Hub-in-hub constant velocity device

Abstract

Provided is a hub-embedded type constant velocity device including a hub housing having a constant velocity joint coupled inward, an inner race coupled to an outer circumferential surface of the hub housing, and a pre-press ring coupled to the outer circumferential surface of the hub housing and located on one side of the inner race, wherein an end portion of the hub housing is formed to be rolled upward toward the pre-press ring to form a shaped portion coupled to the pre-press ring, the shaped portion being used to apply pressure to the pre-press ring and the inner race.

Description

TECHNICAL FIELD

[0001] The present application relates to a constant velocity apparatus, and more particularly, to a hub-embedded type constant velocity apparatus that combines a torque transmission and a load bearing function by integrating a hub shell and an outer race of a constant velocity apparatus. BACKGROUND

[0002] Generally, a hub and a bearing are installed on a tire wheel connected to a drive shaft, for bearing loads in upward and downward and front and rear directions of a vehicle and a horizontal load when the vehicle turns. Also, a constant velocity apparatus is installed on a drive shaft of a vehicle, and is used to transmit power transmitted from a transmission to a wheel. The constant velocity apparatus, the hub, and the bearing are organized to be assembled together by a fastening member and function as one unit.

[0003] Meanwhile, the constant velocity apparatus is a component that performs transmission of driving force from an engine (a motor) to a wheel, and the constant velocity apparatus and a wheel-side hub bearing are coupled by a spline. However, at the coupling portion between the constant velocity apparatus and the hub bearing, problems such as a joint, a side gap, nut loosening, etc. occur at the time of power transmission.

[0004] The information disclosed in the background section of the present application is only for the purpose of enhancing the understanding of the general background of the present application and should not be considered as admitting that this information constitutes prior art that is already known to those skilled in the art. SUMMARY

[0005] Various aspects of the present application aim to provide a hub-embedded type constant velocity apparatus configured to improve a quality problem between boundary portions and reduce a weight by integrating a hub and an outer race of a constant velocity joint, and configured to improve a hinging angle by reducing a distance between a wheel center and a constant velocity joint center, thereby improving a driving performance.

[0006] According to various exemplary embodiments of the present application, a hub-embedded type constant velocity apparatus includes a hub shell having a constant velocity joint coupled inward, an inner race coupled to an outer peripheral surface of the hub shell, and a pre-press ring coupled to the outer peripheral surface of the hub shell and located on one side of the inner race, wherein an end portion of the hub shell is formed to be rolled upward toward the pre-press ring to form a shaped portion coupled to the pre-press ring, the shaped portion being used to apply a pressure to the pre-press ring and the inner race.

[0007] The hub-embedded type constant velocity apparatus can further include a guard coupled to an outer peripheral surface of the pre-press ring, wherein a coupling structure can be formed on each of the outer peripheral surface of the pre-press ring and an inner peripheral surface portion of the guard coupled to the pre-press ring.

[0008] A plurality of teeth can be formed on an inner circumferential surface of the pre-press ring to prevent the pre-press ring from rotating on an outer circumferential surface of the hub case.

[0009] The guard can be received on an outer circumferential surface of the pre-press ring and an upper end of the shaped portion, and a sealing portion can be formed inside the guard in at least one of a direction of one surface of the shaped portion and a direction of a surface where the pre-press ring and the shaped portion contact each other.

[0010] The sealing portion can include a first sealing portion extending in an axial direction of the pre-press ring from a surface of the guard that is adjacent to a side surface of the shaped portion and formed to be adjacent to the side surface of the shaped portion, and a second sealing portion formed inward from an inside of the guard and extending in a direction of a surface where the pre-press ring and the shaped portion contact each other.

[0011] A first seat and a second seat can be provided on an outer circumferential surface of the hub case, the inner race is received on the first seat, the pre-press ring is received on the second seat, and a step can be formed between the first seat and the second seat.

[0012] A step can be formed in a portion of the pre-press ring that contacts the inner race, and the step formed in the pre-press ring can correspond to the step formed between the first seat and the second seat.

[0013] A low-friction washer can be provided between the inner race and the pre-press ring.

[0014] The low-friction washer can be fixed to the pre-press ring.

[0015] A low-friction structure for reducing friction with the inner race can be formed on a surface of the pre-press ring that is adjacent to the inner race.

[0016] The inner race and the pre-press ring can be formed of different materials.

