Rear-Side Frame Cross Member Layout for Suspension Vibration Control
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Solution Overview
Problem
The existing vehicle-body structures experience vibration and noise due to the load input from rear suspension devices, primarily because the central members receive compression loads, leading to deflection deformation.
Innovation Solution
A vehicle-body structure is designed with a cross member positioned lower than the load input portions, connected through rear connection frames that tilt upward, thereby converting the compression load into a pulling load, reducing deflection deformation and associated vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If central members extend from tunnel frames to rear side frames, then the vehicle-body structure can transfer loads from rear suspension devices, but the central members undergo deflection deformation and generate vibration and noise due to compression loads
Solution Approach 1:
The patent inverts the conventional load transfer path by positioning the cross member lower than the rear side frames and using rear connection frames that tilt upward to connect them. This inversion changes the load application mode from compression to pulling, eliminating deflection deformation and vibration while maintaining load transfer capability.
Solution Approach 2:
The patent changes the geometric parameters of the connection structure by positioning the cross member lower than the rear side frames and designing the rear connection frames with an upward tilt. This parameter change transforms the loading condition from compression to pulling, resolving the vibration and noise issue.
2Device complexity
If rear connection frames are positioned horizontally, then the structure is simple, but the connection frames undergo deflection deformation under compression load
Solution Approach 1:
Instead of maintaining horizontal rear connection frames, the patent inverts the geometric relationship by positioning the cross member lower than the rear side frames, creating upward-tilting connection frames. This inversion eliminates deflection deformation under load while maintaining structural simplicity.
3Ease of manufacture
If the cross member is positioned at the same height as the load input portions, then the rear connection frames are horizontal and easy to manufacture, but they experience compression loads causing deflection
Solution Approach 1:
The patent changes the vertical position parameter of the cross member, positioning it lower than the load input portions. This parameter change transforms the rear connection frames from horizontal to upward-tilting, converting compression loads to pulling loads and eliminating deflection while remaining manufacturable.
Data Source
AI summary
To suppress vibration and noise due to load input from a rear suspension device, a left-side load input portion that is fixed to a left-side rear-side frame and to which a load from a rear suspension device is input, and a right-side load input portion that is fixed to a right-side rear-side frame and to which a load from a rear suspension device is input are provided. A cross member is provided at a position lower than the left-side load input portion and the right-side load input portion to which loads from the rear suspension devices are input. The cross member and the left-side load input portion are connected through a left-side rear connection frame. The cross member and the right-side load input portion are connected through a right-side rear connection frame.