Electric Folding Mirror Motor Thrust Noise Reduction
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Solution Overview
Problem
Existing electric folding type side view mirrors for vehicles still generate thrust sounds due to the rotational axis of the motor, despite previous attempts to minimize noise through buffer mechanisms.
Innovation Solution
A driving device for electric folding side view mirrors that includes a motor seating part in an upper case, an electric motor, a worm gear, a worm wheel, a lower case with a fixing means, a cap spring, and a cap to absorb thrust sounds by extending the rotational axis beyond the upper case and using a cap spring with a saw-toothed outer peripheral surface for effective sound absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a buffer mechanism is used to minimize noise from the rotational axis, then noise reduction is improved, but thrust sounds are still generated
Solution Approach 1:
A cap spring is introduced as an intermediary component between the rotational axis and the motor cap. The cap spring absorbs thrust sounds generated by the rotational axis through elastic deformation, preventing direct transmission of noise to the motor housing. This mediator converts harmful mechanical vibrations into elastic energy that is gradually dissipated.
Solution Approach 2:
The cap spring is pre-installed in the motor cap to provide cushioning before thrust sounds occur. The spring is positioned to contact the rotational axis in advance, creating a buffer zone that absorbs vibrations and noises before they can propagate through the motor structure to the exterior.
2Object-affected harmful factors
If the rotational axis is extended beyond the upper case to apply pressing action, then thrust sound absorption is improved, but device complexity increases
Solution Approach 1:
The cap spring serves multiple functions simultaneously: it acts as a buffer to absorb thrust sounds, provides structural support for the rotational axis, and enables the pressing action needed for noise reduction. By making the cap spring multi-functional, the patent avoids adding separate components for each function, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent combines the buffer function, support function, and pressing function into a single integrated cap spring component. This merging of functions into one element rather than using separate components for each function reduces the overall complexity of the device while achieving multiple objectives.
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 solution effectively prevents thrust sounds by using a cap spring and cap to absorb operational sounds caused by the rotational axis, providing a buffer mechanism that minimizes noise during the folding and unfolding of the side view mirrors.
Implementation Method 1
a cap spring (14), fixed to the lower case by the fixing means
Data Source
AI summary
The present invention relates to a driving device of an electric folding type side view mirror for a vehicle, comprising: an upper case (30) in which a motor seating part is formed; an electric motor (40), installed inside the upper case (30), for generating rotation power; a worm gear (11) installed at a rotational axis (14) of the electric motor (40); a worm wheel gear (12), connected to the worm gear (11), for transferring the rotation power; a lower case (20) formed with fixing means (21, 22); a cap spring (14) fixed to the lower case (20) by the fixing means (21, 22) and a cap (13), mounted at a top of the cap spring (14), for receiving a lower end of the rotational axis (14).