Two-Wheeler Gear Shift Mechanism for Continuous Torque Transfer
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Solution Overview
Problem
Existing shift systems for gear units, particularly in two-wheeled vehicles, require interruption of power throughput and torque to perform gear changes, which is undesirable, especially when driving uphill.
Innovation Solution
The shift system utilizes the drive force or torque of the drive shaft to induce relative movement of the switch element relative to the selector shaft, allowing gear changes without load interruption by branching off a portion of the drive power to move the switch element between selected positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional shift system with a stationary hollow shaft and camshaft is used, then the gear unit can be compactly constructed, but power throughput must be interrupted to perform gear changes
Solution Approach 1:
The invention transforms the stationary camshaft into a rotating camshaft that rotates together with the drive shaft. This dynamic configuration allows the gear shifting mechanism to operate continuously without interrupting power throughput, as the camshaft's rotation is synchronized with the drive shaft rather than being stationary relative to the frame
Solution Approach 2:
The invention merges the camshaft's rotational movement with the drive shaft's rotation by making them rotate together as a unified system. This combination eliminates the need for separate power interruption mechanisms and allows gear changes to occur during continuous power transmission
2Ease of operation
If the camshaft is rotated by a rider via a rotation activator, then gear changes can be achieved, but sufficient force is unavailable when under load such as uphill driving
Solution Approach 1:
The system uses the drive shaft's own rotational movement to drive the camshaft, allowing the gear shifting mechanism to utilize the existing drive force rather than requiring additional rider input force. The camshaft rotates automatically as part of the drive system, eliminating the need for separate force application by the rider
3Adaptability or versatility
If the switch element is disconnectable from the gear unit component, then gear changes can be performed, but power throughput interruption occurs which is unwanted under load
Solution Approach 1:
The invention maintains continuous power throughput during gear changes by keeping the drive shaft and camshaft rotating together throughout the shifting process. The switch element can change its engagement state with the gear unit component while the power transmission remains uninterrupted, as the camshaft's rotation continues without pause
Data Source
AI summary
A shift system for shifting a gear unit has at least one movably disposed selector shaft and at least one switch element. The selected position of the switch element is changed by movement of the selector shaft relative to the switch element. A drive shaft is rotatable about a center axis. In a first selected position of the switch element, it can be connected to co-rotate at least in one direction of rotation to a component of the gear unit. In a second selected position of the switch element, it can be disconnectable from the component of the gear unit in each direction of rotation. At least a part of the switch element co-rotates with a rotation of the drive shaft about the center axis, so that relative movement of the switch element with respect to the selector shaft is generated. A gear unit has such a switch system.