Method for checking rotational torque of bearing device for wheel and rotational torque checking device for bearing device for wheel

Abstract

Provided is a rotation torque checking method for a wheel bearing device that can easily detect abnormalities in components or processes that occur during the manufacture of a wheel bearing device, thereby reducing the number of discarded components. The rotation torque checking method for a wheel bearing device (1) includes: a press-in process (S02) in which an inner ring (4) is pressed in the axial direction to a position at which the inner ring (4) comes into contact with a hub ring (3) with respect to a small-diameter stepped portion (3a) of the hub ring (3); a post-press-in rotation torque measurement process (S04) in which the rotation torque (T1) of the wheel bearing device (1) is measured when the hub ring (3) and the inner ring (4) as inner members are caused to relatively rotate with an outer ring (2) as an outer member after the press-in process (S02); and a post-press-in rotation torque determination process (S05) in which it is determined whether the rotation torque (T1) is appropriate based on whether the rotation torque (T1) measured in the post-press-in rotation torque measurement process (S04) is within a range of a reference value (S1).

Description

TECHNICAL FIELD

[0001] The present application relates to a rotational torque checking method of a wheel bearing device and a rotational torque checking device of a wheel bearing device. BACKGROUND

[0002] Conventionally, a wheel bearing device that rotatably supports a wheel in a suspension device of a vehicle or the like is known. In such a wheel bearing device, a pre-load is applied to a space between a rolling element and a raceway ring that constitute the wheel bearing device.

[0003] By applying a pre-load to the wheel bearing device, it is possible to increase the rigidity of the wheel bearing device while suppressing vibration and noise. However, if the pre-load is applied too much, it can become a cause of an increase in rotational torque and a decrease in life, and therefore it is preferable to confirm whether or not an appropriate pre-load is applied to the wheel bearing device. In particular, in recent years, in a vehicle or the like in which the wheel bearing device is installed, low fuel consumption is being promoted, and therefore the demand for management of rotational torque associated with the pre-load of the wheel bearing device is increasing.

[0004] As a method of confirming the pre-load applied to the wheel bearing device, as disclosed in, for example, Patent Literature 1, a pre-load measuring method is known in which, in a rolling bearing in which rolling elements are arranged in a double row, a pre-load applied to the bearing is measured by measuring a pre-load gap in the axial direction.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Laid-Open No. 10-185717 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] In the pre-load measuring method disclosed in Patent Literature 1, it is possible to measure the pre-load applied to the bearing, but since it is determined whether or not the pre-load is appropriate in the finished state of the bearing, in the case where an abnormality occurs in the assembly of the bearing or the like in the middle of the manufacturing process of the bearing, it is difficult to verify which component or which process caused the abnormality to occur. In addition, in the case where an abnormality is found in the finished bearing, it is necessary to discard the bearing in addition to the component that caused the abnormality to occur, and there is a waste.

[0010] Therefore, an object of the present application is to provide a rotational torque checking method of a wheel bearing device and a rotational torque checking device of a wheel bearing device that can easily detect an abnormality of a component or a process that occurs in the middle of the manufacturing of a wheel bearing device, and thereby can reduce discarded components.

[0011] MEANS FOR SOLVING THE PROBLEMS

[0012] That is, for the rotational torque checking method of the wheel bearing device, the wheel bearing device is provided with: an outer member having double-row outer track surfaces on an inner periphery; an inner member including a hub ring having a small-diameter stepped portion extending in an axial direction on an outer periphery, and an inner ring press-fitted into the small-diameter stepped portion of the hub ring, and having double-row inner track surfaces opposed to the double-row outer track surfaces; and double-row rolling elements housed between the two track surfaces of the outer member and the inner member in a free-rolling manner, wherein the rotational torque checking method of the wheel bearing device is provided with: a press-fitting step of press-fitting the inner ring in the axial direction to a position at which the inner ring and the hub ring are in abutment with respect to the small-diameter stepped portion of the hub ring; a post-press-fitting rotational torque measuring step of measuring a post-press-fitting rotational torque of the wheel bearing device when the inner member and the outer member are relatively rotated after the press-fitting step; and a post-press-fitting rotational torque determining step of determining whether the post-press-fitting rotational torque is appropriate or not based on whether the post-press-fitting rotational torque measured in the post-press-fitting rotational torque measuring step is within a range of a reference value.

[0013] In addition, for the rotational torque checking method of the wheel bearing device, the wheel bearing device is provided with: an outer member having double-row outer track surfaces on an inner periphery; an inner member including a hub ring having a small-diameter stepped portion extending in an axial direction on an outer periphery, and an inner ring press-fitted into the small-diameter stepped portion of the hub ring, and having double-row inner track surfaces opposed to the double-row outer track surfaces; and double-row rolling elements housed between the two track surfaces of the outer member and the inner member in a free-rolling manner, wherein the rotational torque checking method of the wheel bearing device is provided with: a riveting step of riveting an inner side end portion of the small-diameter stepped portion into which the inner ring is press-fitted to the inner ring; a post-riveting rotational torque measuring step of measuring a post-riveting rotational torque of the wheel bearing device when the inner member and the outer member are relatively rotated after the riveting step; and a post-riveting rotational torque determining step of determining whether the post-riveting rotational torque is appropriate or not based on whether the post-riveting rotational torque measured in the post-riveting rotational torque measuring step is within a range of a reference value.

[0014] Further, in the rotation torque checking device for a wheel bearing device, the wheel bearing device includes an outer member having double-row outer track surfaces on an inner periphery, an inner member including a hub ring having a small-diameter stepped portion extending in an axial direction on an outer periphery, and an inner ring press-fitted into the small-diameter stepped portion of the hub ring, and having double-row inner track surfaces opposed to the double-row outer track surfaces, and double-row rolling elements housed between the two track surfaces of the outer member and the inner member in a free-rolling manner, wherein the rotation torque checking device for the wheel bearing device is capable of performing: a press-fitting process of press-fitting the inner ring into the small-diameter stepped portion of the hub ring in the axial direction to a position at which the inner ring and the hub ring are in abutment; a post-press-fitting rotation torque measuring process of measuring a post-press-fitting rotation torque of the wheel bearing device when the inner member and the outer member are relatively rotated after the press-fitting process; and a post-press-fitting rotation torque determining process of determining whether the post-press-fitting rotation torque is appropriate or not based on whether the post-press-fitting rotation torque measured in the post-press-fitting rotation torque measuring process is within a reference range or not.

[0015] Further, in the rotation torque checking device for a wheel bearing device, the wheel bearing device includes an outer member having double-row outer track surfaces on an inner periphery, an inner member including a hub ring having a small-diameter stepped portion extending in an axial direction on an outer periphery, and an inner ring press-fitted into the small-diameter stepped portion of the hub ring, and having double-row inner track surfaces opposed to the double-row outer track surfaces, and double-row rolling elements housed between the two track surfaces of the outer member and the inner member in a free-rolling manner, wherein the rotation torque checking device for the wheel bearing device is capable of performing: a press-fitting process of press-fitting the inner ring into the small-diameter stepped portion of the hub ring in the axial direction to a position at which the inner ring and the hub ring are in abutment; a post-press-fitting rotation torque measuring process of measuring a post-press-fitting rotation torque of the wheel bearing device when the inner member and the outer member are relatively rotated after the press-fitting process; and a post-press-fitting rotation torque determining process of determining whether the post-press-fitting rotation torque is appropriate or not based on whether the post-press-fitting rotation torque measured in the post-press-fitting rotation torque measuring process is within a reference range or not.

[0016] Effects of Invention

[0017] As the effects of the present application, the following effects are exhibited.

[0018] That is, according to the present application, it is possible to easily detect abnormalities of parts or processes generated in the middle of manufacturing of a wheel bearing device, and thus it is possible to reduce discarded parts. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1is a side sectional view showing a first embodiment of a bearing device for wheel in which a rotation torque checking method is implemented.

[0020] Figure 2 is a diagram showing a flow of the rotation torque checking method of the first embodiment.

[0021] Figure 3 is a side sectional view showing the bearing device for wheel of the first embodiment in a state after the inner ring is temporarily pressed into the small diameter stepped portion of the hub ring.

[0022] Figure 4 is a side sectional view showing the bearing device for wheel of the first embodiment in a state after the inner ring is pressed into the small diameter stepped portion of the hub ring.

[0023] Figure 5 is a diagram showing a relationship between time and torque when the hub ring is relatively rotated with the outer ring.

[0024] Figure 6 is a diagram showing a relationship between rotational speed and torque when the hub ring is relatively rotated with the outer ring.

[0025] Figure 7 is a side sectional view showing the bearing device for wheel of the first embodiment in a state after the small diameter stepped portion of the hub ring is riveted to the inner ring.

[0026] Figure 8 is a side sectional view showing the bearing device for wheel of the first embodiment in a state after the inner side sealing member is fitted to the inner side end portion of the outer ring.

[0027] Figure 9 is a side sectional view showing a second embodiment of a bearing device for wheel in which a rotation torque checking method is implemented.