[0017] A value obtained by dividing an outermost diameter of the pre-press ring by an outer diameter of the shaped portion can be 0.8 to 1.2.

[0018] A value obtained by dividing a thickness of the pre-press ring by a thickness of the shaped portion can be 1.2 to 1.6.

[0019] A value obtained by dividing an inner diameter of the pre-press ring by a total length of the pre-press ring can be 5 to 7.

[0020] A value obtained by dividing an outer diameter of the shaped portion by an inner diameter of the pre-press ring can be 1.1 to 1.4.

[0021] The accompanying drawings, which are incorporated herein by reference, and the detailed description that follows, further serve to illustrate certain principles of the present application. Figure One By way of illustration, certain principles of the present application will be described with reference to various exemplary embodiments of the method and apparatus of the present application, some of which are illustrated in the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a view exemplarily showing the overall configuration of a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application.

[0023] Figure 2 is a view exemplarily showing the press forming of an inner race and a pre-press ring at a shaped portion of a hub shell in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application.

[0024] Figure 3 is a view exemplarily showing a coupling structure formed on an outer peripheral surface of a pre-press ring in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application.

[0025] Figure 4 is a view exemplarily showing a plurality of teeth formed on an inner peripheral surface of a pre-press ring in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application.

[0026] Figure 5 is a view exemplarily showing a seal portion formed at a guard in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application.

[0027] Figure 6 is a view exemplarily showing a state in which an inner race and a pre-press ring are accommodated in first and second seat portions of a hub shell in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application.

[0028] Figure 7 is a view exemplarily showing a step structure formed at first and second seat portions in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application, in which ΦD1 is the diameter of the first seat portion; and ΦD2 is the diameter of the second seat portion.

[0029] Figure 8 is a view exemplarily showing a low-friction washer fixed to a pre-press ring by a clamping method in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application.

[0030] Figure 9is a view exemplarily illustrating a low friction washer fixed to a pre-press ring by an adhesive in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application.

[0031] Figure 10 is a view exemplarily illustrating a step structure formed at a pre-press ring in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application.

[0032] Figure 11 is a view exemplarily illustrating a low friction structure formed on a surface of a pre-press ring adjacent to an inner race in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application.

[0033] Figure 12 is a view exemplarily illustrating a low friction structure formed on a surface of a pre-press ring adjacent to an inner race in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application.

[0034] Figure 13 is a view exemplarily illustrating a numerical relationship between each component in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application.

[0035] It is to be understood that the figures are not drawn to scale and that the drawings are schematic representations illustrating the basic concepts of the present application. The specific design features of the present application disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the specific environment in which the present application is applied and used.

[0036] In these drawings, like reference numerals indicate like or equivalent parts throughout the several views of the drawings. DETAILED DESCRIPTION

[0037] Reference will now be made in detail to various embodiments of the present application, examples of which are illustrated in the accompanying drawings and described below. While the present application will be described in conjunction with the exemplary embodiments, it should be understood that the present application is not limited to those exemplary embodiments. On the contrary, the present application is intended to cover various alternatives, modifications, equivalents and other embodiments, which can be included within the spirit and scope of the present application as defined by the appended claims.

[0038] Hereinafter, a hub-enclosed type constant velocity apparatus according to exemplary embodiments of the present application will be described with reference to the accompanying drawings.

