Reduction Gear Carrier Layout With Fewer Pillars Than Crankshafts
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Solution Overview
Problem
The existing reduction gear devices have a complex carrier structure due to equal numbers of crankshafts and pillars, which complicates manufacturing and may lead to structural and cost issues.
Innovation Solution
A reduction gear device design where the number of crankshafts is greater than the number of pillars, with needle roller bearings and optimized through-hole arrangements, simplifying the carrier structure and increasing power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of pillars is equal to the number of crankshafts, then each crankshaft can be held stably, but the carrier structure becomes complex and manufacturing cost increases
Solution Approach 1:
Multiple crankshafts (three crankshafts) are arranged between two pillars, merging the support function of multiple pillars into fewer pillars. The two pillars couple the first and second holding parts while supporting three crankshafts simultaneously, reducing carrier complexity while maintaining stability through optimized geometric arrangement and load distribution.
2Power
If the number of crankshafts is increased relative to pillars, then power transmission capability and contact area increase, but the carrier structure becomes more complex
Solution Approach 1:
The carrier structure optimizes local quality by concentrating support functions in two strategically positioned pillars rather than distributing one pillar per crankshaft. The pillars are positioned to optimally support the three crankshafts, with the holding parts designed to rotatably hold crankshaft ends while the pillars provide structural coupling, achieving high power transmission with reduced complexity through localized optimization.
Data Source
Figure 1
Figure 2
AI summary
To provide a reduction gear device with which the structure of a carrier can be simplified and manufacturing can be proceeded advantageously. The reduction gear device 1 according to this embodiment is provided with: a case 10 having internal teeth 12 on the inner circumference side; an external gear 40 having external teeth 41 to engage with the internal teeth 12; crankshafts 50 configured to oscillate the external gear 40; and a carrier 60 having a first holding part 61 configured to rotatably hold one end parts of the crankshafts 50, a second holding part 62 configured to rotatably hold the other end parts of the crankshafts 50, and one or more pillars 63 configured to couple the first holding part 61 and the second holding part 62 with each other. The crankshafts 50 are arranged between the one or more pillars 63 in the circumferential direction around the central axis of the internal teeth 12 of the case 10.