JP2000289403A - Rolling bearing unit for wheel support and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a structure for easy assembly to a vehicle having a sufficient durability. SOLUTION: A caulking part 25 is formed with externally fitting a first and a second inner rings 13, 14 to a step part 20 of a hub 12, and these members 13, 14, 12 are connected and secured therebetween. Shape of the first inner ring 13 is determined by taking an amount of an elastic deformation thereof associated with the formation of the caulking part 25 into account before formation thereof. An abutting condition for the inside surface of a first inner ring track 18 and a first large flange 22 with a tapered roller 4 is made to be normal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The rolling bearing unit for supporting wheels according to the present invention is used to rotatably support relatively heavy wheels for automobiles such as small trucks and large passenger cars with respect to a suspension system.

[0002]

2. Description of the Related Art The wheels of an automobile are rotatably supported by a rolling bearing unit on a suspension system. In addition, a double-row tapered roller bearing unit is used to support a heavy automobile wheel. FIG. 10 shows a double-row tapered roller bearing unit 1 conventionally widely used to support wheels. This double row tapered roller bearing unit 1
A pair of inner rings 3, 3 are rotatably supported by a plurality of tapered rollers 4, 4, respectively, on the inner diameter side of one outer ring 2. On the inner peripheral surface of the outer ring 2, double-row outer ring tracks 5, 5 each having a conical concave shape, and on the outer peripheral surface of each inner ring 3, each inner ring track 6, each having a conical convex shape, 6 are formed respectively. The tapered rollers 4, 4 are held between the outer raceways 5, 5 and the inner raceways 6, 6, respectively, while being held by the retainers 7, 7 so as to be freely rotatable. Further, between the inner peripheral surfaces of both ends of the outer ring 2 and the outer peripheral surfaces of the ends of the inner rings 3, 3,
A pair of seal rings 8 and 8 are attached to the space 9 where the tapered rollers 4 and 4 are installed to close the openings at both axial ends.

[0003] Double row tapered roller bearing unit 1 as described above
Therefore, in order to support the wheels with respect to the suspension, the outer ring 2 is internally fitted and supported in a support hole provided in the suspension, and
An axle that supports the wheels is inserted into each of the inner rings 3,3.
By the way, a double row rolling bearing unit 1 as shown in FIG.
Accordingly, when the wheels are supported on the suspension device, the number of man-hours in an automobile assembly factory is large, and it is difficult to reduce the cost. For this reason, in order to support wheels of automobiles, such as light trucks and large passenger cars, which are relatively heavy, but need to consider mass productivity (assembly), wheel bearings combining more parts at the bearing factory are required. A rolling bearing unit has also been constructed.

[0004]

The rolling bearing unit for supporting the wheel has a structure in which double row tapered roller bearings are incorporated, and further, in order to reduce the number of components, the shaft member and the inner ring are connected to the shaft member. It is necessary to connect and fix the cylindrical portions formed at the ends with a caulking portion formed by plastically deforming the cylindrical portion outward in the diameter direction. When the shaft member and the inner ring member are connected and fixed in this manner, the inner ring externally fitted to the shaft member is elastically deformed as the cylindrical portion is plastically deformed. Therefore, if this elastic deformation is not taken into consideration, the contact state between the inner ring and the tapered rollers becomes irregular, and it becomes difficult to ensure the durability of the rolling bearing unit for supporting wheels. The wheel supporting rolling bearing unit and the method of manufacturing the same according to the present invention have been made in view of such circumstances.

[0005]

A rolling bearing unit for supporting a wheel according to the present invention has an outer raceway ring having first and second outer raceways each having a conical concave curved surface on an inner peripheral surface. The member, the inner and outer raceway members forming the first and second inner raceways, each of which is a conical convex curved surface on the outer peripheral surface, and the first and second inner raceways and the first and second inner raceways. A plurality of tapered rollers are provided between the outer raceway and the outer raceway. In the rolling bearing unit for supporting a wheel according to the present invention, the inner raceway ring member includes an inner race having the first inner raceway formed on an outer peripheral surface thereof, and a direct or another inner race formed on the outer peripheral surface thereof. And a shaft member forming the second inner raceway through the shaft member. The inner ring is fitted around the end of the shaft member, and the axial end surface is formed by a caulking portion formed by plastically deforming a cylindrical portion formed at the end of the shaft member outward in the diametrical direction. By being held down, it is supported and fixed to the shaft member.

