多圆柱齿轮液压马达的性能

针对普通单对圆柱齿轮液压马达单位体积排量小、排量脉动率大、低速稳定性差的缺点,对多圆柱齿轮液压马达的性能指标进行理论研究与探讨.通过分析多圆柱齿轮液压马达的工作原理与结构特点,得到多圆柱齿轮液压马达的构成形式,推导该类型液压马达的排量、单位体积排量及排量脉动率等主要性能指标的计算公式.分析各齿轮齿数的选取对多圆柱齿轮液压马达排量、排量脉动率的影响,得出提高多圆柱齿轮液压马达单位体积排量及降低多圆柱齿轮液压马达排量脉动率的各齿轮齿数的选取方法,并给出在保证多圆柱齿轮液压马达密封可靠性前提下中心齿轮齿数应满足的条件.通过设计计算实例,比较在相同排量及相同齿轮宽度条件下,多圆柱齿轮液压马达与普通单对圆柱齿轮液压马达的具体性能指标,验证了多圆柱齿轮液压马达具有单位体积排量大、脉动率小等优点.

PERFORMANCE OF HYDRAULIC MOTOR WITH MULTI-EXTERNAL MESH SPUR GEARS

Due to the shortcomings of small unit volume displacement, large displacement pulse ratio and poor low-speed stability characteristics for the hydraulic motor with an external mesh spur gear, theoretical studies on performance indexes of hydraulic motor with multi-external mesh spur gears are proposed. On the basis of analysis of the structure and working principle for hydraulic motor with multi-external mesh spur gears, the hydraulic motor's constitution is presented, and formulae are deduced for calculating its primary performance indexes such as displacement, unit volume displacement, displacement pulse ratio, etc. The influence of the gears' tooth number on displacement and displacement pulse ratio is analyzed and the selected method of tooth number on the gears mesh is discussed. This method improves unit volume displacement of hydraulic motor with multi-external mesh spur gears and reduces its displacement pulse ratio. And the necessary conditions that tooth number of the center gear should guarantee the reliability of sealing capability are presented. Under the conditions of same displacement and width of gears, the design instance is included to compare specific performance indexes between hydraulic motor with an external mesh spur gear and hydraulic motor with multi- external mesh spur gears. It is verified that the hydraulic motor with multi-external mesh spur gears has the advantages of smaller displacement pulse ratio, larger unit volume displacement, and so on.