CN204726222U - A kind of wheel motor drive system and a kind of wheel motor drive axle - Google Patents

Abstract

The utility model relates to a wheel side motor drive system and a wheel side motor drive bridge. The wheel motor drive system includes a drive motor assembly (2) and a final reducer assembly (4), and the final reducer assembly includes a driving gear, at least two intermediate gear shaft assemblies and an output gear (16), each intermediate The gear shaft assembly has a driving intermediate gear and a driven intermediate gear that are connected together in a co-rotating manner, the motor output shaft of the drive motor assembly is connected to the driving gear (13), and the driving gear is connected to each intermediate gear shaft assembly. The driving intermediate gears in each intermediate gear shaft assembly are all meshed, and the driven intermediate gears in each intermediate gear shaft assembly are meshed with the output gear, and the driving gear and the output gear are arranged eccentrically. The wheel motor drive axle includes the wheel motor drive system. The wheel side motor drive system and the wheel side motor drive axle have the advantages of high motor power, large torque and large width of the middle channel.

Description

A wheel-side motor drive system, and a wheel-side motor drive axle

technical field

The utility model relates to the field of automobiles, in particular to a wheel-side motor drive system and a wheel-side motor drive bridge.

Background technique

With the gradual withering of oil resources and the gradual increase of air pollution, the society is increasingly calling for new energy vehicles, including pure electric, hybrid, plug-in, fuel cell and other forms of vehicles. New energy vehicles greatly reduce the impact on Oil dependence and air pollution. Compared with traditional internal combustion engine vehicles, new energy vehicles have undergone tremendous changes in both the general layout of the vehicle and the drive system assembly due to the different forms of energy supply. The drive system assembly is crucial to the vehicle. Important, it not only undertakes the carrying function and driving function, but also directly determines the safety and comfort performance of the vehicle.

At present, the structure of most vehicle drive systems (especially the drive system of new energy vehicles) is that the central motor is connected to a traditional rear axle through the transmission shaft. The floor layout needs to achieve drive anti-skid control and body stability control through braking, and the wheel motor drive axle has become an important research direction at home and abroad. This drive axle generally includes drive motors, reducer mechanisms, wheel hubs and other components. , replacing the engine, clutch, gearbox, transmission shaft, differential and other components, simplifying the overall mechanism and improving transmission efficiency.

However, the existing wheel-side motor drive axles and the wheel-side motor drive systems therein have disadvantages such as low motor power, low torque, low speed, heavy weight, narrow middle channel, and high noise.

Utility model content

(1) Technical problems to be solved

The technical problem to be solved by the utility model is to provide a wheel-side motor drive system and a wheel-side motor drive bridge with high motor power, large torque and wide middle channel.

(2) Technical solutions

In order to solve the above-mentioned technical problems, the utility model provides a wheel motor drive system on the one hand, including a driving motor assembly and a final reducer assembly, and the final reducer assembly includes a driving gear, at least two intermediate gear shaft assemblies and Output gears, each intermediate gear shaft assembly has a driving intermediate gear and a driven intermediate gear connected together in a co-rotating manner; wherein, the motor output shaft of the drive motor assembly is connected to the driving gear in a manner of transmitting power, The driving gear meshes with the driving intermediate gear in each intermediate gear shaft assembly, and the driven intermediate gear in each intermediate gear shaft assembly meshes with the output gear, and the driving gear and the output gear are arranged eccentrically.

According to the utility model, the driving gear and the output shaft of the motor are cantilevered.

According to the present invention, the final reducer assembly further includes: a housing, and the driving gear, at least two intermediate gear shaft assemblies and the output gear are arranged in the housing.

