Compound Transmission Merging Differential Gear and CVT
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Solution Overview
Problem
Current transmissions, particularly automatic and continuously variable transmissions, face limitations in providing smooth torque at low speeds and high speeds, leading to inefficiencies and limitations in power transmission, especially for large vehicles and applications requiring varying torque and rpm, such as excavators and underwater pumps.
Innovation Solution
A compound transmission system combining a differential gear and a continuously variable transmission, which includes a transmission housing, main and auxiliary shafts, transmission gear units, differential gear units, and sleeve units, allowing for gear mode and continuously variable transmission mode shifting to optimize torque and rpm according to speed requirements, and featuring a reverse gear set and rotary sink gear set for enhanced shifting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a continuously variable transmission (CVT) is used to achieve smooth rpm variation and improved fuel efficiency, then fuel efficiency is improved, but the transmission cannot transmit large force at low speeds
Solution Approach 1:
The patent combines a differential gear mechanism with a continuously variable transmission (CVT) into a compound transmission system. The differential gear handles low-speed high-torque requirements while the CVT provides continuous ratio variation for fuel efficiency, allowing both functions to coexist in a single integrated system that resolves the contradiction between fuel efficiency and low-speed force transmission capability
2Ease of operation
If an automatic transmission is used to enable automatic gear shifting, then ease of operation is improved, but the structure becomes complicated and fuel consumption increases
Solution Approach 1:
The differential gear mechanism in the compound transmission serves multiple functions: it provides gear ratio changes, enables automatic torque distribution, and maintains rotational motion during transitions. This multi-functionality reduces the need for separate control mechanisms, simplifying the overall structure compared to conventional automatic transmissions while maintaining ease of operation
3Adaptability or versatility
If a differential gear is used to enable rotational motion and torque distribution, then adaptability is improved, but the structure becomes more complex
Solution Approach 1:
The patent integrates the differential gear mechanism directly with the CVT components, merging two separate transmission systems into a unified structure. The differential gear's rotational freedom and torque distribution capabilities are combined with the CVT's continuous ratio variation, allowing adaptability functions to be achieved through the integrated design rather than adding separate complex subsystems
Data Source
AI summary
The present invention relates to a transmission for a vehicle, and more particularly, to a compound transmission of combining a differential gear and a continuously variable transmission, which transmits power through the differential gear and a transmission gear at a low speed and transmits the power through the continuously variable transmission and the differential gear at a high speed.According to the present invention, the shifting is performed through the differential gear unit at a low stage requiring large torque and low rpm and performs the shifting through the continuously variable transmission at a high stage requiring relatively small torque and high rpm to provide optimum shifting efficiency by collecting only advantageous of the respective units.