DE102009023597A1 - Freewheel bearing arrangement for crank continuously variable transmission gear in vehicle, has two roller bearings radially mounting outer ring with respect to inner ring at position within outer circumferential surface of inner ring - Google Patents

Abstract

The arrangement (10) has a clamping body (16) arranged between an inner ring (14) and an outer ring (12). Two roller bearings are designed as angular ball bearings (20) and radially mount the outer ring with respect to the inner ring in a position within outer circumferential surface (15) of the inner ring. Inner and outer rings of the bearings are connected with the inner ring and the outer ring, respectively. The bearings are radially arranged inwards with respect to the outer contour of the inner ring and raceway provided by an inner body of a freewheel.

Description

The The invention relates to a freewheel bearing assembly, in particular for a crank CVT transmission and a crank CVT transmission with such a freewheel arrangement, with particular reference to the Side of the output shaft of the transmission stored the freewheels can be.

A crank-CVT transmission is for example from the DE 102 43 533 A1 known. In this gearbox, an adjustable eccentric drive arrangement with eccentric components is provided on an input shaft which can be driven by a motor and which forms a driving shaft with respect to the gearbox, which is connected via connecting rod-like connecting elements to a driven shaft which, in relation to the gearbox, has a starting gear. or output shaft forms. The driven shaft is driven by the transmission of the stroke of the connecting elements by means of freewheel devices on the shaft, which are provided between the connecting elements and this shaft.

The Crank CVT transmission usually contains a driving Crankshaft and an output shaft, which are aligned parallel to each other are and are rotatably mounted in a housing respectively. From an internal combustion engine, for example, will torque in the Crankshaft introduced and through the crank-CVT transmission below Consideration of a suitable translation transmitted to the output shaft. There can be the torque for example, tapped for driving wheels of a vehicle become.

to Setting the desired translation are on the crankshaft in series in the axial direction of the crankshaft arranged eccentric provided on which connecting rod-like fasteners via Rolling, for example, needle bearings are stored. A corresponding number of on the output shaft in the axial direction one behind the other arranged freewheel units is provided, where the with connected to the eccentric connecting rod-like fasteners on outer rings of the freewheel units on connecting rods, the on a correspondingly thickened area of the outer ring are provided are stored. The freewheel units are through a provided on the output shaft or associated polygonal Profile as well as rolling elements or sprags, between the polygonal profile and an inner circumferential surface of the outer ring are formed. Thus, by the profiled inner raceway of the polygonal profile in conjunction with, for example, rollers as clamping bodies a clamping action achieved, at least in a relative direction of rotation between the outer ring and the output shaft, or the polygon-like Profile, the roles of a rotation of these components relative to each other Block so that the output shaft and the outer ring be twisted together. In the other direction of relative rotation no blocking effect is generated by clamping body. alternative So-called reversible freewheels are provided which in addition to a neutral position in which they have a relative rotation of Output shaft of the outer ring or a connecting ring allow for the connecting rod-like connecting element, two blocking positions in which the two components in a first or a block second relative direction of rotation and thus in the first and second direction of rotation are twisted together. This allows the Direction of rotation of the output shaft can be changed so that, for example a reverse gear can be realized.

The translation the transmission is equipped with an adjustment for the Exzentereinheiten set. By the adjustment is the eccentricity of the Exzentereinheiten opposite the axis of rotation of the drive shaft changed, causing the Hub of the connecting rod-like connecting elements, which transmit to the output shaft will, is also changed and thus the translation is set between the drive shaft and the output shaft.

at a conventional bearing assembly for the clutches are along the axial direction of the output shaft more freewheel units arranged, each freewheel unit an outer ring having, as a connecting ring to the connecting rod-like connecting element serves. Each between two adjacent freewheels is a radial bearing between the output shaft and the outer ring provided so that the storage is substantially at the same radial height and in the axial direction adjacent to the freewheels. The axial length of a freewheel unit is thus through the freewheel itself, in particular the rolling or clamping body width, and the bearing width determined. The bearings are in the radial direction lying outside with respect to the profiled circumference the inner shaft or at a radial height with it.

From that Based on the object of the invention, an axially space-saving Bearing arrangement for the freewheels, in particular for use in a crank CVT transmission.

These Task is with a Freilauflageranordnung with the features of claim 1. Preferred embodiments are indicated in the dependent claims.

The invention is based on the idea, the rolling bearing, which provide a bearing between the outer ring and the inner ring of the freewheel, radially inwardly lying with respect to the Au ßenkontur the inner ring, ie the through the inner body of the free run track, to arrange. As a result, the rolling bearings can be arranged in the axial direction overlapping with the clamping or rolling elements of the freewheel, so that little or no additional axial space, in addition to the contact width of the clamping or rolling elements, is needed.

