KR20200032059A - Wheel hub and wheel bearing comprising same - Google Patents

Abstract

Provided is a wheel hub which is used for a wheel bearing placed between a vehicle suspension and a wheel. The wheel hub includes: an inner hub unit which is made of a steel material and is disposed toward the suspension; and an outer hub unit which is made of a lightweight alloy material and is disposed toward the wheel. The inner hub unit has an inner surface facing the outer hub unit. An inner embossed unit is formed in at least a portion of the inner surface. The outer hub unit has an outer surface facing the inner hub unit, and an outer embossed unit having the shape corresponding to the shape of the inner embossed unit is formed in at least a portion of the outer surface.

Description

Wheel hub and wheel bearing including the same {WHEEL HUB AND WHEEL BEARING COMPRISING SAME}

The present disclosure relates to a wheel hub and a wheel bearing comprising the same.

The wheel bearing assembly is a device mounted between the rotating and non-rotating elements of the vehicle body to facilitate rotation of the rotating elements. The wheel bearing assembly of the vehicle provides a function for the vehicle to move by connecting the wheel to the vehicle body so as to be rotatable. Such a wheel bearing assembly may be divided into a driving wheel wheel bearing that transmits power generated in the engine and a driven wheel wheel bearing that does not transmit driving force.

The drive wheel wheel bearing assembly includes a rotating element and a non-rotating element. The rotating element can be rotated together with the drive shaft by the torque generated by the engine and passing through the transmission. In contrast, the non-rotating element is fixed to the vehicle body, and a transmission device is interposed between the rotating element and the non-rotating element. The follower wheel bearing assembly includes a configuration similar to the drive wheel wheel bearing assembly, but, unlike the drive wheel wheel bearing assembly, the difference is that the rotating element is not connected to the drive shaft.

The wheel bearing assembly occupies a considerable weight in the driving system of a vehicle, and various studies are underway to reduce it. In addition, various attempts have been made to reduce the weight of the wheel bearing assembly, but the conventional wheel bearing assembly has not been able to achieve the weight reduction of the wheel bearing assembly while securing the tensile strength required in the design process of the automobile.

Embodiments of the present disclosure provide a wheel bearing comprising a shock hub that is lightweight with a combination of dissimilar materials.

In addition, it provides a wheel hub with enhanced bonding between dissimilar materials.

According to an embodiment of the present disclosure, a wheel hub used in a wheel bearing disposed between a suspension device and a wheel of a vehicle, the wheel hub comprising: an inner hub portion formed of a steel material and disposed toward the suspension device; And an outer hub portion formed of a lightweight alloy material and disposed toward the wheel, the inner hub portion having an inner surface facing the outer hub portion, an inner embossing portion formed on at least a portion of the inner surface, and the outer hub portion outer facing the inner hub portion An outer embossing portion having a surface and having a shape corresponding to the shape of the inner embossing portion may be formed on at least a portion of the outer surface.

According to one embodiment, the inner embossing portion includes at least one protruding portion protruding from the inner surface toward the outer hub portion, the outer embossing portion includes at least one groove having a shape corresponding to the protruding portion, and the protruding portion is provided in the groove. Can be fitted.

According to an embodiment, the inner hub portion may include a cylindrical portion and a first flange portion extending radially from the cylindrical portion, and the outer hub portion may include a second flange portion coupled to the first flange portion.

According to one embodiment, the inner embossing portion includes a first inner embossing portion and a second inner embossing portion, the outer embossing portion includes a first outer embossing portion and a second outer embossing portion, and the first inner embossing portion is a first flange portion It is formed on at least a portion of the inner surface, the first outer embossing portion has a shape corresponding to the shape of the first inner embossing portion, is formed on at least a portion of the outer surface of the second flange portion, the second outer embossing portion is the second inner embossing It may have a shape corresponding to the shape of the negative.

According to one embodiment, the inner hub portion further includes a first binding portion formed to be recessed in a direction toward the suspension device, and the outer hub portion is formed to be recessed in a direction toward the suspension device and is formed to be engaged with the first binding portion Further comprising a second binding portion, the second inner embossing portion is formed on at least a portion of the inner surface of the first binding portion, the second outer embossing portion may be formed on at least a portion of the outer surface of the second binding portion.

According to one embodiment, the inner embossing portion and the outer embossing portion may be formed at least partially along the radial direction.

According to one embodiment, the inner embossing portion and the outer embossing portion may be formed at least partially along the circumferential direction.

According to one embodiment, each of the first inner embossing portion and the second inner embossing portion is formed in a radial direction to continuously connect to each other, and each of the first outer embossing portion and the second outer embossing portion is continuous to each other. It can be formed in the radial direction.

According to one embodiment, the first embossing portion is formed in the circumferential direction, the second inner embossing portion is formed in the radial direction to end at the side of the first inner embossing portion, and the outer embossing portion is discontinuous, so that the inner embossing portion has a discontinuous shape. To have a shape, the first outer embossing portion may be formed in a circumferential direction and the second outer embossing portion may be formed in a radial direction to end at the side of the first outer embossing portion.

