With the rapid development of national economy, the application of hydraulic transmission is more and more widely, and has become an important symbol to measure the level of industrialization of a country or department. Gear oil pump has been widely used because of its simple structure, small volume, light weight, convenient operation and maintenance, and has strong self-priming ability, insensitive to oil pollution and other characteristics. The main disadvantages of gear oil pump are radial fluid pressure imbalance, large flow pulsation and high noise. In addition, its displacement can not be adjusted, and the range of use is limited.
The author comprehensively analyzes the research status and practice of oil pump. Based on the combination of planetary transmission theory and gear oil pump working principle, the structure principle of balanced compound gear oil pump (hereinafter referred to as compound gear oil pump) is put forward. Theoretical analysis and experimental study show that the pump has a series of advantages, such as radial fluid pressure balance, large flow, good flow uniformity, variable and so on. It can replace the common gear oil pump and widely used in hydraulic system. Due to the balance of radial hydraulic pressure on the main components of the pump, the clearance between the gear tip circle and the pump body can be controlled very small, which creates conditions for the high pressure of the pump.
The basic theory of Compound Gear Oil Pump is compiled by the author according to his teaching and scientific research practice for many years. The main content is the author's doctoral degree in China University of Mining and Technology (Beijing campus), under the guidance of the doctoral supervisor Professor An Liqian and Professor Wang Zhengliang, but also some of the author's papers published in various academic journals. The research in this book was supported by the National Natural Science Foundation of China (No. 59575010). Thanks are hereby given.
"Compound gear oil pump basic theory" in the preparation process has read many researchers prepared a variety of information, literature and books: in the compound gear oil pump model production and test process, has been hefei hydraulic parts factory, Jining hydraulic parts factory and Huainan Institute of Technology strongly support; Professor Xu Xianliang, Hou Bo, Zhang Anning, Associate Professor Zhang Jun and two senior engineers Jia Beihua and Zhang Li gave great help to the research team. Graduate students Yu Hong and Ruan Xueyun assisted in part of the work; Associate Professor Jiang Wei, Dr. Liu Zhiguo and Dr. Zhao Guopu have given the author a lot of help, and they would like to express their heartfelt thanks! Due to the author's limited level, the book inevitably has shortcomings and mistakes, welcome readers' criticism and correction.
