DE102009005116A1 - Bearing arrangement for cam roller of tensioning device used for tensioning e.g. belt of internal combustion engine of vehicle, has roller pivoted via rotational axis with respect to bearing axis of pin and fixed in adjusted angle position - Google Patents

Abstract

The arrangement (10) has a cam roller (12) rotatably supported around a rotational axis on a bearing pin (26) by an anti-friction bearing (40). The cam roller is narrowly pivoted through the rotational axis with respect to a bearing axis of the bearing pin and fixed in an adjusted angle position. The anti-friction bearing is clamped for defining the adjusted angle position. The bearing pin has a collar (32) including a clamping surface (34). The bearing pin is arranged at a bearing position (22) at which another clamping surface is formed.

Description

Field of the invention

The The invention relates to a bearing arrangement for a roller in a traction drive, especially for a roller of a tensioning device in a traction drive, with a journal on which the roller by at least one rolling bearing is mounted rotatably about a rotation axis. Furthermore, the Invention, a tensioning device for traction means, with such Bearing assembly.

traction means, such as single or multiple wedge drive belts, for example used in internal combustion engines to aggregates, such as generators, Air conditioning compressors, power steering pumps, water pumps and the like, For example, with the crankshaft of the internal combustion engine friction to drive or functional units of the internal combustion engine, like crankshaft and camshaft to couple with each other. With timing belt slip should not exceed 1 to 2% on the one hand, on the other hand, acting on the pulleys and rollers personnel not unnecessarily assume a level which provides increased power dissipation in the drive, For example, the crankshaft, the result. Also, such Bearing arrangements for pretensioning traction means in industrial Applications, for example in machine tools, textile machines and similar, used.

Around to prevent vibration of the traction device and to ensure a proper course to ensure the traction means the traction means is biased by means of so-called tensioning devices. ever after the traction means is the tensioning device with this a tensioning rail or equipped with a roller. The Clamping device or the roller has several tasks, It should bias the traction means, dampen Zugmittelschwingungen and lead the traction device and direct. The term roller are used in the context of the invention also leadership roles, Tension rollers, pulleys, pinions and comparable rotatably mounted clamping elements Understood. Pulleys are often used to increase the Looping angles, for example with generators with a small pulley diameter, and for brevity of the oscillatory Used beltrums. Modern clamping devices are maintenance-free, self-tensioning and have one so long life, that normally a replacement during the lifetime the internal combustion engine is not necessary. The attachment The clamping device is usually done via a Central screw or a flange screw connection.

In 8th is a sectional side view of a bearing assembly 200 in the prior art for a roller 202 shown. The roller 202 comes in a clamping device 204 for a drive belt of ancillaries of an internal combustion engine used.

The bearing arrangement 200 is on a swivel arm 206 the clamping device 204 provided, which on a pin 208 is rotatably mounted and with the help of a torsion spring 210 about the pivot axis S of the pin 208 the running role 202 biased in a predetermined direction against the belt, not shown. Ideally, the axis of rotation of the roller should be perpendicular to a contact surface A, with which the clamping device 204 comes after installation on a corresponding mating surface on the vehicle or on the internal combustion engine to the plant.

Around proper management, clamping or To ensure deflection of the traction device, be to the positioning accuracy the roller accordingly high demands. As a result, the different components of the clamping device accordingly be made, in particular, the positional accuracy of the Rotation axis of the roller relative to the traction means of great importance is. Is the roller on a movable arm or lever stored, must above it In addition, the pivot axis of the pivot arm and the contact surface of the entire clamping device in the positioning accuracy of the roller considered become. Accordingly, to the components of the bearing assembly of Roller very high demands, which are very high Expenditure in the production of the individual components result. The accuracy is in most cases by a precise cutting Processing of the relevant individual parts before the complete assembly of the Clamping device or else by a correspondingly precise post-processing reached the clamping device after the complete assembly. In appropriate Way must also the counter surface at the installation site, for example on the internal combustion engine, correspondingly precise be made.

At the in 8th shown clamping device 204 For example, the accuracy is ensured by the angle deviation between the axis of rotation and the contact surface A may be only 0.2 °.

Based on the above-mentioned prior art, it is an object of the invention to provide a bearing assembly for a roller in a traction mechanism or a tensioning device for traction means to produce or in which the bearing assembly for the roller compared with the prior art with less effort is, at the same time ever but offers a comparable positional accuracy.

Disclosure of the invention

According to the invention this Task by a bearing assembly having the features of claim 1 and in particular solved by that the roller with its axis of rotation opposite to the Bearing axis of the journal limited pivoting and in the set Angle position can be fixed. Furthermore, the object is achieved by a clamping device for traction means solved, with a bearing assembly according to the invention is provided.

at the bearing assembly according to the invention Although the roller is supported by at least one roller bearing, it allows unlike in the prior art so far possible, an adjustment of the roller while or after assembly of the bearing assembly. For this purpose is after the complete assembly the position of the axis of rotation of the bearing across from the axis of the bearing axis of the journal or against the contact surface measured. Subsequently is the roller opposite pivoted the bearing axis of the journal and in the newly set Secured angular position. This makes it possible in particular, the tread of Adjust the pulley so that the pulley after assembly of the Bearing arrangement or the clamping device on the unit relative to the Traction means occupies an optimal position in which the angular offset for a proper management of the Traction means is sufficiently low, so that the roller optimal Position can take to the traction means. In the optimal position extends the roller with its axis of rotation at a right angle based on the longitudinal extent of the traction device. However, if necessary, the roller can also be light inclined to the longitudinal extent of the Traction run. This is particularly advantageous if the roller tends to tumble, for example when using single row Ball bearings as rolling bearings, and the wrap angle small and / or the acting load the roller is comparatively low. Due to the subsequent adjustability have to the various components of the bearing assembly no longer with be made so high accuracy, as usual, so that the effort in manufacturing compared with the state of the art Technology is significantly lower. At the same time, despite the simplified Manufacturing a precise Positioning of the roller against the traction means possible, so that the traction means is loaded evenly.