According to the utility model, it also includes a wheel reducer assembly and a wheel hub assembly; the wheel reducer assembly includes a sun gear shaft, a planetary wheel, a wheel reducer casing, a planet carrier and a ring gear arranged on the housing, and the output gear is The way of power transmission is connected with the shaft of the sun gear, the shaft of the sun gear meshes with the planetary gear, the planetary gear is set on the planet carrier and meshes with the ring gear in the way of power transmission, the planet carrier is set in the wheel reducer casing in the way of power transmission, and the wheel reducer The shell is connected with the wheel hub assembly in the way of power transmission; the wheel hub assembly is arranged on the shell.

According to the utility model, the end cover of the wheel reducer assembly has a bearing and a limit block, and the limit block has a protruding part opposite to the supporting surface, and the protruding part is inserted into the inner ring of the bearing, and the sun The wheel shaft breaks away from the support surface when it rotates forward, and abuts against the support surface when it reverses.

According to the utility model, the front end cover of the driving motor assembly is provided with a gear frame, and the gear frame and the front end cover together form an accommodation space, the front end cover is provided with at least one first support hole, and the gear frame has at least one second support hole, At least one first support hole is in one-to-one correspondence with at least one second support hole, and the corresponding first support hole and the second support hole are formed by one-time processing, and the accommodation space is located between the first support hole and the second support hole ; Wherein, each intermediate gear shaft assembly and the output gear are supported on the corresponding first support hole and the second support hole through bearings.

Another aspect of the utility model discloses a wheel-side motor drive axle, which includes any one of the above-mentioned wheel-side motor drive systems.

According to the utility model, it also includes: a crossbeam, two wheel-side motor drive systems are symmetrically connected to both ends of the crossbeam; and a thrust rod bracket, which is arranged on the crossbeam perpendicular to the extension direction of the crossbeam.

According to the utility model, it also includes: a crossbeam, two wheel-side motor drive systems are symmetrically connected to both ends of the crossbeam; and a cooling hose and a cooling steel pipe extending along the extension direction of the crossbeam, both of which are arranged in the middle of the crossbeam.

According to the utility model, it also includes: a crossbeam, on which openings are arranged, and two wheel-side motor drive systems are symmetrically connected to both ends of the crossbeam.

(3) Beneficial effects

The above-mentioned technical scheme of the utility model has the following advantages:

The wheel motor drive system of the present utility model includes a driving motor assembly and a main reducer assembly. The main reducer assembly includes a driving gear, at least two intermediate gear shaft assemblies and an output gear. Each intermediate gear shaft assembly Each has a driving intermediate gear and a driven intermediate gear connected together for common rotation. Wherein, the motor output shaft of the driving motor assembly is connected with the driving gear to transmit power to the driving gear, and then drives the driving gear to rotate. The driving gear meshes with the driving intermediate gear in each intermediate gear shaft assembly for power splitting, the driven intermediate gear in each intermediate gear shaft assembly meshes with the output gear for power converging, and the driving gear and the output Gear eccentric setting. As a result, the volume of the main reducer assembly is reduced, the space of the main reducer is effectively used, the axial dimension of the main reducer is reduced, and the speed ratio is increased, the motor power is increased, the output torque is increased, and the output torque is increased. The middle channel width is increased.

The wheel side motor driving system of the present invention also includes a wheel side reducer assembly and a wheel hub assembly, and the wheel side reducer assembly includes a sun gear shaft, a planetary wheel, a wheel reducer shell, a planet carrier, and a ring gear. The output gear is connected with the sun gear shaft to transmit power to the sun gear shaft, and then drives the sun gear shaft to rotate. The sun gear shaft meshes with the planet gears to drive the planet gears to rotate. The planetary gear is arranged on the planetary carrier to transmit power to the planetary carrier, and then drives the planetary carrier to rotate, and the planetary gear meshes with the ring gear arranged on the housing of the final reducer assembly, thereby providing support and guidance for the planetary gear. The planet carrier is arranged in the wheel casing to transmit power to the wheel casing, and then drives the wheel casing to rotate. The wheel reducer is connected with the hub assembly to transmit power to the hub assembly. Thus, the output gear drives the shaft of the sun gear to rotate, and the rotation of the shaft of the sun gear drives the rotation of the planetary gear to drive the rotation of the planetary carrier and the wheel casing. The wheel casing transmits the power to the wheel hub assembly, effectively utilizing the rim space and increasing the speed ratio. .

