Planetary gear transmission unit
View Patent ↗A planetary gear transmission unit ( 10 ) includes a ring gear ( 17 ), a sun gear ( 18 ) and a planet carrier ( 19 ) driving a plurality of planet shafts ( 12 ) onto which planet gears ( 11 ) are rotatably mounted by way of planet bearings ( 13 ). The planet shafts are flexpin shafts ( 12 ) and each flexpin shaft ( 12 ) includes a pair of planet gears ( 11 ), each planet gear ( 11 ) of the pair being of the single helical type having a helix angle opposite to that of the other planet gear ( 11 ) of the pair. A gearbox ( 20 ) including a planetary gear transmission unit ( 10 ) according to embodiments of the invention and a wind turbine including such a gearbox ( 20 ) are also described.
1. A planetary gear transmission unit ( 10 ) comprising:
a ring gear ( 17 ), a sun gear ( 18 ) and a planet carrier ( 19 ) driving a plurality of planet shafts ( 12 ),
the planet shafts being flexpin shafts ( 12 ),
each flexpin shaft ( 12 ) comprising a pair of adjacent, spaced apart planet gears ( 11 ), each planet gear ( 11 ) free of contact with the other planet gear ( 11 ),
each planet gear ( 11 ) of the pair being of the single helical type and of a helix angle opposite to that of the other planet gear ( 11 ) of the pair,
wherein the planet gears ( 11 ) of the pair are located directly next to each other on the flexpin shaft ( 12 ).
2. The planetary gear unit transmission ( 10 ) according to claim 1 , wherein the planet gears ( 11 ) are rotatably mounted by means of planet bearings ( 13 ) and the planet bearings ( 13 ) are double-row tapered roller bearings.
3. The planetary gear transmission unit ( 10 ) according to claim 2 , wherein an outermost bearing ring of each double-row tapered roller bearing ( 13 ) is integrated in the planet gear ( 11 ) concerned.
4. The planetary gear transmission unit ( 10 ) according to claim 3 , wherein the rows of tapered roller bearings of each double-row tapered roller bearing ( 13 ) are arranged in an 0-configuration.
5. The planetary gear transmission unit ( 10 ) according to claim 2 , wherein the rows of tapered roller bearings of each double-row tapered roller bearing ( 13 ) are arranged in an 0-configuration.
6. The planetary gear transmission unit ( 10 ) according to claim 2 , wherein the planet bearings ( 13 ) are double-row cylindrical roller bearings.
7. The planetary gear transmission unit ( 10 ) according to claim 6 , wherein an outermost bearing ring of each double-row cylindrical roller bearing ( 13 ) is integrated in the planet gear ( 11 ) concerned.
8. The planetary gear transmission unit ( 10 ) according to claim 1 , wherein the ring gear ( 17 ) is of a unitary type.
9. The planetary gear transmission unit ( 10 ) according to claim 1 , wherein the sun gear ( 18 ) is of a unitary type.
10. The planetary gear transmission unit ( 10 ) according to claim 1 , wherein the pair of adjacent, spaced apart planet gears ( 11 ) are immediately adjacent each other free of any intermediate element therebetween.
11. A gearbox ( 20 ) comprising:
at least one planetary gear transmission unit ( 10 ),
the at least one planetary gear transmission unit ( 10 ) comprising a ring gear ( 17 ), a sun gear ( 18 ) and a planet carrier ( 19 ) driving a plurality of planet shafts ( 12 ),
the planet shafts being flexpin shafts ( 12 ),
each flexpin shaft ( 12 ) comprising a pair of adjacent, spaced apart planet gears ( 11 ), each planet gear ( 11 ) free of contact with the other planet gear ( 11 ),
each planet gear ( 11 ) of the pair being of the single helical type and of a helix angle opposite to that of the other planet gear ( 11 ) of the pair,
wherein the planet gears ( 11 ) of the pair are located directly next to each other on the flexpin shaft ( 12 ).
12. A wind turbine comprising the gearbox ( 20 ) according to claim 11 .
13. The gearbox according to claim 11 , wherein the planet gears ( 11 ) are rotatably mounted by means of planet bearings ( 13 ).
14. The gearbox according to claim 11 , wherein the pair of adjacent, spaced apart planet gears ( 11 ) are immediately adjacent each other free of any intermediate element therebetween.
15. A gearbox ( 20 ) comprising:
at least one planetary gear transmission unit ( 10 );
the at least one planetary gear transmission unit ( 10 ) comprising a ring gear ( 17 ), a sun gear ( 18 ) and a planet carrier ( 19 ) driving a plurality of planet shafts ( 12 ), the planet shafts being flexpin shafts ( 12 );
a first double-row tapered roller bearing ( 13 ) located adjacent a second double-row tapered roller bearing ( 13 ) on each planet shaft ( 12 ), the first and second double-row tapered roller bearings ( 13 ) being spaced apart and free of contact with each other;
a first planet gear ( 11 ) rotatably mounted on the first planet bearing ( 13 ) adjacent a second planet gear ( 11 ) rotatably mounted on the second planet bearing ( 13 ),
the first and second planet gears ( 11 ) being spaced apart and free of contact with each other,
each planet gear ( 11 ) of the first and second planet gears ( 11 ) being of the single helical type and of a helix angle opposite to that of the other planet gear ( 11 ).
16. The gearbox according to claim 15 , wherein the first and second planet gears ( 11 ) are immediately adjacent each other free of any intermediate element therebetween.