Multi-mode CVT with Speed and Torque Coupling for Agricultural Load Adaptation
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Solution Overview
Problem
Agricultural machinery faces inefficiencies due to extreme operating conditions, leading to increased fuel consumption and high costs, as existing transmission systems fail to optimize power matching and adapt to varying load conditions effectively.
Innovation Solution
A multi-mode continuously variable transmission system with both speed coupling and torque coupling, incorporating a planetary gear assembly, hydraulic transmission, clutch, and brake assemblies, allowing for adjustable displacement ratios and selective engagement of clutches and brakes to provide various transmission modes (hydraulic, mechanical, and hydro-mechanical) for optimal power matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single power source (engine or motor) is used in traditional transmission systems, then the structure is simple, but the system cannot adapt to varying load conditions and achieve optimal power matching, leading to increased fuel consumption
Solution Approach 1:
The patent combines engine and motor power sources into a hybrid power system where both can operate simultaneously or independently. The engine and motor are merged through a planetary gear assembly that allows power from either source to be transmitted to the output, enabling flexible power matching for different load conditions while maintaining a integrated transmission structure.
Solution Approach 2:
The transmission system is designed to perform multiple functions: it can operate in engine-only mode, motor-only mode, or hybrid mode depending on load requirements. The planetary gear assembly serves as a universal power transmission mechanism that handles power from different sources, making the system adaptable to various operating conditions without requiring separate transmission systems.
2Power
If high-power agricultural machinery is used to overcome extreme operating conditions, then the power output is sufficient, but the cost and size increase significantly
Solution Approach 1:
The system dynamically switches between different power sources and transmission modes based on real-time load conditions. During low-load operations, only the engine or motor operates, reducing power output to match actual needs. During high-load extreme conditions, both engine and motor operate together to provide maximum power, eliminating the need for a permanently oversized power system.
Solution Approach 2:
The transmission ratio is continuously variable through the planetary gear assembly, allowing the system to optimize the relationship between input power and output torque. By changing transmission parameters dynamically, the system can extract maximum efficiency from smaller power sources while still delivering high torque when needed, reducing overall system size and cost.
3Device complexity
If low-power agricultural machinery is used to reduce cost and size, then the machinery is more affordable, but it must sacrifice operating efficiency to overcome extreme conditions
Solution Approach 1:
The system prepares for extreme conditions by having a motor ready to provide supplemental power when needed. The motor can be engaged quickly to assist the engine during sudden high-load situations, allowing the base engine size to be smaller while still maintaining the capability to handle extreme operating conditions efficiently.
4Use of energy by moving object
If traditional fixed-ratio transmission is used, then the structure is simple, but the system cannot optimize power matching under different operating conditions, leading to fuel consumption increase
Solution Approach 1:
The transmission system uses a planetary gear assembly that enables continuous variation of transmission ratio, replacing fixed-ratio gears with a dynamic, adjustable mechanism. This allows the transmission ratio to be optimized in real-time based on operating conditions, maximizing energy efficiency while the clutch and brake assemblies dynamically adjust power flow paths.
Solution Approach 2:
The system incorporates control mechanisms that monitor operating conditions and adjust the transmission ratio and power source selection accordingly. Based on feedback from load sensors and operating parameters, the system automatically selects the most efficient operating mode (engine-only, motor-only, or hybrid) and optimizes the transmission ratio to minimize fuel consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system enables continuous adjustment of transmission ratios, improving efficiency and reducing fuel consumption by combining engine and motor power sources, meeting high-torque requirements, and switching between transmission modes to optimize power and fuel economy.
Implementation Method 1
a hydraulic transmission assembly, wherein the planetary gear assembly includes five planetary gear trains
Implementation Method 2
the planetary gear assembly includes a first planetary gear mechanism, a second planetary gear mechanism, a third planetary gear mechanism, a fourth planetary gear mechanism, and a fifth planetary gear mechanism
Implementation Method 3
the clutch assembly connects the engine-power input assembly, the hydraulic transmission assembly, and the motor transmission assembly to an input end of the planetary gear assembly
Implementation Method 4
the clutch assembly and the brake assembly provide a continuously changing transmission ratio between the engine-power input assembly or/and the motor transmission assembly and the output member
Data Source
AI summary
A multi-mode continuously variable transmission with both speed coupling and torque coupling includes an engine-power input assembly, a hydraulic transmission assembly, a motor transmission assembly, a planetary gear assembly, an output member, a clutch assembly, and a brake assembly, wherein an output end of the planetary gear assembly is connected to the output member, the clutch assembly connects the engine-power input assembly, the hydraulic transmission assembly, and the motor transmission assembly to an input end of the planetary gear assembly, and the clutch assembly connects the engine-power input assembly to the hydraulic transmission assembly; and the clutch assembly and the brake assembly provide a continuously changing transmission ratio between the engine-power input assembly or/and the motor transmission assembly and the output member.