CN206086367U - Formula electric drive assembly is arranged to double row star - Google Patents

Abstract

The utility model relates to a formula electric drive assembly is arranged to double row star, by the transaxle, back row planetary gear mechanism, the planet carrier the ring gear stopper, front -seat planetary gear mechanism, first motor, the second motor, the clutch, the stopper is constituteed, front -seat planetary gear mechanism is by front -seat sun gear, front -seat planet wheelset, the planet carrier the ring gear is constituteed, back row planetary gear mechanism is by the back row planet carrier, the epaxial back row sun wheel of sun gear owner, back row planet wheelset, the planet carrier the ring gear is constituteed, the rotor of first motor is connected with back row sun wheel through the sun gear main shaft, the sun gear main shaft is brakied through the stopper, the rotor of second motor is connected through hollow shaft and front -seat sun gear, first motor and second motor are with the axis of rotation and arrange at the homonymy, be provided with the clutch between first motor and the second motor. This formula electric drive assembly is arranged to double row star simple structure controls the convenience.

Description

A double planetary row electric drive assembly

technical field

The utility model relates to a double planetary row electric drive assembly.

Background technique

In order to improve economy and power, some dual-planetary dual-motor power coupling assemblies are applied to pure electric vehicles. The structure of the traditional dual-motor drive assembly is complicated. When switching between the torque coupling mode and the speed coupling mode, it is necessary to control multiple components (such as multiple clutches and multiple locks) at the same time. The linkage control device and control The methods are relatively complicated; in the patent CN201310117747.0, the structural scheme of a common sun gear is adopted, which results in a small transmission ratio when the No. 1 motor single-drive starts and needs to increase the maximum torque of the motor, which obviously brings about an increase in the cost and volume of the motor. In addition, when switching between the torque coupling mode and the speed coupling mode, two clutches and a lock-up device need to be controlled simultaneously, and the linkage control device and control are complicated; the patent CN201410584883.5 adopts the structural scheme of the common ring gear, which is To make up for the lack of power output from the ring gear to the planetary carrier when the No. 1 motor is single-driven, a reducer design is added to the system. In addition, a coupling design is used between the two ring gears, which will make the system more complicated, increase cost and have certain noise. In addition, in order to solve the problem of the layout of the three lockers, the two motors can only be designed in parallel, and the flexibility of the structural design is insufficient.

Utility model content

In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a double-planet row electric drive assembly with simple structure and simple control.

In order to solve the above technical problems, the technical solution of the utility model is: a double planetary electric drive assembly, which consists of a drive axle, a rear planetary gear mechanism, a planet carrier-ring gear brake, a front planetary gear mechanism, a first motor, second motor, clutch and brake, the front row planetary gear mechanism is composed of front row sun gear, front row planetary gear set, planetary carrier-ring gear, and the rear row planetary gear mechanism is composed of rear row planetary carrier, The rear sun gear on the sun gear main shaft, the rear planetary gear set, and the planet carrier-ring gear, the rotor of the first motor is connected to the rear sun gear through the sun gear main shaft, and the sun gear main shaft is braked by the brake. The rotor of the second motor is connected to the front row sun gear through the hollow shaft, the first motor and the second motor are arranged on the same rotation axis and on the same side, and a clutch is arranged between the first motor and the second motor.

Preferably, the brake is fixedly connected to the casing, the ring gear of the front row planetary gear mechanism is connected in the casing, and the front row planetary gear mechanism and the rear row planetary gear mechanism are connected through the planet carrier-ring gear , A planet carrier-ring gear brake is arranged between the planet carrier-ring gear and the housing, and the rear planet carrier of the rear planet gear mechanism is output to the drive axle.

Preferably, the sun gear main shaft is sleeved in the hollow shaft, and the sun gear main shaft and the hollow shaft are coupled or separated through a clutch.

Compared with the prior art, the utility model has the following beneficial effects: the double planetary row electric drive assembly has a simple structure, and can be realized through the planetary carrier-ring gear brake, braking or releasing of the brake, and coupling or separation of the clutch Single motor or double motors participate in the work to meet various operating conditions of the vehicle, and the control is simple; the design of dual motors and output shafts on the same axis of rotation facilitates the structural layout of the vehicle, and not only solves the structural problem of the existing dual motors and double planetary row power. The difficulty of arranging and controlling multiple actuators of the coupling system also greatly improves the working reliability of the system.

