Composite Double-Ring Transmission for Stepless Ratio Switching
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Solution Overview
Problem
Existing variable transmission devices face challenges in achieving efficient and accurate stepless speed regulation, as mechanical transmissions are efficient but lack speed regulation, hydraulic transmissions are low in efficiency and accuracy, and ring transmissions have limited transmission ratio adjustment ranges.
Innovation Solution
A mechanical-double ring-hydraulic composite transmission device that integrates mechanical, double ring, hydraulic, mechanical-double ring composite, and mechanical-hydraulic composite transmissions, utilizing a convergence mechanism with planetary gear trains, clutch assemblies, and brake assemblies to adjust transmission ratios and switch between modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If mechanical transmissions are used, then transmission efficiency is improved, but speed regulation capability deteriorates
Solution Approach 1:
The patent combines mechanical transmission components (planetary gear trains, clutches) with hydraulic transmission components (variable displacement pump-motor sets) into a composite transmission system. This merging allows the system to achieve both high transmission efficiency through mechanical pathways and continuous speed regulation through hydraulic control, resolving the contradiction between efficiency and speed regulation capability
Solution Approach 2:
The patent employs variable displacement hydraulic pump-motor sets that can dynamically adjust their displacement ratios to achieve continuous speed regulation. The clutch assemblies can dynamically engage or disengage different transmission pathways, allowing the system to adapt its characteristics in real-time to balance efficiency and speed regulation needs
2Adaptability or versatility
If hydraulic transmissions are used, then speed regulation capability is improved, but transmission efficiency deteriorates
Solution Approach 1:
The variable displacement hydraulic pump-motor sets can dynamically adjust their displacement ratios to optimize performance. When continuous speed regulation is needed, the hydraulic pathway is engaged; when high efficiency is prioritized, the system can switch to mechanical transmission pathways, dynamically balancing speed regulation capability and transmission efficiency
Solution Approach 2:
By merging hydraulic transmission components with mechanical transmission components in a composite system, the patent allows the vehicle to utilize the speed regulation advantage of hydraulic transmissions while compensating for efficiency losses through alternative mechanical transmission pathways
3Measurement precision
If ring transmissions are used, then transmission accuracy is improved, but transmission ratio adjustment range deteriorates
Solution Approach 1:
The patent divides the transmission system into multiple planetary gear trains with different gear ratios, each providing precise transmission. By segmenting the overall transmission ratio adjustment into multiple discrete stages, the system maintains high transmission accuracy within each stage while achieving a broader overall adjustment range through combination
Solution Approach 2:
The clutch assemblies enable dynamic switching between different planetary gear train configurations, allowing the system to adaptively select the most appropriate transmission ratio for current driving conditions. This dynamic reconfiguration expands the effective transmission ratio adjustment range while maintaining the high accuracy characteristics of ring transmissions
4Device complexity
If single-mode transmissions are used, then device complexity is reduced, but adaptability to different working conditions deteriorates
Solution Approach 1:
The composite transmission system is designed with multi-functional components that can operate in different modes. The planetary gear trains, clutch assemblies, and hydraulic pump-motor sets can be configured to provide mechanical transmission, hydraulic transmission, or composite transmission, making the system universally adaptable to various working conditions without requiring entirely separate transmission systems for each mode
Solution Approach 2:
By merging multiple transmission modes into a single integrated composite transmission system, the patent achieves adaptability to different working conditions while managing complexity through unified control architecture and shared components across different transmission modes
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 solution enhances the transmission ratio adjustment range, improves accuracy and flexibility, and allows for free switching between various transmission modes, addressing the limitations of single-mode transmissions.
Implementation Method 1
a hydraulic transmission mechanism (4), wherein the hydraulic transmission mechanism (4) comprises a hydraulic pump and a hydraulic motor
Implementation Method 2
the convergence mechanism comprises a left planetary gear train (31) and a right planetary gear train (32)
Data Source
AI summary
A mechanical-double ring-hydraulic composite transmission mechanism includes an input member, a convergence mechanism, a hydraulic transmission mechanism, a double ring mechanism, an output member, a clutch assembly, and a brake assembly. The clutch assembly connects a left planetary gear train to a right planetary gear train. The clutch assembly connects the input member to the hydraulic transmission mechanism, the double ring mechanism, the left planetary gear train, and the right planetary gear train. The clutch assembly connects the hydraulic transmission mechanism to the right planetary gear train. The clutch assembly connects the double ring mechanism to the left planetary gear train. The clutch assembly connects the left planetary gear train and the right planetary gear train to the output member. A continuous transmission ratio between the input member and the output member is provided by adjusting a displacement ratio of the hydraulic transmission mechanism.