According to an embodiment, the thickness of the first flange portion in the rotation axis direction may be greater than or equal to the thickness of the second flange portion.

According to an embodiment, the inner embossing portion and the outer embossing portion may be formed to have shapes corresponding to each other by a cold forging method, a warm forging method, a hot forging method or a semi-melting forging method.

According to one embodiment, a film-type brazing filler metal or paste-type brazing filler metal may be interposed in at least a portion between the inner surface of the inner hub portion and the outer surface of the outer hub portion.

According to one embodiment, the brazing filler metal is a film-type brazing filler metal, the film brazing filler metal has a first surface facing the outer hub portion, and the shape of the first surface corresponds to a shape corresponding to at least a portion of the outer surface of the outer hub portion The brazing filler metal has a second surface facing the inner hub portion, and the shape of the second surface may have a shape corresponding to at least a portion of the inner surface of the inner hub portion.

According to one embodiment, the brazing filler material is a film-type brazing filler material, and the film-type brazing filler material may be formed of a single-layer structure, a two-layer structure in which each layer is made of different materials, or a three-layer structure in which each layer is made of different materials.

According to one embodiment, the brazing filler metal may have a thickness of 10 to 100 micrometers.

According to one embodiment, the inner hub portion, the outer hub portion and the brazing filler metal may be integrally formed in a forged manner.

A wheel bearing disposed between a suspension device and a wheel of a vehicle according to another embodiment of the present disclosure includes: an outer ring coupled to one side of the suspension device; A wheel hub rotatably coupled to the outer ring; And at least one rolling element interposed between the outer ring and the wheel hub, the wheel hub comprising: an inner hub portion formed of a steel material and disposed toward the suspension device; And an outer hub portion formed of a lightweight alloy material and disposed toward the wheel, the inner hub portion having an inner surface facing the outer hub portion, an inner embossing portion formed on at least a portion of the inner surface, and the outer hub portion outer facing the inner hub portion An outer embossing portion having a surface and having a shape corresponding to the shape of the inner embossing portion may be formed on at least a portion of the outer surface.

According to an embodiment, a brazing filler metal may be interposed in at least a portion between the inner surface of the inner hub portion and the outer surface of the outer hub portion.

According to one embodiment, the rolling element is a ball-shaped rolling element, and the thickness of the inner hub portion in a direction defined to extend from the center of the rolling element to the portion in contact with the wheel hub may be greater than or equal to the radius of the rolling element. have.

According to embodiments of the present disclosure, it is possible to reduce the weight of the wheel hub by applying a lightweight alloy material to the wheel hub.

According to embodiments of the present disclosure, separation of a portion made of a steel material and a portion made of a light alloy material can be prevented.

According to embodiments of the present disclosure, a portion coupled to the rolling element may be made of a steel material to provide required stiffness, and a supporting load may be provided at an appropriate position.

1 is a cross-sectional view showing a cross section of a wheel bearing according to a first embodiment of the present disclosure.
2 is a perspective view showing a wheel hub according to a first embodiment of the present disclosure.
3 is an enlarged cross-sectional view of a cross section of a wheel bearing according to the embodiment of FIG. 1.
4 is an exploded perspective view of a wheel hub according to a first embodiment of the present disclosure, and is a perspective view showing a configuration viewed from the inner hub portion and the outer hub portion viewed in different directions from FIG. 3.
FIG. 5 is an enlarged cross-sectional view of a wheel bearing corresponding to A shown in FIG. 1.
6 is an exploded perspective view of a wheel hub according to a second embodiment of the present disclosure, and is a perspective view showing an inner hub portion and an outer hub portion.
7 is an exploded perspective view of a wheel hub according to a second embodiment of the present disclosure, and is a perspective view showing a configuration as viewed from a different direction from the inner hub portion and the outer hub portion.
8 is an exploded perspective view of a wheel hub according to a third embodiment of the present disclosure, and is a perspective view showing an inner hub portion and an outer hub portion.
9 is an exploded perspective view of a wheel hub according to a third embodiment of the present disclosure, and is a perspective view showing a configuration viewed from an angle different from that of the inner hub portion and the outer hub portion.
10 is a perspective view showing a wheel hub according to a fourth embodiment of the present disclosure.
11 is an exploded perspective view showing a wheel hub according to a fourth embodiment of the present disclosure, and is a perspective view showing an inner hub portion and an outer hub portion.
12 is an exploded perspective view showing a wheel hub according to a fourth embodiment of the present disclosure, and is a perspective view showing a configuration viewed from the inner hub portion and the outer hub portion viewed in different directions from FIG. 11.
13 is an enlarged cross-sectional view of a wheel bearing corresponding to B shown in FIG. 1.
14 is an enlarged cross-sectional view of a cross section of a wheel bearing corresponding to A shown in FIG. 1, and is a cross-sectional view for explaining an embodiment using brazing filler metal.
15 is an enlarged cross-sectional view of a cross section of a wheel bearing corresponding to B shown in FIG. 1, and is a cross-sectional view for explaining an embodiment using brazing filler metal.
16 is a perspective view showing a film-type brazing filler metal used in a wheel hub according to a first embodiment of the present disclosure.
17 is a perspective view showing a shape when the film-type brazing filler material shown in FIG. 16 is integrally coupled with an inner hub portion and an outer hub portion.
18 is a cross-sectional view showing a cross-section of the film-type brazing filler metal in the wheel hub shown in FIG. 17 in the EE direction.
19 is an enlarged cross-sectional view of a wheel bearing corresponding to C shown in FIG. 1.

