DE102009036882A1 - Cone pulley arrangement for a cone pulley CVT transmission and pulley CVT transmission - Google Patents

Abstract

A conical disk arrangement for a continuously variable bevel gearbox includes a shaft and a pair of conical disks with a first conical disk and a second conical disk opposite the first conical disk in the axial direction of the shaft, wherein the first conical disk is fastened to the shaft so as to be rotationally fixed in the axial direction and fixed on the shaft Shaft is held by a tapered press fit.

Description

The The invention relates to a conical disk arrangement for a Cone pulley CVT transmission and a cone pulley CVT transmission as continuously variable transmission, in particular for a Motor vehicle.

One Cone pulley CVT gearbox each faces an input shaft and an output shaft of the transmission on a cone pulley pair. One of the conical disks of the pair is non-rotatable and in the axial direction the shaft held fixed on the shaft or fixed while the other cone pulley in the axial direction relative to the first Cone pulley is adjustable. The conical disks thus define one with respect to its width in the axial direction changeable Ring between them, due to the conical shape of the conical discs, in particular their facing surfaces, in radially outward expands. In this ring, d. H. The area between the two conical disks is a belt introduced a power transmission connection between the cone pulley pair of the drive side and the cone pulley pair the output side produces. Depending on the current width of the annular gap, in which the wrapping means is, is the wrapping means on one of the shafts radially further inward or further out in Appendix. The radial position of the belt on the Drive side or the output side is changed by the distances of the conical disks of the cone pulley pairs the drive side and output side opposite to each other adjusted. This will translate the pulley CVT transmission changed and adjusted. By a contact force, the is applied to the adjustable conical disk and transferred to the belt is, the belt is held so that it is in the Essentially unintentionally in the radial direction does not shift and thus transmitting a force between the drive shaft and the output shaft can.

When Adjustment mechanism for the movable cone pulley comes For example, a hydraulic adjustment mechanism into consideration, in which the adjustable cone pulley on the fixed conical disk opposite side embraced by a supporting cylinder wall is and thus so tight, but relatively displaceable connected is that in a space between the supporting cylinder wall and the adjustable cone pulley hydraulic fluid supplied and removed can be and thus on the one hand the adjustment of the conical disk can be effected and on the other hand, the necessary contact pressure be provided on the belt in the axial direction can. The supporting cylinder wall is in the axial direction firmly provided on the associated shaft.

The components fixed in the axial direction, namely the first conical disk fixed in the axial direction and a supporting cylinder wall, are conventionally held in a positionally stable manner against the pressing force by using shaft shoulders in the axial direction. For this purpose, corresponding shoulders are provided on the shaft, against which a radially inner region of the fixed conical disk or the cylinder support wall abuts and rests, wherein the contact force acts such that it presses the conical disk or the cylinder support wall further against the shaft shoulder. Such an arrangement is for example in the documents US 6,506,136 B2 and EP 0 777 069 B1 shown.

The The shaft must be very solid in the area of the shaft shoulder be so that it has sufficient strength, since the Shaft heel, especially its corner area, by the acting contact forces is charged very high. It also brings training Of wave heels often Kerbesstellen with them to be able to produce, which in turn disadvantageous affect the strength of the shaft.

From that It is an object of the invention, a conical disk arrangement for a continuously variable bevel gear create, in which the storage of the positionally held in the axial direction Elements on the shaft have no or only minor disadvantages the strength of the time brings with it. In addition, should a corresponding cone pulley CVT transmission can be provided.

These Task is with a conical disk arrangement with the features of claim 1. A cone pulley CVT transmission is specified in claim 12. Preferred embodiments are defined by the dependent claims.

The proposed arrangement is equally for the arrangement of the cone pulley pair on the drive shaft as well the output shaft suitable.

