Roller Shutter Drive Coupling for Quiet Offset-Shaft Assembly
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Solution Overview
Problem
Current roller shutter driving devices face assembly difficulties due to misalignment between the output shaft and the shaft, and generate noise due to gear-based power transmission.
Innovation Solution
A roller shutter driving apparatus with a two-stage universal joint and non-coaxial shafts, utilizing non-circular cross-sections and a limit bracket to facilitate assembly and power transmission without gears, reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a gear transmission mechanism is used for power transmission, then power transmission is achieved, but noise is generated during operation
Solution Approach 1:
The patent replaces the gear transmission mechanism with a universal joint coupling system. The universal joint allows for flexible power transmission between non-coaxial shafts without the use of gears, thereby eliminating the noise generated by gear meshing while maintaining effective power transmission capability.
2Device complexity
If the output shaft is offset from the shaft axis, then the driver structure is simplified, but assembly difficulty increases due to misalignment
Solution Approach 1:
The patent introduces a universal joint as an intermediary coupling mechanism between the offset output shaft and the shaft axis. The universal joint accommodates the non-coaxial arrangement and enables proper power transmission, while the parallel arrangement of shaft axes with preset spacing simplifies the alignment process and reduces assembly difficulty.
3Ease of manufacture
If the output shaft and shaft are non-coaxial, then assembly alignment is simplified, but power transmission efficiency may be compromised
Solution Approach 1:
The universal joint serves as an intermediary that efficiently transmits power between non-coaxial shafts. The cross-shaped configuration with four short shafts arranged in 90 degrees allows for effective power transmission while accommodating the non-coaxial arrangement, maintaining transmission efficiency without compromising alignment simplicity.
Data Source
AI summary
A roller shutter driving apparatus includes a shaft fixed to a support frame outside one end of a roller shutter winding drum and inserted into and coaxially arranged with the winding drum, a driver arranged inside the winding drum for driving the winding drum to rotate about the shaft and including a base fixed relative to the winding drum in a circumferential direction and a rotating power member fixed to the base, and a two-stage universal joint arranged between the output shaft and the shaft and including a transmission shaft and two universal joint modules respectively set at opposite ends of the transmission shaft. Central axes of an output shaft of the rotating power member and the shaft are parallel to each other and have a preset non-zero spacing. External ends of the two universal joint modules are fixedly connected to the output shaft and the shaft in one-to-one correspondence.