Nested Roller Shaft Motorization for Space and Torque Limits
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Solution Overview
Problem
Existing solutions for motorizing blackout or mosquito net curtains face challenges with limited space and insufficient torque due to compact motors, and require complex motorization within the roller shutter housing, which is inefficient and often inadequate for larger dimensions.
Innovation Solution
A drive device that independently motorizes a second roller group, such as a blackout or mosquito net, using a larger diameter shaft within the first roller group's housing, allowing for a compact and efficient installation with enhanced torque by housing the motor inside the first shaft and transmitting motion via a belt or chain mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact motor is used to optimize space inside the housing box, then the space utilization is improved, but the output torque becomes insufficient to rotate the shaft
Solution Approach 1:
The patent places the motor inside the hollow interior of the shaft, nesting one component within another. This allows the motor to be positioned within the existing structural space of the shaft without requiring additional external housing volume, thereby maintaining compact overall dimensions while providing sufficient torque through proper motor sizing within the nested configuration
Solution Approach 2:
The patent utilizes the longitudinal dimension of the shaft by extending it to accommodate the motor within its hollow interior. This dimensional approach allows the motor to be positioned along the length of the shaft rather than requiring radial space, effectively using the available volume in a different spatial arrangement to achieve both compactness and adequate torque output
2Force
If a larger motor is used to provide sufficient output torque, then the torque capability is improved, but the dimensions exceed the available space inside the shaft and housing box
Solution Approach 1:
The motor is nested within the hollow interior of the shaft, allowing a larger motor with sufficient torque capability to be positioned within the existing structural envelope. This nesting arrangement eliminates the need for additional external space while accommodating a motor sized appropriately for the required torque output
3Adaptability or versatility
If a dedicated motor is mounted inside the shaft for the second roller group, then the motorization functionality is improved, but the installation complexity increases due to space constraints
Solution Approach 1:
The shaft is designed with a hollow interior that serves multiple functions: it acts as the structural support for the first roller group, provides the mounting location for the motor, and serves as the housing for the second roller group's winding mechanism. This multi-functionality eliminates the need for separate dedicated housing structures, thereby reducing installation complexity while maintaining full motorization capability
Solution Approach 2:
The patent combines the motor housing, shaft structure, and second roller group housing into a single integrated assembly. The motor is mounted inside the shaft, and the second roller group is wound around the same shaft, merging multiple components into one unified structure that simplifies installation while providing dedicated motorization for both roller groups
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 easy installation and remote control of two roller groups with optimized space usage and sufficient torque, overcoming space and performance limitations of traditional systems.
Implementation Method 1
transmitting motion via a belt or chain mechanism
Implementation Method 2
transmitting motion via a belt or chain mechanism
Data Source
Figure 1
Figure 2~3e
Figure 4a~4b
AI summary
Device (1), to be mounted in correspondence with an installation (300) with a first roller group (3) comprising a tubular winding/unwinding shaft (4) for a roll-up element (5) and with at least one second roller group (30) comprising a further tubular winding/unwinding shaft (30) for a further roll-up element (32), and to be used preferably to drive the movement of said further tubular winding/unwinding shaft (31) of said further roll-up element (32), said drive device (1) being characterized in that it comprises: - a casing (28), preferably tubular in shape, which is configured to be removably inserted inside said tubular shaft (4) of said first roller group (3), - a head (25) which is associated with said casing (28) so as to protrude, at least in part, from one end of the tubular shaft (4) in which the casing (28) is intended to be removably inserted, said head (25) being configured for and/or being intended to be fixed to an external support structure (7), - an actuator (18) which is housed inside said casing (28), - means (24) mounted on said head (25) and/or on said casing (28) and configured to idle support the tubular shaft (4), - a motorized output member (29) projecting from said casing (28) and which is actuated in rotation by said actuator (18), said motorized output member (29) also being configured to project from one end of the tubular shaft (4) in which the casing (28) is intended to be removably inserted and being also configured to be engaged by motion transmission means (50).