KR102595375B1 - Drive axle assembly - Google Patents

Abstract

The present invention relates to a drive axle assembly that improves the price competitiveness of the product by improving the fastening structure of the boot and increases the design freedom of the wheel sensor. In the present invention, a wheel bearing is assembled on the outer circumferential surface, and a cylindrical vertical forming part is formed at the end to the outside. A wheel housing formed in a rolled shape to press the inner ring of the wheel bearing; A bearing seal provided between the outer ring and the inner ring of the wheel bearing; An encoder is integrally formed at one end and sealed by a bearing seal between the outer ring and the inner ring, the middle part is tightly fixed in a shape that covers the inner ring and the cylindrical vertical forming part, and the other end is a boot fastening ring to which the large diameter part of the boot is coupled. A drive axle assembly is introduced.

Description

Drive axle assembly {Drive axle assembly}

The present invention relates to a drive axle assembly that increases the price competitiveness of the product by improving the fastening structure of the boot and increases the design freedom of the wheel sensor.

The Integrated Drive Axle (IDA) is a structure that integrates the outer race and hub of the constant velocity joint.

In this type of drive axle, a wheel bearing is inserted into the wheel housing, a lock nut and a retaining ring are combined in a nut type to apply a preload to the inner ring of the wheel bearing, and these are connected by bolts.

In addition, a bearing seal is combined between the outer and inner rings of the wheel bearing to prevent the inflow of foreign substances. In particular, an encoder is combined with the bearing seal to create an encoder seal, and the encoder seal and wheel sensor are used to seal the wheel. Speed is measured.

However, since the parts for applying preload to the inner ring and the parts for sealing the wheel bearing are installed separately, not only the number of parts increases, but also the size of the wheel housing increases, resulting in an increase in manufacturing cost.

In addition, as the lock nut is formed to a certain thickness in the outer radial direction, the wheel sensor is installed avoiding the lock nut, so the installation location of the wheel sensor is moved away in the outer radial direction by the thickness of the lock nut, and thus the wheel sensor and As the gap between peripheral parts becomes narrow, there is a disadvantage in configuring the wheel sensor package.

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

KR 10-2064275 B1 KR 10-2010-0064081 A

The present invention was devised to solve the problems described above, and aims to provide a drive axle assembly that secures the price competitiveness of the product while stably performing the sealing function inside the wheel bearing by improving the fastening structure of the boot. .

The purpose of the present invention is to provide a drive axle assembly that improves the design freedom of a wheel sensor.

The configuration of the present invention for achieving the above object includes a wheel housing in which a wheel bearing is assembled on the outer peripheral surface, and a cylindrical vertical molding portion at the end is formed in an outwardly rolled shape to press the inner ring of the wheel bearing; A bearing seal provided between the outer ring and the inner ring of the wheel bearing; An encoder is integrally formed at one end and sealed by a bearing seal between the outer ring and the inner ring, the middle part is tightly fixed in a shape that covers the inner ring and the cylindrical vertical forming part, and the other end is a boot fastening ring to which the large diameter part of the boot is coupled. It can be characterized as:

The surface where the cylindrical vertical forming part and the boot fastening ring are in close contact may be fixed in close contact with a sealant.

An O-ring may be fastened between the cylindrical vertical forming part and the surface with which the boot fastening ring is in close contact.

A close contact portion is formed in the radial direction in the middle portion of the boot fastening ring and is tightly fixed to the outer surface of the boot side of the cylindrical vertical forming portion; A support part is formed on the edge of the close contact part in a shape bent toward the inner ring to surround the edge of the cylindrical vertical forming part; The inner ring support portion is formed in a shape that is bent in the outer radial direction at the end of the support portion, so that it can be in close contact with the outer surface of the boot side of the inner ring.

A horizontal sealing part provided between the inner ring and the bearing seal, fixed to the inner ring, and contacting the seal lip of the bearing seal; It may include a vertical sealing portion to which the encoder is fixed and which is provided in a shape to block the outside of the bearing seal and contacts other seal lips of the bearing seal.

