Powertrain of vehicle

Abstract

The present invention comprises: a differential which is driven by a motor; drive pinions installed to drive wheels by receiving power from the differential; and ring gears integrally provided in the wheels to engage with the drive pinions to receive power.

Description

Vehicle's powertrain

[0001] The present invention relates to a powertrain of a vehicle, and more specifically, to a technology regarding a powertrain of an electric vehicle.

[0002] The electric vehicle powertrain includes an e-Axle system, which is an integrated drive module comprising a motor, inverter, reduction gear, differential, etc., and is also referred to as an electric drive module, e-Drive, e-Drivetrain, e-Powertrain, etc.

[0003] Among the above e-Axle systems, there is a coaxial axle type in which the rotating shaft of the motor is arranged concentrically with the drive shaft.

[0004] Although the above-mentioned coaxial axle e-Axle system has the advantage of being simple in configuration and lightweight, the rotation axis of the motor and the rotation axis of the drive wheel are positioned coaxially, so the distance between the upper side of the motor and the vehicle body is short, which may cause the motor to come into contact with the vehicle body during a bump of the drive wheel.

[0005] Therefore, in the case of a vehicle equipped with the above-mentioned coaxial axle type e-Axle system, there is a problem in that it is difficult to lower the height of the vehicle's cargo bed.

[0006]

[0007] The matters described above as background technology are intended only to enhance understanding of the background of the present invention and should not be construed as an acknowledgment that they constitute prior art already known to those skilled in the art.

[0008] The present invention has been devised to solve the problems described above, and aims to provide a vehicle powertrain configured such that the upper side of the motor is sufficiently spaced apart from the vehicle body or cargo box, thereby ensuring sufficient clearance between the upper side of the motor and the vehicle body when the drive wheel bumps, thereby preventing collision or damage to the e-Axle system, ensuring durability, and enabling easy implementation of a low profile for the vehicle body or cargo box.

[0009]

[0010] The technical problems to be solved by the present invention are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the description below.

[0011] The powertrain of the vehicle of the present invention for achieving the above purpose is,

[0012] Differential driven by a motor;

[0013] A drive pinion installed to drive a wheel by receiving power from the above differential;

[0014] A ring gear integrally provided on the wheel to receive power by meshing with the drive pinion;

[0015] It is characterized by being composed including

[0016]

[0017] The above ring gear is provided on the inner circumference of the wheel;

[0018] The above driving pinion can be internally meshed with the above ring gear.

[0019]

[0020] The above driving pinion can be engaged with the ring gear at a position lower than the center of the ring gear.

[0021]

[0022] The rotating shaft of the above motor is equipped with a reduction drive gear;

[0023] The diffring gear of the above differential externally meshes with the above reduction drive gear to form a reduction gear;

[0024] The motor can be fixed to the axle housing that encloses the reduction drive gear and the differential.

[0025]

[0026] The above wheel is rotatably supported in a wheel housing;

[0027] The above wheel housing is connected to the above axle housing through a beam tube;

[0028] A disconnecter that switches between a state of transmitting power between the differential and the drive pinion and a state of disconnecting power may be provided and arranged inside the beam tube.

[0029]

[0030] The above disconnector is,

[0031] Inner shaft connected to the above differential;

[0032] An outer shaft arranged concentrically with the inner shaft and connected to the drive pinion;

[0033] An inner clutch gear integrally formed on the inner shaft;

[0034] An outer clutch gear integrally formed on the above outer shaft;

[0035] A sleeve installed to slide linearly along the axial direction of the inner shaft to switch between a state in which it is engaged with both the inner clutch gear and the outer clutch gear and a state in which it is engaged with only one of them;

[0036] An actuator configured to allow the above sleeve to slide in a straight line;

[0037] It can be configured to include.

[0038]

[0039] The above outer shaft can be rotatably supported in the above wheel housing.

