Guide Louver Knob Friction Geometry for Smooth Wind Adjustment
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Solution Overview
Problem
The stick-slip phenomenon occurs when the operation knob slides on the continuous end surface of the guide louver due to frictional forces, leading to unstable sliding operations and deteriorated operability.
Innovation Solution
A wind direction adjusting apparatus with an operation knob featuring a friction member that has an elastic compression portion with a shape that gradually decreases in dimension along the sliding direction, generating a controlled frictional force to prevent stick-slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat contact surface of the rubber member slides on the end surface of the guide louver, then frictional force is generated to hold the operation knob, but a stick-slip phenomenon occurs causing unstable sliding operation
Solution Approach 1:
The contact surface of the friction member is designed with a specific tapered shape where the dimension along the sliding direction gradually decreases in the pressing direction. This creates different local contact conditions: the larger contact area provides sufficient friction for holding stability, while the tapered geometry reduces friction buildup that causes stick-slip phenomena, enabling smooth sliding operation.
2Ease of operation
If the rubber member is made soft to improve operation feeling, then friction increases to prevent sticking, but the stick-slip phenomenon is exacerbated
Solution Approach 1:
The friction member is designed with a specific geometric parameter configuration - a tapered shape where the dimension along the sliding direction gradually decreases in the pressing direction. This parameter optimization allows the soft rubber material to provide adequate friction for holding while the tapered geometry prevents excessive friction buildup that would cause stick-slip phenomena during sliding operation.
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 apparatus prevents stick-slip phenomena, ensuring smooth and stable operation of the operation knob, improving the operation feeling and operability.
Implementation Method 1
a friction member that is held in the knob body portion in a state of being in contact with an outer peripheral surface of the guide louver to generate a frictional force with the guide louver
Implementation Method 2
the friction member has elasticity and has at least one compression portion including a portion that is compressed by being pressed against the guide louver
Data Source
AI summary
A wind direction adjusting apparatus of the present invention includes: a case body; at least one guide louver; and an operation knob slidably attached to the guide louver, in which the operation knob includes a knob body portion provided with an insertion portion through which the guide louver is inserted, and a friction member that is held in the knob body portion in a state of being in contact with an outer peripheral surface of the guide louver, the friction member has elasticity and has at least one compression portion including a portion that is compressed by being pressed against the guide louver, and the compression portion has a shape in which a dimension of the compression portion along a sliding direction of the operation knob gradually decreases in a pressing direction against the guide louver.