The horizontal sealing portion is formed in an overlapping shape by being sequentially folded from the end of the inner ring support portion to the inside and outside of the wheel bearing; The vertical sealing portion may be bent in an outer radial direction at an outer end of the horizontal sealing portion.

The vertical sealing portion is formed in an overlapping shape by being sequentially folded in the outer radial direction and the inner radial direction at the end of the inner ring support portion; The horizontal sealing part may be bent inward of the wheel bearing at the inner end of the vertical sealing part.

An outer ring fixture having an 'L' shaped cross section is fixed to the outer ring; A bearing seal is fixed to the outer ring fixture; A first seal lip is formed to protrude from the bearing seal toward the vertical sealing portion and contacts the vertical sealing portion; A second seal lip may be formed to protrude from the bearing seal toward the horizontal sealing portion and may contact the horizontal sealing portion.

It may include a vertical sealing portion to which the encoder is fixed, and which is provided in a shape to block the outside of the bearing seal at the end of the inner ring support portion and is in contact with another seal lip of the bearing seal.

An outer ring fixture having an 'L' shaped cross section is fixed to the outer ring; A bearing seal is fixed to the outer ring fixture; A first seal lip is formed to protrude from the bearing seal toward the vertical sealing portion and contacts the vertical sealing portion; A second seal lip may be formed to protrude from the bearing seal toward the inner ring and be in contact with the inner ring.

The inner ring support portion may be coupled to the inner ring by a fixing pin.

A boot assembly groove is formed along the outer peripheral surface of the other end of the boot fastening ring; The large diameter portion of the boot is fitted into the boot assembly groove; A band is fastened to the large diameter portion of the boot so that the boot can be assembled to the boot fastening ring.

The length ratio of the inner diameter of the assembly portion formed at the other end of the boot fastening ring to the outer diameter of the cylindrical vertical forming portion may be equal to inequality (1) below.

0.62 ≤ d1/D2 ≤ 0.85......................(1)

d1: inner diameter of assembly part

D2: Outside diameter of cylindrical vertical forming part

The ratio of the length of the outer diameter of the support portion formed at one end of the boot fastening ring to the thickness of the cylindrical vertical forming portion may be equal to inequality (2) below.

15 ≤ d2/t ≤ 33.......................(2)

d2: Outer diameter of support

t: Thickness of cylindrical vertical forming part

The length ratio of the outer diameter of the inner ring to the axial length of the boot fastening ring assembled between the outer and inner rings of the wheel bearing may be equal to inequality (3) below.

17 ≤ D3/B ≤ 33.......................(3)

D3: Outer diameter of inner ring

B: Axial length of the boot fastening ring assembled between the outer ring and the inner ring

The ratio of the length from the inner surface of the close contact part of the boot fastening ring to the end of the assembly part to the diameter of the circle connecting the groove center of the wheel housing may be equal to inequality (4) below.

0.15 ≤ L/D1 ≤ 0.35......................(4)

L: Length from the inner surface of the tight part of the boot fastening ring to the end of the assembly part

D1: Diameter of the circle connecting the groove center of the wheel housing

Through the means of solving the above problems, the present invention is a component that pressurizes the inner ring while stably performing the sealing function inside the wheel bearing by fixing the boot to the wheel housing by a boot fastening ring and implementing an integrated encoder seal structure. It has the advantage of significantly reducing the number of parts by integrating the parts that implement the and encoder seals, as well as securing the price competitiveness of the product by reducing the size of the wheel housing.

Moreover, as preload devices such as fixing nuts/retaining rings that secure the inner ring of the wheel bearing are eliminated, the radial distance between the wheel sensor and the wheel housing is reduced, and the gap between the wheel sensor and surrounding parts becomes relatively relaxed, allowing the wheel There is also the advantage of increasing the degree of freedom in sensor design.

1 is a view showing a first embodiment of a boot fastening ring according to the present invention.
Figure 2 is an enlarged view of part 'A' of Figure 1.
Figure 3 is a diagram showing a second embodiment of the boot fastening ring according to the present invention.
Figure 4 is a diagram showing a third embodiment of a boot fastening ring according to the present invention.
Figure 5 is a diagram showing a structure in which the boot fastening ring according to the present invention is coupled by a fixing pin.
Figure 6 is a diagram for explaining the numerical relationship of main parts of the drive axle according to the present invention.

