CN115195460A - Electric drive system and vehicle - Google Patents

Abstract

The application provides an electric drive system and a vehicle. The electric drive system comprises a drive motor assembly, a differential, an electric drive reducer and a motor controller. The driving motor assembly is used for outputting single power. The differential is connected with the driving motor assembly and is arranged to divide the single power into a first power and a second power which are independent of each other. The electrically driven speed reducer is connected with the differential and is arranged to reduce the speed and increase the torque of the first power and the second power respectively so as to provide two independent output powers. The motor controller is connected with the driving motor assembly and used for controlling the driving motor assembly. In this way, traditional electric drive system has been solved because of power take off point biasing to this application, leads to the transmission shaft to cross whole electric drive system and causes the extravagant problem in space, and the power supply of first power and second power can arrange in a flexible way in order to match the in service behavior of whole car, really realizes variable framework.

Description

Electric drive system and vehicle

technical field

The present application relates to the field of vehicle driving, and in particular, to an electric drive system and a vehicle having the electric drive system.

Background technique

At present, the development of new energy vehicles is relatively rapid. Compared with the internal combustion engines used in traditional vehicles, the electric motors used in new energy vehicles should have higher requirements. At present, the mainstream electric drive system on the market is a three-in-one electric drive system, which includes three parts: a drive motor, a motor controller and an electric drive reducer. In view of the structure of the traditional parallel shaft reducer, most three-in-one electric drive systems are piggybacked structures.

However, under the existing technical conditions, the power output points in the three-in-one electric drive system are offset, which leads to a certain transmission shaft needing to traverse the entire electric drive system, thereby causing a waste of space.

SUMMARY OF THE INVENTION

The present application provides an electric drive system, which solves the problem of wasting space caused by the need for the transmission shaft to traverse the entire electric drive system due to the offset of the power output point of the traditional three-in-one electric drive system.

To solve the above technical problems, an electric drive system proposed in the present application includes a drive motor assembly, a differential, an electric drive reducer and a motor controller. The drive motor assembly is used to output single power. A differential is connected to the drive motor assembly and configured to divide the single power into mutually independent first power and second power. The electric drive reducer is connected to the differential, and is configured to decelerate and increase the torque of the first power and the second power respectively, so as to provide two independent output powers. A motor controller is connected to the drive motor assembly for controlling the drive motor assembly.

Specifically, the electric drive system further includes a housing structure, and the drive motor assembly, the differential, the electric drive reducer and the motor controller are all mounted on the housing structure.

Specifically, the electric drive system further includes an oil cooling module, and the oil cooling module is connected to the drive motor assembly.

Specifically, there are two electric drive speed reducers, which are connected to the left and right sides of the drive motor assembly.

Specifically, the motor controller is arranged in the middle area formed by the drive motor assembly and the left and right electric drive speed reducers.

Specifically, each of the electric drive reducers is provided with a spline, and the spline is the power output end of the electric drive system.

Specifically, the electric drive reducer includes an output half shaft, and the output half shaft is engaged with the spline for transmitting the output power to the tire.

Specifically, the electric drive reducer further includes a half shaft oil seal, the half shaft oil seal is arranged on the output half shaft, and oil seals the output half shaft.

Specifically, the drive motor assembly is connected to the differential at one end, the differential is connected to one of the electric drive reducers through a first input shaft, and the differential is connected through a second input shaft the other of the electric drive reducers.

Specifically, the first input shaft extends toward the other end of the drive motor assembly in the motor shaft of the drive motor assembly and protrudes out of the motor shaft, so as to communicate with one of the electric drive speed reducers. Mesh connection.

Specifically, the electric drive system further includes a suspension structure, the suspension structure has four connecting parts for connecting and installing with the vehicle frame, and the center of mass of the electric drive system is located at the center of the four connecting parts at or near.

Another technical solution proposed by the present application is to provide a vehicle, the vehicle includes a frame and an electric drive system connected to the frame, the electric drive system is the electric drive according to any one of the above system.