[0028] Figure 10 is a diagram showing a flow of the rotation torque checking method of the second embodiment.

[0029] Figure 11 is a side sectional view showing the bearing device for wheel of the second embodiment in a state after the inner ring is temporarily pressed into the small diameter stepped portion of the hub ring.

[0030] Figure 12 is a side sectional view showing the bearing device for wheel of the second embodiment in a state after the inner ring is pressed into the small diameter stepped portion of the hub ring.

[0031] Figure 13 is a side sectional view showing the bearing device for wheel of the second embodiment in a state after the inner side sealing member is fitted to the inner side end portion of the outer ring. DETAILED DESCRIPTION

[0032] [First embodiment of bearing device for wheel]

[0033] Hereinafter, a first embodiment of a bearing device for wheel, i.e., a bearing device for wheel 1, which implements the rotational torque checking method of the present application, will be described. Figure 1 A first embodiment of a bearing device for wheel, i.e., a bearing device for wheel 1, which implements the rotational torque checking method of the present application, will be described.

[0034] Figure 1 The bearing device for wheel 1 illustrated in the drawing supports a driven wheel to be rotatable in a suspension device of a vehicle such as an automobile. The bearing device for wheel 1 has a structure called the third generation, and has an outer ring 2 as an outer member, a hub ring 3 and an inner ring 4 as inner members, double-row inner-side and outer-side ball rows 5 and 6 as rolling rows, and inner-side and outer-side seal members 9 and 10. Here, the inner side indicates the vehicle body side of the bearing device for wheel 1 when mounted to a vehicle body, and the outer side indicates the wheel side of the bearing device for wheel 1 when mounted to a vehicle body. In addition, the axial direction indicates the direction along the rotational axis of the bearing device for wheel 1.

[0035] An inner-side opening portion 2a, into which the inner-side seal member 9 is fitted, is formed at the inner-side end portion of the outer ring 2. An outer-side opening portion 2b, into which the outer-side seal member 10 is fitted, is formed at the outer-side end portion of the outer ring 2. An outer-side track surface 2c on the inner side and an outer-side track surface 2d on the outer side are formed on the inner peripheral surface of the outer ring 2. A vehicle body mounting flange 2e for mounting the outer ring 2 to a vehicle body side member is integrally formed on the outer peripheral surface of the outer ring 2. A bolt hole 2g, into which a fastening link member (a bolt in this case) for fastening and linking the vehicle body side member and the outer ring 2 is inserted, is provided in the vehicle body mounting flange 2e.

[0036] A small-diameter stepped portion 3a, which has a smaller diameter than the outer-side end portion, is formed on the outer peripheral surface at the inner-side end portion of the hub ring 3. The small-diameter stepped portion 3a extends in the axial direction, and a shoulder portion 3e is formed at the outer-side end portion of the small-diameter stepped portion 3a in the hub ring 3. A wheel mounting flange 3b for mounting a wheel is integrally formed at the outer-side end portion of the hub ring 3. A bolt hole 3f, into which a hub bolt for fastening and linking the hub ring 3 and a wheel or a brake member is press-fitted, is provided in the wheel mounting flange 3b.

[0037] The hub ring 3 is provided with an inner-side track surface 3c on the outer side in such a manner as to oppose the outer-side track surface 2d on the outer side of the outer ring 2. A lip sliding surface 3d, with which the outer-side seal member 10 is in sliding contact, is formed at the base side of the wheel mounting flange 3b in the hub ring 3. The outer-side seal member 10 is fitted to the outer-side opening end of the annular space formed by the outer ring 2 and the hub ring 3. The hub ring 3 has an outer-side end surface 3g at the end portion on the outer side of the wheel mounting flange 3b.

[0038] An inner ring 4 is provided to the small-diameter stepped portion 3a of the hub ring 3. The inner ring 4 is fixed to the small-diameter stepped portion 3a of the hub ring 3 by press-fitting and riveting. The inner ring 4 imparts a preload to the inner-side ball row 5 and the outer-side ball row 6, which are rolling rows. The inner ring 4 has an inner-side end face 4b at the inner-side end portion and an outer-side end face 4c at the outer-side end portion. A riveting portion 3h that is riveted to the inner-side end face 4b of the inner ring 4 is formed at the inner-side end portion of the hub ring 3.

[0039] An inner-side raceway surface 4a is formed on the outer peripheral surface of the inner ring 4 on the inner-side of the hub ring 3. The inner-side raceway surface 4a opposes the outer-side raceway surface 2c on the inner-side of the outer ring 2.

[0040] The inner-side ball row 5 and the outer-side ball row 6, which are rolling rows, are constituted by a plurality of balls 7, which are rolling elements, being held by the retainer 8. The inner-side ball row 5 is interposed between the inner-side raceway surface 4a of the inner ring 4 and the outer-side raceway surface 2c on the inner-side of the outer ring 2 in a manner that allows rolling. The outer-side ball row 6 is interposed between the inner-side raceway surface 3c of the hub ring 3 and the outer-side raceway surface 2d on the outer-side of the outer ring 2 in a manner that allows rolling.

[0041] In the wheel bearing apparatus 1, a double-row angular contact ball bearing is constituted by the outer ring 2, the hub ring 3, and the inner ring 4, the inner-side ball row 5, and the outer-side ball row 6. Note that the wheel bearing apparatus 1 can also be constituted by a double-row tapered roller bearing.

[0042] [First Embodiment of Rotational Torque Inspection Method]

[0043] Next, a first embodiment of the rotational torque inspection method of the present application, i.e., a rotational torque inspection method for a wheel bearing apparatus 1, will be described. As shown in FIG. 1, the rotational torque inspection method in this embodiment is mainly implemented halfway through the assembly of the wheel bearing apparatus 1. Specifically, the rotational torque inspection method has a temporary press-fitting process (S01), a press-fitting process (S02), a close-fitting process (S03), a post-press-fitting rotational torque measurement process (S04), a post-press-fitting rotational torque determination process (S05), a riveting process (S06), a post-riveting rotational torque measurement process (S07), a post-riveting rotational torque determination process (S08), an inner-side seal member assembly process (S09), a post-seal-member-assembly rotational torque measurement process (S10), and a post-seal-member-assembly rotational torque determination process (S11). Each process of the rotational torque inspection method will be described below. Figure 2

[0044] (Temporary Press-Fitting Process)

[0045] As shown in FIG. 1, the temporary press-fitting process is a process in which the inner ring 4 is temporarily press-fitted to the small-diameter stepped portion 3a of the hub ring 3. The temporary press-fitting process is performed before the inner-side seal member 10 is assembled to the inner ring 4. The temporary press-fitting process is performed in order to confirm that the inner ring 4 is properly press-fitted to the small-diameter stepped portion 3a of the hub ring 3. The temporary press-fitting process is performed in order to confirm that the inner-side seal member 10 is properly assembled to the inner ring 4. Figure 3 ​As shown, the hub ring 3 is placed on the support platform 11 with its axial direction perpendicular and its outer side end face 3g facing downwards. The outer side end face 3g of the hub ring 3 contacts the support platform 11. An outer ring 2 is mounted on the hub ring 3 placed on the support platform 11 in a manner that allows it to rotate via the inner side ball bearing row 5 and the outer side ball bearing row 6. An outer side sealing member 10 is fitted into the outer side end of the outer ring 2. Grease is filled between the hub ring 3 and the outer ring 2.

[0046] In the temporary pressing process (S01), the inner ring 4 is first temporarily pressed into the small-diameter stepped portion 3a of the hub ring 3, which is placed on the support platform 11. The temporary pressing of the inner ring 4 is performed as follows: the inner ring 4 is pressed into the small-diameter stepped portion 3a from above, and the pressing is stopped when the outer side end face 4c of the inner ring 4 is about to abut against the shoulder 3e of the hub ring 3. Here, the pressing operation of the inner ring 4 is performed, for example, by using a pushing device 13 such as a hydraulic cylinder or a pneumatic cylinder, under a specified pressure. That is, the pushing device 13 is configured to press the inner ring 4 into the small-diameter stepped portion 3a, and the temporary pressing process (S01) can be performed using the pushing device 13. At the point when the temporary pressing of the inner ring 4 is completed, there is an axial positive clearance Ga between the outer side end face 4c of the inner ring 4 and the shoulder 3e of the hub ring 3.

[0047] (Pressing process)

[0048] The pressing process (S02) is performed after the temporary pressing process (S01). For example... Figure 4 As shown, in the pressing process (S02), the inner ring 4 is pressed into the small-diameter stepped portion 3a until the outer side end face 4c of the inner ring 4 abuts against the shoulder 3e of the hub ring 3. Here, the pressing operation of the inner ring 4 is performed under a specified pressure, for example, using a pushing device 13 such as a hydraulic cylinder or a pneumatic cylinder. That is, the pressing process (S02) can be performed using the pushing device 13. After the inner ring 4 is pressed into the small-diameter stepped portion 3a in the pressing process (S02), axial negative clearances are generated between the inner side ball bearing 5 and the inner side outer ring track surface 2c and the inner ring track surface 4a, and between the outer side ball bearing 6 and the outer side outer ring track surface 2d and the hub ring track surface 3c.

