阅读说明：本技术 一种圆柱滚子轴承 (Cylindrical roller bearing ) 是由 樊拥军 于 2020-03-27 设计创作，主要内容包括：本发明公开了一种圆柱滚子轴承,包括有外圈、圆柱形的滚子,所述外圈带斜挡边,所述滚子端部带球基面,滚子其靠近滚子的两端处分别带有对数母线和圆弧母线两种凸度。本发明的圆柱滚子轴承,滚子安装更方便、且运行稳定性更强。(The invention discloses a cylindrical roller bearing which comprises an outer ring and a cylindrical roller, wherein the outer ring is provided with an inclined flange, the end part of the roller is provided with a spherical base surface, and the two ends of the roller, which are close to the roller, are respectively provided with two convexity degrees of a logarithmic bus and an arc bus. The cylindrical roller bearing has the advantages of more convenient roller installation and stronger running stability.)

1. The utility model provides a cylindrical roller bearing, is including outer lane, columniform roller, the oblique flange in outer lane area, the roller tip takes the ball base face, and its both ends punishment that is close to the roller of roller do not has two kinds of convexity of logarithm generating line and circular arc generating line, its characterized in that:

the calculation formula of the sphere base surface is as follows:

wherein R is the radius (mm) of the ball base surface at the end part of the roller, h is the height (mm) of the flange, and D_wThe diameter (mm) of the roller is taken, the end face of the roller is intersected with the inclined flange at the height position of 1/2 flange, gamma is a negative back angle (minute), and the value range of the negative back angle gamma is 10 'to 45';

the logarithmic generatrix roller prime line equation is (when the roller is in a flat state, the middle position of the bottom of the roller is taken as the origin of a coordinate system, the x axis of the coordinate system extends along the length direction of the roller, and the y axis extends along the width direction of the roller):

L_we＝L_w-2r；

wherein x has a value in the range ofV is the Poisson's ratio (constant) of the material, E is the elastic modulus (MPa) of the material, Q_maxL, being the maximum load (N) to which the rolling elements are subjected_weIs the effective length (mm) of the roller, L_wThe total length (mm) of the roller, and r is the chamfer radius (mm).

Wherein: f_rIs the radial load (N) borne by the bearing inner ring, Z is the number of rollers, 1/J_rTaking 4.08 (constant) of the total weight,

the equation of the circular arc bus roller plain line is as follows:

wherein Rc' refers to the radius (mm) of the circle where the arc generatrix is positioned, L_wIs the total length (mm) of the roller, t₁The maximum chamfer (mm) of the roller, t is 0.15 (L)_w-2t₁) The convexity value (mm) is set.

2. The cylindrical roller bearing according to claim 1, wherein: the roller has pockets at both ends.

3. The cylindrical roller bearing according to claim 2, wherein: and the recesses at the two ends of the roller are respectively provided with a mark for distinguishing one end of the roller corresponding to the convexity of the logarithmic generatrix and one end of the roller corresponding to the circular arc generatrix.

4. The cylindrical roller bearing according to any one of claims 1 to 3, wherein:

and the convexity of the roller is processed by single grinding through a tool grinding tool.

Technical Field

The invention relates to a cylindrical roller bearing.

Background

The bearing rolling elements are indispensable parts in rolling bearings. Practical use and tests show that the roller is the weakest part in the roller bearing, and the design and manufacturing quality of the roller have great influence on the working performance of the bearing and are main factors influencing the service life of the bearing. And the early failure of the roller mainly occurs at the end part of the roller or the area of the raceway close to the end part of the roller, and particularly when the bearing is in the actual working condition of unbalance loading, because the loading conditions at two sides of the cylindrical roller are different, the edge effect is very easy to generate between the roller and the outer ring flange, the bearing is worn too fast, and the normal operation of the bearing is influenced.

In order to solve the problems, the prior art generally adopts a structural design that a bearing outer ring is provided with an inclined flange, the end part of a roller is provided with a spherical base surface, an outer circle is provided with a logarithmic generatrix and an arc generatrix, and the adoption of the structure improves the defect to a certain extent, but the effect still needs to be improved.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the cylindrical roller bearing which is more suitable for the unbalance loading working condition, more stable in work and longer in service life.

In order to achieve the purpose, the invention provides a cylindrical roller bearing, which comprises an outer ring and a cylindrical roller, wherein the outer ring is provided with an inclined flange, the end part of the roller is provided with a spherical base surface, the two ends of the roller, which are close to the roller, are respectively provided with two convexity degrees of a logarithmic generatrix and an arc generatrix,

the calculation formula of the sphere base surface is as follows:

wherein R is the radius (mm) of the ball base surface at the end part of the roller, h is the height (mm) of the flange, and D_wThe diameter (mm) of the roller is taken, the end face of the roller is intersected with the inclined flange at the height position of 1/2 flange, gamma is a negative back angle (minute), and the value range of the negative back angle gamma is 10 'to 45';

the logarithmic generatrix roller prime line equation is (with the roller bottom middle position as the coordinate system origin, the x-axis of the coordinate system extends along the length direction of the roller, the y-axis extends along the width direction of the roller):

L_we＝L_w-2r；

wherein x has a value in the range ofV is the Poisson's ratio (constant) of the material, E is the elastic modulus (MPa) of the material, Q_maxL, being the maximum load (N) to which the rolling elements are subjected_weIs the effective length (mm) of the roller, L_wIs the total length (mm) of the roller, r isCorner radius (mm).

