Assembly method for rolling bearings and quality control system for rolling bearings

Abstract

This invention provides a rolling bearing assembly method and a rolling bearing quality control system that reduce variations in bearing performance by minimizing variations in internal bearing clearance using an economically superior method without requiring high-precision manufacturing of bearing components. [Solution] In the method for assembling rolling bearings, the inner diameter of the inner ring, the outer diameter of the outer ring, and the internal clearance of the rolling bearing (combining the inner ring, outer ring, and rolling elements) are measured. The difference in inner diameter between the measured inner ring and the target inner diameter is determined, and the difference in outer diameter between the measured outer ring and the target outer diameter is determined. The amount of reduction in the internal clearance caused by the difference in inner and outer diameters is determined, and the estimated internal clearance is calculated by subtracting this reduction from the measured internal clearance. This estimated internal clearance is used to generate clearance information linked to the measured rolling bearing, and the inner ring is assembled to the shaft, or the outer ring to the housing, based on the clearance information.

Description

[Technical Field]

[0001] This invention relates to a method for assembling rolling bearings and a quality control system for rolling bearings. [Background technology]

[0002] The internal clearance of a rolling bearing during operation significantly affects key product performance characteristics such as lifespan, torque, and rigidity. Therefore, the smaller the variation in internal clearance during operation, the smaller the variation in rolling bearing performance. As a technology to suppress variation in internal clearance, for example, Patent Document 1 describes a mounting method for a wheel bearing device that suppresses variation in internal clearance after it has been attached to the vehicle body. This method makes it possible to narrow the allowable range of internal clearance when the bearing is assembled to the vehicle body. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2019-158012 [Overview of the project] [Problems that the invention aims to solve]

[0004] However, if the allowable range of internal bearing clearance is reduced beyond a certain point, the dimensions of the bearing components, especially the inner ring, outer ring, and rolling elements, must be strictly controlled, increasing the difficulty of the manufacturing process and leading to higher manufacturing costs.

[0005] Furthermore, if there is an interference fit between the inner ring and the shaft into which it is fitted, or between the outer ring and the housing supporting the outer ring, this interference fit causes the raceway rings (inner and outer rings) to expand or contract radially, changing the internal clearance after the rolling bearing is installed in a mechanical product. For example, if there is an interference fit between the inner ring and the shaft, both variations in the inner diameter of the inner ring and variations in the outer diameter of the shaft (the position where the inner ring fits) have an effect, so generally the variation in the bearing's internal clearance is greater during installation than during manufacturing. On the other hand, the variation in the bearing's internal clearance during installation and during operation is due to thermal deformation (expansion) of the parts and expansion due to centrifugal force of the rotating parts (shaft and inner ring in typical inner ring rotation applications), and the variation in the bearing's internal clearance during both periods is almost the same.

[0006] Incidentally, in the general manufacturing process of bearings, there is no manufacturing coordination between the inner ring raceway diameter and inner diameter, or between the outer ring's outer diameter and raceway diameter; the quality of each is not linked in any way. In other words, in rolling bearings mass-produced continuously using the same manufacturing process, the internal clearance of the bearing and the inner ring diameter and outer ring diameter will be randomly combined. Furthermore, the outer diameter of the shaft and the inner diameter of the housing's support hole are generally machined independently of the dimensional tolerances of the rolling bearing, and there is no correlation in their quality. That is, the internal clearance of the bearing, the inner ring diameter, the outer ring diameter, the shaft diameter, and the inner diameter of the housing's support hole all have variations, and these are combined randomly. As a result, the variation in the internal clearance of the bearing after assembly into a machine product becomes large.

