Rear Suspension Structure With Parallel Resilient Bushes
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Solution Overview
Problem
Conventional rear suspension structures face a trade-off between handling stability and road-following property, with hard resilient bushes improving steering responsiveness but potentially deteriorating road-following ability, and soft bushes compromising wheel support rigidity.
Innovation Solution
A rear suspension structure featuring an upper arm, H-shaped lower arm, auxiliary link, and shock absorber with resilient bushes having parallel axes to the vehicle longitudinal direction, and an auxiliary link connecting one lower arm portion directly to the wheel, allowing for oblique imaginary axial lines that minimize twisting and enhance vertical movement smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If resilient bushes are configured to be hard (small compliance), then wheel support rigidity and steering responsiveness are improved, but road-following property and riding conformability deteriorate
Solution Approach 1:
The invention applies different compliance characteristics to different parts of the suspension system. The resilient bushes at the vehicle-body connection portions of the lower arm are configured with small compliance (hard) to provide wheel support rigidity, while the resilient bush at the wheel-side connection portion is configured with large compliance (soft) to improve road-following property. This local differentiation allows each component to optimize its function independently.
Solution Approach 2:
The suspension system is segmented into multiple connection portions with independently configurable resilient bushes. By dividing the lower arm into front and rear vehicle-body connection portions and a wheel-side connection portion, each with its own resilient bush, the system can independently tune the compliance characteristics at each location to achieve both rigidity and road-following performance.
2Ease of operation
If resilient bushes at front and rear vehicle-body connection portions are configured to have large compliance to suppress twisting, then road-following property is improved, but wheel support rigidity in vehicle width direction deteriorates
Solution Approach 1:
The invention assigns different compliance values to different resilient bushes based on their specific functional requirements. The bushes at vehicle-body connection portions use small compliance for rigidity, while the bush at the wheel-side connection uses large compliance for road-following, resolving the contradiction between these two requirements.
Solution Approach 2:
The suspension system dynamically adapts to different loading conditions through the combination of hard and soft resilient bushes. The hard bushes maintain structural integrity and wheel support rigidity under lateral loads, while the soft bush allows controlled deformation to improve road-following during vertical road irregularities.
3Stability of the object's composition
If resilient bushes are configured to be hard, then handling stability is improved, but anatomic problem (deteriorated road-following property) may occur
Solution Approach 1:
The invention creates local quality differences in the suspension system by configuring resilient bushes with different compliance characteristics at different locations. The hard bushes at vehicle-body connections provide handling stability, while the soft bush at the wheel-side connection ensures good road-following property, eliminating the need to choose between the two opposing requirements.
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 achieves high wheel support rigidity while maintaining road-following conformability, improving handling stability and toe-in control of the rear wheel, thereby balancing vehicle controllability and road-following properties.
Implementation Method 1
a resilient bush having a bush axis which is configured to be parallel to a standard line extending in a vehicle longitudinal direction in a plan view
Implementation Method 2
a shock absorber provided to be connected to the lower arm and a vehicle body
Data Source
AI summary
In a rear suspension device of an automotive vehicle, a shock absorber is provided perpendicularly to a H-shaped lower arm in a side view, respective axis of resilient bushes of pivotal portions which pivotally support upper and lower arms at a vehicle-body side are configured to be parallel to a standard line which extends in a vehicle longitudinal direction in a plan view, and an imaginary axial line which interconnects respective centers of front and rear connection portions, via which the lower arm is connected to a wheel side, is configured to extend obliquely forward and inward relatively to the vehicle longitudinal direction.