JP2001233008A - Hub unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure capable of applying a proper pre-load to a double row rolling bearing after combining a constant velocity joint with the double row rolling bearing with sufficient strength, in a hub unit. SOLUTION: In this hub unit, a flange part 35 in the outer ring 32 of a constant velocity joint 3 and the outside inner ring 21A of a double row rolling bearing 2 are stopped from rotating by a projecting and recessed engagement part, and as to a caulking load, it is controlled only in consideration of simply stopping the two inner rings 21A, 21B of the double row rolling bearing 2 from being pulled out and applying a proper pre-load to the double row rolling bearing 2. Thereby, motive power is efficiently and reliably transmitted to a wheel attached to the outside inner ring 21A of the double row rolling bearing 2, which is not shown in the figure, from a shaft 6 linked to the constant velocity joint 3, even without setting the caulking load more strongly than required as in the case of past examples.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hub unit incorporating a constant velocity joint.

[0002]

2. Description of the Related Art The present applicant has considered a hub unit incorporating a constant velocity joint as shown in FIG.

[0003] The hub unit 101 shown in the figure has a CVJ (Constant Vel) on the inner periphery of a double row rolling bearing 102.
constant joint 1 called “ocity Joint”
03 are incorporated, and their connection is in the following form.

That is, the outer race 10 of the constant velocity joint 103
The outer ring 102 of the double row rolling bearing 102 is provided with a radially outward flange 103b formed integrally with the axially outer end of the bearing 3a.
a by crimping the inner end of the outer race 103a of the constant velocity joint 103 in the axial direction so as to bend outward in the radial direction.
2 is pressed against the inner end face of the inner inner ring 102b.

Thus, the outer race 1 of the constant velocity joint 103
With the flange 103b of 03a and the caulked portion 104,
Two inner rings 102a and 102b of the double row rolling bearing 102
Are connected to each other by sandwiching them from the axial direction.

The outer ring 1 of the double row rolling bearing 102
02a radially outward flange 1 integrally formed
02c, the disc rotor 105 of the disc brake device and wheels (not shown) are attached to the outer surface of the double row rolling bearing 102.
A radially outward flange 102e integrally formed with d is bolted to the vehicle body 106.

[0007]

In the above conventional example, the double row rolling bearing 102 is mounted on the flange 1 of the constant velocity joint 103.
03b and the caulking portion 104, so that the two are connected.
Of the double row rolling bearing 102 from the shaft 107 which is spline-fitted to the inner ring 103c of the
The transmission of power to a wheel (not shown) attached to the vehicle is performed by frictional resistance between the two contact surfaces receiving a caulking load.

In such a structure in which the surfaces that are not caught in the circumferential direction are joined in such a manner that they come into contact with each other from the axial direction, consideration is given to applying an appropriate preload to the double row rolling bearing 102 with respect to the caulking load. If it is just done, the outer ring 103a of the constant velocity
And between the inner races 102a and 102b of the double row rolling bearing 102. On the other hand, when the caulking load is increased in consideration of creep prevention,
It is not preferable because the preload applied to the double row rolling bearing 102 becomes excessively large and shortens the life of the bearing. There is room for improvement here.

In view of such circumstances, the present invention provides a hub unit, in which a constant velocity joint and a double row rolling bearing are coupled with sufficient strength, and then an appropriate preload is applied to the double row rolling bearing. The purpose is to provide a structure that can be used.

[0010]

According to a first hub unit of the present invention, a constant-velocity joint is incorporated in the inner periphery of a double-row rolling bearing, and a shaft of one of two inner rings provided in the double-row rolling bearing is provided. The disc rotor and the wheel of the disc brake device are mounted on the outer surface of the radially outward flange integrally formed at the outer end in the direction, and are integrally formed at the axial outer end of the outer ring of the constant velocity joint. The axially inner end of the outer race of the constant velocity joint is bent radially outward while the outer end surface of the one inner race of the double row rolling bearing is in contact with the radially outwardly directed flange. The swaged portion is pressed against the inner end surface of the other inner race of the double row rolling bearing by being swaged in the form described above, and the flange at the outer race of the constant velocity joint is formed. Each abutment surface and one inner ring of Nji and double row rolling bearing, recesses and projections which engage in fitted with circumferentially from the axial direction is provided by distributing, and wherein a.

According to a second aspect of the present invention, in the above-mentioned first configuration, the concave portion and the convex portion provided on each contact surface between the flange on the outer ring of the constant velocity joint and the one inner ring of the double row rolling bearing, Each is characterized by a plurality of surface serrations provided at equal circumferential intervals.

