JP2008196665A - Wheel rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel rolling bearing device for suitably reducing the sound pressure level of abnormal sounds which are generated in the state where a vehicle is suddenly started or suddenly turned. <P>SOLUTION: A washer member 40 is laid between a side face 39 of an inner ring 31 and a side face 16 of a driving shaft 10. The washer member 40 has a mating face B formed between an first annular member 41 and a second annular member 42, as an uneven face to engage one with the other in a relatively rotatable manner. The contact area of the mating face B is thereby increased to reduce the friction resistance of the mating face B with a reduction of bearing pressure. Thus, when torsional torque operates between the side face 39 of the inner ring 31 and the side face 16 of the driving shaft 10, the sound pressure level of abnormal sounds which are generated in a stick-slip phenomenon is reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling bearing device for a wheel mainly used in an automobile.

  Conventionally, as a rolling bearing device for a wheel that supports a drive wheel, a drive shaft that transmits a driving force from an engine is coupled to a central hole of an inner shaft to which the wheel is attached, and the drive shaft and the inner shaft rotate integrally. What is made to let you do is known. In such a vehicle bearing device, as shown in Patent Document 1, the inner ring of the rolling bearing is attached to the outer periphery of the inner shaft from the inner side (the side opposite to the side on which the wheel is attached). . The drive shaft is configured to have a large diameter portion on the inner side and a small diameter portion on the outer side (side on which the wheel is attached), and the small diameter portion is inserted into the center hole of the inner shaft. Then, the spline formed on the inner peripheral surface of the central hole of the inner shaft and the spline formed on the outer peripheral surface of the small-diameter portion of the drive shaft are spline-engaged so that the rotation direction of the inner shaft and the drive shaft is increased. Joining is taking place. Also, the inner side surface of the inner ring is brought into contact with the outer side surface of the large-diameter portion, and a nut is screwed into the screw portion provided at the outer-side tip of the small-diameter portion of the driving shaft so that the drive shaft is On the other hand, the inner shaft and the drive shaft are connected in the axial direction by pressing toward the outer side and applying a pressing force between the side surfaces. By connecting the drive shaft and the inner shaft in this way, an appropriate preload is applied to the inner ring of the rolling bearing, and the drive shaft, the inner shaft, and the inner ring are rotated together.

  Further, in the wheel rolling bearing device as described above, the inner ring is fixed by changing the method of fixing the inner ring to the inner shaft and caulking the inner side shaft end of the inner shaft (hereinafter, this caulking is called the shaft end caulking). There is something to do. In such a wheel rolling bearing device, an appropriate preload is applied to the inner ring of the rolling bearing by shaft end caulking. Then, the inner side surface of the caulking portion is brought into contact with the outer side surface of the large-diameter portion of the drive shaft, the drive shaft and the inner shaft are coupled by pressing the nut, and the drive shaft, the inner shaft, and the inner ring are integrated. To rotate it.

  By the way, in such a rolling bearing device for wheels, a large torsion torque may be applied to the drive shaft in a situation where the vehicle suddenly starts or turns. If a large torsional torque is applied to the drive shaft, minute relative motion will occur in the circumferential direction on the contact surface due to the difference in torsional rigidity between the drive shaft and the inner shaft between the spline and the contact surface. And At this time, until the torsional torque generated on the contact surface exceeds the frictional resistance caused by the surface pressure due to the pressing of the nut, the relative movement does not occur on the contact surface, and the torsional torque exceeds the frictional resistance. A stick-slip phenomenon occurs in which a sudden relative movement occurs and energy is released. When such a stick-slip phenomenon occurs, abnormal noise is generated due to a sudden relative motion on the contact surface.

