DE102011004626A1 - Wheel of drive axle in motor vehicle, has built-in planetary ring comprising ring gear whose second component is pressed on cutting tooth running gear forming locking torque transmitting portion - Google Patents

Abstract

The wheel (1) has built-in planetary gear (2) with sun gear (3), planet gears (4), planet carrier (5) and ring gear (6). The ring gear is fixed to housing. The drive of the planetary gear through the sun gear is performed, so that the output is combined at the wheel hub (7), and planet carrier. The ring gear has two interconnected components (9,12) among which one component (9) has internal teeth (10) for realizing the ring gear function. The second component (12) is pressed on the cutting tooth running gear (11) forming locking torque transmitting portion.

Description

The invention relates to a wheel drive with an integrated planetary gear, in particular for a wheel of a driven axle of a motor vehicle according to the preamble of patent claim 1.

Wheel drives with an integrated planetary gear are known from the prior art. For example, goes from the DE 199 22 651 A1 the Applicant a steerable wheel drive forth, in which a drive motor drives an inner central gear of a first planetary stage, which drives an inner central gear of a second planetary stage, wherein the planet carrier forms the drive. It is provided that between the planetary stages, a brake is arranged, the inner disks are connected to the planet carrier of the first planetary stage and that the bearing of the wheel is arranged in the axial direction between the planetary stages and the drive motor. The brake discs of the brake are on the one hand on the planet carrier of the first planetary stage and on the other hand in a non-rotatable member which is in communication with the two ring gears of the planetary gear arranged.

Furthermore, goes from the DE 10 2008 000 445 A1 a wheel drive with an integrated planetary gear out, which comprises a formed as a sun shaft drive shaft with a sun gear, planetary gears, a planet carrier and a ring gear, wherein the planet carrier is cup-shaped and designed as an output. In the known wheel drive is provided that the ring gear has at least two non-detachably interconnected components; the two components of the ring gear are preferably positively connected to each other by non-cutting deformation. Furthermore, according to the DE 10 2008 000 445 A1 be provided that the ring gear is additionally designed as a carrier of a multi-disc brake.

The present invention has for its object, starting from a wheel drive according to the DE 10 2008 000 445 A1 to provide a wheel drive with an integrated planetary gear, in particular for a wheel of a driven axle of a motor vehicle, which is inexpensive to produce and assemble.

This object is solved by the features of patent claim 1. Further embodiments and advantages of the invention will become apparent from the dependent claims.

Accordingly, a wheel drive with an integrated planetary gear proposed with a sun gear, planetary gears, a planet carrier and a ring gear, wherein the drive of the planetary gear through the sun gear and the output is effected by the planet carrier, which is connected to the wheel hub, wherein the ring gear is fixed to the housing ,

In this case, the ring gear comprises two interconnected components, wherein the first component has an internal toothing for the realization of Hohlradfunktion and another, designed as a cutting teeth toothing, which is pressed onto the second component, whereby a positive torque-transmitting connection is formed. The second component serves as Hohlradträger.

Here, the second component has a rotated outer diameter, which is greater than the inner diameter of the cutting teeth of the first component. The teeth of the cutting teeth of the first component intersect by the pressing of the first component on the second component in the material of the rotated outer diameter of the second component, whereby a positive connection is established. The second component is rotatably connected to a non-rotatable housing of the wheel drive.

According to the invention, the axial fixing of the first and the second component to each other by a securing ring, which is arranged in corresponding grooves of the first and the second component; when pressing the first component on the second component of the retaining ring is currently widened and then snaps into the corresponding groove. The positive connection between the first and the second component is not destructive solvable.

In a further embodiment of the invention, the second component may be designed as a carrier of the outer disk of a multi-disc brake; The inner disks are rotatably connected to the sun gear shaft. The first component remains unchanged according to the invention in an advantageous manner.

