CN114435124A - A dual-motor multi-mode drive system based on planetary gears - Google Patents

Abstract

The invention relates to a dual-motor multi-mode drive system based on planetary gears, comprising a drive motor I, an input shaft I, a drive motor II, an output shaft II, a double-row single-sun gear planetary gear mechanism, a brake I, a brake II, a gear train The casing and the transmission mechanism; the drive motor I is connected to the sun gear of the double-row single-sun gear planetary gear mechanism by the input shaft I; the drive motor II is connected to the gear of the double-row single-sun gear planetary gear mechanism by the input shaft II The operation of the brake I can brake the large planet carrier of the double-row single-sun gear planetary gear mechanism, and the brake II operation can brake the ring gear of the double-row single-sun gear planetary gear mechanism; the double-row single-sun gear mechanism The asteroid carrier of the planetary gear mechanism is connected with the transmission mechanism as the output member of the mechanism, and the output power drives the car. The system can realize five driving modes, so that the car has a variety of driving modes to choose from during the driving process to meet different driving needs.

Description

A dual-motor multi-mode drive system based on planetary gears

technical field

The invention relates to the technical field of new energy vehicles, in particular to a dual-motor multi-mode drive system based on planetary gears.

Background technique

The automobile industry has achieved rapid development in recent years, bringing great convenience to people's lives. As people's demand for vehicle power, economy and comfort is gradually increasing, the oil resources are increasingly scarce and the natural environment is getting worse, the country has begun to vigorously support the research and development and use of electric vehicles. Electric vehicles are clean, environmentally friendly and comfortable to drive, and are a good solution to the problem of listing. However, electric vehicles still have problems such as limited battery capacity and short battery life.

The dual-motor drive has a variety of working modes through the cooperation of the two drive motors and the brakes. Different drive modes can be selected under different road conditions, and the optimal working mode can be selected. economical, thereby improving energy efficiency. Therefore, the dual-motor drive system will become a key research and development direction in the field of new energy vehicles.

SUMMARY OF THE INVENTION

In view of the above problems, the purpose of the present invention is to provide a planetary gear set coupling drive system equipped with dual motors, which aims to improve the use efficiency of power through various working modes under the premise of ensuring the power of the car, so as to improve the economy of the car . The invention improves the single-motor drive system into a double-motor structure, is matched with a planetary gear mechanism, and cooperates with a brake to provide multiple drive modes.

The technical scheme adopted in the present invention is as follows:

A dual-motor multi-mode drive system based on planetary gears proposed by the present invention includes a drive motor I, an input shaft I, a drive motor II, an input shaft II, a double-row single sun gear planetary gear mechanism, a brake I, a brake II and transmission mechanism;

The double row single sun gear planetary gear mechanism includes a large sun gear, a ring gear, an inner planetary gear, a large planet carrier, a small sun gear, an outer planet gear and a small planet carrier; the large sun gear and the small sun gear are arranged in parallel in sequence ; the inner planetary gear is meshed and connected to the outer circumference of the large sun gear; the large planet carrier is arranged on one side of the inner planet gear; the outer planet gear is meshed and connected to the outer circumference of the small sun gear; the small planet carrier is arranged on one side of the outer planetary gear; the ring gear is arranged on the outer side of the inner planetary gear and the outer planetary gear and is meshed with the inner planetary gear and the outer planetary gear respectively;

The drive motor I is connected with the ring gear through the input shaft I; the drive motor II is connected with the large planet carrier, the large sun gear and the small sun gear through the input shaft II accordingly; one side of the brake I is connected with the large planet carrier. , used for the braking of the large planetary carrier; one side of the brake II is connected with the ring gear for braking of the ring gear; the transmission mechanism is arranged at the output end of the small planetary carrier; the drive motor I and the drive motor The torque of II is output to the power transmission mechanism through the asteroid carrier.

Further, the power transmission mechanism includes an input gear of the main reducer, an output gear of the main reducer and a differential; the input gear of the main reducer is engaged with the output end of the small planet carrier; the output gear of the main reducer is connected with the main reducer. The transmission input gears engage, transmitting power to the differential and ultimately to the wheels to drive the vehicle.

