Balancer Casing Structure for Low-Stress Rotary Support
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Solution Overview
Problem
Existing balancer units for rotating machine elements face challenges in reducing size and weight while minimizing stress concentration at the casing, which can lead to deformation and damage.
Innovation Solution
A balancer unit design featuring a casing with inwardly projecting shaft receiving parts that support rotational movement, reducing stress concentration and allowing for thinner, lighter construction by enabling relative rotation of the casing and support shafts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the casing thickness is reduced to decrease size and weight, then the balancer unit becomes more compact and lighter, but stress concentration occurs on the casing causing deformation and damage
Solution Approach 1:
The casing is segmented into multiple functional parts: a peripheral wall, an inwardly projecting shaft receiving part, and a reinforcing rib. This segmentation allows each component to perform its specific function - the shaft receiving part supports rotational movement while the reinforcing rib provides structural strength, enabling thin-walled construction without compromising overall casing strength
Solution Approach 2:
The reinforcing rib is strategically positioned at the location where stress concentration is most likely to occur. This local reinforcement provides additional structural support precisely where needed, allowing the rest of the casing wall to be made thinner while maintaining overall strength and preventing deformation
2Volume of moving object
If the casing thickness is reduced to decrease size, then the balancer unit becomes more compact, but stress concentration occurs on the casing causing deformation and damage
Solution Approach 1:
The casing structure is divided into distinct functional segments including the peripheral wall, shaft receiving part, and reinforcing rib. This segmentation enables optimized wall thickness distribution where material is placed only where structurally necessary, reducing overall volume while maintaining strength through strategic reinforcement
Solution Approach 2:
The reinforcing rib provides localized structural support at critical stress points, allowing the majority of the casing wall to be made thinner. This local reinforcement approach reduces overall casing volume while preventing deformation at stress concentration points
3Device complexity
If the support shaft is directly supported by the peripheral wall, then the structure is simpler, but stress concentration occurs causing deformation and damage
Solution Approach 1:
The support function is separated from the peripheral wall by introducing a dedicated shaft receiving part. This segmentation allows the peripheral wall to focus on containing the biasing mechanism while the shaft receiving part specifically handles rotational support, distributing stress more effectively and preventing deformation
Solution Approach 2:
The shaft receiving part acts as an intermediary component between the support shaft and the peripheral wall. It mediates the transmission of rotational forces, protecting the peripheral wall from direct stress concentration while maintaining structural integrity
Data Source
AI summary
A balancer unit includes a biasing mechanism that generates a moment by biasing a rotary element of a machine and a casing that is rotatably supported by the machine with support shafts therebetween, and that accepts the biasing mechanism. The casing has a peripheral wall that surrounds the biasing mechanism and hollow shaft-accepting parts that are provided to the peripheral wall so as to protrude inwardly from the inner peripheral surface of the peripheral wall, and that accept the support shafts in a manner enabling relative rotation.