JP2002002211A - Hub unit for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To thermally isolate a double raw roller bearing and isokinetic joint to control the synergistically effective temperature rise on a hub unit of a vehicle having both bearing and constant velocity universal joint. SOLUTION: On a hub unit for vehicle provided with the double raw roller bearing 2 and constant-velocity universal joint 3 on a hub wheel 1 adjacently, insulating materials 8 are put between the joint face of the wheel 1 with the roller bearings 2 and joint 3. Therefor, the reciprocal thermal conduction is cut off between both sides and the sinergistically effective temperature rise is controlled. As a result, the thermal degradation of lubricant used on the roller bearing 2 and joint 3 at early stage is avoidable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hub unit for a vehicle to which a disk rotor and wheels of a disk brake device in a vehicle such as an automobile are attached.

[0002]

2. Description of the Related Art Generally, a hub unit for a vehicle is roughly classified into a type used on a driving wheel side of a vehicle such as an automobile and a type used on a driven wheel side.

[0003] Of these, the drive wheel type hub unit is provided with a double row rolling bearing 2 on the outer periphery of the hub wheel 1 and a hub unit 1 as shown in Fig. 1 presented in the embodiment of the present invention. The configuration is such that the constant velocity joints 3 are attached to the row rolling bearings 2 in proximity to each other.

The constant velocity joint 3 has an outer ring 31.
Is spline-fitted to the inner periphery of the hub wheel 1.

[0005] The outer periphery of the hub wheel 1
A radially outward flange 11 for mounting the disk rotor 4 and wheels of the disk brake device is provided.

[0006]

The conventional hub unit has a structure in which the double row rolling bearing 2 and the constant velocity joint 3 are attached to the hub wheel 1 in a state of being close to each other. The heat generated from the bearing 2 and the constant velocity joint 3 is mutually conducted through the hub wheel 1, whereby the temperature tends to increase synergistically. Therefore, the lubricant used for the double row rolling bearing 2 and the constant velocity joint 3 is thermally deteriorated earlier than expected, and the original lubricating action cannot be exhibited. As a result, the life of the double row rolling bearing 2 and the constant velocity joint 3 is likely to be shortened.

In view of such circumstances, an object of the present invention is to provide a vehicle hub unit having a double-row rolling bearing and a constant velocity joint, in which the two are thermally separated to suppress a synergistic temperature rise. And

[0008]

According to a first aspect of the present invention, there is provided a hub unit for a vehicle, wherein a double row rolling bearing is provided on an outer periphery of a hub wheel.
Further, constant velocity joints are respectively attached to the hub wheel in a state of being close to the double row rolling bearing, and a disc rotor of a disc brake device is provided on an outer surface of a radially outward flange formed integrally with the hub wheel. The wheel is attached in a state where it is applied, and a heat insulating material is interposed between the connecting surfaces of the hub wheel and the constant velocity joint.

According to a second aspect of the present invention, in the vehicle hub unit according to the first aspect, the constant velocity joint includes an outer ring,
An inner ring housed and arranged on the inner periphery thereof and connected to the input shaft,
Rolling elements interposed between them, and this outer ring
An inner peripheral surface has a bowl-shaped portion for accommodating the rolling elements and the inner ring, and a shaft connected to a small-diameter portion of the bowl-shaped portion. The shaft is spline-fitted to the inner periphery of the hub wheel. Thus, the constant velocity joint is coupled to the hub wheel.

According to a third aspect of the present invention, there is provided the vehicle hub unit according to the first or second configuration, wherein the heat insulating material has an outer diameter shape fitted to an inner periphery of the hub wheel, and a shaft of the constant velocity joint. The sleeve is formed to have an inner diameter shape fitted to the outer periphery of the portion.

According to a fourth aspect of the present invention, in the first or second configuration, the heat insulating material is formed on at least one of the inner peripheral surface of the hub wheel and the shaft portion of the constant velocity joint. The film is characterized in that

In summary, according to the present invention, a heat insulating material is interposed between the connecting surfaces of the hub wheel on which the double row rolling bearing is mounted and the constant velocity joint, so that mutual heat conduction between the two can be achieved. I try to shut it off. As a result, a synergistic temperature rise between the two is suppressed.

[0013]

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 sectional view showing a vehicle hub unit.
FIG. 2 is a sectional view taken along line (2)-(2) of FIG.
FIG. 4 is a perspective view of a heat insulating sleeve.

