CN202194789U - Gear box of wind turbine and power input assembly of gear box - Google Patents
Gear box of wind turbine and power input assembly of gear box Download PDFInfo
- Publication number
- CN202194789U CN202194789U CN2011203350047U CN201120335004U CN202194789U CN 202194789 U CN202194789 U CN 202194789U CN 2011203350047 U CN2011203350047 U CN 2011203350047U CN 201120335004 U CN201120335004 U CN 201120335004U CN 202194789 U CN202194789 U CN 202194789U
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- China
- Prior art keywords
- internal spline
- power input
- input assembly
- baffle plate
- wind
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- 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
Abstract
The utility model discloses a power input assembly of a gear box of a wind turbine. The power input assembly comprises an input shaft (3), an annular gear (1) and an internal spline (2), wherein the internal spline (2) clings to the top surface of the annular gear (1), an external spline at the bottom end of the input shaft (3) is connected with the internal spline (2) in a matching way, a clamping groove is arranged on the circumferential wall of the input shaft (3), a baffle (4) inserted in the clamping groove clings to the top surface of the internal spline (2); the annular gear (1) is connected with the internal spline (2) by upright socket head screws (51), and the top surfaces of the socket head screws (51) are lower than that of the internal spline (2); the baffle (4) is connected with the internal spline (2) by upright socket head cap bolts (52). The power input assembly has safe and reliable connection and better anti-loosening effect, and the operational reliability is improved. The utility model also discloses a gear box comprising the power input assembly, and the gear box has the corresponding technical effects.
Description
Technical field
The utility model relates to technical field of wind power generation, relates in particular to a kind of wind-driven generator wheel-box and power input assembly thereof.
Background technique
Along with non-renewable energy resources reduce gradually, energy unit price is increasingly high, renewable energy sources particularly wind energy power technology field more and more receives people's attention.In wind power generating set, an of paramount importance constituent element is a step-up gear, and along with the increase of separate unit electric motor power, the volume of step-up gear also constantly increases, structural design also becomes increasingly complex, particularly the structural design of gear ring floating load balancing.
For reaching the effect of gear ring floating load balancing, on the big end cylndrical surface of input shaft, design external splines usually, design internal spline on the ring gear, input shaft is connected through spline with ring gear., transmitted power one timing constant in other conditions, the facewidth size of ring gear is directly proportional with the transmitted power size, and the power that promptly transmits is big more, and the facewidth of ring gear is wide more.
Please refer to Fig. 1, Fig. 2 and Fig. 3, Fig. 1 is the structural representation of ring gear assembly in the power input assembly of wind-driven generator wheel-box in the existing technology; Fig. 2 is the left view of Fig. 1; Fig. 3 is the erection drawing of existing technology medium power input assembly.
The facewidth of the ring gear assembly of wind-driven generator wheel-box is usually less than 500mm in the existing technology; As shown above; This ring gear assembly comprise ring gear 1 ' with internal spline 2 ', because 500mm is in current gear working machine tool processing travel range, therefore usually with ring gear 1 ' with a part of internal spline 2 ' make; After processing profile of tooth; The form of the whole facewidth through the turning groove is divided into the required engagement facewidth and the internal spline facewidth, and in internal spline 2 ' exterior edge face inside tapped hole 21 is set ', the internal spline 2 that subsequently input shaft 3 ' axially insert is made its external splines and ring gear 1 ' assembly ' be connected; Again baffle plate 4 ' applying is arranged at internal spline 2 ' exterior edge face; Through be located at above-mentioned a plurality of tapped hole 21 ' in a plurality of screws 22 ' with internal spline 2 ' with baffle plate 4 ' be connected because baffle plate 4 ' be plugged in input shaft 3 ' draw-in groove in, and then play the effect of restriction input shaft 3 ' axial displacement.This structure can realize input shaft 3 ' with ring gear 1 ' radially fixing and axial restraint, thereby guarantee the transmission of gear-box power.
