DE102017113457A1 - Bearing device and steering head bearing assembly for a bicycle with the storage facility - Google Patents

Abstract

The steering assembly of a bicycle usually has a steering head, wherein a fork is guided in a steering tube and rotatably supported, so that a steering movement to the front wheel is transferable. The steering head has for this purpose usually two bearings, which are provided on the steerer tube.
For this purpose, a bearing device 1, with a first and a second raceway 6, 7, with a plurality of rollers 4, wherein the rollers 4 between the first and the second raceway 6, 7 are arranged rolling around a main axis of rotation A1, wherein each roller 4th rotated about a roller rotational axis associated therewith A2, proposed, wherein the first and / or the second track 6, 7 has a relative to the main axis of rotation A1 circumferential profiling 8, so that the rollers 4 to the first and / or the second track 6, 7th in at least one axial end portion 4a, b of the rollers 4 are spaced.

Description

The invention relates to a bearing device with the features of the preamble of claim 1. Furthermore, the invention relates to a steering head bearing assembly for a bicycle with the bearing device.

The steering assembly of a bicycle usually has a steering head, wherein a fork is guided in a steering tube and rotatably supported, so that a steering movement to the front wheel is transferable. The steering head has for this purpose usually two bearings, which are provided on the steerer tube.

The publication DE 10 2013 212 471 A1 , which forms probably the closest prior art, discloses a steering head bearing assembly for rotatably supporting a steering shaft of a two- or three-wheel in a frame head tube with a first and a second rolling bearing, wherein the two rolling bearings are arranged at an axial distance from each other and each roller bearing with a Frame tube head in operatively connected outer ring, one standing in operative connection with the steering shaft inner ring and rolling elements, wherein the rolling elements roll on provided by the inner rings and outer races raceways.

It is an object of the present invention to propose a bearing device, which is characterized by an improved performance.

This object is achieved by a bearing device with the features of claim 1 and with a steering head bearing arrangement with the bearing device having the features of claim 10. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims, the following description and the accompanying drawings.

The invention relates to a bearing device which is suitable and / or designed for a steering head bearing assembly. In particular, the steering head bearing assembly for a bicycle, especially a motorcycle or a bicycle, trained and / or suitable. The bearing device serves for the rotatable mounting of a steering shaft. Preferably, the bearing means for radial and / or axial mounting of the steering shaft is formed. The bearing device is preferably designed as a rolling bearing.

The bearing device has a first and a second track and a plurality of rollers, wherein the rollers between the first and the second track are arranged to roll around a main axis of rotation. In particular, the two raceways are arranged coaxially and / or concentrically with respect to the main axis of rotation. Preferably, the first and / or the second track on a hardened and / or polished surface. The two raceways may be formed at least partially parallel to each other. Alternatively, however, the two raceways can also converge to one another, so that, for example, a tapered roller can be arranged between the two raceways.

Each roller rotates, in particular during operation of the bearing device, about a roller rotation axis associated therewith. Preferably, the rollers are arranged on a common pitch circle, wherein the rollers are preferably in the direction of rotation with respect to the main axis of rotation regularly from each other. In particular, the rollers define with their axis of rotation or longitudinal axis of the roller rotation axis.

In the context of the invention, it is proposed that the first and / or the second track have a circumferential profile with respect to the main axis of rotation, so that the rollers are spaced apart from the first and / or second track in at least one or exactly one end area of the rollers. Thus, the rollers preferably contact the centers centrally with the two raceways, wherein the rollers in particular free end or contactless rotate in the end region. The profiling may be formed as at least or exactly one rotationally symmetrical recess, which is introduced, for example, in the running surface of the first and / or the second career, or preferably as at least one rounded edge. Preferably, each of the raceways on exactly two spaced profiling. Particularly preferably, the profiling extends completely in the direction of rotation, in particular without interruption. In particular, the or at least one further profiling is arranged in a first or in a second the first opposing axial end region on the first and / or the second raceway.

