JP2003065346A - Bearing device for axle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a hub wheel 1 and an input shaft 25 to rotate as unit by a simple structure. SOLUTION: This bearing device for an axle has a hub wheel 1 which a wheel is provided with, an input shaft 25 being inserted into the hub wheel 1 and transmitting the rotation power and a rolling bearing 3 being arranged to the outer circumference of the hub wheel 1 and supporting the hub wheel 1 to a rotatably to a car body. In the hub wheel 1 and the input shaft 25, one member is inserted into the other member and a different diameter part 40 forming plural large diameter parts partially to the circumference in one end part of a hollow part T of the other member is provided, and a cylindrical part is provided to the end of a inserted part in one member. This enlarged diameter part 13 is provided by caulking in the condition where flares to the large diameter part of a different diameter part 40 through the means that this cylindrical part is enlarged for the outside of a diameter direction, and both members are integrally connected to the circumference and the axis directions by flare of the large diameter part with the enlarged diameter part 13 of this different diameter part 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle bearing device having a hub wheel to which wheels are attached and an input shaft for inputting rotational power to the hub wheel.

[0002]

2. Description of the Related Art Conventionally, a structure for integrally rotatably connecting an input shaft and a hub wheel has been such that a predetermined range of the inner circumference of a hollow portion formed in one member of the input shaft and the hub wheel and the other member. It is well known that splines are formed so as to be able to be fitted to the outer circumference of the formed fitting shaft portion and are fitted to each other by splines.

[0003]

However, in the above-mentioned prior art, since the spline is formed on the inner circumference of the hollow portion of one member and the outer circumference of the shaft portion fitted thereto, the cutting process is It is necessary, and the manufacturing process is complicated, and in the case of spline processing, it is necessary to manage the processing accuracy with high accuracy in order to prevent a reduction in life due to improper mounting of the fitted rolling bearing. This was a factor that increased costs.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an axle bearing device that allows a hub wheel and an input shaft to integrally rotate with a simple structure.

[0005]

According to a first aspect of the present invention, there is provided a bearing device for an axle, a hub wheel to which a wheel is attached, and an input shaft which is fitted to the hub wheel and transmits rotational power. And a rolling bearing that is disposed on the outer periphery of the hub wheel and rotatably supports the hub wheel with respect to the vehicle body, and is one of the hub wheel and the input shaft. The member is fitted in the hollow hole of the other member, and different-diameter portions in which a plurality of large-diameter portions are partially formed in the circumferential direction are provided at one end of the hollow hole of the other member. A cylindrical portion is provided at one end of the fitting portion, and by expanding the cylindrical portion outward in the radial direction, the enlarged diameter portion is caulked in a state of biting into the large diameter portion of the different diameter portion. Or, this difference Wherein the two members by biting the large-diameter portion and the enlarged diameter portion of the part is integrally coupled to the circumferential and axial directions.

According to the first aspect of the present invention, in order to integrally rotate the hub wheel and the input shaft, one member of the hub wheel and the input shaft is formed in the hollow hole of the other member. In the state of being internally fitted, the end portion of the one member that is to be fitted is crimped to the large diameter portion of the different diameter portion formed on the other member, and the crimped portion is bitten into the large diameter portion of the different diameter portion. Therefore, the processing is easier than the conventional method of forming splines.

Further, since the fitting of the large-diameter portion of the different-diameter portion and the caulking portion by biting is fitted in the circumferential direction and the axial direction, the fitting is performed in the radial direction even if an external force is applied. It is less likely that the caulking will be loosened, and the caulking will be restrained from being loosened in the axial direction.

According to another aspect of the present invention, there is provided an axle bearing device.
A hub wheel to which the wheel is attached, as shown in
A bearing device for an axle, comprising an input shaft fitted to the hub wheel to transmit rotational power, and a rolling bearing arranged on the outer periphery of the hub wheel to rotatably support the hub wheel with respect to a vehicle body. The input shaft is fitted in the hollow hole of the hub wheel, and a different diameter part partially formed with a plurality of large diameter parts in the circumferential direction is provided at one end of the hollow hole of the hub wheel. In addition, a cylindrical portion is provided at one end of the fitting portion of the input shaft, and by expanding the cylindrical portion outward in the radial direction, the expanded diameter portion is larger than the large diameter portion of the different diameter portion. The input shaft and the hub wheel are integrally coupled in the circumferential direction and the axial direction by the biting of the large diameter portion of the different diameter portion and the enlarged diameter portion. Characterize.

