KR102522187B1 - Wheel bearing assembly and device to prevent entry of foreign substances into wheel bearings - Google Patents

Abstract

The present invention relates to a technology for reducing drag torque of a wheel bearing and satisfying sealing properties through a structure covering the seal of the wheel bearing, comprising: a wheel bearing inserted into an outer circumferential surface of a hub housing; A wheel bearing assembly including a dust cover provided in a shape covering a sealing section formed between an inner ring and an outer ring of the wheel bearing and a mechanism for preventing the inflow of foreign substances for the wheel bearing are introduced.

Description

Wheel bearing assembly and device to prevent entry of foreign substances into wheel bearings}

The present invention relates to a wheel bearing assembly that satisfies sealing performance while reducing drag torque of the wheel bearing through a structure covering the seal of the wheel bearing, and a mechanism for preventing the inflow of foreign substances for the wheel bearing.

In the case of the existing hub and constant velocity joint, each is manufactured separately, and the outer race of the constant velocity joint is combined with a spline while penetrating the hub. And, as the hub nut is fastened to the end of the outer race penetrating the hub, the constant velocity joint and the hub are coupled to each other.

On the other hand, the vehicle's weight continues to increase due to the increased installation of safety, performance, and convenience systems in the vehicle, and the lifespan and stiffness of the wheel bearing are also upwardly adjusted according to this trend.

In order to increase the lifespan and rigidity of wheel bearings, it is necessary to apply high-stiffness/high-strength materials or increase the bearing size (PCD). However, development of high-stiffness/high-strength materials is not an item that can be solved in a short period of time, so generally the size of wheel bearings to satisfy the goal of increasing lifespan and rigidity.

However, the increase in the size of the wheel bearing acts as a factor to increase the drag torque of the bearing, and eventually adversely affects the fuel efficiency of the vehicle.

Therefore, although the drag torque of the bearing can be reduced by changing the structure of the bearing seal responsible for the sealing performance of the bearing, there is a problem that foreign substances may be introduced into the bearing when the sealing performance of the bearing is deteriorated.

That is, the sealing performance of the bearing and the drag torque are in a trade-off relationship. When the sealing performance of the bearing is improved, the drag torque deteriorates, and when the drag torque of the bearing is improved, the sealing performance of the bearing deteriorates, so it is difficult to satisfy both performances at the same time. there is

The matters described as the background art above are only for improving understanding of the background of the present invention, and should not be taken as an admission that they correspond to prior art already known to those skilled in the art.

KR 10-0924717 B

The present invention has been made to solve the problems described above, and a wheel bearing assembly that satisfies the sealing property while reducing the drag torque of the wheel bearing through a structure covering the seal of the wheel bearing and a mechanism for preventing the inflow of foreign substances for the wheel bearing is to provide

The configuration of the present invention for achieving the above object is a wheel bearing inserted into the outer circumferential surface of the hub housing; It may be characterized by including; a dust cover provided in a shape to cover a sealing section formed between the inner ring and the outer ring of the wheel bearing.

The dust cover may be provided along the circumferential direction of the wheel bearing to cover the sealing section.

The dust cover may be formed in a ring shape and inserted into the hub housing.

In the dust cover, a support portion is formed in an inner radius section; A cover portion may be formed in the outer radius section to cover the seal assembled in the sealing section at regular intervals.

An anti-rotation protrusion is formed on an inner circumferential surface of the insertion hole formed in the center of the support part; An anti-rotation groove is formed on an outer circumferential surface of the hub housing corresponding to the anti-rotation protrusion, so that the anti-rotation protrusion can be inserted.

The lock nut member is inserted into the hub housing and connected to the inner ring of the wheel bearing; A support portion is coupled to the opposite side of the wheel bearing based on the lock nut member; The cover portion may be formed with a step from the support portion toward the wheel bearing.

A lock bolt may pass through the dust cover and be bolted to the lock nut member.

A lock nut member is inserted and fastened to the hub housing; A support may be connected between the wheel bearing and the lock nut member.

An encoder may be installed in the cover part.

