Hybrid Drive Apparatus Partition Wall and Planetary Gear Configuration
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Solution Overview
Problem
Current hybrid drive apparatuses face limitations in achieving optimal fuel efficiency, particularly in the high-speed region due to restricted shift speeds and inability to vary engine rotation speed continuously, leading to suboptimal engine operation.
Innovation Solution
A hybrid drive apparatus employing a two-motor split system with a power distributing planetary gear and transmission having multiple shift speeds, including acceleration and deceleration shift speeds, and utilizing a partition wall to separate the motor and transmission parts, allowing for increased engine rotation speed input and efficient power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a transmission with only three shift speeds is used, then the structure is simple, but the top speed can only be realized in a direct coupling state and fuel efficiency in the high speed region cannot be improved further
Solution Approach 1:
The transmission is divided into multiple independent planetary gear sets (first and second planetary gear sets) with distinct functions. The first planetary gear set provides three shift speeds for low and medium speed ranges, while the second planetary gear set provides acceleration and deceleration shift speeds for high speed range, allowing each segment to be optimized for its specific speed range
Solution Approach 2:
The transmission enables dynamic switching between different operational modes by controlling clutch engagement. In the operational state, the power distribution mechanism operates as an electric continuously variable transmission allowing continuous speed variation. In the constant shifting state, it operates as a transmission with fixed speed ratios, providing adaptability across different speed regions
2Speed
If the power distribution mechanism operates as a transmission with constant shifting state, then the rotation speed of the rotary shaft can be increased in relation to the engine rotation speed, but the engine rotation speed cannot be varied continuously and the engine cannot be operated on the optimum fuel efficiency line
Solution Approach 1:
The system dynamically switches between two operational states: (1) operational state where the power distribution mechanism functions as an electric continuously variable transmission enabling continuous engine speed variation for optimal fuel efficiency, and (2) constant shifting state where it operates as a fixed-ratio transmission for high-speed efficiency. This dynamic adaptability resolves the contradiction between fixed speed ratio and continuous speed variation
Solution Approach 2:
The power distribution mechanism serves multiple functions: it can operate as both a continuously variable transmission (enabling continuous speed variation) and as a fixed-ratio transmission (enabling increased rotation speed). The same mechanical structure adapts to different operational requirements through clutch control, providing universal functionality across different driving conditions
3Use of energy by moving object
If a two-motor split system is employed, then continuous speed variation is enabled and fuel efficiency is improved, but the acceleration performance in low speed region may be compromised
Solution Approach 1:
The transmission is segmented into different speed range specialists: the first planetary gear set handles low and medium speed ranges with three shift speeds optimized for acceleration, while the second planetary gear set handles high speed ranges with acceleration and deceleration shift speeds. This segmentation allows each segment to be optimized for its specific function without compromising overall performance
Solution Approach 2:
The system changes operational parameters by switching between different clutch engagement states. In low speed region, the transmission engages specific clutches to provide favorable acceleration performance. In high speed region, different clutches are engaged to enable continuous speed variation and optimize fuel efficiency. The parameter changes allow the system to adapt to different performance requirements
Data Source
AI summary
A hybrid drive apparatus including an input shaft; a first motor and a second motor; a power distributing planetary gear; an intermediate transmission shaft; and a partition wall provided between a motor part including the first motor and the second motor and a transmission part including the transmission such that the intermediate shaft passes through the partition wall.