Integrated EV Drive Unit Casing for Side-Collision Protection
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Solution Overview
Problem
Existing electric vehicles with separate casings for drive and electric-power control units are prone to damage during collisions, risking exposure of high-voltage components due to lack of energy absorption mechanisms, especially when integrated into a single casing.
Innovation Solution
The electric vehicle integrates the drive apparatus and electric-power control apparatus in a single casing with vertically separated upper and lower spaces, using a thicker fastener-attached portion and locating the fragile side member overlap to absorb collision energy, enhancing the casing's strength and preventing exposure of high-voltage components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the drive apparatus and electric-power control apparatus are housed in separate casings, then the electric-power control apparatus can be positioned higher to simplify assembly, but the casing housing the electric-power control apparatus may be pressed by a bent or broken side member during collision, causing damage and potential electric leakage
Solution Approach 1:
The patent merges the drive apparatus and electric-power control apparatus into a single integrated casing, eliminating the separate casings arrangement. This integration ensures that both apparatuses are protected together as one unit, preventing the electric-power control apparatus from being exposed to external pressing forces during collision while maintaining assembly simplicity.
Solution Approach 2:
The patent positions the electric-power control apparatus in the upper space and the drive apparatus in the lower space within the same casing, utilizing vertical spatial separation. This dimensional arrangement allows the casing to absorb collision energy through its integrated structure while protecting both apparatuses, resolving the contradiction between assembly ease and collision protection.
2Device complexity
If the drive apparatus and electric-power control apparatus are housed in the same casing with the electric-power control apparatus in the upper space, then the shape of the drive unit is simplified, but there is no portion for absorbing energy of the bent or broken side member pressing the casing in the upper space, causing the casing to be damaged
Solution Approach 1:
The patent combines the upper and lower spaces into a single integrated casing structure, allowing the entire casing to function as an energy-absorbing unit. This merging ensures that the simplified shape does not compromise strength, as the integrated casing can distribute and absorb pressing forces from bent or broken side members throughout its structure.
Solution Approach 2:
The patent employs a casing structure with varying wall thicknesses, creating a composite structural design. The thick portion is strategically positioned to absorb energy from pressing forces, while maintaining the overall simplified shape of the drive unit. This composite approach resolves the contradiction between shape simplicity and pressing force resistance.
3Strength
If the casing wall thickness is increased to prevent damage from bent or broken side members, then the casing strength is improved, but the weight of the drive unit increases
Solution Approach 1:
The patent applies local quality by varying the wall thickness of the casing according to the distribution of pressing forces. The thick portion is strategically positioned where pressing forces from bent or broken side members are most likely to occur, while other portions maintain standard thickness. This localized reinforcement improves strength without significantly increasing the overall weight of the drive unit.
4Reliability
If a thick portion is added to the casing to absorb energy from bent or broken side members, then the casing can withstand collision forces, but the manufacturing complexity increases
Solution Approach 1:
The patent implements local quality by adding a thick portion only at the specific location where pressing forces from bent or broken side members are most likely to occur. This localized thickening allows the casing to withstand collision forces effectively while minimizing the overall complexity of manufacturing, as only a specific region requires additional material or processing.
Data Source
AI summary
An electric vehicle includes: a side member; and a mechanical-electrical integrated unit attached to the side member through a fastener. The mechanical-electrical integrated unit is constituted by a drive apparatus and an electric-power control apparatus that are housed in a same casing. The casing has an upper space and a lower space that are vertically separated within the casing. The electric-power control apparatus is housed in the upper space while the drive apparatus is housed in the lower space. The fastener is attached to a fastened portion which is provided in a side wall of the casing and which is thicker than a surrounding portion surrounding the fastened portion. The side member includes a fragile portion that is located in a position overlapping the fastened portion as viewed in a width direction of the vehicle.