In particular, in the case of the rolling bearing unit for supporting wheels according to the first aspect, at least one of the following requirements is satisfied. The inclination angle of the first inner raceway relative to the center axis of the shaft member is smaller than an appropriate value before the formation of the caulked portion, and the caulked portion is formed to support and fix the inner ring to the shaft member. In this state, the inclination angle of the first inner raceway is set to an appropriate value. The inclination angle of the inner side surface of the large collar formed on the outer peripheral surface of the large diameter side end of the inner ring with respect to a virtual plane orthogonal to the center axis of the shaft member is made smaller than an appropriate value before the formation of the caulked portion. In a state where the caulking portion is formed and the inner ring is supported and fixed to the shaft member, the inclination angle of the inner surface of the large collar is set to an appropriate value. The first inner ring raceway is crowned,
The crowning amount of the first inner ring raceway is made larger than an appropriate value before the formation of the caulked portion, and in a state where the caulked portion is formed and the inner ring is supported and fixed to the shaft member,
The crowning amount is set to an appropriate value.

Further, a method for manufacturing a wheel supporting rolling bearing unit according to claim 2 satisfies at least one of the following requirements. The inclination angle of the first inner ring raceway with respect to the center axis of the shaft member is set smaller than an appropriate value before the formation of the caulked portion, and this caulked portion is formed to support and fix the inner ring to the shaft member. Based on the accompanying elastic deformation of the inner race, the inclination angle of the first inner raceway is set to an appropriate value. The inclination angle of the inner side surface of the large collar formed on the outer peripheral surface of the large diameter side end of the inner ring with respect to a virtual plane orthogonal to the center axis of the shaft member is made smaller than an appropriate value before the formation of the caulked portion. In addition, the inclination angle of the inner side surface of the large collar is adjusted to an appropriate value based on the elastic deformation of the inner ring accompanying the formation of the caulking portion and the support and fixing of the inner ring to the shaft member. Crowning is applied to the first inner raceway as a crowning amount larger than an appropriate value in a state before the formation of the caulked portion, and the caulked portion is formed to support and fix the inner ring to the shaft member. The crowning amount is set to an appropriate value on the basis of the elastic deformation of the inner ring accompanying the above.

[0008]

According to the rolling bearing unit for supporting a wheel and the method of manufacturing the same according to the present invention constructed as described above, regardless of the elastic deformation of the inner ring caused by the plastic deformation of the cylindrical portion, the inner ring and the tapered rollers are connected to each other. The contact state can be changed to the normal state. Because of this,
The durability of the wheel supporting rolling bearing unit can be easily ensured. In addition, it is preferable to satisfy all the requirements of ~,
If at least one requirement is satisfied, the durability can be improved accordingly.

[0009]

1 to 3 show a first embodiment of the present invention. The rolling bearing unit 10 for supporting a wheel of the present embodiment includes an outer ring 11 which is an outer diameter side raceway member, a hub 12 which is a shaft member which is combined with each other to form an inner diameter side raceway member, and first and second hubs. Inner rings 13, 14;
And a plurality of tapered rollers (4, 4). Of these, the outer race 11 has first and second outer raceways 15, 16 each having a conical concave surface on the inner circumferential surface, and the outer race 11 on the outer circumferential surface for supporting and fixing the outer race 11 to a suspension device. Outward flange-shaped mounting portions 17 are respectively formed. The first,
The inclination directions of the second outer raceways 15, 16 are opposite to each other.

The outer peripheral surfaces of the first and second inner rings 13 and 14 have first and second conical convex surfaces, respectively.
The second inner ring raceways 18 and 19 are formed. The first,
The second inner rings 13 and 14 are inner half portions of the hub 12 (half portions that are closer to the center in the width direction when assembled to a vehicle,
It is externally fitted to the step 20 formed in the right half of FIG. 1). In this state, the inclination directions of the first and second inner raceways 18, 19 are opposite to each other. In addition, the outer end of the hub 12 (the end that is outward in the width direction when assembled to a vehicle, which is the left end in FIG. 1) has an outer peripheral surface that protrudes from the outer end opening of the outer race 11. A flange 21 for supporting and fixing the wheel to the hub 12 is formed.