The end cover of the wheel side reducer assembly in the wheel side motor drive system of the utility model is provided with a bearing and a limit block, the limit block has a supporting surface and a protruding part opposite to the supporting surface, and the protruding part is inserted Connected to the inner ring of the bearing, the sun gear shaft disengages from the support surface when it rotates forward, and abuts against the support surface when it rotates reversely. Thus, compared with the prior art, the sun gear shaft is freed from the shackles of the bearing, and can float radially (direction perpendicular to the axial direction of the sun gear shaft) when rotating. Moreover, the sun gear shaft will not produce axial play because it is constructed as a helical tooth.

The front end cover of the drive motor assembly in the wheel side motor drive system of the present utility model is provided with a gear frame. Since the corresponding first support hole and the second support hole on the front end cover and the gear frame are processed and formed at one time, so The coaxiality of the first support hole and the second support hole serving as the bearing seat can be guaranteed. Therefore, by adopting this gear frame structure, the installation accuracy of at least two intermediate gear shaft assemblies and the output gear is improved, which is beneficial to adjustment, reduces the noise of at least two intermediate gear shaft assemblies and the output gear, and improves the ride comfort.

The wheel-side motor drive bridge of the present invention includes the wheel-side motor drive system of the present invention, and therefore has all the advantages of the wheel-side motor drive system of the present invention.

The thrust rod support of the wheel-side motor drive bridge of the utility model is arranged on the cross beam perpendicular to the extension direction of the cross beam, which transmits the longitudinal force of the cross beam and increases the rigidity of the cross beam.

The center of the crossbeam of the wheel-side motor drive bridge of the utility model is provided with a cooling hose and a cooling steel pipe extending along the extension direction of the crossbeam, compared with the way in the prior art that each end of the crossbeam is provided with a cooling hose and a cooling steel pipe, The utility model simplifies the pipeline system structure and reduces the risk of leakage.

Openings are arranged on the beam of the wheel-side motor drive bridge of the utility model. The opening can not only improve the heat dissipation performance of the motor, but also have the function of drainage and sewage discharge, and can reduce the amount of materials used to realize the weight reduction of the drive axle of the wheel-side motor.

Description of drawings

Fig. 1 is a top view of an embodiment of the wheel motor drive axle of the present invention, which includes an embodiment of the wheel variable motor drive system of the present invention;

Fig. 2 is a working principle diagram of the wheel motor drive system shown in Fig. 1;

Fig. 3 is a structural principle diagram of the main reducer assembly in the wheel motor drive system shown in Fig. 1;

Fig. 4 is a three-dimensional schematic diagram of the front end cover and the gear frame of the drive motor assembly in the wheel motor drive system shown in Fig. 1;

Fig. 5 is another perspective view of the front end cover and the gear frame of the drive motor assembly in the wheel motor drive system shown in Fig. 1;

Fig. 6 is a structural principle diagram of the wheel speed reducer assembly in the wheel motor drive system shown in Fig. 1;

Fig. 7 is a schematic partial cross-sectional view of the wheel reducer assembly at the end cover in the wheel motor drive system shown in Fig. 1;

Fig. 8 is a three-dimensional schematic diagram of the limit block of the wheel speed reducer assembly in the wheel motor drive system shown in Fig. 1;

Fig. 9 is a structural schematic view of the brake disc installed on the wheel hub in the wheel motor drive system shown in Fig. 1;

