Vehicle Seat Coupling Structure for Low-Cost Vibration Isolation
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Solution Overview
Problem
The existing coupling structure in vehicle seats, which uses a bolt and nut with an elastic element to reduce vibration, is costly due to the complexity of molding and the need for multiple demolding processes, and the elastic element is difficult to insert without flange-like locking portions.
Innovation Solution
A vehicle seat design featuring a first collar with a changing inner diameter to securely hold a second elastic element through friction, eliminating the need for flange-like locking portions and simplifying the molding process, while also optimizing the contact area to enhance vibration reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flange-like locking portions are provided on the elastic element to prevent detachment, then the elastic element can be securely held, but the molding process becomes complicated requiring multiple demolding operations
Solution Approach 1:
The invention changes the geometric parameters of the collar by providing an inner diameter changing portion that varies the inner diameter along the axial direction. This creates a frictional force that secures the elastic element without requiring flange-like locking portions, thus simplifying the molding process while maintaining retention reliability
Solution Approach 2:
The invention extracts the locking function from the elastic element itself (by removing flange-like portions) and transfers it to the collar structure through the inner diameter changing portion, which provides friction-based retention
2Reliability
If flange-like locking portions are provided on the elastic element, then the elastic element can be securely held, but the insertion process becomes difficult
Solution Approach 1:
The inner diameter changing portion creates a gradual friction-based retention mechanism rather than an abrupt mechanical lock, allowing the elastic element to be easily inserted while still achieving secure retention through friction along the tapered surface
3Reliability
If a large contact area is provided between the collar and elastic element, then the elastic element is securely held, but vibration characteristics are transmitted between elastic elements
Solution Approach 1:
The invention applies local quality by providing the inner diameter changing portion only in a specific region of the collar, creating a localized friction zone that secures the elastic element without requiring extensive contact area, thereby reducing vibration transmission while maintaining retention
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
This design reduces manufacturing costs and improves vibration reduction performance by allowing easy insertion of the elastic elements and minimizing the influence of vibration characteristics, resulting in enhanced vibration isolation.
Implementation Method 1
a part of the first collar having the smallest inner diameter holds the second elastic element due to a frictional force
Data Source
AI summary
Provided is a vehicle seat capable of providing its coupling structure with a vibration reducing function at a low cost. One aspect of the present disclosure provides a vehicle seat including a cushion frame. The cushion frame includes a first member and a second member, and a coupling structure coupling the first and second members to each other. The coupling structure includes a first collar having a cylindrical shape and fixed to the first member, a second collar having a cylindrical shape and inserted in the first collar, a bolt inserted through the second collar, a first elastic element arranged between the first collar and the second member in an axial direction of the bolt, and a second elastic element held between the first and second collars in a radial direction of the bolt. The first collar has an inner diameter changing along an axial direction of the first collar.