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

Since the embodiments according to the present invention can make various changes and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiments according to the concept of the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

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

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between. Other expressions that describe the relationship between components, such as "between" and "immediately between" or "neighboring" and "directly adjacent to" should be interpreted similarly.

The terms used herein are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate the existence of a described feature, number, step, operation, component, part, or combination thereof, but are not intended to indicate the presence of one or more other features or numbers. It should be understood that this does not preclude the existence or addition of steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in this specification, should not be interpreted as having an ideal or excessively formal meaning. .

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

1 is a diagram showing an integrated drive axle (IDA) applied to the present invention, in which the outer ring 210 of the wheel bearing 200 is fixed to the knuckle or carrier, and the outer ring of the wheel bearing 200 The wheel bearing 200 is inserted into the outer peripheral surface of the wheel housing 100, in which a ball (or roller) and a cage are assembled and integrated between the 210 and the inner ring 220.

Then, a cylindrical vertical forming process is performed on the end of the wheel housing 100 to form a cylindrical vertical forming part 110 that rolls the end of the wheel housing 100 outward, thereby forming the inner ring of the wheel bearing 200. A preload is applied to 220, and thus the wheel bearing 200 is fixed to the wheel housing 100.

In addition, the drive shaft 600 is connected to the inside of the wheel housing 100 through a constant velocity joint, so that the driving force of the powertrain is transmitted to the constant velocity joint through the drive shaft 600, and the constant velocity joint is connected according to the behavior of the vehicle. The wheel housing 100 rotates as it flows and is cut.

Meanwhile, Figure 1 is a diagram showing a first embodiment of the boot 400 fastening structure according to the present invention.

Referring to the drawing, the wheel bearing 200 is assembled on the outer peripheral surface, and the cylindrical vertical forming part 110 at the end is formed in a shape rolled outward to press the inner ring 220 of the wheel bearing 200. 100); A bearing seal 230 provided between the outer ring 210 and the inner ring 220 of the wheel bearing 200; The encoder 360 is integrally formed at one end and sealed between the outer ring 210 and the inner ring 220 by a bearing seal 230, and the middle part covers the inner ring 220 and the cylindrical vertical forming part 110. It is tightly fixed and consists of a boot fastening ring 300 to which the large diameter portion 410 of the boot 400 is coupled to the other end.

For example, the diameter of the boot fastening ring 300 on the wheel housing 100 side is formed to be larger than the diameter of the middle portion of the boot fastening ring 300.

Accordingly, the middle portion of the boot fastening ring 300 is closely fixed to the cylindrical vertical forming part 110 and the inner ring 220, and in particular, the encoder 360 formed integrally with the outer ring 210 of the boot fastening ring 300 is attached to the outer ring 210. and is inserted between the inner ring 220 to face the bearing seal 230, thereby implementing an encoder seal structure in which the bearing seal 230 and the encoder 360 are integrated.

That is, by fixing the boot 400 to the wheel housing 100 by the boot fastening ring 300 and implementing an integrated encoder seal structure, the parts that pressurize the inner ring 220 and the parts that implement the encoder seal are Integration not only significantly reduces the number of parts, but also reduces the size of the wheel housing 100, thereby ensuring price competitiveness of the product.

In addition, as preload devices such as fixing nuts/fixing rings that secure the inner ring 220 of the wheel bearing 200 are deleted, the radial distance between the wheel sensor (S) and the wheel housing 100 is reduced, thereby reducing the wheel sensor ( The gap between S) and surrounding parts becomes relatively relaxed, increasing the degree of design freedom of the wheel sensor (S).

In addition, in the present invention, the surface where the cylindrical vertical forming part 110 and the boot fastening ring 300 are in close contact can be fixed in close contact with a sealant.