Further Advantages of the invention will become apparent from the following description, the drawing and the dependent claims.

So is in a particularly preferred embodiment of the bearing assembly according to the invention suggested that the rolling bearing the roller for clamping the set angular position can be clamped is. Because rolling bearings manufactured as machine elements from the house with comparatively high precision be already results in a high accuracy in terms of Bearings of the roller on the rolling bearing. The rolling bearing itself, in this embodiment across from the journal, on which it is mounted, pivoted and fixed by clamping can, is offered by design investment surfaces on which the rolling bearing good for fixing the angular position can be clamped.

at a particularly preferred embodiment of this bearing arrangement according to the invention clampable rolling bearings is for adjusting and fixing the angular position of the roller on Bearing journal a collar with a first clamping surface and at the bearing point, at the bearing pin is attached, a second clamping surface provided, wherein the distance between the clamping surfaces can be changed. The inner ring of the rolling bearing the roller is arranged between the two clamping surfaces. By the two clamping surfaces slight can be moved apart, the rolling bearing and thus the angular position the axis of rotation of the roller relative to the bearing axis of the journal be pivoted. After adjusting the angular position, the two clamping surfaces only to be moved towards each other again until the rolling bearing is securely held or clamped in the set angular position.

Around a secure hold of the rolling bearing to ensure in the clamped state have the two clamping surfaces concave or convex surfaces on, which at the same time also the pivoting range for the roller establish.

at this development, the inner ring of the rolling bearing in a first preferred execution on each of its two faces a circumferential crowned or concave contact surface on, with which the inner ring of the rolling bearing between the two concave or convex clamping surfaces held and clamped between them. In an alternative execution is in each open end of the inner ring of the bearing introduced a spacer, which at their respective one of the clamping surfaces facing end face has a circumferential spherical or concave contact surface, with the spacer sleeve at the respective clamping surface is applied. Especially the latter solution offers the advantage that for the storage of the roller conventional rolling bearings can be used while provided depending on the purpose of different spacers can be which gives the flexibility further increased in the formation of the bearing assembly.

at an alternative embodiment the bearing assembly according to the invention is the rolling bearing with an inner ring or in addition provided to the inner ring with an inner sleeve, in or in the a bearing portion of the journal is inserted. To adjust the Angular position is depending on the embodiment the inner ring or the inner sleeve adjusted relative to the bearing section and the inner ring or the inner bush in the set angular position of roller bearing fixed or clamped.

Of the Inner ring or the inner sleeve are designed so that by a relative adjustment of the inner ring or the inner bush the Angular position of the rolling bearing at least opposite the bearing, possibly even adjusted to the bearing axis can be.

So is in a particularly preferred embodiment of this embodiment the inner ring or the inner bushing of the rolling bearing with a rotationally symmetrical to the axis of rotation of the rolling bearing extending, provided substantially cylindrical peripheral surface. The at a clamping surface of Bearing to the plant coming end face of the inner ring or the Inner bush runs inclined at a predetermined angle to a perpendicular to the Rotation axis of the rolling bearing plane running, so has a defined plan impact. The angle or pitch is chosen so that production-related Angular position deviations in the course of the clamping surface relative to the bearing axis of the journal can be compensated. Ideally, the clamping surface lie in a plane perpendicular to the bearing axis. Depending on the allowed Tolerance, however, is due to manufacturing tolerable deviations from several tenths of a degree. In such a case, the Front side of the inner ring or the inner sleeve, for example so be made that the front side a flat in one Range of 0.2 to 1.0 °. Now, the inner ring or the inner sleeve is pushed onto the bearing section and with the beveled Face against the clamping surface brought into abutment, can now by relative twisting the face opposite the clamping surface the tolerance-related course of the clamping surface compensated in a simple manner and the rolling bearing be secured in the set neutral angular position. Experience has shown the plan impact of the end face of the inner ring or the inner sleeve in a range of 0.1 to 2.0 °, preferably in a range of 0.2 to 1.0 °, tolerance-related positional deviations to be able to compensate well.

In particular, according to the invention proposed a deviation of the axis of the bearing axis of the journal or a deviation of the course of the plant surface over a measure predetermined reference point, for example, compared to one Ideal course of the rotation axis of the rolling bearing. Then it will be off several inner rings or inner bushings with flats selected the flatness corresponds to the measured deviation. After assembly of the rolling bearing then only has more of the inner ring or the inner sleeve relative to the clamping surface so far be adjusted until the flattening the position deviation of the bearing axis or the contact surface at least approximately Completely balances. In this position then the inner ring or the inner sleeve secured.

To the Determining the inner ring or the inner bush with a face flap against the Depository are proposed different solutions.

