Development of high damping powertrain mount using thixotropic fluid
2022-01-0734
03/29/2022
- Event
- Content
- Vibration isolation performance and damping performance of powertrain mount are important for improving NV and ride comfort performances of the vehicle, respectively. In this research, based on the principle of liquid sealed mounts, we focused on the fact that the ideal fluid viscosity differs depending on the input frequency. By combining the liquid resonance phenomenon and thixotropic fluid, we developed a technology that balances a high level between low dynamic spring rate and high damping, which are trade-off items for liquid sealed mounts. The thixotropic fluid was blended with ethylene glycol aqueous solution as a base solution and smectite nano-cray as a thixotropic agent. From the view point of the viscosity corresponding to the shear rate and the viscosity at the high shear point, the optimum concentration of smectite was shown to be 1.5 wt%. As a result of measuring the dynamic characteristics of the mount unit using this thixotropic fluid, the damping coefficient increased by 15 % while maintaining the dynamic spring rate. Furthermore, the results of a bench test in which this mount unit was attached to an actual vehicle showed that the vibration transmission characteristics at powertrain resonance point were improved by 1.3 dB due to the high damping performance of the unit. Using this technology, it was possible to achieve both low dynamic spring rate and high damping, which are the trade-off items of liquid sealed mounts, by simply changing the liquid inside. The effect was confirmed even in a bench test of an actual vehicle.
- Citation
- Takaesu, K., Sogawa, N., Kuwahara, H., and HAYAKAWA, S., "Development of high damping powertrain mount using thixotropic fluid," SAE Technical Paper 2022-01-0734, 2022, .