CN110962507A

CN110962507A - Drive axle and vehicle with same

Info

Publication number: CN110962507A
Application number: CN201811161702.2A
Authority: CN
Inventors: 戴双建; 全初鹏; 刘辉跃
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2018-09-30
Filing date: 2018-09-30
Publication date: 2020-04-07
Anticipated expiration: 2038-09-30
Also published as: CN110962507B

Abstract

The invention discloses a drive axle and a vehicle with the same, wherein the drive axle comprises: the axle housing assembly, motor, planetary reduction gear and differential mechanism. The motor includes a motor shaft and a motor housing. The planetary speed reducer comprises an inner gear ring, a sun gear, a planetary gear set and a planet carrier, wherein the inner gear ring is fixed on the axle housing assembly; the sun wheel is connected with the motor shaft to be driven by the motor to rotate, the planetary wheel set comprises a first planetary wheel, a second planetary wheel and a connecting shaft which rotate coaxially, the first planetary wheel is meshed with the sun wheel, the second planetary wheel is meshed with the inner gear ring, and the planetary carrier is connected with the connecting shaft to be driven by the connecting shaft to rotate. The differential mechanism is arranged on the axle housing assembly and comprises a differential mechanism shell and two half axle gears, the differential mechanism shell and the planet carrier are integrally formed, the two half axle gears are respectively connected with two wheel end half axles, and one of the wheel end half axles penetrates through the motor shaft. The drive axle disclosed by the invention is compact in structure, and can realize light-weight design of the drive axle and save assembly space.

Description

Drive axle and vehicle with same

Technical Field

The invention relates to the technical field of vehicles, in particular to a drive axle and a vehicle with the same.

Background

In the related art, a drive axle arranged in a vehicle is large in volume and weight, so that not only is assembly inconvenient, but also the assembly space occupied by the drive axle during installation is large, so that the assembly difficulty of other parts in the vehicle is increased, the arrangement form of a drive system of the vehicle is also complex, and the transmission efficiency of the drive system is greatly reduced.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. To this end, it is an object of the invention to propose a drive axle which has the advantage of being compact.

The invention also provides a vehicle provided with the drive axle.

The drive axle according to the embodiment of the invention comprises: an axle housing assembly; the motor comprises a motor shaft and a motor shell, the motor shaft is a hollow shaft, and the motor shell is fixed on the axle housing assembly; the planetary reduction gear is arranged on the axle housing assembly and comprises an inner gear ring, a sun gear, a planetary gear set and a planet carrier, and the inner gear ring is fixed on the axle housing assembly; the sun wheel is connected with the motor shaft to be driven by the motor to rotate, the planetary wheel set comprises a first planetary wheel, a second planetary wheel and a connecting shaft, the connecting shaft is respectively connected with the first planetary wheel and the second planetary wheel to enable the first planetary wheel and the second planetary wheel to be coaxially driven, the first planetary wheel is meshed with the sun wheel, the second planetary wheel is meshed with the inner gear ring, and the planetary carrier is connected with the connecting shaft to be driven by the connecting shaft to rotate; differential mechanism, differential mechanism establishes on the axle housing assembly, differential mechanism includes differential mechanism casing and two side gear, differential mechanism casing and two the side gear cooperation is in order to drive two side gear rotates, differential mechanism casing with the planet carrier is integrated into one piece, two side gear links to each other with two wheel end semi-axles respectively, one of them the wheel end semi-axle passes the motor shaft.

According to the drive axle provided by the embodiment of the invention, the planet carrier in the planetary reduction gear and the differential shell of the differential are arranged into an integrated piece, so that the matching structure of the planetary reduction gear and the differential is more compact, the integral structure of the drive axle is more compact, the light weight and function integrated design of the drive axle is realized, and the assembly space of the chassis is greatly saved.

According to some embodiments of the present invention, the axle housing assembly includes a first portion and a second portion, the first portion and the second portion being disposed on respective axial sides of the motor casing; the drive axle further comprises a connecting piece, the connecting piece penetrates through the motor shell, and two ends of the connecting piece are respectively connected with the first portion and the second portion.

In some embodiments of the present invention, both ends of the connecting member in the axial direction are provided with external threads and penetrate through the first portion and the second portion respectively to be matched with corresponding fixing nuts.

In some embodiments of the present invention, one end of the connecting member in the axial direction is provided with a stop portion which stops against an outer peripheral wall of one of the first portion and the second portion, and the other end of the connecting member in the axial direction is provided with an external thread and passes through the other of the first portion and the second portion to be fitted with a fixing nut.

According to some embodiments of the invention, the differential further comprises: differential gear and at least one first gasket that transmission shaft, two intervals set up, the transmission shaft with the differential casing links to each other, two differential gear wears to establish in order by on the transmission shaft drive rotates, two side gear is located the both sides of transmission shaft, every side gear is simultaneously with two differential gear meshes with by two differential gear drive rotates, first gasket is worn to establish on the transmission shaft and is located differential gear is close to the one end of differential casing, first gasket orientation differential gear is equipped with first oil guide hole on the surface.

In some embodiments of the present invention, the differential further includes at least one second gasket, the second gasket is disposed on the wheel-end half shaft and located at an end of the side gear away from the transmission shaft, and a second oil guiding hole is disposed on an end surface of the second gasket facing the side gear.

In some embodiments of the present invention, the transmission shaft is provided with at least one oil guide groove extending in an axial direction of the transmission shaft.

According to some embodiments of the invention, the connecting shaft is provided with an oil inlet passage, and the oil inlet passage is used for introducing lubricating oil in a cavity of the axle housing assembly into the planetary reduction gear.

In some embodiments of the present invention, the planetary reduction gear further includes an oil guide plate, the oil guide plate is disposed on the planet carrier, and at least a portion of the oil guide plate faces the oil inlet channel to guide the lubricating oil into the oil inlet channel.

According to some embodiments of the invention, the drive axle further comprises: the motor shaft is provided with a first spline, the sun gear is provided with a second spline, and the spline housing is matched with the first spline and the second spline to be connected with the motor shaft and the sun gear respectively.

According to some embodiments of the invention, the connecting shaft is fixedly connected with the planet carrier, and the first planet wheel and the second planet wheel are respectively in key connection with the connecting shaft.

In some embodiments of the invention, the first planet wheel and the second planet wheel are integrally formed, and the first planet wheel and the second planet wheel are respectively in spline connection with the connecting shaft.

In some embodiments of the invention, the connecting shaft and the planet carrier are integrally formed.

According to some embodiments of the invention, a first bearing is disposed between the sun gear and the differential case.