Further, the first and second outer raceways 15, 1
The plurality of tapered rollers 4, 4 are provided between the first and second inner ring raceways 18, 19, respectively, in such a manner that the tapered rollers 4, 4 are held by the retainers 7, 7 so as to freely roll. .
Also, between the inner peripheral surfaces of both ends of the outer ring 11 and the outer peripheral surfaces of the first and second large collars 22 and 23 formed on the opposite ends of the first and second inner rings 13 and 14, respectively. A sealing means such as a combination seal ring 8, 8 is provided to close the opening at both axial ends of the space 9 in which the tapered rollers 4, 4 are installed.

Of the first and second inner rings 13 and 14,
The second inner race 14 is fitted externally to the inner part (left part in FIG. 1) of the step portion 20 formed on the hub 12, and the first inner race 13 is fitted externally to the inner end. The first inner race 13 is formed by a caulking portion 25 formed by plastically deforming a cylindrical portion 24 formed at the inner end of the hub 12 outward in the diametrical direction.
Of the inner end face. In this state, the first and second inner rings 13 and 14 are sandwiched from both sides in the axial direction by the stepped surface 26 formed at the deep end of the stepped portion 20 and the caulking portion 25, and the hub 12 Fixed to

The cross-sectional shape of the inner end surface of the caulked portion 24 is a compound curved surface having a large radius of curvature on the inner diameter side and a small radius of curvature on the outer diameter side. In order to form such a caulked portion 25, the inner peripheral surface of the cylindrical portion 24 before plastic deformation is
It has a conical concave surface whose diameter increases toward the inner end opening. Also, when the caulking portion 25 is subjected to plastic working, particularly at the end of the working, a force (compression stress) directed inward in the diametrical direction of the caulking portion 25 is applied to the caulking portion 2.
5, so as not to cause damage such as cracks. For this,
The plastic working of the caulking portion 25 is preferably performed by swing forging.

The hub 12 is integrally formed by forging a carbon steel material having a C (carbon) content of about 0.2 to 1.1% by weight. Then, an intermediate portion or a back portion of the step portion 20, a base portion of the flange 21, and the like,
The portions requiring strength are hardened and hardened by induction hardening or the like. However, the caulked portion 25 should be formed,
The above-mentioned cylindrical portion 24 is not subjected to a quenching process and is left as it is. In contrast, the first and second inner rings 1
Nos. 3 and 14 are made of high carbon chromium bearing steel such as SUJ2, and are hardened and hardened to the core. Or, the first,
The second inner rings 13 and 14 may be made of chrome steel, chrome molybdenum steel, or the like, and the surfaces may be hardened by carburizing and quenching.

With the formation of the caulking portion 25, a force is applied to the first and second inner rings 13 and 14, and particularly a large force is applied to the first inner ring 13 among them. However, since the first and second inner rings 13 and 14 are hardened, the deformation accompanying the formation of the caulked portion 25 including the first inner ring 13 is limited, and damages such as cracks occur. do not do.
In particular, in the illustrated example, a small diameter portion 27 is formed in the inner half of the first large collar 22 formed at the inner end of the first inner ring 13,
The caulking part 25 is located on the inner diameter side of the small diameter part 27. Therefore, the amount by which the outer diameter of the portion for externally fitting and supporting the combined seal ring 8 changes with the formation of the caulked portion 25 is small, and the amount of change is stable (small variation). . Therefore, if the combined seal ring 8 is manufactured in consideration of the change amount of the outer diameter, a necessary interference is secured, and the sealing performance of the combined seal ring 8 can be sufficiently secured.

Further, in the case of the rolling bearing unit for supporting wheels of the present embodiment, the first inner ring 13 is not affected by the force applied to the first inner ring 13 due to the formation of the caulking portion 25.
The contact state between the respective parts and the respective tapered rollers 4, 4 is in a normal state. The contact state between each part of the first inner race 13 and each of the tapered rollers 4, 4 is as follows: (1) The contact state between the first inner raceway 18 and the rolling surface of each of the rollers 4, 4 is as follows. (2) relating to the contact state between the inner side surface of the first large collar 22 and the large-diameter side end surface of each of the rollers 4, 4; Inner ring track 18
There are three types, namely, those related to crowning in the state of contact between these rollers 4 and 4 and the rolling surface. In the case of this example, these three types of contact states are all normal states. Next, means for setting these three contact states to the normal state will be described.

