DE102009039993A1 - Transmission arrangement for crank-continuously variable transmission of motor vehicle, has drive shaft comprising independent and different individual parts, which are connected together in torque proof, centrical and axial manner - Google Patents

Abstract

The arrangement has a drive shaft (20) provided with a radial recess via which external teeth of an adjustment shaft stands in connection with internal teeth of a recess of an eccentric cam component (46), where the drive shaft is arranged in a transmission housing. A bearing for supporting a piston rod part is arranged on the outer circumference of the eccentric cam component. The drive shaft has a set of independent and different individual parts e.g. cam part (42), which are connected together in a torque proof, centrical and axial manner.

Description

The The present invention relates to a transmission assembly for a continuously variable transmission, in particular for a crank CVT of a motor vehicle and a motor vehicle with such a gear arrangement.

From the DE 102 43 535 A1 goes out such a continuously variable transmission of a motor vehicle, which essentially comprises a drive shaft and an output shaft, which are aligned parallel to each other rotatably mounted in a transmission housing. In this case, the drive shaft and the output shaft are connected to one another via an eccentric device provided on the drive shaft, a freewheel device arranged on the output shaft and a connecting rod device arranged between the eccentric device and the freewheel device. The eccentric consists of a plurality of eccentric units, which are arranged axially next to one another on the drive shaft. The freewheel device consists of several freewheel units, which are arranged axially adjacent to each other on the output shaft. Correspondingly, the connecting rod device comprises a plurality of connecting rod parts, which each connect an eccentric unit and a freewheel unit.

In this case, the drive shaft 1 according to the 1 and 2 integral with it, opposite its axis of rotation 3 eccentrically offset cam areas 4 on, on their lateral surfaces 2 in each case a two-part eccentric component 5 is rotatably mounted. In the 1 and 2 are the two parts of the Exzenterbauteils 5 With 5 ' and 5 '' designated. On the eccentric component 5 is the one side of at least one Pleuelteiles 7 or a connecting rod rotatably mounted.

Each eccentric component 5 has a recess for receiving the cam portion 4 , wherein around the recess an internal toothing 6 runs. The internal toothing 6 is on the lateral surface 2 of the cam part 4 adjusted so that the eccentric component 5 over the internal toothing 6 on the cam part 4 is centered. The drive shaft 1 or the cam areas 4 the same point in the direction of the axis of rotation 3 the drive shaft 1 extending recess 8th on, in which an adjusting shaft 9 is arranged rotatable. The adjusting shaft 9 has an external toothing 10 in the internal toothing 6 the eccentric components 5 intervenes. The adjusting shaft 9 is about the head circle of the external toothing 10 forming sections of the external toothing 10 in the recess 8th the drive shaft 1 stored. The cam areas 4 are formed so crescent-shaped that their recesses are open over a certain angular range, so that in these open angle regions the external teeth 10 the adjusting shaft 9 opposite the outer lateral surface 2 the cam areas 4 protrudes radially, with an engagement in the internal toothing 6 of the eccentric component 5 is possible.

The cam areas 4 possess with respect to their cylindrical surface 2 a midline 16 , which are at a certain distance from the axis of rotation 3 the drive shaft 1 is arranged eccentrically. The eccentric components 5 possess in relation to their cylindrical lateral surfaces 12 a midline 17 that face the aforementioned center line 16 the cam areas 4 eccentrically offset by a distance so that the eccentricity of the center line 17 the eccentric components 5 opposite the axis of rotation 3 the drive shaft 1 twice as large as the eccentricity of the midline 16 the cam areas 4 opposite to this axis of rotation 3 ,

By the rotation of the adjusting 9 in the recess 8th the drive shaft 1 becomes the eccentric component 5 around the centerline of the corresponding cam area 4 twisted. The midline wanders 17 of the eccentric component 5 around the midline 16 of the cam area 4 , wherein the extent of the eccentricity of the Exzenterbauteils 5 in relation to the axis of rotation 3 the drive shaft 1 is changed.

A problem of the known drive arrangement is that the drive shaft 1 has a very complex component design, since it is not rotationally symmetric. As already mentioned, exist in the known gear arrangement, the Exzenterbauteile 5 in the from the 1 and 2 apparent way of two parts 5 ' and 5 '' , For arranging a rolling bearing 13 for storage of the connecting rod part 7 on the eccentric component 5 is therefore an inner ring 14 required, which is a raceway for the rolling elements 31 of the rolling bearing 13 having. In the 1 and 2 is the outer ring of the rolling bearing 13 With 15 designated.

The Object of the present invention is a transmission assembly to create, which is relatively simple and therefore cost-effective can be produced.

