Design method of cylindrical roller bearing inner ring rib ball base surface

Abstract

The application provides a design method for a cylindrical roller bearing inner ring rib ball base surface, determines the diameter Dw of a rolling body and the angle of an inner ring rib inclination angle; a reference line where a ball base surface center is located is located on the inner side limiting surface of the inner ring rib and is close to the outer peripheral surface of the inner ring rib, the theoretical position of the contact point of the ball base surface and the inner ring rib is calculated according to the diameter of the rolling body, and the position of the ball base surface center is determined. After optimization, the reliability of the contact between the cylindrical roller and the inner ring rib is improved, the inner ring rib angle machining allowance can be improved as the ball base surface radius decreases, the machining difficulty is reduced, the yield and the good product rate are improved, the oval cutting is not prone to occur under heavy load, and the contact trace is better.

Description

TECHNICAL FIELD

[0001] The design optimization scheme is mainly applied to cylindrical rolling element bearings and belongs to the technical field of rolling element bearings. BACKGROUND

[0002] In the traditional scheme, the ball base surface of the cylindrical roller is determined with the center of the roller rotation center line as the reference to determine the center of the circle, and the ball base surface radius is large, which makes the operation prone to deviation, causes oval cutting, has small machining allowance, and has high machining requirements. Based on this status, higher requirements are put forward for the contact between the cylindrical roller and the inner ring rib during operation, and therefore the design of the ball base surface of the cylindrical roller needs to break the convention and optimize the contact trace of the roller and the inner ring rib to improve the operation reliability of the bearing. SUMMARY

[0003] The purpose of the present application is to provide a cylindrical roller bearing inner ring rib ball base surface design method, which improves the design accuracy and reliability, shortens the design time and reduces the cost.

[0004] To solve the above technical problems, the technical scheme of the present application is as follows: a cylindrical roller bearing inner ring rib ball base surface design method: step one: determine the diameter Dw of the rolling element and the angle of the inner ring rib inclination angle; step two: determine the ball base surface center reference line according to the rolling element diameter Dw of step one; the ball base surface center reference line is located on the inner side limit surface of the inner ring rib close to the outer peripheral surface of the inner ring rib; step three: determine the radius of the ball base surface according to the rolling element diameter Dw of step one; step four: calculate the theoretical position of the contact point of the ball base surface and the inner ring rib according to the rolling element diameter Dw of step one.

[0005] Further, the specific steps of step two are as follows: calculate the eccentricity Es according to the rolling element diameter Dw of step one to determine the ball base surface center reference line; the eccentricity Es=0.25*Dw.

[0006] Further, the specific steps of step three are as follows: calculate the ball base surface radius SR according to the rolling element diameter Dw of step one to determine the ball base surface radius; the ball base surface radius SR=12*Dw.

[0007] Further, the specific steps of step four are as follows: calculate the ball base surface theoretical contact point c according to the rolling element diameter Dw of step one; the theoretical contact point c=0.125*Dw.

[0008] Further, the position of the ball base surface center is determined according to the ball base surface center reference line, the radius of the ball base surface, and the theoretical position of the contact point.

[0009] The present invention has the following beneficial effects: 1. Improves the reliability of contact between the cylindrical roller and the inner ring flange. As the radius of the spherical base decreases, the machining allowance of the inner ring flange angle can be increased, reducing machining difficulty, improving yield and quality, and making it less prone to elliptical truncation under heavy loads, resulting in better contact marks; 2. Reduces collisions between the roller and the inner ring flange. When machining the inner ring flange, straightness is an important geometric tolerance requirement. Even slight deviations increase the risk of collision between the roller and the inner ring flange. Therefore, this application increases the gap between the roller edge and the root of the inner ring flange, which fundamentally reduces the risk of collision, while also reducing machining burden, rework rate and machining costs, and improving product reliability; 3. Versatility. With the advantage of continuously improving tolerance, this application can also be matched with various bearings, reducing product costs from the design source while still achieving significant performance improvements. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram showing the location of the baseline of the center of the existing spherical base surface;

[0012] Figure 2 This is a schematic diagram showing the location of the baseline of the center of the spherical base surface in this application;

[0013] Figure 3 This is a schematic diagram showing the position of the baseline of the center of the spherical base surface after the existing technology's edge offset by 5'.

[0014] Figure 4 This is a schematic diagram showing the position of the baseline of the center of the spherical base surface after the edge of the spherical base is offset by 5' in this application;

[0015] Figure 5 This is a schematic diagram of the rolling element structure;

[0016] Figure 6 A schematic diagram showing the dimensions of the rolling elements;

[0017] Figure 7 This is a schematic diagram showing the dimensions of the sphere base surface of a rolling element.