Further, the large sun gear and the small sun gear are coaxially connected to the input shaft II, that is, share the same input shaft, and the rotation axes coincide on a straight line.

Further, a gear train housing is provided outside the double-row single sun gear planetary gear mechanism, and the brake I, the brake II, the input gear of the final reducer and the output gear of the final reducer are all located inside the gear train casing.

Further, the drive system includes five drive modes, namely, drive motor I drive mode, drive motor II drive mode I, drive motor II drive mode II, dual motor torque coupling mode and dual motor rotational speed coupling mode; wherein

Drive motor I drive mode: drive motor I works to provide torque for the drive system, brake I brakes the large planet carrier, and both drive motor II and brake II do not work;

Drive motor II drive mode 1: drive motor II works to provide torque for the drive system, brake I brakes the large planet carrier, and both drive motor I and brake II do not work;

Drive motor II drive mode 2: drive motor II works to provide torque for the drive system, brake II brakes the ring gear, and both drive motor I and brake I do not work;

Dual motor torque coupling mode: drive motor I and drive motor II work at the same time to provide torque for the drive system together, brake I brakes the large planet carrier, and brake II does not work;

Dual-motor speed coupling mode: Drive motor I and II work at the same time to provide torque to the drive system, and both brake I and brake II do not work.

Compared with the prior art, the present invention has the following beneficial effects:

The performance of pure electric vehicles at medium and low speeds is very good, quiet, economical and high-performance, but at high speeds, the cost performance of pure electric vehicles will become very low, and the increase in resistance will increase the power consumption speed of pure electric vehicles. The invention can rely on the cooperation of two motors and two brakes to provide a wider transmission ratio for the driving of the car, because the transmission ratio has more choices, the vehicle can switch modes under different driving conditions, and choose the most The most suitable and most efficient mode is used to drive, so that higher transmission efficiency and energy utilization can be achieved.

Description of drawings

1 is a schematic structural diagram of a planetary gear-based dual-motor multi-mode drive system proposed by the present invention;

Fig. 2 is the power transmission diagram of the drive motor I drive mode of the present invention;

Fig. 3 is the power transmission diagram of the driving motor II driving mode 1 of the present invention;

Fig. 4 is the power transmission diagram of the second driving mode of the driving motor II of the present invention;

FIG. 5 is a power transmission diagram of the dual-motor drive mode of the present invention.

Wherein, reference numerals: 1-drive motor II; 2-input shaft II; 3-drive motor I; 4-input shaft I; 5-ring gear; 6-inner planetary gear; 7-outer planetary gear; 8-small Planet carrier; 9-main reducer input gear; 10-differential; 11-main reducer output gear; 12-large sun gear; 13-brake II; 14-large planetary carrier; 15-brake I; 16-small Sun gear; 17-Gear train housing.

Detailed ways

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

It should be noted that in the description of the present invention, the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc. The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not mean that a device or element must have a specific orientation, be constructed and operated in a specific orientation.

Referring to Figures 1 to 4, the specific structure of an embodiment of a planetary gear-based dual-motor multi-mode drive system proposed by the present invention is given. The drive system includes a drive motor II1, an input shaft II2, a drive motor I3, an input shaft I4, a double row single sun gear planetary gear mechanism, a brake II13, a brake I15 and a transmission mechanism.

Wherein, the double-row single-sun gear planetary gear mechanism includes a ring gear 5, an inner planetary gear 6, an outer planetary gear 7, a small planetary carrier 8, a large sun gear 12, a large planetary carrier 14 and a small sun gear 16; The sun gear and the small sun gear are arranged in parallel in turn; the inner planetary gear 6 is meshed and connected to the outer circumference of the large sun gear 12; the large planet carrier 14 is connected to the left side of the inner planetary gear 6; the outer planetary gear 7 is meshed Connected to the outside of the circumference of the small sun gear 16; the small planet carrier 8 is connected to the right side of the outer planetary gear 7; It is meshed with the outer planetary gear 7 .