Therefore, as shown in Patent Document 1, a wheel rolling bearing device in which a low friction member is interposed on a contact surface has been proposed. In this rolling bearing device for wheels, the contact surface is configured to be slippery with a low friction member, thereby suppressing the occurrence of stick-slip phenomenon and the generation of abnormal noise.
Registered Utility Model No. 2532672

  By the way, in the rolling bearing device for wheels as shown in Patent Document 1, the contact surface is configured to be slippery, so that the rigidity in the coupled state of the drive shaft and the inner shaft and the fatigue of the drive shaft and the like is reduced. There is a risk of lowering the strength. Furthermore, when wear of the drive shaft or the like progresses due to slippage of the contact surface, the coupling strength between the drive shaft and the inner shaft or the preload applied to the inner ring may be reduced.

  Further, the abnormal noise due to the stick-slip phenomenon as described above increases the energy released by the relative motion and increases the sound pressure level as the surface pressure due to the pressing of the nut increases. For this reason, there is a case where the sound pressure level of abnormal noise cannot be effectively reduced only by focusing on the friction coefficient as shown in Patent Document 1 without considering the magnitude of the surface pressure.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wheel rolling bearing device that can suitably reduce the sound pressure level of abnormal noise generated by a stick-slip phenomenon. .

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a drive shaft having a large-diameter portion on the inner side and a small-diameter portion on the outer side, and an inner attached to the outer periphery of the small-diameter portion via a spline. A shaft and an inner ring of a rolling bearing attached to the outer periphery of the inner shaft from the inner side, pressing the drive shaft against the inner shaft toward the outer side, and the inner side surface of the inner ring and the outer side of the large-diameter portion In the wheel rolling bearing device in which the driving shaft, the inner shaft, and the inner ring are coupled by applying a pressing force to the side surface, a plurality of the pressing force is applied between the side surfaces. A washer member having an annular member overlapped in the axial direction is interposed, and the washer member is formed such that at least a pair of mating surfaces of the annular member are formed by concave and convex surfaces engaged with each other so as to be relatively rotatable. As a summary .

  According to this configuration, a washer member in which a plurality of annular members are overlapped in the axial direction is interposed between the inner side surface of the inner ring and the outer side surface of the large-diameter portion of the drive shaft. The member is formed by an uneven surface in which at least a pair of mating surfaces of the annular member are engaged with each other so as to be relatively rotatable. For this reason, it is possible to make the contact area on the mating surface larger than the contact area when each side surface is in direct contact, and when the pressing force is applied between the side surfaces, the surface pressure on the mating surface is minimized. Can be small. As a result, the frictional resistance between the mating surfaces can be reduced, so that when the torsional torque acts between the side surfaces, a stick-slip phenomenon can be generated on the mating surfaces. Since the frictional resistance of the mating surfaces is reduced, the energy accumulated by the stick-slip phenomenon can be reduced, and the abnormal noise generated by releasing the energy can also be reduced. Therefore, by interposing such a washer member between the side surfaces, it is possible to easily reduce the sound pressure level of abnormal noise that occurs when the vehicle suddenly starts or turns.

  According to a second aspect of the present invention, there is provided a drive shaft having a large diameter portion on the inner side and a small diameter portion on the outer side, an inner shaft attached to the outer periphery of the small diameter portion via a spline, and an inner shaft An inner ring of a rolling bearing fixed to the inner shaft by caulking the side shaft end, pressing the drive shaft to the outer side against the inner shaft, and an inner side surface of the caulking portion formed by the caulking In the rolling bearing device for a wheel in which a driving shaft and an inner shaft are coupled by applying a pressing force between the outer diameter side surface of the large diameter portion, between each side surface to which the pressing force is applied. Includes a washer member in which a plurality of annular members are overlapped in the axial direction, and the washer member is formed by an uneven surface in which at least a pair of mating surfaces of the annular member engage with each other in a relatively rotatable manner. To be done It is the gist.

  According to this configuration, a washer member in which a plurality of annular members are overlapped in the axial direction is interposed between the inner side surface of the caulking portion of the inner shaft and the outer side surface of the large-diameter portion of the drive shaft. The washer member is formed by an uneven surface in which at least a pair of mating surfaces of the annular member are engaged with each other so as to be relatively rotatable. Thus, even when a pressing force is applied between the side surface on the inner side of the caulking portion and the side surface on the outer side of the large diameter portion, the contact area on the mating surface is increased similarly to the above-described invention, The frictional resistance between the mating surfaces can be reduced. For this reason, when a torsional torque acts between the side surfaces, the energy accumulated by the stick-slip phenomenon can be reduced, and the noise generated by releasing the energy can also be reduced. Therefore, by interposing such a washer member between the side surfaces, it is possible to easily reduce the sound pressure level of abnormal noise that occurs when the vehicle suddenly starts or turns.

