Bearing device manufacturing method and bearing device

Abstract

To provide a bearing device in which a sensor unit is attached to a rolling bearing, which allows an easy press-in work of a holder of the sensor unit into a fixing ring of the rolling bearing, and which suppresses a deformation of the holder and the fixing ring.SOLUTION: When forming a holder of a sensor unit by press process, several samples are extracted from among holders composing one processed lot, and a radial dimension of a press-in surface of the sample is measured. After setting a representative dimension per lot (for example, an estimated maximum dimension and an estimated minimum dimension) of a holder based on the measures result, and a reference dimension and a dimensional tolerance of a radial dimension of the notch part is set such that an interference between the notch part of the outer ring as a fixing ring and a press-in surface of the holder is within a preset range with respect to the representative dimension per lot of the holder, the notch part of the outer ring for one lot is processed.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a manufacturing method for a bearing device in which a sensor unit is attached to a rolling bearing, and to a bearing device manufactured by this manufacturing method. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there is known a bearing device in which a sensor unit for detecting the condition of a rolling bearing is attached to the rolling bearing.

[0003] In such bearing devices, a sensor unit incorporating a sensor is generally fixed to the fixed raceway (hereinafter also referred to as the "fixed raceway") of the outer or inner ring of the rolling bearing, and power is supplied to the sensor unit from a generator provided between the fixed raceway (hereinafter also referred to as the "rotating raceway") of the outer or inner ring and the rotating raceway (hereinafter also referred to as the "rotating raceway") of the outer or inner ring.

[0004] For example, Patent Document 1 discloses a bearing device in which an extension part that protrudes annularly axially outward from the outer periphery of the outer ring is provided at one axial end of a deep groove ball bearing in which balls are arranged as rolling elements between an outer ring which is a fixed ring and an inner ring which is a rotating ring, and a sensor unit is provided on the inner periphery of the extension part, so that rotational speed, etc. can be detected by power supplied to the sensor unit from a generator provided between the outer ring and the inner ring.

[0005] In this bearing device, a ring-shaped holder with an L-shaped cross section (which also serves as a yoke component that constitutes the generator) to which the sensor of the sensor unit is attached is fitted and fixed onto the inner side of the extension of the outer ring (the ring-shaped cutout portion at one axial end). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2003-307435 A Summary of the Invention [Problem to be solved by the invention]

[0007] In a bearing device in which a sensor unit is attached to a rolling bearing as in Patent Document 1 above, the metal holder of the sensor unit is formed by pressing into an L-shaped cross section, i.e. a shape in which an engaging portion protrudes annularly in the axial direction from either the outer or inner circumference of an annular disc portion, and the engaging portion of the holder is often press-fitted into an annular cutout portion formed on the surface of the fixed ring facing the rotating ring.

[0008] Incidentally, when the sensor unit holder is formed by press working, the tolerances indicated on the production drawings are set relatively large (e.g., 0.2 mm) in consideration of wear of the press die. On the other hand, the notch of the fixing ring into which the holder is fitted and fixed is formed by cutting or grinding, so the tolerance can be relatively small (e.g., 0.03 mm or less).

[0009] The radial tolerance of the notch of the fixed ring is set based on the radial tolerance of the press-fit surface (outer or inner peripheral surface) of the fitting portion of the holder into the notch, but since the dimensional tolerance of the holder is large, when the fitting portion of the holder is actually pressed into the notch of the fixed ring, the interference between the notch and the press-fit surface of the fitting portion becomes large, which may make the press-fitting operation difficult. In that case, there is a concern that the peripheral portions of the notch of the holder and the fixed ring may be deformed.

