JP2002206538A - Bearing device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the service life of a bearing by making shapes of raceway track parts of an inner ring and an outer ring proper after caulking a shaft end of a hub wheel in a bearing device for a vehicle. SOLUTION: A double row tapered roller bearing with vertex of contact angles outside of bearing 2 is externally fitted in outer periphery of the hub wheel 1 to which a wheel is attached. The shaft end of the hub wheel is deformed outward in the radial direction and is caulked on an external end face of the inner ring 23 provided in the bearing. The raceway track part in at least either of the inner ring 23 and the outer ring 21 of the bearing is designed so as to satisfy the condition for ensuring a predetermined shape while it is elastically deformed by caulking. Consequently, satisfactory rolling performance of the tapered roller 22 after caulking is ensured, and predetermined service life of the tapered roller as the bearing device after caulking is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hub unit and other vehicle bearing devices to which a disk rotor and wheels of a disk brake device are mounted, and more particularly to a vehicle bearing device having a double row outward tapered roller bearing. .

[0002]

2. Description of the Related Art Double row outward tapered roller bearings are generally used to receive large radial loads, axial loads, and moment loads from a heavy vehicle body.

In a vehicle bearing device provided with such a bearing, the bearing is fitted around the outer periphery of a hub wheel to which the wheel is attached, and the shaft end of the hub wheel is deformed radially outward. There is a structure in which the bearing is caulked to the outer end surface of one inner ring of the bearing.

In order to maintain the rolling performance of the inner and outer races of the tapered rollers with respect to the rolling surfaces, as shown in FIG. An extension line along the rolling surfaces 23a, 21a of the one-side inner ring 23 and the outer ring 21 with respect to L, and a tapered roller 22
The extension line along the outer peripheral surface of the hub wheel is the rotation axis L of the hub wheel.
It is designed to match at one point Q above.

In this case, θ1 is the orbital angle of the inner ring 23 with respect to the rotation axis L, and θ2 is the outer ring 2 with respect to the rotation axis L.
The orbit angle of 1, θ3, is the angle of the inner wall surface 23c of the large flange portion 23b bulging radially outward on the large diameter side of the inner ring 23. Reference numeral 3 denotes a swaged portion formed by the shaft end of the hub wheel.

The orbit angles θ1, θ2 and the inner wall angle θ3 have the same design for the other inner ring and outer ring (not shown), respectively. It is designed to correspond to the inner wall angle.

In the above conventional case, when the hub wheel shaft end is bent radially outward and crimped to the outer end surface of the inner ring 23, the shapes of the rolling surfaces 23a, 21a and the large flange portion 23b of the inner and outer rings are formed. Are elastically deformed, so that the orbit angles θ1, θ2 and the inner wall surface 23, which are specified to the originally required angles,
The angle θ3 of c may change.

In this case, the contact state of the tapered rollers with the rolling surface or the inner wall surface becomes unstable, which affects the life of the bearing device.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle bearing device capable of improving the bearing life by caulking the shaft end of the hub wheel and then optimizing the shape of the raceway portion of the inner and outer rings. It is to provide.

[0010] Other objects, features, and advantages of the present invention will be apparent from the following description.

[0011]

A vehicle bearing device according to the present invention comprises a hub wheel to which wheels are mounted, and a double row outward tapered roller bearing mounted on an outer periphery of the hub wheel. The shaft end of the wheel is deformed radially outward and is caulked against the outer end surface of the inner ring provided in the tapered roller bearing, and the tapered roller bearing has an inner ring and an outer ring whose rolling surfaces are tapered. And a tapered roller arranged between the rolling surface of the inner ring and the rolling surface of the outer ring, and the shape of the raceway portion in at least one of the inner ring and the outer ring is elastically deformed by the caulking. It is designed so as to satisfy a condition for securing a predetermined shape in a state where it is made to be made.

