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工程设计学报
工程设计学报  2019, Vol. 26 Issue (1): 15-19,28    DOI: 10.3785/j.issn.1006-754X.2019.01.003
创新设计     
泵用齿轮副困油卸荷的H型侧隙结构研究
李玉龙1, 孙付春2
1. 宿迁学院 机电工程学院, 江苏 宿迁 223800;
2. 成都大学 机械工程学院, 四川 成都 610106
Research on H-shaped backlash structure on gear pairs for relief of trapped-oil in pumps
LI Yu-long1, SUN Fu-chun2
1. School of Mechanical and Electrical Engineering, Suqian College, Suqian 223800, China;
2. School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
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摘要：

为满足齿侧间隙在外啮合齿轮泵传动性能和困油性能上的不同需要，提出了一种位于从动齿轮非工作面上的"大-小-大"H型侧隙结构。首先，通过对齿轮泵困油过程的分析，从双齿啮合区内两困油区的连通和单齿啮合区内困油性能的完善两方面出发，建立了连通用和卸荷用侧隙的面积计算公式；然后，根据所确定的最小侧隙面积，计算出H型侧隙结构的几何尺寸；最后，提出一种双微圆贯通型卸荷槽，实现双齿啮合区的困油卸荷。实例分析结果表明：无论侧隙大小如何变化，都不存在绝对连通和绝对卸荷，只有在一定许可压差下的相对连通和相对卸荷；即使侧隙连通区实现了真正的连通，该区内的困油问题仍没有得到解决，需辅以额外的卸荷槽加以卸荷；"大-小-大"H型侧隙结构，既满足了齿轮传动的性能要求，也极大地提高了泵的困油性能；齿轮齿槽根部的两端面圆形除料和双微圆对称贯通型卸荷槽能提供足够的卸荷面积。研究结果表明H型侧隙结构、齿槽根部的两端面圆形除料和双微圆对称贯通型卸荷槽的组合充分满足了齿轮传动性能和困油性能的要求，且具有结构简单、易加工等特点，为消除外啮合齿轮泵困油的危害提供了一种新的卸荷结构。
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    
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 gear pairs, 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.
Key words: gear pump    connection backlash    relief backlash    H-shaped backlash    backlash area    trapped-oil performance    relief groove
收稿日期: 2018-04-02 出版日期: 2019-02-28
CLC:  TH325  
基金资助:

四川省教育厅自然科学重点资助项目（16ZA0382）；北京卫星制造厂资助项目（20804）
通讯作者: 孙付春(1981-),男,江苏东台人,副教授,博士,从事农业机械设计与应用研究,E-mail:fch.sun@163.com,https://orcid.org/0000-0001-6787-6988     E-mail: fch.sun@163.com
作者简介: 李玉龙(1968-),男,江苏泰兴人,教授,博士,从事泵理论及现代设计方法研究,E-mail:leo-world@163.com,https://orcid.org/0000-0002-5609-6836
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引用本文:

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.

LI Yu-long, SUN Fu-chun. Research on H-shaped backlash structure on gear pairs for relief of trapped-oil in pumps. Chinese Journal of Engineering Design, 2019, 26(1): 15-19,28.

链接本文:

https://www.zjujournals.com/gcsjxb/CN/10.3785/j.issn.1006-754X.2019.01.003    或    https://www.zjujournals.com/gcsjxb/CN/Y2019/V26/I1/15

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