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Description of drawings

Fig. 1 is a structural diagram of the utility model embodiment.

Fig. 2 is a transmission principle diagram in a single first motor driving mode.

Fig. 3 is a transmission principle diagram in a single second motor driving mode.

Fig. 4 is a schematic diagram of the transmission under the dual-motor torque coupling driving mode.

Fig. 5 is a schematic diagram of the transmission in the dual-motor speed coupling driving mode.

In the figure: 1-drive axle, 2-rear planetary gear mechanism, 3-planet carrier-ring gear brake, 4-front planetary gear mechanism, 5-first motor, 6-second motor, 7-clutch, 8 -brake, 9-front sun gear, 10-front planetary gear set, 11-planet carrier-ring gear, 12-rear planet carrier, 13-sun gear spindle, 14-rear sun gear, 15-rear row Star wheel set, 16-hollow shaft, 17-housing.

detailed description

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific examples are given together with the accompanying drawings and described in detail as follows.

As shown in Figures 1 to 5, a double planetary electric drive assembly consists of a drive axle 1, a rear planetary gear mechanism 2, a planetary carrier-ring gear brake 3, a front planetary gear mechanism 4, and a first motor 5 , the second motor 6, the clutch 7, the brake 8, the front planetary gear mechanism is composed of the front sun gear 9, the front planetary gear set 10, the planet carrier-ring gear 11, and the rear planetary gear mechanism is composed of The rear planetary carrier 12, the rear sun gear 14 on the sun gear main shaft 13, the rear planetary gear set 15, and the planetary carrier-ring gear, the rotor of the first motor is connected to the rear sun gear through the sun gear main shaft, The main shaft of the sun gear is braked through a brake, and the rotor of the second motor is connected to the front row sun gear through a hollow shaft 16. The first motor and the second motor are arranged on the same rotation axis and on the same side. A clutch is arranged between the two motors.

In the embodiment of the present utility model, the brake is fixedly connected to the housing 17, the ring gear of the front row planetary gear mechanism is connected in the housing, and the front row planetary gear mechanism and the rear row planetary gear mechanism are connected through The planetary carrier and the ring gear are connected, and a planetary carrier-ring gear brake is arranged between the planetary carrier-ring gear and the housing, and the rear planetary carrier of the rear planetary gear mechanism is output to the drive axle.

In the embodiment of the utility model, the main shaft of the sun gear is sleeved in the hollow shaft, and the main shaft of the sun gear and the hollow shaft are coupled or separated through a clutch.

A driving method of a double-planetary electric drive assembly is carried out in the following steps:

(1) The working mode of the first motor is divided into the single first motor drive mode and the single first motor braking energy recovery mode. In the single first motor drive mode, the planet carrier-ring gear brake locks the planet carrier-ring gear, The clutch disengages and the brake is released;

Single first motor drive mode: the first motor works in electric mode, the second motor stops working, and the output power of the first motor is sequentially transmitted through the sun gear main shaft, rear sun gear, rear planetary gear set, and rear planet carrier to drive axle;

Single first motor braking energy recovery mode: the first motor works in the power generation mode, and the vehicle inertia torque sequentially passes through the drive axle, the rear planetary carrier, the rear planetary wheel set, the rear sun gear, and the sun gear main shaft to drag the first motor. A motor rotates to generate electricity and charges the energy storage device connected to the phase;

(2) The working mode of the second motor is divided into single second motor driving mode and single second motor braking energy recovery mode. ;

Single second motor drive mode: the second motor works in the electric mode, the first motor stops working, and the output power of the second motor passes through the front sun gear, front planetary gear set, planet carrier-ring gear, and rear planetary gear in turn. The wheel set and the rear planet carrier are sent to the drive axle;

Single second motor braking energy recovery mode: the second motor works in the power generation mode, and the vehicle inertia torque passes through the drive axle, rear planetary carrier, rear planetary gear set, planetary carrier-ring gear, and front planetary gear set in sequence , The front sun gear drives the second motor to rotate to generate electricity, and charges the energy storage device connected to it;

