JP3905281B2 - Hub unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hub unit incorporating a constant velocity joint.
[0002]
[Prior art]
The applicant of the present application considers a hub unit incorporating a constant velocity joint as shown in FIG.
[0003]
The hub unit 101 shown in the figure has a structure in which a constant velocity joint 103 called CVJ (Constant Velocity Joint) is incorporated in the inner periphery of the double row rolling bearing 102, and the coupling thereof is configured as follows. Yes.
[0004]
That is, a radially outward flange 103b integrally formed at the axial outer end of the outer ring 103a of the constant velocity joint 103 is brought into contact with the outer inner ring 102a of the double row rolling bearing 102 so that the constant velocity joint 103 The caulking portion 104 is pressed against the inner end surface of the inner inner ring 102b of the bearing 102 by caulking the inner end in the axial direction of the outer ring 103a so as to bend and deform radially outward.
[0005]
Thus, the flange 103b of the outer ring 103a of the constant velocity joint 103 and the caulking portion 104 couple the two inner rings 102a and 102b of the double row rolling bearing 102 so as to be sandwiched from the axial direction.
[0006]
The disc rotor 105 of the disc brake device and a wheel (not shown) are attached to the outer surface of the radially outward flange 102c formed integrally with the outer inner ring 102a of the double row rolling bearing 102. Further, a radially outward flange 102e formed integrally with the outer ring 102d of the double row rolling bearing 102 is bolted to the vehicle body 106.
[0007]
[Problems to be solved by the invention]
In the above conventional example, the double row rolling bearing 102 is sandwiched between the flange 103b of the constant velocity joint 103 and the caulking portion 104 so as to be coupled to each other, and the spline fitting is performed on the inner ring 103c of the constant velocity joint 103. The power transmission from the combined shaft 107 to the wheel (not shown) attached to the outer inner ring 102a of the double row rolling bearing 102 is performed by the frictional resistance between the two contact surfaces receiving the caulking load. It is like that.
[0008]
In such a structure in which the surfaces that are not caught in the circumferential direction are joined in a form in which they are brought into contact with each other in the axial direction, only an appropriate preload is applied to the double row rolling bearing 102 with respect to the caulking load. If so, there is a risk that creep will occur between the outer ring 103 a of the constant velocity joint 103 and the inner rings 102 a and 102 b of the double row rolling bearing 102 due to insufficient coupling strength. On the other hand, if the caulking load is increased in consideration of the prevention of creep, the preload applied to the double row rolling bearing 102 becomes unnecessarily large and the bearing life is reduced. There is room for improvement here.
[0009]
In view of such circumstances, the present invention has a structure in which an appropriate preload can be applied to the double row rolling bearing after the constant velocity joint and the double row rolling bearing are coupled with sufficient strength in the hub unit. For the purpose of provision.
[0010]
[Means for Solving the Problems]
In the first hub unit of the present invention, a constant velocity joint is incorporated in the inner periphery of the double row rolling bearing, and the diameter is integrally formed at the outer end in the axial direction of one inner ring of two inner rings provided in the double row rolling bearing. It is attached with the disc rotor and wheels of the disc brake device applied to the outer surface of the outwardly facing flange, and is a radially outward flange that is formed integrally with the axially outer end of the outer ring of the constant velocity joint. On the other hand, when the outer end surface of the one inner ring of the double row rolling bearing is in contact with the outer ring, the axial inner end of the outer ring of the constant velocity joint is caulked in a form that is bent and deformed radially outward. The caulking portion 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 in the outer ring of the constant velocity joint Each contact surface between the wheels, recesses and projections which engage in fitted with circumferentially from the axial direction is provided by distributing, and wherein a.
[0011]
In the second hub unit of the present invention, in the first configuration described above, the concave portion and the convex portion provided on each contact surface between the flange of the outer ring of the constant velocity joint and one inner ring of the double-row rolling bearing are respectively circular. It is characterized by a plurality of surface serrations provided at equal circumferential intervals.
[0012]
In short, in the present invention, the flange in 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. In addition to preventing it from falling off, it is managed in consideration of only giving an appropriate preload to the double row rolling bearing.
[0013]
As a result, the power input to the constant velocity joint can be efficiently and reliably applied to the wheels (not shown) attached to the outer ring of the double row rolling bearing without setting the caulking load stronger than necessary as in the conventional example. Can be transmitted to.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings.