The beneficial effects of the present application are: compared with the existing electric drive system, the electric drive system proposed by the present application uses a differential to connect with the drive motor assembly, and is arranged to divide the single power output by the drive motor assembly into mutual The first power and the second power are independent, and the electric drive reducer connected with the differential is used, and the first power and the second power are respectively decelerated and twisted, so as to provide two independent output powers; , the mutually independent first power and the second power are easily distributed on both sides of the electric drive system, without the need for the transmission shaft to traverse the entire electric drive system, which is conducive to the full utilization of space. Moreover, the independent power sources of the first power and the second power can be flexibly arranged to match the usage conditions of the whole vehicle, thus truly realizing a variable architecture. In addition, the differential in the present application can use a small differential, which makes it smaller, lighter and less expensive.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained from these drawings without creative efforts, wherein:

1 is a schematic three-dimensional structural diagram of an embodiment of an electric drive system provided by the present application;

Fig. 2 is a sectional view of the embodiment of Fig. 1;

Figure 3 is a cross-sectional view of the drive motor assembly in Figure 1;

Fig. 4 is the sectional view of the electric drive reducer in Fig. 1;

Figure 5 is a cross-sectional view of the differential in Figure 1;

6 is a schematic diagram of another embodiment of an electric drive system provided by the present application;

7 is a schematic diagram of another viewing angle in the embodiment of FIG. 6;

FIG. 8 is a schematic diagram of the arrangement structure of the electric drive system according to other embodiments provided in the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. According to the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, Or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application in specific situations.

Please refer to FIG. 1 and FIG. 2 , FIG. 1 is a schematic three-dimensional structural diagram of an embodiment of an electric drive system provided by the present application, and FIG. 2 is a cross-sectional view of the embodiment of FIG. 1 . In one aspect of the present application, an electric drive system is provided. In one embodiment, the electric drive system includes a drive motor assembly 100 , a differential 200 , an electric drive reducer 300 and a motor controller 400 . The drive motor assembly 100 is used to output a single power; that is, the drive motor assembly 100 of the present application outputs power as a single power source. The differential 200 is connected to the drive motor assembly 100 and is configured to divide the single power output by the drive motor assembly 100 into a first power and a second power that are independent of each other. The electric drive reducer 300 is connected to the differential 200 and is configured to decelerate the first power and the second power and increase the torque respectively, so as to provide two independent output powers. The motor controller 400 is connected to the drive motor assembly 100 for controlling the drive motor assembly 100, so that the output of the motor assembly 100 can be controlled according to requirements.

In the electric drive system of this embodiment, the differential gear 200 is connected to the drive motor assembly 100, and is set to divide the single power output by the drive motor assembly 100 into mutually independent first power and second power, The electric drive reducer 300 connected to the differential 200 is then used, and is arranged to decelerate and increase the torque of the first power and the second power, respectively, so as to provide two independent output powers; thus, this mutually independent first power The power and the second power are easily distributed on both sides of the electric drive system, and there is no need to make the transmission shaft traverse the entire electric drive system as in the prior art, which is beneficial to the full utilization of space; for example, the motor controller 400 can be arranged in the In the space in the middle part of the electric drive system. Moreover, the independent power sources of the first power and the second power can be flexibly arranged to match the usage conditions of the entire vehicle, thus truly realizing a variable architecture. In addition, the differential in the present application can employ a small differential, which makes it smaller, lighter, and less expensive.

It is pointed out here that the electric drive system of the present application may also be referred to as a single power source distributed drive electric drive system.

1 and 2 , in some embodiments, the electric drive system further includes a housing structure, and the drive motor assembly 100 , the differential 200 , the electric drive reducer 300 and the motor controller 400 are all mounted on the housing structure . Wherein, some or all of the drive motor assembly 100 , the differential 200 , the electric drive reducer 300 and the motor controller 400 may adopt a common casing, or some casings may be connected to other casings by bolts superior. In this way, the electric drive system of the embodiment of the present application can be integrated into a whole, so as to facilitate later installation.

