Multi-Mode Hydro-Mechanical Transmission with Stepless Speed Control
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Solution Overview
Problem
Existing variable-speed transmission devices fail to fully satisfy design requirements for multiple modes, especially multiple hybrid modes, in various working conditions, as they primarily focus on single-flow transmission and hybrid transmission designs, lacking the ability to efficiently switch between different transmission modes.
Innovation Solution
A gear-hydraulic-metal belt integrated multi-mode hydro-mechanical hybrid transmission device that includes an input assembly, output assembly, metal belt transmission mechanism, planetary gear assembly, hydraulic transmission mechanism, clutch assembly, and brake assembly, allowing for switching between hydraulic transmission, gear transmission, metal belt transmission, and hybrid transmission modes through the engagement/disengagement of clutches and brakes, enabling stepless speed regulation and large-range, high-precision speed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If single-flow transmission or two-type hybrid transmission is designed, then the structure is relatively simple, but it fails to satisfy design requirements for multiple modes in multiple working conditions
Solution Approach 1:
The transmission device is segmented into three independent single-flow transmission mechanisms (gear transmission mechanism, metal belt transmission mechanism, and hydraulic transmission mechanism), each capable of functioning independently. This segmentation allows any combination of these mechanisms to be engaged or disengaged through clutch assemblies, enabling six different transmission modes while maintaining relatively simple individual mechanism structures.
Solution Approach 2:
The three single-flow transmission mechanisms are designed with universal interfaces and connection points that allow them to work in various combinations. The clutch assemblies provide universal control capability to engage or disengage any mechanism, making the same hardware configuration support multiple transmission modes including pure gear, pure metal belt, pure hydraulic, and various hybrid combinations.
2Loss of energy
If gear transmission is used, then transmission efficiency is high, but power interruption occurs
Solution Approach 1:
The gear transmission mechanism is merged with other transmission mechanisms (metal belt or hydraulic) through the clutch assemblies. When power interruption is a concern, the system can switch to metal belt transmission or hydraulic transmission, or operate in hybrid mode where the gear mechanism works in conjunction with continuous-power transmission mechanisms, thereby maintaining both high efficiency and power continuity.
3Reliability
If hydraulic transmission is used, then high torque is provided without power interruption, but transmission efficiency is low
Solution Approach 1:
The hydraulic transmission mechanism is merged with gear transmission or metal belt transmission through clutch assemblies. In hybrid modes, the hydraulic mechanism provides power continuity and high torque while the gear or metal belt mechanism compensates for efficiency losses, achieving a balance between reliability and energy efficiency.
4Loss of energy
If metal belt transmission is used, then transmission efficiency is high, but transmission ratio range is limited
Solution Approach 1:
The metal belt transmission mechanism is segmented as one of three independent transmission paths. When a wide transmission ratio range is required, the system can switch to gear transmission mechanism which provides broader ratio coverage, or operate in hybrid mode where metal belt and gear mechanisms work together to extend the effective transmission ratio range while maintaining high efficiency.
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
The device achieves high-efficiency stepless speed variation and large-range, high-precision speed regulation by switching between multiple transmission modes, meeting the requirements of different working conditions and providing multiple choices for energy management.
Implementation Method 1
hydraulic transmission mechanism, hydraulic transmission can provide high torque without power interruption
Implementation Method 2
metal belt transmission mechanism, metal belt transmission has high transmission efficiency
Implementation Method 3
planetary gear assembly, gear transmission causes power interruption, but has high transmission efficiency
Data Source
AI summary
A gear-hydraulic-metal belt integrated multi-mode hydro-mechanical hybrid transmission device includes an input assembly, an output assembly, a metal belt transmission mechanism, a planetary gear assembly, a hydraulic transmission mechanism, a clutch assembly and a brake assembly. The input assembly is connected to the metal belt transmission mechanism, the planetary gear assembly and the hydraulic transmission mechanism. The metal belt transmission mechanism and the hydraulic transmission mechanism are connected to the planetary gear assembly. The planetary gear assembly is connected to the output assembly. The clutch assembly connects the input assembly to the metal belt transmission mechanism and the planetary gear assembly, and connects each of the metal belt transmission mechanism and the hydraulic transmission mechanism to the planetary gear assembly. The clutch assembly and the brake assembly provide a continuous transmission ratio between the input assembly and the output assembly.