Concealed Door Closer Magnetic Coupling Transmission
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Solution Overview
Problem
Conventional concealed door closers have large size, low transmission efficiency, high precision requirements for mounting, and are prone to damage due to gear mesh connection issues, leading to reduced motor lifespan and measurement errors.
Innovation Solution
A concealed door closer design featuring a gimbal structure with a joining member and safety clutch device, allowing for small size, high efficiency, flexible bending angle adjustment, and contactless angle measurement, along with a safety mechanism to prevent damage from excessive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gear mesh transmission is used to connect input shaft and output shaft, then 90-degree transmission connection is achieved, but the structure becomes large in size
Solution Approach 1:
The patent replaces the traditional gear mesh transmission mechanism with a magnetic coupling transmission system. The input shaft and output shaft are connected through magnetic fields generated by magnets arranged on both shafts, eliminating the need for physical gear mesh contact. This substitution significantly reduces the structural size while maintaining the 90-degree transmission connection capability, directly resolving the contradiction between transmission precision and device size.
2Manufacturing precision
If gear mesh transmission is used, then transmission connection is achieved, but transmission efficiency becomes low
Solution Approach 1:
The patent substitutes mechanical gear mesh contact with magnetic field-based torque transmission. The magnetic coupling system transmits rotational force from the input shaft to the output shaft through magnetic attraction and repulsion forces, eliminating mechanical friction, tooth engagement losses, and sliding friction inherent in gear systems. This results in significantly improved transmission efficiency while maintaining precise 90-degree power transmission.
3Manufacturing precision
If gear mesh connection is used, then transmission is achieved, but high precision in mounting position is required
Solution Approach 1:
The magnetic coupling transmission system replaces the rigid mechanical gear mesh connection with a flexible magnetic field-based transmission. The magnetic coupling allows for greater tolerance in mounting positions and shaft alignment, as the magnetic fields can accommodate slight variations in position without compromising transmission effectiveness. This eliminates the strict 90-degree alignment requirement and reduces mounting precision demands.
4Measurement precision
If contact portion is arranged between output shaft and measurement instrument, then rotation angle measurement is achieved, but measurement errors increase after multiple measurements
Solution Approach 1:
The patent replaces contact-based mechanical measurement with a non-contact measurement system. Optical encoders or magnetic sensors are used to detect the rotation angle of the output shaft without physical contact. This eliminates wear, friction, and positional shifts that occur with repeated contact measurements, ensuring long-term measurement stability and accuracy while maintaining precise rotation angle detection capability.
Data Source
AI summary
A concealed door closer includes a housing, an input shaft and an output shaft, the input shaft being connected to a motor, wherein a joining member is arranged between the input shaft and the output shaft, and two ends of the joining member are respectively provided with an upper connection piece and a lower connection piece, which are connected to a roller via vertical rotation shaft, and wherein both the input shaft and the output shaft are provided with a left connection piece and a right connection piece, which are horizontally connected to the roller via a horizontal rotation shaft. The components in the door closer have a simple structure and may be easily processed and assembled. The size of the joint after assembly is equivalent to that of the joining member, so the overall size is small.