In short, according to the present invention, the flange of the outer ring of the constant velocity joint and the outer inner ring of the double row rolling bearing are prevented from rotating by the concave / convex fitting portion. The two inner races are prevented from falling off and are managed in consideration of only applying an appropriate preload to the double row rolling bearing.

Thus, the power input to the constant velocity joint can be applied to the wheels (not shown) mounted on the outer inner ring of the double row rolling bearing without setting the caulking load more than necessary as in the conventional example. It becomes possible to transmit efficiently and reliably.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on embodiments shown in the drawings.

1 to 3 show an embodiment of the present invention. FIG. 1 is a longitudinal side view of the hub unit, and FIG.
FIG. 3 is a perspective view showing a coupling portion between an outer ring flange of a constant velocity joint and an outer inner ring of a double row rolling bearing in FIG. 1 separately, and FIG. 3 is a schematic diagram showing a use form of the hub unit of FIG.

The hub unit 1 shown in the figure has a structure in which a constant velocity joint 3 is incorporated in the inner periphery of a double row rolling bearing 2 such as a double row outward angular contact ball bearing.

The double row outward angular contact ball bearing 2 includes two inner rings 21A and 21B, a single outer ring 22 having two rows of raceways, a plurality of balls 23 arranged in two rows, and two And a retainer 24.

The constant velocity joint 3 is a generally known CV
J (Constant Velocity Join)
This is referred to as t) and includes an inner ring 31, an outer ring 32, a plurality of balls 33, and a retainer.

The outer race 21 of the double row rolling bearing 2
The disk rotor 4 and the wheels (not shown) of the disk brake device are mounted on the outer surface of the radially outward flange 25 integrally formed with the outer ring 22 of the double row rolling bearing 2. A radially outward flange 26 integrally formed with the vehicle body 5 is bolted to the vehicle body 5 or the like. Further, the constant velocity joint 3 is connected to a differential device 7 of the vehicle via a shaft 6 in a form as shown in FIG. The shaft 6 has its shaft end spline-fitted to the inner ring 31 of the constant velocity joint 3 and is fixed by the retaining ring 9 or the like.

Thus, the rotational power of the shaft 6 is transmitted via the outer ring 32 of the constant velocity joint 3 to wheels (not shown) attached to the outer inner ring 21A of the double row rolling bearing 2.

The constant velocity joint 3 normally forms a drive shaft assembly with a shaft 6 and a constant velocity joint 8 attached to the other end of the shaft 6. The hub unit 1 of this embodiment Then
Since the constant velocity joint 3 is incorporated, a product that is integrated with the drive shaft assembly can be obtained.

By the way, in the illustrated hub unit 1,
The tilting fulcrum of the constant velocity joint 3 is arranged at the axial center position of the double row rolling bearing 2, but such an arrangement has the following advantages. First, the bending moment does not need to act on the double row rolling bearing 2 when transmitting the torque of the constant velocity joint 3 or when a couple is generated. Further, a case where the constant velocity joint 3 is installed with a height difference H with respect to the differential device 7 as shown in FIG. 3 will be described. FIG. 3 shows a structure according to the present embodiment, and FIG. 4 shows a structure according to a comparative example. The comparative example has a conventional general structure in which the constant velocity joints 3 are provided adjacent to each other inside the hub unit 1. That is, in the present embodiment, the horizontal linear distance L1 from the tilting fulcrum of the constant velocity joint 3 to the connection portion between the shaft 6 and the differential device 7 is longer than L2 of the comparative example, and the inclination angle of the shaft 6, ie, the joint angle The angle θ1 is θ in the comparative example.
It becomes smaller than 2. Thereby, the double row rolling bearing 2
In contrast, the starting force due to the joint angle is reduced, and the life of the double row rolling bearing 2 can be improved. In addition, a boot attached to the constant velocity joint 3 (not shown)
There is also obtained an advantage that the amount of flexure is reduced and the life of damage is improved.

Next, the form of connection between the double row rolling bearing 2 and the constant velocity joint 3 will be described.

The double row rolling bearing 2 is fitted around the outer periphery of the constant velocity joint 3. The fitting form at this time may be clearance fitting or intermediate fitting.

A radially outward flange 35 is provided at the outer end of the outer race 32 of the constant velocity joint 3 in the axial direction, and the outer periphery of the outer race 21A of the double row rolling bearing 2 is provided with respect to the flange 35. Contact the end faces. In this state, the inner end in the axial direction of the outer race 32 of the constant velocity joint 3 is crimped in a form radially outwardly bent by a rolling crimping method or the like, so that the swaged portion 36 is formed on the inner race 21B of the double row rolling bearing 2. Press against the inner end face of. Thereby, the double row rolling bearing 2 is positioned in the axial direction with respect to the constant velocity joint 3, and the two are integrally connected.