[0007] Therefore, the present invention aims to provide a rolling bearing assembly method and a rolling bearing quality control system that can reduce variations in bearing internal clearance and thereby reduce variations in bearing performance by using an economically superior method without having to manufacture the bearing components of the rolling bearing with high precision. [Means for solving the problem]

[0008] This invention consists of the following configuration. (1) A method for assembling a rolling bearing comprising an inner ring and an outer ring manufactured according to target dimensions, and a plurality of rolling elements disposed between the inner ring and the outer ring, The inner diameter of the inner ring, the outer diameter of the outer ring, and the internal clearance of the rolling bearing, which is a combination of the inner ring, the outer ring, and the rolling elements, are measured. The difference in inner diameter between the measured inner diameter of the inner ring and the target inner diameter is determined. The difference in outer diameter between the measured outer diameter of the outer ring and the target outer diameter is determined. The amount of reduction in the internal clearance of the bearing caused by the difference in inner diameter and the difference in outer diameter is determined. The estimated internal clearance is obtained by subtracting the reduction amount from the measured internal clearance of the bearing. The aforementioned assumed internal clearance is used to generate clearance information linked to the measured rolling bearing, Based on the clearance information, the inner ring is assembled to the shaft body, or the outer ring is assembled to the housing. How to assemble rolling bearings. (2) A quality control system for a rolling bearing comprising an inner ring and an outer ring manufactured according to target dimensions, and a plurality of rolling elements disposed between the inner ring and the outer ring, A dimension information collection unit measures the inner diameter of the inner ring, the outer diameter of the outer ring, and the internal clearance of the rolling bearing formed by combining the inner ring, the outer ring, and the rolling elements, and determines the difference in inner diameter between the measured inner diameter of the inner ring and the target dimension of the inner diameter, and the difference in outer diameter between the measured outer diameter of the outer ring and the target dimension of the outer diameter. A clearance information generation unit calculates the amount of reduction in the bearing internal clearance caused by the difference in inner diameter and the difference in outer diameter, calculates an estimated internal clearance by subtracting the amount of reduction from the measured bearing internal clearance, and generates clearance information linked to the measured rolling bearing using the estimated internal clearance. An information display unit that displays the aforementioned gap information at any time, A quality control system for rolling bearings equipped with [specific features / features]. [Effects of the Invention]

[0009] According to the present invention, without manufacturing the bearing parts of a rolling bearing with high precision, it is possible to reduce the variation in the bearing clearance economically and thus reduce the variation in bearing performance.

Brief Description of the Drawings

[0010] [Figure 1] FIG. 1 is a schematic diagram schematically showing the configuration of a quality control system for a rolling bearing. [Figure 2] FIG. 2 is an explanatory diagram showing a rolling bearing to be managed and its respective part dimensions. [Figure 3] FIG. 3 is a process explanatory diagram showing the production process of a rolling bearing and the procedure of the use process of a bearing user. [Figure 4] FIG. 4 is an explanatory diagram showing the change in the range of the bearing clearance of a general rolling bearing. [Figure 5] FIG. 5 is an explanatory diagram showing the change in the range of the bearing clearance of a high-precision rolling bearing. [Figure 6] FIG. 6 is a graph showing the distribution of the bearing clearance when a rolling bearing is assembled into a machine without using the information of the assumed internal clearance. [Figure 7] FIG. 7 is a graph showing the distribution of the bearing clearance when a rolling bearing is assembled into a machine using the information of the assumed internal clearance. [Figure 8] FIG. 8 is a graph showing the relationship between the outer diameter difference of a shaft body and the reduction amount of the bearing clearance. [Figure 9] FIG. 9 is an explanatory diagram showing the change in the range of the bearing clearance of grouped normal rolling bearings.

Modes for Carrying Out the Invention

[0011] Embodiments of the present invention will now be described in detail with reference to the drawings. In the rolling bearing assembly method of this embodiment, in a rolling bearing in which an interference fit is provided to at least one of the inner ring and outer ring for use (installation), information on the internal clearance of the bearing after the rolling bearing has been deformed by the interference fit is presented as information on the internal clearance of the bearing of the product, and based on this clearance information, the inner ring is assembled to the shaft and the outer ring to the housing.

