Vehicle and drive axle thereof

Abstract

The application relates to a vehicle and a drive axle thereof, the drive axle comprising: a middle axle assembly comprising a first input member capable of rotating around a first axis; and a rear axle assembly; wherein the middle axle assembly further comprises a shaft coupling arranged along the first axis, the first input member is coaxially connected with the rear axle assembly through the shaft coupling; and a wheel shaft passes through the shaft coupling in a first direction and is drivingly connected with the first input member, the first direction intersects with the first axis. The shaft coupling with a transmission cavity is arranged, coaxial connection of the middle axle assembly and the transmission assembly is realized, coaxial arrangement of the middle axle and the rear axle assembly is realized, the layout space in the vehicle is saved, the total weight and the manufacturing cost of the vehicle are reduced, and the transmission efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of axle, in particular to a vehicle and a drive axle thereof. BACKGROUND

[0002] Compared with ordinary commercial vehicles, the torque to be transmitted inside the heavy commercial vehicle is larger, so a larger power engine needs to be selected, which has higher requirements for the transmission system, and the drive axle plays a key role in the transmission system.

[0003] The conventional heavy commercial vehicle adopts a double drive axle, that is, a technology of combining middle axle driving with rear axle driving, wherein the middle axle driving technology adopts a double parallel shaft structure design, which needs to occupy a larger interior layout space and further increases the weight and cost of the heavy vehicle, and at the same time, the double parallel shaft structure needs a complex transmission structure to cooperate, so that the overall transmission efficiency of the drive axle is low. SUMMARY

[0004] Therefore, it is necessary to provide a vehicle and a drive axle thereof with high transmission efficiency, compact structure and low cost in view of the above problems.

[0005] In one aspect, a drive axle of a vehicle is provided, the vehicle drive axle comprising a wheel shaft, the vehicle drive axle comprising:

[0006] a middle axle assembly comprising a first input member rotatable about a first axis; and

[0007] a rear axle assembly;

[0008] wherein the middle axle assembly further comprises a shaft coupling disposed along the first axis, and the first input member is coaxially connected to the rear axle assembly through the shaft coupling;

[0009] the wheel shaft passes through the shaft coupling along a first direction and is in transmission connection with the first input member, and the first direction is disposed intersecting the first axis.

[0010] In one embodiment, the middle axle assembly further comprises a first bevel gear and a differential; the first bevel gear is sleeved outside the first input member; the differential is connected to an end of the wheel shaft passing through the shaft coupling, and the differential comprises a second bevel gear meshing with the first bevel gear.

[0011] In one embodiment, the shaft coupling comprises a first end, a second end and a transmission cavity; the first end is connected to the first input member, the second end is in transmission connection with the rear axle assembly; the transmission cavity is located between the first end and the second end, and the wheel shaft is arranged in the transmission cavity along the first direction. In one embodiment, the shaft coupling comprises:

[0012] A first connecting gear is disposed at the first end and connected to the first input component;

[0013] The second connecting gear is located at the second end and is connected to the rear axle assembly for transmission.

[0014] A planetary gear set is connected to the first connecting gear and the second connecting gear respectively, and the transmission cavity extends through the planetary gear set along the first direction.

[0015] In one embodiment, the planetary gear set includes:

[0016] Planetary carrier, connecting the first connecting gear and the second connecting gear;

[0017] A planetary gear is connected to the planet carrier. One end of the planetary gear meshes with the first connecting gear, and the other end meshes with the second connecting gear. At least two planetary gears are provided, and the two planetary gears are respectively provided on opposite sides of the planet carrier along a second direction, which is perpendicular to the first direction.

[0018] In one embodiment, the planetary gear includes a body portion and a meshing portion. The body portion is connected to the planet carrier, and the meshing portion is located at both ends of the body portion, respectively meshing with the first connecting gear and the second connecting gear.

[0019] In one embodiment, the body portion is provided with a connecting hole, and the planetary gear set further includes a planetary gear shaft passing through the connecting hole, and the planetary gear is connected to the planet carrier through the planetary gear shaft.

[0020] In one embodiment, a bearing is provided between the first connecting gear and the planetary gear set; and / or a bearing is provided between the second connecting gear and the planetary gear set. In one embodiment, the coupling further includes a limiting member for limiting the position of the first connecting gear or the second connecting gear relative to the planetary gear set along a first axis.

