Air Vent Friction Element Design to Maintain Constant Operating Force
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Solution Overview
Problem
Conventional air vents with pivotably mounted slats experience variable operating forces due to friction changes between slat shoulder surfaces and housing walls, leading to abrasion, damage, and increased production costs from additional damping elements.
Innovation Solution
An air vent design with a friction element and lamella, where the bearing journal has a friction body that runs away from the housing side wall, ensuring friction occurs only between the friction element and the housing, preventing abrasion and maintaining constant friction torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional air vents use slat shoulder surfaces rubbing against housing walls for friction control, then the structure is simple, but the operating force becomes variable over time due to abrasion and surface changes
Solution Approach 1:
A friction element made of non-abrasive material (such as PTFE, polyacetal, or polypropylene) is introduced as an intermediary between the slat shoulder surface and the housing wall. This friction element transfers the frictional force while protecting the original surfaces from direct contact and abrasion, thereby maintaining constant operating force over time
Solution Approach 2:
The friction coefficient is controlled by selecting specific non-abrasive materials for the friction element. By changing the material parameters (choosing materials with appropriate friction coefficients and wear resistance), the operating force can be kept constant despite prolonged use and climatic variations
2Reliability
If additional spring arrangements or damping elements are added to reduce friction variations, then operating force stability improves, but production costs and device complexity increase
Solution Approach 1:
The friction element serves multiple functions simultaneously: it provides the necessary frictional force, prevents abrasion of the slat and housing, and maintains constant operating force without requiring additional spring arrangements or damping elements. The element is self-contained and requires no separate adjustment mechanisms
3Productivity
If slat and housing surfaces continuously rub against each other, then the air vent operates normally, but abrasion and damage occur over time
Solution Approach 1:
The friction element, made of non-abrasive material, converts the harmful rubbing action into a beneficial protective mechanism. The friction element absorbs the wear through its replaceable design while protecting the expensive slat and housing components from damage
Solution Approach 2:
The friction element acts as a sacrificial intermediary that protects the main structural components (slat and housing) from direct contact and abrasion. This mediator allows the air vent to operate normally while preventing damage to critical parts
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 maintains constant operating forces and protects the air vent components from wear, reducing production costs and preventing air deflection or turbulence, while ensuring minimal abrasion and consistent performance over time.
Implementation Method 1
a friction element (50) is arranged in the housing (12) in such a way that a friction surface (38) of the friction body (36) bears against a surface (56) of the friction element (50)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to an air outlet with at least one friction element and at least one lamella, which is pivotably mounted in a housing in an air duct via bearing pins, wherein at least one bearing pin has a friction body which extends at a distance from a side wall of the housing, over which the bearing pin is pivotably mounted in the housing, and the friction element is arranged in the housing of the air outlet such that a friction surface of the friction body rests against a surface of the friction element.