[0012] In other words, the system provides bearing users with information on a "deemed internal clearance" that corrects for the amount of change in the bearing's internal clearance caused by the expansion and contraction of the inner and outer rings due to deviations from the target dimensions (design value, nominal value) of the inner and outer ring diameters. This allows bearing users to adjust the combination of the outer diameter of the shaft body that is fitted into the inner ring and the inner diameter of the support hole that supports the outer ring, which are the sides to which the rolling bearing is assembled, according to the presented deemed internal clearance. As a result, variations in the bearing's internal clearance after the rolling bearing is assembled into the machine are suppressed, thereby enabling the construction of a rolling bearing quality management system that can suppress variations in bearing performance.

[0013] Figure 1 is a schematic diagram illustrating the configuration of a rolling bearing quality control system. Figure 2 is an explanatory diagram showing the rolling bearing 11 to be controlled and the dimensions of its various parts. The rolling bearing quality control system 100 shown here (hereinafter referred to as the "quality control system") controls the quality of a rolling bearing 11, which comprises an inner ring 13 and an outer ring 15 manufactured according to predetermined target dimensions (design value, nominal value), and a plurality of rolling elements 17 arranged between the inner ring 13 and the outer ring 15, as shown in Figure 2. Note that each of the plurality of rolling elements 17 may be held in a cage 19.

[0014] The quality control system 100 shown in Figure 1 comprises an information collection unit 21, a gap information generation unit 23, and an information presentation unit 25. Details of each unit will be described later, but in general terms, they are as follows. The information collection unit 21 collects dimensional information of each part of the rolling bearing 11. Specifically, it collects the inner diameter d of the inner ring 13 shown in Figure 2. b And the outer diameter D of the outer ring 15 bAnd, the bearing clearance δ inside the rolling bearing 11, which is a combination of the inner ring 13, the outer ring 15, and the rolling elements 17, is measured respectively, and the inner diameter d of the measured inner ring 13 b and the target dimension d of the inner diameter d b of the inner diameter difference Δd b_t from the target dimension d b (= d b - d b_t ), and the outer diameter D of the measured outer ring 15 b and the target dimension D of the outer diameter D b of the outer diameter difference ΔD b_t from the target dimension D b (= D b - D b_t ) and other information are collected.

[0015] The clearance information generation unit 23 calculates the reduction amount of the bearing clearance δ inside the rolling bearing 11 when the rolling bearing 11 is assembled to the machine, based on the inner diameter difference Δd of the inner ring 13 b and the outer diameter difference ΔD of the outer ring 15 b . Then, the assumed internal clearance δ is obtained by subtracting the calculated reduction amount from the measured bearing clearance δ inside the bearing. And the generated assumed internal clearance δ m is used to generate the clearance information associated with the measured rolling bearing 11. This clearance information may be registered in the database DB associated with the identification information unique to the measured rolling bearing 11. m

[0016] The information presentation unit 25 has a function to present the generated clearance information at any time. When the database DB is prepared, the database DB is searched based on the identification information such as the unique number, ID, etc. of the rolling bearing 11, and the clearance information corresponding to the rolling bearing 11 associated with the identification information is presented.

[0017] ​The information collection unit 21, gap information generation unit 23, information presentation unit 25, and database DB described above may include a computer, although not shown in the diagram, which may include, for example, an input / output unit, a storage unit, and a calculation unit. Various types of information, such as the dimensional measurements and target dimensions described above, are input to the input / output unit. The storage unit stores information such as a program that executes the procedure for presenting gap information and a database DB. This storage unit consists of memory such as ROM or RAM, or storage such as a hard disk or SSD (Solid State Drive). The calculation unit generates the gap information to be presented by executing the program and outputs it to the information presentation unit 25.

[0018] Gap information can be displayed, for example, by directly marking any part of the rolling bearing 11 with printing, engraving, or other means. Alternatively, the gap information can be recorded on an IC tag that allows for contactless recording and reading of information, and this IC tag can be attached to the rolling bearing 11, allowing the gap information to be read from the IC tag. Furthermore, the gap information can be recorded on a quality indicator such as a performance certificate that records the bearing's test results, which is included with the rolling bearing 11 when it is shipped, and the gap information can be confirmed from the quality indicator. In addition to directly recording and displaying the information itself, the gap information can also be displayed by recording and displaying the identification information of the rolling bearing 11, referring to the aforementioned database DB based on the read identification information, and extracting and displaying the corresponding gap information. Moreover, it is preferable to present the gap information for each of the multiple rolling bearings 11 in a form that is easy for the bearing user to recognize, for example, by presenting it in graph or table format.

