CN209700365U - A kind of double-pinion planetary row drive system of electric motor vehicle - Google Patents

Abstract

The utility model discloses a kind of double-pinion planetaries to arrange drive system of electric motor vehicle, comprising: electrical drive portion and speed changer；Wherein, the speed changer includes the first planet row, the second planet row and clutch；The electrical drive portion includes first motor and the second motor；The first motor includes first motor axis, stator and rotor；Wherein, the stator of first motor is fixedly connected with the shell of drive system, and the rotor of first motor is fixedly connected with first motor axis；Second motor is connect with the external gear of the second planet row ring gear.Double-pinion planetary provided by the utility model arranges drive system of electric motor vehicle, compact-sized, is easily installed, reduce the complexity of control system, the energy consumption in vehicle operation can be reduced by drive and control of electric machine shifting power, improve vehicle economy energy.

Description

A dual-stage planetary row electric vehicle drive system

technical field

The utility model belongs to the technical field of automobile drive systems, in particular to a double-stage planetary row electric vehicle drive system.

Background technique

The development of the automobile industry pollutes the human living environment very much, especially in big cities. The exhaust gas emitted by various motor vehicles seriously endangers human health. This hazard is particularly serious in industrially developed countries. An electric vehicle refers to a vehicle powered by a vehicle-mounted power supply, driven by a motor to drive the wheels, and conforming to the requirements of road traffic and safety regulations. Due to its smaller impact on the environment than traditional cars, its prospects are widely optimistic. The electric drive system does not emit any substances, that is, zero emissions, and is environmentally friendly. Therefore, gradually replacing gasoline vehicles with electric vehicles is the direction of efforts of all countries in the world today.

The automobile transmission is a transmission device used to coordinate the engine speed and the actual driving speed of the wheels, and is used to exert the best performance of the engine. The transmission can produce different gear ratios between the engine and the wheels while the car is running. The engine can be operated at its best power performance state by shifting gears.

Two-speed transmissions for electric vehicles generally adopt a parallel shaft arrangement or a planetary row arrangement. For a two-speed transmission that adopts a planetary row arrangement, the shifting of gears is mostly achieved through a combination of clutches or brakes.

Utility model content

The purpose of this utility model is to provide a two-stage planetary row electric vehicle drive system, which has a compact structure, is easy to install, reduces the complexity of the control system, can control the shifting power through the motor drive, and can reduce the energy during the operation of the vehicle. Consumption, improve vehicle economic performance.

The technical scheme provided by the utility model is:

A two-stage planetary row electric vehicle drive system, comprising:

An electric drive part and a transmission; wherein, the transmission includes a first planetary row, a second planetary row and a clutch; the electric drive part includes a first motor and a second motor; the first motor includes a first motor shaft, a stator and the rotor; wherein, the stator of the first motor is fixedly connected to the casing of the drive system, the rotor of the first motor is fixedly connected to the shaft of the first motor; the second motor is connected to the outer gear of the second planetary ring gear.

The beneficial effects of the utility model are:

The dual-stage planetary row electric vehicle drive system provided by the utility model has a compact structure, is easy to install, reduces the complexity of the control system, can control the shifting power through the motor drive, can reduce the energy consumption during the operation of the vehicle, and improve the vehicle economy. performance.

Description of drawings

Fig. 1 is a structural schematic diagram of a two-speed transmission based on a two-stage planetary row according to the present invention.

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it by referring to the description.

As shown in Figure 1, the utility model provides a dual-stage planetary row electric vehicle drive system, which mainly includes: an electric drive part and a transmission; wherein, the transmission is composed of the first planetary row, the second planetary row and a clutch; the electric drive The section includes a first motor and a second motor.

The first motor is composed of a first motor shaft 110 , a stator 120 and a rotor 130 . Wherein, the stator 120 of the first motor is fixedly connected to the housing 100, the rotor 130 of the first motor is fixedly connected to the first motor shaft 110, the second motor 360 is a reversible motor, and the second motor 360 is connected to the second planetary row internal gear The external gear of ring 350 is connected, and the external gear is integrated with the second planetary ring gear 350 . The first motor shaft 110 is rotatably connected to the casing 110 and connected to the first planetary sun gear 220; the output shaft 140 extends to the outside of the casing. The first planetary row sun gear 220 is installed on the end of the first motor shaft 110, and the first planetary row planetary gear 230 meshed with the first planetary row sun gear 220 is installed on the left end of the first planetary row planetary gear shaft 240. The first planetary row The star gear shaft 240 is installed on the first planetary planet carrier 210 through bearings, and the first planetary inner ring gear 250 meshed with the first planetary planetary gear 230 is connected with the first planetary sun gear 220 through a clutch 410. The planetary carrier 210 is connected to the housing 100 through a brake 420 . The second planetary row sun gear 320 is fixedly installed on the second planetary row sun gear shaft 330, and the second planetary row planetary gear 340 is installed on the second planetary row carrier 310 through bearings, and the second planetary row carrier 310 is connected to the second planetary row carrier 310. The output shaft 140 is connected, and the second planetary ring gear 350 is fixedly connected with the housing 100 . The clutch hub of the clutch 410 (normally open) is connected to the first planetary ring gear 250, the clutch disc of the clutch 410 (normally open) is connected to the first motor shaft 110, and is realized by the separation and combination of the clutch 410 (normally open). Separation and combination of the first planetary ring gear 250 and the first motor shaft 110 . The brake hub of the brake 420 is connected to the housing 100 and is fixed, and the brake disc of the brake 420 is connected to the first planetary carrier 210, and the first planetary carrier 210 is realized through the separation and combination of the brake 420. Turn and brake.

