Propeller Shaft Balance Piece Placement to Prevent Spline Deformation
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Solution Overview
Problem
Conventional power transmission shafts face challenges in correcting imbalance due to deformation of the spline sliding part caused by heat during welding, which complicates vibration reduction and imbalance correction.
Innovation Solution
A weight member is welded to the outer periphery of a sliding unit body between the first boot end and the joint in the direction of the rotational axis, reducing heat-induced deformation and facilitating imbalance correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a weight member is welded to the first connection tube to correct imbalance, then imbalance correction is achieved, but the spline sliding part is deformed by heat from welding
Solution Approach 1:
The patent introduces an intermediary structure (the sliding unit body with its cylindrical outer peripheral surface) that serves as a dedicated mounting location for the weight member. This intermediary structure is positioned away from the spline sliding part, allowing the weight member to be mounted without directly heating or deforming the spline sliding part, thus mediating between the need for imbalance correction and the need to preserve spline sliding part integrity
Solution Approach 2:
The patent segments the mounting location for the weight member from the spline sliding part by placing it on the sliding unit body instead of the first connection tube. This spatial segmentation separates the thermal influence zone of the welding operation from the spline sliding part, allowing independent optimization of both components without mutual interference
2Manufacturing precision
If the weight member is mounted on the first connection tube, then imbalance can be corrected, but heat from welding causes deformation that creates additional imbalance
Solution Approach 1:
The sliding unit body acts as an intermediary mounting platform that decouples the weight member from the first connection tube. This intermediary structure absorbs the thermal impact of welding, preventing heat transfer to the spline sliding part and ensuring that the balance correction achieved through the weight member is not compromised by subsequent thermal deformation
Solution Approach 2:
The patent positions the weight member on the sliding unit body in a location that is predetermined to be away from the spline sliding part. This preliminary positioning ensures that when welding is performed to attach the weight member, the heat-affected zone does not overlap with the spline sliding part, preventing deformation before it can occur
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 configuration effectively suppresses heat-induced deformation and allows for easier and precise correction of rotational imbalance in the power transmission shaft.
Implementation Method 1
a weight member welded to an outer periphery of a sliding unit body
Data Source
AI summary
A propeller shaft (PS) has a balance piece (9) on the outer peripheral side of a stub shaft body section (31) of a stub shaft (3), which is axially separated from both spline sections (25, 34), which are spline fitting sections. Due to this configuration, changes in the gap in both spline sections (25, 34) when the balance piece (9) is welded are minimized, and the occurrence of new rotational imbalance can be minimized. As a result, rotational imbalance in the propeller shaft (PS) due to the balance piece (9) can be corrected appropriately and easily.