In this design, even if the shaft end of the hub wheel is bent radially outward and crimped to the outer end surface of the inner ring, the angle of the raceway portion of the inner / outer ring after the crimping, for example, of the inner ring or the outer ring. The rolling surface angle can be secured to the specified angle originally required. As a result, good rolling performance of the tapered rollers can be ensured, and the bearing can be designed to have a shape that can be balanced with the races of the inner and outer rings, and the expected life of the bearing device after swaging is ensured. be able to.

Preferably, the present invention is characterized in that the condition is such that at least one of the inner ring and the outer ring has a shape of a raceway portion before caulking, and an extended line along the one rolling surface after the caulking, and The extension line along the outer peripheral surface of the tapered rollers is set so as to match on the rotation axis of the hub wheel.

In the present invention, preferably, the condition is that the shape of the raceway portion before the caulking of the inner ring and the outer ring is changed after the caulking, by the extension line along the rolling surface of each of the outer ring and the inner ring and the tapered roller. This is to set an extension line along the outer peripheral surface to coincide with the rotation axis of the hub wheel.

In the present invention, preferably, the condition is that the rolling surface angle before the caulking of the inner ring is changed from the rolling surface angle at which the raceway portion of the inner ring is secured to a required shape, This is to set the angle to a value reduced by the surface angle.

In the present invention, preferably, the condition is that a rolling surface angle of the outer ring before caulking is determined from a rolling surface angle at which a raceway portion of the outer ring is secured to a required shape. This is to set an angle that is increased by the variable rolling surface angle.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle bearing device according to the present invention will be described as applied to an automobile. This bearing device is not limited to an automobile, but can be similarly applied to other vehicles such as a railway vehicle.

Referring to FIGS. 1 to 3, reference numeral A indicates the entirety of a vehicle bearing device of the type used on the driven wheel side of an automobile.

The hub wheel 1 has a radially outwardly directed annular flange 1 on which a wheel (not shown) is mounted on the vehicle outer side.
One. The double row outward tapered roller bearing 2 is fitted around the outer periphery of the hub wheel 1 on the vehicle inner side.

The bearing 2 has a single outer ring 21 having two rows of rolling surfaces 21a and 21b adjacent to each other in the axial direction, and a plurality of tapered rollers 22 arranged on the two rows of rolling surfaces 21a and 21b. And an inner ring 23 having a single rolling surface 23a as a pair with a rolling surface 21a on the vehicle inner side of the outer wheel 21 and being fitted to the outer peripheral surface of the hub wheel 1. Of the outer peripheral surface of the outer race 21 as a pair with the rolling surface 21b on the vehicle outer side. 25 is a retainer.

The inner raceway 21a of the outer race 21
Has a tapered shape having a large diameter toward the shaft end of the hub wheel 1 on the vehicle inner side.
1b has a tapered shape having a large diameter toward the shaft end of the hub wheel 1 on the vehicle outer side.

The rolling surface 23a of the inner race 23 has a tapered shape having a larger diameter toward the shaft end of the hub wheel 1 on the vehicle inner side. A large flange 23b bulging outward is formed.

The raceway of the inner race 23 is composed of the tapered rolling surface 23a and the inner wall surface 23c of the large flange 23b.

The vehicle inner side of the hub wheel 1 is
The inner end of the vehicle is bent radially outward and is caulked to the outer end surface of the inner ring 23 of the bearing 2 to form a caulked portion 3.

A radially outward flange 24 is provided on the outer periphery of the outer race 21. The outer race 21 is non-rotatably attached to an axle case (not shown) via the flange 24.

The raceway portions of the inner ring 23 and the outer ring 21 of the bearing 2 are designed to satisfy the condition of securing a predetermined shape in a state where they are elastically deformed by the caulking.

This design will be described with reference to FIG. FIG. 3 is exaggerated for easy understanding.

The shapes of the inner ring 23, the outer ring 21 and the inner wall surface 23c are basically the same as the shapes (solid line shapes) of the orbital portions of the inner ring 23 and the outer ring 21 and the inner wall surface 23c of the large flange 23, respectively. In consideration of elastic deformation due to caulking, it is designed to have a predetermined shape (virtual line shape) different from the solid line shape before caulking.

