Rear Motor Mounting Bracket Layout for Vehicle Rear Rigidity
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Solution Overview
Problem
Existing vehicle rear structures face challenges in securing sufficient space while maintaining rigidity, particularly when a drive unit is disposed under the floor panel, as they need to absorb impact loads effectively without compromising the transmission of impact to the drive unit.
Innovation Solution
The vehicle rear structure incorporates side members, a first cross member, a mounting bracket, a tilt member, and an inner panel, with specific joining portions to enhance rigidity and absorb impact loads, allowing for a larger space allocation while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cross member and additional members are provided to support the drive unit and increase rigidity, then supporting rigidity for the drive unit is improved, but device complexity and space occupation increase
Solution Approach 1:
The mounting bracket serves multiple functions: it supports the drive unit, increases rear structural rigidity, and provides impact load management. By integrating these functions into a single component rather than using separate members, the patent reduces device complexity while maintaining the required supporting rigidity.
Solution Approach 2:
The patent combines the support function and rigidity enhancement function into a single mounting bracket structure. Instead of providing separate cross members and additional rigidity-increasing members, the mounting bracket integrates both functions, simplifying the overall structure while achieving the desired mechanical performance.
2Volume of stationary object
If a spare tire is stored in the rear space, then space utilization is improved, but the ability to absorb impact loads is reduced when a drive unit is present
Solution Approach 1:
The mounting bracket acts as an intermediary structure between the drive unit and the vehicle body. It manages impact loads by providing a rigid mounting structure that can absorb and distribute impact forces, protecting the drive unit while allowing the spare tire to be stored in the same rear space without compromising impact absorption capability.
3Strength
If the mounting bracket is joined to both the first cross member and the inner panel, then rigidity in the rear of the vehicle is improved, but device complexity increases
Solution Approach 1:
The mounting bracket is designed as a multi-functional component that simultaneously provides structural support, rigidity enhancement, and impact load management. By joining it to both the first cross member and the inner panel, the patent achieves rear rigidity improvement without requiring additional separate members, thus avoiding increased device complexity.
Data Source
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AI summary
[Problem to be Solved] To secure a larger space under a floor while securing rigidity in the rear of a vehicle. [Solution] A vehicle rear structure includes side members 10, a first cross member 21 that extends in a vehicle width direction so as to connect the side members 10 on both sides and is disposed in the rear of a vehicle, and a motor unit. The front of a rear mounting bracket 30 that supports the motor unit is joined to an intermediate portion of the first cross member 21, the rear of the rear mounting bracket 30 is joined to a tail skirt inner panel 45, a first joining portion for joining the first cross member 21 and a lateral rod balancer 25 and a second joining portion for joining the first cross member 21 and the rear mounting bracket 30 are disposed next to each other in the vehicle width direction.