JP2003120704A - Wheel shaft support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing structure of a wheel shaft for reducing a part cost, improving assembling efficiency, and reducing a manufacturing cost. SOLUTION: A circumferential groove 38 is arranged on an end surface of an outer race 28b of a radial bearing 28 facing to the outside. A cross-sectional U-shaped seal body 42 is arranged so as to integrally rotate with an axle shaft by inserting a large diameter annular part 42c into the circumferential groove, and inserting a small diameter annular part 42b into bearing clearance C between an inner race 28a and the outer race of the radial bearing. The bearing clearance is blocked up by a cover part 42a of the seal body and an annular ring-shaped lip seal member 44 engaged with the small diameter annular part. A rotor part 46 of a rotating speed detecting device for measuring a rotating speed of the axle shaft is arranged on an outer peripheral surface of the large diameter annular part of the seal body. A sensor part 36 for detecting rotating speed information from the rotor part is arranged in a position opposed to the rotor part in the outer race.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle support structure including parts of a vehicle wheel speed detecting device.

[0002]

2. Description of the Related Art As a conventional technique of an axle support structure, for example, a technique described in Japanese Patent Laid-Open No. 09-42466 is known.
In this prior art, as shown in FIG. 8, the tubular portion 4a of the wheel hub 4 is fixed to the outer periphery of the front end of the axle shaft 2 by spline coupling, and the steering knuckle 8 is attached to the outer periphery of the tubular portion 4a via a radial bearing 6. By arranging, the rotational driving force of the axle shaft 2 is transmitted to the wheel hub 4 without being transmitted to the steering knuckle 8 and the wheel (not shown) is rotationally driven.

On the outer peripheral portion of the axle shaft 2 near one end of the steering knuckle 8, a rotor portion of a wheel rotation speed detecting device used in an antilock brake system (ABS) (referred to as a sensor ring in the prior art). 10 is fixed. In addition, this rotor unit 10
A seal member (an oil seal member in the related art) 12 is arranged near one end of the radial bearing 6 at the end. The seal member 12 is provided on the axle shaft 2 facing the inner circumference on one end side of the steering knuckle 8.
Step 2a provided on the step and an annular groove 2b communicating with the step 2a
The cylindrical main body portion 14 which is fitted to the inner peripheral surface of the steering knuckle 8 while the one end portion 14a is inserted into the annular groove 2b and the other end portion 14b is located inside the step 2a. It is composed of a rubber-like ring-shaped lip portion 16 engaged with the other end portion 14b of the tubular main body portion 14.

When the axle shaft 2 rotates, the ring-shaped lip portion 16 is formed on the surface forming the step 2a.
Since the tubular main body portion 14 partitions the rotor portion 10 side and the radial bearing 6 while sliding, the radial bearing 6 can be used even if muddy water, dust, etc. scattered from the wheel or the like moves to the rotor portion 10 side. Penetration into 6 is suppressed.

[0005]

When assembling the bearing structure of the axle shaft 2 described above, the seal member 12 is fitted to the inner peripheral surface of the steering knuckle 8 on one end side, and then the axle shaft 2 is mounted. The outer circumference of the tip of the wheel is splined to the tubular portion 4a of the wheel hub 4. When the work is performed in this procedure, the one end portion 14a of the tubular main body portion 14 protruding from the one end side end surface of the steering knuckle 8 interferes with the surface of the step 2a, and the assembly work may not be smoothly performed.

In the bearing structure of the axle shaft 2 described above, the number of assembly parts such as the seal member 12 arranged in the step 2a and the annular groove 2b and the rotor portion 10 fixed to the outer periphery of the axle shaft 2 is small. Since many and many assembly processes are required, there is a problem in terms of manufacturing cost. Therefore, the present invention has been made in view of the above circumstances, the parts can be easily assembled without interference,
Moreover, it is an object of the present invention to provide an axle support structure that can reduce the cost of parts and the assembly efficiency by reducing the number of parts, and can reduce the manufacturing cost.