The illustrated vehicle hub unit is of a type used on the driving wheel side of an automobile, and includes a hub wheel 1.
, A double row rolling bearing 2 and a constant velocity joint 3.

The hub wheel 1 has a hollow structure, and a radially outward flange 11 is formed at an axially intermediate portion of an outer peripheral surface thereof. (Not shown), and a single row of balls 22 in the double row rolling bearing 2 is provided near the inner end of the outer peripheral surface.
The configuration is such that a group raceway surface 12 is formed.

The double row rolling bearing 2 is composed of a single outer ring 21 having two rows of raceways, a plurality of balls 22 as rolling elements arranged in two rows, and two crowned cages 23. As for the two inner rings that are originally required, one uses the raceway surface of the hub wheel 1 as described above, and only the other inner ring 25 is provided. The outer ring 21 is formed with a radially outward flange 24 which is bolted to the vehicle body 6 or the like.

The constant velocity joint 3 is called a well-known Zeppa type (Barfield type) constant velocity joint, and includes an outer ring 31, an inner ring 32, a ball 33, and a retainer.
It is composed of Outer ring 31 is inner ring 32, ball 3
Bowl-shaped portion 35 in which the container 3 and the retainer 34 are stored and arranged
And a shaft portion 3 integrally connected to the small diameter side of the bowl-shaped portion 35.
6 is comprised. On the outer peripheral surface of the shaft portion 36,
A male spline (symbol is omitted) is spline-fitted to a female spline (symbol is omitted) of the hub wheel 1. Further, one end of the shaft 7 is spline-fitted to the inner ring 32 and is fixed to the inner ring 32 by a retaining ring (reference numeral omitted). The other end of the shaft 7 is connected to the vehicle via another constant velocity joint (not shown). Attached to the differential device.

A double row rolling bearing 2 is mounted on the outer peripheral surface of the hub wheel 1 and a constant velocity joint 3 is mounted on the hub wheel 1 in a state of being close to the double row rolling bearing 2. In order to separate the constant velocity joint 3 from the hub wheel 1 as necessary, the shaft portion 36 of the outer ring 31 of the constant velocity joint 3 is spline-fitted to the inner periphery of the hub wheel 1, and Attached to the outer periphery of the shaft end side of the shaft portion 36 of the constant velocity joint 3
The retaining ring 37 is retained in such a manner as to be hooked in the axial direction with respect to the step of the minutely enlarged portion of the hub wheel 1.

Further, bolts 13 for fixing the disk rotor 4 of the disk brake device and the wheels (not shown) 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 the wheels (not shown) attached to the hub wheel 1 via the constant velocity joint 3.

The first embodiment is characterized in that a heat insulating sleeve 8 is interposed between the connecting surfaces of the hub wheel 1 on which the double row rolling bearing 2 is mounted and the constant velocity joint 3.

The material of the heat insulating sleeve 8 is, for example, resin, rubber, ceramic or the like.

As shown in FIGS. 2 and 3, the heat-insulating sleeve 8 has a shape in which a flange 82 extending radially outward is formed at one axial end of a cylindrical portion 81. The portion 81 is formed in a wavy shape having a plurality of irregularities in the circumferential direction so as to fit into the female spline of the hub wheel 1 and the male spline of the shaft portion 36 of the constant velocity joint 3 respectively.

Then, the cylindrical portion 81 of the heat insulating sleeve 8
However, between the female spline of the hub wheel 1 and the male spline of the constant velocity joint 3, the flange 82 of the heat insulating sleeve 8 is provided between the inner end face of the hub wheel 1 and the outer ring 31 of the constant velocity joint 3. The heat-insulating sleeve 8 thermally separates the hub wheel 1 on which the double-row rolling bearing 2 is mounted and the constant velocity joint 3 from each other. The cylindrical portion 81 of the heat insulating sleeve 8 has a shaft portion of the outer ring 31 of the constant velocity joint 3 so as not to interfere with the C-shaped retaining ring 37 mounted on the shaft portion 36 of the constant velocity joint 3. Although it is set shorter than 36, since it is a position far from the heat generation part of the constant velocity joint 3,
No problem on insulation.

