Dual-Drive Internal Lock Structure for Power-Off Door Unlocking
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Solution Overview
Problem
Smart locks with no mechanical unlocking function in the inner lock cause issues when the motor is powered off, preventing normal locking or unlocking of the door, leading to poor user experience.
Innovation Solution
A dual-drive internal lock structure with a manual and motorized portion, featuring a fixation shell, rotating shaft, main and auxiliary pinions, and a control board, allowing manual or electric operation of the linkage rod to lock or unlock the door, ensuring functionality even when the motor is off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the inner lock uses only motorized drive, then automation and convenience are improved, but reliability deteriorates when motor power is lost
Solution Approach 1:
The locking system is segmented into two independent drive mechanisms: a motorized portion for automatic locking and a manual portion for mechanical locking. Each portion has its own drive path to the linkage rod, allowing independent operation. When the motor fails, the manual portion remains functional, ensuring reliability while maintaining automation benefits during normal operation.
Solution Approach 2:
The system changes the operational parameter from purely electric (motorized) to a dual-mode system that can switch between electric and mechanical drive. This parameter change allows the system to adapt to different power availability conditions, maintaining reliability across varying operational states.
2Reliability
If a manual portion is added to the inner lock, then reliability is improved, but device complexity increases
Solution Approach 1:
The manual and motorized portions are merged into a single integrated lock structure sharing common components such as the linkage rod, transmission shaft, and housing. This merging approach reduces overall complexity compared to having completely separate systems, while still providing dual-drive functionality for improved reliability.
Solution Approach 2:
The transmission shaft and linkage rod serve dual purposes: they can be driven by the motor through the pinion gear mechanism, or manually rotated by the user. This multi-functionality allows a single mechanical path to handle both automated and manual operation modes, reducing the need for completely separate drive mechanisms.
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
Ensures the door can be locked or unlocked normally regardless of the motor's power status, enhancing user experience and safety by providing a compact and reliable operation.
Implementation Method 1
the auxiliary pinion is installed on the rotating shaft and meshably connected with the main pinion
Implementation Method 2
the rotating shaft is located in the accommodating cavity and is rotatably fitted with the rotating hole
Data Source
AI summary
A dual-drive internal lock structure includes a fixation shell, a manual portion, and a motorized portion, where an accommodating cavity is arranged inside the fixation shell; the manual portion includes a knob and a rotating shaft, the rotating shaft is rotatably installed in the accommodating cavity and has two ends extending to the outside and connected with the knob and the linkage rod; and the motorized portion includes a control board, a motor, a main pinion arranged on the motor, and an auxiliary pinion arranged on the rotating shaft, the control board is electrically connected with the motor, the main pinion meshes with the auxiliary pinion, and the linkage rod can be driven by both the motor and the knob to implement locking and unlocking.