[0039] Figure 1 is a view exemplarily illustrating a low friction washer fixed to a pre-press ring by an adhesive in a hub-enclosed type constant velocity apparatus according to various exemplary embodiments of the present application. Figure 2is a view exemplarily illustrating a state in which an inner race and a pre-press ring are accommodated in a first seating portion and a second seating portion of a hub housing in a hub- built type constant velocity apparatus according to various exemplary embodiments of the present application, Figure 3 is a view exemplarily illustrating a coupling structure formed on an outer peripheral surface of a pre-press ring in a hub-built type constant velocity apparatus according to various exemplary embodiments of the present application, Figure 4 is a view exemplarily illustrating a plurality of teeth formed on an inner peripheral surface of a pre-press ring in a hub-built type constant velocity apparatus according to various exemplary embodiments of the present application, Figure 5 is a view exemplarily illustrating a sealing portion formed at a guard in a hub-built type constant velocity apparatus according to various exemplary embodiments of the present application, Figure 6 is a view exemplarily illustrating a state in which an inner race and a pre-press ring are accommodated in a first seating portion and a second seating portion of a hub housing in a hub-built type constant velocity apparatus according to various exemplary embodiments of the present application, Figure 7 is a view exemplarily illustrating a step structure formed at a first seating portion and a second seating portion in a hub-built type constant velocity apparatus according to various exemplary embodiments of the present application, Figure 8 is a view exemplarily illustrating a low-friction washer fixed to a pre-press ring by a clamping method in a hub-built type constant velocity apparatus according to various exemplary embodiments of the present application, Figure 9 is a view exemplarily illustrating a low-friction washer fixed to a pre-press ring by an adhesive in a hub-built type constant velocity apparatus according to various exemplary embodiments of the present application, Figure 10 is a view exemplarily illustrating a step structure formed at a pre-press ring in a hub-built type constant velocity apparatus according to various exemplary embodiments of the present application, Figure 11 is a view exemplarily illustrating a low-friction structure formed on a surface of a pre-press ring adjacent to an inner race in a hub-built type constant velocity apparatus according to various exemplary embodiments of the present application, Figure 12 is a view exemplarily illustrating a low-friction structure formed on a surface of a pre-press ring adjacent to an inner race in a hub-built type constant velocity apparatus according to various exemplary embodiments of the present application, Figure 13 is a view exemplarily illustrating a numerical relationship between each component in a hub-built type constant velocity apparatus according to various exemplary embodiments of the present application.

[0040] As Figure 1As shown, a hub-integrated constant velocity device according to various exemplary embodiments of the present invention may include one or more hub housings 100, inner seat rings 200, outer seat rings 600, pre-load rings 300, constant velocity joints 400, boots 500, wheel bearings 700, sealing devices 800, hub caps 900, and wheel guides 910.

[0041] The wheel hub housing 100, which integrates the wheel hub and the outer race of the constant velocity joint 400, is provided with a constant velocity joint 400 connected to its interior to transmit the drive torque from the engine to the wheel. Simultaneously, the wheel hub housing 100 can also serve as the inner race of the wheel bearing 700 to support the vehicle's load.

[0042] Therefore, by integrating the wheel hub and the outer seat ring of the constant velocity joint 400 to form the hub housing 100, the central portion of the constant velocity joint 400 can be moved to the outside of the vehicle, thereby increasing the length of the drive shaft. As a result, the hinge angle of the drive shaft of the constant velocity joint 400 can be improved.

[0043] Furthermore, by integrating the wheel hub and the outer ring of the constant velocity joint 400 to form the hub housing 100, the connecting components between the wheel hub and the constant velocity joint in related technologies can be eliminated, thereby reducing weight and manufacturing costs. The weight reduction improves driving fuel efficiency, reduces noise problems caused by connecting components, and improves quality problems caused by loose wheel hub nuts that fix the constant velocity joint housing and the wheel hub.

[0044] like Figure 2 As shown, the hub housing 100 may have a forming portion 130, which is disposed at one end and rolled upward toward the preload ring 300 to apply pressure to the preload ring 300 and the inner race 200, which are connected to the outer peripheral surface of the hub housing 100. Here, the forming portion 130 can be formed by an orbital forming method. Preload can be applied to the inner race 200 of the wheel bearing 700 by the forming portion 130 provided in the hub housing 100. Here, the magnitude of the preload can be set such that, based on the magnitude of the preload, some components constituting the wheel bearing assembly are compressed and elastically deformed by a predetermined force applied axially during assembly.

[0045] The inner race 200 can be press-fitted to the outer peripheral surface of the hub housing 100 and can rotate together with the hub housing 100. In addition, the inner race 200 is constructed as the inner track of the wheel bearing 700.

[0046] The outer race 600 may be spaced apart from the hub housing 100 and the inner race 200, and is configured as the outer track of the wheel bearing 700. Furthermore, the outer race 600 is coupled to the steering knuckle 920. Since the outer race 600 is coupled to the steering knuckle 920, the outer race 600 can be a non-rotating element that does not move in position.

[0047] like Figure 1 As shown, the first rolling element 710 and the second rolling element 720 can be located between the hub housing 100 and the outer race 600, and between the outer race 600 and the inner race 200. According to an exemplary embodiment, the first rolling element 710 and the second rolling element 720 can be balls or rollers, and can rotate on the outer peripheral surfaces of the outer race 600 and the hub housing 100, as well as on the track portions of the outer race 600 and the inner race 200.

