[Home ] [Archive]   [ فارسی ]  
:: Homepage About Journal Papers Archive Search Register Send Article Contact us ::
:: Volume 48, Issue 48 (10-2017) ::
Vol.48 No. 48 pp. 27-40 Back to browse issues page
EF7 engine flywheel bolted joint design improvement by theoretical and experimental investigations
M. Asadi Taheri , A. Hajiali Mohammadi , S. Alizadehnia
Abstract:   (308 Views)
Bolted joints are of the most importance in engine connections. One of important engine bolted joints is the flywheel-crankshaft connection which transmits the engine output torque. Any failure or loosening of flywheel bolts may result in a catastrophic engine damage due to the fact that this joint is considered as a safety issue because of its location and high rotational speed. The most known failure mechanism of flywheel joint is the “Bolt Loosening” due to joint slippage which starts with micro slip and propagates to macro slip causing surface fretting and preload loss and ends up with fatigue fracture of the bolts. Many factors may cause or jeopardize flywheel bolts failure e.g. surface roughness, friction coefficient at the interface, flywheel pin and bolts clearance, threads pitch, bolt preload and external loads acting on the joint. In this study, besides defining and validation of the transmitted torque in the joint, using the general bolted joints equations and combining general rules of such joints, at first it was shown that it needs basic changes in the joint to avoid slippage completely. Then, by calculating the critical slip and comparing it with the probable joint slippage, it was proved that the joint slippage can be limited to a value lower than the critical slip in order to prevent the rotational loosening of the bolts by designing the flywheel pin hole to a proper value. At the end, the theory was validated by performing three “Engine Over-Speed” tests. 
Keywords: EF7 Engine, Flywheel, Crankshaft, Bolt, Joint
Full-Text [PDF 2222 kb]   (78 Downloads)    
Type of Study: Applied Study | Subject: Failure Analysis and Fault Diagnosis in Powertrain
Add your comments about this article
Your username or Email:

CAPTCHA code


XML   Persian Abstract   Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Asadi Taheri M, Hajiali Mohammadi A, Alizadehnia S. EF7 engine flywheel bolted joint design improvement by theoretical and experimental investigations. JER. 2017; 48 (48) :27-40
URL: http://engineresearch.ir/article-1-615-en.html


Volume 48, Issue 48 (10-2017) Back to browse issues page
فصلنامه تحقیقات موتور The Journal of Engine Research
Persian site map - English site map - Created in 0.05 seconds with 30 queries by YEKTAWEB 3731