Vehicle Sun Visor Biasing Mechanism for Rod Creep
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Solution Overview
Problem
Existing vehicle sun visors require high biasing force to generate rotating torque, leading to deformation and creep of the support rod, especially when made of synthetic resin, which affects torque stability and shape retention.
Innovation Solution
A sun visor design that uses a biasing and holding member formed by a single leaf spring, holding the support rod at three circumferential points with a spring force, reducing the biasing force required while maintaining torque stability, and integrating the biasing force generating region as a mounting part to eliminate additional mounting components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a two-point holding system is used to clip the support rod, then a greater biasing force is required to generate the required torque, but this causes deformation and creep of the support rod
Solution Approach 1:
The support rod holding region is divided into three separate holding points arranged circumferentially around the support rod, replacing the conventional two-point clipping system. This segmentation distributes the biasing force across three regions, reducing the force required at each point while maintaining sufficient total torque generation capability.
2Power
If a greater biasing force is applied to generate required torque, then the torque generation is sufficient, but the support rod deforms and creeps under the increased force
Solution Approach 1:
The three holding points are arranged circumferentially to provide localized biasing forces at specific regions of the support rod. This local quality approach allows the biasing force to be distributed optimally around the circumference, generating sufficient rotating torque while preventing concentrated stress that would cause deformation and torque fluctuations.
3Weight of moving object
If the support rod is made of synthetic resin to reduce weight, then the sun visor becomes lighter, but the support rod creeps and cannot retain its circular shape
Solution Approach 1:
By dividing the holding system into three circumferential points, the stress distribution on the synthetic resin support rod is improved. This segmentation reduces concentrated loading at any single point, minimizing creep effects and helping the lightweight synthetic resin rod maintain its circular shape and structural stability.
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 the biasing force on the support rod, prevents deformation, and minimizes creep, ensuring stable torque generation and retention of the circular shape, enhancing operational ease and longevity.
Implementation Method 1
The biasing and holding member is formed by bending a single leaf spring and integrally includes a support rod holding region and a biasing force generating region
Implementation Method 2
A spring clip is provided inside the sun visor body and generates a predetermined rotating torque by biasing and holding the support rod from the outside when the sun visor body is pivoted
Data Source
AI summary
A sun visor for vehicles, in which a sun visor body can pivot on a support rod, and includes a biasing and holding member that biases and holds the support rod only by three regions in a circumferential direction of the support rod. The biasing and holding member is formed by bending a single leaf spring and integrally includes a support rod holding region and a biasing force generating region. The support rod holding region comprises the three regions that surround an outer surface of the support rod, and the biasing force generating region is formed at a predetermined distance from the support rod holding region in a direction transverse to the axial direction of the support rod. Further, the biasing force generating region is designed as a mounting part for mounting the biasing and holding member to the sun visor body.