This object is achieved by a gear arrangement for a continuously variable transmission, in particular for a crank CVT of a motor vehicle, with a drive shaft which is rotatably mounted in a transmission housing. The drive shaft in this case has an axial recess in which a rotatable by means of a drive unit adjusting shaft is rotatably arranged. When the latter is rotated, at least one eccentric component, which has an eccentric recess, is infinitely adjustable via a crescent-shaped cam part. The drive shaft further has at least one radial recess has, through which an external toothing of the adjusting shaft with an internal toothing of the recess of the eccentric component is in communication. On the outer circumference of the Exzenterbauteils a bearing for supporting the Pleuelteiles is arranged. The drive shaft consists of at least three separate and different items, which are rotatable and centered and axially connected to each other. The cam part is one of the standalone items.

Of the The essential advantage of the present invention is that because of the rotationally symmetrical design of the items Drive shaft significantly simplifies the manufacture of the gear assembly and therefore can be made cheaper.

When independent individual parts for the drive shaft serve next to the at least one cam part two side plates. These two side plates are usually designed differently, because the demands on the geometric conditions and / or the required bearings differ. From the one side is namely the drive unit for provided the adjusting shaft and the axial recess of the drive shaft is open on this page.

In a preferred development, the drive shaft as another Item at least one holding plate on, with which the Drive unit facing away from side plate in the axial direction alternately in each case a cam part and a retaining plate and to the last eccentric component as conclusion of the drive shaft, the drive unit facing side plate connect. It is particularly advantageous if the cam parts and the side plates are each the same components. It is also possible, in each case a cam part and a side plate as to perform one-piece component. In this case Halves the number of joints in the drive shaft. This can In some cases, the strength of the Drive shaft impact.

In An advantageous embodiment of the invention, one of the holding plates be designed as a center plate, which an additional Drive shaft bearing, generally a purely radial bearing can carry. The side plates are then with shots for the other drive shaft bearings equipped, both to absorb axial and radial loads. For receiving the bearings are cylindrical areas on the side plates and on the center plate intended. As a bearing can both sliding and rolling bearings be used.

In An advantageous development of the transmission arrangement are between the individual parts of the drive shaft respectively centering and / or fitting devices are provided. These can be made from spigots in the one item and mating recesses formed in the other component be. Alternatively, also dowel pins and corresponding passport sockets conceivable.

The Individual parts of the drive shaft are preferably by means of screws connected with each other. When using pins and matching recesses Can the pins with a threaded hole for Be provided bolt. Furthermore, alternatively or additional fitting screws used for centering become.

For transmission the torque between the components of the drive shaft must this be provided with a torque-transmitting device. As torque-transmitting devices For example, gears can serve. Also mentioned Pins and / or screw connections are for takeover suitable for this task.

The Drive shaft is constructed in sections, that is for example, starting with a side plate will be on this one Cam part centered and created by means of a centering device, then a holding plate is centered and created, Thereafter, the connection of these three parts is preferably by means of a screw connection. The drive shaft is then built further, by the steps of applying another cam part and a repeated holding plate and then screwing repeated until the end of a side plate is installed. A The holding plates can be replaced by a center plate. In the course of this stepwise construction of the drive shaft is the cam part before creating another component freely accessible from one side. Thus, the radially surrounding the cam parts eccentric component be executed in one piece. In a one-piece drive shaft, at the time the cam parts are not axially accessible at any time are, the eccentric component must be split. Such split eccentric components are more expensive and complicated in production. An additional advantage of the one-piece Eccentric component is that because of its uninterrupted radial Outer surface to be attached to the outer circumference Bearings for storage of the connecting rod no separate inner ring needed. When using a rolling bearing, the rolling elements So roll directly on the outer peripheral surface of the Exzenterbauteils.

The modular design of the drive shaft allows the individual components can be made of different materials according to their load. The items can also be made with different manufacturing processes to their properties to the difference to adapt to different requirements. Thus, for example, sheet metal parts, forged parts, investment castings and so on can be combined as needed.

in the Below, the inventions and their embodiments are related explained in more detail with the figures. It show in simplified, partly schematic representation:

1 a cross section of a known transmission arrangement;

2 an exploded view of the known gear arrangement according to 1 ;

3 a three-dimensional representation of the drive shaft with the cam portions of the known gear arrangement according to 1 ;

4 a three-dimensional view of a drive shaft of a transmission arrangement according to the invention;

5 a three-dimensional representation of a cam member;

6 an exploded view of a drive shaft according to the invention;

7 an exploded view of another drive shaft according to the invention;

8th a three-dimensional view of an eccentric component;

9 a three-dimensional representation of a drive shaft of a transmission assembly according to the invention in the state of maximum translation and

10 a three-dimensional representation of a drive shaft of a transmission assembly according to the invention in the state of minimal translation.

