Door Lock Driving Mechanism with Planetary Gear Backup
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Solution Overview
Problem
Existing door lock mechanisms relying solely on motors can fail if the motor or driving mechanism malfunctions, leaving users unable to open or close the door, especially from inside the house, which increases difficulty and risk.
Innovation Solution
A driving mechanism for door locks that incorporates a planet gear assembly, including a gear ring, planet gear, and sun gear, allowing the door to be opened or closed through two methods: motor-driven rotation of the sun gear or direct rotation of the gear ring, even if the motor fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motor-driven mechanism is used for door lock operation, then automation and ease of operation are improved, but reliability deteriorates because the entire system fails when the motor fails
Solution Approach 1:
The transmission system is segmented into two independent pathways: a motor-driven pathway (motor → sun gear → planet gears → holding frame) and a manual pathway (gear ring → planet gears → holding frame). This segmentation allows the door lock to be operated through either pathway, so failure of the motor does not completely disable the system.
Solution Approach 2:
The system changes the operational parameter from purely motor-driven rotation to allowing both motor-driven and manual rotation of the holding frame. By enabling the gear ring to be rotated manually when the motor fails, the system adapts to different operational conditions and maintains functionality.
2Device complexity
If a single motor-driven mechanism is used, then device complexity is reduced, but reliability deteriorates due to lack of backup operation methods
Solution Approach 1:
The planet gear assembly serves multiple functions: it can transmit power from the motor when the motor is functional, and it can also transmit power from manual rotation of the gear ring when the motor fails. This multi-functionality increases reliability without significantly increasing overall system complexity.
Solution Approach 2:
The system dynamically adapts its operation mode based on motor functionality. When the motor works, the sun gear is driven by the motor; when the motor fails, the gear ring can be directly rotated manually. This dynamic switching between operation modes ensures continuous functionality.
3Ease of manufacture
If the motor is the sole driving mechanism, then ease of manufacture is improved, but reliability deteriorates because there is no alternative operation method when motor fails
Solution Approach 1:
The planet gear assembly is nested within the motor-driven mechanism, with the sun gear connected to the motor output and the gear ring surrounding the planet gears. This nested structure allows the manual operation pathway to be integrated within the existing motor-driven structure, adding backup functionality without requiring a completely separate system.
Data Source
AI summary
The present disclosure provides a driving mechanism for a door lock and a door lock. The driving mechanism includes a motor, a planet gear assembly and a holding frame. The planet gear assembly includes a gear ring, a planet gear and a sun gear. The motor is rotatably coupled to the sun gear. The gear ring defines a receiving space. The planet gear and part of the sun gear are received in the receiving space. The planet gear is rotatably coupled between the sun gear and the gear ring. The holding frame is located on one side of the planet gear assembly. The planet gear is coupled to the holding frame. When the gear ring is in an unmovable state, the sun gear is rotated by the motor. When the sun gear is in an unmovable state, the gear ring is controlled to rotate.