CN202215683U - Dual-planet row and dual-die hybrid power drive device - Google Patents

Abstract

The utility model discloses a dual-planet row and dual-die hybrid power drive device which comprises an engine, a first motor, a second motor, a planet carrier and a differential, wherein a first planet row and a second planet row are arranged on the planet carrier, a sun gear of the first planet row is connected with the engine, and an outer gear ring of the first planet row is connected with the differential; a sun gear of the second planet row is connected with the second motor, and the first motor is connected on the planet carrier; and a second wet-type clutch which can connect and disconnect the planet carrier and the sun gear of the first planet row is further arranged between the planet carrier and the sun gear of the first planet row. According to the dual-planet row and dual-die power drive device, multiple work modes can be realized, the requirements on the rotation speed and the torque of the motors as well as on the technology of the motors can be reduced, and the direct effect is that the motor manufacturing and processing difficulties are reduced.

Description

Dual-planetary dual-mode hybrid transmission

technical field

The invention relates to a hybrid power transmission device, in particular to a transmission device adopting planetary gear transmission.

Background technique

As a new energy-saving and environment-friendly vehicle, hybrid electric vehicles are in a vigorous development stage in terms of technology and market. Emphasizing and supporting my country's hybrid electric vehicle industry is a good development opportunity to quickly shorten the gap with the world's automobile technology level, and it is also a guarantee An important opportunity for the healthy and sustainable development of my country's auto industry. Compared with conventional vehicles and pure electric vehicles, the biggest difference between hybrid electric vehicles (HEV) is the power system. For parallel and hybrid HEVs, the power coupling system is responsible for combining multiple power sources of the HEV, realizing reasonable power distribution among multiple power sources and transmitting the power to the drive axle. It plays an important role in the development of HEVs. Its performance It is directly related to whether the performance of the HEV vehicle meets the design requirements, and is the core part of the HEV. The planetary gear system has the characteristics of multiple degrees of freedom, flexible and controllable input and output, and is compact in structure, small in size and large in speed ratio, so it is adopted by more and more power coupling systems of hybrid electric vehicles. A trend in the development of the assembly. the

In 1997, Toyota launched the first hybrid car Prius, and in 2005, it launched the 2006 Prius equipped with the latest third-generation electromechanical hybrid system. It still adopts the THS hybrid structure, and the smart and precise planetary gear system controls the output power of the engine. Redistribute to achieve the purpose of reasonably balancing the engine load. Figure 1 is the structural diagram of Toyota Prius hybrid transmission, in which 1, engine, 2, crankshaft, 3, reducer, 4, generator MG1, 5, planetary gear train, 6, sun gear, 7, planetary gear , 8, outer ring gear, 8a, ring gear driving sprocket, 9, planet carrier, 10, silent chain, 11, reduction gear, 12, passive gear. 13, reduction gear, 14, differential gear, 15a, b, driving wheels, 16, electric motor MG2. Its hybrid system assembly is composed of engine (Engine), generator (MG1), motor (MG2), power coupling system, inverter and power storage battery and other components. In this mechanism, the engine is connected with the planet carrier, the power is transmitted to the outer ring gear and the sun gear through the planetary gear, the ring gear shaft is connected with the motor and the drive shaft, and the sun gear shaft is connected with the generator. The system transfers most of the engine's torque directly to the drive shaft and a small portion of the torque to the generator, which generates electricity that is used to charge the battery or the electric motor on command to increase drive. This structure can make changes by adjusting the rotating speed of the generator, so that the engine is always in a high efficiency zone or a low emission zone. In addition, by adjusting the rotation speed of each element of the planetary row, it works like a continuously variable transmission. the

Features of this structure:

1) The power coupling system adopts a single planetary row three-axis transmission system;

2) The two motors are respectively arranged on both sides of the planetary row;

3) The chain transmission technology is adopted between the output ring gear of the planetary row and the intermediate gear shaft;

4) Due to the infinitely variable speed of the planetary gear, the engine speed has no direct relationship with the vehicle speed; and the engine is the main power source, and the engine provides all the energy during the entire running process. Therefore, the key to vehicle control is to find the best efficiency point of the engine at a certain power, that is, to realize optimal control of the engine by adjusting the speed of the motor MG1.

