CN110962505B

CN110962505B - Drive axle and vehicle with same

Info

Publication number: CN110962505B
Application number: CN201811161585.XA
Authority: CN
Inventors: 何育宁; 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: 2022-11-11
Anticipated expiration: 2038-09-30
Also published as: CN110962505A

Abstract

The invention discloses a drive axle and a vehicle with the same, wherein the drive axle comprises: a motor assembly including a motor shaft; the axle housing assembly comprises an axle housing cavity; decelerator, decelerator establishes in the axle housing cavity, the motor shaft with decelerator links to each other, decelerator's inside is equipped with planet wheel and first connecting shaft, first connecting shaft passes the planet wheel and with the planet wheel passes through roller bearing and connects, be equipped with the oil feed passageway in the first connecting shaft in order to incite somebody to action the axle housing cavity with decelerator's inside intercommunication. The drive axle can lubricate all parts in the speed reducer, improve the reliability of the drive axle and prolong the service life of the drive axle.

Description

Drive axle and vehicle with same

Technical Field

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

Background

In the drive axle of the related art, the lubrication effect between each part inside the reduction gear is poor, and then the reliability and the service life of the drive axle are influenced to a certain extent.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a drive axle which can lubricate each component in the reduction gear, improve the reliability of the drive axle, and prolong the service life of the drive axle.

The invention further provides a vehicle which comprises the drive axle.

The drive axle according to the embodiment of the invention comprises: a motor assembly including a motor shaft; the axle housing assembly comprises an axle housing cavity; decelerator, decelerator establishes in the axle housing cavity, the motor shaft with decelerator links to each other, decelerator's inside is equipped with planet wheel and first connecting shaft, first connecting shaft passes the planet wheel and with the planet wheel passes through roller bearing and connects, be equipped with the oil feed passageway in the first connecting shaft in order to incite somebody to action the axle housing cavity with decelerator's inside intercommunication.

According to the drive axle provided by the embodiment of the invention, the axle housing cavity is communicated with the interior of the speed reducing device by arranging the oil inlet channel in the first connecting shaft in the speed reducing device. Therefore, each part in the speed reducing device can be lubricated, the dry grinding phenomenon between each part in the speed reducing device is avoided to a certain extent, the reliability of the speed reducing device can be improved, the reliability of a drive axle is improved, and the service life of the drive axle is prolonged.

According to some embodiments of the invention, the oil inlet of the oil inlet passage is located on an axial end face of the first connecting shaft, and the outer peripheral wall of the first connecting shaft is provided with an oil outlet hole communicated with the oil inlet passage.

Further, a gap is arranged between the first connecting shaft and the inner wall of the planet wheel, and the oil outlet is communicated with the gap.

According to some embodiments of the invention, the reduction gear comprises a planetary reduction gear comprising a sun wheel, a planetary wheel and a planet carrier, the sun wheel being connected to the motor shaft and the planetary wheel being in mesh with the sun wheel.

In some embodiments of the present invention, the planetary reducer 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 is disposed opposite to the oil inlet so as to guide lubricating oil into the oil inlet channel.

In some embodiments of the present invention, the planetary reducer further includes a planetary spacer, the planetary spacer is sleeved on the first connecting shaft and located between the planetary carrier and the planetary gear, a first oil guiding groove is disposed on an end surface of the planetary spacer, the end surface being close to the planetary gear, and the planetary spacer is further provided with an oil guiding hole penetrating through the planetary spacer in a thickness direction thereof.

Specifically, the inner peripheral wall of the planet gasket is provided with a concave hole which is concave outwards so as to limit the oil guide hole.

According to some embodiments of the invention, the drive axle further comprises a differential, the differential comprising: the shell is internally provided with a placing space, and the shell is connected with the output end of the speed reducing device; the second connecting shaft is arranged in the placing space and fixed on the shell to synchronously rotate along with the shell; the bevel gear is sleeved on the second connecting shaft and can rotate relative to the second connecting shaft; and the side gear is arranged in the placing space and is in meshing fit with the bevel gear.

In some embodiments of the present invention, a first gasket is disposed between the bevel gear and the housing, and a first oil through groove is disposed on a surface of the first gasket facing the bevel gear.

In some embodiments of the present invention, a second spacer is disposed between the side gear and the inner wall of the housing.

Furthermore, a second oil through groove is formed in the end face, facing the side gear, of the second gasket.

In some embodiments of the present invention, a second oil guide groove is formed on an outer circumferential wall of a portion of the second connecting shaft, which is engaged with the bevel gear.

According to some embodiments of the invention, the electric motor assembly further comprises a motor housing defining a flow passage and an electric motor assembly disposed within the motor housing, the axle housing assembly comprising: the first axle housing assembly is arranged at one end of the motor housing, a first overflow port is arranged on the first axle housing assembly and communicated with the flow channel, the first axle housing assembly comprises a first axle housing cavity, and the first overflow port is communicated with the first axle housing cavity; second axle housing assembly, second axle housing assembly establishes the other end of motor casing, be equipped with the second overflow mouth on the second axle housing assembly, the second overflow mouth with flow channel intercommunication, second axle housing assembly includes second axle housing cavity, second overflow mouth intercommunication second axle housing cavity.

According to some embodiments of the present invention, the drive axle further includes a spoiler disposed on the motor shaft, the spoiler being located within the axle housing assembly.

According to some embodiments of the invention, the motor assembly further comprises an oil seal assembly sealing a gap between the motor shaft and a motor housing of the motor assembly.

According to some embodiments of the invention, the speed reduction device is a multi-stage speed reducer.

According to the embodiment of the invention, the vehicle comprises the drive axle according to the embodiment of the invention.

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, with a vehicle according to an embodiment of the invention, and with a transaxle according to an embodiment of the invention described above.