For example, the cylindrical vertical forming part 110 and the boot are fastened by applying a sealant between one side of the cylindrical vertical forming part 110 facing the boot 400 and one surface of the boot fastening ring 300 facing the wheel housing 100. The space between the rings 300 is sealed.

Accordingly, the coupling force between the wheel housing 100 and the boot fastening ring 300 is improved to prevent grease inside the wheel housing 100 from leaking, thereby preventing quality problems from occurring.

In addition, referring to FIG. 2, an O-ring (O) may be fastened between the surface where the cylindrical vertical forming part 110 and the boot fastening ring 300 are in close contact.

For this purpose, a ring groove 312 is formed along the circumferential direction on one surface of the boot fastening ring 300 facing the wheel housing 100, and an O-ring (O) is coupled to the ring groove 312.

Accordingly, the O-ring (O) performs a sealing action on the surface in close contact between the wheel housing 100 and the boot fastening ring 300, thereby more reliably preventing the grease inside the wheel housing 100 from leaking to the outside.

For reference, the ring groove 312 may be formed in the cylindrical vertical forming part 110 instead of the boot fastening ring 300 to engage the O-ring (O).

Meanwhile, referring to FIGS. 2 to 4, in the present invention, a close contact portion 310 is formed in the radial direction in the middle portion of the boot fastening ring 300 to form an outer surface of the boot 400 side of the cylindrical vertical forming portion 110. is tightly fixed to; A support portion 320 is formed on the edge of the close contact portion 310 in a shape bent toward the inner ring 220 and surrounds the edge of the cylindrical vertical forming portion 110; The inner ring support portion 330 is formed in a shape bent in the outer radial direction at the end of the support portion 320 and may be in close contact with the outer surface of the inner ring 220 on the boot 400 side.

For example, a close contact portion 310 is formed in the middle portion of the boot fastening ring 300 in a shape facing the cylindrical vertical forming portion 110, so that the close contact portion 310 is on one side of the cylindrical vertical forming portion 110. It overlaps and becomes fixed.

In addition, a support part 320 is formed on the outer edge of the close contact part 310, and the inner surface of the support part 320 is provided in a shape to surround the edge of the cylindrical vertical forming part 110.

In addition, at the end of the support portion 320, the inner ring support portion 330 is formed in a shape that extends in the outer radial direction and is closely fixed to the inner ring 220.

That is, the close contact portion 310 is tightly fixed to the outer surface of the cylindrical vertical forming part 110 on the boot 400 side, and the inner ring support portion 330 is fixed in close contact with one surface of the inner ring 220. Accordingly, the coupling force between the boot fastening ring 300, the inner ring 220 and the wheel housing 100 in close contact with the boot ring 300 is improved to prevent the grease inside the wheel housing 100 from leaking.

Meanwhile, Figure 2 is an enlarged view showing the first embodiment of the boot fastening ring 300 according to the present invention, and Figure 3 is a diagram showing the second embodiment of the boot fastening ring 300 according to the present invention. In the drawings, in the case of the first and second embodiments, one end of the boot fastening ring 300 is largely divided into a horizontal sealing part 340 and a vertical sealing part 350, and each sealing part has a bearing seal. The seal lips at (230) come into contact and a sealing action is performed.

For example, a horizontal sealing portion 340 provided between the inner ring 220 and the bearing seal 230 and fixed to the inner ring 220 and contacting the seal lip of the bearing seal 230; The encoder 360 is fixed, and a vertical sealing portion 350 is provided in a shape to block the outside of the bearing seal 230 and contacts other seal lips of the bearing seal 230.

That is, the inner peripheral surface of the horizontal sealing part 340 is fixed to the inner ring 220, and the seal lip of the bearing seal 230 is in contact with the outer peripheral surface of the horizontal sealing part 340.

Then, the encoder 360 is integrally formed on the outer surface of the vertical sealing part 350, and another seal lip of the bearing seal 230 is in contact with the inner surface of the vertical sealing part 350.