Wherein: f_rIs the radial load (N) borne by the bearing inner ring, Z is the number of rollers, 1/J_rTaking 4.08 (constant) of the total weight,

the equation of the circular arc bus roller plain line is as follows:

wherein Rc' refers to the radius (mm) of the circle where the arc generatrix is positioned, L_wIs the total length (mm) of the roller, t₁The maximum chamfer (mm) of the roller, t is 0.15 (L)_w-2t₁) The convexity value (mm) is set.

Further, the roller has pockets at both ends. The arrangement of the recess can be used for storing oil, and the rolling effect of the roller is improved.

Furthermore, the concave cavities at the two ends of the roller are respectively provided with a mark for distinguishing one end of the roller corresponding to the convexity of the logarithmic generatrix and one end of the roller corresponding to the circular arc generatrix. The marks are arranged in the recess for easy identification and will not affect the roller operation.

Further, the roller convexity is processed by single grinding through a tool grinding tool. By adopting the processing mode, the processing precision of the convexity of the roller can be improved, and the processing efficiency is higher.

The invention has the beneficial effects that: the roller bearing is further optimized on the basis of the conventional roller bearing with the cylindrical belt logarithmic bus and the circular arc bus, integrates the advantages of two kinds of convexity, reduces the risk of stress concentration, improves the capability of the bearing for running flat and stable and resisting deflection and overturning moment, reduces noise and rotating moment, and is particularly suitable for the actual working condition of unbalance loading.

Drawings

FIG. 1 is a schematic view of the mating of a roller without a ball base and an outer ring rib;

FIG. 2 is a schematic view of the engagement of a roller with a spherical base and an outer race rib in an embodiment of the invention;

FIG. 3 is a schematic view of the contact position of the inclined ribs and the rollers in the embodiment of the present invention;

FIG. 4 is a schematic diagram of a roller pair generatrix of a coordinate system in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of a roller chamfer in an embodiment of the present invention.

Detailed Description

An embodiment of a cylindrical roller bearing of the present invention is shown in the figures: comprises an outer ring 1 and a cylindrical roller 2, wherein the outer ring 1 is provided with an inclined flange 11, the end part of the roller 2 is provided with a spherical base surface 21 (see figure 2), two convexity degrees of a logarithmic generatrix 2a and an arc generatrix 2b are respectively arranged at the two ends of the roller 2 close to the roller,

the calculation formula of the sphere base surface 21 is (see fig. 3):

wherein R is the radius (mm) of the ball base surface at the end part of the roller, h is the height (mm) of the flange, and D_wThe diameter (mm) of the roller is taken, the end face of the roller is intersected with the inclined retaining side at the height position of the 1/2 retaining side, gamma is a negative back angle (minute), the value range of the negative back angle gamma is 10 'to 45', and the negative back angle refers to the radial included angle of the outer ring inclined retaining side relative to the outer ring;

the logarithmic generatrix roller plain equation is (when the roller is in a flat state, with the roller bottom middle position as the origin of the coordinate system, the x-axis of the coordinate system extends along the length direction of the roller and the y-axis extends along the width direction of the roller, see fig. 4):

L_we＝L_w-2r；

wherein x has a value in the range ofV is the Poisson's ratio (constant) of the material, E is the materialModulus of elasticity (MPa), Q of the material_maxL, being the maximum load (N) to which the rolling elements are subjected_weIs the effective length (mm) of the roller, L_wIs the total length (mm) of the roller, r is the chamfer radius (mm), and the chamfer r is schematically shown in figure 5.

Wherein: f_rIs the radial load (N) borne by the bearing inner ring, Z is the number of rollers, 1/J_rTaking 4.08 (constant) of the total weight,

the equation of the circular arc bus roller plain line is as follows:

wherein Rc' refers to the radius (mm) of the circle where the arc generatrix is positioned, L_wIs the total length (mm) of the roller, t₁The maximum chamfer (mm) of the roller, t is 0.15 (L)_w-2t₁) The convexity value (mm) is set.

The roller has pockets 23 at both ends, and the pockets 23 at both ends of the roller are preferably centrosymmetric along the axis of the roller. The concave cavities 23 at the two ends of the roller are respectively provided with a mark for distinguishing one end of the roller corresponding to the convexity of the logarithmic generatrix and one end of the roller corresponding to the circular arc generatrix. The marks can be paints with two color numbers respectively coated in the recesses at the two ends of the roller, and can also be nicks arranged in the recesses, as long as the marks can identify the two ends of the roller and do not influence the service performance. Because the convexity of the two ends of the roller is difficult to visually distinguish by naked eyes, the convexity is distinguished by marks, and links such as processing, assembly and the like of the bearing are facilitated.

The roller convexity is processed by grinding the tool grinding tool, so that the processing precision of the roller convexity can be improved, and the processing efficiency is higher.

The above embodiment is only one of the preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.