing component 40.Second planetary gear bearing 48 that is installed on the planetary pinion load-bearing component end plate 88 engages and supports second end of each planetary pinion 42, thereby supports second end of this planetary pinion 42 indirectly by planetary pinion load-bearing component 40.Each planetary pinion 42 has a plurality of external gear gear teeth 44, and in the embodiment shown, described external gear teeth 44 is teeth of spur gears.The planetary pinion gear teeth 44 can be the spiral gear gear teeth in addition.
Gear-box 10 comprises gear ring 50.Gear ring 50 is fixed on the inside of gear box casing 30.As shown in the figure, the diameter of gear ring 50 roughly is 127 centimetres (50 inches).The diameter of planetary pinion 42 is significantly littler than the diameter of gear ring 50.
Gear-box 10 comprises a plurality of planetary pinions 54, and the quantity of planetary pinion 54 is identical with the quantity of planetary pinion 42.Therefore in the embodiment shown, 3 planetary pinions 54 are set, in the sectional view of Fig. 4, only show one.
Each planetary pinion 54 is fixed on the planetary pinion 42, thereby rotates with the planetary pinion 42 that is associated.Thereby gear-box 10 is " compound " epicyclic gearboxes.Therefore when input hub 34 and 40 rotations of planetary pinion load-bearing component, by planetary pinion 42, the rotatory force of input hub 34 is sent on the planetary pinion 54 fully, rotates around the planetary pinion axis to drive this planetary pinion.
The diameter of planetary pinion 54 is significantly bigger than the diameter of planetary pinion 42.Each planetary pinion 54 has a plurality of external gear gear teeth 56, and in the embodiment shown, the external gear gear teeth 56 are teeth of spur gears.In addition, the planetary pinion gear teeth 56 can be the spiral gear gear teeth.If the planetary pinion gear teeth 56 and planetary pinion 42 gear teeth are spiral, they are designed to inclination roughly the same but that direction is opposite, thereby their corresponding end thrusts are cancelled out each other.
Gear-box 10 also comprises the central gear 60 that is installed in the planetary pinion load-bearing component 40, is centered on by planetary pinion 42.The sun gear shaft 96 that central gear 60 is installed on the final stage lid 92 on the gear box casing 30 supports, and is used for rotating with respect to gear box casing 30 around central axis 36.The diameter of central gear 60 is significantly littler than the diameter of planetary pinion 54.
Gear-box 10 also comprises final stage 90, and final stage 90 comprises final stage end plate 94, final stage lid 92, output pinion 70 and final stage gear 62.Final stage gear 62 is spur wheel or spiral gear, connects 64 by the spline on the central gear 60 and fixedly is used for rotating around sun gear shaft 96 with central gear 60.The diameter of final stage gear 62 is significantly bigger than the diameter of central gear 60.Final stage gear 62 has a plurality of outer spur wheels or the spiral gear gear teeth 66.
The gear teeth 72 on the output pinion 70 and 66 engagements of the external gear gear teeth on the final stage gear 62.Thereby the rotatory force of the rotor 20 that transmits by input hub 34, planetary pinion load-bearing component 40, planetary pinion 42, planetary pinion 54 and central gear 60 is transmitted to output pinion 70 by final stage gear 62.The rotating drive generator 26 of output pinion 70, thus electric energy produced.
Gear-box 10 provides gear reduction, and in described embodiment, for example described reduction speed ratio can be 72: 1 (72 to 1).To should be in the wind motion by wind turbine 12, rotor 20 low speed and large torques rotate.The low speed of rotor 20, the input of high moment of torsion are converted to the high speed that is suitable for driving generator 26, low moment of torsion output by gear-box 10.
Thereby the input torque from rotor 20 and input hub 34 is being assigned with between three planetary pinions 54 between three planetary pinions 42, so that send central gear 60 to.The high moment of torsion that this structure will be rotated input element 34 to be provided disperses between a plurality of transfer paths.Wherein all moments of torsion in train of gearings concentrate on the only point on a gear and the path, the position of central gear 60 just, because that central gear rotates is faster, torque value is significantly less than input torque.Adopt this mode, all input torques are born at the neither one position on the train of gearings of gear-box 10.This helps to increase the serviceability and the reliability of gear-box 10 internal tooth trains.
