DE102008028164A1 - Roller i.e. cylindrical roller, for e.g. cylindrical roller bearing, has front surface formed at preset distance from middle axis to reduction region in accordance with bent curve, where specific maximum and minimum constants are provided - Google Patents

Abstract

wobei x der Abstand von der Rollenmittenachse ist, wobei y_max und y_min jeweils einen Profilabfall entlang der x-Koordinate in mm beschreiben, wobei D_w der nominale Durchmesser der Stirnseite ist und im jeweils ersten Klammerausdruck für y_max und y_min als dimensionslose Größe in mm einzusetzen ist, wobei r_max und r_min der maximale und der minimale Radius der Kantenkürzung sind und wobei K_max und K_min Konstanten zwischen 6 und 100 sind, wobei K_max größer gleich K_min ist.The invention relates to a roller for a roller bearing, wherein at least one end face of the roller is formed at a predeterminable distance from the roller center axis to an edge shortening region according to a curved curve, which is formed running between the two limit curves y _max and y _min ,

where x is the distance from the roller center axis, where y _max and y _min each describe a profile drop along the x-coordinate in mm, where D _{w is} the nominal diameter of the face and in each first bracket expression for y _max and y _min as dimensionless size in mm, where r _max and r _{min are} the maximum and minimum radius of the edge truncation and where K _max and K _{min are} constants between 6 and 100, where K _{max is} greater than or equal to K _min .

Description

The The invention relates to a roller and a roller bearing with the roller.

Out The prior art is a series of roller bearings, in particular Cylindrical and tapered roller bearings are known in which at least one the rolling surface elements for the rollers with at least a so-called board is formed on the at least one outer ring-like area at least one end face of the rollers also during normal operation of the roller bearing intended to start. This area can also be called a so-called Stirnseitenverblendungsbereich be specially designed on the towards the radially outward side, the so-called edge shortening area and radially inward the remaining end face of the roll connects, with the remaining end side substantially plan, with or without dimple or otherwise can be designed.

For example, in the DE 102 30 357 B4 an embodiment for the blind area is described, but which is still suboptimal in view of a low friction between roller and board.

A Object of the present invention is doing a role with to create an improved veneering area.

The The object is solved by the subject matter of claim 1. Advantageous embodiments are in the subclaims described.

wobei x der Abstand von der Rollenmittenachse ist, wobei y_max und y_min jeweils einen Profilabfall entlang der x-Koordinate in mm beschreiben, wobei D_w der nominale Durchmesser der Stirnseite ist und im jeweils ersten Klammerausdruck für y_max und y_min als dimensionslose Größe in mm einzusetzen ist, wobei r_max und r_min der maximale und der minimale Radius der Kantenkürzung sind, und wobei K_max und K_min Konstanten zwischen 6 und 100 sind, wobei K_max größer gleich K_min ist.In claim 1, a roller for a roller bearing is described, wherein at least one end face of the roller is formed at a predeterminable distance from the roller center axis to an edge shortening region according to a curved curve, which is formed running between the two limit curves y _max and y _min , in which

where x is the distance from the roller center axis, where y _max and y _min each describe a profile drop along the x-coordinate in mm, where D _{w is} the nominal diameter of the face and in each first bracket expression for y _max and y _min as dimensionless size in mm, where r _max and r _{min are} the maximum and minimum radius of edge truncation, and where K _max and K _{min are} constants between 6 and 100, where K _{max is} greater than or equal to K _min .

extensive Test series have shown that with a front side facing, which lies within the previously defined limits, the contact conditions Especially improved in on-board contact and just the maximum compressive stresses are comparatively low with advantage. Furthermore, at a Cabinets or tilting the rollers of the contact point between Roller face and the example on the inner rolling surface element trained board held radially as far as possible inside, whereby advantageously the friction is minimized. Friction, temperature and the risk of so-called burrowers are also beneficial much lower.

Further Advantages, features and details of the invention will become apparent the embodiment described below the Invention based on the figure.

The Figure shows as an embodiment of the invention a partial longitudinal section through a so to speak upright cylindrical roller in the right area of its lower Roller end. Here is the roller center axis with dash-dotted line M of the cylindrical roller shown. To this is perpendicular an x-axis a Cartesian coordinate system, which is thus essentially aligned along the roller face. The roller center axis M can thus be considered as a y-axis of the Cartesian coordinate system be understood.

