Double-motor electric drive system

Abstract

The utility model discloses a double-motor electric drive system which comprises a speed reducer shell, a first motor, a second motor, a first output shaft, a second output shaft, a first planetary gear train, a first gear, a second planetary gear train and a second gear. The first output shaft is provided with a first output shaft end gear, the second output shaft is provided with a second output shaft end gear, the first planetary gear train and the second planetary gear train are both installed on the speed reducer shell, the first gear is meshed with the first output shaft end gear, the first motor is connected with the first gear through the first planetary gear train, and the second motor is connected with the second planetary gear train through the second output shaft end gear. The second gear is meshed with the second output shaft end gear, and the second motor is connected with the second gear through a second planetary gear train. Power output lines of the double motors are independent, and related structures of a differential mechanism are not needed; the driving system is high in structural integration degree, compact in structure, beneficial to arrangement, small in unsprung mass and suitable for four-wheel-drive and two-wheel-drive vehicle types.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile new energy transmission, in particular to a dual-motor electric drive system. Background Art

[0002] New energy vehicles are driven by motors, and the motor speed and torque are adjusted through the transmission gear structure to make the motor work in the best power performance state. The existing transmission structure of new energy vehicles is complex, occupies a large space, and is not conducive to space layout.

[0003] In the prior art, the power output of the dual-motor drive system will eventually reach the same, and the drive system assembly has a differential structure, which is complex and occupies a large space; for example, Chinese patent CN109835157A discloses an electric drive axle with a dual-motor dual planetary gear differential, wherein the first motor and the second motor are coaxially mounted, and the first planetary gear is coaxially mounted with the second planetary gear; the first motor shaft is connected to the first motor shaft gear, the first motor shaft gear is externally meshed with the left input gear, and the left input gear is connected to the first inner gear ring; the left output gear is connected to the swing arm of the first planetary gear, and the left output gear is connected to the left half shaft. The second motor shaft is connected to the second motor shaft gear, and the second motor shaft gear is externally meshed with the first right input gear and the second right input gear respectively; the first right input gear is connected to the first sun gear; the second right input gear is connected to the second inner gear ring; the right output gear is connected to the second swing arm of the second planetary gear, and the right output gear is connected to the right half shaft. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a dual-motor electric drive system to achieve the purpose of high integration and compact structure.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] The dual-motor electric drive system includes a reducer housing, a first motor, a second motor, a first output shaft and a second output shaft, the first output shaft is provided with a first output shaft end gear, the second output shaft is provided with a second output shaft end gear, and also includes a first planetary gear train, a first gear, a second planetary gear train and a second gear; the first planetary gear train and the second planetary gear train are both installed on the reducer housing, the first gear is meshed with the first output shaft end gear, the first motor is connected to the first gear through the first planetary gear train, the second gear is meshed with the second output shaft end gear, and the second motor is connected to the second gear through the second planetary gear train.

[0007] Further:

[0008] The rotor of the first motor is connected to the sun gear of the first planetary gear train, the inner gear ring of the first planetary gear train is fixed on the reducer housing, and the first gear is connected to the planet carrier of the first planetary gear train through a spline.

[0009] The rotor of the second motor is connected to the sun gear of the second planetary gear train, the inner gear ring of the second planetary gear train is fixed on the reducer housing, and the second gear is connected to the planet carrier of the second planetary gear train through a spline.

[0010] The first motor and the second motor are arranged in parallel and in a central oblique symmetric manner.

[0011] The first output shaft is parallel to and concentric with the second output shaft.

[0012] The first planetary gear train and the second planetary gear train are centrally arranged obliquely symmetrically.

[0013] The first output shaft end gear and the second output shaft end gear have the same size specifications.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The dual-motor electric drive system has a reasonable structural design and adopts independent power output routes of the dual motors, without the need for differential-related structures. The drive system has a high degree of structural integration, a compact structure, is easy to arrange, has low unsprung mass, and is suitable for four-wheel drive and two-wheel drive models. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following is a brief description of the contents and symbols in the drawings of this specification:

[0017] Figure 1 This is a schematic diagram of the system structure of the utility model.

[0018] In the figure:

[0019] 1. First motor; 2. First planetary gear train sun gear; 3. First planetary gear train inner ring gear; 4. First planet carrier with planetary gear assembly; 5. First gear; 6. First output shaft end gear; 7. First output shaft;

[0020] 8. The second motor; 9. The sun gear of the second planetary gear train; 10. The inner ring gear of the second planetary gear train; 11. The second planetary carrier with the planetary gear assembly; 12. The second gear; 13. The second output shaft end gear; 14. The second output shaft. DETAILED DESCRIPTION

[0021] The specific implementation of the utility model will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0022] like Figure 1As shown, the symmetrical dual-motor electric drive system includes a reducer housing, a first motor 1, a second motor 8, a first output shaft 7, a second output shaft 14, a first planetary gear train, a first gear 5, a second planetary gear train and a second gear 12.