[0040]

[0041] The center of the wheel is provided with a center boss formed linearly along the wheel's rotational center axis;

[0042]

[0043] A carrier supporting the center boss is formed in the wheel housing;

[0044] A center bearing that supports the rotation of the wheel relative to the wheel housing may be provided between the carrier and the center boss.

[0045]

[0046] A sealing may be installed on the inner outer circumference of the wheel to seal the gap with the wheel housing.

[0047]

[0048] An outer bearing is installed between the wheel and the wheel housing;

[0049] A sealing that seals the space between the wheel and the wheel housing may be installed on the outer side of the outer bearing.

[0050]

[0051] The above wheel housing, beam tube, and axle housing can be installed to be vertically movable relative to the vehicle body through a suspension system.

[0052]

[0053] In addition, the powertrain of the vehicle of the present invention for achieving the above-mentioned purpose is,

[0054] Differential;

[0055] A drive pinion installed to rotate by receiving power from the above differential;

[0056] A ring gear integrally formed on the inner circumference of a wheel to mesh with the above-mentioned driving pinion;

[0057] A disconnecter provided to interrupt power transmission between the above-mentioned differential and the drive pinion;

[0058] It is characterized by being composed including

[0059]

[0060] The inner side of the vehicle body of the above wheel is sealed by a wheel housing;

[0061] The wheel housing can support the wheel and the drive pinion so that the drive pinion meshes with the ring gear below the center of the ring gear.

[0062]

[0063] A center bearing is installed between the center of the wheel and the wheel housing, and

[0064]

[0065] An outer bearing may be installed between the outer edge of the wheel and the wheel housing.

[0066]

[0067] A center boss extending linearly toward the wheel housing is provided at the center of the wheel;

[0068] The wheel housing is equipped with a carrier that supports the center boss;

[0069] The center bearing can be provided between the center boss and the carrier.

[0070]

[0071] Between the outer edge of the wheel and the wheel housing, a sealing that seals the space between the wheel and the wheel housing may be provided.

[0072]

[0073] The above disconnecter

[0074] An inner shaft installed to receive power from the above differential;

[0075] An outer shaft arranged concentrically with the inner shaft and equipped with the driving pinion;

[0076] An inner clutch gear integrally formed on the inner shaft;

[0077] An outer clutch gear integrally formed on the above outer shaft;

[0078] A sleeve installed to slide linearly along the axial direction of the inner shaft to switch between a state in which it is engaged with both the inner clutch gear and the outer clutch gear and a state in which it is engaged with only one of them;

[0079] An actuator configured to allow the above sleeve to slide in a straight line;

[0080] It can be configured to include.

[0081]

[0082] The above differential is equipped with a diffring gear;

[0083] A reduction drive gear connected to a motor meshes with the above-mentioned diffring gear;

[0084] The above reduction drive gear and defroster gear are enclosed within the axle housing;

[0085] The above axle housing can be connected to the wheel housing through a beam tube that surrounds the inner shaft and the outer shaft.

[0086]

[0087] The above axle housing, beam tube, and wheel housing can be installed to be movable relative to the vehicle body through a suspension system.

[0088]

[0089] The sleeve constituting the disconnecter is installed within the beam tube so as to be able to slide linearly along the longitudinal direction of the beam tube;

[0090] The actuator can be installed outside the beam tube to transmit operating force to the sleeve through an operating slot formed in the beam tube.

[0091]

[0092] According to the present invention, the upper side of the motor is configured to be sufficiently spaced apart from the vehicle body or cargo box, thereby ensuring a sufficient gap between the upper side of the motor and the vehicle body when the drive wheel bumps, thus preventing collision or damage to the e-Axle system, ensuring durability, and making it easy to implement a low profile of the vehicle body or cargo box.

[0093] In addition, the present invention improves the power transmission efficiency of the motor during vehicle operation and enables the vehicle's fuel efficiency to be improved through energy-efficient driving.