[0048] The sealing device 800 is configured to prevent foreign objects from entering the wheel bearing 700 and to prevent internal grease leakage.

[0049] The hub cap 900 is configured to prevent grease leakage from the constant velocity joint 400 and to prevent foreign matter from entering the constant velocity joint 400.

[0050] The wheel guide 910 is configured as an assembly guide for the wheel and disc, and is configured to maintain the central position of the rotating body.

[0051] The constant velocity joint 400 is configured to transmit the driving force transmitted through the engine and transmission to the wheel hub housing 100.

[0052] The protective cover 500 is configured to prevent grease from leaking into the constant velocity joint 400 and to prevent foreign matter from entering the constant velocity joint 400.

[0053] In the following description, the structure of the preload ring 300, which is a core feature of the present invention, the structure of the outer peripheral surface of the hub housing 100 on which the preload ring 300 is housed, and the structure of the protective cover 500 connected to the preload ring 300 will be described in more detail.

[0054] like Figure 2 As shown, the preload ring 300 can be connected to the outer peripheral surface of the hub housing 100 and can be located on one side of the inner bearing ring 200. Here, the preload ring 300 can be connected to the outer peripheral surface of the hub housing 100 through assembly, press fitting, etc.

[0055] The protective cover 500 can be coupled to the outer peripheral surface of the preload ring 300, and a coupling structure for coupling with the protective cover 500 can be formed on the outer peripheral surface of the preload ring 300. Similarly, a coupling structure can also be formed on the inner peripheral surface portion of the protective cover 500 coupled to the preload ring 300. Various exemplary embodiments of the invention, such as...Figure 3 As shown, a protrusion 320 can be formed on the outer circumferential surface of the pre-press ring 300 along the outer circumferential surface, and a recess corresponding to the shape of the protrusion can be provided on the inner circumferential surface of the guard cover 500. According to another exemplary embodiment of the present application, a recess can be formed on the outer circumferential surface of the pre-press ring 300, and a protrusion corresponding to the shape of the recess can be formed on the inner surface of the guard cover 500 corresponding to the recess formed on the outer circumferential surface of the pre-press ring 300. However, this is only various exemplary embodiments of the present application, and the shape of the coupling structure formed on the outer circumferential surface of the pre-press ring 300 and the inner circumferential surface portion of the guard cover 500 coupled to the pre-press ring 300 is not limited thereto.

[0056] Referring to Figure 4 A plurality of teeth 330 can be formed on the inner circumferential surface of the pre-press ring 300 to prevent the pre-press ring 300 from rotating on the outer circumferential surface of the hub housing 100. According to various exemplary embodiments of the present application, a sawtooth can be provided on the inner circumferential surface of the pre-press ring 300, which is configured to prevent the pre-press ring 300 from rotating on the outer circumferential surface of the hub housing 100.

[0057] If the pre-press ring 300 coupled to the outer circumferential surface of the hub housing 100 rotates, the guard cover 500 coupled to the upper end portion of the pre-press ring 300 can be deformed, and as the guard cover 500 is deformed, the sealing performance of the guard cover 500 can be reduced, causing the possibility that the grease or the like contained in the constant velocity joint 400 can leak. To prevent such a problem, in various exemplary embodiments of the present application, a plurality of teeth can be provided on the inner circumferential surface of the pre-press ring 300 so that the pre-press ring 300 can be stably fixed to the outer circumferential surface of the hub housing 100 and prevented from rotating, so that deformation of the guard cover 500 and the resulting grease leakage can be improved.

[0058] Referring to Figure 5 The guard cover 500 is received on the outer circumferential surface of the pre-press ring 300 and the upper end portion of the shaped portion 130. The sealing portions 510 and 520 can be formed in at least one of the direction of one surface of the shaped portion 130 and the direction in which the pre-press ring 300 and the shaped portion 130 contact each other.

[0059] The sealing portion can include a first sealing portion 510 extending from a surface adjacent to one surface of the shaped portion 130 inside the guard cover 500 in the axial direction of the pre-press ring to abut the one surface of the shaped portion 130, and a second sealing portion 520 formed in the radial direction from the inside of the guard cover 500 and extending in the surface direction in which the pre-press ring 300 and the shaped portion 130 contact each other.

