Triathlon Handlebar Stem Aero Routing and Adjustment
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Solution Overview
Problem
Existing triathlon handlebar assemblies face difficulties in aerodynamic efficiency and convenience during height adjustments due to the need to unthread and rethread wires and brake cables, which increases time and frustration, and the mounting of electronic shifting systems adds to aerodynamic drag and complexity.
Innovation Solution
The handlebar assembly features bolt locations behind the spacer portion to minimize frontal area, includes slots in spacers for wire routing to allow easy spacer adjustments without unthreading wires, and incorporates a cavity for the electronic shifting control box to reduce drag and simplify setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If wires are routed inside the extension spacers to eliminate aerodynamic drag, then aerodynamic efficiency is improved, but adjusting the height of the extension bars becomes difficult and time-consuming
Solution Approach 1:
The extension spacer is divided into two functional parts: an aerodynamic shell that maintains streamlined shape, and an internal adjustment mechanism with a slot that allows wire access. This segmentation enables the aerodynamic exterior to remain intact while providing internal access for wire routing and spacer adjustment without external exposed wires.
Solution Approach 2:
A slot is introduced as an intermediary element within the spacer structure. This slot serves as a mediator that allows the wire to access the adjustment mechanism internally while maintaining the aerodynamic shape of the spacer exterior. The slot enables the wire to be threaded or adjusted without compromising the aerodynamic design.
2Reliability
If brake cable is routed through the stem portion and spacers to reach the front brake caliper, then proper brake function is achieved, but adjusting stem height requires unthreading and rethreading the cable
Solution Approach 1:
The stem height adjustment mechanism is segmented from the brake cable routing path. The spacers contain internal slots or channels that separate the cable routing function from the height adjustment function, allowing height changes without cable manipulation.
Solution Approach 2:
The brake cable is preliminarily routed through designated pathways in the stem and spacers during initial assembly. Pre-formed channels or slots are created that guide the cable along its required path, establishing a fixed routing that eliminates the need for cable unthreading during subsequent height adjustments.
3Adaptability or versatility
If electronic shifting control box is mounted under the stem, then shifting control functionality is achieved, but aerodynamic drag increases and mounting structure becomes complex
Solution Approach 1:
The electronic shifting control box is nested within the hollow interior cavity of the stem portion. This nesting arrangement accommodates the control box inside the existing stem structure, eliminating the need for external mounting brackets or additional support structures. The control box is positioned within the internal volume of the stem, utilizing otherwise wasted space.
Solution Approach 2:
The mounting function and aerodynamic shell function are merged into a single integrated stem structure. The stem portion serves dual purposes: providing structural support for the handlebar assembly and housing the electronic control box. This merging eliminates separate mounting brackets and reduces the number of external components that would increase aerodynamic drag.
Data Source
AI summary
A combination triathlon aero handlebar and stem assembly or handlebar assembly incorporating several innovations is described. Clamp bolt sections for securing the extension bars are located behind a streamlined spacer to reduce frontal area. The design of the extension bar clamps permit tightening and loosening from above through the elbow rest platforms without the removal of the platforms. Streamlined height spacers used to adjust the height of the extension bars include a groove along their trailing edges in which a wire from a electronic shifter can be received. The stem portion of the includes an internal cavity in which the junction box of a electronic shifting system can be received. The streamlined stem height spacers include a path to receive and pass the front brake cable and housing therethrough and include slots that permit the removal and installation of a spacer without disconnecting and unthreading the brake cable.