Moreover, the flange 35 of the outer ring 32 of the constant velocity joint 3 and the outer inner ring 21A of the double row rolling bearing 2
A concave portion and a convex portion which are fitted in the axial direction and are integrated in the circumferential direction are separately provided on the respective contact surfaces.

Specifically, as shown in FIG. 2, for example, a male serration in which a plurality of convex teeth 37 are arranged at equal intervals in the circumferential direction is provided on the inner surface of the flange 35. A large-diameter hole 27 is provided at the outer end opening of one outer inner ring 21A, and a plurality of concave grooves 28 are arranged at regular intervals in the circumferential direction on a surface of the large-diameter hole 27 along the radial direction. Serrations are provided so that they can be fitted axially.

As described above, the outer race 32 of the constant velocity joint 3 is
35 and the outer inner ring 2 of the double row rolling bearing 2
1A is securely stopped by the male and female surface serrations. Regarding the caulking load, the two inner races 21A and 21B of the double row rolling bearing 2 are simply prevented from coming off and the double row rolling bearing 2 The management is performed in consideration of only giving an appropriate preload.

Thus, the outer inner ring 21 of the double row rolling bearing 2 can be connected to the shaft 6 connected to the constant velocity joint 3 without setting the caulking load more than necessary as in the conventional example.
A power can be efficiently and reliably transmitted to a wheel (not shown) attached to A.

It should be noted that the present invention is not limited to only the above embodiment, and various applications and modifications are conceivable.

For example, in the above embodiment, male and female surface serrations are used for the concave and convex portions provided on the contact surface between the outer race 32 of the constant velocity joint 3 and the outer race 21A of the double row rolling bearing 2. However, the present invention includes a configuration in which only one set of the concave portion and the convex portion is provided at at least one location on the circumference.

[0032]

According to the first and second aspects of the present invention, the flange of the outer ring of the constant velocity joint and the outer inner ring of the double row rolling bearing are prevented from rotating by an uneven fitting portion. Row rolling bearing 2
The two inner races are prevented from falling off and are managed in consideration of only applying an appropriate preload to the double row rolling bearing.

Thus, the power input to the constant velocity joint can be applied to the wheels (not shown) mounted on the outer inner ring of the double row rolling bearing without setting the caulking load more than necessary as in the conventional example. It becomes possible to transmit efficiently and reliably.

Therefore, according to the present invention, in the hub unit incorporating the constant velocity joint, the connection between the constant velocity joint and the double row rolling bearing can be strengthened, and an appropriate preload is applied to the double row rolling bearing. Will be able to provide reliable products.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a hub unit according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a contact surface between an outer ring flange of the constant velocity joint and an outer inner ring of the double row rolling bearing in FIG.

FIG. 3 is a schematic view showing a use mode of the hub unit of FIG. 1;

FIG. 4 is a schematic diagram showing a usage example of a comparative example with respect to the present embodiment.

FIG. 5 is a longitudinal sectional side view of a hub unit according to a conventional example.

[Explanation of symbols]

 Reference Signs List 1 hub unit 2 double row rolling bearing 3 constant velocity joint 4 disk rotor 21A outer inner ring of double row rolling bearing 2 21B inner inner ring of double row rolling bearing 2 25 flange of outer inner ring 21A 28 concave groove of flange 25 32 constant velocity joint 3 Outer ring 35 Flange of outer ring 32 36 Caulking portion of outer ring 32 37 Convex teeth of flange 35

Claims (2)

[Claims] A constant velocity joint is incorporated in the inner periphery of a double row rolling bearing, and a radially outwardly formed one is formed integrally with an axially outer end of one of two inner rings provided in the double row rolling bearing. A hub unit which is mounted in a state where a disk rotor and wheels of a disk brake device are applied to an outer surface of a flange, wherein a radially outward flange is integrally formed at an axially outer end of an outer ring of a constant velocity joint. When the outer end surface of the one inner ring of the double row rolling bearing is in contact with the inner race, the inner end in the axial direction of the outer ring of the constant velocity joint is swaged radially outward to be caulked. Part is pressed against the inner end face of the other inner ring of the double row rolling bearing, and one of the flange and the double row rolling bearing on the outer ring of the constant velocity joint is provided. Hub unit to the contact surface between the wheels, recesses and projections which engage in fitted with circumferentially from the axial direction is provided by distributing, characterized in that. 2. The hub unit according to claim 1, wherein the concave portion and the convex portion provided on each contact surface between the flange of the outer race of the constant velocity joint and one inner race of the double row rolling bearing have a circumference or the like, respectively. A hub unit having a plurality of surface serrations provided at intervals.