Yet along with the power that gear-box transmits is increasing, the facewidth of ring gear assembly also increases to more than the 500mm thereupon; The current gear working machine tool can not be processed so big gear of the facewidth, therefore must ring gear and internal spline be made two independent parts, and is as shown in Figure 4; This figure is the structural representation that the facewidth surpasses the ring gear assembly of 500mm, obviously, if existing technology is still imitateed in the connection between the input shaft of the ring gear of this structure 1, internal spline 2 and gear-box; Adopt a stay bolt coupling shaft to connecting the three; This stay bolt not only can bear tensile stress, also bears shearing stress simultaneously, and not only anti-loosing effect is bad; Also can make bolt get into fatigue stage too early, reliability reduces greatly.Therefore, how to connect ring gear assembly and input shaft that the facewidth surpasses 500mm, the three is connected have anti-loosing effect preferably, become the vital problem that influences the gear-box working stability.
In view of this; Demand urgently to above-mentioned technical problem; Look for another way to comprising that the facewidth surpasses the Placement of its power input assembly of gear box designs of the ring gear assembly of 500mm; Make being connected that ring gear, internal spline and the input shaft of this power input device can be safe and reliable to have anti-loosing effect preferably, guarantee the transmission of power of wind-driven generator wheel-box.
The model utility content
The technical problem that the utility model will solve is to provide a kind of facewidth that comprises to surpass the power input assembly of wind-driven generator wheel-box of the ring gear assembly of 500mm; Its ring gear, internal spline and input shaft can be safe and reliable be connected; Have anti-loosing effect preferably, guarantee the transmission of power of wind-driven generator wheel-box.The utility model also provides a kind of wind-driven generator wheel-box that comprises above-mentioned power input assembly.
For solving the problems of the technologies described above; The utility model provides a kind of power input assembly of wind-driven generator wheel-box; Comprise input shaft, ring gear and fit in the internal spline of said ring gear end face; The external splines and the said internal spline of said input shaft bottom are connected, and said input shaft periphery wall is provided with draw-in groove, and said internal spline end face is fitted with the baffle plate that is plugged in the said draw-in groove; Said ring gear is connected through vertical interior angle screw with said internal spline, and the end face of said interior angle screw is lower than the end face of said internal spline; Said baffle plate is connected through vertical outer corner bolt with said internal spline.
Preferably, also comprise limit position part, said limit position part bottom shape and said interior angle screw head groove shapes are suitable, and said baffle plate is provided with a plurality of vertical spacing holes; The bottom of said limit position part is flush-mounted in the said interior angle screw head groove suitablely, and the top of said limit position part is plugged in the said spacing hole.
Preferably, said limit position part and said baffle plate weld in said baffle plate end face contacting point.
Preferably, said ring gear also is connected through the dowel fixes that vertically is provided with said internal spline, and the end face of said pin also is lower than said internal spline end face.
Preferably, be provided with pad between said baffle plate and the said outer corner bolt, said outer corner bolt is fixedly connected with said baffle plate, said internal spline through said pad.
Preferably, said pad is the diplopore locked spacer, is equipped with said outer corner bolt in the through hole at each pad two ends.
Preferably, bending on the lateral of the two end part of each said pad corner bolt outside said.
Preferably, said interior angle screw is a socket head screw, and said outer corner bolt is the outer-hexagonal bolt.
The utility model provides a kind of power input assembly of wind-driven generator wheel-box, and ring gear is connected through vertical interior angle screw with internal spline, and the end face of interior angle screw is lower than the end face of internal spline; Baffle plate is connected through vertical outer corner bolt with internal spline.
Adopt this structural type; Promptly connect ring gear and internal spline with the interior angle screw; Connect internal spline and input shaft with the exterior angle screw, indirectly the three is fixed together, prevent that the three from producing axial displacement and radial displacement; Play safe and reliable locking effect, guarantee the transmission of power of gear-box power input assembly; Compare with a stay bolt the direct-connected mode of three, tensile stress and shearing stress that interior angle screw and exterior angle screws, bolts are born are less, have improved the functional reliability of power input assembly; Because the end face of interior angle screw is lower than the end face of internal spline, guaranteeing baffle plate can be fitted is installed in the end face of internal spline.