[0094]

[0095] The effects obtainable from the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description below.

[0096] FIG. 1 is a configuration diagram illustrating a powertrain of a vehicle according to one embodiment of the present invention,

[0097] FIG. 2 is a detailed view of the main part of FIG. 1,

[0098] FIG. 3 is a drawing illustrating another embodiment of the present invention,

[0099] FIG. 4 is a drawing illustrating another example of an outer bearing arrangement,

[0100] FIG. 5 is a drawing illustrating another embodiment including a deceleration idler,

[0101] FIG. 6 is a drawing illustrating another embodiment including a planetary reduction gear.

[0102] FIG. 7 is a drawing illustrating another embodiment in which the reduction gear is excluded.

[0103] In describing the embodiments disclosed in this specification, if it is determined that a detailed description of related prior art may obscure the essence of the embodiments disclosed in this specification, such detailed description is omitted. Furthermore, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and technical scope of the present invention.

[0104] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0105] A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0106] In this specification, terms such as “comprising” or “having” are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0107] The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the ease of drafting the specification, and do not inherently possess distinct meanings or roles.

[0108] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0109] In addition, the term "Unit" or "Control Unit" included in names such as Motor Control Unit (MCU) and Hybrid Control Unit (HCU) is merely a term widely used in naming controllers that control specific vehicle functions, and does not mean a generic function unit.

[0110] A controller may include a communication device that communicates with other controllers or sensors to control the function it is responsible for, a memory that stores an operating system, logic instructions, and input / output information, and one or more processors that perform judgments, calculations, decisions, etc., necessary for controlling the function it is responsible for.

[0111]

[0112] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components regardless of drawing symbols are given the same reference number, and redundant descriptions thereof will be omitted.

[0113]

[0114] Referring to FIGS. 1 and 2, an embodiment of the powertrain of the vehicle of the present invention comprises: a differential (3) driven by a motor (1); a driving pinion (7) installed to drive a wheel (5) by receiving power from the differential (3); and a ring gear (9) integrally provided on the wheel (5) to receive power by meshing with the driving pinion (7).

[0115] That is, in the powertrain of the present invention, when the driving force generated by the motor (1) is divided into two sides through the differential (3) and transmitted to the driving pinion (7), the driving force of the wheel (5) is generated by the rotation of the ring gear (9) engaged with the driving pinion (7).

[0116]

[0117] The ring gear (9) is provided on the inner circumference of the wheel (5); and the driving pinion (7) is engaged internally with the ring gear (9).

[0118] In particular, the driving pinion (7) is engaged with the ring gear (9) at a position lower than the center of the ring gear (9).

[0119] Accordingly, the differential (3) and motor (1) that provide power to the drive pinion (7) can be positioned so as to be offset downward relative to the wheel (5), and such a positioning structure effectively prevents the upper parts of the differential (3) and motor (1) from colliding with or interfering with the vehicle body (25) or the cargo box when the wheel (5) bumps.

[0120]

[0121] A reduction drive gear (11) is provided on the rotating shaft of the motor (1); the diffring gear (13) of the differential (3) is externally engaged with the reduction drive gear (11) to form a reduction gear; and the motor (1) is fixed to an axle housing (15) that encloses the reduction drive gear (11) and the differential (3).

[0122] That is, the power of the motor (1) is supplied to the differential (3) in a reduced state through the reduction drive gear (11) and the deceleration gear (13), and the axle housing (15) is configured to surround the reduction drive gear (11) and the deceleration gear (13) so that the motor (1) can be fixed, thereby allowing the motor (1) and the differential (3) to be formed as a single unit.

[0123] Accordingly, the interior of the axle housing (15) is sealed from the outside to prevent foreign matter from penetrating from the outside into the meshing portion of the reduction drive gear (11) and the depressing gear (13), and to allow the lubrication of the reduction drive gear (11) and the depressing gear (13) to be easily and stably performed.