First, in order to make the contact state of the contact state between the first inner ring raceway 18 and the rolling surfaces of these rollers 4 and 4 related to the contact angle normal, the hub 12 with respect to the center axis of the hub 12 is brought into the normal state. Before the formation of the caulked portion 25, the inclination angle of the first inner raceway 18 is made smaller than an appropriate value. In other words, a force directed diametrically outward is applied to the inner end of the first inner race 13 along with the work of forming the caulked portion 25. Accordingly, with the work of forming the caulked portion 25, The inclination angle of the first inner raceway 18 increases, though slightly. Therefore, in the case of this example, as shown in FIG. 2, the inclination angle alpha ₂ of the in the first inner ring raceway 18 previously formed in the crimped portion 25, smaller than the appropriate inclination angle alpha ₁ ( α ₂ <α ₁ ). Then, the first inner ring 13 to form the crimped portion 25 in a state of being supported and fixed to the hub 12, the inclination angle of the first inner ring raceway 18 is the manner becomes a proper value alpha _1. Since the amount of elastic deformation of the first inner ring 13 accompanying the forming operation of the caulking portion 25 is always constant as long as the specifications of the rolling bearing unit are the same, the amount of the elastic deformation before the formation of the caulking portion 25 is increased. The inclination angle α ₂ to be given to one inner raceway 18 can be easily obtained by an experiment.

As described above, with the caulked portion 25 formed, the inclination angle of the first inner raceway 18 is adjusted to an appropriate value α.
Since it is set to ₁ , the contact state between the first inner raceway 18 and the rolling surfaces of the rollers 4, 4 can be made normal. For this reason, the first inner raceway 18 and the rolling surfaces of the rollers 4, 4 abut evenly over substantially the entire length thereof, thereby preventing the surface pressure of the abutting portion from becoming partially excessive. The rolling fatigue life of each surface can be ensured.

Next, in order to make the abutment state between the inner surface of the first large flange 22 and the large-diameter end surfaces of the rollers 4, 4 normal, the hub 12 is perpendicular to the central axis. Before the formation of the caulked portion 25, the inclination angle of the inner surface of the first large collar 22 formed on the outer peripheral surface of the large-diameter end of the first inner ring 13 with respect to the virtual plane is made smaller than an appropriate value. ing. That is, as the caulking portion 25 is formed, the inclination angle of the first large collar 22 increases, though slightly. Therefore, in the case of this example, as shown in FIG.
Before the formation of No. 5, the inclination angle β of the first large collar 22
₂ is smaller than the proper inclination angle β ₁ (β ₂ <β ₁ )
are doing. Then, the first inner ring 13 to form the crimped portion 25 in a state of being supported and fixed to the hub 12, the inclination angle of the first large rib 22 in the manner made a proper value beta _1. The inclination angle β ₂ to be given to the first large collar 22 before the formation of the caulked portion 25 can also be easily obtained by an experiment.

As described above, the angle of inclination of the first large collar 22 is set to the appropriate value β ₁ in the state where the caulking portion 25 is formed. , 4
The contact state with the large-diameter side end face can be made regular. For this reason, the contact position between the first large flange 22 and the large-diameter end surface of each of the rollers 4, 4 is set to a portion close to the rolling surface of each of the rollers 4, 4 (for the first inner raceway 18). (Closer to the outer diameter of the large diameter side end face). For this reason, the sliding friction at the contact portion between the inner side surface of the first large collar 22 and the large-diameter end surface of each of the rollers 4, 4 is reduced, and the rotational torque and heat generation of the wheel rolling bearing unit are reduced. Reduction can be achieved.

Further, in order to make the abutment state between the first inner raceway 18 and the rolling surfaces of the rollers 4 and 4 relating to crowning into a normal state, the first inner raceway 1
8 before the formation of the caulked portion 25,
It is larger than the appropriate value. That is, this caulking portion 25
With the formation operation, the cross-sectional shape of the first inner raceway 18 is elastically deformed in a direction in which the widthwise center portion is concave, though slightly. Therefore, in the case of this example, as shown in FIG. 3, the crowning amount δ ₂ of the first inner raceway 18 before the formation of the caulking portion 25 is larger than the appropriate crowning amount δ ₁ ( δ ₂ > δ ₁ ). The crowning amount of the first inner raceway 18 is adjusted to an appropriate value δ ₁ in a state where the caulking portion 25 is formed and the first inner race 13 is supported and fixed to the hub 12. The crowning amount δ ₂ to be given to the first inner raceway 18 before the formation of the caulking portion 25 can be easily obtained by an experiment.

