JP2003104004A - Bearing unit for driving wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make separable an inner member and an outer joint member along an axial direction by simple structure, and to allow highly reliable driving at low cost. SOLUTION: The inner member 1 comprises a hub ring 2 and an inner ring 3, a small-diametric stepped part 8 of the inner ring 3 is internally fitted to the hub ring 2, an engaging part 8b of the stepped part 8 is engaged with an uneven part 7 formed in the hub ring 2, a diameter of the engaging part 8b is enlarged to be bit in the uneven part 7 and to be coupled plastically, and a set screw 25 engaged with a male spline 9a formed in a connection part 9 of the inner ring 3 and a recessed part 9b formed in a female spline 3a formed in a shoulder part of the outer joint member 21 is attached to the shoulder part 23 detachably diametric-directionally so as to make the inner member and the outer joint member separable along the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive wheel bearing device for supporting a drive wheel of an automobile or the like, and particularly to a drive in which an inner member, a double row rolling bearing and a constant velocity universal joint are unitized. The present invention relates to a bearing device for a wheel.

[0002]

2. Description of the Related Art Driving wheels of an automobile such as a rear wheel of an FR vehicle, a front wheel of an FF vehicle, or all wheels of a 4WD vehicle are supported by a suspension device by a bearing device for driving wheels. In recent years, bearing devices for drive wheels have tended to be unitized with an inner member including a hub wheel, a double-row rolling bearing, and a constant velocity universal joint aiming at weight reduction and compactness.

Conventionally, as this type of structure, Japanese Patent Laid-Open No. 10-
There are those described in Japanese Patent No. 264605 and Japanese Patent Laid-Open No. 2001-18605. FIG. 5 shows a drive wheel bearing device described in these publications. The drive wheel bearing device is configured by uniting an inner member 50, a rolling bearing 60, and a constant velocity universal joint 70. The inner member 50 includes a hub wheel 51, an inner ring 52 fitted to the hub wheel 51, and an annular member 53. Hub wheel 51
Has a wheel mounting flange 54 for mounting a wheel (not shown) integrally, and presses the inner ring 52 and the annular member 53 into the small diameter step portion 55, respectively. A male spline 53a and a female spline 53 are provided on the outer circumference and the inner circumference of the annular member 53, respectively.
b is formed, and a male spline 55a that engages with the female spline 53b is formed at the end of the small diameter step 55. The inner ring 52 is sandwiched and fixed by the hub wheel 51 and the annular member 53, and the end portion of the small diameter step portion 55 is plastically deformed outward in the radial direction to form a caulking portion 56, and the annular member 53 is rotated with respect to the hub wheel 51. Inseparably and inseparably connected in the axial direction.

The double-row rolling bearing 60 includes an outer member 61 and double-row rolling elements 62, 62, and the outer member 61 has a vehicle body mounting flange 63 for mounting on a vehicle body (not shown) on the outer periphery thereof. It has one and has double rows of outer raceways 61 on the inner circumference.
a and 61a are formed. These double row outer rolling surfaces 6
Double rows of inner raceways 51a, 52 facing 1a, 61a
a is formed on the outer circumferences of the hub ring 51 and the inner ring 52, respectively. The double-row rolling elements 62, 62 are connected to the rolling surfaces 61a, 5
It is housed between 1a and 61a, 52a, respectively. Seals 64 and 65 are attached to the ends of the outer member 61 to prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater, dust, etc. from the outside.

The constant velocity universal joint 70 comprises an outer joint member 71, a joint inner ring (not shown), a cage, and a torque transmission ball. The outer joint member 71 includes a cup-shaped mouth portion 72 and a shoulder portion 7 formed to have a smaller diameter than the mouth portion 72.
3, and a curved track groove 72a extending in the axial direction is formed on the inner circumference of the mouth portion 72. The outer joint member 71 has a hollow shape, and a female spline 73a is formed on the inner circumference of the shoulder portion 73.

The male spline 53a of the annular member 53 is engaged with the female spline 73a of the outer joint member 71 to transmit the rotational torque of the constant velocity universal joint 70 to the hub wheel 51. Here, annular grooves 53c and 73b are formed in the male spline 53a and the female spline 73a, respectively.
A retaining ring 57 is bridged between c and 73b to form the outer joint member 7
1 and the annular member 53 are axially locked.

