CVT Gear Regulation with Roller Locking for Smooth Motorcycle Shifts
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Solution Overview
Problem
Existing continuously variable transmission systems for motorcycles lack the ability to activate and deactivate the gear shift regulation device in both low and high gear conditions, leading to abrupt shifts and potential impact issues during gear changes.
Innovation Solution
A transmission device with a gear shift regulation system that includes special rollers and a locking mechanism, allowing activation in any gear condition and deactivation only in low gear to prevent sudden release impacts, utilizing an actuating device with a control rod, pins, and a slide to manage roller engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the regulation device is activated in high gear condition, then the gear shift curve can be regulated, but sudden release of rollers causes impact during gear shift
Solution Approach 1:
The patent applies preliminary action by requiring the transmission to be in low gear condition (rollers near drive shaft) before the regulation device can be activated. This preliminary positioning of rollers prevents sudden release impacts during deactivation, as the rollers are already in a controlled position near the drive shaft where they can be smoothly reengaged without causing impact during gear shifts.
2Adaptability or versatility
If all rollers participate in half-pulley juxtaposition, then touring set-up is achieved, but sporting set-up cannot be obtained
Solution Approach 1:
The patent applies local quality by differentiating the function of individual rollers. Special rollers (at least one, preferably two out of three) are designated to participate in half-pulley juxtaposition for touring set-up, while the remaining roller(s) are blocked by the regulation device for sporting set-up. This local differentiation allows the transmission to switch between touring and sporting characteristics by selectively controlling which rollers are active, providing adaptability without requiring complete redesign of the roller system.
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
Enables smooth and controlled gear shifts by engaging special rollers only in low gear for a sporting set-up and disengaging them in high gear for a touring set-up, preventing sudden impacts during deactivation.
Implementation Method 1
a locking device comprising a pair of keys movable under the action of centrifugal force between a rearward radial position, next to the axis of rotation X, and a forward radial position
Implementation Method 2
an actuating device comprising an actuating rod axially placed inside the drive shaft 2... an actuating pin placed at the end of this opposite the control end 20a and provided with a radial recess 24
Data Source
AI summary
A continuously variable transmission device (1) for a two-, three- or four-wheel motorcycle comprises a gear shift regulation device provided with a slide (40) axially slidable and suitable to engage special rollers (18) to hold them during the gear shift. A mobile bushing (9) is suitable to influence the slide (40) to cause its translation from a rearward position to a forward limit position to engage the special rollers (18).