1. A gearbox operating under high and varying loads at low pitch line velocities, comprising:
a plurality of gears operating under high and varying loads at low pitch line velocities;
wherein at least the tooth contact areas of at least two of the plurality of gears are substantially finished to a surface roughness Ra less than 0.25 \u03bcm using an isotropic superfinishing process;
wherein substantially full elasto-hydrodynamic lubrication occurs between the superfinished tooth contact areas.
2. The gearbox of claim 1, wherein at least the tooth contact areas of at least two of the plurality of gears are substantially superfinished to a surface roughness Ra less than 0.15 \u03bcm using an isotropic superfinishing process.
3. The gearbox of claim 1, wherein at least the tooth contact areas of the plurality of gears are substantially superfinished to a surface roughness Ra less than 0.25 \u03bcm using an isotropic superfinishing process.
4. The gearbox of claim 1, wherein at least the tooth contact areas of the plurality of gears are substantially superfinished to a surface roughness Ra less than 0.15 \u03bcm using an isotropic superfinishing process.
5. The gearbox of claim 1, wherein substantially full elasto-hydrodynamic lubrication occurs between the superfinished tooth contact areas during a substantial portion of normal operation.
6. The gearbox of claim 1, wherein the superfinished tooth contact areas are substantially superfinished in a vibratory vessel containing a plurality of media.
7. The gearbox of claim 1, wherein the superfinished tooth contact areas are substantially superfinished using a chemically accelerated isotropic superfinishing process.
8. The gearbox of claim 1, wherein at least one of the superfinished gears are heat treated by a method selected from the group consisting of gas carburization, gas nitriding, and through-hardening.
9. A planetary gear stage operating under high and varying loads at low pitch line velocities, comprising:
a plurality of gears operating under high and varying loads at low pitch line velocities comprising a hollow wheel gear, a plurality of planet gears, and a sun gear;
wherein at least the tooth contact areas of at least two of the plurality of gears are substantially finished to a surface roughness Ra less than 0.25 \u03bcm using an isotropic superfinishing process;
wherein substantially full elasto-hydrodynamic lubrication occurs between the superfinished tooth contact areas.
10. The planetary gear stage of claim 9, wherein at least the tooth contact areas of at least two of the plurality of gears are substantially superfinished to a surface roughness Ra less than 0.15 \u03bcm using an isotropic superfinishing process.
11. The planetary gear stage of claim 9, wherein at least the tooth contact areas of the hollow wheel gear and at least one of the planet gears are substantially superfinished to a surface roughness Ra less than 0.25 \u03bcm an using an isotropic superfinishing process.
12. The planetary gear stage of claim 9, wherein at least the tooth contact areas of the hollow wheel gear and at least one of the planet gears are substantially superfinished to a surface roughness Ra less than 0.15 \u03bcm using an isotropic superfinishing process.
13. The planetary gear stage of claim 9, wherein substantially full elasto-hydrodynamic lubrication occurs between the superfinished tooth contact areas during substantial portion of a normal operation.
14. The planetary gear stage of claim 9, wherein the superfinished tooth contact areas are substantially superfinished in a vibratory vessel containing a plurality of media.
15. The planetary gear stage of claim 9, wherein the superfinished tooth contact areas are substantially superfinished using a chemically accelerated isotropic superfinishing process.
16. The planetary gear stage of claim 9, wherein at least one of the superfinished gears are heat treated by a method selected from the group consisting of gas carburization, gas nitriding, and through-hardening.
17. A wind turbine comprising:
a planetary gear stage operating under high and varying loads at low pitch line velocities, the planetary gearbox comprising a plurality of gears comprising a hollow wheel gear, a plurality of planet gears, and a sun gear;
wherein at least the tooth contact areas of at least two of the plurality of gears are substantially finished to a surface roughness Ra less than 0.25 \u03bcm using an isotropic superfinishing process;
wherein substantially full elasto-hydrodynamic lubrication occurs between the superfinished tooth contact areas.
18. The wind turbine of claim 17, wherein at least the tooth contact areas of at least two of the plurality of gears are substantially superfinished to a surface roughness Ra less than 0.15 \u03bcm using an isotropic superfinishing process.
19. The wind turbine of claim 17, wherein at least the tooth contact areas of the hollow wheel gear and at least one of the planet gears are substantially superfinished to a surface roughness Ra less than 0.25 \u03bcm using an isotropic superfinishing process.
20. The wind turbine of claim 17, wherein at least the tooth contact areas of the hollow wheel gear and at least one of the planet gears are substantially superfinished to a surface roughness Ra less than 0.15 \u03bcm using an isotropic superfinishing process.