The above-described drive wheel bearing device is characterized in that the inner member 50 and the double-row rolling bearing portion 60 are previously made into subunits and can be unitized with the constant velocity universal joint 70 by one-touch operation. Further, at the time of repair and inspection, the inner member 50 and the constant velocity universal joint 70 can be separated,
The workability is improved, and some of the parts can be replaced, which has a large economic effect on the user and is highly convenient.

[0008]

However, in such a drive wheel bearing device, the annular grooves 53b, 73 formed in the male spline 53a and the female spline 73a, respectively.
In the structure in which the retaining ring 57 is bridged between b and the outer joint member 71 and the annular member 53 are axially locked, it is difficult to visually inspect the mounting state of the retaining ring 57, and in terms of product quality assurance. There is a problem in reliability. In addition, the annular member 5
3 (inner member 50) and the outer joint member 71 require a new work for separating them in the axial direction, which causes a cost increase. Therefore, some problems had to be solved in terms of reliability and cost in order to reach practical use.

The present invention has been made in view of the above circumstances, and allows the inner member and the outer joint member to be axially separable with a simple structure, and also has a low cost and a highly reliable drive wheel. It is an object of the present invention to provide a bearing device for use.

[0010]

[Means for Solving the Problems] In order to achieve the purpose,
According to a first aspect of the present invention, the inner member, the double-row rolling bearing, and the constant velocity universal joint are unitized, and at least one of the inner rolling surfaces of the double-row rolling bearing is a separate body. A bearing device for a drive wheel formed on an inner ring,
The inner member includes a hub wheel having a wheel mounting flange at one end, an inner ring fitted to the hub wheel, and an annular member having outer diameter teeth, and the inner ring is formed by the annular member and the hub wheel. The annular member is clamped and fixed to the hub wheel so that the annular member cannot rotate and cannot be separated in the axial direction, and an inner diameter tooth formed on the outer joint member of the constant velocity universal joint has an outer diameter of the annular member. In a bearing device for a drive wheel, which engages with a tooth and has an axially separable coupling means between the annular member and the outer joint member, a coupling member that engages with the outer diameter tooth and the inner diameter tooth is provided. A configuration is adopted in which the inner member or the outer joint member is detachably mounted in the radial direction.

In this way, if the connecting member engaging the outer diameter tooth and the inner diameter tooth is detachably attached to the inner member or the outer joint member in the radial direction, the retaining ring is attached as in the conventional case. The effective length of the spline does not decrease due to the annular groove formed in the, the device can be made compact, the assembly workability is improved, and the mounting condition of the connecting member can be easily inspected for appearance. Improves reliability.

When the inner ring and the annular member are integrally formed as in the second aspect of the invention, the number of parts is reduced, the assembling work is improved, and the cost and weight are reduced. it can.

Further, as in the invention described in claim 3, a small-diameter step portion is extended to the inner ring, the hub wheel is externally fitted to the small-diameter step portion, and both members are plastically coupled so that torque can be transmitted. By adopting the configuration described above, it is possible to secure a large fitting area for both members, and it has sufficient rigidity against a bending moment load generated when the vehicle turns. Therefore, steering stability and durability can be improved.

Preferably, as in the invention described in claim 4, a hardened concavo-convex portion is formed in the fitting portion of the hub wheel,
By expanding the small-diameter stepped portion into the uneven portion and biting it in, and plastically coupling the hub wheel and the inner ring, it is not necessary to provide a torque transmission means such as a spline, and both members are firmly fixed in the rotation direction and the axial direction. Can be integrated.

According to a fifth aspect of the present invention, a recess is formed in the outer diameter tooth, a through hole is formed in the outer joint member, and a set screw screwed into the through hole is provided. By engaging with the recess, both members can be securely and separably fixed with a simple structure, and durability and reliability are improved.

Further, as in the invention described in claim 6, a construction is adopted in which a through hole reaching from the outer circumference of the outer joint member to the inner circumference of the inner member is formed, and a pin is mounted in the through hole. By doing so, both members can be reliably fixed in a separable manner with a simple structure, and durability and reliability are improved.

