Single Motor Display Locking and Braking Mechanism
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Solution Overview
Problem
Existing display locking mechanisms for vehicle rear sheet displays require separate motors for locking in the storage position and braking in the use position, leading to size and cost inefficiencies, and are prone to unintended pivoting due to vehicle vibrations when power is off.
Innovation Solution
A display holding mechanism with a single motor that includes a display locking portion, a display braking portion, and a switching member to selectively engage these components, allowing for reliable locking in both positions without simultaneous motor use, thereby reducing apparatus size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking motor and a braking motor are separately required to lock the display in the storage position and brake the display in the use position, then the display can be reliably locked in both positions, but the size and cost of the apparatus increase
Solution Approach 1:
The patent combines the locking motor and braking motor into a single integrated motor unit. The motor shaft directly engages with the locking cam for storage position locking, while the motor housing engages with the brake cam for use position braking. This merging eliminates the need for separate motors, reducing apparatus size and cost while maintaining reliable locking in both positions.
Solution Approach 2:
The single motor performs multiple functions: it acts as both a locking motor (when the motor shaft engages the locking cam) and a braking motor (when the motor housing engages the brake cam). The motor unit is designed to selectively engage different mechanical components based on the display's position, making it a universal actuator for both locking operations.
2Device complexity
If only a braking mechanism is used to prevent display pivoting, then the apparatus size is reduced, but the display may still be inadvertently pivoted from the storage position due to vehicle vibrations when power is off
Solution Approach 1:
The locking cam is designed with a cam surface that, when engaged by the motor shaft, applies a preliminary locking action before the display is fully positioned in the storage location. This preliminary engagement prevents vibrations from inadvertently pivoting the display, as the locking cam mechanically blocks the motor shaft from rotating further, providing proactive stabilization.
3Reliability
If a locking cam with a locking pawl is used to lock the display in the storage position, then the display is securely locked, but an additional locking component increases the device complexity
Solution Approach 1:
The locking cam integrates both the locking function and the braking function into a single component structure. The locking cam works with the motor shaft for storage position locking, while the brake cam (integrated or separate but coordinated) works with the motor housing for use position braking. This merging reduces the number of discrete locking components compared to traditional separate locking and braking 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
The mechanism effectively locks the display in both positions using a single motor, preventing rattling and ensuring reliable operation without increasing size or cost, while maintaining functionality to prevent unintended pivoting.
Implementation Method 1
a braking member that fastens a rotating shaft of a display from outside to brake the display in a use position with a frictional force against the rotating shaft
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A pawl (32a) of a locking lever (32) is inserted into an opening (18a) formed in a display (18) to lock the display (18) in a storage position. A slide lever (34) is connected to a brake portion mounted to a rotating shaft of the display (18), and is moved to brake the display in a use position. A sector gear (30) includes a first rib (30b) that engages the locking lever (32), and a second rib (30c) that engages the slide lever (34). The sector gear (30) is pivoted between a lock position where the sector gear (30) engages the locking lever (32) to lock the display (18) in the storage position, and a braking position where the sector gear (30) engages the slide lever (34) to brake the display (18) in the use position.