As described above, since the crowning amount of the first inner raceway 18 is set to the appropriate value δ ₁ in the state where the caulking portion 25 is formed, the first inner raceway 18 and the rollers 4 4, the contact state with the rolling surface can be made normal.
More specifically, it is possible to prevent an edge load from being applied to the contact portions between the axial end portions of the rolling surfaces 4 and 4 of these rollers and the first inner raceway 18. For this reason, the first inner raceway 18 and the rolling surfaces of the rollers 4, 4 abut evenly over substantially the entire length thereof, thereby preventing the surface pressure of the abutting portion from becoming partially excessive. The rolling fatigue life of each surface can be ensured.

Incidentally, in the case of a general wheel supporting rolling bearing unit, the specifications of the tapered roller bearings provided in double rows are as follows.
Same as each other except for changing the direction of the contact angle. However,
The second inner ring 14 provided on the outside is hardly deformed by the forming operation of the caulking portion 25, and the inclination angle of the second inner ring track 19 and the second large collar 23, and furthermore, the second inner ring track 1
The crowning amount of No. 9 hardly changes. Therefore, the inclination angle and the amount of crowning of the second inner raceway 19 and the second large collar 23 are the same as those of the first inner raceway 18 and the first large collar after the caulking portion 25 is formed. 22, the inclination angles α ₁ and β ₁ and the crowning amount δ ₁ are matched. In short, before the caulking portion 25 is formed, the inclination angles of the inner raceways 18 and 19 and the large flanges 22 and 23 relate to the first inner race 13 but to the second inner race 1.
4 smaller than that for In addition, before the caulking portion 25 is formed, the crowning amount for the first inner ring 13 is larger than the crowning amount for the second inner ring 14. On the other hand, in the state after the formation of the caulking portion 25, the inclination angles and the crowning amounts of the first and second inner rings 13 and 14 are substantially equal to each other.

In the illustrated example, as described above, since the small diameter portion 27 is formed in the inner half of the first large collar portion 22,
Changes in the inclination angle and the amount of crowning of the first inner raceway 18 and the first large collar 22 due to the formation of the caulking portion 25 are small. Therefore, it is easy to adjust these inclination angles and crowning amounts to appropriate values. Further, in the illustrated example, as shown in FIG.
Is formed, the extension line a of the inner side surface of the first large collar 22 is not hung on the caulking portion 25, in other words, the extension line a is formed on the outer peripheral surface of the step portion 20. And a cylindrical portion of the inner peripheral surface of the first inner ring 13. Accordingly, the radial load applied to the first inner ring 13 from the tapered rollers 4 does not act in the direction in which the caulked portion 25 is loosened, and the durability of the caulked portion 25 can be ensured.

FIG. 4 shows a second embodiment of the present invention.
An example is shown. In the case of this example, the outer peripheral surface of the outer race 11a is not provided with the mounting portion 17 (FIG. 1), and the outer peripheral surface is a simple cylindrical surface. And when assembling to the vehicle,
The outer ring 11a is supported and fixed in a support hole 29 of a knuckle 28 constituting a suspension device. The other configurations and operations are the same as those of the first example described above, and therefore, the same parts are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 5 shows a third embodiment of the present invention.
An example is shown. In the case of this example, the rotation speed of the wheel fixed to the hub 12 can be detected. For this reason, in the case of this example, the base end of the encoder 30 is externally fixed to the first large collar 22 provided at the inner end of the first inner ring 13.
Further, a cover 31 is internally fitted and fixed to the inner end opening of the outer ring 11 in a state of closing the inner end opening, and the detection unit of the sensor 32 supported and fixed to the cover 31 is used as the detected portion of the encoder 30. They are close to each other. The structure and operation of the rotational speed detecting device constituted by the sensor 32 and the encoder 30 are well-known in the related art, and are not the gist of the present invention, so that the detailed description is omitted. In addition, since other configurations and operations are the same as those in the first example described above, the same parts are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 6 shows a fourth embodiment of the present invention.
An example is shown. In the case of this example, the second inner race 14 (FIGS. 1, 4, and 5) is omitted, and the second inner raceway 19 is formed directly on the outer peripheral surface of the intermediate portion of the hub 12a. Other configurations and operations are the same as those of the first example described above.