In the figure, 1: beam; 2: drive motor assembly; 3: left airbag arm; 4: final reducer assembly; 5: hub assembly; 6: wheel reducer assembly; 7: air brake assembly; 8: Right airbag arm; 9: Thrust rod bracket; 10: Cooling hose; 11: Cooling steel pipe; 12: Sun gear shaft; 13: Driving gear; 14: First intermediate gear shaft assembly; 15: Second intermediate gear shaft Assembly; 16: Output gear; 17: End cover structure; 18: Planetary gear; 19: Opening; 20: Gear frame; 21: Ring gear; 22: Wheel reducer; 23: Brake; 24: Front cover; 25 : accommodation space; 26: positioning pin; 27: bolt; 28: brake disc; 29: wheel hub; 30: screw; 31: planet carrier 31; 171: end cover; 172: bearing; 173: limit block; 174 : supporting surface; 175: extension; 176: first groove; 177: second groove; 201: second supporting hole; 241: first supporting hole.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model. "Left" and "right" that the utility model relates to are all based on the orientation of Fig. 1 .

Referring to FIG. 1 , an embodiment of the wheel-side motor drive axle of the present invention includes an embodiment of the wheel-side motor drive system of the present invention.

Wherein, referring to FIGS. 1 to 5 , in this embodiment, the wheel motor drive system includes a drive motor assembly 2 and a final reducer assembly 4 .

Specifically, the final reducer assembly 4 includes a driving gear 13, at least two intermediate gear shaft assemblies and an output gear 16, each intermediate gear shaft assembly has a driving intermediate gear and a driven intermediate gear, and the driving intermediate gear and the driven intermediate gear The driving intermediate gear is connected together in a manner of co-rotation (preferably, the driving intermediate gear and the driven intermediate gear are welded after matching teeth).

In addition, the motor output shaft of the drive motor assembly 2 is connected with the driving gear 13 in a manner of transmitting power (preferably the driving gear 13 and the motor output shaft are cantilevered to reduce the bearings used here in the prior art, thereby simplifying the structure , and the driving gear 13 is splined with the motor output shaft), and the motor output shaft drives the driving gear 13 to rotate. The driving gear 13 is in mesh with the driving intermediate gears in each intermediate gear shaft assembly to split power. The driven intermediate gear in each intermediate gear shaft assembly meshes with the output gear 16 for power confluence. In addition, the driving gear 13 and the output gear 16 are arranged eccentrically. It can be understood that the above-mentioned driving gear 13 , at least two intermediate gear shaft assemblies and the output gear 16 constitute an input and output eccentric multiple intermediate shaft structure.

Thus, the volume of the main reducer assembly 4 is reduced, the space of the main reducer is effectively utilized, the axial size of the main reducer is reduced, and the speed ratio is increased, the motor power is increased, the output torque is increased, The middle channel width has been increased.

Preferably, the teeth of all the gears in the final drive assembly 4 are configured as helical teeth. And preferably, the above-mentioned at least two intermediate gear shaft assemblies are two intermediate gear shaft assemblies (respectively the first intermediate gear shaft assembly 14 and the second intermediate gear shaft assembly 15), thus, the above-mentioned driving gear 13, The two intermediate gear shaft assemblies and the output gear 16 form an input and output eccentric double intermediate shaft structure.

