Abstract:
A hub nut for a planetary transmission has a body configured to secure against unscrewing and to seal the planetary transmission.

Description:
This application claims priority under 35 U.S.C. §119 to patent application no. DE 10 2012 018 715.7, filed on Sep. 21, 2012 in Germany, the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND 
     The present disclosure relates to a hub nut for a planetary transmission and to a planetary transmission. 
     Planetary transmissions are known from DE 60 2005 005 448 T2. Here, a sun wheel on a sun wheel shaft and a planet spider with planet wheels are arranged within an annulus. 
     Planetary transmissions are used as travel transmissions for frequent and infrequent travelers, for example. In such planetary transmissions, however, there is generally a large number of different rotation seals with different geometrical dimensions on the annulus for securing and sealing. In this way, the annulus and, if appropriate, other parts of the planetary transmission can be adapted to the respective rotation seal to be used. 
     Moreover, an additional static sealing element, e.g. an O-ring or other flexible seals, has to be used on the annulus for a main bearing. For this purpose, an additional design element is generally required in the annulus, e.g. a groove in the annulus. As a result, a large number of complex processing steps is necessary. 
     Moreover, an additional securing element, e.g. a cylindrical pin, an adhesive etc., is generally required to secure the main bearing on the annulus. An additional design element, e.g. a hole, is required in the annulus for the cylindrical pin. When using an adhesive, dosing is problematic. As a result, problems also arise with cleanliness. Thus, the securing means gives rise to additional complex processing steps that cause problems. 
     Overall, a great variety of parts in the assembly process and a complex adjustment process in the assembly of the transmission are required with current planetary transmissions. In particular, time-consuming measurement and grinding of adjusting washers for adjusting the main bearings also has to be carried out. Moreover, it would be particularly desirable to ensure that the bearings could be assembled as part of the modular structure in the case of a broached annulus. By this means too, it is possible to avoid errors in assembly, such as not installing an O-ring, installing the wrong size of O-ring, incorrect installation of the O-ring in respect of its position or twisting, incorrect dosing of the adhesive, incorrect type of adhesive, application of adhesive omitted, or inadequate cleanliness of the parts because swarf, grease and other dirt are present. 
     It is therefore the object of the present disclosure to provide a hub nut for a planetary transmission and a planetary transmission by means of which it is possible to solve the abovementioned problems. In particular, the aim is to provide a hub nut for a planetary transmission and a planetary transmission in which different nominal sizes can be installed in a simple and more robust manner and with fewer processing steps than hitherto, thus resulting in a reduction in costs and a more stable assembly process. 
     SUMMARY 
     This object is achieved by a hub nut for a planetary transmission having the features of the disclosure and a planetary transmission having the features of the disclosure. 
     Advantageous further embodiments of the hub nut and of the planetary transmission are indicated in the dependent patent claims. 
     With the hub nut, a combination of the following functions is possible in a single component: axially securing the main bearing unit, receiving the rotation seal, and thread coating as a means of securing against unscrewing and sealing, offering sealing or separation of the media oil and air. In this way, adaptation of the various requirements resulting from the different nominal sizes and modules is possible without having to change the A-class components, such as the annulus etc. 
     In the case of the hub nut, the body is, in particular, configured in such a way that there is support and fixing in the axial direction for a main bearing unit in the annulus. Moreover, the body has a sealing function. As a result, a securing function as a means of securing against unscrewing for the axial fixing of the main bearing units and a sealing function for the transmission with respect to the outside are provided as a solution to the abovementioned problem which is economical, involves a reliable process, is functionally reliable and is relatively simple. 
     The following advantages, in particular, are thereby obtained. There is no longer a need for an additional static sealing element, e.g. an O-ring or other flexible seals. As a result, an additional design element in the annulus, e.g. a groove in the annulus, is also eliminated. Thus, fewer parts and processing steps are required. Moreover, there is also no need for an additional securing element, e.g. a cylindrical pin, adhesive etc. This too eliminates an additional design element in the annulus, e.g. a hole for the cylindrical pin in the annulus or the application of the adhesive with the associated problems. This too means that fewer parts and processing steps are required. 