Preferably, as in the invention described in claim 7, the pin is a split pin formed by bending and superimposing a wire material, and a tip portion of the split pin is projected from an outer periphery of the outer joint member to form a bifurcated shape. If it is curved so as to be locked to the outer periphery, the assembling workability is further improved and the cost can be reduced.

Further, as in the invention described in claim 8,
If the pin is an elastic pin that bends a wire and the curved portion is elastically locked to the inner circumference of the inner member, and the tip portion is inserted into the through hole of the outer joint member, an assembly work is performed. You can mount the pin in a small space without being restricted by space.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a vertical sectional view showing a first embodiment of a drive wheel bearing device according to the present invention.

This bearing device for a driving wheel comprises an inner member 1
The double-row rolling bearing 10 and the constant velocity universal joint 20 are unitized. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outboard side (left side in the drawing), and the side closer to the center is referred to as the inboard side (right side in the drawing).

The inner member 1 comprises a hub wheel 2 and an inner wheel 3. The hub wheel 2 has a cylindrical shape and integrally has a wheel mounting flange 4 for mounting a wheel (not shown) at an end portion on the outboard side, and an inner raceway surface 2a and a small diameter step portion 5 are formed on the outer periphery. is doing. Hub bolts 6 for fixing the wheels are planted at positions equidistantly arranged on the circumference of the wheel mounting flange 4. Further, the uneven portion 7 is formed on the inner peripheral surface of the end portion of the hub wheel 2 on the outboard side. The hub wheel 2 is made of medium carbon steel such as S53C, and has an inner raceway surface 2a, a small-diameter step portion 5, and a seal 15 described later.
A hardened layer having a surface hardness of 54 to 64 HRC is formed on the contact portion and the uneven portion 7 by heat treatment. As the heat treatment, quenching by high-frequency induction heating, which can locally heat and relatively easily set the depth of the hardened layer, is suitable.

On the other hand, the inner ring 3 has a cylindrical shape, and has an inner raceway surface 3a and a small-diameter step portion 8 formed on the outer circumference. The small-diameter step portion 8 is an inlay portion 8a which is fitted into the small-diameter step portion 5 of the hub wheel 2.
And a fitting portion 8b that engages with the uneven portion 7, and a connecting portion 9. A male spline (serration) 9a is formed on the outer periphery of the connecting portion 9, and one to three recesses 9b are formed in the axially central portion of the male spline 9a. The recess 9b may have a circular shape or an oval shape extending in the circumferential direction. Like the hub wheel 2, the inner ring 3 is made of medium carbon steel such as S53C, and the inner raceway surface 3a, the small diameter stepped portion 8 and the male spline 9a have a surface hardness of 5 by heat treatment.
A hardened layer is formed in the range of 4-64 HRC. As the heat treatment, quenching by high-frequency induction heating, which can locally heat and relatively easily set the depth of the hardened layer, is suitable. However, the fitting portion 8b of the small-diameter step portion 8 is not heat-treated and is left as it is.

The shoulder portion 3b of the inner ring 3 has a small diameter step portion 5 of the hub wheel 2.
The small-diameter stepped portion 8 is fitted into the hub wheel 2 until the end faces of the abutting portions come into abutment with each other, and the fitting portion 8b is engaged with the concave-convex portion 7.
Further, a punch (not shown) is press-fitted into the inner diameter of the fitting portion 8b, the fitting portion 8b is expanded in diameter and bites into the hardened uneven portion 7, and the hub wheel 2 and the inner ring 3 are integrally plastically coupled. . Here, the surface hardness difference between the uneven portion 7 and the fitting portion 8b is 30 HRC.
By the above, by the biting of the fitting portion 8b,
The tip of the uneven portion 7 can be firmly plastically bonded without being crushed. Further, since the small-diameter step portion 8 is extended to the inner ring 3 and the hub wheel 2 is externally fitted to the small-diameter step portion 8 and both members are plastically coupled so that torque can be transmitted, a large fitting area of both members is secured. Therefore, it has sufficient rigidity against repeated bending moment loads that occur when the vehicle turns. Therefore, steering stability and durability can be improved. Note that the configuration in which the hub wheel and the inner ring are plastically coupled is, for example, other than the example illustrated, for example, when the hub wheel and the fitting portion are fitted so that torque can be transmitted via a spline or the like, and the end portion of the fitting portion is Alternatively, both members may be fixed axially by plastically deforming outward in the radial direction to form a caulking portion.

