Vehicle Front Structure With Isolated Cross Beam for Motor Stability
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Solution Overview
Problem
Existing vehicle front structures face challenges in balancing collision load absorption through side frame deformation and preventing motor movement during collisions, leading to increased development time and cost, while also requiring insulation protection for high-voltage motors.
Innovation Solution
A vehicle front structure design that separates the cross beam from the side frame and positions the motor on the cross beam, allowing independent control of side frame deformation and motor movement, with the cross beam disposed above the side frame to minimize overhang and absorption of collision load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the cross beam is connected to the side frame to transfer collision load, then the collision load can be distributed to the cross beam, but the cross beam may deform or move with the motor, compromising insulation safety
Solution Approach 1:
The patent divides the load-bearing structure into separate components: the side frame handles collision load absorption through deformation, while the cross beam remains separate and connected only to suspension support members. This segmentation prevents the cross beam and motor from moving during collision, maintaining insulation safety while still enabling load transfer through the side frame's deformation path.
Solution Approach 2:
The patent introduces suspension support members as intermediary components that connect the cross beam to the vehicle body without connecting the cross beam to the side frame. This intermediary connection allows the cross beam to remain stable and isolated from collision-induced movements, ensuring motor insulation safety while maintaining structural integrity.
2Length of moving object
If the cross beam is positioned lower to reduce overhang, then the vehicle front structure is more compact, but crushed residue blocks the path between the cross beam and the front of the vehicle
Solution Approach 1:
The patent positions the cross beam in the vehicle height direction (vertically) rather than only in the length direction (horizontally). By disposing the cross beam above the side frame in the height dimension, the patent creates a three-dimensional load transfer path that avoids crushed residue accumulation in front of the cross beam, while still achieving compact overhang through optimized positioning.
3Force
If the side frame is designed to deform for load absorption, then collision load can be absorbed effectively, but the motor may move due to cross beam movement
Solution Approach 1:
The patent segments the motor mounting system into two independent parts: the side frame that deforms for load absorption, and the cross beam with suspension support members that remains stable. The cross beam is connected to suspension support members but not directly to the deforming side frame, creating independent deformation and stability zones that prevent motor movement while maintaining effective load absorption.
Data Source
AI summary
The invention provides a vehicle front structure having good collision safety performance. The vehicle front structure includes: a pair of left and right suspension support members used to support a suspension device of a vehicle; a side frame connected to the suspension support members and extended toward a front of the vehicle; a cross beam connected to the pair of left and right suspension support members in a vehicle width direction, and the cross beam is disposed separately from the side frame above the side frame; and a driving source fixing part used to fix a driving source for driving the vehicle and disposed on the cross beam.