[0049] (Sealing process)

[0050] The adhesion process (S03) is performed after the press-in process (S02). In the adhesion process (S03), the grease filled between the hub ring 3 into which the inner ring 4 is pressed and the outer ring 2 is caused to adhere to the balls 7 of the inner side ball row 5 and the outer side ball row 6 by relatively rotating the hub ring 3 and the outer ring 2. In the adhesion process (S03), the outer ring 2 can be fixed in advance and the hub ring 3 can be rotated, or the hub ring 3 can be fixed in advance and the outer ring 2 can be rotated. In the adhesion process (S03), for example, the support table 11 is rotated by driving the support table 11 using the drive source 14, so that the hub ring 3 and the outer ring 2 can be relatively rotated. That is, the drive source 14 can relatively rotate the hub ring 3 and the outer ring 2, so that the adhesion process (S03) can be performed using the drive source 14.

[0051] By performing the adhesion process (S03), the resistance generated between the grease and the balls 7 can be made constant when the hub ring 3 and the outer ring 2 are relatively rotated. Thus, when the rotational torque of the wheel bearing device 1 is measured in the post-press-in rotational torque measurement process (S04), the post-riveting rotational torque measurement process (S07), and the post-seal member assembly rotational torque measurement process (S10) to be performed later, the occurrence of a deviation in the measured rotational torque can be suppressed.

[0052] From the viewpoint of making the resistance generated between the grease and the balls 7 constant, it is preferable to relatively rotate the hub ring 3 and the outer ring 2 by 30 rotations or more. By relatively rotating the hub ring 3 and the outer ring 2 by 30 rotations or more, the occurrence of a deviation in the measured rotational torque can be effectively suppressed.

[0053] (Post-press-in rotational torque measurement process)

[0054] The post-press-in rotational torque measurement process (S04) is performed after the adhesion process (S03). In the post-press-in rotational torque measurement process (S04), the rotational torque T1 when the hub ring 3 into which the inner ring 4 is pressed and the outer ring 2 are relatively rotated is measured by the torque measurer 12. In the post-press-in rotational torque measurement process (S04), for example, the hub ring 3 and the outer ring 2 can be relatively rotated by the drive source 14, so that the post-press-in rotational torque measurement process (S04) can be performed using the drive source 14 and the torque measurer 12. The rotational torque T1 is an example of a post-press-in rotational torque, and is a rotational torque measured after the press-in process (S02) and before the riveting process (S06). In the post-press-in rotational torque measurement process (S04), the outer ring 2 can be fixed in advance and the hub ring 3 can be rotated, or the hub ring 3 can be fixed in advance and the outer ring 2 can be rotated.

[0055] In the case where the hub ring 3 is rotated, the revolution speed of the balls 7 in the inner side ball row 5 and the outer side ball row 6 becomes slower compared to the case where the outer ring 2 is rotated, and the deviation of the rotation torque value measured when the rotation speed of the hub ring 3 is changed becomes small, so in the rotation torque measurement process, it is preferable to rotate the hub ring 3. Note that in the case where the hub ring 3 is rotated, the hub ring 3 can be rotated by rotating the support table 11 on which the hub ring 3 is placed.

[0056] In addition, in the post-pressing rotation torque measurement process (S04), the rotation torque is measured, not the starting torque of the bearing. As shown in FIG. 6, the starting torque is the peak value of the initial torque at the time when the bearing starts to rotate, but it decreases with the passage of time and changes greatly over time. Thus, it lacks reproducibility. In contrast, the rotation torque is the torque after the bearing starts to rotate and hardly changes over time to show a constant value. Therefore, in the post-pressing rotation torque measurement process (S04), by measuring the rotation torque T1, the torque value of the bearing can be measured with high accuracy. Figure 5 As shown in FIG. 6, for the rotation torque of the bearing when the hub ring 3 and the outer ring 2 are relatively rotated, it increases with an increase in the rotation speed in a range where the rotation speed of the hub ring 3 or the outer ring 2 is a constant value or more, but it decreases with an increase in the rotation speed when the rotation speed of the hub ring 3 or the outer ring 2 is extremely low and changes to increase thereafter. That is, there is a region in which the rotation torque of the bearing changes from decrease to increase with an increase in the rotation speed, and in this region, the degree of variation of the change in the rotation torque with respect to the rotation speed is small.

[0057] Figure 6 In the post-pressing rotation torque measurement process (S04), the hub ring 3 or the outer ring 2 is rotated at a constant rotation speed so that the measured rotation torque does not deviate. In addition, the rotation speed of the hub ring 3 or the outer ring 2 is set to a range of the rotation speed N1 to N2 in the region in which the rotation torque changes from decrease to increase. Thus, even if the rotation speed changes in the measurement of the rotation torque T1, the variation of the rotation torque can be reduced.

[0058] In the post-pressing rotation torque measurement process (S04), the rotation torque is measured in a state where dynamic friction occurs between the inner members 3, 4 and the outer member 2. Specifically, the measurement of the rotation torque is performed in a state where dynamic friction occurs between the inner members 3, 4 and the rolling elements 7, between the hub ring 3 and the outer side sealing member 10, and between the outer ring 2 and the rolling elements 7 and the outer side sealing member 10. Generally, the dynamic friction coefficient is smaller than the static friction coefficient and has a small deviation, so the rotation torque can be measured with high accuracy.

[0059] In the post-pressing rotation torque measurement process (S04), the rotation torque is measured in a state where dynamic friction occurs between the inner members 3, 4 and the outer member 2. Specifically, the measurement of the rotation torque is performed in a state where dynamic friction occurs between the inner members 3, 4 and the rolling elements 7, between the hub ring 3 and the outer side sealing member 10, and between the outer ring 2 and the rolling elements 7 and the outer side sealing member 10. Generally, the dynamic friction coefficient is smaller than the static friction coefficient and has a small deviation, so the rotation torque can be measured with high accuracy.

[0060] ​In the present embodiment, the rotational speed Nl, which is the lower limit value of the range of the rotational speed, is set to 10 rpm at which the measurement of the rotational torque can be performed in a state in which the dynamic friction is generated. The rotational speed N2, which is the upper limit value of the range of the rotational speed, is set to 30 rpm at which the stirring resistance of the lubricating grease filled between the hub ring 3 and the outer ring 2 is minimized. Thus, even if the rotational speed changes during the measurement of the rotational torque Tl, the variation of the rotational torque Tl can be reduced, and thus the rotational torque can be measured stably.

[0061] In the post-pressing rotational torque measurement process (S04), the hub ring 3 or the outer ring 2 is rotated in a range of the smaller rotational speed Nl to N2 at which the variation of the rotational torque with respect to the change in the rotational speed is small, and thus even if the rotational speed of the hub ring 3 or the outer ring 2 changes, the variation of the rotational torque can be suppressed to the minimum, and thus the rotational torque can be measured with high accuracy.

[0062] In addition, in the post-pressing rotational torque measurement process (S04), the rotational torque Tl of the wheel bearing apparatus 1 is measured in a state in which the outer-side opening end of the annular space formed by the outer ring 2 and the hub ring 3 is fitted with the outer-side sealing member 10. Here, the outer-side sealing member 10 is located on the side opposite to the small-diameter stepped portion 3a of the hub ring 3 that is riveted for fixing the inner ring 4 in the axial direction, and thus even if an abnormality occurs in the inner ring raceway surface 4a or the like in the riveting process (S06) described later, it is difficult for the sealing torque of the outer-side sealing member 10 to be affected, and the rotational torque of the wheel bearing apparatus 1 is less likely to change.

[0063] (Post-pressing rotational torque determination process)

[0064] The post-pressing rotational torque determination process (S05) is performed after the post-pressing rotational torque measurement process (S04). In the post-pressing rotational torque determination process (S05), it is determined whether the rotational torque Tl is appropriate or not based on whether the rotational torque Tl measured in the post-pressing rotational torque measurement process (S04) is within the range of the reference value S l. The reference value S l is an example of the reference value used when it is determined whether the post-pressing rotational torque is appropriate or not. In the post-pressing rotational torque determination process (S05), it is determined whether the rotational torque Tl is appropriate or not, for example, by the determination device 15 connected to the torque measurer 12. That is, the determination device 15 can determine whether the rotational torque Tl is appropriate or not, and thus the post-pressing rotational torque determination process (S05) can be performed using the determination device 15. In the post-pressing rotational torque determination process (S05), if the rotational torque Tl is within the range of the reference value S l, it is determined that the rotational torque Tl is appropriate, and if the rotational torque Tl exceeds the range of the reference value S l, it is determined that the rotational torque Tl is not appropriate. The reference value S l has a lower limit value and an upper limit value in a prescribed range, and can be set in advance.