[0010] Therefore, an object of this invention is to make it possible to easily press the sensor unit holder into the fixed ring of the rolling bearing in a bearing device in which a sensor unit is attached to a rolling bearing, and to suppress deformation of the holder and the fixed ring. [Means for solving the problem]

[0011] In order to solve the above problem, the inventors of the present invention have studied the variation in the interference between the press-fit surface of the sensor unit holder and the notch of the fixed ring, and have noticed that the radial dimension of the press-fit surface of the holder formed by press working varies greatly over the entire life of the press die used due to the progression of die wear, but the variation is quite small (the difference between the maximum and minimum values ​​is about 0.01 mm) within one lot of press working (e.g., 500 holders continuously processed with one die).Then, for holders whose press-fit surface is formed with small variation within one lot of press working, the inventors have come up with the idea that the interference between the notch of the fixed ring and the press-fit surface of the holder can be kept within an appropriate range by setting the reference dimension and dimensional tolerance of the radial dimension of the notch of the fixed ring based on the dimensional measurement results of the press-fit surface, and then processing the notch of the fixed ring for one lot.

[0012] Specifically, the present invention relates to a method for manufacturing a bearing device comprising: a rolling bearing having an outer ring, an inner ring arranged radially inside the outer ring, and a plurality of rolling elements arranged to be rollable between the outer ring and the inner ring; and a sensor unit fixed to a raceway of the outer ring and the inner ring which is a fixed side, the raceway of the fixed ring having an annular notch formed at one axial end of an opposing surface between the outer ring and the raceway of the inner ring which is a rotating side, the sensor unit having a holder to which a sensor is attached having an annular disc portion and a fitting portion protruding annularly in the axial direction from an outer circumferential portion or an inner circumferential portion of the disc portion, the fitting portion of the holder of the sensor unit being press-fitted into the notch of the raceway of the fixed side, When the holder of the sensor unit is formed by press processing, one or more samples are extracted from a plurality of holders constituting one lot in the press processing, and the radial dimensions of the press-fit surfaces of the outer and inner surfaces of the fitting portion of the sampled holder that fit into the notch of the fixed side raceway are measured. Then, a representative dimension for each lot is set based on the measurement results of the radial dimensions of the press-fit surfaces, and a reference dimension and dimensional tolerance for the radial dimensions of the notch of the fixed side raceway are set based on the representative dimension of the press-fit surfaces for each lot, and then the notch of the fixed side raceway is machined (Configuration 1).

[0013] According to the manufacturing method of the bearing device of this configuration 1, the interference between the notch of the fixed ring and the press-fit surface of the holder falls within an appropriate range, making it easier to press-fit the holder and suppressing deformation of the holder and fixed ring.

[0014] In the above configuration 1, the representative dimension of the press-fit surface of the holder for each lot can be determined by extracting multiple samples, and using an estimated maximum dimension obtained by adding a predetermined estimated error to the maximum value of the dimensional measurement results of the samples, and an estimated minimum dimension obtained by subtracting the estimated error from the minimum value of the dimensional measurement results of the samples, the reference dimension and dimensional tolerance of the radial dimension of the notch can be set so that the interference between the notch of the fixed side raceway ring and the press-fit surface of the holder falls within a predetermined range for both the estimated maximum dimension and the estimated minimum dimension of the press-fit surface (configuration 2).

[0015] Alternatively, the representative dimension of the press-fit surface of the holder for each lot can be determined by extracting a plurality of samples, calculating the average value and standard deviation of the dimensional measurement results of the samples, and using the estimated maximum dimension and estimated minimum dimension obtained by adding / subtracting an integer multiple of the standard deviation to / from the average value as an estimated error, and setting the reference dimension and dimensional tolerance of the radial dimension of the notch so that the interference between the notch of the fixed side raceway ring and the press-fit surface of the holder falls within a preset range for both the estimated maximum dimension and the estimated minimum dimension of the press-fit surface (configuration 3).

[0016] In any of the above configurations 1 to 3, the radial dimension of the press-fit surface of the holder is measured at multiple points in the axial direction, and if the press-fit surface is a tapered surface which becomes larger in diameter away from the disc portion, the notch portion of the fixed side raceway has a step halfway in the axial direction so as to expand radially on the axial outside, and the fitting portion of the holder is pressed in axially more inward than the step of the notch, and a representative dimension for each lot of the press-fit surface of the holder is set based on the dimensional measurement results of the portion of the fitting portion which is pressed in axially more inward than the step of the notch, and a reference dimension and dimensional tolerance of the radial dimension axially more inward than the step of the notch are set based on the representative dimension for each lot of the press-fit surface, and then the notch is machined (configuration 4).