[0019] Next, we will describe an example of applying the above-described quality control method for rolling bearings 11 throughout the process from production to product shipment and use by bearing users. Figure 3 is a process diagram illustrating the production process of a rolling bearing 11 and the steps involved in the bearing user's usage process. First, in the production process, bearing components such as inner rings and outer rings are manufactured (S1), and each bearing component is assembled (S2). Then, after inspecting the dimensions of the assembled rolling bearing (S3), the rolling bearing is shipped as a product (S4). During the manufacturing (S1), assembly (S2), and inspection (S3) of the bearing components described above, clearance information (deemed internal clearance) is generated (S5) from manufacturing information that includes at least the dimensions of the bearing components and the measured internal clearance of the bearing during, after, and after manufacturing, and this information is registered in the database DB.

[0020] When rolling bearings are shipped to a bearing user, the user installs the purchased rolling bearings into the desired machine for use. At this time, the bearing user obtains clearance information for the rolling bearings by reading the markings on the purchased rolling bearings, or quality indicators such as IC tags or performance certificates included with the bearings. Alternatively, they can obtain clearance information by referring to a database (DB) using identification information obtained by reading the markings or records.

[0021] Based on the inner diameter of the inner ring, the outer diameter of the outer ring, and the estimated internal clearance information obtained, the bearing user determines a combination of parts (shaft 31, housing 33) from the pre-prepared shaft 31 that fits into the inner ring 13 and the housing 33 that supports the outer ring 15, as shown in Figure 2, that minimizes deviation from the recommended internal clearance of the rolling bearing 11. In other words, based on the clearance information, the inner ring 13 is assembled onto the shaft 31, or the outer ring 15 is assembled onto the housing 33. In this way, the assembly target of the rolling bearing 11 is selected to be close to the recommended value of the internal clearance of the rolling bearing 11, according to the estimated internal clearance of the rolling bearing 11. This allows the bearing user to reduce the variation in the internal clearance of the rolling bearing 11 after assembly, thereby reducing the variation in the performance of the rolling bearing.

[0022] <Quality control simulation> Next, we will explain the results of the simulation conducted on the quality control method for rolling bearings described above. In this simulation, it is assumed that the rolling bearing is used in a "clearance fit" configuration, where there is an interference fit between the inner ring and the shaft that is fitted into the inner ring, but no interference fit between the outer ring and the housing that supports the outer ring. Furthermore, the variability of the bearing internal clearance, the difference in inner ring diameter dimensions (difference between measured value and target dimension (design value, nominal value)), and the difference in shaft outer diameter dimensions (difference between measured value and target dimension (design value, nominal value)) follows a normal distribution, and the tolerance range ("tolerance range") is set to 6 times the standard deviation σ (6σ). In addition, it is assumed that the combination of bearing components and bearing installation is randomly combined in terms of bearing internal clearance, inner ring diameter dimensions, and shaft outer diameter dimensions.

[0023] Figure 4 is an explanatory diagram illustrating the change in the range of internal clearance of a typical rolling bearing. Here, the internal clearances of a total of 300 rolling bearings with JIS Class 0 accuracy (JIS B 1514-1) are shown. The upper part of Figure 4 shows the tolerance range W1 of the internal clearance of the rolling bearing during manufacturing, the middle part shows the tolerance range W2 of the internal clearance when the rolling bearing is installed in a machine, and the lower part shows the tolerance range W3 of the internal clearance of the rolling bearing during operation. When a rolling bearing is installed in a machine, the inner diameter of the inner ring is expanded by the shaft and the outer diameter of the outer ring is reduced by the housing, changing the tolerance range from the original W1 to W2. Generally, the tolerance range tends to widen after installation. On the other hand, the tolerance range W2 at the time of installation and the tolerance range W3 at the time of operation are approximately the same width. This is because the changes during operation are mainly due to thermal deformation of the components (the shaft and inner ring, both of which deform) and expansion due to centrifugal force. Note that the values ​​shown in the following diagrams and graphs are merely examples and will vary depending on the type and size of the rolling bearing, and do not limit the present invention.

