Analysis Of Tooth Profile Of Straight Conjugate Internal Gear Pump

Gear pump is a hydraulic components commonly used in the hydraulic transmission system. Because of internal gear pump has the advantages of compact structure, small flow pulsation, low noise, small size, light weight, easy to get the high pressure, convenient production and maintenance, internal meshing gear rotate in the same direction, relative sliding velocity, long service life, so the pressure pulse generated vibration and noise are relatively small. In recent years, in the mechanical engineering, mechanical and electronic engineering industry has been rapid development.Straight conjugate internal gear pump is the pump body is a kind of economical and practical, has many advantages. The volumetric efficiency of internal gear pump with high speed and high. Because of many advantages of internal gear pump, which makes it in the aerospace industry, ship industry, machinery processing industry, vehicle loading and transportation industry, agriculture and other aspects of a wide range of applications.In this thesis, the straight conjugate internal gear pump as the research object, the meshing principle, flow pulsation, trapped oil phenomenon, the working noise issues such as the theoretical analysis and research. These theoretical analysis and research to improve the efficiency of straight conjugate internal gear pump, noise reduction effect and significance of very practical. Analysis of this paper mainly from the following aspects:On the significance of the research, the straight conjugate internal gear pump status and development trend of understanding. Know the academic environment and development direction.The working principle of straight conjugate internal gear pump, gear pump tooth profile equation is derived and the meshing line equation. Grasp the characteristics of the conjugate tooth profile, because the tooth shape of gear pump determines the performance of gear pump, a practical research on promoting low noise pump body significance.Calculation formula of flow pulsation, the theory capacity derived straight conjugate internal gear pump in mathematics."The theoretical formula swept area method" is the straight conjugate internal gear pump’s flow, and analyzes its influence on the efficiency, noise, design parameters and other factors. Flow uniformity is an important characteristic of the pump, if the flow pulsation of the pump, not only makes the stability but of uniformity hydraulic system variation, but also causes the pressure fluctuation, and makes the system vibration, and had a great noise.Expounds the causes of noise of gear pump gear of straight conjugate internal gear transmission, and found in the actual production of impact factor of noise; found the phenomenon of trapped oil is the major influencing factors, and put forward the corresponding measures and solutions to noise reduction. Finally, it puts forward three measures of reducing vibration and noise. These measures are feasible degree is high, can be transformed into enterprise production design technical solutions.Study of straight conjugate internal gear pump the above-mentioned parameters in each chapter, after summarizes the factors that influence the parameters of gear pump, in order to reduce the noise, the effective measures to improve the straight conjugate internal gear pump efficiency.