So is in a particularly preferred variant of this development proposed to use a bearing bush as a bearing section, which pushed onto serving as a bearing pin fixing screw is. The inner ring or, if provided, the inner bush or the bushing is designed as a wobble bush, in the a first conical peripheral surface is formed, which at an angle to the axis of symmetry of respective socket inclined. In contrast, the respective counterpart, so in an inner ring or an inner sleeve with inclined extending first peripheral surface the Bearing bush, or a bearing bush with inclined running first peripheral surface the inner ring or the inner bush, with a second conically extending peripheral surface provided coaxially with the axis of symmetry of the counterpart. The Both peripheral surfaces are in this case designed so that they at least partially full surface with each other come in contact can. For relative adjustment must now only the two peripheral surfaces be moved against each other, whereby the axis of rotation of the roller across from the longitudinal axis of the journal is adjusted. To set the so set Angular position must subsequently only the fastening screw are tightened, their head like this it is dimensioned that he when tightening the fastening screw the end face of the bearing bush comes to rest and the bearing bush braced in the inner ring or in the inner sleeve.

In an alternative variant of the development with an inner ring or inner bushing with a flat face, the inner peripheral surface of the inner ring and the inner sleeve is provided at the opening end, which faces away from the inclined end face, a hemispherical shell-shaped contact surface. As a bearing pin is used in this variant, a fastening screw with hemispherical head, which when tightening the mounting screw comes to rest on the hemispherical shell-shaped contact surface of the inner circumferential surface and clamped the inner ring or the inner sleeve in the set position relative to the bearing. Due to the spherical shape of both the contact surface and the head of the fastening screw of the inner ring or the inner sleeve can be rotated relative to the mounting screw and securely clamped in the set angular position. The hemispherical head can be achieved by appropriate design of the screw head. Alternatively, it is also possible to postpone an attachment with a bore on a conventional screw with a cylindrical screw head, wherein the attachment is provided with the hemispherical bearing surface.

In a third variant of the development with inner ring or with Inner bushing with flats is suggested, the inner peripheral surface of the Inner ring or the inner sleeve to be designed so that the inner peripheral surface starting from its opening end, which faces away from the inclined end face, tapers conically. When Journal serves in this third variant, a fastening screw with conical Head, which when tightening the mounting screw on the conically tapered inner peripheral surface to Plant comes and so the inner ring or the inner bush in the set Position clamped relative to the bearing. Again, it is possible, alternatively an attachment with hole on a conventional screw with a cylindrical screw head defer, the attachment provided with the conical contact surface is.

at In all three variants, when using an inner bush, the inner bushing aslant slotted, so that when tightening the mounting screw the inner bush is widened and jammed in the inner ring of the bearing. Alternatively, the inner sleeve and non-positively to form a Press fit be held in the inner ring. In this case, at the variant with bearing bush, the bearing bush additionally be slit obliquely, to achieve a particularly good clamping of the two jacks.

According to one another embodiment of the Inventive bearing arrangement it is proposed the rolling bearing with its inner ring or its inner sleeve slotted on a slant executed Postpone bushing, which in turn on one as a journal serving mounting screw is pushed, the bearing bush between a trained on the bearing point first clamping surface and a provided on the mounting screw second clamping surface arranged is. By reducing the axial distance between the clamping surfaces it then possible the oblique Slotted executed Bearing bush is radially expand such that the bearing bush the inner ring or the inner bush in the set angular position secures and fixes.

at a particularly preferred embodiment of this embodiment is the inner lateral surface the inner ring or the inner sleeve formed as a spherical shell is while the with the inner surface in touch coming outer surface of the Bearing bush is designed as a ball. The inner ring or inner bush as well as the bearing bushing form a kind of ball joint, which pivoting of the inner ring or the inner bush relative to the bearing bush permits, so that the angular position of the axis of rotation of the roller relative to the longitudinal axis of the journal can be adjusted. Subsequently, only the axial distance has to be increased between the clamping surfaces be reduced, so that the slotted bearing bush expanded so far is that the inner ring of the rolling bearing or into the inner ring of the rolling bearing inserted inner bush, in this preferably non-positively, for example by a press fit, securely held, in the set angular position is secured.

According to one Another embodiment is the bearing pin formed or attached to the bearing and with a through hole for a Clamping element provided, which for clamping the inner ring of Wälzla gers formed against a concentric with the bearing axis at the bearing pin to the longitudinal axis of the journal clamping surface protrudes through the through hole. Between the clamping surface and the facing side of the inner ring is also a spacer element intended. The spacer element is provided with a contact surface, the complementary to the clamping surface as a convex or concave surface is formed, so that the inner ring of the rolling bearing together with the Distance element opposite the clamping surface the bearing point for adjusting the angular position and pivotable with help of the clamping element for setting the set angular position against the clamping surface can be clamped. The spacer element can be used as an independent component be formed so that a conventional rolling bearing used can. Alternatively, however, the spacer can also be made in one piece be formed integrally formed a corresponding inner ring. Further it is advantageous if the spacer element is protected against corrosion, for example, by using an appropriate material or by coating.

