Effects of Lubricant Properties on Lubricating Performance of Tripod Sliding Universal Joints under Thermal Condition

Abstract

The effects of the lubricant properties on the lubricating performance of the tripod sliding universal joint were studied under thermal condition by numerical method. The obtained results show that increasing lubricant viscosity increases the film thickness whereas increasing viscosity-pressure coefficient or viscosity-temperature coefficient is just the reverse. The pressure hardly depends on the viscosity-pressure coefficient or viscosity-temperature coefficient, and a larger lubricant viscosity induces only a remarkable second pressure peak. Increasing lubricant viscosity or viscosity-pressure coefficient increases the temperature whereas the increasing viscosity-temperature coefficient reduces it.

Effect of different base oils on the friction behaviour of polycrystalline diamond compact

“…As the viscosity value of PAO is higher than that of castor oil and paraffin oil, as shown in Figure 3, Figures 4 and 6, PDC will still wear under PAO lubrication. When the viscosity value is low, the good fluidity of the base oil is conducive to the friction sliding, 33,34 but in the process of friction sliding, it will be subjected to shear stress and more and more heat will be generated with the friction sliding, 35 which will cause the lubrication performance of the base oil to fail. The composition of the different base oils also plays a crucial role in the observed variations in friction and wear properties.…”