In order to obtain this design shape, the amount of change according to the caulking load for each dimension of the bearing device for a vehicle is examined by experiment, and is set by empirically grasping.

The details will be described below. First, θ1a, θ
2a and θ3a are the angles of the shaft end of the hub wheel 1 before caulking, and the respective raceway portions of the inner ring 23 and the outer ring 21 are designed to secure shapes based on the angles before caulking.

Further, θ1, θ2, and θ3 are angles after caulking, respectively, and are angles at which the respective track portions of the inner ring 23 and the outer ring 21 are secured to the originally required shapes.

Here, θ1a and θ1 are the rolling surface angles of the inner ring 23 with respect to the rotation axis L of the hub wheel 1, θ2a and θ2, respectively.
2 is a rolling surface angle of the outer ring 21 with respect to the rotation axis L of the hub wheel 1, and θ3a and θ3 are inner wall surfaces 2 of the large flange portion 23b.
3c is the inclination angle with respect to the radial direction.

As a result of the experiment, the rolling surface angle before caulking the inner race 23 increased after caulking and increased from θ1a to θ1.
In addition, the rolling surface angle of the outer ring 21 before caulking does not change after caulking (θ2a = θ2).

The inclination angle of the inner wall surface 23c of the large flange portion 23 before caulking becomes small after caulking, and becomes smaller from θ3a to θ3a.
It turned out to be 3.

Here, the reason why the inclination angle of the inner wall surface 23c of the large collar portion 23 is reduced by caulking and changes from θ3a to θ3 is that the rolling surface angle θ1a before the inner ring 23 is caulked.
However, it becomes larger due to caulking, becomes θ1 after caulking, and since the rolling surface angle θ2a of the outer ring 21 does not change before and after caulking, the tapered rollers 22 work to press the large brim portion 23 by a wedge effect. That's why.

The inner ring 23, the outer ring 21,
Inner wall surface 23c, the respective change angles are △ θ1, △ θ2,
Δθ3.

Rolling surface angle θ before caulking of inner ring 23
1a is set to an angle θ1a (= θ1−Δθ1) obtained by subtracting the rolling surface angle variation △ θ1 from the rolling surface angle θ1 at which the raceway portion of the inner ring 23 is originally formed in a required shape.

The inclination angle θ3a before caulking of the inner wall surface 23c of the large flange portion 23 is obtained by increasing the variable inclination angle Δθ3 by caulking from the inclination angle θ3 at which the inner wall surface 23c is originally required to have the required shape. (= Θ3 + △ θ3)
Set to.

With the above setting, in the case of the rolling surface angle of the inner race 23, the angle is θ1 after caulking from θ1a before caulking, and in the case of the inclination angle of the inner wall surface 23c, the angle is θ3 after caulking before θ3a.

As a result, after caulking, as shown in FIG. 3, extension lines L1 and L2 along the rolling surfaces of the inner ring 23 and the outer ring 21 with respect to the rotation axis L of the hub wheel 1 and the outer periphery of the tapered roller 22 are formed. The extension along the surface coincides with one point Q on the rotation axis L, and the shapes of the rolling surface and the inner wall surface 23c of the inner ring 23 and the outer ring 21 are optimized, and the contact of the tapered rollers 22 with them. The condition is stable and the bearing life is improved.

In the above-described embodiment, the rolling surface angle θ1a of the inner race 23 and the inclination angle θ3a of the inner wall surface 23c are expected to be elastically deformed by caulking with respect to the originally required shape (solid line shape). Prior to caulking, the design is made to have a predetermined shape (virtual line shape) different from the solid line shape, but the above-mentioned design may be performed for the raceway portion shape of the outer ring 21.

In the case where the outer ring 21 is used, the rolling surface angle of the inner ring 23 is fixed to θ1, as shown in FIG.
Of the rolling surface angle θ2a ′ (= θ2 + △ θ), which is obtained by increasing the rolling surface angle variation Δθ1 of the inner ring 23 from the rolling surface angle θ2 in which the raceway portion of the outer ring 21 is previously secured in the originally required shape.
It is preferable to set 1) so that the deformation of the rolling surface angle of the inner race 23 can be absorbed by the outer race 21.