[0021] On the one hand, a vehicle is provided, which is equipped with the aforementioned drive axle.

[0022] In this application, the middle axle assembly and the rear axle assembly are coaxially connected. Through a coupling arranged along the first axis, and with the wheel axle passing through the coupling, the middle axle assembly transmits power to the wheel axle without affecting the coaxial connection between the front axle assembly and the rear axle assembly. The mechanism of this application saves interior space, reduces the total weight and manufacturing cost of the vehicle, simplifies the transmission structure, and improves transmission efficiency. Attached Figure Description

[0023] Figure 1 This is a partial structural diagram of the drive bridge in one embodiment of this application.

[0024] Figure 2 This is a cross-sectional schematic diagram of a coupling in one embodiment of this application.

[0025] Figure 3 This is an exploded structural diagram of a coupling in one embodiment of this application. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] In traditional technology, the middle axle assembly employs a two-parallel-shaft structure. One of these shafts is the input power shaft, coaxially equipped with an inter-shaft differential, and coaxially mounted with the drive component of the rear axle assembly. The other shaft is the middle axle drive shaft. The two parallel shafts of the middle axle assembly are typically connected by a gear pair. This dual-parallel-shaft structure requires more interior space, increasing the vehicle's overall weight and manufacturing cost. Furthermore, the two-shaft structure necessitates more transmission components in the middle axle assembly, resulting in lower motion transmission efficiency.

[0033] In this application, in order to solve the problems of complex structure, low transmission efficiency, large space occupation and high cost of traditional drive axles, a drive axle with the middle axle assembly and the rear axle assembly coaxially connected is designed, which makes the drive axle have high transmission efficiency, compact structure and small space occupation in the vehicle, and the total weight and cost of the vehicle using this drive axle are lower.

[0034] See Figure 1 , Figure 1 A schematic diagram of a drive axle for a vehicle according to an embodiment of this application is shown. The drive axle 1 provided in one embodiment of this application includes a middle axle assembly 10, a rear axle assembly 20, and a transmission assembly 30 that drives the middle axle assembly 10 and the rear axle assembly 20. In this embodiment, the middle axle assembly 10 and the rear axle assembly 20 simultaneously output driving force, and the middle axle assembly 10 and the rear axle assembly 20 respectively output the required power to the corresponding wheel assemblies to achieve the driving function.

[0035] The middle axle assembly 10 includes a first input member 12, a first bevel gear 11 connecting the first input member 12, a differential 14, a coupling 100, and a wheel axle 13. The first bevel gear 11 moves under the action of the first input member 12. The first input member 12, the first bevel gear 11, and the coupling 100 are all arranged along a first axis 10a. Specifically, the central axes of the first input member 12 and the first bevel gear 11 coincide with the first axis 10a. The first bevel gear 11 and the first input member 12 rotate about the first axis 10a. Further, the first bevel gear 11 is sleeved on the outside of the first input member 12, and a through hole is formed inside the first bevel gear 11 for the first input member 12 to pass through and connect to. The first input member 12 passes through the through hole and extends out from one end of the first bevel gear 11. The middle axle assembly 10 can actively output driving force to the corresponding wheel (not shown in the figure). The first bevel gear 11 is connected to the differential 14, which is connected to one end of the wheel axle 13 that extends out of the coupling 100. Specifically, the differential 14 is coaxially arranged with the wheel axle 13. Wheels are connected to both ends of the wheel axle 13, and the differential 14 allows the wheels at both ends of the wheel axle 13 to rotate at different speeds. Correspondingly, the differential 14 is also provided with a second bevel gear 143 that meshes with the first bevel gear 11.

[0036] Combination Figure 2 As shown, Figure 2A schematic diagram of a coupling for a vehicle drive axle according to an embodiment of this application is shown. A first input member 12 is coaxially connected to a rear axle assembly 20 via a coupling 100. The coupling 100 includes a first end 101, a second end 102, and a transmission cavity 103. The first end 101 is connected to the first input member 12, and the second end 102 is connected to a transmission assembly 30. The transmission cavity 103 is located between the first end 101 and the second end 102, and is used to accommodate the vehicle's wheel axle 13, i.e., the transmission cavity 103 is used to allow the vehicle's wheel axle 13 to pass through the coupling 100 in a first direction. The central axis 10b of the wheel axle 13 intersects with the first axis 10a, and the direction parallel to the central axis 10b is the first direction. In this embodiment, the central axis 10b of the wheel axle 13 is perpendicular to the first axis 10a. Specifically, the first bevel gear 11 has a bevel tooth surface with a 45° inclination angle, and correspondingly, the differential 14 includes a bevel tooth surface with a 45° inclination angle.

