DE102016208827A1 - Planetary gear for a planetary gear, planetary gear and a method for producing a planet carrier - Google Patents

Abstract

Embodiments relate to a planet carrier (1) for a planetary gear, which is designed to support at least one gear (12) rotatably mounted about a rotation axis. The planet carrier (1) comprises a carrier component (2) and a pin (3) which is arranged coaxially with the axis of rotation. The pin (3) comprises at least one pin portion (4) which is formed monolithically with the carrier component (2).

Description

Embodiments relate to a planet carrier for a planetary gear, the planetary gear with the planet carrier and a method for producing the planet carrier.

In many planetary gear disc-shaped planet carrier are used to support the planetary gears, so that they are arranged radially outside of a sun gear. Most conventional planetary gearboxes are constructed with beams that use separate pins as bearing races of the planetary gears. These pins often connect a first disk-shaped component with a second disk-shaped component, between which the planetary gears are arranged in the axial direction. The two discs are then spaced apart by the pins. This may require that a variety of parts are to be mounted. Under certain circumstances, the use of the pin can also lead to a relatively high weight of the conventional planet carrier. This is undesirable.

There is therefore a need to improve a planet carrier for a planetary gear. This demand is taken into account by the planet carrier, the planetary gear and the method according to the independent claims.

Embodiments relate to a planet carrier for a planetary gear. The planet carrier is designed to support at least one gear rotatably about a rotation axis. For this purpose, the planet carrier comprises a carrier component and a pin. The pin is arranged coaxially with the axis of rotation of the gear. The pin comprises at least one pin portion which is formed monolithically with the support member. In some embodiments, this results in that the pin is at least partially manufactured or connected monolithically with a support member, a simplification of the assembly. This may be possible, for example, because no separate components or pins are to be mounted. This assembly steps can be omitted. Under certain circumstances, a weight of the planet carrier can be reduced, because at least partially the material of the planet carrier is used for the pin. In other words, a weight of the support member comprising the tenon or the tenon portion may be reduced relative to a support member connected to a separate tenon.

The gear can be, for example, a planetary gear. An axis of rotation about which the gear is rotatably mounted, for example, in the radial direction spaced from a central axis of the planet carrier and the transmission can be arranged. Under certain circumstances, a plurality of gears may be arranged on the planet carrier. For example, the planetary carrier may be configured to rotatably support at least two, three or four gears. For example, rotation axes about which the gears rotate may be circumferentially spaced from each other. In some embodiments, the axes of rotation may all be arranged on the same diameter.

The carrier component may be, for example, a disk-shaped component. It can also be an annular disk-shaped component which has a coaxially arranged to an outer periphery of the support member opening. The pin may, spaced from the central axis of the support member, rise from the plane of the support member. In other words, the journal or the journal section can have a greater extent in the axial direction than the carrier component in an area outside the journal. For example, the pin portion may extend only in one direction, starting from the carrier component. The pin portion may at least partially have a hollow cylindrical shape, for example with a lateral surface having a circular cross-section and a bore having a circular cross-section. The pin may have a smaller extent in the radial direction than the carrier component.

A pin portion, which is formed monolithically with the support member may be formed from the material of the support member, for example by deep drawing, casting, spraying or the like. The support member and the pin portion, which are formed monolithically, should here from a journal portion, which is connected for example via welding, gluing, screwing, riveting, pressing, clamping or the like to the support member different. The support member and thus also the pin or the journal portion may, for example, comprise a metallic material, for example a sheet metal, steel sheet or the like. An axial extent of the support member may be, for example, before the journal portion is made or even in areas that are outside of the journal portion small compared to an extension in the radial direction, for example at most 10%, 8%, 5%, 2% or 1% of a maximum radial extent of the carrier component.

In some embodiments, the planet carrier may include a second carrier member. This can for example be arranged to the first support member, that the gear is arranged in the axial direction between the two support members. The second carrier component can comprise a second monolithic pin portion. In an assembled state, the first carrier component and the second carrier component can be connected to one another via the two journal sections. In some embodiments, such additional components for connecting the two carrier components can be omitted. As a result, for example, a weight of the Planetenträges and possibly also a number of assembly steps can be reduced. Under certain circumstances, the two journal sections can be arranged coaxially with one another.

