Vehicle Suspension Mounting Structure for Load Support and Noise Isolation
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Solution Overview
Problem
Conventional vehicle suspension mounting structures face challenges in ensuring the rigidity of supporting front suspensions without increasing vehicle weight, as they rely on rubber bushes that absorb road noise but not effectively handle load inputs during turns.
Innovation Solution
A suspension mounting structure featuring a pair of right and left front side frames with sub frames that include side sub frames extending in the front-rear direction, a rear sub cross member for coupling, and lower arm supporting parts that swingably and elastically support lower arms of the front suspension, with first and second fixing parts rigidly bonding the sub cross member to the vehicle body for enhanced load support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If rubber bushes are used in supporting parts to absorb road noise, then road noise transmission is reduced, but the front side frames cannot effectively support loads during turns requiring increased sub frame strength and weight
Solution Approach 1:
The supporting part is divided into multiple functional segments: an upper supporting part with a rubber bush for noise absorption, and a lower supporting part with rigid fixing parts for load support. This segmentation allows each segment to specialize in its function without compromise.
Solution Approach 2:
Different parts of the supporting structure have different properties: the upper supporting part uses elastic rubber material for noise absorption, while the lower supporting part uses rigid fixing parts (bolts, brackets) for load support. This local differentiation optimizes performance for each specific function.
2Strength
If sub frame strength is increased to handle load inputs during turns, then load support stability is improved, but vehicle body weight increases
Solution Approach 1:
The supporting part merges two functional elements: the upper supporting part with rubber bush and the lower supporting part with rigid fixing parts. This combination allows the system to achieve both noise absorption and strong load support without requiring the entire sub frame to be heavily reinforced.
Solution Approach 2:
The solution moves from a single-dimensional approach (either noise absorption or load support) to a multi-dimensional approach by adding vertical differentiation within the supporting part, with upper and lower sections performing different functions.
3Weight of moving object
If a simple configuration is used for sub frames, then vehicle body weight is reduced, but rigidity for supporting front suspension is insufficient
Solution Approach 1:
The sub frame uses a simple overall configuration but incorporates localized rigid fixing parts at critical positions where loads are transmitted to the vehicle body. This ensures rigidity only where needed rather than throughout the entire structure.
Solution Approach 2:
The supporting part is segmented into an upper portion with rubber bush and a lower portion with rigid fixing parts, allowing the majority of the sub frame to remain simple and lightweight while providing rigidity only at the necessary support points.
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
This configuration effectively supports thrust loads from the front suspension, absorbs road noise, and maintains a lightweight vehicle body while ensuring the rigidity needed for stable operation and quiet interior, even during turns and collisions.
Implementation Method 1
rear parts of the sub frames are provided with a pair of right and left lower arm supporting parts for swingably and elastically displaceably supporting lower arms of the front suspension
Data Source
AI summary
An object of the present invention is to effectively ensure the rigidity of supporting a front suspension with a simple configuration, without increasing the weight of a vehicle body.In a suspension mounting structure for a vehicle in which a front suspension is supported by sub frames 3, the sub frames 3 have a pair of right and left side sub frames 9 that extend in a front-rear direction of a vehicle in lower parts of front side frames 2; and a rear sub cross member 11 that couples rear end parts of the right and left side frames 9 to each other. Rear parts of the sub frames 9 are provided with: lower arm supporting parts for swingably and elastically displaceably supporting lower arms 41 of the front suspension; first fixing parts 31 that rigidly bond a rear end part of the rear sub cross member 11 to a bottom surface of a vehicle body; and second fixing parts 40 that rigidly bond side end parts of the rear sub cross member 11 to the bottom surface of the vehicle body at positions that are offset outward from the first fixing parts 31 in a vehicle width direction.