[0124]

[0125] The wheel (5) is rotatably supported in a wheel housing (17); the wheel housing (17) is connected to the axle housing (15) through a beam tube (19); and inside the beam tube (19) is provided a disconnecter (21) that switches between a state of transmitting power between the differential (3) and the drive pinion (7) and a state of disconnecting power.

[0126] Accordingly, the wheel housing (17), beam tube (19), and axle housing (15) form a single unit and are installed to be able to move up and down relative to the vehicle body (25) through the suspension device (23).

[0127] Of course, the above suspension system (23) may be composed of a combination of springs and shock absorbers, etc., so that the wheel housing (17), beam tube (19), and axle housing (15) are elastically supported in the vertical direction with respect to the vehicle body (25) and vibrations can be dampened.

[0128]

[0129] The disconnector (21) comprises: an inner shaft (27) connected to the differential (3); an outer shaft (29) arranged concentrically with the inner shaft (27) and connected to the drive pinion (7); an inner clutch gear (31) formed integrally with the inner shaft (27); an outer clutch gear (33) formed integrally with the outer shaft (29); a sleeve (35) installed to switch between a state in which it is engaged with both the inner clutch gear (31) and the outer clutch gear (33) and a state in which it is engaged with only one of them by sliding linearly along the axial direction of the inner shaft (27); and an actuator (37) provided to allow the sleeve (35) to slide linearly.

[0130] Accordingly, as the actuator (37) moves the sleeve (35) in a straight line, the sleeve (35) can be switched between a state in which the inner clutch gear (31) or the outer clutch gear is engaged only with one of them, thereby cutting off power between the inner shaft (27) and the outer shaft (29), and a state in which the sleeve (35) is engaged simultaneously with both the inner clutch gear (31) and the outer clutch gear (33), thereby transmitting power between the inner shaft (27) and the outer shaft (29).

[0131] Accordingly, when power is not required to be supplied from the motor (1) toward the drive pinion (7), such as during driving or coasting of the vehicle, the actuator (37) drives the sleeve (35) to block power transmission between the outer shaft (29) and the inner shaft (27), thereby allowing the wheel (5) to rotate freely from the rotational resistance of the differential (3) and the motor (1), so that the driving distance of the vehicle can be increased and fuel efficiency improved through efficient driving of the vehicle.

[0132] Of course, except for the above case, the sleeve (35) is engaged with both the inner clutch gear (31) and the outer clutch gear (33) so that power transmission between the inner shaft (27) and the outer shaft (29) can be stably achieved.

[0133] Of course, the actuator (37) is configured to adjust the position of the sleeve (35) according to the driving conditions of the vehicle by a separate controller.

[0134]

[0135] The outer shaft (29) is rotatably supported in the wheel housing (17).

[0136] A center boss (39) is provided at the center of the wheel (5) and formed linearly along the rotational center axis of the wheel (5); a carrier (41) that supports the center boss (39) is formed in the wheel housing (17); and a center bearing (43) that supports the rotation of the wheel (5) relative to the wheel housing (17) is provided between the carrier (41) and the center boss (39).

[0137] Accordingly, the wheel (5) is rotatably supported by the center bearing (43) with respect to the wheel housing (17) and rotated by the power transmitted by the drive pinion (7), thereby enabling the driving force of the vehicle to be exerted.

[0138] Meanwhile, a sealing (45) is installed on the inner outer circumference of the wheel (5) to seal the space between it and the wheel housing (17).

[0139] Accordingly, the interior of the wheel (5) is sealed off from the outside by the wheel housing (17) and sealing (45), so that foreign substances cannot penetrate from the outside, and smooth and stable lubrication is possible at the meshing portion of the drive pinion (7) and ring gear (9).

[0140]

[0141] Additionally, referring to FIG. 3 which illustrates another embodiment of the present invention, an outer bearing (47) is additionally installed between the wheel (5) and the wheel housing (17); and a sealing (45) is installed on the outer side of the outer bearing (47) to seal the space between the wheel (5) and the wheel housing (17).