The gist of the invention described in claim 3 is that, in the rolling bearing device for a wheel according to claim 1 or 2, the lubricant is applied between the uneven surfaces of the mating surfaces.
According to this configuration, since the lubricant is applied between the uneven surfaces of the mating surfaces, the frictional resistance between the mating surfaces can be further reduced. For this reason, when torsional torque is applied between the side surfaces, the energy accumulated on the mating surfaces is reduced by the stick-slip phenomenon, and the sound pressure level of abnormal noise generated by releasing the energy is further reduced. Can do.

  According to the present invention, at least a pair of mating surfaces of the annular member is provided by interposing a washer member, in which a plurality of annular members are overlapped in the axial direction, between side surfaces such as a drive shaft and an inner shaft to which a pressing force is applied. Since the contact area at is relatively large, the surface pressure at the mating surface can be minimized. Accordingly, since the frictional resistance between the mating surfaces can be reduced, the energy accumulated by the stick-slip phenomenon of the mating surfaces can be reduced when the torsional torque acts between the side surfaces, and the energy is released. The abnormal noise generated by can be reduced. For this reason, it is possible to reduce the sound pressure level of abnormal noise generated in a situation where the vehicle suddenly starts or turns.

(First embodiment)
Hereinafter, with reference to FIGS. 1-3, 1st Embodiment which actualized the rolling bearing apparatus for wheels which concerns on this invention is described. FIG. 1 is a longitudinal sectional view of a wheel rolling bearing device 1. The wheel rolling bearing device 1 includes a drive shaft 10, an inner shaft 20, a rolling bearing 30, and a washer member 40.

  The drive shaft 10 is connected to the engine via a transmission, a differential, and a constant velocity joint (not shown), and the output rotation of the engine is transmitted. The drive shaft 10 has a large-diameter portion 11 on the inner side connected to the constant velocity joint, and a small-diameter portion 12 on the outer side coupled to the inner shaft 20. On the outer periphery of the small-diameter portion 12 of the drive shaft 10, a spline portion 13 is formed in the middle in the axial direction, and a screw portion 14 is formed at the outer end.

  The inner shaft 20 includes a shaft portion 21 and an annular flange portion 22 formed at the outer side end portion of the shaft portion 21 so as to extend radially outward. A wheel of a wheel (not shown) is fastened to the flange portion 22 by a bolt 23. A center hole 24 into which the drive shaft 10 is inserted is formed at the center of the shaft portion 21. A spline portion 25 is formed on the inner periphery of the center hole 24 at a position facing the spline portion 13 of the drive shaft 10.

  The rolling bearing 30 is a double-row angular ball bearing, and is attached to the outer peripheral surface of the axial center portion of the shaft portion 21. The rolling bearing 30 includes an inner ring 31, an outer ring 32, balls 33 and 34 arranged on the inner side and outer side as double row rolling elements, and a seal member 35 disposed on the outer side and inner side. The inner ring 31 is attached to the outer periphery of the shaft portion 21 of the inner shaft 20 from the inner side, the inner peripheral surface 36 is fitted with the outer peripheral surface 26 of the shaft portion 21, and the outer side surface 37 is a step of the shaft portion 21. It is in contact with the side surface 27. A first track 31 a that is a track surface of the ball 33 on the inner side is formed on the outer periphery of the inner ring 31. A second raceway 21 a that is a raceway surface of the outer ball 34 is formed on the outer periphery of the shaft portion 21 on the flange portion 22 side.