The double-row rolling bearing 10 is provided with an outer member 11 and double-row rolling elements 12, 12, and the outer member 11 integrally has a vehicle body mounting flange 13 for mounting the knuckle N on the outer periphery. Double row of outer raceways 11a, 11a on the inner circumference
Is formed. These double rows of outer rolling surfaces 11a, 11
The inner raceway surface 2a of the hub wheel 2 and the inner raceway surface 3a of the inner race 3 are opposed to a, the double rows of rolling elements 12, 12 are accommodated therebetween, and the cages 14 and 14 made of synthetic resin are used to surround the circumference. It is held evenly distributed so that it can roll freely. Seals 15 and 16 are attached to the ends of the outer member 11 to prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater, dust and the like from the outside.

The outer member 11 is made of medium carbon steel such as S53C, and a hardened layer having a surface hardness of 54 to 64 HRC is formed on the outer raceway surface 11a by heat treatment. As the heat treatment, quenching by high-frequency induction heating, which can locally heat and relatively easily set the depth of the hardened layer, is suitable. Here, the double row rolling bearing 10 is exemplified by a double row angular contact ball bearing in which the rolling elements 12 and 12 are balls, but it is not limited to this and may be a double row tapered roller bearing in which tapered rollers are used for the rolling elements. .

The constant velocity universal joint 20 comprises an outer joint member 21, a cage C, a joint inner ring (not shown), and a torque transmission ball. The outer joint member 21 has a hollow shape and includes a cup-shaped mouth portion 22 and a shoulder portion 23 formed to have a smaller diameter than the mouth portion 22. A curved track groove 22a extending in the axial direction is formed on the inner circumference of the mouth portion 15. Female spline (serration) on the inner circumference of shoulder 23
23a is formed, and a through hole 24 is bored through the female spline 23a in the axial center thereof in the radial direction.

The outer joint member 21 is made of medium carbon steel such as S53C and has a track groove 2 formed on the inner periphery of the mouth portion 22.
2a and female spline 23a have surface hardness of 54-64HR
The hardened layer is formed in the range of C. Quenching by high frequency induction heating is preferable as the hardening treatment, but SCr415
It may be formed of case-hardening steel, and a hardened layer may be formed on the entire surface by carburizing and quenching.

A set screw 25 is screwed into a through hole 24 formed in the shoulder portion 23 of the outer joint member 21, and the tip of the set screw 25 is formed in the recess 9 formed in the male spline 9a of the connecting portion 9.
The inner ring 3 and the outer joint member 21 are positioned and fixed in the axial direction by engaging with b. A hexagonal hole is provided on the head of the set screw 25, and the set screw 25 can be attached and detached with a wrench or the like. In addition, 1 to 3 setscrews 25 may be appropriately provided depending on a desired separation force between the inner race 3 and the outer joint member 21. If the recess 9b has an oval shape extending in the circumferential direction, the phase matching with the through hole 24 becomes easy. Reference numeral 26 is an end cap made of steel plate fitted to the inner circumference of the shoulder portion 23, which prevents the lubricating grease filled in the mouth portion 22 from leaking to the outside and prevents rainwater and dust from entering from the outside. There is.

Thus, the shoulder portion 23 of the outer joint member 21
A set screw 25 is screwed into the through hole 24 formed in the inner ring 3 and the outer joint member 21 by engaging the tip of the set screw 25 with the recess 9b formed in the male spline 9a of the connecting portion 9.
By axially positioning and fixing the spline, the effective length of the spline does not decrease due to the annular groove formed for mounting the retaining ring as in the conventional case, and the device can be made compact and the assembly workability is improved. Further, the appearance of the mounting state of the set screw 25 as the connecting member can be easily checked, and the reliability of the product is improved. In addition, both members can be securely and separably fixed to each other with a simple structure, and durability and reliability are improved.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the drive wheel bearing device according to the present invention. Figure 1 above
The difference from the first embodiment shown in FIG. 3 is only the connecting structure of the inner ring and the outer joint member, and the same parts and other parts are designated by the same reference numerals, and detailed description thereof will be omitted.