[0065] In this way, by using the rotational torque T1 measured in the post-pressing rotational torque measurement process (S04), which is performed after the pressing process (S02) and before the riveting process (S06), it is possible to determine whether the rotational torque of the wheel bearing assembly 1 is appropriate. This allows for the detection of any abnormalities in components such as the outer side sealing member 10 and in processes such as the pressing process (S02) during the manufacturing process of the wheel bearing assembly 1. Therefore, compared to determining whether the rotational torque is appropriate after the wheel bearing assembly 1 is completed, it is easier to detect which component or process has an abnormality, thereby reducing the number of discarded components.

[0066] Furthermore, the rotational torque of the bearing when the hub ring 3 and the outer ring 2 rotate relative to each other varies due to deviations in various conditions, such as the size and hardness of the outer side sealing member 10, the fitting state relative to the outer ring 2 and the hub ring 3, the viscosity and application amount of the grease, and the temperature of the wheel bearing assembly 1 used to measure the rotational torque. Therefore, the reference value S1 can be set taking into account the deviations of the above conditions.

[0067] In particular, when the temperature of the wheel bearing assembly 1 changes, the measured value of the rotational torque varies considerably. Therefore, it is possible to determine whether the rotational torque T1 is appropriate by correcting the measured value of the rotational torque T1 based on the temperature of the wheel bearing assembly 1. In this way, by correcting the measured value of the rotational torque T1 based on the temperature of the wheel bearing assembly 1 to which the measured rotational torque T1 is measured, it is possible to determine whether the rotational torque T1 is appropriate with high precision.

[0068] (Riveting process)

[0069] After the pressing-in rotational torque determination process (S05), the riveting process (S06) is performed. In the riveting process (S06), as follows... Figure 7 As shown, a riveting process is performed to rivet the inner side end of the small-diameter stepped portion 3a in the wheel hub 3 to the inner side end face 4b of the inner ring 4. The riveting process can be performed, for example, by using a riveting tool such as a riveting die 16 for oscillating riveting. That is, the riveting die 16 can rivet the inner side end of the small-diameter stepped portion 3a to the inner ring 4 while the wheel hub 3 is rotated by the drive source 14, thus enabling the riveting process (S06) to be performed using the riveting die 16 and the drive source 14. By performing the riveting process (S06), a riveted portion 3h is formed at the inner side end of the wheel hub 3. After the riveting process (S06), an axial negative clearance is generated between the inner ring 4 and the wheel hub 3.

[0070] (Measurement of rotational torque after riveting)

[0071] The post-riveting rotation torque measurement process (S07) is performed after the riveting process (S06). In the post-riveting rotation torque measurement process (S07), the rotation torque is measured in the state where the dynamic friction is generated between the inner member 3, 4 and the outer member 2, as in the post-pressing rotation torque measurement process (S04). In the post-riveting rotation torque measurement process (S07), the rotation torque T2 when the hub ring 3, in which the small-diameter stepped portion 3a is riveted to the inner ring 4 by the driving source 14, and the outer ring 2 relatively rotate is measured by the torque measurer 12. Thus, the post-riveting rotation torque measurement process (S07) can be performed using the driving source 14 and the torque measurer 12. The rotation torque T2 is an example of the post-riveting rotation torque, and is the rotation torque measured after the riveting process (S06) and before the inner-side seal member assembly process (S09). In the post-riveting rotation torque measurement process (S07), the outer ring 2 can be fixed and the hub ring 3 can be rotated, or the hub ring 3 can be fixed and the outer ring 2 can be rotated.

[0072] However, as in the case of the post-pressing rotation torque measurement process (S04), since the rotation torque value measured when the rotation speed of the hub ring 3 changes has a small variation, it is preferable that the hub ring 3 be rotated. Also, in the post-riveting rotation torque measurement process (S07), as in the case of the post-pressing rotation torque measurement process (S04), the rotation torque, not the starting torque of the bearing, is measured, and the rotation torque T2 is measured while the hub ring 3 or the outer ring 2 is rotated at a constant rotation speed in the range of the low-speed rotation speeds N1 to N2, so that the rotation torque can be measured with high accuracy.

[0073] In this case, as in the case of the post-pressing rotation torque measurement process (S04), the rotation speed N1 can be set to 10 rotations / min and the rotation speed N2 can be set to 30 rotations / min. Thus, even if the rotation speed changes in the measurement of the rotation torque T2, the variation of the rotation torque T2 can be reduced, so that the rotation torque can be measured stably.

[0074] Also, in the post-riveting rotation torque measurement process (S07), the rotation torque T2 of the wheel bearing apparatus 1 is measured in the state where the outer-side seal member 10 is fitted to the outer-side opening end of the annular space formed by the outer ring 2 and the hub ring 3. However, the outer-side seal member 10 is located on the side axially opposite to the small-diameter stepped portion 3a of the hub ring 3 riveted for fixing the inner ring 4, so that even if an abnormality occurs in the inner ring raceway surface 4a or the like in the riveting process (S06) performed before the post-riveting rotation torque measurement process (S07), the sealing torque of the outer-side seal member 10 is less likely to be affected, and the rotation torque of the wheel bearing apparatus 1 is less likely to change.

[0075] In addition, the same process as the adhesion process (S03) can be performed between the riveting process (S06) and the post-riveting rotation torque measurement process (S07), that is, a process of making the lubricating grease filled between the hub ring 3 and the outer ring 2 adhere to the balls 7 of the inner-side ball row 5 and the outer-side ball row 6. As in the case of the adhesion process (S03), this adhesion process can be performed using the drive source 14. Thus, the resistance generated between the lubricating grease and the balls 7 when the hub ring 3 and the outer ring 2 are relatively rotated becomes constant, and thus it is possible to further suppress the occurrence of variations in the measured rotation torque T2 when the rotation torque T2 of the wheel bearing device 1 is measured in the post-riveting rotation torque measurement process (S07).

[0076] However, in the case where the lubricating grease and the balls 7 are sufficiently adhered by performing the adhesion process (S03) and the resistance generated between the lubricating grease and the balls 7 is constant, the adhesion process between the riveting process (S06) and the post-riveting rotation torque measurement process (S07) can be omitted.

[0077] (Post-riveting rotation torque determination process)

[0078] The post-riveting rotation torque determination process (S08) is performed after the post-riveting rotation torque measurement process (S07). In the post-riveting rotation torque determination process (S08), it is determined whether the rotation torque T2 is appropriate or not depending on whether the rotation torque T2 measured in the post-riveting rotation torque measurement process (S07) is within the range of the reference value S2. The reference value S2 is an example of a reference value used when it is determined whether the post-riveting rotation torque is appropriate. As in the case of the post-pressing rotation torque determination process (S05), the post-riveting rotation torque determination process (S08) can be performed using the determination device 15. In the post-riveting rotation torque determination process (S08), if the rotation torque T2 is within the range of the reference value S2, it is determined that the rotation torque T2 is appropriate, and if the rotation torque T2 exceeds the range of the reference value S2, it is determined that the rotation torque T2 is not appropriate. The reference value S2 has a lower limit value and an upper limit value in a prescribed range, and can be set in advance. The reference value S2 can be set to the same value as the reference value S1, or can be set to a different value from the reference value S1.

[0079] In this way, by using the rotational torque T2 measured in the post-riveting rotational torque measurement process (S07) performed after the riveting process (S06), it is possible to determine whether the rotational torque of the wheel bearing assembly 1 is appropriate. This allows for the detection of any abnormalities occurring in components such as the outer side sealing member 10 and in processes such as the riveting process (S06) during the manufacturing process of the wheel bearing assembly 1. Therefore, compared to determining whether the rotational torque is appropriate after the wheel bearing assembly 1 is completed, it is easier to detect abnormalities in components or processes occurring during the manufacturing of the wheel bearing assembly, thereby reducing the number of discarded components.

[0080] Furthermore, the rotational torque of the bearing when the hub ring 3 rotates relative to the outer ring 2 varies due to deviations in various conditions, such as the size and hardness of the outer side sealing member 10, the fitting state relative to the outer ring 2 and the hub ring 3, the viscosity and application amount of the grease, and the temperature of the wheel bearing assembly 1 used to measure the rotational torque. Therefore, the reference value S2 can be set taking into account the deviations of the above conditions.

[0081] In particular, when the temperature of the wheel bearing assembly 1 changes, the measured value of the rotational torque varies significantly. Therefore, it is possible to determine whether the rotational torque T2 is appropriate by correcting the measured value of the rotational torque T2 based on the temperature of the wheel bearing assembly 1. For example, when the small-diameter stepped portion 3a of the hub ring 3 is riveted to the inner side end face 4b of the inner ring 4 during the riveting process (S06), the temperature of the inner ring 4 rises, and the rotational torque of the wheel bearing assembly 1 increases. Therefore, it is possible to correct the measured value of the rotational torque T2 to a value corresponding to the amount of temperature rise. In this way, by correcting the measured value of the rotational torque T2 based on the temperature of the wheel bearing assembly 1 to which the measured rotational torque T2 is measured, it is possible to determine whether the rotational torque T2 is appropriate with high precision.