Additionally or alternatively, the first and / or the second pin portion in the axial direction have an extent which corresponds to between 10% and 80%, for example between 40% and 60% or at least 50% of a total journal length of the pin. The total journal length may be, for example, a distance that the two carrier components have in the axial direction relative to each other. In some embodiments, the fact that the pin portions have a similar length, a uniform loading of the two support members can be achieved.

Additionally or alternatively, the first pin portion and the second pin portion may be connected to each other, for example, positively and / or non-positively. In some embodiments, such a stable connection can be achieved. In some embodiments, the two pin sections can also be connected to one another in a material-locking manner.

Additionally or alternatively, the first pin portion may at least partially overlap the second pin portion in the axial direction. For example, for this purpose, the first pin portion may be arranged radially within the second pin portion. In some embodiments, the two journal sections may overlap in the axial direction, at most by 10%, 20%, 30% and / or at least 5% or 10% of a total journal length. For example, two spigot portions may overlap in the axial direction when one spigot portion is disposed radially inwardly and coaxially with the other spigot portion. The two pin sections may have identical diameters outside of an overlapping area. In the overlap region, the journal portion located radially inward may have an outer diameter that is configured to be received in an inner diameter of the other journal portion.

In the region of the overlap, the two pin sections can be crimped together, for example. For example, the positive or non-positive connection can also result over a flanging of a throat at the end of the journal section. In other words, one of the pin portions, for example, disposed radially inside the other pin portion, may have a U-shaped portion at its end. This U-shaped end can then be enclosed radially outside of the other pin portion, so that the two pin portions are fixed to each other in the axial direction.

Additionally or alternatively, a rivet or another connection component can be used radially within the journal sections, so that the two journal sections are connected to one another. For example, the rivet may be arranged coaxially with the two pin sections. Additionally or alternatively, the rivet in the axial direction may have a smaller extent than the total journal length, for example at most 80%, 60%, 50% or 40% of the total journal length. In some embodiments, even if the rivet is used, a weight saving can still be achieved over a separate pin connecting the two carrier disks together. In some circumstances, even if the rivet or the other connecting member is used, the two pin portions may be overlapped with each other in the axial direction as described. In other embodiments, the pin portions, which are connected to each other via the rivet or the other connecting member, in the axial direction abut each other. Under certain circumstances, this arrangement can also be selected if no rivet is used.

Additionally or alternatively, the pin may have a tread. The tread may be used to arrange a plurality of rolling elements, via which the gear is rotatably mounted relative to the pin. In some embodiments, an additional inner ring or a separate raceway element can then be omitted. The running surface may be formed, for example, to guide balls, rollers, cylindrical rollers, needle rollers or the like. The storage may be, for example, a tapered roller bearing, a cylindrical roller bearing, a deep groove ball bearing, an angular contact ball bearing or other rolling bearing in a single-row or a two-row arrangement.

Additionally or alternatively, the first pin portion and / or the second pin portion at least partially have a hardened surface. In some embodiments, it can thereby be achieved that the journal or the journal sections can serve as a running surface. For example, the curing can be done only in the areas in which the treads are arranged. In some circumstances, the entire planet carrier or the entire pin to be hardened.

In some embodiments, concentric with the pins may be an inner ring having a tread for a plurality of rolling elements over which the gear is rotatably supported relative to the pin. In some embodiments, it may thus be possible that machining of the planetary carrier may be dispensed with, for example hardening or the like. The inner ring can be arranged for example via a press fit on the pin.

Embodiments also relate to a planetary gear with the planet carrier according to one of the described embodiments.

Embodiments also relate to a method for producing a planet carrier for planetary gear, which is designed to support at least one gear rotatably about an axis of rotation. For this purpose, at least one journal section is deep-drawn on a first carrier component. In some embodiments can be made possible by that conventional separate pin, against which the gears are rotatably mounted, can be omitted. Under certain circumstances, all bearing components and the gears can then be arranged on the deep-drawn pin section. Then possibly a second support member can be arranged. Subsequently, the two support members can be connected via the two pin sections. It is also conceivable that the pin sections are only made when all components of the planet carrier, so bearing components and gears are already positioned.

