Differential and vehicle including differential

Abstract

The invention relates to a differential and a vehicle including the same. A vehicle may include a first differential configured to allow a speed difference between left and right wheels of a main drive shaft; a first limited slip differential configured to selectively limit differential operation of the first differential; a second differential configured to allow a speed difference between left and right wheels of the auxiliary drive shaft; a second limited slip differential configured to selectively limit differential operation of the second differential; and a disconnecting device disposed on the auxiliary drive shaft and configured to selectively block power transmitted from the drive source to the auxiliary drive shaft.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10 - 2023 - 0197134, filed on December 29, 2023, the entire contents of which are incorporated herein for all purposes by this reference. Technical field

[0003] This application relates to a vehicle, and more particularly, to a vehicle having an electronic limited - slip differential provided on a main drive shaft and an auxiliary drive shaft. Background art

[0004] Generally, a limited - slip differential (LSD) is provided on a drive shaft of a vehicle, and the limited - slip differential restricts the differential operation performed by the differential. The limited - slip differential can restrict the differential operation performed by the differential by adjusting the pressure applied to a clutch.

[0005] Generally, the limited - slip differential is only installed on the main drive wheels. Recently, research has been conducted on applying the limited - slip differential to the auxiliary drive shaft to improve the driving performance of the vehicle.

[0006] Recently, a disconnecting device has been applied to the auxiliary drive shaft to improve the power economy of an electric vehicle. The disconnecting device can improve the power economy of the vehicle by blocking the power transmitted from the drive source to the auxiliary drive shaft.

[0007] However, due to interference between components, it is difficult to install the disconnecting device and the limited - slip differential on the auxiliary drive shaft.

[0008] The information included in the background of this application is only intended to enhance the understanding of the overall background of this application and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the invention

[0009] Aspects of the present application are directed to providing a vehicle in which limited - slip differentials are respectively provided on a main drive shaft and an auxiliary drive shaft.

[0010] A vehicle according to various exemplary embodiments of the present application may include: a first differential configured to allow a speed difference between a left wheel and a right wheel of a main drive shaft; a first limited - slip differential configured to selectively restrict the differential operation of the first differential; a second differential configured to allow a speed difference between a left wheel and a right wheel of an auxiliary drive shaft; a second limited - slip differential configured to selectively restrict the differential operation of the second differential; and a disconnecting device provided on the auxiliary drive shaft and configured to selectively block the power transmitted from the drive source to the auxiliary drive shaft.

[0011] In several exemplary embodiments of the present application, the first differential may include: a first ring gear; a first differential housing connected to the first ring gear and rotating integrally with the first ring gear; a first planetary gear rotatably mounted in the first differential housing and rotating about its own axis and revolving around the main drive shaft; and a pair of first side gear rotatably mounted on the main drive shaft and meshing with the first planetary gear.

[0012] In several exemplary embodiments of the present application, the first limited-slip differential may include: a first hub clutch engaged with the main drive shaft and configured to rotate integrally with the main drive shaft; a first friction plate engaged with the first hub clutch; a first clutch drum engaged with the first differential housing and configured to rotate integrally with the first differential housing; and a first metal plate engaged with the first clutch drum.

[0013] In several exemplary embodiments of the present application, the main drive shaft and the first hub clutch may be splined to each other.

[0014] In several exemplary embodiments of the present application, the first differential housing and the first clutch drum may be splined to each other.

[0015] In several exemplary embodiments of the present application, the second differential may include: a second ring gear; a second differential housing configured to rotate integrally with the second ring gear; an auxiliary differential housing configured to be selectively engaged with the second differential housing through a disconnecting device; a second planetary gear disposed in the auxiliary differential housing and rotating about its own axis and revolving around the auxiliary drive shaft; and a second side gear meshing with the second planetary gear.

[0016] In several exemplary embodiments of the present application, the auxiliary differential housing may be disposed within the second differential housing.

[0017] In several exemplary embodiments of the present application, the second limited-slip differential may include: a second hub clutch engaged with the auxiliary drive shaft and configured to rotate integrally with the auxiliary drive shaft; a second friction plate engaged with the second hub clutch; a second clutch drum engaged with the second differential housing and configured to rotate integrally with the second differential housing; and a second metal plate engaged with the second clutch drum.