This drive wheel bearing device has the above-mentioned first embodiment.
Similar to the embodiment described above, the shoulder portion 23 of the outer joint member 21 is provided with a through hole 24 that radially penetrates the female spline 23a. On the other hand, a male spline 9a is formed on the outer diameter of the connecting portion 9'of the inner ring 3 ', and the male spline 9a is formed.
A through hole 9b 'is formed to penetrate the hole in the radial direction. The phases of these through holes 24 and 9b 'are aligned and the split pin 27
Both members can be positioned and fixed in the axial direction by mounting the above from the outer circumference of the shoulder portion 23.

The split pin 27 is made of a wire material, and the center portion is bent and overlapped, and the tip portion 27a thereof is projected from the outer periphery of the shoulder portion 23, and further curved in a bifurcated shape to be locked to the outer periphery. In this way, the split pin 27 does not drop off from the outer joint member 21 during use, the assembly workability is improved, and the cost can be reduced.

FIG. 3 is a vertical cross-sectional view showing a third embodiment of the drive wheel bearing device according to the present invention. The difference from the second embodiment shown in FIG. 2 described above is only the connecting configuration of the inner ring and the outer joint member, and the same parts and other parts are designated by the same reference numerals and detailed description thereof will be omitted.

This drive wheel bearing device is provided with the above-mentioned second device.
Similar to the embodiment described above, the shoulder portion 23 of the outer joint member 21 is provided with a through hole 24 that radially penetrates the female spline 23a. On the other hand, a male spline 9a is formed on the outer diameter of the connecting portion 9'of the inner ring 3 ', and the male spline 9a is formed.
A through hole 9b 'is formed to penetrate the hole in the radial direction. The through holes 24 and 9b ′ are aligned in phase, and the elastic pin 28
Both members can be positioned and fixed in the axial direction by mounting the inner ring 3 ′ from the inner circumference.

The elastic pin 28 is formed by bending a wire into a substantially U-shape and bending the tip end portion 28b into a forked shape at a right angle.
By forming the curved portion 28a to have a diameter slightly larger than the inner diameter of the inner ring 3 ', the curved portion 28a is sandwiched and inserted while being elastically displaced as shown by a two-dot chain line in the figure. , The large diameter portion 3c formed in the tapered shape of the inner ring 3 '
The tip portion 28b is restored at the position of and is inserted into the through holes 24 and 9b '. Therefore, since the curved portion 28a of the elastic pin 28 is elastically locked to the inner periphery of the inner ring 3 ', the elastic pin 28 does not fall off from the inner ring 3'during use, and the elastic pin 28 is inserted in the structure. Therefore, there is no restriction on the assembly work space, and the elastic pin 28 can be mounted even in a narrow space. By sandwiching the curved portion 28a with a jig or the like, or by pushing the tip portion 28b inward in the radial direction, the elastic pin 28 can be easily removed at the time of repair and inspection.

FIG. 4 shows a fourth embodiment of the drive wheel bearing according to the present invention.
It is a longitudinal cross-sectional view showing an embodiment of. It should be noted that FIG.
The difference from the first embodiment shown in FIG. 6 is only the configuration of the inner member, and the same parts and other parts are designated by the same reference numerals, and detailed description thereof will be omitted.

This drive wheel bearing device is provided with an inner member 30.
The double-row rolling bearing 10 and the constant velocity universal joint 20 are unitized. The inner member 30 is a hub wheel 31.
And inner ring 32. A wheel mounting flange 33 for mounting a wheel (not shown) is integrally formed on the end portion of the hub wheel 31 on the outboard side, and an inner raceway surface 31a and a small diameter step portion 34 are formed on the outer periphery. The small-diameter step portion 34 has a press-fitting portion 34a for press-fitting an inner ring 32 and an annular member 35, which will be described later, and an engaging portion 34b. A male spline 34c is formed on the outer periphery of the engaging portion 34b.

The hub wheel 31 is made of medium carbon steel such as S53C, and the inner raceway surface 31a, the contact portion of the seal 15 and the small diameter step portion 34 have a surface hardness of 54 to 64 by heat treatment.
A hardened layer is formed in the range of HRC. As the heat treatment, quenching by high-frequency induction heating, which can locally heat and relatively easily set the depth of the hardened layer, is suitable.

