Vehicle Suspension Coupling Rod for Caster Rigidity
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Solution Overview
Problem
Conventional double wishbone suspension devices face challenges in securing both caster rigidity and longitudinal compliance without compromising the suspension function, as hard rubber bushes suppress longitudinal displacement, leading to inadequate absorption of longitudinal impacts and poor ride quality.
Innovation Solution
A double wishbone suspension device with a coupling rod that slants in the vehicle longitudinal direction, rotatably connected to both the upper and lower arms, allowing for independent vertical rotation and securing caster rigidity while maintaining longitudinal compliance without the need for hard rubber bushes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If hard rubber bushes are used to suppress upper and lower arms from displacing in opposite directions during braking, then caster rigidity is secured, but longitudinal compliance is suppressed and ride quality deteriorates
Solution Approach 1:
The vehicle-body connection portions are divided into two separate connection points spaced apart in the longitudinal direction, allowing independent movement in the longitudinal direction while maintaining lateral stability through the facial-shaped connecting member
Solution Approach 2:
The facial-shaped connecting member acts as an intermediary that connects the upper and lower arms at two separate longitudinal positions, providing stability without completely restricting longitudinal movement, thus mediating between rigidity and compliance requirements
2Stability of the object's composition
If a facial-shaped connecting member integrally connects vehicle-body connection portions of upper and lower arms, then caster rigidity and longitudinal compliance are secured, but vertical rotation of arms is restricted and suspension function is damaged
Solution Approach 1:
The connection between the facial-shaped connecting member and the arms is made rotatable rather than fixed, allowing the connection to adapt dynamically between providing stability during braking and allowing vertical rotation during suspension operation
Solution Approach 2:
The facial-shaped connecting member provides connection in two longitudinal dimensions while allowing rotation in the vertical dimension, separating the constraints in different spatial dimensions to achieve both stability and suspension function
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 solution effectively secures caster rigidity and longitudinal compliance, enhancing the vehicle's ride quality by allowing the upper and lower arms to move in opposite directions during braking while maintaining vertical rotation, thus improving the suspension's overall performance.
Implementation Method 1
the upper arm and the lower arm can be suppressed from being displaced in the opposite direction of the vehicle longitudinal direction during the braking by the coupling rod
Implementation Method 2
the longitudinal compliance of the suspension which is provided by the rubber bushes
Data Source
AI summary
A suspension device for a vehicle of the present invention comprises a knuckle supporting a wheel, an upper arm vertically rotatably connected to a vehicle body and pivotally supporting an upper portion of the knuckle, a lower arm provided below the upper arm and vertically rotatably connected to the vehicle body, and a coupling rod coupling the upper arm and the lower arm, wherein the coupling rod is configured to slant in a vehicle longitudinal direction and be rotatably connected to the upper arm and the lower arm, respectively.