As a clamping element is preferably used in this development a screw, which with its screw head on the end face remote from the spacer element of the inner ring of the rolling bearing is applied while the screw is secured by means of a bolted to the bearing pin rear of the bearing point nut. In this case, a clamping surface is provided at the rear of the bearing on which the nut is supported by a contact surface complementary to the clamping surface such that the screw is pivotable with its longitudinal axis relative to the longitudinal axis of the journal pivot and in the set angular position. Again, the contact surface may be convex or concave, while the clamping surface is formed complementary to the contact surface, ie concave or convex. The contact surface of the nut is preferably formed on a disposed between the nut and the clamping surface of the bearing, pushed onto the screw spacer. Alternatively, however, it is also possible to use a nut which is already provided on one of its end faces with a correspondingly rounded contact surface.

at an alternative development of the embodiment is the clamping element Although also a secured with a nut screw. at This development is the nut with which secured the screw is, however, at the end facing away from the spacer element of the Inner ring of the rolling bearing arranged, while the screw head on the rolling bearing facing away back the bearing is positioned. Again, at the back the bearing a clamping surface formed, on which the screw rests with its screw head. The screw head preferably has a design complementary to the clamping surface contact surface with convex or concave shape. The screw head is supported at the complementary to the contact surface trained clamping surface the bearing point from such that the screw with its longitudinal axis across from the longitudinal axis of the journal is pivotable and to set the set angular position can be clamped.

at Both previously described training is an essential Advantage in that standard components, such as standard screws, standard nuts and also when using a separate spacer element conventional roller bearing can be used. It also protects the spacer the rolling bearing from external influences and acts as a protective element that protects the bearing from heat by radiation and convection protects and absorbed heat from the rolling bearing dissipates, which is particularly immediate in the arrangement of the bearing assembly according to the invention is particularly advantageous on an internal combustion engine.

The Inventive bearing arrangement can directly on a carrier attached or provided on the pivot arm of a clamping device be.

When roller bearing are preferably ball bearings in the bearing arrangements described above used to the speeds and lowest possible power losses to meet. The rolling bearings used are preferred as Outside sealed and lubricated with a lifelong lubricant filling.

According to one In another aspect, the invention relates to a tensioning device for traction means, with a bearing assembly according to the invention Is provided.

embodiment

Short description of the drawing

following the invention with reference to three embodiments with reference on the attached Drawing closer explained. It shows:

1 a sectional side view of a tensioning device for a traction mechanism drive with a first embodiment of a bearing arrangement according to the invention for the roller of the clamping device;

2 a sectional side view of a modification of in 1 shown bearing assembly according to the invention for the roller;

3 an enlarged view of a sectional view, in which only a second embodiment of a bearing assembly according to the invention is shown;

4 a sectional side view of a third embodiment of a bearing assembly according to the invention, which in the in 1 shown clamping device can be used;

5 a sectional side view of a first modification of the in 4 shown third embodiment;

6 a sectional side view of a second modification of the in 4 shown third embodiment of a bearing assembly according to the invention;

7 a sectional side view of a third modification of the in 4 shown third embodiment of a bearing assembly according to the invention; such as

8th a sectional side view of a tensioning device for a traction drive according to the prior art.

In 1 is a sectional side view a first embodiment of a bearing arrangement according to the invention 10 for a roller 12 shown in a tensioning device 14 is used for a drive belt of an aggregate of an internal combustion engine.

The bearing arrangement 10 is on a swivel arm 16 the clamping device 14 provided, which on a pin 18 is rotatably mounted and with the help of a torsion spring 20 about the pivot axis S of the pin 18 the roller 12 biased in a predetermined direction against the belt, not shown. The pivot axis S is ideally perpendicular to a contact surface A, with the clamping device 14 comes after installation on a corresponding mating surface on the vehicle or on the internal combustion engine to the plant.

At the free end of the swivel arm 16 is a depository 22 for the roller 12 educated. At the depository 22 is an at least approximately parallel to the pivot axis S of the axis 18 running thread 24 formed, in which a journal 26 is screwed. At the wheel 12 facing side of the bearing 22 is about the thread 24 around a clamping surface 28 formed, which designed in the form of a spherical segment-shaped recess and concentric with the thread 24 is arranged.

The journal 26 has an external thread at one end 30 with which the trunnion 26 in the thread 24 is screwed. At the other end is on the journal 26 A bunch 32 molded, which at its the depository 22 facing side with a second clamping surface 34 is provided. The second clamping surface 34 is designed in the form of a spherical segment-shaped recess and concentric with the journal 26 formed, wherein the second clamping surface 34 at least approximately the same dimensions as the first clamping surface 28 , At the front of the covenant 32 is a hexagon socket 36 provided for a hexagon socket wrench.

The roller 12 has a receiving bore 38 in which a ball bearing 40 is used. The ball bearing 40 has a conventional manner in the receiving bore 38 inserted outer ring 42 as well as evenly over the inner circumference of the outer ring 42 distributed bullets 44 on. The inner ring 46 of the ball bearing 40 is designed differently from conventional ball bearings and has a contact surface on each of its two end faces 48 respectively. 50 on, which is in the form of a spherical segment and concentric with the inner bore 52 of the inner ring 46 runs. The contact surfaces 48 and 50 are identical and correspond in size to the dimensions of the two clamping surfaces 28 and 34 , The open end of the roller 12 is through a detachable cap 54 locked.

As 1 shows is the roller 12 with the inner ring 46 her ball bearing 40 on the journal 26 deferred, with the outer diameter of the journal 26 is less than the inner diameter of the inner ring 46 , The inner ring 46 is with its two contact surfaces 48 and 50 between the two clamping surfaces 28 and 34 clamped when the journal 26 firmly in the thread 24 is screwed.