In some embodiments, the electric drive system further includes an oil cooling module 500. The oil cooling module 500 is connected to the drive motor assembly 100, and the connection can be performed by bolts or a common housing. The oil cooling module 500 includes components such as an oil pump, an oil filter, and a heat exchanger, and functions to provide lubrication, cooling and heat dissipation for the entire electric drive system by absorbing the heat of the lubricating oil and exchanging heat with the ambient air or radiator coolant.

In some embodiments, there are two electric drive decelerators 300 , which are connected to the left and right sides of the drive motor assembly 100 . The drive motor assembly 100 outputs power as a single power source, and is connected to the electric drive reducer 300 through bolts or a common housing, so as to reduce the speed of the motor and increase the torque at the same time. According to the characteristic curve of the motor, under the condition that the output power of the motor is fixed, the torque is inversely proportional to the rotational speed, that is, the faster the rotational speed, the smaller the torque, and vice versa, the torque increases when the rotational speed decreases. There are two left and right electric drive decelerators 300, and the two electric drive decelerators 300 independently perform power output.

In some embodiments, the motor controller 400 is disposed in the middle area formed by the drive motor assembly 100 and the left and right electric drive decelerators 300 to control the motor output according to requirements. Likewise, the motor controller 400 is connected to the drive motor assembly 100 via bolts or a common housing. The motor controller is one of the key components of an electric vehicle. Its function is to convert the electrical energy stored in the power battery into the electrical energy required to drive the motor according to the gear, accelerator, brake and other commands to control the start-up, operation and operation of the electric vehicle. Driving states such as advancing and retreating speed, climbing strength, etc., may help the electric vehicle to brake, and store part of the braking energy in the power battery.

In some embodiments, the electric drive reducer 300 is provided with a spline 341 , and the spline 341 is the power output end of the electric drive system. Similarly, the splines 341 are arranged on the left and right sides to transmit the output power after being output to the electric drive reducer 300 for deceleration and torque increase to the wheel drive system.

Please refer to FIG. 3 , which is a cross-sectional view of the driving motor assembly of FIG. 1 . In some embodiments, the drive motor assembly 100 further includes a motor stator assembly 130 , a motor rotor assembly 140 and a motor shaft 150 , as well as a motor front casing 110 and a motor rear casing 120 . Wherein, the motor front casing 110 and the motor rear casing 120 are connected by bolts.

Please refer to FIG. 3 and FIG. 5 in combination. FIG. 5 is a cross-sectional view of the differential in FIG. 1 . In some embodiments, the drive motor assembly 100 is connected at one end to the differential 200 , the differential 200 is connected to one of the electric drive reducers 300 through the first input shaft 390 , and the differential 200 is connected through the second input shaft 310 The other of the electric drive reducers 300.

It can be understood that, due to the existence of the differential 200, the separate power source is divided into a first power source and a second power source, and their power sources are the same. Therefore, the source of the power input by the first input shaft 390 and the second input shaft 310 Similarly, the positions of the left and right electric drive reducers 300 and the drive motor assembly 100 are structurally on the same line, and the axes of the first input shaft 390 , the second input shaft 310 and the motor shaft 150 are also on the same straight line At this time, the first input shaft 390 , the second input shaft 310 and the motor shaft 150 can be set as one shaft, so as to reduce the loss of the input power through the connection structure.

In some embodiments, please refer to FIG. 3 , FIG. 4 and FIG. 5 in combination. FIG. 4 is a cross-sectional view of the electric drive reducer in FIG. 1 . The reducer front casing 350 and the reducer rear casing 360 are fixedly connected by bolts. The first input shaft 390 extends toward the other end of the drive motor assembly 100 within the motor shaft 150 of the drive motor assembly 100 and extends out of the motor shaft 150 to be engaged with one of the electric drive decelerators 300 . The motor stator assembly 130 is similar to the conventional motor stator, and is composed of silicon steel punching sheets and copper wire windings, and is fixedly connected with the inner hole of the motor front shell 110 through interference fit. Similarly, the motor rotor assembly 140 is composed of silicon steel punching sheets and permanent magnets, and is fixedly connected to the motor shaft 150 through interference fit. Rotor end plates 141 are press-fitted with interference fit at both ends for press-fitting the rotor assembly and performing dynamic balance and weight removal. Both ends of the motor shaft 150 are matched with the bearings 154 through an interference fit, so as to support the high-speed rotation of the motor shaft 150 and output power. The motor rotor assembly 140 transmits the power to the motor shaft 150 through interference or key fit, and then to the differential 200. The transmission splines 211 are transmitted to the second input shaft 310 and the first input shaft 390 .