[0007]

Therefore, the invention according to claim 1 of the present application comprises an axle side member that rotates integrally with the axle, and a bearing arranged on the outer peripheral side of the axle side member.
A vehicle body side member that is fixed to the vehicle body and that rotatably supports the axle side member via the bearing, in an axle support structure, a circle on a side surface of the vehicle body side member that forms an outer peripheral portion of the bearing. A small-diameter annular portion engaged with the axle-side member so as to rotate integrally with the axle, provided with a storage portion formed of a circumferentially continuous groove or step,
A ring-shaped member having a large-diameter annular portion that is inserted into the housing portion and a connecting portion that connects the small-diameter annular portion and the large-diameter annular portion is disposed, and rotation speed detection that detects the rotation speed of the axle is performed. A rotor portion of the device is arranged on an outer peripheral surface of the large-diameter annular portion, and a sensor portion for detecting rotation speed information from the rotor portion is arranged at a position facing the rotor.

Further, the invention according to claim 2 of the present application is, in the axle support structure according to claim 1, located at a position facing the opening side of the accommodating portion, radially inward from the inner diameter portion of the vehicle body side member. A cover wall is provided that extends and covers the side surface of the accommodation portion. The invention according to claim 3 of the present application is
Alternatively, in the axle support structure according to the second aspect, the ring-shaped member has a shape that covers a side surface of the housing portion at a position facing the opening side of the housing portion.

According to a fourth aspect of the present invention, in the axle support structure according to any of the first to third aspects, the invention is located on the inner diameter side of the accommodating portion formed of the circumferentially continuous groove. The inner diameter side end surface of the side surface side of the bearing is larger than the thickness of the ring-shaped member as compared with the outer diameter side end surface of the side surface side of the bearing located on the outer diameter side of the accommodating portion, and It is formed as a concave surface, and the ring-shaped member is arranged so as not to project to the side surface side of the bearing from the outer diameter side end surface.

According to a fifth aspect of the present invention, in the axle support structure according to any one of the first to fourth aspects, the sensor portion for detecting the rotational speed information from the rotor portion is constituted by the vehicle body side member. The bearing is passed through the mounting hole formed in the axial direction from the outer peripheral portion of the outer ring of the bearing, and penetrates into the circumferentially continuous groove or step, and the mounting hole is drilled. The outer peripheral portion of the outer ring is formed into a flat surface by scraping off the outer periphery of the cylindrical outer ring.

Further, the invention according to claim 6 is the same as claim 1.
In the axle support structure according to any one of 1 to 5, the rotor portion arranged on the outer peripheral surface of the large-diameter annular portion of the ring-shaped member is composed of a magnet rotor in which N poles and S poles are alternately continuous in the circumferential direction. did.

[0012]

According to the first aspect of the invention, since the connecting portion connecting the small-diameter annular portion and the large-diameter annular portion of the ring-shaped member covers the side surface side of the bearing, it has scattered from the outside of the axle. It is possible to prevent muddy water, dust, and the like from entering the rolling element side of the bearing through the bearing gap. Further, by arranging the rotor portion on the outer peripheral surface of the large-diameter annular portion, the ring-shaped member for preventing the intrusion of muddy water, dust, etc.
Since it also functions as a component of the rotation speed detecting device, the number of assembled components can be reduced as compared with the conventional structure.

According to the second aspect of the present invention, a side surface of the accommodating portion is provided at a position facing the opening side of the accommodating portion, extending radially inward from the inner diameter portion of the vehicle body side member. By the cover wall provided in this manner, infiltration of muddy water, dust, etc. into the circumferentially continuous groove or step in which the rotor part is arranged can be suppressed, so that the rotor part can be more reliably prevented from becoming dirty and Since the muddy water does not flow from the circumferentially continuous groove or the step to the bearing gap, it is possible to further improve the sealing performance on the rolling element side of the bearing.

Further, according to the third aspect of the invention, the ring-shaped member covers the side surface of the accommodating portion at a position facing the opening side of the accommodating portion, so that the sealability of the bearing gap is reliably ensured. In addition, the cost can be reduced as compared with the case where the vehicle body side member is provided with the cover wall. In addition, claim 4
According to the described invention, when the bearing is assembled to a component member such as an axle side member or a vehicle body side member, the ring-shaped member is
Since the bearing is arranged so as not to project to the side surface side from the outer diameter side end surface, the constituent members and the ring-shaped member do not interfere with each other, and the assembling work can be easily performed.