According to the second aspect of the present invention, in order to integrally rotate the hub wheel and the input shaft, the hub wheel is fitted in the hollow hole of the hub wheel while the hub wheel is being fitted therein. Since the end portion of the input shaft that is fitted to the large-diameter portion of the different-diameter portion formed in is crimped and the crimped portion is made to bite into the different-diameter portion, a spline is formed as in the past Processing is easier than doing.

Also, since the fitting of the large-diameter portion of the different-diameter portion and the caulking portion by biting is fitted in the circumferential direction and the axial direction, even if an external force acts, the fitting is performed in the radial direction. It is less likely that the caulking will be loosened, and the caulking will be restrained from being loosened in the axial direction.

A bearing device for an axle according to the present invention is defined in claim 3.
A hub wheel to which the wheel is attached, as shown in
A bearing device for an axle, comprising: an input shaft fitted to the hub wheel to transmit rotational power; and a rolling bearing arranged on the outer periphery of the hub wheel to rotatably support the hub wheel with respect to a vehicle body. The hub wheel is fitted into the hollow hole of the input shaft, and a different diameter part partially formed with a plurality of large diameter parts in the circumferential direction is provided at one end of the hollow hole of the input shaft. In addition, a cylindrical portion is provided at one end of the fitting portion of the hub wheel, and by expanding the cylindrical portion outward in the radial direction, the expanded diameter portion is larger than the large diameter portion of the different diameter portion. The input shaft and the hub wheel are integrally coupled in the circumferential direction and the axial direction by the biting of the large diameter portion of the different diameter portion and the enlarged diameter portion. Characterize.

According to the third aspect of the present invention, in order to integrally rotate the hub wheel and the input shaft, the input shaft is fitted in the hollow hole of the input shaft in the input shaft. Since the end portion where the hub wheel is fitted is crimped to the large diameter portion of the different diameter portion formed in, and the crimped portion is made to bite into the large diameter portion of the different diameter portion, It is easier to process than forming a spline.

Further, since the fitting of the large diameter portion of the different diameter portion and the caulking portion by biting is fitted in the circumferential direction and the axial direction, the fitting is performed in the radial direction even when an external force is applied. It is less likely that the caulking will be loosened, and the caulking will be restrained from being loosened in the axial direction.

A bearing device for an axle according to the present invention is defined in claim 4.
As described above, in the bearing device for an axle according to claim 2, the input shaft is a shaft portion of a constant velocity joint.

According to the structure of claim 4 of the present invention, the shaft portion of the constant velocity joint is fitted into the hub wheel and the end portion of the shaft portion is caulked so that the hub wheel has a different diameter portion. The caulking part is made to bite into and is integrally connected.

A bearing device for an axle according to the present invention is defined in claim 5.
As described above, in the bearing device for an axle according to claim 3, the input shaft is a bowl-shaped portion that constitutes a constant velocity joint.

According to the fifth aspect of the present invention, the hub wheel is fitted in the bowl-shaped portion of the constant velocity joint, and the end portion of the hub wheel that is fitted is caulked. The caulking portion is bited into the large-diameter portion of the different diameter portion of the bowl-shaped portion of the quick joint to integrally connect them.

A bearing device for an axle according to the present invention is defined in claim 6.
As described above, in the bearing device for an axle according to claim 2 or 4, the different diameter portion of the hub wheel is formed by forging.

According to the structure of claim 6 of the present invention, since the different diameter portion is formed by forging, a simple working process and a short working time are required.

A bearing device for an axle according to the present invention comprises:
As described above, in the bearing device for an axle according to claim 3 or 5, the different diameter portion of the input shaft is formed by forging.

According to the structure of claim 7 of the present invention, since the different diameter portion is formed by forging, a simple working process and a short working time are required.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention. FIG. 1 is a vertical sectional side view showing an axle bearing device, and FIG. 2 is a front view showing a caulked portion.

The axle bearing device shown in the figure is a hub wheel 1.
And a constant velocity joint 2 and a double row rolling bearing 3, and is used for supporting the drive wheels.