Looking at the configuration of the first embodiment of the boot fastening ring 300 in detail through FIG. 2, the horizontal sealing portion 340 is sequentially located from the end of the inner ring support portion 330 to the inside and outside of the wheel bearing 200. It is formed into a shape that overlaps as it is folded; The vertical sealing part 350 may be bent in the outer radial direction at the outer end of the horizontal sealing part 340.

That is, the end of the outer edge of the inner ring support portion 330 is bent toward the inside of the wheel bearing 200, and then folded back toward the outside of the wheel bearing 200 to form a horizontal sealing portion 340, and the wheel bearing 200 is bent toward the inside of the wheel bearing 200. The outwardly folded end of (200) is bent in the outer radial direction to form a vertical sealing portion (350).

In addition, looking in detail at the configuration of the second embodiment of the boot fastening ring 300 through FIG. 3, the vertical sealing portion 350 is sequentially formed in the outer radial direction and the inner radial direction from the end of the inner ring support portion 330. It is formed into a shape that overlaps as it is folded; The horizontal sealing part 340 may be formed by bending the inner end of the vertical sealing part 350 toward the inside of the wheel bearing 200.

That is, it is formed to be bent toward the outer radial direction at the end of the outer edge of the inner ring support portion 330, and then folded again toward the inner radial direction from the inside of the wheel bearing 200 to form a vertical sealing portion 350, and the wheel bearing ( The end folded toward the inner radial direction of the wheel bearing 200 is bent toward the inside of the wheel bearing 200 to form a horizontal sealing portion 340.

In the case of the first and second embodiment structures of the boot fastening ring 300, an outer ring fixture 240 having an 'L' shaped cross section is fixed to the outer ring 210; A bearing seal 230 is fixed to the outer ring fixture 240; A first seal lip 232 is formed to protrude from the bearing seal 230 toward the vertical sealing part 350 and contacts the vertical sealing part 350; A second seal lip 234 is formed to protrude from the bearing seal 230 toward the horizontal sealing part 340 and is in contact with the horizontal sealing part 340.

For example, the outer circumferential edge of one end of the outer ring fixture 240 is fixed to the inner surface of the outer ring 210, and the other end of the outer ring fixture 240 is bent toward the inner ring 220 at the middle portion.

And, the bearing seal 230 is fixed in a shape that surrounds the outer surface of the outer ring fixture 240.

In addition, at least two seal lips, including a first seal lip 232 and a second seal lip 234, are formed to protrude from the bearing seal 230 toward the vertical sealing part 350 and the horizontal sealing part 340, The protruding seal lip contacts the vertical sealing part 350 and the horizontal sealing part 340, respectively, to perform a sealing action.

In addition, the encoder 360 formed integrally with the vertical sealing part 350 is inserted between the inner ring 220 and the outer ring 210 equipped with a bearing seal 230, thereby implementing an integrated encoder seal structure.

Meanwhile, Figure 4 is a diagram showing a third embodiment of the boot fastening ring 300 according to the present invention.

Referring to the drawing, the encoder 360 is fixed, and the end of the inner ring support 330 is provided in a shape to block the outside of the bearing seal 230, so that the other seal lip of the bearing seal 230 is in contact with the vertical sealing ring. It is composed of a unit 350;

That is, as the seal lip of the bearing seal 230 contacts the inner ring 220, the encoder 360 is formed integrally with the outer surface of the vertical sealing part 350, and the bearing is attached to the inner surface of the vertical sealing part 350. Another seal lip of the seal 230 is contacted.

And, in the case of the third embodiment structure of the boot fastening ring 300, an outer ring fixture 240 having an 'L' shaped cross section is fixed to the outer ring 210; A bearing seal 230 is fixed to the outer ring fixture 240; A first seal lip 232 is formed to protrude from the bearing seal 230 toward the vertical sealing part 350 and contacts the vertical sealing part 350; A second seal lip 234 may be formed to protrude from the bearing seal 230 toward the inner ring 220 and come into contact with the inner ring 220 .

For example, the outer circumferential edge of one end of the outer ring fixture 240 is fixed to the inner surface of the outer ring 210, and the other end of the outer ring fixture 240 is bent toward the inner ring 220 at the middle portion.

