JP2023114190A - Wheel bearing device - Google Patents

Abstract

To provide a wheel bearing device which enables a tool to penetrate into a space between a pilot part of a hub wheel and a wheel or a brake rotor to prevent dirt or rust etc. from adhering to the hub wheel and increase its use-life while achieving reduction of the weight of the entire hub wheel.SOLUTION: A hub wheel 3 has a wheel pilot part 3g which extends to the outboard side farther than a wheel attachment flange 3b and guides an inner diameter surface of a wheel. A recessed part 3h having a depth of 1 to 3 mm is formed on an outer peripheral surface of the wheel pilot part 3g.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wheel bearing device.

2. Description of the Related Art Conventionally, there has been known a wheel bearing device that rotatably supports a wheel in a suspension system of an automobile or the like. 2. Description of the Related Art In some wheel bearing devices, a wheel pilot portion for guiding an inner diameter surface of a wheel is formed at an end portion of a hub wheel.

For example, in a wheel bearing device disclosed in Patent Document 1, a hub wheel is formed with a wheel pilot portion that extends toward the outboard side of a wheel mounting flange and guides the inner diameter surface of the wheel.

Further, in the wheel bearing device disclosed in Patent Document 1, concave portions having a forged surface and convex portions having a machined surface are alternately formed on the outer peripheral surface of the wheel pilot portion. ing. As a result, the weight of the hub wheel can be reduced without lowering the rigidity of the hub wheel.

Japanese Patent No. 4844967

As in the prior art, when the protrusions and recesses are provided for the purpose of weight reduction, the positions of the protrusions and recesses are not specified, and the protrusions and recesses are arranged at arbitrary positions on the outer peripheral surface of the pilot. ing. On the other hand, the wheel bearing device has a problem that the pilot portion of the hub wheel, the wheel, and the brake rotor stick together due to dirt, rust, and the like due to the usage environment and aging. When sticking occurs, a tool is inserted between the pilot portion of the hub wheel, the wheel, and the brake rotor through a recess formed on the outer peripheral surface of the pilot portion to separate the stuck portion.

If the recess and the hole for inserting the hub bolt of the wheel mounting flange are close to each other, the hub bolt and the tool will come into contact when the tool is inserted into the recess with the hub bolt installed, and the fixed part will be separated. It was sometimes difficult to make
Also, if you try to forcibly separate the stuck wheel and brake rotor, the pilot part of the hub wheel will be damaged with a tool, etc., and interference during reassembly and dust generated from the scratched part will interfere with the installation of the wheel and brake rotor. It can get into the surface and lose the perpendicularity of the mounting.
If the right angle of the wheels is lost, resistance occurs when the vehicle travels straight, which may lead to uneven wear of the tires.

The present invention has been made in view of the circumstances described above. To provide a bearing device for a wheel capable of extending service life by preventing contamination and rust of a hub wheel.

That is, an outer member having a double-row outer raceway surface formed on its inner circumference;
A hub wheel integrally having a wheel mounting flange on the outboard side and having an axially extending cylindrical small-diameter stepped portion formed on the outer periphery thereof; and at least one inner ring press-fitted into the small-diameter stepped portion of the hub wheel. an inner member having, on its outer circumference, a double-row inner raceway surface facing the double-row outer raceway surface;
A wheel bearing device comprising: a double-row rolling element rollably accommodated between both rolling surfaces,
The hub wheel has a wheel pilot portion that extends to the outboard side from the wheel mounting flange and guides the inner diameter surface of the wheel, and a recess having a depth of 1 to 3 mm is formed on the outer peripheral surface of the wheel pilot portion. be.

According to the present invention, while reducing the weight of the entire hub wheel, by making it easier to insert a tool between the pilot portion of the hub wheel, the wheel, and the brake rotor, the tool can be easily inserted between the hub wheel, the wheel, and the brake rotor. Separation becomes possible even if rust occurs and sticks.

It is a side sectional view showing a bearing device for wheels. It is a front view which shows the wheel pilot part of a hub wheel. It is a front view which shows the wheel pilot part of the hub wheel which concerns on another embodiment. It is a front partial enlarged view which shows the recessed part of a wheel pilot part. It is a front view which shows the wheel pilot part of the hub wheel which concerns on another embodiment. It is a front view which shows the wheel pilot part of the hub wheel which concerns on another embodiment. It is a front view which shows the wheel pilot part of the hub wheel which concerns on another embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments for carrying out the present invention will be described below with reference to the accompanying drawings.