The invention is based on the idea of supporting the fixed conical disk and, as required, a cylinder supporting wall by means of an interference fit on the shaft. For the conical disk, a conical interference fit is recommended in order to be able to support the high required contact forces. The supporting cylinder wall can be achieved either by a press fit or a transitional fit between cylinder surfaces when manufactured with appropriate tolerance or by any other suitable attachment. As a result, there is no need to provide a stepped area in the shaft with stepped transitions of large diameter areas and small diameter areas. Rather, it is sufficient, the shaft partially conical with relatively form small cone angle, so that no sharp-edged transitions and no abrupt changes in diameter are required. Also, the conical disk is not in abutment against an end face, which has a larger diameter with respect to the shaft and must be designed to receive the contact forces.

So includes a conical disk arrangement for a stepless adjustable cone pulley transmission one shaft and one on the shaft stored cone pulley pair with a first cone pulley and a second conical disk, which is the first conical disk in the axial direction opposite the shaft. The first cone pulley is on the shaft rotatably mounted and fixed in the axial direction, while the second conical disk slidable to the first conical disk in axial direction is mounted on the shaft. The first cone pulley is held on the shaft by a tapered press fit.

Thereby It is possible to have a shaft shoulder in the area of the attachment avoid the first cone pulley so that no to the shaft Notch effect or another weakening occurs. Much more it is sufficient if the facing surfaces, d. H. the inner peripheral surface of the cone pulley and the directed thereto outer circumferential surface of the shaft, at least partially shaped so that they have a cone angle enclose with each other, the press fit of the cone pulley on the wave allows.

To the cone angle is preferably chosen so that a Self-locking in the press seat area arises. This can be a safer Seat of the conical disk can be ensured on the shaft.

To a preferred embodiment includes the Cone angle between the inner peripheral surface and the outer peripheral surface preferably an angle of 3 to 5 degrees. Both surfaces can be tapered, each with different cone angles be, so preferably between the two surfaces gives a cone angle in the preferred range of 3 to 5 degrees. In the installed, compressed state, equal angles set.

To a preferred embodiment is the pressing force between the conical disk and the shaft during assembly at least as large as the maximum operating force occurring during operation on the belt, creating a secure position of the cone pulley independent in the axial direction with respect to the shaft can be guaranteed by the operating condition. The cone pulley can not be moved during operation.

To a preferred embodiment is the inner peripheral surface the first cone pulley resting on the outer peripheral surface the shaft is directed, next to the conical disk press seat area provided with a cylindrical centering region, wherein the outer peripheral surface area the shaft also has a cylindrical centering seat. Thereby The cone pulley can be centered in the radial direction on the shaft be held securely and pressed on.

If such centering and centering are provided, has preferably on the conical disk centering a smaller diameter on than the conical conical disk press fit. After a preferred Embodiment, the conical disk is further on its end face, in particular the front side on which the contact pressure of the belt acts and thus also apply the Aufpresskraft on the shaft is, d. H. preferably that of the other, second conical disk facing Front side, provided with a flat surface area, the a preferably substantially perpendicular to the axial direction of the shaft Surface forms. With this flat surface, the Conical disk pressed well and reliably onto the shaft become.

at the cone pulley arrangement is preferably at the second cone pulley, which is adjustable in the axial direction, a Zylinderabstützwand provided, which supports the applied to the second cone pulley adjusting force. The Zylinderabstützwand is thus also in the axial Direction firmly held on the shaft.

To In a preferred embodiment, the cylinder support wall is held on the shaft by a press fit, preferably a pressure between two custom-made cylindrical surfaces with circular cylindrical cross section, is achieved.

The Cylinder support wall may further preferably additionally by welding or for example a split retaining ring or any other fastener on the shaft.