[0082] (Inner side sealing component assembly process)

[0083] After the riveting rotational torque determination process (S08), the inner side sealing component assembly process (S09) is performed. For example... Figure 8 As shown, in the inner side sealing member assembly step (S09), the inner side sealing member 9 is fitted into the inner side opening 2a of the outer ring 2, thereby assembling the inner side sealing member 9 between the inner side end of the outer ring 2 and the inner side end of the inner ring 4. In this case, for example, the inner side sealing member 9 can be assembled into the inner side opening 2a using a sealing member assembly tool (not shown). That is, the inner side sealing member assembly step (S09) can be performed using a sealing member assembly tool.

[0084] If the inner side seal member 9 is assembled before the riveting process (S06), the sliding resistance between the inner side seal member 9 and the outer ring 2 and the inner ring 4 can change due to the degree of riveting of the hub ring 3 in the riveting process (S06) or the like. Also, even after the riveting process (S06), if the inner side seal member 9 is assembled before the post-riveting rotation torque measurement process (S07), the sliding resistance between the inner side seal member 9 and the outer ring 2 and the inner ring 4 can change due to the assembly state of the inner side seal member 9.

[0085] Therefore, if the inner side seal member 9 is assembled before the riveting process (S06) or the post-riveting rotation torque measurement process (S07), the variation in the rotation torque T2 measured in the post-riveting rotation torque measurement process (S07) can be affected. Similarly, in the case where the inner side seal member 9 is assembled before the post-pressing rotation torque measurement process (S04), the variation in the rotation torque Tl measured in the post-pressing rotation torque measurement process (S04) can be affected due to the assembly state of the inner side seal member 9.

[0086] However, in the present embodiment, the inner side seal member assembly process (S09) is performed after the post-riveting rotation torque measurement process (S07), and therefore, when the rotation torque Tl and the rotation torque T2 of the wheel bearing apparatus 1 are measured in the post-pressing rotation torque measurement process (S04) and the post-riveting rotation torque measurement process (S07), the variation in the rotation torque caused by the influence of the inner side seal member 9 does not occur, and thus the rotation torque of the wheel bearing apparatus 1 can be measured with high accuracy.

[0087] (Post-assembly of seal member rotation torque measurement process)

[0088] The sealing member assembly post-rotation torque measurement process (S10) is implemented after the inner side sealing member assembly process (S09). In the sealing member assembly post-rotation torque measurement process (S10), as in the case of the press-in post-rotation torque measurement process (S04) and the riveting post-rotation torque measurement process (S07), the measurement of the rotation torque is performed in a state in which the dynamic friction is generated between the inner member 3, 4 and the outer member 2. In the sealing member assembly post-rotation torque measurement process (S10), the rotation torque T3 when the hub ring 3, in which the small diameter stepped portion 3a is riveted to the inner ring 4, and the outer ring 2 relatively rotate by the driving source 14 is measured by the torque measurer 12. In this way, the sealing member assembly post-rotation torque measurement process (S10) can be implemented using the driving source 14 and the torque measurer 12. The rotation torque T3 is the sealing member assembly post-rotation torque measured after the inner side sealing member assembly process (S09). In the sealing member assembly post-rotation torque measurement process (S10), the outer ring 2 can be fixed and the hub ring 3 can be rotated, or the hub ring 3 can be fixed and the outer ring 2 can be rotated.

[0089] However, as in the case of the press-in post-rotation torque measurement process (S04) and the riveting post-rotation torque measurement process (S07), since the deviation of the rotation torque value measured when the rotation speed of the hub ring 3 is changed is small, it is preferable that the hub ring 3 is rotated. In addition, in the sealing member assembly post-rotation torque measurement process (S10), as in the case of the press-in post-rotation torque measurement process (S04) and the riveting post-rotation torque measurement process (S07), the rotation torque, not the starting torque of the bearing, is measured, and the rotation torque T3 is measured while the hub ring 3 or the outer ring 2 is rotated at a constant rotation speed in the low-speed rotation speed N1 to N2 range, so that the rotation torque can be measured with high accuracy.

[0090] In addition, the same process as the tight fitting process (S03), that is, a tight fitting process of making the lubricating grease filled between the hub ring 3 and the outer ring 2 tight to the balls 7 of the inner side ball row 5 and the outer side ball row 6 can be implemented between the inner side sealing member assembly process (S09) and the sealing member assembly post-rotation torque measurement process (S10). As in the case of the tight fitting process (S03), this tight fitting process can be implemented using the driving source 14. Thus, the resistance generated between the lubricating grease and the balls 7 when the hub ring 3 and the outer ring 2 relatively rotate can be constant, so that the deviation in the measured rotation torque T3 can be further suppressed when the rotation torque T3 of the wheel bearing apparatus 1 is measured in the sealing member assembly post-rotation torque measurement process (S10).

[0091] However, in a case where the grease is sufficiently adhered to the balls 7 by the adhesion process (S03) and the resistance between the grease and the balls 7 is constant, the adhesion process between the inner-side seal member assembly process (S09) and the seal member assembly post-rotation torque measurement process (S10) can be omitted.

[0092] (seal member assembly post-rotation torque determination process)

[0093] The seal member assembly post-rotation torque determination process (S11) is performed after the seal member assembly post-rotation torque measurement process (S10). In the seal member assembly post-rotation torque determination process (S11), it is determined whether the rotation torque T3 is appropriate or not, based on whether the rotation torque T3 measured in the seal member assembly post-rotation torque measurement process (S10) is within a range of a reference value S3. The reference value S3 is a reference value used when it is determined whether the rotation torque after the seal member assembly is appropriate. As in the case of the press-in post-rotation torque determination process (S05), the seal member assembly post-rotation torque determination process (S11) can be performed using the determination device 15. In the seal member assembly post-rotation torque determination process (S11), if the rotation torque T3 is within the range of the reference value S3, it is determined that the rotation torque T3 is appropriate, and if the rotation torque T3 is outside the range of the reference value S3, it is determined that the rotation torque T3 is not appropriate. The reference value S3 has a lower limit value and an upper limit value in a prescribed range, and can be set in advance.

[0094] Thus, by determining whether the rotation torque of the wheel bearing apparatus 1 is appropriate using the rotation torque T3 measured in the seal member assembly post-rotation torque measurement process (S10) performed after the inner-side seal member assembly process (S09), it is possible to detect whether an abnormality has occurred in the components such as the inner-side seal member 9 and the processes such as the inner-side seal member assembly process (S09). Thus, it is possible to easily detect in which component or process an abnormality has occurred.

[0095] In the seal member assembly post-rotation torque determination process (S11), the reference value S3 can be set taking into account the rotation torque of the wheel bearing apparatus 1 that is increased by fitting the inner-side seal member 9 to the inner-side opening portion 2a of the outer ring 2. Thus, by setting the reference value S3 taking into account the rotation torque that is increased by the inner-side seal member 9, it is possible to accurately determine whether the rotation torque T3 is appropriate.

[0096] Also in the rotation torque determination step (S11) after the seal member assembly, as in the case of the rotation torque determination step (S05) after the press-in and the rotation torque determination step (S08) after the caulking, the reference value S3 can be set taking into account the variation of each condition such as the temperature of the outer side seal member 10, the grease, and the temperature of the wheel bearing apparatus 1. Thus, the determination of whether the rotation torque T3 is appropriate can be performed with high accuracy.

[0097] Also, the value of the measured rotation torque T3 can be corrected in accordance with the temperature of the wheel bearing apparatus 1 at the time of the measurement of the rotation torque T3. Thus, the determination of whether the rotation torque T3 is appropriate can be performed with high accuracy.

[0098] Note that, in the rotation torque inspection method of the present embodiment, the rotation torque determination step (S05) after the press-in, the rotation torque determination step (S08) after the caulking, and the rotation torque determination step (S11) after the seal member assembly are performed, but the rotation torque determination step (S05) after the press-in and the rotation torque determination step (S08) after the caulking can be performed. Also, either one of the rotation torque determination step (S05) after the press-in and the rotation torque determination step (S08) after the caulking can be performed.

[0099] [First Embodiment of the Rotation Torque Inspection Apparatus]

[0100] The rotation torque inspection method of the above-described first embodiment can be implemented by a rotation torque inspection apparatus provided with the torque measurer 12, the press-in apparatus 13, the drive source 14, the determination apparatus 15, and the caulking die 16.

[0101] For example, the rotation torque inspection apparatus can perform the press-in step (S02) of press-in of the inner ring 4 to a position at which the inner ring 4 and the hub 3 abut in the axial direction with respect to the small diameter stepped portion 3a of the hub 3 using the press-in apparatus 13. Also, the rotation torque inspection apparatus can perform the press-in after rotation torque measurement step (S04) of measurement of the press-in after rotation torque of the wheel bearing apparatus 1, i.e., the rotation torque T1, at the time of relative rotation of the inner member 3, 4 and the outer member 2 after the press-in step (S02) using the drive source 14 and the torque measurer 12. Also, the rotation torque inspection apparatus can perform the press-in after rotation torque determination step (S05) of determination of whether the rotation torque T1 is appropriate in accordance with whether the rotation torque T1 measured in the press-in after rotation torque measurement step (S04) is within the reference value S1 using the determination apparatus 15.

