Double-step offset axle for adjusting cycle trail and rake
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Solution Overview
Problem
Existing methods for adjusting the trail and rake of a cycle's front wheel axle are complex and require multiple components, lacking a simple, effective solution for altering the handling and steering characteristics.
Innovation Solution
A one-piece double-step offset axle with a large end, center section, and small end, where the center section is offset and housed in pinchable split axle housings at the bottom of the forks, allowing rotation to adjust the front wheel axis relative to the steering stem, thereby altering the cycle's geometry and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If prior art methods (varied offset retrofitted triple clamps, adjustable offset triple clamps, adjustable axle carriers, adjustable stems, adjustable eccentric axles) are used to change trail and rake, then cycle handling adjustments are achieved, but device complexity increases
Solution Approach 1:
The patent combines multiple adjustment functions (trail and rake adjustment) into a single integrated axle component. The axle incorporates both offset and eccentric features in one piece, eliminating the need for separate adjustment mechanisms like adjustable triple clamps or axle carriers, thereby reducing device complexity while maintaining full adjustability
Solution Approach 2:
The single-piece offset axle performs multiple functions simultaneously: it provides structural support, enables trail adjustment through rotation, and enables rake adjustment through the eccentric feature. This multi-functional design replaces what would traditionally require multiple separate components, achieving versatility without proportionally increasing complexity
2Device complexity
If a simple one-piece offset axle is used, then device complexity is reduced, but adjustability range may be limited
Solution Approach 1:
The axle incorporates dynamic adjustment capabilities through its eccentric feature, which allows the effective offset to change as the axle rotates. This dynamic characteristic enables a range of adjustment values from a single component, overcoming the limitation of fixed-geometry simple axles while maintaining structural simplicity
Solution Approach 2:
The eccentric design allows the operational parameters (effective offset distance) to change continuously as the axle rotates to different angular positions. This parameter variation provides multiple adjustment states within a single component, achieving broad adjustability without requiring multiple discrete parts
Data Source
AI summary
A one-piece axle comprised of three cylindrical parallel sections: a large end, a center section, and a small end concentric with the large end. The three sections are separated by an eccentric large step, and an eccentric small step. The center section is located between the two steps and is offset from the large and small ends. The center section locates and supports a front wheel of a cycle. The axle is connected to a first split axle housing and a second split axle housing located at the bottom of each of a first fork and a second fork of a cycle respectively, whereby said housings are pinched to form direct rigid and rotationally secured connections between the respective split axle housings and the large and small ends. The position of the front wheel axis of rotation relative to the forks is adjusted by rotating the axle in the split axle housings before the housings are pinched. The axle allows quick and easy adjustments of the front wheel, affecting cycle steering and handling characteristics.