The advantage of the invention is in particular that due to the profiling in one or the two end regions of the rollers, an edge pressure and thus a possible damage to the raceways is significantly reduced. Furthermore, at the same time the friction of the bearing device can be improved. The inventive design of the raceways thus the operating behavior and the life of the bearing device is significantly increased. Another advantage of the invention is that by the profiling a game between the two running surfaces or between the rollers and at least one of the two treads is generated, which, for example, to compensate for manufacturing component tolerances or Adjustment of misalignment of the steering head bearing assembly is used.

In a preferred embodiment of the invention, the first and / or the second track, in particular viewed in a cross section, a contact portion and at least or exactly one profile section, wherein the profiling is arranged in the profile section. In particular, the first and / or the second raceway may each have exactly two profile sections, wherein the contact section is preferably arranged between the two profile sections. Preferably, the at least one or the two profile sections directly adjoin the contact section.

The rollers contact the first and the second track in the contact section with respect to the roller rotational axis linear, in particular linear. In particular, the track in the contact section has a running surface that is planar in cross-section or longitudinal section. Preferably, the rollers contact the raceway in the axial direction with respect to the roller rotation axis at least approximately in the entire contact section. In particular, the raceway, in particular the contact portion may be aligned parallel to the roller rotation axis.

The first and the second track extends in the profile section diverging to the roller shell surface. In particular, the track in the profile section on a curved or sloping tread. Preferably, an at least approximately wedge-shaped air gap is formed in the profile section between the rollers and the raceway, in particular in a cross-section.

In a preferred embodiment of the invention, the bearing device has an inner ring, an outer ring and a cage. The two rings are preferably arranged coaxially and / or concentrically with respect to the main axis of rotation. In particular, the inner ring and / or the outer ring rotate in an operation of the bearing device relative to each other about the main axis of rotation. For example, the inner ring with a steerer tube and the outer ring with a steering tube rotatably connected, so that the steering head bearing assembly is formed.

The cage serves to receive the rollers and can be designed in particular as a sheet metal cage or a solid cage, wherein the rollers are captively received in the cage. Preferably, the cage is made of plastic or steel. In particular, the cage has receiving pockets, each receiving pocket being associated with a roller. Thus, the rollers are evenly spaced in the direction of rotation with respect to the main axis of rotation. The inner ring has the first raceway and the outer ring has the second raceway. In particular, the inner race has on its outer circumference the first raceway and the outer race on its inner circumference the second raceway.

In a development of the invention, the profiling has a convex cross-sectional profile. In particular, the convex cross-sectional profile is formed by a rounding off of at least one outer edge and / or an inner edge of the first and / or the second raceway.

In a constructive implementation, the profiling is produced by forming technology. In principle, the profiling can be formed by hot forming or warm forging. Particularly preferably, however, the profiling is formed by cold forming. For example, the profiling is formed by pressure forming according to DIN 8583 or by Zugdruckumformen according to DIN 8584. In a preferred implementation, the profiling is produced by passing or extruding.

In a further embodiment, the bearing device is designed as an angular contact bearing, so that the bearing device can absorb in particular both axial and radial forces. Thus, the roller pivot axes intersect a radial plane arranged with respect to the main axis of rotation. The first raceway is formed by a frusto-conical outer cone so that the inner ring has a tapered outer surface having the first raceway.

The second raceway is formed by a frusto-conical inner cone so that the outer ring has a tapered inner surface having the second raceway. Particularly preferably, the steering head bearing arrangement has exactly two of the bearing devices configured as an angular contact bearing, wherein the two bearing devices are aligned with one another, preferably axially spaced from one another.

In a first specific embodiment, the rollers are designed as needle rollers. In the formation as needle rollers, the rollers have a length in the axial direction with respect to the roller rotation axis, which is at least five times as large as the diameter of the respective rolling element. In particular, the needle rollers are designed according to DIN 5402-3.