In this case, the section shows the roller end profile y only in a region which is spaced apart from the roller center axis greater than 0.8 · D _W / 2 and less than 0.95 · D _W / 2, where D _{W is} the nominal roller diameter of the cylindrical roller. In the illustrated area, the roller end profile y of the cylindrical roller is also provided for normal operation of the cylindrical roller bearing for starting, for example, on a trained on the bearing inner ring of the cylindrical roller bearing board.

In the range greater than 0.95 · D _W / 2, the roll face merges into the so-called edge shortening area. In the range of small 0.8 · D _W / 2, the roller end side is substantially flat or the course y continuing and formed with or without a dimple.

The lower roller end is correspondingly radially encircling formed previously described. The upper roller front side with respect to a center point area of the cylindrical roller on the roller center axis M perpendicular plane mirror image trained accordingly. The connecting the two roller end faces Mantle region of the cylindrical roller can be substantially straight, slightly bulged outward, with a logarithmic Profile or the like may be formed.

The course y is designed such that it runs free of a change in the curvature behavior between two limit curves y _max and y _min , wherein

The nominal diameter D _{W of} the cylindrical roller is 50 mm. The constants K _max and K _min are both chosen equal to 20, wherein the cylindrical roller is made by a hard turning comprehensive process. The maximum and minimum radius of the edge reduction r _max and r _min are selected as follows: r min = 0.1 + 0.0045 · D W 1.3 and r Max = 0.35 + 0.09 × D W 0.8 ,

Here, D _W and also the distance x are to be used as dimensionless variables in mm, the limit curves y _max and y _{min then} also being given as dimensionless quantities in mm.

In the illustration in the figure, it should be expressly pointed out that the scaling along the roll center axis is much further expanded than that along the x-axis, otherwise all the curves y, y _max and y _{min are} very flat and hardly distinguishable with the same scaling. would be close to each other to represent.

In other embodiments, the values for r _min and r _{max may} also be determined according to DIN 5402-1 may be selected and / or for hard sanded rollers with D _w ≤ 30 mm, the constants K _max and K _min in particular less than or equal to 17 may be selected for sliding-ground rollers with D _w ≥ 30 mm greater than or equal to 70.

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 10230357 B4 [0003]

Cited non-patent literature

• - DIN 5402-1 [0017]

Claims (13)

Roller for a roller bearing, wherein at least one end face of the roller is formed at a predeterminable distance from the roller center axis to an edge shortening region according to a curved curve which is formed running between the two limit curves y _max and y _min , wherein

where x is the distance from the roller center axis, where y _max and y _min each describe a profile drop along the x-coordinate in mm, where D _{w is} the nominal diameter of the face and in each first bracket expression for y _max and y _min as dimensionless size in mm, where r _max and r _{min are} the maximum and minimum radius of edge truncation, and where K _max and K _{min are} constants between 6 and 100, where K _{max is} greater than or equal to K _min . Roll according to claim 1, wherein r _min ≈ 0.1 + 0.0045 · D _W ^1.3 and / or r _max ≈ 0.35 + 0.09 · D _W ^0.8 , where D _W is the dimensionless size in mm and r _max and r _{min are given} as dimensionless quantities in mm. Roller according to claim 1, wherein r _min and / or r _{max are selected} according to DIN 5402-1. Roller according to one of claims 1 to 3, wherein the predetermined distance is greater than 0.5 · D _w / 2, in particular greater than 0.7 · D _w / 2. Roll according to one of claims 1 to 4, wherein K _max and K _{min are selected} between 6 and 100. Roller according to one of claims 1 to 5, wherein K _max are chosen equal to K _min and / or r _max equal to r _min . Roller according to one of claims 1 to 6, wherein K _max and K _min are chosen for hard sanded rollers with D _w ≤ 30 mm less than or equal to 17. A roll according to any one of claims 1 to 6, wherein K _max and K _{min are selected} to be 70 or greater than or equal to 70 for slotted rolls with D _w ≥ 30 mm. Roller according to one of claims 1 to 6, wherein K _max and K _{min are} chosen for hard-turned rollers in a range between 17 and 21. Roller according to one of claims 1 to 9, wherein the curve is substantially free of a curvature behavior change is trained. Roller according to one of claims 1 to 10, wherein a range between the predetermined distance and the edge shortening area for starting on a board of a rolling surface element the roller bearing is provided. Roller according to one of claims 1 to 11, wherein the roller is formed as a cylindrical roller of a cylindrical roller bearing and D _{W is} the nominal roller diameter of the cylindrical roller. Roller bearing with rollers according to one of the claims 1 to 12.