     Overall, the hub nut and the planetary transmission provided therewith offer logistical advantages by reducing the number of design elements and providing a more stable assembly process through a reduction in the possibility of error. Reducing the design elements has effects on the complexity of the parts list. In summary, the resulting tooling costs are lower. Moreover, more robust assembly through the elimination of a pliable sealing element, such as the sealing ring or O-ring, and a more stable assembly process through preparation of the element outside the assembly process are possible. 
     Further possible implementations of the disclosure also include combinations of features or embodiments that are not explicitly cited but are described above or below in connection with the illustrative embodiments. At the same time, a person skilled in the art will also add individual aspects as improvements or supplementary features to the respective basic form of the disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure is described in greater detail below with reference to the attached drawings and by means of illustrative embodiments. In the drawings: 
         FIG. 1  shows a sectional view of a planetary transmission having a hub nut in accordance with a first illustrative embodiment; 
         FIG. 2  shows a detail view of the planetary transmission having the hub nut in accordance with the first illustrative embodiment; 
         FIG. 3  shows a sectional view of a planetary transmission having a hub nut in accordance with a second illustrative embodiment; 
         FIG. 4  shows a detail view of the planetary transmission having the hub nut in accordance with the second illustrative embodiment; 
         FIG. 5  shows a detail view of a planetary transmission having a hub nut in accordance with a third illustrative embodiment; 
         FIG. 6  shows a further detail view of the planetary transmission having a hub nut in accordance with the third illustrative embodiment; and 
         FIG. 7  shows a detail view of a planetary transmission having a hub nut in accordance with a fourth illustrative embodiment. 
     
    
    
     In the figures, elements which are identical or functionally identical are provided with the same reference signs, unless indicated otherwise. 
     DETAILED DESCRIPTION 
       FIG. 1  shows a planetary transmission  1  having an annulus  10 , a sun wheel  20 , a sun wheel shaft  21 , a planet wheel  30 , a planet bearing  31 , a planet carrier or planet spider  40 , a supporting axle  50 , a shaft nut  51 , a main bearing unit  60 , an intermediate element  61 , which is, for example, an intermediate ring, a cover  70 , a driver  80 , an anti-rotation safeguard  90  and a hub nut  100 . The sun wheel shaft  21  and/or the planet spider  40  with the planet spider journal  41  can be moved relative to the cover  70 . Moreover, the sun wheel  20  and the sun wheel shaft  21  can be moved relative to one another. 
     In  FIG. 1 , the hub nut  100  is mounted between the anti-rotation safeguard  90  and the annulus  10 . Here, the hub nut  100  is arranged in such a way that it secures the main bearing unit  60  in the axial direction. The main bearing unit  60  serves to support the annulus  10  on the supporting axle  50 . 
     As can be seen from  FIG. 2 , the hub nut  100  has a body  101 . For securing the main bearing unit  60 , the hub nut  100  has a contact region  102 , at which the main bearing unit  60  rests on the hub nut  100 . Moreover, the hub nut  100  has a coated region  103 , which is arranged on the annulus  10 . In addition, the hub nut  100  has a receiving region  104 , on which the anti-rotation safeguard  90  is received. 
     The coated region  103  serves as a means of securing against unscrewing and of sealing the planetary transmission  1 . 
     The hub nut  100  is substantially rectangular. Thus, the contact region  102  is arranged substantially transversely to the coated region  103 . The receiving region  104  is arranged substantially parallel to the coated region  103 . 
     By means of the hub nut  100 , an additional adjusting process during transmission assembly can be eliminated. No time-consuming measurement and grinding of adjusting washers for adjusting the main bearing unit  60  is required. Moreover, the suitability of the main bearing unit  60  for installation as part of the modular structure in the case of a broached annulus  10  is ensured. Only a unilateral assembly sequence is possible, and therefore an additional process of turning the annulus  10  during the assembly process is no longer necessary. 