[0142] In this case, the wheel (5) is supported by the center bearing (43) at the center and by the outer bearing (47) at the outer end, thereby ensuring a very solid and stable support state for the wheel housing (17).

[0143] In addition, the sealing (45) is installed to seal the space between the wheel (5) and the wheel housing (17) while also preventing the outer bearing (47) from being exposed to the outside, thereby promoting not only lubrication and external isolation of the drive pinion (7) and the ring gear (9), but also stable lubrication and improved durability of the outer bearing (47).

[0144]

[0145] The outer bearing (47) may be installed inside the wheel (5), as illustrated in FIG. 4.

[0146] That is, the outer race of the outer bearing (47) is fixed to the inner circumference of the wheel (5), and a portion inserted into the inner side of the wheel (5) is formed in the wheel housing (17) to fix the inner race of the outer bearing (47), so that the outer bearing (47) supports the radial load of the wheel (5) between the wheel (5) and the outer bearing (47).

[0147]

[0148] Meanwhile, FIG. 5 illustrates another embodiment of the present invention that can be compared with FIG. 2, wherein the motor (1) is arranged to form a concentric axis with the differential (3), and a reduction idler (51) is provided between the rotation axis of the motor (1) and the differential (3).

[0149] Accordingly, the motor (1) is positioned lower than in the embodiment of FIG. 2, thereby more effectively preventing the upper part of the motor (1) from colliding with or interfering with the vehicle body (25) or the cargo box when the wheel (5) bumps, and making it more advantageous for lowering the vehicle.

[0150] In addition, FIG. 6 illustrates another embodiment of the present invention, wherein, as in the embodiment of FIG. 5, the motor (1) is arranged to form a concentric axis with the differential (3), and a planetary reduction gear (53) is provided coaxially between the motor (1) and the differential (3).

[0151] The embodiment of Fig. 6 has the advantage that, compared to the embodiment of Fig. 5, the configuration in which the deceleration idler (51) protrudes upward is excluded, thereby allowing the vertical distance between the upper part of the differential (3) and the motor (1) and the vehicle body or cargo box to be secured to be greater.

[0152] Meanwhile, if there is sufficient power to be provided by the motor (1), it may be possible to arrange the differential (3) and the motor (1) coaxially as in the embodiment shown in FIG. 7, while excluding components such as the reduction idler (51) or planetary reduction gear (53).

[0153]

[0154] The powertrain of the vehicle of the present invention configured as described above may be expressed as follows.

[0155] That is, the powertrain of the vehicle of the present invention comprises a differential (3); a driving pinion (7) installed to rotate by receiving power from the differential (3); a ring gear (9) integrally formed on the inner circumference of a wheel (5) so as to mesh with the driving pinion (7); and a disconnecter (21) provided to interrupt the transmission of power between the differential (3) and the driving pinion (7).

[0156] The inner side of the body (25) of the wheel (5) is sealed by a wheel housing (17); the wheel housing (17) can support the wheel (5) and the drive pinion (7) so that the drive pinion (7) engages with the ring gear (9) below the center of the ring gear (9).

[0157] A center bearing (43) may be installed between the center of the wheel (5) and the wheel housing (17), and an outer bearing (47) may be installed between the outer edge of the wheel (5) and the wheel housing (17).

[0158] A center boss (39) extending linearly toward the wheel housing (17) is provided at the center of the wheel (5); a carrier (41) supporting the center boss (39) is provided in the wheel housing (17); and a center bearing (43) may be provided between the center boss (39) and the carrier (41).

[0159] Between the outer edge of the wheel (5) and the wheel housing (17), a sealing (45) that seals the space between the wheel (5) and the wheel housing (17) may be provided.

[0160] That is, the sealing (45) allows relative rotation between the wheel (5) and the wheel housing (17) while blocking the passage of fluids such as oil.