And, the bearing seal 230 is fixed in a shape that surrounds the outer surface of the outer ring fixture 240.

In addition, at least two seal lips, including a first seal lip 232 and a second seal lip 234, are formed to protrude from the bearing seal 230 toward the vertical sealing part 350 and the inner ring 220, and the protruding seal lip It comes into contact with the vertical sealing part 350 and the inner ring 220, respectively, to perform a sealing action.

In addition, the encoder 360 formed integrally with the vertical sealing part 350 is inserted between the inner ring 220 and the outer ring 210 equipped with a bearing seal 230, thereby implementing an integrated encoder seal structure.

In addition, Figure 5 is a diagram showing a structure in which the boot fastening ring 300 according to the present invention is coupled by a fixing pin (P).

Referring to the drawings, the inner ring support portion 330 may be coupled to the inner ring 220 by a fixing pin (P).

For example, the fixing pin (P) penetrates the inner ring support portion 330 and is coupled to the inner ring 220.

That is, not only is the close contact portion 310 tightly fixed to the outer surface of the boot 400 side of the cylindrical vertical forming portion 110, but also the inner ring support portion 330 is in close contact with one surface of the inner ring 220 and the fixing pin ( It is fixed by P).

Accordingly, the coupling force between the boot fastening ring 300, the inner ring 220 and the wheel housing 100 in close contact with the boot ring 300 is improved to prevent the grease inside the wheel housing 100 from leaking.

Meanwhile, referring to Figure 1, a boot assembly groove 380 is formed along the outer peripheral surface of the other end of the boot fastening ring 300; The large diameter portion 410 of the boot 400 is fitted into the boot assembly groove 380; The band 500 is fastened to the large diameter portion 410 of the boot 400 so that the boot 400 can be assembled to the boot fastening ring 300.

For example, an assembly part 370 is formed at the other end of the boot fastening ring 300, and a boot assembly groove 380 is formed on the outer peripheral surface of the assembly part 370.

In addition, a boot assembly protrusion 420 corresponding to the boot assembly groove 380 is formed on the inner peripheral surface of the large diameter portion 410 of the boot 400, so that the boot assembly protrusion 420 is located within the boot assembly groove 380. It is inserted.

Accordingly, the band 500 is fastened to the outer peripheral surface of the large diameter portion 410 of the boot 400, and the boot 400 is fastened and assembled to the boot fastening ring 300.

Meanwhile, Figure 6 is a diagram for explaining the numerical relationship between main parts of the drive axle according to the present invention.

Referring to FIG. 7, the length ratio of the inner diameter of the assembly portion 370 formed at the other end of the boot fastening ring 300 to the outer diameter of the cylindrical vertical forming portion 110 may be equal to inequality (1) below.

0.62 ≤ d1/D2 ≤ 0.85......................(1)

d1: inner diameter of assembly part (370)

D2: Outer diameter of cylindrical vertical forming part (110)

According to this numerical range, the close contact area between the close contact portion 310 of the boot fastening ring 300 and the cylindrical vertical forming portion 110 is increased, thereby improving the sealing performance against grease inside the wheel housing 100. Of course, the fastening support force of the boot 400 is improved.

Continuing, as shown in FIG. 7, the length ratio of the outer diameter of the support portion 320 formed at one end of the boot fastening ring 300 to the thickness of the cylindrical vertical forming portion 110 may be equal to inequality (2) below.

15 ≤ d2/t ≤ 33.......................(2)

d2: Outer diameter of support (320)

t: Thickness of cylindrical vertical forming part (110)

According to this numerical range, the support portion 320 of the boot fastening ring 300 is tightly fixed to the inner ring 220 while surrounding the cylindrical vertical forming portion 110, thereby forming the boot fastening ring 300 and the cylindrical vertical forming portion ( 110) The fastening force between teeth is improved.

And, as shown in FIG. 7, the length ratio of the outer diameter of the inner ring 220 to the axial length of the boot fastening ring 300 assembled between the outer ring 210 and the inner ring 220 of the wheel bearing 200 is expressed in the inequality below ( 3) can be characterized as follows.