Further, referring to Fig. 4 and Fig. 5, in this embodiment, there is a gear frame 20 on the front end cover 24 of the drive motor assembly 2, the front end cover 24 is provided with at least one first support hole 241, and the gear frame 20 has at least one The second support hole 201 , the gear frame 20 and the front end cover 24 together form a receiving space 25 . Wherein, the at least one first support hole 241 corresponds to the at least one second support hole 201 one by one, that is, one first support hole has one and only one second support hole opposite to it. Moreover, the corresponding first support hole 241 and the second support hole 201 are formed by one-time processing, that is, the first support hole 241 and the second support hole 201 are formed by one-time processing after the gear carrier is installed on the front end cover 24 . The accommodating space 25 is located between the first supporting hole 241 and the second supporting hole 201 , and the accommodating space 25 is used for accommodating the gear supported between the first supporting hole 241 and the second supporting hole 201 . Thus, since the corresponding first support hole 241 and the second support hole 201 are formed by one-time processing, the coaxiality of the first support hole 241 and the second support hole 201 as the bearing seat can be ensured. Each intermediate gear shaft assembly and output gear are supported on the corresponding first supporting hole 241 and the second supporting hole 201 through bearings. The above-mentioned gear support structure improves the installation accuracy of at least two intermediate gear shaft assemblies and the output gear, facilitates adjustment, reduces the noise of at least two intermediate gear shaft assemblies and the output gear, and improves ride comfort. . It can be understood that when applied to the wheel motor drive system of the present invention, the number, size and position of the first support hole 241 and the second support hole 201 are matched with each intermediate gear shaft assembly and output gear. Of course, the number, size and position of the first support holes 241 and the second support holes 201 are set according to actual needs.

Specifically in this embodiment, the gear carrier 20 is bolted to the front end cover 24 (for example, via bolts 27 in FIG. 4 ). Of course, in other optional embodiments, the gear frame 20 and the front end cover 24 can be detachably connected in other ways.

Preferably, the gear carrier 20 and the front end cover 24 are positioned by at least one positioning pin 26 . Therefore, the two can be connected conveniently and accurately, thereby ensuring the coaxiality of the first support hole and the second support hole processed later. Preferably, it is positioned by 3 positioning pins.

In addition, the wheel motor drive system shown in FIG. 1 also includes a wheel reducer assembly 6 and a wheel hub assembly 5 . Specifically, referring to FIG. 2 and FIG. 6 , the wheel reducer assembly 6 includes a sun gear shaft 12 , a planetary gear 18 , a wheel reduction housing 22 and a planet carrier 31 . Wherein, the output gear 16 is connected with the sun gear shaft 12 in the way of power transmission, so as to drive the sun gear shaft 12 to rotate. The sun gear shaft 12 meshes with the planetary gear 18 to drive the planetary gear 18 to rotate. The planetary gear 18 is arranged on the planetary carrier 31 in a manner of transmitting power to drive the planetary carrier 31 to rotate. The planet carrier 31 is arranged in the wheel casing 22 in a power transmission manner to drive the wheel casing 22 to rotate. The wheel reducer 22 is connected with the wheel hub assembly 5 in a manner of transmitting power, so as to transmit the power to the wheel hub assembly 5 . Preferably, the sun gear shaft 12 is connected to the output gear 16 through a half shaft. More preferably, the sun gear shaft 12 is integrally connected with the above-mentioned half shaft.

Thus, the output gear 16 drives the sun gear shaft 12 to rotate, and the rotation of the sun gear shaft 12 drives the rotation of the planetary gear 18 to push the planetary carrier 31 and the wheel shell 22 to rotate, and the wheel shell 22 transmits power to the hub assembly 5, effectively utilizing Increased rim space increases speed ratio.

In summary, it can be understood that the motor output shaft of the driving motor assembly 2 is connected to the driving gear 13 of the main reducer assembly 4, and the power is transmitted to the main reducer assembly 4. The speed decreases and the torque increases, and then the output gear 16 of the main reducer assembly 4 is connected to the sun gear shaft 12, and the power is transmitted to the wheel reducer assembly 6, and the speed and torque are further reduced through the wheel reducer assembly 6. To increase the torque, the wheel reducer assembly 6 is connected to the wheel hub assembly 5, so as to transmit power to the wheel hub, thereby driving the rotation of the wheel. Thus, by arranging the above-mentioned final reducer assembly 4 and wheel side reducer assembly 6, the transmission chain is reduced and the transmission efficiency is improved. And the whole wheel side motor driving system is compact in structure and saves space.