[0015]
1 to 3 show an embodiment of the present invention. FIG. 1 is a longitudinal side view of a hub unit, FIG. 2 is a perspective view showing a joint 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, and FIG. It is a schematic diagram which shows the usage condition of this hub unit.
[0016]
The hub unit 1 shown in the figure has a configuration in which a constant velocity joint 3 is incorporated on the inner periphery of a double row rolling bearing 2 such as a double row outward angular ball bearing.
[0017]
The double-row outward angular ball bearing 2 includes two inner rings 21A and 21B, a single outer ring 22 having two rows of raceway grooves, a plurality of balls 23 arranged in two rows, and two cages 24. And.
[0018]
The constant velocity joint 3 is generally called CVJ (Constant Velocity Joint), and includes an inner ring 31, an outer ring 32, a plurality of balls 33, and a cage 34.
[0019]
Then, the disc rotor 4 and the wheel (not shown) of the disc brake device are attached to the outer surface of the radially outward flange 25 formed integrally with the outer inner ring 21A of the double row rolling bearing 2. Then, a radially outward flange 26 formed integrally with the outer ring 22 of the double-row rolling bearing 2 is bolted to the vehicle body 5 and the like. Moreover, the constant velocity joint 3 is connected with respect to the differential apparatus 7 of a vehicle through the shaft 6 in the form as shown in FIG. The shaft 6 has a shaft end that is spline-fitted to the inner ring 31 of the constant velocity joint 3 and is fixed by a retaining ring 9 or the like.
[0020]
Thereby, the rotational power of the shaft 6 is transmitted to the wheel (not shown) attached to the outer inner ring 21A of the double row rolling bearing 2 via the outer ring 32 of the constant velocity joint 3.
[0021]
The constant velocity joint 3 normally constitutes a drive shaft assembly with the shaft 6 and the constant velocity joint 8 attached to the other end of the shaft 6. In the hub unit 1 of this embodiment, Since the constant velocity joint 3 is incorporated, a product combined with the drive shaft assembly can be obtained.
[0022]
By the way, in the hub unit 1 of the illustrated example, the tilting fulcrum of the constant velocity joint 3 is arranged at the center position in the axial direction of the double-row rolling bearing 2. is there. First, a bending moment does not act on the double row rolling bearing 2 when torque is transmitted to the constant velocity joint 3 or when a couple is generated. Moreover, as shown in FIG. 3, the case where the constant velocity joint 3 is installed in the state which attached the height difference H with respect to the differential apparatus 7 is demonstrated. FIG. 3 shows a structure according to this 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 joint 3 is provided adjacent to each other inside the hub unit 1. That is, in this embodiment, the horizontal linear distance L1 from the tilting fulcrum of the constant velocity joint 3 to the connecting portion of the shaft 6 and the differential device 7 is longer than L2 of the comparative example, and the inclination angle of the shaft 6, that is, the joint The angle θ1 is smaller than θ2 of the comparative example. As a result, the starting force caused by the joint angle with respect to the double row rolling bearing 2 is reduced, and the life of the double row rolling bearing 2 can be improved. In addition, the amount of bending of the boot (not shown) attached to the constant velocity joint 3 is reduced, and the merit that the breakage life is improved is also obtained.
[0023]
Next, the coupling | bonding form of the double row rolling bearing 2 and the constant velocity joint 3 is demonstrated.
[0024]
A double-row rolling bearing 2 is fitted on the outer periphery of the constant velocity joint 3. The fitting form at this time may be a clearance fit or an intermediate fit.
[0025]
A radially outward flange 35 is provided at the outer end 32 in the axial direction of the outer ring 32 of the constant velocity joint 3, and the outer end surface of the outer inner ring 21 </ b> A of the double row rolling bearing 2 is abutted against the flange 35. Make contact. In this state, the caulking portion 36 is caulked in a form in which the axial inner end of the outer ring 32 of the constant velocity joint 3 is bent and deformed radially outward by a rolling caulking method or the like. Press against the inner edge of the. Thereby, the double row rolling bearing 2 is positioned with respect to the constant velocity joint 3 in the axial direction, and the both are integrally coupled.
[0026]
In addition, a concave portion and a convex portion that are fitted from the axial direction and integrated in the circumferential direction are distributed to each contact surface between the flange 35 in the outer ring 32 of the constant velocity joint 3 and the outer inner ring 21A of the double row rolling bearing 2. Is provided.
