CN1888471A - Gearbox for wind generator - Google Patents

Abstract

The invention adopts a compound planet-gear arrangement and a two-stage parallel-axis gearing. Three or four planet gears mesh with the solar wheel gear-teeth on the central axis of the gearbox, and also mesh with the solar wheel barreled tooth flank, which meshes with the internal teeth of the floating geared sleeve. The external teeth of the floating geared sleeve mesh with the low-speed gears, which meshes with the intermediate gears meshed with the high-speed gears. The planet gears are supported via a bearing and a carrier member (reach) mounted on the planet external frame. The planet external frame is integrated with the planet internal frame via the pins.

Description

The gear-box of wind generating unit

Technical field

The present invention relates to a kind of wind generating unit, specifically, is a kind of step-up gear that is installed between wind generating unit main shaft and the generator.

Background technique

For the rotation of wind generating unit main shaft, it is known driving generator by the planet step-up gear.Main shaft 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.The gear-box of the type was used for wind generating unit about more than 20 years.As everyone knows, under applying working condition, the planetary pinion of this gear-box and associated bearing bear higher radial load and impact load, again because of bearing film is difficult for setting up, so the bearing operation conditions is abominable.In view of maintenance, repairing and the replacing of inconvenience to those key abrasion elements, so that the functional reliability of gear-box is being born acid test.For this reason, the claimant has designed and has applied for preposition patent: " assembly planetary carrier for wind power " (application number: 200510022381.4) the quasi-solution reliability of gear-box planetary pinion transmission of determining.

Summary of the invention

The objective of the invention is to overcome prior art above shortcomings part, design that performance is more outstanding, the gear-box of reliable wind generating unit.

The present invention includes the interior gear-box of installing of frame, frame that existing tower tube supports, fan blade and wheel hub link to each other with the input end of gear-box by main shaft, the output terminal of gear-box links to each other with generator by coupling, promptly adopt dual planetary gear to arrange and add the two-stage parallel axis gear transmission, sun gear engagement on three or four planetary pinions and the gear-box central axis, sun gear crowned teeth and the engagement of unsteady tooth cover internal tooth, the tooth that floats overlaps external tooth and speed stage gear mesh, slow speed turbine stage gear and middling speed level gear engagement, middling speed level gear and high speed level gear engagement; Planetary pinion supports by bearing, load-bearing component (axle), load-bearing component (axle) is installed on the planetary outer frames, planetary outer frames is formed one by pin and planetary inner frames, planetary outer frames only contacts by annular junction plane in the intermediate portion with planetary inner frames, other position is unsettled, and planetary inner frames links to each other with main shaft by shrink disk.

Described a plurality of planetary load-bearing components (axle) drive the corresponding planetary pinion that rotates around central axis by bearing, planetary pinion and ring gear, sun gear mesh simultaneously, main shaft power passes on the sun gear by planet wheel, and planet wheel is around the central axis revolution, around its back shaft axis rotation.

The external tooth of described unsteady tooth cover and the engagement of low speed hollow shaft internal tooth, driving low speed gear, low speed gear by bearings on casing.

Described gear-box also comprises middling speed level and high speed level gear, the middling speed level is by middling speed level gear shaft and the middling speed level small gear gear teeth, the middling speed gearwheel gear teeth, bearing, middling speed level small gear and the engagement of slow speed turbine stage gear external tooth, middling speed level gearwheel and high speed level pinion, the final stage of gear-box is made up of high speed gear shaft, the gear teeth, bearing and output shaft, middling speed level gearwheel and high speed level gear engagement are by the high speed shaft outputting power.

Described planetary pinion is spaced apart around central axis.

Described sun gear, ring gear, planet wheel all adopt straight-tooth.

Advantage of the present invention is: adopt combinations thereof formula structure, no matter the torque of input, the planetary inner frames connecting plate produces great torsional deflection, is contained in the shaft axis of planetary outer frames upper planet axle, all incites somebody to action all the time and central gear axis keeping parallelism.Thereby reduced the unbalance loading of gear and the distribution inequality of planet wheel middle (center) bearing load greatly, improved the reliability of bearing and gear; For the sun gear crowned teeth, because by tooth cover and the speed stage gear mesh of floating, can reduce that gear and planet carrier support that transmitting element such as axis hole causes owing to manufacturing, alignment error three or four planetary pinions and shaft strength are inhomogeneous, reduced the added impact load of gear-box, gear contact and shaft strength have been improved, adopt described technology, the functional reliability and the life-span of planetary pinion and bearing have been improved greatly, the functional reliability and the life-span of also having improved other gears and bearing simultaneously.Above-mentioned two technology have constituted core of the present invention.

Description of drawings

Fig. 1 is the cross-sectional schematic with the wind generating unit of the supporting gear-box of the present invention.

