Lead Mismatch Calculation of a Helical Gear System Mounted on Balance Shafts American Axle and Mfg Incorporated

Format:

Book

Conference/Event

Author/Creator:

Chowdhury, Sanjib, author.

Contributor:

Chung, Jerry

Mehta, Yogesh

Vasu, Anoop

Conference Name:

SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

In powertrain systems, combined deflection of loaded gear tooth as well as that of the shafts on which the gears are mounted are responsible for non-ideal meshing conditions. Uneven load distribution along the teeth between mating gears is one such non-ideal condition that can cause significant NVH issues. Lead mismatch, defined as the amount of mismatch along a pair of gear teeth face, is a critical parameter to maintain uniform load distribution at the gear contact regions. If the adjacent shafts are balance shafts where a counterweight is mounted at an eccentric location, shaft deflection and the resultant lead mismatch is even more. Also, typically, balance shafts are required to rotate at twice the crankshaft speed. At a high engine speed, Coriolis and centrifugal accelerations acting on the balance shafts can be significant resulting in higher shaft deflection and greater lead mismatch. In the present system, a balance shaft mechanism with helical mating gears are considered. Three rotational bodies Crank gear, driving and driven balance shafts are connected through Scissor gear and regular helical gear pairs. Two different analytical procedures to predict the lead mismatch of the mating helical gears (Crank gear and fixed gear of the scissor gear) is investigated. These processes involve creating a quasi-static 3D Abaqus model and a multi-body dynamic 3D AVL Excite model to predict the mismatch across the gear face-width. The contact pattern on the gear face shows good correlation with the experimental observation. As such, analytical procedures have the capability to be utilized for intentional tooth modifications on the helical gear pair to improve the gear tooth surface wear and quieter operation

Notes:

Vendor supplied data

Publisher Number:

2021-01-0673

Access Restriction:

Restricted for use by site license