Motor Case Rib Structure for Vehicle Collision Resistance
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Solution Overview
Problem
Conventional driving apparatus cases in vehicles are vulnerable to damage during collisions due to insufficient structural strength, particularly when a side member or external structure interferes with the case housing the motor.
Innovation Solution
The case is reinforced with radial ribs and a connecting rib that extend in the vehicle width direction, allowing stress from collisions to be distributed to high-strength areas, reducing damage and enhancing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the case structure is simplified without reinforcement, then manufacturing cost and complexity are reduced, but collision resistance and structural strength deteriorate
Solution Approach 1:
The case structure implements local quality enhancement by adding radial ribs and connecting ribs specifically in the first region that overlaps with the side member, while other regions maintain simpler structure. This targeted reinforcement improves collision resistance at critical areas without unnecessarily increasing overall structural complexity
Solution Approach 2:
The case is segmented into multiple regions based on collision risk, with the first region (overlapping side member) receiving enhanced reinforcement through radial ribs and connecting ribs, while other regions maintain baseline structure. This segmentation allows strength improvement where needed while controlling overall complexity
2Strength
If additional protective covers are added to the case, then collision resistance improves, but manufacturing cost and device complexity increase
Solution Approach 1:
The protective function is merged into the case structure itself through integrated radial ribs and connecting ribs, eliminating the need for separate protective covers. This consolidation maintains collision resistance while reducing manufacturing cost and simplifying the overall structure
Solution Approach 2:
The protective cover function is extracted and integrated directly into the case body through the rib structure, removing the need for additional separate components. This extraction reduces part count and manufacturing complexity while maintaining protective functionality
Data Source
AI summary
A driving apparatus of the present disclosure includes an electric motor including a stator and a rotor, a case accommodating the electric motor and mounted on a vehicle so as to partially overlap a side member as viewed from a vehicle width direction, a drive shaft connected to a wheel, a plurality of radial ribs respectively projecting in the vehicle width direction and extending radially, and a connecting rib projecting in the vehicle width direction and joining with center side ends of the plurality of radial ribs. At least part of the plurality of radial ribs reach a first region of the case that overlaps the side member and does not overlap with the wheel as viewed from the vehicle width direction. The driving apparatus improves strength of the case that accommodates the electric motor and is mounted on the vehicle.