Next, FIG. 7 shows a fifth embodiment of the present invention.
An example is shown. In each of the first to fourth examples described above, the present invention is applied to a rolling bearing unit for supporting driven wheels (front wheels of FR and RR vehicles, rear wheels of FF vehicles). On the other hand, in the case of this example, the drive wheels (F
The present invention is applied to a rolling bearing unit for supporting an R car, a rear wheel of an RR car, a front wheel of an FF car, and all wheels of a 4WD car. For this reason, in the case of this example, a spline hole 33 is formed at the center of the hub 12b, and the spline hole 33 is formed.
, A spline shaft 35 attached to the constant velocity joint 34 is inserted. Then, the hub 12b is sandwiched between a nut 36 screwed to a tip portion (left end portion in FIG. 7) of the spline shaft 35 and an end surface of a housing portion 37 constituting the constant velocity joint 34. . A flat surface is formed on the end surface of the caulking portion 25 that abuts against the end surface of the housing portion 37 by plastic deformation based on caulking or by machining after caulking to secure a contact area between the butted surfaces. are doing. Other configurations and operations are the same as those of the first example described above.

FIG. 8 shows a sixth embodiment of the present invention.
An example is shown. In the case of this example as well, the present invention is applied to a rolling bearing unit for supporting a drive wheel. In particular, in the case of this example, a step portion 38 is formed on the inner peripheral surface of the inner end portion of the first inner ring 13a over the entire circumference, and the caulked portion 25 formed on the inner end portion of the hub 12b is used. The step 38 is held down. Along with this, the end face of the housing part 37 constituting the constant velocity joint 34 is directly in contact with the inner end face of the first inner ring 13a. Other configurations and operations are
Since this is the same as the case of the fifth example described above, the same parts are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 9 shows a seventh embodiment of the present invention.
An example is shown. In each of the first to sixth examples described above, the inner raceway ring member includes a hub that rotates together with the wheel, whereas in the case of the present embodiment, the outer raceway ring member includes the hub. , A hub 39 that rotates with the wheels. For this purpose, first and second outer raceways 15 and 16 are formed on the inner peripheral surface of the hub 39, and a flange 21a for supporting and fixing the wheel is formed on the outer peripheral surface.

The inner and outer race members are provided on the outer peripheral surface of a stationary shaft member 40, which is fixedly connected to a suspension device by a mounting portion 17a provided on the outer peripheral surface, of the first and second inner races 13, 14.
And fixed by a caulking portion 25 formed at the outer end of the stationary shaft member 40. The outer end opening of the hub 39 is closed by a cover 41. In the case of such an example, the first inner ring 1 provided on the outside (the left side in FIG. 9)
In the case of No. 3, after the formation of the caulking portion 25, the inclination angles of the inner side surfaces of the first inner raceway 18 and the first large collar 22 and the crowning amount of the first inner raceway 18 become appropriate values. To be considered. In the diametrical direction, the inside and outside of the rotating bearing ring are reversed, and the inside and outside in the axial direction are accordingly partially reversed.
It is almost the same as in the example.

[0032]

The rolling bearing unit for supporting a wheel and the method of manufacturing the same according to the present invention are constructed and operated as described above, so that the assembling work in the assembling factory of the vehicle is simplified and the manufacturing cost of the vehicle is reduced. As a result, it is possible to realize a structure capable of securing sufficient durability.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a first example of an embodiment of the present invention.

FIG. 2 is a view for explaining a state in which the inclination angle of the inner surface of the first inner ring raceway and the inner surface of the large brim changes with the processing of the caulking portion.
The enlarged view of the A section of FIG.

FIG. 3 is an enlarged view of a portion A in FIG. 1 for explaining a state in which a crowning amount of a first inner raceway changes with the processing of a caulking portion.

FIG. 4 is a half sectional view showing a second example of the embodiment of the present invention.

FIG. 5 is a half sectional view showing the third example.

FIG. 6 is a half sectional view showing the fourth example.