In a second alternative embodiment, the rollers are designed as cylindrical rollers. In the formation as cylindrical rollers, the rollers have a length in the axial direction with respect to the roller rotation axis, which is less than five times as large as the diameter of the respective rolling element. In particular, the cylindrical rollers are designed according to DIN 5402-1.

Another object of the invention relates to the steering head bearing assembly for the bicycle with the bearing device according to one of the preceding claims or as has been previously described, wherein the bearing means is designed for rotatable mounting of the steering shaft.

• 1 eine stark vereinfachte Darstellung einer Lagereinrichtung in einem Querschnitt entlang der Hauptdrehachse als ein Ausführungsbeispiel der Erfindung;
• 2 eine Detailansicht einer Rolle der Lagereinrichtung aus 1.

Further features, advantages and effects of the invention will become apparent from the following description of a preferred embodiment of the invention and the accompanying figures. These show:

• 1 a greatly simplified representation of a bearing device in a cross section along the main axis of rotation as an embodiment of the invention;
• 2 a detailed view of a role of the storage facility 1 ,

Corresponding or identical parts are each provided with the same reference numerals in the figures.

1 shows a schematic representation of a cross section through a bearing device 1 , The storage facility 1 is for example designed for rotatable mounting of a steering shaft, wherein the bearing device 1 this is a part of a steering head bearing assembly of a two-wheeler, eg motorcycle or bicycle, or a tricycle. The storage facility 1 is designed as an angular bearing and serves for the axial and radial bearing or force absorption of the steering shaft. For example, the steering head bearing assembly by exactly two of the storage facilities 1 formed, wherein the two bearing means are arranged axially spaced from each other.

The storage facility 1 has an inner ring 2 , an outer ring 3 and a plurality of roles 4 , which are accommodated in a cage 5, on. The inner ring 2 and the outer ring 3 are coaxial with respect to a main axis of rotation A1 arranged. In an operation of the storage facility 1 or in a steering movement of the two- or three-wheeler are the two rings 2 . 3 relative to each other about the main axis of rotation A1 rotatable, being at the same time every role 4 around a roller rotation axis associated with it A2 rotates.

The roles 4 are captive in the cage 5 included in so-called receiving pockets. The cage 5 serves as a spacer between the individual roles 4 so that these are uniform in the direction of rotation with respect to the main axis of rotation A1 between the two rings 2 . 3 are arranged spaced from each other. For example, the cage 5 is formed as a plastic cage or a steel cage.

The inner ring 2 is formed as a straight hollow truncated cone. In other words, the inner ring 2 a smaller outer diameter at a first axial end 2a on, wherein the outer diameter gradually to a second axial end 2 B enlarged. The outer ring 3 is formed as a straight hollow cylinder, wherein the bore of the hollow cylinder has a countersink. Accordingly, the outer ring 3 thus a smaller inner diameter in the region of the first end 2a with the diameter gradually increasing to the second end 2 B enlarged.

The inner ring 2 has a first career 6 and the outer ring 3 a second career 7 on. The first career 6 is on the outer circumferential surface of the inner ring 2 and the second career 7 on the inner circumferential surface of the outer ring 3 arranged. The roles 4 are between the first and the second career 6 . 7 arranged and rolled on the two raceways 6 . 7 in the direction of rotation. The roller rotation axis cuts A2 one with respect to the main axis of rotation A1 arranged Radialebe at an angle of eg more than 30 degrees. For example, the outer ring 3 with a steering tube and the inner ring operatively connected to a steerer tube of the bicycle, so that during a steering movement of the steerer tube relative to the steering tube about the main axis of rotation A1 is pivotable.

2 shows in a detailed view of the storage facility 1 one of the roles 4 from the 1 , The roles 4 are designed as needle rollers or cylindrical rollers. Preferably, at a ratio of length to diameter of the roll 4 up to 5: 1 from a cylindrical roller, and above that from a needle roller. Alternatively or additionally, the role indicates 4 a diameter less than 4 mm, preferably less than 3 mm and in particular less than 2 mm.

