Planetary Gear Train Transmission Axial Bearing Preload
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Solution Overview
Problem
Current compact rotary transmissions require additional assembly means for axial positioning of bearings, increasing costs and complexity, and are not easily customizable to meet diverse geometrical constraints, making them inefficient in terms of manufacturing and stock management.
Innovation Solution
A planetary gear train transmission design that separates gear ratio function from centering and securing functions, allowing for adjustable axial length and standardized components, enabling reuse of parts across different sizes and reducing the need for multiple stock holdings by using a preassembled subassembly with an annular spacer for bearing preload adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional assembly means are used for axial positioning of bearings, then the transmission can be securely assembled, but the cost price increases and device complexity increases
Solution Approach 1:
The patent combines the axial positioning function with the bearing support structure itself. The outer case includes a shoulder that directly positions the bearing assembly axially, eliminating the need for separate positioning components. This merging of functions reduces device complexity while maintaining secure assembly.
Solution Approach 2:
The outer case serves multiple functions: it houses the planetary gears, provides axial positioning for bearings through its shoulder, and supports the overall structure. This multi-functionality eliminates the need for dedicated positioning components, reducing both complexity and cost.
2Adaptability or versatility
If custom-made transmissions are produced to meet diverse geometrical constraints, then the transmission can be adapted to various transmission lines, but manufacturing rationalization is reduced and cost increases
Solution Approach 1:
The transmission is divided into modular components: a standardized planetary gear train unit and customizable adapter components. The adapter components allow the standardized unit to be adapted to different geometrical constraints without requiring custom manufacturing of the entire transmission, thus maintaining manufacturing rationalization.
Solution Approach 2:
The patent employs adjustable axial length configurations through different bearing arrangements and adapter components. This allows the same standardized planetary gear train to be adapted to various geometrical constraints by changing the axial configuration rather than creating entirely custom designs.
3Adaptability or versatility
If multiple stock holdings are maintained for different transmission sizes, then various sizes can be supplied, but the amount of stock to be held increases and costs increase
Solution Approach 1:
The standardized planetary gear train unit can serve multiple transmission sizes by combining with different adapter components and bearing arrangements. This universality allows a single standardized unit design to fulfill multiple size requirements, reducing the need to maintain separate stock holdings for each size.
Solution Approach 2:
The patent enables reuse of the standardized planetary gear train unit across different applications and sizes. Instead of discarding or maintaining separate units for each size, the same core unit can be recovered and reused with different adapters, reducing overall stock requirements.
Data Source
AI summary
A planetary gear train transmission includes:an outer case fitted with a ring gear having internal teeth;at least one outlet planet carrier having planet gears meshing with the ring gear, and with a central, sun gear;an inlet gear and an inlet bearing provided in the case; andan outlet bearing from the transmission provided in the case;the transmission including an outlet member coupled to rotate with the outlet planet carrier and co-operating with the planet carrier to form elements for preloading the outlet bearing.