This shows; Adopt the power input assembly of said structure to adopt indirect ways of connecting that ring gear, internal spline and input shaft three are fixedly connected; Safety reliability is high; Have anti-loosing effect preferably, realized comprising the transmission of power of wind-driven generator wheel-box of the ring gear of the big facewidth, improved functional reliability greatly.
In another kind of embodiment, above-mentioned power input assembly can also comprise limit position part, and this limit position part bottom shape and interior angle screw head groove shapes are suitable, and baffle plate is provided with a plurality of vertical spacing holes; The bottom of limit position part be flush-mounted in suitablely with interior angle screw head groove in be connected, the top of limit position part is plugged in the spacing hole, and this limit position part and baffle plate can weld in baffle plate end face contacting point.
Adopt this structural type; Limit position part through vertically being plugged in the baffle plate spacing hole further connects interior angle screw and baffle plate; Make the fixed-site of baffle plate and interior angle screw, anti-baffle plate since radial displacement from draw-in groove, deviate from, again owing to adopt the mode of welding limit position part to be fixed in the mounting hole of baffle plate; It can't be deviate from from the mounting hole of baffle plate owing to vertical displacement, further strengthen the safety reliability of power input assembly.Adopt the power input assembly of this structure, when needs dismounting ring gear and internal spline, after only need hex head bolt all being pulled down; Input shaft is communicated with baffle plate to be extracted together; Dismantle socket head screw then and get final product, visible this welded structure not only can guarantee the intensity that is fixedly connected of limit position part and baffle plate, also has the easier characteristics of dismounting; And in the process of dismounting, can not damage internal spline, have safe and reliable technique effect.
The utility model also provides a kind of wind-driven generator wheel-box, comprises external gear, also comprises aforesaid power input assembly, the ring gear of said power input assembly and the engagement of said external gear.
Because above-mentioned power input assembly has above-mentioned technique effect, therefore comprise that the wind-driven generator wheel-box of this power input assembly also should have the corresponding techniques effect, repeats no more at this.
Description of drawings
Fig. 1 is the structural representation of ring gear assembly in the power input assembly of wind-driven generator wheel-box in the existing technology;
Fig. 2 is the left view of Fig. 1;
Fig. 3 is the erection drawing of existing technology medium power input assembly;
Fig. 4 surpasses the structural representation of the ring gear assembly of 500mm for the facewidth;
Fig. 5 is the structural representation of a kind of embodiment of the power input assembly of wind-driven generator wheel-box that the utility model provides;
Fig. 6 is the partial enlarged drawing of compound anti-loose structure among Fig. 5;
Fig. 7 is the structural representation of limit position part among Fig. 5;
Fig. 8 is the assemble sequence figure of the power input assembly among Fig. 5;
Fig. 9 is the structural representation after assembling is accomplished among Fig. 8.
Wherein, component names among Fig. 1 to Fig. 3 and the corresponding relation between the reference character are: ring gear 1 '; Internal spline 2 '; Tapped hole 21 '; Screw 22 '; Input shaft 3 '; Baffle plate 4 ';
Component names and the corresponding relation between the reference character among Fig. 4 to Fig. 9 are: ring gear 1; Internal spline 2; Input shaft 3; Baffle plate 4; Interior angle screw 51; Outer corner bolt 52; Limit position part 53; Pin 54; Pad 55.
Embodiment
The core of the utility model is to provide a kind of facewidth that comprises to surpass the power input assembly of wind-driven generator wheel-box of the ring gear assembly of 500mm; Its ring gear, internal spline and input shaft can be safe and reliable be connected; Have anti-loosing effect preferably, guarantee the transmission of power of wind-driven generator wheel-box.Another core of the utility model is that a kind of wind-driven generator wheel-box that comprises above-mentioned power input assembly is provided.