The embodiments of the present disclosure are exemplified for the purpose of illustrating the technical spirit of the present disclosure. The scope of rights according to the present disclosure is not limited to the embodiments presented below or to specific descriptions of these embodiments.

All technical terms and scientific terms used in the present disclosure, unless defined otherwise, have a meaning generally understood by a person skilled in the art to which this disclosure belongs. All terms used in the present disclosure are selected for the purpose of more clearly describing the present disclosure and are not selected to limit the scope of the rights according to the present disclosure.

As used in this disclosure, expressions such as “comprising”, “having”, “having,” etc., are open terms that imply the possibility of including other embodiments, unless otherwise stated in the phrase or sentence in which the expression is included. (open-ended terms).

The expressions of the singular forms described in this disclosure may include the meaning of the plural forms unless otherwise stated, and the same applies to the expressions of the singular forms described in the claims.

Expressions such as “first” and “second” used in the present disclosure are used to distinguish a plurality of components from each other, and do not limit the order or importance of the components.

In the present disclosure, when it is stated that an element is "coupled" to another element, the element may be directly coupled to the other element, or may be coupled via a new other element. It should be understood as possible.

The dimensions and values described in the present disclosure are not limited to the dimensions and values described. Unless otherwise specified, these dimensions and values can be understood to mean the stated values and equivalent ranges including them. For example, a dimension of '10 micrometers' described in this disclosure can be understood to include 'about 10 micrometers'.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the accompanying drawings, identical or corresponding elements are given the same reference numerals. In addition, in the following description of the embodiments, the same or corresponding elements may be omitted. However, although descriptions of components are omitted, it is not intended that such components are not included in any embodiment.

In the present disclosure, the radial direction may be defined to mean a direction away from the rotational axis (RA), and the circumferential direction may be defined to mean a direction surrounding the rotation axis RA around the rotation axis RA. have.

1 is a cross-sectional view showing a cross section of a wheel bearing 1 according to a first embodiment of the present disclosure. In the coordinate system illustrated in FIG. 1, the X-axis direction may indicate a direction parallel to the rotation axis RA direction of the wheel bearing 1, and the Y-axis direction may indicate a direction perpendicular to the rotation axis RA direction.

The wheel bearing 1 is disposed between the suspension device of the vehicle and the wheel to rotate the wheel with respect to the suspension device. The wheel bearing 1 may have a shape symmetrical about the rotation axis RA. In one embodiment, the wheel bearing 1 may include a wheel hub 10, a rolling element 20, an inner ring 30, and an outer ring 40. The suspension device may be disposed in the X-axis (+) direction of the wheel bearing 1, and the wheel may be disposed in the X-axis (-) direction of the wheel bearing 1. The vehicle body may be positioned in the Y-axis (+) direction of the wheel bearing 1, and the ground may be positioned in the Y-axis (-) direction of the wheel bearing 1.

In one embodiment, the wheel hub 10 may be rotatable relative to the outer ring 40, and may include an inner hub portion 100 and an outer hub portion 200. In addition, a bolt hole 12 penetrating the inner hub portion 100 and the outer hub portion 200 may be formed in the wheel hub 10. The wheel hub 10 may be composed of at least two different materials. In addition, the wheel hub 10 may be directly coupled to the wheel of the vehicle by a wheel bolt (not shown) fastened to the bolt hole 12. Under this structure, the wheel hub 10 can rotate simultaneously with the wheel when the wheel rotates.

In one embodiment, the outer ring 40 may be coupled to one side of the suspension device. The outer ring 40 can be provided as a non-rotating element, and can be configured such that the position does not move after it is coupled to one side of the suspension. The outer ring 40 can be fixed, for example, by being coupled to the knuckle arm of the suspension device.

In one embodiment, the rolling element 20 may be interposed between the outer ring 40 and the wheel hub 10. The rolling element 20 may have a shape such as, for example, a ball bearing, and may include a plurality of balls. The upper portion of the ball contacts the outer ring 40, and the lower portion of the ball contacts the inner ring 30 or the wheel hub 10 to roll. Further, the rolling element 20 may be provided in two or more rows, for example. In this case, since the two or more rolling elements 20 support the wheel hub 10 with respect to more points, the wheel hub 10 can be stably rotated with respect to the outer ring 40.