Since △ θ3 is generated because θ2a = θ2 with respect to the occurrence of △ θ1, △ θ3 ≒ 0 by setting θ2a ′.

Further, the above-mentioned design may be performed for the raceway portions of both the inner ring 23 and the outer ring 21. In this case, the rolling surface angle variation Δ of the inner ring 23 due to caulking Δ
θ1 is assigned to each of the rolling surface angles of the inner wheel 23 and the outer wheel 21.

In the above-described embodiment, one of the two inner rings in the tapered roller bearing 2 is the inner ring 23 itself, while the other inner ring occupies a required area of the outer peripheral surface of the hub wheel 1 with the outer ring 21. Rolling surface 21a on the outer side of the vehicle
And a pair of rolling surfaces 12a are used.

On the other hand, the present invention can be applied to a tapered roller bearing 2 as shown in FIG. 5 in which both inner rings 23, 23 are provided on the vehicle outer side and the vehicle inner side.

That is, also in the case of the vehicle bearing device of FIG. 5, the raceway portion of at least one of the outer ring 21 and the vehicle inner side inner ring 23 in the tapered roller bearing 2 has a predetermined shape in a state where it is elastically deformed by caulking. It is designed to meet the requirements. The conditions can be determined in the same manner as in the embodiment shown in FIGS.

The bearing device for a vehicle in the above-described embodiment is on the driven wheel side of the vehicle, but may be on the driving wheel side as shown in FIG.

The vehicle bearing device shown in FIG. 6 has a constant velocity joint 3 in addition to the hub wheel 1 and the double row outward tapered roller bearing 2.

The hub wheel 1 has a center hole 1a.

The constant velocity joint 3 is, for example, a so-called zeppa type (Barfield type) constant velocity joint, and is composed of an outer ring 31, an inner ring 32, a ball 33, a retainer 34 and the like.

The outer ring 31 is composed of a bowl-shaped tubular portion 35 in which the inner ring 32, the ball 33, the retainer 34 and the like are housed and arranged, and a shaft portion 36 integrally connected to the small-diameter side of the bowl-shaped tubular portion 35. It is configured.

One end of a shaft (drive shaft) 7 is spline-fitted to the inner ring 32 and is fixed by a retaining ring (omitted by a reference numeral) or the like, and the other end of the shaft 7 is connected to another constant velocity (not shown). It is attached to a differential device of a vehicle via a joint.

A double row outward tapered roller bearing 2 is mounted on the outer peripheral surface of the hub wheel 1 and a constant velocity joint is provided in a state where the double row outward tapered roller bearing 2 is close to the center hole 1a of the hub wheel 1. 3 is attached so as to be integrally rotatable with the hub wheel 1.

Further, bolts 13 for fixing a disk rotor and wheels (not shown) of the disk brake device are mounted in several places on the circumference of the flange 11 in a penetrating state.

In such a vehicle hub unit, the rotational power of the shaft 7 is transmitted to wheels (not shown) attached to the hub wheel 1 via the constant velocity joint 3.

In the embodiment shown in FIG. 6, the double row outward tapered roller bearing 2 also satisfies the condition for securing a predetermined shape in a state where the raceway portions of the inner ring 23 and the outer ring 21 are elastically deformed by caulking. It is designed to be. The conditions can be determined in the same manner as in the embodiment shown in FIGS.

[0058]

As described above, in the case of the present invention, the hub wheel to which the wheel is attached, and the double row outward tapered roller bearing mounted on the outer periphery of the hub wheel, the shaft end of the hub wheel. Is deformed radially outward and is caulked against the outer end surface of the inner ring provided in the tapered roller bearing, wherein the tapered roller bearing has an inner ring and an outer ring whose rolling surfaces are tapered, and the inner ring Having a tapered roller arranged between the rolling surface of the outer ring and the rolling surface of the outer ring, the shape of the raceway portion in at least one of the inner ring and the outer ring,
Since it is designed to satisfy the condition to secure a predetermined shape in the state of being elastically deformed by the caulking, even if the shaft end of the hub wheel is bent and deformed radially outward to the outer end surface of the inner ring, it is caulked. The angle of the raceway portion of the inner and outer rings after the caulking, for example, the angle of the rolling surface of the inner ring and the outer ring can be secured to the originally required specified angle. As a result, good rolling performance of the tapered rollers can be ensured, and the bearing can be designed to have a shape that can be balanced with the races of the inner and outer rings, and the expected life of the bearing device after swaging is ensured. be able to.