The inner ring 32 has a ring shape, and an inner raceway surface 32a is formed on the outer circumference. The inner ring 32 is SUJ.
It is made of high-carbon chrome bearing steel such as No. 2 and is hardened by quenching to the core.

The annular member 35 has a male spline 35 on its outer circumference.
a, a female spline 35b is formed on the inner circumference. Also,
1 to 3 recesses 35c are formed in the axial center of the male spline 35a. The annular member 35 is the inner ring 32.
Made of high carbon chromium bearing steel such as SUJ2, medium carbon steel such as S53C, or case-hardened steel such as SCr415, and at least the surface hardness is 54 to 64 by heat treatment.
A hardened layer is formed in the range of HRC.

The female spline 35b of the annular member 35 is engaged with the male spline 34c formed in the engaging portion 34b of the hub wheel 31, and the end portion of the engaging portion 34b is plastically deformed radially outwards to form the caulking portion. 36. The caulking portion 36 holds the inner ring 32 between the shoulder portion 31b of the hub wheel 31 and the annular member 35, and positions and fixes the annular member 35 in the axial direction.
Therefore, the annular member 35 can be coupled to the hub wheel 31 in a non-rotatable manner and inseparably in the axial direction.

A female spline 23a is formed on the shoulder portion 23 of the outer joint member 21, and a through hole 24 is bored through the female spline 23a in the radial direction. After engaging the female spline 23a with the male spline 35a, the through hole 24
A set screw 25 is screwed onto the screw and the tip end thereof is engaged with the recess 35c to positionally fix the annular member 35 and the outer joint member 21 in the axial direction.

In this way, the set screw 25 which is a connecting member for engaging the female spline 23a with the male spline 35a.
If the ring member 35 and the shoulder portion 23 are detachably mounted in the radial direction, the effective length of the spline is not decreased by the annular groove formed for mounting the retaining ring as in the conventional case, and The standard inner ring made of high carbon chrome steel with excellent rolling fatigue life can be used, the mass productivity is good, and the cost can be suppressed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments and is merely an example, and is within the scope not departing from the gist of the present invention. Of course, the present invention can be implemented in various forms, and the scope of the present invention is shown by the description of the scope of claims, and the equivalent meanings described in the scope of claims and all within the scope Including changes.

[0045]

As described above in detail, in the drive wheel bearing device according to the present invention, the connecting member for engaging the outer diameter teeth and the inner diameter teeth can be attached to and detached from the inner member or the outer joint member in the radial direction. Since it has been mounted on the device, the effective length of the spline is not reduced by the annular groove formed for mounting the retaining ring as in the prior art, and the device can be made compact and the assembly workability is improved, and The appearance of the mounting state of the connecting member can be easily inspected, and the reliability of the product is improved. Further, if a small-diameter step portion is extended to the inner ring, the hub wheel is externally fitted to the small-diameter step portion, and both members are plastically coupled so that torque can be transmitted, a large fitting area of both members can be secured. In addition, it has sufficient rigidity against a bending moment load generated when the vehicle turns. Therefore, steering stability and durability can be improved. Furthermore, if a hardened concavo-convex part is formed on the fitting part of the hub wheel, and a small-diameter stepped part is expanded into this concavo-convex part and bites into it, and the hub wheel and the inner ring are plastically connected, a torque transmission means such as a spline is provided. There is no need, and both members can be firmly integrated in the rotational direction and the axial direction.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a drive wheel bearing device according to the present invention.

FIG. 2 is a vertical sectional view showing a second embodiment of the drive wheel bearing device according to the present invention.

FIG. 3 is a longitudinal sectional view showing a third embodiment of the drive wheel bearing device according to the present invention.

FIG. 4 is a vertical sectional view showing a fourth embodiment of the drive wheel bearing device according to the present invention.

FIG. 5 is a vertical sectional view showing a conventional drive wheel bearing device.