[0018] In several exemplary embodiments of the present application, the disconnecting device may separate or engage the second differential housing from the auxiliary differential housing.

[0019] A differential according to another exemplary embodiment of the present application may include: a ring gear; a differential housing configured to rotate integrally with the ring gear; an auxiliary differential housing selectively engaged with the differential housing; a planetary gear disposed in the auxiliary differential housing and configured to rotate about its own axis and revolve around a drive shaft; and a side gear meshing with the planetary gear.

[0020] In several exemplary embodiments of the present application, the auxiliary differential housing may be disposed within the differential housing.

[0021] In several exemplary embodiments of the present application, the differential housing may be engaged with one side of a limited-slip differential, and the drive shaft may be engaged with the other side of the limited-slip differential.

[0022] In several exemplary embodiments of the present application, the differential housing may be engaged with a clutch drum of a limited-slip differential, and the drive shaft may be engaged with a hub clutch of the limited-slip differential.

[0023] In several exemplary embodiments of the present application, the differential housing and the auxiliary differential housing may be separated or engaged by a disconnecting device.

[0024] According to an exemplary embodiment of the present application, electronic limited-slip differentials may be respectively disposed on a main drive shaft and an auxiliary drive shaft, thereby improving the traction driving performance and turning driving performance of a vehicle.

[0025] In addition, the effects that can be obtained or expected through the exemplary embodiments of the present application will be directly or implicitly included in the detailed description of the present application. That is, a detailed description of various effects expected according to the exemplary embodiments of the present application will be included in the following description.

[0026] The methods and apparatuses of the present application have other characteristics and advantages that will be apparent from or will be described in more detail in the accompanying drawings and the following detailed description incorporated herein, and these accompanying drawings and the following detailed description together are used to explain the specific principles of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Since the accompanying drawings are provided for reference to describe the exemplary embodiments of the present application, the technical spirit of the present application should not be construed as being limited to the accompanying drawings.

[0028] Figure 1 is a conceptual diagram schematically showing the configuration of a vehicle according to an exemplary embodiment of the present application.

[0029] Figure 2is a conceptual diagram schematically showing the configuration of a differential and a limited-slip differential provided on a main drive shaft according to an exemplary embodiment of the present application.

[0030] Figure 3 , Figure 4 , Figure 5 and Figure 6 is a conceptual diagram schematically showing the configuration of a differential, a limited-slip differential, and a disconnecting device provided on an auxiliary drive shaft according to an exemplary embodiment of the present application.

[0031] It should be understood that the accompanying drawings are not drawn to scale and they present a suitably simplified representation of the various features of the basic principles of the present application. The predetermined design features included in the present application, for example, including specific dimensions, orientations, positions, and shapes, will be determined in part by the particular intended application and the use environment.

[0032] In the drawings, throughout several views of the drawings, reference numerals refer to the same or equivalent parts of the present application. Detailed Description

[0033] Reference will now be made in detail to the various embodiments of the present application, examples of the various embodiments are illustrated in the drawings and described as follows. Although the present application will be described in conjunction with the exemplary embodiments of the present application, it should be understood that this specification is not intended to limit the present application to those exemplary embodiments. On the other hand, the present application is intended to cover not only the exemplary embodiments of the present application, but also various alternative embodiments, modified embodiments, equivalent embodiments, or other embodiments that may be included within the spirit and scope of the present application as defined by the appended claims.

[0034] The terms used herein are only for describing the predetermined embodiments and are not intended to limit the present application. As used herein, the singular forms are also intended to include the plural forms unless the context clearly dictates otherwise. It should be understood that the terms "comprising (including)" and / or "including (comprising)" used in this specification indicate the presence of features, values, steps, operations, components, and / or assemblies, but do not preclude the presence or addition of one or more other features, values, steps, operations, components, assemblies, and / or combinations thereof. As used herein, the term "and / or" includes any one or all combinations of the related listed items.

