工程设计学报2019，Vol.26Issue(1)：15-19,28,6.DOI:10.3785/j.issn.1006-754X.2019.01.003
泵用齿轮副困油卸荷的H型侧隙结构研究
Research on H-shaped backlash structure on gear pairs for relief of trapped-oil in pumps
摘要
Abstract
In order to meet different requirements of backlash in gear transmission performance and trapped-oil performance of external gear pumps, an H-shaped backlash structure with large-small-large gap on the non-working surface of driven gear is put forward.Firstly, after analyzing the trapped-oil process of gear pumps, two kinds of area formulas necessary for connection and relief backlash were derived under the connection condition of two different trapped-oil volumes in double teeth meshed range and the relief condition of trapped-oil performance in single tooth meshed range.Secondly, through the derived minimum backlash area, the geometric size of the H-shaped backlash structure was calculated.Finally, a feed-through relief groove with asymmetric micro circular profile was invented for trapped-oil relief in double teeth meshed range.It was showed that whatever the backlash size was, the absolute connection and the absolute trapped-oil relief were not existed, but only the relative connection and relative relief under a certain permission pressure difference.Even if the connection was really satisfied in the backlash connection range, the trapped-oil phenomenon in this range was still not solved, and it must be unloaded by supplemented relief groove.On the premise of keeping transmission performance of gearpairs, the trapped-oil performance of pumps was greatly improved by the H-shaped backlash structure, combined with the circular material removal near the root circle on double gear end faces, larger relief area was built by the feed-through relief groove with double micro circular profiles symmetrical about pitch circle node.It is concluded that the combination of the H-shaped backlash structure and the circular material removal structure and the feed-through relief groove structure can fully meet the requirements of gear transmission performance and trapped-oil performance, and it has the characteristics of simple structure and easy processing.It provides a new relief structure for eliminating the hazards of trapped-oil in external meshing gear pump.关键词
齿轮泵/连通侧隙/卸荷侧隙/H型侧隙/侧隙面积/困油性能/卸荷槽Key words
gear pump/connection backlash/relief backlash/H-shaped backlash/backlash area/trapped-oil performance/relief groove分类
机械制造引用本文复制引用
李玉龙,孙付春..泵用齿轮副困油卸荷的H型侧隙结构研究[J].工程设计学报,2019,26(1):15-19,28,6.基金项目
四川省教育厅自然科学重点资助项目 (16ZA0382) （16ZA0382）
北京卫星制造厂资助项目 (20804) （20804）