[Wheel bearing device]
A wheel bearing device 1 shown in FIG. 1 is an embodiment of a wheel bearing device according to the present invention, and is for rotatably supporting a wheel in a suspension device of a vehicle such as an automobile.

The wheel bearing device 1 has a configuration called a third generation, and includes an outer ring 2 as an outer member, a hub wheel 3 and an inner ring 4 as inner members, and two rows of inner rings as rolling trains. A side ball train 5 and an outer ball train 6, a magnetic encoder 11, and a sensor holder 12 are provided.

In the following description, the axial direction means the direction along the rotation axis X of the wheel bearing device 1 . In addition, the inner side is one side in the axial direction and represents the vehicle body side of the wheel bearing device 1 when it is attached to the vehicle body, and the outer side is the other side in the axial direction when it is attached to the vehicle body. represents the wheel side of the wheel bearing device 1 of .

An inner side opening 2a into which the sensor holder 12 can be fitted is formed at the inner side end of the outer ring 2, which is the outer member. An outer-side opening 2b into which an outer-side sealing member 9 can be fitted is formed in the outer-side end portion of the outer ring 2 . A sensor holder 12 is fitted into an inner side opening 2a which is an opening at one end in the axial direction of the annular space S formed by the outer ring 2 and the hub ring 3, and the opening at the other end in the axial direction of the annular space S is fitted. By fitting the outer-side seal member 9 into the outer-side opening 2b, the annular space S inside the bearing is sealed.

An inner raceway surface 2c on the inner side and an outer raceway surface 2d on the outer side are formed on the inner peripheral surface of the outer ring 2 . A vehicle mounting flange 2e for mounting the outer ring 2 to a vehicle body member is integrally formed on the outer peripheral surface of the outer ring 2 . The vehicle body mounting flange 2e is provided with a bolt hole 2g into which a fastening member (here, a bolt) for fastening the vehicle body side member and the outer ring 2 is inserted. The outer ring 2 is located on the outer diameter side of the hub ring 3 and the inner ring 4 .

A small-diameter stepped portion 3a whose diameter is smaller than that of the outer-side end is formed on the outer peripheral surface of the inner-side end of the hub wheel 3, which is an inner member. A wheel mounting flange 3b for mounting a wheel is integrally formed on the outer side end of the hub wheel 3. As shown in FIG. The wheel mounting flange 3b is formed with bolt holes 3f, which are a plurality of insertion holes. A hub bolt 3e is press-fitted into the bolt hole 3f for fastening the hub wheel 3 and the wheel or brake component.

An outer-side inner raceway surface 3 c is provided on the outer peripheral surface of the hub wheel 3 so as to face the outer-side outer raceway surface 2 d of the outer ring 2 . That is, the inner raceway surface 3c is formed by the hub wheel 3 on the outer side of the inner member. A seal land portion 3 d of an outer side seal member 9 is formed on the base side of the wheel mounting flange 3 b of the hub wheel 3 .

The outer side seal member 9 has a core metal 91 fitted to the outer opening 2 b of the outer ring 2 and a seal member 92 integrally joined to the core metal 91 . The seal member 92 is in sliding contact with the seal land portion 3 d of the hub wheel 3 .

An inner ring 4 is provided on the small diameter step portion 3 a of the hub wheel 3 . The inner ring 4 is fixed to the small-diameter stepped portion 3a of the hub wheel 3 by press-fitting and caulking. The inner ring 4 applies preload to the inner ball row 5 and the outer ball row 6 which are rolling rows. An inner raceway surface 4 a is provided on the outer peripheral surface of the inner ring 4 so as to face the inner raceway surface 2 c of the outer ring 2 . That is, the inner raceway surface 4a is formed by the inner ring 4 on the inner side of the inner member.

The inner ring 4, which is an inner member, has an inner side end surface 4b at the inner side end portion. The hub wheel 3 has an inner side end portion formed with a crimped portion 3h which is crimped to the inner side end face 4b of the inner ring 4. As shown in FIG.

The inner ball row 5 and the outer ball row 6, which are rolling rows, are formed by holding a plurality of balls 7, which are rolling elements, by a retainer 8. As shown in FIG. The inner ball row 5 is rotatably sandwiched between the inner raceway surface 4a of the inner ring 4 and the outer raceway surface 2c of the outer ring 2 on the inner side. The outer-side ball row 6 is rollably sandwiched between the inner raceway surface 3c of the hub wheel 3 and the outer-side raceway surface 2d of the outer ring 2 . That is, the inner ball row 5 and the outer ball row 6 are housed so as to roll freely between the raceway surfaces of the outer member and the inner member. The outer ring 2 rotatably supports the hub wheel 3 and the inner ring 4 via the inner ball row 5 and the outer ball row 6 .