[0060] For example, when a load having a predetermined size or a larger load including a torque, an axial load, and a lateral force is applied to the hub shell 100, the sealing performance of the shaped portion 130 can be reduced, and if the sealing performance of the shaped portion 130 is reduced, the grease accommodated in the boot 500 can penetrate between the shaped portion 130 and the pre-press ring 300, as a result, the rotation of the pre-press ring 300 can be facilitated to cause the deformation of the boot 500, and thus the leakage of the grease accommodated in the boot 500.

[0061] To solve the above problem, in various exemplary embodiments of the present application, a first sealing portion 510 extending in an axial direction from a surface of the inside of the boot 500 abutting one surface of the shaped portion 130 to abut one surface of the shaped portion 130 and a second sealing portion 520 extending in a direction in which the pre-press ring 300 and the surface of the shaped portion 130 contacting each other are provided.

[0062] As described above, in various exemplary embodiments of the present application, since the first sealing portion 510 and the second sealing portion 520 are provided in the inside of the boot 500, even if a load having a predetermined size or a larger load is applied to the hub shell 100 to reduce the sealing performance of the shaped portion 130, the leakage of the grease in the boot 500 can be prevented mainly by the first sealing portion 510, and even if the grease penetrates through the first sealing portion 510, the penetration of the grease to the pre-press ring 300 through the second sealing portion 520 can be prevented.

[0063] Meanwhile, the first seating portion 110 and the second seating portion 120 can be provided on the outer circumferential surface of the hub shell 100, the inner race 200 is accommodated on the first seating portion 110, and the pre-press ring 300 is accommodated on the second seating portion 120. Referring to Figure 6 and Figure 7 A step 140 can be formed between the first seating portion 110 and the second seating portion 120. As Figure 7 indicated, the diameter of the first seating portion 110 is preferably greater than the diameter of the second seating portion 120.

[0064] Here, the reason for forming the step 140 between the first seating portion 110 and the second seating portion 120 by making the diameter of the first seating portion 110 greater than the diameter of the second seating portion 120 is to make the fitting force of the pre-press ring 300 greater than the fitting force of the inner race 200 when the inner race 200 and the pre-press ring 300 are press-fitted and installed to the outer circumferential surface of the hub shell 100.

[0065] When the inner race 200 is press-fitted and mounted to the outer circumferential surface of the hub shell 100, if the fitting force is greater than a predetermined level, the groove formed in the hub shell 100 can be excessively deformed. That is, if the press-fitting is performed by applying the fitting force of press-fitting the pre-press ring 300 to the outer circumferential surface of the hub shell 100 to the inner race 200, the groove formed in the hub shell 100 can be excessively deformed.

[0066] To solve this problem, in various exemplary embodiments of the present application, a step 140 is provided between the first seat 110 on which the inner race 200 is accommodated and the second seat 120 on which the pre-press ring 300 is accommodated, and thus different fitting forces can be applied to the inner race 200 and the pre-press ring 300, respectively.

[0067] Meanwhile, referring to Figure 10 , the pre-press ring 300 can have a step 310 in a portion in contact with the inner race 200. Here, the step 310 formed on the pre-press ring 300 can correspond to the step 140 formed between the first seat 110 and the second seat 120.

[0068] Here, the reason for forming the step 310 in the portion of the pre-press ring 300 in contact with the inner race 200 is to balance the reaction force based on the press-fitting of the inner race 200 to the hub shell 100 and the forming force based on the forming of the end portion of the hub shell.

[0069] If the forming force when the end portion of the hub shell 100 is formed is greater than the reaction force based on the inner race 200, there is a problem that the inner race 200 is deformed and cracks can occur in the inner race 200. To improve this problem, in various exemplary embodiments of the present application, by forming the step 310 in the portion of the pre-press ring 300 in contact with the inner race 200, the reaction force based on the inner race 200 and the forming force at the time of forming can be balanced in the axial direction thereof.

[0070] Meanwhile, to prevent the rotation of the pre-press ring 300 caused by the load rotation force of the inner race 200, it is necessary to reduce the frictional force between the inner race 200 and the pre-press ring 300. In various exemplary embodiments of the present application, to reduce the frictional force between the inner race 200 and the pre-press ring 300, a low-friction washer 930 can be located between the inner race 200 and the pre-press ring 300. Here, according to various exemplary embodiments of the present application, the low-friction washer 930 can be fixed to the pre-press ring 300, here, as shown in Figure 8 , the low-friction washer 930 can be fixed to the pre-press ring 300 by a clamping method, or according to another exemplary embodiment of the present application, as shown in Figure 9 , the low-friction washer 930 can be fixed to the pre-press ring 300 by an adhesive method with an adhesive or the like.