17 ≤ D3/B ≤ 33.......................(3)

D3: Outer diameter of inner ring (220)

B: Axial length of the boot fastening ring 300 assembled between the outer ring 210 and the inner ring 220

According to this numerical range, the sealing performance of the bearing seal 230 and the fastening performance of the boot fastening ring 300 are improved.

In addition, as shown in FIG. 7, the ratio of the length from the inner surface of the close contact portion 310 of the boot fastening ring 300 to the end of the assembly portion 370 to the diameter of the circle connecting the groove center of the wheel housing 100 is expressed in the inequality below. It may be the same as (4).

0.15 ≤ L/D1 ≤ 0.35......................(4)

L: Length from the inner surface of the close contact part 310 of the boot fastening ring 300 to the end of the assembly part 370

D1: Diameter of the circle connecting the groove center of the wheel housing (100)

According to this numerical range, the PCD of the bearing of the constant velocity joint on the wheel side increases, the length of the boot 400 becomes shorter, and the length of the drive shaft 600 becomes longer, which improves the incision and has an advantage in terms of layout. .

As described above, the present invention secures the boot 400 to the wheel housing 100 by the boot fastening ring 300 and implements an integrated encoder seal structure, thereby providing a sealing function inside the wheel bearing 200. By integrating the parts that pressurize the inner ring (220) and the parts that implement the encoder seal while performing stably, the number of parts is greatly reduced, as well as the size of the wheel housing (100), thereby ensuring the price competitiveness of the product. do.

In addition, as preload devices such as fixing nuts/fixing rings that secure the inner ring 220 of the wheel bearing 200 are deleted, the radial distance between the wheel sensor (S) and the wheel housing 100 is reduced, thereby reducing the wheel sensor ( The gap between S) and surrounding parts becomes relatively relaxed, increasing the degree of design freedom of the wheel sensor (S).

Meanwhile, although the present invention has been described in detail only with respect to the above-mentioned specific examples, it is clear to those skilled in the art that various changes and modifications are possible within the technical scope of the present invention, and it is natural that such changes and modifications fall within the scope of the appended patent claims. .

100: Wheel housing
110: Cylindrical vertical forming part
200: wheel bearing
210: paddle
220: inner ring
230: Bearing seal
232: 1st seal lip
234: 2nd seal lip
240: Outer ring fixture
300: Boot fastening ring
310: Close contact part
312: Ring groove
320: support part
330: Inner ring support
340: Horizontal sealing part
350: Vertical sealing part
360: Encoder
370: Assembly unit
380: Boot assembly groove
400: boot
410: Daegyeongbu
420: Boot assembly protrusion
500: Band
600: Drive shaft
S: Wheel sensor
O: O-ring
P: fixing pin

Claims (16)