In a preferred embodiment of the invention, the cylinder support wall serves to adjust the distance between the two conical disks. In the ground state of the conical-pulley belt drive, a defined distance must exist between the conical pulleys. Due to the press connection with a conical seat of the axially fixed conical disk whose axial position on the shaft is not well defined. The Zylinderabstützwand and thus the axially movable conical disk is pushed onto the shaft so that the defined distance is set in the basic position between the two conical disks. Subsequently, the Zylinderabstützwand is at least axially fixed if a possibly provided press fit is not sufficient for this.

following the invention will be described by way of example with reference to the attached Figures described in which:

1 shows a cross section along the axial direction through a conical disk arrangement according to the invention; and

2 an enlargement 1 in the region X, wherein the press-fit area between the conical disk and the shaft is shown.

1 shows a conical disk arrangement 10 according to the invention. Here are in 1 two embodiments relating to the attachment of a Zylinderabstützwand 20 on a wave 12 shown, which is shown one variant above the shaft axis A and the other variant is shown below the shaft axis A.

The arrangement contains next to the shaft 12 a cone pulley pair 30 with a first cone pulley 32 and a second cone pulley 34 , The conical disks 32 . 34 are on the wave 12 rotatably attached. The second cone pulley 34 is in the axial direction of the shaft 12 movable, the cone pulley 32 is in the axial direction of the shaft 12 established. Each of the conical disks 32 . 34 has an end face 33 . 35 on top of each other's cone pulley 34 . 32 of the cone pulley pair 30 is directed, with the end faces 33 . 35 a conical ring 36 define between them, in which a (not shown) wrapping means can be introduced. This means that the conical ring 36 acting as a space between the conical disks 34 . 32 is formed, widens in the radial direction to the outside. These are the conical disks 32 . 34 overall conical with a (imaginary) conical tip on the shaft axis A and a base surface which is one of the end faces of the conical disk, namely the front side facing away from the respective other conical disk.

The width b of this ring 36 between the conical disks 32 . 34 in the axial direction of the shaft 12 is by adjusting the adjustable, second cone pulley 34 changeable in the axial direction, so that the distance to the first conical disk 32 changes. By changing the distance between the first cone pulley 32 and the second cone pulley 34 Thus, the (not shown) wrapping means having a fixed length in the axial direction of the shaft 12 has to be forced to different diameters and thus the translation of a bevel gear change.

To prevent rotation of the adjustable second cone pulley 34 opposite the wave 12 are the inner peripheral surface of the cone pulley 34 and the opposite outer circumferential surface of the shaft 12 with, for example, a spline 14 Mistake. The spline 14 allows the cone pulley to be moved 34 in the axial direction, but holds it against rotation.

The adjustment mechanism for the sliding cone pulley 34 will be at the in 1 illustrated embodiment formed by a hydraulic mechanism. For adjusting the second cone pulley 34 in the axial direction is hydraulic fluid via a supply line 16 through corresponding holes in the shaft 12 is formed and to which a hydraulic supply can be connected, as needed in a chamber 50 supplied or removed, between the adjustable conical disk 34 and a cylinder support wall 20 holding the adjustable cone pulley 34 on the first cone pulley 32 engages opposite side, is formed. The chamber 50 is between the second cone pulley 34 and the cylinder support wall 20 for example, by an O-ring seal 51 or any other type of seal sealed. Corresponding sealing means may also (not shown) between the second conical disk 34 and the wave 12 and between the cylinder support wall 20 and the wave 12 be provided as needed. Straight between the cylinder support wall 20 and the wave 12 the requirement for a seal depends on the attachment of the cylinder support wall 20 on the wave 12 from what will be described later.

Will hydraulic fluid enter the chamber 50 fed and in the chamber 50 generates a corresponding pressure, shifts the second cone pulley 34 in the direction to the right in 1 ie on the first cone pulley 32 to. Depending on the pressure in the chamber 50 becomes a larger or smaller adjustment of the cone pulley 34 caused and the contact pressure of the cone pulley 34 on the (not shown) wrapping means and the belt on the first cone pulley 32 adjusted accordingly. By an opposite operation and adjustment of the adjustable conical disks on input and output side thus the belt can be forced to different diameters of the conical disks, both on the drive and the driven side, which are coordinated, and thus the ratio of the transmission can be adjusted. The belt is doing with the driving force F in the in 1 illustrated direction against the first cone pulley 32 pressed.