[0102] Further, the rotation torque checking device can perform a riveting process (S06) of riveting the inner side end portion of the small diameter stepped portion 3a of the inner ring 4, which is press-fitted, to the inner ring 4, using the riveting jig 16. Also, the rotation torque checking device can perform a post-riveting rotation torque measurement process (S07) of measuring the post-riveting rotation torque, i.e., the rotation torque T2, of the wheel bearing apparatus 1 when the inner side members 3, 4 and the outer side member 2 are relatively rotated after the riveting process (S06), using the determination device 15. Further, the rotation torque checking device can perform a post-riveting rotation torque determination process (S08) of determining whether the rotation torque T2 is appropriate or not, based on whether the rotation torque T2 measured in the post-riveting rotation torque measurement process (S07) is within the range of the reference value S2, using the determination device 15.

[0103] [Second Embodiment of Wheel Bearing Apparatus]

[0104] Hereinafter, a second embodiment of a wheel bearing apparatus, i.e., a wheel bearing apparatus 1A, to which the rotation torque checking method of the present application is applied will be described. Figure 9 A second embodiment of a wheel bearing apparatus, i.e., a wheel bearing apparatus 1A, to which the rotation torque checking method of the present application is applied will be described.

[0105] Figure 9 The wheel bearing apparatus 1A illustrated in the drawing supports a drive wheel to be rotatable in a suspension apparatus of a vehicle such as an automobile. The wheel bearing apparatus 1A has a structure called the third generation, and has an outer ring 2 as an outer side member, a hub ring 30 and an inner ring 4 as inner side members, a double-row inner side ball row 5 and a double-row outer side ball row 6 as rolling rows, and an inner side seal member 9 and an outer side seal member 10.

[0106] The wheel bearing apparatus 1A is different from the wheel bearing apparatus 1 having the hub ring 3 not formed with a through hole in that the wheel bearing apparatus 1A has the hub ring 30 formed with a through hole 30i through which a drive shaft of the vehicle penetrates. The structure of the wheel bearing apparatus 1A other than the hub ring 30 is the same as that of the wheel bearing apparatus 1, and thus the description thereof is omitted.

[0107] At the inner side end portion of the hub ring 30, a small diameter stepped portion 30a is formed in the outer peripheral surface to be smaller in diameter than the outer side end portion. The small diameter stepped portion 30a extends in the axial direction, and a shoulder portion 30e is formed at the outer side end portion of the small diameter stepped portion 30a in the hub ring 30. A wheel mounting flange 30b for mounting a wheel is integrally formed at the outer side end portion of the hub ring 30. A bolt hole 30f into which a hub bolt for fastening and linking the hub ring 30 to a wheel or a brake member is press-fitted is provided in the wheel mounting flange 30b.

[0108] In the hub ring 30, an inner track surface 30c on the outer side is provided opposite to the outer track surface 2d on the outer side of the outer ring 2. A lip sliding surface 30d is formed on the base side of the wheel mounting flange 30b in the hub ring 30 for sliding contact with the outer side sealing member 10. The outer side sealing member 10 is fitted into the outer side opening end of the annular space formed by the outer ring 2 and the hub ring 30. The hub ring 30 has an outer side end face 30g at the end that is further outward than the wheel mounting flange 30b.

[0109] An inner ring 4 is provided on the small-diameter stepped portion 30a of the hub ring 30. The inner ring 4 is fixed by pressing it into the small-diameter stepped portion 30a of the hub ring 30. The small-diameter stepped portion 30a of the hub ring 30 is not riveted to the inner side end face 4b of the inner ring 4. In other words, the wheel bearing device 1A is a bearing device for a drive wheel configured such that no riveting is performed on the inner side end of the hub ring 30.

[0110] [Second Implementation of the Rotational Torque Checking Method]

[0111] Next, a second embodiment of the rotational torque checking method of the present invention, namely, the rotational torque checking method of the wheel bearing device 1A, will be described. Figure 10 As shown, the rotational torque checking method in this embodiment is mainly performed during the assembly of the wheel bearing assembly 1A. Specifically, the rotational torque checking method includes a temporary pressing-in process (S21), a pressing-in process (S22), a sealing process (S23), a rotational torque measurement process after pressing-in (S24), a rotational torque determination process after pressing-in (S25), an inner side sealing component assembly process (S26), a rotational torque measurement process after sealing component assembly (S27), and a rotational torque determination process after sealing component assembly (S28). The following describes each step of the rotational torque checking method.

[0112] (Temporary pressing process)

[0113] like Figure 11 As shown, the hub ring 30 is placed on the support platform 11 with its axial direction perpendicular and its outer side end face 30g facing downwards. The outer side end face 30g of the hub ring 30 contacts the support platform 11. An outer ring 2 is mounted on the hub ring 30 placed on the support platform 11 in a manner that allows it to rotate via the inner side ball bearing row 5 and the outer side ball bearing row 6. An outer side sealing member 10 is fitted into the outer side end of the outer ring 2. Grease is filled between the hub ring 30 and the outer ring 2.

[0114] In the temporary pressing process (S21), similarly to the temporary pressing process (S01), the inner ring 4 is temporarily pressed into the small-diameter stepped portion 30a of the hub ring 30. At the point when the temporary pressing of the inner ring 4 is completed, there is an axial positive clearance Gb between the outer side end face 4c of the inner ring 4 and the shoulder 30e of the hub ring 30. Similar to the temporary pressing process (S01), the temporary pressing process (S21) can be performed using the pushing device 13.

[0115] (Pressing process)

[0116] The pressing process (S22) is performed after the temporary pressing process (S21). Figure 12 As shown, in the pressing process (S22), similarly to the pressing process (S02), the inner ring 4 is pressed into the small-diameter stepped portion 30a of the hub ring 30. Similar to the pressing process (S02), the pressing process (S22) can be performed using the pushing device 13. After the inner ring 4 is pressed into the small-diameter stepped portion 30a in the pressing process (S22), axial negative clearances are generated between the inner side ball bearing row 5 and the inner side outer ring track surface 2c and the inner ring track surface 4a, and between the outer side ball bearing row 6 and the outer side outer ring track surface 2d and the hub ring track surface 30c.

[0117] (Sealing process)

[0118] After the pressing process (S22), a sealing process (S23) is performed. In the sealing process (S23), similarly to the sealing process (S03), the hub ring 30 with the inner ring 4 pressed in is rotated relative to the outer ring 2, causing the grease filled between the hub ring 30 and the outer ring 2 to seal against the balls 7 of the inner ball row 5 and the outer ball row 6. Similar to the sealing process (S03), the sealing process (S23) can be performed using the drive source 14.

[0119] By performing the sealing process (S23), the resistance generated between the grease and the ball bearing 7 can be kept constant when the hub ring 30 and the outer ring 2 rotate relative to each other. Therefore, when measuring the rotational torque of the wheel bearing assembly 1A in the subsequent pressing-in rotational torque measurement process (S24) and the sealing member assembly rotational torque measurement process (S27), deviations in the measured rotational torque can be suppressed. Furthermore, by rotating the hub ring 3 and the outer ring 2 relative to each other for more than 30 revolutions, deviations in the measured rotational torque can be effectively suppressed.

[0120] (Measurement of rotational torque after pressing)

[0121] The post-pressing rotation torque measurement process (S24) is implemented after the close contact process (S23). In the post-pressing rotation torque measurement process (S24), as in the case of the post-pressing rotation torque measurement process (S04), the rotation torque T4 when the hub ring 30 with the small diameter stepped portion 30a pressed by the inner ring 4 is relatively rotated by the driving source 14 is measured by the torque measurer 12. Thus, the post-pressing rotation torque measurement process (S24) can be implemented using the driving source 14 and the torque measurer 12. The rotation torque T4 is an example of a post-pressing rotation torque. In addition, the rotation torque T4 is a rotation torque measured in a state where the riveting process is not implemented on the inner side end portion of the hub ring 30 after the pressing process (S22) and before the inner side seal member fitting process (S26).

[0122] In the post-pressing rotation torque measurement process (S24), the rotation speed of the hub ring 30 or the outer ring 2 is set to a range of the rotation speed N1-N2 in a region where the rotation torque changes from decreasing to increasing. In the present embodiment, the rotation speed N1 as the lower limit value of the range of the rotation speed is set to 10 rpm. The rotation speed N2 as the upper limit value of the range of the rotation speed is set to 30 rpm. Thus, even if the rotation speed changes in the measurement of the rotation torque T4, the variation of the rotation torque T4 can be reduced, and thus the rotation torque can be stably measured.