The drive motor II1 is coaxially connected to the large planet carrier 14, the large sun gear 12 and the small sun gear 16 in turn through the input shaft II2, that is, the large planet carrier 14, the large sun gear 12 and the small sun gear 16 share the same input shaft and rotate. The axes coincide on a straight line; the drive motor I3 is coaxially connected to the ring gear 5 through the input shaft I4; the double row single sun gear planetary gear mechanism is provided with a gear train housing 17 outside; the brake I15 is located in the gear train Inside the housing 17, one side is connected with the gear train housing 17, and the other side is connected with the large planet carrier 14 for braking the large planet carrier 14; the brake II is located inside the gear train housing 17, and one side is connected to the large planet carrier 14. The gear train housing 17 is connected, and the other side is connected to the ring gear 5 for braking of the ring gear 5; the transmission mechanism is connected to the output end of the asteroid carrier 8; the torque of the drive motor I3 and the drive motor II1 It is output to the power transmission mechanism through the asteroid carrier 8 .

The power transmission mechanism includes a main reducer input gear 9, a main reducer output gear 11 and a differential 10; the main reducer input gear 9 is connected with the output end of the small planet carrier 8; the main reducer output gear 11 meshes with the main reducer input gear 9; and the main reducer input gear 9 and the main reducer output gear 11 are both located inside the gear train housing 17; the differential 10 is connected with the main reducer output gear 11, The power is transmitted to the differential 10, which is then input to the axle shafts, and finally to the wheels to drive the vehicle. Through the vehicle controller, the driving mode of the vehicle is decided and switched according to the driving demand of the vehicle.

The drive system includes five drive modes, namely drive motor I drive mode, drive motor II drive mode I, drive motor II drive mode II, dual motor torque coupling mode and dual motor rotational speed coupling mode; wherein

When the system is in the drive mode of the drive motor I3, as shown in Figure 2, when in this drive mode, the drive motor I3 and the brake I15 work, the drive motor I3 provides driving force, and the brake I15 moves the large planet carrier 14. At this time, the power is input from the drive motor I3 to the ring gear 5 through the input shaft I4. After passing through the planetary gear mechanism, the small planet carrier 8 outputs the power to the input gear 9 of the main reducer, and the output gear 11 of the main reducer finally outputs the power. . At the same time, the driving force can be input to the driving motor II1 to make it reverse.

When the system is in drive motor II1 drive mode one, as shown in Figure 3. When in this drive mode, the drive motor II1 and the brake I15 work, and the brake II13 does not work. The drive motor II1 provides the driving force, and the brake I15 moves the large planetary carrier 14. At this time, the power is input from the drive motor II1 to the sun gear 12 through the input shaft II2. After passing through the planetary gear mechanism, the small planet carrier 8 outputs the power to the input gear 9 of the main reducer, and the output gear 11 of the main reducer finally outputs the power. . At the same time, the driving force can be input to the driving motor I3 to make it reverse.

When the system is in the second drive mode of the drive motor II, as shown in Figure 4. When in this mode, the drive motor II1 and the brake II13 work, and the brake I15 does not work. The drive motor II1 provides driving force, and the brake II13 moves the ring gear 5. At this time, the power is input from the drive motor II1 to the large sun gear 12 and the small sun gear 16 through the input shaft II2. After passing through the planetary gear mechanism, the small planet carrier 8 outputs the power to the input gear 9 of the main reducer, and is output by the main reducer. Gear 11 will eventually take the power out. Since the brake II brakes the ring gear 5, the drive motor I3 will not reverse rotation at this time.

When the system is in dual-motor torque coupling mode, as shown in Figure 5, when in this drive mode, both drive motor I3 and drive motor II1 work, brake I15 works, and brake II13 does not work. The drive motor I3 and the dynamic motor II1 provide driving force, and the brake I15 drives the large planetary carrier 14 . At this time, the power is input from the drive motor II1 to the sun gear 12 through the input shaft I4 and the input shaft II2. After passing through the planetary gear mechanism, the small planet carrier 8 outputs the power to the input gear 9 of the main reducer, and the output gear 11 of the main reducer outputs the power. Eventually the power will be taken out.

When the system is in the dual-motor speed coupling mode, both the drive motor I3 and the drive motor II1 work, the brake I15 does not work, and the brake II13 does not work. The two modes only depend on whether the brake I15 works or not, and the rest are exactly the same.