Same or similar parts are in the figures with the same reference numerals Mistake.

The following will be related to the 4 to 10 Gear arrangements according to the invention explained. Such consists essentially, as in particular the 4 . 6 . 7 . 9 and 10 show, from a drive shaft 20 ; 200 around a rotation axis 21 is rotatable, at least one cam part 42 ; 70 ; 71 ; 72 , which is designed approximately crescent-shaped and with its inner circumference a portion of the outer periphery of the drive shaft 20 ; 200 encloses, an eccentric component 46 , which is formed in one piece and circular disk-shaped, and on the cam member 42 ; 70 ; 71 ; 72 , is arranged eccentrically. In the 4 . 6 . 7 and 10 the eccentric component is not shown for clarity. If this is carried out in one piece as described above, it must, of course, before the assembly of the items 41 ; 42 ; 43 ; 44 ; 48 each over the cam part 42 ; 70 ; 71 ; 72 to be pushed. When using a split eccentric component whose assembly can also be done after assembly of the drive shaft. The assembly of the individual parts of the drive shaft 20 done by means of fittings 44 ; 45 between the side plates 40 ; 41 and the holding plates 48 or between the holding plate and the center plate 43 , In the in the 7 and 10 illustrated drive shaft 200 The screwing of the individual parts takes place between the side plates 40 ; 41 and double cam parts 70 as well as between the holding plates 48 and the double cam parts 70 or a center cam plate.

In the figures, to simplify the drawings and in the recess 8th arranged adjusting shaft, which on the cylindrical areas 410 ; 420 ; 430 the side parts 40 . 41 and the middle part 43 provided bearing on the outer circumference of the Exzenterbauteils 46 arranged bearings and a connecting rod. or a connecting rod, which on the outside of the bearing on the Exzenterbauteil 46 is arranged, not shown. According to the 4 . 6 . 7 and 9 are six cam parts 42 and the corresponding eccentric components and rolling bearings axially next to each other on the drive shaft 20 intended.

In one in the direction of the axis of rotation 21 extending recess 8th the drive shaft 20 an adjusting shaft is arranged, which along a partial area through a recess 8th the drive shaft 20 through with the Exzenterbauteil 46 drivingly connected. For this purpose, the adjusting shaft preferably has one in the direction of the axis of rotation 21 extending, at least partially provided external teeth, which in an internal toothing 47 of the eccentric component 46 intervenes.

6 shows the drive shaft 4 in an exploded view. It can be seen that the side plates 40 ; 41 , the holding plates 48 and the center plate 43 on both sides of their axial side surfaces with centering pins 52 ; 53 are provided, which in corresponding recesses 50 ; 51 of the cam part ( 5 ) can intervene. The centering pins serve this purpose 52 fixing the position while the centering pins 53 to ensure a positioning. The in the illustration of the figures on the left axial side surface of the side, holding and center plate mounted centering pins have a thread which is used to hold the bolt threads of the screw 44 ; 45 are provided. The centering pins can also be used as a torque-transmitting device, but such a large bias is preferred by means of the fittings 44 ; 45 that the transmission of torque within the built drive shaft 20 is guaranteed.

8th shows a one-piece, disc-shaped Exzenterbauteil 46 with the internal toothing 47 in an eccentric recess of the eccentric component 46 for engagement in the adjusting shaft. The lateral surface 12 is intended for receiving a connecting rod bearing. As the eccentric component 46 has the form of a one-piece circular disk, when using a roller bearing as a connecting rod bearing, the track for the rolling elements of the connecting rod bearing directly in or on the outer circumference 12 of the eccentric component 46 be arranged. In the corresponding manner, the outer raceway for the rolling elements may be provided directly in or on the inner circumferential surface of the recess of the one end of the Pleuelteiles.

In 7 a further embodiment of the invention is shown. The difference to the embodiment according to 6 is that the drive shaft 200 only two holding plates 48 contains. A center plate 71 is equipped with two integrated cam elements on both sides 72 provided and the side plates 40 ; 41 adjacent components are double cam parts 70 with angularly arranged cams. Furthermore, on the centering pin 53 omitted, the thread for the bolt 45 is right in the side plate 41 , the center plates 48 or the cam elements 72 intended. The advantage of this embodiment is that the drive shaft 200 with six cams only six joints identifies. The drive shaft 20 to 4 . 6 and 9 on the other hand has twelve joints on six cams. A smaller number of joints may under certain circumstances justify a better strength or rigidity of the drive shaft.