Will now the clamping device 14 preassembled, it may despite accurate production of the various components to a deviation between the course of the pivot axis S of the pivot arm 16 or the contact surface A of the pivoting device 14 and the roller 12 or the bearing axis of the Kugella gers 40 come, so that of the roller 12 Belt in service is not properly removed from the caster 12 is supported.

With the bearing arrangement according to the invention 10 It is now possible during assembly of the roller 12 or even after the installation of the clamping device 14 in the final installation position the course of the axis of rotation of the roller 12 relative to the course of the axis of the journal 26 and thus also with respect to the course of the pivot axis S of the swivel arm 16 or the course of the contact surface A of the clamping device 14 to adjust. For this purpose, the bearing journal must first 26 slightly out of the thread 24 be screwed. Then it is possible to use the ball bearing 40 over the contact surface 48 and 50 opposite the two clamping surfaces 28 and 34 so to pivot until the desired course of the axis of rotation of the roller 12 opposite the journal 26 is set. Subsequently, the bearing pin 26 tightened again, with the ball bearing 40 in the newly set position between the two clamping surfaces 28 and 34 at the contact surfaces 48 and 50 is clamped.

2 shows a modification of the in 1 shown bearing assembly 10 , In this modification, instead of in 1 shown inner ring 46 a conventional inner ring 56 used. In each open end of the inner ring 56 is a spacer 58 and 60 introduced in the axial direction in the inner ring 56 protrudes and supports him so radially. Furthermore, each spacer sleeve protrudes 58 and 60 in the radial direction over the inner ring 56 out, leaving the inner ring 56 is supported in the axial direction. The front sides of the two spacer bushes 58 and 60 are also with spherical segment-shaped contact surfaces 62 and 64 equipped, which are identical to each other and in their dimensions the dimensions of the two clamping surfaces 28 and 34 correspond.

Even with this modification, only the journal must 26 with its external thread 30 out of the thread 24 screwed, the roller 12 aligned and then the journal 26 be screwed in again, the clamping surfaces 28 and 34 at the contact surfaces 62 and 64 come to rest and so the inner ring 56 and thus the roller 12 secure in the newly set position.

3 shows a second embodiment of a bearing assembly according to the invention 70 also on the swivel arm 16 the clamping device 14 can be provided. For reasons of clarity, only the actual storage area has been enlarged.

In this second embodiment, the bearing pin 72 in one piece at the depository 74 provided and has a through hole 76 on. Concentric around the journal 72 is a spherical segment-shaped clamping surface 78 intended. At the clamping surface 78 opposite rear side of the bearing 74 is a concentric to the through hole 76 formed second clamping surface 80 formed, which is in the form of a spherical segment-shaped recess, wherein both clamping surfaces have an identical center M.

From the ball bearing 82 are just the balls 84 as well as the inner ring 86 shown. The inner diameter of the inner ring 86 is larger than the outer diameter of the journal 72 so that the ball bearing 82 opposite the journal 72 can be pivoted.

Between the depository 74 facing end face of the inner ring 86 is a spacer 88 arranged, whose the inner ring 86 facing flat side is flat. The depository 74 facing flat side of the spacer 88 has an annular elevation 90 on, in which a contact surface 92 is provided in the form of a spherical segment-shaped recess. The annular elevation 90 and the contact surface 92 are concentric with the circular spacer 88 is trained. The contact surface 92 is sized and designed so that it fits evenly to the clamping surface 78 the depository 74 snugly.

To secure and adjust the position of the ball bearing 82 , is a screw 94 provided with her screw head 96 at the campsite 74 remote end face of the inner ring 86 abuts and through the through hole 76 protrudes. On the free end of the screw 94 is a spacer ring 98 postponed, at its the clamping surface 80 facing side a spherical segment-shaped contact surface 100 which is also sized and shaped to conform evenly to the clamping surface 80 snugly. The screw is secured 94 by a mother 102 that the spacer ring 98 against the clamping surface 80 biases.

To the position of the rotation axis of the roller 12 just have to stop the mother 102 to be opened slightly. Subsequently, the ball bearing 82 opposite the journal 72 or with respect to the contact surface A of the clamping device 14 be adjusted in its angular position. After adjusting the angular position is the mother 102 only tightened again, causing the contact surface 92 the spacer 88 against the clamping surface 78 and the contact surface 100 of the spacer ring 98 against the clamping surface 80 be preloaded and so the ball bearing 82 secured in its angular position.

In an alternative variant of the second embodiment described above, the screw is supported 94 with her screw head 96 at the back of the depository 74 trained clamping surface 80 off, with the screw head 96 at its the clamping surface 80 facing side with the contact surface 100 is provided. The screw 96 will then be with the help of the mother 102 secured.

In 4 is a third embodiment of a bearing assembly according to the invention 110 shown. In the present case, the ball bearing 112 the roller 114 on an inner bush 116 raised to form a press fit. The inner bush 116 has an outer surface 118 cylindrical shape while extending through the inner sleeve 116 extending bore a conical inner surface 120 having, which concentric to the outer man telfläche 118 runs and moves in the direction of a clamping surface 122 the depository 124 rejuvenated.