In some embodiments, the differential 200 on the motor shaft 150 is a small differential assembly, and may further be a split differential assembly. The differential 200 may be assembled on one end of the motor shaft 150 using an integral differential. Since only the motor shaft 150 is equipped with a structure with a differential speed function or has a power output structure that undertakes both the motor rotor function and the differential speed function assembly, in another embodiment, the motor rotor assembly 140 can also be directly provided The object of the present application can also be achieved with the differential case.

Referring to FIG. 4 , in some embodiments, the electric drive reducer 300 further includes a gear member and a transmission shaft 320 , and the gear member includes a small gear member 330 and a large gear member 340 . The electric drive reducer 300 includes an output half shaft 370 that engages with the splines 341 for transmitting the output power to the tires. When the first input shaft 390 and the second input shaft 310 input power, the power is transmitted through the gear teeth meshing with the pinion member 330, and the pinion member 330 is fixedly connected with the transmission shaft 320 through interference fit to perform simultaneous movement, and the transmission shaft 320 transmits power through its gear teeth meshing with the large gear member 340, and finally meshes with the output half shaft 370 through the spline 341 to perform final power output, that is, the power is transmitted to the wheel transmission system.

In some further embodiments, the first input shaft 390 and the second input shaft 310 are provided with a first input bearing 311 and a second input bearing 312 , which are fitted with the first input shaft 390 and the second input shaft 310 through interference fit. Solid union, bear its rotation. Similarly, the transmission shaft 320 is provided with a first transmission bearing 321 and a second transmission bearing 322, which are fixedly connected with the transmission shaft 320 through interference fit to undertake its rotation; the large gear member 340 is provided with an output bearing 342, which is connected with the transmission shaft 340. The gear member 340 is fixedly connected with an interference fit and bears its rotation.

It can be understood that the electric drive reducer 300 decelerates and increases the torque of the input power through the meshing transmission between the gear parts, and the speed ratio and the degree of the deceleration and torque increase are changed by changing the number of gear teeth.

In some embodiments, the electric drive reducer 300 further includes a half shaft oil seal 343 . The half shaft oil seal 343 is disposed on the output half shaft 370 and oil seals the output half shaft 370 . The half shaft oil seal 343 is in contact with the output half shaft 370 to perform relative movement. It is used to protect the stability of the bearing and the oil in the electric drive reducer 300, and at the same time ensure the rotation of the output half shaft 370 and isolate external impurities from pollution.

Please refer to FIG. 6 , which is a schematic diagram of another embodiment of an electric drive system provided by the present application. In this embodiment, the electric drive system further includes a suspension structure 21, the suspension structure 21 has four connecting parts (points 11-14 in the figure) for connecting and installing with the frame, and the center of mass 17 of the electric drive system is located at four At or near the center of each connection (points 11-14 in the figure). It can be understood that when the center of mass 17 of the electric drive system is located at or near its center, due to the structural stability, the electric drive system is subjected to force and suspension force, and at the same time, when its center of mass 17 is located at or near the center, the two The output half shaft 370 on the side can also achieve the same effect with the minimum size of the same length, which saves more space and is more beneficial to the layout of the electric drive and the layout of the whole vehicle.

Referring again to FIG. 2 and FIG. 7 , FIG. 7 is a schematic diagram of another perspective in the embodiment of FIG. 6 . The drive motor assembly 100 and the left and right electric drive reducers 300 form an intermediate space area A1, which can be used to arrange the motor controller 400, the oil cooling module 500, etc., without affecting the external appearance of the entire electric drive system. envelope size. In addition, as shown in FIG. 7 , the left and right output axle shafts 370 can be of equal length, thereby facilitating the layout of the entire vehicle.