[0017] The present invention also provides a bearing device manufactured by the above-mentioned manufacturing method, which has the following configuration: That is, a rolling bearing having an outer ring, an inner ring arranged radially inside the outer ring, and a plurality of rolling elements arranged to be rollable between the outer ring and the inner ring, and a sensor unit fixed to a raceway of the outer ring and the inner ring that is a fixed side, the raceway of the fixed side having an annular notch formed at one axial end of an opposing surface between the outer ring and the raceway of the inner ring that is a rotating side, the sensor unit having a holder to which a sensor is attached having an annular disc portion and a fitting portion protruding annularly in the axial direction from an outer circumferential portion or an inner circumferential portion of the disc portion, the fitting portion of the holder of the sensor unit being press-fitted into the notch of the raceway of the fixed side, When the holder for the sensor unit is formed by press working, one or more samples are extracted from a plurality of holders that constitute one lot in the press working, and the radial dimension of the press-fit surface of the outer and inner surfaces of the fitting portion of the sampled holder that is pressed into the notch of the fixed side raceway is measured. A representative dimension for each lot is then set based on the measurement results of the radial dimension of the press-fit surface, and a reference dimension and dimensional tolerance for the radial dimension of the notch of the fixed side raceway are set based on the representative dimension of the press-fit surface for each lot. The notch of the fixed side raceway is then machined, and the fitting portion of the holder is press-fitted into the notch, thereby providing a bearing device in which the interference between the notch and the press-fit surface of the holder is controlled. Effect of the Invention

[0018] As described above, in the manufacturing method of the bearing device of this invention, when the holder of the sensor unit of the bearing device is formed by press processing, a representative dimension for each lot is set based on the measurement results of the radial dimension of the press-fit surface of a sample extracted from a lot of holders, and based on the representative dimension of the press-fit surface for each lot, the reference dimension and dimensional tolerance of the radial dimension of the notch of the fixed ring into which the holder is pressed is set, and then the notch of the fixed ring is processed.This keeps the clamping clearance between the cutout of the fixed ring and the press-fit surface of the holder within an appropriate range, making it easier to press the holder into the fixed ring and suppressing deformation of the holder and fixed ring.

[0019] Furthermore, since the bearing device of the present invention is manufactured by the above-mentioned manufacturing method, there is little deformation of the holder and fixed ring, and the device can be used stably. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is an external perspective view of a bearing device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a longitudinal sectional front view of the main part of the bearing device shown in FIG. [Diagram 3] A cross-sectional view explaining the radial dimensions of the press-fit portion of the outer ring and holder in FIG. [Figure 4]An explanatory diagram of the procedure for setting the radial dimension of the cutout of the outer ring in Figure 1 [Diagram 5] An explanatory diagram of how to set the representative dimensions of the holder used in the setting procedure in Figure 4. [Figure 6] An explanatory diagram of another method for setting the representative dimensions of the holder used in the setting procedure of FIG. [Figure 7] FIG. 2 is a longitudinal sectional front view of a main part showing a modified example of the shape of the fitting portion of the holder shown in FIG. [Figure 8] FIG. 2 is a longitudinal sectional front view of a main part showing a modified example of the shape of the cutout portion of the outer ring of FIG. 1; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in Figures 1 and 2, a bearing device according to this embodiment has a sensor unit 20 and a generator 30 attached to one axial end of a rolling bearing 10.

[0022] In the following, the circumferential direction around the central axis of the rolling bearing 10 (bearing central axis) is referred to as the circumferential direction, the direction along the bearing central axis is referred to as the axial direction, and the direction perpendicular to the bearing central axis is referred to as the radial direction. One axial side is the right side in Fig. 2, and the other axial side is the left side in Fig. 2.

