CN214267335U

CN214267335U - Electric motor car and coaxial-type drive structure thereof

Info

Publication number: CN214267335U
Application number: CN202023222282.XU
Authority: CN
Inventors: 肖福禄; 吴刚
Original assignee: Chongqing Jianan Industry And Trade Co ltd
Current assignee: Chongqing Jianan Industry And Trade Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-09-24
Anticipated expiration: 2030-12-28

Abstract

The utility model provides an electric vehicle and a coaxial driving structure thereof, which comprises a shell, a power shaft, a driving motor, a differential mechanism and an output shaft; the stator of the driving motor is fixed on the shell, and the rotor is fixed on the power shaft; the power shaft is a hollow shaft, the differential mechanism and the power shaft are coaxially arranged, the output shaft penetrates through the power shaft and is in transmission connection with one side of the differential mechanism, and the power shaft is in transmission connection with the differential mechanism. After a stator on the shell is electrified, the rotor drives the power shaft to rotate, the power shaft transmits power to the ring gear of the differential mechanism through the transmission structure, and then the differential mechanism drives the two output shafts to rotate to output power. One of the output shafts rotates relative to the power shaft. The utility model provides an electric motor car drive structure that exists among the prior art radially occupation space is big, the problem of noise is not stable enough.

Description

Electric motor car and coaxial-type drive structure thereof

Technical Field

The utility model relates to an electric motor car technical field especially relates to electric motor car and electric motor car drive structure.

Background

With the decreasing of petroleum resources and the increasing of air pollution, the country is beginning to strongly advocate the use of electric vehicles instead of fuel vehicles. The transmission structure of the electric vehicle is greatly different from that of the fuel vehicle. The fuel vehicle transmits the power of the engine in front to the rear axle through the transmission shaft, while the electric vehicle can directly install the motor and the speed reducing structure on the rear axle, so that the power is more direct.

At present, when the electric motor car transmission design, fix the one side at rear axle middle part with motor and reduction structure mostly, this kind of setting leads to electric motor car drive structure radial symmetry to hang down, and the many transmission efficiencies of radial transmission structure are low, and occupation space is more and whole stable inadequately, and the noise is big.

SUMMERY OF THE UTILITY MODEL

Not enough to exist among the prior art, the utility model provides a coaxial-type electric motor car drive structure, it is big that its electric motor car drive structure who has solved existence among the prior art radially occupation space, the problem of noise is not stabilized enough.

According to an embodiment of the utility model, a coaxial electric vehicle driving structure comprises a shell, a power shaft, a driving motor, a differential mechanism and an output shaft; the stator of the driving motor is fixed on the shell, and the rotor is fixed on the power shaft; the power shaft is a hollow shaft, the differential mechanism and the power shaft are coaxially arranged, the output shaft penetrates through the power shaft and is in transmission connection with one side of the differential mechanism, and the power shaft is in transmission connection with the differential mechanism.

The electric vehicle with the driving structure is further provided, and the output shaft is in transmission connection with the hub.

The technical principle of the utility model is that: after a stator on the shell is electrified, the rotor drives the power shaft to rotate, the power shaft transmits power to the ring gear of the differential mechanism through the transmission structure, and then the differential mechanism drives the two output shafts to rotate to output power. One of the output shafts rotates relative to the power shaft.

Compared with the prior art, the utility model discloses following beneficial effect has: the utility model integrates the driving motor directly to the shell and the power shaft for driving, and utilizes the hollow arrangement of the power shaft, thereby avoiding the increase of radial space caused by radial dislocation arrangement between the power shaft and the output shaft and increasing the transmission efficiency; meanwhile, the transmission structure is arranged in the same shell, so that the required installation space is greatly reduced; meanwhile, the output shaft does not influence the transmission connection between the power shaft and the differential mechanism. The connection makes the whole structure compact; the coordination is good, and simultaneously, the stability is good, and the working noise is small.

Drawings

Fig. 1 is an external structural view of an embodiment of the present invention.

Fig. 2 is a schematic view of the internal connection of the present invention.

In the above drawings: 1. a housing; 2. a power shaft; 3. an output shaft; 4. a differential mechanism; 5. a deceleration shaft; 6. a rotor; 21. a power gear; 41. a ring gear; 51. a first reduction gear; 52. a second reduction gear.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.

As shown in fig. 1-2, an embodiment of the present invention provides a coaxial electric vehicle driving structure, which includes a housing 1, a power shaft 2, a driving motor, a differential 4, and an output shaft 3; the stator of the driving motor is fixed on the shell 1, and the rotor 6 is fixed on the power shaft 2; the power shaft 2 is a hollow shaft; the differential mechanism 4 and the power shaft 2 are coaxially arranged, the output shaft 3 penetrates through the power shaft 2 to be in transmission connection with one side of the differential mechanism 4, and the power shaft 2 is in transmission connection with the differential mechanism 4.