9 is a similar view of the drive shaft as in 4 In contrast, here also the Exzenterbauteile 46 are shown in the installed state. The adjustment of the eccentric is maximum.

10 shows the embodiment of the drive shaft 200 out 7 in the assembled state.

1

drive shaft

2

lateral surface

3

axis of rotation

4

cam range

5

eccentric

5 '

part of eccentric component

5 ''

part of eccentric component

6

internal gearing

7

connecting rod

8th

recess

9

adjusting

10

external teeth

12

lateral surface

13

roller bearing

14

inner ring

15

outer ring

16

center line

17

center line

20

drive shaft

21

axis of rotation

31

rolling elements

40

side plate

41

side plate

42

cam member

43

center plate

44

bolt

45

bolt

46

eccentric

47

internal gearing

48

holding plates

50

recess

51

recess

52

spigot

53

spigot

60

recess

70

Double cam part

71

Means cam plate

72

cam member

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10243535 A1 [0002]

Claims (15)

Gear arrangement for a continuously variable transmission, in particular for a crank CVT of a motor vehicle, with a drive shaft ( 20 ; 200 ) which is rotatably mounted in a transmission housing, wherein the drive shaft ( 20 ; 200 ) an axial recess ( 8th ), in which a rotatable by means of a drive unit adjusting shaft is rotatably arranged, at the rotation of which at least one eccentric component ( 46 ), which has an eccentric recess, via a crescent-shaped cam part ( 42 ; 70 ; 72 ) is infinitely adjustable, wherein the drive shaft ( 20 ; 200 ) further at least one radial recess ( 60 ), through which an external toothing of the adjusting shaft with an internal toothing ( 47 ) of the recess of the eccentric component ( 42 ), and wherein on the outer periphery of the eccentric ( 42 ) a bearing for supporting a connecting rod part is arranged, characterized in that the drive shaft ( 20 ; 200 ) consists of at least three separate and different parts, which are rotationally fixed and centered and axially connected to each other, and wherein the cam part ( 42 ; 70 ; 72 ) is one of the standalone items. Gear arrangement according to claim 1, characterized in that the drive shaft ( 20 ; 200 ) from a first drive unit facing side plate ( 40 ), a second, the drive unit facing away from side plate ( 41 ) as well as the cam part ( 42 ; 70 ; 72 ) consists. Gear arrangement according to claim 2, characterized in that the drive shaft ( 20 ; 200 ) as a further item at least one retaining plate ( 48 ), wherein on the side facing away from the drive unit side plate ( 41 ) in the axial direction alternately one cam part ( 42 ; 70 ) and a retaining plate ( 48 ) and the last cam part ( 42 ; 70 ) as the completion of the drive shaft ( 20 ; 200 ) the drive unit facing side plate ( 40 ) connect. Gear arrangement according to claim 3, characterized in that the cam parts ( 42 ; 70 ) and the retaining plates ( 48 ) of the drive shaft ( 20 ; 200 ) are each equal components. Gear arrangement according to claim 3, characterized in that in each case a cam part and a retaining plate is a one-piece component ( 70 ) form. Gear arrangement according to claim 5, characterized in that the drive shaft ( 20 ; 200 ) at least two integral parts ( 70 ), wherein the one-piece components are Gleichbauteile. Gear arrangement according to one of claims 3 to 6, characterized in that a substantially provided in the center of the drive shaft retaining plate by a center plate ( 43 ; 71 ) is replaced. Gear arrangement according to one of the preceding claims, characterized in that it has side plates ( 40 ; 41 ) cylindrical areas ( 400 ; 410 ) for receiving bearings. Gear arrangement according to claim 7, characterized in that the side plates ( 40 ; 41 ) and the center plate ( 43 ; 70 ) cylindrical areas ( 430 ) for receiving bearings. Gear arrangement according to one of the preceding claims, characterized in that between the individual parts of the drive shaft ( 20 ; 200 ) each centering and / or fitting devices are provided. Gear arrangement according to one of the preceding claims, characterized in that the individual parts of the drive shaft ( 20 ; 200 ) are interconnected by means of a screw connection. Gear arrangement according to one of the preceding claims, characterized in that between the individual parts of the drive shaft ( 20 : 200 ) each torque-engaging devices are provided. Gear arrangement according to one of the preceding claims, characterized in that the eccentric component ( 46 ) is made in one piece. Gear arrangement according to one of the preceding claims, characterized in that the cam parts ( 42 ; 70 ; 71 ) and / or the side plates ( 40 ; 41 ) and / or the center plate ( 48 ; 71 ) are made of different materials. Motor vehicle with a transmission arrangement according to a of the preceding claims.