[0161] The disconnecter (21) comprises: an inner shaft (27) installed to receive power from the differential (3); an outer shaft (29) arranged concentrically with the inner shaft (27) and equipped with the drive pinion (7); an inner clutch gear (31) formed integrally with the inner shaft (27); an outer clutch gear (33) formed integrally with the outer shaft (29); a sleeve (35) installed to switch between a state in which it is engaged with both the inner clutch gear (31) and the outer clutch gear (33) and a state in which it is engaged with only one of them by sliding linearly along the axial direction of the inner shaft (27); and an actuator (37) provided to enable linear sliding of the sleeve (35).

[0162] The differential (3) is equipped with a diffring gear (13); a reduction drive gear (11) connected to a motor (1) is engaged with the diffring gear (13); the reduction drive gear (11) and the diffring gear (13) are enclosed within an axle housing (15); and the axle housing (15) is connected to the wheel housing (17) through a beam tube (19) that encloses the inner shaft (27) and the outer shaft (29).

[0163] The above axle housing (15), beam tube (19), and wheel housing (17) are installed to be able to move up and down relative to the vehicle body (25) via a suspension device (23).

[0164] The sleeve (35) constituting the disconnecter (21) is installed within the beam tube (19) so as to be able to slide linearly along the longitudinal direction of the beam tube (19); and the actuator (37) is installed outside the beam tube (19) to transmit operating force to the sleeve (35) through an operating slot (49) formed in the beam tube (19).

[0165]

[0166] Although specific embodiments of the present invention have been illustrated and described, it will be obvious to those skilled in the art that the present invention can be modified and changed in various ways without departing from the technical spirit of the invention as provided by the following claims.

[0167] [Explanation of the symbol]