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 illustration of a drive axle according to an embodiment of the present invention;

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

FIG. 3 is a partial cross-sectional view A of a drive axle according to an embodiment of the present invention;

FIG. 4 is a partial cross-sectional view B of a transaxle according to an embodiment of the present invention;

FIG. 5 is a partial schematic view C of a transaxle according to an embodiment of the present invention;

FIG. 6 is a schematic view of a planetary shim according to an embodiment of the present invention;

FIG. 7 is an exploded view of a differential according to an embodiment of the present invention;

FIG. 8 is a partial schematic view D of a differential according to an embodiment of the present invention;

FIG. 9 is a schematic view of a second connecting shaft according to an embodiment of the invention;

FIG. 10 is a schematic view of a first shim according to an embodiment of the present invention;

FIG. 11 is a schematic view of a second shim according to an embodiment of the present invention.

Reference numerals:

a transaxle 100;

a motor assembly 1; a motor case 11; a flow channel a; a motor shaft 121; an oil seal assembly 13;

an axle housing assembly 10; an axle housing cavity 10a;

a first axle housing assembly 2; a first overflow port 21; a first axle housing cavity 22;

a second axle housing assembly 3; a second overflow port 31; an oil fill port 32; an oil drain port 33; a second axle housing cavity 34;

a reduction gear 4; the planetary speed reducer 41; a sun gear 411; a planetary gear 412; a carrier 413;

a first connecting shaft 414; an oil inlet channel b; an oil inlet c; an oil outlet d; an oil guide plate 415; a planetary washer 416;

a first oil guide groove 416a; oil guide holes 416b; a ring gear 417;

a differential 5; a housing 51; the placement space 51a; a positioning groove 51b; a connection hole 51c; a second connecting shaft 52;

the second oil guide groove 52a; positioning holes 52b; bevel gears 53;

side gears 54; a first gasket 55; a first oil through groove 55a; a second spacer 56; a second oil passage groove 56a;

a half shaft 6; a first brake assembly 7; a second brake assembly 8; a hub unit 9; a half shaft oil seal 40;

a bearing 20; and a roller bearing 30.

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.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the 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 of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A transaxle 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 11.

As shown in fig. 1 to 11, a transaxle 100 according to an embodiment of the present invention includes: motor assembly 1, axle housing assembly 10 and decelerator 4.

Specifically, the motor assembly 1 includes a motor shaft 121. The axle housing assembly 10 includes an axle housing cavity 10a.

The speed reducer 4 is arranged in the axle housing cavity 10a, and the motor shaft 121 is connected with the speed reducer 4. It can be seen that the speed reducer 4 can be driven by the motor shaft 121, that is, the motor assembly 1 can provide the power for the speed reducer 4 to operate.

The reduction gear unit 4 is provided internally with a planetary gear 412 and a first connecting shaft 414, the first connecting shaft 414 passing through the planetary gear 412 and being connected to the planetary gear 412 via a roller bearing 30. It can be seen that the first connecting shaft 414 can rotate synchronously with the planetary gears 412 (it is described herein that the synchronous rotation of the planetary gears 412 and the first connecting shaft 414 does not rotate around the central axis of the first connecting shaft 414, but rather the position of the integral structure of the first connecting shaft 414 changes continuously), and the planetary gears 412 can also rotate relative to the first connecting shaft 4.

An oil inlet passage b is provided in the first connecting shaft 414 to communicate the axle housing cavity 10a with the interior of the reduction gear 4. It is known that lubricating oil is provided in the axle housing cavity 10a, and the setting of oil inlet channel b makes lubricating oil in the axle housing cavity 10a enter into the interior of the reduction gear 4 through the oil inlet channel b, and then can lubricate first connecting shaft 414 and planet wheel 412 effectively, and when being equipped with a plurality of passing holes that run through it in its thickness direction on the perisporium of roller bearing 30, then lubricating oil accessible passing hole flows between planet wheel 412 and first connecting shaft 414, and then improves the effect that lubricating oil lubricates first connecting shaft 414 and planet wheel 412.

Meanwhile, along with the operation of the speed reducer 4 and the flowing of the lubricating oil, the lubricating oil can also lubricate other parts in the speed reducer 4, and the dry grinding phenomenon between the parts in the speed reducer 4 is avoided to a certain extent, so that the reliability of the speed reducer 4 can be improved, the reliability of the drive axle 100 is improved, and the service life of the drive axle 100 is prolonged.

According to the transaxle 100 of the embodiment of the present invention, the axle housing chamber 10a is communicated with the inside of the reduction gear 4 by providing the oil inlet passage b in the first connecting shaft 414 in the reduction gear 4. Therefore, all parts in the speed reducing device 4 can be lubricated, the dry grinding phenomenon among all parts in the speed reducing device 4 is avoided to a certain extent, the reliability of the speed reducing device 4 can be improved, the reliability of the drive axle 100 is improved, and meanwhile, the service life of the drive axle 100 is prolonged.

As shown in fig. 5, according to some embodiments of the present invention, the oil inlet c of the oil inlet passage b is located on an axial end face of the first connecting shaft 414, and the outer peripheral wall of the first connecting shaft 414 is provided with an oil outlet hole d communicating with the oil inlet passage b. Therefore, the lubricating oil can enter the oil inlet passage b in the first connecting shaft 414 through the oil inlet c and flow to the oil outlet d along with the rotation of the first connecting shaft 414, so as to lubricate the outer peripheral wall of the first connecting shaft 414 to a certain extent.