According to some embodiments of the invention, the outer peripheral wall of the inner gear ring is provided with a first matching groove, the inner peripheral wall of the axle housing assembly is provided with a second matching groove, the first matching groove and the second matching groove are matched to form a matching hole, and the drive axle further comprises a fixing piece, wherein the fixing piece is in interference fit with the matching hole.

In some embodiments of the present invention, a cross section of the first fitting groove and a cross section of the second fitting groove are each formed in a semicircular shape, and the fixing member is a cylindrical pin.

In some embodiments of the present invention, the first fitting grooves are a plurality of first fitting grooves, the plurality of first fitting grooves are distributed at intervals in the circumferential direction of the ring gear, and the inner circumferential wall of the axle housing assembly is provided with a plurality of second fitting grooves corresponding to the first fitting grooves one to one.

A vehicle according to an embodiment of the invention comprises a transaxle according to the above-described embodiment of the invention.

According to the vehicle provided by the embodiment of the invention, the drive axle is arranged, the planetary reduction gear and the differential mechanism are arranged in the drive axle, and the planetary carrier in the planetary reduction gear and the differential mechanism shell of the differential mechanism are integrally formed, so that the matching structure of the planetary reduction gear and the differential mechanism is more compact, the integral structure of the drive axle is more compact, the light weight and function concentration integrated design of the drive axle is realized, the integral structure of the vehicle is more compact, and the production cost is saved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of the overall structure of a transaxle according to an embodiment of the present invention;

FIG. 2 is a top view of a drive axle according to an embodiment of the present invention;

FIG. 3 is a front view of a transaxle according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a partial enlarged view of a portion encircled by B in FIG. 4;

FIG. 6 is an enlarged view of a portion encircled by C in FIG. 4;

FIG. 7 is an enlarged view of a portion of FIG. 4 encircled at D;

FIG. 8 is a transmission schematic of a transaxle according to an embodiment of the present invention;

fig. 9 is an overall structural view of a motor according to an embodiment of the present invention;

FIG. 10 is a half sectional view of a mating structure of a planetary reduction gear and a differential according to an embodiment of the invention;

FIG. 11 is a full sectional view of a mating structure of a planetary reduction gear and a differential according to an embodiment of the invention;

FIG. 12 is an enlarged partial view of the circled portion E in FIG. 11;

FIG. 13 is a schematic structural view of a differential according to an embodiment of the present invention;

FIG. 14 is an exploded view of a differential according to an embodiment of the present invention;

fig. 15 is a schematic view of a matching structure of a drive axle and a frame according to an embodiment of the invention.

Reference numerals:

the drive axle 100 is driven by a motor,

the axle housing assembly 1, the first section 11, the second section 12, the mounting seat 13,

a motor 2, a motor shaft 21, a motor shell 22, a liquid inlet port 23, a liquid outlet port 24,

the planetary reduction gear 3, the ring gear 31, the first mating groove 31a, the sun gear 32, the planetary gear set 33, the first planetary gear 331, the second planetary gear 332, the connecting shaft 333, the oil inlet channel 333a, the planetary carrier 34, the first bearing 35, the oil guide plate 36,

the differential 4, the differential case 41, the side gear 42, the propeller shaft 43, the oil guide groove 43a, the differential gear 44, the first spacer 45, the first oil guide hole 45a, the second spacer 46, the second oil guide hole 46a,

the wheel end half shaft 5, the half shaft sleeve 51,

the length of the connecting piece 6, the fixing nut 61,

the spline housing 7 is provided with a spline groove,

the second bearing (8) is mounted on the shaft,

the fixing member (9) is provided with a fixing part,

a hub assembly 101, a fixing bolt 101a, a positioning nut 101b, a stop washer 101c,

a brake assembly 102, an ABS sensor assembly 102a, a sensor head 102b,

the vibration damper (103) is provided with a vibration damper,

a vehicle frame 200.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A transaxle 100 according to an embodiment of the present invention, which transaxle 100 may be used in a vehicle, is described below with reference to fig. 1 to 15.

As shown in fig. 1 to 4, a transaxle 100 according to an embodiment of the present invention includes: the axle housing assembly comprises an axle housing assembly 1, a motor 2, a planetary reduction gear 3 and a differential mechanism 4.

As shown in fig. 4, the motor 2 may include a motor shaft 21 and a motor housing 22, the motor shaft 21 may be formed as a hollow shaft, and the motor housing 22 may be fixed to the axle housing assembly 1. In the specific example shown in fig. 9, the motor casing 22 may further include an inlet port 23 and an outlet port 24, and the motor casing 22 has a cooling flow path therein. The cooling liquid can enter the motor shell 22 through the liquid inlet interface 23, and the cooling liquid can circulate in the cooling flow path, so that the motor 2 can be cooled, the working temperature of the motor 2 can be reduced, and the normal operation of the motor 2 can be ensured. Finally, the cooling liquid after heat exchange can flow out through the liquid outlet port 24.

As shown in fig. 4 and 11, the planetary reduction device 3 may be provided on the axle housing assembly 1, and the planetary reduction device 3 may include an annular gear 31, a sun gear 32, a planetary gear set 33, and a carrier 34.

Wherein, the ring gear 31 can be fixed on the axle housing assembly 1. The sun gear 32 may be connected to the motor shaft 21 to be driven by the motor 2 to rotate, the planetary gear set 33 may include a first planetary gear 331, a second planetary gear 332, and a connecting shaft 333, the connecting shaft 333 may be connected to the first planetary gear 331 and the second planetary gear 332 respectively to coaxially drive the first planetary gear 331 and the second planetary gear 332, the first planetary gear 331 may be engaged with the sun gear 32, the second planetary gear 332 may be engaged with the ring gear 31, and the planet carrier 34 may be connected to the connecting shaft 333 to rotate by the connecting shaft 333.

Specifically, when the planetary reduction gear 3 is operated, the motor 2 can drive the sun gear 32 to rotate, and the first planetary gear 331 is meshed with the sun gear 32 and can be driven to rotate by the sun gear 32. Because the first planet wheel 331 and the second planet wheel 332 rotate coaxially, the first planet wheel 331 can drive the second planet wheel 332 to rotate simultaneously when rotating, and the second planet wheel 332 is meshed with the inner gear ring 31 when rotating. Thus, the first planetary gear 331 and the second planetary gear 332 can revolve around the sun gear 32 while rotating on their own axes, and the first planetary gear 331 and the second planetary gear 332 can rotationally drive the carrier 34 via the connecting shaft 333 while revolving.