[Brief description of the drawings]

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

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is an explanatory view of the operation of the vehicle bearing device of FIG. 1;

FIG. 4 is another explanatory view of the operation of the vehicle bearing device of FIG. 1;

FIG. 5 is a longitudinal sectional side view of a vehicle bearing device according to another embodiment of the present invention.

FIG. 6 is a longitudinal sectional side view of a vehicle bearing device according to still another embodiment of the present invention.

FIG. 7 is an enlarged sectional view of a main part of a conventional hub unit.

[Explanation of symbols]

 Reference Signs List 1 hub wheel 2 double row outward tapered roller bearing 3 constant velocity joint 21 outer ring 23 inner ring 23b large flange portion 23c of inner ring 23c inner wall surface of large collar portion 23b

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadashi Mitarai 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Inside Koyo Seiko Co., Ltd. (72) Inventor Daisaku Tomita 3-5-8 Minamisenba, Chuo-ku, Osaka-shi F term in Seiko Co., Ltd. (reference) 3J017 AA01 AA02 DA01 DB08 3J101 AA12 AA16 AA25 AA32 AA43 AA54 AA62 BA52 BA53 FA31 GA03

Claims (10)

[Claims] 1. A hub wheel to which a wheel is attached; and a double row outward tapered roller bearing mounted on an outer periphery of the hub wheel, wherein an axial end of the hub wheel is deformed radially outward. The tapered roller bearing is caulked against an outer end surface of an inner ring provided in the tapered roller bearing, and the tapered roller bearing has a tapered inner ring and an outer ring, and a rolling surface of the inner ring and a rolling of the outer ring. A tapered roller arranged between the running surface and a condition for ensuring a predetermined shape in a state where the shape of the raceway portion in at least one of the inner ring and the outer ring is elastically deformed by the caulking. A vehicle bearing device designed to satisfy 2. The condition is such that at least one of the inner ring and the outer ring has a shape of a raceway portion before caulking, an extension line along the one rolling surface after the caulking, and an outer peripheral surface of the tapered roller. 2. The vehicle bearing device according to claim 1, wherein the extension line is set so as to coincide with the extension line along the axis of rotation of the hub wheel. 3. 3. The condition according to claim 1, wherein the shape of the raceway portion before caulking the inner ring and the outer ring is changed after the caulking, by the extension line along the rolling surface of each of the outer ring and the inner ring and the extension along the outer peripheral surface of the tapered roller. The vehicle bearing device according to claim 1, wherein the line is set so as to match the line on the rotation axis of the hub wheel. 4. The condition according to claim 1, wherein the rolling surface angle of the inner ring before caulking is reduced by a variable rolling surface angle due to the caulking from a rolling surface angle at which a track portion of the inner ring is secured to a required shape. The vehicle bearing device according to claim 1, wherein the angle is set to a predetermined angle. 5. The condition according to claim 1, wherein the rolling surface angle of the outer ring is increased by a varying rolling surface angle of the inner ring due to the caulking from a rolling surface angle at which a raceway portion of the outer ring is secured to a required shape. The vehicle bearing device according to claim 1, wherein the angle is set to a predetermined angle. 6. A hub wheel to which a wheel is attached, and a double row outward tapered roller bearing mounted on an outer periphery of the hub wheel, wherein an axial end of the hub wheel is deformed radially outward. The inner roller and the outer ring of the inner ring of the bearing are provided, and the tapered roller bearing has an inner ring and an outer ring having a tapered rolling surface, and a cone arranged between the inner ring and the outer ring. With the rollers, and having a large flange portion bulging radially outward on the large diameter side of the rolling surface of the inner ring, the raceway portion of the outer ring is a rolling surface of the outer ring The track portion of the inner ring is a rolling surface of the inner ring and an inner wall surface of the large collar portion. At least one of the shape of the track portion of the outer ring and the shape of the track portion of the inner ring is the shape Ensure a predetermined shape while being elastically deformed by caulking A vehicle bearing device designed to satisfy the following conditions. 7. The condition is that the rolling surface angle of the inner ring before the caulking is determined by a variable rolling surface angle due to the caulking from a rolling surface angle at which a track portion of the inner ring is secured to a required shape. Set to a reduced angle, and the inclination angle with respect to the radial direction of the inner wall surface of the large collar portion before the caulking,
