JP3954264B2 - Hub unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive a long life of a double row rolling bearing by enhancing its heat radiation performance, in a hub unit. SOLUTION: In this hub unit A, a constant velocity joint 3 is assembled onto the inner periphery of a double row rolling bearing 2, and the disc rotor 4 of a disc brake device and a wheel (not shown in the figure) are mounted in their applied state to the outer surface of a flange 25 facing outward in its diameter direction, which is integrally formed at the axially outer end of the one inner ring 21A out of two inner rings 21A, 21B equipped in the double row rolling bearing 2. The surface area is increased by forming projecting and recessed parts 40, 41 on the inner end surface of the other inner ring 21B of the double row rolling bearing 2. Thereby, heat radiation performance of the double row rolling bearing 2 is enhanced.

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, since the constant velocity joint 103 is disposed on the inner periphery of the double row rolling bearing 102, not only the internal heat generation of the double row rolling bearing 102 but also the internal heat generation of the constant velocity joint 103 is added. It can be said that the temperature rises easily. In such a situation where the temperature rise increases, the lubricant in the double row rolling bearing 102 is likely to be deteriorated and the life of the bearing is shortened. There is room for improvement here.
[0008]
In view of such circumstances, an object of the present invention is to improve the heat dissipation of the hub unit and improve the life of the double row rolling bearing.
[0009]
[Means for Solving the Problems]
The present invention first hub unit, the outer ring of the constant velocity joint is incorporated in the inner periphery of the double row rolling bearing, irregularities are formed on the inner end face of the inner inner race of the two inner rings provided before Kifuku row rolling bearing The outer end face of the outer inner ring of the double row rolling bearing is brought into contact with a radially outward flange formed integrally with the axial outer end of the outer ring of the constant velocity joint, and the double row rolling bearing The inner and outer inner rings of the double row rolling bearing are fixed to the outer periphery of the outer ring of the constant velocity joint by the caulking portion formed at the inner end of the inner ring in the axial direction of the outer ring of the constant velocity joint. It is characterized by that.
[0010]
The second hub unit of the present invention is characterized in that, in the first configuration, the tilting fulcrum of the constant velocity joint is disposed at a substantially central position in the axial direction between the two rows of raceways of the double row rolling bearing. It is said.
[0011]
The third hub unit of the present invention is characterized in that, in the first or second configuration, the unevenness formed at the inner end of the inner ring of the double row rolling bearing is provided at a plurality of locations around the circumference. It is said.
[0012]
In the fourth hub unit of the present invention, in the first or second configuration described above, the unevenness formed at the inner end of the inner ring of the double row rolling bearing is provided at equal intervals in a plurality of locations around the circumference. The convex portion is inclined at a required angle with respect to the radial direction.
[0013]
In short, in the present invention, since the surface area is increased by providing irregularities on the inner end face of the inner inner ring of the double row rolling bearing, the heat dissipation of the double row rolling bearing and constant velocity joint is enhanced.
[0014]
In particular, in the present invention , the caulking portion at the inner end in the axial direction of the outer ring of the constant velocity joint is bitten by the irregularities on the inner end surface of the inner inner ring of the double row rolling bearing, so that the caulking strength is increased.
[0015]
Further, in the third configuration, since the unevenness is increased, it is advantageous in increasing the surface area, and when the inner inner ring rotates, the unevenness entrains the surrounding air and causes a wind. The heat dissipation of the rolling bearing and the constant velocity joint is further enhanced.
[0016]
Further, in the fourth configuration, since the irregularities are inclined, it is possible to efficiently blow the wind generated by the irregularities with the rotation to the double row rolling bearing and the constant velocity joint.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings.
[0018]
1 to 3 show an embodiment of the present invention. FIG. 1 is a longitudinal side view of the hub unit, FIG. 2 is a perspective view showing an inner inner ring of the double row rolling bearing in FIG. 1, and FIG. 3 is a schematic view showing a usage form of the hub unit in FIG.
[0019]
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.
[0020]
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.
[0021]
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.
[0022]
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.
[0023]
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.
[0024]
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.
[0025]
Next, the coupling | bonding form of the double row rolling bearing 2 and the constant velocity joint 3 is demonstrated.
[0026]
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.
[0027]
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.
[0028]
By the way, in the hub unit A incorporating the constant velocity joint 3 as described above, the double row rolling bearing 2 is likely to rise in temperature due to heat generated by the operation thereof, so that the temperature rise is devised. There is a special feature.
[0029]
Specifically, recesses 40 are formed along the radial direction at equal intervals in the circumferential direction on the inner end face of the inner inner ring 21B of the double row rolling bearing 2. Since the inner end surface of the inner inner ring 21B is on the counter-counter bore side, it is possible to suppress a decrease in strength due to the provision of the recess 40, and even if the axial dimension is set large in advance in consideration of the decrease in strength. Good. Further, the recess 40 can be formed by forging or turning, for example.
[0030]
By forming such a plurality of recesses 40, the protrusions 41 exist between the recesses 40 that are adjacent in the circumferential direction, and unevenness is formed.
[0031]
Due to the presence of such irregularities 40 and 41, the surface area of the inner inner ring 21B increases, so that heat generated inside the double row rolling bearing 2 is efficiently dissipated from the surface of the inner inner ring 21B. As a result, temperature rise can be suppressed. Further, the heat generated inside the constant velocity joint 3 is also conducted to the inner inner ring 21B, and thus is similarly dissipated. Further, when the inner inner ring 21B rotates, the irregularities 40 and 41 entrain the surrounding air and generate wind, so that the heat radiation action of the double row rolling bearing 2 and the constant velocity joint 3 is promoted. Accordingly, the overall temperature rise of the double row rolling bearing 2 and the constant velocity joint 3 can be suppressed, and the lubricant deterioration of the double row rolling bearing 2 and the constant velocity joint 3 can be suppressed. Contributes to improved durability.
[0032]
Moreover, since the caulking portion 36 at the inner end in the axial direction of the outer ring 32 of the constant velocity joint 3 is bitten into the irregularities 40 and 41 on the inner end face of the inner inner ring 21B of the double row rolling bearing 2, the caulking strength is increased. As a result, the constant velocity joint 3 and the double-row rolling bearing 2 are firmly coupled in the circumferential direction. As a result, power can be efficiently and reliably transmitted from the shaft 6 connected to the constant velocity joint 3 to the wheel (not shown) attached to the outer inner ring 21A of the double row rolling bearing 2.
[0033]
In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.
[0034]
For example, the number of recesses 40 and protrusions 41 provided in the inner inner ring 21B of the double-row rolling bearing 2 shown in the above embodiment may be increased or decreased as appropriate, and as shown in FIG. 4 and FIG. , 41 are inclined by the required angle θ with respect to the radial direction, and are also included in the present invention. In this case, regarding the inclination direction of the concaves and convexes 40 and 41, if the forward blade shape is formed in consideration of the rotation direction of the inner inner ring 21B, the wind generated by the rotation is applied to the double row rolling bearing 2 and the constant velocity joint 3. Therefore, it is advantageous to further promote the heat radiation action of the double row rolling bearing 2 and the constant velocity joint 3.
[0035]
【The invention's effect】
In the inventions of claims 1 to 4, since the heat inside the double row rolling bearing and the heat inside the constant velocity joint are devised efficiently, the overall temperature rise of the double row rolling bearing and the constant velocity joint is devised. Can be suppressed. Thereby, since it becomes possible to suppress the lubricant deterioration of the double row rolling bearing and the constant velocity joint, it is possible to contribute to improving the durability of them.
[0036]
In particular, in the present invention , the caulking portion of the inner end in the axial direction of the outer ring of the constant velocity joint is bitten by the unevenness on the inner end surface of the inner inner ring of the double row rolling bearing, so that the caulking strength is increased. Thus, the outer ring of the constant velocity joint and the inner ring of the double row rolling bearing are firmly coupled in the circumferential direction.
[0037]
In addition, in the configuration of the third aspect, since the unevenness is increased, it is advantageous for increasing the surface area, and when the inner inner ring rotates, the unevenness entrains the surrounding air and causes a wind. It becomes possible to promote the heat radiation effect of the row rolling bearing and the constant velocity joint.
[0038]
Moreover, in the structure of the said Claim 4, since it is set as the form which has an inclination about an unevenness | corrugation, the wind which an unevenness | corrugation generate | occur | produces with rotation can be efficiently sprayed with respect to a double row rolling bearing or a constant velocity joint. This is advantageous in further promoting the heat radiation action of the double row rolling bearing and the constant velocity joint.
[0039]
Therefore, in the present invention, the hub unit incorporating the constant velocity joint can contribute to improving the durability of the double row rolling bearing and the constant velocity joint by suppressing the overall temperature rise thereof, and the like. It will be possible to provide a reliable product with a fast joint.
[Brief description of the drawings]
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 an inner inner ring of a double row rolling bearing in FIG. 1. FIG. 3 shows a usage form of the hub unit of FIG. Schematic diagram [Fig. 4] A modified example of irregularities provided on the inner inner ring of a double row rolling bearing, corresponding to Fig. 2. [Fig. 5] Front view showing the inner end face of the inner inner ring in Fig. 4. [Fig. Longitudinal side view of such a hub unit [Explanation of symbols]
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 32 of outer inner ring 21A Outer ring 35 of constant velocity joint 3 Flange 36 Caulking portion 40 of outer ring 32 Depression 41 Convex portion