In order to make those skilled in the art understand the technological scheme of the utility model better, the utility model is done further to specify below in conjunction with accompanying drawing and specific embodiment.
Please refer to Fig. 5 and Fig. 6, Fig. 5 is the structural representation of a kind of embodiment of the power input assembly of wind-driven generator wheel-box that the utility model provides; Fig. 6 is the partial enlarged drawing of compound anti-loose structure among Fig. 5.
In a kind of embodiment, like Fig. 5 and shown in Figure 6, the power input assembly of a kind of wind-driven generator wheel-box that the utility model provides; Comprise input shaft 3, ring gear 1 and internal spline 2; Input shaft 3 is connected with the motor of gear-box, and for gear-box provides motive force, ring gear 1 constitutes the ring gear assembly with internal spline 2; Internal spline 2 fits in the end face of ring gear 1; The external splines and the internal spline 2 of input shaft 3 bottoms are connected, and input shaft 3 periphery walls are provided with draw-in groove, and internal spline 2 end faces are fitted with the baffle plate 4 that is plugged in the draw-in groove; Ring gear 1 is connected through vertical interior angle screw 51 with internal spline 2, and the end face of interior angle screw 51 is lower than the end face of internal spline 2; Baffle plate 4 is connected through vertical outer corner bolt 52 with internal spline 2.
Adopt this structural type; Promptly connect ring gear 1 and internal spline 2 with interior angle screw 51; Connect internal spline 2 and input shaft 3 with the exterior angle screw, indirectly the three is fixed together, prevent that the three from producing axial displacement and radial displacement; Play safe and reliable locking effect, guarantee the transmission of power of gear-box power input assembly; Compare with a stay bolt the direct-connected mode of three, interior angle screw 51 is less with tensile stress and shearing stress that outer corner bolt 52 bears, has improved the functional reliability of power input assembly; Because the end face of interior angle screw 51 is lower than the end face of internal spline 2, assurance baffle plate 4 can be fitted and is installed in the end face of internal spline 2.
This shows; The power input assembly of said structure adopts indirect ways of connecting that ring gear 1, internal spline 2 and input shaft 3 threes are fixedly connected; Safety reliability is high; Have anti-loosing effect preferably, realized comprising the transmission of power of wind-driven generator wheel-box of the ring gear 1 of the big facewidth, improved functional reliability greatly.
Need to prove; The noun of locality in the above-mentioned embodiment " radially " refers to the substantially horizontal of accompanying drawing 5; The noun of locality " axially " refers to the vertical direction in the accompanying drawing 5; The appearance that should be appreciated that these nouns of locality is that benchmark is set up with the accompanying drawing, and their appearance should not influence the protection domain of the utility model.
Please refer to Fig. 7, Fig. 7 is the structural representation of limit position part among Fig. 5; In conjunction with Fig. 7, the specific constructive form of the power input assembly of above-mentioned wind-driven generator wheel-box can also be set further.
In another kind of embodiment, above-mentioned power input assembly can also comprise limit position part 53, and these limit position part 53 bottom shapes and interior angle screw 51 top groove shapes are suitable, and baffle plate 4 is provided with a plurality of vertical spacing holes; The bottom of limit position part 53 is flush-mounted in the interior angle screw 51 top grooves suitablely, and the top of limit position part 53 is plugged in the spacing hole.
Adopt this structural type; Limit position part 53 through vertically being plugged in baffle plate 4 spacing holes further connects interior angle screw 51 and baffle plate 4; Make the fixed-site of baffle plate 4 and interior angle screw 51; Anti-baffle plate 4 further plays locking effect because radial displacement is deviate from from draw-in groove, more strengthened the safety reliability of power input assembly.