[0024] The tolerance range W2 after assembly was determined by simulation to be 17.4 μm (minimum: -4.7 μm, maximum: 12.7 μm).

[0025] On the other hand, when the aforementioned assumed internal clearance is presented to the bearing user, the bearing user can obtain information on the assumed internal clearance based on the inner ring diameter difference and outer ring diameter difference, in addition to the normal bearing internal clearance information, and thus adjust the bearing internal clearance after it is installed in the machine. Therefore, the factors that cause variations in the bearing internal clearance can be reduced. In this case, the tolerance range W2 after assembly was determined by simulation to be 13 μm (minimum: 6.5 μm, maximum: 19.5 μm).

[0026] Figure 5 is an explanatory diagram showing the change in the range of internal clearance of high-precision rolling bearings. Here, the internal clearance of a total of 300 rolling bearings with JIS Class 4 accuracy (JIS B 1514-1) is shown. In this case, the tolerance range W1 of the internal clearance of the bearing during manufacturing is narrower than that of a typical rolling bearing, and the tolerance range W2 of the internal clearance of the bearing during assembly was found to be approximately 11 μm through simulation.

[0027] Figure 6 is a graph showing the distribution of bearing internal clearance when rolling bearings are assembled into a machine without using information on assumed internal clearance. Figure 7 is a graph showing the distribution of bearing internal clearance when rolling bearings are assembled into a machine using information on assumed internal clearance. Comparing Figure 6 and Figure 7, it can be seen that even though the internal clearance at the time of manufacture is almost the same, the variation in bearing internal clearance is smaller when using the information on assumed internal clearance in Figure 7.

[0028] Based on the above, this rolling bearing management method allows bearing users to adjust the installation location of rolling bearings using information on the assumed internal clearance, thereby reducing variations in the internal clearance of bearings after installation in a machine. In other words, this management method can bring the results close to those of using high-precision rolling bearings with small variations in internal clearance. As a result, even when using rolling bearings of general precision without using expensive high-precision rolling bearings, variations in the internal clearance of bearings can be suppressed, and consequently, variations in bearing performance can be reduced.

[0029] In this way, bearing users can predict the internal clearance of the bearing after it has been installed in the machine more accurately than before. By understanding the dimensional accuracy of individual parts such as shafts and housings provided by the bearing user and matching them with rolling bearings, it becomes possible to set the recommended internal clearance of the bearing with reduced variation.

[0030] Figure 8 is a graph showing the relationship between the difference in the outer diameter of the shaft and the decrease in the internal clearance of the bearing. By providing bearing users with information such as the graph shown in Figure 8, which represents the relationship between the decrease in the internal clearance of the bearing and the change in the outer diameter ds of the shaft 31 (Figure 2), bearing users can more easily predict the internal clearance of the bearing after assembly into the machine compared to conventional methods. Similarly, although not shown in the figure, providing bearing users with information on the relationship between the decrease in the internal clearance of the bearing and the change in the inner diameter Dw of the bearing support hole 33a of the housing 33 (Figure 2) will also make it easier to predict the internal clearance of the bearing.

[0031] Alternatively, instead of presenting the information in the graph above, it is acceptable to provide an automated calculation system that can obtain that information. This automated calculation system could include, for example, a program running on a computer or an application running on a mobile device such as a smartphone, which uses computation to obtain the above information.