Further, a gap is formed between the first connecting shaft 414 and the inner wall of the planet wheel 412, and the oil outlet d is communicated with the gap. It can be seen that the lubricant oil flowing from the oil inlet passage b to the outside of the oil outlet d can flow into the gap between the first connecting shaft 414 and the inner wall of the planetary gear 412, and it can be understood that the gap can be communicated with the inside of the reduction gear 4, so that the lubricant oil can flow into the inside of the reduction gear 4 along the gap to lubricate each component in the reduction gear 4, thereby improving the lubricating effect in the reduction gear 4 and the reliability of the reduction gear 4, which is beneficial to improving the reliability of the drive axle 100 and prolonging the service life of the drive axle 100.

Specifically, the direction in which the lubricating oil flows in the reduction gear 4 may be: the lubricating oil flows into the oil inlet passage b of the first connecting shaft 414 through the oil inlet c, then flows to the oil outlet d, flows along the oil outlet d to the inner ring of the roller bearing 30, flows into the gap between the first connecting shaft 414 and the inner wall of the planetary gear 412 (since the roller bearing 30 is located in the gap, it can be considered that the lubricating oil flows through or past the roller bearing 30), and finally flows into the internal components of the reduction gear transmission 4, such as the sun gear 411, along the gap.

The direction in which the lubricating oil flows in the reduction gear 4 may also be: the lubricating oil flows into the oil inlet passage b of the first connecting shaft 414 through the oil inlet c, then flows to the oil outlet d, then flows to the inner ring of the roller bearing 30 along the oil outlet d, then flows to the gap between the first connecting shaft 414 and the inner wall of the planet gear 412 (since the roller bearing 30 is located in the gap, it can be considered that the lubricating oil can flow through or past the roller bearing 30), then flows to the outer ring of the roller bearing 30, and finally flows to the inner wall of the planet gear 412 along the gap.

According to some embodiments of the invention, the reduction device 4 comprises a planetary reducer 41, the planetary reducer 41 comprising a sun wheel 411, a planetary wheel 412 and a planet carrier 413, the sun wheel 411 being connected to the motor shaft 121, the planetary wheel 412 being in mesh with the sun wheel 411. It can be seen that when planetary reducer 41 is in operation, motor shaft 121 can drive sun gear 411 to rotate, and planet gears 412 mesh with sun gear 411 to be driven to rotate by sun gear 411. Alternatively, the motor shaft 121 may be connected to the sun gear 411 by a spline connection or a flat key connection. The sun gear 411 may be supported on a planet carrier 413 by a bearing 20, such as a deep groove ball bearing. Alternatively, the planet carrier 413 may be supported and mounted on the motor assembly 1 by a bearing 20 (e.g., a deep groove ball bearing). Alternatively, the interior of the reduction gear unit 4 can be defined by the ring gear 417 and the planet carrier 413, wherein the ring gear 417 can be in meshing engagement with the planet gears 413. Therefore, sufficient lubrication can be obtained between the sun gear 411 and the planet gear 413, between the planet gear 413 and the first connecting shaft 414, and between the planet gear 413 and the gear ring 417, and the reliability of the drive axle 100 is further improved.

As shown in fig. 4 to 5, in some embodiments of the present invention, the planetary reducer 41 further includes an oil guide plate 415, the oil guide plate 415 is disposed on the carrier 413, and at least a portion of the oil guide plate 415 is disposed opposite to the oil inlet c to guide the lubricating oil into the oil inlet passage b. That is, the oil guide plate 415 has a certain flow guiding function. It is known that, when the drive axle 100 works, the lubricating oil in the axle housing cavity 10a can be stirred by the rotating parts to perform centrifugal motion, and after the lubricating oil touches the oil guide plate 415, the lubricating oil will flow along the oil guide plate 415, and finally flow into the oil inlet channel b under the flow guiding effect of the oil guide plate 415, so as to ensure the amount of the lubricating oil in the oil inlet channel b of the first connecting shaft 414 to a certain extent, and further ensure the lubricating effect between the parts in the speed reducing device 4, further improve the reliability of the drive axle 100, and prolong the service life of the drive axle 100.

As shown in fig. 4 and fig. 6, in some embodiments of the present invention, the planetary reducer 41 further includes a planetary spacer 416, the planetary spacer 416 is sleeved on the first connecting shaft 414 and located between the planet carrier 413 and the planetary gear 412, a first oil guiding groove 416a is provided on an end surface of the planetary spacer 416 close to the planetary gear 412, and an oil guiding hole 416b penetrating through the planetary spacer 416 in a thickness direction thereof is further provided on the planetary spacer 416. Therefore, when the planet wheel 412 rotates relative to the planet pad 416, the planet wheel 412 and the planet pad 416 can be effectively lubricated, the abrasion of the end surface of the planet wheel 412 is reduced, and the reliability of the planetary speed reducer 41 is improved.

Specifically, as shown in fig. 6, concave holes that are recessed outward are provided on the inner peripheral wall of the planetary washer 416 to define oil guide holes 416b. That is, the oil guide hole 416b is disposed close to the first connecting shaft 414, so as to further lubricate the first connecting shaft 414, and at the same time, part of the lubricating oil can flow between the planetary spacers 416 and the housing 51 along the oil guide hole 416b, thereby playing a role of lubricating the housing 51 and the planetary spacers 416 to some extent, thereby improving reliability of the transaxle 100 and prolonging service life of the transaxle 100.

As shown in fig. 7-11, the transaxle 100 further includes a differential 5, the differential 5 including: a housing 51, a second connecting shaft 52, a bevel gear 53, and a side gear 54.

Specifically, a housing 51 defines a placing space 51a therein, and the housing 51 is connected to an output end of the reduction gear 4. So that the housing 51 can be driven in rotation with the output of the reduction gear unit 4. Wherein the housing 51 may be formed to be open.

