The present invention relates to a planetary carrier arrangement of a planetary gear, in particular a planetary gear of a side door drive, as well as a method for the manufacture of such a planetary carrier arrangement.
Side door drives are known from prior art in different embodiments, serving the automated operation of side doors, in particular a sliding door of a motor vehicle. Side door drives of this kind typically comprise a planetary gear, which provides a gear reduction for a side door drive. In this instance, the planetary gear comprises at least one planetary carrier that is arranged on a drive shaft, wherein said planetary carrier retains multiple, pivot-mounted planetary wheels that are retained at a distance from the drive shaft.
Side door drives with a planetary carrier arrangement are known from prior art, which are configured from a two-part steel planetary carrier in cage form, wherein the planetary carrier is pressed onto a drive shaft or is attached to it by means of two plastic side plates. Planetary carriers of this kind are mass-produced and have the disadvantage of being time-consuming to assemble. Planetary carrier arrangements of this kind are typically assembled from a number of different components that are then bolted or pressed together. Another disadvantage of said prior art is that there is a limit to the amount of material savings that can be achieved to reduce the weight of such a side door drive, which makes the side door drives unnecessarily heavy.
Although the above-described starting position is relevant in particular for side door drives, said starting position applies also to other applications of planetary gear arrangements. Examples for planetary gear arrangements of this kind are known from DE 10 2005 023 542 A1, DE 10 2015 119 803 A1 and WO 2014/095966 A1.
It is therefore the object of the present invention to provide a planetary gear arrangement of a planetary gear, in particular a planetary gear of a side door drive, as well as a method for the manufacture of the planetary gear arrangement, which simplifies the assembly of the planetary gear arrangement, permits a maximum in weight reduction and reduces the complexity of components to a minimum. Said object is achieved with the features described in claims 1, 3, 4, 7, 9, 10, 14, 15, 16, 17, 18 and 20. Advantageous embodiments are subject of the dependent claims.
One embodiment of the invention relates to a planetary carrier arrangement of a planetary gear, in particular a planetary gear of a side door drive, comprising
The use of steel for the planetary wheel axle has the advantage that the planetary wheel axle can be provided with a reduced diameter and/or can be provided with a reduced amount of material but is still able to bear high loads.
According to a further embodiment, the planetary wheel axle is pressed into the planetary carrier on the first side and is caulked with the planetary carrier on the second side, or reverse.
This embodiment requires no thermal joining process. Caulking is an easily controllable and economic production step so that the fastening of the planetary wheel axle on the planetary carrier can be carried out in a comparatively simple manner.
One exemplary embodiment of the invention relates to a method for the production of a planetary carrier arrangement according to the above-described further embodiment, comprising the following steps:
The above-described technical effects can be achieved with this method. In particular it is not necessary to use a thermal joining method.
One embodiment of the invention relates to a planetary carrier arrangement of a planetary gear, in particular of a planetary gear of a side door drive, comprising
In contrast to the further above-described embodiment the planetary carrier arrangement of this design is made solely from plastic. The material characteristics, for example the heat expansion characteristic, are very uniform so that there are no measures required to compensate for the different material characteristics.
In a further-developed embodiment, the planetary wheel axle may be pressed on the first side into the planetary carrier and ultrasonically welded to the planetary carrier from the first side.
The assembly of the planetary carrier arrangement in this embodiment may be carried out either from the first side only or from the second side only. It is therefore not necessary to turn the planetary carrier, in particular during assembly, which not only simplifies and shortens the assembly process but also reduces the cost.
In a further-developed embodiment the planetary wheel axle may be provided with at least one locking means with which the planetary wheel axle is retained on the planetary carrier.
The utilization of locking means has the advantage of being able to attach the planetary wheel axle to the planetary carrier very quickly, reliably and simply. As soon as the planetary wheel axle is located in its final position, it is fastened to the planetary carrier. No further fastening measures are required.
According to a further exemplary embodiment, said method may comprise the following steps:
This exemplary embodiment of the method has the particular advantage that the planetary carrier does not have to be turned during assembly. Further clamping may therefore be omitted. This simplifies and shortens the assembly process. Although this exemplary embodiment aims to press the planetary wheel axle into the planetary carrier from the first side and also to weld it from the first side, said method may of course also be implemented by carrying out said steps exclusively from the second side.
According to a further-developed exemplary embodiment the method may comprise the following steps:
As already mentioned, interlocking is a particularly simple and quick step for joining the planetary wheel axle to the planetary carrier. It is therefore possible to assemble the planetary carrier arrangement very quickly and cost-effectively.
