Vehicle Door Mirror Load Balancing for Uniform Tilt Rotation
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Solution Overview
Problem
The existing visual recognition devices for vehicles face a challenge in reducing the difference in load required to rotate the mirror body upwards versus downwards, leading to uneven movement and potential issues with motor efficiency and noise.
Innovation Solution
A visual recognition device with a supporting body and a rotationally moving body, where the urging force is adjusted by a mechanism to decrease when moving upwards and increase when moving downwards, ensuring balanced load application across the rotational axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motor is used to rotationally move the base component and mirror main body, then the mirror can be moved towards upper and lower sides, but the load required to move towards upper side is greater than towards lower side
Solution Approach 1:
The patent applies a spring mechanism that acts as a counterweight to balance the gravitational force on the mirror assembly. The spring is positioned and pre-loaded to provide an upward urging force that compensates for the weight of the base component and mirror main body, thereby reducing the load difference between upward and downward movement and enabling more uniform motor operation.
Solution Approach 2:
The patent modifies the mechanical parameters of the system by introducing a spring with specific elastic properties. The spring constant and pre-compression force are selected to adjust the net force characteristics of the system, transforming the asymmetric load condition into a more balanced state where the motor experiences comparable resistance in both upward and downward directions.
2Ease of operation
If the urging force is decreased when moving upwards and increased when moving downwards, then the load difference is reduced, but the urging body mechanism becomes more complex
Solution Approach 1:
The spring mechanism is designed to create an equipotential condition in terms of force balance. By positioning the spring and selecting appropriate pre-load values, the system achieves a state where the net force (gravitational + spring) is approximately equal in magnitude for both upward and downward movements, making the operational potential energy landscape more uniform and reducing the work the motor must perform in each direction.
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 adjustment in urging force reduces the load difference, stabilizes rotational movement, and minimizes changes in motor current and noise, enhancing the operational efficiency and reliability of the device.
Implementation Method 1
an urging body that urges the rotationally moving body, and whose urging force that is applied to the rotationally moving body is decreased when the rotational movement mechanism is rotationally moving the rotationally moving body towards an upper side, and whose urging force that is applied to the rotationally moving body is increased when the rotational movement mechanism is rotationally moving the rotationally moving body towards a lower side
Data Source
AI summary
In a door mirror device for a vehicle, when a driving body is moved rotationally towards an upper side, a gear plate is moved towards a lower side so that urging force applied from a coil spring to the driving body is decreased. In contrast, when the driving body is moved rotationally towards the lower side, the gear plate is moved towards the upper side so that the urging force applied from the coil spring to the driving body is increased. As a result, it is possible to reduce a difference between a load that is applied in order to move the driving body rotationally towards the upper side and the load that is applied in order to move the driving body rotationally towards the lower side.