A second connecting shaft 52 is provided in the placing space 51a, and the second connecting shaft 52 is fixed to the housing 51 to rotate in synchronization with the housing 51. That is, when the drive axle 100 operates, the differential 5 operates, and since the second connecting shaft 52 is fixed to the housing 51, the reliability of the synchronous rotation of the second connecting shaft 52 and the housing 51 is ensured, and thus the reliability of the differential 5 is ensured to some extent, and the reliability of the drive axle 100 can be ensured. It should be noted that the specific type of the second connecting shaft 52 can be selected according to actual situations, the second connecting shaft 52 can be formed as a straight shaft (as shown in fig. 7 and 9), and the second connecting shaft 52 can also be formed as a cross shaft, etc.

The bevel gear 53 is sleeved on the second connecting shaft 52 and can rotate relative to the second connecting shaft 52. Therefore, when the second connecting shaft 52 rotates, the bevel gear 53 can synchronously rotate along with the second connecting shaft 52, and the bevel gear 53 can also rotate relative to the second connecting shaft 52. That is, when the differential 5 operates, the bevel gear 53 may rotate (i.e., revolve) in synchronization with the housing 51 and the second connecting shaft 52, while the bevel gear 53 may also rotate (i.e., rotate) relative to the second connecting shaft 52.

The side gear 54 is provided in the placing space 51a and is in meshing engagement with the bevel gear 53. Reliable operation of the differential 5 and thus the reliability of the drive axle 100 can thereby be ensured.

Specifically, when the transaxle 100 is used in a vehicle, in the differential 5, the second connecting shaft 52 rotates synchronously with the rotation of the housing 51, and the bevel gear 53 is driven to revolve, and the bevel gear 53 is meshed with the side gear 54, so that the side gears 54 on both sides are driven to rotate, and the drive wheels on both sides of the vehicle rotate.

When the vehicle runs along a straight road surface, since the driving wheels on both sides of the vehicle receive equivalent resistance, the bevel gear 53 receives the same force at the meshing points with the side gears 54 on both the left and right sides, so that the bevel gear 53 performs only revolution.

When the vehicle runs or turns on an uneven road, because the driving wheels on the two sides of the vehicle are subjected to different resistances, under the feedback action of the resistances, the forces applied to the meshing points of the bevel gears 53 and the half shaft gears 54 on the left side and the right side are different, so that the bevel gears 53 not only revolve, but also rotate under the action of the difference of the applied forces, and further the rotating speeds of the half shaft gears 54 on the two sides of the bevel gears 53 are different, so that the rotating speeds of the driving wheels on the two sides of the vehicle are different, therefore, the vehicle can reliably run on the uneven road, or the vehicle can smoothly turn, and the running reliability of the vehicle is improved.

As shown in fig. 8 and 10, in some embodiments of the present invention, a first gasket 55 is disposed between the bevel gear 53 and the housing 51, and a first oil through groove 55a is disposed on a surface of the first gasket 55 facing the bevel gear 53. Therefore, the first spacer 55 is arranged to effectively prevent the bevel gear 53 from directly contacting the housing 51, and further to prevent the bevel gear 53 from being worn by the bevel gear 53 and the housing 51 due to contact friction generated between the bevel gear 53 and the housing 51 when the bevel gear 53 rotates relative to the second connecting shaft 52 (since the second connecting shaft 52 rotates synchronously with the housing 51 and the bevel gear 53 rotates, that is, when the bevel gear 53 rotates relative to the second connecting shaft 52, the bevel gear 53 rotates relative to the housing 51), so that the reliability of the structure of the differential 5 can be improved, and the service life of the drive axle 100 can be prolonged to a certain extent.

Meanwhile, when the bevel gear 53 rotates relative to the first gasket 55, due to the arrangement of the first oil through groove 55a, certain lubricating oil can be stored in the first oil through groove 55a, so that the first gasket 55 and the bevel gear 53 can be lubricated to a certain extent, and the dry grinding phenomenon between the first gasket 55 and the bevel gear 53 is reduced. Meanwhile, the bevel gear 53 and the second connecting shaft 52 can be lubricated to a certain degree, so that the phenomena of abrasion, ablation or burnout between the bevel gear 53 and the second connecting shaft 52 are reduced, the reliability of the differential 5 is improved, the reliability of the drive axle 100 is improved, and the service life of the drive axle 100 is prolonged.

As shown in fig. 10, according to some embodiments of the present invention, the first oil through groove 55a penetrates the first gasket 55 in a thickness direction of the first gasket 55. That is, the lubricating oil in the first oil passage groove 55a may flow toward the bevel gear 53 and may flow toward the housing 51, so that not only the first gasket 55 and the bevel gear 53 may be lubricated, but also the housing 51 and the first gasket 55 may be lubricated, and a dry-grinding phenomenon between the first gasket 55 and the housing 51 when the first gasket 55 rotates relative to the housing 51 when being stressed may be avoided to a certain extent, thereby further improving the reliability of the differential 5, further improving the reliability of the transaxle 100, and prolonging the service life of the transaxle 100.

According to some embodiments of the present invention, the first oil through groove 55a is plural, and the plural first oil through grooves 55a are distributed along a circumferential direction of the first gasket 55. For example, as shown in fig. 10, the number of the first oil through grooves 55a is four and each of the first oil through grooves 55a penetrates the first gasket 55 in the thickness direction of the first gasket 55. This can further improve the lubricating effect on the first spacer 55 and the bevel gear 53, thereby improving the reliability of the differential 5 and contributing to the extension of the service life of the transaxle 100.

Further, a first oil guide groove (not shown) is provided on a surface of the first spacer 55 facing the bevel gear 53, the first oil guide groove extending in a radial direction of the first spacer 55. Accordingly, the lubrication effect on the first spacer 55 and the bevel gear 53 can be further improved, and the reliability of the differential 5 can be further improved, thereby extending the service life of the transaxle 100. It is understood that the surface of the first gasket 55 facing the housing 51 may also be provided with a first oil guide groove, so as to improve the lubrication effect between the first gasket 55 and the housing 51.