According to the scheme, the working principle of the invention is that after the stator on the shell 1 is electrified, the rotor 6 drives the power shaft 2 to rotate, the power shaft 2 transmits power to the ring gear 41 of the differential 4 through the transmission structure, and then the differential 4 drives the two output shafts 3 to rotate to output power. One of the output shafts 3 is relatively rotated inside the power shaft 2. The design of passing through the hollow shaft of the power shaft 2 and the output shaft 3 reduces the radial transmission structure, integrates the transmission structure and the driving motor together, and greatly reduces the radial space occupation.

Further, the differential 4 is connected with the power shaft 2 through a speed reducing structure. For common three-wheel and four-wheel electric vehicles, the output shaft 3 is directly driven by the motor to output, and the power of the motor is relatively insufficient; the utility model discloses do not directly fix rotor 6 on output shaft 3, but drive to differential mechanism 4 through the transmission of speed reduction structure, overcome the problem of power deficiency.

As shown in fig. 2, in a specific arrangement, in one embodiment, the speed reducing structure includes a speed reducing shaft 5 and a power gear 21, the power gear 21 is circumferentially fixed to the power shaft 2, a first speed reducing gear 51 and a second speed reducing gear 52 are disposed on the speed reducing shaft 5, the first speed reducing gear 51 and the power gear 21 are engaged, and the number of teeth of the first speed reducing gear is greater than that of the power gear 21, and the second speed reducing gear 52 and the ring gear 41 of the differential 4 are engaged, and the number of teeth of the second speed reducing gear is smaller than that of the ring gear 41. The effect of increasing the driving force is achieved by the two times of transmission deceleration by the deceleration shaft 5.

In another embodiment, the speed reducing structure comprises a planetary speed reducing structure, and the power shaft 2 is provided with a power gear 21 and is used as a sun gear of the planetary speed reducing structure; the ring gear 41 of the differential 4 is in transmission connection with a sun gear of a planetary reduction structure, and a planetary wheel of the planetary reduction structure is rotatably connected to the shell 1 around the axis of the planetary wheel. The mode realizes speed reduction through a planetary structure, and can ensure the integral symmetry degree, so that the rear axle is integrally closer to a revolving body, and all parts are relatively balanced. As for the connection mode of the ring gear 41 and the gear ring, a transmission structure can be arranged for further speed reduction, and the connection mode can also be directly realized in a relatively fixed mode.

Further, the power gear 21 is located at an end of the power shaft 2, the power shaft 2 is rotatably connected with the housing 1 through a bearing, and the bearing is disposed close to the power gear 21. The power gear 21 is arranged at the end part of the power shaft 2, so that the axial space for arranging the rotor 6 can be made, the whole structure is more compact, meanwhile, the power shaft 2 bears certain axial force, and the bearing is arranged close to the power gear 21, so that stable support can be ensured. Similarly, both ends of the differential 4 are rotatably connected to the housing 1, so that the connection stability is ensured. In actual arrangement, two output shafts 3 are respectively connected to two ends of the differential 4. In the case of an electric vehicle differential 4, the output shaft 3 is usually splined to splined holes at both ends of the differential 4.

Finally the utility model provides an electric motor car including above-mentioned drive structure, output shaft 3 be the wheel hub axle or be connected with the wheel hub transmission. The electric vehicle has the advantages of low noise and high transmission efficiency.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. The utility model provides a coaxial-type electric motor car drive structure which characterized in that: comprises a shell, a power shaft, a driving motor, a differential and an output shaft; the stator of the driving motor is fixed on the shell, and the rotor is fixed on the power shaft; the power shaft is a hollow shaft, the differential mechanism and the power shaft are coaxially arranged, the output shaft penetrates through the power shaft and is in transmission connection with one side of the differential mechanism, and the power shaft is in transmission connection with the differential mechanism.

2. A coaxial electric vehicle drive structure according to claim 1, wherein said differential is connected to said power shaft through a speed reduction structure.

3. The coaxial electric vehicle driving structure according to claim 2, wherein the speed reduction structure comprises a speed reduction shaft and a power gear, the power gear is circumferentially fixed to the power shaft, the speed reduction shaft is provided with a first speed reduction gear and a second speed reduction gear, the first speed reduction gear is meshed with the power gear, the number of teeth of the first speed reduction gear is greater than that of the power gear, and the second speed reduction gear is meshed with the ring gear of the differential, and the number of teeth of the second speed reduction gear is smaller than that of the ring gear.

4. The coaxial electric vehicle driving structure according to claim 2, wherein the speed reducing structure comprises a planetary speed reducing structure, the power shaft is provided with a power gear and serves as a sun gear of the planetary speed reducing structure; the ring gear of the differential mechanism is in transmission connection with the sun gear of the planetary reduction structure, and the planet gear of the planetary reduction structure is rotatably connected to the shell around the axis of the planet gear.

5. A coaxial electric vehicle drive structure as defined in claim 3 or 4, wherein said power gear is located at an end of a power shaft, said power shaft being rotatably connected to the housing through a bearing, said bearing being disposed adjacent to said power gear.

6. A coaxial electric vehicle drive structure according to claim 3 or 4, wherein said differential is rotatably connected at both ends to the housing.

7. An electric vehicle comprising a drive arrangement according to any of claims 1 to 6, the output shaft being in driving connection with a hub.