As shown in fig. 8, the planetary reduction gear 3 in the present invention may be an NW type planetary reduction gear. Wherein the number of teeth of the sun gear 32 is Z₁The number of teeth of the first planetary gear 331 is Z₂The number of teeth of the second planetary gear 332 is Z₃The number of teeth of the ring gear 31 is Z₄Transmission ratio of the planetary reduction gear 3

The value range of the transmission speed ratio i of the planetary reduction gear 3 can be as follows: i is more than or equal to 7 and less than or equal to 21.

Therefore, through the arrangement, the transmission speed ratio of the planetary speed reducing device 3 is large, and the single planetary speed reducing device 3 can meet the speed reducing requirement of the drive axle 100, so that the transmission efficiency of the drive axle 100 can be improved, the transmission chain of the drive axle 100 can be shortened, and the whole structure of the drive axle 100 is more compact.

As shown in fig. 4, 10-11, the differential 4 may be disposed on the axle housing assembly 1, the differential 4 may include a differential case 41 and two side gears 42, the differential case 41 may be integrally formed with the carrier 34, and the two side gears 42 may be respectively connected to two wheel-end half shafts 5, one of the wheel-end half shafts 5 may pass through the motor shaft 21.

Specifically, the planetary carrier 34 in the planetary reduction gear 3 may be connected to the differential case 41 to drive the differential case 41 to rotate, the differential case 41 may drive the two side gears 42 to rotate, and the two side gears 42 may transmit power to the hub assembly 101 connected thereto through the corresponding wheel-end half shafts 5, thereby driving the vehicle to move forward. When the vehicle turns or runs on an uneven road surface, the differential 4 can enable the hub assemblies 101 on the left side and the right side of the vehicle body to have different rotating speeds, so that the hub assemblies 101 on the left side and the right side can be guaranteed to do pure rolling motion, the wheels can be prevented from slipping, and the vehicle can run more stably.

It can be understood that the differential case 41 and the planet carrier 34 are integrally formed, so that the whole structure of the drive axle 100 is simpler, and a special connecting structure is not required to be arranged between the differential case 41 and the planet carrier 34 to transmit the driving force, so that the assembly error between the planet carrier 34 and the differential case 41 can be reduced, the matching precision between the planetary reduction gear 3 and the differential 4 can be improved, and the working noise of the drive axle 100 can be greatly reduced. Moreover, by providing the differential case 41 and the carrier 34 as an integrally formed member, the fitting structure of the planetary reduction gear 3 and the differential 4 can be made more compact, and the assembly space can be saved, whereby the entire structure of the transaxle 100 can be made more compact, and the lightweight and function-concentrated integrated design of the transaxle 100 can be realized. In the specific example shown in fig. 10 to 11, the differential 4 includes: a differential case 41, a propeller shaft 43, two differential gears 44, and two side gears 42. The differential case 41 and the carrier 34 in the planetary reduction gear 3 are formed as an integral part, and the propeller shaft 43 is connected to the differential case 41 so as to be driven by the differential case 41 to rotate. Two differential gears 44 are inserted through the transmission shaft 43, and the two differential gears 44 are horizontally disposed and vertically spaced apart from each other. Two side gears 42 are vertically disposed, and each side gear 42 is engaged with two differential gears 44, respectively. When the vehicle is traveling in a straight line, the transmission shaft 43 may drive the two differential gears 44 to revolve, and the two differential gears 44 may drive the two side gears 42 to rotate so as to transmit power to the corresponding hub assemblies 101 through the wheel-end half shafts 5. When the vehicle turns, the hub assemblies 101 on both sides of the vehicle body generate two additional forces in opposite directions due to different resistances, and the additional forces can be transmitted to the corresponding side gears 42 through the wheel-end half shafts 5, so that the two differential gears 44 can be forced to rotate around the transmission shaft 43, the rotation speed of the side gear 42 corresponding to the hub assembly 101 on the inner side of the vehicle body is reduced, the rotation speed of the side gear 42 corresponding to the hub assembly 101 on the outer side of the vehicle body is increased, and the rotation speeds of the hub assemblies 101 on both sides of the vehicle body can be different.

In the specific example shown in fig. 3 to 4, both the wheel-end half shafts 5 extend in the left-right direction, wherein the left-hand wheel-end half shaft 5 is connected to the left-hand wheel hub assembly 101 through the hollow motor shaft 21 by the fixing bolt 101a, and the right-hand wheel-end half shaft 5 is connected to the right-hand wheel hub assembly 101 by the fixing bolt 101 a. As shown in fig. 6, the hub assemblies 101 on the left and right sides are axially locked by the stop washer 101c and the positioning nut 101 b. Therefore, through the arrangement, the axle housing assembly 1 and the motor 2 can be coaxially arranged, and the whole structure of the drive axle 100 can be more compact.

According to the drive axle 100 of the embodiment of the invention, the planet carrier 34 in the planetary reduction gear 3 and the differential case 41 of the differential 4 are arranged as an integral molding piece, so that the matching structure of the planetary reduction gear 3 and the differential 4 can be more compact, the whole structure of the drive axle 100 can be more compact, the light weight and function concentration integrated design of the drive axle 100 can be realized, and the assembly space of a chassis is greatly saved.

As shown in fig. 10, 12-13, the differential 4 may further include, according to some embodiments of the present invention: the transmission shaft 43, two differential gears 44 arranged at intervals and at least one first gasket 45, wherein the transmission shaft 43 can be connected with the differential case 41, the two differential gears 44 can be arranged on the transmission shaft 43 in a penetrating way to be driven by the transmission shaft 43 to rotate, the two side gears 42 can be arranged on two sides of the transmission shaft 43, each side gear 42 is simultaneously meshed with the two differential gears 44 to be driven by the two differential gears 44 to rotate, the first gasket 45 can be arranged on the transmission shaft 43 in a penetrating way and is arranged at one end of the differential gear 44 close to the differential case 41, and the surface of the first gasket 45 facing the differential gear 44 can be provided with a first oil guide hole 45 a.

Specifically, the transmission shaft 43 may be rotated by the transmission shaft 43 together with the differential case 41, and the transmission shaft 43 may drive the two differential gears 44 to revolve along with it. Since the two side gears 42 are meshed with the two differential gears 44, the two side gears 42 can be driven to rotate when the two differential gears 44 revolve, and the wheel-end half shafts 5 can rotate synchronously with the corresponding side gears 42. Thus, the differential 4 can transmit power to the hub assembly 101 through the two wheel end half shafts 5. When the rotation speeds of the hub assemblies 101 on the two sides of the vehicle body are different, the wheel-end half shafts 5 can drive the two differential gears 44 to rotate through the corresponding side gears 42, and the two differential gears 44 can rotate around the transmission shaft 43.

