Research on lubrication characteristics of sliding bearings in circular arc gear pumps under variable operating conditionsShuai Wang, Zhenchao Hao, Weifeng Han, Juntao Liu, Geqiang Li, Yunda Liu and Yiwei WuManufacturing Rev., 12 (2025) 11DOI: https://doi.org/10.1051/mfreview/2025007