[0071] Meanwhile, a low friction structure 340 for reducing friction with the inner race 200 can be provided on a surface of the pre-press ring 300 that is adjacent to the inner race 200. According to various exemplary embodiments of the present application, as shown in Figure 11 a positive protrusion 340 can be formed on a surface of the pre-press ring 300 that is adjacent to the inner race 200 to reduce a friction area in contact with the inner race 200, thereby reducing friction between the inner race 200 and the pre-press ring 300. Further, according to another exemplary embodiment of the present application, as shown in Figure 12 a negative protrusion 340 can be formed on a surface of the pre-press ring 300 that is adjacent to the inner race 200 to reduce a friction area in contact with the inner race 200, thereby reducing friction between the inner race 200 and the pre-press ring 300.

[0072] Meanwhile, in various exemplary embodiments of the present application, the inner race 200 and the pre-press ring 300 can be formed of different materials. According to various exemplary embodiments of the present application, the inner race 200 can be formed of SUJ2 steel, and the pre-press ring 300 can be formed of S45C steel. However, this is merely an example, and the materials of the inner race 200 and the pre-press ring 300 are not limited thereto.

[0073] Referring to Figure 13 In the hub-encased type constant velocity apparatus 400 according to various exemplary embodiments of the present application, in order to the assemblability of the guard 500 and the sealing performance of the guard 500, a value obtained by dividing the outer diameter of the pre-press ring 300 by the outer diameter of the shaped portion 130 can be 0.8 to 1.2.

[0074] Here, if the value obtained by dividing the outer diameter of the pre-press ring 300 by the outer diameter of the shaped portion 130 is less than 0.8 or greater than 1.2, a difference between the top of the pre-press ring 300 and the top of the shaped portion 130 can increase by a predetermined interval or more, and in this case, the assemblability of the guard 500 to be installed to the top of the pre-press ring 300 and the top of the shaped portion 130 can decrease, and since the guard 500 is not firmly installed, the sealing performance of the guard 500 can decrease.

[0075] Further, in the hub-encased type constant velocity apparatus 400 according to various exemplary embodiments of the present application, in order to prevent deformation of the inner race 200 and generation of a crack on the inner race 200, a value obtained by dividing the thickness of the pre-press ring 300 by the thickness of the shaped portion 130 can be 1.2 to 1.6.

[0076] Further, in order to optimally maintain the pre-pressure applied to the inner race 200, a value obtained by dividing the inner diameter of the pre-press ring 300 by the total length of the pre-press ring 300 can be 5 to 7, and a value obtained by dividing the outer diameter of the shaped portion 130 by the inner diameter of the pre-press ring 300 can be 1.1 to 1.4.

[0077] According to various exemplary embodiments of the present application, by integrating the hub housing and the outer race of the constant velocity joint, it is possible to improve a noise problem generated between the boundary portions when moving forward and backward, it is possible to improve a hub nut engagement problem, and by reducing the number of components, it is possible to reduce the weight and improve the driving range.

[0078] Further, by improving the articulation angle by reducing the distance between the wheel center portion and the constant velocity joint center portion, it is possible to improve the driving performance.

[0079] For the convenience of explanation and precise definition of the appended claims, the terms "above", "below", "inner", "outer", "upper", "lower", "upward", "downward", "front", "rear", "back", "inboard", "outboard", "inward", "outward", "interior", "exterior", "forward", and "rearward" are used to describe the features of the exemplary embodiments with reference to the positions of these features shown in the drawings. It will be further understood that the term "connected" or its derivatives refer to direct and indirect connections.

[0080] The foregoing presentation of the description of specific exemplary embodiments of the present application is for illustrative and descriptive purposes. The foregoing description is not intended to be exhaustive or to be limited to the precise form disclosed and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain the principles of the application and its practical application and to enable others skilled in the art to implement and utilize the various exemplary embodiments of the present application, as well as various alternatives and modifications thereof. It is intended that the scope of the application be defined by the following claims and their equivalents.