The gear shifting of the driving system is realized by a clutch 410 (normally open) and a brake 420 . It specifically includes: in the first gear, the first motor rotates forward, the clutch 410 does not work, the first planetary planetary ring gear 250 is separated from the first motor shaft 110, the brake 420 works to play a braking role, and through the second planetary The star frame 310 transmits the power to the output shaft 140 to realize power transmission. In the second gear, the first motor rotates forward, the clutch 410 works, and the power is transmitted to the output shaft 140 through the second planetary carrier 310 to realize power transmission. In the process of upgrading from the first gear to the second gear, the clutch 410 is switched to the working state through the gear shift control unit; the brake 420 is switched to the non-working state, and the first planetary carrier 210 is switched from being fixedly connected with the housing 100 to being connected with the housing 100 Separation is rotatable. In the process of downshifting from the second gear to the first gear, the clutch 410 is switched to the non-working state and the brake 420 is switched to the working state through the shift control unit. When in reverse gear, the first motor reverses, the clutch 410 does not work, the first planetary planetary ring gear 250 is separated from the first motor shaft 110, the brake 420 works to play a braking role, and the second planetary planetary carrier 310 The power is transmitted to the output shaft 140 to realize the output of power and make the whole vehicle run backwards. When in neutral, both the clutch 410 and the brake 420 remain in a non-working state, so that the first motor shaft 110 and the output shaft 140 are in a disengaged state, cutting off power transmission. When the vehicle needs to be braked while driving in first gear, the first motor and the second motor switch from the motor mode to the generator mode to brake the transmission system and convert the driving kinetic energy of the vehicle into electric energy. When the whole vehicle needs to be braked when running in the second gear, the first motor and the second motor are switched from the motor mode to the generator mode, the clutch 410 does not work, and the brake 420 works, which plays a dragging role on the transmission system.

The working process of the dual-stage planetary row electric vehicle drive system provided by the utility model is as follows:

Step 1. When the vehicle is running, obtain the vehicle speed, accelerator opening, vehicle quality and road gradient through the sensor, and the controller receives the above signals, and according to the vehicle speed, accelerator opening, vehicle quality and road gradient Determine the reference gear coefficient of the vehicle;

Wherein, the reference gear coefficient of the vehicle is:

Among them, ξ is the correction parameter; α is the throttle opening, α ₀ is the reference throttle opening; m is the vehicle mass, unit Kg; m ₀ is the reference vehicle mass, unit Kg; v is the vehicle speed, Km/h ; v ₀ is the reference vehicle speed, Km/h; i is the road slope, |i| represents the absolute value of the road slope; e is the base of natural logarithm.

As a preference, the value of the correction coefficient ξ is:

When v≤50Km/h, ξ=0.6;

When v>50Km/h, ξ=1.

Step 2, obtaining the outdoor environment temperature, humidity and road surface adhesion coefficient, the controller receives the above-mentioned signal, and determines the environment coefficient of vehicle driving according to the outdoor environment temperature, humidity and road surface adhesion coefficient;

Wherein, the environmental factor of described vehicle driving is:

Among them, a and b are correction parameters; μ is the road surface adhesion coefficient, RH is the relative humidity of the environment; RH ₀ is the relative humidity of the reference environment; T is the ambient temperature, the unit is ℃; T ₀ is the reference ambient temperature, the unit is ℃; The base of the logarithm.

As a further preference, the values of the correction parameters a and b are determined according to the temperature and humidity as:

When RH<50%, a=0.6;

When RH≥50%, a=0.7; and

When T≤0℃, b=0.6;

When T>0°C, b=0.4.

Step 3: The controller judges the appropriate gear position of the vehicle in the current driving state according to the reference gear index of the vehicle and the environment index of the vehicle running. The specific judgment process is as follows:

Determine the current gear coefficient according to the reference gear coefficient of the vehicle and the environmental coefficient of the vehicle running as:

I=I ₀ ·E;

Wherein, when I≤0.5, it is judged that the appropriate gear of the vehicle in the current driving state is the first gear;

When I>0.5, it is judged that the suitable gear position of the vehicle in the current driving state is the second gear.

According to the calculated gear position, the driver is reminded to shift gears.

Although the embodiment of the present utility model has been disclosed as above, it is not limited to the use listed in the description and the implementation, and it can be applied to various fields suitable for the present utility model. For those familiar with the art, Further modifications can be readily effected, so the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims (1)

1. A two-stage planetary row electric vehicle drive system, characterized in that it includes: an electric drive part and a transmission; wherein, the transmission includes a first planetary row, a second planetary row and a clutch; the electric drive part includes a first A motor and a second motor; the first motor includes a first motor shaft, a stator and a rotor; wherein, the stator of the first motor is fixedly connected to the housing of the drive system, and the rotor of the first motor is fixedly connected to the first motor shaft ; The second motor is connected with the external gear of the second planetary ring gear.