[0035] The present application will be described in detail with reference to the drawings so that those of ordinary skill in the art in the field to which the present application pertains can easily implement the embodiments. However, the present application can be implemented in various different ways and is not limited to the embodiments described herein.

[0036] Portions unrelated to the description will be omitted to clearly describe the content of the present application, and the same or similar components will be denoted by the same reference numerals throughout the specification.

[0037] In addition, for ease of description, the dimensions and thicknesses of each component shown in the drawings are arbitrarily represented, but the present application is not limited thereto. To clearly describe several parts and regions, the thickness thereof is enlarged.

[0038] In the following description, the suffixes “module”, “unit”, “component” and / or “part” used to describe components will be used together or interchangeably for ease of description, but the suffixes themselves do not have distinguishable meanings or functions.

[0039] In addition, in the description of the included embodiments, when it is determined that a specific description of the related art may obscure the subject matter of the exemplary embodiments included in the present specification, the specific description will be omitted.

[0040] In addition, it should be construed that the drawings are provided only to enable those skilled in the art to easily understand the exemplary embodiments included in the present specification, and the technical spirit included in the present specification is not limited by the drawings and includes all modifications, equivalents and alternatives included in the spirit and technical scope of the present application.

[0041] Terms including ordinal numbers such as “first”, “second” and the like may be used to describe various components, but the components are not limited by these terms.

[0042] In the following description, the singular expressions “a” or “an” may be construed as singular or plural expressions unless explicitly stated.

[0043] These terms are only used to distinguish one component from another.

[0044] Hereinafter, a vehicle according to an exemplary embodiment will be described in detail with reference to the drawings.

[0045] Figure 1 is a conceptual diagram schematically showing the configuration of a vehicle according to an exemplary embodiment of the present application.

[0046] As Figure 1As shown, a vehicle according to an exemplary embodiment of the present application may include a first differential 140, a first limited-slip differential 150, a second differential 240, a second limited-slip differential 250, and a disconnecting device 260; the first differential 140 is disposed on the main drive shaft 110 and configured to allow a speed difference between the left and right wheels of the main drive shaft 110; the first limited-slip differential 150 is configured to selectively limit the differential operation of the first differential 140; the second differential 240 is configured to allow a speed difference between the left and right wheels of the auxiliary drive shaft 210; the second limited-slip differential 250 is configured to selectively limit the differential operation of the second differential 240; the disconnecting device 260 is disposed on the auxiliary drive shaft 210 and configured to selectively block the power transmitted from the drive source to the auxiliary drive shaft 210.

[0047] First, the first differential 140 and the first limited-slip differential 150 disposed on the main drive shaft 110 will be described in detail with reference to the accompanying drawings.

[0048] Figure 2 is a conceptual diagram schematically showing the configuration of a differential and a limited-slip differential disposed on the main drive shaft according to an exemplary embodiment of the present application.

[0049] Reference Figure 2 , the first differential 140 and the first limited-slip differential 150 may be disposed on the main drive shaft 110.

[0050] The first differential 140 may distribute the power transmitted from the first drive source 120 to the left and right wheels of the main drive shaft 110 through the first reduction gear 130. In an exemplary embodiment of the present application, the main drive shaft 110 may be a rear-wheel drive shaft.

[0051] The first drive source 120 may generate the power required to drive the vehicle. The first drive source 120 may be an electric motor or an engine.

[0052] The power generated by the first drive source 120 may be transmitted to the left and right wheels of the main drive shaft 110 through the first reduction gear 130 and the first differential 140.

[0053] The first differential 140 may allow a speed difference between the left and right wheels disposed at both ends of the main drive shaft 110. For now, the first differential 140 may include a first ring gear 142, a first differential housing 148, a first planetary gear 146, and a first axle gear 147.

[0054] The first ring gear 142 may be in gear engagement with the first pinion 141 and rotate by the rotation of the first pinion 141.

[0055] The first differential case 148 can be engaged with the first ring gear 142 and rotate integrally with the first ring gear 142.

[0056] The first planet gear 146 can be disposed in the first differential case 148 and rotate integrally with the first differential case 148. The first planet gear 146 can be arranged in the first differential case 148 and rotate about its own axis and revolve around the main drive shaft 110.