2 is a perspective view showing a wheel hub 10 according to a first embodiment of the present disclosure.

In one embodiment, the inner hub portion 100 may be formed of a steel material and disposed toward the suspension device, and the outer hub portion 200 may be formed of a lightweight alloy material and disposed toward the wheel. Here, the lightweight alloy material may be composed of an alloy including one or more of aluminum, magnesium, titanium, or a combination thereof, for example. The inner hub portion 100 is formed of a steel material, and the outer hub portion 200 is formed of a lightweight alloy material, so that the wheel hub 10 is formed of a light weight compared to a wheel hub made of only a steel material, but the wheel hub 10 ) And the strength of the point where the rolling element 20 contacts can be maintained.

According to an embodiment, the inner hub portion 100 and the outer hub portion 200 may be integrally formed by a cold forging method, a warm forging method, or a hot forging method. For example, by the hot forging method, the inner hub portion 100 is first manufactured from a steel material, and the inner hub portion 100 and the outer hub are in a mold having an inner shape corresponding to the outer shape of the outer hub portion 200. After arranging the lightweight alloy material (for example, a preform made of lightweight alloy material) for forming the part 200, the inner hub part 100 and the lightweight alloy material are hot formed in a high temperature and high pressure environment to form a wheel. The hub 10 can be manufactured.

Alternatively, the inner hub portion 100 and the outer hub portion 200 may be formed in a semi-melting forging method. The semi-melting forging method may refer to a method in which the object is compressed in the semi-melting state after being heated in the semi-melting state, rather than the method in which the object is compressed in a complete liquid or full solid state. Here, the semi-melted state of the forged object may mean a state in which a part of the forged object is melted, that is, an intermediate state between liquid and solid as the object is heated to a temperature above a certain level. Under this semi-melting method, the inner hub portion 100 and the outer hub portion 200 may be integrally formed by being compressed in a semi-melting state after being heated to a temperature above a certain level. The forging method can be advantageous in that the process is simpler and less expensive than other methods.

After the inner hub portion 100 and the outer hub portion 200 are integrally formed in a forged manner, the bolt hole 12 may be formed at a time by a hole forming device (not shown) such as a drill. That is, the bolt holes 12 of the inner hub portion 100 and the outer hub portion 200 are not formed, but may be formed through one process. According to this configuration, matching between the bolt hole of the inner hub portion 100 and the bolt hole of the outer hub portion 200 may be improved.

3 is an exploded perspective view of a wheel hub according to a first embodiment of the present disclosure, and a perspective view showing an inner hub part and an outer hub part, and FIG. 4 is an exploded perspective view of a wheel hub according to the first embodiment of the present disclosure, It is a perspective view showing the structure of the hub part and the outer hub part as viewed from different directions from FIG. 3. The inner hub portion 100 and the outer hub portion 200 are integrally formed by a forging method, and the bolt hole 12 may be formed at a time by a hole forming device (not shown) such as a drill. However, in FIGS. 3 and 4, for convenience of description, the inner hub portion 100 and the outer hub portion 200 are illustrated in an exploded perspective view.

In one embodiment, the inner hub portion 100 has an inner surface 110 facing the outer hub portion 200, and at least a portion of the inner surface 110 may be formed with an inner embossing portion 120. In addition, the outer hub portion 200 has an outer surface 210 facing the inner hub portion 100, and at least a portion of the outer surface 210 has an outer embossing having a shape corresponding to the shape of the inner embossing portion 120 A portion 220 may be formed.

The inner embossing part 120 has an inner convex surface protruding in the direction from the inner surface 110 toward the outer hub part 200, and an inner concave surface that is not protruded and is relatively concave compared to the surroundings, and the outer embossing part 220 ) Has an outer convex surface that protrudes in the direction from the outer surface 210 toward the inner hub portion 100, and an outer concave surface that is not projected and is relatively concave compared to the surroundings.

FIG. 5 is an enlarged cross-sectional view of a wheel bearing corresponding to A shown in FIG. 1.

In one embodiment, the inner embossing portion 120 has at least one protrusion 123 protruding from the inner surface 110 toward the outer hub portion 200, and the outer embossing portion 220 has a protrusion ( At least one groove 223 having a shape corresponding to 123) may be provided. The protrusion 123 is an example of the inner convex surface, and the groove 223 is an example of the outer concave surface. Under this configuration, the protruding portion 123 of the inner embossing portion 120 may be fitted into the groove 223 of the outer embossing portion 220. In another embodiment, the inner embossing portion 120 has at least one groove formed to be recessed in a direction away from the outer hub portion 200 from the inner surface 110, and at least one of the inner embossing portion 120 At least one protrusion fitted to the groove may be provided on the outer embossing portion 220. In this case, the groove provided in the inner embossing portion 120 is an example of the inner concave surface, and the protrusion provided in the outer embossing portion 220 is an example of the outer convex surface.