[0023] The rolling bearing 10 is a deep groove ball bearing comprising an outer ring 11 having a raceway groove 11a on its inner circumference, an inner ring 12 having a raceway groove 12a on its outer circumference, a plurality of balls 13 as rolling elements arranged to roll freely between the raceway groove 11a of the outer ring 11 and the raceway groove 12a of the inner ring 12, a retainer 14 that holds the plurality of balls 13 at equal intervals so that they can roll freely, and a sealing member 15 that seals the other axial side of the bearing space between the outer ring 11 and the inner ring 12, with the outer ring 11 being a fixed ring fixed to a housing or the like (not shown), and the inner ring 12 being a rotating ring attached to a rotating shaft (not shown) so as to rotate integrally with the rotating shaft.

[0024] Furthermore, annular cutout portions 16, 17 are formed at one axial end of the inner surface of the outer ring 11 and the outer surface of the inner ring 12 (the opposing surfaces of the outer ring 11 and the inner ring 12), and a sensor unit 20 and a generator 30 are arranged between the cutout portions 16, 17.

[0025] The sensor unit 20 has a holder 21 that forms part of the generator 30, as described below, a board 22 attached to the holder 21, a sensor 23 mounted on the board 22, and a cover 24 that covers the board 22 and the sensor 23.

[0026] The holder 21 is formed by pressing a single metal plate, and has an annular disk portion 21a expanding in the radial and circumferential directions, and a fitting portion 21b protruding annularly from the outer periphery of the disk portion 21a to one axial side. The fitting portion 21b is press-fitted into the notch portion 16 of the outer ring 11, thereby being fixed to the outer ring 11. That is, in this holder 21, the outer periphery of the fitting portion 21b forms a press-fit surface 25 for the notch portion 16 of the outer ring 11 (see FIG. 3).

[0027] The substrate 22 is formed in an arcuate plate shape, and is attached by screws or adhesive to one axial surface of the disk portion 21a of the holder 21. In addition to the sensor 23, a wireless communication module, a power supply circuit, and the like (not shown) are also mounted on this substrate 22.

[0028] The generator 30 is a claw-pole type consisting of a magnetic ring 31 arranged so as to be rotatable integrally with the inner ring 12 of the rolling bearing 10, and an annular stator 32 fixed to the outer ring 11 in a state facing the magnetic ring 31 radially with an air gap therebetween.

[0029] The magnetic ring 31 is a rotor that generates a rotating magnetic field for the stator 32, and is made by adhering magnets 31a made of magnetic rubber, which are magnetized with alternating north and south poles in the circumferential direction, to a core metal 31b over the entire circumference. The magnetic ring 31 is formed in a shape having a flange at one end of a cylindrical portion, and the other end side of the cylindrical portion is press-fitted or adhered to the outer periphery of the inner ring 12, thereby fixing it to the inner ring 12.

[0030] The stator 32 is a stator that guides the magnetic flux from the magnetic ring 31 with a yoke structure and induces an AC voltage in a coil 34 wound around a bobbin 33 in the yoke structure. The yoke structure is composed of a main stator 35 formed from the inner periphery of the holder 21 of the sensor unit 20, and a sub-stator 36 attached to the main stator 35. The main stator 35 and the sub-stator 36 are combined so that claw-shaped claw poles extending in the axial direction at regular intervals from their respective inner peripheries are alternately arranged in the circumferential direction. The cover 24 of the sensor unit 20 is fitted between the outer periphery of the sub-stator 36 and the inner periphery of the fitting portion 21b of the holder 21.

[0031] When the inner ring 12 of the rolling bearing 10 rotates integrally with the rotating shaft, an AC voltage is generated at both ends of the coil 34 in response to the rotation, and the generated AC power is supplied to the sensor unit 20.

[0032] The bearing device of this embodiment has the above-mentioned configuration, and the features of the manufacturing method thereof will be described below.

[0033] What makes this manufacturing method of a bearing device different from a conventional one is that after one lot of holders 21 of sensor units 20 are press-processed, the radial dimension of press-fit surface 25 of processed holder 21 (outer diameter D of fitting portion 21b in Figure 3) is taken into consideration to set the radial dimension of cutout portion 16 of outer ring 11 (inner diameter d of cutout portion 16 in Figure 3), and cutout portion 16 of outer ring 11 is processed in accordance with the set radial dimension.