21. The wind turbine of claim 17, wherein substantially full elasto-hydrodynamic lubrication occurs between the superfinished tooth contact areas during a substantial portion of normal operation.
22. The wind turbine of claim 17, wherein the superfinished tooth contact areas are substantially superfinished in a vibratory vessel containing a plurality of media.
23. The wind turbine of claim 17, wherein the superfinished tooth contact areas are substantially superfinished using a chemically accelerated isotropic superfinishing process.
24. The wind turbine of claim 17, wherein at least one of the superfinished gears are heat treated by a method selected from the group consisting of gas carburization, gas nitriding, and through-hardening.
25. A planetary gear stage operating under high and varying loads at low pitch line velocities, comprising:
a plurality of gears operating under high and varying loads at low pitch line velocities comprising a hollow wheel gear, a plurality of planet gears, and a sun gear; and
means for reducing lubricant debris buildup from the planetary gear stage.
26. A planetary gear stage operating under high and varying loads at low pitch line velocities, comprising:
a plurality of gears operating under high and varying loads at low pitch line velocities comprising a hollow wheel gear, a plurality of planet gears, and a sun gear; and
means for eliminating the run-in process for the planetary gear stage.
27. A planetary gear stage operating under high and varying loads at low pitch line velocities, comprising:
a plurality of gears operating under high and varying loads at low pitch line velocities comprising a hollow wheel gear, a plurality of planet gears, and a sun gear; and
means for reducing micropitting of the planetary gear stage.
28. A planetary gear stage operating under high and varying loads at low pitch line velocities, comprising:
a plurality of gears operating under high and varying loads at low pitch line velocities comprising a hollow wheel gear, a plurality of planet gears, and a sun gear; and
means for reducing vibration and noise from the planetary gear stage.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. Protection method for data exchanged between a multimedia processing device and a security module managed by a management centre, the multimedia processing device receiving the encrypted multimedia data and being responsible for decrypting and converting this data so that it may be used, said device comprising a personal key, the method comprising:
obtaining by the multimedia processing device an identifier pertaining to an entity representing a group of multimedia processing devices,
calculating a security key formed by a one-way function based on the personal key of the processing multimedia device and the entity identifier,
transmitting this security key to the security module connected to said entity,
forming a security key between the multimedia processing device and the security module, by means of the transmission by the security module of the entity identifier to the multimedia processing device,
calculating by the multimedia processing device of the security key a one-way function based on the personal key of said multimedia processing device and the entity identifier, and
using this security key to secure the data exchanged between the multimedia processing device and the security module.
2. Method according to claim 1, wherein the entity identifier is obtained by the transmission of said identifier by the security module.
3. Method according to claim 1, wherein the entity identifier is obtained by the extraction of said identifier from the data stream received by the multimedia processing device.
4. Method according to claim 1, wherein the multimedia processing device comprises a deciphering and decompression module in which the personal key is initialized.
5. Method according to claim 4, further comprising:
verifying the identity of the security key in the security module and in the deciphering and decompression module by the encryption with said key of a message containing at least one part predefined by the security module, and verifying this predefined part after decryption by the deciphering and decompression module.
6. Method according to claim 1, wherein the one-way function is at least one of a hash function and hash MAC function.
7. Method according to claim 1, wherein the one-way function is an encryption function of the entity identifier by the personal key.
8. Method according to the claim 4, wherein the deciphering and decompression module comprises a list of entity identifiers, this deciphering and decompression module verifying the conformity of the identifier received from the security module in comparison with this list.
9. Method according to claim 8, wherein the multimedia processing device receives multimedia data comprising the data allowing this list of identifiers to be formed.
10. Method according to claim 8, wherein the deciphering and decompression module includes a key to decrypt or verify the signature of the data of the list transmitted.
11. Method according to one of the claim 8, wherein the list of identifiers is called a positive list, that is to say comprising the identifiers authorised for the creation of the personal key.
12. Method according to one of the claim 8, wherein the list of identifiers is called a negative list, comprising the identifiers prohibited for the creation of the personal key.
13. Deciphering and decompression module for mounting in a multimedia processing device, comprising:
a central unit,
a deciphering module,
a decompression module, and
at least one personal key, said deciphering and decompression module comprising generation means for generating a security key, calculated from a one-way function based on the personal key and an identifier received by said deciphering and decompression module.
14. Deciphering and decompression module according to claim 13, further comprising:
a memory containing a list of identifiers, and
verification means for verifying the conformity of the identifier received from the security module in comparison with the list.
15. Deciphering and decompression module according to claim 13, further comprising a common key and means for at least one of decrypting and verifying the list of identifiers received.
16. Deciphering and decompression module according to claim 14, further comprising a common key and means for at least one of decrypting and verifying the list of identifiers received.