[0057] The first side gear 147 can be in gear engagement with the first planet gear 146 and rotate by the rotation of the first planet gear 146. The first side gear 147 can be provided as a pair of first side gears 147, and the pair of first side gears 147 can be rotatably engaged with the main drive shaft 110. Thus, a speed difference can be allowed between the left and right wheels of the main drive shaft 110.

[0058] The first limited-slip differential 150 can limit the differential operation performed by the first differential 140 by synchronizing the left and right wheels of the main drive shaft 110.

[0059] The first limited-slip differential 150 can include a first clutch pack, and the first clutch pack includes a first metal plate 153 engaged with a clutch drum 151 and a first friction plate 154 engaged with a hub clutch 152.

[0060] The first metal plate 153 can be engaged with the clutch drum 151, and the clutch drum rotates integrally with the first differential case 148. In addition, the first friction plate 154 can be engaged with the hub clutch 152, and the hub clutch 152 rotates integrally with the main drive shaft 110. The first differential case 148 and the clutch drum 151 can be splined and rotate integrally. In addition, the hub clutch 152 and the main drive shaft 110 can be splined and rotate integrally.

[0061] The left and right wheels of the main drive shaft 110 can be synchronized by the clutch torque generated by the contact between the first metal plate 153 and the first friction plate 154, and the differential operation between the first planet gear 146 and the first side gear 147 of the first differential 140 can be restricted.

[0062] Next, the second differential 240, the disconnecting device 260, and the second limited-slip differential 250 provided on the auxiliary drive shaft 210 will be described in detail with reference to the accompanying drawings.

[0063] Figure 3 and Figure 4 are conceptual diagrams schematically showing the configuration of a differential, a limited-slip differential, and a disconnecting device provided on an auxiliary drive shaft according to an exemplary embodiment of the present application.

[0064] Reference Figure 3 and Figure 4 a second differential, a disconnecting device, and a second limited slip differential may be provided on the auxiliary drive shaft.

[0065] The second differential 240 may distribute power transmitted from the second drive source 220 to the left and right wheels of the auxiliary drive shaft 210 through the second reduction gear 230. In an exemplary embodiment of the present application, the auxiliary drive shaft 210 may be a front-wheel drive shaft.

[0066] The second drive source 220 may generate power required to drive the vehicle. The second drive source 220 may be an electric motor or an engine.

[0067] The power generated by the second drive source 220 may be transmitted to the left and right wheels of the auxiliary drive shaft 210 through the second reduction gear 230 and the second differential 240.

[0068] The second differential 240 may allow a speed difference to exist between the left and right wheels provided at both ends of the auxiliary drive shaft 210. As of now, the second differential 240 may include a second ring gear 242, a second differential housing 243, an auxiliary differential housing 244, second planetary gears 246, and second side gears 247.

[0069] The second ring gear 242 may be in gear engagement with the second pinion 241 and rotate by the rotation of the second pinion 241.

[0070] The second differential housing 243 may be joined to the second ring gear 242 and rotate integrally with the second ring gear 242.

[0071] The auxiliary differential housing 244 may be provided within the second differential housing 243. The auxiliary differential housing 244 and the second differential housing 243 may be joined or separated by the disconnecting device 260. A first spline 245 may be formed on the auxiliary differential housing 244.

[0072] The disconnecting device 260 may include sleeves 263 and 264 and a second spline 265, the sleeves 263 and 264 being configured to move axially by power, and the second spline 265 being formed at the ends of the sleeves 263 and 264.

[0073] The sleeves 263 and 264 can be moved in the axial direction (e.g., the axial direction of the auxiliary drive shaft) by the power generated by the drive part 261 (such as a drive motor or a solenoid). The drive part 261 is joined to the sleeves 263 and 264 through a connecting member 262, and the connecting member 262 connects the drive part 261 with the sleeves 263 and 264. The sleeves 263 and 264 can be slidably joined to the second differential case 243 in the axial direction. Therefore, the sleeves 263 and 264 and the second differential case 243 can rotate integrally.

[0074] The second splines 265 formed at the ends of the sleeves 263 and 264 can be selectively spline-joined to the first splines 245 formed on the auxiliary differential case 244.