[0037] The first end 101 and the second end 102 of the coupling 100 are arranged sequentially along the first axis 10a, such that the first input component 12 and the transmission assembly 30 connected to the coupling 100 are arranged along the first axis 10a, thereby making the middle axle assembly 10 and the rear axle assembly 20 coaxially arranged. The coaxial arrangement of the middle axle and rear axle assembly 20 in this application requires less interior space, reduces the overall weight of the vehicle and manufacturing cost, and at the same time, the drive axle 1 in this application requires fewer transmission components, thus improving transmission efficiency.

[0038] The coupling 100 includes a first connecting gear 110, a second connecting gear 120, and a planetary gear set 130. The first connecting gear 110 is located at the first end 101 of the coupling 100, and connects to and follows the movement of the first input member 12. Specifically, the first connecting gear 110 has an internal tooth portion 111 that meshes with the teeth on the outer side of the end of the first input member 12. The second connecting gear 120 is located at the second end 102 of the coupling 100, and connects to the transmission assembly 30, transmitting the movement of the first input member 12 to the transmission assembly 30. Specifically, the second connecting gear 120 has an internal tooth portion 121 that meshes with the teeth of the transmission assembly 30. A planetary gear set 130 is disposed between the first end 101 and the second end 102. The planetary gear set 130 connects the first connecting gear 110 and the second connecting gear 120, enabling the transmission of motion from the first connecting gear 110 to the second connecting gear 120. Furthermore, the planetary gear set 130 constitutes the support structure of the coupling 100. A transmission cavity 103 is formed in the middle of the planetary gear set 130, and the first connecting gear 110 and the second connecting gear 120 are respectively disposed at both ends of the transmission cavity 103. By providing a coupling 100 with a transmission cavity 103, the coupling 100 can be disposed between the wheel axle 13, the transmission assembly 30, and the first input component 12, making it possible to coaxially configure the middle axle assembly 10 and the rear axle assembly 20, saving space in the middle axle assembly 10, and improving transmission efficiency.

[0039] like Figure 3 As shown, the planetary gear set 130 includes a planet carrier, planetary gears 133, and a planetary gear shaft 134 connecting the planet carrier and planetary gears 133. The planet carrier is connected to a first connecting gear 110 and a second connecting gear 120. The planetary gears 133 are connected to the planet carrier via the planetary gear shaft 134 and are located on both sides of the transmission cavity 103. The first connecting gear 110 has external teeth 112 formed on its exterior, and one end of the planetary gear 133 meshes with the external teeth 112 of the first connecting gear 110. The second connecting gear 120 has external teeth 122 formed on its exterior, and the other end of the planetary gear 133 meshes with the external teeth 122 of the second connecting gear 120. Through the planetary gear set 130, motion is transmitted from the first connecting gear 110 to the second connecting gear 120.

[0040] The planetary carrier includes a first planetary carrier 131 and a second planetary carrier 132, which are fixedly connected. The first planetary carrier 131 and the second planetary carrier 132 have similar structures and can be arranged symmetrically. The first planetary carrier 131 and the second planetary carrier 132 are fixedly connected by a pin 138. By arranging the first planetary carrier 131 and the second planetary carrier 132, the various structures of the planetary gear set 130 are easier to install.

