KR102119259B1 - Wheel bearing assembly - Google Patents

Abstract

The present disclosure provides a wheel bearing assembly. The wheel bearing assembly includes a wheel hub comprising an outer hub portion made of a first material comprising a lightweight metal and an inner hub portion made of a second material made of a steel material, and an axial direction of the wheel hub to contact the inner end of the inner hub portion. A joint that is centrally engaged with the wheel hub, a wheel hub and an outer ring spaced from each of the joints, a rolling device interposed between the wheel hub and the outer ring, and between the joint and the outer ring, and the wheel passing through the wheel hub and joint in the axial direction And at least one screw coupling the hub and the joint to each other.

Description

Wheel bearing assembly{WHEEL BEARING ASSEMBLY}

The present disclosure relates to a wheel bearing assembly.

The wheel bearing assembly is a device mounted between a rotating element and a non-rotating element to facilitate rotation of the rotating element. The wheel bearing assembly of the vehicle provides a function for moving the vehicle by rotatably connecting the wheel to the vehicle body. Such a wheel bearing assembly may be divided into a driving wheel wheel bearing that transmits power generated in an 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 is adapted to rotate with the drive shaft by 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 the rotating element is not connected to the drive shaft.

The wheel bearing assembly occupies a considerable weight in the drive system of a vehicle, and various studies are underway to reduce it. In addition, although various attempts have been made to reduce the weight of the wheel bearing assembly, 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 vehicle.

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

In addition, a wheel bearing assembly in which a wheel hub and a joint are coupled by screws is provided.

A wheel bearing assembly according to an embodiment of the present disclosure, comprising: a wheel hub including an outer hub portion made of a first material comprising a lightweight metal and an inner hub portion made of a second material comprising a steel material; A joint coupled with the wheel hub about an axial direction of the wheel hub to contact the inner end of the inner hub portion; An outer ring spaced from each of the wheel hub and the joint; A rolling device interposed between the wheel hub and the outer ring and between the joint and the outer ring; And at least one screw penetrating the wheel hub and the joint in the axial direction to couple the wheel hub and the joint to each other.

According to an embodiment, the first through hole, the second through hole, and the recess are respectively formed in the outer hub portion, the inner hub portion, and the joint, and the first through hole, the second through hole, and the recess are shafts. Aligned along the direction, a screw receiving portion receiving at least one screw may be formed in any one of the first through hole, the second through hole, and the recess.

According to one embodiment, at least a portion of the inner circumferential surface of each of the second through hole and the recess may be formed with a screw thread configured to mesh with the screw thread.

According to one embodiment, at least a portion of the inner circumferential surface of the recess may be formed with a screw thread configured to mesh with the screw thread.

According to one embodiment, the wheel hub includes a flange portion composed of a portion of the outer hub portion and a portion of the inner hub portion, the flange portion is formed with a wheel bolt hole, the screw receiving portion is a straight line connecting the center and axial direction of the wheel bolt hole Can be placed on.

According to an embodiment, a plurality of wheel bolt holes and a screw accommodating portion may be provided, and a plurality of wheel bolt holes and a plurality of screw accommodating portions may be symmetrically arranged to have a constant interval in a circumferential direction surrounding each axial direction.

According to one embodiment, a part of the inner hub portion is disposed on the outer circumference of the outer hub portion to support the transmission device interposed between the wheel hub and the outer ring.

According to one embodiment, the outer hub portion includes a wheel center portion protruding in the axial direction, and the screw receiving portion may be formed at a position closer to the axial direction than the wheel center portion.

According to one embodiment, the inner hub portion and the outer hub portion may be integrally formed through a semi-melting forging method.

According to one embodiment, a plurality of gear teeth may be formed at an end portion of the joint located on the opposite side of the axial direction of the wheel hub.

A wheel bearing assembly according to an embodiment of the present disclosure, comprising: a wheel hub including an outer hub portion made of a first material comprising a lightweight metal and an inner hub portion made of a second material comprising a steel material; A connecting member coupled with the wheel hub about an axial direction of the wheel hub to contact the inner end of the inner hub portion; An outer ring spaced from each of the wheel hub and the connecting member; A rolling device interposed between the wheel hub and the outer ring and between the connecting member and the outer ring; And at least one screw penetrating the wheel hub and the connecting member in the axial direction to couple the wheel hub and the connecting member to each other, wherein an end of the connecting member positioned opposite the axial direction with respect to the wheel hub is perpendicular to the axial direction. A plurality of gear teeth may be formed in the direction.

