DE102017112331A1 - Planetary gear with multi-part planet carrier and positive connection for preventing rotational movement of three components - Google Patents

Abstract

The invention relates to a planetary gear (1) for a motor vehicle, comprising a multi-part planet carrier (2) in which a plurality of planetary gears (3) is rotatably storable, wherein the planet carrier (2) has a base body (4) on which at least one Plate (5) of the planet carrier (2) is fixed axially and rotationally fixed, wherein the base body (4) first positive locking elements (6) and the plate (5) has second positive locking elements (7), wherein the first positive locking elements (6) and the second interlocking elements (7) in Gegenformschlusselemente (8) of a torque transmission member (9) for preventing relative rotation of the base body (4), the plate (5) and the torque transmission member (9) engage against each other.

Description

The invention relates to a planetary gear, in particular for a two-stage planetary gear or a compact gear in an E-axis, for a motor vehicle, with a multi-part planet carrier, in which a plurality of planetary gears is rotatably storable, wherein the planet carrier has a base body on which at least a plate of the planet carrier is mounted axially and rotationally fixed.

To avoid a relatively complex and costly production of a one-piece cast-iron planet carrier by the use of insert cores, multipart planet carriers are often used.

However, multi-part planetary carrier of the prior art are usually composed of two or more sheet metal components and fastened together, for example via a rivet or welded joint. However, a welded joint does not lend itself, for example, when a casting is to be joined to a sheet metal part, when welding of the components is expected to cause thermal distortion, or when assembly and disassembly are to be facilitated. In the prior art, there are various solutions to connect two components without a welded joint.

For example, the DE 2031 654 A a torsionally rigid connection, in particular gear, with two cooperating transmission elements, each carrying a ring member having an axially extending cylindrical extension and which produces a torsionally stiff coupling with the ring member of the other transmission element, wherein the ring elements are made of sheet metal and in their cylindrical Extension axially extending tooth-like indentations, which are in the manner of a spline in mutual engagement.

In addition, the disclosed DE 39 22 827 A1 a housing part of thin-walled sheet metal for a clutch or the like. With a bottom, with a self-contained housing wall, with axially parallel ribs and stops for the axial fixation of a ring, snap ring or the like .., wherein the ribs at a distance from the stops on a cylindrical Ends wall piece and wherein the stops are arranged in the cylindrical wall piece.

Furthermore, the disclosure DE 10 2006 018 496 A1 a connection of sheet metal components of a transmission, wherein the connection has at least one positive connection between at least one first sheet metal component and at least one second sheet metal component and thereby the positive connection is formed by at least one protruding from the first sheet metal pin, wherein the pin in one at least partially with the outer Contour of the pin corresponding opening engages the second sheet metal component, wherein the pin engages behind the second sheet metal component at least at an undercut of the second sheet metal component and that the sheet metal components are inextricably linked to each other at the undercut.

Also reveals the DE 103 02 075 A1 an arrangement for the axial support of two rotating components by means of a snap ring having two spaced by a circumferential gap, movable in the region of a radial spring travel butt ends and is inserted into an annular groove of the supporting member, wherein the component to be supported at least one ramp in the radial Has spring travel of the butt ends of the snap ring.

However, the prior art has the disadvantage that these known connection techniques are either not suitable for connecting castings with sheet metal parts, or a compound of castings and sheet metal parts only very expensive, i. can be realized by additional design effort, only by multiple security elements or only with impairment of the functionality of the planet carrier.

It is therefore the object of the invention to avoid or at least reduce the disadvantages of the prior art. In particular, a multi-part planet carrier is to be developed, which can be particularly easily and inexpensively connected, if possible, with existing elements, with a torque transmitting to the planet carrier component in particular rotation. In particular, all separate components of the planet carrier are to be secured against relative rotation with respect to the torque transmitting component. It should also be possible to specify castings and sheet metal parts facing each other.

The object of the invention is achieved in a generic device according to the invention that the main body of the planet carrier first positive locking elements and the plate of the planet carrier has second positive locking elements, wherein the first positive locking elements and the second positive locking elements in Gegenformschlusselemente a torque transmitting component for preventing relative rotation of the components, ie of the main body, the plate and the torque transmitting member, against each other.

