Door Mirror Housing Layout for Low Vibration and Clear Visibility
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Solution Overview
Problem
Conventional door mirror structures with an electromotive rotational unit face issues of excessive vibrations and hindered visibility due to the large moment applied in the vertical direction and increased longitudinal width, necessitating manual storage which compromises user convenience.
Innovation Solution
The door mirror structure incorporates an electromotive rotational unit positioned at the side door, reducing vertical moments and longitudinal width, with a housing design that avoids obstructing the driver's view, and includes a rotational support axis and cover member to enhance visibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the electromotive rotational unit is stored inside the door-mirror body portion, then the automatic rotation function is achieved, but the vibrations of the mirror during vehicle traveling become improperly large
Solution Approach 1:
The electromotive rotational unit is extracted from the door-mirror body portion and relocated to the side door. This separation removes the source of vibrations from the mirror assembly, eliminating the harmful vibrations while preserving the automatic rotation function through the extended drive shaft connection.
2Extent of automation
If the electromotive rotational unit is stored inside the door-mirror body portion, then the automatic rotation function is achieved, but the longitudinal width of the door-mirror body portion becomes large
Solution Approach 1:
The electromotive rotational unit is extracted from the door-mirror body portion and placed in the side door, significantly reducing the longitudinal width of the mirror assembly. The automatic rotation function is maintained through the extended drive shaft that connects the relocated motor to the mirror base.
3Object-affected harmful factors
If the electromotive rotational unit is removed from the door mirror, then the vibrations are suppressed and visibility is improved, but the door-mirror body portion needs to be stored manually
Solution Approach 1:
The electromotive rotational unit is extracted and relocated to the side door, enabling automatic rotation functionality. This maintains ease of operation by allowing automated mirror storage and retrieval, eliminating the need for manual storage while preserving the benefits of reduced vibrations and improved visibility.
Data Source
AI summary
A door mirror structure comprises a door-mirror body portion, a mirror base having a tip-end portion fixed to the door-mirror body portion, and a drive unit to rotate the door-mirror body portion and the mirror base between a mirror-use position and a mirror-storage position. The drive unit is provided at the side door. The housing of the door-mirror body portion has a shape such that the door-mirror body portion taking the mirror-use position is not positioned in an area between a first imaginary line which connects a middle point between both eyes of a driver and an inner-end portion, in a vehicle width direction, of a rear face of the door-mirror body portion and a second imaginary line which connects the above-described middle point and a front end portion of a door glass.