Large Modulus Method to Effectively Relieve Trapped-oil Phenomenon for Gear-pump and Gear-motor with Equal Displacement

Liu Ping; Li Yulong; Song Anran

doi:10.16578/j.issn.1004.2539.2024.06.013

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Large Modulus Method to Effectively Relieve Trapped-oil Phenomenon for Gear-pump and Gear-motor with Equal Displacement

Design· Calculation | 更新时间：2024-06-19

- Large Modulus Method to Effectively Relieve Trapped-oil Phenomenon for Gear-pump and Gear-motor with Equal Displacement
- Journal of Mechanical Transmission Vol. 48, Issue 6, Pages: 83-88(2024)
- 作者机构：
  
  宿迁学院机电工程学院，江苏宿迁 223800
- 作者简介：
- 基金信息：
- DOI：10.16578/j.issn.1004.2539.2024.06.013
  CLC：
- Published：15 June 2024，
  
  Received：04 March 2023，
  
  Revised：05 April 2023，
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刘萍,李玉龙,宋安然.泵/马达困油现象充分缓解的等排量大模数方法[J].机械传动,2024,48(06):83-88.

Liu Ping,Li Yulong,Song Anran.Large Modulus Method to Effectively Relieve Trapped-oil Phenomenon for Gear-pump and Gear-motor with Equal Displacement[J].Journal of Mechanical Transmission,2024,48(06):83-88.
刘萍,李玉龙,宋安然.泵/马达困油现象充分缓解的等排量大模数方法[J].机械传动,2024,48(06):83-88. DOI： 10.16578/j.issn.1004.2539.2024.06.013.

Liu Ping,Li Yulong,Song Anran.Large Modulus Method to Effectively Relieve Trapped-oil Phenomenon for Gear-pump and Gear-motor with Equal Displacement[J].Journal of Mechanical Transmission,2024,48(06):83-88. DOI： 10.16578/j.issn.1004.2539.2024.06.013.

摘要

为了充分缓解外啮合齿轮泵/马达困油现象，在确保产品输出能力不变的等排量前提下，分析模数对困油腔内的负荷流量、泄漏流量和卸荷流量的影响，提出了一种等排量大模数的设计方法，并基于这3种流量的瞬时平衡和同齿形参数、不同模数下卸荷面积的演绎计算，计算出困油压力并由此判断出困油现象的缓解程度。结果表明，对于给定的齿轮副和工况条件，等排量下的齿宽系数反比例于模数的3次方，模数越大，困油现象越趋于缓解，且径向力越小，但齿宽系数越小；同齿形参数、不同模数下的卸荷面积等于模数的平方乘基准模数为1下的卸荷面积，从而为同齿形参数、不同模数下的卸荷面积计算，提供了极大方便；卸荷槽外通的进出口压力互为颠倒，导致泵较马达的困油现象更严重，但等排量小模数马达同样也会出现较为严重的困油现象。得出了选择最大化/较大的模数应为泵/马达的设计准则的重要结论。

Abstract

In order to effectively relieve the trapped-oil phenomenon of external gear-pumps and gear-motors

based on its constant output capacity

by analyzing the influence of large modulus under equal displacement on the load flow

leakage flow and unloading flow in trapped-oil chamber

a design method of large modulus with equal displacement is proposed. Based on the instantaneous balance of these three flows

and the deductive calculation of the unloading area under different modules with the same tooth profile parameters

the trapped-oil pressure is calculated and the relief degree of the trapped-oil phenomenon is judged. The results show that the tooth width coefficient under equal displacement is inversely proportional to the third power of the modulus for a given gear-pairs and working conditions

the larger the modulus is

the more the trapped-oil phenomenon tends to be relieved

and the smaller the radial force is

the smaller the tooth width coefficient will be. The unloading area under different modules and the same tooth shape parameter is equal to the module square multiplied by the unloading area under the reference module of 1

which provides great convenience for calculating the unloading area under different modules with the same tooth profile parameters.The inlet and outlet pressures outside the unloading groove are reversed

leading to a more serious trapped-oil phenomenon in the gear-pump than in the gear-motor

but the small modulus motor also shows more serious trapped-oil phenomenon. It is concluded that the maximized or larger modules is included in the gear-pump and gear-motor design criteria.

关键词

齿轮泵/马达困油现象缓解等排量大模数齿宽系数困油压力

Keywords

Gear-pump and gear-motorRelief of trapped-oil phenomenonLarge modulus with equal displacementTooth width coefficientTrapped-oil pressure

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