With such a configuration, the hub wheel 1
The heat generated from the double row rolling bearings 2 and the constant velocity joints 3 due to the rotation of the rotor is cut off without being conducted to each other by the heat insulating sleeve 8, so that their temperatures are suppressed from rising synergistically. can do. This allows
The heat generated from the double row rolling bearing 2 and the constant velocity joint 3 is radiated to the outside independently of each other.
Therefore, the lubricant such as grease used for the double row rolling bearing 2 and the constant velocity joint 3 does not deteriorate faster than expected as in the conventional example, and a good lubricating action can be exhibited for a long time. As a result, the double row rolling bearing 2 and the constant velocity joint 3 can achieve the designed life.

Further, if the heat insulating sleeve 8 is made of a material such as a soft resin or rubber, for example, the heat insulating sleeve 8 plays a role of a shock absorber against vibration and the like, and can be alleviated.

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

(1) In the above embodiment, the heat insulating sleeve 8 is used as the heat insulating material. However, the cylindrical shaft portion 36 of the female spline formed on the inner periphery of the hub wheel 1 or the outer ring 31 of the constant velocity joint 3 is used. A heat insulating material may be applied to at least one of the male splines formed as described above. In this case, for example, a method of dipping a heat-resistant synthetic resin or a heat-resistant rubber melted as a heat insulating material, or various coating methods may be used. In this case, in addition to obtaining the same heat insulating effect as in the above embodiment, the assemblability when the hub wheel 1 and the shaft portion 36 of the constant velocity joint 3 are spline-fitted is simplified.

(2) In the above embodiment, an example is shown in which the hub wheel 1 and the shaft portion 36 of the constant velocity joint 3 are spline-fitted.
And a structure in which the two are fitted together and a nut is screwed into the shaft end of the shaft portion 36 and tightened to the end surface of the hub wheel. The present invention can be applied.

[0031]

According to the first to fourth aspects of the present invention, a heat insulating material is interposed between the connecting surfaces of the hub wheel on which the double row rolling bearing is mounted and the constant velocity joint, so that the mutual heat between the two can be attained. , So that a synergistic increase in temperature can be suppressed. As a result, the lubricant used in double-row rolling bearings and constant velocity joints does not deteriorate at an early stage, and good lubrication can be expected over a long period of time. As a result, the reliability of the vehicle hub unit can be improved.

In particular, according to the second aspect of the present invention, by connecting the shaft portion of the constant velocity joint to the inner periphery of the hub wheel by spline fitting, the contact area between them increases, so that the amount of heat per unit area And a large-area heat-insulating material having projections and depressions can block the both, which is advantageous in enhancing the heat-insulating action.

According to the fourth aspect of the present invention, the play between the connecting surfaces of the hub wheel and the constant velocity joint can be absorbed by the film-like heat insulating material. Is advantageous. Further, the play in the axial direction of the spline portion can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is a perspective view of a heat insulating sleeve shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hub wheel 2 Double row rolling bearing 3 Constant velocity joint 4 Disk rotor 8 Heat insulation sleeve 31 Outer ring of constant velocity joint 36 Shaft of constant velocity joint

Claims (4)

[Claims] A double row rolling bearing is provided on the outer periphery of a hub wheel.
Further, constant velocity joints are respectively attached to the hub wheel in a state of being close to the double row rolling bearing, and a disc rotor of a disc brake device is provided on an outer surface of a radially outward flange formed integrally with the hub wheel. A vehicle hub unit mounted with wheels applied thereto, wherein a heat insulating material is interposed between coupling surfaces between the hub wheel and a constant velocity joint. . 2. The vehicle hub unit according to claim 1, wherein the constant velocity joint is interposed between an outer ring, an inner ring housed and arranged on an inner periphery thereof, and an input shaft connected thereto. The outer ring has a bowl-shaped portion on the inner peripheral surface for accommodating the rolling element and the inner ring, and a shaft connected to a small-diameter portion of the bowl-shaped portion. A hub unit for a vehicle, wherein a constant velocity joint is coupled to a hub wheel by being spline-fitted to an inner periphery of the hub wheel. 3. The vehicle hub unit according to claim 1, wherein the heat insulating material has an outer diameter shape fitted to an inner periphery of the hub wheel and an outer periphery of a shaft portion of the constant velocity joint. A hub unit for a vehicle, which is a sleeve formed to have an inner diameter shape that matches. 4. The vehicle hub unit according to claim 1, wherein the heat insulating material is a film formed on at least one of an inner peripheral surface of the hub wheel and a shaft portion of the constant velocity joint. A hub unit for a vehicle.