Claims (4)

The outer ring of the constant velocity joint is incorporated in the inner periphery of the double row rolling bearing is uneven on the inner end face of the inner inner race of the two inner rings provided before Kifuku row rolling bearing is formed outside the inner ring of the double row rolling bearing The outer end surface of the inner ring of the constant velocity joint is brought into contact with the radially outward flange formed integrally with the outer end in the axial direction of the outer ring, and the unevenness of the inner end surface of the inner inner ring of the double row rolling bearing is A hub characterized in that the inner and outer inner rings of the double row rolling bearing are fixed to the outer periphery of the outer ring of the constant velocity joint by biting a caulking portion formed at the inner end in the axial direction of the outer ring of the constant velocity joint. unit. The hub unit according to claim 1,
The tilting fulcrum of the constant velocity joint is disposed at substantially the center position in the axial direction between the two rows of raceways of the double row rolling bearing,
Hub unit characterized by that. The hub unit according to claim 1 or 2,
A hub unit, wherein unevenness formed on an inner end of an inner inner ring of the double-row rolling bearing is provided at a plurality of locations around the circumference. The hub unit according to claim 1 or 2,
Concavities and convexities formed at the inner end of the inner ring of the double row rolling bearing are provided at equal intervals around the circumference, and the convex portions are inclined at a required angle with respect to the radial direction. Features hub unit.

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