[0041] Specifically, the first planetary carrier 131 is provided with a first connecting portion 1312 and a first base portion 1311. The first base portion 1311 has a first connecting hole 1313 and a second connecting hole 1314. In this embodiment, multiple first connecting portions 1312 are provided, each used to limit multiple corresponding planetary gears 133. Specifically, the number of first connecting portions 1312 is greater than the number of planetary gears 133, and the planetary gears 133 are located between adjacent first connecting portions 1312. A planetary gear shaft 134 passes through the planetary gears 133. One end of the planetary gear 133 is connected to the first base portion via the planetary gear shaft 134. One end of the planetary gear shaft 134 is connected to the first connecting hole 1313, and the other end of the planetary gear shaft 134 is connected to the corresponding structure of the second planetary carrier 132. The second connecting hole 1314 is used to connect the first connecting gear 110. A bearing is provided between the second connecting hole 1314 and the first connecting gear 110, and a bearing is provided between the planetary gear shaft 134 and the first connecting hole 1313. In this embodiment, the bearing can be a needle roller bearing, which has a smaller thickness and occupies less space. A gasket is provided between the end of the planetary gear shaft 134 and the first base portion 1311, and a gasket is provided between the first connecting gear 110 and the base portion. The gaskets can make the connection tighter and prevent wear between the structures.

[0042] Specifically, the second planetary carrier 132 is provided with a second connecting portion 1322 and a second base portion 1321. The second base portion 1321 has a third connecting hole 1323 and a fourth connecting hole 1324. In this embodiment, multiple second connecting portions 1322 are provided, each used to limit multiple corresponding planetary gears 133. Specifically, the number of second connecting portions 1322 is greater than the number of planetary gears 133, and the number of second connecting portions 1322 corresponds to the number of first connecting portions 1312. Planetary gears 133 are disposed between adjacent second connecting portions 1322. A planetary gear shaft 134 passes through the planetary gear 133, and one end of the planetary gear 133 is drivenly connected to the second base portion 1321 via the planetary gear shaft 134. Specifically, one end of the planetary gear shaft 134 is connected to the third connecting hole 1323, and the other end of the planetary gear shaft 134 is connected to a corresponding structure of the first planetary carrier 131. The fourth connecting hole 1324 is used to connect the first connecting gear 110. A bearing is provided between the fourth connecting hole 1324 and the first connecting gear 110, and a bearing is provided between the planetary gear shaft 134 and the third connecting hole 1323. In this embodiment, the bearing can be a needle roller bearing, which has a smaller thickness and occupies less space. A gasket is provided between the end of the planetary gear shaft 134 and the second base portion 1321, and a gasket is provided between the second connecting gear 120 and the base portion. The gaskets can make the connection tighter and prevent wear between the structures.

[0043] In this embodiment, the first connecting hole 1313, the second connecting hole 1314, the third connecting hole 1323, and the fourth connecting hole 1324 are all through holes penetrating the first base portion 1311 or the second base portion 1321. In other embodiments, the first connecting hole 1313 and the third connecting hole 1323 can be a groove-shaped structure, and correspondingly, the two ends of the planetary gear shaft 134 can abut against and connect to the groove-shaped structure.

[0044] In this embodiment, the first planetary carrier 131 and the second planetary carrier 132 have different heights. Furthermore, the first connecting portion 1312 and the second connecting portion 1322 have different lengths. The first connecting portion 1312 and the second connecting portion 1322 are respectively disposed at the edges of the first base portion 1311 and the second base portion 1321, and the first connecting portion 1312 and the second connecting portion 1322, together with the first base portion 1311 and the second base portion 1321, together form the transmission cavity 103.

[0045] In this embodiment, the first planetary carrier 131 has four first connecting portions 1312, and the second planetary carrier 132 has four second connecting portions 1322. Each first connecting portion 1312 of the first planetary carrier 131 is connected to the corresponding connecting portion of the second planetary carrier 132. The connected planetary carrier is divided into four openings by the connecting portions, and the openings communicate with the transmission cavity 103 or serve as part of the transmission cavity 103. There are two planetary gears 133, which are respectively arranged in two opposite openings along the second direction. The remaining two openings and the transmission cavity 103 are for the wheel axle 13 to pass through. The second direction is perpendicular to the first direction and perpendicular to the direction of the first axis 10a.

[0046] In other embodiments, the connecting portion of the planetary carrier and the planetary gear 133 may be of other quantities, at least forming two openings opposite each other along the central axis 10b and a transmission cavity 103 connecting the two openings. The planetary gear 133 may be of other structures, as long as it can transmit motion from the first connecting gear 110 to the second connecting gear 120 without obstructing the wheel axle from passing through the transmission cavity 103.

