CN102673365A - Hybrid power electric automobile driving system by utilizing synchronous belt transmission - Google Patents

Abstract

The invention discloses a driving system of a hybrid electric vehicle using synchronous belt transmission. The driving system is composed of a front wheel engine driving system and two sets of independently controlled rear wheel electric driving systems; The synchronous belt, synchronous belt, and large pulley are transmitted to the half shaft and hub, and drive the rear wheel; there is no direct mechanical connection between the engine and the wheel motor, and they realize the conversion of the vehicle driving mode through the vehicle controller. The advantage of the present invention is that the distributed layout is more flexible than the centralized motor layout, saves space in the vehicle, and can realize multiple drive control modes such as all-wheel drive, front-wheel drive, and rear-wheel drive. The performance is better, it is beneficial to reduce the unsprung weight of the car, and the cost is low and the performance is high.

Description

Hybrid electric vehicle drive system using synchronous belt drive

technical field

The invention relates to a driving system of a hybrid electric vehicle, in particular to a driving system of a hybrid electric vehicle which is arranged in a distributed manner and adopts a synchronous belt to transmit power.

Background technique

Modern gasoline-electric hybrid electric vehicles are generally divided into three types: series, parallel and hybrid. Without exception, they all adopt a centralized motor drive scheme, that is, there is a high-power main drive motor and the power of the engine is coupled through the power coupling device and then transmitted to the wheels through the transmission shaft and the final reducer. In order to meet the performance requirements of the car, this kind of scheme generally adopts a higher power motor. At present, the power density of the motor is not high, so the power of the motor is large, the size and quality must be large, which will inevitably have a negative impact on the performance of the vehicle, and the layout of the motor in the car is not flexible, which is likely to affect the space in the car and affect the car. adverse effect on comfort.

The deceleration wheel-side electric drive system is a relatively new electric vehicle transmission scheme at present, that is, each drive motor is arranged near each drive wheel, and directly drives the wheels after passing through the deceleration mechanism. Since the wheel side motors can be arranged for each driving wheel, the wheel side motors can be selected from motors with less power. Moreover, the wheel-side electric drive system omits the clutches, universal joints, transmission shafts and differentials of traditional cars, so it has unique advantages compared with centralized motor drives: the vehicle has a simple structure and large available space; The chain is short, the transmission efficiency of the drive system is high, the torque of each drive wheel is independently controllable, and the dynamic control of the chassis system is more flexible and convenient. However, the current wheel-side electric drive system adopts multi-stage gear transmission due to the requirements of center distance and transmission ratio, which increases the unsprung mass of the vehicle, resulting in unsatisfactory vehicle performance, and due to the requirements of precise transmission of the bearing gear, it leads to sealing and lubrication. cost increase.

The synchronous belt is a new type of transmission belt, which is developed by combining the advantages of belt transmission, chain transmission and gear transmission. Because the transmission is carried out by meshing the toothed working surface with the pulley, there is no slippage between the belt and the pulley during the transmission process, and synchronous transmission is presented. Compared with the traditional V-belt, it has the advantages of light and thin belt body, high strength, accurate transmission ratio, high transmission efficiency, large transmission power range and high transmission speed. Compared with chain transmission, it has the advantages of good synchronization performance, no lubrication, light weight, low cost and convenient maintenance. Therefore, its development is very rapid, and it has replaced other types of belt drive or chain drive in some specific occasions, and has been widely used in light industrial machinery, chemical industry, computer and general machinery and other fields. However, the current application in automobiles is limited to the camshaft drive that controls the engine valves.

Contents of the invention

The technical problem to be solved by the present invention is to provide a hybrid electric vehicle drive system using a synchronous belt drive, which replaces the gear drive in the distributed wheel-side electric drive system with a synchronous belt drive.

In order to solve the above technical problems, the present invention provides a hybrid electric vehicle drive system using a synchronous belt drive, that is, the front wheels are powered by the engine, and each rear wheel is powered by a set of wheel-side electric drive systems. The specific transmission scheme is: it consists of a front-wheel engine drive system and two sets of independently controlled rear-wheel electric drive systems. Among them, the front-wheel drive system includes the engine, clutch, transmission and final drive. The power of the engine is transmitted through the clutch, the transmission, and the final drive to drive the front wheels.