The hub wheel 1 has a hollow structure, and a radially outward flange 11 is formed on the outer peripheral surface of the hub wheel 1 on the vehicle outer side. The area on the vehicle inner side of the flange 11 on the outer peripheral surface of the hub wheel 1 is
In the double row rolling bearing 3 described below, the inner ring raceway surface 12 of the group of balls 32 on the vehicle outer side is formed. A disc rotor (not shown) and wheels (not shown) of the disc brake device are applied to the flange 11 and attached by a plurality of bolts (not shown).

As the constant velocity joint 2, a well-known Rzeppa type CVJ (Constant Velocity Joint) is used, and is provided with a bowl-shaped outer ring 21, an inner ring 22, a plurality of balls 23, a cage 24 and the like. On the small diameter side of the bowl-shaped outer ring 21, a shaft portion 25 as an input shaft is integrally formed in a projecting state, and a boundary portion between the bowl-shaped outer ring 21 and the shaft portion 25 is formed in the double row rolling bearing 3 described below. It is the inner ring raceway surface 26 of the group of balls 32 on the vehicle inner side. The axle shaft 6 is spline-fitted to the inner ring 22 so that the retaining ring 2
It is prevented from coming off with 8, etc. Although not shown, the other end of the axle shaft 6 is attached to a differential device of the vehicle through another constant velocity joint.

The double row rolling bearing 3 includes a single outer ring 31 having two rows of raceway grooves, a plurality of balls 32 as rolling elements arranged in two rows, and two crown-shaped cages 33. The inner raceway surface 12 of the hub wheel 1 and the inner raceway surface 26 of the bowl-shaped outer race 21 of the constant velocity joint 2 serve as inner races. A radially outward flange 34 is provided at an axial center of the outer peripheral surface of the outer ring 31, and the flange 34 is attached to a knuckle (not shown) that is a part of the vehicle body by a bolt (not shown). .

Next, an assembling form of each of the above components will be described.

First, while inserting the shaft portion 25 of the constant velocity joint 2 into the center hole T of the hub wheel 1 from the vehicle inner side, a double row rolling bearing is provided on the outer periphery extending over the hub wheel 1 and the constant velocity joint 2. Wear 3. At this time, the main body portion of the bowl-shaped outer ring 21 provided in the constant velocity joint 2 is arranged axially adjacent to the hub wheel 1.

After this, the shaft portion 25 of the constant velocity joint 2 is previously prepared.
In this case, the end of the cylindrical portion provided on the free end side of the hub wheel is bent outwardly in a radial direction by a jig, and in this case, the end portion of the cylindrical portion is bent and caulked to a predetermined portion on the vehicle outer side of the hub wheel 1, thereby causing double row rolling. A required preload is applied to the bearing 3. The caulking portion is denoted by reference numeral 13.

By the way, the hollow hole T of the hub wheel 1 is
The cross-sectional shape in the axial direction is circular in the entire axial range.

The above-mentioned caulking is performed on the large-diameter portion of the different-diameter portion 40, which is formed on the vehicle outer side from the end of the hollow hole T and has a plurality of large-diameter portions partially formed in the circumferential direction. The part 13 is made to bite.

That is, as shown in FIG. 1 and FIG.
A constant velocity joint 2 on the end surface of the hub wheel 1 on the vehicle inner side.
In the state where the shaft portion 25 is fitted in the hollow hole T with the small diameter side portion of the shaft abutting, the plastic deformation while performing the rolling caulking by the caulking jig so as to expand the vehicle outer side end portion of the shaft portion 25. Then, the caulking portion 13 is made to bite into the large diameter portion of the different diameter portion 40 of the hub wheel 1 to fix the rotational power to the hub wheel 1 in a transmissible manner.

More specifically, the hub wheel 1 is formed from a cylindrical body by forging. Further, in the hub wheel 1, the inner peripheral diameter is set larger on the vehicle outer side than the hollow hole T into which the shaft portion 25 is fitted.

The inner peripheral surface is formed with irregularities forming ridges and valleys in the radial direction around the circumference of a constant circumference diameter, and therefore, it does not form a circumference surface of constant inner diameter, but as shown in FIG. The inner peripheral surface in the axial direction has a wavy different diameter portion 40 structure.

