Split-Knuckle Suspension Coupling for Independent Wheel Steering
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Solution Overview
Problem
Existing vehicle suspensions limit independent steering of wheels, restricting vehicle stability and maneuverability due to simultaneous rotation of knuckles during steering.
Innovation Solution
A suspension coupling structure with a rotating knuckle and a fixed knuckle, allowing independent steering axes, where the rotating knuckle is connected to a steering input part and a lower arm, and the fixed knuckle is coupled to an upper arm and a toe link, enhancing toe change control and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single knuckle is used in traditional suspension, then the structure is simple, but independent steering of wheels is limited and vehicle stability deteriorates
Solution Approach 1:
The single knuckle is divided into two separate knuckles: a fixed knuckle and a rotating knuckle. The fixed knuckle remains stationary while the rotating knuckle can rotate independently around it. This segmentation allows the inner and outer wheels to steer independently, improving vehicle stability and maneuverability while maintaining a manageable structural complexity through modular design
2Manufacturing precision
If the knuckle rotates simultaneously with fixed knuckle during steering, then the steering mechanism is simple, but toe change control deteriorates
Solution Approach 1:
The rotation function is extracted from the fixed knuckle and assigned to a separate rotating knuckle. The fixed knuckle is taken out from the rotating motion, allowing it to maintain a stable position for precise toe change control. The rotating knuckle handles all rotational movement, enabling independent steering while improving toe control precision through separated functional responsibilities
3Stability of the object's composition
If inner and outer wheels have the same steering angle, then the steering system is simple, but vehicle stability deteriorates
Solution Approach 1:
The steering system is segmented into two independent steering axes: one for the inner wheel and one for the outer wheel. Each wheel can now achieve different steering angles simultaneously, with the inner wheel typically at a larger angle than the outer wheel during turns. This segmentation improves vehicle stability and reduces tire wear while maintaining reasonable system complexity through the use of two knuckles per wheel assembly
Data Source
AI summary
A suspension coupling structure includes: a lower arm including a first end coupled to a vehicle body, an upper arm coupled to an upper end of a fixed knuckle, a rotating knuckle located at a lower end of the fixed knuckle and an upper end of the lower arm and configured to be rotatably coupled to a wheel of a vehicle, a steering input part fixed to the fixed knuckle and configured to apply a steering force to the rotating knuckle, and a toe link configured to couple the fixed knuckle to the vehicle body.