Further, according to the present invention, the mounting hole can be easily and accurately formed with the flat surface formed on the outer periphery of the outer ring as the reference surface, so that the workability of the component can be improved. . Further, according to the invention of claim 6, since the magnet rotor of a thin member that does not affect the layout of other components is used, even if the rotation speed detection device is provided, a large structure for supporting the axle is provided. Can be suppressed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an axle support structure according to the present invention will be described below with reference to the drawings. First, the axle support structure of the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is an axial cross-sectional view showing a structure of a connecting portion between an axle shaft and a wheel of an automobile equipped with an anti-lock brake system.
2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is an enlarged cross-sectional view of a main part.

A wheel hub indicated by reference numeral 20 in FIG. 1 is composed of a hub flange portion 20a to which a wheel disc 22 is attached by tightening bolts 23, and a hub tubular portion 20b. In the hub tubular portion 20b, the outer periphery of the tip end side of the axle shaft 24 is spline-joined, and the nut 26 is screwed into the tip screw portion of the axle shaft 24,
The wheel hub 20 rotates together with the axle shaft 24.

An end of a steering knuckle 30 is connected to the outer circumference of the hub tubular portion 20b via a radial bearing 28. The radial bearing 28 includes a hub tubular portion 20b and an inner ring 28a fixed to the outer periphery thereof.
An outer ring 28b and an inner ring 28a fixed to the annular portion provided at the end of the steering knuckle 30 with a connecting bolt 29.
And a large number of rolling elements 28c held between the hub tubular portion 20b and the raceway surface of the outer ring 28b. Here, the raceway surface of the outer ring 28b is provided in two rows spaced apart in the axial direction, and the raceway surface of the outer ring 28b in one row faces the rolling surface of the inner ring 28a and holds the rolling element 28c,
The raceway surface of the outer ring 28b of the other row faces the raceway surface formed on the outer circumference of the hub tubular portion 20b and holds the rolling element 28c.

The inner ring 28a of the radial bearing 28
In the gap between both ends of the rolling element 2 and the outer ring 28b
It is sealed so that it does not enter the 8c side. That is,
When the right end of the radial bearing 28 in FIG. 1 is one end and the left end of the radial bearing 28 in FIG. 1 is the other end, the gap on the one end opening on the hub flange portion 20a side is an annular shape. A gap on the other end side that is sealed by the packing member 32 and is open on the end side of the steering knuckle 30 (bearing gap C described later).
Are sealed by the seal portion 34.

Here, as shown in FIG. 2, the steering knuckle 30 is embedded with a sensor portion 36 which constitutes a wheel rotation speed detecting device of an antilock brake system (hereinafter referred to as ABS). The seal portion 34 includes a rotor portion that causes the sensor portion 36 to detect the number of rotations of the wheel by rotating in synchronization with the axle shaft 24 at a position facing the sensor portion 36. Figure 3
Shows a specific configuration of the seal portion 34.

The seal portion 34 is a radial bearing 28.
An annular circumferential groove 38 is formed on the end surface of the outer ring 28b on the other end side. The sensor portion 36 embedded in the steering knuckle 30 passes through a mounting hole 37 formed in the outer peripheral portion 39 of the outer ring 28b in the axial direction and penetrates into an annular circumferential groove 38 for mounting. Here, the outer peripheral portion 39 having the mounting hole 37 formed therein has a flat surface shape by scraping off the outer periphery of the curved outer ring 28b.

A seal body 42 for closing the bearing gap C between the inner ring 28a and the outer ring 28b is arranged, and a ring-shaped lip seal member 44 made of an elastic material such as rubber is provided in the seal body 42. It is installed. The seal body 42 is a metal member having an annular appearance and a U-shaped cross section, and has a ring-shaped cover portion 42a that closes the bearing gap C from the outside, and an inner circumference of the cover portion 42a. A small-diameter annular portion 42b that extends at a right angle from the end and enters the bearing gap C and a small-diameter annular portion 42b that extends at a right angle from the outer peripheral end of the cover portion 42a and extend in parallel with the small-diameter annular portion 42b. , Circumferential groove 3
8 and a large-diameter annular portion 42c that is loosely inserted in

