Bag-Contained Vehicle Seat Pad for Vibration Control
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Solution Overview
Problem
Existing methods for changing the vibration transmissibility and sense of seating in vehicle seats, such as adjusting the air permeability of cushion pads, fail to effectively modify the compression deflection curve and seating sensation when the cushion pad is compressed slowly.
Innovation Solution
A seat pad design featuring a bag-contained pad part with a foam body and a non-stretchable bag body inside, where a pump supplies fluid to adjust the air volume within the bag, allowing for independent control of vibration transmissibility and seating sensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the opening area of the ventilation window is increased to increase air permeability, then vibration transmissibility is increased, but the compression deflection curve and sense of seating cannot be changed
Solution Approach 1:
The cushion pad is divided into two independent functional parts: a foam body for providing the base structure and compression characteristics, and a bag body containing fluid for independently controlling vibration transmissibility. This segmentation allows each part to perform its specific function without interfering with the other, enabling independent adjustment of seating sensation and vibration characteristics.
Solution Approach 2:
A pump is introduced to supply fluid (air or liquid) to the bag body, enabling dynamic control of the bag body's internal pressure and volume. This pneumatic/hydraulic system allows the vibration transmissibility to be adjusted independently from the foam body's compression characteristics, resolving the contradiction between vibration control and seating sensation.
2Adaptability or versatility
If a pump is added to control fluid supply to the bag body, then both vibration transmissibility and sense of seating can be changed, but device complexity increases
Solution Approach 1:
The pump serves multiple functions: it supplies fluid to the bag body for vibration control, and by adjusting the fluid volume and pressure, it also indirectly influences the overall cushion characteristics. This multi-functionality justifies the added complexity by providing comprehensive control capability over both vibration and seating characteristics.
3Manufacturing precision
If the bag body volume is constrained during manufacturing, then manufacturing precision is improved, but the ability to adjust air volume for vibration control is limited
Solution Approach 1:
The bag body's volume is made dynamically adjustable through the pump system. During manufacturing, the bag body is constrained to a specific volume for precise positioning and assembly. After assembly, the pump can dynamically increase or decrease the air volume within the bag body to control vibration transmissibility, thus resolving the contradiction between manufacturing precision and operational adaptability.
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
Enables the adjustment of vibration transmissibility and seating sensation independently, providing a softer or harder feel by varying the air volume, while maintaining resonance frequency stability.
Implementation Method 1
a pump connected to the bag body to be capable of supplying a fluid to an inside of the bag body
Data Source
AI summary
According to the disclosure, a seat pad 2 includes a bag-contained pad part 250 including a foam body 240 and a bag body 230 arranged inside the foam body 240.