The embodiments disclosed in the foregoing description, the appended claims and the appended figures, as well as their individual features, may be important and implemented both individually and in any combination for the realization of an embodiment in its various forms.

Thus, the figures show schematically the following views.

1 shows a schematic representation of a perspective view of a partially cut planet carrier according to an embodiment;

1a shows a schematic representation of a perspective view of the planet carrier of 1 with arranged on the planet carrier gears;

2 shows a schematic representation of a perspective view of a partially cut planet carrier according to another embodiment;

2a shows a schematic representation of a perspective view of the planet carrier of 2 with arranged on the planet carrier gears;

3 shows a schematic representation of a perspective view of a partially cut planet carrier according to another embodiment; and

4 shows a schematic representation of a perspective view of a partially cut planet carrier according to another embodiment.

In the following description of the accompanying drawings, like reference characters designate like or similar components. Further, summary reference numbers are used for components and objects that occur multiple times in one embodiment or in one representation, but are described together in terms of one or more features. Components or objects which are described by the same or by the same reference numerals may be the same, but possibly also different, in terms of individual, several or all features, for example their dimensions, unless otherwise explicitly or implicitly stated in the description.

The 1 and 1a show schematic representations of a perspective view of a planet carrier 1 according to an embodiment. The planet carrier 1 can be used in a planetary gear, not shown, and is designed to at least one in 1a illustrated gear 12 rotatably about an axis of rotation R store. This includes the planet carrier 1 a carrier component 2 and a pin 3 that is coaxial with the axis of rotation 3 is arranged. The pin 3 comprises at least one pin portion 4 , which is monolithic with the carrier component 2 is trained.

In the embodiment of the 1 includes the planet carrier 1 also a second carrier component 5 , Both carrier components 2 and 5 are annular disks, which are arranged in the axial direction M next to each other and about a common center axis M. The second carrier component 5 includes a second pin portion 6 , The carrier component 2 , also as the first carrier component 2 can be referred to, is about its pin section 4 with the support component 5 and the monolithic at this molded pin portion 6 connected. In other words, the two pin sections form 4 and 6 the pin 3 , The pin sections 4 and 6 each protrude only from a side of the carrier component, on which they are molded, facing the other carrier component. A side of the carrier component facing away from the other carrier component is pin-free. The pin sections 4 and 6 For example, by reshaping the carrier component 2 or 5 to which they are arranged to be made. For example, the carrier component 2 to the point where the pin section 4 is to be deep-drawn. This results in the radial direction overlapping with the pin portion 4 an opening 10 in the carrier component 2 , Under certain circumstances, an axial extension of the carrier components 2 and 5 be thin compared to an axial distance between the components. For example, an axial extension of the carrier component 2 or 5 at least 2%, 5%, 7% or 10% and / or at most 10%, 20%, or 30% of an axial distance between the support members 2 and 5 be.

Overall, the planet carrier has four pins 3 . 3 -a, 3 -Federation 3 -C on. These all serve to support a planetary gear. The cones 3 . 3 -a, 3 -Federation 3 -C are each spaced apart in the circumferential direction, but arranged in the radial direction on the same diameter. In other embodiments, not shown, a different number of pins may be provided. The axis of rotation R of the pins 3 . 3 -a, 3 -Federation 3 C is arranged radially spaced from the central axis M. Each of the cones 3 . 3 -a, 3 -Federation 3 C is completely radially overlapping the annular disc-shaped region of the carrier components 2 and 5 arranged. A diameter of the pin section 4 or 6 is smaller than a radial extent of the carrier component 2 or 5 , The carrier components 2 and 5 only touch over the pin sections 4 and 6 , In areas where no pins are arranged, the support components 2 and 5 spaced apart. This in 1a illustrated gear 12 is in the axial direction between the carrier component 2 and the carrier component 5 rotatable around the pin 3 arranged.

In the embodiment of the 1 the pin section overlaps 4 in the axial direction at least partially with the pin portion 6 , Here is the pin section 4 in the region in which the two pin portions overlap in the axial direction, radially inwardly of the pin portion 6 arranged.

