Seat Base Net Torsion Bar Layout for Comfort and Vibration Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing seat structures with torsion bar-based base net supporting mechanisms for seat cushions face issues with vibration absorbency, comfort, and a sense of foreignness due to fixed front ends and limited flexibility, leading to discomfort and inadequate support during seating and vibrations.
Innovation Solution
A base net supporting mechanism with a first torsion bar unit positioned rearward and a second torsion bar unit positioned forward, allowing the base net to be stretched between their supporting frames, with adjustable pivoting ranges and engaging brackets to enhance flexibility and comfort, and an auxiliary elastic mechanism to support loads and prevent bottom touch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the front end of the base net is fixed to the front frame, then the base net can be supported, but a sense of hitting on the front end is perceived during pedal operation and the cushioning effect is reduced
Solution Approach 1:
The front end of the base net is changed from a fixed connection to a dynamic connection via a second torsion bar unit that allows rotational movement. This enables the front end to move with the cushioning member during pedal operation, eliminating the hitting sensation while maintaining support stability through the elastic restoration of the torsion bar.
2Object-affected harmful factors
If a torsion bar is disposed in the rear of the seat cushion with arms and supporting frame, then vibration absorbency is improved, but a feeling of foreignness and hammock seating is caused due to pulling the rear end upward
Solution Approach 1:
The single rear torsion bar support is segmented into two separate torsion bar units: one in the rear and one in the front. This segmentation distributes the support function across both ends, allowing each torsion bar to independently manage its local area, thereby maintaining vibration absorbency while eliminating the hammock effect caused by unbalanced rearward pulling.
3Ease of operation
If urethane material is used under the buttocks to eliminate hammock feeling, then seating comfort is improved, but the hip point is raised and the natural cushioning effect is reduced
Solution Approach 1:
The mechanical urethane material layer is replaced with an elastic torsion bar mechanism that provides cushioning through rotational elasticity rather than material compression. This substitution maintains the hip point at the natural lower position while providing the necessary comfort through the torsion bar's elastic restoration, eliminating the need for additional urethane layers that would raise the hip point.
4Reliability
If the base net is stretched tightly across the seat frame, then support stability is improved, but vibration absorbency and sense of stroke are reduced
Solution Approach 1:
The base net is connected to dynamic torsion bar units at both ends instead of fixed points, allowing the net to move and stretch dynamically with vibrations and seating movements. This dynamic connection maintains support stability through the elastic restoration of the torsion bars while enabling vibration absorbency and sense of stroke through controlled movement and energy dissipation.
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 improves seating comfort by maintaining a lower hip point, enhancing vibration absorbency, and reducing the feeling of foreignness, while providing a sense of stroke and uniform support, thus enhancing overall riding comfort and vibration damping.
Implementation Method 1
a first torsion bar unit including a torsion bar, arms connecting to the torsion bar, and a supporting frame supported by the arms, and the arms being provided in the rear of the seat cushion pivotably in front and behind around the torsion bar acting as a fulcrum
Data Source
AI summary
In order to improve seating comfort and vibration absorbency, a structure including a first torsion bar unit 70 disposed in the rear of a seat cushion, and a second torsion bar unit 80 disposed in the front of the seat cushion, and a base net 60 stretched between a rear supporting frame 74 of the first torsion bar unit 70 and a front supporting frame 84 of the second torsion bar unit 80, is provided. Owing to the elastic force of a front torsion bar 81 of the second torsion bar unit 80 positioned in the front of the seat, a sense of stroke at the time of seating is enhanced. Owing to the elastic force of a rear torsion bar 71 of the first torsion bar unit 70 positioned in the rear of the seat, similarly to the conventional structure, a load of a seated person can be sufficiently received and a stable seating comfort can be obtained. Since both the first torsion bar unit 70 and the second torsion bar unit 80 work together to dampen vibration inputted during driving, vibration absorbency is more enhanced than ever.