Fig. 2 is the enlarged view of overlooking of Fig. 1 middle gear case (10).

Fig. 3 is vertical cutaway view Amplified image of Fig. 1 middle gear case (10).

Code name implication among the figure: 10 gear-boxes, 11 tower cylinder 12 frames, 20 fan blades and wheel hub 21 main shafts 22 shaft couplings 23 generators 30 casings 31 supporting pins 32 central axis 33 planetary inner frames 34 shrink disk 40 ring gears 41 planetary outer frames 42 pins 43 planetary gears 44 gear teeth 45 bearings 46 planetary gear load bearing components (axle) 47 axis 50 sun gears 51 sun gear barreled tooth flanks 60 unsteady teeth overlap the outer gear teeth 80 intermediate gear axles 81 intermediate gear pinion gear teeth 82 intermediate gear gear teeth of bull gears 83 bearings 84 bearings 90 high speed gear shafts 91 high gear wheel shafts 92 bearings 93 bearings 94 output shafts of 70 slow speed turbine stage gears, 71 bearings, 72 bearings, 73 slow speed turbine stage gears; The different function block of each section of code name representative is a unit with ten among the figure.

Embodiment

With reference to Fig. 1-Fig. 3, wherein Fig. 1 schematically illustrates the gear-box 10 that meets an embodiment of the present invention, and the size of this gear-box only schematically shows.

The present invention includes that existing tower tube 11 supports wind generating unit frames 12, gear-box 10 is supported in the frame 12, fan blade and wheel hub 20 link to each other with the input end of gear-box 10 by main shaft 21, and the output terminal of gear-box 10 links to each other with generator 23 by coupling 22.Promptly adopt dual planetary gear 43 to arrange and add the two-stage parallel axis gear transmission, sun gear 50 gear teeth meshing on three or four planetary pinions 43 and gear-box 10 central axis 32 also drive sun gear crowned teeth 51, and sun gear 50 rotates faster than planetary pinion 43.Sun gear crowned teeth 51 is overlapped the engagement of 60 internal tooths with unsteady tooth, unsteady tooth overlaps 60 external tooths and 70 engagements of slow speed turbine stage gear, slow speed turbine stage gear 70 and middling speed level gear engagement, middling speed level gear and high speed level gear engagement, be that sun gear crowned teeth 51 drives slow speed turbine stage gear 70 by the unsteady tooth cover 60 with its engagement, drive intermediate gear by slow speed turbine stage gear 70, drive high gear by intermediate gear again, thereby output shaft 94 is rotated quickly.Planetary pinion 43 supports by bearing 45, load-bearing component (axle) 46, load-bearing component (axle) 46 is installed on the planetary outer frames 41, planetary outer frames 41 is formed one by pin 42 and planetary inner frames 33,33 of planetary outer frames 41 and planetary inner frames contact by annular junction plane in the intermediate portion, other position is unsettled, and planetary inner frames 33 links to each other with main shaft 21 by shrink disk 34.The tooth that floats overlaps 60 external tooth and the engagement of low speed hollow shaft internal tooth, drives low speed gear 70, and low speed gear 70 is supported on the casing 30 by bearing 71,72.Gear-box 10 also comprises middling speed level and high speed level gear, the middling speed level is made up of middling speed level gear shaft 80 and the middling speed level small gear gear teeth 81, the middling speed gearwheel gear teeth 82, bearing 83 and bearing 84, middling speed level small gear 81 rotates with 91 engagements of high speed level small gear with slow speed turbine stage gear external tooth 73 engagements, middling speed level gearwheel 82.The final stage of gear-box 10 is made up of high speed gear shaft 90, the high gear gear teeth 91, bearing 92, bearing 93 and output shaft 94, and high speed gear shaft 90 is meshed by the high gear gear teeth 91 and the intermediate gear gearwheel gear teeth 82 and produces moment of torsion, by output shaft 94 outputs.Sun gear 50, ring gear 40, planet wheel 43 all adopt straight-tooth.High speed gear shaft 90 has the output shaft 94 that stretches out outside the gear box casing 30, is used for linking to each other with generator 23 via coupling 22, carries out rotating drive, thereby produces electric power by generator.