A wheel bearing assembly according to another embodiment of the present disclosure, comprising: a wheel hub including an outer hub portion made of a first material comprising a lightweight metal and an inner hub portion made of a second material comprising a steel material; A joint coupled with the wheel hub about an axial direction of the wheel hub to contact the inner end of the inner hub portion; An inner ring coupled on the outer circumferential surface of the joint; An outer ring spaced from each of the wheel hub and the inner ring; A plurality of rolling devices interposed between the wheel hub and the outer ring and between the inner ring and the outer ring; And at least one screw penetrating the wheel hub and the joint in the axial direction to couple the wheel hub and the joint to each other.

According to an embodiment, at least one protrusion may be formed at the inner end of the inner ring facing the joint in the axial direction, and at least one groove may be formed at the joint to accommodate the at least one protrusion.

According to one embodiment, the inner ring may be press-fit on the outer circumferential surface of the joint to be detachable from the joint by a certain level of external force.

According to one embodiment, the inner ring may be coupled on the outer circumferential surface of the joint in a loose fitting manner.

According to an embodiment, the first through hole, the second through hole, and the recess are respectively formed in the outer hub portion, the inner hub portion, and the joint, and the first through hole, the second through hole, and the recess are shafts. Aligned along the direction, a screw receiving portion accommodating at least one screw may be formed in any one of the first through hole, the second through hole, and the recess.

According to one embodiment, at least a portion of the inner circumferential surface of each of the second through hole and the recess may be formed with a screw thread configured to mesh with the screw thread.

A wheel bearing assembly according to another embodiment of the present disclosure, comprising: a wheel hub including an outer hub portion made of a first material comprising lightweight metal and an inner hub portion made of a second material comprising steel material; A connecting member coupled with the wheel hub about an axial direction of the wheel hub to contact the inner end of the inner hub portion; An inner ring coupled on the outer circumferential surface of the connecting member; An outer ring spaced from each of the wheel hub and the inner ring; A plurality of rolling devices interposed between the wheel hub and the outer ring and between the inner ring and the outer ring; And at least one screw penetrating the wheel hub and the connecting member in the axial direction to couple the wheel hub and the connecting member to each other, wherein an end of the connecting member positioned opposite the axial direction with respect to the wheel hub is perpendicular to the axial direction. A plurality of gear teeth may be formed in the direction.

According to embodiments of the present disclosure, a lightweight metal material may be applied to the wheel hub to reduce the weight of the wheel hub.

In addition, separation of a portion comprising a steel material and a portion containing a light metal in the wheel hub according to embodiments of the present disclosure can be prevented.

Further, according to embodiments of the present disclosure, the volume of the joint coupled with the wheel hub can be reduced, thereby reducing the weight of the joint.

In addition, according to embodiments of the present disclosure, maintenance and repair (A/S) efficiency may be increased since the inner ring is detachably coupled from the joint.

Further, according to embodiments of the present disclosure, a gear tooth may be formed at an end of the joint to enhance driving force.

1 is a cross-sectional view showing a wheel bearing assembly according to a first embodiment of the present disclosure.
2 is a front view showing a state viewed from the front of the wheel bearing assembly according to the first embodiment of the present disclosure.
3 is a cross-sectional view showing another embodiment of a wheel bearing assembly according to a first embodiment of the present disclosure.
FIG. 4 is a rear view showing the wheel bearing assembly shown in FIG. 3 when viewed from the rear.
5 is a cross-sectional view showing a wheel bearing assembly according to a second embodiment of the present disclosure.
6 is a cross-sectional view showing another embodiment of a wheel bearing assembly according to a second embodiment of the present disclosure.
FIG. 7 is a rear view showing a state in which the inner ring of the wheel bearing assembly shown in FIG. 6 is viewed from the rear.
8 is a cross-sectional view showing another embodiment of a wheel bearing assembly according to a second embodiment of the present disclosure.

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 the specific description of these embodiments.

All technical and scientific terms used in the present disclosure, unless defined otherwise, have meanings generally understood by those of ordinary skill 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”, and the like, are open terms that imply the possibility of including other embodiments, unless stated otherwise 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 a component is referred to as being “connected” to another component, the component may be directly connected to the other component, or may be connected via another new component. It should be understood.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the accompanying drawings, identical or corresponding components 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 axial direction may be defined to mean a direction parallel to the rotational axis (RA) of the wheel bearing assembly, and the radial direction may be defined to mean a direction away from the rotation axis, and a circumference. The direction may be defined to mean a direction surrounding the rotation axis RA around the rotation axis RA.

1 is a cross-sectional view showing a wheel bearing assembly 1 according to a first embodiment of the present disclosure.

The wheel bearing assembly 1 is disposed between the vehicle's suspension (not shown) and the wheel (not shown) to rotate the wheel relative to the suspension. In one embodiment, the wheel bearing assembly 1 may have a shape symmetrical about the rotation axis RA. Here, the wheel bearing assembly 1 may be a driving wheel wheel bearing assembly. For example, the wheel bearing assembly 1 used as a driving wheel has a central portion 80 including a rotating shaft RA penetrated therein, and a driving shaft (not shown) may be inserted into the central portion 80.