As described above, the caulked portion 13 is formed by plastically working the tip portion of the shaft portion 25 so as to expand the diameter.
Are deformed according to the different-diameter-shaped portions of the different-diameter portion 40. The caulked portion 13 bites into the different diameter portion 40 with the caulking, so that the caulked portion 13 is in a fitted state where they are fitted to each other.

As a result, when the shaft portion 25 rotates, torque is transmitted through the different diameter portion 40 and the hub wheel 1 also rotates integrally.

Further, in the case of this embodiment, since the caulking portion 13 has a large wall thickness in the radial direction, it has sufficient strength to withstand torque transmission, and the caulking portion 13 has a large thickness. Problems such as axial deformation can be avoided. Further, since it is not necessary to form the spline along the axial direction, the manufacturing cost can be reduced.

Therefore, the structure is simple and the cost can be reduced without the need for reinforcement such as welding of the hub wheel 1 and the shaft portion 25.

The present invention is not limited to the above-described embodiment, and various applications and modifications such as those shown below are conceivable.

(1) FIG. 3 shows an axle bearing device according to another embodiment. Note that the same reference numerals are given to the same structures as those in the above-described embodiments.

The axle bearing device shown in the figure is a hub wheel 1.
And a constant velocity joint 2 and a double row rolling bearing 3, and is used for supporting the drive wheels.

The hub wheel 1 has a hollow structure, and a radially outward flange 11 is formed on the outer peripheral surface of the hub wheel 1 on the vehicle outer side. The area on the vehicle inner side of the flange 11 on the outer peripheral surface of the hub wheel 1 is
In the double row rolling bearing 3 described below, the inner ring raceway surface 12 of the group of balls 32 on the vehicle outer side is formed. A disc rotor (not shown) and wheels (not shown) of the disc brake device are applied to the flange 11 and attached by a plurality of bolts 5.

The constant velocity joint 2 uses a well-known Rzeppa-type CVJ (Constant Velocity Joint), and is provided with a bowl-shaped outer ring 21, an inner ring 22, a plurality of balls 23, a cage 24, and the like. A shaft portion 25 is integrally formed on the small diameter side of the bowl-shaped outer ring 21 in a protruding state.
It should be noted that the axle shaft 6 is spline-fitted to the inner ring 22 and fixed by a retaining ring (reference numeral omitted) or the like. Although not shown, the other end of the axle shaft 6 is attached to a differential device of the vehicle through another constant velocity joint.

The double-row rolling bearing 3 includes a single outer ring 31 having two rows of raceway grooves, a plurality of balls 32 as rolling elements arranged in two rows, and two crown-shaped cages 33. I have it. Then, the inner ring raceway surface 12 of 32 rows of balls on the vehicle outer side
Is provided on the hub wheel 1 as described above, and the inner ring raceway surface 26 of the 32 rows of balls on the vehicle inner side is provided on the inner ring member 4.

A radially outward flange 34 is provided at an axial center of the outer peripheral surface of the outer ring 31, and the flange 34 is bolted (not shown) to a knuckle (not shown) which is a part of the vehicle body. Can be installed with.

Next, an assembling form of each of the above components will be described.

First, while inserting the shaft portion 25 of the constant velocity joint 2 into the center hole T of the hub wheel 1 from the vehicle inner side, the double row rolling bearing 3 is mounted on the outer periphery of the hub wheel 1. At this time, the main body portion of the bowl-shaped outer ring 21 provided in the constant velocity joint 2 is arranged axially adjacent to the hub wheel 1 and abuts against the inner ring 4.

After this, the shaft portion 25 of the constant velocity joint 2 is previously prepared.
In this case, the end of the cylindrical portion provided on the free end side of the hub wheel is bent outwardly in a radial direction by a jig, and in this case, the end portion of the cylindrical portion is bent and caulked to a predetermined portion on the vehicle outer side of the hub wheel 1, thereby causing double row rolling. A required preload is applied to the bearing 3. The caulking portion is denoted by reference numeral 13.

By the way, the hollow hole T of the hub wheel 1 is
The cross-sectional shape in the axial direction is circular in almost the entire axial direction.

The above-mentioned caulking is performed so that the caulking portion 13 bites into the different diameter portion 40 formed on the vehicle outer side from the end of the hollow hole T.

