Abstract
Is suggested as an output from a planetary gear with a sun wheel (1) as a unit, with at least a first planetary gear set having at least a second set of planetary gears, one ring gear (2) as an element and supporting a vehicle (3), wherein the planetary gears of said first and second groups in the radial direction substantially around the axis of rotation between the sun gear (1) and the outer circumference of the gear (2) are arranged.
Description
The present invention relates to a planetary gear according to the loosely defined in the preamble of claim 1 Art
From the publication DE 197 20 255 A1 is called a planetary gear , comprising a central axis connected with a solar powered wheel , ring gear , a group of first planet gears staggered and a second planetary gear group intensified. The central sun wheel is in an axial plane of a series of large gears staggered staggered the second planet gears in the commitment. are provided in a different plane , the small stepped wheels of the stepped planet gears simultaneously with a second pair of adjacent large stepped gears of the first stepped planetary gears in engagement. Finally , in a third plane , all the little gears intensified staggered the first planetary gear with the ring gear . This translates into only partially divided , as in the last stage no torque split . Furthermore, considerable space is required in the axial direction due to the three planes , and also provided for engagement with the stepped planetary particular dimensions also ring gear .
The present invention is based on the problem of proposing a planetary gear of the above type , which is as compact as possible , in spite of a high gear ratio .
This problem is solved by the features of claim 1. Other advantageous embodiments will be apparent from the claims and the drawings.
Is a planetary gear with a planetary gear as a unit, with at least a first stage planetary gear set having at least a second group of planetary gear stages , ring gear as a support element , and a support planetary proposed as an output , wherein the planetary gears of the first and second groups are arranged in the radial direction substantially around the axis of rotation between the sun gear and the outer periphery of the ring gear .
Thus, a planetary gear full power split is performed with a high gear ratio , which is very compact , even though the multiple stages . In contrast to the known planetary gears are axially arranged one behind the other planet wheels of the two groups extend relative to the radial direction is substantially within the external dimensions of the ring gear , so that only a minimum amount of radial space required for the planetary gear according to the invention is required .
In a preferred embodiment of the invention can be provided that the axes of rotation of the planetary gears of the first and second group are assigned substantially as a circle with a predetermined radius that extends to the sun gear disposed centrally within the ring gear . Due to the energy distribution of power flow is a particularly effective multiple and tooth width of the gears is reduced accordingly. Due to the inventive arrangement of the axes of rotation of the central points of the planetary gears are substantially on the circle, in which the direct connection line between the centers of the planet wheels regulate practically form a hexagon .
Preferably, the planet wheels of the first group can each be formed as a double -pinion with a common axis of rotation and the planetary gears of the second group in each case as a single pinion. Preferably, the double planet in the first group may each have one large and one small wheel step wheel step for common rotation axis . For example , you can provide in the first group and three double planets second group three individual planet . The number of planetary gears can also be used also varies depending on the application.
Preferably, the large stepped gear can engage the small stepped gear and are associated respectively with two single- pinion of the second group , respectively , in engagement with the driven crown wheel . This results in only two axial levels of intervention , so that not only the radial space requirement , but also the axial size is minimized when the planet gear according to the invention.
According to a possible embodiment of the invention can be provided that the bearing of the double pinion is disposed between each of the small gear and the large stepped wheel of the stepped common axis of rotation . This is particularly useful to accommodate the tilting moment occurring due to the meshing forces . In this type of storage, however, requires multiple parts or folding double planets . However, it is also possible to provide another bearing so that is double pinion may be integrally formed .
The single pinion of the second group forms a second axial plane , and each is engaged with the fixed ring gear and at the same time two smaller steps double planet wheels of the third group in the first intervention . Since the planetary gear carrier connected to the output shaft supports both the planetary gears of the first stage and the second planetary gear stage , the power output of the superposition of the individual planet is performed , in which the bearing of the double pinion accommodate tilting moment through the teeth coupling forces , since power is transmitted through the planetary double bit wear.
With the invention is achieved with an epicyclic gear planet multiple branching ratio and high performance, which also implements a particularly compact design , so considering the given boundary conditions for use in a direct drive vehicle meets the most easy. Use as a single wheel is particularly advantageous in the planetary gear mechanism on the drive side of the invention is , for example, with an electric motor and on the output side directly connected to the wheel hub . The planetary gear very compact design which can accommodate the head of the wheel easily , at least partially or completely. However, there are other applications are conceivable .
The present invention is further illustrated with reference to the drawings. In the drawings:
1 is a schematic plan view of a possible embodiment of a planetary gear according to the invention;
February 1 cutaway side view of the planetary gear according to the invention;
3 is a view three-dimensional schematic of the planetary gear according to the invention, and
4 is a view exploded planetary gear according to the invention.
The planetary gear comprises a sun gear 1 as a unit. Further provided are a first group of stages, and a second planetary gear set planet wheel stage . As the support member is a ring gear 2 and the output is a planet three provided .
The invention is characterized in that planetary gears are arranged in the first and second group in the radial direction substantially around the axis of rotation between the sun gear 1 and the outer circumference of the sprocket 2 .
According to 1 It is clear that the rotation axes of the planetary gears of the first and second groups is substantially along a common circle 4 are arranged with the predetermined radius of the centrally disposed sun gear 1 runs. This results in a particularly space-saving in which direct communication lines between the center points of the planetary gears almost 6 regular hexagon .
2 shows particularly the sun gear 1 January shaft 5 is connected . Planet 3 is connected to an output shaft is not shown. The planetary gears of the first set are each formed as a double pinion a common axis of rotation , wherein the planet wheels of the second group in each case as a single pinion 7 , 7A, 7B are formed. The second group comprises , in the illustrated embodiment , three single planet 7, 7A , 7B .
Each double each planet has a great team of stage 8 , 8A , 8B and smaller gear step 9 , 9A , 9B on a common axis of rotation . The large wheels step 8 , 8A, 8B, respectively , mesh with the sun gear 1 in which the stepped small gears 9, 9A , 9B each containing two single planet 7, 7A , 7B of the second group are in engagement . Furthermore, the individual planets are 7, 7A , 7B, each of the second group with two stationary ring gear engaged. In the first group are three duals copies planet with three major steps 8, 8A , 8B, and three-wheeled small step 9, 9A , 9B previews.
1 and 3 show that the planet wheels of the first and second groups in the radial extension of the ring gear within 2 are arranged so that a particularly space-saving is implemented . Furthermore, in particular 3 shows that two layers are formed in axial coupling of the planetary gear according to the invention , so that the axial space is reduced to a minimum. The individual components of the planetary gear are proposed in exploded view illustrated in 4 .
In the planetary gear proposed results in a very compact Advantageously, despite the high gear ratio . Results of multiple divided into a favorable flow of energy and the tooth width of the planetary gear wheels used can be reduced. The predetermined conditions for a drive wheel , wherein the sun gear according to the invention is arranged at least with a group of the head of the planet wheel are met .
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