Claims

1. A hub-in-hub type constant velocity apparatus comprising: a hub housing having a constant velocity joint coupled inside thereof; an inner race coupled to an outer circumferential surface of the hub housing; and a pre-press ring coupled to the outer circumferential surface of the hub housing and positioned on one side of the inner race, wherein an end portion of the hub housing is formed to be rolled upward toward the pre-press ring to form a shaped portion coupled to the pre-press ring, the shaped portion for applying pressure to the pre-press ring and the inner race, and a gasket is provided between the inner race and the pre-press ring. 2.The hub-in-hub type constant velocity apparatus according to claim 1, further comprising: a guard coupled to an outer circumferential surface of the pre-press ring, wherein a coupling structure is formed on each of the outer circumferential surface of the pre-press ring and the guard and an inner circumferential surface portion of the pre-press ring to which the guard is coupled. A plurality of teeth are formed on an inner circumferential surface of the pre-press ring to prevent the pre-press ring from rotating on an outer circumferential surface of the hub housing.

3. The hub-integrated type constant velocity apparatus according to claim 1, wherein 4.The hub-in-hub type constant velocity apparatus according to claim 2, the guard is accommodated on the outer circumferential surface of the pre-press ring and an upper end portion of the shaped portion. wherein 5.The hub-in-hub type constant velocity apparatus according to claim 4, a seal portion is formed in at least one of a direction of one surface of the shaped portion and a direction of a surface at which the pre-press ring and the shaped portion contact each other in an inner portion of the guard. wherein The seal portion includes:

6. The hub-integrated type constant velocity apparatus according to claim 5, wherein a first seal portion extending in an axial direction of the pre-press ring from a surface of the guard adjacent to a side surface of the shaped portion in an inner portion of the guard and formed to be adjacent to the side surface of the shaped portion; and a second seal portion formed inward from the inner portion of the guard and extending in the direction of the surface at which the pre-press ring and the shaped portion contact each other. 7.The hub-in-hub type constant velocity apparatus according to claim 1, a first seat portion on which the inner race is accommodated and a second seat portion on which the pre-press ring is accommodated are provided on an outer circumferential surface of the hub housing, wherein a step is formed between the first seat portion and the second seat portion. 8.The hub-in-hub type constant velocity apparatus according to claim 7, a step is formed in a portion of the pre-press ring that contacts the inner race, wherein, the step formed in the pre-press ring corresponds to the step formed between the first seat portion and the second seat portion. The gasket is fixed to the pre-press ring.

9. The hub-integrated type constant velocity apparatus according to claim 1, wherein, The inner race and the pre-press ring are formed of different materials.

10. The hub-integrated type constant velocity apparatus according to claim 1, wherein, A value obtained by dividing an outermost diameter of the pre-press ring by an outer diameter of the shaped portion is 0.8 to 1.

2.

11. The hub-integrated type constant velocity apparatus according to claim 1, wherein A value obtained by dividing a thickness of the pre-press ring by a thickness of the shaped portion is 1.2 to 1.

6.

12. The hub-integrated type constant velocity apparatus according to claim 1, wherein, A value obtained by dividing an inner diameter of the pre-press ring by a total length of the pre-press ring is 5 to 7.

13. The hub-integrated type constant velocity apparatus according to claim 1, wherein, A value obtained by dividing an outer diameter of the shaped portion by an inner diameter of the pre-press ring is 1.1 to 1.

4.

14. The hub-integrated type constant velocity apparatus according to claim 1, wherein, A protrusion is formed on an outer circumferential surface of the pre-press ring or on an inner surface of the guard along the outer circumferential surface of the pre-press ring.

15. The hub-integrated type constant velocity apparatus according to claim 2, wherein 16.A hub-in-hub type constant velocity apparatus comprising: ​ A hub housing having a constant velocity joint coupled inside; An inner race coupled to an outer circumferential surface of the hub housing; and A pre-press ring coupled to an outer circumferential surface of the hub housing and located on one side of the inner race, wherein an end portion of the hub housing is formed to be rolled upward toward the pre-press ring to form a shaped portion coupled to the pre-press ring, the shaped portion for applying pressure to the pre-press ring and the inner race, a low friction structure is provided on a surface of the pre-press ring adjacent to the inner race, the low friction structure for reducing frictional force with the inner race.

17. The hub-integrated type constant velocity apparatus according to claim 16, wherein, The low friction structure includes a male protrusion formed on a surface of the pre-press ring adjacent to the inner race to reduce a friction area in contact with the inner race.

18. The hub-integrated type constant velocity apparatus according to claim 16, wherein, The low friction structure includes a female protrusion formed on a surface of the pre-press ring adjacent to the inner race.

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