In the encoder, a magnetic section and a non-magnetic section may be alternately disposed along the circumferential direction of the cover part.

The present invention may include a dust cover in which the wheel bearing is inserted into the outer circumferential surface of the hub housing and provided in a shape to cover a sealing section formed between the inner ring and the outer ring of the wheel bearing.

According to the present invention through the above-mentioned problem solving means, the dust cover is provided in a shape covering the seal on one surface of the wheel bearing, thereby preventing foreign substances from entering the wheel bearing through the seal.

Therefore, when seal design modification is required to improve drag torque according to the increase in size of the wheel bearing, the degree of freedom in design of the seal is increased, thereby reducing the drag torque of the bearing and simultaneously satisfying sealing performance.

1 is a view showing the configuration of a first embodiment in which a wheel bearing and a dust cover are assembled to a hub housing according to the present invention.
Figure 2 is an enlarged view of part A of Figure 1;
Fig. 3 is a perspective view of the dust cover shown in Fig. 1;
4 is a cross-sectional view taken along line B-B of FIG. 3;
5 is an enlarged view of a configuration of a second embodiment in which a wheel bearing and a dust cover are assembled to a hub housing according to the present invention;
Fig. 6 is a perspective view of the dust cover shown in Fig. 5;
Figure 7 is a cross-sectional view along line C - C shown in Figure 6;
8 is a diagram showing a magnetic section and a non-magnetic section of a magnetic encoder according to the present invention.

A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Specific structural or functional descriptions of the embodiments of the present invention disclosed in this specification or application are merely illustrated for the purpose of explaining the embodiments according to the present invention, and the embodiments according to the present invention may be implemented in various forms. It may be and should not be construed as being limited to the embodiments described in this specification or application.

Embodiments according to the present invention can apply various changes and can have various forms, so specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosures, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The above terms are only for the purpose of distinguishing one component from another component, e.g., without departing from the scope of rights according to the concept of the present invention, a first component may be termed a second component, and similarly The second component may also be referred to as the first component.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle. Other expressions describing the relationship between elements, such as "between" and "directly between" or "adjacent to" and "directly adjacent to", etc., should be interpreted similarly.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "comprise" or "having" are intended to designate that the described feature, number, step, operation, component, part, or combination thereof exists, but one or more other features or numbers However, it should be understood that it does not preclude the presence or addition of steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this specification, they are not interpreted in an ideal or excessively formal meaning. .

Meanwhile, the present invention may be applicable to an integrated drive axle device in which the outer race of the drive shaft and the hub of the wheel bearing 20 are integrated.

Looking briefly at the integrated drive axle device, an outer race portion 12 to which a drive shaft is coupled is formed at one end of the hub housing 10, and a flange portion to which a wheel disk is coupled to the other end of the hub housing 10 ( 14) is formed, resulting in a structure in which the outer race portion 12 and the flange portion 14 are integrally formed.

In the outer race part 12, a plurality of balls and cages are inserted and coupled together with the inner race coupled to the end of the drive shaft.

In addition, a wheel guide 16 serving to guide the wheel when assembling the disk and the wheel is provided in the flange portion 14 . The wheel guide 16 may be manufactured separately and inserted, or formed integrally with the flange portion 14 .

Meanwhile, FIG. 1 is a view showing the configuration of the first embodiment in which the wheel bearing 20 and the dust cover 30 are assembled to the hub housing 10 according to the present invention, and FIG. 2 is an enlarged view of part A of FIG. 1 .

Referring to the drawings, the present invention includes a wheel bearing 20 inserted into the outer circumferential surface of the hub housing 10; The configuration includes a dust cover 30 provided in a shape to cover a sealing section formed between the inner ring 22 and the outer ring 24 of the wheel bearing 20.

Specifically, the wheel bearing 20 is inserted and installed at the middle of the outer circumferential surface of the hub housing 10 .

The wheel bearing 20 is configured to include an inner ring 22, an outer ring 24, and a ball 26, and the outer diameter of the outer circumferential surface of the hub housing 10 extends toward the flange portion 14. A stepped portion is formed in a shape to be, and one side of the inner ring 22 is supported on the stepped portion.