[0018] In the figure: 1 is the center line of the rolling element; 2 is the flange; 3 is the ball base surface; 4 is the end face; 10 is the baseline where the center of the ball base surface is located; 61 is the theoretical contact point design position; 62 is the theoretical contact point position after the flange is offset by 5' in the prior art; 63 is the theoretical contact point position after the flange is offset by 5' in the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] Example 1

[0021] Method for improving the design of the ball base surface of the inner ring flange of cylindrical roller bearings: Step 1: Determine the rolling element diameter Dw and the inclination angle of the inner ring flange; Step 2: Determine the reference line of the center of the ball base surface based on the rolling element diameter Dw from Step 1; the reference line of the center of the ball base surface is located on the inner limiting surface of the inner ring flange, close to the outer circumferential surface of the inner ring flange; Step 3: Determine the radius of the ball base surface based on the rolling element diameter Dw from Step 1; Step 4: Calculate the theoretical position of the contact point between the ball base surface and the inner ring flange based on the rolling element diameter Dw from Step 1.

[0022] Furthermore, based on the rolling element diameter Dw from step one, the eccentricity Es is calculated using the formula to determine the baseline where the center of the sphere base surface is located; eccentricity Es = 0.25 * Dw.

[0023] Furthermore, the sphere base radius is determined by calculating the sphere base radius SR using the formula based on the rolling element diameter Dw from step one; sphere base radius SR = 12 * Dw.

[0024] Furthermore, based on the rolling element diameter Dw from step one, the theoretical contact point c on the sphere base surface is calculated using the formula; theoretical contact point c = 0.125 * Dw.

[0025] The location of the center of the sphere is determined based on the baseline where the center of the sphere is located, the radius of the sphere, and the theoretical location of the contact point.

[0026] Example 2

[0027] The design method for improving the inner ring flange ball bearing base surface of the cylindrical roller bearing is the same as in Example 1, wherein the rolling element diameter Dw=36mm.

[0028] Furthermore, based on the rolling element diameter Dw=36mm, the eccentricity Es is calculated using the formula to determine the baseline where the center of the ball base surface is located; eccentricity Es=0.25*Dw=9mm.

[0029] Furthermore, based on the rolling element diameter Dw=36mm, the sphere base radius SR is calculated using the formula to determine the sphere base radius; sphere base radius SR=12*Dw=432mm.

[0030] Furthermore, based on the rolling element diameter Dw=36mm, the theoretical contact point c of the ball base surface is calculated using the formula; theoretical contact point c=0.125*Dw=4.5mm.

[0031] The location of the center of the sphere is determined based on the baseline where the center of the sphere is located, the radius of the sphere, and the theoretical location of the contact point.

[0032] Furthermore, during the processing, the flange may have a deviation of ±5′. When the angle of inclination of the inner ring flange is 40′, the theoretical contact point position 62 after the flange is offset by 5′ in the prior art is close to the inner raceway; while the theoretical contact point position 63 after the flange is offset by 5′ in the present invention is not much different from the design position 61 of the theoretical contact point. Therefore, the technical solution described in this application can ensure that after the flange is offset within a certain angle, the change in the theoretical contact point position is significantly less than the change in the theoretical contact point position in the prior art.

[0033] Beneficial effects: When the flange angle deviates, the contact point between the rolling element ball base and the flange will deviate from the ideal position. In the optimized design, the eccentricity Es is calculated using a formula to determine the baseline of the ball base center, and the ball base radius and theoretical contact point c are calculated. A smaller ball base radius results in a smaller deviation in the contact point position, which can increase the machining allowance for the inner ring flange angle, reduce machining difficulty, improve yield and quality, and reduce the likelihood of elliptical breakage under heavy loads, resulting in better contact marks. Furthermore, with the advantage of continuously improving tolerance, the same design can be matched with various bearings, reducing product costs from the design stage while still achieving significant performance improvements.

Claims

1. A design method for the inner ring rib ball base surface of a cylindrical roller bearing, characterized by: Step 1: Determine the rolling element diameter Dw and the angle of the inner ring rib inclination; Step 2: Determine the ball base surface center reference line based on the rolling element diameter Dw of Step 1; the ball base surface center reference line is located on the inner side limit surface of the inner ring rib near the outer peripheral surface of the inner ring rib; in this step, calculate the eccentricity Es based on the rolling element diameter Dw of Step 1, Es = 0.25*Dw, and determine the ball base surface center reference line; Step 3: Determine the ball base surface radius based on the rolling element diameter Dw of Step 1; in this step, calculate the ball base surface radius SR based on the rolling element diameter Dw of Step 1, SR = 1 / 2*Dw, and determine the ball base surface radius; Step 4: Calculate the theoretical position of the contact point between the ball base surface and the inner ring rib based on the rolling element diameter Dw of Step 1; in this step, calculate the theoretical contact point c between the ball base surface and the inner ring rib based on the rolling element diameter Dw of Step 1, c = 0.125*Dw; Step 5: Determine the position of the ball base surface center based on the ball base surface center reference line, the ball base surface radius, and the theoretical position of the contact point.

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