Vehicular Door Mirror Motor Support Structure
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Solution Overview
Problem
Existing vehicular door mirror devices experience dimensional variations between the motor or worm gear and the gear plate, leading to instability and increased operating noise.
Innovation Solution
A vehicular visual recognition device design that supports the drive means and limit gear radially by a pivoting member, limiting the rotation of the limit gear and transmitting the drive force to pivot the visual recognition means, while maintaining the drive means and gear plate in a stable radial position, reducing dimensional variations and sliding friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor or worm gear and gear plate are supported in a conventional manner, then the door mirror device can be assembled, but dimensional variation occurs between the drive means and gear plate leading to instability and increased operating noise
Solution Approach 1:
A support protrusion is introduced as an intermediary element between the drive means and the gear plate. This protrusion is supported by the case main body and provides a stable reference point that mediates the connection between the motor/worm gear assembly and the gear plate, thereby reducing dimensional variation and improving stability without requiring tighter manufacturing tolerances on the main components
Solution Approach 2:
The support structure is designed to maintain a substantially constant distance between the support protrusion and the gear plate throughout operation. By controlling and maintaining this dimensional parameter within a predetermined range, the system achieves stable operation and reduced noise while accommodating normal manufacturing variations
2Object-affected harmful factors
If the motor or worm gear and gear plate are supported in a conventional manner, then the door mirror device can be assembled, but operating noise increases due to dimensional variation and instability
Solution Approach 1:
The support protrusion acts as a mediator that stabilizes the relative position between the drive means and gear plate, reducing dimensional variation that causes instability. This stability reduction directly decreases operating noise generated by irregular meshing and vibration, while the support protrusion itself is designed to minimize noise generation through its geometric configuration
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 design stabilizes the dimensional variations between the drive means and limit gear, reduces operating noise, and simplifies manufacturing by maintaining the drive means and gear plate in a stable radial position, enhancing the overall performance and reliability of the retraction mechanism.
Implementation Method 1
a worm gear is coupled to a rotating shaft of the motor, and a lower end section of the worm gear is supported by the case main body in a radial direction
Implementation Method 2
the case main body is pivoted by a drive force generated by the motor being transmitted to the gear plate via the worm gear
Data Source
AI summary
In a vehicular door mirror device, a main body section of a motor is supported by an assembly tube of a case in a horizontal direction, and a gear plate is supported by a support tube of the case in the horizontal direction. Therefore, dimensional variation in the horizontal direction between central axis lines of an output shaft of the motor and the gear plate can be suppressed, and variation in meshing amount of a worm gear of the output shaft and the gear plate, and a worm shaft, can be suppressed.