Vehicle Driving Device Mounting for Torque Stability
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Solution Overview
Problem
Existing vehicles with batteries mounted below the interior face challenges in efficiently transmitting torque to the rear wheels and protecting the driving device unit during collisions, as the center of gravity positioning affects stability and rotation control.
Innovation Solution
The vehicle design increases load on the rear wheels by positioning the front mounting portion higher than the rear mounting portion, stabilizing torque transmission and suppressing the rotation of the driving device unit during collisions by ensuring the center of gravity of the driving device unit is behind the rear wheel axle, with imaginary lines intersecting below the wheel upper ends to enhance load distribution and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the battery is mounted below the vehicle interior with the center of gravity near the center, then the vehicle behavior is stabilized and center of gravity is lowered, but the torque transmission efficiency to the rear axle is insufficient
Solution Approach 1:
The patent repositions the driving device unit's center of gravity from the conventional horizontal alignment with the rear axle to a position in a different spatial dimension - specifically, above the rear axle in the vertical direction. This dimensional change allows the torque transmission path to pass through the rear wheel assembly, improving efficiency while the battery's central positioning maintains overall vehicle stability.
2Device complexity
If the driving device unit is mounted with center of gravity near the rear axle, then the structure is simplified, but the driving device unit rotates during collision and cannot protect the battery
Solution Approach 1:
The patent applies preliminary anti-action by positioning the driving device unit's center of gravity above the rear axle, creating a predetermined geometric relationship that produces counteracting moments during collision. This pre-configured positioning ensures that when collision occurs, the rotational forces are naturally countered, protecting the battery without requiring additional active control systems.
Solution Approach 2:
The patent creates a composite structural system combining the driving device unit, mounting brackets, and vehicle frame into an integrated assembly with a specifically designed center of gravity position. This composite structure functions as a unified anti-rotation mechanism during collision, where the relative positioning of components creates stabilizing moments that protect the battery.
3Ease of manufacture
If the mounting structure is designed with front and rear mounting portions at the same height, then the installation is simplified, but the rear wheel load is insufficient affecting acceleration performance
Solution Approach 1:
The patent introduces asymmetry in the mounting structure by positioning the front mounting portion higher than the rear mounting portion. This asymmetric configuration creates a downward component of force on the rear wheel, increasing the normal load and improving traction for acceleration. The asymmetric design is integrated into the mounting brackets and frame structure, maintaining manufacturability while achieving the desired performance.
Data Source
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AI summary
A vehicle includes: a battery provided below a vehicle interior with a floor panel therebetween; and a driving device unit supported by a vehicle frame member via a front portion and a rear portion. A center of gravity of the battery is positioned forward compared to a rear wheel axle that connects the left rear wheel with the right rear wheel, a center of gravity of the driving device unit is positioned rearward compared to the rear wheel axle, the front portion is positioned forward compared to the rear wheel axle, the rear portion is positioned rearward compared to the rear wheel axle, the front portion is positioned above the rear portion, and a first imaginary line and a second imaginary line pass above the rear wheel axle and below wheel upper end portions of the left rear wheel and the right rear wheel in a side view.