This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Influence of Gear Web and Macro Geometry on Mesh Misalignment
Technical Paper
2016-28-0082
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In an automotive transmission system, gear mesh misalignment implies the shift in the position of the meshing surfaces. Misalignment at the mesh results in non-uniform load distribution leading to gear failure, increased noise and thus affects the transmission performance. In general, misalignment along the line of action (MLOA) of 0-5 mrad is common in the gear meshes of automotive transmissions. Major factors contributing to mesh misalignment are deflections of various elastic components in the transmission like shaft, gear web, bearing, housing etc. Contribution from other factors include clearance between the components, temperature gradient and manufacturing process limitations. Different approaches for compensating gear mesh misalignment involves control over the above factors at design and manufacturing stages.
This paper focuses on three different approaches for compensating MLOA in the design stage. As today’s transmission should be lighter to have more power to weight ratio, gear web design plays a significant role in controlling deflection at the gear mesh. Various web designs are analyzed using 3D FEA tool (GSAM) which depicts the influence of different web shapes on MLOA. Influence of helix angle and pressure angle on MLOA is studied using design of experiments (DoE) approach. As the MLOA cannot be eliminated completely by design of web and macro geometry, approach of micro geometry to compensate for the remained MLOA is described.
This study provides an understanding on importance of gear web designs, gear macro geometry parameters and gear micro geometry technique to compensate for mesh misalignment in geared system.
Recommended Content
Technical Paper | Current Design Trends of Sleeve Bearings and Thrust Washers in Passenger Car Automatic Transmissions |
Technical Paper | Planetary Carrier Staking Groove Optimization |
Technical Paper | Optimizing Transmission Bearing Selection and Assembly |
Authors
Citation
Ganti, V., Dewangan, Y., and Subramanian, G., "Influence of Gear Web and Macro Geometry on Mesh Misalignment," SAE Technical Paper 2016-28-0082, 2016, https://doi.org/10.4271/2016-28-0082.Also In
References
- Houser , D. and Harianto , J. The Effect of Micro-Geometry and Load on Helical Gear Noise Excitations SAE Technical Paper 2005-01-2295 2005 10.4271/2005-01-2295
- Predicting the Effects of Transmission Housing Flexibility and Bearing Stiffness on Gear Mesh Misalignment and Transmission Error Harris1 O.J. , Douglas M. , James B.M. , Woolley A.M. , Lack L.W.
- Singh , A. Application of a system level model to study the planet load sharing behavior J.Mech. Des. 127 469 476 2005
- Singh , A. Understanding the Influence of System Level Variables on Transmission Gear Performance Proc.2002 Global Powertrain Congress Ann Arbor, MI 21 40 54 2002
- Vijayakar , S. A combined surface integral and finite element solution for a three-dimensional contact problem Int. J. Numer. Methods Eng. 31 525 545 1991
- Gear mesh misalignment Gear solutions magazine
- ANSI/AGMA 6011- I03
- Ganti , V. , Dewangan , Y. , Arvariya , S. , and Madhavan , S. Influence of Micro-Geometry on Gear Scuffing SAE Technical Paper 2015-26-0187 2015 10.4271/2015-26-0187