[0032] Furthermore, bearing users are provided with measured values ​​for the internal clearance δ of each bearing, the inner ring diameter difference Δdb, and the outer ring diameter difference ΔDb. In addition, information on the reduction in internal clearance due to shaft interference (as shown in graphs like Figure 8, with shaft interference on the vertical axis) and information on the reduction in internal clearance due to housing interference (as shown in graphs like Figure 8, with housing interference on the vertical axis) are also provided. By understanding the individual shaft diameter ds and housing inner diameter Dw, bearing users can accurately predict the internal clearance of each bearing after it is installed in a machine product. Moreover, by matching the shaft, housing, and bearing, the variation in internal clearance after the bearing is installed in a machine product can be reduced.

[0033] Conventionally, bearing users would calculate the amount of interference fit and then calculate the internal clearance of the bearing after it was installed in the machine product from the internal clearance of the bearing and the reduction in internal clearance due to the interference fit. However, in this management method, a value that includes the internal clearance of each bearing, the difference in inner ring diameter, and the difference in outer ring diameter is provided to the bearing user as a deemed internal clearance. This eliminates the need for bearing users to calculate the interference fit, and they can easily check the reduction in internal clearance from the shaft diameter ds and housing inner diameter Dw that they have confirmed. As a result, the process of checking the internal clearance of the bearing after it has been installed in the machine product can be streamlined.

[0034] <Other Embodiments> Next, we will explain a method for managing rolling bearings that allows bearing users to further suppress variations in bearing internal clearance by utilizing the provided estimated internal clearance information. Multiple rolling bearings presented to bearing users are classified into multiple groups based on the size of their assumed internal clearance. Furthermore, multiple shafts 31 attached to the inner ring 13 of the rolling bearing 11 shown in Figure 2 are classified into multiple groups based on the difference in outer diameter between their outer diameter ds (diameter of the outer surface contacting the inner diameter surface of the inner ring) and the target dimension (design value, nominal value). For example, multiple rolling bearings 11 are classified into three groups: group BG1 with the smallest assumed internal clearance, group BG2 with a medium clearance, and group BG3 with the largest clearance. Similarly, multiple shafts 31 are classified into three groups: group SG1 with the smallest outer diameter difference, group SG2 with a medium difference, and group SG3 with the largest difference.

[0035] Then, the group of rolling bearings 11 and the group of shaft bodies 31 are combined as follows, according to the relative magnitudes of the assumed internal clearance and the difference in outer diameter. Group 1: Group BG1 and Group SG1 Group 2: Group BG2 and Group SG2 Group 3: Group BG3 and Group SG3

[0036] As described above, each group is classified into multiple subgroups, and by combining the rolling bearing 11 and the shaft body 31 in combinations of these subgroups, variations in the internal clearance of the bearing after assembly can be suppressed for each subgroup.

[0037] Figure 9 is an explanatory diagram showing the change in the range of internal clearance of grouped conventional rolling bearings 11. Here, the internal clearance of the bearings during manufacturing, assembly into the machine, and operation is shown for a total of 300 rolling bearings 11 with the same JIS Class 0 accuracy (JIS B 1514-1) as shown in Figure 4.

[0038] Table 1 shows the deemed internal clearance for each group of rolling bearings, the clearance reduction due to the shaft diameter of the shaft body, and the maximum and minimum values ​​of the internal clearance of the bearings after assembly to the shaft body.

[0039] [Table 1]

[0040] In this case, as shown in Figure 4, the tolerance range W1 for the entire 300 units during manufacturing is approximately 15 μm. However, simulations of the tolerance range W2 during assembly revealed that even with the BG2·SG2 combination, which showed the greatest variation, the tolerance range was 10.9 μm (minimum: -1.2 μm, maximum: 9.7 μm). The tolerance range W3 during operation was approximately equal to the tolerance range W2 during assembly.

[0041] In this way, by classifying rolling bearings into multiple groups, variations can be further reduced than the tolerance range W2 (13 μm) obtained when adjusting the combination with the shaft 31 (Figure 2) according to the assumed internal clearance shown in Figure 4. The above describes the combination of the assumed internal clearance and the outer diameter ds of the shaft 31, but it is not limited to this. If there is an interference fit between the outer ring 15 and the bearing support hole of the housing 33, the combination with the inner diameter Dw of the bearing support hole of the housing 33 may be adjusted, or the combination of both the shaft 31 and the housing 33 may be adjusted.