  On the other hand, the outer ring 32 includes a first outer ring raceway 32a that faces the first raceway 31a and a second outer ring raceway 32b that faces the second raceway 21a. Further, a flange portion 38 extending outward in the radial direction is provided on the outer peripheral surface of the outer ring 32. The flange portion 38 is attached to a vehicle suspension system (not shown). The inner ball 33 is disposed between the first track 31a and the first outer ring track 32a, and the outer ball 34 is disposed between the second track 21a and the second outer ring track 32b. Yes. The seal member 35 is interposed between the both side portions of the outer ring 32 and the inner ring 31 and the shaft portion 21, and foreign matters such as muddy water, gravel, and pebbles are removed from the outer ring 32, the inner ring 31, and the shaft portion 21 as the vehicle travels. Intrusion into the inside of the rolling bearing 30 from the gap is prevented.

  The washer member 40 is formed in an annular shape, and is interposed between the inner side surface 39 of the inner ring 31 and the outer side surface 16 of the large-diameter portion 11 of the drive shaft 10, and the inner peripheral surface thereof is a shaft. The outer peripheral surface 26 of the portion 21 is loosely fitted. FIG. 2 is an enlarged longitudinal sectional view showing the configuration around the washer member 40. As shown in the figure, the washer member 40 includes a first annular member 41 disposed on the inner side and a second annular member 42 disposed on the outer side, and the first annular member 41 and the second annular member. 42 is superposed in the axial direction. The mating surface 41a formed on the outer side of the first annular member 41 and the mating surface 42a formed on the inner side of the second annular member 42 are formed by concave and convex surfaces that engage with each other so as to be relatively rotatable. .

  FIG. 3 is a plan view of the first annular member 41 as viewed from the outer side. As shown in the figure, the conical surface 41 a of the first annular member 41 has three conical surfaces. On the other hand, the conical surface 42a of the second annular member 42 is formed with three conical surfaces that come into contact with these conical surfaces, respectively. Thus, by forming the mating surfaces 41a and 42a with concavity and convexity surfaces made of conical surfaces, the mating surface 41a and the mating surface 42a are engaged with each other so as to be relatively rotatable, and the contact area between the mating surfaces 41a and 42a is matched. The surface is made larger than when the surface is formed as a flat surface.

  Further, a lubricant such as grease or oil is applied between the mating surface 41a and the mating surface 42a. By applying the lubricant in this manner, the frictional resistance between the mating surface 41a and the mating surface 42a is reduced, and the mating surfaces 41a and 42a are easily rotated relative to each other. The first annular member 41 has an inner side surface 41 b in contact with the side surface 16 of the drive shaft 10, and the second annular member 42 has an outer side surface 42 b in contact with the side surface 39 of the inner ring 31.

  In the wheel rolling bearing device 1 configured as described above, the drive shaft 10 and the inner shaft 20 are coupled as follows. By inserting the small diameter portion 12 of the drive shaft 10 into the center hole 24 of the inner shaft 20, the spline portion 13 of the small diameter portion 12 and the spline portion 25 of the center hole 24 are spline-engaged. And the rotation direction are combined. Further, a washer member 40 is interposed between the inner side surface 39 of the inner ring 31 and the outer side surface 16 of the large-diameter portion 11 of the drive shaft 10, and the nut 15 is screwed into the screw portion 14 of the drive shaft 10. Thus, the drive shaft 10 is pressed to the outer side with respect to the inner shaft 20, and the drive shaft 10, the inner shaft 20, and the inner ring 31 are coupled in the axial direction. By coupling the drive shaft 10 and the inner shaft 20 and the like in this way, an appropriate preload is applied to the inner ring 31 of the rolling bearing 30, and the drive shaft 10, the inner shaft 20, and the inner ring 31 rotate integrally. It is configured to do.

  Next, a case where a large torsional torque is applied between the side surface 39 of the inner ring 31 and the side surface 16 of the drive shaft 10 in a situation where the vehicle starts suddenly or turns sharply will be described. When torsional torque is applied between the side surface 39 of the inner ring 31 and the side surface 16 of the drive shaft 10, the contact surface A between the side surface 39 of the inner ring 31 and the side surface 42 b of the second annular member 42, and the first annular member 41 Of the mating surface B of the mating surface 41a and the mating surface 42a of the second annular member 42 and the abutting surface C of the side surface 41b of the first annular member 41 and the side surface 16 of the drive shaft 10, the surfaces that abut each other are relatively Try to exercise.