Preferably, as shown in Figures 7 and 8, the end cover 171 of the wheel reducer assembly 6 in the wheel motor drive system is provided with a bearing 172 and a limit block 173, and the limit block 173 has a support surface 174 With the projection 175 arranged opposite to the support surface 174 , the projection 175 is plugged into the inner ring of the bearing 172 . The above-mentioned end cover 171, bearing 172, and limit block 173 constitute an end cover structure 17. When the end cover structure 17 is used in the wheel-side reducer assembly, the sun gear shaft 12 is in contact with the supporting surface 174 when it rotates forward. disengages, and abuts against support surface 174 when it is reversed. Compared with the prior art, the sun gear shaft is free from the shackles of the bearing, and can float radially (direction perpendicular to the axial direction of the sun gear shaft) when rotating. Moreover, the sun gear shaft will not produce axial play because it is constructed as a helical tooth. Wherein, the forward rotation of the sun gear shaft 12 is one of clockwise rotation and counterclockwise rotation, and the reverse rotation of the sun gear shaft 12 is another.

Further, in this embodiment, the supporting surface 174 of the limiting block 173 is provided with an oil channel, and the oil channel has an inlet that penetrates the outer peripheral surface of the limiting block 173 and allows lubricating oil to flow in, and penetrates the outer peripheral surface of the limiting block 173 And the outlet for lubricating oil to flow out. Thus, lubricating oil around the limiting block 173 can flow in from the inlet, flow between the support surface 174 and the end surface of the sun gear shaft 12, and then flow out of the limiting block from the outlet. In this way, the friction between the limit block 173 and the end surface of the sun gear shaft 12 can be reduced, and the damage of both during operation can be reduced.

Further, in this embodiment, the oil channel includes a first groove 176 and at least two second grooves 177, the first groove 176 is located in the center of the supporting surface, and one end of the second groove 177 is connected to the first groove. The groove 176 is connected, and the other end passes through the outer peripheral surface of the limiting block 173 . Thus, one end of a part of the at least two second grooves 177 serves as the inlet of the oil passage, and one end of the other part of the at least two second grooves 177 serves as the outlet of the oil passage. Preferably, at least two second grooves 177 are evenly arranged around the first groove 176 . More preferably, in this embodiment, four second grooves 177 are provided. Of course, the arrangement of the oil passages is not limited to the above-mentioned embodiments. In other optional embodiments, the shape of the oil passages, the number of inlets and outlets, and the area ratio of the oil passages to the supporting surface can be configured according to actual needs. In addition, in this embodiment, the bearing 172 is an angular contact bearing.

Further, specific to this embodiment, the final reducer assembly 4 also includes a housing, and the gear frame 20 on the front end cover of the above-mentioned driving motor assembly 2 is arranged in the housing, so that at least two intermediate gear shaft assemblies and The output gears 16 are all disposed in the housing. In addition, a driving gear 13 is also provided in the housing. That is to say, the driving gear 13, at least two intermediate gear shaft assemblies and the output gear 16 are all arranged in the housing. Preferably, the above-mentioned casing is an integral structure.

The hub assembly 5 is also arranged on the housing through bearings. The drive motor assembly 2 is also mounted on the housing, wherein the drive motor assembly 2 can be permanent magnet synchronous, AC asynchronous or other forms. Of course, the utility model is not limited thereto. In other optional embodiments, the hub assembly 5 and the drive motor assembly 2 can also be installed on other parts of the final reducer assembly 4 (parts other than the housing) superior.

The wheel reducer assembly 6 also includes a ring gear 21 in this embodiment, and the ring gear 21 is also arranged on the housing, and the planetary gear 18 meshes with the ring gear 21 . As a result, the planet wheels 18 are also supported on the housing. Of course, it is not limited thereto, and the ring gear 21 can also be arranged on other components (except the housing) of the final drive assembly 4 to support the planetary gear 18 on other components of the final drive assembly 4 ( parts other than the housing).

