Rotating Shaft Balancing with Snap-On Boot Can Weights
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Solution Overview
Problem
Conventional methods for correcting imbalances in rotating shafts, particularly solid shafts, are costly and inefficient due to the need for bulky balancing elements and alternative welding processes that can weaken the shaft and create additional imbalances.
Innovation Solution
A method and apparatus using a joint assembly with a boot can and balancing elements that are easily attached and detached, utilizing a snap-on or press-fit connection, eliminating the need for welding and minimizing material removal, allowing for precise balancing without compromising shaft durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional welding processes are used to attach balancing elements to the shaft, then the balancing elements can be securely attached, but the shaft is weakened due to the heat affected zone and additional imbalances are created
Solution Approach 1:
The invention separates the shaft from the balancing element attachment system by introducing a boot can as an intermediate component. The balancing elements are attached to the boot can rather than directly to the shaft, segmenting the system to avoid heat-affected weakening of the shaft while maintaining secure attachment through the boot can interface.
Solution Approach 2:
The boot can serves as an intermediary component between the shaft and the balancing elements. It provides a mounting surface for the balancing elements without requiring direct attachment to the shaft, thereby eliminating the heat-affected zone issues while ensuring reliable balancing element positioning.
2Reliability
If material is removed from the outer surface of the shaft to ensure secure attachment of balancing elements, then the attachment security is improved, but additional manufacturing processes and machinery are required which increases costs
Solution Approach 1:
The boot can is pre-formed with attachment features (such as recesses, tabs, or adhesive surfaces) that enable secure balancing element attachment without requiring material removal from the shaft. The preliminary preparation of the boot can eliminates the need for additional shaft machining operations.
3Quantity of substance
If the radial distance from the center of the shaft to the outermost surface of the balancing element is increased, then the amount of balancing element needed is reduced, but the overall size and cost of the balancing element increases
Solution Approach 1:
The invention utilizes the axial dimension by extending the boot can axially to provide a larger attachment surface area for the balancing elements. This allows the balancing elements to be positioned at an optimal radial distance while using the axial length of the boot can to accommodate the attachment geometry, effectively distributing the balancing mass without increasing radial protrusion.
Data Source
AI summary
An apparatus for correcting an imbalance in a rotating shaft and a method for correcting the imbalance in a rotating shaft. The joint assembly includes a first joint member that is drivingly connected to at least a portion of second joint member via one or more torque transmission elements. At least a portion of a first shaft is drivingly connected to at least a portion of a first joint member and at least a portion of a second shaft is drivingly connected to at least a portion of a second end portion of the second joint member. A boot can is connected to at least a portion of a first end portion of the second joint member and one or more balancing elements are attached to at least a portion of the boot can.