Bearing and unloader assembly for compressors

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Solution Overview

Problem

Scroll compressors experience driveshaft deflection due to applied loads, leading to bearing wear and potential compressor failure, which affects the efficiency and longevity of climate-control systems.

Innovation Solution

Incorporating an unloader within a recess on the driveshaft that provides compliance between the driveshaft and bearing assemblies, allowing for pivotable engagement with the bearing, reducing deflection-induced loads.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the driveshaft is made rigid to maintain structural stability, then structural stability is improved, but bearing wear increases due to deflection-induced loads

Engineering Contradiction:

Improvestructural stabilityVSAvoidbearing wear

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The unloader is designed to be pivotable within the recess of the driveshaft, allowing it to dynamically adjust its position in response to driveshaft deflection. This dynamic capability enables the unloader to maintain optimal engagement with the bearing assembly while accommodating rigid driveshaft structures, thereby reducing bearing wear without compromising structural stability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The unloader acts as an intermediary element between the rigid driveshaft and the bearing assembly. By being received within a recess and pivotable relative to the driveshaft, the unloader mediates the interaction between these two components, reducing the transmission of deflection-induced loads to the bearing while maintaining the structural integrity of the driveshaft.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the unloader is made pivotable within the recess to reduce bearing wear, then bearing wear is reduced, but device complexity increases

Engineering Contradiction:

Improvebearing wearVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The unloader assembly is segmented into distinct functional elements: the unloader body received within the recess, the pivotable connection mechanism, and the engagement interface with the bearing assembly. This segmentation allows each component to perform its specific function independently, simplifying the overall design while achieving the goal of reducing bearing wear through pivotable engagement.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of making the entire driveshaft or bearing assembly complex and adjustable, the invention inverts the approach by making only the unloader pivotable within a simple recess. This localized inversion of rigidity creates the necessary compliance to reduce bearing wear while keeping the overall device complexity minimal.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS20260055767A1Bearing and unloader assembly for compressors

Publication Date: 2026.02.26 COPELAND LP

AI summary

A bearing system for a compressor including an unloader at least partially received within a recess of a driveshaft. The unloader includes an outer surface that is engaged with a bearing.An inner surface of the unloader is curved such that the unloader is pivotable relative to the driveshaft unload forces on bearing caused by deflection of the driveshaft.