This has the advantage that, in particular, only one type of counter-form-locking elements is formed on the torque-transmitting component must, in which the first positive locking elements of the body and the second positive locking elements of the plate can engage. The production of the planetary carrier and the torque-transmitting component is thus considerably simplified, without the functionality, namely a torque transmission, is impaired.

Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

Further, it is advantageous if the first positive locking elements and the second positive locking elements are arranged in a plane, so that the counter-form-locking elements can be arranged in a plane, which advantageously facilitates the manufacture and assembly considerably.

Furthermore, it is advantageous if the plane is arranged perpendicular to the axis of the planet carrier, since so particularly advantageous torque can be transmitted from the torque transmitting member to the axis of rotation of the multipart planet carrier.

It is also expedient if the first positive-locking elements and the second positive-locking elements are similar, ie. h., Are formed with the same outer geometry, of the same material and / or with the same dimensions. Thus, it no longer has to be ensured that the first positive locking elements and the second positive locking elements engage in the corresponding counter-form-locking elements, since they are of exactly the same design, ie the corresponding counter-form-locking elements are also identical and thus not dependent on a specific rotational orientation of the engaging components must be respected. In addition, it is ensured that the torque-transmitting surfaces of the first positive locking elements and the second positive locking elements are the same size, so that the surface pressure is approximately equal to all surfaces.

It is also advantageous if in each case a first positive locking element and a second positive locking element cooperate with the same a counter-form-locking element. Thus, therefore, only one counter-form-locking element must be formed on the torque-transmitting component in order to fix two separate components rotationally and in a torque-transmitting manner.

Furthermore, it is expedient if the first positive locking elements and the second positive locking elements are arranged on the circumference of a circle about the axis of rotation of the planet carrier, since the torque can be transmitted uniformly to the axis of rotation.

Furthermore, it is preferred if the circle is coaxial / concentric with the axis of the planet carrier.

In addition, it is expedient if the first form-fitting elements and the second form-fitting elements are designed and arranged so that they are alternately / alternately, in the assembled state, for. B at regular or not regular intervals, are arranged on the circumference of the circle.

Furthermore, it is advantageous if in the assembled state of the planet carrier extending in the axial direction, ie perpendicular to the circumferential direction, side surfaces of the first interlocking elements and the second interlocking elements with axially extending side surfaces of the Gegenformschlusselemente for torque transmission are in conditioning. This can ensure that the torque to be transmitted is transmitted to the planet carrier without great losses.

It is also advantageous if in the mounted state extending in the radial direction, ie perpendicular to the axial direction front surfaces of the first positive locking elements and the second positive locking elements are perpendicular to the axial direction front surfaces of the Gegenformschlusselemente for axial positioning in Appendix. Thus, therefore, the axial position of the components is limited in an axial direction.

Furthermore, it is advantageous if the base body of the planet carrier is produced without cutting, for example by primary shaping, in particular by casting. As a result, can achieve a variety of forms that can be produced relatively inexpensively.

It is also advantageous if the torque transmission component is produced without cutting, for example by primary shaping, in particular by casting, which makes it possible to produce complex geometries. In the case of the torque transmission component, too, it is advantageous if complex geometries can be produced.

It is also advantageous if the plate of the planet carrier is formed as a deep-drawn part / as a sheet-metal part, since the plate can be made so particularly inexpensive.

Furthermore, it is expedient if the base body and / or the plate relative to the torque transmitting component are secured by a positive connection against axial displacement / is. As a result, it is also possible to fix the axial position of the components relative to each other so that the planetary gear can not fall apart.

It is also advantageous if the positive connection is formed against axial displacement as a snap connection, as a bayonet connection or as a circlip connection. Thus, the components can be secured against each other simply and inexpensively by existing elements for axial locking with full functionality.

It is also preferred if the main body of the planet carrier is secured against axial movement and / or tangential movement via a form-locking connection with respect to a torque transmission component and the same form-locking connection also secures the plate of the planet carrier against axial movement and / or tangential movement with respect to the torque transmission component. That is, the interlocking connection is designed to prevent both relative axial movement of the body relative to the torque transmitting member and relative axial movement of the disk with respect to the torque transmitting member. This has the advantage that only one securing element is needed to set three separate components axially relative to each other. Thus, on the one hand reduces the number of components required and on the other hand facilitates the manufacture of the component and the assembly.