The at the clamping surface 122 the depository 124 fitting front side 126 the inner bush 116 is opposite to a right angle to the rotation axis R of the ball bearing 112 extending plane inclined at an angle in a range of 1.0 °, so has a plan of 1.0 °. Consequently, at full surface runs on the clamping surface 122 adjacent end face 126 the inner bush 116 the ball bearing 112 with its axis of rotation opposite the clamping surface 120 just tilted to this plan of 1.0 °.

In the inner bush 116 is a bearing bush 128 introduced, in which the outer lateral surface 130 according to the inner lateral surface 120 the inner bush 116 is formed while the inner circumferential surface 132 the bearing bush 128 is cylindrical. The bearing bush 128 is on the journal 134 postponed. The outer coat area 130 the bearing bush 128 However, with its axis of symmetry is inclined at an angle of 1.0 ° inclined relative to the axis of symmetry of the bearing bush 116 ,

The journal 134 has a covenant at one end 136 on, the other end is in the depository 124 screwed. While in clamped condition the inner bush 116 with her front side 126 at the clamping surface 122 is present, is the depository 124 opposite end face 138 the bearing bush 128 at the federal government 136 of the journal 134 under pretension.

For adjusting the angular position of the roller 114 just need the journal 134 as far as solved, until the two sockets 116 and 128 can be rotated relative to each other. Subsequently, the inner bush 116 relative to the clamping surface 122 adjusted so that the axis of rotation of the ball bearing 112 around the bearing axis of the journal 134 is pivoted, wherein the inclination plane passing through the axis of rotation and the bearing axis of the journal 134 is clamped to the bearing axis is pivoted. Although the rotation axis changes its angular position relative to the bearing axis of the journal 134 considered in the direction of the bearing axis. The inclination of the rotation axis of the ball bearing 112 however, it is retained with respect to the bearing axis. The axis of rotation of the ball bearing 112 thus staggers about the bearing axis of the journal 134 ,

If the clamping surface 122 opposite the bearing axis of the journal 134 deviates from a rectangular course relative to the bearing axis, in this way, the position of the rotational axis of the ball bearing 112 opposite the clamping surface 122 and thus adjusted to the clamping device as a whole.

After adjusting the angular position, only the bearing pin 134 tightened again, leaving the bushing 128 in the inner bush 116 is tense again.

To compensate for such positional errors, preferably a deviation of the course of the clamping surface 122 measured relative to the bearing axis and connect an inner bushing 116 selected, in which the flattening corresponds to the previously measured angle deviation. For example, was a positional deviation of 0.3 ° at the clamping surface 122 measured, an inner bushing with a pitch of 0.3 ° is used to compensate for the angular deviation.

In 5 is a variation of the in 4 shown embodiment shown. In this modification, the inner circumferential surface extends 120 the inner bush 116 with its axis of symmetry inclined to the axis of symmetry of the outer lateral surface 118 , wherein the axis of symmetry is perpendicular to the end face 126 the inner bush 116 runs.

Instead of a bearing bush in this embodiment, the bearing pin 134 with a conically tapered head 140 provided with the bearing pin 134 in the inner lateral surface 118 the inner bush 116 comes to the plant and this secures by tightening in the set angular position.

6 shows a second modification of the in 4 shown embodiment. In this modification, the inner circumferential surface 120 the inner bush 116 in one of the clamping surface 122 facing cylindrical section 142 and a hemispherical cup section 144 divided. To secure the inner bush 116 has the journal 134 a hemispherical head 146 on, with which the bearing pin 134 in the hemispherical cup section 144 the inner lateral surface 118 the inner bush 116 comes to the plant and this secures by tightening in the set angular position. At the same time spherical surfaces allow 144 and 146 a pivoting of the inner bush 116 opposite the journal 134 ,

In 7 is a third variation of the in 4 shown bearing assembly 110 shown. In this modification, instead of the inner sleeve 116 a diagonally slotted inner joint ring 148 and instead of the bearing bush 128 a diagonally slotted bearing hinge 150 used. The inner joint ring 148 has a cylindrical outer surface and a spherical recessed inner surface. The bearing joint ring 150 has a course of the inner circumferential surface of the inner joint ring 148 corresponding spherical outer shape, while the inner circumferential surface is cylindrical. The bearing joint ring 150 is between the clamping surface 122 and the federal government 136 of the journal 134 so clamped and widened so far that the inner joint ring 148 is clamped in position.

When loosening the journal 134 retracts the bearing hinge 150 together, leaving the inner joint ring 148 opposite the bearing hinge 150 adjusted while the angular position of the roller 114 opposite the journal 134 can be changed. Subsequently, only the journal must 134 be tightened again until the widened bearing hinge 150 the inner joint ring 150 in its set angular position.

