Vehicle Base Structure for Stable Suspension Member Bending
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Solution Overview
Problem
Existing vehicle base structures face challenges in stabilizing the bending mode of suspension members during collisions, particularly due to the difficulty in achieving stable downward convex bending of the suspension member when supporting a driving motor, which can lead to instability and the need for additional reinforcing members.
Innovation Solution
A vehicle base structure design that includes a front-side mount portion supporting the motor unit's front portion on the vehicle's downward side from its center of gravity and a rear-side mount portion on the upward side, with the center of gravity interposed between, utilizing the motor's rotational force to promote stable downward convex bending, and utilizing a cast member integrally molded by die casting to support the rear-side mount portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the motor unit is supported by the suspension member, then the motor unit is stably supported, but the suspension member cannot stably bend toward the vehicle lower side during collision
Solution Approach 1:
The patent positions the front-side mount portion on the vehicle lower side from the motor unit's center of gravity and the rear-side mount portion on the vehicle upper side, creating a vertical dimension offset. This dimensional arrangement enables the motor unit to rotate about its center of gravity during collision, generating the desired downward convex bending of the suspension member toward the vehicle lower side.
Solution Approach 2:
The mount portions are pre-positioned at specific locations relative to the motor unit's center of gravity before collision occurs. The front-side mount portion is disposed on the vehicle lower side and the rear-side mount portion on the vehicle upper side, establishing the geometric conditions necessary for the motor unit to naturally rotate and induce stable bending during impact.
2Reliability
If additional reinforcing members are added to control bending mode, then bending stability is improved, but vehicle weight increases
Solution Approach 1:
The motor unit itself serves the dual function of being supported by the suspension member and acting as the source of rotational force during collision. By positioning the mount portions asymmetrically relative to the motor unit's center of gravity, the motor unit's own mass and inertia are utilized to generate the desired bending moment, eliminating the need for separate reinforcing members.
Solution Approach 2:
The motor unit is given multiple functions: it is both the loaded component (supported by the suspension member) and the active component (generating rotational force during collision through its position relative to the mount portions). This multi-functionality eliminates the need for additional dedicated components for bending control.
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
This design stabilizes the bending mode of the suspension member during collisions, reduces the need for additional reinforcing members, and minimizes weight by concentrating impact loads, thereby enhancing structural stability and reducing overall weight.
Implementation Method 1
moment toward the vehicle downward side and also a vehicle rearward side acts on the motor unit, about the center of gravity
Implementation Method 2
when an impact load is input to the suspension member at the time of a front collision of the vehicle, the impact load is transmitted to the motor unit side
Implementation Method 3
a cast member integrally molded by die casting
Data Source
AI summary
On the front side of the motor unit mounted on the suspension member, a front-side mount portion for supporting the front portion of the motor unit is provided on the vehicle lower side relative to the center of gravity G of the motor unit. Further, the rear side of the motor unit, the rear-side mount portion for supporting the rear portion of the motor unit on the left and right of the opposite side and upper side of the front-side mount portion between the center of gravity G of the motor unit is provided, respectively.