[0023] The first output shaft is parallel to the second output shaft and is arranged concentrically; the first output shaft is provided with a first output shaft end gear, the second output shaft is provided with a second output shaft end gear, the first planetary gear train and the second planetary gear train are both installed on the reducer housing, the first gear is meshed with the first output shaft end gear, the first motor is connected to the first gear through the first planetary gear train, the second gear is meshed with the second output shaft end gear, and the second motor is connected to the second gear through the second planetary gear train.

[0024] The first planetary gear train and the second planetary gear train are arranged obliquely symmetrically from the center. The rotor of the first motor is connected to the sun gear of the first planetary gear train, the inner gear ring of the first planetary gear train is fixed on the reducer housing, and the first gear is connected to the planet carrier of the first planetary gear train through a spline; the rotor of the second motor is connected to the sun gear of the second planetary gear train, the inner gear ring of the second planetary gear train is fixed on the reducer housing, and the second gear is connected to the planet carrier of the second planetary gear train through a spline.

[0025] The first motor and the second motor are arranged in parallel and obliquely symmetrically. The first output shaft end gear and the second output shaft end gear have the same size specifications. The power output route of the dual motors is independent, and no differential related structure is required; the drive system has a high degree of structural integration, a compact structure, is easy to arrange, has a small unsprung mass, and is suitable for four-wheel drive and two-wheel drive models.

[0026] Preferred specific embodiments are:

[0027] The sun gear 2 of the first planetary gear system is connected to the rotor of the first motor 1, the inner gear ring 3 of the first planetary gear system is fixed on the reducer housing, the first gear is connected to the first planetary carrier with the planetary gear assembly 4 through a spline, the first gear 5 is meshed with the first output shaft end gear 6 for transmission, and the first output shaft end gear is splined with the first output shaft 7. The sun gear 9 of the second planetary gear system is connected to the rotor of the second motor 8, the inner gear ring 10 of the second planetary gear system is fixed on the reducer housing, the second gear 12 is connected to the second planetary carrier with the planetary gear assembly 11 through a spline, the second gear 12 is meshed with the second output shaft end gear 13 for transmission, and the second output shaft end gear is splined with the second output shaft 14. The first motor and the second motor are arranged in parallel, and the first output shaft and the second output shaft are arranged in parallel and concentrically. The motor shaft is connected to the planetary system with a bearing to reduce the vibration and noise of the motor shaft and improve the NVH performance of the entire electric drive system.

[0028] The symmetrical dual-motor drive system has a compact structure, small size and is easy to arrange. The solution can be used for four-wheel drive and two-wheel drive models. In two-wheel drive models, the two motors output power to the two drive wheels respectively, without the need for a differential. The parameters of the two motors are exactly the same. When the vehicle is traveling in a straight line, the speeds of the first motor and the second motor are exactly the same. When the vehicle is traveling on a curve, the speed difference between the two motors is controlled to achieve the differential of the drive wheels on both sides. In four-wheel drive models, the power of the first motor and the second motor is output to the front axle and the rear axle respectively. The torque ratio of the front and rear axles can be distributed by adjusting the parameters and power output of the two motors, and the differential can be achieved by controlling the speed of the first motor and the second motor, without the need for a central differential.

[0029] The above is only an explanation of the preferred embodiments of the present invention. The above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0030] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A dual-motor electric drive system, comprising a reducer housing, a first motor, a second motor, a first output shaft and a second output shaft, wherein the first output shaft is provided with a first output shaft end gear, and the second output shaft is provided with a second output shaft end gear, characterized in that: It also includes a first planetary gear train, a first gear, a second planetary gear train and a second gear; the first planetary gear train and the second planetary gear train are both installed on the reducer housing, the first gear is meshed with the first output shaft end gear, the first motor is connected to the first gear through the first planetary gear train, the second gear is meshed with the second output shaft end gear, and the second motor is connected to the second gear through the second planetary gear train.

2. The dual-motor electric drive system according to claim 1, characterized in that: The rotor of the first motor is connected to the sun gear of the first planetary gear train, the inner gear ring of the first planetary gear train is fixed on the reducer housing, and the first gear is connected to the planet carrier of the first planetary gear train through a spline.

3. The dual-motor electric drive system according to claim 1, characterized in that: The rotor of the second motor is connected to the sun gear of the second planetary gear train, the inner gear ring of the second planetary gear train is fixed on the reducer housing, and the second gear is connected to the planet carrier of the second planetary gear train through a spline.

4. The dual-motor electric drive system according to claim 1, characterized in that: The first motor and the second motor are arranged in parallel and in a central oblique symmetric manner.

5. The dual-motor electric drive system according to claim 1 or 4, characterized in that: The first output shaft is parallel to and concentric with the second output shaft.

6. The dual-motor electric drive system according to claim 5, characterized in that: The first planetary gear train and the second planetary gear train are centrally arranged obliquely symmetrically.

7. The dual-motor electric drive system according to claim 6, characterized in that: The first output shaft end gear and the second output shaft end gear have the same size specifications.

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