Instantaneous air suction of constant pressure variable displacement pump of swing system(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年05期
- Page:
- 118-126
- Research Field:
- 汽车与机械工程
- Publishing date:
Info
- Title:
- Instantaneous air suction of constant pressure variable displacement pump of swing system
- Author(s):
- HU Jun-ke; ZHAO Bin; JIANG Ya-jun; DUAN Xiao-long
- School of Mechanical and Electrical Engineering, Central South University, Changsha 410012, Hunan, China
- Keywords:
- mechanical engineering; constant pressure variable displacement pump; instantaneous air suction; proportional throttle valve; flow change rate; AMESim
- PACS:
- TH137.51
- DOI:
- -
- Abstract:
- To solve the problem of instantaneous air suction of constant pressure variable displacement pump of swing system, the working features of swing system and the principle of air suction were investigated. It was discovered that the major cause for instantaneous air suction is the instantaneous pressure fluctuation of oil in the oil absorption cavity resulted from the rapid change of the output flow during the initial time when the pump changes its displacement. With the establishment of mathematical model and simulation of pump in AMESim, a novel method was proposed to control the flow change rate by setting proportional throttle valve at oil inlet of variable cylinder sensitive cavity. By controlling the throttle opening according to the displacement of variable cylinder, flow and displacement of variable cylinder were adjusted so as to realize the control of flow of the pump. AMESim simulation and experiment research were conducted on the working process of the pump in the state of origin, setting one-way orifice and setting proportional throttle valve. The results show that two methods of setting 1.35 mm one-way orifice and setting proportional throttle valve can both eliminate the phenomenon of air suction basically. The oil pressure in oil absorption cavity of pump stays a little higher than over the air separation pressure in the state of setting proportional throttle valve. In addition, the time of swashplate angle raising is 35 ms. Even though that time is extended by 13% compared with the time (31 ms) in the state of origin, it is greatly less than the time (40 ms) in the state of setting 1.35 mm one-way orifice. Therefore, the method could guarantee the flow efficiency of pump and eliminate the phenomenon of air suction basically, which is of great significance to improve the reliability and efficiency of swing system.
Last Update: 2016-10-06