[0047] Furthermore, the first connecting gear 110 has an internal tooth portion 111 and an external tooth portion 112. Similarly, the second connecting gear 120 has an internal tooth portion 121 and an external tooth portion 122. The internal tooth portions (111, 121) of the first connecting gear 110 and the second connecting gear 120 are respectively connected to the first input member 12 and the transmission assembly 30, and the external tooth portions (112, 122) of the first connecting gear 110 and the second connecting gear 120 are respectively connected to both ends of the planetary gear 133. Furthermore, the first connecting gear 110 also has a nested portion 113 on its exterior, which is connected to and passes through the second connecting hole 1314. Furthermore, the second connecting gear 120 also has a nested portion 123 on its exterior, which is connected to and passes through the fourth connecting hole 1324. After the first connecting gear 110 is connected to the first planetary carrier 131, the outer tooth portion 111 of the first connecting gear 110 is located between the first base portion 1311 and the second base portion 1321. After the second connecting gear 120 is connected to the second planetary carrier 132, the outer tooth portion of the second connecting gear 120 is located between the first base portion and the second base portion.

[0048] The planetary gear 133 includes a body portion 1332 and a meshing portion 1331. The body portion 1332 is fitted onto the outside of the planetary gear shaft 134, and a connecting hole is formed inside the body portion 1332. The planetary gear shaft 134 passes through the connecting hole, allowing the planetary gear 133 to connect to the planet carrier. The meshing portion 1331 is a gear formed at both ends of the body portion 1332. The meshing portions 1331 at both ends mesh with the first connecting gear 110 and the second connecting gear 120, respectively, so that the movement of the first input member 12 is transmitted to the transmission assembly 3030 through the first connecting gear 110 and the second connecting gear 120. Specifically, the meshing portion 1331 is integrally formed with the body portion 1332, and the meshing portion 1331 can be recessed at both ends of the body portion 1332 or protruding at both ends of the body portion 1332.

[0049] The first planetary carrier 131 has a first fixing hole 1315, and the second planetary carrier 132 has a second fixing hole 1325. Specifically, the first fixing hole 1315 passes through the first connecting portion 1312 and the first base portion 1311, and the second fixing hole 1325 passes through the second connecting portion 1322 and the second base portion 1321. When the first planetary carrier and the second planetary carrier are connected, the first fixing hole 1315 and the second fixing hole 1325 are aligned to form a fixing hole passing through the planetary carrier. The coupling 100 also includes a plurality of fixing shafts 135, which pass through the first fixing hole 1315 and the second fixing hole 1325 respectively, fixing the connector to the differential 14. In this embodiment, the fixing hole is located at the edge of the planetary carrier, so that the fixing shaft 135 passes through the first and second connecting portions without passing through the transmission cavity 103. The fixing shaft 135 does not affect the movement of the planetary gear 133, and also makes full use of the space of the coupling 100. In other embodiments, the fixing hole and the fixing shaft 135 may not be provided in the first and second connecting portions.

[0050] Furthermore, the differential 14 includes a housing 141, a differential assembly 142 disposed within the housing 141, and a second bevel gear 143. The differential assembly 142 connects to the wheel axle, and the housing 141 covers at least a portion of the wheel axle. In this embodiment, a portion of the housing 141 and the wheel axle pass through the transmission cavity, and a fixed shaft 135 is fixedly connected to the housing 141 passing through the transmission cavity. Specifically, the fixed shaft 135 is a bolt, and correspondingly, the first fixing hole 1315 and the second fixing hole 1325 are threaded holes capable of connecting the fixed shaft 135, and the housing 141 also has threaded holes capable of connecting the fixed shaft 135.

[0051] The rear axle assembly 20 is connected to the middle axle assembly 10 via a transmission assembly. The rear axle assembly 20 can also actively output driving force to the corresponding wheels (not shown in the figure). A differential (not shown in the figure) for adjusting the movement of the rear axle assembly 20 and the middle axle assembly 10 can also be provided. The rear axle assembly 20 includes a second driving member 21 arranged along the first axis 10a, that is, the middle axle assembly 10 and the rear axle assembly 20 are coaxially arranged. Further, the second driving member 21 is coaxially arranged with the first bevel gear 11, and the central axes of the second driving member 21 and the first bevel gear 11 both coincide with the first axis 10a. The rear axle assembly is connected to another wheel axle, and the connection between the rear axle assembly and this wheel axle is also provided with the same differential as that in the middle axle assembly.