[0042] Thus, the present invention is not limited to the embodiments described above. It is also intended and within the scope of protection to be provided for the combination of each configuration of the embodiments, as well as for modifications and applications by those skilled in the art based on the description in the specification and well-known technology.

[0043] As described above, the following matters are disclosed in this specification: (1) A method for assembling a rolling bearing comprising an inner ring and an outer ring manufactured according to target dimensions, and a plurality of rolling elements disposed between the inner ring and the outer ring, The inner diameter of the inner ring, the outer diameter of the outer ring, and the internal clearance of the rolling bearing, which is a combination of the inner ring, the outer ring, and the rolling elements, are measured. The difference in inner diameter between the measured inner diameter of the inner ring and the target inner diameter is determined. The difference in outer diameter between the measured outer diameter of the outer ring and the target outer diameter is determined. The amount of reduction in the internal clearance of the bearing caused by the difference in inner diameter and the difference in outer diameter is determined. The estimated internal clearance is obtained by subtracting the reduction amount from the measured internal clearance of the bearing. The aforementioned assumed internal clearance is used to generate clearance information linked to the measured rolling bearing, Based on the clearance information, the inner ring is assembled to the shaft body, or the outer ring is assembled to the housing. How to assemble rolling bearings. According to this method of assembling rolling bearings, by combining the rolling bearings with their respective mounting points based on the provided clearance information, variations in the internal clearance of the rolling bearings after assembly can be reduced, thereby reducing variations in bearing performance.

[0044] (2) The gap information is, The method for assembling a rolling bearing according to (1), further comprising information on the amount of change in the internal clearance of the bearing caused by the difference between the outer diameter of the shaft body fitted into the inner ring and the target dimension of the outer diameter of the shaft, and the amount of change in the internal clearance of the bearing caused by the difference between the diameter of the support hole of the support body that supports the outer ring and the target dimension of the diameter of the support hole. This method of assembling rolling bearings allows for adjustment of the combination with the shaft and support, thereby reducing variations in the internal clearance of the rolling bearing after assembly.

[0045] (3) The assembly method for a rolling bearing according to (1) or (2), wherein the clearance information is presented by at least one of the following: displaying it on the actual rolling bearing, recording it on an IC tag that allows for contactless recording and reading of information, or recording it on a quality label included with the rolling bearing when the rolling bearing is shipped as a product. This method of assembling rolling bearings allows bearing users to obtain clearance information corresponding to the rolling bearings in a format that is easy to use.

[0046] (4) A method for assembling a rolling bearing according to any one of (1) to (3), wherein the clearance information is registered in a database linked to the unique identification information of the measured rolling bearing. According to this method of assembling rolling bearings, clearance information for the rolling bearings can be easily obtained by referring to a database.

[0047] (5) A method for assembling rolling bearings according to any one of (1) to (3), wherein the clearance information for each of the multiple rolling bearings is presented in graph or table form. This method of assembling rolling bearings allows bearing users to easily verify information about the estimated internal clearance.

[0048] (6) A quality control system for a rolling bearing comprising an inner ring and an outer ring manufactured according to target dimensions, and a plurality of rolling elements disposed between the inner ring and the outer ring, A dimension information collection unit measures the inner diameter of the inner ring, the outer diameter of the outer ring, and the internal clearance of the rolling bearing formed by combining the inner ring, the outer ring, and the rolling elements, and determines the difference in inner diameter between the measured inner diameter of the inner ring and the target dimension of the inner diameter, and the difference in outer diameter between the measured outer diameter of the outer ring and the target dimension of the outer diameter. A clearance information generation unit calculates the amount of reduction in the bearing internal clearance caused by the difference in inner diameter and the difference in outer diameter, calculates an estimated internal clearance by subtracting the amount of reduction from the measured bearing internal clearance, and generates clearance information linked to the measured rolling bearing using the estimated internal clearance. An information display unit that displays the aforementioned gap information at any time, A quality control system for rolling bearings equipped with [specific features / features]. According to this rolling bearing quality control system, variations in the internal clearance of the rolling bearing after assembly can be reduced by adjusting the combination with the shaft and support.