7. The vehicle bearing device according to claim 6, wherein an angle obtained by increasing a variation inclination angle due to the caulking from the inclination angle after the caulking is set. 8. A hub wheel to which a wheel is attached, and a double row outward tapered roller bearing mounted on the outer periphery of the hub wheel, wherein the tapered roller bearings are arranged in two rows adjacent to each other in the axial direction. A single outer race having a rolling surface, a plurality of tapered rollers arranged in the two rows of rolling surfaces, and a single rolling surface forming a pair with a rolling surface of the outer race on the vehicle inner side. And an inner ring fitted to the vehicle inner side of the outer peripheral surface of the hub wheel,
And a required area of the outer peripheral surface of the hub wheel is used as a pair of rolling surfaces with the rolling surface of the outer ring on the vehicle outer side, and the vehicle inner side of the hub wheel has a hollow shape, The inner side of the vehicle is bent radially outward and caulked against the inner ring end face of the bearing, and the raceway portion of at least one of the inner ring and the outer ring of the tapered roller bearing is elastically deformed by the caulking. A vehicle bearing device designed to satisfy a condition for securing a predetermined shape in a let-down state. 9. A hub wheel to which a wheel is attached, and a double row outward tapered roller bearing mounted on the outer periphery of the hub wheel, wherein the tapered roller bearings are arranged in two rows adjacent to each other in the axial direction. A single outer wheel having a rolling surface, a vehicle inner inner wheel corresponding to a vehicle inner rolling surface of the outer wheel, a vehicle outer inner wheel corresponding to a vehicle outer rolling surface of the outer wheel, and the outer wheel; A plurality of tapered rollers arranged between the rolling surfaces of each of the inner rings, wherein a vehicle inner-side shaft end of the hub wheel is bent radially outward to the vehicle inner-side inner ring end surface of the tapered roller bearing. The track portion of at least one of the outer ring and the vehicle inner side inner ring in the tapered roller bearing has a predetermined shape in a state where the track portion is elastically deformed by the caulking. It is satisfy the condition designed to coercive, vehicle bearing assembly. 10. A hub wheel to which a wheel is attached and having a center hole, a double row outward tapered roller bearing mounted on the outer periphery of the hub wheel, and the tapered roller with respect to the center hole of the hub wheel. A constant velocity joint which is mounted so as to be integrally rotatable with the hub wheel in a state close to the bearing, wherein the tapered roller bearing has a single outer ring having two rows of rolling surfaces adjacent to each other in the axial direction. A vehicle having a plurality of tapered rollers arranged on the two rows of rolling surfaces, a single rolling surface paired with a rolling surface of the outer ring on the vehicle inner side, and an outer peripheral surface of the hub wheel; Including an inner ring fitted on the inner side,
And a required area of the outer peripheral surface of the hub wheel is used as a pair of rolling surfaces with the rolling surface of the outer ring on the vehicle outer side, and the vehicle inner shaft end of the hub wheel is radially outward. And is caulked against the inner ring end face of the tapered roller bearing, and the raceway portion shape of at least one of the inner ring and the outer ring in the tapered roller bearing has been elastically deformed by the caulking. A bearing device for a vehicle, which is designed to satisfy a condition for securing a predetermined shape in a state.