The arrow'D1' is a direction along the rotation axis of the wheel bearing assembly 1 and points to the outside of the axis in which the wheel is disposed relative to the wheel hub 100, and the arrow'D2' is the opposite direction of D1 to the wheel hub 10 It points to the inner side of the axis where the knuckle is placed. Hereinafter, the rotational axis direction of the wheel bearing assembly 1 may be simply referred to as an'axial direction RA'. In addition, the arrow'D3' indicates a radially outward direction away from the rotational axis in a radial direction with respect to the rotational axis of the wheel bearing assembly 1, and the arrow'D4' indicates a radially inner direction opposite to D3. In addition, the arrow'D5' indicates a direction of rotation about the rotation axis, that is, a circumference direction.

The wheel bearing assembly 1 may include a wheel hub 10, an outer ring 20, transmission devices 31 and 32, sealing devices 41 and 42, and a joint 60. The suspension device can be disposed in the axially inward direction D2 of the wheel bearing assembly 1, and the wheel can be disposed in the axially outward direction D1 of the wheel bearing assembly 1. The vehicle body may be positioned in the radially outer direction D3 of the wheel bearing assembly 1 based on FIG. 1, and the ground may be positioned in the radially inner direction D4 of the wheel bearing assembly 1. The outer ring 20 may be disposed spaced apart from each of the wheel hub 10 and the joint 60. In addition, the outer ring 20 can be coupled to one side of the suspension device. That is, the outer ring 20 may be provided as a non-rotating element, and may be configured so that the position does not move after being coupled to one side of the suspension device. The outer ring 20 can be fixed in position, for example, by being coupled to a knuckle (not shown) of the suspension device. The outer ring 20 may be formed with a coupling hole 25 for coupling with the knuckle (not shown).

In one embodiment, the transmission devices 31 and 32 are the transmission device 31 interposed between the outer ring 20 and the wheel hub 10 and the transmission device 32 interposed between the outer ring 20 and the joint 60. ). The transmission devices 31 and 32 may include, for example, a retainer and a plurality of balls accommodated in the retainer. As shown in FIG. 1, the ball-shaped transmission devices 31 and 32 contact the outer ring 20 in the radially outward direction D3, and the wheel hub 10 or the joint 60 in the radially inward direction D4. ). In the present embodiment, the transmission devices 31 and 32 are provided in two rows, but may be provided in three or more rows depending on the structure of the wheel bearing assembly. Therefore, the wheel hub 10 and the joint 60 are provided with two or more rows of the wheel hub 10 and the joint 60, so the wheel hub 10 and the joint 60 are provided with an outer ring ( 20) can be stably rotated.

According to one embodiment, the joint 60 may be a constant velocity joint (CVT). The constant velocity joint may include a universal joint, and may be configured to connect a drive shaft and a portion corresponding to a rotating body of the wheel bearing assembly. There are several types of constant velocity joints, for example, a Bendix type, a wave type, and a Berfield type, and a Berfield type can be applied to a front wheel drive vehicle. The portion 61 extending in the axial inner direction D2 from the joint 60 may constitute the housing of the constant velocity joint. A drive shaft (not shown) and parts (not shown) for rotating the drive shaft may be inserted into the space 62 surrounded by the housing.

The wheel hub 10 may be composed of at least two different materials, and may be rotatably coupled to the outer ring 20 by the transmission device 31. In addition, the wheel hub 10 can be directly coupled to the wheel of the vehicle. Under this structure, the wheel hub 10 can rotate simultaneously with the wheel when the wheel rotates.

The wheel hub 10 may include an outer hub portion 110 and an inner hub portion 120. According to one embodiment, the outer hub portion 110 may be composed of a first material comprising a lightweight metal, and the inner hub portion 120 may be composed of a second material comprising a steel material. Here, the first material may be composed of a lightweight alloy material including a light weight metal, and the second material may be composed of carbon steel including a steel material. For example, the lightweight alloy material may be composed of an alloy including one or more of lightweight alloys such as aluminum, magnesium, titanium, or a combination thereof. Accordingly, the strength of the second material can be configured to be greater than the strength of the first material.

In one embodiment, the wheel hub 10 may include a flange portion 11 composed of a portion 111 of the outer hub portion 110 and a portion 121 of the inner hub portion 120. A wheel bolt hole 15 is formed in the flange portion 11, and a wheel bolt (not shown) may be coupled to the wheel bolt hole 15 formed in the flange portion 11. Under this structure, the wheel bolt can pass through the hole formed in the wheel to fix the position of the wheel with respect to the wheel hub 10. Further, when the wheel bolt passes through part 111 of the outer hub portion 110 and part 121 of the inner hub portion 120 at the same time, the wheel bolt can be configured to further strengthen the bonding force between dissimilar materials. have.

