Dynamic Damper Headrest with Segmented Attachment for Front-Rear Vibration Control
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Solution Overview
Problem
Existing headrests with dynamic dampers tend to restrict the displacement of weights, which can limit their effectiveness in damping vibrations, particularly in the front-rear direction.
Innovation Solution
A headrest design featuring a dynamic damper with an attachment member having a front-back opening, where the elastic member is fixed along its perimeter by the edge of the opening, allowing the weight to preferentially displace in the front-back direction, and optionally including clearances and connecting members to control displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the weight is placed in a bottomed recess opening toward the rear of the vehicle with the bottom of the recess located on the front side, then the weight is less likely to be displaced toward the front, but displacement of the weight in the front-rear direction is restricted
Solution Approach 1:
The attachment member is divided into a front-side divided body and a back-side divided body that are placed next to each other. The elastic member is sandwiched between these two divided bodies from both sides in the front-back direction, fixing it along its entire perimeter by the edge of the opening. This segmentation allows the opening to extend through the attachment member without requiring a closed recess structure.
Solution Approach 2:
Instead of using a closed recess structure to restrict weight displacement, the invention inverts the approach by using an open structure where the opening extends through the attachment member. The elastic member is fixed by being sandwiched between divided bodies, allowing the weight to displace freely in the front-back direction while still providing vibration damping.
2Reliability
If the opening is closed by the attachment member on either side in the front-back direction, then the weight displacement is restricted, but the dynamic damper effectiveness is reduced
Solution Approach 1:
The attachment member is segmented into front-side and back-side divided bodies that sandwich the elastic member. This segmentation creates an open structure where the opening extends through the attachment member, allowing the weight to move freely in the front-back direction to effectively damp vibrations while the divided bodies maintain proper positioning.
Solution Approach 2:
The invention changes the structural parameter of the opening from closed to open in the front-back direction. This parameter change allows the weight to have freedom of displacement in the front-back direction (improving vibration damping) while the elastic member remains fixed along its entire perimeter by the edge of the opening (maintaining positioning stability).
3Reliability
If the elastic member is fixed along its entire perimeter by the edge of the opening, then excessive displacement of the weight is restricted, but the displacement of the weight in the front-back direction is limited
Solution Approach 1:
The elastic member is fixed along its entire perimeter by the edge of the opening through the sandwiching structure, providing stable positioning in lateral directions. However, the opening extends through the attachment member in the front-back direction, creating a local quality difference that allows free displacement in the front-back direction while restricting excessive displacement in other directions.
Solution Approach 2:
The fixing structure operates differently in different dimensions: the elastic member is fixed along its entire perimeter in lateral dimensions, providing stability, while the opening extends through the attachment member in the front-back dimension, allowing mobility. This dimensional differentiation resolves the contradiction between stability and mobility.
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 enhances the ability to dampen vibrations by allowing more flexible displacement of the weight, effectively reducing excessive displacement while maintaining ease of production and attachment to the stay.
Implementation Method 1
an elastic member fixed along its entire perimeter by an edge of the opening and placed in the opening
Implementation Method 2
The urethane mat forms a spring system of the dynamic damper
Implementation Method 3
a weight embedded in the elastic member and placed in the opening, the weight forms a mass system of the dynamic damper
Implementation Method 4
a dynamic damper for damping vibrations
Data Source
AI summary
A headrest includes a stay, a headrest body, and a dynamic damper attached to the stay. The dynamic damper includes: an attachment member having an attachment portion attached to the stay and an opening having no bottom; an elastic member fixed along its entire perimeter by an edge of the opening and placed in the opening; and a weight embedded in the elastic member and placed in the opening. The attachment member includes a front-side divided body and a back-side divided body. The elastic member is sandwiched between the front-side divided body and the back-side divided body, whereby the elastic member is fixed along its entire perimeter by the edge.