5) The output shaft of the motor MG2 is fixedly connected to the planetary outer ring gear. When starting purely electric, only the MG2 needs to be controlled, and the system drive control is very simple. the

Disadvantages of existing technology:

1. Motor layout:

The two motors are arranged on both sides of the planetary row, the cooling system layout is complex, the integration of the motor system is low, and the left and right transmission shafts on both sides of the planetary row are not equal in length, which is not conducive to the layout of the front cabin. The motor MG1 and the engine are arranged side by side on the right side of the planetary row. Since the distance between the two is relatively close, and the optimum operating temperature of MG1 is 60°C, which is lower than the optimum operating temperature of the engine at 90°C, the MG1 shell will be affected by the heat dissipation of the engine shell quickly. If it is raised, the motor cooling system will often be in the working state of cooling MG1, which will affect the efficiency of the whole vehicle. Since MG1 and MG2 share a cooling system, and MG1 and MG2 are arranged on both sides of the planetary row, the heat dissipation system is relatively complicated and the integration level is low, resulting in increased cost and low reliability.

2. The low reduction ratio of the single planetary gear train will affect the system:

(a) The hybrid system has too high requirements on the performance of the motor;

The hybrid power system has a wide range of motor speed variations, and has very strict requirements on motor manufacturing accuracy, speed/torque characteristics and dynamic balance.

(b) The hybrid system requires too much space layout;

In order to achieve a sufficient reduction ratio, the transmission gear reduction system has too high requirements for space layout, and the reduction device uses multi-stage transmission components including chain transmission, which further increases the complexity of the system.

3. The locking function of the motor MG1 is missing, and its working efficiency drops significantly under certain working conditions;

During certain vehicle driving conditions, due to fluctuations in required power, the motor MG1 always needs to be controlled to fluctuate around zero speed to adjust the power output of the engine. Under this working condition, the working efficiency of MG1 is very low, and there will always be some fluctuations in the output power and power demand of the system, and there is also a certain hysteresis, which increases the difficulty of control.

Contents of the invention

technical problem

In order to overcome the above-mentioned shortcomings, the present invention designs and develops a dual-planetary dual-mode hybrid power transmission device dedicated to hybrid vehicles, which realizes high-efficiency transmission through ingenious structural design, and can reduce the speed and torque of the motor at the same time. Requirements, can realize the coupling of multiple power sources of hybrid electric vehicles, and realize the requirements of various functions of hybrid electric vehicle control.

Technical solutions

In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a dual-planetary double-mode hybrid power transmission device, including an engine, a first motor, a second motor, a planetary carrier and a differential, characterized in that: The planet carrier is provided with a first planetary row and a second planetary row, the sun gear of the first planetary row is connected to the engine, the outer ring gear of the first planetary row is connected to the differential The sun gear of the second planetary row is connected with the second motor, and the planetary gear of the second planetary row is also meshed with the outer ring gear of the first planetary row. There is also a first wet clutch that closes or disconnects the outer ring gear of the second planetary row and the sun gear of the second planetary row between the outer ring gear of the planetary row and the sun gear of the second planetary row; A motor is connected to the planet carrier; between the planet carrier and the sun gear of the first planet row, there is also a second wet clutch that closes or disconnects the planet carrier and the sun gear of the first planet row .

A first brake for locking the planet carrier is also arranged on the planet carrier, and a second brake for locking the outer ring gear of the second planet row is also arranged on the second planet row. the

The innovation of the present invention is:

(1) This dual-planetary dual-mode hybrid transmission device is a domestic original mechatronic hybrid transmission system drive assembly, and its core is a dual-planetary five-axis gear transmission system;

(2) The dual motors are arranged on the same side of the planetary row, and the engine is arranged on the other side of the planetary row, and its control and cooling system are easier to integrate;

(3) The dual motors are arranged on the same side of the planetary row, which can realize the integration of motor manufacturing and assembly, reduce the volume of the transmission system, and facilitate the structural layout of the vehicle;

(4) The outer ring gear r1 of the first planetary row meshes with the planetary gear of the first planetary row and the planetary gear of the second planetary row at the same time, which can realize the direct transmission of the power of the engine and the motor MG2 to the output shaft.

