Suspension Device Bracket Segmentation for Rigidity
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Solution Overview
Problem
Existing suspension devices of the double wishbone type face a challenge in maintaining rigidity while allowing for design improvements, leading to a potential decrease in strength and vibration resistance.
Innovation Solution
A suspension device configuration featuring an upper arm and lower arm with a shock absorbing device, a leaf spring extending in the vehicle width direction, and a transmission unit between the suspension cross member and leaf spring, along with a second bracket that independently transmits the elastic force of the leaf spring to the side member, enhancing rigidity and design freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If design improvements are made to increase degree of freedom in relationships between constituent elements, then design freedom is improved, but rigidity and strength may significantly decrease
Solution Approach 1:
The suspension device is divided into functionally independent bracket systems: a first bracket system for shock absorption and a second bracket system for leaf spring force transmission. This segmentation allows each bracket to be optimized for its specific function while maintaining overall structural rigidity through independent force transmission paths.
Solution Approach 2:
The second bracket is positioned on the vertically lower side of the side member, creating a three-dimensional spatial arrangement. This vertical dimension separation allows the leaf spring force to be transmitted independently from the shock absorption path, enabling design freedom without compromising rigidity.
2Device complexity
If the second bracket is integrated with the first bracket, then device complexity is reduced, but design freedom and rigidity are compromised
Solution Approach 1:
The brackets are segmented into separate components: the first bracket for shock absorption and the second bracket for leaf spring force transmission. This segmentation enables independent optimization of each bracket's design and function, providing greater design freedom while maintaining manageable complexity through clear functional separation.
Solution Approach 2:
Each bracket is designed with specialized functionality rather than attempting universal application. The first bracket handles shock absorption while the second bracket transmits leaf spring forces, allowing each component to be optimized for its specific purpose rather than being a generic multi-purpose bracket.
3Strength
If additional brackets and transmission units are added, then rigidity is improved, but device complexity and weight increase
Solution Approach 1:
The force transmission system is segmented into distinct functional paths: shock absorption forces are handled by the first bracket while leaf spring forces are transmitted through the second bracket. This segmentation creates clear, simple force transmission routes that maintain rigidity without requiring complex interconnected structures.
Solution Approach 2:
By utilizing the vertical dimension to position the second bracket below the side member, the patent creates independent force transmission paths in three-dimensional space. This spatial arrangement allows multiple force paths without increasing planar complexity, maintaining structural simplicity while improving rigidity.
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 suspension device achieves excellent rigidity and improved assemblability without significant weight increase, allowing for effective vibration resistance and enhanced design flexibility.
Implementation Method 1
a shock absorbing device disposed between the lower arm and the side member
Implementation Method 2
a leaf spring extending in the vehicle width direction, the leaf spring having an end portion disposed on the lower arm
Data Source
AI summary
A suspension device according to one embodiment of the present disclosure is equipped with: an upper arm; a lower arm; a leaf spring positioned so as to extend in the vehicle widthwise direction in a manner such that an end section thereof is provided on the lower arm; a first bracket configured in a manner such that a shock absorber connected to the lower arm is connected to the outside of a side member in the vehicle widthwise direction; an upper bushing capable of transmitting force between the leaf spring and a suspension cross member; and a second bracket which is independent from the first bracket and is positioned below the side member between the side member and the leaf spring so as to be capable of transmitting the elastic force of the leaf spring to the side member via the upper bushing.