Flexible Planet Gear Pins for Load-Balanced Epicyclic Gearboxes
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Solution Overview
Problem
Planetary gearboxes experience deformation and uneven wear due to operational forces, leading to reduced lifespan and increased maintenance costs.
Innovation Solution
The epicyclic gearbox design incorporates pins with notches and flexible sleeves that allow for cantilevered portions and non-self-aligning roller bearing assemblies, enabling the gearbox components to flex and maintain alignment under load, thereby distributing forces evenly and increasing load-carrying capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid pins and roller bearing assemblies are used in planet gears, then the gearbox structure is simple and easy to manufacture, but the components experience deformation and uneven wear under operational forces, reducing lifespan
Solution Approach 1:
The pin structure is transformed from rigid to flexible by incorporating a notch that allows controlled deformation. The sleeve is designed with a cantilevered portion that can flex under load, enabling the connection between carrier and planet gear to dynamically adapt to operational forces rather than remaining static and rigid.
Solution Approach 2:
The mechanical properties of the pin-sleeve connection are changed by introducing flexibility through the notch and cantilevered design. This allows the stiffness and deformation characteristics of the connection to change under different load conditions, optimizing performance across varying operational parameters.
2Reliability
If traditional rigid roller bearing assemblies are used, then the gearbox is compact and simple, but forces are not distributed evenly, causing uneven wear on planet pinion gears and sun or ring gears
Solution Approach 1:
The roller bearing assembly is made dynamically adjustable through the flexible sleeve connection. As the sleeve flexes under varying loads, the bearing assembly can shift position to optimize force distribution, preventing concentrated wear patterns that occur with rigid fixed-position bearings.
Solution Approach 2:
The flexibility is localized to specific portions of the sleeve (cantilevered portion) rather than the entire structure. This allows the bearing assembly to have controlled movement capability where needed while maintaining structural integrity and compactness in other areas.
3Strength
If flexible pins with notches and cantilevered sleeves are implemented, then load-carrying capacity increases and wear is reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The pin-sleeve-bearing-planet gear system is segmented into distinct functional portions: the rigid pin body, the flexible notched section, the cantilevered sleeve portion, and the bearing assembly. This segmentation allows each portion to be optimized and manufactured separately using appropriate processes, then assembled into the complete flexible connection system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the load-carrying capacity of the gearbox, reduces wear, and results in a more compact and lighter gearbox with improved operational efficiency and reduced maintenance costs.
Implementation Method 1
a sleeve mounted on the at least one pin and having a free end overhanging the notch to define a cantilevered portion
Data Source
AI summary
An epicyclic gearbox that includes a sun gear, a ring gear, and a plurality of planet gears. The planet gears rotatably couple to the ring gear and the sun gear. Pins coupled to or formed as part of a carrier extend into the planet gears. A sleeve overhangs a notch defined, in part, by at least one of the pins. The pins, the carrier, the sleeve, or any combination of one or more of the pins, the carrier, or the sleeve are capable of flexing.