Hybrid power transmission device of dual-mode two-stage planet wheel

Abstract

The invention discloses a hybrid power transmission device of a dual-mode two-stage planet wheel. The hybrid power transmission device 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, the first planet row comprises a first-stage planet wheel and a second-stage planet wheel, the second planet row also comprises the first-stage planet wheel and the second-stage planet wheel, an outer gear ring of the first planet row is connected with the engine, the second motor is connected with a sun wheel of the first planet row, and the outer gear ring of the second planet row is connected with the differential; and the first motor is connected with the planet carrier, and the planet carrier is connected with the outer gear ring of the first planet row by closing a second wet type clutch. The hybrid power transmission device of the dual-mode two-stage planet wheel can realize a variety of working modes, reduce the requirements on the rotational speed and the torque of the motors and reduce the technical requirements on the motors, and the direct effect is that the difficulty in processing and manufacturing of the motors is reduced.

Description

technical field [0001] The invention relates to a hybrid power transmission device, in particular to a transmission device adopting planetary gear transmission. technical background [0002] 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 an...

AI Technical Summary

Problems solved by technology

[0012]The two motors are arranged on both sides of the planetary row. 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 the temperature rises, 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 set of cooling system, MG1 and MG2 are arranged on both sides of the planetary row, the heat dissipation system is more complicated, and the integration level is low, resulting in increased cost and low reliability

[0013]2. The reduction ratio of the single row planetary gear train is too low, which affects the system

[0016](b) The hybrid system requires too much space arrangement;

[0017] In order to achieve a sufficient reduction ratio, the transmission gear reduction system has too high requirements for space layout. The reduction device adopts multi-stage transmission components including chain transmission, further increasing the system complexity

[0018]3. The locking function of motor MG1 is missing, and its working efficiency drops significantly under certain working conditions;

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 still a certain hysteresis, which increases the difficulty of control

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