Consequently sees the freewheel bearing assembly an inner shaft with an outer profile, a the inner shaft encompassing outer ring and between the inner shaft and the outer ring arranged clamping body before, wherein for storage between the inner ring and the outer ring two rolling bearings are provided which are radial at a position are arranged within the outer profile of the inner ring.

Of the Bearing outer ring of the rolling bearing is preferably with the outer ring of the freewheel and the bearing inner ring of the rolling bearing connected to the inner ring of the freewheel. This causes a widening of the outer ring or a compression of the inner ring during the clamping process the freewheel to a relief of the bearing, without the Zentriergüte is impaired in the relaxed state. By the Clamping the freewheel arises namely at the contact points to the sprags / rollers a radially directed force, which leads to the aforementioned expansion or compression.

To In a preferred embodiment, the bearings are angular contact ball bearings educated. This allows the forces from the outer ring be transferred well in the inner ring or in the opposite direction and build the bearings compact.

To a preferred embodiment are in the axial direction on the outer ring or outer star on the axial end sides thin disc-shaped areas are provided in the radial direction inwards in each case to the roller bearing, particularly advantageously the outer ring of the rolling bearing, extend and there the outer ring on the rolling bearing to store. As a result, the axial space can be further minimized because the width of the freewheel only by the contact width the clamp body or roller body, if necessary a cage for the clamp body as well the two thin disc-shaped areas to Connection of the bearing to the outer ring is determined.

Preferably the two thin disks are designed in such a way that they in the assembled state of the freewheel bearing assembly a exert axial force on the outer rings of the bearing, so that a Belleville effect is achieved. This allows the assembly be simplified by eliminating a setting of the camp because of the thin disc-shaped areas the contact pressure is guaranteed. Also in the expanded Condition remains ensured that the rolling elements or clamping body in rolling contact with external and inner ring remain, so no wear due from slippage or reverse acceleration occurs. All in all fall the reversing accelerations on the elements of the freewheel bearing assembly, in particular the rolling elements and any Cage, lower than in the previously known bearing assemblies.

To In a preferred embodiment, the thin ones are disc-like areas with respect to their radial rigidity optimized by, for example, beads, recesses, wells and / or Breakthroughs, or any combination thereof, provided are. Thus, a radial elastic deformation (preload) be achieved in the assembled, unloaded condition. Thereby can the outer ring during the tensioning of the Freewheel experience a widening, without causing a relative movement between the radially extending thin disc-shaped Areas and the bearing outer ring comes.

alternative this can be a defined sliding between the radially extending thin washers and the bearing outer ring provided become.

To a preferred embodiment, the bearings are with a Seal provided. This, in particular in connection with an oil or fat-tight design of the other contact points, is a simple seal of the freewheel against lubricant leakage or dirt entry possible.

To a preferred embodiment is one of the thin Washers integral, in particular in one piece, with the outer ring educated. The second disc (cover) can with the outer ring for example, screwed or welded and be formed separately from it. So can the individual Freewheel prefabricated and during gearbox assembly stuck on a central shaft, pressed, welded, screwed or shrunk or as zusammengespannt individual segments form the output shaft by z. B. at their faces are provided with a Hirth toothing.

Consequently An arrangement can be created in which the bearings on the one hand are constantly slightly biased radially and axially and Thus, a balance of elasticity can be achieved and Manufacturing tolerances balanced during assembly can be.

following the invention will be described by way of example with reference to the attached Figure described. The figure shows a cross-section of a freewheel bearing arrangement according to the invention.

In the figure, in a section along the axial direction is a Freilauflageranordnung 10 shown, which can be placed on a (not shown) output shaft of a crank-CVT transmission, for example, pressed, welded or shrunk. Alternatively, a plurality of the freewheel bearing arrangements shown in the figure can be clamped together and form the output shaft as individual segments.

The free warehouse arrangement 10 contains an outer ring 12 , an inner ring 14 and roll-like clamp body 16 , The clamp body 16 are between the outer ring 12 and the inner ring 14 introduced, wherein the outer ring 12 and the inner ring 14 a corresponding profiled inner peripheral surface 13 or outer peripheral surface 15 have, so that the clamping body 16 for blocking the outer ring 12 and the inner ring 14 provide each other or can release them, so that the outer ring 12 and the inner ring 14 in at least one direction of rotation when blocking the relative rotation to each other can only be rotated together. For example, one of the profiles is a polygonal profile, the other of the profiles is circular.

The clamp body 16 are in a cage 17 fitted, with the cage 17 for example, at the same time for a springing of the clamping body 16 to the inner ring 14 , in particular the profiled outer surface 15 of the inner ring 14 and / or a springing of the clamping bodies 16 can provide in the circumferential direction. The profiled outer surface 15 of the inner ring 14 is designed, for example, as a polygonal profile.

