Motorcycle Windshield Link Mechanism for Rattle Suppression
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Solution Overview
Problem
Existing motorcycle screen moving mechanisms are complex and large in size, leading to potential weakening of screen support and rattling during travel, necessitating a simpler and miniaturized structure that maintains strength and stability.
Innovation Solution
A link mechanism with supporting members and a coupling member, where the guide projecting portion slides within guide holes above the line connecting rotation axes, providing vertical screen movement and secure support from two vertically separated points, combined with a screen biasing spring for easy operation and reduced rattling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a complex screen moving mechanism is used, then the screen can be moved, but the structure becomes large and screen supporting strength is weakened
Solution Approach 1:
The screen moving mechanism is divided into independent linkages on the left and right sides, each with its own supporting member and coupling member. This segmentation allows each side to function independently while contributing to the overall screen movement, reducing the complexity and size of the complete mechanism.
Solution Approach 2:
Instead of having the screen directly connected to a complex central mechanism, the invention inverts the approach by using simple linkages that connect the screen to fixed rail brackets through supporting members. The movement is achieved by operating levers on either side that rotate coupling members, simplifying the overall structure while maintaining functionality.
2Device complexity
If the mechanism is reduced in size, then the structure is simplified, but screen supporting strength is weakened and rattling occurs
Solution Approach 1:
The guide holes in the fixed rail brackets are strategically positioned and dimensioned to provide localized support at critical points. The guide projecting portions fit precisely into these guide holes to provide targeted support where needed, ensuring screen stability without requiring a bulky overall structure. This local quality approach maintains strength while minimizing size.
Solution Approach 2:
The mechanism uses a composite structure combining rigid components (fixed rail brackets, supporting members, coupling members) with guided movement interfaces (guide holes and guide projecting portions). This composite approach provides both the necessary strength for screen support and the precision guidance needed to prevent rattling, all within a compact form factor.
3Reliability
If the screen is supported at two vertically separated positions, then rattling is suppressed, but the mechanism becomes more complex
Solution Approach 1:
The left and right supporting members are merged through the coupling member that connects them together. This merging allows both sides to work in unison, providing dual vertical support points that suppress rattling while maintaining a simple and compact overall structure. The coupling member integrates the functions of both sides into a unified mechanism.
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 enables a compact, efficient screen movement system that suppresses rattling and maintains screen stability during travel with reduced operational force, improving both functionality and user experience.
Implementation Method 1
the guide projecting portion slides within the guide hole above the straight line connecting the first and second rotation axes to each other
Implementation Method 2
the coupling member whose two end portions in the longitudinal direction are rotatably coupled to the fixed rail brackets having the guide hole into which the guide projecting portion provided to the supporting member is slidably fitted
Implementation Method 3
a screen biasing spring for biasing the screen upward is provided between at least one of the fixed rail brackets and the coupling member
Data Source
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AI summary
A saddle riding type vehicle comprising a windshield screen (20), an operating lever (24) coupled to at least one of supporting members (22) provided on lateral sides of the screen (20) wherein both end portions in the longitudinal direction of a coupling member (27) extending in a lateral direction are coupled to a pair of left and right fixed rail brackets (23) having a guide hole (35), so as to be rotatable about a first rotation axis (C1), the coupling member (27) is coupled to the supporting members (22) so as to be rotatable about a second rotation axis (C2) disposed in front of the first rotation axis (C1) and a guide projecting portion (46) provided on the at least one of the supporting members (22) above a straight line (L) connecting the rotation axes (C1, C2) to each other, is slidably fitted into the guide hole (35).