The cylinder support wall 20 is on the wave 12 fixed in rotation and fixed in the axial direction. These are in 1 two embodiments shown. At the first, in 1 shown above Embodiment, the cylinder support wall 20 on the wave 12 Pressed to size, with appropriate tolerance and dimensional accuracy, the cylinder support wall 20 with a circular cylindrical inner surface 22 and the wave 12 with an associated dimensionally stable, also circular cylindrical, outer surface 18 are provided. The two surfaces are paid attention to each other, so that the cylinder support wall 20 is held securely by the interference fit by means of press fit. In addition, as in the first alternative in 1 shown above, a weld 24 the position between the cylinder support wall 20 and the wave 12 to back up. The use of a weld 24 is further advantageous in that then no additional sealing of the hydraulic space 50 must be provided.

At the in 1 shown below alternative to attach the cylinder support wall 20 on the wave 12 is the cylinder support wall 20 also with a cylindrical inner surface 22 provided as a fitting surface, which in press fit with a corresponding outer surface 18 the wave 12 comes. In addition, the cylinder support wall becomes 20 in the axial direction through a split ring 26 held.

The cylinder support wall 20 was so far on the shaft during assembly 12 in the direction of the assembled cone pulley 32 pushed that the predetermined distance between the two conical disk end faces 33 . 35 is set in the basic position of the transmission. Subsequently, if necessary, an axial fixation of the cylinder support wall.

The attachment between the first cone pulley 32 and the wave 12 is the best 2 with the detail display of the detail X in 1 refer to.

To the contact force F, which is on the first cone pulley 32 acts to be able to record during operation, is between the first conical disk 32 and the wave 12 a conical interference fit 40 intended. The conical press fit 40 is through a portion of the inner peripheral surface of the cone pulley 32 (Conical disk press fit area 42 ) and an opposite region of the outer peripheral surface of the shaft 12 (Wave interference fit area 43 ) shaped. The cone pulley seating area 42 or the wave press seat area 43 are provided with mating surfaces which are coordinated with each other so that they form a cone angle α of, for example, 3 to 5 degrees to each other. The cone angle α is preferably selected such that self-locking arises in the press-fit area.

In the illustrated embodiment, this is the shaft 12 with a conically widening peripheral surface 44 provided, the associated conical disk press-fit surface 42 the first cone pulley 32 is also conical. The surfaces 42 . 43 are further selected so that the pressing force acting in the direction of the force F (see 1 ), greater than the maximum operating force or contact force of the belt can be selected during operation, so that the operating forces occurring from the first conical disk 32 can be included. When installed, the angles of the press-fitted surfaces are 42 . 43 at least the same.

In addition to the conical interference fit 40 is between the first cone pulley 32 and the wave 12 further a centering area 70 formed by a cylindrical (circular cylindrical) portion of the outer peripheral surface of the shaft 12 as centering seat 73 and a circular cylindrical portion of the inner peripheral surface of the first cone pulley 32 as centering area 72 is formed. By the respective cylindrical centering of the centering 72 and the centering seat 73 can be the first cone pulley 32 centered on the shaft 12 being held. To avoid edge pressure is on the inner peripheral surface of the first cone pulley 32 in the area of the centering area 72 an exemption 74 shaped, adjacent to the second cone pulley 34 facing end face 33 the first cone pulley 32 ,

As in 2 is further shown on the second cone pulley 34 facing end face 33 the first cone pulley 32 a plane surface area 60 adjacent to the inner circumference of the cone pulley 32 shaped. This plane surface area 60 serves a surface for pressing the cone pulley 32 on the wave 12 provide.