  At this time, since the mating surface B has a larger contact area than the contact surfaces A and C, the surface pressure generated by the screwing of the nut 15 becomes lower than the surface pressure generated by the contact surfaces A and C, and the friction The resistance is low. Moreover, since the lubricant is applied to the mating surface B, the frictional resistance is lower. For this reason, when the torsional torque as described above is applied, a stick-slip phenomenon occurs at the mating surface B. When the stick-slip phenomenon occurs on the mating surface B, since the mating surface B has a low frictional resistance as described above, the energy accumulated on the mating surface B is reduced due to the stick-slip phenomenon and accumulated. Abnormal noise generated by releasing energy is reduced.

  In this way, when the washer member 40 is interposed between the side surface 39 of the inner ring 31 and the side surface 16 of the drive shaft 10, the surface pressure of the surface where the stick-slip phenomenon occurs compared to the case where the washer member 40 is not interposed. The frictional resistance can be reduced. Furthermore, if a lubricant is applied to the surface where the stick-slip phenomenon occurs, the frictional resistance can be further reduced. For this reason, in the rolling bearing device 1 for wheels, the level of the abnormal sound pressure generated by the stick-slip phenomenon can be suitably reduced.

According to the wheel rolling bearing device 1 of the first embodiment, the following effects can be obtained.
(1) In the first embodiment, the washer member 40 is interposed between the side surface 39 of the inner ring 31 and the side surface 16 of the drive shaft 10, and the washer member 40 includes the first annular member 41 and the second annular member 42. Are formed by concave and convex surfaces that engage with each other so as to be relatively rotatable. For this reason, the contact area on the mating surface B can be increased as compared to the case where the mating surface is formed as a flat surface or the case where the side surface 39 of the inner ring 31 and the side surface 16 of the drive shaft 10 are in direct contact. Therefore, since the surface pressure generated on the mating surface B by the screwing of the nut 15 can be reduced, the frictional resistance of the mating surface B can be reduced. As a result, when a torsional torque acts between the side surface 39 of the inner ring 31 and the side surface 16 of the drive shaft 10, the energy accumulated by the stick-slip phenomenon can be reduced, and the difference generated by the release of the energy can be reduced. Sound can also be reduced. For this reason, it is possible to reduce the sound pressure level of abnormal noise generated in a situation where the vehicle suddenly starts or turns.

  (2) In the first embodiment, since the lubricant is applied to the mating surface B of the first annular member 41 and the second annular member 42 of the washer member 40, the frictional resistance between the mating surfaces is reduced. be able to. For this reason, when a torsional torque is applied between the side surface 39 of the inner ring 31 and the side surface 16 of the drive shaft 10, the energy accumulated on the mating surface is reduced by the stick-slip phenomenon, and the energy is released. The sound pressure level of abnormal noise can be further reduced.

(Second Embodiment)
Next, with reference to FIG. 4, 2nd Embodiment which actualized the rolling bearing device for wheels which concerns on this invention is described. The wheel rolling bearing device 2 of the second embodiment is different from the wheel rolling bearing device 1 of the first embodiment in that the inner ring 31 is fixed to the inner shaft 20 by caulking of the shaft end of the inner shaft 20. . In the embodiments described below, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions thereof are omitted or simplified.

  FIG. 4 is a longitudinal sectional view of the wheel rolling bearing device 2. As shown in the figure, the inner ring 31 of the rolling bearing 30 is fixed by a caulking portion 28 formed by caulking at the shaft end. The shaft end caulking is performed in a state where the inner peripheral surface 36 of the inner ring 31 is fitted to the outer peripheral surface 26 of the shaft portion 21 and the outer side surface 37 of the inner ring 31 is in contact with the stepped portion side surface 27 of the shaft portion 21. This is performed by pressing a caulking jig from the inner side of the shaft end of the shaft portion 21. Then, the shaft end is plastically deformed radially outward to form a caulking portion 28, and the inner ring 31 is fixed to be pressed against the outer side. Thereby, the inner ring 31 is securely fixed to the inner shaft 20 and an appropriate preload is applied to the inner ring 31.