In addition, it is expedient if the form-locking connection is designed as a snap connection, as a bayonet connection or as a circlip connection, since these connections are easy to assemble and, with a suitable embodiment, allow axial fixing of several, in particular three, components relative to one another.

In a positive locking connection via a circlip connection, it is possible to use the circlip both as an open ring, i. to design with a circumferential gap, as well as a closed ring.

Further, it is advantageous if a locking ring for preventing the axial movement of the base body, the plate and the torque transmitting member relative to each other in the assembled state in first recesses formed in the base body, in second recesses formed in the plate, and in third recesses, which are formed in the torque transmitting member engages, and thereby defines the components axially against each other. As a result, both the base body and the plate relative to the torque transmission component for preventing the axial movement is advantageously determined via a single locking ring.

In addition, it is expedient if the securing ring is designed as an inner retaining ring, d. h., As a locking ring which is compressed during assembly, and in the mounted state in the recesses, which extend from an inner diameter of the component radially outwardly into the component, engages.

In particular, it is preferred if the securing ring is designed as a snap ring, ie with an annular gap / circumferential gap, since this is a standard part, particularly inexpensive and of any size, i. with any diameter and ring width, easy to manufacture.

It is also advantageous if the first recesses, the second recesses and / or the third recesses are formed as grooves with a U-shaped cross-section. This allows the locking ring engage particularly well in the recesses. It is also possible that the grooves have a rectangular or trapezoidal cross-section.

Furthermore, it is advantageous if the first recesses are formed in first positive locking elements for preventing a Relatiwerdrehung against the torque transmitting member in the base body, and / or the second recesses are formed in second positive locking elements for preventing relative rotation with respect to the torque transmitting member in the plate and / or third recesses are formed in Gegenformschlusselemente for preventing relative rotation relative to the base body and / or the plate in the torque transmitting member. Thus, at the same time a positive connection for preventing axial movement and a form-locking connection for preventing axial displacement can be formed on the interlocking elements of the components.

Furthermore, a favorable embodiment is distinguished by the fact that the base body of the planet carrier is produced without cutting, for example by primary shaping, since this way even complex geometries can be produced.

It is also expedient if the plate is designed as a sheet metal component / deep-drawn component. Especially in the interaction of Urformbauteilen, ie casting components / cast components, with sheet metal components, it is particularly difficult to set them axially against each other, since welding is difficult. For this reason, the axial fixing of the components according to the invention is particularly suitable for joining cast components to sheet metal components.

In addition, it is expedient if the first recesses, the second recesses and / or the third recesses extend in their width in the circumferential direction and / or in their depth in the radial direction of the planet carrier. Thus, the components can interact with an inner retaining ring for axial fixing.

It is also advantageous if the first recesses, the second recesses and / or the third recesses have a constant depth, since so the seat of the locking ring is particularly good, since it can rest against a bottom / bottom of the recess / groove.

Furthermore, it is advantageous if the first recesses, the second recesses and / or the third recesses extend radially outward from a radial inner side of the corresponding components. As a result, the locking ring can be easily squeezed by and then inserted by snapping outward into the recesses.

It is particularly advantageous if the interlocking connection defines at least one cast component and at least one sheet metal component relative to one another in the axial direction, since in particular the welding of a cast component with a sheet metal part is very difficult.

• 1 eine Explosionsdarstellung eines erfindungsgemäßen Planetenträgers und eines Drehmomentübertragungsbauteils,
• 2 eine Seitenansicht eines erfindungsgemäßen, montierten Planetengetriebes,
• 3 eine Seitenansicht des Planetengetriebes,
• 4 eine perspektivische Ansicht des Planetengetriebes von einer Rückseite, und
• 5 eine perspektivische Ansicht des Planetengetriebes von einer Vorderseite.