[0123] In addition, in the post-pressing rotation torque measurement process (S24), the rotation torque T4 of the wheel bearing apparatus 1A is measured in a state where the outer side opening end of the annular space formed by the outer ring 2 and the hub ring 30 is fitted with the outer side seal member 10. Here, the outer side seal member 10 is located on the side axially opposite to the small diameter stepped portion 30a of the hub ring 30 to which the inner ring 4 is pressed, and thus even if an abnormality occurs in the inner raceway surface 4a or the like, the influence on the sealing torque of the outer side seal member 10 is difficult, and the rotation torque of the wheel bearing apparatus 1A is less likely to change.

[0124] (Post-pressing rotation torque determination process)

[0125] The post-pressing rotation torque determination process (S25) is implemented after the post-pressing rotation torque measurement process (S24). In the post-pressing rotation torque determination process (S25), as in the case of the post-pressing rotation torque determination process (S05), it is determined whether the rotation torque T4 is appropriate or not depending on whether the rotation torque T4 measured in the post-pressing rotation torque measurement process (S24) is within the range of the reference value S4 or not. The post-pressing rotation torque determination process (S25) can be implemented using the determination device 15. The reference value S4 is an example of a reference value used when it is determined whether the post-pressing rotation torque is appropriate or not. The reference value S4 has a lower limit value and an upper limit value in a prescribed range, and can be set in advance.

[0126] In this way, by using the rotational torque T4 measured in the post-pressing rotational torque measurement step (S24) to determine whether the rotational torque of the wheel bearing assembly 1A is appropriate, it is possible to detect whether any abnormalities have occurred in components such as the outer side sealing member 10 and in processes such as the pressing step (S22) during the manufacturing process of the wheel bearing assembly 1A. Therefore, compared to determining whether the rotational torque is appropriate after the wheel bearing assembly 1A is completed, it is easier to detect which component or process has caused an abnormality, thereby reducing the number of discarded parts.

[0127] Furthermore, in the post-pressing rotational torque determination process (S25), similarly to the post-pressing rotational torque determination process (S05), the reference value S4 can be set considering deviations in various conditions such as the temperature of the outer side sealing member 10, the lubricating grease, and the wheel bearing assembly 1A. Moreover, the measured value of the rotational torque T4 can be corrected based on the temperature of the wheel bearing assembly 1A where the measured rotational torque T4 is located. Therefore, it is possible to determine with high precision whether the rotational torque T4 is appropriate.

[0128] (Inner side sealing component assembly process)

[0129] After the pressing-in rotational torque determination process (S25), the inner side sealing component assembly process (S26) is performed. For example... Figure 13 As shown, in the inner side sealing member assembly step (S26), similarly to the inner side sealing member assembly step (S09), the inner side sealing member 9 is assembled between the inner side end of the outer ring 2 and the inner side end of the inner ring 4. In this case, for example, the inner side sealing member 9 can be assembled between the inner side end of the outer ring 2 and the inner side end of the inner ring 4 using a sealing member assembly tool (not shown). That is, the inner side sealing member assembly step (S26) can be performed using a sealing member assembly tool.

[0130] (Method for measuring the rotational torque after assembling the sealing component)

[0131] The sealing member assembly post-rotation torque measurement process (S27) is implemented after the inner side sealing member assembly process (S26). In the sealing member assembly post-rotation torque measurement process (S27), as in the case of the press-in post-rotation torque measurement process (S24), the measurement of the rotation torque is performed in a state in which the dynamic friction is generated between the inner member 30, 4 and the outer member 2. In the sealing member assembly post-rotation torque measurement process (S27), the rotation torque T5 when the hub ring 30 of which the small diameter stepped portion 30a is pressed in by the driving source 14 and the outer ring 2 relatively rotate is measured by the torque measurer 12. In this way, the sealing member assembly post-rotation torque measurement process (S27) can be implemented using the driving source 14 and the torque measurer 12. The rotation torque T5 is the sealing member assembly post-rotation torque measured after the inner side sealing member assembly process (S26).

[0132] In the sealing member assembly post-rotation torque measurement process (S27), as in the case of the press-in post-rotation torque measurement process (S24), the rotation torque is measured instead of the starting torque of the bearing, and the rotation torque T5 is measured while the hub ring 30 or the outer ring 2 is rotated at a constant rotation speed in the range of the low speed rotation speeds N1 to N2, so the rotation torque can be measured with high accuracy.

[0133] In addition, the same process as the tight fitting process (S23), that is, a tight fitting process of making the lubricating grease filled between the hub ring 30 and the outer ring 2 tight to the balls 7 of the inner side ball row 5 and the outer side ball row 6 can be implemented between the inner side sealing member assembly process (S26) and the sealing member assembly post-rotation torque measurement process (S27). As in the case of the tight fitting process (S23), this tight fitting process can be implemented using the driving source 14. Thus, the resistance generated between the lubricating grease and the balls 7 when the hub ring 30 and the outer ring 2 relatively rotate becomes constant, so it is possible to further suppress the case where a deviation occurs in the measured rotation torque T5 when the rotation torque T5 of the wheel bearing device 1A is measured in the sealing member assembly post-rotation torque measurement process (S27).

[0134] However, in the case where the lubricating grease and the balls 7 are sufficiently tight by implementing the tight fitting process (S23) and the resistance between the lubricating grease and the balls 7 is constant, the tight fitting process between the inner side sealing member assembly process (S26) and the sealing member assembly post-rotation torque measurement process (S27) can be omitted.

[0135] (SEALING MEMBER ASSEMBLY POST-ROTATION TORQUE DETERMINATION PROCESS)

[0136] The post-seal-member assembly rotation torque determination process (S28) is performed after the post-seal-member assembly rotation torque measurement process (S27). In the post-seal-member assembly rotation torque determination process (S28), as in the case of the post-press-in rotation torque determination process (S25), it is determined whether the rotation torque T5 is appropriate based on whether the rotation torque T5 measured in the post-seal-member assembly rotation torque measurement process (S27) is within the range of the reference value S5. The reference value S5 is a reference value used when it is determined whether the post-seal-member assembly rotation torque is appropriate. The post-seal-member assembly rotation torque determination process (S28) can be performed using the determination device 15. The reference value S5 has a lower limit value and an upper limit value in a prescribed range, and can be set in advance. The reference value S5 can be set to the same value as the reference value S4, or can be set to a different value from the reference value S4.

[0137] Thus, by determining whether the rotation torque of the wheel bearing apparatus 1A is appropriate using the rotation torque T5 measured in the post-seal-member assembly rotation torque measurement process (S27) performed after the inner-side seal-member assembly process (S26), it is possible to detect whether an abnormality has occurred in the inner-side seal member 9 and the like and in the inner-side seal-member assembly process (S26) and the like. Thus, it is possible to easily detect in which component or process an abnormality has occurred.

[0138] In the post-seal-member assembly rotation torque determination process (S28), the reference value S5 can be set taking into account the rotation torque of the wheel bearing apparatus 1A that increases due to the fitting of the inner-side seal member 9 to the inner-side opening portion 2a of the outer ring 2. Thus, by setting the reference value S5 taking into account the rotation torque that increases due to the inner-side seal member 9, it is possible to accurately determine whether the rotation torque T5 is appropriate.

[0139] In addition, in the post-seal-member assembly rotation torque determination process (S28), as in the case of the post-press-in rotation torque determination process (S25), the reference value S5 can be set taking into account the variation in each condition such as the outer-side seal member 10, the lubricating grease, and the temperature of the wheel bearing apparatus 1. Also, the value of the measured rotation torque T5 can be corrected according to the temperature of the wheel bearing apparatus 1A in which the rotation torque T5 is measured. Thus, it is possible to accurately determine whether the rotation torque T5 is appropriate.

[0140] Note that, in the rotation torque inspection method of the present embodiment, the post-press-in rotation torque determination process (S25) and the post-seal-member assembly rotation torque determination process (S28) are performed, but only the post-press-in rotation torque determination process (S25) can be performed.

[0141] [Second Embodiment of the Rotation Torque Inspection Apparatus]

[0142] The rotational torque checking method of the second embodiment described above can be implemented by a rotational torque checking device provided with the torque measurer 12, the push-in device 13, the driving source 14, and the determination device 15.

[0143] For example, the rotational torque checking device can implement a press-in process (S22) of pressing the inner ring 4 in the axial direction to a position at which the inner ring 4 and the hub ring 3 are in abutment with respect to the small-diameter stepped portion 3a of the hub ring 3 using the push-in device 13. In addition, the rotational torque checking device can implement a post-press-in rotational torque measurement process (S24) of measuring the post-press-in rotational torque of the wheel bearing device 1, i.e., the rotational torque T4, when the inner member 3, 4 and the outer member 2 are relatively rotated after the press-in process (S22) using the driving source 14 and the torque measurer 12. Furthermore, the rotational torque checking device can implement a post-press-in rotational torque determination process (S25) of determining whether the rotational torque T4 is appropriate according to whether the rotational torque T4 measured in the post-press-in rotational torque measurement process (S24) is within the range of the reference value S4 using the determination device 15.

