Vehicle Window Shade Arm Gear Mechanism for Low-Force Drawing
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Solution Overview
Problem
Conventional window shade devices for vehicles require high force to operate due to the contour holding member abutting a pressure spring, leading to poor operability when manually drawn and increased burden on actuators when motorized.
Innovation Solution
A window shade device with a deceleration gear mechanism that allows the arm to change posture, reducing the force required for drawing the shade by meshing gears to transfer rotational movement and change the arm's posture between two positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the contour holding member abuts against the pressure spring to draw the window shade sheet, then the window shade can be drawn, but a large force is required for moving the slide element
Solution Approach 1:
The patent introduces an arm as an intermediary component between the slide element and the window shade sheet. The arm changes its posture from a first position to a second position during the drawing process, acting as a mediator that transforms the motion and reduces the force required. This intermediary mechanism allows the system to overcome the high force requirement by distributing the mechanical work across a longer path and different motion stages.
Solution Approach 2:
The arm is designed to dynamically change its posture during operation, transitioning from a first posture when the window shade is retracted to a second posture when the window shade is drawn. This dynamic adjustment allows the system to optimize force application at different stages of the drawing process, reducing the peak force required compared to a static mechanism.
2Power
If the contour holding member abuts against the pressure spring to draw the window shade sheet, then the window shade can be drawn, but a heavy burden is imposed on the actuator
Solution Approach 1:
The arm serves as a mechanical intermediary that transforms the actuator's motion into a more efficient drawing action. By changing its posture during the drawing process, the arm multiplies the effective force applied to the window shade sheet, thereby reducing the burden on the actuator while maintaining or improving drawing efficiency.
Solution Approach 2:
The dynamic posture change of the arm during operation allows the system to optimize the mechanical advantage at different stages of the drawing process. This dynamic adjustment ensures that the actuator operates within a more favorable force range, reducing its burden while maintaining productive drawing performance.
3Ease of operation
If a deceleration gear mechanism is added to reduce the force required for arm posture change, then operability improves, but device complexity increases
Solution Approach 1:
The deceleration gear mechanism acts as an intermediary device between the actuator and the arm, providing mechanical advantage through gear reduction. This intermediary mechanism translates the actuator's rotation into reduced-speed, higher-torque motion that facilitates smooth arm posture changes, thereby improving operability despite the added complexity.
Solution Approach 2:
The patent replaces a purely mechanical linkage system with a gear-based mechanical substitution. The deceleration gear mechanism uses rotational motion and gear ratios to achieve the desired force reduction, substituting a complex multi-link mechanical system with a more compact and controllable gear-driven system.
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
Enables the arm to change posture with reduced force, improving operability and reducing the burden on actuators, allowing for smoother and more efficient shade operation.
Implementation Method 1
a first gear is provided to the arm and a second gear is provided to at least a part of the guide path, and the window shade device for vehicles further includes a deceleration gear mechanism that is provided so as to mesh with each of the first gear and the second gear, and decelerates and transfers, upon meshing with the first gear, a rotational movement by meshing with the second gear as a rotational movement for causing the arm to change the posture thereof
Data Source
AI summary
A window shade device includes a windup device that winds up a window shade to be drawn/housed, a guide and support mechanism that includes a guide rail including a guide path and a movable member configured to move along the guide rail, and an arm that is coupled to the window shade and is supported by the movable member so as to change its posture. A first gear is provided to the arm, and a second gear is provided to at least a part of the guide path. A deceleration gear mechanism configured to mesh with the first gear and the second gear decelerates and transfers the rotational movement upon meshing with the second gear as the rotational movement for causing the arm to change its posture upon meshing with the first gear.