In the wheel bearing device 1, an outer ring 2 as an outer member, a hub ring 3 and an inner ring 4 as inner members, an inner ball row 5, and an outer ball row 6 form a double-row angular contact ball bearing. It is configured. Note that the wheel bearing device 1 may constitute a double-row tapered roller bearing instead of the double-row angular contact ball bearing.

Next, the wheel pilot portion 3g provided on the outer end surface of the hub wheel 3 will be described.

As shown in FIGS. 1 and 2, the wheel pilot portion 3g is formed by extending from the outer end surface of the wheel mounting flange 3b of the hub wheel 3 to the outer side along the axial direction. This is the part that guides the inner diameter surface.
The wheel pilot portion 3g preferably has a smooth inner surface to guide the inner diameter surface of the wheel or brake component. For example, if the inner surface of the wheel pilot portion 3g is damaged during assembly, dirt generated from the damaged portion may enter the inner diameter surface of the wheel or brake component, resulting in a loss of perpendicularity of mounting. If the mounting perpendicularity is lost, interference occurs between the inner surface of the wheel pilot portion 3g and the inner diameter surface of the wheel or brake component, resulting in abnormal noise.

The wheel pilot portion 3g is formed in a cylindrical shape. That is, the peripheral surface of the wheel pilot portion 3g is formed so as to be parallel to the rotation axis X. As shown in FIG. In addition, the wheel pilot portion 3g may be formed so that the peripheral surface thereof is inclined with respect to the rotation axis X.

The wheel pilot portion 3g is formed in a cylindrical shape, and a concave portion 3h having an arcuate cross-sectional view is provided on the outer peripheral surface of the wheel pilot portion 3g.

The recessed portion 3h is formed from the outer end surface of the outer peripheral surface of the wheel pilot portion 3g to the base end portion 3i of the wheel mounting flange 3b. Further, as shown in FIG. 1, a radius is formed at the base end portion 3i. The R dimension of the base end portion 3i, that is, the R dimension of the raised portion between the wheel mounting flange 3b and the wheel pilot portion 3g is formed to be 2 mm or more and 5 mm or less. By forming in this way, even if muddy water stays in the space between the outer peripheral surface of the wheel pilot portion 3g and the inner diameter surface of the wheel or brake component, the muddy water will be removed from the wheel mounting flange by the radius of a predetermined value or more. It becomes easy to discharge to the outside through 3b.
In addition, by setting the R dimension of the raised portion between the wheel mounting flange 3b and the wheel pilot portion 3g to 5 mm or less, it is possible to secure a clearance between the straight and rounded portion of the inner diameter portion of the brake component, and the engagement allowance between the tool and the inner diameter portion. can be properly maintained.

As shown in FIG. 4, the recess 3h is formed in an arcuate cross-sectional view. The cross-sectional shape of the recess 3h is not limited to an arc shape, and may be, for example, a partial elliptical shape in cross-sectional view.

Moreover, it is preferable that the radius of the concave portion 3h is 6 mm or more. That is, it is configured to have a radius that allows the tool to be guided into the space formed between the recessed portion 3h and the inner diameter surface of the wheel or brake component.

A chamfered portion is provided at a portion where both ends of the recess 3h in the circumferential direction are continuous with the outer peripheral surface, that is, at the edge of the outer peripheral surface of the recess 3h. The chamfered portion is processed into a curved surface shape, and it is possible to prevent the mating member from being damaged at the contact portion between the outer peripheral surface of the recessed portion 3h and the inner diameter surface of the wheel or brake component.

The recess 3h is formed to have a depth d of 1 to 3 mm from the outermost surface of the outer peripheral surface. Here, the depth d is the length from the innermost portion of the arcuate recess 3h to the outer peripheral surface in a cross-sectional view. With this configuration, the tool can be guided in the space formed between the recess 3h and the inner diameter surface of the wheel or brake component, and the rigidity of the wheel pilot portion 3g can be ensured. can be done.