(5) When starting the engine, according to different working conditions, the engine can be started independently by using the motor MG1, or by locking the outer ring gear r2 through B0, and using the motor MG2 to start the engine alone; the two schemes ensure the reliability of the engine starting process;

(6) This dual-mode structure can realize pure electric operation of motor MG1 alone under pure electric working conditions, and realize pure electric operation of motor MG2 alone and combined pure electric operation of dual motors by controlling B0 to lock the outer ring gear s2;

(7) This dual-mode structure can enable the hybrid operation of the motor MG1 and the engine, the hybrid operation of the motor MG2 and the engine, and the hybrid operation of the dual motors and the engine under hybrid power conditions;

(8) By controlling B0 to lock the outer ring gear r2, and controlling the clutch C1 to couple the motor MG2 and the outer ring gear r2, a fixed speed ratio transmission under the low-speed hybrid mode is formed;

(9) By controlling the clutches C1 and C2, the system forms a variety of working modes, which can reduce the requirements on the speed and torque of the motor, and reduce the difficulty of manufacturing the motor;

(10) Double motors are used for speed regulation control, which has more degrees of freedom and can make the engine always work in the best efficiency area;

(11) Use the clutch B1 to control the locking of the motor MG1, and the brake B0 to lock the outer ring gear r2, which can reduce energy loss and improve the efficiency of the system;

(12) In the hybrid power mode, by controlling the clutch C2 to synchronize the speed of the motor MG1 and the engine, the efficiency of the system can be improved and the control method can be simplified;

(13) In the hybrid power mode, by controlling the simultaneous locking of the clutch C1 and the clutch C2, the speed of the output shaft, the dual motors and the engine can be synchronized, simplifying the control method. the

Compared with prior art, advantage of the present invention:

1. The dual-planetary dual-mode hybrid transmission uses B1 to lock the generator MG1, and uses B0 to lock the external ring gear r2, which improves the overall efficiency of the system, but the Prius cannot lock the generator MG1 , there is always energy conversion, and the system efficiency is reduced;

2. The dual-planetary dual-mode hybrid transmission device can realize multiple working modes, which can reduce the requirements for the speed and torque of the motor and the requirements for the motor technology, and its direct effect is to reduce the difficulty of manufacturing the motor.

Description of drawings

Figure 1 is a structural diagram of the existing Toyota Prius hybrid transmission. the

Fig. 2 is a structural diagram of the transmission device of the present invention. the

Detailed ways

Figure 2 shows the structure diagram of the dual-planetary dual-mode hybrid power transmission. The device consists of engine (Engine), torsional damper, motor MG1, motor MG2, brake B0, brake B1, wet clutch C1, wet clutch C2, outer ring gear r1 of the first planetary row, sun gear s1, second The outer ring gear r2 of the planetary row, the sun gear s2, the planetary carrier C shared by the two planetary rows, the main reducer, the differential and other components. The connection relationship between the engine (Engine), the torsional damper, the motor MG1, the motor MG2 and the differential and the double planetary row five-shaft transmission is as follows: the engine (Engine) is connected with the sun gear s1 of the first planetary row, and the first The outer ring gear r1 of one planetary row is connected to the differential, and the motor MG2 is connected to the sun gear s2 of the second planetary row. The outer ring gear r2 of the second planetary row is connected to the sun gear s2 by controlling the closing of the wet clutch C1 The motor MG1 is connected to the planetary carrier C shared by the double planetary row. The planetary carrier C is connected to the sun gear s1 by controlling the closing of the wet clutch C2. The brake B0 can lock the outer ring gear r2 under certain working conditions, and the brake B1 is in the Under certain working conditions, the planet carrier C can be locked, and the outer ring gear r1 of the first planetary row meshes with the planetary gears of the first planetary row and the planetary gears of the second planetary row at the same time. the

