Influences of Thread Grooves Surface Texturing on Tribological Properties of Cylinder Liner-Piston Ring

Two kinds of thread grooves surface texturing in cylinder liner were designed, machined and tested using the cylinder liner-piston ring friction and wear tester. Compared with the untreated cylinder liner, the cylinder pressure, the contact resistance of the oil film between the cylinder liner and the piston ring, the average friction force of the friction components, the wear losses of piston ring and the worn surface morphologies of the cylinder liner were observed to study the performances of the cylinder liner with thread groove textures. The tested cylinder liner has a surface area ratio S p of 0.076, a thread piece N of 1, a thread pitch S of 40, mm, a groove width w of 3, mm and a groove depth-to-width ratio e of 0.067. The results show that, compared with the untreated cylinder liner, the cylinder liner(single-grooved cylinder liner)has obvious contribution to improve the working performance of the cylinder liner-piston ring, and the sealing performance has improved by 7. 7%,. As the hydrodynamic lubrication is formed in the middle of the piston stroke in the thread groove area, the lubrication performance of oil film increases by 30. 8%,, the anti-friction performance has improved by 7%,, the anti-wear performance of cylinder liner and piston ring has an average reduction of 37.4%, and 49%, respectively. In addition, the cylinder liner(double-grooved cylinder liner)with a S p of 0.040, a N of 2, a S of 176, mm, a w of 3, mm, an e of 0.067, has 2.5%, improvement in anti-friction performance, while the anti-wear performance of cylinder liner and piston ring improves 18.9%, and 32.7%, respectively. © 2018, Editorial Office of the Transaction of CSICE. All right reserved.