One implementation of the invention concerns a planetary carrier arrangement of a planetary gear, in particular a planetary gear of a side door drive, comprising
The deformations may also be produced through caulking of the planetary carrier without the necessity for thermal treatment of the planetary carrier. Furthermore, a planetary wheel axle is not necessary. The deformations act as bearing pins. This reduces the number of components, and it is not necessary to carry out an energy-intensive, thermal deformation.
One implementation of the invention concerns a method for the manufacture of a planetary carrier arrangement according to the above-described implementation, comprising the following steps:
The stated advantages of the planetary carrier arrangement manufactured with this method apply equally to the method according to this implementation. Particular emphasis is placed upon the reduction of components as well as on the possibility of being able to omit an energy-intensive, thermal deformation.
In a further implementation of the method, the planetary carrier shows, on the first side, a first material buildup and on the second side, a second material buildup, wherein the step of forming the first deformation is carried out through deforming the planetary carrier in the vicinity of the first material buildup, and the step of forming the second deformation is carried out through deforming the planetary carrier in the vicinity of the second material buildup.
By using the material buildups it is possible to determine, and in particular increase, the wall thickness and thus the rigidity of the first and of the second deformation.
A further developed implementation of the present invention is characterized in that the planetary carrier is provided with pockets on the first side and/or on the second side into which the planetary wheels with corresponding protrusions may be placed. On assembly, it is necessary to arrange the planetary wheels concentrically to the planetary wheel axles to enable the planetary wheel axles to pass through the planetary wheels. The utilization of the pockets permits the preliminary fixing of the planetary wheels prior to the planetary wheel axles being passed through the same. This makes assembly easier.
According to a further implementation of the present invention the planetary carrier comprises a bund against which the planetary wheel axle or the planetary wheel runs up. The provision of a bund has the effect that the planetary wheel is axially fixed on the planetary wheel axle. A wear point forms on the bund since the planetary wheel rotates relative to the stationary planetary carrier. The bund may be designed such that friction and wear are minimized and the planetary wheel and the planetary carrier are not damaged due to wear.
One embodiment of the invention relates to a planetary carrier arrangement of a planetary gear, in particular a planetary gear of a side door drive, comprising
In contrast to the above-described variations of the planetary carrier arrangement, the planetary carrier in this embodiment is made in two parts. Whilst, when assembling the planetary carrier arrangement with a one-part planetary carrier, the planetary wheels have to be inserted from the side into the recess and placed concentrically to the planetary wheel axles, with the two-part embodiment of the planetary carrier it is possible to push the planetary wheels onto the planetary wheel axles prior to attaching the cover to the cage. Since the concentric alignment prior to the insertion of the planetary wheel axle through the planetary wheel is redundant, the assembly is simpler when compared to that of a one-piece planetary carrier. Because the planetary wheel axle is made from steel, it is possible to manufacture the planetary wheel axle with a high degree of strength and a comparatively small diameter and/or with a reduced amount of material.
One embodiment of the invention relates to a method for the manufacture of a planetary carrier arrangement according to the above-described embodiment, comprising the following steps:
As already mentioned, pushing the planetary wheels onto the planetary wheel axles is significantly simpler compared to the concentric alignment of the planetary wheels prior to the insertion of the planetary wheel axle, which makes the assembly of the two-part planetary carrier simpler.
A further development of the invention relates to a planetary carrier arrangement of a planetary gear, in particular a planetary gear of a side door drive, comprising
In this further development the planetary carrier arrangement is made exclusively from plastic so that measures to compensate for different material characteristics are not necessary, which may, for example, be necessary when using steel as material for the planetary wheel axles. Moreover, in this further development provision is made that the planetary wheel axle is formed from the cage or from the cover. Thus, the planetary wheel axle does not constitute an additional component, which reduces the overall number of components.
According to a more advanced further development the method comprises the following steps:
With this further development of the method it is possible to manufacture the planetary carrier arrangement in a very simple manner. Due to the fact that the planetary wheel axle is formed by the cage, the step of attaching the planetary wheel axle to the cage becomes obsolete. The assembly is also made easier since there are no logistical measures required any longer for providing the planetary wheel axle. Although this further development aims to form the planetary wheel axle from the cage, the advantages apply equally if the planetary wheel axle is formed from the cover.
One embodiment of the invention relates to a planetary carrier arrangement of a planetary gear, in particular a planetary gear of a side door drive, comprising
In this embodiment one of the planetary wheel axle sections may be made in tubular form so that the other planetary axle section may be inserted into the tubular planetary wheel axel section. During the insertion, the cover is already positioned with respect to the cage so that the subsequent joining step can not [sic] be guided in a relatively simple manner.
