Rear Side Frame Bracket Reinforcement for Trailing Arm Stress
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Solution Overview
Problem
Existing vehicle body rear part structures fail to adequately support stresses in the vehicle width and forward/rearward directions applied to trailing arms during rapid vehicle turns, leading to potential instability.
Innovation Solution
A vehicle body rear part structure that includes a side sill, rear side frame with an arm insertion hole, a cross member, a trailing arm supported by a mount member, an arm attachment bracket with a C-shaped cross section, and a bracket reinforcement member that is directly or indirectly joined to the side sill and cross member, providing enhanced support through a close plate and fixation nuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the existing vehicle body rear part structure is used, then the structure is simple, but it cannot sufficiently support the stress applied to the trailing arm during rapid turning
Solution Approach 1:
The support structure is divided into multiple functional components: the arm attachment bracket for mounting the mount member, the bracket reinforcement member for strengthening the bracket, and the close plate for closing the opening. This segmentation allows each component to be optimized for its specific function while collectively providing sufficient stress support capability.
Solution Approach 2:
The bracket reinforcement member is pre-installed on the arm attachment bracket before final assembly. This preliminary action ensures that the reinforcement structure is already in place to withstand the high stresses during rapid turning, preventing structural failure before it occurs.
2Strength
If the cross section of the rear side frame is enlarged to support the stress, then the stress support capability is improved, but the vehicle body size increases
Solution Approach 1:
Instead of enlarging the cross section of the rear side frame in the horizontal plane, the solution adds structural elements in the vertical dimension. The bracket reinforcement member extends vertically to provide additional support surfaces, and the close plate closes the opening from above, effectively increasing the load-bearing capacity without expanding the horizontal footprint.
Solution Approach 2:
The reinforcement is applied locally at the critical stress concentration point (the arm attachment bracket area) rather than uniformly throughout the entire rear side frame. The bracket reinforcement member and close plate are strategically positioned only where needed to support the trailing arm stress, maintaining the overall compact dimensions of the vehicle body.
3Stability of the object's composition
If the bracket reinforcement member is added, then the stress distribution is improved, but the manufacturing complexity increases
Solution Approach 1:
The bracket reinforcement member is designed to be integrated with the arm attachment bracket through direct attachment. This merging of components simplifies the assembly process by reducing the number of separate parts that need to be installed and ensures proper alignment and stress distribution without requiring complex manufacturing procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The structure effectively supports stresses in both the vehicle width and forward/rearward directions by distributing loads through the bracket reinforcement member, ensuring stability and preventing deformation during rapid turns without enlarging the cross section of the rear side frame.
Implementation Method 1
a mount member that includes a rubber elastic body
Data Source
AI summary
A vehicle body rear part includes a side sill, a rear side frame, a cross member, a trailing arm, an arm attachment bracket, and a close plate. In the trailing arm, a front end part is swingably supported via a mount member at a front region of the rear side frame. The arm attachment bracket is fixed into a cross section of the rear side frame and has a fixation nut with which the mount member is fastened and fixed. The bracket reinforcement member reinforces the arm attachment bracket. The close plate closes an opening on an upper side of the front region of the rear side frame. End parts on both sides in the vehicle width direction of the bracket reinforcement member are joined to the side sill and the cross member, and an upper part of the bracket reinforcement member is joined to the close plate.