The rear wheel electric drive system includes a power battery, two wheel side motors and two sets of synchronous belt reduction mechanisms. The power battery supplies power to the wheel side motors through electrical connections. The shell of the wheel side motors is consolidated with the single swing arm of the suspension. The rotor output shaft of the motor is fixedly connected to the small pulley, one end of the half shaft is fixedly connected to the large pulley, the large and small pulleys are connected through the timing belt, and the other end of the half shaft is fixedly connected to the hub of the driving wheel; the output torque of the wheel side motor passes through the timing belt The small pulley, synchronous belt, and large pulley of the synchronous belt are transmitted to the half shaft and hub, and drive the rear wheel; there is no direct mechanical connection between the engine and the wheel motor, and they realize the conversion of the vehicle driving mode through the vehicle controller.

The suspension single swing arm is a suspension single trailing arm or a suspension single oblique arm.

The beneficial effects of the present invention are:

1) The use of this distributed hybrid drive scheme can make the mass distribution of the vehicle reasonable, and the front and rear wheels have power output to form all-wheel drive, and the performance of the vehicle is better. Compared with the transmission of all-wheel drive vehicles, the mechanism is simplified, the transmission efficiency is high, and the configuration of hybrid vehicles greatly improves the economy of the vehicle;

2) This kind of distributed hybrid drive scheme is more suitable for the conversion of traditional internal combustion engine vehicles to new energy vehicles. Since the development of new energy vehicles is more difficult, it is undoubtedly the most convenient and realistic way to refit from traditional internal combustion engine vehicles to new energy vehicles. This kind of distributed drive system can completely retain the traditional engine power transmission mechanism of the front and front drive, and only need to install two sets of wheel-side electric drive systems that are independently controlled and driven by synchronous belt reduction for the rear wheels, so it is very suitable for traditional vehicles. Conversion to new energy vehicles;

3) Compared with the centralized motor drive, the wheel-side electric drive system is more flexible in arrangement, the transmission chain is shorter, the transmission efficiency of the drive system is higher, the torque of each drive wheel is independently controllable, and the dynamic control of the chassis system is more flexible and convenient;

4) Compared with the gear transmission, the deceleration mechanism of the wheel electric drive system can better meet the center distance requirements of the wheel electric drive system. The smoothness and handling stability of the car, and because the synchronous belt has high transmission efficiency and strong adaptability, it does not require lubrication and sealing, so the cost is lower.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural arrangement drawing of single rear wheel drive device among the present invention;

Explanation of symbols in the figure

1 - front wheel; 2 - engine;

3-clutch; 4-small pulley;

5-large pulley; 6-synchronous belt;

7-Wheel motor; 8-Power battery;

9 - transmission; 10 - final drive;

11-rubber bushing; 12-suspension single swing arm;

13-Wheel rim; 14-Wheel hub;

15-wheel bearing; 16-drum brake;

17-drum brake bottom plate; 18-half shaft sleeve;

19-half shaft; 20-bearing;

21 - rear wheel.

Detailed ways

Referring to the accompanying drawings, the present invention will be further described.

As shown in Fig. 1 and Fig. 2, the present invention provides a hybrid electric vehicle drive system using a synchronous belt drive, that is, the front wheels are powered by the engine, and each rear wheel is powered by a wheel-side electric drive system. The specific transmission scheme is: it is composed of a front-wheel engine drive system and two sets of independently controlled rear-wheel electric drive systems, wherein the front-wheel drive system includes an engine 2, a clutch 3, a transmission 9 and a final drive 10, and the power of the engine 2 is passed through The clutch 3, the speed changer 9, and the final drive 10 transmit and drive the front wheels.