Particularly, above-mentioned limit position part 53 can weld in baffle plate 4 end face contacting points with baffle plate 4.Adopt the mode of welding that limit position part 53 is fixed in the mounting hole of baffle plate 4, it can't be deviate from from the mounting hole of baffle plate 4 owing to vertical displacement, further strengthen the safety reliability of power input assembly.Adopt the power input assembly of this structure, when needs dismounting ring gear 1 and internal spline 2, after only need hex head bolt all being pulled down; Input shaft 3 is communicated with baffle plate 4 to be extracted together; Dismantle socket head screw then and get final product, visible this welded structure not only can guarantee the intensity that is fixedly connected of limit position part 53 and baffle plate 4, also has the easier characteristics of dismounting; And in the process of dismounting, can not damage internal spline, have safe and reliable technique effect.
Other specific constructive form of the power input assembly of above-mentioned wind-driven generator wheel-box can also further be set.
In another kind of embodiment, above-mentioned ring gear 1 can also be fixedly connected through the pin 54 that vertically is provided with internal spline 2, and the end face of pin 54 also is lower than internal spline 2 end faces.Adopt this structural type; Can further reinforce the connection between ring gear 1 and the internal spline 2; Make it have better anti-loosing effect, pin 54 shearing stresses that bear between ring gear 1 and the internal spline 2 in the working procedure can further improve the working stability of power input assembly.
In another embodiment, be provided with pad 55 between above-mentioned baffle plate 4 and the outer corner bolt 52, outer corner bolt 52 is fixedly connected with baffle plate 4, internal spline 2 through pad 55.Pad 55 can reduce the wearing and tearing of outer corner bolt 52 and baffle plate 4; And avoid baffle plate 4 being caused damage because outer corner bolt 52 screws in tension; The pad 55 that after pad 55 serious wear, only need more renew gets final product, and further strengthens the connective stability of power input assembly.
Above-mentioned pad 55 can also be specially the diplopore locked spacer, is equipped with outer corner bolt 52 in the through hole at each pad 55 two ends.Because being located at input shaft 3 circumferential baffle plates 4 is spliced for several curved baffles; The fixed connection mode that adopts each pad 55 that two outer corner bolts 52 are installed; Can be with diplopore locked spacer 55 across in the jointing positions both sides, promptly the outer corner bolt 52 of two on the pad 55 is located at the jointing positions both sides, and pad 55 is outside anti-baffle plate 4 and corner bolt 52 inordinate wears like this; Can also play the effect that connects two curved baffles, the installation of further having reinforced baffle plate 4.
More specifically in the scheme, like Fig. 5 and shown in Figure 6, the two end part of above-mentioned each pad 55 bend on the lateral of corner bolt 52 outside.Adopt such structure, the pad 55 of bending can play outer corner bolt 52 radial displacements of restriction, prevents that further outer corner bolt 52 from becoming flexible in generation radially, thereby plays better anti-loosing effect.
Above-mentioned interior angle screw 51 can be socket head screw; Outer corner bolt 52 can be the outer-hexagonal bolt; Correspondingly; The bottom shape of above-mentioned limit position part 53 also can be hexagon, adopts the interior angle screw 51 and outer corner bolt 52 of this common form, makes the power input assembly of wind-driven generator wheel-box have characteristics simple in structure, convenient processing and manufacture.Certainly, above-mentioned interior angle screw 51, outer corner bolt 52 are not limited in socket head screw, outer-hexagonal bolt, can also be other multiple structural type, for example in anistree screw, outer anistree bolt etc.
The utility model also provides a kind of wind-driven generator wheel-box, comprises external gear, also comprises aforesaid power input assembly, the ring gear 1 of power input assembly and external gear engagement.
Because above-mentioned power input assembly has above-mentioned technique effect, therefore comprise that the wind-driven generator wheel-box of this power input assembly also should have the corresponding techniques effect, repeats no more at this.
