This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Resolution of Engine Oil Mixing with Power Steering Oil in Steering Pump by Behavioral Study
Technical Paper
2015-01-2720
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Steering gear box function is one of the important requirements in heavy vehicles in order to reduce driver fatigue. Improper functioning of steering gear box not only increases the driver fatigue, also concerns the safety of the vehicle. In this present investigation, the engine oil mixing up with steering oil has been identified and steering gear box failure has been observed in the customer vehicle. The root cause of failure has been analyzed. Based on the investigations, in particular design of steering pump has been failed at customer end. The same design of steering pump were segregated and analyzed. Initial pressure mapping study has been conducted. The pressure mapping results revealed that the cavity pressure obstructs the flow of suction pressure. It indicates that obstacle at suction port due to the existence of internal leakage that causes back pressure in the internal cavity of steering pump which sucks engine oil. The primary mode of oil accumulation was because of cavity in the existing design. In addition, single lip seal and unsealed ball bearing was not suitable for particular functional requirement. In order to solve the issue, the cavity was closed by accommodating double lip seal and sealed ball bearing. After the proposed modifications, the pressure mapping study was conducted. The results indicated that the cavity pressure is not obstructing the suction pressure. So effect of cavity pressure was completely eliminated in the proposed design. The design changes have been implemented across all the vehicle models.
Authors
Topic
Citation
Arunachalam, S., Kannan, R., and Sekar, J., "Resolution of Engine Oil Mixing with Power Steering Oil in Steering Pump by Behavioral Study," SAE Technical Paper 2015-01-2720, 2015, https://doi.org/10.4271/2015-01-2720.Also In
References
- Delor , J. and Wong , J. Future Truck Steering Effort Optimization SAE Technical Paper 2007-01-1155 2007 10.4271/2007-01-1155
- Tao , X. Effect of Contamination on Filter Performance SAE Technical Paper 2007-01-4139 2007 10.4271/2007-01-4139
- Stambaugh , R. and Preuss , A. Laboratory Methods for Predicting the Viscosity Loss of Polymer Thickened Hydraulic Fluids SAE Technical Paper 680438 1968 10.4271/680438
- Jones , B. , Johnston , D. , and Longmore , D. Simulation of Suction Flow Ripple in Power Steering Pumps SAE Technical Paper 982023 1998 10.4271/982023
- Adkins , W. Truck Integral Power Steering SAE Technical Paper 700882 1970 10.4271/700882
- Dickinson , A. , Subramoniam , R. , and Stinebring , D. Investigation of Fluid Flow Through a Vane Pump Flow Control Valve SAE Technical Paper 951113 1995 10.4271/951113
- Reimpell , J. , Stoll , H. , and Betzler , J. The Automotive Chassis Second Society of Automotive Engineers, Inc. Butterworth-Heinemann Warrendale 2001 978-0-7506-5054-0
- Hari Srinivas Babu , A. and Janardhanan , D. Design Optimization & Accelerated Testing of Power Steering Pump to Reduce Warranty Costs SAE Technical Paper 2009-01-0557 2009 10.4271/2009-01-0557
- Truck Systems Design Handbook Warrendale Society of Automotive Engineers, Inc. 1992 978-1-56091-285-9
- Symons , J. Engineering Facts About Lip Seals SAE Technical Paper 630486 1963 10.4271/630486
- Carr , J. and Ginn , A. Ethylene/Acrylic Elastomers - New Candidates for Sealing Applications SAE Technical Paper 780403 1978 10.4271/780403
- Horve , L. Evaluating Dust Exclusion for Rotating Shaft Seal Applications SAE Technical Paper 780402 1978 10.4271/780402
- Giles J.G. Steering, suspension and Tyres 1 ILIFFE Books Ltd
- Singh . S. , Jadhav , N. , Nandkeolyar , K. , Pandav , S. et al. Investigation of Frequent Pinion Seal and Hub Seal Leakages on Heavy Commercial Vehicles SAE Technical Paper 2010-01-2015 2010 10.4271/2010-01-2015
- Fenton John Handbook of Vehicle Design Analysis Mechanical Engineering Publications Limited London and Bury St Edmunds, UK 0 85298 963 6
- Kim , D. , Tak , T. , Kuk , M. , Park , J. et al. Evaluation and Experimental Validation of Steering Efforts Considering Tire Static Friction Torque and Suspension and Steering Systems Characteristics SAE Technical Paper 2007-01-3641 2007 10.4271/2007-01-3641