Referring to Figure 1, most of the thickness of the flange portion 11 is occupied by a portion 111 of the outer hub portion 110, but is not limited to this shape, depending on the required rigidity of the flange portion 11 The thickness occupied by a portion 121 of the inner hub portion 120 may be increased. For example, the portion where the wheel bolt hole 15 is formed may be difficult to meet the required stiffness when only the first material is used in the process of driving the vehicle, so that the inner hub portion within the flange portion 11 ( 120) by increasing the thickness of a portion 121, the rigidity of the portion can be improved.

In one embodiment, the inner hub portion 120 and the outer hub portion 110 may be integrally formed through a forging or casting method. In the case of the forging method, for example, a semi-melting forging method may be applied. The semi-melt forging method may refer to a method in which a forged object is compressed in a semi-melted state after being heated in a semi-melted state, rather than a method in which the object is compressed in a complete liquid or a complete solid state. Here, the half-use 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 the semi-melting forging method, the inner hub portion 120 and the outer hub portion 110 may be integrally formed by being compressed in a semi-melting state after being heated to a temperature above a certain level, respectively.

In the case of the forging method, the inner hub portion 120 and the outer hub portion 110 may be integrally formed in one mold from separate preform states, and in the case of the casting method, the first and second molten into the assembled mold. The wheel hub can be integrally formed by simultaneously injecting the material. Even if integrally formed in the above-described manner, since it is difficult to completely exclude the possibility of separation between the inner hub portion 120 and the outer hub portion 110, the inner hub portion 120 and the outer hub portion through the screw 70 The bonding between the different materials of 110 may be strengthened.

In one embodiment, a screw 70 may be provided that engages the wheel hub 10 and joint 60. The screw 70 may penetrate the wheel hub 10 and the joint 60 in the axial inner direction D2 to couple the wheel hub 10 and the joint 60 to each other. The screw 70 may first penetrate the outer hub portion 110 and the inner hub portion 120 and then be inserted into the joint 60. In this process, the screw 70 can strengthen the coupling of the inner hub portion 120 and the outer hub portion 110, and the joint 60 can be combined with the wheel hub 10.

The joint 60 may be coupled to the wheel hub 10 around the axial direction RA of the wheel hub 10 to contact the inner end 128 of the inner hub portion 120. For example, the inner end 128 is formed to have a larger diameter than the outer end 64 of the joint 60, so that the inner end 128 can be disposed in a radially outward direction D3 compared to the outer end 64. have. Thus, the inner end 128 can surround the outer end 64. That is, the outer end 64 of the joint 60 can be inserted into the space formed by the inner end 128 of the wheel hub 10. In addition, after the wheel hub 10 and the joint 60 are combined, the inner circumferential surface 16 of the wheel hub 10 and the inner circumferential surface 66 of the joint 60 may be smoothly connected to each other.

In a manner different from the present embodiment, the wheel hub 10 and the joint 60 may be coupled by tightening a nut at an end of the drive shaft passing through the central portion 80 of the wheel hub 10. Compared to this method, the wheel bearing assembly 1 according to the present embodiment uses an external force acting on the drive shaft because the wheel hub 10 and the joint 60 are coupled through the screw 70 without tightening the drive shaft with a nut. It can be removed, thereby improving the durability of the drive shaft. Moreover, since the separation and assembly of the joint 60 and the wheel hub 10 can be made simpler by using the screw 70, the efficiency of maintenance and repair work can be increased.

In one embodiment, the first through hole 115, the second through hole 125, and the recess 65 are formed in the outer hub portion 110, the inner hub portion 120, and the joint 60, respectively. Can. In addition, the first through hole 115, the second through hole 125, and the recess 65 are aligned along the axial inner direction D2 to form a screw receiving portion 17 for receiving the screw 70 can do. That is, the screw receiving portion 17 may have a cylindrical space. For example, it may have a shape corresponding to the screw portion of the screw 70.

The outer hub portion 110 may include a wheel center portion 114 protruding in the axial outer direction D1. The wheel of the vehicle is aligned to have the same rotation axis as the rotation axis RA of the wheel hub 10 by the wheel center portion 114, and may be combined with the wheel hub 10 by a wheel bolt. Further, the screw receiving portion 17 may be formed in the engaging region 12, and the engaging region 12 may be formed in the radially inner direction D4 than the wheel center portion 114. Accordingly, the screw 70 can firmly couple the wheel hub 10 and the joint 60 between the wheel center portion 114 and the axial direction RA.

