Research on Noise Reduction of Linkage Drive Gear in Extended Expansion Linkage Engine

2011-32-0538

11/08/2011

Event
Small Engine Technology Conference & Exposition
Authors Abstract
Content
The authors have reported on a study on extended expansion linkage engine to enhance thermal efficiency since 2006. This report discusses the use of a test engine applied to a Micro Combined Heat and Power Generation Unit for household use, in order to reduce engine noise at a rated operation.
Test engine noise is mainly caused by gear meshing for the multiple linkage system, so helical gear with higher contact ratio than that of spur gear was used. Measurement of engine noise revealed that test engine noise increased by 3.2 dB(A) over compared conventional engine. From results of behavior analysis by mechanical simulation, when transmission direction of the relative torque between the crankshaft and the eccentric shaft is reversed, the direction of the thrust force acting on the gear is reversed. For this reason, the test engine noise increases because each shaft vibrates, and rattle noise occurs. With the aim of reducing rattle noise, it is possible to control axial vibration using hydraulic pressure to act on each shaft ends. As a result, rattle noise is resolved, and the test engine noise achieves same noise level of the conventional engine.
Meta TagsDetails
DOI
https://doi.org/10.4271/2011-32-0538
Pages
10
Citation
Naoe, G., and Tokubi, K., "Research on Noise Reduction of Linkage Drive Gear in Extended Expansion Linkage Engine," SAE Technical Paper 2011-32-0538, 2011, https://doi.org/10.4271/2011-32-0538.
Additional Details
Publisher
Published
Nov 8, 2011
Product Code
2011-32-0538
Content Type
Technical Paper
Language
English