That is, as shown in FIG. 3, the small-diameter side portion of the constant velocity joint 2 is in contact with the inner ring member 4 disposed at the vehicle inner side end of the hub wheel 1 and the hollow hole T is formed.
When the shaft portion 25 is fitted to the shaft portion 25, it is plastically deformed while rolling crimping is performed by a crimping jig so as to expand the vehicle outer side end portion of the shaft portion 25, and the crimped portion is deformed to the different diameter portion 40 of the hub wheel 1. 13 is bited into and fixed to the hub wheel 1 so that rotational power can be transmitted.

More specifically, the hub wheel 1 is formed from a cylindrical body by forging. Further, in the hub wheel 1, the inner peripheral diameter is set larger on the vehicle outer side than the hollow hole T into which the shaft portion 25 is fitted.

The inner peripheral surface is formed with irregularities that form ridges and valleys in the radial direction around the circumference of a constant circumference diameter. Therefore, instead of forming a circumference surface of a constant inner diameter, the inner circumference surface is not seen. The peripheral surface forms a different diameter portion 40 structure having a wavy shape.

As described above, the caulked portion 13 is formed by plastically working so that the tip portion of the shaft portion 25 is expanded in diameter.
Are deformed according to the different-diameter-shaped portions of the different-diameter portion 40. The caulked portion 13 bites into the different diameter portion 40 with the caulking, so that the caulked portion 13 is in a fitted state where they are fitted to each other.

As a result, when the shaft portion 25 rotates, torque is transmitted through the different diameter portion 40 and the hub wheel 1 also rotates integrally.

Further, in the case of this embodiment, since the caulked portion 13 has a large wall thickness in the radial direction, the caulked portion 13 has sufficient strength to transmit torque, and the caulked portion 13 has a large thickness. Problems such as axial deformation can be avoided. Further, since it is not necessary to form the spline along the axial direction, the manufacturing cost can be reduced.

(2) FIG. 4 shows an axle bearing device according to another embodiment. Note that the same reference numerals are given to the same structures as those in the above-described embodiments.

The bearing device for an axle of the illustrated example is a hub wheel 1.
And a constant velocity joint 2 and a double row rolling bearing 3, and is used for supporting the drive wheels.

The hub wheel 1 has a hollow structure, and a radially outward flange 11 is formed on the outer peripheral surface of the hub wheel 1 on the vehicle outer side. The area on the vehicle inner side of the flange 11 on the outer peripheral surface of the hub wheel 1 is
In the double row rolling bearing 3 described below, the inner ring raceway surface 12 of the group of balls 32 on the vehicle outer side is formed. A disc rotor (not shown) and wheels (not shown) of the disc brake device are applied to the flange 11 and attached by a plurality of bolts (not shown).

The constant velocity joint 2 uses a well-known Rzeppa type CVJ (Constant Velocity Joint), and is provided with a bowl-shaped outer ring 21, an inner ring 22, a plurality of balls 23, a cage 24, and the like. On the small diameter side of the bowl-shaped outer ring 21, a shaft portion 25 is integrally formed in a protruding state,
The boundary portion between the bowl-shaped outer ring 21 and the shaft portion 25 has an inner ring raceway surface 2 of the group of balls 32 on the vehicle inner side in the double row rolling bearing 3 described below.
It is assumed to be 6. The axle shaft 6 is spline-fitted to the inner ring 22 and is retained by a retaining ring 28 or the like. Although not shown, the other end of the axle shaft 6 is attached to a differential device of the vehicle through another constant velocity joint.

The double-row rolling bearing 3 has a single outer ring 31 having two rows of raceway grooves, a plurality of balls 32 as rolling elements arranged in two rows, and two crown-shaped cages 33. The inner ring 7 is provided with a raceway surface 12 for the vehicle outer side balls 22 and the inner race 4 is provided with a raceway surface 26 for the vehicle inner side balls 22 group.

The inner rings 4 and 7 are fitted onto the shaft portion 25 of the constant velocity joint 2 in parallel with each other, and are sandwiched between the end face of the bowl-shaped portion 35 of the constant velocity joint 2 and the end face of the hub wheel 1 on the vehicle inner side. At the same time, the axial position is regulated.

The inner raceway surface 12 of the hub wheel 1 and the inner raceway surface 26 of the bowl-shaped outer race 21 of the constant velocity joint 2 are configured as inner races. A radially outward flange 34 is provided at an axial center of the outer peripheral surface of the outer ring 31, and the flange 34 is attached to a knuckle (not shown) that is a part of the vehicle body by a bolt (not shown). .