The small-diameter annular portion 42b has a diameter substantially the same as the outer diameter of the inner ring 28a, and is fitted into the outer periphery of the inner ring 28a while entering the bearing gap C. The tip portion 42d of the small-diameter annular portion 42b is folded up so as not to contact the outer periphery of the inner ring 28a, and the engagement portion 44a of the lip seal member 44 is connected so as to wrap around the folded tip portion 42d. . In the lip seal member 44 connected to the small-diameter annular portion 42b, the ring-shaped lip portion 44b extending inward in the radial direction is constantly in contact with the inner peripheral surface of the outer ring 28b. As a result, the seal body 42 is
Rotating in synchronization with the axle shaft 24, the lip portion 44b of the lip seal member 44 slides on the inner peripheral surface of the outer ring 28b.

Further, a rotor portion 46 for causing the above-mentioned sensor portion 36 to detect the number of rotations of the wheel is arranged on the entire area of the outer circumference of the large-diameter annular portion 42c in the circumferential direction. The rotor portion 46 is a magnet rotor in which N poles and S poles are alternately continuous (hereinafter referred to as a magnet rotor 46), and when the seal body 42 rotates in synchronization with the rotation of the axle shaft 24, the magnet The rotation speed of the wheel is detected by the sensor unit 36 detecting the change in the magnetic flux of the rotor 46.

Further, as shown in FIG. 3, an annular circumferential groove 3 is formed.
No. 8 inner diameter side end surface 48a of the outer ring 28b located on the inner diameter side
Is formed as a surface recessed inward (one end side) by a predetermined axial dimension h, as compared with the outer diameter side end surface 48b located on the outer diameter side of the annular circumferential groove 38. The shaft dimension h
Is larger than the thickness of the cover portion 42a of the seal body 42. Accordingly, when the seal body 42 is mounted, the cover portion 42a arranged along the inner diameter side end surface 48a is disposed.
Has a structure that does not project to the other end side (left side in FIG. 3) from the outer diameter side end surface 48b.

Further, a ring-shaped knuckle cover wall 30a is formed at the end of the steering knuckle 30 so as to cover from outside the opening of the circumferential groove 38 into which the large-diameter annular portion 42c of the seal body 42 is loosely inserted. Has been done. According to the structure described above, the seal body 42 of the seal portion 34 that rotates in synchronization with the axle shaft 24 closes the bearing gap C from the outside, so that muddy water, dust, etc. scattered from the outside intrude toward the bearing gap C. Even if an attempt is made, it is possible to suppress the intrusion to the rolling element 28c side. Also,
Since the lip seal member 44 engaged with the small-diameter annular portion 42b of the seal body 42 is also slidably arranged on the inner peripheral surface of the outer ring 28b, the sealability of the bearing clearance C can be more reliably obtained.

The knuckle cover wall 30a provided at the end of the steering knuckle 30 also covers the opening of the circumferential groove 38 into which the large-diameter annular portion 42c of the seal body 42 is loosely inserted from the outside, so that muddy water and dust can be prevented. Magnet rotor 4 by etc.
6 can be prevented from being soiled. And the circumferential groove 38
Since there is no possibility that muddy water will flow from the side to the bearing gap, it is possible to more reliably suppress the intrusion of muddy water, dust and the like into the rolling element 28c side.

The seal body 42 of the seal portion 34 is
As described above, the function of sealing muddy water, dust, etc. is ensured, and the magnet rotor 46 is arranged on the outer periphery of the large-diameter annular portion 42c, so that it also functions as a rotor of the ABS wheel rotation speed detecting device. Therefore, in this embodiment, since the component (seal body 42) having both the sealing function and the function of the wheel rotation speed detecting device is used, the number of assembling components is reduced as compared with the conventional structure, It is possible to reduce the cost of parts, improve the assembly efficiency, and reduce the manufacturing cost.

Also, the outer ring 28 of the radial bearing 28
When b is connected to the end of the steering knuckle 30 and assembled, the cover portion 42a of the seal body 42 that closes the bearing gap C projects forward from the outer diameter side end surface 48b of the outer ring 28b in the assembly direction. Not so
For example, the cover portion 42a does not interfere with the knuckle cover wall 30a of the steering knuckle 30. Therefore, the parts do not interfere with each other and the assembly work can be easily performed.