Not direct and central gear 60 engagements with the planetary pinion 42 of gear ring 50 engagements.But planetary pinion 42 rotates planetary pinion 54, and planetary pinion 54 is with central gear 60 engagements and central gear 60 is rotated.Therefore, the gear teeth 44 on planetary pinion 44 do not have alternating bending (reverse bending), and if planetary pinion is set directly between gear ring 50 and the central gear 60, alternating bending may appear.Thereby the elimination of alternating bending helps to increase the life-span of planetary pinion 42 and the reliability of gear-box 10.
From Fig. 4, can also see, the final stage portion 90 that comprises the gear-box 10 of final stage end plate 94, final stage lid 92, output pinion 70 and final stage gear 62 be can from gear-box 10 dismountings (in fact, as the dismounting of single unit), thus load-bearing component end plate 88 is exposed.So load-bearing component end plate 88 can expose the planetary gear bearing 48 on planetary pinion 42 second ends from second end (or open end) dismounting of planetary pinion load-bearing component 40, is convenient to dismounting.After this, the planetary gear bearing 46 on planetary pinion 42 and planetary pinion 42 first ends can be disassembled.
Compared with prior art, dual planetary gear case 10 of the present invention can provide higher power output (under the identical speed, bigger moment of torsion) from the gear-box that occupies the same space volume.In addition, can provide identical power output from less spatial volume.In addition, gear-box 10 of the present invention makes more easily near planetary pinion and planetary gear bearing, so that maintenance.
Since interior bear similar load pattern with outer bearing and have basic similar bearing capacity essentially identical reliability and identical service request are provided, planetary gear bearing provides the reliability that has improved.Thus, first end of planetary pinion 42 and the bearing on second end 46,48 have essentially identical size and bearing capacity (just they are same types, and have essentially identical width and inner and outer diameter).In addition, the outer diameter of these bearings roughly is the twice of internal diameter, thereby provides sufficient space for high ability load-bearing component.First and second bearings are positioned at the end of corresponding planetary pinion, and the planetary pinion gear teeth 52 and planetary pinion 54 are between these planetary gear bearings.Thereby planetary pinion 42 by bearings, does not cause the overhanging or cantilevered leg position that increases stress along its whole length on bearing.
Can fully obtain previously described purpose and previously described advantage is provided though illustrate here, should be appreciated that this openly only just illustrates currently preferred embodiments of the invention, does not constitute other restriction of the present invention with detailed disclosed specific invention.
Claims (10)
1. a dual planetary gear case that is used to have the wind turbine of turbine blade and generator is used for and will rotates high speed, the low moment of torsion rotational power that power-converting becomes to be used to generate electricity from the low speed of turbine blade, high moment of torsion, and described gear-box comprises:
Housing (30);
Gear ring (50) in its internal fixation in described housing (30);
Planetary pinion load-bearing component (40), installation are used for rotating around central axis (36) in described gear ring (50), and are suitable for being driven by turbine blade at its first end;
Second end of close described planetary pinion load-bearing component (40) removably is fixed on the removable end cap (92) on the described housing (30);
At a plurality of planetary pinions (42) on the described planetary pinion load-bearing component (40), that be provided with on described central axis (36) spaced positions, the parallel axes of described planetary pinion is extended in the central axis (36) of described planetary pinion load-bearing component;
Respectively at first end and first and second bearings (the 46 second end place, that be used for described each planetary pinion (42) of described planetary pinion, 48), the end that is used to engage and support described planetary pinion makes it to rotate with respect to described planetary pinion load-bearing component (40);
A plurality of gear teeth (44) on each planetary pinion (42) can mesh with described gear ring (50) and be positioned between described first and second bearings (46,48);
Planetary pinion (54) on described each planetary pinion (42) that is positioned between first and second bearings (46,48);
Can around described central axis (36) rotate and can with the central gear (60) of described planetary pinion (54) engagement; And
Drive and second end of contiguous described planetary pinion load-bearing component (40) is removably mounted on final stage gear (62) on the central gear (60) by central gear (60); ,
All rotational powers from turbine blade are transmitted by described planetary pinion (42), and each planetary pinion is rotated by the bearings of locating at its two ends.
2. gear-box according to claim 1, it is characterized in that: each described planetary pinion (42) has identical outer diameter at its first end with second end.
3. as gear-box as described in the claim 2, it is characterized in that: the type of bearing (46,48) that is used for each planetary pinion (42) is identical, and has identical size.
4. as gear-box as described in the claim 3, it is characterized in that: the outer diameter of each described bearing (46,48) is the twice of the described outer diameter of described planetary pinion (42) end.