  The washer member 40 is formed in an annular shape, and is interposed between the inner side surface 29 of the caulking portion 28 and the outer side surface 16 of the large-diameter portion 11 of the drive shaft 10. The drive shaft 10 is loosely fitted to the outer peripheral surface 17 formed at the base of the small diameter portion 12. As in the first embodiment, the washer member 40 includes a first annular member 41 and a second annular member 42, and the mating surface B is formed by an uneven surface that engages with each other so as to be relatively rotatable. A lubricant is applied to the mating surface B.

  The drive shaft 10 and the inner shaft 20 are coupled as follows. By inserting the small diameter portion 12 of the drive shaft 10 into the center hole 24 of the inner shaft 20, the spline portion 13 of the small diameter portion 12 and the spline portion 25 of the center hole 24 are spline-engaged. And the rotation direction are combined. Further, a washer member 40 is interposed between the inner side surface 29 of the caulking portion 28 and the outer side surface 16 of the large diameter portion 11 of the drive shaft 10, and the nut 15 is screwed onto the screw portion 14 of the drive shaft 10. As a result, the drive shaft 10 is pressed to the outer side with respect to the inner shaft 20, and the drive shaft 10 and the inner shaft 20 are coupled in the axial direction. By connecting the drive shaft 10 and the inner shaft 20 in this way, the drive shaft 10, the inner shaft 20, and the inner ring 31 are configured to rotate integrally.

  In the wheel rolling bearing device 2 configured as described above, when a large torsional torque is applied between the side surface 29 of the caulking portion 28 and the side surface 16 of the drive shaft 10 when the vehicle suddenly starts or turns, the washer The member 40 functions similarly to the first embodiment. That is, since the mating surface B of the washer member 40 has a low frictional resistance, a stick-slip phenomenon occurs on the mating surface B. When the stick-slip phenomenon occurs on the mating surface B having a low frictional resistance, the energy accumulated on the mating surface B is reduced, and the noise generated by releasing the accumulated energy can be reduced.

  In this way, when the washer member 40 is interposed between the side surface 29 of the caulking portion 28 and the side surface 16 of the drive shaft 10, the surface of the surface where the stick-slip phenomenon occurs compared to the case where the washer member 40 is not interposed. The pressure can be lowered, and the frictional resistance can be reduced. Furthermore, if a lubricant is applied to the surface where the stick-slip phenomenon occurs, the frictional resistance can be further reduced. For this reason, in the rolling bearing device 2 for wheels, the sound pressure level of the abnormal sound generated by the stick-slip phenomenon can be suitably reduced, and the same effects as the effects (1) and (2) of the first embodiment can be achieved. Obtainable.

In addition, you may change the said embodiment as follows.
In the above embodiment, the washer member 40 has three conical surfaces formed on the mating surface 41a of the first annular member 41 and the mating surface 42a of the second annular member 42, and is configured to engage with each other so as to be relatively rotatable. However, two conical surfaces or four or more conical surfaces may be formed on the mating surfaces 41a and 42a so as to engage with each other so as to be relatively rotatable. As an example, FIG. 5A shows a cross-sectional view when the mating surfaces 41a and 42a are constituted by five conical surfaces.

  In the above embodiment, the washer member 40 is configured by the conical surface of the mating surface 41a of the first annular member 41 and the mating surface 42a of the second annular member 42, but is configured by a surface other than the conical surface such as a curved surface. Alternatively, a curved surface and a conical surface may be used. As an example, FIG. 5B shows a cross-sectional view when the mating surfaces 41a and 42a are formed of curved surfaces. Even if the mating surfaces 41a and 42a are configured as shown in the respective forms of FIG. 5, the contact area of the mating surface B can be increased to reduce the surface pressure, and the frictional resistance of the mating surface B can be reduced. .