[0027]
Specifically, as shown in FIG. 2, for example, the inner surface of the flange 35 is provided with a male serration in which a plurality of convex teeth 37 are arranged at equal intervals in the circumferential direction. A large-diameter hole 27 is provided in the outer end side opening of one outer inner ring 21A, and a plurality of concave grooves 28 are arranged on the surface along the radial direction in the large-diameter hole 27 at equal intervals in the circumferential direction. Serrations are provided so that they can be fitted from the axial direction.
[0028]
In this manner, the flange 35 in the outer ring 32 of the constant velocity joint 3 and the outer inner ring 21A of the double row rolling bearing 2 are reliably prevented from rotating by male and female surface serrations, and the caulking load is simply double row rolling. The two inner rings 21 </ b> A and 21 </ b> B of the bearing 2 are prevented from coming off and managed in consideration of only applying an appropriate preload to the double-row rolling bearing 2.
[0029]
Thereby, with respect to a wheel (not shown) attached to the outer inner ring 21A of the double row rolling bearing 2 from the shaft 6 connected to the constant velocity joint 3 without setting the caulking load stronger than necessary as in the conventional example. Power can be transmitted efficiently and reliably.
[0030]
In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.
[0031]
For example, in the above embodiment, an example is given in which male and female surface serrations are provided for the concave portions and convex portions provided on the contact surface between the outer ring 32 of the constant velocity joint 3 and the outer inner ring 21A of the double row rolling bearing 2. A configuration in which only one set of concave and convex portions is provided at least at one location on the circumference is also included in the present invention.
[0032]
【The invention's effect】
According to the first and second aspects of the present invention, the flange in 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, and the caulking load is simply 2 of the double row rolling bearing. The inner ring is prevented from coming off and is managed in consideration of only giving an appropriate preload to the double row rolling bearing.
[0033]
As a result, the power input to the constant velocity joint can be efficiently and reliably applied to the wheels (not shown) attached to the outer ring of the double row rolling bearing without setting the caulking load stronger than necessary as in the conventional example. Can be transmitted to.
[0034]
Therefore, in the present invention, for a hub unit incorporating a constant velocity joint, the coupling between the constant velocity joint and the double row rolling bearing can be strengthened, and an appropriate preload can be applied to the double row rolling bearing. It becomes possible to provide highly reliable products.
[Brief description of the drawings]
FIG. 1 is a longitudinal 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 a constant velocity joint and an outer inner ring of a double row rolling bearing in FIG. 3 is a schematic diagram showing a usage pattern of the hub unit of FIG. 1. FIG. 4 is a schematic diagram showing a usage pattern of a comparative example with respect to the present embodiment. FIG. 5 is a vertical side view of a hub unit according to a conventional example. Explanation】
DESCRIPTION OF SYMBOLS 1 Hub unit 2 Double row rolling bearing 3 Constant velocity joint 4 Disc rotor 21A Outer inner ring 21B of double row rolling bearing 2 Inner inner ring 25 of double row rolling bearing 2 Flange 28 of outer inner ring 21A Concave groove 32 of flange 25 Constant velocity joint 3 Outer ring 35 Flange 36 of outer ring 32 Caulking portion 37 of outer ring 32 Convex teeth of flange 35

Claims (2)

A constant velocity joint is incorporated in the inner periphery of the double row rolling bearing, and a disk is formed on the outer surface of the radially outward flange formed integrally with the axial outer end of one of the two inner rings provided in the double row rolling bearing. A hub unit mounted with the disc rotor and wheels of the brake device applied thereto,
The outer ring of the constant velocity joint in a state where the outer end surface of the one inner ring of the double row rolling bearing is in contact with a radially outward flange formed integrally with the outer end of the constant velocity joint in the axial outer end. The caulking portion is pressed against the inner end surface of the other inner ring of the double row rolling bearing by caulking the inner end in the axial direction in a form that is bent and deformed radially outward.
A concave portion and a convex portion that are fitted from the axial direction and engaged in the circumferential direction are provided separately on the contact surfaces of the flange in the outer ring of the constant velocity joint and one inner ring of the double row rolling bearing. Hub unit characterized by. The hub unit according to claim 1, wherein
The concave and convex portions provided on the contact surfaces of the flange in the outer ring of the constant velocity joint and the one inner ring of the double row rolling bearing are each a surface serration provided in a plurality at equal circumferential intervals. Features hub unit.

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