Planetary Gear Door Lock Mechanism Manual Override
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Solution Overview
Problem
Existing door lock mechanisms, particularly motor-driven locks, fail when the motor or circuit components malfunction, rendering the lock inoperable from the inside and requiring violent disassembly, which increases difficulty and risk.
Innovation Solution
A driving mechanism incorporating a planetary gear assembly and a cage, where the motor is connected to a ring gear, planet gear, and sun gear, allowing the door to be opened or closed even if the motor fails by switching the rotation direction, using a universal joint to connect the cylinder plug, enabling operation through alternative rotation paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a motor-driven lock mechanism is used, then the door lock can be operated automatically, but the entire lock becomes inoperable when the motor fails
Solution Approach 1:
The lock mechanism is divided into two independent operation paths: an automatic motor-driven path and a manual override path. The planetary gear assembly can be driven by either the motor (through the ring gear) or manually (through the sun gear), allowing the system to segment the drive sources and maintain functionality even when one path fails.
Solution Approach 2:
The system changes the operational parameters by switching from motor-driven rotation to manual rotation. When the motor fails, the user can manually rotate the sun gear, which changes the input method while maintaining the same output function through the planetary gear mechanism.
2Device complexity
If a single rotation direction is used for the planetary gear assembly, then the structure is simple, but the door cannot be opened when the motor fails
Solution Approach 1:
The planetary gear assembly is designed with multi-functionality to serve both automatic and manual operation modes. The same gear components (ring gear, planet gears, sun gear) are used in both motor-driven and manual rotation scenarios, making the mechanism universal and adaptable to different input methods without requiring separate mechanisms.
Solution Approach 2:
The system dynamically adapts its operation mode based on the state of the motor. When the motor is functional, it drives the ring gear; when the motor fails, the system transitions to manual rotation of the sun gear. This dynamic flexibility allows the mechanism to maintain functionality under varying conditions without increasing structural complexity.
3Device complexity
If the motor is directly connected to the cylinder plug, then the transmission mechanism is simple, but there is no alternative rotation path when the motor fails
Solution Approach 1:
The planetary gear assembly serves as an intermediary mechanism between the motor and the cylinder plug. Instead of direct connection, the motor drives the ring gear, which transfers motion through the planet gears and sun gear to the cage and ultimately to the cylinder plug. This intermediary structure provides multiple rotation paths and enables manual override capability.
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
This solution allows for safe and efficient operation of the door lock even when the motor fails, reducing the risk of damage and increasing user safety by providing alternative rotation paths to open or close the door.
Implementation Method 1
The planetary gear assembly includes a ring gear, a planet gear, and a sun gear. The planet gear is rotatably connected to the ring gear, and the planet gear is also rotatably connected to the sun gear.
Implementation Method 2
The universal joint is rotatably connected to the cage. The cage has a first rotation direction. The universal joint has a second rotation direction. The first rotation direction intersects the second rotation direction.
Data Source
AI summary
A driving mechanism for a door lock and a door lock are provided. The driving mechanism includes a motor, a planetary gear assembly, and a cage. The planetary gear assembly includes a ring gear, a planet gear, and a sun gear. The motor is rotatably connected to the ring gear. The planet gear is further rotatably connected to the sun gear. The planet gear is connected to the cage. When the sun gear is in a fixed state, the ring gear is driven by the motor to rotate. When the ring gear is in a fixed state, the sun gear, the planet gear, and the cage are configured to cooperate with one another, to make the planet gear rotates relative to the sun gear and the cage rotate.