[0052] The coupling 100 also includes a limiting member for limiting the position of the first connecting gear 110 or the second connecting gear 120 relative to the planetary gear set 130 along the first axis 10a. The limiting member includes a first limiting member 136 and a second limiting member 137. The first limiting member 136 limits the position of the first connecting gear 110 relative to the first planetary carrier 131 along the first axis 10a, and the second limiting member 137 limits the position of the second connecting gear 120 relative to the second planetary carrier 132 along the first axis 10a. In this embodiment, the limiting member is a retaining ring with a notch, which allows the retaining ring to engage at the connection between the first connecting gear 110 or the second connecting gear 120 and the planetary carrier. Specifically, the retaining ring engages between the nested portion (113, 123) of the first connecting gear 110 or the second connecting gear 120 and the planetary carrier to limit the position of the first connecting gear 110 or the second connecting gear 120. Furthermore, a shim is provided between the limiting member and the first connecting gear 110 or the second connecting gear 120, which can make the connection between the limiting member and the first connecting gear 110 or the second connecting gear 120 tighter.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A drive axle for a vehicle, characterized in that, The vehicle includes wheel axles, and the drive axle includes: The middle bridge assembly includes a first input element rotatable about a first axis; and Rear axle assembly; The middle axle assembly further includes a coupling disposed along the first axis, and the first input component is coaxially connected to the rear axle assembly through the coupling; The wheel axle passes through the coupling along a first direction and is connected to the first input component in a transmission manner; the first direction is arranged to intersect with the first axis. The coupling includes a first end, a second end, and a transmission cavity; the first end is connected to the first input component, and the second end is drively connected to the rear axle assembly; the transmission cavity is located between the first end and the second end, and the wheel axle passes through the transmission cavity along the first direction; The coupling includes a first connecting gear, a second connecting gear, and a planetary gear set; the first connecting gear is located at the first end and connected to the first input component; the second connecting gear is located at the second end and is connected to the rear axle assembly for transmission; the planetary gear set is connected to the first connecting gear and the second connecting gear respectively, and the transmission cavity extends through the planetary gear set along the first direction.

2. The drive axle of the vehicle according to claim 1, characterized in that, The middle axle assembly also includes a first bevel gear and a differential; the first bevel gear is sleeved on the outside of the first input component; the differential is connected to one end of the wheel axle that extends out of the coupling, and the differential includes a second bevel gear that meshes with the first bevel gear.

3. The drive axle of the vehicle according to claim 1, characterized in that, The planetary gear set includes: Planetary carrier, connecting the first connecting gear and the second connecting gear; A planetary gear is connected to the planet carrier. One end of the planetary gear meshes with the first connecting gear, and the other end meshes with the second connecting gear. At least two planetary gears are provided, and the two planetary gears are respectively provided on opposite sides of the planet carrier along a second direction, which is perpendicular to the first direction.

4. The drive axle of the vehicle according to claim 3, characterized in that, The planetary gear includes a body and a meshing part. The body is connected to the planet carrier, and the meshing part is located at both ends of the body and meshes with the first connecting gear and the second connecting gear, respectively.

5. The drive axle of the vehicle according to claim 4, characterized in that, The main body is provided with a connecting hole, and the planetary gear set also includes a planetary gear shaft passing through the connecting hole. The planetary gear is connected to the planet carrier through the planetary gear shaft.

6. The drive axle of the vehicle according to claim 3, characterized in that, The planetary carrier includes a first planetary carrier and a second planetary carrier, which are fixedly connected.

7. The drive axle of the vehicle according to claim 6, characterized in that, The first planetary carrier and the second planetary carrier have different heights.

8. The drive axle of the vehicle according to claim 1, characterized in that, A bearing is provided between the first connecting gear and the planetary gear set; and / or A bearing is provided between the second connecting gear and the planetary gear set.

9. The drive axle of the vehicle according to claim 1, characterized in that, The coupling also includes a limiting member for limiting the position of the first connecting gear or the second connecting gear relative to the planetary gear set along the first axis.

10. A vehicle, characterized in that, The drive axle as described in any one of claims 1 to 9 is provided.

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