Next, an assembling form of each of the above components will be described.

First, the double-row rolling bearing 3 is mounted on the outer periphery of the shaft portion 25 of the constant velocity joint 2, and the shaft portion 2 is kept in this state.
5 is inserted into the center hole T of the hub wheel 1 from the vehicle inner side. The center hole T and the shaft portion 25 are not provided with a coupling structure such as spline or serration.

After this, the shaft portion 25 of the constant velocity joint 2 is previously prepared.
In this case, the end of the cylindrical portion provided on the free end side of the hub wheel is bent outwardly in a radial direction by a jig, and in this case, the end portion of the cylindrical portion is bent and caulked to a predetermined portion on the vehicle outer side of the hub wheel 1, thereby causing double row rolling. A required preload is applied to the bearing 3. The caulking portion is denoted by reference numeral 13.

The caulking described above is performed so that the caulking portion 13 bites into the different diameter portion 40 formed on the vehicle outer side from the end of the hollow hole T.

That is, as shown in FIG. 4, the inner ring 7 of the double-row rolling bearing 3 is in contact with the end surface of the hub wheel 1 on the vehicle inner side, and the small diameter side portion of the constant velocity joint 2 is the inner ring of the double-row rolling bearing 3. 4 is in contact with the outer side end of the shaft portion 25 on the outer side of the vehicle, the rolling caulking is performed by a caulking jig so as to plastically deform the caulking portion 13 of the hub wheel 1. The rotational power is fixed to the hub wheel 1 so that it can be transmitted.

More specifically, the hub wheel 1 is formed from a cylindrical body by forging. Further, in the hub wheel 1, the inner peripheral diameter is set larger on the vehicle outer side than the hollow hole T into which the shaft portion 25 is fitted.

The inner peripheral surface is formed with irregularities which form ridges and valleys in the radial direction around the circumference of a constant peripheral diameter. Therefore, the inner peripheral surface does not form a constant inner peripheral surface, but the inner peripheral surface as viewed in the axial direction. The peripheral surface forms a different-diameter portion 40 structure having a wavy shape.

As described above, the caulked portion 13 is formed by plastically working so that the tip portion of the shaft portion 25 is expanded in diameter.
Are deformed according to the different-diameter-shaped portions of the different-diameter portion 40. The caulked portion 13 bites into the different diameter portion 40 with the caulking, so that the caulked portion 13 is in a fitted state where they are fitted to each other.

As a result, when the shaft portion 25 rotates, torque is transmitted through the different diameter portion 40 and the hub wheel 1 also rotates integrally.

Further, in the case of this embodiment, since the caulking portion 13 has a large thickness in the radial direction, it has sufficient strength to withstand torque transmission, and the caulking portion 13 has a large thickness. Problems such as axial deformation can be avoided. Further, since it is not necessary to form the spline along the axial direction, the manufacturing cost can be reduced.

(3) FIG. 5 shows an axle bearing device according to another embodiment. Note that the same reference numerals are given to the same structures as those in the above-described embodiments.

The bearing device for an axle of the illustrated example has a hub wheel 1
And a constant velocity joint 2 and a double row rolling bearing 3, and is used for supporting the drive wheels.

The hub wheel 1 has a solid shaft structure, and a radially outward flange 11 is formed at an axially intermediate portion of the outer peripheral surface thereof.

On the outer peripheral surface of the hub wheel 1, a region closer to the vehicle inner side than the flange 11 is an inner ring raceway surface 1 of the group of balls 32 on the vehicle outer side in the double row rolling bearing 3 described below.
2 A disc rotor (not shown) and wheels (not shown) of the disc brake device are applied to the flange 11 and attached by a plurality of bolts 5.

The constant velocity joint 2 is called a well-known Rzeppa type (Burfield type) constant velocity joint, and is composed of a bowl-shaped outer ring 21, an inner ring 22, balls 23, a cage 24 and the like.

The bowl-shaped outer ring 31 corresponds to the input shaft and constitutes a bowl-shaped portion 35 in which the inner ring 32, the balls 33, the cage 34 and the like are housed and arranged, and the bowl-shaped portion is formed. The reference numeral 35 forms a hollow hole T penetrating along the axial direction on the vehicle outer side.