Here, the outer plates are held in the second component against rotation in casting or forgechnisch spanlos preformed recesses. The outer disks preferably have at least one toothing, which can be mounted in a corresponding recess of the second component through the inner toothing of the first component; the torque support is effected via the outer flanks of the teeth resting on the second component of the toothing of the outer disks.

By this configuration, the diameter of the outer disk can be kept large in an advantageous manner. Preferably, the second component has three recesses, which are distributed uniformly around the circumference of the component, wherein the Outer plate on its outer diameter have three corresponding teeth.

Furthermore, it is provided within the scope of a development of the invention that the first and the second component form a groove after assembly, which serves to receive a locking ring for axially securing a step disc, which in the event that the second component, the outer plates of a multi-disc brake carries, serves as an end plate of the disk set; this eliminates the need for machining this groove.

The fact that the first component of the ring gear is not changed for an embodiment with a multi-disc brake, the production costs are significantly reduced, especially at high volumes.

The first component of the ring gear is preferably heat treated; in a more advantageous manner, the second component of the ring gear in the embodiments with and without a multi-disc brake requires no heat treatment, whereby heat treatment costs are saved. The second component can be made of a less expensive material. Furthermore, the first component can be manufactured by ring rolling, whereby the manufacturing costs are further reduced.

The invention will be explained in more detail below with reference to the accompanying figures, wherein the same reference numerals are used for the same components. Show it:

1 : A schematic sectional view of a first embodiment of a wheel drive according to the invention;

2 a schematic sectional view of a second embodiment of a wheel drive according to the invention, in which the second component of the ring gear is designed as a carrier of the outer disk of a multi-disc brake;

3 FIG. 4 is an exploded perspective view of the embodiment of the first and second components of the ring gear and the arrangement of the outer disks in an embodiment according to FIG 2 ;

4 : a schematic representation for illustrating the arrangement of the outer disk in the second component of the ring gear in the mounted state; and

5 a further schematic representation to illustrate the arrangement of the outer disk in the second component of the ring gear in the mounted state.

In 1 is a wheel drive 1 with an integrated planetary gear 2 shown, which is a sun wheel 3 , Planetary gears 4 , a planet carrier 5 and a ring gear 6 having. The drive of the planetary gear 2 done by a sun gear shaft 3 , where the output by the planet carrier 5 done with the wheel hub 7 connected is.

The ring gear 6 is fixed to the housing and comprises two interconnected components 9 . 12 , wherein according to the invention, the first component 9 an internal toothing 10 for the realization of Hohlradfunktion and another, designed as a cutting toothing 11 that points to the second component 12 , which serves as Hohlradträger, is pressed, whereby a positive torque-transmitting connection is formed. The second component 12 is with a non-rotatable housing 26 of the wheel drive 1 rotatably connected.

In this case, the axial fixation of the first and the second component takes place 9 . 12 of the ring gear 6 to each other by a locking ring 13 that in corresponding grooves 14 . 15 the first and the second component 9 . 12 is arranged; the mounting of the circlip 13 takes place in that when pressing the first component 9 on the second component 12 the circlip 13 is currently expanded, then snap into the corresponding groove.

In the context of a further embodiment of the invention, the second component 12 as a carrier of the outer plates 16 a multi-disc brake, wherein the inner plates 17 with the sun gear shaft 3 are rotatably connected and the first component remains unchanged in an advantageous manner. This embodiment is the subject of 2 . 3 and 4 ,

Here are the outer plates 16 in the second component 12 against rotation in at least one pouring or forging technically non-cutting preformed recess 18 held. The outer disks 16 have at least one and preferably, as in 3 shown, three evenly on the outer circumference of the outer disk 16 distributed external gears 19 on that by the internal toothing 10 of the first component 9 through into the corresponding recess 18 of the second component 12 can be mounted. In 2 and 3 is the piston for actuating the multi-disc brake by the reference numeral 27 Mistake.

