Cross-Shaped Boss for Vehicle Side Mirror Mounting
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Solution Overview
Problem
Existing side mirror mounting methods face inefficiencies due to reliance on frictional forces for temporary fixing, which can be easily dislodged by shocks, and require oblique insertion of engagement claws, decreasing working efficiency.
Innovation Solution
A cross-shaped boss with a groove is used for temporary fixing, allowing the side mirror to be inserted straight into a circular hole on the door panel, providing a secure grip without frictional forces and reducing the risk of dislodgment, while also facilitating accurate positioning and easy screw tightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rib structure is used for temporary fixing by frictional force, then the side mirror can be temporarily held, but a large pushing force is required and the fixing is easily dislodged by shocks
Solution Approach 1:
The boss is segmented into multiple insertion portions (first, second, third, fourth insertion portions) with different groove configurations. Each insertion portion has grooves at different positions and orientations, allowing the operator to select the most suitable insertion direction based on the circular hole orientation, thereby reducing the required pushing force and improving temporary fixing stability.
Solution Approach 2:
The boss employs an asymmetric groove distribution pattern where grooves are positioned at different locations on different insertion portions. This asymmetric design allows the boss to be inserted from multiple directions with optimized groove engagement, reducing the force required for insertion while ensuring reliable temporary fixing that resists shock-induced dislodgment.
2Reliability
If an engagement claw is formed on a standard boss, then temporary fixing can be achieved, but the boss must be inserted from an oblique direction requiring inclination of the side mirror
Solution Approach 1:
The boss is divided into multiple insertion portions, each capable of being inserted from a different direction. This segmentation eliminates the need for oblique insertion by allowing the operator to choose from multiple straight-insertion options, thereby improving ease of operation while maintaining temporary fixing capability.
Solution Approach 2:
The boss is designed with multi-functionality by providing multiple insertion portions with grooves that can engage with the circular hole from different directions. This universal design allows the same boss structure to accommodate various insertion orientations without requiring inclination of the side mirror, simplifying the installation operation.
3Measurement precision
If a cross-shaped boss is used with diameter nearly equal to circular hole, then positioning accuracy is improved, but the boss structure becomes more complex
Solution Approach 1:
The cross-shaped boss is segmented into four insertion portions, each with strategically placed grooves. This segmentation provides multiple insertion options that maintain positioning accuracy while simplifying the overall structure by using a regular cross-shaped geometry rather than a more complex asymmetric design.
Solution Approach 2:
While the overall boss structure is symmetric (cross-shaped), the groove positions are asymmetrically distributed across different insertion portions. This combination of symmetric geometry with asymmetric groove placement achieves both positioning accuracy and operational ease without excessive structural complexity.
Data Source
AI summary
A side mirror 14 which improves a working efficiency for mounting. The side mirror 14 mounted on a door panel 12 of a vehicle body includes a mirror 22, an external body 24 for housing and holding the mirror 22, and a mounting base 26 for supporting the external body 24; the door panel 12 has a circular hole 30 for positioning the mounting base 26; the mounting base 26 is a cross-shaped boss 32 of which section perpendicular to an axis direction is a cross-shape, a diameter of the section being nearly equal to that of the circular hole 30, and has a cross-shaped boss 32 to be inserted into the circular hole 30 of the door panel 12; the cross-shaped boss 32 has a groove extending in a direction approximately perpendicular to the axis direction on one of four side surfaces which envelop cross-shaped four ends along the axis direction respectively, and when the cross-shaped boss is inserted into the circular hole, the side mirror is temporarily fixed on the door panel by engaging a part of the inner wall of the circular hole with the groove.