Tree Felling Head Gear Assembly Stress Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing gear assemblies in tree felling heads for manipulator arms suffer from high internal and superficial stresses, leading to premature wear and breakage due to significant torque and radial stresses, which increases the weight and reduces maneuverability.
Innovation Solution
A gear assembly design featuring a final gear mounted to a manipulator arm with a bearing-like member, a motor-driven gear train including at least two intermediate gears on either side of the driving gear, which reduces torque and radial stresses by distributing the load across multiple gearing points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If additional gear assemblies including motor and associated driving gears and idler gears are added to reduce stress, then the stress on gear assembly components is reduced, but the weight of the felling head significantly increases
Solution Approach 1:
The gear assembly is segmented into multiple intermediate gears distributed around the final gear, dividing the torque transmission path into multiple segments. This segmentation allows the load to be distributed across multiple gear teeth simultaneously, reducing the stress on any single gear component while maintaining a compact structure without requiring additional heavy motors or gear assemblies.
Solution Approach 2:
The intermediate gears are arranged in a radial pattern around the final gear, utilizing the radial dimension to distribute the driving force. Instead of adding gear assemblies in a linear sequence, the invention distributes gears around the circumference, transforming the torque transmission from a sequential process to a parallel distributed system, thereby reducing stress without proportionally increasing weight.
2Stress or pressure
If gear trains are added to divide forces and reach prescribed limits, then the stress on gear components is reduced, but the device complexity increases
Solution Approach 1:
Multiple intermediate gears are merged into a single integrated gear assembly that rotates together as one unit. The intermediate gears are positioned radially around the final gear and are connected such that they rotate in unison, combining multiple force-dividing functions into a single coordinated mechanism. This merging approach reduces the number of independent components and simplifies the overall structure compared to having separate gear assemblies.
Solution Approach 2:
The intermediate gears are positioned asymmetrically around the final gear at different radial locations, creating an optimized force distribution pattern. This asymmetric arrangement allows each intermediate gear to engage with the final gear at optimal points, maximizing stress reduction efficiency while minimizing the number of components required and simplifying the overall gear assembly design.
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
The design effectively reduces stress on mechanical components, prevents premature wear, and minimizes weight increase, enhancing the durability and efficiency of the tree felling head.
Implementation Method 1
a gear assembly including a final gear, a driving gear, and at least two intermediate gears... the final gear being externally driven
Data Source
AI summary
A gear assembly for a tree felling head having a frame securable to a manipulator arm of a tree cutting carrier, the gear assembly includes a final gear securable to the frame and rotatably engageable over a bearing-like member mounted to the manipulator arm for pivotally mounting the frame to the manipulator arm; and a driving gear generating a torque, the torque of the driving gear being applied to at least two intermediate gears drivingly connected with the final gear.