The inner ring 2 and the outer ring 3 each have a profiling 8th on, taking the profiling 8th continuously in the direction of rotation with respect to the main axis of rotation A1 extends. The profiling is preferred 8th formed by a rotationally symmetrical rounding with a convex cross-sectional profile. The first and the second career 6 . 7 each have a contact section 6a . 7a and a first and a second profile section 6b . c ; 7b . c on. The investment section 6a . 7a is between the two profile sections 6b . c ; 7b . c arranged, with the two profile sections 6b . c ; 7b . c directly to the plant section 6a . 7a connect. In the investment section 6a . 7a contacted the role 4 the first and the second career 6a . 7a linear.

The first profile section 6b . 7b points in a first axial end region 4a in relation to the roller rotation axis A2 that rolls 4 the profiling 8th on. Furthermore, the second profile section 6c . 7c in a first opposite second axial end region 4b the roles 4 also the profiling 8th on. The first and the second career 6 . 7 diverge in the first and second profile section 6b . c ; 7b . c to a roller shell surface 9 the role 4 ,

This is the role 4 in the first and the second profile section 6b . c ; 7b . c spaced to the two raceways 6 . 7 arranged. This has the particular advantage that on the one hand the bearing friction of the bearing device 1 reduced as well as an edge pressure in the two end areas 4a , b of the rolls 4 is avoided. The profiling 8th is preferred by a cold forming, eg, through, deep drawing, extrusion etc. of the raceways 6 . 7 educated.

LIST OF REFERENCE NUMBERS

1

Storage facility

2

inner ring

2a

first end

2 B

second end

3

outer ring

4

roll

4a

first end area

4b

second end area

5

Cage

6

first career

6a

contact section

6b, c

profile sections

7

second career

7a

contact section

7b, c

profile sections

8th

profiling

9

Roller shell surface

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102013212471 A1 [0003]

Claims (10)

Bearing device (1), having a first and a second track (6, 7), with a plurality of rollers (4), wherein the rollers (4) between the first and the second track (6, 7) rolling around a main axis of rotation ( A1), wherein each roller (4) rotates about an associated roller rotational axis (A2), characterized in that the first and / or the second track (6, 7) with respect to the main axis of rotation (A1) circumferential profiling ( 8) so that the rollers (4) are spaced from the first and / or second raceways (6, 7) in at least one axial end region (4a, b) of the rollers (4). Bearing device (1) after Claim 1 , characterized in that the first and / or the second raceway (6, 7) has a contact section (6a, 7a) and at least one profile section (6b, c; 7b, c), wherein the profile section (6b, c; c) has the profiling (8), wherein the rollers (4) linear contact the first and the second track (6, 7) in the abutment portion (6a, 7a) with respect to the roller rotation axis (A2), and wherein the first or the second raceway (6, 7) in the profile section (6b, c; 7b, c) extend divergently to a roller jacket surface (9). Bearing device (1) after Claim 1 or 2 , characterized in that the bearing device (1) has an inner ring (2), an outer ring (3) and a cage (5), wherein the inner ring (2) the first and the outer ring (3) has the second career (6, 7), and wherein the rollers (4) captive in the cage (5) are added. Bearing device (1) according to one of the preceding claims, characterized in that the profiling (8) has a convex cross-sectional profile. Bearing device (1) according to one of the preceding claims, characterized in that the profiling (8) is produced by forming technology. Bearing device (1) after Claim 5 , characterized in that the profiling (8) is produced by means of passage or extrusion. Bearing device (1) according to one of the preceding claims, characterized in that the bearing device (1) is designed as an angular contact bearing. Bearing device (1) according to one of the preceding claims, characterized in that the rollers (4) are designed as needle rollers. Bearing device (1) according to one or more of Claims 1 to 7 , characterized in that the rollers (4) are designed as cylindrical rollers. Steering-head bearing arrangement for a bicycle with the bearing device (1) according to one of the preceding claims, characterized in that the bearing device (1) is designed for the rotatable mounting of a steering shaft.

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