A first spacer 45 may be provided between the differential gear 44 and the differential case 41, whereby wear between the differential gear 44 and the differential case 41 may be reduced. Moreover, the first oil guide hole 45a of the first spacer 45 can guide the lubricating oil, and the lubricating oil in the differential 4 can be guided into the differential gear 44, so that a good lubricating effect can be achieved, the operation of the differential 4 can be smoother, the working noise of the differential 4 can be reduced, and the service life of the differential 4 can be prolonged.

Alternatively, a first spacer 45 may be provided at an end of one of the differential gears 44 close to the differential case 41, or a first spacer 45 may be provided at an end of both the differential gears 44 close to the differential case 41. Alternatively, the first oil guide hole 45a may be plural, and the plural first oil guide holes 45a may be spaced apart in the circumferential direction of the first gasket 45.

As shown in fig. 13-14, in some embodiments of the present invention, the differential 4 may further include at least one second spacer 46, the second spacer 46 may be disposed through the wheel-end half shaft 5 and located at an end of the side gear 42 away from the transmission shaft 43, and a second oil guide hole 46a may be formed in an end surface of the second spacer 46 facing the side gear 42. That is, the second spacer 46 may be provided at an end of one of the side gears 42 remote from the propeller shaft 43, or the second spacer 46 may be provided at an end of both the side gears 42 remote from the propeller shaft 43. The second oil guide hole 46a of the second spacer 46 may also serve to guide the lubricating oil, so as to guide the lubricating oil in the differential 4 into the side gear 42, thereby achieving a good lubricating effect, and not only enabling the differential 4 to operate more smoothly and reducing the operating noise of the differential 4, but also prolonging the service life of the differential 4.

As shown in fig. 14, in some embodiments of the present invention, at least one oil guide groove 43a may be provided on the propeller shaft 43, and the oil guide groove 43a may extend in an axial direction of the propeller shaft 43, thereby enhancing a lubricating effect of the differential 4. Specifically, the lubricating oil can flow through the oil guide groove 43a, and can lubricate the connection structure between the differential gear 44 and the propeller shaft 43, so that the differential gear 44 and the propeller shaft 43 can be operated more smoothly, and the operating noise of the differential 4 can be reduced.

The differential 4 according to the present invention is described in detail in one embodiment with reference to fig. 13-14.

The differential 4 includes: a differential case 41, a propeller shaft 43, two differential gears 44, two side gears 42, two first spacers 45, and two second spacers 46. The differential case 41 is connected to the carrier 34 and is formed as an integrally formed member with the carrier 34. The propeller shaft 43 is connected to the differential case 41 to be driven to rotate by the differential case 41. Two differential gears 44 are inserted through the transmission shaft 43, and the two differential gears 44 are horizontally disposed and vertically spaced apart from each other. Two side gears 42 are vertically disposed, each side gear 42 is engaged with two differential gears 44, and each side gear 42 is connected to a corresponding hub assembly 101 through a wheel-end half shaft 5. First spacers 45 are disposed at one ends of the two differential gears 44 close to the differential case 41, and a plurality of first oil guide holes 45a are disposed on each first spacer 45 and distributed at intervals in the circumferential direction of the first spacer. The ends of the two side gears 42, which are far away from the transmission shaft 43, are provided with second gaskets 46, and each second gasket 46 is provided with a plurality of second oil guide holes 46a which are distributed at intervals in the circumferential direction.

When the differential 4 is in operation, the planet carrier 34 can rotate synchronously with the differential case 41, thereby driving the transmission shaft 43 to rotate, and the transmission shaft 43 can drive the two differential gears 44 to revolve along with the transmission shaft 43. Since the two side gears 42 are meshed with the two differential gears 44, when the two differential gears 44 revolve, the two side gears 42 can be driven to rotate, and the wheel-end half shafts 5 can rotate synchronously with the corresponding side gears 42, so that the corresponding wheel hub assemblies 101 can be driven to rotate. The lubricating oil in the differential 4 can flow to the differential gear 44 through the first oil guide hole 45a on the first gasket 45, and the lubricating oil in the differential 4 can also flow to the side gear 42 through the second oil guide hole 46a on the second gasket 46, so that the lubricating effect of the differential 4 can be improved, the operation of the differential 4 can be smoother, the working noise of the differential 4 can be reduced, and the service life of the differential 4 can be prolonged.

When the vehicle is traveling in a straight line, the transmission shaft 43 may drive the two differential gears 44 to revolve, and the two differential gears 44 may drive the two side gears 42 to rotate so as to transmit power to the corresponding hub assemblies 101 through the wheel-end half shafts 5. When the vehicle turns, the hub assemblies 101 on both sides of the vehicle body generate two additional forces in opposite directions due to different resistances, and the additional forces can be transmitted to the corresponding side gears 42 through the wheel-end half shafts 5, so that the two differential gears 44 can be forced to rotate around the transmission shaft 43, the rotation speed of the side gear 42 corresponding to the hub assembly 101 on the inner side of the vehicle body is reduced, the rotation speed of the side gear 42 corresponding to the hub assembly 101 on the outer side of the vehicle body is increased, and the rotation speeds of the hub assemblies 101 on both sides of the vehicle body can be different.

As shown in fig. 11 to 12, according to some embodiments of the present invention, the connecting shaft 333 may be provided with an oil inlet passage 333a, and the oil inlet passage 333a may be used to introduce the lubricating oil in the cavity of the axle housing assembly 1 into the planetary reduction gear 3, so that the operation of the planetary reduction gear 3 may be smoother, and the operating noise of the planetary reduction gear 3 may be reduced. Alternatively, a hollow space may be provided in the connecting shaft 333 to form the oil-feeding passage 333a, and the oil-feeding passage 333a may be provided on the outer circumferential wall of the connecting shaft 333. The oil inlet passage 333a may extend horizontally in the axial direction of the connecting shaft 333, and the oil inlet passage 333a may also extend in a meandering manner on the outer peripheral wall of the connecting shaft 333, and may be selectively provided according to actual use requirements, which is not particularly limited in the present invention.

