Speed Reducer Machining Accuracy Split for Low Output Shaft Runout
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Solution Overview
Problem
The high precision requirements and assembly accuracy needed for industrial robot speed reducers result in increased manufacturing costs due to complex adjustment processes and high dimension accuracy demands.
Innovation Solution
A manufacturing method for speed reducers that focuses on achieving higher machining accuracy for the first parallelism between the shaft portion's receiving surface and shaft end surface, allowing for simple adjustment at the final step to minimize output shaft runout, while maintaining lower machining accuracy for other surfaces, thereby reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high machining accuracy is applied to all surfaces of the speed reducer components, then the runout precision of the output shaft is improved, but the manufacturing cost and complexity increase significantly
Solution Approach 1:
The patent applies different machining accuracy levels to different surfaces based on their functional requirements. The first receiving surface (contacting the bearing inner ring) is machined with high precision (first machining accuracy), while the second receiving surface (contacting the bearing outer ring) is machined with lower precision (second machining accuracy). This local differentiation of quality resolves the contradiction by concentrating precision machining only where it is functionally necessary for runout control, rather than applying it uniformly across all surfaces.
2Manufacturing precision
If high assembling accuracy is required for all parts, then the runout of the output shaft is minimized, but the manufacturing time and cost increase
Solution Approach 1:
The patent performs preliminary machining of the first receiving surface to high precision before assembly, so that when the bearing is assembled, the high machining accuracy of this surface directly ensures the runout precision of the output shaft. This preliminary action eliminates the need for time-consuming post-assembly adjustments, as the precision is built into the component during manufacturing.
3Manufacturing precision
If complex adjustment processes are implemented, then the manufacturing precision of the speed reducer is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The patent extracts the critical precision requirement from the general assembly process and concentrates it on a specific surface (the first receiving surface). By taking out the runout control function and assigning it to the high-precision machining of this single surface, the patent eliminates the need for complex multi-step adjustment processes during assembly, thereby improving ease of manufacture while maintaining precision.
Data Source
AI summary
The present disclosure relates to a manufacturing method of a speed reducer. The speed reducer includes an outer tube, a shaft portion, an input shaft, a first bearing, a speed reducing portion, and an attachment member. The shaft portion has a first receiving surface and a shaft end surface. The outer tube has a second receiving surface. The first bearing has a first inner ring and a first outer ring. The first receiving surface contacts the first inner ring. The second receiving surface contacts the first outer ring. A first machining accuracy is obtained based on a first parallelism between the first receiving surface and the shaft end surface. A second machining accuracy is obtained based on a second parallelism between the second receiving surface and the flange mounting surface. The manufacturing method includes performing machining such that the first machining accuracy becomes higher than the second machining accuracy.