Further, on the outer circumference of the large-diameter annular portion 42c, the N pole,
By arranging the magnet rotors 46 in which the S poles are alternately continuous, the rotor portion is a thin member that does not affect the layout of other components. Therefore, even if the ABS wheel rotation speed detection device is provided, it is possible to prevent the bearing seal structure from increasing in size. Further, in order to penetrate the sensor portion 36 of the ABS, the radial bearing 2
The outer ring 28b of No. 8 has a mounting hole 37 formed on the outer periphery 28 of the flat surface formed by scraping off the outer periphery of the curved outer ring 28b.
Since it is formed on 9, the mounting hole 3 can be easily and accurately formed.
7 can be formed. As a result, the workability of the component is improved and the reduction of the manufacturing cost can be promoted.

Next, FIG. 4 shows an axle support structure of the second embodiment. The same components as those of the first embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals and the description thereof will be omitted. The seal portion 50 that seals the bearing clearance C of the present embodiment includes the inner ring 28a and the outer ring 2
Seal body 52 for closing the bearing gap C between 8b
And a ring-shaped lip seal member 44 made of an elastic material such as rubber is attached to the seal body 52.

The seal body 52 has a ring-shaped cover portion 52a that closes the bearing gap C from the outside, and extends at a right angle from the inner peripheral end of the cover portion 52a. Small diameter annular part 5
2b and a large-diameter annular portion 52c that is integrally provided on the outer peripheral side of the cover portion 52a and is loosely inserted into the circumferential groove 38. The cover portion 52a of the present embodiment has a shape elongated in the radial direction so as to cover the opening of the circumferential groove 38 from the outside. The large-diameter annular portion 52c is a member having a cross section L having a cylindrical portion 52C1 and an annular flange portion 52C2 extending from one end of the cylindrical portion 52C1 in the outer peripheral direction, and the flange portion 52C2 is a cover portion. The outer peripheral surface of 52a is integrated by spot welding or the like. Note that the cover portion 52a and the large-diameter annular portion 52c may be integrally formed if production technology allows.

Here, the small-diameter annular portion 52b is engaged with the inner ring 28a so as to rotate integrally therewith, and the cylindrical portion 52C1 is formed into the circumferential groove 3.
8, the small diameter annular portion 52b may not be bent at a right angle from the inner peripheral end of the cover portion 52a, or the small diameter annular portion 52b and the cylindrical portion 52C1 may extend in parallel with each other. You don't have to. Further, in this embodiment, the knuckle cover wall 30a on the end side of the steering knuckle 30 formed in the structure of the first embodiment is not provided.

According to the structure described above, the same effect as that of the first embodiment can be obtained, and the seal main body 52 can be obtained.
Since the cover portion 52a of the has a shape that is long in the radial direction so as to cover the circumferential groove 38 from the outside, muddy water, dust, etc. scattered from the outside do not enter the circumferential groove 38, and forcibly,
Infiltration into the bearing gap C can be suppressed.
Next, FIG. 5 shows an axle support structure of the third embodiment. Also in this embodiment, the same components as those of the first embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals and the description thereof will be omitted.

The seal portion 60 for sealing the bearing gap C of the present embodiment has a seal body 62 for closing the bearing gap C between the inner ring 28a and the outer ring 28b, and a lip seal member 64 for the seal body 62.
Is installed. The seal body 62 is a metal member having an annular appearance and a U-shaped cross section, and a ring-shaped cover portion 62 that closes the bearing gap C from the outside.
a, a small-diameter annular portion 62b bent and extending at a right angle from the inner peripheral end portion of the cover portion 62a and entering the bearing gap C, and a small-diameter annular portion 62b bent at a right angle from the outer peripheral end portion of the cover portion 62a. The large-diameter annular portion 62c extends in parallel with the annular portion 62b and is loosely inserted into the circumferential groove 38.

The small diameter annular portion 62b is engaged with the inner ring 28a so as to rotate integrally therewith, and the large diameter annular portion 62c is engaged with the circumferential groove 3.
8, the small-diameter annular portion 62b and the large-diameter annular portion 62c do not have to be bent at a right angle from the cover portion 62a, and the small-diameter annular portion 62b and the cylindrical portion 62.
c does not have to extend parallel to each other. The small-diameter annular portion 62b is a plate-like portion that is flat to the tip, and the lip portion 6 of the lip seal member 64 is provided on the inner peripheral surface of the small-diameter annular portion 62b.
4a is in contact.