[0168] 1; motor

[0169] 3; Differential

[0170] 5; Wheel

[0171] 7; driving pinion

[0172] 9; Ring gear

[0173] 11; reduction drive gear

[0174] 13; Depring gear

[0175] 15; Axle housing

[0176] 17; Wheel housing

[0177] 19; Beam tube

[0178] 21; Disconnector

[0179] 23; Suspension system

[0180] 25; body

[0181] 27; Inner shaft

[0182] 29; outer shaft

[0183] 31; Inner clutch gear

[0184] 33; outer clutch gear

[0185] 35; Sleeve

[0186] 37; Actuator

[0187] 39; Center Boss

[0188] 41; Carrier

[0189] 43; Center bearing

[0190] 45; Sealing

[0191] 47; outer bearing

[0192] 49; manipulation slot

[0193] 51; Deceleration idler

[0194] 53; Planetary deceleration device

Claims

1. A differential driven by a motor; A drive pinion installed to drive a wheel by receiving power from the above differential; A ring gear integrally provided on the wheel to receive power by meshing with the drive pinion; A vehicle powertrain characterized by being composed including 2. In Claim 1, The above ring gear is provided on the inner circumference of the wheel; The above driving pinion is in internal mesh with the above ring gear. A vehicle powertrain characterized by 3. In Claim 2, The above driving pinion is engaged with the ring gear at a position lower than the center of the ring gear. A vehicle powertrain characterized by 4. In Claim 3, The rotating shaft of the above motor is equipped with a reduction drive gear; The diffring gear of the above differential externally meshes with the above reduction drive gear to form a reduction gear; The motor is fixed to the axle housing surrounding the above reduction drive gear and differential. A vehicle powertrain characterized by 5. In Claim 4, The above wheel is rotatably supported in a wheel housing; The above wheel housing is connected to the above axle housing through a beam tube; The interior of the beam tube is equipped with a disconnector that switches between a state of transmitting power between the differential and the drive pinion and a state of disconnecting power. A vehicle powertrain characterized by 6. In Claim 5, The above disconnector is, Inner shaft connected to the above differential; An outer shaft arranged concentrically with the inner shaft and connected to the drive pinion; An inner clutch gear integrally formed on the inner shaft; An outer clutch gear integrally formed on the above outer shaft; A sleeve installed to slide linearly along the axial direction of the inner shaft to switch between a state in which it is engaged with both the inner clutch gear and the outer clutch gear and a state in which it is engaged with only one of them; An actuator configured to allow the above sleeve to slide in a straight line; A vehicle powertrain characterized by being composed including 7. In Claim 6, The above outer shaft is rotatably supported in the above wheel housing. A vehicle powertrain characterized by 8. In Claim 5, The center of the wheel is provided with a center boss formed linearly along the wheel's rotational center axis; A carrier supporting the center boss is formed in the wheel housing; A center bearing is provided between the carrier and the center boss to support the rotation of the wheel relative to the wheel housing. A vehicle powertrain characterized by 9. In Claim 8, A sealing is installed on the inner outer circumference of the wheel to seal the gap with the wheel housing. A vehicle powertrain characterized by 10. In Claim 8, An outer bearing is installed between the wheel and the wheel housing; A sealing is installed on the outer side of the outer bearing to seal the space between the wheel and the wheel housing. A vehicle powertrain characterized by 11. In Claim 5, The above wheel housing, beam tube, and axle housing are installed to be able to move up and down relative to the vehicle body through a suspension system. A vehicle powertrain characterized by 12. Differential; A drive pinion installed to rotate by receiving power from the above differential; A ring gear integrally formed on the inner circumference of a wheel to mesh with the above-mentioned driving pinion; A disconnecter provided to interrupt power transmission between the above-mentioned differential and the drive pinion; A vehicle powertrain characterized by being composed including 13. In Claim 12, The inner side of the vehicle body of the above wheel is sealed by a wheel housing; The wheel housing supports the wheel and the drive pinion so that the drive pinion meshes with the ring gear below the center of the ring gear. A vehicle powertrain characterized by 14. In Claim 13, A center bearing is installed between the center of the wheel and the wheel housing, and An outer bearing is installed between the outer edge of the wheel and the wheel housing. A vehicle powertrain characterized by 15. In Claim 14, A center boss extending linearly toward the wheel housing is provided at the center of the wheel; The wheel housing is equipped with a carrier that supports the center boss; The above center bearing is provided between the center boss and the carrier. A vehicle powertrain characterized by 16. In Claim 13, Between the outer edge of the wheel and the wheel housing, a sealing is provided to seal the space between the wheel and the wheel housing. A vehicle powertrain characterized by 17. In Claim 13, The above disconnecter An inner shaft installed to receive power from the above differential; An outer shaft arranged concentrically with the inner shaft and equipped with the driving pinion; An inner clutch gear integrally formed on the inner shaft; An outer clutch gear integrally formed on the above outer shaft; A sleeve installed to slide linearly along the axial direction of the inner shaft to switch between a state in which it is engaged with both the inner clutch gear and the outer clutch gear and a state in which it is engaged with only one of them; An actuator configured to allow the above sleeve to slide in a straight line; A vehicle powertrain characterized by being composed including 18. In Claim 17, The above differential is equipped with a diffring gear; A reduction drive gear connected to a motor meshes with the above-mentioned diffring gear; The above reduction drive gear and defroster gear are enclosed within the axle housing; The above axle housing is connected to the wheel housing through a beam tube that encloses the inner shaft and the outer shaft. A vehicle powertrain characterized by 19. In Claim 18, The above axle housing, beam tube, and wheel housing are installed to be able to move up and down relative to the vehicle body through a suspension system. A vehicle powertrain characterized by 20. In Claim 19, The sleeve constituting the disconnecter is installed within the beam tube so as to be able to slide linearly along the longitudinal direction of the beam tube; The actuator is installed to transmit operating force to the sleeve through an operating slot formed in the beam tube from the outside of the beam tube. A vehicle powertrain characterized by

Images