Vehicle Sunvisor Damper Reduces Rotation Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sunvisors in vehicles often produce a loud 'tung' noise when returning due to their rapid rotation and collision with the headlining, which existing designs fail to adequately mitigate.
Innovation Solution
A damper device is integrated into the sunvisor system, comprising a housing filled with oil, an oil damper with frictional projections, and a coupling member, which increases frictional force to reduce the rotating speed of the sunvisor, thereby minimizing noise by slowing its return rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sunvisor is designed to rotate quickly for easy operation, then the ease of operation is improved, but the noise level increases due to rapid rotation and collision with the headlining
Solution Approach 1:
The harmful rapid rotation effect is extracted and separated from the useful rotation function by introducing a独立的阻尼装置. The damper device is installed between the pivot arm and sunvisor portion, containing oil and a frictional projection that independently provides frictional resistance to control the return rotation speed, while the sunvisor itself remains freely rotatable for easy operation.
Solution Approach 2:
The damper device acts as an intermediary element between the pivot arm and sunvisor portion. It contains oil that provides frictional resistance during return rotation, mediating the interaction between the sunvisor and headlining to prevent direct collision and reduce noise, while not interfering with the ease of operation during intentional rotation.
2Object-generated harmful factors
If a damper device is added to reduce rotating speed and noise, then the noise level is reduced, but the device complexity increases
Solution Approach 1:
The damper device is nested within the existing sunvisor structure. The housing is fixed to the sunvisor portion, and the oil damper with frictional projection is contained inside the housing, which itself is integrated into the pivot arm assembly. This nested arrangement adds the noise reduction function while minimizing the increase in overall device complexity by utilizing existing structural spaces.
Solution Approach 2:
The oil damper is a passive device that automatically provides frictional resistance during return rotation without requiring external control systems, power sources, or complex mechanisms. The frictional projection simply engages with the oil in the housing to naturally dampen the return motion, making the noise reduction function self-regulating and simple in design.
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 damper device effectively reduces the rotating speed of the sunvisor, preventing the 'tung' noise by increasing frictional force during rotation, ensuring a quieter operation.
Implementation Method 1
a damper device installed between the pivot arm and the sunvisor portion to reduce a rotating speed of the sunvisor portion through increasing of a frictional force
Implementation Method 2
An elastic member elastically supporting the oil damper is provided in a receiving chamber formed inside the housing
Data Source
AI summary
A sunvisor apparatus may include a pivot arm fixed to a headlining, a sunvisor portion rotatably installed at an end portion of the pivot arm, and a damper device installed between the pivot arm and the sunvisor portion to reduce a rotating speed of the sunvisor portion through increasing of a frictional force while the end portion of the pivot arm may be inserted into the damper device.