The inner embossing portion and the outer embossing portion including the above-described protrusions and grooves are formed on the inner hub portion 100 and the outer hub portion 200, respectively, thereby increasing the contact area between the inner surface 110 and the outer surface 210, Accordingly, the coupling force between the inner hub portion 100 and the outer hub portion 200 may be improved.

In the inner embossing part 120 and the outer embossing part 220, the inner hub part 100 and the outer hub part 200 are manufactured by a cold forging method, a warm forging method, a hot forging method or a semi-melting forging method. It may be formed to have a shape corresponding to each other. For example, in the process of manufacturing the inner hub portion 100, the inner embossing portion 120 is first formed, and the cold forging method of the lightweight alloy material for manufacturing the inner hub portion 100 and the outer hub portion 200, The outer embossing unit 220 may be formed to have a shape corresponding to the shape of the inner embossing unit 120 in the process of manufacturing the wheel hub 10 by a warm forging method, a hot forging method, or a semi-melting forging method.

Referring back to FIGS. 3 and 4, in one embodiment, the inner hub portion 100 may include a cylindrical portion 150 and a first flange portion 130. Here, the first flange portion 130 may be formed to extend in the radial direction from the cylindrical portion 150. For example, the first flange portion 130 may be formed to extend from the cylindrical portion 150 to be perpendicular to the direction of the rotation axis of the wheel hub 10.

In one embodiment, the first flange portion 130 has a first inner surface 111 facing the outer hub portion 200, and at least a portion of the first inner surface 111 has a first inner embossing portion 121 Can be formed. Here, the first inner embossing unit 121 may be included in the inner embossing unit 120.

In one embodiment, the outer hub portion 200 is a second flange portion 230 coupled to the first flange portion 130 of the inner hub portion 100, and the first flange portion 130 is not coupled to the agent 3 may include a flange portion 250. The thickness of the second flange portion 230 may be greater than the thickness of the third flange portion 250. The second flange portion 230 and the third flange portion 250 may be formed of a single material, or may be integrally formed.

The second flange portion 230 has a first outer surface 211 facing the inner hub portion 100, and at least a portion of the first outer surface 211 corresponds to the shape of the first inner embossing portion 121 A first outer embossing portion 221 having a shape may be formed. Here, the first outer embossing unit 221 may be included in the outer embossing unit 220.

6 is an exploded perspective view of the wheel hub 50 according to the second embodiment of the present disclosure, and is a perspective view showing the inner hub part and the outer hub part, and FIG. 7 is a wheel hub 50 according to the second embodiment of the present disclosure As an exploded perspective view, it is a perspective view showing the configuration of the inner hub portion and the outer hub portion viewed from different directions from FIG. 6. As described for the first embodiment, the inner hub portion 100 and the outer hub portion 200 are integrally formed by a forging method, and the bolt hole 12 is provided in a hole forming device (not shown) such as a drill. Can be formed at once. However, FIGS. 6 and 7 illustrate the inner hub portion 100 and the outer hub portion 200 in the form of exploded perspective views for convenience of description.

In one embodiment, the inner hub portion 100 may include a first binding portion 140 formed to be recessed in a direction toward the suspension device. In one embodiment, the first binding portion 140 has a second inner surface 112 facing the outer hub portion 200, and at least a portion of the second inner surface 112 has a second inner embossing portion 122 Can be formed. Here, the second inner embossing unit 122 may be included in the inner embossing unit 120.

In one embodiment, the outer hub portion 200 may be formed to be recessed in a direction toward the suspension device and may include a second binding portion 240 formed to surround the first binding portion 140. In one embodiment, the second binding portion 240 has a second outer surface 212 facing the inner hub portion 100, and at least a portion of the second outer surface 212 has a second outer embossing portion 222 Can be formed. Here, the second outer embossing unit 222 may be included in the outer embossing unit 220.

The first binding portion 140 and the second binding portion 240 are formed on the inner hub portion 100 and the outer hub portion 200, thereby forming the first binding portion 140 and the second binding portion 240 Compared to the case where it is not, the amount of material required to manufacture the inner hub portion 100 and the outer hub portion 200 can be reduced, and the wheel hub 50 can be formed lighter.

The inner embossing unit 120 and the outer embossing unit 220 may be formed along a certain direction. In one embodiment, the inner embossing unit 120 and the outer embossing unit 220, at least a portion may be formed along the radial direction. Under this configuration, when the wheel hub 50 rotates, the magnitude of the maximum torque that can be transmitted between the inner embossing unit 120 and the outer embossing unit 220 may be increased. In another embodiment, the inner embossing unit 120 and the outer embossing unit 220 may be formed at least partially along the circumferential direction.

