Design Engineering and Manufacturing of Technology of Bearings for Heavy-Duty Friction Units

The description of the construction of a self-lubricating sliding bearing of modified wood for heavy-duty friction units and manufacturing technology of it are presented in this article. To determine the coefficient of wood friction on steel, the technique was developed and MI-1M machine friction was modernized. Depending on the load the coefficient of sliding is in the range 0.06–0.11. The designed bearing construction allows one to replace not only sliding bearings, but also the rolling bearings in friction units. The main advantage of such bearing constructions is uniform density over a cross section. This density provides a low coefficient of friction and high wear resistance, as well as the ability to absorb abrasive particles and wear products that provides a long-term zero wear of a rider. To reduce the friction coefficient, the lubricant such as the Biol type is put in the metalized timber in the amount of 7–8% by weight of the wood. To impart the increased rigidity of wood, the hardness and wear resistance nanocrystalline cellulose (NCC) in the amount of 0.5–0.8% by the weight of wood is added into the timber together with the lubricant.