[0034] Specifically, as shown in FIG. 4, first, when holder 21 is formed by press processing, several samples are extracted from holders 21 constituting one processed lot, and the radial dimension (outer diameter D) of press-fit surface (outer peripheral surface) 25 of fitting portion 21b of holder 21 selected as the samples is measured.

[0035] Here, the number of pieces in one lot of press processing of holders 21 can be, for example, about 500 pieces. Also, as samples of holders 21, for example, several pieces molded at the beginning, several pieces molded in the middle, and several pieces molded at the end of one lot can be selected, and the number of samples at each timing can be about 3. Note that the number of samples and the extraction timing are not limited to this, and for example, the extraction at the middle of one lot may be omitted, or the samples may be extracted at only one of the timings of the beginning, middle, and end.

[0036] Next, a representative dimension for each lot is set based on the measurement results of the sampled holders 21. Here, an example will be described in which three samples are taken at the beginning, middle, and end of a lot, and the representative dimension is set based on the measurement results.

[0037] A method for setting the representative dimensions for each lot is shown in Fig. 5. In Fig. 5, the tolerance of press-fit surface 25 of fitting portion 21b shown in the production drawing of holder 21 is the range between two dashed two-dot lines. Note that the tolerance of the radial dimension of press-fit surface 25 of fitting portion 21b is set only on the positive side of the reference dimension, so the minimum allowable dimension is equal to the reference dimension.

[0038] Then, the maximum value (maximum measured value) and the minimum value (minimum measured value) are extracted from the measured dimensions of nine samples of holder 21 pressed according to the production drawings, and the estimated maximum dimension obtained by adding a predetermined estimated error to the maximum measured value and the estimated minimum dimension obtained by subtracting the same estimated error from the minimum measured value are used as representative dimensions for each lot.

[0039] Here, the estimated error is set by conducting an experiment in advance to measure the dimensions of all parts in one lot, so that the measured values ​​of all parts fall between the estimated maximum dimension and the estimated minimum dimension.

[0040] After setting the representative dimension for each lot as described above, the reference dimension and dimensional tolerance of the radial dimension of the notch 16 are set so that the interference between the notch 16 of the outer ring 11 and the press-fit surface 25 of the holder 21 falls within a preset range for both the representative dimension for each lot, i.e., the estimated maximum dimension and estimated minimum dimension of the press-fit surface 25 (for example, the minimum interference is 0.02 mm and the maximum interference is 0.06 mm). Then, one lot of outer rings 11 are machined according to the set radial dimension of the notch 16.

[0041] Therefore, each time the press processing lot of holder 21 changes, the press-fit surface 25 of the sample is measured to set a representative dimension for each lot, and the radial dimension of cutout portion 16 of outer ring 11 is set based on that, and then cutout portion 16 of outer ring 11 is processed.

[0042] In the manufacturing method of the bearing device of the embodiment described above, when the holder 21 of the sensor unit 20 is pressed, the radial dimension of the press-fit surface 25 is formed with small variation within one lot, and a representative dimension for each lot is set based on the dimensional measurement results of the press-fit surface 25 of a sample within one lot, and the radial dimension of the notch 16 of the outer ring 11 is set based on the representative dimension of the press-fit surface 25 before machining the outer ring 11. This makes it possible to keep the interference between the notch 16 of the outer ring 11 and the press-fit surface 25 of the holder 21 within an appropriate range more reliably than when the notch of the outer ring is machined according to the radial dimensions (reference dimensions and dimensional tolerances) described in the production drawings. As a result, the press-fitting of the holder 21 into the outer ring 11 is facilitated, and deformation of the holder 21 and the outer ring 11 is suppressed.