In addition, in this embodiment, the wheel motor drive system also includes an air brake assembly 7 , which is connected to the housing of the final reducer assembly 4 and cooperates with the brake disc of the wheel hub assembly 5 . Thus, the braking of the hub is realized. Wherein, preferably, the brake disc of the hub assembly 5 is a ventilated disc.

Further, referring to FIG. 9 , a through hole is provided on the brake disc 28 , and a threaded hole is provided on the hub 29 , and a threaded member 30 is screwed through the through hole and threaded into the threaded hole. Thus, overcome the prior art (the through hole is provided on the wheel hub, the threaded hole is set on the brake disc, the threaded part is threaded through the through hole and the threaded hole by the inside of the wheel hub, the inside of the wheel hub is a sealed cavity, and The problem of oil leakage in the through hole communication) and simplifies the structure. In this embodiment, the threaded member 30 is preferably a bolt.

Further referring to FIG. 1 , in this embodiment, the wheel-side motor drive axle includes the above-mentioned wheel-side motor drive system. Thereby have all advantages of above-mentioned edge motor drive system.

In addition, in this embodiment, the wheel-side motor drive axle also includes a crossbeam 1, an airbag arm for supporting the air suspension (respectively, the left airbag arm 3 and the right airbag arm 8 located at both ends of the crossbeam 1), cooling hoses 10, cooling steel pipe 11, thrust rod support 9.

Wherein, in the present embodiment, two above-mentioned wheel edge motor drive systems are symmetrically connected at the two ends of crossbeam 1, and four airbag arms are symmetrically arranged at the two ends of crossbeam 1 (four airbag arms include two left airbag arms 3 and two right airbag arms 8), preferably, one end of the left airbag arm 3 and the right airbag arm 8 is connected to the crossbeam 1, on which an airbag installation point is provided and a reinforcing rib is provided.

Preferably, the thrust rod bracket 9 is arranged on the beam 1 perpendicular to the extending direction of the beam 1 . The "extending direction of the beam 1" is the lateral direction of the vehicle when the beam 1 is installed in the vehicle. The thrust rod bracket 9 transmits the longitudinal force of the beam and increases the rigidity of the beam.

Preferably, a cooling hose 10 and a cooling steel pipe 11 extend along the extension direction of the beam and are arranged in the middle of the beam 1 . Compared with the way in the prior art that cooling hoses and steel pipes are arranged at each end of the beam, the utility model simplifies the structure of the pipeline system and reduces the risk of leakage.

And preferably, the beam 1 is connected to the housing of the final reducer assembly 4 in the wheel motor drive system.

In addition, preferably, openings are provided on the beam 1 , more preferably, a plurality of openings are uniformly provided on the beam. The opening can not only improve the heat dissipation performance of the motor, but also have the function of drainage and sewage discharge, and can reduce the amount of materials used to realize the weight reduction of the drive axle of the wheel-side motor. By changing the transverse dimension of the crossbeam 1, it is possible to match vehicle models with different wheelbases, and by changing the thickness of the crossbeam 1, it is possible to meet the requirements of vehicles with different axle loads.

To sum up, in a vehicle with the wheel motor drive axle and the wheel motor drive system of the present invention, the drive motor assembly 2 can also be controlled to realize energy recovery when the vehicle goes downhill and when braking. In addition, the drive anti-slip control and body stability control of the vehicle can also be realized by separately controlling the torques of the drive motors of the two wheel-side motor drive systems.

Preferably, the wheel-side motor drive axle and the wheel-side motor drive system of the present invention are applied to new energy low-floor vehicles, especially suitable for high-end urban low-floor buses and high-end tourist buses.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the various embodiments of the present invention. and range.