In one embodiment, each of the first inner embossing unit 121 and the second inner embossing unit 122 is formed in a radial direction to continuously connect to each other, and the first outer embossing unit 221 and the second outer embossing unit Each of 222 may be formed in a radial direction to continuously connect to each other. In this case, since the inner embossing unit 120 and the outer embossing unit 220 are each formed to have a continuous shape, the process of forming the inner embossing unit 120 on the inner surface 110 and the outer side on the outer surface 210 In the process of forming the embossing unit 220, it is possible to reduce the number of man-hours required.

8 is an exploded perspective view of a wheel hub 60 according to a third embodiment of the present disclosure, a perspective view showing an inner hub part and an outer hub part, and FIG. 9 is a wheel hub 60 according to a third embodiment of the present disclosure As an exploded perspective view of the inner hub portion and the outer hub portion is a perspective view showing a configuration viewed from a different angle from FIG. As described for the first embodiment, the inner hub portion 100 and the outer hub portion 200 are integrally formed by a forging method, and the bolt hole 12 is provided in a hole forming device (not shown) such as a drill. Can be formed at once. However, FIGS. 8 and 9 illustrate the inner hub portion 100 and the outer hub portion 200 in exploded perspective view for convenience of description.

In one embodiment, the first inner embossing unit 121 is formed in a circumferential direction so that the inner embossing unit 120 has a discontinuous shape, and the second inner embossing unit 122 is of the first inner embossing unit 121. The first outer embossing portion 221 is formed in a circumferential direction and the second outer embossing portion 222 is formed so as to be formed radially to end at the side portion 125 and the outer embossing portion 220 has a discontinuous shape. 1 may be formed in the radial direction to end on the side 225 of the outer embossing portion 221.

By forming the inner embossing unit 120 and the outer embossing unit 220 to have a discontinuous shape, respectively, while increasing the coupling force between the inner embossing unit 120 and the outer embossing unit 220, the amount of torque that can be simultaneously transmitted is increased. I can do it.

10 is a perspective view showing a wheel hub 70 according to a fourth embodiment of the present disclosure, and FIG. 11 is an exploded perspective view showing a wheel hub 70 according to a fourth embodiment of the present disclosure, the inner hub portion and the outer hub FIG. 12 is an exploded perspective view showing the wheel hub 70 according to the fourth embodiment of the present disclosure, and is a perspective view showing a configuration in which the inner hub portion and the outer hub portion are viewed in different directions from FIG. 11. As described for the first embodiment, the inner hub portion 100 and the outer hub portion 200 are integrally formed by a forging method, and the bolt hole 12 is provided in a hole forming device (not shown) such as a drill. Can be formed at once. However, in FIGS. 11 and 12, for convenience of description, the inner hub portion 100 and the outer hub portion 200 are illustrated in an exploded perspective view.

In one embodiment, the outer hub portion 200 is the third flange portion 250 in the embodiment illustrated in FIGS. 3 and 4 is removed, that is, the first flange portion 130 of the inner hub portion 100 ) It may be formed to include only the second flange portion 230 is coupled. By omitting the configuration of the third flange portion 250 in this way, it is possible to reduce the amount of metal material required to manufacture the outer hub portion 200, thereby achieving weight reduction of the wheel hub 70. .

Hereinafter, a specific configuration of a wheel hub according to an embodiment of the present disclosure will be described with reference to FIGS. 13 to 17. The specific configuration of the wheel hub disclosed below may be applied to each of the first to fourth embodiments independently, and two or more configurations may be applied in combination.

13 is an enlarged cross-sectional view of a wheel bearing 1 corresponding to B shown in FIG. 1.

As shown in FIG. 13, the outer hub portion 200 may be coupled to both the inner surface 110 and the outer circumferential surface 132 of the inner hub portion 100. In this case, since the outer hub portion 200 is formed integrally covering the inner surface 110 and the outer circumferential surface 132 of the inner hub portion 100, the inner hub portion 100 and the outer hub portion 200 are combined. Strength can be improved.

The wheel hub 10 may be directly coupled to a wheel of a vehicle, for example, through the first flange portion 130 and the second flange portion 230. In this case, in order to ensure the strength of the wheel hub 10, a configuration in which the thickness L1 of the first flange portion 130 of the inner hub portion 100 formed of a steel material is thick is preferable.

In one embodiment, the thickness L1 of the first flange portion 130 in the rotation axis direction may be greater than or equal to the thickness L2 of the second flange portion 230. In this case, the strength of the first flange portion 130 and the second flange portion 230 of the wheel hub 10 can be guaranteed.

14 is an enlarged cross-sectional view of a cross section of a wheel bearing corresponding to A shown in FIG. 1, and FIG. 15 is an enlarged cross-sectional view of a cross section of a wheel bearing corresponding to B shown in FIG. 1, both of FIGS. 14 and 15 are brazing It is a sectional view for explaining an embodiment using a filler material.

In one embodiment, a brazing filler metal 300 may be interposed in at least a portion between the inner surface 110 of the inner hub portion 100 and the outer surface 210 of the outer hub portion 200. The brazing filler metals 300 and 305 are metal or alloy materials, and may have a melting point of 450 ° C. or higher lower than the melting point of the material of the inner hub portion 100 and the material of the outer hub portion 200. A brazing filler metal 305 may be interposed between the outer circumferential surface 132 of the inner hub portion 100 and the outer hub portion 200.