Then, the outer race 24 is mounted on the vehicle body, and the ball 26 is inserted between the inner race 22 and the outer race 24 to permit rotation of the inner race 22 .

In addition, a seal 28 is installed in the sealing section between the inner ring 22 and the outer ring 24 formed on both sides of the ball 26 to seal the bearing.

Also, a dust cover 30 is provided on one surface of the wheel bearing 20 to cover the seal 28 . Although the dust cover 30 is shown as covering only one side of the wheel bearing 20 to which the drive shaft is coupled among both sides of the wheel bearing 20, in some cases it is configured to cover both sides of the wheel bearing 20 You may.

That is, the dust cover 30 is provided in a shape to cover the seal 28 on one surface of the wheel bearing 20, thereby blocking foreign substances from entering the inside of the wheel bearing 20 through the seal 28. . Therefore, when design modification of the seal 28 is required to improve the drag torque according to the increase in the size of the wheel bearing 20, the design freedom of the seal 28 is increased, thereby reducing the drag torque of the bearing and improving sealing performance. can be satisfied at the same time.

In addition, FIG. 3 is a perspective view of the dust cover 30 shown in FIG. 1 .

Referring to the drawings, in the present invention, the dust cover 30 is provided along the circumferential direction of the wheel bearing 20 to cover the sealing section.

To this end, the dust cover 30 is formed in a ring shape and has a structure inserted into the hub housing 10 .

For reference, the dust cover 30 can be made of a material that is durable to external impact and environment, and an example of this can be SUS.

That is, a circular insertion hole 32 is formed in the center of the dust cover 30, and the insertion hole 32 is inserted into the outer circumferential surface of the outer race part 12 of the hub housing 10. Therefore, since the circumferential surface of the dust cover 30 is covered in a shape that entirely blocks the front surface of the seal 28, it is possible to more reliably block foreign substances from entering the seal 28.

Subsequently, FIG. 4 is a cross-sectional view taken along line B - B of FIG. 3 .

Therefore, looking at the configuration of the dust cover 30 in more detail with reference to FIGS. 2 to 4, the dust cover 30 largely includes a support part 34 and a cover part 36. As such, while being inserted into the hub housing 10, the support portion 34 is formed in the inner radial section corresponding to the inner ring 22; A cover part 36 is formed in the outer radius section following the support part 34 and is provided to cover the sealing section at regular intervals.

That is, a support portion 34 is formed in a predetermined inner radius section connected to the inner circumferential surface of the dust cover 30, and the support portion 34 participates in supporting the inner ring 22.

In addition, a cover part 36 is formed in a predetermined outer radius section between the outer circumferential surface of the dust cover 30 and the support part 34, so that one surface of the cover part 36 covers the seal 28. are provided At this time, the cover part 36 is spaced apart from the outer ring 24 as well as the seal 28 to prevent interference, so that the drag torque of the bearing does not increase.

In addition, an anti-rotation protrusion 35 is formed on the inner circumferential surface of the insertion hole 32 formed in the center of the support part 34; An anti-rotation groove 15 is formed on the outer circumferential surface of the hub housing 10 corresponding to the anti-rotation protrusion 35 so that the anti-rotation protrusion 35 is inserted.

For example, at least one anti-rotation protrusion 35 may be formed on the inner circumferential surface of the insertion hole 32, and the anti-rotation groove 15 may be formed in a position and shape corresponding to the anti-rotation protrusion 35. there is.

In addition, the anti-rotation protrusion 35 is formed in a key shape protruding in the inner radial direction toward the hub housing 10, and the anti-rotation groove 15 is a key groove along the axial direction on the outer circumferential surface of the hub housing 10. formed into a shape

Accordingly, as the anti-rotation protrusion 35 is assembled to the anti-rotation groove 15 along the axial direction, the relative rotation of the dust cover 30 with respect to the hub housing 10 is limited, and the lock nut member (to be described later) 40) to prevent loosening.

