Compound Planet Gear Layout With Elastic Torque Load Balancing
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Solution Overview
Problem
Existing compound planetary gear arrangements face issues with over-determination, leading to unbalanced load and uneven wear, as well as challenges in shock absorption during transient torque changes, which reduces the service life and increases the size and weight of gearboxes, particularly in applications like wind turbines.
Innovation Solution
A compound planet gear arrangement with a structural body that allows precise positioning of rotational components, featuring a housing with modular components and axial bores for bearing fixation, and a transmission arrangement that enables elastic rotation between primary and secondary planet gears, distributing load evenly and absorbing shock loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If compound planetary gear arrangements are used to achieve high gear ratios in compact space, then the gear ratio and compactness are improved, but over-determination occurs leading to unbalanced load distribution and uneven wear
Solution Approach 1:
The patent introduces elastic elements (springs, rubber buffers) that change the mechanical parameters of the gear system by adding compliance. This allows the system to absorb transient forces and distribute load more evenly across gear components, resolving the over-determination problem while maintaining high gear ratios in compact space.
Solution Approach 2:
The patent uses elastic elements as intermediary components between gear elements. These intermediaries (springs, rubber buffers) act as mediators that absorb shock loads and distribute forces evenly, preventing direct rigid contact that causes uneven wear and load imbalance in compound planetary gear arrangements.
2Manufacturing precision
If rigid gear structures are used to maintain precision, then manufacturing precision is improved, but shock absorption capability deteriorates during transient torque changes
Solution Approach 1:
The patent employs flexible elastic elements (rubber buffers, springs) that provide both flexibility for shock absorption and sufficient rigidity for maintaining gear positioning precision. These flexible components absorb transient torque changes while allowing the gear structure to maintain its precise geometric relationships during normal operation.
3Strength
If larger gear components are used to handle transient forces, then strength is improved, but the weight and volume of the gearbox increase
Solution Approach 1:
The patent incorporates elastic elements (springs, rubber buffers) as beforehand cushioning mechanisms that absorb transient forces before they can cause damage to gear components. This allows the use of optimally sized gear components without excessive weight, as the cushioning elements prevent the need for oversized strength-marginal components.
4Power
If multiple gear components are used to split torque, then torque transmission capability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple gear components into a compound planetary gear arrangement where sun gears, planet gears, and ring gears work together in an integrated structure. This merging of components achieves high torque transmission capability while maintaining a compact and relatively simple overall device structure compared to using multiple separate gear stages.
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 solution enhances the service life and reduces the weight and size of gearboxes while maintaining high gear ratios, allowing for efficient energy transmission and improved durability under varying torque conditions.
Implementation Method 1
The first and second parts are mechanically connected by means of at least one first elastically deformable member which allows a limited relative rotation between the first and second part
Data Source
AI summary
The invention relates generally to compound planet gear arrangements for transmitting torque between two rotating shafts, by splitting the torque into several torque transmitting gear components. The gear arrangements may contain gear shifts arrangement and free-wheel arrangements. The invention also relates to gear wheel arrangements having enhanced torsional compliance capabilities, which gear wheel arrangements advantageously may be used in said compound planet gear arrangements and also at other applications such as at other over-determined systems or where intermittent loads and forces occur. According to one aspect, the invention relates to a gear wheel arrangement (700, 800, 900), comprising; a first part (710, 810, 910) which is arranged to be rotationally fixed to a shaft; a second part (720, 820, 920) which is rotatably connected to the first part and provided with gear teeth for meshing with an adjacent gear. The first and second parts are mechanically connected by means of at least one first elastically deformable member (750, 850, 950) which allows a limited relative rotation between the first and second part. The gear teeth (721, 821, 921) of the second part (710, 810, 910) are helical and the gear wheel arrangement is arranged to allow a limited relative axial displacement between the first part and the second part.