A further embodiment is characterized in that the cage consists of a first plastic material and the cover consists of a second plastic material.
In this embodiment it is possible to choose the plastic material that comes into contact with the planetary wheel so that it has good gliding characteristics. The plastic material that does not come into contact with the planetary wheel may have particularly high rigidity, where said plastic material may be fiber reinforced, for example. This means that with this method it is possible to achieve high rigidity on the one hand and good gliding characteristics on the other hand.
A further embodiment of the invention relates to a method for the manufacture of a planetary carrier arrangement according to any one of the above-described designs, comprising the following steps:
As already described, when joining the two planetary wheel axle sections, the cover and the cage are positioned to each other so that the subsequent fastening steps can be carried out in a relatively simple manner.
According to a further developed embodiment, the cover, the cage and/or the planetary wheel axles are provided with locking means with which the cover is fastened to the planetary wheel axles or to the cage through interlocking.
As also mentioned earlier, interlocking is a particularly simple and quick joining step.
A further-developed embodiment is characterized in that the cover is fastened to the planetary wheel axles or to the cage by means of ultrasonic welding. Welding times are very short, which means that the ultrasonic welding can be carried out very economically. The joining members are only slightly heated up in the welding area, and the surrounding material is not damaged.
Exemplary embodiments of the invention are described below in greater detail with reference to the attached drawings. Shown are in:
Eight different exemplary embodiments of a planetary carrier arrangement 10 according to the invention will be described in greater detail with reference to the
The same, or functionally the same parts, are given the same reference numerals in the different exemplary embodiments.
The planetary carrier arrangement 101 shown in
As is apparent from
Four recesses 24 are formed or machined into the planetary carrier 12, each of which is accessible, circumferentially symmetrical, from an outer shell surface 30 and which extend between the first wall 26 and the second wall 28.
Moreover, the first side 20, or the first wall 26 respectively, and the second side 22 or second wall 28 are provided with four openings 32 that are evenly distributed over the circumference, wherein said openings 32 connect the respective first side 20 and the second side 22 with the recess 24. The openings 32 are arranged around the circumference, centered to the respective recess 24.
One of the planetary wheels 16 is inserted into each recess 24 respectively, wherein said planetary wheel 16 protrudes in part beyond the shell surface 30 of the flange 18, and is rotatably retained by means of a planetary wheel axle 34 in the recess 24 around a planetary wheel rotational axis APR. The planetary wheels 16 are adapted with respect to the planetary wheel rotational axis APR to the size of the recess 24. Each of the planetary wheels 16 is provided with a through bore 36 along the planetary wheel rotational axis APR (see
In the first exemplary embodiment of the planetary carrier arrangement 101, shown in
It is apparent from
The second exemplary embodiment of the planetary carrier arrangement 102, shown in
In the third exemplary embodiment of the planetary carrier arrangement 103, shown in
A fourth exemplary embodiment of the planetary carrier arrangement 104 is shown in
A fifth exemplary embodiment of the planetary carrier arrangement 105 according to the invention is shown in
A sixth exemplary embodiment of the planetary carrier arrangement 106 according to the invention is shown in
In the seventh exemplary embodiment of the planetary carrier arrangement 107 according to the invention, shown in
An eighth exemplary embodiment of the planetary carrier arrangement 108 according to the invention is shown in
The internal diameter of the tube-like second planetary wheel axle section 70 corresponds approximately to the outer diameter of the first planetary wheel axel section 68, so that both planetary wheel axle sections 68, 70 can be joined to each other. In the joined state the second planetary wheel axle section 70 encloses the first planetary wheel axel section 68, although the reverse case is also possible.
The cage 64 is made from a first plastic material and the cover 66 is made from a second plastic material, both of which are chosen so that they can be ultrasonically welded together, which creates the weld seam 48 shown in
List of Reference Numerals
10 Planetary carrier arrangement
10
1 to 108 Planetary carrier arrangement
12 One-piece planetary carrier
14 Drive shaft
16 Planetary wheel
18 Flange
20 First side
22 Second side
24 Recess
26 First wall
28 Second wall
30 Shell surface
32 Opening
34 Planetary wheel axle
36 Through bore
38 Pocket
40 Protrusion
42 Semicircular section
44 Bund
46 Thrust washer
48 Weld seam
50 Locking means
52 Projection
54 First deformation
56 Second deformation
58 First material buildup
60 Second material buildup
62 Two-part planetary carrier
64 Cage
66 Cover
68 First planetary wheel axle section
70 Second planetary wheel axle section
APT Rotational axis
APR Planetary wheel rotational axis
Number | Date | Country | Kind |
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102019109616.2 | Apr 2019 | DE | national |