On-Vehicle Display Motor Control via Gear Displacement
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Solution Overview
Problem
Conventional on-vehicle display apparatuses face challenges in reducing thickness due to complex power transmission mechanisms and are prone to damage from external forces, which can lead to gear damage and abnormal noise when clutch mechanisms are used to mitigate these issues.
Innovation Solution
The apparatus employs a motor-driven gear train with a threaded rod, a slider, and a spring member, where the gear train includes a first gear and a second gear in recess-protrusion engagement, allowing coaxial rotation and integral movement, and a detection sensor to control the motor based on external forces, preventing damage without the need for a large clutch mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a complex power transmission mechanism with many gears and levers is used, then the display main body can be moved between retracted and raised states, but the configuration becomes complex and the thickness of the apparatus increases
Solution Approach 1:
The power transmission mechanism is segmented into two independent systems: a first lever system for raising the display main body, and a second lever system for retracting it. This segmentation allows each system to be optimized independently, reducing overall complexity while maintaining full functionality.
Solution Approach 2:
The first and second levers are combined in a shared transmission pathway, allowing both raising and retracting operations to use the same motor and transmission components. This merging reduces the number of separate mechanisms needed, thereby reducing apparatus thickness.
2Reliability
If a clutch mechanism is added to the power transmission pathway to prevent damage from external forces, then gear damage is avoided, but the structure becomes larger and thickness increases
Solution Approach 1:
A force sensor is introduced as an intermediary component between the levers and the motor. It detects external forces and triggers appropriate control actions, providing protection without requiring a mechanical clutch mechanism. This mediator approach maintains reliability while keeping the structure compact.
Solution Approach 2:
The mechanical clutch mechanism is replaced with a sensor-based detection and control system. Instead of using mechanical slipping or disengagement to protect against external forces, the system uses electronic detection via the force sensor and相应的 motor control to prevent damage, thereby reducing structural complexity.
3Reliability
If a clutch mechanism is used to block external forces, then gear damage is prevented, but abnormal noise may occur due to clutch plate sliding
Solution Approach 1:
The force sensor acts as an intermediary that detects external forces before they can cause damage or noise. By triggering preventive control actions, the system avoids the need for mechanical clutch engagement that would generate sliding noise, thus eliminating the harmful noise while maintaining protection.
Solution Approach 2:
The potential harmful effect of external forces is converted into a beneficial detection opportunity. The force sensor transforms the harmful external force into useful detection signals that trigger protective control actions, preventing both damage and noise generation in the first place.
4Device complexity
If the thickness of the apparatus is reduced by simplifying the power transmission mechanism, then the apparatus becomes more compact, but protection from external forces becomes insufficient
Solution Approach 1:
The force sensor serves as a protective intermediary that compensates for the simplified mechanism's reduced inherent protection. It detects external forces early and triggers control responses that prevent damage, ensuring reliability is maintained despite the simpler, thinner structure.
Solution Approach 2:
A feedback control loop is implemented where the force sensor continuously monitors external forces and provides feedback to the motor control system. This feedback enables real-time adjustments to prevent damage from external forces, maintaining reliability in the simplified, thinner apparatus structure.
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 configuration enables the apparatus to be easily reduced in thickness while effectively preventing damage from external forces, eliminating the need for a large clutch mechanism and reducing the likelihood of abnormal noise.
Implementation Method 1
a spring member elastically urging the first gear toward the second gear
Implementation Method 2
a threaded rod provided with a helically extending thread groove, a slider screwed to the thread groove and moving back and forth with the rotation of the threaded rod
Implementation Method 3
a detection sensor detecting the size of the external force on the basis of the displacement of the first gear against the spring member in the axial direction
Data Source
AI summary
An on-vehicle display apparatus includes a motor, a gear train, a threaded rod, a slider screwed to the threaded rod, and a display main body rotatably connected to the slider. The lead angle of the threaded rod is set greater than the friction angle thereof. The gear train includes first and second gears facing each other. Protrusions provided on one of the first and second gears are fitted in recesses provided in the other. A spring member elastically urges the first gear toward the second gear. A detection sensor detects the size of an external force on the basis of the displacement of the first gear against the spring member in the axial direction. The motor is controlled on the basis of the detection result of the detection sensor such that the display main body is moved away from the external force.