Variable Speed Rotor Shaft Assembly With Horizontal Insertion Jig

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Solution Overview

Problem

The existing manufacturing methods for variable speed accelerators require time-consuming and labor-intensive alignment adjustments of the rotor and shaft, leading to decreased manufacturing efficiency due to the need for a divided rotor structure and complex assembly processes.

Innovation Solution

A method involving a shaft jig that allows for the horizontal insertion of a constant speed shaft into a hollow variable speed rotor, eliminating the need for large-scale alignment adjustments after shaft insertion, and enabling efficient assembly by maintaining the shaft and jig in a horizontal state using suspension portions and counterweights for stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the rotor is taken out from the casing or the shaft is inserted into the rotor in advance, then the alignment adjustment of the shaft can be performed, but the assembly process becomes complex and time-consuming

Engineering Contradiction:

Improvealignment accuracyVSAvoidassembly efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The hollow portion of the rotor is prepared in advance with a horizontal extending structure before assembly. This preliminary preparation allows the shaft to be directly inserted into the pre-positioned hollow portion without requiring the rotor to be disassembled or repositioned, thereby maintaining alignment accuracy while significantly improving assembly efficiency

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A shaft jig is introduced as an intermediary tool to facilitate the insertion of the shaft into the rotor. The shaft jig provides guidance and support during the insertion process, ensuring proper alignment and positioning of the shaft within the hollow portion without requiring complex adjustment procedures

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the rotor is made as a divided structure, then the shaft can be assembled, but the manufacturing complexity increases

Engineering Contradiction:

Improveassembly feasibilityVSAvoidrotor structure complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

Instead of dividing the rotor into separate parts to facilitate shaft assembly, the invention inverts the approach by creating a continuous hollow portion that extends horizontally through the rotor. This allows the shaft to be inserted through the intact rotor structure, eliminating the need for a divided rotor design while maintaining assembly feasibility

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS11777383B2Method for manufacturing variable speed accelerator and method for connecting shaft jig

Publication Date: 2023.10.03 MITSUBISHI HEAVY INDUSTIES COMPRESSOR CORP

AI summary

The present invention provides a method for manufacturing a variable speed accelerator including: a preparation step of preparing a variable speed electric motor 71 including a variable speed rotor 72 in which a shaft insertion hole 74 extending in a horizontal direction is formed, a first variable speed rotor bearing 85i and a second variable speed rotor bearing 85o that rotatably support the variable speed rotor 72 by aligning an axial direction of the variable speed rotor 72 in the horizontal direction, and a variable speed stator 86 that surrounds the variable speed rotor 72 from an outer circumferential side; and a shaft insertion step of inserting a constant speed shaft 77 into the shaft insertion hole 74 of the variable speed rotor 72 in the horizontal direction so as to penetrate the variable speed rotor 72 after the preparation step.