[0049] (7) The gap information generation unit registers the gap information in a database, linking it to the unique identification information of the measured rolling bearing. The rolling bearing quality control system according to (6), wherein the information presentation unit presents the clearance information of the desired rolling bearing by referring to the database. According to this rolling bearing quality control system, clearance information for rolling bearings can be easily obtained by referring to the database. [Explanation of Symbols]

[0050] 11 bearings 13 Inner circle 15 Outer ring 17 Rolling element 19 Cage 21 Information Gathering Department 23 Information generation section 25 Information presentation section 31 Axis 33 Housing 33a Bearing support hole 100 Quality Management Systems

Claims

1. A method for assembling a rolling bearing comprising an inner ring and an outer ring manufactured according to target dimensions, and a plurality of rolling elements disposed between the inner ring and the outer ring, The inner diameter of the inner ring, the outer diameter of the outer ring, and the internal clearance of the rolling bearing, which is a combination of the inner ring, the outer ring, and the rolling elements, are measured. The difference in inner diameter between the measured inner diameter of the inner ring and the target inner diameter is determined. The difference in outer diameter between the measured outer diameter of the outer ring and the target outer diameter is determined. The amount of reduction in the internal clearance of the bearing caused by the difference in inner diameter and the difference in outer diameter is determined. The estimated internal clearance is obtained by subtracting the reduction amount from the measured internal clearance of the bearing. The aforementioned assumed internal clearance is used to generate clearance information linked to the measured rolling bearing, Based on the clearance information, the inner ring is assembled to the shaft body, or the outer ring is assembled to the housing. How to assemble rolling bearings.

2. The aforementioned gap information is, The information further includes the amount of change in the internal clearance of the bearing caused by the difference between the outer diameter of the shaft body fitted into the inner ring and the target dimension of the outer diameter of the shaft, and the amount of change in the internal clearance of the bearing caused by the difference between the diameter of the support hole of the support body that supports the outer ring and the target dimension of the support hole. The method for assembling a rolling bearing according to claim 1.

3. The aforementioned gap information is presented by at least one of the following means: displaying it on the actual rolling bearing, recording it on an IC tag that allows for contactless recording and reading of the information, or recording it on a quality label included with the rolling bearing at the time of product shipment. A method for assembling a rolling bearing according to claim 1 or 2.

4. The aforementioned clearance information is registered in a database, linked to the unique identification information of the measured rolling bearing. A method for assembling a rolling bearing according to claim 1 or 2.

5. The clearance information for each of the multiple rolling bearings is presented in graph or table format. A method for assembling a rolling bearing according to claim 1 or 2.

6. A quality control system for a rolling bearing comprising an inner ring and an outer ring manufactured according to their respective target dimensions, and a plurality of rolling elements disposed between the inner ring and the outer ring, A dimension information collection unit measures the inner diameter of the inner ring, the outer diameter of the outer ring, and the internal clearance of the rolling bearing formed by combining the inner ring, the outer ring, and the rolling elements, and determines the difference in inner diameter between the measured inner diameter of the inner ring and the target dimension of the inner diameter, and the difference in outer diameter between the measured outer diameter of the outer ring and the target dimension of the outer diameter. A clearance information generation unit calculates the amount of reduction in the bearing internal clearance caused by the difference in inner diameter and the difference in outer diameter, calculates an estimated internal clearance by subtracting the amount of reduction from the measured bearing internal clearance, and generates clearance information linked to the measured rolling bearing using the estimated internal clearance. An information display unit that displays the aforementioned gap information at any time, A quality control system for rolling bearings equipped with [specific features / features].

7. The gap information generation unit registers the gap information in a database, linking it to the unique identification information of the measured rolling bearing. The information display unit displays the desired clearance information for the rolling bearing by referring to the database. The rolling bearing quality control system according to claim 6.

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