The two pin sections 4 and 6 are positively and / or non-positively connected. In the embodiment of the 1 has a support member 2 facing end 8th of the journal section 6 a section 9 on, which projects radially inward. this section 9 is from a the carrier component 5 facing the end 7 of the journal section 4 encompassed. The end 7 is around the section 8th of the journal section 6 bent around or has a U-shape. By that, the end 7 The U-shape may be like a rivet to connect to the section 9 serve. The connection can be made, for example, by crimping the ends of the pin sections 4 and 6 be achieved.

A viewed from the axis of rotation R radially outward surface 11 of the pin 3 or the corresponding sub-surfaces of the pin sections 4 and 6 can serve directly as a running surface for rolling elements over which the planet gears are mounted. In the embodiment of the 1 For example, the rolling elements may be needle rollers or cylindrical rollers. This can be at least the area 11 be hardened to provide sufficient stability for the tread. In other embodiments, the entire planet carrier 1 be hardened.

The 1a shows the planet carrier 1 with at the cones 3 . 3 -A and 3 -C arranged gears 12 , As with the cut pin 3 can be seen as rolling elements in the axial direction adjacent two rows of needle rollers 13 -A and 13 -B arranged. These are each by a Ka 14 guided. Also between the gear 12 and the needle rollers 13 -Federation 13 -A is no separate outer ring arranged. Instead, viewed from the axis of rotation R radially inwardly facing surface of the gear is used 12 as a running surface for the needle rollers 13 -A and 13 b.

In some other, not shown embodiments, the cages can also be omitted or other rolling elements are used.

The 2 shows a schematic representation of a perspective view of a planet carrier 21 according to a further embodiment. The embodiment of 2 is essentially similar to the planet carrier 1 of the 1 and 1a , Identical components or similar components are therefore designated by the same reference numerals.

The planet carrier 21 is different from the planet carrier 1 by a radially outwardly directed surface 22 from the axis of rotation R of the pin 3 out of view. Also the area 22 has runways here 23 on. However, the careers are 23 arranged and formed to serve as raceways for angular contact ball bearings. For this purpose, the raceways are arranged at a transition at which the pin sections 6 and 4 in the axial direction of the carrier components 2 and 5 protrude.

The 2a shows the planet carrier 21 in an enlarged view, wherein on the pin 3 and 3 -A one gear each 12 is arranged. These are in the radial direction between the pin 3 and the gear 12 two adjacent rows in the axial direction 24 -A and 24 -B arranged by rolling elements. The rolling elements are designed as balls. Also, the radially inward side of the gear 12 has a tread 25 -A for the row of rolling elements 24 -A and a tread 25 -B for the row of rolling elements 24 -B on.

The 3 shows a schematic representation of a perspective view of a partially cut planet carrier 31 according to a further embodiment. The planet carrier 31 is substantially similar to the previously described planetary carriers 1 and 21 , Identical or similar components are therefore designated by the same reference numerals.

The planet carrier 31 is different from the planet carrier 1 or 21 in that not a radially outwardly directed surface 32 of the pin 3 viewed from the axis of rotation R as a running surface for the rows of rolling elements 24 -Federation 24 -B serves. Instead, in the radial direction between the pin 3 and the gear 12 two inserts arranged as inner rings 33 and 34 are formed. The inner rings 33 and 34 each have a tread 23 for the rolling elements. At the inner rings 34 and 33 these are two separate inner rings arranged in the axial direction adjacent to one another. In other embodiments, under certain circumstances, a continuous inner ring may be arranged. In some embodiments, by arranging the inner rings, it is possible to allow the planet carrier 31 not or its surface 32 must be processed so that it can serve as a tread. Furthermore, for example, a hardening of the entire planet carrier can be omitted. Under certain circumstances, the inner rings 33 and 34 a harder material than the carrier components 2 and 5 ,

It is not an outer ring between the gear 12 and the rolling elements of the rolling element rows 24 -A and 24 -B arranged. In other, not shown embodiments, here also an outer ring, the running surfaces for the rolling bearing rows 24 -A and 24 -B.

The 4 shows a schematic representation of a perspective view of a partially cut planet carrier 41 according to a further embodiment. The planet carrier 41 is essentially similar to the planet carrier 31 , but differs by a rivet 42 that is radially inward of the pin 3 and of course also with the other, but not closer recognizable pin is arranged.