As shown in fig. 7 and 8, in some embodiments of the present invention, a second spacer 56 is provided between the side gear 54 and the inner wall of the case 51. Therefore, wear of the side gear 54 and the case 51 due to direct contact can be effectively avoided, the reliability of the differential 5 can be further improved, and the service life of the transaxle 100 can be advantageously prolonged.

As shown in fig. 7 and 11, a second oil passage groove 56a is provided in an end surface of the second spacer 56 facing the side gear 54. Therefore, when the side gear 54 rotates relative to the second gasket 56, due to the arrangement of the second oil groove 56a, certain lubricating oil can be stored in the second oil groove 56a, so that the second gasket 56 and the side gear 54 can be lubricated to a certain extent, the dry grinding phenomenon between the second gasket 56 and the side gear 54 is reduced, the reliability of the differential 5 is further improved, and the service life of the drive axle 100 is prolonged.

Specifically, as shown in fig. 7 and 11, the second oil passage groove 56a penetrates the second gasket 56 in the thickness direction of the second gasket 56. That is, the lubricating oil in the second oil groove 56a may flow toward the side gear 54 and may also flow toward the case 51, so that not only the second gasket 56 and the side gear 54 may be lubricated, but also the case 51 and the second gasket 56 may be lubricated, and a dry-grinding phenomenon between the case 51 and the second gasket 56 when the second gasket 56 rotates relative to the case 51 when being stressed may be avoided to a certain extent, thereby further improving the reliability of the structure of the differential 5, and facilitating the extension of the service life of the transaxle 100.

Specifically, the second oil through groove 56a is plural, and the plural second oil through grooves 56a are distributed along the circumferential direction of the second gasket 56. For example, as shown in fig. 7 and 11, the second oil through grooves 56a are three and each of the second oil through grooves 56a penetrates the second gasket 56 in the thickness direction of the second gasket 56. This can further improve the lubricating effect on the second spacer 56 and the side gear 54, improve the reliability of the differential 5, and contribute to prolonging the service life of the transaxle 100.

Further, a second oil guide groove (not shown) is provided on a surface of the second spacer 56 facing the side gear 54, the second oil guide groove extending in a radial direction of the second spacer 56. The lubricating effect on the second spacer 56 and the side gear 54 can be further improved, and the reliability of the differential 5 can be further improved, and the service life of the transaxle 100 can be prolonged. It is understood that the second oil guide groove may be disposed on the surface of the second gasket 56 facing the housing 51, so as to improve the lubricating effect between the second gasket 56 and the housing 51.

Specifically, as shown in fig. 7, the housing 51 is provided with two positioning grooves 51b arranged oppositely, and two end portions of the second connecting shaft 52 respectively extend into the corresponding positioning grooves 51b to be fixed to the housing 51. Therefore, the second connecting shaft 52 is conveniently positioned, the second connecting shaft 52 is favorably and reliably fixed on the shell 51 to synchronously rotate along with the shell 51, the structural reliability of the differential 5 is further improved, and the service life of the drive axle 100 is favorably prolonged.

Further, as shown in fig. 7 to 9, a positioning hole 52b penetrating through the second connecting shaft 52 in the radial direction of the second connecting shaft 52 is provided on a portion of the second connecting shaft 52 protruding into the positioning groove 51b, a connecting hole 51c fitting the positioning hole 52b is provided on the case 51, and the differential 5 further includes a connecting member (not shown) having one end penetrating through the connecting hole 51c and the positioning hole 52b to fix the second connecting shaft 52 to the case 51. Therefore, the second connecting shaft 52 is fixed to the housing 51 in a simple and reliable manner. The mounting and dismounting of the second connecting shaft 52 is facilitated. While securing the second connecting shaft 52 to the housing 51.

As shown in fig. 7 and 9, in some embodiments of the present invention, a second oil guide groove 52a is provided on an outer circumferential wall of a portion of the second connecting shaft 52 that mates with the bevel gear 53. Therefore, when the bevel gear 53 rotates relative to the second connecting shaft 52, the lubricating oil in the second oil guiding groove 52a can effectively lubricate the bevel gear 53 and the second connecting shaft 52, so as to reduce the abrasion, ablation or burnout between the bevel gear 53 and the second connecting shaft 52, improve the reliability of the differential 5, and facilitate prolonging the service life of the drive axle 100.

It can be understood that, when the first gasket 55 is disposed between the bevel gear 53 and the housing 51, the first oil through groove 55a is disposed on the surface of the first gasket 55 facing the bevel gear 53, and the second oil through groove 52a is disposed on the outer peripheral wall of the portion of the second connecting shaft 52 that is engaged with the bevel gear 53, the second oil through groove 52a and the first oil through groove 55a on the first gasket 55 can be engaged with each other, that is, both the lubricating oil in the second oil through groove 52a and the lubricating oil in the first oil through groove 55a can flow to the portion of the second connecting shaft 52 that is engaged with the bevel gear 53, so that the amount of the lubricating oil between the second connecting shaft 52 and the bevel gear 53 can be increased, the second connecting shaft 52 and the bevel gear 53 can be lubricated more effectively, and the wear, ablation or burnout phenomenon between the second connecting shaft 52 and the bevel gear 53 can be reduced.

Further, as shown in fig. 7 and 9, the second oil guide groove 52a extends in the axial direction of the second connecting shaft 52. Accordingly, the second oil guide groove 52a has a simple structure and is easy to manufacture. While the lubricating effect on the bevel gear 53 and the second connecting shaft 52 can be ensured. The extending direction of the second oil guide groove 52a is not limited to this, and may extend in other directions or may be formed in different shapes. As long as it is ensured that the second oil guide groove 52a is provided to effectively lubricate the bevel gear 53 and the second connecting shaft 52.