The invention will be explained below with reference to figures. Show it:

• 1 an exploded view of a planet carrier according to the invention and a torque transmission component,
• 2 a side view of a mounted planetary gear according to the invention,
• 3 a side view of the planetary gear,
• 4 a perspective view of the planetary gear from a back, and
• 5 a perspective view of the planetary gear from a front side.

The figures are merely schematic in nature and are for the sole purpose of understanding the invention. The same elements are denoted by the same reference numerals.

1 shows a planetary gear 1 for a motor vehicle with a multipart planet carrier 2 , In the planet carrier 2 is a variety of planetary gears 3 rotatably storable. The planet carrier 2 has a basic body 4 on which at least one plate 5 of the planet carrier 2 is secured axially and rotationally fixed. At the base body 4 are first positive locking elements 6 trained, and at the plate 5 are second positive locking elements 7 educated. In the assembled state, the first positive locking elements engage 6 of the basic body 4 and the second positive locking elements 7 the plate 5 in counter-form elements 8th attached to a torque transmitting member 9 are formed, one to a relative rotation of the body 4 , the plate 5 and the torque transmitting member 9 to prevent each other and to ensure a torque transmission.

At the base body 4 of the planet carrier 2 is also another positive connection 10 trained to the main body 4 opposite the torque transmitting member 9 to secure against axial movement. Here is the positive connection 10 designed so that they too the plate 5 of the planet carrier 2 opposite the torque transmitting member 9 ensures against axial movement, ie a relative axial movement of the plate 5 opposite the torque transmitting member 9 prevented.

The first positive locking elements 6 and the second positive locking elements 7 are formed in the manner of a projection or pin, which in the axial direction toward the torque transmitting member 9 protrudes. The first and second positive locking elements 6 . 7 are on the circumference of a circle around the rotation axis of the planet carrier 2 and in a plane perpendicular to the axis of rotation. The positive locking elements 6 . 7 each have a front surface 11 which extend in the radial direction, that is in a plane which is perpendicular to the axial direction lie. Also, the form-fitting elements 6 . 7 two mutually parallel side surfaces 12 on, which extend in the axial direction, that is in a plane which is perpendicular to the circumferential direction lie.

The counter-form-locking elements 8th of the torque transmitting member 9 are designed in the manner of a recess or notch, extending from a planet carrier 2 facing, axial end surface of the torque transmitting member 9 in the axial direction in the torque transmission component 9 extend into it. The counter-form-locking elements 8th are as a negative mold to the positive locking elements 6 . 7 educated. Accordingly, the counter-form-locking elements 8th Radially extending front surfaces 13 and two parallel side surfaces extending in the axial direction 14 on. When mounted, the front surfaces are located 11 the first and second positive locking elements 6 . 7 at the corresponding front surfaces 13 the counter-form-locking elements 8th and the side surfaces 12 the first and second positive locking elements 6 . 7 on the corresponding side surfaces 14 the counter-form-locking elements 8th at.

About the side surfaces 12 . 14 becomes the torque from the torque transmitting member 9 to the plate 5 and the main body 4 transfer. The front surfaces 11 . 13 serve for axial positioning of the plate 5 , of the main body 4 and the torque transmitting member 9 to each other.

At the first and the second form-fitting elements 6 . 7 are axially projecting centering lugs 15 formed in the mounted state in the counter-form-locking elements 8th engage correspondingly formed Zentrieraussparungen, so that a precise centering of the component 4 . 5 . 9 each other is facilitated.

At the base body 4 and the plate 5 are coordinated, distributed over the circumference stages 16 formed having an axial bearing and a rotationally fixed connection between the plate 5 and the body 4 force.

For mounting the planet carrier 2 become the plate 5 and a support cheek 17 on the body 4 attached or axially joined. Show both the plate 5 as well as the carrier cheek 17 and the main body 4 Ausgleichsradaussparungen 18 , over the differential gears 19 be stored, and planetary gear recesses 20 about which the planetary gears 3 be stored on, which are aligned in the assembled state with each other. Furthermore, in the support cheek 17 mounting holes 21 present over which the beam cheek 17 on the body 4 is attached.

