齿轮联轴器的润滑一般都采用润滑脂,因润滑脂比稀油润滑更能克服联轴器运转时的离心力。但润滑脂中比重较大的增稠剂经一定时间使用后,就会发生与基础油分离的不良现象。这样就会使润滑脂失去润滑作用,以致使齿轮联轴器的磨损加剧。近年来研制成两种齿轮联轴器用的特种润滑脂,它是以高粘度的精制矿物油为基础油,用聚乙烯作为增稠剂,其物理性能见下表。这种润滑脂的独特优点是:一旦受到剪切即会迅速软化,其针入度会随着剪切次数的增加而增加达200％,而一般润滑脂剪切前后的针入度变化仅在10％以下。这种润滑脂在日本和美 Lubrication of gear couplings are generally used grease, because grease lubrication than thin oil to overcome the centrifugal force when the coupling operation. However, a larger proportion of grease thickener after a period of time use, there will be the separation of the base oil and the adverse phenomena. This will make the grease lose lubrication, so that the gear coupling wear increased. In recent years developed into two gear coupling special grease, it is based on high viscosity refined mineral oil as a base, with polyethylene as a thickener, the physical properties of the table below. The unique advantages of this grease are that it softens quickly once it is sheared and its penetration increases up to 200% with increasing number of cuts, whereas the change in penetration before and after the normal grease shear is only at Below 10%. This grease in Japan and the United States