The invention adopts a dual-motor drive planetary gear mechanism to ensure the power of the vehicle as a premise. Through the cooperation of the drive motor and the brake, it can be switched between multiple modes to adapt to different driving needs and improve the utilization rate of energy.

The working states of the components corresponding to the above different working modes are shown in Table 1:

Mode EM1 EM2 Break1 Break2 1 on off on off 2 off on on off 3 off on off on 4 on on on off 5 on on off off

The above-mentioned embodiments are only to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. On the premise of not departing from the design spirit of the present invention, those of ordinary skill in the art can Such deformations and improvements shall fall within the protection scope determined by the claims of the present invention.

Claims (5)

1. A dual-motor multi-mode driving system based on a planetary gear is characterized in that: the driving system comprises a driving motor I, an input shaft I, a driving motor II, an input shaft II, a double-row single-sun-wheel planetary gear mechanism, a brake I, a brake II and a transmission mechanism;

the double-row single-sun-wheel planetary gear mechanism comprises a large sun wheel, a gear ring, an inner planetary gear, a large planet carrier, a small sun wheel, an outer planetary gear and a small planet carrier; the large sun wheel and the small sun wheel are sequentially arranged in parallel; the inner planetary gear is meshed and connected with the outer side of the circumference of the large sun gear; the large planet carrier is arranged on one side of the inner planet gear; the outer planetary gear is meshed and connected with the outer side of the circumference of the small sun gear; the small planet carrier is arranged on one side of the outer planet gear; the gear ring is arranged on the outer sides of the inner planetary gear and the outer planetary gear and is respectively meshed with the inner planetary gear and the outer planetary gear;

the driving motor I is connected with the gear ring through the input shaft I; the driving motor II is sequentially connected with the large planet carrier, the large sun gear and the small sun gear through the input shaft II; one side of the brake I is connected with the large planet carrier and used for braking the large planet carrier; one side of the brake II is connected with the gear ring and used for braking the gear ring; the transmission mechanism is arranged at the output end of the small planet carrier; and the torques of the driving motor I and the driving motor II are output to the power transmission mechanism through the small planet carrier.

2. A planetary gear based dual motor multi-mode drive system as claimed in claim 1, wherein: the power transmission mechanism comprises a main speed reducer input gear, a main speed reducer output gear and a differential mechanism; the input gear of the main speed reducer is meshed with the output end of the small planet carrier; and the output gear of the main reducer is meshed with the input gear of the main reducer, the power is transmitted to the differential mechanism, and finally the power is transmitted to the wheels to drive the automobile to run.

3. A planetary gear based dual motor multi-mode drive system as claimed in claim 1, wherein: the big sun gear and the small sun gear are coaxially connected with the input shaft II, namely, the big sun gear and the small sun gear share the same input shaft, and the rotating axes are superposed on the same straight line.

4. A planetary gear based dual motor multi-mode drive system as claimed in claim 2, wherein: the outside of double single sun gear planetary gear mechanism is provided with the train casing, stopper I, stopper II, final drive input gear and final drive output gear all are located inside the train casing.

5. A planetary gear based dual motor multi-mode drive system as claimed in claim 1, wherein: the driving system comprises five driving modes, namely a driving motor I driving mode, a driving motor II driving mode I, a driving motor II driving mode II, a double-motor torque coupling mode and a double-motor rotating speed coupling mode; wherein

Drive motor I drive mode: the driving motor I works to provide torque for a driving system, the brake I brakes the large planet carrier, and the driving motor II and the brake II do not work;

the driving mode I of the driving motor II is as follows: the driving motor II works to provide torque for a driving system, the brake I brakes the large planet carrier, and the driving motor I and the brake II do not work;

and driving a second driving mode of the driving motor II: the driving motor II works to provide torque for a driving system, the brake II brakes the gear ring, and the driving motor I and the brake I do not work;

dual motor torque coupling mode: the driving motor I and the driving motor II work simultaneously to provide torque for a driving system together, the brake I brakes the large planet carrier, and the brake II does not work;

double-motor rotating speed coupling mode: the driving motors I and II work simultaneously to provide torque for a driving system, and the brake I and the brake II do not work.

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