5. gear-box according to claim 1, it is characterized in that: the described clutch shaft bearing (46) that is used for each described planetary pinion (42) first end is engaged and is supported by described planetary pinion load-bearing component (40); Also comprise the bearing support that at least one described relatively planetary pinion load-bearing component (40) is provided with, be used for second bearing (48) that joint and support are used for described planetary pinion (42) second ends.
6. as gear-box as described in the claim 5, it is characterized in that: described at least one bearing support comprises the end plate (88) that removably is fixed on described planetary pinion load-bearing component (40) second ends.
7. as gear-box as described in the claim 5, it is characterized in that: under the situation that described final stage gear (62) is pulled down from described housing (30), described at least one bearing support can be disassembled.
8. as gear-box as described in the claim 7, it is characterized in that: under the situation under described at least one bearing block dismounting, second bearing (48) at each described planetary pinion (42) second end place can near and dismantled.
9. as gear-box as described in the claim 8, it is characterized in that: under the situation that second bearing (48) at described planetary pinion (42) second end places is disassembled, can dismantle near described planetary pinion.
10. gear-box according to claim 1, it is characterized in that: also comprise can with the output pinion (70) of described final stage gear (62) engagement, the central axis (36) that the axis of described output pinion (74) is parallel to described planetary pinion load-bearing component (40) extends but is spaced from.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/778,583 | 2004-02-12 | ||
| US10/778,583 US7008348B2 (en) | 2003-02-18 | 2004-02-12 | Gearbox for wind turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1654819A CN1654819A (en) | 2005-08-17 |
| CN100396914C true CN100396914C (en) | 2008-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100565770A Expired - Fee Related CN100396914C (en) | 2004-02-12 | 2004-08-10 | Gearbox for wind turbine |
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| Country | Link |
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| CN (1) | CN100396914C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7935020B2 (en) * | 2007-08-27 | 2011-05-03 | General Electric Company | Integrated medium-speed geared drive train |
| CN102057188A (en) * | 2008-07-03 | 2011-05-11 | 迪尔公司 | Transmission gear ratio changing without disassembly for a work machine |
| EP2630367B1 (en) * | 2010-10-18 | 2015-06-03 | Vestas Wind Systems A/S | Wind turbine power transmission system and method of installing a wind farm including same |
| GB201104455D0 (en) * | 2011-03-16 | 2011-04-27 | Romax Technology Ltd | Cover and sealing arrangements for a wind turbine gearbox |
| US11536361B2 (en) * | 2018-03-08 | 2022-12-27 | General Electric Company | Modular gearbox for wind turbine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6117036A (en) * | 1999-07-29 | 2000-09-12 | New Venture Gear, Inc. | Split helical planetary gear assembly |
| US6176804B1 (en) * | 1998-06-18 | 2001-01-23 | Valmet Voimansiirto Oy | Planetary gear train for a wind power station |
| US6420808B1 (en) * | 1999-04-19 | 2002-07-16 | Renk Aktiengesellschaft | Gearing for wind generators |
| JP2003269553A (en) * | 2002-03-15 | 2003-09-25 | Kanzaki Kokyukoki Mfg Co Ltd | Speed increase device for wind power generator |
| CN2580136Y (en) * | 2002-11-13 | 2003-10-15 | 沈阳工业大学 | Variable speed constant frequency wind motor unit speeder |
-
2004
- 2004-08-10 CN CNB2004100565770A patent/CN100396914C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6176804B1 (en) * | 1998-06-18 | 2001-01-23 | Valmet Voimansiirto Oy | Planetary gear train for a wind power station |
| US6420808B1 (en) * | 1999-04-19 | 2002-07-16 | Renk Aktiengesellschaft | Gearing for wind generators |
| US6117036A (en) * | 1999-07-29 | 2000-09-12 | New Venture Gear, Inc. | Split helical planetary gear assembly |
| JP2003269553A (en) * | 2002-03-15 | 2003-09-25 | Kanzaki Kokyukoki Mfg Co Ltd | Speed increase device for wind power generator |
| CN2580136Y (en) * | 2002-11-13 | 2003-10-15 | 沈阳工业大学 | Variable speed constant frequency wind motor unit speeder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1654819A (en) | 2005-08-17 |
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Owner name: ZF WIND POWER ANTWERPEN NV Free format text: FORMER OWNER: GENERAL ELECTRIC CO. Effective date: 20141028 |
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