Meanwhile, the dust cover 30 applied to the present invention may be implemented with the structure of the first embodiment of FIGS. 1 and 2 and the structure of the second embodiment of FIG. 5 .

Accordingly, referring to FIGS. 1 and 2, looking in detail at the structure of the first embodiment of the dust cover 30, the lock nut member 40 is inserted into and fastened to the hub housing 10 so that the wheel bearing 20 It is connected to the inner ring 22 of; The support part 34 is coupled to the opposite side of the wheel bearing 20 based on the lock nut member 40; The cover part 36 may be formed with a step from the support part 34 toward the wheel bearing 20 .

For example, in order to adjust and maintain the preload of the wheel bearing 20, the lock nut member 40 is coupled to the outer circumferential surface of the hub housing 10 in a screw thread structure, and one surface of the lock nut member 40 is supported by the inner ring 22 do.

In addition, as the dust cover 30 is inserted into the hub housing 10, the support portion 34 is brought into contact with the other surface of the lock nut member 40, and the portion extending from the support portion 34 to the cover portion 36 is sealed. It is formed stepwise toward (28) so that the cover part (36) covers the front surface of the seal (28).

Therefore, it is possible to prevent the lock nut member 40 from loosening through the dust cover 30 and to prevent foreign substances from entering the wheel bearing 20 .

In addition, the lock bolt 50 may pass through the dust cover 30 and be bolted to the lock nut member 40 .

For example, the lock nut member of the dust cover 30 ( 40) can be firmly attached to it.

Continuing, with reference to FIGS. 5 and 6, examining the structure of the second embodiment of the dust cover 30 in detail, the lock nut member 40 is inserted into and fastened to the hub housing 10; The support portion 34 is connected between the wheel bearing 20 and the lock nut member 40 to form a configuration.

For example, in order to adjust and maintain the preload of the wheel bearing 20, the lock nut member 40 is coupled to the outer circumferential surface of the hub housing 10 in a screw thread structure, and the dust between the lock nut member 40 and the wheel bearing 20 As the cover 30 is coupled, one surface of the support portion 34 of the dust cover 30 is supported by the inner ring 22, and the other surface of the support portion 34 is supported by the lock nut member 40.

Of course, the dust cover 30 is also inserted into and coupled to the outer circumferential surface of the hub housing 10 as in the first embodiment, and the cover part 36 extending from the support part 34 covers the front surface of the seal 28 becomes a form Thus, it is possible to prevent foreign substances from entering the wheel bearing 20 .

However, unlike the dust cover 30 of the first embodiment, the support part 34 and the cover part 36 are formed on the same plane.

Meanwhile, referring to FIGS. 3 and 4 , an encoder 38 may be installed in the cover part 36 .

In particular, FIG. 8 is a view showing a magnetic section 38a and a non-magnetic section 38b of the magnetic encoder 38 according to the present invention. The encoder 38 has a magnetic section along the circumferential direction of the cover part 36. 38a and the non-magnetic section 38b are arranged alternately.

In other words, the encoder 38 according to the present invention is a magnetic encoder 38 for measuring the rotation speed of a bearing, and includes a magnetic section 38a arranged at a predetermined angle along the circumferential direction of the cover part 36 and A magnetic material and a non-magnetic material may be provided in the non-magnetic section 38b. The encoder 38 may be applied to the dust cover 30 through a method such as injection or bonding.

For reference, although not shown in the figure, it can be used to detect the rotation of the bearing by facing the magnetic sensor to the encoder 38, thereby securing the rotational displacement and rotational speed of the bearing. That is, when the encoder 38 is rotated, the magnetic pole of the magnetized magnetic material is detected in the form of a pulse through the magnetic sensor, and based on this, the rotational speed of the bearing can be precisely detected.

As described above, in the present invention, the dust cover 30 is provided in a shape covering the seal 28 on one surface of the wheel bearing 20, so that foreign substances are introduced into the wheel bearing 20 through the seal 28 to block things Therefore, when design modification of the seal 28 is required to improve the drag torque according to the increase in the size of the wheel bearing 20, the design freedom of the seal 28 is increased, thereby reducing the drag torque of the bearing and improving sealing performance. can be satisfied at the same time.