(3) The working mode of dual-motor torque coupling is divided into dual-motor torque coupling driving mode and dual-motor torque coupling braking energy recovery mode. In the dual-motor torque coupling driving mode, the planet carrier-ring gear brake is released, and the clutch engaged, brake released;

Dual-motor torque coupling drive mode: the first motor and the second motor work in the electric mode, and under the action of the clutch, the first motor and the second motor become a whole, and the output power of the two motors can be superimposed on the sun gear On the main shaft; at this time, the power flow is divided into two paths, which are finally coupled and superimposed at the rear planetary carrier and then sent to the drive axle; one of them passes through the sun gear main shaft, the rear sun gear, the rear planetary gear set, and the rear planetary carrier Conveying, the other way is conveyed through the main shaft of the sun gear, the front sun gear, the front planetary gear set, the planetary carrier-ring gear, the rear planetary gear set, and the rear planetary carrier. to drive axle;

Dual-motor torque coupling braking energy recovery mode: the first motor and the second motor work in the power generation mode, the vehicle inertia torque is shunted through the drive axle and finally converged to the main shaft of the sun gear to recover energy through the two motors; One way passes through the drive axle, the rear planetary carrier, the rear planetary gear set, the rear sun gear, and the sun gear spindle to drive the first motor to rotate and generate electricity, and to charge the energy storage device connected to the phase; the other way passes through the drive axle in turn , the rear planetary carrier, the rear planetary gear set, the planetary carrier-ring gear, the front planetary gear set, and the front sun gear (sun gear spindle) drive the second motor to rotate and generate electricity, and are electrically connected to the energy storage device Charge;

(4) The dual-motor speed coupling working mode is divided into dual-motor speed coupling driving mode and dual-motor speed coupling braking energy recovery mode. In the dual-motor speed coupling driving mode, the planet carrier-ring gear brake is released, the clutch is disengaged, and the brake is released ;

Double-motor speed coupling drive mode: the first motor and the second motor work in the electric mode, and the output power of the first motor is sequentially transmitted to the drive through the main shaft of the sun gear, the rear sun gear, the rear planetary gear set, and the rear planetary carrier. Bridge, the output power of the second motor is transmitted to the drive axle through the front sun gear, front planetary gear set, planet carrier-ring gear, rear planetary gear set, and rear planet carrier;

Double-motor speed coupling braking energy recovery mode: the first motor and the second motor work in the power generation mode, and the vehicle inertia torque is split and output, and all the way passes through the drive axle, rear planetary carrier, rear planetary wheel set, rear sun The main shaft of the main wheel and the sun gear drives the first motor to rotate and generate electricity, and the other road passes through the drive axle, the rear planetary carrier, the rear planetary gear set, the planetary carrier-ring gear, the front planetary gear set, and the front sun gear to drive the second The two motors rotate to generate electricity, and the first motor and the second motor charge the electrically connected energy storage devices respectively.

Through the planetary carrier-ring gear brake, clutch, and brake, multiple working modes of the dual motors can be obtained. The combined state is shown in Table 1, where "1" indicates that the planetary carrier-ring gear brake, brake, and clutch are in the locked state Or combined state, "0" means that the planetary carrier-ring gear brake, brake, and clutch are released or separated, "M" means that the motor is under electric control, "G" means that the motor is under power generation control, and "C" means that the motor is off.

Table 1 Working Mode

In the front-row planetary gear mechanism, assume that the characteristic parameter K ₁ =Z _R1 /Z _S1 =2, that is, the ratio of the number of teeth of the ring gear of the front-row planetary gear mechanism to the number of teeth of the front-row sun gear. In the rear row of planetary gear mechanism, Assume first that the characteristic parameter K ₂ =Z _R2 /Z _S2 =2, that is, the ratio of the number of teeth of the ring gear of the rear row of planetary gears to the number of teeth of the rear row of sun gears, the kinematic equation of the front row of planetary gears is: N _s1 +K ₁ N _R1 −(K ₁ +1)N _C1 =0. Among them, N _s1 , N _R1 and N _C1 are the rotational speeds of the front sun gear, ring gear and planet carrier in the front row planetary gear mechanism respectively, and the kinematic equation of the rear row planetary gear mechanism is: N _s2 +K ₂ N _R2 - (K ₂ +1)N _C2 =0. Among them, N _s2 , N _R2 and N _C2 are the rotational speeds of the rear sun gear, the ring gear and the planet carrier in the rear planetary gear mechanism respectively.

