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Section 7: Customer Benefits - A Case Study of the PW6000 Project |
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2) Understanding Contact Pattern and Gear Displacement 3) Conventional Methods for Contact Pattern Development 4) A New Method for Contact Pattern Development 5) Developing the Contact Pattern Through Computer Modeling: 6) Duplication of Operating Conditions with Universal Load Testers A Case Study of the PW6000 Project 8) Troubleshooting and Failure Analysis 9) Contact Arrow's Design Engineering Team
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This advanced approach for design and contact pattern development provides numerous customer benefits – foremost among these are the dramatic savings of time and money. An example of
this benefit to the customer was illustrated in Arrow’s involvement Arrow supplied gearing on two locations of the PW6000. The first bevel set - supplied directly to Pratt & Whitney - was used in the Upper Tower Shaft or Power Take Off. The second bevel set was used in the Accessory Gear Box, and was supplied to Hamilton Sundstrand - the manufacturer of the Accessory Gearbox. As this was a new engine, Arrow was called upon to perform both the gear tooth design and the fabrication of these bevel gear sets. As with all jet engine gears, this was a demanding application due to the high degree of gearbox deflections. Faced with the double-edged challenge of both a difficult job and a short lead time, Arrow began work on the project - utilizing the arsenal of design and gear manufacturing tools. The two different
gear sets were
then produced and shipped to Pratt & Whitney and Hamilton Sundstrand
– and here were the results. First of all, a normal timeframe for
developing the desired contact pattern under full load can take up to six
months. After the gears were run in the engine for 75 hours, they were visually inspected. Shown in FIG. 16 is one of the gears. Both contact patterns on the run side and start side were exactly as predicted. This approach saved Pratt & Whitney a significant amount of expense and time. |
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Section 7: Customer Benefits - A Case Study of the PW6000 Project |
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with
the Pratt & Whitney PW6000 Engine project. The details of this project
are presented in the following case study.
Arrow’s
initial development was performed in less than 1 week through computer
modeling techniques - and this initial development required no further
modifications when run under full load during engine tests. And for the actual manufacture of a new gearing
application, the typical timeframe is 22 weeks. Arrow performed this work
in only 12 weeks.