The brazing filler metals 300 and 305 may include a paste type brazing filler metal or a film type brazing filler metal. For example, paste brazing filler metal is applied to at least a portion of the inner surface 110 of the inner hub portion 100 or the outer surface 210 of the outer hub portion 200, or the inner hub portion 100 and the outer hub portion After the film-type brazing filler material 300 is interposed on at least a part of the 200 and the paste-type brazing filler material is applied on the outer circumferential surface 132 of the inner hub portion 100 or the film-type brazing filler material 305 is interposed, the inner hub The part 100 and the outer hub part 200 may be integrally formed in the form of a wheel hub 10 by a forging method.

In the process that the inner hub portion 100 and the outer hub portion 200 are formed in the form of a wheel hub 10 by a forging method, the brazing filler metals 300 and 305 are heated to a temperature of 450 ° C. or higher, and some are melted. It can be coupled to the inner hub portion 100 and the outer hub portion 200. Thus, by interposing the brazing filler metal (300, 305) between the inner hub portion 100 and the outer hub portion 200, the coupling force between the inner hub portion 100 and the outer hub portion 200 can be improved.

In one embodiment, the brazing filler metal 300 may have a thickness of 10 to 100 micrometers.

The brazing filler metal 300 may have a shape in contact with the entire inner surface 110, the entire outer circumferential surface 132, and the entire outer surface 210. By this configuration, the coupling force between the inner hub portion 100 and the outer hub portion 200 can be improved.

16 is a perspective view showing a film-type brazing filler metal as an example of a brazing filler metal used in a wheel hub according to the first embodiment of the present disclosure.

In one embodiment, the film-type brazing filler material 300 may be a flat film shape having a first surface 310 facing the outer hub portion 200 and a second surface 320 facing the inner hub portion 100. . In one embodiment, the film-type brazing filler metal 300 may be formed of a single-layer structure, a two-layer structure or a three-layer structure in which each layer is made of a different material.

FIG. 17 is a perspective view showing the shape of the brazing filler material when the film-type brazing filler material shown in FIG. 16 is integrally coupled with the inner hub part and the outer hub part, and FIG. 18 is a film of the wheel hub shown in FIG. 17. It is a sectional view showing the cross section of the mold brazing filler metal cut in the EE direction.

The shape of the first surface 310 and the second surface 320 of the film-type brazing filler material 300 is the inner hub portion 100, the outer hub portion 200, and the film-type brazing filler metal 300 by the forging method. When integrally formed, it may be formed by the shape of the outer surface 210 and the inner surface 110. For example, the shape of the first surface 310 of the film-type brazing filler metal 300 is the outer hub part (as the film-type brazing filler metal 300 is combined with the inner hub portion 100 and the outer hub portion 200) It may have a shape corresponding to the shape of at least a portion of the outer surface 210 of 200, the shape of the second surface 320 of the film-type brazing filler material 300, the inner surface 110 of the inner hub portion 100 ) May have a shape corresponding to at least a portion of the shape.

By such a configuration, the bonding force between the inner hub portion 100 and the outer hub portion 200 is coupled between the inner surface 110 and the outer surface 210 without exerting excessive mechanical stress on the film-type brazing filler material 300. Improve it.

According to another embodiment of the present disclosure, a wheel bearing is provided that includes a wheel hub according to the first to fourth embodiments and a wheel hub including a specific configuration of the wheel hub described above.

19 is an enlarged cross-sectional view of a wheel bearing corresponding to C shown in FIG. 1.

When power is transmitted, mechanical stress may be concentrated on a portion of the wheel hub 10 that the rolling element 20 contacts. Therefore, in order to ensure the strength of the wheel hub 10 during power transmission, it is preferable to increase the thickness of the inner hub portion 100 formed of a steel material at a portion where the rolling element 20 contacts.

In one embodiment, the rolling element 20 may be a ball-shaped rolling element 20. In this case, the thickness L3 of the inner hub portion 100 in the direction defined to extend from the center of the rolling element 20 to the portion where the rolling element 20 contacts the wheel hub 10 is the rolling element 20 ) May be greater than or equal to the radius (R). In this case, it is possible to ensure the strength at the portion where the rolling element 20 and the wheel hub 10 contact the wheel hub 10.

The direction defined to extend from the center of the rolling element 20 to the portion where the rolling element 20 contacts the wheel hub 10 may be formed at an angle of 30 to 40 degrees with the Y-axis (-) direction.

Although the technical spirit of the present disclosure has been described by the examples shown in the accompanying drawings and some embodiments, the technical spirit and scope of the present disclosure can be understood by those skilled in the art to which the present disclosure pertains. It will be appreciated that various substitutions, modifications and changes can be made in the range. In addition, such substitutions, modifications and variations should be considered within the scope of the appended claims.