In the single first motor drive, the transmission ratio in this mode can be deduced as i ₁ =N _o /N _m1 =K ₂ +1=3 from the kinematics equation of the rear planetary gear mechanism and the connection relationship of components. In this way, the torque of the first motor can be amplified by 3 times to drive the car, and the rotation direction of the first motor in FIG. 2 is the same as that of the output shaft.

In single-second motor drive, the power of the second motor can be decelerated and torque-increased by the front row planetary gear mechanism and rear row planetary gear mechanism in turn to drive the vehicle at a low speed, and the transmission ratio is i ₂ =N _o /N _m2 =(K ₁ +1)(K ₂ +1)=9. In this way, the torque of the second motor can be amplified by 9 times to drive the car, and the second motor can still cope with the low-speed running condition of the vehicle alone when the first motor fails. Figure 3 shows that the rotation direction of the second motor is the same as that of the output shaft.

In the dual-motor torque coupling drive, the torque coupling of the power of the first motor and the second motor to drive the vehicle through the front row planetary gear mechanism and the rear row planetary gear mechanism is realized. After derivation, the rotational speed transmitted to the driving axle is N _o =N _m1 [K ₂ /(K ₂ +1)/(K ₁ +1)+1/(K ₂ +1)]=1/3N _m1 ; The torque transmitted to the drive axle is T _o =3(T ₁ +T ₂ ). In this way, it is equivalent to multiplying the torques of the first motor and the second motor by 3 times and adding them together to drive the car. Figure 4 shows that the rotation direction of the first motor and the second motor is the same as that of the output shaft.

In dual-motor rotational speed coupling driving, the vehicle is driven after realizing the power rotational speed coupling of the first motor and the second motor. The deduced rotational speed transmitted to the driving axle is N _o =1/3N _m1 +2/9N _m2 . In this way, it is equivalent to adding 1/3 of the rotational speed of the first motor and 2/9 of the rotational speed of the second motor to obtain the rotational speed on the output shaft.

The utility model is not limited to the above-mentioned best implementation mode, anyone can draw other various forms of double planetary row electric drive assembly under the enlightenment of the utility model. All equivalent changes and modifications made according to the patent scope of the utility model should belong to the scope of the utility model.

Claims (3)

1. A dual-planet electric drive assembly, characterized in that: by drive axle, rear planetary gear mechanism, planetary carrier-ring gear brake, front row planetary gear mechanism, first motor, second motor, clutch, Brakes, the front row planetary gear mechanism is composed of the front row sun gear, front row planetary gear set, planetary carrier-ring gear, the rear row planetary gear mechanism is composed of the rear row planetary carrier, the rear row sun The rotor of the first motor is connected with the rear sun gear through the main shaft of the sun gear, the main shaft of the sun gear is braked through the brake, and the rotor of the second motor is braked through the The hollow shaft is connected with the front row sun gear, the first motor and the second motor are arranged on the same rotation axis and on the same side, and a clutch is arranged between the first motor and the second motor. 2. The double planetary row electric drive assembly according to claim 1, characterized in that: the brake is fixedly connected to the housing, the ring gear of the front row planetary gear mechanism is connected in the housing, and the front The row planetary gear mechanism and the rear row planetary gear mechanism are connected through the planet carrier-ring gear, and a planet carrier-ring gear brake is arranged between the planet carrier-ring gear and the housing, and the rear row planet carrier of the rear row planet gear mechanism outputs to the transaxle. 3. The dual planetary row electric drive assembly according to claim 1, characterized in that: the sun gear main shaft is sleeved in the hollow shaft, and the sun gear main shaft and the hollow shaft are coupled or separated via a clutch .