Horizontal Spindle Damping Cylinder for Variable Friction Torque
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Solution Overview
Problem
Existing mechanical damping devices for roller shades are either expensive and bulky or unsuitable for small window shades due to their complexity, making it difficult to achieve variable damping forces for smooth and steady lowering.
Innovation Solution
A mechanical multiple torque damping device comprising a support module, spindle coupling sleeve, damping cylinder, and tightness regulating module, which generates multiple frictional torques by using an elastomer friction ring and screw shaft to adjust damping forces during the lowering process, allowing for adaptable resistance to control the rotational speed of the horizontal spindle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electronically controlled damping system is used to vary damping force during lowering, then the damping force can be regulated to meet multiple different requirements, but the system becomes expensive and bulky
Solution Approach 1:
The patent replaces the electronic control system with a purely mechanical solution. The damping cylinder with stepped inner frictional surface sections and elastomer friction ring creates multiple frictional torques through mechanical interaction only, eliminating the need for position monitoring, digital output, and electronic regulation components while achieving the same variable damping force effect
Solution Approach 2:
The damping cylinder features inner frictional surface sections with different inner diameters, creating multiple frictional torque levels. As the damping cylinder axially displaces during rotation, different diameter sections contact the elastomer friction ring sequentially, automatically varying the damping force without electronic control based on the rotational position
2Device complexity
If a fixed resisting force damping device is used, then the structure is simple, but the resisting force is too large for the shade to be lowered initially
Solution Approach 1:
The damping device transitions from a static fixed resisting force to a dynamic variable resisting force system. The damping cylinder axially displaces during rotation, causing different diameter sections to contact the friction ring at different stages of the lowering process, automatically adjusting the damping force to be appropriate for each phase of operation
Solution Approach 2:
The inner frictional surface of the damping cylinder is divided into multiple axial sections with different inner diameters. Each section provides a different frictional torque level, creating a segmented damping characteristic that adapts to different lowering stages without requiring a completely different device structure
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 device provides a cost-effective, compact, and easy-to-install solution for varying damping forces, ensuring smooth and steady lowering of roller shades, suitable for various sizes and weights, while preventing rapid vibration and noise.
Implementation Method 1
The inner peripheral surface of the damping cylinder has a plurality of inner frictional surface sections which are formed axially and which have different inner diameters such that the inner frictional surface sections are in frictional contact with the friction ring during axial displacement of the damping cylinder to generate multiple frictional torques
Data Source
AI summary
A mechanical multiple torque damping device includes a support module, a spindle coupling sleeve and a damping cylinder. The support module includes a mounting seat, a tubular support axle extending from the mounting seat, a friction ring sleeved on the support axle, and a screw shaft extending through the support axle. The spindle coupling sleeve is rotatably sleeved on the support axle to support a horizontal spindle. The damping cylinder is axially displaceable along the screw shaft relative to the friction ring during rotation with the horizontal spindle. A cylinder body of the cylinder has inner frictional surface sections in frictional contact with the friction ring to generate multiple frictional torques to the horizontal spindle.