As based on 4 illustrates the torque support via the outer edges of the second component 12 adjacent teeth 20 . 21 the respective external toothing 19 the outer lamellae 16 ,

Based 5 It illustrates that when assembling the outer plates 16 this through the internal toothing 10 of the first component 9 of the ring gear 6 be performed to realize the Hohlradfunktion.

How out 2 can be seen form the first and the second component 9 . 12 of the ring gear 6 after mounting a groove 22 , which is the inclusion of a part of a circlip 23 for the axial securing of a step disc 24 serves, which serves as an end plate of the disk set of the multi-disc brake. By executing the end plate of the plate pack as a step disc, the groove 22 extended radially inward, so that the circlip 23 in the assembled state viewed radially between the small outer diameter 25 the step disc 24 and the second component 12 is arranged.

LIST OF REFERENCE NUMBERS

1

Wheel Drive

2

planetary gear

3

sun

4

planet

5

planet carrier

6

ring gear

7

wheel hub

9

first component of the ring gear 6

10

internal gearing

11

cutting teeth

12

second component of the ring gear 6

13

circlip

14

groove

15

groove

16

outer plate

17

inner plate

18

recess

19

external teeth

20

tooth

21

tooth

22

groove

23

circlip

24

Step washer

25

small outside diameter of the step disc 24

26

non-rotatable housing

27

piston

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 19922651 A1 [0002]
• DE 102008000445 A1 [0003, 0003, 0004]

Claims (6)

Wheel drive ( 1 ) with an integrated planetary gear ( 2 ), which has a sun gear shaft ( 3 ), Planet gears ( 4 ), a planet carrier ( 5 ) and a ring gear ( 6 ), wherein the ring gear ( 6 ) is fixed to the housing, the drive of the planetary gear ( 2 ) through the sun gear shaft ( 3 ) and the output through the wheel hub ( 7 ) connected planet carrier ( 5 ) and wherein the ring gear ( 6 ) two interconnected components ( 9 . 12 ), characterized in that the first component ( 9 ) an internal toothing ( 10 ) for the realization of the Hohlradfunktion and another, running as a cutting toothing ( 11 ), which on the second component ( 12 ), which serves as Hohlradträger, is pressed, whereby a positive torque-transmitting connection is formed. Wheel drive ( 1 ) with an integrated planetary gear ( 2 ) according to claim 1, characterized in that the axial fixation of the first and the second component ( 9 . 12 ) of the ring gear ( 6 ) to each other by a retaining ring ( 13 ), which in corresponding grooves ( 14 . 15 ) of the first and the second component ( 9 . 12 ) is arranged. Wheel drive ( 1 ) with an integrated planetary gear ( 2 ) according to claim 2, characterized in that the second component ( 12 ) as a carrier of the outer disks ( 16 ) is carried out a multi-disc brake, wherein the inner plates ( 17 ) with the sun gear shaft ( 3 ) are rotatably connected and the first component ( 9 ) remains unchanged. Wheel drive ( 1 ) with an integrated planetary gear ( 2 ) according to claim 3, characterized in that the outer plates ( 16 ) in the second component ( 12 ) against rotation in at least one casting or forging technology without cutting preformed recess ( 18 ), the outer disks ( 16 ) on the outer diameter at least one outer toothing ( 19 ), which by the internal toothing ( 10 ) of the first component ( 9 ) through into the corresponding recess ( 18 ) of the second component ( 12 ) is mountable. Wheel drive ( 1 ) with an integrated planetary gear ( 2 ) according to claim 4, characterized in that the torque support via the outer flanks of the second component ( 12 ) adjacent teeth ( 20 . 21 ) of the respective external toothing ( 19 ) of the outer disks ( 16 ) he follows. Wheel drive ( 1 ) with an integrated planetary gear ( 2 ) according to claim 3, 4 or 5, characterized in that the first and the second component ( 9 . 12 ) of the ring gear ( 6 ) after mounting a groove ( 22 ) forming part of a retaining ring ( 23 ) for the axial securing of a step disc ( 24 ), which serves as the end plate of the disk set of the multi-disc brake.

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