As shown in fig. 12, in some embodiments of the present invention, the planetary reduction device 3 may further include an oil guide plate 36, the oil guide plate 36 may be provided on the carrier 34, and at least a portion of the oil guide plate 36 may be opposite to the oil inlet passage 333a to guide the lubricating oil into the oil inlet passage 333a, so that the flow rate of the lubricating oil in the oil inlet passage 333a may be increased. For example, the bottom of the axle housing assembly 1 may be provided with an oil sump for containing lubricating oil. When the planetary reduction gear 3 is operated, the carrier 34 can drive the oil guide plate 36 to rotate. When the oil guide plate 36 rotates, a part of the oil guide plate 36 may extend below the liquid level of the lubricating oil in the oil pool, and the lubricating oil may flow into the oil inlet passage 333a along the oil guide plate 36 under the action of centrifugal force.

As shown in fig. 3 to 4, according to some embodiments of the present invention, the axle housing assembly 1 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 may be respectively disposed at two axial sides (left and right sides as shown in fig. 3 to 4) of the motor housing 22, the drive axle 100 may further include a connecting member 6, the connecting member 6 may penetrate through the motor housing 22 and both ends of the connecting member 6 may be respectively connected with the first portion 11 and the second portion 12, thereby not only making the overall structure of the axle housing assembly 1 more compact, but also improving the assembly efficiency of the axle housing assembly 1.

Specifically, when the axle housing assembly 1 is assembled with the electric motor 2, the electric motor 2 can be disposed between the first portion 11 and the second portion 12 of the axle housing assembly 1, and the connecting member 6 can sequentially pass through the first portion 11, the electric motor 2 and the second portion 12 to connect the axle housing assembly 1 together. From this, through the aforesaid setting, can realize axle housing assembly 1 and the coaxial setting of motor 2, can make axle housing assembly 1 and motor 2's cooperation structure compacter. Moreover, the connecting piece 6 connects the axle housing assembly 1 and the motor 2 in a manner of penetrating through the motor housing 22 and the axle housing assembly 1, so that the assembly steps between the axle housing assembly 1 and the motor 2 can be simplified, and the assembly efficiency of the drive axle 100 can be greatly improved.

As shown in fig. 4 and 7, in some embodiments of the present invention, both ends (left and right ends as shown in fig. 4) of the connecting member 6 in the axial direction are provided with external threads and respectively penetrate through the first portion 11 and the second portion 12 to be engaged with the corresponding fixing nuts 61, thereby making the assembling manner of the connecting member 6 and the axle housing assembly 1 simpler and more convenient.

For example, as shown in fig. 4, the first portion 11 is located on the left side of the motor 2, the second portion 12 is located on the right side of the motor 2, the connecting member 6 is a stud, and the left and right ends of the connecting member 6 are provided with external threads. When the motor 2 is assembled with the axle housing assembly 1, the connecting piece 6 can pass through the first portion 11, the motor housing 22 and the second portion 12 from left to right or from right to left, and the left end and the right end of the connecting piece 6 are respectively in threaded connection with the fixing nuts 61, so that the axle housing assembly 1 and the motor 2 can be assembled together.

In some embodiments of the present invention, one end of the connecting member 6 in the axial direction may be provided with a stopping portion that may stop against the outer circumferential wall of one of the first portion 11 and the second portion 12, and the other end of the connecting member 6 in the axial direction may be provided with an external thread and pass through the other of the first portion 11 and the second portion 12 to be engaged with the fixing nut 61, whereby the assembling efficiency of the transaxle 100 may be further improved.

It is understood that the abutting portion may be provided at either end of the connecting member 6 in the axial direction. For example, when the stop portion is provided at the left end of the connecting member 6, the left end of the connecting member 6 can be stopped against the outer circumferential wall of the first portion 11 by the stop portion, the right end of the connecting member 6 can be engaged with the fixing nut 61 by a screw connection, and the fixing nut 61 is firmly stopped against the outer circumferential wall of the second portion 12 after being tightened. When the stopping part is arranged at the right end of the connecting piece 6, the right end of the connecting piece 6 can be stopped on the peripheral wall of the second part 12 by the stopping part, the left end of the connecting piece 6 can be matched with the fixing nut 61 in a threaded connection mode, and the fixing nut 61 is firmly stopped on the peripheral wall of the first part 11 after being screwed.

Alternatively, the abutting portion may be provided as an integrally formed member with the connecting member 6, whereby the connecting structure of the connecting member 6 and the abutting portion may be made more firm. Of course, the stopping part and the connecting piece 6 can also be formed as a single component, and the connecting piece 6 and the stopping part can be connected together by welding.

As shown in fig. 4 and 11, according to some embodiments of the present invention, the transaxle 100 may further include a spline housing 7, the motor shaft 21 may be provided with a first spline (not shown), the sun gear 32 may be provided with a second spline (not shown), and the spline housing 7 may be respectively engaged with the first spline and the second spline to connect the motor shaft 21 and the sun gear 32, so that the engagement structure of the sun gear 32 and the motor shaft 21 may be more compact. For example, the first spline and the second spline may be external splines, and the internal circumferential wall of the spline housing 7 may be provided with internal splines, so that when the spline housing 7 is engaged with the motor shaft 21 and the sun gear 32, the first spline and the second spline may be engaged with the internal splines at two axial ends of the spline housing 7, thereby reducing the occupied space of the engagement structure between the sun gear 32 and the motor shaft 21.

It will of course be appreciated that one of the first and second splines may be provided as an internal spline and the other of the first and second splines may be provided as an external spline, and that the first and second splines may be directly connected in a keyed connection.

According to some embodiments of the present invention, the connecting shaft 333 may be fixedly connected to the planet carrier 34, and the first planet gears 331 and the second planet gears 332 may be respectively keyed to the connecting shaft 333, so that the assembly efficiency of the planetary reduction gear 3 may be improved. Specifically, when the planetary gear set 33 is assembled with the carrier 34, the first planetary gear 331 and the second planetary gear 332 may be respectively connected with the connecting shaft 333 in a splined manner.

When the planetary reduction gear 3 is in operation, the sun gear 32 can drive the first planet gear 331 to rotate, and the first planet gear 331 can drive the second planet gear 332 to rotate around the connecting shaft 333. While the second planet gears 332 are in meshing engagement with the ring gear 31, the first planet gears 331, the second planet gears 332, and the connecting shaft 333 can revolve around the sun gear 32.

Alternatively, the connecting shaft 333 may be formed as an integrally formed member with the carrier 34, whereby the structure of the planetary reduction gear 3 can be made simpler and easier to assemble.

In some embodiments of the present invention, the first planet gear 331 and the second planet gear 332 may be integrally formed, and the first planet gear 331 and the second planet gear 332 may be respectively spline-connected to the connecting shaft 333, so that the overall structure of the planetary reduction gear 3 may be simpler and the assembly may be more convenient.

