Vehicle Mirror Projection Angle Design
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Solution Overview
Problem
Existing vehicle mirror devices face challenges in preventing rotation of the mirror assembly with respect to the base, leading to increased stress on the projection, which can result in damage and higher costs due to the need for high-strength materials or larger projections.
Innovation Solution
A mirror device design that incorporates a support body and a rotating body with an inhibit portion and a projection portion, where the contact faces are inclined to restrict rotation, reducing the distance between the projection base end and the inhibit portion, thereby minimizing the moment acting on the projection and allowing for a lower strength material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the projection is made larger or from high-strength material to prevent rotation damage, then the reliability of the projection is improved, but the weight and cost of the mirror device increase
Solution Approach 1:
The patent applies preliminary action by providing a restricting structure that proactively limits the rotation angle before the projection can experience damaging stresses. The restrict portion prevents the rotating body from rotating beyond a predetermined angle, thereby preventing damage to the projection before it occurs, rather than relying on the projection to withstand large rotational forces.
2Reliability
If the projection is made larger or from high-strength material to prevent rotation damage, then the reliability of the projection is improved, but the cost of the mirror device increases
Solution Approach 1:
The restricting structure is built into the mold during manufacturing, allowing the restrict portion to be formed simultaneously with the projection in a single molding process. This eliminates the need for separate high-strength materials or additional assembly steps, thereby reducing manufacturing cost while ensuring projection durability.
3Strength
If the distance from the projection base end to the contact face is increased to reduce moment, then the stress on the projection is reduced, but the structural complexity increases
Solution Approach 1:
The patent merges the restricting structure with the projection itself, forming an integrated component that performs both support and rotation limitation functions. The restrict portion is formed as part of the projection in a single molding process, eliminating the need for separate components and reducing overall structural complexity while effectively reducing the moment arm.
Data Source
AI summary
In a vehicle door mirror device, by a first fixed-face of a fixed projection of a stay and a first rotating-face of a rotating projection of a drive body contacting, further rotation of a mirror is inhibited when the mirror is disposed in a housed position. A slope-angle of the first fixed-face to the housing direction is smaller than a slope-angle of the first rotating-face to a forward folded direction. Contact between the upper end of the first fixed-face and the first rotating-face can accordingly be restricted, and a distance from the lower end of the first fixed-face to the contact position with the first rotating-face can be made short. So, moment acting on the first fixed-face from the first rotating-face can be made small, enabling damage to the lower end position of the first fixed-face to be suppressed. A reduction in weight and cost can accordingly be achieved.