The rivet 42 serves to connect the pin sections 4 and 6 , The rivet 42 has a smaller extent in the axial direction than a distance between the carrier components 2 and 5 , Thus, in some embodiments, nevertheless, a weight saving can be achieved. Although in the embodiment of the 4 the planet carrier 41 illustrated with inner rings, the rivet can 42 or another connection component also for better connection in the embodiments of 1 and 2 be used.

In other words, some embodiments relate to a planet carrier from a metal sheet with a deep-drawn pin. In some embodiments, a separate pin omitted. The function can be taken over deep-drawn pin or pin sections, which are deep drawn from the support components. In some embodiments, the rolling elements can run directly on the deep-drawn pin or on these pins used inner rings, which are supported on the pin. About a flange of Durchhalsungen at the end of the pin and / or rivets can be connected to the deep-drawn pin and center. In some embodiments, a combination of flanging and riveting may be conceivable, for example, when higher joining forces appear necessary.

In some embodiments, this may reduce a number of parts to be assembled, which may eventually lead to a reduction in production costs. Planet carriers according to embodiments can be used in all possible applications, for example in all possible transmissions, in the automotive sector, in other vehicles or even in industrial applications.

In some other embodiments, features disclosed as a device feature in other embodiments may also be implemented as method features. Further, features that are implemented as method features in some embodiments may also be implemented as device features in other embodiments.

LIST OF REFERENCE NUMBERS

1

planet carrier

2

first carrier component

3

spigot

4

first pin section

5

second carrier component

6

second pin section

7

The End

8th

The End

9

section

10

opening

11

radially outwardly directed surface

12

gear

13

needle roller

14

Cage

21

planet carrier

22

radially outwardly directed surface

23

tread

24

rolling elements

25

tread

31

planet carrier

32

area

33

inner ring

34

inner ring

41

planet carrier

42

rivet

M

central axis

R

axis of rotation

Claims (10)

Planet carrier ( 1 ) for a planetary gear, wherein the planet carrier ( 1 ) is formed to at least one gear ( 12 ) rotatably support about an axis of rotation, comprising: a support member ( 2 ) and a pin ( 3 ), which is arranged coaxially to the axis of rotation, wherein the pin ( 3 ) at least one journal section ( 4 ), which is monolithic with the carrier component ( 2 ) is trained. A planetary carrier according to claim 1, further comprising a second carrier component ( 5 ), which has a second monolithic journal section ( 6 ), wherein the journal portion ( 4 ) of the first carrier component ( 2 ) with the second pin portion ( 6 ) of the second carrier component ( 5 ) connected is. A planetary carrier according to claim 2, wherein the pin portion ( 4 ) of the first carrier component ( 2 ) in the axial direction has an extension between 40% and 70% of a total journal length. Planet carrier according to one of the preceding claims 2 or 3, wherein the first pin portion ( 4 ) and the second pin section ( 6 ) are positively connected to each other and / or non-positively connected. Planet carrier according to one of the preceding claims 2 to 4, wherein the first pin portion ( 4 ) and the second pin section ( 6 ) overlap at least partially in the axial direction with each other, so that the second pin portion ( 6 ) radially within the first pin portion ( 4 ) is arranged. Planet carrier according to one of the preceding claims, wherein the pin ( 3 ) for a plurality of rolling elements ( 13 -A) has a running surface over which the gear ( 12 ) rotatably relative to the pin ( 3 ) is stored. A planetary carrier according to claim 6, wherein at least the first pin portion ( 4 ) and the second pin section ( 6 ) have a hardened surface. Planet carrier according to one of the preceding claims, further comprising an insert ( 33 ), which has a tread ( 23 B) for a plurality of rolling elements ( 24 -B) over which the gear ( 12 ) rotatably relative to the pin ( 3 ), the insert ( 33 ) concentric with the pin ( 3 ) is arranged. Planet carrier according to one of the preceding claims, wherein the first pin portion ( 4 ) and the second pin section ( 6 ) via a coaxial to the pin sections ( 4 . 6 ) arranged rivet ( 42 ) are connected. Method for producing a planet carrier ( 1 ) for a planetary gear, wherein the palm carrier is adapted to at least one gear ( 12 ) rotatably support about an axis of rotation, with the following features: deep drawing a journal portion ( 4 ) from a first carrier component ( 2 ).

Images