Hybrid Drive Transmission Layout for Compact Multi-Ratio Gearing
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Solution Overview
Problem
Conventional hybrid drive systems with planetary transmissions and spur gear sections are complex and require significant axial space, limiting their compactness and functional efficiency.
Innovation Solution
A hybrid drive system with a four-shaft planetary transmission, two spur gear sections, and a blocking switch element, allowing for a compact structure and flexible gear ratios, enabling the electric engine to operate in reverse and optimizing the use of both internal combustion and electric engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional hybrid drive systems with planetary transmissions and spur gear sections are used, then multiple transmission functions are implemented, but the structure becomes complex and requires large axial space
Solution Approach 1:
The patent merges the planetary transmission and spur gear sections into a unified four-shaft planetary transmission system where the planetary carriers of two planetary gear sets are permanently connected and serve as input shafts for integrated spur gear sections, reducing structural complexity while maintaining multiple transmission functions
Solution Approach 2:
The four-shaft planetary transmission system provides multi-functionality by enabling various gear ratios through different combinations of shafts and incorporating a blocking switch element that can connect any two of the four shafts, allowing the same structure to perform multiple transmission functions with high adaptability
2Adaptability or versatility
If conventional hybrid drive systems with planetary transmissions and spur gear sections are used, then multiple transmission functions are implemented, but the axial space requirement increases
Solution Approach 1:
The patent applies nesting by integrating spur gear sections directly within the planetary transmission structure, where spur gear input shafts are permanently connected to planetary carriers, allowing compact arrangement that reduces axial space while maintaining multiple gear functions
Solution Approach 2:
The patent rearranges the transmission architecture from conventional sequential layouts to a four-shaft planetary system with integrated spur gears, utilizing radial and axial space more efficiently through dimensional optimization, achieving compactness without sacrificing transmission function versatility
3Adaptability or versatility
If the transmission ratio of one spur gear section is made much greater than the other, then gear ratio flexibility is improved, but the structure becomes more complex
Solution Approach 1:
The patent introduces a blocking switch element that can dynamically connect any two of the four shafts in different operational modes, enabling the system to adaptively achieve various gear ratios including extreme ratio differences without requiring complex fixed structural designs for each ratio scenario
Data Source
AI summary
A hybrid drive system has an internal combustion engine, electric engine, and transmission having a first spur gear section and a second spur gear section, which provide output via at least one layshaft, and a four-shaft planetary transmission, which has a first planetary gear set having a first sun gear, a first planetary carrier and a first annular gear, and a second planetary gear set having a second sun gear, a second planetary carrier and a second annular gear. The first annular gear is couplable with a crankshaft of the internal combustion engine. The first sun gear is permanently connected to the second annular gear fixed against rotation. A rotor of the electric engine is couplable with the second annular gear fixed against rotation. The first planetary carrier is permanently connected to the second planetary carrier fixed against rotation. A first input shaft of the first spur gear section rotatable around a main axis of rotation is connected to the second planetary carrier fixed against rotation.