[0075] Reference Figure 3 , when the sleeves 263 and 264 move in one direction in the axial direction (e.g., the direction toward the auxiliary differential case), the second splines 265 of the sleeves 263 and 264 are engaged with the first splines 245 of the auxiliary differential case, so that the second differential case 243 and the auxiliary differential case 244 are engaged with each other and rotate integrally.

[0076] When the auxiliary differential case 244 and the second differential case 243 are engaged, the auxiliary differential case 244 and the second differential case 243 can rotate integrally. Therefore, the power transmitted from the drive source can be transmitted to the left and right wheels of the auxiliary drive shaft 210 through the differential. When necessary, the left and right wheels of the auxiliary drive shaft 210 can be synchronized by the second limited-slip differential 250.

[0077] Reference Figure 4 、 Figure 5 and Figure 6 , when the sleeves 263 and 264 move in the other direction in the axial direction (e.g., the direction away from the auxiliary differential case), the second splines 265 of the sleeves 263 and 264 are separated from the first splines of the auxiliary differential case. Therefore, the auxiliary differential case 244 and the second differential case 243 rotate independently.

[0078] When the auxiliary differential case 244 and the second differential case 243 are separated, the auxiliary differential case 244 and the second differential case 243 can rotate independently of each other.

[0079] When the vehicle travels in a two-wheel drive mode, the vehicle travels only by using the power of the main drive shaft 110, and the reverse rotational force is transmitted from the wheels of the auxiliary drive shaft 210 to the second drive source 220 and the second speed reducer 230, which may reduce the efficiency of the vehicle.

[0080] In an exemplary embodiment of the present application, when the vehicle is traveling in a two-wheel drive mode, the disconnecting device 260 separates the auxiliary differential housing 244 and the second differential housing 243, which can prevent the rotational force transmitted from the wheels of the auxiliary drive shaft 210 to the second drive source 220, the second speed reducer 230, etc. That is to say, the disconnecting device 260 can prevent the reverse rotational force transmitted from the wheels of the auxiliary drive shaft 210 to the second drive source 220, the second speed reducer 230, etc., thereby improving the efficiency of the vehicle.

[0081] The second planetary gear 246 can be disposed in the auxiliary differential housing 244 and rotate integrally with the auxiliary differential housing 244. The second planetary gear 246 can be arranged in the auxiliary differential housing 244 and rotate about its own axis and revolve around the auxiliary drive shaft 210.

[0082] When the second differential housing 243 and the auxiliary differential housing 244 are engaged by the disconnecting device 260, the second planetary gear 246 rotates around the auxiliary drive shaft 210 together with the second differential housing 243 and the auxiliary differential housing 244, just like a typical differential.

[0083] When the second differential housing 243 and the auxiliary differential housing 244 are separated by the disconnecting device 260, the second differential housing 243 does not rotate, and only the auxiliary differential housing 244 disposed within the second differential housing 243 rotates around the auxiliary drive shaft 210.

[0084] The second side gear 247 can be in gear engagement with the second planetary gear 246 and rotate by the rotation of the second planetary gear 246. The second side gear 247 can be provided as a pair of second side gears 247, and the pair of second side gears 247 can be rotatably engaged to the auxiliary drive shaft 210. Therefore, a speed difference can be allowed between the left and right wheels of the auxiliary drive shaft 210.

[0085] The second limited slip differential 250 can include a second clutch group, and the second clutch group includes a second metal plate 253 engaged to a clutch drum 251 and a second friction plate 254 engaged to a hub clutch 252.

[0086] The second metal plate 253 can be engaged to the clutch drum 251, and the clutch drum rotates integrally with the second differential housing 243. In addition, the second friction plate 254 can be engaged to the hub clutch 252, and the hub clutch 252 rotates integrally with the auxiliary drive shaft 210. The second differential housing 243 and the clutch drum 251 can be spline-engaged and rotate integrally. In addition, the hub clutch 252 and the auxiliary drive shaft 210 can be spline-engaged and rotate integrally.

