Motorcycle Handlebar Adjustment via Inverted Crown Slots
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Solution Overview
Problem
Existing motorcycle handlebar adjustment systems face difficulties in accessing the limited working space under the handlebars, leading to reduced efficiency in adjusting the mounting position.
Innovation Solution
The system includes a handle crown with arcuate adjustment slots and tubular handlebars with split portions, allowing for easy adjustment of the handlebars' mounting angle by inserting mounting components through these slots, which are concentric with the fork through-holes, and using high-hardness washers to secure the bolts, enabling smooth and efficient angle adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If handlebars are mounted beneath the fork through-holes with conventional adjustment mechanisms, then the mounting angle can be adjusted, but the working space under the handlebars becomes insufficient and difficult to access
Solution Approach 1:
The patent inverts the conventional adjustment mechanism by moving the adjustment slots from the handlebar brackets to the handle crown itself. The mounting bolts pass through adjustment slots in the handle crown and thread into the handlebars from below, reversing the traditional approach where adjustment mechanisms are located under the handlebars. This inversion provides easy access to the adjustment mechanism from above while maintaining the handlebars beneath the fork through-holes.
2Productivity
If conventional adjustment mechanisms are used with nuts tightened from below, then mounting angle adjustment is possible, but working efficiency is reduced due to difficult access
Solution Approach 1:
The adjustment mechanism is inverted so that the adjustment slots are located in the handle crown and the mounting bolts are accessed from above. The bolts pass through the adjustment slots in the handle crown and thread into threaded holes in the handlebars from below. This allows the adjustment mechanism to be easily accessed from above the handlebars, significantly improving working efficiency and eliminating the need to reach underneath the handlebars for adjustment operations.
3Strength
If standard washers are used with mounting bolts, then the bolts can be tightened, but the handle crown may be damaged during tightening
Solution Approach 1:
The patent specifies using washers with a hardness of 50 HRC or higher for the mounting bolts that pass through the adjustment slots in the handle crown. This parameter change in washer hardness ensures that the washer is harder than the handle crown material, preventing the handle crown from being damaged or deformed during the tightening process. The high-hardness washers protect the handle crown while still allowing proper tightening of the mounting bolts.
Data Source
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AI summary
A motorcycle includes a pair of front forks (5) for supporting a front wheel (6) breadthwise therebetween, a handle crown (18) having a pair of fork through-holes (22) provided at either breadthwise end thereof and coupling both of the front forks (5) at their upper ends, the front forks (5) being inserted through the fork through holes (22), and a matching pair of separate handlebars (38) disposed beneath the fork through-holes (22) and having tubular portions (42) pivotably attached to the front forks (5). The handle crown (18) includes long hole shaped adjustment slots (37) formed therein and penetrating therethrough so as to be concentric with the fork through-holes (22) and the handle crown and the handlebars (38) include threaded portions (46) into which mounting bolts (39) inserted through the adjustment slots (37) are threaded.