[Explanation of symbols]

1, 30 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 2,31 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 2a, 3a, 31a, 32a, inner raceway 3, 32, 3 '... Inner ring 3b, 23, 31b ... Shoulder 3c ..... Large diameter part 4, 33 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 5, 8, 34 ... Small diameter step 6 ... Hub bolt 7 ... 8a ・ ・ ・ ・ ・ ・ ・ ・ ・ Inlay part 8b ......... Mating part 9, 9 '... Connection part 9a, 34c, 35a ... Male spline 9b, 35c ......... recess 9b ', 24 ... 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Double row rolling bearing 11 ......... Outer member 11a ..... Outer rolling surface 12 ......... Rolling elements 13 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Vehicle mounting flange 14 ......... Cage 15, 16 ... Seal 20 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Universal velocity universal joint 21 ..... Outer joint member 22 ... Mouse part 22a ..... Track groove 23a, 35b ... Female spline 25 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Set screw 26 ..... End cap 27 ... 27a, 28b ... 28 --- .. Elastic pin 28a ... ・ Bending part 35 ..... annular member 36 ..... 50 ..... Inner member 51 ・ ・ ・ ・ ・ ・ ・ Hub wheel 51a, 52a ... Inside rolling surface 52 ..... inner ring 53 ・ ・ ・ ・ ・ ・ ・ Annular member 53a, 55a ... Male spline 53b, 73a ... Female spline 53c, 73b ... Annular groove 54 ......... Wheel mounting flange 55 ・ ・ ・ ・ ・ ・ ・ Small diameter step 56 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Crimping part 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retaining ring 60 ・ ・ ・ ・ ・ ・ ・ Double row rolling bearing 61 ..... Outer member 61a ..... Outer rolling surface 62 ......... Rolling elements 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Vehicle mounting flange 64, 65 ... Seals 70 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Constant velocity universal joint 71 ..... Outer joint member 72 ... Mouse part 72a .... Track groove 73 ......... Shoulder C: Cage N ... Knuckle

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16D 1/06 F16D 3/20 H 3/20 1/06 E H G J F term (reference) 3J017 AA02 BA10 CA04 DA10 DB08 HA02 3J101 AA02 AA32 AA43 AA54 AA62 AA72 BA53 BA54 BA56 BA77 FA15 FA31 FA46 FA53 GA03 GA14

Claims (8)

[Claims] 1. A drive wheel in which an inner member, a double-row rolling bearing and a constant velocity universal joint are unitized, and at least one of inner rolling surfaces of the double-row rolling bearing is formed as a separate inner ring. A bearing device, wherein the inner member includes a hub wheel having a wheel mounting flange at one end, and an annular member having an inner ring and outer diameter teeth fitted to the hub wheel, respectively.
The inner ring is clamped and fixed by the annular member and the hub wheel,
The annular member is non-rotatably and axially inseparably coupled to the hub wheel, and the inner diameter teeth formed on the outer joint member of the constant velocity universal joint are engaged with the outer diameter teeth of the annular member. Then, in the bearing device for a drive wheel in which a coupling means that is separable in the axial direction is provided between the annular member and the outer joint member, the coupling member that engages with the outer diameter tooth and the inner diameter tooth is A bearing device for a drive wheel, wherein the bearing device is mounted on a member or an outer joint member so as to be removable in a radial direction. 2. The bearing device for a drive wheel according to claim 1, wherein the inner ring and the annular member are integrated. 3. The drive wheel according to claim 1, wherein a small diameter step portion is extended to the inner ring, the hub wheel is externally fitted to the small diameter step portion, and both members are plastically coupled so that torque can be transmitted. Bearing device. 4. A hardened concavo-convex portion is formed in a fitting portion of the hub wheel, and the small-diameter stepped portion is expanded and bite into the concavo-convex portion to plastically couple the hub wheel and the inner ring. The bearing device for a drive wheel according to. 5. A recess is formed in the outer diameter tooth, a through hole is formed in the outer joint member, and a set screw screwed into the through hole is engaged with the recess. 4. The bearing device for a drive wheel according to any one of 4 above. 6. A bearing for a drive wheel according to claim 1, wherein a through hole reaching from the outer circumference of the outer joint member to the inner circumference of the inner member is formed, and a pin is mounted in the through hole. apparatus. 7. A split pin formed by bending a wire rod and polymerizing the pin, the tip end of which protrudes from the outer periphery of the outer joint member and is curved in a bifurcated shape to be locked on the outer periphery. The drive wheel bearing device described. 8. The pin is an elastic pin that bends a wire rod and elastically locks the bent portion to the inner circumference of the inner member, and the tip portion is inserted into a through hole of the outer joint member. 6
The bearing device for a drive wheel according to.