[0043] Therefore, in a bearing device set that is an assembly of bearing devices manufactured by this manufacturing method, when bearing devices manufactured using one lot of holder 21 are considered as one product lot, it is possible to make the range of radial dimensions of press-fit surface 25 of holder 21 different for at least two product lots, and to make the interference between notch 16 of outer ring 11 and press-fit surface 25 of holder 21 for all bearing devices fall within a predetermined range common to each product lot. In other words, even if the radial dimensions of notch 16 of outer ring 11 and press-fit surface 25 of holder 21 differ for each bearing device that constitutes this bearing device set, there is little deformation of holder 21 and outer ring 11, and the bearing devices can be used stably.

[0044] FIG. 6 illustrates another example of a method for setting the representative dimension for each lot when press-forming the holder 21. In the example of FIG. 6, as in the example of FIG. 5, the average value (measurement average value) and standard deviation (measurement standard deviation) are calculated for the measurement results of nine samples extracted from one lot, and the estimated maximum dimension is calculated by adding an integer multiple of the measurement standard deviation to the measurement average value as an estimated error, and the estimated minimum dimension is calculated by subtracting the same estimated error from the measurement average value. In this case, if the radial dimension of the holder 21 in one lot is normally distributed, the radial dimension of each holder 21 in one lot will fall between the estimated maximum dimension and the estimated minimum dimension with a probability of 99.73% by setting the estimated error three times the measurement standard deviation. In addition, the setting and processing of the radial dimension of the cutout portion 16 of the outer ring 11 after setting the representative dimension for each lot using this method can be performed in the same manner as in the case of using the example of FIG. 5.

[0045] In the above embodiment, the fitting portion 21b of the holder 21 extends parallel to the axial direction, but the shape of the holder 21 may be such that the fitting portion 21b opens on one axial side and the press-fit surface 25 is a tapered surface as shown in Fig. 7 by providing a draft angle to the press die. In this case, the radial dimension varies depending on the axial position of the fitting portion 21b, so it is necessary to determine a method for measuring the sample in advance.

[0046] For example, in the holder 21 of FIG. 7, if three points (P1, P2, P3) in the axial direction of the fitting portion 21b are considered to be the measurement objects, the measurement value at the position P1 closest to the disc portion 21a can be used as the measurement result, or the average value of the measurement values ​​at the three points can be used as the measurement result.

[0047] In addition, when the fitting portion 21b of the holder 21 is open on one axial side as shown in FIG. 7, the notch portion 16 of the outer ring 11 may be formed with a step as shown in FIG. 8 in order to shorten the fitting length between the notch portion 16 of the outer ring 11 and the holder 21. The notch portion 16 of the outer ring 11 shown in FIG. 8 has a step formed in the middle of the axial direction so as to expand radially on the axial outer side, and the fitting portion 21b of the holder 21 is press-fitted axially inside the step. Therefore, the representative dimension of the press-fit surface 25 of the holder 21 for each lot in this case may be set based on the dimensional measurement results of the portion of the fitting portion 21b that is press-fitted axially inside the step of the notch portion 16 (for example, the position P1 in FIG. 7). In this way, the holder 21 can be press-fitted into the outer ring 11 with an appropriate interference.

[0048] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0049] For example, the holder of the sensor unit in the embodiment is fitted and fixed to the outer ring, which is a fixed ring, with the fitting portion facing axially outward, but conversely, the holder may be fitted and fixed to the outer ring with the fitting portion facing axially inward.

[0050] In the embodiment, the outer ring of the rolling bearing is the fixed ring and the inner ring is the rotating ring, but the inner ring can be the fixed ring and the outer ring can be the rotating ring. In this case, the holder of the sensor unit is fitted and fixed in a notch formed in the shaft end of the inner ring, and the press-fit surface of the holder becomes the inner peripheral surface of the fitting portion.