How the invention works:

Describe the working method of the scheme through the different working modes of hybrid electric vehicles:

(1) Engine start: When the engine is started, the motor MG1 can be used to start the engine according to different working conditions. At this time, the first planetary gear outer ring gear r1 is connected with the differential, the motor MG1 rotates and outputs torque, and the power passes through the planetary Frame C, the first planetary row sun gear s1 is transmitted to the engine to drive the engine to start; the motor MG2 can also be used to start the engine, at this time the second planetary row outer ring gear r2 is locked by the brake B0, the motor MG2 rotates and outputs torque, and the power passes through The second planetary row sun gear s2, the planetary carrier C, and the first planetary row sun gear s1 are transmitted to the engine to drive the engine to start. Two schemes ensure the reliability of the engine starting process;

(2) Pure electric mode operation: The transmission device can realize pure electric operation of motor MG1, pure electric operation of motor MG2, and combined pure electric operation of dual motors. When the motor MG1 runs purely electric, the engine is turned off and is in a static state due to its own reverse drag torque, the motor MG1 rotates, the power is transmitted to the wheels through the planetary carrier C, the first planetary outer ring gear r1, and the differential, and the motor MG2 idles; When MG2 is running purely electric, the engine is turned off and still, the brake B0 locks the second planetary outer ring gear r2, the motor MG2 rotates, and the power passes through the second planetary sun gear s2, the planetary carrier C, the first planetary outer ring gear r1, and the differential speed The motor MG1 is idling; when the dual motors are combined with pure electric power, the output torque of the motor MG1 and the motor MG2 acts on the first planetary outer ring gear r1 at the same time to drive the wheels to rotate.

(3) Hybrid power mode operation: In the hybrid low-speed mode, the engine starts, the brake B0 locks the second planetary outer ring gear r2, and the power of the engine passes through the first planetary sun gear s1, the planetary carrier C, and the first planetary outer ring gear. The ring gear r1 and the differential are transmitted to the wheels. By adjusting the torque of the motor MG1 and the motor MG2, the speed of the output shaft is increased, and a part of the torque of the engine is transmitted to the motor MG2 to generate electricity and charge the battery, so that the engine works in the ideal area. , to improve system efficiency; in the hybrid high-speed mode, the brake B0 is opened, and the clutches C1 and C2 are locked at the same time, so that the first planetary row sun gear s1, the first planetary row outer ring gear r1, the second planetary row sun gear s2, the second planetary row sun gear The two planetary outer ring gears r2 and the planetary carrier C rotate at the same speed. At this time, the motor MG1 and the motor MG2 are used as auxiliary power to maintain the high-speed operation of the car together with the engine. the

Claims (2)

1. double planet wheel rows of mixing bimodulus hybrid transmissions; Comprise motor, first motor, second motor, planet carrier and differential mechanism; It is characterized in that: be provided with first planet row and second planet row at described planet carrier; Described first planet row's sun gear is connected with described motor, and described first planet row's external toothing is connected with described differential mechanism; Described second planet row's sun gear is connected with described second motor; Second planet row's planet wheel also meshes with the external toothing that described first planet is arranged, and between the sun gear that described second planet row's the external toothing and second planet are arranged, also is provided with one and makes second planet row's external toothing and sun gear closure that second planet is arranged or first wet clutch that breaks off; Described first motor is connected on the described planet carrier; Between described planet carrier and first planet row's sun gear, also be provided with second wet clutch that the sun gear that makes planet carrier and first planet row is closed or break off.

2. double planet wheel rows of mixing bimodulus hybrid transmissions according to claim 1; It is characterized in that: on described planet carrier, also be provided with first break of this planet carrier of locking, on described second planet row, also be provided with second break of the exclusive gear ring of a locking second planet.

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