Further, the recesses 3h are arranged at regular intervals along the circumferential direction when viewed in the axial direction. In other words, the recessed portions 3h are evenly distributed on concentric circles centered on the rotation axis X when viewed from the front. In FIG. 2, five recesses 3h are provided on the outer peripheral surface of the wheel pilot portion 3g, and the ratio of the total peripheral length of the recesses 3h to the outer peripheral length of the wheel pilot portion 3g is 35 to 75%. If the ratio of the total peripheral length of the recess 3h to the outer peripheral length of the wheel pilot portion 3g is less than 35%, there is no choice of where to guide the tool in the space formed between the recess 3h and the inner diameter surface of the wheel or brake component. narrows. On the other hand, if the ratio of the total circumferential length of the recessed portion 3h to the outer circumferential length of the wheel pilot portion 3g is greater than 75%, it will not be able to serve as a guide for the wheel or brake component, resulting in looseness, or , it becomes difficult to ensure perpendicularity.
By configuring the ratio of the total circumferential length of the recessed portion 3h to the outer circumferential length of the wheel pilot portion 3g to be 35 to 75%, the weight of the wheel pilot portion 3g can be reduced. It can serve as a guide for wheels or brake components.

As shown in FIG. 3, the concave portion 3h can also be arranged in a state of being out of phase with the bolt hole 3f in the circumferential direction when viewed in the axial direction. Due to the phase difference, the recess 3h and the bolt hole 3f are arranged so as not to exist on the same radius. In FIG. 3, the recess 3h is arranged on a radius that is rotated by an angle b from the radius on which the bolt hole 3f is arranged. With this configuration, the tool can be guided into the space formed between the recess 3h and the inner diameter surface of the wheel or brake component without contact between the hub bolt 3e and the tool. In the present embodiment, the number of hub bolts 3e and the number of recesses 3h are arranged to be the same, but the present invention is not limited to this.

Further, as shown in FIG. 5, the concave portion 3h can be arranged asymmetrically when viewed in the axial direction. In other words, it is also possible to arrange so that there are places where the arrangement positions along the circumferential direction of the recesses 3h are not at regular intervals. In FIG. 5, three recesses 3h are provided on the upper semicircle side, and two recesses 3h are arranged on the lower semicircle side. As a result, the center of gravity of the wheel pilot portion 3g moves downward, and the portions where sticking occurs become uneven.
When the recessed portions 3h are provided uniformly in the wheel pilot portion 3g, the recessed portions 3h may not be arranged at the places where rust occurs on the outer peripheral surface of the wheel pilot portion 3g. In this case, the problem can be solved by shortening the distance between adjacent recesses 3h and increasing the number of recesses 3h.
Therefore, it is possible to dispose the concave portions 3h unevenly, insert a tool on the side opposite to the portion where the fixing area is large, and remove the fixing by the principle of leverage. In other words, it is possible to insert a tool into the side where the distance between the recesses 3h is wide and the side where the distance between the recesses 3h is narrow, which is the opposite side, and remove the fixation by the principle of leverage.

Further, as shown in FIG. 6, it is also possible to dispose the concave portion 3h asymmetrically when viewed in the axial direction, and to provide a lightening hole 3j in the lower half portion of the wheel mounting flange 3b. In FIG. 6, four recesses 3h are provided on the upper semicircle side, and two recesses 3h are arranged on the lower semicircle side. Further, a single lightening hole 3j is arranged directly below the rotation axis X in the lower half of the wheel mounting flange 3b. Note that the number and arrangement of the lightening holes 3j are not limited to those in the embodiment. As a result, the position of the center of gravity of the wheel pilot portion 3g is adjusted, and the portions where sticking occurs become non-uniform.

Moreover, as shown in FIG. 7, a projection 13c can be provided on the inner diameter of the brake rotor 13, which is a brake component. In FIG. 7, the brake rotor 13, which is one of the brake parts, has a brake-side mounting flange 13a that joins with the wheel mounting flange 3b, and a brake rotor main body 13b that fits with the wheel pilot portion 3g. A protrusion 13c is provided on the inner diameter surface of the brake rotor main body 13b.

The protrusion 13c is formed in an arc shape in a cross-sectional view, and is arranged directly above the rotation axis X. As shown in FIG. Further, one recess 3h provided in the wheel pilot portion 3g is arranged directly above the rotation axis X. As shown in FIG. The radius of the protrusion 13c is formed to be substantially the same as or smaller than the radius of the recess 3h. With this configuration, when the brake rotor main body 13b and the wheel pilot portion 3g are fitted together, the protrusions 13c and the recessed portions 3h can be engaged with each other for alignment.