     Moreover the hub nut  100  is an integral construction element of compact design. As a result, the interface between a support ring and the annulus  10  and the associated additional components in the prior art are eliminated. 
     By means of the hub nut  100 , the main bearing unit  60  is supported and fixed in the axial direction in the annulus  10 . Moreover, an additional degree of freedom for the insertion of various rotation seals with various geometrical dimensions is created without the need for a change in the A-class parts of the module, e.g. the annulus  10  etc. 
     In addition, it is possible to use rotation seals of the same dimensions across the range of transmission nominal sizes. 
     Owing to the design solution of a “broachable annulus” required by the modular principle, the direction of installation of the main bearing unit  60  is predetermined. The hub nut  100  ensures that the main bearing unit  60  can be installed under different boundary conditions, by virtue of the module. 
       FIG. 3  shows a planetary transmission  2  having a hub nut  110  in accordance with a second illustrative embodiment. In this illustrative embodiment, the hub nut  110  is of L-shaped configuration, wherein the hub nut  110  is once again arranged in such a way that it is arranged between the cavity  10  and the anti-rotation safeguard  90  and rests on the main bearing unit  60 . A sealing element  91  is arranged between the hub nut  110  and the main bearing unit  60 . 
     In other respects, the planetary transmission  2  in accordance with this illustrative embodiment is embodied in the same way as described in the case of the first illustrative embodiment. 
       FIG. 4  shows the arrangement of the hub nut  110  on the annulus  10  of the main bearing unit  60  and the anti-rotation safeguard  90  in more detail. Once again, the hub nut  110  has a body  111  and a contact region  112  to enable the hub nut  110  to rest on the main bearing unit  60 . The contact region  112  also serves to enable the hub nut  110  to rest on the sealing element  91 , which can be an O-ring, for example. Moreover, the hub nut  110  has a coated region  113 , in which the hub nut  110  rests on the annulus  10 . The coated region  113  has the same function as the coated region  103  in the first illustrative embodiment. In addition, the hub nut  110  has a receiving region  114  for receiving the anti-rotation safeguard  90 . 
     The hub nut  110  is substantially L-shaped. Here too, however, the contact region  112  is arranged substantially transversely to the coated region  113 . The receiving region  114  is arranged substantially parallel to the coated region  113 . 
     The planetary transmission  2  and the hub nut  110  in accordance with this illustrative embodiment achieve the same advantages as those mentioned above in relation to the first illustrative embodiment. 
       FIG. 5  shows a planetary transmission  3  having a hub nut  120  in accordance with a third illustrative embodiment. In this illustrative embodiment too, the hub nut  120  is arranged between the annulus  10  and the anti-rotation safeguard  90 . Moreover, the hub nut  120  rests on the main bearing unit  60 . 
       FIG. 6  shows the arrangement of the hub nut  120  in the planetary transmission  3  in greater detail. The hub nut  120  has a body  121 , a contact region  122 , a coated region  123  and a receiving region  124 . The contact region  122  is indicated only schematically in  FIG. 6  and has the same function as described in the case of the first illustrative embodiment. The coated region  123  is arranged between the annulus  10  and the hub nut  120 . The coated region  123  and the receiving region  124  have the same function as that described for the coated region  103  and the receiving region  104  in the case of the first illustrative embodiment. 
     In the case of the hub nut  120 , a receiving region  124  for receiving the anti-rotation safeguard  90  is of offset design. The anti-rotation safeguard  90  is also received by the supporting axle  50 . Here too, the contact region  122  is arranged substantially transversely to the coated region  123 . The receiving region  124  is arranged substantially parallel to the coated region  123 . 
     In other respects, the planetary transmission  3  in accordance with this illustrative embodiment is embodied in the same way as described in the case of the first illustrative embodiment. 
     The planetary transmission  3  and the hub nut  120  in accordance with this illustrative embodiment achieve the same advantages as those mentioned above in relation to the first illustrative embodiment. 
       FIG. 7  shows part of a planetary transmission  4  having a hub nut  130  in accordance with a fourth illustrative embodiment. 