It is understood that the first planetary gear 331 and the second planetary gear 332 can also be assembled with the connecting shaft 333 in a flat key connection manner. Alternatively, one flat key may be provided on the connecting shaft 333, or two flat keys may be provided on the connecting shaft 333. When a flat key is arranged on the connecting shaft 333, the flat key may be engaged with the first planet wheel 331, the flat key may be engaged with the second planet wheel 332, and the flat key may be engaged with both the first planet wheel 331 and the second planet wheel 332. When two flat keys are provided on the connecting shaft 333, one of the flat keys is engaged with the first planet gear 331, and the other flat key is engaged with the second planet gear 332.

It should be noted that the design of the first planetary gear 331 and the second planetary gear 332 is not limited to this. For example, the first planetary gear 331 and the second planetary gear 332 may be provided as a component, the first planetary gear 331 and the second planetary gear 332 may be connected with the connecting shaft 333 in a flat key connection or a spline connection, respectively, and the connecting shaft 333 may be pivoted relative to the planet carrier 34.

In some embodiments of the present invention, one of the first planetary gear 331 and the second planetary gear 332 in the planetary gear set 33 may be integrally formed with the connecting shaft 333, and the other of the first planetary gear 331 and the second planetary gear 332 may be splined to the connecting shaft 333. That is, the first planetary gear 331 may be provided integrally with the connecting shaft 333, and the second planetary gear 332 may be linked with the connecting shaft 333, or the second planetary gear 332 may be provided integrally with the connecting shaft 333, and the first planetary gear 331 may be linked with the connecting shaft 333. Therefore, through the arrangement, the structure of the planetary gear set 33 can be simpler, and the assembly efficiency can be improved.

For example, the second planetary gears 332 and the connecting shaft 333 are formed as an integrally formed gear shaft, and the first planetary gears 331 and the connecting shaft 333 are splined together. When the planetary reduction gear 3 is operated, the sun gear 32 may drive the first planet gears 331 to rotate, the first planet gears 331 may drive the gear shafts to rotate, and the gear shafts rotate and are simultaneously matched with the ring gear 31, so that the first planet gears 331, the second planet gears 332, and the connecting shaft 333 may revolve around the sun gear 32.

As shown in fig. 10-11, according to some embodiments of the present invention, a first bearing 35 may be disposed between the sun gear 32 and the differential case 41, and the first bearing 35 may support the sun gear 32, so that the transmission between the motor shaft 21 and the sun gear 32 may be smoother, and the operation noise generated by the sun gear 32 under high-speed rotation may be reduced.

In some embodiments of the present invention, the second bearings 8 are disposed between the differential housing 41 and the second portion 12 of the axle housing assembly 1, and between the differential housing 41 and the motor casing 22, and the second bearings 8 can make the connection between the differential housing 41 and the axle housing assembly 1 and the motor casing 22 smoother, and can make the operation of the drive axle 100 smoother.

As shown in fig. 4 to 5, according to some embodiments of the present invention, the outer peripheral wall of the ring gear 31 may be provided with a first fitting groove 31a, the inner peripheral wall of the axle housing assembly 1 may be provided with a second fitting groove (not shown), the first fitting groove 31a may be fitted with the second fitting groove to form a fitting hole, and the drive axle 100 may further include a fixing member 9, and the fixing member 9 may be in interference fit with the fitting hole, so that the fitting structure of the ring gear 31 and the axle housing assembly 1 may be more compact.

Specifically, when the ring gear 31 is assembled with the axle housing assembly 1, a portion of the fixing member 9 may be placed in the first fitting groove 31a, and the fixing member 9 is interference-fitted with the first fitting groove 31a to position the fixing member 9 in the first fitting groove 31 a. The axle housing assembly 1 may then be sleeved over the ring gear 31 and a portion of the fastener 9 may extend into the second mating groove, whereby the ring gear 31 and the axle housing assembly 1 may be connected together by the fastener 9 and the fastener 9 may limit axial and circumferential displacement of the ring gear 31. Through the setting, first cooperation groove 31a and second cooperation groove all can be the blind hole, can make ring gear 31 inseparabler with axle housing assembly 1's cooperation structure, can reduce the risk point of axle housing assembly 1 oil leak and oil impregnate.

As shown in fig. 10, in some embodiments of the present invention, the cross section of the first fitting groove 31a and the cross section of the second fitting groove may be formed in a semicircular shape, and the fixing member 9 may be a cylindrical pin, whereby the fitting of the fixing member 9 with the first fitting groove 31a and the second fitting groove may be smoother. For example, the first fitting groove 31a and the second fitting groove may each be formed as a semi-cylindrical groove, and the fixing member 9 may be formed as a cylindrical pin. Therefore, the cambered surface contact can be formed between the fixing piece 9 and the first matching groove 31a and the second matching groove, and the assembling difficulty between the fixing piece 9 and the first matching groove 31a and the second matching groove can be reduced.

Alternatively, the fixing member 9 may be an elastic material member, and when the fixing member 9 is assembled with the first and second fitting grooves 31a and 31 b, the fixing member 9 may be elastically deformed, thereby not only facilitating the assembly, but also making the connection between the fixing member 9 and the first and second fitting grooves 31a and 31 b more secure.

It should be noted that the design forms of the first engagement groove 31a, the second engagement groove, and the fixing member 9 are not limited to this. For example, the first engagement groove 31a and the second engagement groove may be formed in a hemispherical shape, and the fixing member 9 may be a metal ball.

In some embodiments of the present invention, the first fitting grooves 31a may be multiple, multiple first fitting grooves 31a may be distributed at intervals in the circumferential direction of the inner gear ring 31, and multiple second fitting grooves corresponding to the first fitting grooves 31a one-to-one may be provided on the inner circumferential wall of the axle housing assembly 1, so that a multi-point connection may be formed between the inner gear ring 31 and the axle housing assembly 1, and the fitting structure of the inner gear ring 31 and the axle housing assembly 1 may be firmer. Alternatively, the first fitting grooves 31a may extend to both ends of the ring gear 31 in the axial direction, whereby the contact area between the ring gear 31 and the axle housing assembly 1 may be increased, and the structural rigidity of the ring gear 31 may be improved.

In some embodiments of the present invention, as shown in fig. 1 and 15, the mounting seats 13 are provided on both the first section 11 and the second section 12 of the axle housing assembly 1, and the two mounting seats 13 extend in the same direction. A shock absorber 103 is further arranged between the drive axle 100 and the frame 200, one end of the shock absorber 103 is connected with the frame 200, and the other end of the shock absorber 103 is connected with the mounting base 13. The damper 103 may play a role of buffering and damping, and may make the operation of the vehicle more stable.

