Eddy Current Gearwheel Braking to Reduce First-Gear Shift Jolt
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Solution Overview
Problem
Motorbike transmissions with unsynchronized gears and wet multi-plate clutches experience a shifting jolt when shifting into first gear due to drag torque, causing discomfort and potentially reducing the serviceable life of components.
Innovation Solution
An eddy current brake system is integrated into the transmission gear wheel and clutch device, allowing for non-contact braking of the transmission input shaft via a ferromagnetic region and electrically conductive coil, reducing the shifting jolt by applying a braking torque when engaging the positive-locking connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a wet multi-plate clutch is used to transmit torque, then torque transmission is enabled, but drag torque causes shifting jolt
Solution Approach 1:
The eddy current brake applies a preliminary braking torque to the transmission input shaft before engagement of the positive-locking connection, counteracting the drag torque effect and preventing the shifting jolt that would otherwise occur during gear shifting
2Productivity
If non-synchronized gears are used, then transmission efficiency is improved, but shifting jolt occurs during engagement
Solution Approach 1:
The eddy current brake applies a preliminary braking torque to the transmission input shaft before engagement of the positive-locking connection, counteracting the drag torque effect and preventing the shifting jolt that would otherwise occur during gear shifting
3Object-affected harmful factors
If eddy current brake is integrated, then shifting jolt is reduced, but device complexity increases
Solution Approach 1:
The eddy current brake is integrated into the existing transmission structure by combining the ferromagnetic region with the transmission input shaft and the electrically conductive coil with the clutch device, merging multiple functions into existing components rather than adding separate systems
Solution Approach 2:
The transmission input shaft is given dual functionality by integrating a ferromagnetic region that enables both torque transmission and interaction with the eddy current brake, while the clutch device's electrically conductive coil serves both clutch engagement and braking functions
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 eddy current brake system effectively reduces the shifting jolt during gear changes, enhancing the comfort and longevity of the motorbike transmission components by mitigating the abrupt braking caused by drag torque.
Implementation Method 1
An eddy current brake system is integrated into the transmission gear wheel and clutch device, allowing for non-contact braking of the transmission input shaft via a ferromagnetic region and electrically conductive coil
Data Source
AI summary
A drive system for a motor vehicle includes a separating clutch, a shiftable transmission, a drive machine, and a transmission gear wheel and a clutch device. In a first operating state either the clutch device or the transmission gear wheel is kinematically coupled to the transmission input shaft and in a second operating state both said clutch device and said transmission gear wheel are kinematically coupled in said manner thereto. The drive system comprises a braking device for transmitting a braking force in a non-contact manner in this first operating state from a first part to a second part of the braking device. In that the first part of the braking device is kinematically coupleable to the transmission input shaft and the second part is kinematically coupleable to the transmission gear wheel.