Webbing Take-up Device Vibration Damping Frame
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing webbing take-up devices fail to effectively suppress vibration transmission from the spool rotation to the vehicle body, leading to abnormal noise inside the vehicle.
Innovation Solution
A webbing take-up device with a frame that includes a fixed portion attached to the vehicle body and a rotation stop portion spaced apart, featuring a damping member between the rotation stop portion and the vehicle body to absorb vibrations, and a limiting portion to control deformation, along with a bolt and washer configuration to prevent excessive torsional deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the rotation stop portion is engaged directly with the vehicle body, then rotational displacement is restricted, but vibration is transmitted to the vehicle body
Solution Approach 1:
A damping member is introduced as an intermediary component between the rotation stop portion and the vehicle body. This damping member serves as a mediator that maintains the rotational restriction function while simultaneously absorbing and reducing vibration transmission to the vehicle body, thus resolving the contradiction between stability and vibration generation.
Solution Approach 2:
The harmful vibration transmission function is extracted from the rotation stop portion by introducing a separate damping member. The rotation stop portion focuses solely on restricting rotational displacement, while the damping member independently handles the vibration absorption, separating the two functions to eliminate the contradiction.
2Object-generated harmful factors
If the damping member is allowed to deform freely, then vibration damping effect is enhanced, but excessive deformation occurs
Solution Approach 1:
A limiting portion is provided in advance to prevent excessive deformation of the damping member before it occurs. This preliminary constraint ensures that the damping member operates within safe deformation limits while still providing effective vibration damping, preventing damage before it can happen.
Solution Approach 2:
The limiting portion acts as a protective constraint that cushions against excessive deformation. By providing this limitation beforehand, the system protects the damping member from undergoing deformations that would compromise its structural integrity and durability.
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 effectively suppresses vibration transmission from the spool rotation to the vehicle body, reducing noise and ensuring stable operation by utilizing damping members to absorb and limit deformation, thereby enhancing the damping effect without excessive deformation.
Implementation Method 1
a damping member, that damps vibration transmitted from the frame, is provided between the rotation stop portion and the vehicle body
Data Source
AI summary
A webbing take-up device that includes a spool that is rotated in a take-up direction to take up webbing worn by an occupant and that is rotated in a pull-out direction by the webbing being pulled out, and a frame that rotatably supports the spool. The frame includes a fixed stay portion that is fixed to a vehicle body, and a rotation stop stay portion that is disposed spaced apart from the vehicle body and that by being engaged with the vehicle body is restricted from rotational displacement relative to the fixed stay portion.