Claims (10)

1. a wheel motor drive system, comprises drive motor assembly (2) and main gearbox assembly (4), it is characterized in that:

Described main gearbox assembly (4) comprises driving gear (13), at least two intermediate gear axle assemblies and output gear (16), and each described intermediate gear axle assembly all has the active intermediate gear and driven intermediate gear that link together in co-rotational mode;

Wherein, the motor output shaft of described drive motor assembly (2) is connected with described driving gear (13) in the mode of transferring power, described driving gear (13) all engages with the active intermediate gear in each described intermediate gear axle assembly, driven intermediate gear in each described intermediate gear axle assembly all engages with described output gear (16), and described driving gear (13) and described output gear (16) eccentric setting.

2. wheel motor drive system according to claim 1, is characterized in that:

Described driving gear (13) and described motor output shaft cantilever are arranged.

3. wheel motor drive system according to claim 1 and 2, is characterized in that, described main gearbox assembly (4) also comprises:

Housing, described driving gear (13), described at least two intermediate gear axle assemblies and described output gear (16) are arranged in described housing.

4. wheel motor drive system according to claim 3, is characterized in that, also comprises wheel reduction gear assembly (6) and Hub assembly (5);

Described wheel reduction gear assembly (6) comprises sun wheel shaft (12), satellite gear (18), wheel subtracts shell (22), pinion carrier (31) and the gear ring (21) arranged on the housing, described output gear (16) is connected with described sun wheel shaft (12) in the mode of transferring power, described sun wheel shaft (12) engages with described satellite gear (18), described satellite gear (18) is arranged on described pinion carrier (31) in the mode of transferring power and goes up and engage with described gear ring (21), described pinion carrier (31) is arranged on described wheel in the mode of transferring power and subtracts in shell (22), described wheel subtracts shell (22) and is connected with described Hub assembly (5) in the mode of transferring power,

Described Hub assembly (5) is arranged on the housing.

5. wheel motor drive system according to claim 4, is characterized in that:

The end cap (171) of described wheel reduction gear assembly (6) is provided with bearing (172) and limiting stopper (173), described limiting stopper (173) has bearing surface (174) extension (175) that arrange contrary to described bearing surface (174), described extension (175) is plugged in the inner ring of described bearing (172), described sun wheel shaft (12) when it rotates forward and described bearing surface (174) depart from and when it reverses and described bearing surface (174) lean.

6. wheel motor drive system according to claim 1, is characterized in that:

The front end cover (24) of described drive motor assembly (2) is provided with tooth rest (20), described tooth rest (20) and described front end cover (24) form spatial accommodation (25) jointly, described front end cover (24) has at least one first supported hole (241), described tooth rest (20) has at least one second supported hole (201), at least one first supported hole (241) described and at least one the second supported hole (201) one_to_one corresponding described, and corresponding the first supported hole (241) and the second supported hole (201) are that time processing is shaping, described spatial accommodation is positioned on described first supported hole (241) and described second supported hole (201),

Wherein, each described intermediate gear axle assembly and described output gear all by bearings on corresponding described first supported hole (241) and described second supported hole (201).

7. a wheel motor drive axle, is characterized in that, comprises the wheel motor drive system according to any one of claim 1-6.

8. wheel motor drive axle according to claim 7, is characterized in that, also comprise:

Crossbeam (1), two described wheel motor drive system symmetries are connected to the two ends of described crossbeam (1); And

Track bar bracket, its bearing of trend perpendicular to described crossbeam (1) is arranged on described crossbeam (1).

9. wheel motor drive axle according to claim 7, is characterized in that, also comprise:

Crossbeam (1), two described wheel motor drive system symmetries are connected to the two ends of described crossbeam (1); And

The cooling tube (10) extended along the bearing of trend of described crossbeam (1) and cooling pipe (11), the two is arranged on the centre of described crossbeam (1).

10. wheel motor drive axle according to claim 7, is characterized in that, also comprise:

Crossbeam (1), is provided with opening (19) at described crossbeam (1), and two described wheel motor drive system symmetries are connected to the two ends of described crossbeam (1).