More than a kind of wind-driven generator wheel-box and power input assembly thereof that the utility model provided have been carried out detailed introduction.Used concrete example among this paper the principle and the mode of execution of the utility model are set forth, above embodiment's explanation just is used to help to understand the method and the core concept thereof of the utility model.Should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (9)
1. the power input assembly of a wind-driven generator wheel-box; Comprise input shaft (3), ring gear (1) and fit in the internal spline (2) of said ring gear (1) end face; The external splines and the said internal spline (2) of said input shaft (3) bottom are connected; Said input shaft (3) periphery wall is provided with draw-in groove, and said internal spline (2) end face is fitted with the baffle plate (4) that is plugged in the said draw-in groove; It is characterized in that said ring gear (1) is connected through vertical interior angle screw (51) with said internal spline (2), the end face of said interior angle screw (51) is lower than the end face of said internal spline (2); Said baffle plate (4) is connected through vertical outer corner bolt (52) with said internal spline (2).
2. the power input assembly of wind-driven generator wheel-box according to claim 1; It is characterized in that; Also comprise limit position part (53), said limit position part (53) bottom shape and said interior angle screw (51) top groove shapes are suitable, and said baffle plate (4) is provided with a plurality of vertical spacing holes; The bottom of said limit position part (53) is flush-mounted in the groove of said interior angle screw (51) top suitablely, and the top of said limit position part (53) is plugged in the said spacing hole.
3. the power input assembly of wind-driven generator wheel-box according to claim 2 is characterized in that, said limit position part (53) welds in said baffle plate (4) end face contacting point with said baffle plate (4).
4. the power input assembly of wind-driven generator wheel-box according to claim 1; It is characterized in that; Said ring gear (1) also is fixedly connected through the pin (54) that vertically is provided with said internal spline (2), and the end face of said pin (54) also is lower than said internal spline (2) end face.
5. according to the power input assembly of each described wind-driven generator wheel-box of claim 1-4; It is characterized in that; Be provided with pad (55) between said baffle plate (4) and the said outer corner bolt (52), said outer corner bolt (52) is fixedly connected with said baffle plate (4), said internal spline (2) through said pad (55).
6. the power input assembly of wind-driven generator wheel-box according to claim 5 is characterized in that, said pad (55) is the diplopore locked spacer, is equipped with said outer corner bolt (52) in the through hole at each pad (55) two ends.
7. the power input assembly of wind-driven generator wheel-box according to claim 6 is characterized in that, bending on the lateral of the two end part of each said pad (55) corner bolt (52) outside said.
8. according to the power input assembly of each described wind-driven generator wheel-box of claim 1-4, it is characterized in that said interior angle screw (51) is a socket head screw, said outer corner bolt (52) is the outer-hexagonal bolt.
9. a wind-driven generator wheel-box comprises external gear; It is characterized in that, also comprise each described power input assembly, ring gear of said power input assembly (1) and said external gear engagement like claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203350047U CN202194789U (en) | 2011-09-07 | 2011-09-07 | Gear box of wind turbine and power input assembly of gear box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203350047U CN202194789U (en) | 2011-09-07 | 2011-09-07 | Gear box of wind turbine and power input assembly of gear box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202194789U true CN202194789U (en) | 2012-04-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203350047U Expired - Fee Related CN202194789U (en) | 2011-09-07 | 2011-09-07 | Gear box of wind turbine and power input assembly of gear box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202194789U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912592A (en) * | 2013-01-07 | 2014-07-09 | 诺迈士科技有限公司 | Connection mechanism of power transmission system |
| CN105042047A (en) * | 2015-08-13 | 2015-11-11 | 三一重型能源装备有限公司 | Limiting device and reducer |
-
2011
- 2011-09-07 CN CN2011203350047U patent/CN202194789U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912592A (en) * | 2013-01-07 | 2014-07-09 | 诺迈士科技有限公司 | Connection mechanism of power transmission system |
| CN105042047A (en) * | 2015-08-13 | 2015-11-11 | 三一重型能源装备有限公司 | Limiting device and reducer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120418 Termination date: 20170907 |