     In this illustrative embodiment too, the hub nut  130  is once again arranged between the annulus  10  and the anti-rotation safeguard  90 . In this illustrative embodiment, there is once again an additional sealing element  91  between the hub nut  130  and the annulus  10 . The main bearing unit  60  rests on a contact region  132  of the hub nut  130 . 
     The hub nut  130  has a body  131 , the contact region  132 , a coated region  133  and a receiving region  134 . The receiving region  134  serves to receive the anti-rotation safeguard  90 . The coated region  133  and the contact region  132  have the same function as that described for the coated region  103  and the contact region  102  in the case of the first illustrative embodiment. Here too, the contact region  132  is arranged substantially transversely to the coated region  133 . The receiving region  134  is arranged substantially parallel to the coated region  133 . 
     The hub nut  130  in accordance with this illustrative embodiment is once again substantially L-shaped, wherein the receiving region  134  is offset here. 
     The planetary transmission  4  and the hub nut  130  in accordance with this illustrative embodiment achieve the same advantages as those mentioned above in relation to the first illustrative embodiment. 
     All the embodiments of the planetary transmission  1 ,  2 ,  3 ,  4  and of the hub nut  100 ,  110 ,  120 ,  130  which have been described above can be used individually or in all possible combinations. In particular, all the features and/or functions of the illustrative embodiments described above can be combined in any way. In addition, the following modifications, in particular, are conceivable. 
     The parts illustrated in the figures are shown schematically and may differ from the forms shown in the figures in the precise way in which they are embodied as long as their functions described above are ensured. 
     Using the hub nut  100 ,  110 ,  120 ,  130  in accordance with the illustrative embodiments described above, the use of high-productivity production processes is possible by virtue of effects such as bundling of production runs, in particular a broachable annulus. The use of the coated region  103 ,  113 ,  123 ,  133 , which can also be referred to as hub nut thread coating, can extend across modules and nominal sizes. 
     The receiving region  104 ,  114 ,  124 ,  134  of the hub nut  100 ,  110 ,  120 ,  130  can be of offset design, as illustrated by a recess in  FIG. 5  to  FIG. 7 . Here, the depth of the recess can be chosen to suit the requirements. 
     The hub nut  100 ,  110 ,  120 ,  130  in accordance with the illustrative embodiments described above can also be a threaded ring. The hub nut  100 ,  110 ,  120 ,  130  in accordance with the illustrative embodiments described above can be embodied as a thread coating in the coated region  103 ,  113 ,  123 ,  133 . 
     The hub nut  100 ,  110 ,  120 ,  130  in accordance with the illustrative embodiments described above is preferably manufactured from metal, e.g. alloyed or unalloyed steel etc. The coated region  103 ,  113 ,  123 ,  133  of the hub nut  100 ,  110 ,  120 ,  113  in accordance with the illustrative embodiments described above is preferably coated with an adhesive sealing compound. 
     The sealing element  91  is installed in such a way that no additional groove is required in the annulus  10 . For this purpose, the annulus  10  and the main bearing unit  60  are arranged in an appropriate manner relative to one another, thus creating the required installation space for the sealing element  91 . Depending on the embodiment, it is also possible for the sealing element  91  to be omitted. 
     The planetary transmission  1 ,  2 ,  3 ,  4  in accordance with the first to fourth illustrative embodiments can be a travel and pivoting transmission for frequent and infrequent travel applications. The planetary transmission  1 ,  2 ,  3 ,  4  in accordance with the first to fourth illustrative embodiments can also be a winch transmission. The planetary transmission  1 ,  2 ,  3 ,  4  in accordance with the first to fourth illustrative embodiments can be a stationary transmission. The planetary transmission  1 ,  2 ,  3 ,  4  in accordance with the first to fourth illustrative embodiments can furthermore be a pitch and azimuth transmission for wind power plants. Moreover, the planetary transmission  1 ,  2 ,  3 ,  4  in accordance with the first to fourth illustrative embodiments can be any derivative special form of transmission.