[0051] Of course, the present invention can also be applied to a bearing device in which a sensor unit is attached to a rolling bearing other than a deep groove ball bearing as in the embodiment. [Explanation of symbols]

[0052] 10 Deep groove ball bearing (rolling bearing) 11 Outer ring (fixed ring) 12 Inner wheel (rotating wheel) 13 Ball (rolling element) 16 Notch 20 Sensor unit 21 Holder 21a Disc section 21b Fitting part 23 Sensors 25 Press-fit surface 30 Generator

Claims

1. A rolling bearing (10) having an outer ring (11), an inner ring (12) disposed radially inside the outer ring, and a plurality of rolling elements (13) disposed between the outer ring (11) and the inner ring (12) so as to be freely rollable; a sensor unit (20) fixed to a fixed race of the outer race (11) and the inner race (12), The fixed-side raceway ring has an annular notch (16) formed at one axial end of a facing surface between the outer ring (11) and the rotating-side raceway ring of the inner ring (12), The sensor unit (20) includes a holder (21) to which a sensor (23) is attached, the holder (21) having an annular disk portion (21a) and a fitting portion (21b) protruding annularly in the axial direction from an outer circumferential portion or an inner circumferential portion of the disk portion (21a), In the method for manufacturing a bearing device, a fitting portion (21b) of a holder (21) of the sensor unit (20) is press-fitted into a notch portion (16) of the fixed-side raceway ring, When the holder (21) of the sensor unit (20) is molded by press working, Extracting one or more samples from a plurality of holders (21) constituting one lot in the press working; The radial dimension of the press-fit surface (25) of the fixed-side raceway ring in the outer peripheral surface and the inner peripheral surface of the fitting portion (21b) of the holder (21) sampled is measured, and then A representative dimension for each lot is set based on the measurement results of the radial dimension of the press-fit surface (25); Based on a typical dimension of the press-fit surface (25) for each lot, a reference dimension and a dimensional tolerance of a radial dimension of the notch portion (16) of the fixed side raceway are set, The method for manufacturing a bearing device is characterized in that the notch (16) of the fixed side race is then machined.

2. The representative dimension of the press-fit surface (25) of the holder (21) for each lot is calculated by extracting a plurality of samples, and using an estimated maximum dimension obtained by adding a predetermined estimated error to the maximum value of the dimensional measurement results of the samples, and an estimated minimum dimension obtained by subtracting the estimated error from the minimum value of the dimensional measurement results of the samples, 2. A method for manufacturing a bearing device as described in claim 1, wherein the reference dimension and dimensional tolerance of the radial dimension of the notch (16) are set so that the interference between the notch portion (16) of the fixed side raceway ring and the press-fit surface (25) of the holder (21) is within a predetermined range with respect to both the estimated maximum dimension and the estimated minimum dimension of the press-fit surface (25).

3. The representative dimension of the press-fit surface (25) of the holder (21) for each lot is calculated by extracting a plurality of samples, calculating the average value and standard deviation of the dimensional measurement results of the samples, and using the estimated maximum dimension and estimated minimum dimension obtained by adding / subtracting an integer multiple of the standard deviation to / from the average value as an estimated error, 2. A method for manufacturing a bearing device as described in claim 1, wherein the reference dimension and dimensional tolerance of the radial dimension of the notch (16) are set so that the interference between the notch portion (16) of the fixed side raceway ring and the press-fit surface (25) of the holder (21) is within a predetermined range with respect to both the estimated maximum dimension and the estimated minimum dimension of the press-fit surface (25).

4. When the radial dimension of the press-fit surface (25) of the holder (21) is measured at multiple points in the axial direction, and the press-fit surface (25) is a tapered surface whose diameter increases with increasing distance from the disk portion (21a), the notch portion (16) of the fixed side raceway has a step in the axial direction so as to expand radially on the axially outer side, and the fitting portion (21b) of the holder (21) is press-fitted axially inside the step of the notch portion (16), a representative dimension of the press-fit surface (25) of the holder (21) for each lot is set based on a dimensional measurement result of a portion of the fitting portion (21b) that is press-fitted axially inwardly of a step of the notch portion (16); 4. A method for manufacturing a bearing device as claimed in any one of claims 1 to 3, wherein a reference dimension and a dimensional tolerance of a radial dimension axially inward from a step of the cutout portion (16) are set based on a typical dimension of the press-fit surface (25) for each lot, and then the cutout portion (16) is machined.

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