Hydro-Mechanical Hybrid Transmission for Stepless Reverse Speed Range
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Solution Overview
Problem
Existing multi-functional hydro-mechanical transmission devices fail to adequately address the adaptability of reverse gears to various working conditions, limiting their efficiency in stepless speed regulation across the entire speed range.
Innovation Solution
A multi-mode hydro-mechanical hybrid transmission device that switches among mechanical, hydraulic, and hydro-mechanical transmission modes through the combination and engagement/disengagement of clutches and brakes, featuring a complex gear train system with multiple clutches and brakes to adjust transmission ratios and provide continuous speed variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydro-mechanical hybrid transmission is used for stepless speed regulation, then forward speed regulation efficiency is improved, but reverse gear adaptability to various working conditions deteriorates
Solution Approach 1:
The transmission device is divided into multiple independent gear trains (first gear train with planetary gear mechanism, second gear train with differential mechanism, third gear train with worm gear mechanism), each capable of providing different transmission ratios. This segmentation allows the system to select appropriate gear trains for forward and reverse operations, improving reverse gear adaptability while maintaining stepless speed regulation capability through hydraulic transmission.
2Reliability
If multiple clutches and brakes are added to achieve multi-mode transmission, then fault tolerance and adjustment freedom are improved, but device complexity increases
Solution Approach 1:
The clutches and brakes are designed to serve multiple functions simultaneously. For example, the first clutch not only engages the first gear train for forward transmission but also participates in hydro-mechanical hybrid transmission modes. The second brake serves both as a reverse braking mechanism and a safety lock. This multi-functionality reduces the number of additional components needed while achieving improved fault tolerance and adjustment freedom.
Solution Approach 2:
The patent combines mechanical transmission elements (gear trains, clutches, brakes) with hydraulic transmission elements (variable displacement pump, hydraulic motor) into an integrated hydro-mechanical hybrid system. This merging allows the system to achieve multi-mode transmission (mechanical mode, hydraulic mode, hydro-mechanical hybrid mode) without proportionally increasing complexity, as the components work synergistically rather than additively.
3Adaptability or versatility
If mechanical transmission mechanism is added for reverse gears, then reverse speed regulation adaptability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs nested planetary gear mechanisms where planet gears are positioned within annular gears, and sun gears are positioned within planet gear assemblies. This nested structure allows multiple gear trains to be compactly arranged within the transmission housing, reducing overall device volume and simplifying manufacturing compared to separate, distributed gear mechanisms. The nested design also facilitates standardized component production and assembly.
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 enhances fault tolerance, increases adjustment freedom, and expands both forward and reverse speed regulation ranges, enabling seamless gear shifts without power interruption and achieving stepless speed regulation.
Implementation Method 1
hydro-mechanical hybrid transmission for efficient stepless speed regulation
Data Source
AI summary
A multi-mode hydro-mechanical hybrid transmission device includes an input member, a hydraulic transmission mechanism, a mechanical transmission mechanism, a convergence mechanism, an output member, a clutch assembly, and a brake assembly. The clutch assembly connects an output end of the input member to an input end of the hydraulic transmission mechanism, the mechanical transmission mechanism, and the convergence mechanism. The clutch assembly connects an output end of the hydraulic transmission mechanism to the convergence mechanism. The clutch assembly connects the mechanical transmission mechanism to the convergence mechanism. The convergence mechanism is connected to the output member. Continuously changing transmission ratios are provided between the input member and the output member by adjusting a displacement ratio of the hydraulic transmission mechanism and selectively controlling engagement of the clutch assembly and the brake assembly.