Please continue to refer to FIG. 8 . FIG. 8 is a schematic diagram of the arrangement structure of the electric drive system according to other embodiments provided by the present application. The differential 200 divides the single power source into the first power and the second power, which are respectively transmitted to the first input shaft 390 and the second input shaft 310 through the transmission splines 211 correspondingly arranged on the left and right sides, and through the first input The shaft 390 and the second input shaft 310 input the first power and the second power to the left and right electric drive reducers 300 for deceleration and torque increase, and finally the spline 341 outputs power to the output half shaft 370 . Since the power output positions of the left and right splines 341 are independent and do not affect each other, various structural arrangements of power output can be realized. The left and right output half shafts 370 can be arranged non-coaxially and staggered from each other. The triangular structure shown in Fig. 8-a, the coaxial structure shown in Fig. 8-b, and the linear structure shown in Fig. 8-c are all achievable layout structures of the electric drive system of the present application. However, it is not limited to the above four structural forms, and other similar deformed structures are also protected by this application.

Similarly, since the left and right output half shafts 370 can be flexibly set and adjusted to achieve distributed power output, the two electric drive reducers 300 in the present application are identical, and the two electric drive reducers 300 can also be differentiated according to different needs. design.

In another aspect of the present application, a vehicle is also provided. The vehicle includes a vehicle frame and the electric drive system of any one of the above embodiments connected to the vehicle frame. Therefore, the vehicle of the present application also has all the beneficial effects of the above electric drive system, which will not be repeated here.

In the description of this application, references to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc. refer to the specific features described in connection with the embodiment or example. , mechanism, material or feature is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, mechanisms, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

The above are only the embodiments of the present application, and are not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied in other related technical fields, All are similarly included in the scope of patent protection of the present application.

Claims (12)

1. An electric drive system, characterized in that the electric drive system comprises:

the driving motor assembly is used for outputting single power;

a differential connected with the driving motor assembly and configured to divide the single power into a first power and a second power which are independent of each other;

an electrically driven speed reducer connected to the differential and configured to reduce speed and increase torque of the first power and the second power, respectively, to provide two independent output powers; and

and the motor controller is connected with the driving motor assembly and is used for controlling the driving motor assembly.

2. The electric drive system of claim 1 further comprising a housing structure, the drive motor assembly, the differential, the electric drive reducer, and the motor controller all being mounted on the housing structure.

3. The electric drive system of claim 1 further comprising an oil cooling module coupled to the drive motor assembly.

4. The electric drive system of claim 1, wherein there are two electric drive retarders connected to the left and right sides of the drive motor assembly.

5. The electric drive system of claim 4, wherein the motor controller is disposed in an intermediate region between the drive motor assembly and the left and right electric drive retarders.

6. The electric drive system as defined in claim 4 wherein each of said electric drive reducers is provided with splines, said splines being the power take-off of said electric drive system.

7. The electric drive system of claim 6, wherein the electric drive reduction includes an output half shaft in meshing engagement with the splines for transmitting output power to the tire.

8. The electric drive system of claim 7, wherein the electric drive reducer further includes a half shaft oil seal disposed on and oil sealing the output half shaft.

9. The electric drive system of claim 4 wherein the drive motor assembly is coupled at one end to the differential, the differential being coupled to one of the electrically driven retarders via a first input shaft, the differential being coupled to the other of the electrically driven retarders via a second input shaft.

10. The electric drive system of claim 9 wherein the first input shaft extends within a motor shaft of the drive motor assembly toward the other end of the drive motor assembly and out of the motor shaft for meshing engagement with one of the electric drive retarders.

11. The electric drive system of any one of claims 1-10 further comprising a suspension structure having four attachment portions for attachment to a vehicle frame, the center of mass of the electric drive system being located at or near the center of the four attachment portions.

12. A vehicle, characterized in that the vehicle comprises a vehicle frame and an electric drive system connected to the vehicle frame, the electric drive system being an electric drive system according to any one of claims 1-11.

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