10

Cone pulley arrangement

12

wave

14

spline

16

supply

18

outer surface

20

Zylinderabstützwand

22

palm

24

Weld

26

divided ring

30

Conical pulley

32

first conical disk

33

face the first cone pulley

34

second conical disk

35

face the second cone pulley

36

conical ring

40

press fit

42

Conical disk press fit area

43

Shaft press fit area

44

peripheral surface

50

chamber

51

O-ring seal

60

planner area

70

centering

72

centering

73

centering

74

exemption

A

shaft axis

b

Width of the ring 36

F

driving force

α

cone angle

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

• - US 6506136 B2 [0004]
• EP 0777069 B1 [0004]

Claims (13)

Cone pulley arrangement ( 10 ) for a continuously variable cone pulley transmission, comprising a shaft ( 12 ), and a cone pulley pair ( 30 ) with a first conical disk ( 32 ) and one of the first cone pulley ( 32 ) in the axial direction of the shaft ( 12 ) opposite second conical disk ( 34 ), wherein the first cone pulley ( 32 ) on the shaft ( 12 ) is rotationally fixed and fixed in the axial direction and on the shaft ( 12 ) by a conical interference fit ( 40 ) is held. Cone pulley arrangement ( 10 ) according to claim 1, characterized in that the first conical disk ( 32 ) has an inner peripheral surface which faces an outer circumferential surface region of the shaft ( 12 ), wherein a conical disk press-fit area ( 42 ) of the inner peripheral surface and / or a wave press seat region ( 43 ) of the outer circumferential surface area in the axial direction of the shaft (FIG. 12 ) is conical. Cone pulley arrangement ( 10 ) according to claim 2, characterized in that the wave press seat area ( 43 ) is conical and the inner peripheral surface of the first cone pulley has a conical conical disk press-fit area ( 42 ) whose cone angle with respect to the shaft axis (A) is smaller than the cone angle of the wave press seat area. Cone pulley arrangement ( 10 ) according to claim 3, characterized in that the conical disk press-fit area ( 42 ) and the wave press seat area ( 43 ) include an angle (α) of 3 to 5 degrees. Cone pulley arrangement ( 10 ) according to claim 3 or 4, characterized in that the cone angles are equal after assembly. Cone pulley arrangement ( 10 ) according to one of the preceding claims, characterized in that the press fit ( 40 ) is self-locking. Cone pulley arrangement ( 10 ) according to one of claims 2 to 6, that the inner peripheral surface of the first conical disk ( 32 ) further comprises a cylindrical centering area ( 72 ) and the outer peripheral surface area of the shaft ( 12 ) a cylindrical centering seat ( 73 ) having. Cone pulley arrangement ( 10 ) according to claim 7, characterized in that the centering area ( 72 ) has a smaller diameter than the cone pulley press seat area (FIG. 42 ) having. Cone pulley arrangement ( 10 ) according to one of the preceding claims, characterized in that the first conical disk ( 32 ) on its front side ( 33 ) adjacent the inner peripheral surface a plane surface area ( 60 ), which is substantially perpendicular to the axial direction of the shaft ( 12 ). Cone pulley arrangement ( 10 ) according to one of the preceding claims, characterized in that the second conical disk ( 34 ) is adjustable in the axial direction, wherein an adjusting mechanism with an axially fixed Zylinderabstützwand ( 20 ) is provided and the cylinder support wall ( 20 ) on one of the first conical disk ( 32 ) facing away from the second cone pulley ( 34 ) is provided. Cone pulley arrangement ( 10 ) according to claim 9, characterized in that the cylinder support wall ( 20 ) on the shaft ( 12 ) by a press fit ( 18 . 22 ) is held between cylindrical surfaces. Cone pulley arrangement ( 10 ) according to claim 9, characterized in that the cylinder support wall ( 20 ) by a weld ( 24 ) and / or a split retaining ring ( 26 ) in the axial direction on the shaft ( 12 ). Cone-pulley CVT transmission with a conical disk arrangement ( 10 ) according to any one of the preceding claims.