Specifically, the second oil guide groove 52a is plural, and the plural second oil guide grooves 52a are distributed at intervals in the circumferential direction of the second connecting shaft 52. For example, there are two second oil guide grooves 52a, and the two second oil guide grooves 52a are symmetrical with respect to the central axis of the second connecting shaft 52. Therefore, the lubricating effect of the lubricating oil on the bevel gear 53 and the second connecting shaft 52 can be further improved, the friction phenomenon when the bevel gear 53 rotates relative to the second connecting shaft 52 is effectively reduced, the reliability of the differential 5 is improved, and the service life of the drive axle 100 is prolonged.

Optionally, an oil guide channel (not shown) is provided in the second connecting shaft 52, the oil guide channel extends along the axial direction of the second connecting shaft 52, an opening (not shown) communicating with the oil guide channel is provided on at least one axial end surface of the second connecting shaft 52, and the second oil guide groove 52a communicates with the oil guide channel. Therefore, part of the lubricating oil can flow into the oil guide channel through the opening and enter the second oil guide groove 52a through the oil guide channel to lubricate the bevel gear 53 and the second connecting shaft 52. Meanwhile, due to the arrangement of the oil guide flow passage, the effect of storing lubricating oil of the second connecting shaft 52 can be effectively improved, and sufficient lubrication between the bevel gear 53 and the second connecting shaft 52 is facilitated.

Alternatively, circular oil guide grooves (not shown) are further provided on the outer peripheral wall of the second connecting shaft 52, and are provided at both ends of a portion where the second connecting shaft 52 is engaged with the bevel gear 53. Therefore, when the differential 5 operates, the lubricating oil in the circular oil guide grooves can gradually flow to the part, where the second connecting shaft 52 is matched with the bevel gear 53, along the axial direction of the second connecting shaft 52 to lubricate the second connecting shaft 52 and the bevel gear 53, so that the friction phenomenon when the bevel gear 53 rotates relative to the second connecting shaft 52 can be further reduced, the reliability of the differential 5 is improved, and the service life of the differential 5 is prolonged. Meanwhile, it can be understood that the circular oil guide groove may be matched with the first oil guide groove 55a (or the second oil guide groove 52 a) of the first gasket 55, that is, the lubricating oil in the circular oil guide groove and the lubricating oil in the first oil guide groove 55a (or the second oil guide groove 52 a) may flow to the part where the second connecting shaft 52 is matched with the bevel gear 53, so as to increase the amount of the lubricating oil between the second connecting shaft 52 and the bevel gear 53, lubricate the second connecting shaft 52 and the bevel gear 53 more effectively, and reduce the wear, ablation or burnout phenomenon between the second connecting shaft 52 and the bevel gear 53.

As shown in fig. 1-3, according to some embodiments of the present invention, the motor assembly 1 further includes a motor housing 11 and a motor component 12 disposed in the motor housing 11, wherein the motor housing 11 defines a flow channel a. It should be noted that the flow channel a is only defined by the motor casing 11, and the flow channel a is not communicated with the space in the motor casing 11 where the motor component 12 is disposed, so that the lubricating oil can be effectively prevented from entering the motor casing 11 to affect the normal operation of the motor assembly 1, and the reliability of the drive axle 100 is further ensured.

The axle housing assembly 10 includes: first axle housing assembly 2 and second axle housing assembly 3.

Specifically, first axle housing assembly 2 is established in the one end of motor casing 11, is equipped with first overflow mouth 21 on the first axle housing assembly 2, and first overflow mouth 21 communicates with flow channel a. The first axle housing assembly 2 includes a first axle housing cavity 22, and the first overflow port 21 communicates with the first axle housing cavity 22. It can be seen that the first axle housing cavity 22 of the first axle housing assembly 2 can communicate with the flow passage a of the motor casing 11 through the first overflow port 21. When the liquid level of the lubricating oil in the first axle housing cavity 22 exceeds the first overflow port 21, the exceeding lubricating oil can flow into the flow channel a through the first overflow port 21, and when the lubricating oil in the first axle housing cavity 22 is less or lower than the first overflow port 21, the lubricating oil in the flow channel a can also flow into the first axle housing cavity 22 through the first overflow port 21. Therefore, the amount of lubricating oil in the first axle housing cavity 22 can be ensured to a certain extent, the lubricating effect among all the parts is ensured, and the reliability of the drive axle 100 is improved.

Second axle housing assembly 3 is established at the other end of motor casing 11, is equipped with second overflow mouth 31 on the second axle housing assembly 3, and second overflow mouth 31 and flow channel a intercommunication, second axle housing assembly 3 include second axle housing cavity 34, and second overflow mouth 31 intercommunication second axle housing cavity 34. It can be seen that the second axle housing cavity 34 of the second axle housing assembly 3 can communicate with the flow passage a of the motor casing 11 through the second overflow port 31. When the liquid level of the lubricating oil in the second axle housing cavity 34 exceeds the second overflow port 31, the exceeding lubricating oil can flow into the flow channel a through the second overflow port 31, and when the lubricating oil in the second axle housing cavity 34 is less or lower than the second overflow port 31, the lubricating oil in the flow channel a can also flow into the second axle housing cavity 34 through the second overflow port 31. Therefore, the amount of lubricating oil in the second axle housing cavity 34 can be ensured to a certain extent, the lubricating effect among all parts is ensured, and the reliability of the drive axle 100 is improved.