[0087] The left and right wheels of the auxiliary drive shaft 210 can be synchronized by the clutch torque generated by the contact between the second metal plate 253 and the second friction plate 254, and the differential operation between the second planetary gear 246 and the second half shaft gear 247 of the second differential 240 can be restricted.

[0088] Generally, an electronic limited slip differential is directly connected to a differential embedded in a speed reducer of a main drive shaft, but a disconnecting device for improving electric power economy is linearly arranged in the axial direction on the auxiliary drive shaft, which results in a lack of axial space compared with the main drive shaft. In addition, since the disconnecting device is configured to engage or disengage a drive shaft of a half shaft gear connected to a differential case, the electronic limited slip differential arranged after the disconnecting device cannot be directly connected to the differential case, which makes it difficult to install the electronic limited slip differential on the auxiliary drive shaft.

[0089] In the vehicle according to an exemplary embodiment of the present application, the second differential 240 is designed to have a double housing structure including a second differential case 243 and an auxiliary differential case 244, and the second differential case 243 is connected to a clutch drum 251 of the second limited slip differential 250 by spline engagement. In addition, the disconnecting device 260 is configured to engage or disengage the second differential case 243 and the auxiliary differential case 244.

[0090] With this structure, it is possible to prevent the disconnecting device 260 and the electronic limited slip differential from interfering with each other, and it is easy to assemble the electronic limited slip differential onto the auxiliary drive shaft 210.

[0091] Generally, a limited slip differential is not provided or the limited slip differential is only provided on the main drive shaft 110, which makes it difficult to ensure sufficient traction driving performance and turning driving performance.

[0092] On the contrary, in the vehicle according to an exemplary embodiment of the present application, electronic limited slip differentials can be respectively provided on the main drive shaft 110 and the auxiliary drive shaft 210, thereby improving the traction driving performance and turning driving performance of the vehicle.

[0093] In an exemplary embodiment of the present application, a vehicle can include various transportation means based on a concept. In some cases, a vehicle can be interpreted based on the concept as including not only various land transportation means traveling on roads, such as cars, motorcycles, trucks, and buses, but also various transportation means such as airplanes, drones, ships, etc.

[0094] For the convenience of explanation and to accurately define the appended claims, the terms "upper", "lower", "inner", "outer", "above", "below", "upward", "downward", "front", "rear", "back", "inner side", "outer side", "inward", "outward", "interior", "exterior", "internal", "external", "forward", and "backward" are used to describe the features of the exemplary embodiments with reference to the positions of these features shown in the accompanying drawings. It will be further understood that the term "connected" or its derivatives refers to both direct and indirect connections

[0095] The term "and / or" may include combinations of multiple related listed items or any one of the multiple related listed items. For example, "A and / or B" includes three cases: "A", "B", and "A and B".

[0096] In the exemplary embodiments of the present application, "at least one of A and B" may refer to "at least one of A or B" or "at least one of the combinations of at least one of A and B". In addition, "one or more of A and B" may refer to "one or more of A or B" or "one or more of the combinations of one or more of A and B".

[0097] In this specification, unless otherwise specified, the singular form also includes the plural form, unless the context clearly indicates otherwise

[0098] In the exemplary embodiments of the present application, it should be understood that terms such as "comprising" or "having" are intended to indicate the presence of the features, numerical values, steps, operations, elements, components, or combinations thereof described in the specification, and do not exclude the possibility of adding or the presence of one or more other features, numerical values, steps, operations, elements, components, or combinations thereof

[0099] According to the exemplary embodiments of the present application, components may be combined with each other to perform as a whole, or some components may be omitted

[0100] In addition, the term "fixed connection" means that the members of the fixed connection always rotate at the same speed. In addition, the term "selectively connectable" means that "the selectively connectable members rotate separately when the selectively connectable members are not combined with each other, rotate at the same speed when the selectively connectable members are combined with each other, and are stationary when at least one of the selectively connectable members is a stationary member and the remaining selectively connectable members are combined with the stationary member"

[0101] The foregoing description of the specific exemplary embodiments of the present application is for purposes of illustration and description. The foregoing is not intended to be exhaustive or to limit the application to the precise forms 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 certain principles of the application and its practical application to enable others skilled in the art to make and use various exemplary embodiments of the application, as well as its alternatives and modifications. The scope of the application is defined by the appended claims and their equivalents.