Be installed in fan blade on the wind generating unit and wheel hub 20 and rotated by wind blows, its rotatory force is transferred to generator 23 by main shaft 21, gear-box 10 and coupling 22, produces electric power by generator 23.The casing 30 of gear-box 10 utilizes supporting pin 31 to be supported on the frame 12 of wind generating unit.Planetary pinion load-bearing component (axle) 46 rotates around the central axis 32 of planetary inner frames 33.The rotatory force that planetary inner frames 33 is accepted from fan blade and wheel hub 20, and with planetary outer frames 41 rotations that distribution 42 is fixed together, rotate thereby drive the planetary pinion load-bearing component (axle) 46 that is installed on the planetary outer frames 41.A plurality of planetary carryings are carried parts (axle) 46 and are driven the corresponding planetary pinion 43 that rotates around central axis 32 by bearing 45, planetary pinion 43 meshes simultaneously with ring gear 40, sun gear 50, main shaft 21 power pass on the sun gear 50 by planet wheel, and planet wheel is around central axis 32 revolution, around its back shaft axis 47 rotations.In described example, 3 planetary pinions of uniformly-spaced separating around central axis 32 43 are set, in Fig. 3, only shown a planetary pinion 43.Each planetary pinion 43 has a plurality of gear teeth 44, and in the example shown, the described external gear gear teeth 44 are through ship teeth.

Because planetary carrying is carried parts (axle) 46 and is mounted on the planetary outer frames 41, and planetary outer frames 41 is to link together by pin 42 and planetary inner frames 33.So the rotation of planetary inner frames 33 is sent to planetary outer frames 41 by pin 42.Like this, guarantee that the axis 47 of planetary pinion 43 is parallel with central axis 32, thereby avoided planetary carrying to carry the deflection of parts (axle) 46 and the flank of tooth deflection that produces.Sun gear 50 is by the internal tooth engagement of sun gear crowned teeth 51 with unsteady tooth cover 60, and the external tooth of the tooth cover 60 that floats and the engagement of low speed hollow shaft internal tooth drive slow speed turbine stage gear 70.Slow speed turbine stage gear 70 is supported on the casing 30 by bearing 71 and bearing 72.For planet wheel and inhomogeneous the reaching of shaft strength that minimizing manufacturing, alignment error cause are added impact load, also reduce simultaneously the additional impact load on the gear 70, tooth cover 60 to be improving contact and the stressed uniformity between the gear tooth so adopt to float, thereby the functional reliability of gear-box 10 and working life are improved greatly.As can be seen from Figure 3, planetary inner frames 33, planetary outer frames 41, pin 42, parts (axle) 46 are carried in planetary carrying, and planetary pinion 43, sun gear 50, unsteady tooth overlap common combination such as 60 parts such as grade, thereby have produced " floating " technology.Make the stressed more even of low speed gear part and associated bearings thereof, the between cog contact is better.In view of the planetary pinion and the associated bearing of existing gear-box technology bears higher radial load and impact load, adopt " floating " of the present invention technology after, can improve the reliability of gear-box greatly.

Can fully obtain previously described purpose and previously described advantage is provided though illustrate here, should be appreciated that the present invention is not limited only to this embodiment with detailed disclosed specific invention.

Claims (5)

1. the gear-box of a wind generating unit, comprise the frame that the tower tube supports, the gear-box of installing in the frame, fan blade and wheel hub link to each other with the input end of gear-box by main shaft, the output terminal of gear-box links to each other with generator by coupling, it is characterized in that: adopt dual planetary gear to arrange and add the two-stage parallel axis gear transmission, sun gear gear teeth meshing on three or four planetary pinions and the gear-box central axis, and cooperate with the sun gear crowned teeth, the sun gear crowned teeth is by cooperating with the unsteady tooth cover of its engagement, the tooth that floats overlaps and speed stage gear mesh, slow speed turbine stage gear and middling speed level gear engagement, middling speed level gear and high speed level gear engagement; Planetary pinion supports by bearing, planet axis, planet axis is installed on the planetary outer frames, and planetary outer frames is formed one by pin and planetary inner frames, and planetary outer frames only contacts by annular junction plane in the intermediate portion with planetary inner frames, other position is unsettled, and planetary inner frames links to each other with main shaft by shrink disk.

2. the gear-box of wind generating unit as claimed in claim 1, it is characterized in that: the combined planetary frame carries parts by carrying and bearing drives the corresponding planetary pinion that rotates around central axis, planetary pinion and ring gear, sun gear mesh simultaneously, main shaft power passes on the sun gear by the planet wheel internal gear, and planet wheel is around the central axis revolution, around its back shaft axis rotation.

3. the gear-box of wind generating unit as claimed in claim 1, it is characterized in that: the internal tooth of the tooth cover that floats and the crowned teeth engagement of sun gear, its external tooth simultaneously again with the engagement of low speed hollow shaft internal tooth, drive low speed gear, low speed gear by bearings on casing.

4. the gear-box of wind generating unit as claimed in claim 1 is characterized in that: lower velocity shaft gearwheel and middling speed axle pinion, and middling speed axle gearwheel and high speed shaft pinion, power is exported by high speed shaft.

5. the gear-box of wind generating unit as claimed in claim 1 is characterized in that: planetary pinion is spaced apart around central axis.

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