Vehicle Seat Vibration Reduction via Segmented Weight
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Solution Overview
Problem
Existing vibration reduction methods for vehicle seats during engine idling increase manufacturing costs, reduce fuel efficiency, and pose safety risks due to increased weight and force requirements, while failing to effectively suppress seat vibration without compromising passenger safety.
Innovation Solution
A vibration reduction device that mounts a weight on a vehicle seat's back or headrest frame through an elastic bracket, allowing the weight to swing and bend elastically to counteract seat vibrations, thereby reducing forward/backward vibrations without being fixed to the frame, thus avoiding the overlap of natural frequencies between the engine and seat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a weight is attached to the seat headrest to reduce seat vibration during engine idling, then the natural frequency overlap between engine and seat is avoided, but the manufacturing cost and entire weight increase
Solution Approach 1:
The weight is segmented from the headrest assembly and mounted separately on the seatback top frame through an elastic bracket. This allows the weight to function independently as a vibration counterbalance while the headrest maintains its original lightweight structure, resolving the contradiction between vibration reduction effectiveness and weight increase.
Solution Approach 2:
An elastic bracket is introduced as an intermediary between the weight and the seatback top frame. This intermediary allows the weight to swing freely to counteract vibrations while isolating the headrest from the additional weight, thereby maintaining fuel efficiency and manufacturing cost benefits while achieving vibration reduction.
2Reliability
If the weight of the seat headrest is increased, then seat vibration during engine idling is reduced, but a larger force is required to move up/down the seat headrest
Solution Approach 1:
By segmenting the weight from the headrest and mounting it on the seatback top frame instead, the headrest assembly remains lightweight and easy to move. The weight functions separately to reduce vibrations without impeding headrest adjustability, resolving the contradiction between vibration reduction and ease of operation.
Solution Approach 2:
The elastic bracket serves as an intermediary that allows the weight to counteract vibrations while being decoupled from the headrest movement mechanism. This ensures that headrest adjustment requires minimal force while the weight continues to provide vibration reduction benefits.
3Reliability
If the weight of the seat headrest is increased, then seat vibration is reduced, but the restoring force when the seatback is moved forward/backward is increased
Solution Approach 1:
The weight is segmented from the headrest and mounted on the seatback top frame, allowing it to counteract vibrations without being part of the headrest assembly. This separation ensures that the restoring force during seatback movement remains low while vibration reduction effectiveness is maintained.
Solution Approach 2:
The elastic bracket acts as an intermediary that allows the weight to swing and counteract vibrations independently of the headrest movement. This decoupling ensures that the restoring force when moving the seatback forward or backward is not significantly increased, resolving the contradiction between vibration reduction and force requirements.
4Reliability
If the weight of the seat headrest is increased, then seat vibration is reduced, but the ability of the seat headrest to protect the passenger's neck is deteriorated
Solution Approach 1:
The weight is segmented from the headrest and mounted on the seatback top frame through an elastic bracket. This segmentation allows the weight to provide vibration reduction while the headrest maintains its original structure and protective function for the passenger's neck, resolving the contradiction between vibration reduction effectiveness and neck protection ability.
Solution Approach 2:
The elastic bracket serves as an intermediary that allows the weight to counteract vibrations while being isolated from the headrest structure. This ensures that the headrest's ability to protect the passenger's neck during collisions is not compromised by the added weight, maintaining both vibration reduction and safety performance.
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
Effectively reduces seat vibrations during engine idling by shifting the natural frequency of the seat out of the engine's frequency range, improving safety, reducing material costs, and enhancing passenger comfort without increasing the weight or force required to move the seat components.
Implementation Method 1
an elastic bracket that can elastically bend
Implementation Method 2
the weight swings and the elastic bracket bends forward/backward, thereby being able to reduce forward/backward vibration of the seat
Data Source
AI summary
A vibration reduction device for a vehicle seat that can reduce forward/backward vibration when the vehicle is stopped with the engine idling. The vibration reduction device includes a weight mounted through an elastic body in the seat back or the headrest of the seat.