FIG. 7 is a half sectional view showing the fifth example.

FIG. 8 is a half sectional view showing the sixth example.

FIG. 9 is a half sectional view showing the seventh example.

FIG. 10 is a sectional view showing an example of a conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double row tapered roller bearing unit 2 Outer ring 3 Inner ring 4 Tapered roller 5 Outer ring track 6 Inner ring track 7 Cage 8 Combination seal ring 9 Space 10 Rolling bearing unit for wheel support 11, 11a Outer ring 12, 12a, 12b Hub 13, 13a One inner ring 14 Second inner ring 15 First outer ring track 16 Second outer ring track 17, 17a Attachment portion 18 First inner ring track 19 Second inner ring track 20 Step 21, 21a Flange 22 First large flange Reference Signs List 23 second large flange 24 cylindrical portion 25 caulking portion 26 step surface 27 small diameter portion 28 knuckle 29 support hole 30 encoder 31 cover 32 sensor 33 spline hole 34 constant velocity joint 35 spline shaft 36 nut 37 housing portion 38 step portion 39 hub 40 Stationary shaft member 41 Cover

Claims (2)

[Claims] An outer raceway ring member having first and second outer raceways formed on the inner peripheral surface, each of which is a conical concave curved surface, and a second convex racesurface formed on the outer peripheral surface, each having a conical convex shape. First and second inner ring raceways, the inner raceway ring members, and a plurality of each of these first and second inner raceways and the first and second outer raceways are provided in a freely rolling manner. In the rolling bearing unit for supporting wheels provided with tapered rollers, the inner raceway ring member includes an inner race having the first inner raceway formed on the outer peripheral surface thereof, and a direct or another inner race formed on the outer peripheral surface thereof. And a shaft member forming the second inner raceway through the inner race. The inner race is externally fitted to an end of the shaft member, and a cylindrical portion formed at an end of the shaft member is diametrically outwardly mounted. The axial end face can be suppressed by the caulked part formed by plastic deformation A rolling bearing unit for supporting a wheel, which is supported and fixed to the shaft member and further satisfies at least one of the following requirements. The inclination angle of the first inner raceway relative to the center axis of the shaft member is smaller than an appropriate value before the formation of the caulked portion, and the caulked portion is formed to support and fix the inner ring to the shaft member. In this state, the inclination angle of the first inner raceway is set to an appropriate value. The inclination angle of the inner side surface of the large collar formed on the outer peripheral surface of the large diameter side end of the inner ring with respect to a virtual plane orthogonal to the center axis of the shaft member is made smaller than an appropriate value before the formation of the caulked portion. In a state where the caulking portion is formed and the inner ring is supported and fixed to the shaft member, the inclination angle of the inner surface of the large collar is set to an appropriate value. The first inner ring raceway is crowned,
The crowning amount of the first inner ring raceway is made larger than an appropriate value before the formation of the caulked portion, and in a state where the caulked portion is formed and the inner ring is supported and fixed to the shaft member,
The crowning amount is set to an appropriate value. 2. A manufacturing method for manufacturing the rolling bearing unit for supporting a wheel according to claim 1, comprising:
A method for manufacturing a wheel-supporting rolling bearing unit, characterized by satisfying at least one of the above requirements. The inclination angle of the first inner ring raceway with respect to the center axis of the shaft member is set smaller than an appropriate value before the formation of the caulked portion, and this caulked portion is formed to support and fix the inner ring to the shaft member. Based on the accompanying elastic deformation of the inner race, the inclination angle of the first inner raceway is set to an appropriate value. The inclination angle of the inner side surface of the large collar formed on the outer peripheral surface of the large diameter side end of the inner ring with respect to a virtual plane orthogonal to the center axis of the shaft member is made smaller than an appropriate value before the formation of the caulked portion. In addition, the inclination angle of the inner side surface of the large collar is adjusted to an appropriate value based on the elastic deformation of the inner ring accompanying the formation of the caulking portion and the support and fixing of the inner ring to the shaft member. Crowning is applied to the first inner raceway as a crowning amount larger than an appropriate value in a state before the formation of the caulked portion, and the caulked portion is formed to support and fix the inner ring to the shaft member. The crowning amount is set to an appropriate value on the basis of the elastic deformation of the inner ring accompanying the above.