Integrated Gear Speed Changer Axial Alignment
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Solution Overview
Problem
Conventional gear-type speed changers and motorcycle speed reducers with dog clutches face challenges in achieving accurate axial dimensional alignment of speed change gears, leading to accumulative errors and difficulties in improving assembly precision.
Innovation Solution
The design integrates adjacent speed change gears on the input and output shafts with a dog ring, allowing for axial fixation and rotation, reducing axial displacement and interference during gear cutting, and enhancing torque transmission capacity by using spline and press fittings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If only the first-level speed change gear is provided integrally with the input shaft while remaining gears are provided separately, then the structure is simpler to manufacture individually, but accumulative axial dimensional errors occur during production and assembly
Solution Approach 1:
The patent merges multiple speed change gears (first-level and second-level gears) onto a single input shaft, creating an integrally provided configuration. This combining approach eliminates the separate assembly of individual gears, thereby preventing accumulative axial dimensional errors that would occur through multiple production and assembly steps.
2Ease of manufacture
If multiple speed change gears are provided separately from the input shaft, then manufacturing and assembly of individual gears is easier, but axial dimensional accuracy deteriorates due to accumulative errors
Solution Approach 1:
The patent combines the production of multiple speed change gears into a single integrated manufacturing process where the first-level and second-level gears are provided integrally with the input shaft. This approach sacrifices some individual gear manufacturing flexibility but eliminates the need for multiple assembly operations, thereby ensuring consistent axial dimensional accuracy.
3Manufacturing precision
If speed change gears are provided separately, then the number of components is higher, but axial dimensional accuracy is reduced due to assembly errors
Solution Approach 1:
The patent reduces the number of separate gear components by integrating the first-level and second-level speed change gears onto a single input shaft. This merging of components directly reduces the total quantity of discrete parts while simultaneously improving axial dimensional accuracy by eliminating assembly-related dimensional variations.
4Ease of operation
If dog ring and speed change gears are separately provided, then assembly flexibility is higher, but axial displacement and interference during gear cutting occur
Solution Approach 1:
The patent integrates the speed change gears with the input shaft to eliminate axial displacement issues during gear cutting operations. By providing the gears integrally with the shaft, the axial positioning is inherently controlled, preventing interference during the gear cutting process while maintaining sufficient assembly flexibility through the dog ring mechanism.
Data Source
AI summary
Out of a plurality of speed change gears on one of an input shaft and an output shaft, for example, on the output shaft, two adjacent speed change gears disposed via an axial space therebetween are axially fixed and rotatably fitted around the output shaft. A dog ring for a dog clutch disposed between the speed change gears is fixed around the output shaft and axially slidably fitted thereto. The speed change gears on the output shaft and the dog ring are each provided with an engagement portion for the dog clutch engaged and disengaged by axial shift of the dog ring. The two speed change gears on the input shaft meshing with the two speed change gears on the output shaft are provided integrally with the input shaft.