A wheel housing in which a wheel bearing is assembled on the outer peripheral surface, and a cylindrical vertical molding part at the end is formed in an outwardly rolled shape to press the inner ring of the wheel bearing;
A bearing seal provided between the outer ring and the inner ring of the wheel bearing;
An encoder is integrally formed at one end and sealed by a bearing seal between the outer ring and the inner ring, the middle part is tightly fixed in a shape that covers the inner ring and the cylindrical vertical forming part, and the other end is a boot fastening ring to which the large diameter part of the boot is coupled. do,
A close contact portion is formed in the radial direction in the middle portion of the boot fastening ring and is tightly fixed to the outer surface of the boot side of the cylindrical vertical forming portion;
A support part is formed on the edge of the close contact part in a shape bent toward the inner ring to surround the edge of the cylindrical vertical forming part;
A drive axle assembly, characterized in that the inner ring support is formed in a shape bent in the outer radial direction at the end of the support portion and is in close contact with the outer surface of the boot side of the inner ring, so that the boot fastening ring is fixed to both the cylindrical vertical forming portion and the inner ring. In claim 1,
A drive axle assembly, characterized in that the surface where the cylindrical vertical forming part and the boot fastening ring are in close contact are tightly fixed with a sealant. In claim 1,
A drive axle assembly, characterized in that an O-ring is fastened between the cylindrical vertical forming part and the surface with which the boot fastening ring is in close contact. delete In claim 1,
A horizontal sealing part provided between the inner ring and the bearing seal, fixed to the inner ring, and contacting the seal lip of the bearing seal;
A drive axle assembly comprising a vertical sealing portion to which the encoder is fixed and which is provided in a shape to block the outside of the bearing seal and contacts other seal lips of the bearing seal. In claim 5,
The horizontal sealing portion is formed in an overlapping shape by being sequentially folded from the end of the inner ring support portion to the inside and outside of the wheel bearing;
A drive axle assembly, wherein the vertical sealing portion is bent in an outer radial direction at an outer end of the horizontal sealing portion. In claim 5,
The vertical sealing portion is formed in an overlapping shape by being sequentially folded in the outer radial direction and the inner radial direction at the end of the inner ring support portion;
A drive axle assembly, characterized in that the horizontal sealing part is bent inward of the wheel bearing at the inner end of the vertical sealing part. In claim 5,
An outer ring fixture having an 'L' shaped cross section is fixed to the outer ring;
A bearing seal is fixed to the outer ring fixture;
A first seal lip is formed to protrude from the bearing seal toward the vertical sealing portion and contacts the vertical sealing portion;
A drive axle assembly, characterized in that a second seal lip is formed on the bearing seal to protrude toward the horizontal sealing portion and contact the horizontal sealing portion. In claim 1,
A drive axle assembly comprising a vertical sealing portion to which the encoder is fixed and which is provided in a shape to block the outside of the bearing seal at the end of the inner ring support portion and is in contact with another seal lip of the bearing seal. In claim 9,
An outer ring fixture having an 'L' shaped cross section is fixed to the outer ring;
A bearing seal is fixed to the outer ring fixture;
A first seal lip is formed to protrude from the bearing seal toward the vertical sealing portion and contacts the vertical sealing portion;
A drive axle assembly, characterized in that a second seal lip is formed on the bearing seal to protrude toward the inner ring and contact the inner ring. In claim 1,
A drive axle assembly, characterized in that the inner ring support portion is coupled to the inner ring by a fixing pin. In claim 1,
A boot assembly groove is formed along the outer peripheral surface of the other end of the boot fastening ring;
The large diameter portion of the boot is fitted into the boot assembly groove;
A drive axle assembly, characterized in that a band is fastened to the large diameter portion of the boot and the boot is assembled to the boot fastening ring. In claim 1,
A drive axle assembly, characterized in that the length ratio of the inner diameter of the assembly part formed at the other end of the boot fastening ring to the outer diameter of the cylindrical vertical forming part is equal to inequality (1) below.
0.62 ≤ d1/D2 ≤ 0.85......................(1)
d1: inner diameter of assembly part
D2: Outside diameter of cylindrical vertical forming part In claim 1,
A drive axle assembly, characterized in that the ratio of the length of the outer diameter of the support portion formed at one end of the boot fastening ring to the thickness of the cylindrical vertical forming portion is equal to inequality (2) below.
15 ≤ d2/t ≤ 33.......................(2)
d2: Outer diameter of support
t: Thickness of cylindrical vertical forming part In claim 1,
A drive axle assembly characterized in that the length ratio of the outer diameter of the inner ring to the axial length of the boot fastening ring assembled between the outer ring and the inner ring of the wheel bearing is equal to inequality (3) below.
17 ≤ D3/B ≤ 33.......................(3)
D3: Outer diameter of inner ring
B: Axial length of the boot fastening ring assembled between the outer ring and the inner ring In claim 1,
A drive axle assembly, characterized in that the ratio of the length from the inner surface of the close contact part of the boot fastening ring to the end of the assembly part to the diameter of the circle connecting the groove center of the wheel housing is equal to the inequality (4) below.
0.15 ≤ L/D1 ≤ 0.35......................(4)
L: Length from the inner surface of the tight part of the boot fastening ring to the end of the assembly part
D1: Diameter of the circle connecting the groove center of the wheel housing

Images