In one embodiment, at least a portion of the inner circumferential surfaces 63 and 123 of each of the recess 65 and the second through hole 125 may be formed with a thread, which may be configured to mesh with the thread of the screw 70. . Since the strength of the outer hub portion 110 may be configured to be lower than the strength of the inner hub portion 120, in order to prevent deformation of the outer hub portion 110, a screw thread is formed on the inner circumferential surface 113 of the first through hole 115 It may not form. Since the inner hub portion 120 and the joint 60 are made of a metal having relatively high strength, there is a risk of deformation even if threads are formed on the inner circumferential surfaces 123 and 63 of the second through-hole 125 and the recess 65, respectively. This may not be high. In addition, the screw 70 may be pressed against the inner hub portion 120 in the axial inner direction (D2) of the outer hub portion 110 in the process of being inserted while being engaged with the screw lines formed on the inner circumferential surfaces 123 and 63. , The coupling between the outer hub portion 110 and the inner hub portion 120 may be improved. In another embodiment, a thread is not formed on the inner circumferential surface 123 of the second through-hole 125, and a thread is formed only on the inner circumferential surface 63 of the recess 65 to be configured to mesh with the thread of the screw 70. Can be.

A portion 122 of the inner hub portion 120 is disposed on the outer circumference portion 112 of the outer hub portion 110 to support the power transmission device 31 interposed between the wheel hub 10 and the outer ring 20. Can be. As illustrated in FIG. 1, a portion of the wheel hub 10 that is coupled to the transmission device 31 may correspond to a portion having a high supporting load required in the wheel bearing assembly 1, which portion is inside. Since it can be configured as a hub portion 120, the stiffness required at an appropriate position in the wheel bearing assembly 1 can be secured. On the contrary, since the flange portion 11 of the wheel hub 10 corresponds to a portion where the required supporting load is relatively low, this portion is composed of a material containing a light metal and a material containing steel. , While reducing the overall load of the wheel hub 10, the required stiffness of the part can be secured.

FIG. 2 is a front view showing the wheel bearing assembly 1 according to the first embodiment of the present disclosure as viewed from the front.

Referring to FIG. 1, a plurality of wheel bolt holes 15 and a screw receiving portion 17 may be provided. According to an embodiment, the plurality of wheel bolt holes 15 and the plurality of screw receiving portions 17 may be symmetrically arranged to have a constant interval in the circumferential direction D5 with respect to the axial direction RA, respectively. For example, a plurality of wheel bolt holes 15 and a plurality of screw receiving portions 17 may also be provided in five. Accordingly, the plurality of wheel bolt holes 15 and the plurality of screw receiving portions 17 may each form an pentagon. In this embodiment, each of the wheel bolt holes 15 and the screw receiving portions 17 has been described as being provided, but each of the wheel bolt holes 15 and the screw receiving portions 17 is provided in a plurality of numbers. The number of the wheel bolt holes 15 and the screw receiving parts 17 may be the same or different.

In one embodiment, as shown in Figure 2, the screw receiving portion 17 may be disposed on a straight line connecting the center (O ₁ ) and the axial direction (RA) of the wheel bolt hole 15. Accordingly, the joint 60 can be aligned in a predetermined direction with respect to the wheel hub 10. In addition, when the wheel hub 10 is rotated by the drive shaft, since the wheel bolt coupled to the wheel bolt hole 15 is disposed in line with the screw 70, deformation of the flange portion 11 can be prevented. .

3 is a cross-sectional view showing an embodiment of a different form from the wheel bearing assembly 1 according to the first embodiment of the present disclosure, and FIG. 4 shows the wheel bearing assembly 1 shown in FIG. 3 as viewed from the rear. This is the rear view. Descriptions overlapping with the contents described in the above-described embodiment will be omitted.

As shown in FIG. 3, the screw 70 penetrates the outer hub portion 110 and the inner hub portion 120, and ends of the screw 70 can be accommodated in the connecting member 90. The connecting member 90 may have a rotating body shape and may be connected to the suspension device. A portion of the screw portion of the screw 70 is engaged with a screw thread formed on the inner circumferential surface 123 of the second through hole 125 of the inner hub portion 120, and the other portion of the recess 92 of the connecting member 90 It can be engaged with the thread formed on the inner peripheral surface (93). In another embodiment, a thread is formed only on the inner circumferential surface 93 of the recess 92 of the connecting member 90 to be engaged with the threaded portion of the screw 70.

Referring to FIG. 3, it can be seen that a connection member 90 of a different shape from the joint 60 shown in FIG. 1 is applied. The joint 60 shown in FIG. 1 has a form extending in the axial inner direction D2, but the connecting member 90 shown in FIG. 3 is not formed to extend in this form. In one embodiment, a plurality of gear teeth 951 in a direction perpendicular to the axial direction RA is provided at the end portion 95 of the connecting member 90 located on the axial inner direction D2 side of the wheel hub 10 It can be formed.