On the other hand, although the present invention has been described in detail only for the specific examples described above, it is obvious to those skilled in the art that various changes and modifications are possible within the scope of the technical idea of the present invention, and it is natural that these changes and modifications fall within the scope of the appended claims. .

10: hub housing
12: outer race part
14: flange part
15: anti-rotation groove
16: wheel guide
20: wheel bearing
22: inner ring
24: outer ring
26 : ball
28: seal
30: dust cover
32: insertion hole
34: support
35: anti-rotation protrusion
36: cover part
38: encoder
38a: magnetic section
38b: non-magnetic section
40: lock nut member
50: lock bolt

Claims (11)

Wheel bearings inserted into the outer circumferential surface of the hub housing;
Including; a dust cover provided in a shape to cover a sealing section formed between the inner ring and the outer ring of the wheel bearing,
The dust cover,
While being inserted into the hub housing, a support is formed in the inner radial section;
A cover part is formed in the outer radius section connected to the support part to cover the seal in the sealing section;
An anti-rotation protrusion is formed on an inner circumferential surface of the insertion hole formed in the center of the support part;
An anti-rotation groove is formed along an axial direction of the outer circumferential surface of the hub housing, into which an anti-rotation protrusion is inserted;
The lock nut member is inserted into the hub housing and connected to the inner ring of the wheel bearing;
A support portion is coupled to the opposite side of the wheel bearing based on the lock nut member;
A wheel bearing assembly, characterized in that the lock bolt penetrates the support of the dust cover and is bolted to the lock nut member. The method of claim 1,
The wheel bearing assembly, characterized in that the dust cover is provided along the circumferential direction of the wheel bearing to cover the sealing section. The method of claim 1,
The wheel bearing assembly, characterized in that the dust cover is formed in a ring shape and inserted into the hub housing. delete delete The method of claim 1,
The wheel bearing assembly, characterized in that the cover portion is formed with a step from the support portion toward the wheel bearing. delete Wheel bearings inserted into the outer circumferential surface of the hub housing;
Including; a dust cover provided in a shape to cover a sealing section formed between the inner ring and the outer ring of the wheel bearing,
The dust cover,
While being inserted into the hub housing, a support part is formed in the inner radial section, and one side of the support part is supported on the inner ring;
A cover part is formed in the outer radius section connected to the support part to cover the seal in the sealing section;
An anti-rotation protrusion is formed on an inner circumferential surface of the insertion hole formed in the center of the support part;
An anti-rotation groove is formed along an axial direction of the outer circumferential surface of the hub housing, into which an anti-rotation protrusion is inserted;
A wheel bearing assembly, characterized in that the lock nut member is inserted and fastened to the hub housing, and the lock nut member is supported on the other surface of the support portion, so that the support portion is connected between the inner ring of the wheel bearing and the lock nut member. The method of claim 1,
Wheel bearing assembly, characterized in that the encoder is installed in the cover portion. The method of claim 9,
The encoder is a wheel bearing assembly, characterized in that the magnetic section and the non-magnetic section are alternately arranged along the circumferential direction of the cover portion. A wheel bearing is inserted into the outer circumferential surface of the hub housing, and a dust cover is provided in a shape to cover a sealing section formed between an inner ring and an outer ring of the wheel bearing,
The dust cover,
While being inserted into the hub housing, a support is formed in the inner radial section;
A cover part is formed in the outer radius section connected to the support part to cover the seal in the sealing section;
An anti-rotation protrusion is formed on an inner circumferential surface of the insertion hole formed in the center of the support part;
An anti-rotation groove is formed along an axial direction of the outer circumferential surface of the hub housing, into which an anti-rotation protrusion is inserted;
The lock nut member is inserted into the hub housing and connected to the inner ring of the wheel bearing;
A support portion is coupled to the opposite side of the wheel bearing based on the lock nut member;
A mechanism for preventing foreign substances from entering the wheel bearing, characterized in that the lock bolt is penetrated through the dust cover and coupled to the lock nut member by bolting.

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