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Download book Sae Transactions Volume 14, PT. 1

Sae Transactions Volume 14, PT. 1 by Society of Automotive Engineers

Sae Transactions Volume 14, PT. 1
Author: Society of Automotive Engineers
Page Count: 246 pages
Published Date: 06 Mar 2012
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130681710
File size: 30 Mb
File Name: Sae.Transactions.Volume.14,.PT..1.pdf
Download Link: Sae Transactions Volume 14, PT. 1

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...I will also state that for a commercial aviation engine, I would make all main bearing shells % in. thick, instead of 3/16 in., as in the case of the Liberty. The crankshaft main bearing journals are all 2% in. in diameter and the crankpins 2% in. The crankshaft cheeks, as originally designed, were the weakest point, and when we began to get into quantity production, small variations in material and heat-treatment occasionally resulted in a broken shaft, sometimes within a few hours and sometimes after from 50 to 100 hr. use. It was, of course, impossible to make the cheeks any thicker, and it was, therefore, decided to widen them to take the shape shown in Fig. 4. So far as I am aware, no crankshafts of the revised design were ever broken, with the exception of the occasional shaft that contained a flaw, and these usually let go before the engine had passed its manufacturer's test. It is my belief that the crankshaft as strengthened is an entirely practical and satisfactory design for this type and power of engine. CONNECTING-RODS The designs of connecting-rods and connecting-rod bigend bearings, as originally specified, were on the light side, and while the connecting-rods themselves would stand up indefinitely, if made out of the best material with the best heat-treatment, the least variation would result in trouble. It was, therefore, decided to thicken all sections about 1/32 in., and while this added weight to the engine, it made a thoroughly practical manufacturing proposition. One of the sources of trouble with the original design was sharp corners under the connecting-rod bolt heads, and these were generously filleted in the redesign. The trouble with the connecting-rod bearings was that they were too thin, with the result that they went out of sha...

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