1: wheel bearing, 10, 50, 60, 70: wheel hub, 12: bolt hole 20: rolling element, 30: inner ring, 40: outer ring, 100: inner hub portion, 200: outer hub portion, 300: brazing filler metal, 110: inner surface, 120: inner embossing portion, 130: first flange portion, 140: first binding portion, 150: cylindrical portion, 210: outer surface, 220: outer embossing portion, 230: second flange portion, 240: Second binding portion, 250: third flange portion, 310: first surface, 320: second surface, 111: first inner surface, 112: second inner surface, 121: first inner embossing portion, 122: second Inner embossing portion, 123: protrusion, 211: first outer surface, 212: second outer surface, 221: first outer embossing portion, 222: second outer embossing portion, 223: groove

Claims (15)

A wheel hub used in a wheel bearing disposed between a vehicle suspension and a wheel,
An inner hub portion formed of a steel material and disposed toward the suspension device; And
And an outer hub portion formed of a lightweight alloy material and disposed toward the wheel,
The inner hub portion has an inner surface facing the outer hub portion, and an inner embossing portion is formed on at least a portion of the inner surface,
The outer hub portion has an outer surface facing the inner hub portion, and at least a portion of the outer surface, an outer embossing portion having a shape corresponding to the shape of the inner embossing portion is formed, a wheel hub. According to claim 1,
The inner embossing portion includes at least one protrusion protruding from the inner surface toward the outer hub portion,
The outer embossing portion includes at least one groove having a shape corresponding to the protrusion,
The protrusion is fitted to the groove, the wheel hub. According to claim 2,
The inner hub portion includes a cylindrical portion and a first flange portion extending radially from the cylindrical portion,
The outer hub portion includes a second flange portion coupled to the first flange portion, the wheel hub. According to claim 3,
The inner embossing portion includes a first inner embossing portion formed on at least a portion of the inner surface of the first flange portion,
The outer embossing portion includes a first outer embossing portion formed on at least a portion of the outer surface of the second flange portion,
The first outer embossing portion is formed in a shape corresponding to the shape of the first inner embossing portion, the wheel hub. According to claim 4,
The inner embossing portion further includes a second inner embossing portion, and the outer embossing portion further includes a second outer embossing portion,
The second outer embossing portion has a shape corresponding to the shape of the second inner embossing portion, a wheel hub. The method of claim 5,
The inner hub portion further includes a first binding portion formed to be recessed in a direction toward the suspension device,
The outer hub portion is formed to be recessed in the direction toward the suspension device and further includes a second binding portion formed to surround the first binding portion,
The second inner embossing portion is formed on at least a portion of the inner surface of the first binding portion,
The second outer embossing portion is formed on at least a portion of the outer surface of the second binding portion, the wheel hub. The method of claim 6,
Each of the first inner embossing portion and the second inner embossing portion is formed to extend in the same direction to continuously connect to each other,
Each of the first outer embossing portion and the second outer embossing portion is formed by extending in the same direction to continuously connect to each other, a wheel hub. The method of claim 7,
Each of the first inner embossing portion and the second inner embossing portion is formed to extend in a radial direction to continuously connect to each other,
Each of the first outer embossing portion and the second outer embossing portion is formed by extending in a radial direction to continuously connect to each other, a wheel hub. The method of claim 6,
The first inner embossing portion and the second inner embossing portion are formed to extend in different directions from each other,
The first outer embossing portion and the second outer embossing portion are formed by extending in different directions from each other, a wheel hub. The method of claim 9,
A wheel hub in which at least a portion between the inner surface of the inner hub portion and the outer surface of the outer hub portion is interposed with a film-type brazing filler metal or a paste-type brazing filler metal. The method of claim 10,
The brazing filler metal is a film-type brazing filler metal,
The film-type brazing filler metal has a first surface facing the outer hub portion, and the shape of the first surface has a shape corresponding to at least a portion of the outer surface of the outer hub portion,
The film-type brazing filler metal has a second surface facing the inner hub, and the shape of the second surface has a shape corresponding to a shape of at least a portion of the inner surface of the inner hub. The method of claim 11,
The film-type brazing filler metal is a single-layer structure, a wheel hub formed of a two-layer structure or a three-layer structure in which each layer is made of different materials. The method of claim 12,
The brazing filler metal has a thickness of 10 to 100 micrometers, a wheel hub. In the wheel bearing disposed between the vehicle suspension and the wheel,
An outer ring coupled to one side of the suspension device;
A wheel hub according to claim 13 rotatably coupled to the outer ring; And
A wheel bearing comprising at least one rolling element interposed between the outer ring and the wheel hub. The method of claim 14,
The rolling element is a ball-shaped rolling element,
A wheel bearing in which a thickness of an inner hub portion in a direction defined to extend from the center of the rolling element to a portion in contact with the wheel hub is greater than or equal to a radius of the rolling element.

Images