Referring to Figure 4, the length of the gear teeth 951 (R), the tooth (951) based on one-half of the difference between the starting diameter (R ₂₎ and diameter (R ₁₎ a tooth end Can be defined by Accordingly, the size of the length R of the gear teeth 951 may be adjusted by adjusting at least one of the diameter R _{2 of the} gear teeth 951 starting and the diameter R _{1 of the} gear teeth ending. In addition, as the length R of the gear teeth 951 increases, the driving force transmitted to the wheel hub 10 may increase, and the length R of the gear teeth 951 may vary depending on the type of vehicle and/or the performance of the wheel bearing. ) Can be determined.

5 is a cross-sectional view showing a wheel bearing assembly 2 according to a second embodiment of the present disclosure. Descriptions overlapping with the contents described in the above-described embodiment will be omitted. Unlike the wheel bearing assembly 1 illustrated in FIG. 1, the wheel bearing assembly 2 according to the second embodiment may further include an inner ring 50.

The wheel bearing assembly 2 may include a wheel hub 10, an outer ring 20, transmission devices 31, 32, sealing devices 41, 42, an inner ring 50, and a joint 210. The wheel hub 10 may include an outer hub portion 110 made of a first material made of a lightweight metal and an inner hub portion 120 made of a second material made of a steel material. The joint 210 may be combined with the wheel hub 10 around the axial direction RA of the wheel hub 10 to contact the inner end of the inner hub portion 120. The inner ring 50 may be coupled on the outer circumferential surface 214 of the joint 210. The outer ring 20 may be disposed spaced apart from each of the wheel hub 10 and the inner ring 50. The rolling device 31 may be interposed between the wheel hub 10 and the outer ring 20, and the rolling device 32 may be interposed between the inner ring 50 and the outer ring 20. In addition, the portion 211 extending in the axial inner direction D2 in the joint 210 may constitute a housing (not shown) of the constant velocity joint. In addition, a drive shaft and components (not shown) that rotate the drive shaft may be inserted into the space 212 enclosed by the housing.

In one embodiment, the screw 70 may penetrate the wheel hub 10 and the joint 210 in the axial direction RA to couple the wheel hub 10 and the joint 210 to each other. A first through hole 115, a second through hole 125, and a recess 215 may be formed in the outer hub portion 110, the inner hub portion 120, and the joint 210, respectively. In addition, a screw thread may be formed on at least a portion of the inner circumferential surfaces 123 and 213 of each of the second through hole 125 and the recess 215, which may be configured to mesh with the screw thread of the screw 70.

In one embodiment, the inner ring 50 may be pressed from the joint 210 onto the outer circumferential surface 214 of the joint 210 to be detachable by a certain level of external force. For example, the inner ring 50 may be coupled on the outer circumferential surface 214 of the joint 210 in a loose fitting manner. Here, the relaxed fit method is different from the interference fitting method in which the two parts are inseparably coupled, but the two parts are combined in a press-in method, but in the case of applying a certain level of external force, the parts are separated without damaging each part. Can be defined. For example, the inner circumferential surface 52 of the inner ring 50 and the outer circumferential surface 214 of the joint 210 may each be formed of a smooth surface, and do not have a configuration that constrains positions with respect to each other. Thus, in the wheel bearing assembly 2, when removing the screw 70, the inner ring 50 is not separated, only the joint 210 can be separated. In the case of a wheel bearing assembly in which the inner ring and the joint are press-fit in a press-fit manner, if the joint has a problem, a situation in which the joint or the entire wheel bearing must be replaced may occur. On the other hand, the wheel bearing assembly 2 according to the second embodiment can be separated only by the joint 210, so if there is a problem with the joint 210 or the inner ring 50, only the corresponding parts are replaced. As it can be solved, the efficiency of maintenance and repair can be increased.

6 is a cross-sectional view showing an embodiment of a different form from the wheel bearing assembly 2 according to the second embodiment of the present disclosure, and FIG. 7 is a rear view of the inner ring 50 of the wheel bearing assembly 2 shown in FIG. 6 It is a rear view showing the state seen from. Descriptions overlapping with the contents described in the above-described embodiment will be omitted.

In the wheel bearing assembly 2 shown in FIG. 5, since no means for restraining the position between the inner ring 50 and the joint 210 is provided, when the joint 210 rotates at high speed, the inner ring 50 A vague situation may occur with respect to this joint 210. Accordingly, in order to prevent such an idle situation, the structures of the protrusions 51 and the grooves 213 may be provided in each of the inner ring 50 and the joint 210 in FIGS. 6 and 7.

