Built-In Roller Shade Gear Drive for Smooth Retraction Control
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Solution Overview
Problem
Current spring roller shades face issues with uneven elastic force control, leading to rapid shade movement and complex structures, resulting in high costs and assembly complications due to the direct connection of the coil spring to the winding drum.
Innovation Solution
A built-in roller shade actuation device featuring a gear pair between an actuator and a shaft, with a planetary gear and fixed gear for power transmission, and a plane scroll spring for controlled driving force, allowing for smooth retraction and release of the shade body without the need for coaxial alignment with the winding drum's central axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a coil spring is directly connected to the winding drum to provide elastic force for shade retraction, then the structure is simple, but the elastic force is difficult to control effectively and causes uneven movement
Solution Approach 1:
A damper is introduced as an intermediary component between the coil spring and the winding drum. The damper mediates the force transmission, controlling the elastic force output to achieve uniform shade retraction speed while maintaining the simple spring-based structure.
Solution Approach 2:
The damper's damping coefficient is adjusted to optimize the control of elastic force. By changing the damping parameter, the system achieves balanced force control that prevents rapid shade movement while maintaining structural simplicity.
2Reliability
If a damper is added to control the elastic force release speed, then the shade body movement is controlled, but the structure becomes complicated and costs increase
Solution Approach 1:
The damper is designed to perform multiple functions: controlling elastic force release, regulating shade retraction speed, and preventing rapid movement. This multi-functionality reduces the need for additional components, thereby limiting structural complexity increase.
3Power
If the coil spring is fully deformed during operation to provide sufficient elastic force, then the retraction power is sufficient, but the elastic force becomes difficult to control and causes rapid shade rise
Solution Approach 1:
The system transitions from static spring deformation to dynamic force control. The damper dynamically adjusts the force transmission based on the spring's deformation state, maintaining sufficient retraction power while preventing uncontrolled rapid movement through real-time force modulation.
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 solution provides a simple, efficient, and stable power transmission system with high transmission efficiency, reducing the complexity and cost of the actuation device while allowing for precise control of the driving force for shade movement.
Implementation Method 1
an actuator assembled in the winding drum for providing a rotation power... a plane scroll spring, the plane scroll spring and the output shaft are axially parallel
Implementation Method 2
a gear pair mounted between the actuator and the shaft for realizing power transmission. The gear pair includes a planetary gear mounted to an output shaft of the actuator, and a fixed gear mounted to the shaft
Implementation Method 3
a spring end, a coil spring, a damper, and a limiter are arranged in order from an end to an opposite end in the winding drum... by means of the damper, the shade body can be held at any height position
Data Source
AI summary
A built-in roller shade actuation device for actuating a winding drum with opposite ends rotatably mounted to corresponding frames and an outer side mounted with an end of a shade body includes an actuator assembled in the winding drum for providing a rotation power, a shaft mounted to one of the frames outside an end of the winding drum and inserted into the winding drum, and a gear pair mounted between the actuator and the shaft for realizing power transmission. A shell of the actuator and the winding drum are relatively fixed in a circumferential direction. The gear pair includes a planetary gear mounted to an output shaft of the actuator, and a fixed gear mounted to the shaft and coaxial with the winding drum. The planetary gear revolves around the fixed gear while being driven to rotate by the output shaft of the actuator.