Meanwhile, the first axle housing cavity 22, the flow channel a and the second axle housing cavity 34 are sequentially communicated, so that when the liquid level of the lubricating oil in the first axle housing cavity 22 exceeds the first overflow port 21 and the lubricating oil in the second axle housing cavity 34 is less or lower than the second overflow port 31, the lubricating oil in the first axle housing cavity 22 can flow into the flow channel a through the first overflow port 21, and then the lubricating oil flows into the second overflow port 31 along the flow channel a and flows into the second axle housing cavity 34 through the second overflow port 31. Similarly, when the liquid level of the lubricating oil in the second axle housing cavity 34 exceeds the second overflow port 31 and the lubricating oil in the first axle housing cavity 22 is less or lower than the first overflow port 21, the lubricating oil can sequentially flow through the second overflow port 31, the flow channel a and the first overflow port 21 and finally flow into the first axle housing cavity 22. That is, the first axle housing cavity 22, the flow passage a and the second axle housing cavity 34 cooperate with each other through the first overflow port 21 and the second overflow port 31 to form an oil guiding passage for lubricating oil, so that when a vehicle (not shown) to which the drive axle 100 of the embodiment of the present invention is applied bumps during operation, the phenomenon that the lubricating oil in the first axle housing cavity 22 of the first axle housing assembly 2 or the second axle housing cavity 34 of the second axle housing assembly 3 is too little to cause abrasion, ablation and the like of internal components can be prevented to some extent.

It should be noted that, in the drive axle 100, when the components in the first axle housing assembly 2 and the second axle housing assembly 3 rotate at a relatively high speed and are dry-ground with each other, that is, when the lubricating oil is lacking between the components, the wear between the components is severe and high temperature is easily generated on the contact surfaces of the components, and then the phenomena of ablation or burnout of the components are easily generated.

In summary, in the drive axle 100 according to the embodiment of the present invention, the heights of the lubricating oils in the first axle housing assembly 2 and the second axle housing assembly 3 at the two ends of the motor assembly 1 can be balanced to a certain extent, so as to ensure the amounts of the lubricating oils in the first axle housing assembly 2 and the second axle housing assembly 3, improve the lubricating effect between the components in the first axle housing assembly 2 and the second axle housing assembly 3, effectively reduce the phenomena of dry abrasion, burning loss, etc. between the components, further improve the reliability of the drive axle 100, and facilitate prolonging the service life of the drive axle 100.

Specifically, the axle housing assembly 10 is provided with an oil fill port 32 and an oil drain port 33. When the axle housing assembly 10 includes the first axle housing assembly 2 and the second axle housing assembly 3 as described above, the oil filling port 32 and the oil discharge port 33 may be selectively provided in the first axle housing assembly 2 and/or the second axle housing assembly 3 depending on the actual construction of the transaxle 100. For example, as shown in fig. 1, the reduction gear 4 is provided on the second axle housing assembly 3, and the oil filler port 32 and the oil drain port 33 are also provided on the second axle housing assembly 3. Therefore, the amount of the lubricating oil in the drive axle 100 can be kept constant, so that the lubricating effect of all parts in the drive axle 100 can be ensured, and the reliability of the drive axle 100 can be improved.

Specifically, as shown in fig. 2 and 3, the transaxle 100 further includes a first brake assembly 7 and a second brake assembly 8, the first brake assembly 7 being disposed in the first axle housing assembly 2, and the second brake assembly 8 being disposed in the second axle housing assembly 3. So that the transaxle 100 can be ensured to have a braking function on the driving wheels of the vehicle, thereby controlling the stopping or rotation of the driving wheels.

Specifically, first brake assembly 7 passes through bolted connection on the brake mounting flange of first axle housing assembly 2, and second brake assembly 8 passes through bolted connection on the brake mounting flange of second axle housing assembly 3, has guaranteed the position stability of first brake assembly 7 in first axle housing assembly 2 from this, has guaranteed the position stability of second brake assembly 8 in second axle housing assembly 3.

Further, as shown in fig. 2 and 3, the drive axle 100 further includes two hub assemblies 9, and the two hub assemblies 9 are respectively mounted on the ends of the first axle housing assembly 2 and the second axle housing assembly 3 away from the motor assembly 1 through bearings 20. Thereby being beneficial to ensuring the reliability of the operation of the drive axle 100.

Specifically, as shown in fig. 2 and 3, the drive axle 100 further includes a half axle 6, and both ends of the half axle 6 are connected to the side gear 54 and the hub assembly 9, respectively, such that when the side gear 54 rotates, the half axle 6 is driven to rotate synchronously, and the half axle 6 drives the hub assembly 9 to rotate, thereby driving the driving wheels on both sides of the vehicle to rotate.

Specifically, the wheel hub assembly 9 is lubricated by grease, and the end face of the wheel hub assembly 9 far away from the motor assembly 1 is provided with a half-shaft oil seal 40. Therefore, the leakage of the lubricating oil in the first axle housing assembly 2 and the second axle housing assembly 3 can be effectively prevented, and the reliability of the drive axle 100 is improved.

According to some embodiments of the present invention, the transaxle 100 further includes a spoiler (not shown) provided on the motor shaft 121, the spoiler being located within the axle housing assembly 10. That is, the spoiler is located within the axle housing cavity 10a. Meanwhile, the spoiler can rotate in the axle housing cavity 10a along with the rotation of the motor shaft 121, so that the function of disturbing lubricating oil can be achieved to a certain extent, centrifugal motion of the lubricating oil in the axle housing cavity 10a is facilitated, more lubricating oil is in contact with each part in the axle housing cavity 10a, the lubricating effect of the lubricating oil on each part in the axle housing cavity 10a is further improved, the reliability of the drive axle 100 is improved, and the service life of the drive axle 100 is prolonged.

