Design of Engine Gear-Driven Mass Balance Unit and NVH Performance Optimization Geely Automotive Research Institute

Format:

Conference/Event

Author/Creator:

Yang, Yang, author.

Contributor:

Shen, Yuan

You, Yi

Zhao, Fuquan

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

Extensive experimental and numerical investigations with respect to mass balance unit (MBU) were reported to improve the vibration and acoustic performance for inline 4-cylinder engine due to unbalanced inherent secondary order inertial forces. Design of gear-driven MBU with two parallel shafts and two gear pairs which was positioned beneath the crankshaft would be described in the paper. For the sake of compact package and reliable design, the driving gear ring of the system was shrink fitted onto the crankweb, and issues such as lubrication, strength, assembly were taken into account during design process. As a result, 93.66% of 2nd order mass force balance was achieved and2nd vibration level of engine was decreased remarkably. However, acoustical behavior was deteriorated due to gear impact and rattle at the engagement. Extra efforts were paid to solve the unpleasant noise through internal and external excitation optimizations. In the end thanks to good damping property of the material, applying resin material to two driven gears in the original MBU made amazingly improvement in terms of both sound level and sound quality, and the radiated sound pressure was even lower than the engine without MBU, which also indicated that this smart design complies with engineering requirements for series production

Notes:

Vendor supplied data

Publisher Number:

2012-01-0890

Access Restriction:

Restricted for use by site license