Windshield Mounting Base With Leaf Spring for Mirror Drop-Off
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Solution Overview
Problem
Rotary-type mounting structures for in-vehicle devices face challenges in balancing support performance and drop-off performance, particularly with the increasing weight and vibration issues of electronic mirrors, where enhancing support strength can interfere with the drop-off action.
Innovation Solution
A rotary-type mounting structure with a support stay and mounting base configuration that includes multiple abutment support portions and a leaf spring mechanism, allowing for enhanced support via biasing force and pressure-abutment, while maintaining efficient drop-off performance through strategic placement and fitting structures that facilitate sliding drop-off without unnecessary complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the number of abutment support portions is increased to enhance support strength, then vibration of the mirror body is reduced, but the drop-off action is interfered with
Solution Approach 1:
The abutment support structure is divided into multiple discrete abutment support portions (first, second, third, and fourth portions) positioned at different locations around the rotation axis. This segmentation allows the support function to be distributed across multiple points, providing adequate support strength while ensuring that not all portions interfere with the drop-off path simultaneously.
Solution Approach 2:
Different abutment support portions are positioned at specific locations with different functional characteristics. The first abutment support portion is positioned to provide primary support, while the second, third, and fourth portions are positioned to provide additional support at strategic locations that do not interfere with the drop-off action. Each portion has optimized local geometry to balance support and drop-off requirements.
2Area of stationary object
If a rotary-type mounting structure is used to avoid space requirements, then space for mounting is saved, but support performance becomes insufficient for heavy electronic mirrors
Solution Approach 1:
The mounting structure transitions from a two-dimensional sliding interface to a three-dimensional rotary interface with multiple abutment support portions distributed around the rotation axis. This dimensional change allows the support function to be achieved through radial distribution of support points, providing enhanced support performance for heavy electronic mirrors while maintaining compact mounting space.
Solution Approach 2:
The mounting structure combines the leaf spring element with multiple rigid abutment support portions to create a composite mounting system. The leaf spring provides elastic support and shock absorption, while the multiple rigid abutment portions provide stable geometric support, together achieving superior support performance for heavy electronic mirrors.
3Strength
If the abutment support portions are positioned to optimize support, then support performance is improved, but the drop-off performance degrades
Solution Approach 1:
The mounting structure is designed to be dynamic rather than static. The leaf spring allows the abutment support portions to move relative to each other during normal operation, and during drop-off, the structure transitions from a supported state to a dropped state. This dynamic design allows the same structure to provide both optimal support and reliable drop-off functionality.
Solution Approach 2:
The abutment support portions are positioned and dimensioned to provide sufficient support strength during normal operation, but their geometry and positioning are specifically designed to allow easy override when drop-off force is applied. The structure preemptively balances the forces required for support versus drop-off, ensuring that drop-off can occur when needed despite the presence of multiple support portions.
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 enhances support performance for in-vehicle devices, particularly electronic mirrors, by distributing load efficiently and preventing vibration, while maintaining the integrity of the drop-off mechanism to ensure safety and functionality.
Implementation Method 1
a support stay abuts against and is supported on a mounting base via a plurality of abutment support portions provided by an abutment support structure disposed around a rotation axis orthogonal to a support stay mounting surface (that is, a surface supporting a mounted surface of the support stay) of the mounting base (that is, a rotation axis for rotary mounting action). The support stay is joined to the mounting base via a leaf spring, and a biasing force of the leaf spring brings each abutment support portion into a pressure-abutment state
Data Source
AI summary
A mounting base is mounted to a windshield surface. A support stay is mounted to the mounting base via a support stay mounting leaf spring by being rotated in a direction around a rotation axis. A support stay mounting surface of the mounting base and a mounted surface of the support stay include abutment support structures. The abutment support structures bring the support stay mounting surface and the mounted surface into abutment with each other via a plurality of abutment support portions surrounding the rotation axis to make the support stay be supported on the mounting base. The abutment support portions include a first abutment support portion disposed in an angle direction toward a lower side of a circumference around the rotation axis with the rotation axis as a center.