Glass Run Channel Coating Layout for Smooth Window Sliding
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Solution Overview
Problem
The increasing difficulty in moving window panes due to higher reaction forces at the root side of the lip portion of glass run channels, especially with changing window lifting mechanisms, necessitates improved sliding properties and attachment workability without hindering bending deformations.
Innovation Solution
A glass run channel with elastically deformable lip portions and covering portions having varying friction coefficients and hardnesses is designed, where the first covering portion on the sliding surface is harder than the second covering portion, ensuring smooth operation and preventing increased reaction forces at the bending point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coating layer with good sliding property is formed on the lip portion, then the sliding property with respect to the window pane is improved, but the reaction force against bending deformation on the root side of the lip portion increases
Solution Approach 1:
The patent applies different covering portions with different friction coefficients and hardnesses to different regions of the lip portion. The first covering portion with lower friction coefficient is applied to the sliding surface that contacts the window pane, while the second covering portion with higher friction coefficient is applied to the visible portion. This local differentiation allows the sliding surface to have good sliding properties without requiring the entire lip portion to be covered with low-friction material, thereby reducing the reaction force against bending deformation while maintaining operational smoothness.
Solution Approach 2:
The patent changes the physical parameters of the covering layers by controlling the friction coefficient and hardness. The first covering portion has a friction coefficient of 0.2 or less and Shore A hardness of 40 or more, while the second covering portion has a friction coefficient of 0.4 or less and Shore A hardness of 80 or more. By adjusting these parameters locally, the patent achieves good sliding properties where needed while minimizing the increase in reaction force against bending deformation.
2Ease of operation
If the coating layer is formed to the root of the lip portion, then the sliding property is improved, but the attachment workability deteriorates due to increased reaction force
Solution Approach 1:
The patent applies the first covering portion with lower friction coefficient only to the sliding surface of the lip portion, and the second covering portion with higher friction coefficient to the visible portion. This localized application ensures that the root area, which needs to be pushed during attachment, does not have excessive low-friction coating that would increase reaction force, while still providing good sliding properties where the window pane contacts the lip portion.
Solution Approach 2:
The patent controls the friction coefficient and hardness parameters of the covering portions to optimize both sliding property and attachment workability. The first covering portion has friction coefficient ≤0.2 and Shore A hardness ≥40, while the second covering portion has friction coefficient ≤0.4 and Shore A hardness ≥80. This parameter differentiation allows the root area to maintain adequate friction for pushability during attachment while the sliding surface maintains low friction for smooth operation.
3Ease of operation
If a harder covering portion is used, then the sliding property is improved, but the flexibility of the lip portion decreases
Solution Approach 1:
The patent applies the harder first covering portion (Shore A hardness ≥40) only to the sliding surface of the lip portion where good sliding properties are needed, while the visible portion receives the softer second covering portion (Shore A hardness ≥80). This localized hard coating provides excellent sliding properties where contact with the window pane occurs, while preserving the flexibility of the lip portion in other areas that require elastic deformation during attachment and operation.
Solution Approach 2:
The patent carefully controls the hardness parameter of the covering portions. The first covering portion has Shore A hardness of 40 or more but not excessive, and the second covering portion has Shore A hardness of 80 or more. By moderating the hardness values and applying them locally, the patent achieves good sliding properties without overly compromising the flexibility and elastic deformability of the lip portion.
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
Enhances sliding properties for window pane movement and improves attachment workability by maintaining flexibility and reducing reaction forces at the root side of the lip portion, ensuring continuous sliding and ease of installation.
Implementation Method 1
a first covering portion having a friction coefficient smaller than that of the lip portion is formed on a distal end side of the lip portion with respect to the bending point within a surface of the lip portion sliding with the window pane; and a second covering portion having a friction coefficient smaller than that of the lip portion is formed over a surface of the visible portion
Implementation Method 2
a bending point is located on a root side of the lip portion, the bending point at which the lip portion is bent when the lip portion is elastically deformed by sliding with the window pane at a time of moving up or down the window pane
Data Source
AI summary
A glass run channel includes a lip portion in which a bending point is located on a root side of the lip portion. At the bending point, the lip portion is bent when the lip portion is elastically deformed by sliding with a window pane. A first covering portion having a friction coefficient smaller than that of the lip portion is formed on a distal end side of the lip portion with respect to the bending point. A second covering portion having a friction coefficient smaller than that of the lip portion is formed over a surface of a visible portion from the bending point of the lip portion or a position of the lip portion on the distal end side with respect to the bending point. The first covering portion is formed to be harder than the second covering portion.