The rear wheel electric drive system includes a power battery 8, two wheel side motors 7 and two sets of synchronous belt reduction mechanisms. The power battery 8 supplies power to the wheel side motors 7 through electrical connections, and the suspension single swing arm 12 is hinged on the On the vehicle frame, the housing of the wheel side motor 7 is consolidated with the suspension single swing arm 12, the rotor output shaft of the wheel side motor 7 is fixedly connected with the small pulley 4, and one end of the half shaft 19 is fixedly connected with the large pulley 5. The pulley is connected through the timing belt 6, the other end of the half shaft 19 is supported in the half shaft sleeve 18 by the hub bearing 15, the half shaft sleeve 18 is fixedly connected with the single swing arm 12 of the suspension, and the half shaft is fixedly connected with the driving wheel hub 14 , the hub 14 is fixedly connected to the drum brake 16 and the rim 13 by bolts. The output torque of wheel side motor 7 is transmitted to axle shaft 19 and wheel hub 14 through synchronous belt small pulley 4, synchronous belt 6 and synchronous belt large pulley 5, then to wheel rim 13, and finally drives rear wheel 21. There is no direct mechanical connection between the engine 2 and the wheel motor 7, and they realize the conversion of the driving mode of the vehicle through the vehicle controller.

The suspension single swing arm 12 is a suspension single trailing arm or a suspension single oblique arm.

Its specific driving strategy of the described hybrid electric vehicle drive system is: when the vehicle starts, the rear wheel 21 is driven by the wheel motor 7 through the synchronous belt reduction mechanism to reduce the speed and increase the torque, while the engine 2 does not work at this time, so that the It realizes the advantages of low-speed, high-torque and good acceleration of the deceleration wheel-side electric drive, and avoids the disadvantage of high fuel consumption rate of the engine at low load rate. In urban working conditions with low demand torque at low speeds, the power required by the vehicle is low, and the power of the two wheel motors 7 is fully sufficient to provide vehicle power, and the vehicle is running in pure electric conditions; when the vehicle is in high-speed or climbing conditions, etc. When the power requirement of the vehicle is relatively high, the engine 2 can be turned on at this time to make the vehicle work in a hybrid mode to jointly provide the power demand of the vehicle; 2. Charge the power storage battery 8 through the generator (this motor is the starter motor of the engine) to realize the function of charging while the vehicle is driving or parking; the wheel side motor 7 can also absorb the braking energy when the car brakes to provide power The storage battery 8 is charged to realize the feedback function of braking energy. The vehicle controller realizes the energy management of the vehicle, reasonably distributes the power of the engine 2 and the motor 7, so that the engine 2 and the motor 7 can work in the area with the lowest fuel consumption and the lowest efficiency, thereby greatly improving the efficiency of the vehicle and effectively extending the Increase the mileage of the car and improve the economy and power.

The above-mentioned specific embodiments are only exemplary, and are intended to better enable those skilled in the art to understand this patent, and should not be understood as limiting the scope of this patent. The wheel-side electric drive type of the deceleration single-swing arm suspension, or any equivalent change or modification based on it, all belong to the protection scope of the present invention. the

Claims (2)

1. A hybrid electric vehicle drive system that adopts a synchronous belt drive, is characterized in that: the drive system is composed of a front-wheel engine drive system and two groups of independently controlled rear-wheel electric drive systems; wherein, the front-wheel engine drive system includes Front engine, clutch, transmission and final drive, the power of the engine is transmitted through the clutch, transmission and final drive to drive the front wheels; the rear wheel electric drive system includes power batteries, two wheel motors and two sets of synchronous belt reduction mechanisms, The power battery supplies power to the wheel motor through electrical connection, the shell of the wheel motor is fixed with the single swing arm of the suspension, the rotor output shaft of the wheel motor is fixedly connected to the small pulley, and one end of the half shaft is fixedly connected to the large pulley. The large and small pulleys are connected by a synchronous belt, and the other end of the half shaft is fixedly connected with the hub of the driving wheel; the output torque of the wheel side motor is transmitted to the half shaft and the hub through the small pulley of the synchronous belt, the synchronous belt, and the large pulley of the synchronous belt, and drives the rear There is no direct mechanical connection between the engine and the wheel motors, and they realize the conversion of the driving mode of the vehicle through the vehicle controller. 2. The hybrid electric vehicle drive system using synchronous belt transmission according to claim 1, wherein the suspension single swing arm is a suspension single trailing arm or a suspension single oblique arm.

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