Claims

1. A vehicle comprising: a first differential configured to allow a speed difference between left and right wheels of a main drive shaft in the vehicle; a first limited slip differential configured to selectively limit differential operation of the first differential; a second differential configured to allow a speed difference between left and right wheels of an auxiliary drive shaft in the vehicle; a second limited slip differential configured to selectively limit differential operation of the second differential; as well as A disconnect device is disposed on the auxiliary drive shaft and is configured to selectively block power transmitted from the drive source to the auxiliary drive shaft.

2. The vehicle according to claim 1, wherein: The first differential comprises: First ring gear; a first differential case connected to the first ring gear and rotating integrally with the first ring gear; A first planetary gear is rotatably mounted on the first differential case and rotates on itself and revolves around the main drive shaft; and A pair of first side gears are rotatably mounted on the main drive shaft and mesh with the first planetary gears.

3. The vehicle according to claim 2, wherein: The first limited slip differential comprises: a first hub clutch that meshes with the main drive shaft and rotates integrally with the main drive shaft; a first friction plate engaged to the first hub clutch; a first clutch drum meshed with the first differential case and rotating integrally with the first differential case; and A first metal plate is joined to the first clutch drum.

4. The vehicle according to claim 3, wherein: The main drive shaft and the first hub clutch are spline-engaged with each other.

5. The vehicle according to claim 3, wherein: The first differential case and the first clutch drum are spline-engaged with each other.

6. The vehicle according to claim 2, wherein: The second differential comprises: Second ring gear; a second differential case connected to the second ring gear and rotating integrally with the second ring gear; an auxiliary differential case configured to be selectively engaged to the second differential case via a disconnect device; A second planetary gear is rotatably mounted on the auxiliary differential case and rotates on itself and revolves around the auxiliary drive shaft; and A second side gear is rotatably mounted on the auxiliary drive shaft and meshes with the second planetary gear.

7. The vehicle according to claim 6, wherein: The auxiliary differential case is disposed within the second differential case.

8. The vehicle according to claim 6, wherein: The second limited slip differential comprises: a second hub clutch that meshes with the auxiliary drive shaft and rotates unitarily with the auxiliary drive shaft; a second friction plate engaged to the second hub clutch; a second clutch drum engaged with and rotating integrally with the second differential case; and A second metal plate is joined to the second clutch drum.

9. The vehicle according to claim 8, wherein: The auxiliary drive shaft and the second hub clutch are spline-engaged with each other.

10. The vehicle according to claim 8, wherein: The second differential case and the second clutch drum are spline-engaged with each other.

11. The vehicle according to claim 6, wherein: The disconnect device separates or engages the second differential case with the auxiliary differential case.

12. The vehicle according to claim 11, wherein: The disconnect device includes a sleeve slidably engaged to the second differential case and selectively engaged to the auxiliary differential case.

13. The vehicle of claim 12, wherein: A first face spline is formed at an end of the auxiliary differential housing, and a second face spline is formed at an end of the sleeve; The first face splines of the auxiliary differential case and the second face splines of the sleeve are selectively engaged with each other by a drive portion engaged to the sleeve.

14. A differential comprising: Ring gear; a differential housing that rotates integrally with the ring gear; an auxiliary differential case selectively engaged to the differential case; A planetary gear, which is disposed on the auxiliary differential housing and rotates on itself and revolves around the drive shaft; as well as Axle gears mesh with the planetary gears.

15. The differential according to claim 14, wherein: The auxiliary differential housing is disposed within the differential housing.

16. The differential according to claim 14, wherein: The differential housing is coupled to a first side of a limited slip differential; The drive shaft is coupled to a second side of the limited slip differential.

17. The differential according to claim 16, wherein: The differential housing is engaged to a clutch drum of a limited slip differential; The drive shaft is engaged to the hub clutch of the limited slip differential.

18. The differential according to claim 14, wherein: The differential case and the auxiliary differential case are selectively engaged by a disconnect device.

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