In one embodiment, at least one protrusion 51 may be formed at the inner end 53 of the inner ring 50 facing the joint 210 in the axial direction RA. Also, at least one groove 213 accommodating at least one protrusion 51 may be formed in the joint 210. Here, the groove 213 may have a shape complementary to the protrusion 51. When the protrusion 51 is inserted into the groove 213, the movements of the joint 210 and the inner ring 50 are constrained with each other, thereby preventing the above-mentioned idle situation.

The protrusion 51 may have a tapered shape, for example. In addition, the groove 213 may have a shape in which the cross-sectional area decreases as the depth increases. For example, the protrusion 51 may have a truncated truncated truncated cone shape, or alternatively, it may have a truncated truncated cone or triangular truncated truncated cone. Therefore, when the protruding portion 51 is inserted into the groove 213, the inclined surface of the protruding portion 51 and the inclined surface of the groove 213 come into contact with each other, so that frictional forces can be applied to each other. Based on this, the support force of the joint 210 with respect to the inner ring 50 may be increased.

Referring to FIG. 7, a plurality of protrusions 51 may be provided and may be symmetrically arranged. In addition, referring to FIG. 2, a protrusion may be disposed on a straight line connecting the wheel bolt hole 15 and the axial direction RA. For example, five protrusions 51 may be provided, and five protrusions 51 may form an pentagon.

8 is a cross-sectional view showing another embodiment of a wheel bearing assembly 2 according to a second embodiment of the present disclosure. Descriptions overlapping with the contents described in the above-described embodiment will be omitted.

The screw 70 may engage the outer hub portion 110 and the inner hub portion 120 and the connecting member 220 while moving in the axial inner direction D2. The connecting member 220 may have a rotating body shape and may be connected to the suspension device. In this process, the protruding portion 51 formed on the inner ring 50 may be inserted into the groove 223 formed in the connecting member 220 in the axial inner direction D2. Accordingly, rotation of the outer hub portion 110, the inner hub portion 120, the inner ring 50, and the connecting member 220 may be synchronized with each other.

Referring to FIG. 8, it can be seen that a connection member 220 of a different shape from the joint 210 shown in FIG. 5 is applied. The joint 210 shown in FIG. 5 has an extended form in the axial inner direction D2, but the connecting member 220 shown in FIG. 8 is not extended in such a form. In addition, a plurality of gear teeth 227 may be formed at an end 225 of the connecting member 220 positioned on the opposite side of the axial direction RA of the wheel hub 10 in a direction perpendicular to the axial direction RA. have. Here, the plurality of gear teeth 227 may provide the same or similar configuration and function to the plurality of gear teeth 951 described in FIG. 3.

According to the above-described embodiments, it is possible to combine the joint with the wheel hub made of a different material through the screw, it is possible to reduce the volume of the joint. Accordingly, it is possible to not only achieve weight reduction of the wheel bearing, but also strengthen the bonding of dissimilar materials. In addition, a gear tooth is formed at the end of the connecting member coupled to the wheel hub by a screw, and it is designed to increase the diameter of the gear tooth to enhance the driving force transmitted to the joint.

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, 2: wheel bearing assembly, 10: wheel hub, 11: flange portion, 15: wheel bolt hole, 17: screw housing, 20: outer ring, 31, 32: transmission, 41, 42: sealing device, 51: Projection, 60, 210: joint, 70: screw, 90, 220: connecting member, 114: wheel center, 213, 223: groove, 227, 951: gear teeth

Claims (17)