  In the above embodiment, the washer member 40 is composed of two annular members, the first annular member 41 and the second annular member 42, but the washer member may be composed of three or more annular members. . 6A and 6B are cross-sectional views when the washer member 50 is constituted by three annular members 51, 52, and 53. FIG. In this way, the relative movement of the mating surface caused by the stick-slip phenomenon is the relative motion of the annular member 51 and the annular member 52 on the mating surface D and the relative motion of the annular member 52 and the annular member 53 on the mating surface E. Therefore, it is possible to reduce noise generated by relative motion.

  In the above embodiment, the contact area of the mating surface B is increased so that the stick-slip phenomenon occurs on the mating surface B. However, the contact surface between the washer member 40 and the drive shaft 10, and the washer The friction coefficient of the contact surface between the member 40 and the inner ring 31 or the caulking portion 28 may be increased so that the stick-slip phenomenon occurs reliably on the mating surface B.

  In the above embodiment, the second raceway 21 a that is the raceway surface of the outer ball 34 is formed on the outer periphery of the shaft portion 21 on the flange portion 22 side, but an individual inner ring member is provided on the outer side of the inner ring 31. The second track 21a may be formed on the inner ring.

  In the above embodiment, a double row ball bearing is used as the rolling bearing 30, but a double row tapered roller bearing may be used.

The longitudinal section of the rolling bearing device for wheels concerning a 1st embodiment. The expanded longitudinal cross-sectional view which shows the structure around a washer member. The top view when a 1st annular member is seen from the outer side. The longitudinal cross-sectional view of the rolling bearing apparatus for wheels which concerns on 2nd Embodiment. (A), (b) is sectional drawing which shows the mating surface of the washer member in the other example of this invention. (A), (b) is sectional drawing which shows the mating surface of the washer member in the other example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 2 ... Rolling bearing apparatus for wheels, 10 ... Drive shaft, 11 ... Large diameter part, 12 ... Small diameter part, 15 ... Nut, 20 ... Inner shaft, 21 ... Shaft part, 28 ... Caulking part, 30 ... Rolling bearing, 31 ... Inner ring, 32 ... Outer ring, 40 ... Washer member, 41 ... First annular member, 42 ... Second annular member.

Claims (3)

A drive shaft having a large diameter portion on the inner side and a small diameter portion on the outer side;
An inner shaft attached to the outer periphery of the small diameter portion via a spline;
An inner ring of a rolling bearing attached to the outer periphery of the inner shaft from the inner side,
The drive shaft is pressed to the outer side with respect to the inner shaft, and a pressing force is applied between the inner side surface of the inner ring and the outer side surface of the large-diameter portion, so that the drive shaft, the inner shaft, and the inner ring In the rolling bearing device for wheels,
Between each side surface to which the pressing force is applied, a washer member in which a plurality of annular members are overlapped in the axial direction is interposed,
The rolling bearing device for a wheel according to claim 1, wherein the washer member includes at least a pair of mating surfaces of the annular member that are engaged with each other so as to be relatively rotatable. A drive shaft having a large diameter portion on the inner side and a small diameter portion on the outer side;
An inner shaft attached to the outer periphery of the small diameter portion via a spline;
An inner ring of a rolling bearing fixed to the inner shaft by caulking the inner side shaft end of the inner shaft;
Driving the drive shaft by pressing the drive shaft toward the outer side and applying a pressing force between the inner side surface of the caulking portion formed by the caulking and the outer side surface of the large diameter portion. In a rolling bearing device for a wheel in which a shaft and an inner shaft are coupled,
Between each side surface to which the pressing force is applied, a washer member in which a plurality of annular members are overlapped in the axial direction is interposed,
The rolling bearing device for a wheel according to claim 1, wherein the washer member includes at least a pair of mating surfaces of the annular member that are engaged with each other so as to be relatively rotatable. In the rolling bearing device for wheels according to claim 1 or 2,
A rolling bearing device for a wheel, wherein a lubricant is applied between the uneven surfaces of the mating surfaces.

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