10

bearing arrangement

12

caster

14

tensioning device

16

swivel arm

18

axis

20

torsion spring

S

swivel axis

A

contact surface

22

depository

24

thread

26

pivot

28

first clamping surface

30

external thread

32

Federation

34

second clamping surface

36

Allen

38

location hole

40

ball-bearing

42

outer ring

44

roll

46

inner ring

48

contact surface

50

contact surface

52

internal bore

54

cap

56

inner ring

58

Distanzbuchse

60

Distanzbuchse

62

contact surface

64

contact surface

70

bearing arrangement

72

pivot

74

depository

76

Through Hole

78

clamping surface

80

clamping surface

82

ball-bearing

84

Bullet

86

inner ring

88

spacer

90

survey

92

contact surface

94

screw

96

screw head

98

spacer

100

contact surface

102

mother

110

bearing arrangement

112

ball-bearing

114

caster

116

inner bushing

118

outer jacket surface

120

inner lateral surface

122

clamping surface

124

depository

126

front

128

bearing bush

130

outer jacket surface

132

inner lateral surface

134

pivot

136

Federation

138

front

140

conical head

142

cylindrical section

144

hemispherical shell shaped section

146

hemispherical head

148

Inner joint ring

150

Bearing joint ring

200

bearing arrangement

202

caster

204

tensioning device

206

swivel arm

208

axis

210

torsion spring

S

swivel axis

A

contact surface

Claims (20)