On the outer ring 12 are connecting rod eyes 18 formed on which connecting rod-like connecting elements can be articulated, with which a connection to the drive side of a crank-CVT transmission can be made, for example.

The inner ring 14 indicates its profiled outer surface 15 the required for the transmission of torque contact width of the clamping elements 16 on. In a radially inner area is the inner ring 14 narrower in the axial direction, so that at the two end surfaces in the axial direction of the inner ring 14 a step is formed. In this stage, at each of the axial end portions of a rolling bearing, in particular an angular contact ball bearing 20 used. In each case, the inner ring of the angular contact ball bearing 20 with the inner ring 14 in connection.

The outer ring 12 has at its one end in the axial direction a radially inwardly directed, thin disk-shaped surface or thin disk-shaped region 22 on, which is integral with the inner ring 12 is trained. The disc-shaped region extends radially inwardly to the outer ring of the associated rolling bearing 20 (right bearing in the figure). In the axial direction, thus, the outer ring extends 12 , in particular in the region of the disk-shaped region 22 , over the inner ring 14 out and surrounds this outside. At the other axial end of the outer ring 12 is a disc formed separately from the outer ring as the second thin disc-shaped region 24 with the outer ring 12 firmly connected, for example by welding or screws. This area 24 also extends in the radial direction to the outer ring of the corresponding bearing 20 (in this case, the left bearing in the figure). The disc-shaped area 24 is arranged so that it is the inner ring 14 on the thin area 22 opposite side in the axial direction includes or covers.

The outer ring 12 is thus about the thin disk-shaped areas 22 . 24 on the outer ring of the bearings 20 stored.

Preferably (not shown in the figure) are the thin disk-shaped areas 22 . 24 designed such that they are in the assembled state of the freewheel bearing assembly 10 an axial force on the bearing outer rings of the bearings 20 exercise. In addition, the thin disk-shaped regions preferably have corrugations and / or breaks which influence the radial stiffness, so that a radial elastic deformation (pretension) is achieved in the assembled unloaded state. Thus, the outer ring 12 during the tensioning operation of the freewheel experience a widening, without causing a relative movement between the radially extending disc-shaped areas 22 . 24 and the bearing outer ring of the bearing 20 comes.

10

Freewheel bearing arrangement

12

outer ring

13

Inner circumferential surface

14

inner ring

15

Outer circumferential surface

16

clamping bodies

17

Cage

18

connecting rod

20

Angular contact ball bearings

22

thinner disk-shaped area

24

thinner disk-shaped area

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 10243533 A1 [0002]

Claims (8)

Freewheel bearing arrangement ( 10 ), in particular for freewheels of a crank-CVT transmission, comprising an inner shaft ( 14 ) with external profile ( 15 ), one the inner shaft ( 14 ) encompassing outer ring ( 12 ) and between the inner shaft ( 14 ) and the outer ring ( 12 ) arranged clamping body ( 16 ), whereby two rolling bearings ( 20 ) are provided and at a position radially within the outer profile ( 15 ) of the inner ring ( 14 ) the outer ring ( 12 ) with respect to the inner ring ( 14 ) to store. Freewheel bearing arrangement ( 10 ) according to claim 1, wherein the bearing inner ring of the rolling bearing ( 20 ) with the inner ring ( 14 ) of the freewheel and the bearing outer ring of the rolling bearing ( 20 ) with the outer ring ( 12 ) of the freewheel is connected. Freewheel bearing arrangement ( 10 ) according to one of the preceding claims, characterized in that the rolling bearing ( 20 ) is an angular contact ball bearing. Freewheel bearing arrangement ( 10 ) according to one of the preceding claims, characterized in that the outer ring ( 12 ) at its end regions in the axial direction each with a thin disk-shaped region ( 22 . 24 ) is provided, which extends in the radial direction up to each one rolling bearing ( 20 ). Freewheel bearing arrangement ( 10 ) according to claim 4, characterized in that the disc-shaped areas ( 22 . 24 ) are designed such that they plate spring-like an axial force on the rolling bearing ( 20 ) exercise. Freewheel bearing arrangement ( 10 ) according to claim 4 or 5, characterized in that one of the disc-shaped areas ( 22 ) integral with the outer ring ( 12 ) is formed and the other of the disc-shaped areas ( 24 ) as a separate component on the outer ring ( 12 ), preferably welded or screwed is. Freewheel bearing arrangement ( 10 ) according to one of claims 4 to 6, characterized in that the disk-shaped region ( 22 . 24 ) is provided with recesses, in particular recesses and / or openings. Crank CVT transmission with a freewheel bearing assembly ( 10 ) according to any one of the preceding claims.