[0144] The embodiments of the present application have been described above, but the present application is not limited to the above-described embodiments, but is merely illustrative, and it is self-evident that the present application can be implemented in various modes within the scope of the gist of the present application without departing from the gist of the present application, and the scope of the present application is shown by the content described in the technical solution, and includes the meaning equivalent to the content described in the technical solution, and all modifications within the scope.

[0145] Industrial Applicability

[0146] The present application can be utilized for a wheel bearing device.

[0147] Explanation of Reference Signs

[0148] 1, 1A bearing device for wheel; 2 outer ring; 2c (inner side) outer side track surface; 2d (outer side) outer side track surface; 3, 30 hub ring; 3a, 30a small diameter step portion; 3c, 30c inner side track surface; 3h riveting portion; 4 inner ring; 4a inner side track surface; 4b inner ring inner side end portion; 4c inner ring inner side end portion; 5 inner side ball row; 6 outer side ball row; 7 ball; 9 inner side seal member; 10 outer side seal member; 12 torque measurer; Ga, Gb axial positive clearance; N1, N2 rotational speed; T1, T4 rotational torque (after press-in rotational torque); T2 rotational torque (after riveting rotational torque); T3, T5 rotational torque (after seal member assembly rotational torque); S1, S4 reference value (reference value when judging after press-in rotational torque); S2 reference value (reference value when judging after riveting rotational torque); S3, S5 reference value (reference value when judging after seal member assembly rotational torque); S01, S21 temporary press-in process; S02, S22 press-in process; S03, S23 close process; S04, S24 after press-in rotational torque measurement process; S05, S25 after press-in rotational torque judgment process; S06 riveting process; S07 after riveting rotational torque measurement process; S08 after riveting rotational torque judgment process.

Claims

1. A rotational torque checking method of a bearing device for wheel, wherein the bearing device for wheel is provided with: an outer member having double-row outer track surfaces on an inner periphery; an inner member including a hub ring having a small-diameter stepped portion extending in an axial direction on an outer periphery, and an inner ring press-fitted into the small-diameter stepped portion of the hub ring, and having double-row inner track surfaces opposed to the double-row outer track surfaces; and double-row rolling elements housed in a free-rolling manner between the two track surfaces of the outer member and the inner member, the rotational torque checking method of the bearing device for wheel is characterized in that the rotational torque checking method of the bearing device for wheel is provided with: a press-fitting process of press-fitting the inner ring in the axial direction to a position at which the inner ring and the hub ring are in abutment with respect to the small-diameter stepped portion of the hub ring; a post-press-fitting rotational torque measuring process of measuring a post-press-fitting rotational torque of the bearing device for wheel when the inner member and the outer member are relatively rotated after the press-fitting process; and a post-press-fitting rotational torque determining process of determining whether the post-press-fitting rotational torque is appropriate or not in accordance with whether the post-press-fitting rotational torque measured in the post-press-fitting rotational torque measuring process is within a range of a reference value, the inner member and the outer member are relatively rotated at a rotational speed of 10 rotations / min to 30 rotations / min in the post-press-fitting rotational torque measuring process, and the rotational torque is measured.

2. The rotational torque checking method of the bearing device for wheel according to claim 1, wherein an outer-side sealing member is fitted to an outer-side opening end of a ring-shaped space formed by the outer member and the inner member in the post-press-fitting rotational torque measuring process.

3. The rotational torque checking method of the bearing device for wheel according to claim 1, wherein a value of the post-press-fitting rotational torque measured is corrected in accordance with a temperature of the bearing device for wheel in which the post-press-fitting rotational torque is measured in the post-press-fitting rotational torque measuring process.

4. The rotational torque checking method of the bearing device for wheel according to any one of claims 1 to 3, wherein grease is filled between the hub ring and the outer member, the rotational torque checking method of the bearing device for wheel is further provided with a close-contact process performed at least between the press-fitting process and the post-press-fitting rotational torque measuring process, in which the grease is made to close-contact to the rolling elements by relatively rotating the inner member and the outer member.

5. A rotational torque checking method of a bearing device for wheel, wherein the bearing device for wheel is provided with: an outer member having double-row outer track surfaces on an inner periphery; an inner member including a hub ring having a small-diameter stepped portion extending in an axial direction on an outer periphery, and an inner ring press-fitted into the small-diameter stepped portion of the hub ring, and having double-row inner track surfaces opposed to the double-row outer track surfaces; and double-row rolling elements housed in a free-rolling manner between the two track surfaces of the outer member and the inner member, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The rotation torque checking method of the bearing device for wheel is characterized in that The rotation torque checking method of the bearing device for wheel is characterized in that The riveting process rivets the inner side end portion of the small diameter stepped portion of the inner ring, which is press-fitted into the inner ring, to the inner ring; The post-riveting rotation torque measurement process measures the post-riveting rotation torque of the bearing device for wheel when the inner member and the outer member are relatively rotated after the riveting process; and The post-riveting rotation torque determination process determines whether the post-riveting rotation torque is appropriate based on whether the post-riveting rotation torque measured in the post-riveting rotation torque measurement process is within a reference value range, In the post-riveting rotation torque measurement process, the inner member and the outer member are relatively rotated at a rotational speed of 10 rotations / min to 30 rotations / min, and the rotational torque is measured.

6. The rotation torque checking method of the bearing device for wheel according to claim 5, wherein In the post-riveting rotation torque measurement process, an outer side sealing member is fitted to an outer side opening end of a ring-shaped space formed by the outer member and the inner member.

7. The rotation torque checking method of the bearing device for wheel according to claim 5, wherein In the post-riveting rotation torque measurement process, the value of the post-riveting rotation torque measured is corrected based on the temperature of the bearing device for wheel for which the post-riveting rotation torque is measured.

8. The rotation torque checking method of the bearing device for wheel according to any one of claims 5 to 7, wherein Grease is filled between the hub ring and the outer member, The rotation torque checking method of the bearing device for wheel further includes a close process that is implemented at least between the riveting process and the post-riveting rotation torque measurement process, in which the grease is caused to close to the rolling elements by relatively rotating the inner member and the outer member.

9. A rotation torque checking device of a bearing device for wheel, wherein The bearing device for wheel includes: an outer member having double-row outer track surfaces on an inner periphery; an inner member including a hub ring having a small diameter stepped portion extending in an axial direction on an outer periphery, and an inner ring press-fitted into the small diameter stepped portion of the hub ring, and having double-row inner track surfaces opposed to the double-row outer track surfaces; and double-row rolling elements housed between the two track surfaces of the outer member and the inner member in a free-rolling manner, The rotation torque checking device of the bearing device for wheel is characterized in that The rotation torque checking device of the bearing device for wheel is capable of implementing the following processes: a press-in process of axially press-fitting the inner ring to a position at which the inner ring and the hub ring are in contact, with respect to the small diameter stepped portion of the hub ring; a post-press-in rotation torque measurement process of measuring a post-press-in rotation torque of the bearing device for wheel when the inner member and the outer member are relatively rotated after the press-in process; and a post-press-in rotation torque determination process of determining whether the post-press-in rotation torque is appropriate based on whether the post-press-in rotation torque measured in the post-press-in rotation torque measurement process is within a reference value range. The post-pressing rotation torque determination process determines whether the post-pressing rotation torque is appropriate based on whether the post-pressing rotation torque determined in the post-pressing rotation torque determination process is within a reference value range, In the post-pressing rotation torque determination process, the inner member and the outer member are relatively rotated at a rotation speed of 10 rotations / min to 30 rotations / min, and the rotation torque is determined.

10. A rotation torque inspection device for a wheel bearing device, wherein The wheel bearing device includes: an outer member having double-row outer track surfaces on an inner periphery; an inner member including a hub ring having a small-diameter stepped portion extending in an axial direction on an outer periphery, and an inner ring press-fitted to the small-diameter stepped portion of the hub ring, and having double-row inner track surfaces opposed to the double-row outer track surfaces; and double-row rolling elements housed between the two track surfaces of the outer member and the inner member in a freely-rolling manner, The rotation torque inspection device for the wheel bearing device is characterized in that The rotation torque inspection device for the wheel bearing device can perform the following processes: a riveting process of riveting an inner side end portion of the small-diameter stepped portion to which the inner ring is press-fitted to the inner ring; a post-riveting rotation torque determination process of determining a post-riveting rotation torque of the wheel bearing device when the inner member and the outer member are relatively rotated after the riveting process; and a post-riveting rotation torque determination process of determining a post-riveting rotation torque of the wheel bearing device when the inner member and the outer member are relatively rotated after the riveting process; and a post-riveting rotation torque determination process of determining a post-riveting rotation torque of the wheel bearing device when the inner member and the outer member are relatively rotated after the riveting process; and In the post-riveting rotation torque determination process, the inner member and the outer member are relatively rotated at a rotation speed of 10 rotations / min to 30 rotations / min, and the rotation torque is determined.

Images