In the hollow hole T, the shaft portion 1a of the hub wheel 1 is
Is fitted, and the bowl-shaped outer ring 31 and the hub wheel 1 are integrally rotated by coupling the shaft portion 1a to the bowl-shaped outer ring 21 to be described later. It should be noted that the axle shaft 6 is spline-fitted to the inner ring 22 and fixed by a retaining ring (reference numeral omitted) or the like. Although not shown, the other end of the axle shaft 6 is attached to a differential device of the vehicle through another constant velocity joint.

The double row rolling bearing 3 is an oblique type (angular) type double row rolling ball bearing mounted on the outer peripheral surface of the hub wheel 1, and has a single outer ring 31 having two rows of raceway grooves.
And a plurality of balls 32 as rolling elements arranged in two rows,
Inner ring 4 having two crown-shaped cages 33, an outer peripheral surface of the hub wheel 1 including the raceway surface 12 for the vehicle outer side balls 32, and a raceway surface 26 for the vehicle inner side balls 32 group.
It consists of and.

A radially outward flange 34 is provided at an axial center of the outer peripheral surface of the outer ring 31, and the flange 34 is bolted (not shown) to a knuckle (not shown) which is a part of the vehicle body. Can be installed with.

Next, an assembling form of each of the above components will be described.

First, the shaft portion 1a of the hub wheel 1 having the double row rolling bearing 3 previously provided on the outer periphery thereof is attached to the central hole T of the bowl-shaped outer ring 21.
Is inserted from the vehicle outer side, and the inner ring 4 of the double-row rolling bearing 3 is brought into contact with the vehicle outer side end surface of the bowl-shaped outer ring 21.

Thereafter, the end portion of the cylindrical portion previously provided on the free end side of the shaft portion 1a of the hub wheel 1 is bent outward in the radial direction by a jig so that the end portion of the cylindrical portion is bent and the vehicle outer portion of the hub wheel 1 is bent. By caulking the side predetermined portion, a required preload is applied to the double row rolling bearing 3. The caulking portion is denoted by reference numeral 13.

By the way, the shaft portion 1a of the hub wheel 1
The center hole T of the bowl-shaped outer ring 21 does not include a spline structure or a serration structure that fit together.

The caulking described above is performed so that the caulking portion 13 bites into the different diameter portion 40 formed on the vehicle inner side from the end of the hollow hole T.

That is, the bowl-shaped outer ring 31 is formed from a cylindrical body by forging. The inner diameter of the hollow hole T on the vehicle inner side of the portion where the small diameter shaft portion 1a of the hub wheel 1 is fitted is set to be larger than that of the portion where the small diameter shaft portion 1a is fitted.

Further, on the inner circumference thereof, there are formed irregularities which form ridges and valleys in the radial direction with a circle having a constant circumference as the center,
Therefore, it does not form a circumferential surface having a constant inner diameter, but forms a different diameter portion 40 structure in which the inner circumferential surface shape in the axial direction is wavy.

As described above, the caulked portion 13 is made to match the different diameter shaped portion of the different diameter portion 40 by plastically working so that the tip portion of the small diameter shaft portion 1a of the hub wheel 1 is expanded. Be transformed. The caulked portions 13 are engaged with each other by biting into the different diameter portion 40 along with the caulking.

As a result, when the bowl-shaped portion 35 rotates, the torque is transmitted through the different diameter portion 40, and the hub wheel 1 also receives the rotational power.

Further, since the caulking has a large wall thickness in the radial direction, it has sufficient strength to withstand torque transmission and also has a problem that the caulking portion is deformed in the axial direction. It can be avoided. Further, since it is not necessary to form the spline along the axial direction, the manufacturing cost can be reduced.

In each of the above-described embodiments, the different diameter portion has a different diameter structure in which a wavy shape is drawn in the circumferential direction as shown in FIG. 2, but only a part of the circumference is radially outside like a key groove. It may have a different diameter structure that is concave.

Further, it is preferable that the different-diameter portion is one that can be easily formed by forging and can sufficiently engage the portion plastically deformed by caulking.

In the above embodiment, the caulking is performed while the jig is rolled while the jig is rolled. However, the conical jig is attached to the cylindrical portion of the member to be caulked in the axial direction. You may crimp by pressing.

