Stepless variable drive system for series dual-motor differential power dividing

Abstract

The invention discloses a stepless variable drive system for series dual-motor differential power dividing. The system comprises an engine output/differential input shaft, a first motor, a second motor, a motor controller, a power dividing device, a clutch, a gearbox, an engine power output shaft and a storage battery; the first motor and the second motor are connected in series, power of an engine is transmitted to the first motor through the engine output/differential input shaft for power generation, and meanwhile, the engine output/differential input shaft outputs power outwards through the power dividing device, the clutch and the gearbox to form a first power path; the first motor supplies power to the second motor and the storage battery through the motor controller, and the secondmotor outputs power outwards through the power dividing device, the clutch and the gearbox to form a second power path. The stepless variable drive system has the two power paths of mechanical power and electric power.

Description

technical field [0001] The invention relates to a continuously variable transmission system, in particular to a continuously variable transmission system (EMCVT) with dual motors in series and differential power splitting. Background technique [0002] Existing transmission systems (taking tractors as an example) are divided into manual shift transmission systems, power uninterrupted automatic shift transmission systems, and hydraulic-mechanical continuously variable transmission systems (HMCVT) according to shifting methods. [0003] 1. Manual shift transmission system: [0004] When the tractor is working in the field, due to the large change of the land resistance and the large change of the load of the whole machine, the tractor with the manual transmission transmission system needs to stop and change gears frequently to meet the traction force and speed requirements of the farm implements. The quality is unstable; at the same time, the engine speed is directly related ...

AI Technical Summary

Problems solved by technology

[0013] (1) Tractors with manual shifting transmission systems need to stop and shift frequently to meet the traction and speed requirements of farm implements. The work intensity of employees is high, the work efficiency is low, and the work quality is unstable.

[0014] (2) The engine speed is directly related to the vehicle speed. The change of vehicle speed leads to a wide range of engine speed changes. The engine cannot work in a stable and economical speed range, resulting in high fuel consumption, poor emissions, and large vibration wear.

[0016] (1) The engine speed of the transmission system is directly related to the vehicle speed. Vehicle speed changes lead to a large range of engine speed changes, and the engine cannot work in a stable and economical speed range, resulting in high fuel consumption, poor emissions, and large vibration wear

[0017] (2) The transmission system structure requires a large number of clutches and proportional valves. With the increase of use time, the clutch wear increases, the shift control time changes, the ride comfort becomes poor, and shift shock occurs

[0018] (3) The traditional power shift gearbox is a single-power route with a staged transmission. To achieve a super crawling gear (ultra-low speed), a lot of complicated reduction gear trains need to be added

Moreover, stepless transmission cannot be realized during major operations such as rotary tillage, that is, it cannot match the optimal driving speed of the rotary tiller in theory.

[0019] (4) At present, the technologies of these systems are basically mastered by foreign companies and mainly rely on imports. The price of the transmission system is high, it is difficult to reduce the price, and the maintenance cost is high

[0021] (1) The mechanical transmission system consisting of 4-6 gears is a transmission mechanism composed of a multi-row differential mechanism and 4-6 wet clutches or brakes. The structure is complex, the parts processing requirements are high, and the cost is high.

[0022] (2) The hydraulic power distribution system composed of hydraulic precision couplings has very high requirements for assembly cleanliness, use cleanliness, and maintenance cleanliness, and requires special hydraulic oil, which is expensive to use and maintain

[0023] (3) Since the technologies of these systems are basically mastered by foreign companies, the products mainly rely on imports, which are costly and difficult to reduce prices

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