Minimizing of Automotive Transmission Rattle Noise by Means of Gear Oils by Axel Baumann

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Minimizing of Automotive Transmission Rattle Noise by Means of Gear Oils

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Contents of Minimizing of Automotive Transmission Rattle Noise

  • Introduction
  • Issue
  • Task and Objective of the Work
  • Structure of the Work
  • State of the Art in Research and Technology
  • Market and Development Situation of Vehicle
  • Transmissions
  • Torsional Vibration Behavior of Internal Combustion
  • Engines
  • Requirements and Structure of Vehicle Transmissions in Spur Gear Design
  • Work on Rattling Noise Behavior of Vehicle Transmissions
  • Measures to Minimize Rattle Noise from Vehicle
  • Transmissions
  • Transmission Power Loss
  • Gear Rattling Noises from Vehicle Transmissions
  • Gear Rattling
  • Synchronizer Ring Rattling
  • Rattle Noise Analysis of Vehicle Transmissions
  • Test Bench Setup and Test Execution
  • Acoustic Properties of the Soundproof Cabin
  • Lubricants as Design Elements
  • Tasks and Requirement Profile of a Gear Lubricant
  • Chemical Composition of Gear Oils
  • Mineral Oil Based Base Oils
  • Polyether Oils
  • Synthetic Hydrocarbons
  • Carboxylic Acid Esters
  • Additives
  • Mechanical Properties of Gear Oils
  • Viscosity
  • Density
  • Selected Test Procedures for Testing Gear Oils
  • Contact Angle Measurement
  • Mini Traction Machine for Measuring the Coefficient of Friction
  • Flow Behavior under Shear Stress
  • Parameter Variation of Base Oils and Additives
  • Structure of the Manual Transmission for Front-Transverse Drive
  • Test Procedure
  • Rattle Noise Investigations
  • Standard Gear Oils, Adhesion Additive and Wetting Agent
  • Gear Oils Based on Polyalkylene Glycols
  • Base Oil Type Variation
  • Variation of VI Improvers
  • Different Concentrations of Dispersant PAMA
  • Various VI Improvers in High Concentration
  • Formulations with Ester Oils
  • Effect of Friction Modifier and Antifoam Agent
  • Measurement of the Drive-Side Torque Loss
  • Notes on formulating an optimized gear oil
  • Correlation between Oil and Geometric Parameters
  • Structure of the Single-Stage Test Gearbox
  • Test Procedure
  • Gear Rattle Experiments
  • Oil Level Variation
  • Variation of the Oil Sump Temperature
  • Contribution of Synchronizers
  • Influence of a Relative Speed Between Gear Shaft and Idler Gear
  • Influence of the Oil Type with Different Torsional Backlashes
  • Dependence between Axial and Torsional Backlash
  • Synchronizer Ring Rattling Experiments
  • Variation of Oil Sump Temperature
  • Influence of a Relative Speed between the Synchronizer Hub and Synchronizer Ring
  • Variation of the Clearance between Synchronizer
  • Hub and Synchro-Ring
  • Mechanism of Gear Rattling Noise Generation
  • Rotational Path Deviation Without Torsional Vibration
  • Excitation
  • Comparison of Straight and Helical Gears
  • Influence of Torsional Backlash with Helical Idler Gear in the Non-Shifted State
  • Variation of the Oil Type with Helical Gearing
  • Summary of the Mechanism of Rattling Noise Generation

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