In the specific example shown in fig. 6, the transaxle 100 may further include a brake assembly 102, the brake assembly 102 may be fixed to a mounting flange of the transaxle case assembly 1 by bolting, a axle sleeve 51 may be provided between the hub assembly 101 and the wheel-end half shaft 5, and the hub assembly 101 may rotate around the axle sleeve 51. The mounting flange of the axle housing assembly 1 is further provided with an ABS sensor assembly 102a, and the ABS sensor assembly 102a is in communication with the sensor head 102 b. When the vehicle runs, the wheel end half shaft 5 can transmit power to the hub assembly 101, the sensor magnetic head 102b and a gear ring of the hub assembly 101 form an induced voltage signal when rotating, the voltage signal can be output to an ECU control system, and the ECU control system can control the brake assembly 102 to be locked when braking, so that the braking effect can be realized.

The vehicle according to the embodiment of the present invention includes the transaxle 100 according to the above-described embodiment of the present invention. Alternatively, the vehicle may be an electric commercial vehicle.

According to the vehicle provided by the embodiment of the invention, the drive axle 100 is arranged, the planetary reduction gear 3 and the differential 4 are arranged in the drive axle 100, the planet carrier 34 in the planetary reduction gear 3 and the differential shell 41 of the differential 4 are arranged to be an integrally formed part, so that the matching structure of the planetary reduction gear 3 and the differential 4 is more compact, the integral structure of the drive axle 100 is more compact, the light weight and function concentration integrated design of the drive axle 100 can be realized, the integral structure of the vehicle is more compact, and the production cost is saved.

A transaxle 100 according to an embodiment of the present invention, which transaxle 100 may be used in an electric commercial vehicle, will be described in detail with reference to fig. 1 to 14. It is to be understood that the following description is only exemplary, and not restrictive of the invention.

As shown in fig. 4, the axle housing assembly 1 includes a first section 11 and a second section 12, and the first section 11 and the second section 12 are arranged at a spacing in the left-right direction. As shown in fig. 1-2, the first portion 11 and the second portion 12 are each provided with a mounting seat 13, and both mounting seats 13 extend in the radial direction of the axle housing assembly 1, and the extending directions of the two mounting seats 13 are the same. A shock absorber 103 is arranged between the drive axle 100 and the frame 200, one end of the shock absorber 103 is connected with the frame 200, and the other end of the shock absorber 103 is connected with the mounting seat 13. The damper 103 may play a role of buffering and damping, and may make the operation of the vehicle more stable.

The motor 2 is arranged between the first part 11 and the second part 12, the motor 2 comprising a motor housing 22 and a hollow motor shaft 21. As shown in fig. 9, the motor casing 22 is provided with an inlet port 23 and an outlet port 24, and the motor casing 22 is provided with a cooling flow path therein. The coolant can enter the motor case 22 through the inlet port 23, and the coolant flows through the cooling flow path, thereby cooling the motor 2.

Be equipped with a plurality of connecting pieces 6 at drive axle 100 circumferencial direction interval distribution on drive axle 100, connecting piece 6 is stud, and connecting piece 6 passes first portion 11, motor casing 22 and second part 12 in proper order and links together axle housing assembly 1 and motor 2, both ends respectively with fixation nut 61 threaded connection about connecting piece 6, and fixation nut 61 firmly ends to support on axle housing assembly 1's periphery wall.

As shown in fig. 10 to 11, the planetary reduction device 3 includes a ring gear 31, a sun gear 32, a planetary gear set 33, and a carrier 34. As shown in fig. 5, the outer peripheral wall of the ring gear 31 is provided with a plurality of first fitting grooves 31a spaced apart in the circumferential direction thereof, the inner peripheral wall of the axle housing assembly 1 may be provided with a plurality of second fitting grooves corresponding to the first fitting grooves 31a one-to-one, and the first fitting grooves 31a and the second fitting grooves are formed in a semi-cylindrical shape. The first fitting grooves 31a and the corresponding second fitting grooves are fitted to form cylindrical fitting holes, and the fixing member 9 is a cylindrical pin and is in interference fit with the fitting holes, so that the ring gear 31 and the axle housing assembly 1 can be tightly connected together.

As shown in fig. 11-12, the motor shaft 21 is provided with a first spline, the sun gear 32 is provided with a second spline, and the spline housing 7 is respectively matched with the first spline and the second spline to connect the motor shaft 21 and the sun gear 32. The motor shaft 21 can transmit power to the sun gear 32 through the spline housing 7. The planetary gear set 33 includes a first planetary gear 331, a second planetary gear 332, and a connecting shaft 333, the first planetary gear 331 and the second planetary gear 332 are integrally formed, and the first planetary gear 331 and the second planetary gear 332 are respectively coupled with the connecting shaft 333 in a spline connection manner. The first planet gears 331 are meshed with the sun gear 32, the second planet gears 332 are meshed with the ring gear 31, and the planet carrier 34 is connected with the connecting shaft 333 to be driven by the connecting shaft 333 to rotate.

As shown in FIG. 8, the number of teeth of sun gear 32 may be Z₁The number of teeth of the first planetary gear 331 may be Z₂The number of teeth of the second planet gear 332 can be Z₃And the number of teeth of the ring gear 31 may be Z₄Transmission ratio of the planetary reduction gear 3

The value range of the transmission speed ratio i of the planetary reduction gear 3 is as follows: i is more than or equal to 7 and less than or equal to 21.

As shown in fig. 4 to 5, both the wheel-end half shafts 5 extend in the left-right direction, wherein the left wheel-end half shaft 5 is connected to the left wheel hub assembly 101 through the hollow motor shaft 21 by a fixing bolt 101a, and the right wheel-end half shaft 5 is connected to the right wheel hub assembly 101 by a fixing bolt 101 a. The hub assemblies 101 on the left side and the right side of the vehicle body are axially locked by the stop washer 101c and the positioning nut 101 b.