A wheel hub comprising an outer hub portion made of a first material comprising light weight metal and an inner hub portion made of a second material comprising steel material;
A joint coupled with the wheel hub about an axial direction of the wheel hub to contact the inner end of the inner hub portion;
An outer ring spaced apart from each of the wheel hub and the joint;
A rolling device interposed between the wheel hub and the outer ring and between the joint and the outer ring; And
And at least one screw penetrating the wheel hub and the joint in the axial direction to couple the wheel hub and the joint to each other,
A first through hole, a second through hole, and a recess are respectively formed in the outer hub portion, the inner hub portion, and the joint,
The first through hole, the second through hole, and the recess are aligned along the axial direction,
At least a portion of the inner circumferential surface of the recess is formed with a screw thread configured to mesh with the screw thread,
The screw is configured to strengthen the engagement of the inner hub portion and the outer hub portion while engaging a screw thread formed on the inner circumferential surface of the recess,
The joint has a closed end surface that closes the axial inner end of the recess,
The closed cross-section is formed at a position more radially adjacent to the rolling device interposed between the joint and the outer ring compared to the axis of the wheel hub,
Wheel bearing assembly.
According to claim 1,
A wheel bearing assembly is formed in any one of the first through-hole, the second through-hole, and the recess to accommodate the at least one screw.
According to claim 2,
A wheel bearing assembly is formed on at least a portion of the inner circumferential surface of the second through-hole, a screw thread configured to mesh with the screw thread.
delete According to claim 2,
The wheel hub includes a flange portion composed of a portion of the outer hub portion and a portion of the inner hub portion,
A wheel bolt hole is formed in the flange portion, and the screw receiving portion is disposed on a straight line connecting the center of the wheel bolt hole and the axial direction.
The method of claim 5,
The wheel bolt hole and the screw receiving portion are each provided in plural,
The plurality of wheel bolt holes and the plurality of screw accommodating parts are symmetrically arranged to have a constant interval in a circumferential direction surrounding the axial direction, respectively.
According to claim 1,
A part of the inner hub portion is disposed on the outer circumference of the outer hub portion to support a transmission device interposed between the wheel hub and the outer ring, a wheel bearing assembly.
According to claim 2,
The outer hub portion includes a wheel center portion protruding in the axial direction,
The screw receiving portion is formed in a position closer to the axial direction than the wheel center portion, the wheel bearing assembly.
According to claim 1,
The inner hub portion and the outer hub portion are wheel bearing assemblies formed integrally through a semi-melting forging method.
A wheel hub comprising an outer hub portion made of a first material comprising light weight metal and an inner hub portion made of a second material comprising steel material;
A connecting member coupled with the wheel hub about an axial direction of the wheel hub to contact the inner end of the inner hub portion;
An outer ring spaced apart from each of the wheel hub and the connecting member;
A rolling device interposed between the wheel hub and the outer ring and between the connecting member and the outer ring; And
And at least one screw penetrating the wheel hub and the connecting member in the axial direction to couple the wheel hub and the connecting member to each other,
A plurality of gear teeth are formed in the direction perpendicular to the axial direction at the end of the connecting member located on the opposite side of the axial direction with respect to the wheel hub,
The connecting member has a closed end face that closes the axial inner end of the recess,
The closed cross-section is formed at a position more radially adjacent to the rolling device interposed between the joint and the outer ring compared to the axis of the wheel hub,
Wheel bearing assembly.
A wheel hub comprising an outer hub portion made of a first material comprising light weight metal and an inner hub portion made of a second material comprising steel material;
A joint coupled with the wheel hub about an axial direction of the wheel hub to contact the inner end of the inner hub portion;
An inner ring coupled on the outer circumferential surface of the joint;
An outer ring spaced apart from each of the wheel hub and the inner ring;
A plurality of rolling devices interposed between the wheel hub and the outer ring and between the inner ring and the outer ring; And
And at least one screw penetrating the wheel hub and the joint in the axial direction to couple the wheel hub and the joint to each other,
A first through hole, a second through hole, and a recess are respectively formed in the outer hub portion, the inner hub portion, and the joint,
The first through hole, the second through hole, and the recess are aligned along the axial direction,
At least a portion of the inner circumferential surface of the recess is formed with a screw thread configured to mesh with the screw thread,
The screw is configured to strengthen the engagement of the inner hub portion and the outer hub portion while engaging a screw thread formed on the inner circumferential surface of the recess,
The inner ring is press-fit on the outer circumferential surface of the joint to be detachable from the joint by a certain level of external force,
The inner ring is coupled on the outer circumferential surface of the joint in a loose fitting manner,
Wheel bearing assembly.
The method of claim 11,
At least one protrusion is formed at an inner end of the inner ring facing the joint in the axial direction,
The joint is formed with at least one groove for receiving the at least one protrusion, the wheel bearing assembly.
delete delete The method of claim 11,
A wheel bearing assembly is formed in any one of the first through-hole, the second through-hole, and the recess to accommodate the at least one screw.
The method of claim 15,
A wheel bearing assembly in which at least part of the second through hole is formed with a screw thread configured to mesh with the screw thread.
A wheel hub comprising an outer hub portion made of a first material comprising light weight metal and an inner hub portion made of a second material comprising steel material;
A connecting member coupled with the wheel hub about an axial direction of the wheel hub to contact the inner end of the inner hub portion;
An inner ring coupled on the outer circumferential surface of the connecting member;
An outer ring spaced apart from each of the wheel hub and the inner ring;
A plurality of rolling devices interposed between the wheel hub and the outer ring and between the inner ring and the outer ring; And
And at least one screw penetrating the wheel hub and the connecting member in the axial direction to couple the wheel hub and the connecting member to each other,
A plurality of gear teeth are formed in the direction perpendicular to the axial direction at the end of the connecting member located on the opposite side of the axial direction with respect to the wheel hub,
The inner ring is press-fit on the outer circumferential surface of the connecting member so as to be detachable from the connecting member by a certain level of external force,
The inner ring is coupled on the outer peripheral surface of the connecting member in a loose fitting manner,
Wheel bearing assembly.

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