Further, in order to perform smooth fitting with the brake rotor 13, the surface roughness of the projection 13c is preferably Ra 6.3 or less. Moreover, it is preferable that the flange deflection between the wheel mounting flange 3b and the brake-side mounting flange 13a is 0.1 mm or less.

In the present embodiment, the brake rotor 13, which is a brake component, is used as a member to be fitted with the wheel pilot portion 3g, but the present invention is not limited to this. may be

It is also possible to apply a plating coating to the outer peripheral surface of the wheel pilot portion 3g. The plating coating is applied to a portion of the outer peripheral surface of the wheel pilot portion 3g that comes into contact with the wheel or brake component. By configuring in this way, it is possible to reduce the occurrence of rust between the outer peripheral surface of the wheel pilot portion 3g and the inner diameter surface of the wheel or the brake component, thereby alleviating sticking.

The wheel bearing device 1 in this embodiment is configured as a wheel bearing device 1 of a third-generation structure in which the inner raceway surface 3c is directly formed on the outer circumference of the hub wheel 3, but is limited to this. Instead, a second-generation structure in which a pair of inner rings 4 are press-fitted and fixed to the hub wheel 3 may be used.

Further, the wheel bearing device 1 of this embodiment is configured as a hub bolt type wheel bearing device 1 in which hub bolts 3e are press-fitted into bolt holes 3f, which are a plurality of insertion holes formed in the wheel mounting flange 3b. However, it is not limited to this, and it may be a wheel bolt type wheel bearing device in which a bolt is press-fitted into the mounting flange on the wheel side and a bolt hole for screwing the bolt is provided on the hub wheel side.
In this case, since there is no need to arrange hub bolts on the side of the wheel mounting flange 3b, the concave portion 3h may be arranged at any position.

Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments in any way, and is merely an example. Of course, the scope of the present invention is indicated by the description of the claims, and the meaning of equivalents described in the claims and all changes within the scope include.

1 Wheel bearing device 2 Outer ring 2a Inner side opening 2c (Inner side) Outer raceway surface 2d (Outer side) Outer raceway surface 3 Hub ring 3a Small diameter stepped portion 3c (Hub ring) Inner raceway surface 3d Seal land 3e hub bolt 3f bolt hole 3g wheel pilot portion 3h concave portion 3i base end portion 3j lightening hole 4 inner ring 4a (inner ring) inner raceway surface 5 inner side ball row 6 outer side ball row 11 magnetic encoder 12 sensor holder 13 brake rotor 13a brake side Mounting flange 13b Brake rotor body 13c Protrusion

Claims (8)

an outer member having a double-row outer raceway surface formed on its inner periphery;
A hub wheel integrally having a wheel mounting flange on the outboard side and having an axially extending cylindrical small-diameter stepped portion formed on the outer periphery thereof; and at least one inner ring press-fitted into the small-diameter stepped portion of the hub wheel. an inner member having, on its outer circumference, a double-row inner raceway surface facing the double-row outer raceway surface;
A wheel bearing device comprising: a double-row rolling element rollably accommodated between both rolling surfaces,
The hub wheel has a wheel pilot portion that extends to the outboard side from the wheel mounting flange and guides the inner diameter surface of the wheel, and a recess having a depth of 1 to 3 mm is formed on the outer peripheral surface of the wheel pilot portion. A wheel bearing device characterized by: 2. A wheel bearing device according to claim 1, wherein an insertion hole for inserting a hub bolt is provided in said wheel mounting flange, and said insertion hole and said concave portion are out of phase with each other in the circumferential direction when viewed in the axial direction. The recesses are arranged asymmetrically about the axial direction,
3. The wheel bearing device according to claim 1, wherein the wheel mounting flange is provided with a lightening hole for adjusting the position of the center of gravity of the hub wheel. The wheel bearing device according to any one of claims 1 to 3, wherein a ratio of the total peripheral length of the recess to the peripheral length of the wheel pilot is 35 to 75%. The wheel bearing device according to any one of claims 1 to 4, wherein the R dimension of the raised portion between the wheel mounting flange and the wheel pilot portion is set to 2 mm or more and 5 mm or less. The wheel bearing device according to any one of claims 1 to 5, wherein a chamfered portion is provided on an outer peripheral surface side edge of the recess. The wheel bearing device according to any one of claims 1 to 6, wherein a plated surface is formed on the outer peripheral surface of the wheel pilot by painting. 2. A wheel bearing device according to claim 1, wherein a bolt hole for screwing a wheel bolt is provided in said wheel mounting flange.

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