For axial fixing of the body 4 , the plate 5 and the torque transmitting member 9 opposite each other is a positive connection 10 formed, in which a circlip 22 in first recesses 23 attached to the main body 4 are formed in second recesses 24 , which are formed on the plate, and in third recesses 25 in the torque transmitting member 9 are trained, one. The first, second and third recesses 23 . 24 . 25 are formed as grooves.

The circlip 22 has a circumferential gap 26 on so that it is compressed for mounting and from radially inside into the recesses 23 . 24 . 25 can be used. The first, second and third recesses 23 . 24 . 25 have a U-shaped cross-section. The first recesses 23 are in the first positive locking elements 6 formed and the second recesses 24 are in the second positive locking elements 7 educated. The third recesses 25 are in projections that are in the circumferential direction between the Gegenformschlusselementen 8th are arranged, formed.

The first, second and third recesses 23 . 24 . 25 are coordinated so that the circlip 22 in the recesses 23 . 24 . 25 can be used, ie that through the recesses 23 . 24 . 25 a negative mold of the retaining ring in the axially connecting components, namely the plate 5 , the main body 4 and the torque transmitting member 9 , is trained.

2 to 5 show side views and perspective views of the planet carrier 2 on which the planetary gears 3 and the differential gears 19 each with a bolt 27 are stored and the with the torque transmitting component 9 connected is.

LIST OF REFERENCE NUMBERS

1

planetary gear

2

planet carrier

3

planet

4

body

5

plate

6

first positive locking elements

7

second positive locking elements

8th

Against locking elements

9

Torque transmission member

10

Positive connection

11

front surface

12

side surface

13

front surface

14

side surface

15

centering

16

step

17

support flange

18

Ausgleichsradaussparung

19

pinion

20

Planetenradaussparung

21

mounting recess

22

circlip

23

first recesses

24

second recesses

25

third recesses

26

circumferential gap

27

bolt

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 2031654 A [0004]
• DE 3922827 A1 [0005]
• DE 102006018496 A1 [0006]
• DE 10302075 A1 [0007]

Claims (10)

Planetary gear (1) for a motor vehicle, comprising a multipart planet carrier (2) in which a plurality of planet gears (3) is rotatably storable, wherein the planet carrier (2) has a base body (4) on which at least one plate (5) the planet carrier (2) is fixed axially and rotationally fixed, characterized in that the base body (4) first positive locking elements (6) and the plate (5) has second positive locking elements (7), wherein the first positive locking elements (6) and the second Positive locking elements (7) in Gegenformschlusselemente (8) of a torque transmitting member (9) for preventing relative rotation of the base body (4), the plate (5) and the torque transmitting member (9) engage against each other. Planetary gear (1) to Claim 1 , characterized in that the first positive locking elements (6) and the second positive locking elements (7) are arranged in one plane. Planetary gear (1) to Claim 1 or 2 , characterized in that the first positive locking elements (6) and the second positive locking elements (7) are formed identically. Planetary gear (1) according to one of Claims 1 to 3 , characterized in that the first positive locking elements (6) and the second positive locking elements (7) are arranged on the circumference of a circle about the axis of rotation of the planet carrier (2). Planetary gear (1) according to one of Claims 1 to 4 , characterized in that in the assembled state side surfaces (12) of the first positive locking elements (6) and the second positive locking elements (7) with side surfaces (14) of the Gegenformschlusselemente (8) for torque transmission in abutment. Planetary gear (1) according to one of Claims 1 to 5 , characterized in that in the assembled state front surfaces (11) of the first positive locking elements (6) and the second positive locking elements (7) with front surfaces (13) of the Gegenformschlusselemente (8) for axial positioning in abutment. Planetary gear (1) according to one of Claims 1 to 6 , characterized in that the base body (4) is produced by prototyping. Planetary gear (1) according to one of Claims 1 to 7 , characterized in that the plate (5) is formed as a sheet metal component. Planetary gear (1) according to one of Claims 1 to 8th , characterized in that the base body (4) and / or the plate (5) against the torque transmission member (9) by a positive connection (10) are secured against axial and / or tangential displacement / is. Planetary gear (1) to Claim 9 , characterized in that the positive connection (10) is designed as a snap connection, as a bayonet connection or as a circlip connection.

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