As shown in fig. 13 to 14, the differential 4 includes: a differential case 41, a propeller shaft 43, two differential gears 44, and two side gears 42. The differential case 41 and the carrier 34 in the planetary reduction gear 3 are formed as an integral part, and the propeller shaft 43 is connected to the differential case 41 so as to be driven by the differential case 41 to rotate. Two differential gears 44 are inserted through the transmission shaft 43, and the two differential gears 44 are horizontally disposed and vertically spaced apart from each other. Two side gears 42 are vertically disposed, and each side gear 42 is engaged with two differential gears 44, respectively. When the vehicle is traveling in a straight line, the propeller shaft 43 may drive the two differential gears 44 to revolve, and the two side gears 42 cooperate with the two differential gears 44 to transmit power to the corresponding hub assemblies 101 through the wheel-end half shafts 5. When the vehicle turns, the hub assemblies 101 on both sides of the vehicle body generate two additional forces in opposite directions due to different resistances, and the additional forces can be transmitted to the corresponding side gears 42 through the wheel-end half shafts 5, so that the two differential gears 44 can be forced to rotate around the transmission shaft 43, the rotation speed of the side gear 42 corresponding to the hub assembly 101 on the inner side of the vehicle body is reduced, the rotation speed of the side gear 42 corresponding to the hub assembly 101 on the outer side of the vehicle body is increased, and the rotation speeds of the hub assemblies 101 on both sides of the vehicle body can be different.

As shown in fig. 6, the brake assembly 102 is fixed to a mounting flange of the axle housing assembly 1 by means of bolts, a axle sleeve 51 is provided between the hub assembly 101 and the wheel-end half axle 5, and the hub assembly 101 can rotate around the axle sleeve 51. The mounting flange of the axle housing assembly 1 is further provided with an ABS sensor assembly 102a, and the ABS sensor assembly 102a is in communication with the sensor head 102 b. When the vehicle runs, the wheel end half shaft 5 can transmit power to the hub assembly 101, the sensor magnetic head 102b and a gear ring of the hub assembly 101 form an induced voltage signal when rotating, the voltage signal can be output to an ECU control system, and the ECU control system can control the brake assembly 102 to be locked when braking, so that the braking effect can be realized.

It is to be understood that in the description of the present invention, the terms "length", "left", "right", "vertical", "horizontal", "axial", "radial", "circumferential", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A drive axle, comprising:

an axle housing assembly;

the motor comprises a motor shaft which is a hollow shaft;

the planetary reduction gear is arranged on the axle housing assembly and comprises an inner gear ring, a sun gear, a planetary gear set and a planet carrier, and the inner gear ring is fixed on the axle housing assembly; the sun wheel is connected with the motor shaft to be driven by the motor to rotate, the planetary wheel set comprises a first planetary wheel, a second planetary wheel and a connecting shaft, the connecting shaft is respectively connected with the first planetary wheel and the second planetary wheel to enable the first planetary wheel and the second planetary wheel to be coaxially driven, the first planetary wheel is meshed with the sun wheel, the second planetary wheel is meshed with the inner gear ring, and the planetary carrier is connected with the connecting shaft to be driven by the connecting shaft to rotate;

differential mechanism, differential mechanism establishes in the axle housing assembly, differential mechanism includes differential mechanism casing and two side gear, differential mechanism casing and two the side gear cooperation is in order to drive two side gear rotates, differential mechanism casing with the planet carrier is integrated into one piece, two side gear links to each other with two wheel end semi-axles respectively, one of them the wheel end semi-axle passes the motor shaft.

2. The drive axle of claim 1 wherein the axle housing assembly includes first and second portions disposed on respective axial sides of the motor casing;

the drive axle further comprises a connecting piece, the connecting piece penetrates through the motor shell, and two ends of the connecting piece are respectively connected with the first portion and the second portion.

3. The transaxle of claim 2 wherein the connecting member has external threads at both ends in the axial direction and is inserted through the first portion and the second portion to engage with corresponding retaining nuts.

4. The transaxle of claim 2 wherein one axial end of the connecting member is provided with a stopper that abuts against an outer peripheral wall of one of the first portion and the second portion, and the other axial end of the connecting member is provided with an external thread and passes through the other of the first portion and the second portion to engage with a fixing nut.

5. The drive axle of claim 1, wherein the differential further comprises: differential gear and at least one first gasket that transmission shaft, two intervals set up, the transmission shaft with the differential casing links to each other, two differential gear wears to establish in order by on the transmission shaft drive rotates, two side gear is located the both sides of transmission shaft, every side gear is simultaneously with two differential gear meshes with by two differential gear drive rotates, first gasket is worn to establish on the transmission shaft and is located differential gear is close to the one end of differential casing, first gasket orientation differential gear is equipped with first oil guide hole on the surface.

6. The drive axle of claim 5, wherein the differential further comprises at least one second shim, the second shim is disposed through the wheel-end axle shaft and located at an end of the side gear away from the drive shaft, and a second oil guide hole is disposed on an end surface of the second shim facing the side gear.

7. The drive axle according to claim 5, wherein the drive shaft is provided with at least one oil guide groove extending in an axial direction of the drive shaft.

8. The drive axle of claim 1, wherein an oil inlet passage is provided on the connecting shaft, the oil inlet passage being used for introducing the lubricating oil in the cavity of the axle housing assembly into the planetary reduction gear.

9. The transaxle of claim 8 wherein the planetary reduction gear further comprises an oil guide plate disposed on the carrier, at least a portion of the oil guide plate facing the oil inlet passage for guiding the lubricant oil into the oil inlet passage.

10. The transaxle of claim 1, further comprising: the motor shaft is provided with a first spline, the sun gear is provided with a second spline, and the spline housing is matched with the first spline and the second spline to be connected with the motor shaft and the sun gear respectively.

11. The drive axle according to claim 1, wherein the connecting shaft is fixedly connected to the planet carrier, and the first planet wheel and the second planet wheel are each in keyed connection with the connecting shaft.

12. The transaxle of claim 11 wherein the first planet gear and the second planet gear are integrally formed, and the first planet gear and the second planet gear are each splined to the connecting shaft.

13. The transaxle of claim 11 wherein the connecting shaft is integrally formed with the carrier.

14. The drive axle of claim 1 wherein a first bearing is disposed between the sun gear and the differential housing.

15. The drive axle according to any one of claims 1 to 14, wherein a first fitting groove is formed in an outer peripheral wall of the ring gear, a second fitting groove is formed in an inner peripheral wall of the axle housing assembly, the first fitting groove and the second fitting groove cooperate to form a fitting hole, and the drive axle further comprises a fixing member that is in interference fit with the fitting hole.

16. The transaxle of claim 15 wherein the first and second mating grooves are each formed in a semicircular shape in cross section, and the fixing member is a cylindrical pin.

17. The drive axle according to claim 15, wherein the first fitting grooves are plural, the plural first fitting grooves are distributed at intervals in the circumferential direction of the ring gear, and the inner peripheral wall of the axle housing assembly is provided with plural second fitting grooves corresponding to the first fitting grooves one to one.

18. A vehicle, characterized by comprising a drive axle according to any one of claims 1-17.