As shown in fig. 3, according to some embodiments of the present invention, the motor assembly 1 further includes an oil seal assembly 13, and the oil seal assembly 13 seals a gap between the motor shaft 121 and the motor housing 11. Therefore, lubricating oil can be effectively prevented from entering the motor assembly 1 through the gap between the motor shaft 121 and the motor shell 11 to affect the working reliability of the motor assembly 1, the reliability of the drive axle 100 can be improved, and the service life of the drive axle 100 can be prolonged.

As shown in fig. 2 and 4, according to some embodiments of the present invention, the reduction gear 4 is a multistage reduction gear. Therefore, the transmission ratio of the reduction gear 4 can be increased, and the reliability of the operation of the reduction gear 4, and thus the reliability of the operation of the transaxle 100, can be ensured.

Specifically, the axle housing assembly 10 is fixed to the motor assembly 1 by bolts. Therefore, the reliability of the axle housing assembly 10 arranged at the two ends of the motor assembly 1 can be ensured, and the mode of fixing the axle housing assembly 10 on the motor assembly 1 is simple and reliable.

The vehicle according to the embodiment of the present invention includes the transaxle 100 according to the above-described embodiment of the present invention.

According to the vehicle provided by the embodiment of the invention, by arranging the drive axle 100 provided by the embodiment of the invention, the heights of the lubricating oil in the first axle housing assembly 2 and the second axle housing assembly 3 at two ends of the motor assembly 1 can be balanced to a certain extent, so that the amount of the lubricating oil in the first axle housing assembly 2 and the second axle housing assembly 3 is ensured, the lubricating effect between each part in the first axle housing assembly 2 and the second axle housing assembly 3 is improved, the phenomena of dry abrasion, burning loss and the like between each part are effectively reduced, the reliability of the vehicle is improved, and the service life of the vehicle is prolonged.

Other configurations and operations of vehicles according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

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 present 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:

a motor assembly including a motor shaft;

an axle housing assembly including an axle housing cavity;

decelerator, decelerator establishes in the axle housing cavity, the motor shaft with decelerator links to each other, decelerator's inside is equipped with planet wheel and first connecting shaft, first connecting shaft passes the planet wheel and with the planet wheel passes through roller bearing and connects, be equipped with the oil feed passageway in the first connecting shaft in order to incite somebody to action the axle housing cavity with decelerator's inside intercommunication.

2. The drive axle of claim 1, wherein the oil inlet of the oil inlet passage is located on an axial end face of the first connecting shaft, and the outer peripheral wall of the first connecting shaft is provided with an oil outlet communicated with the oil inlet passage.

3. The transaxle of claim 2 wherein a gap is provided between the first connecting shaft and an inner wall of the planet gear, and the oil outlet is in communication with the gap.

4. The transaxle of claim 1 wherein the reduction device comprises a planetary gear set including a sun gear coupled to the motor shaft, planet gears, and a planet carrier, the planet gears being in mesh with the sun gear.

5. The drive axle of claim 4, wherein the planetary reducer further comprises 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 an oil inlet of the oil inlet passage so as to guide lubricating oil into the oil inlet passage.

6. The drive axle according to claim 4, wherein the planetary reducer further includes a planetary spacer, the planetary spacer is sleeved on the first connecting shaft and located between the planetary carrier and the planetary gear, a first oil guiding groove is provided on an end surface of the planetary spacer close to the planetary gear, and an oil guiding hole penetrating through the planetary spacer in a thickness direction is further provided on the planetary spacer.

7. The drive axle according to claim 6, wherein concave holes are provided on the inner peripheral wall of the planetary washer to be recessed outward to define the oil guide holes.

8. The drive axle of claim 1, further comprising a differential, the differential comprising:

the shell is internally provided with a placing space, and the shell is connected with the output end of the speed reducing device;

the second connecting shaft is arranged in the placing space and fixed on the shell so as to synchronously rotate along with the shell;

the bevel gear is sleeved on the second connecting shaft and can rotate relative to the second connecting shaft;

and the side gear is arranged in the placing space and is in meshing fit with the bevel gear.

9. The drive axle according to claim 8, wherein a first gasket is arranged between the bevel gear and the housing, and a first oil through groove is arranged on a surface of the first gasket facing the bevel gear.

10. The drive axle of claim 8 wherein a second spacer is provided between the side gear and the inner wall of the housing.

11. The transaxle of claim 10 wherein the second spacer has a second oil passage on an end surface thereof facing the side gear.

12. The drive axle according to claim 8, wherein a second oil guide groove is provided on an outer circumferential wall of a portion of the second connecting shaft engaged with the bevel gear.

13. The drive axle of claim 1 wherein the motor assembly further comprises a motor housing and a motor assembly disposed within the motor housing, the motor housing defining a flow passage therein, the axle housing assembly comprising:

the first axle housing assembly is arranged at one end of the motor housing, a first overflow port is arranged on the first axle housing assembly and communicated with the flow channel, the first axle housing assembly comprises a first axle housing cavity, and the first overflow port is communicated with the first axle housing cavity;

second axle housing assembly, second axle housing assembly establishes the other end of motor casing, be equipped with the second overflow mouth on the second axle housing assembly, the second overflow mouth with flow channel intercommunication, second axle housing assembly includes second axle housing cavity, second overflow mouth intercommunication second axle housing cavity.

14. The drive axle of claim 1 further comprising a spoiler disposed on the motor shaft, the spoiler being positioned within the axle housing assembly.

15. The drive axle of claim 1, wherein the motor assembly further comprises an oil seal assembly that seals a clearance between the motor shaft and a motor housing of the motor assembly.

16. The transaxle of claim 1 wherein the speed reduction device is a multi-speed reducer.

17. A vehicle, characterized in that it comprises a drive axle according to any one of claims 1-16.