Electric Drive Speed Shifting Clutch for Compact Torque Vectoring
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Solution Overview
Problem
Conventional electric driving apparatuses for vehicles are complex and bulky due to their use of planetary gears for speed reduction and torque vectoring, making them large, difficult to manufacture, and costly.
Innovation Solution
A simplified electric driving apparatus with a two-stage speed reduction and torque vectoring function, utilizing a speed shifting structure with an input gear, speed shifting shaft, output gear, and a clutch unit that includes a piston, clutch plate package, and force transmitting member to achieve selective rotational engagement, reducing the number of parts and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If planetary gears are used for speed reduction and torque vectoring, then speed reduction function and torque vectoring function are achieved, but device size becomes large and structure becomes complicated
Solution Approach 1:
The transmission system is divided into multiple independent gear sets (first gear set with first sun gear, first planet gears, first ring gear; second gear set with second sun gear, second planet gears, second ring gear). Each gear set can operate independently to provide different transmission ratios, eliminating the need for complex planetary gear mechanisms while achieving both speed reduction and torque vectoring functions.
Solution Approach 2:
The gear sets are designed to perform multiple functions: the first gear set provides first transmission ratio for speed reduction, the second gear set provides second transmission ratio for torque vectoring. Each gear set can independently achieve both speed reduction and torque distribution, making the system more versatile and less complex than traditional planetary gear systems.
2Adaptability or versatility
If planetary gears are used for speed reduction and torque vectoring, then speed reduction function and torque vectoring function are achieved, but device size becomes large
Solution Approach 1:
The transmission system is divided into multiple independent gear sets (first gear set with first sun gear, first planet gears, first ring gear; second gear set with second sun gear, second planet gears, second ring gear). Each gear set can operate independently to provide different transmission ratios, eliminating the need for complex planetary gear mechanisms while achieving both speed reduction and torque vectoring functions.
Solution Approach 2:
The patent arranges gear sets in a multi-dimensional layout with first and second transmission shafts positioned at different spatial locations. The first and second gear sets are distributed across different dimensions rather than being concentrated in a single planetary gear assembly, which reduces the overall device footprint while maintaining functional complexity.
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 solution simplifies the structure, reduces the number of parts, and enhances manufacturing ease while maintaining efficiency in speed reduction and torque vectoring, leading to a more compact and cost-effective electric driving apparatus.
Implementation Method 1
a piston configured to move along the rotation axis by hydraulic pressure
Data Source
AI summary
An electric driving apparatus includes: a housing; an electric machine comprising a motor shaft rotatably supported by the housing; a speed shifting unit for reducing a rotation speed of a rotational driving force of the motor shaft; and a double clutch unit configured to selectively rotationally drive a pair of output shafts by receiving rotational driving force of the speed shifting unit. The speed shifting unit includes: an input gear receiving the rotational driving force of the motor shaft; a speed shifting shaft rotatably supported by the housing; an output gear provided on the speed shifting shaft to rotate together with the speed shifting shaft; and a clutch unit operative to selectively achieve a rotationally constrained engagement between the input gear and the speed shifting shaft.