The lip seal member 64 is an annular member made of an elastic material such as rubber. The lip portion 64a is formed on the inner peripheral side and the lip core member 6 is formed on the outer peripheral side.
4b is integrated by vulcanization adhesion or the like. Then, when the lip core member 64b is fitted to the inner peripheral surface of the outer ring 28b and the seal body 62 rotates with the rotation of the axle shaft 24, the lip portion 64a slides on the inner peripheral surface of the small diameter annular portion 62b. According to the above configuration, the seal body 62 that rotates in synchronization with the axle shaft 24 closes the bearing gap C from the outside, and the lip portion 64a of the lip seal member 64 fixed to the outer ring 28b is on the inner peripheral surface of the small diameter annular portion 42b. Therefore, even if muddy water, dust, or the like scattered from the outside tries to invade toward the bearing clearance C, it is possible to suppress the intrusion to the rolling element 28c side.

Next, FIG. 6 shows a first modification of the first embodiment. The seal portion 70 that seals the bearing clearance C of the present embodiment has a circumferentially continuous step 72 formed on the outer periphery of the other end side of the outer ring 28b, and the sensor portion 36 embedded in the steering knuckle 30 is It is mounted so as to penetrate into the step 72. A seal body 42 that closes the bearing gap C between the inner ring 28a and the outer ring 28b is arranged, and the large-diameter annular portion 42c of the seal body 42 is loosely inserted on the step 72.

According to the above-mentioned structure, the seal main body 42 of the seal portion 34 that rotates in synchronization with the axle shaft 24 closes the bearing gap C from the outside and engages with the small diameter annular portion 42b of the seal main body 42. Since 44 is also slidably arranged on the inner peripheral surface of the outer ring 28b,
Muddy water, dust, etc. scattered from the outside is the bearing clearance C
Even if an attempt is made to invade the rolling element 28c, it is possible to suppress intrusion to the rolling element 28c side.

Further, the knuckle cover wall 30a provided at the end portion of the steering knuckle 30 also covers the step 72 in which the large-diameter annular portion 42c of the seal main body 42 is loosely inserted from the outside, so that the rolling is more reliable. It is possible to suppress infiltration of muddy water, dust and the like into the moving body 28c side. Then, it is possible to obtain the same effects as those of the other embodiments. Furthermore, what is shown in FIG. 7 shows a second modification of the first embodiment.

The seal portion 80 for sealing the bearing gap C of the present embodiment is provided on the inner circumference of the end surface on the other end side of the outer ring 28b.
A circumferentially continuous step 82 is formed, and the sensor portion 36 embedded in the steering knuckle 30 is attached to the outer ring 28.
The mounting hole 37 formed in the axial direction from the outer peripheral portion 39 of b.
It is attached by penetrating through the inside of the step 82. Then, the bearing gap C between the inner ring 28a and the outer ring 28b
A seal body 42 that closes the seal body 42 is arranged, and a large-diameter annular portion 42c of the seal body 42 is loosely inserted in the step 82.

According to the above-mentioned structure, the seal main body 42 of the seal portion 34 which rotates in synchronization with the axle shaft 24 closes the bearing gap C from the outside and engages with the small diameter annular portion 42b of the seal main body 42. Since 44 is also slidably arranged on the inner peripheral surface of the outer ring 28b,
Muddy water, dust, etc. scattered from the outside is the bearing clearance C
Even if an attempt is made to invade the rolling element 28c, it is possible to suppress intrusion to the rolling element 28c side.

Further, the knuckle cover wall 30a provided at the end portion of the steering knuckle 30 also covers the step 82 in which the large-diameter annular portion 42c of the seal body 42 is loosely inserted from the outside, so that the rolling is more reliable. It is possible to suppress infiltration of muddy water, dust and the like into the moving body 28c side. And this embodiment can also obtain the same operation effect as other embodiments.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a first embodiment of a connecting portion between an axle shaft and a wheel of an automobile equipped with an anti-lock brake system according to the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a cross-sectional view showing the main parts of the first embodiment.