Bearing arrangement for a roller in a traction drive, in particular for a roller of a tensioning device in a traction drive, with a bearing journal ( 26 ; 72 ; 134 ), on which the roller ( 12 ; 114 ) by at least one rolling bearing ( 40 ; 112 ) is mounted rotatably about a rotation axis, characterized in that the roller ( 12 ; 114 ) with its axis of rotation relative to the bearing axis of the bearing journal ( 26 ; 72 ; 134 ) is limited pivotable and can be fixed in the set angular position. Bearing arrangement according to claim 1, characterized in that the rolling bearing ( 40 ; 112 ) of the roller ( 12 ; 114 ) for fixing the set angular position can be clamped. Bearing arrangement according to claim 1 or 2, characterized in that the bearing journal ( 26 ) a covenant ( 32 ) with a clamping surface ( 34 ), that the journal ( 26 ) at a depository ( 22 ) is provided, on which a further clamping surface ( 28 ) is formed such that the distance between the two clamping surfaces ( 28 ; 34 ) is changeable, and that the inner ring ( 46 ; 56 ) of the rolling bearing ( 40 ) of the roller ( 12 ) between the two clamping surfaces ( 28 ; 34 ) for adjusting the angular position of the axis of rotation of the roller ( 12 ) relative to the bearing axis of the bearing journal ( 26 ) is pivotable and for fixing the angular position between them is clamped. Bearing arrangement according to claim 3, characterized in that the two clamping surfaces ( 28 . 34 ) have concave or convex surfaces which the pivoting area for the roller ( 12 ) establish. Bearing arrangement according to claim 4, characterized in that the inner ring ( 46 ) of the rolling bearing ( 40 ) one at each of its two front sides continuous spherical or concave bearing surface ( 48 . 50 ), and that the inner ring ( 46 ) of the rolling bearing ( 40 ) with the two contact surfaces ( 48 . 50 ) between the two clamping surfaces ( 28 . 34 ) and is clamped between them. Bearing arrangement according to claim 4, characterized in that in each open end face of the inner ring ( 56 ) of the rolling bearing ( 40 ) a spacer bush ( 58 . 60 ), which in the direction of the axis of rotation in the inner ring ( 56 ) and in the radial direction of the inner ring ( 56 ) viewed over the end face of the inner ring ( 56 protruding), wherein each spacer ( 58 . 60 ) at the respective one of the clamping surfaces ( 28 . 34 ) facing end face a circumferential spherical or concave bearing surface ( 62 . 64 ), with which the spacer bushing ( 58 . 60 ) on the clamping surface ( 28 . 34 ) is present. Bearing arrangement according to claim 1, characterized in that the rolling bearing ( 112 ) with an inner ring or in addition to the inner ring with an inner bush ( 116 ) into which or into which a storage section ( 128 ) of the journal ( 134 ) and that by relative adjustment of the inner ring or the inner bushing ( 116 ) to the storage section ( 128 ) the angular position of the rolling bearing ( 112 ) is adjustable and fixable. Bearing arrangement according to claim 7, characterized in that the inner ring or the inner bushing ( 116 ) of the rolling bearing ( 112 ) a rotationally symmetrical to the axis of rotation of the rolling bearing ( 112 ) extending, substantially cylindrical lateral surface ( 118 ), and that on a clamping surface ( 122 ) of the depository ( 124 ) adjacent end face ( 126 ) of the inner ring or the inner bush ( 116 ) with respect to a right-angled to the axis of rotation of the rolling bearing ( 112 ) extending plane is inclined at a predetermined angle, wherein the angle is preferably in a range of 0.1 to 2.0 °, more preferably in a range of 0.2 to 1.0 °. Bearing assembly according to claim 8, characterized in that the predetermined angle corresponds to the angular deviation with which the clamping surface ( 122 ) from a predetermined ideal position with respect to the bearing axis of the bearing ( 134 ) deviates. Bearing arrangement according to claim 7, 8 or 9, characterized in that a bearing bush ( 128 ), which serves as a journal ( 134 ) is inserted, that the inner ring or the inner bushing ( 116 ) or the bearing bush ( 128 ) as a wobble bushing with a conical first lateral surface extending at an angle to the axis of symmetry ( 120 ) is formed, that the bearing bush ( 128 ) or the inner ring or inner bushing ( 116 ) a coaxial with the axis of symmetry extending conical second lateral surface ( 130 ), which with the first lateral surface ( 120 ) comes into contact at least approximately over the entire surface or is in contact with it, that by mutually rotating the inner ring or the inner sleeve ( 116 ) to the bearing book ( 128 ) the axis of rotation of the roller ( 114 ) relative to the longitudinal axis of the journal ( 134 ) and that the head of the fastening screw is dimensioned such that it can be tightened when tightening the fastening screw on the end face of the bearing bush ( 128 ) comes to the plant and the bearing bush ( 128 ) in the inner ring or in the inner bushing ( 116 ) braced. Bearing arrangement according to claim 8 or 9, characterized in that the inner lateral surface ( 120 ) of the inner ring or the inner bushing ( 116 ) at the opening end that the inclined end face ( 126 ) facing away, a hemispherical shell-shaped contact surface ( 144 ), and that as a journal a fastening screw with hemispherical head ( 146 ), which, when tightening the fastening screw on the contact surface ( 144 ) of the inner lateral surface ( 120 ) comes to rest and the inner ring or the inner sleeve ( 116 ) in the adjusted position relative to the bearing ( 124 ) braced. Bearing arrangement according to claim 8 or 9, characterized in that the inner lateral surface ( 120 ) of the inner ring or the inner bushing ( 116 ) starting from its opening end, the inclined end face ( 126 ) facing away, conically tapered, and that as a journal ( 134 ) a fastening screw with conical head ( 140 ), which when tightening the fastening screw on the conically tapering inner lateral surface ( 120 ) comes to rest and the inner ring or the inner sleeve ( 116 ) in the set position relative to the storage location ( 124 ) braced. Bearing arrangement according to claim 7, characterized in that the rolling bearing ( 112 ) with its inner ring or its inner bush ( 116 ) on a slotted running bushing ( 128 ) is pushed, which on one as a journal ( 134 ) fixing screw is pushed, that the bearing bush ( 128 ) between one at the depository ( 124 ) formed first clamping surface ( 122 ) and provided on the fastening screw second clamping surface ( 136 ) is arranged, and that the slotted bearing bush ( 128 ) by reducing the axial distance between the clamping surfaces ( 122 . 136 ) is radially expandable such that the bearing bush ( 134 ) the inner ring or the inner bush ( 116 ) are detected in the set angular position. Bearing arrangement according to claim 13, characterized in that the inner circumferential surface of the inner ring or of the inner bush ( 116 ) is formed as a ball shell, that the outer circumferential surface of the bearing bush ( 128 ) is formed as a ball, and that by pivoting the inner ring or the inner sleeve ( 116 ) relative to the bearing bush ( 128 ) the angular position of the axis of rotation of the roller ( 114 ) relative to the longitudinal axis of the journal ( 134 ) is adjustable. Bearing arrangement according to claim 1, characterized in that the bearing journal ( 72 ) at a depository ( 74 ) is molded or fixed and a through hole ( 76 ) for a clamping element ( 94 ), which for clamping the inner ring ( 86 ) of the rolling bearing ( 82 ) against one at the depository ( 74 ) concentric with the longitudinal axis of the bearing journal ( 72 ) formed clamping surface ( 78 ) through the through hole ( 76 ) protruding, wherein between the clamping surface ( 78 ) and the side facing the inner ring ( 86 ) a spacer element ( 88 ) is provided, and that the clamping surface ( 78 ) and the bearing surface ( 92 ) of the spacer element ( 88 ) are formed complementary to one another in such a way as convex or concave surfaces, that the inner ring ( 86 ) of the rolling bearing ( 82 ) opposite the clamping surface ( 78 ) of the depository ( 76 ) for adjusting the angular position and with the aid of the clamping element ( 94 ) for setting the set angular position against the clamping surface ( 78 ) is clamped. Bearing arrangement according to claim 15, characterized in that the clamping element is a screw ( 94 ), which with its screw head ( 96 ) at the spacer element ( 88 ) facing away from the end face of the inner ring ( 86 ) of the rolling bearing ( 82 ) that the screw ( 94 ) by a on the the journal ( 72 ) facing away from the back of the bearing ( 74 ) screwed nut ( 102 ) is secured at the rear of the storage site ( 74 ) a clamping surface ( 80 ), where the mother ( 102 ) by a clamping surface ( 80 ) complementarily formed contact surface ( 100 ) is supported such that the screw ( 94 ) with its longitudinal axis relative to the longitudinal axis of the bearing journal ( 72 ) is pivotable and clamped in the set angular position. Bearing arrangement according to claim 16, characterized in that the contact surface ( 100 ) mother ( 102 ) at one between the mother ( 102 ) and the clamping surface ( 80 ) of the depository ( 74 ), on the screw ( 94 ) pushed spacer element ( 98 ) is trained. Bearing arrangement according to claim 15, characterized in that the clamping element is a nut secured with a screw, that the nut on the spacer element ( 88 ) facing away from the end face of the inner ring ( 86 ) of the rolling bearing ( 82 ) is located at the back of the bearing ( 74 ) a clamping surface ( 80 ) is provided, on which the screw rests with its screw head, and that the screw head preferably one to the clamping surface ( 80 ) has complementary formed contact surface, with which the screw head on the clamping surface ( 80 ) of the depository ( 74 ) is supported such that the screw with its longitudinal axis relative to the longitudinal axis of the bearing journal ( 72 ) and can be clamped to set the set angular position. Bearing arrangement according to one of the preceding claims, characterized in that the bearing journal ( 26 ; 72 ; 134 ) on a swivel arm ( 16 ) a tensioning device ( 14 ) is provided. Clamping device for traction means, in particular for belts or timing chains of internal combustion engines, with a bearing arrangement ( 10 ; 70 ; 110 ) according to any one of the preceding claims.