[0097]

According to the inventions of claims 1 to 7, in order to integrally couple the hub wheel and the input shaft to each other, one member of the hub wheel and the input shaft is formed in the hollow hole of the other member. In the state of being internally fitted, the end portion of the one member that is to be fitted is crimped to the large diameter portion of the different diameter portion formed on the other member, and the crimped portion is bitten into the large diameter portion of the different diameter portion. Therefore, there is an effect that processing and the like are easier than forming a spline as in the related art.

Further, since the fitting of the large-diameter portion of the different-diameter portion and the caulking portion by biting is fitted in the circumferential direction and the axial direction, the fitting is performed in the radial direction even if an external force acts. It is less likely that the caulking will be loosened, and the caulking will be restrained from being loosened in the axial direction.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an axle bearing device according to an embodiment of the present invention.

FIG. 2 is a front view of the axle bearing device of FIG. 1 as viewed from the vehicle outer side.

FIG. 3 is a vertical sectional side view of an axle bearing device according to another embodiment of the present invention.

FIG. 4 is a vertical sectional side view of an axle bearing device according to still another embodiment of the present invention.

FIG. 5 is a vertical sectional side view of an axle bearing device according to yet another embodiment of the present invention.

[Explanation of symbols]

1 hub wheel 2 constant velocity joint 3 Double row rolling bearing 25 Shaft (input shaft) 40 Different diameter part T hollow hole

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Claims (7)

[Claims] 1. A hub wheel to which a wheel is attached, an input shaft fitted to the hub wheel to transmit rotational power, and arranged on the outer periphery of the hub wheel so that the hub wheel is rotatable with respect to a vehicle body. A bearing device for an axle comprising a rolling bearing supported on, wherein one member of the hub wheel and the input shaft is fitted into a hollow hole of the other member, and the one end portion of the hollow hole of the other member. A different-diameter portion that partially forms a plurality of large-diameter portions in the circumferential direction is provided, and a cylindrical portion is provided at one end of the fitting portion of the one member, and the cylindrical portion is radially outward. By being expanded,
The expanded diameter portion is crimped so as to bite into the large diameter portion of the different diameter portion, and the both diameters of the different diameter portion and the expanded diameter portion cause the two members to circumferentially and axially move. A bearing device for an axle, wherein the bearing device is integrally coupled in a direction. 2. A hub wheel to which a wheel is attached, an input shaft fitted to the hub wheel for transmitting rotational power, and arranged on the outer periphery of the hub wheel so that the hub wheel is rotatable with respect to the vehicle body. A bearing device for an axle, comprising: a rolling bearing supported on the input shaft, wherein the input shaft is fitted into a hollow hole of the hub wheel; Is provided with a different-diameter portion that is partially formed, and a cylindrical portion is provided at one end of the fitting portion in the input shaft, and by expanding the cylindrical portion radially outward,
The enlarged diameter portion is caulked in such a manner as to bite into the large diameter portion of the different diameter portion, and the large diameter portion of the different diameter portion and the enlarged diameter portion bite into the input shaft and the hub wheel. A bearing device for an axle, wherein the bearing is integrally connected in the circumferential direction and the axial direction. 3. A hub wheel to which a wheel is attached, an input shaft fitted to the hub wheel for transmitting rotational power, and arranged on the outer periphery of the hub wheel so that the hub wheel is rotatable with respect to the vehicle body. A bearing device for an axle, comprising: Is provided with a different-diameter portion that is partially formed, and a cylindrical portion is provided at one end of the fitting portion in the hub wheel, and by expanding the cylindrical portion radially outward,
The enlarged diameter portion is caulked in such a manner as to bite into the large diameter portion of the different diameter portion, and the large diameter portion of the different diameter portion and the enlarged diameter portion bite into the input shaft and the hub wheel. A bearing device for an axle, wherein the bearing is integrally connected in the circumferential direction and the axial direction. 4. The bearing device for an axle according to claim 2, wherein the input shaft is a shaft portion of a constant velocity joint. 5. The axle bearing device according to claim 3, wherein the input shaft is a bowl-shaped portion that constitutes a constant velocity joint. 6. The bearing device for an axle according to claim 2 or 4, wherein the different diameter portion of the hub wheel is formed by forging. 7. The axle bearing device according to claim 3, wherein the different diameter portion of the input shaft is formed by forging.