FIG. 4 is a cross-sectional view showing a main part of a second embodiment according to the present invention.

FIG. 5 is a sectional view showing a main part of a third embodiment according to the present invention.

FIG. 6 is a sectional view showing a first modification of the above-described first embodiment.

FIG. 7 is a sectional view showing a second modification of the first embodiment described above.

FIG. 8 is a sectional view showing a conventional axle support structure.

[Explanation of symbols]

20 wheel hub 20a hub flange part 20a hub tubular part (axle side member) 24 axle shaft (axle) 26 nut 28 radial bearing (bearing) 28a inner ring 28b outer ring (body side member) 28c rolling element 30 steering knuckle 30a knuckle cover wall (Cover wall) 34, 50, 60, 70, 80 Seal part 36 Sensor part 37 Mounting hole 38 Circumferentially continuous groove (accommodating part) 39 Outer peripheral part 42, 52, 62 Seal body (ring-shaped member) 42a, 52a, 62a Cover portion (connecting portion) 42b, 52b, 62b Small diameter annular portion 42c, 52c, 62c Large diameter annular portion 42d Tip portion 44, 64 Lip seal member 44b Lip portion 44a Engaging portion 46 Magnet rotor (rotor portion) 48a Outer ring inner diameter side end surface (bearing side surface side inner diameter side end surface) Outer diameter side end face of the 8b outer step continuous to 64b lip core 64a lip 72 and 82 circumferential (outer diameter side end face of the side face of the bearing) (accommodating portion) C Bearing Clearance

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16C 33/78 F16C 33/78 Z F16J 15/447 F16J 15/447

Claims (6)

[Claims] 1. An axle side member that rotates integrally with an axle, a bearing arranged on the outer peripheral side of the axle side member, and a bearing fixed to the vehicle body and rotatably supporting the axle side member via the bearing. In the axle support structure having a body-side member to be provided, a housing portion including a circumferentially continuous groove or step is provided on a side surface of the body-side member that forms an outer peripheral portion of the bearing, and is integrally formed with the axle. It has a small diameter annular portion engaged with the axle side member so as to rotate, a large diameter annular portion inserted into the accommodation portion, and a connecting portion connecting the small diameter annular portion and the large diameter annular portion. A ring-shaped member is arranged, and the rotor portion of the rotation speed detection device for detecting the rotation speed of the axle is
An axle support structure characterized in that a sensor portion arranged on an outer peripheral surface of the large-diameter annular portion and detecting rotation speed information from the rotor portion is arranged at a position facing the rotor. 2. At a position facing the opening side of the accommodation portion,
The axle support structure according to claim 1, further comprising a cover wall that extends radially inward from an inner diameter portion of the vehicle body side member and covers a side surface of the housing portion. 3. The axle support structure according to claim 1, wherein the ring-shaped member has a shape that covers a side surface of the housing portion at a position facing the opening side of the housing portion. . 4. An inner diameter side end surface on the side surface side of the bearing located on the inner diameter side of the accommodating portion formed of the circumferentially continuous groove is a side surface side of the bearing located on the outer diameter side of the accommodating portion. Is formed as an inwardly concave surface with a dimension larger than the thickness of the ring-shaped member as compared with the outer diameter-side end surface, and the ring-shaped member is closer to the side surface side of the bearing than the outer diameter-side end surface. The axle support structure according to any one of claims 1 to 3, wherein the axle support structure is arranged so that it does not project to the outside. 5. A sensor unit for detecting rotational speed information from the rotor unit passes through a mounting hole axially formed from an outer peripheral portion of an outer ring of the bearing formed by the vehicle body side member, The outer peripheral portion of the outer ring is mounted so as to penetrate into a groove or a step that is continuous in a circumferential shape, and the outer peripheral portion of the outer ring, which has the mounting hole, is formed into a flat surface shape by scraping off the outer periphery of the cylindrical outer ring. The axle support structure according to any one of claims 1 to 4, wherein: 6. The rotor portion arranged on the outer peripheral surface of the large-diameter annular portion of the ring-shaped member is a magnet rotor in which N poles and S poles are alternately continuous in the circumferential direction. The axle support structure according to any one of 1 to 5.