Double Circular Arc Gear Pump Design

Gear pump as an energy conversion device plays an indispensable role in the field of modern industry. Although the traditional involute gear pump has simple structure, small size, light weight, easy fabrication, low cost, reliable work, self-priming capability is strong, is not sensitive to oil pollution, convenient maintenance, but its pulsation is larger, the noise is bigger, the shortcomings of low working pressure in the modern industrial application is increasingly prominent.This article USES the "double circular arc cosine transition curve" as a new tooth form to carry on the design of the gear pump, when the tooth meshing tooth profile for a continuous contact. Compared to the tooth profile and involute gear pump tooth shape, tooth surface meshing process without relative sliding, smooth operation, the tooth surface abrasion, won’t produce trapped oil phenomenon, can eliminate the flow pulsation, and compared with the size of the involute gear pump with large flow. So compared with the involute gear pump, double circular arc gear pump with low noise, high pressure, long service life, high efficiency, etc.This article from the elimination of trapped oil, the gear pump flow pulsation aspects, combined with the finite element software, the design of the double circular arc gear pump. Paper’s main work is as follows:1) According to the characteristics of the double circular arc tooth profile, the meshing principle from the basic principle of double circular arc gear rack tooth profile of the calculated formula of gear tooth face, combined with the rated pressure and flow rate of the gear pump is required to design the basic parameter of the tooth profile.2) Calculation and analysis of double circular arc gear pump flow, in order to eliminate the flow pulsation for the purpose of design of gear teeth, modulus, pressure Angle, tooth width, contact ratio, helix Angle. According to the above steps draw parameters set gear three-dimensional entity model, stress analysis was carried out on the gear, gear material selected, calculate the diameter of axle and using sliding bearing and the verification and design the main, the size of the driven gear shaft.3) Leakage of gear pump is analyzed at the same time, to reduce the energy loss is more reasonable for the purpose of the gear side clearance and radial clearance, design and calculation of floating lateral plate so as to control end clearance also balance the axial force of the gear pump, to control the radial clearance.4) Stress calculation and the design of the gear according to the above parameters on the stress calculation theory of gear meshing, and through the finite element analysis software for analysis and verification of the stress of meshing gears. The finite element analysis was carried out on the gear shaft and checking. According to the design pressure of gear pump gear pump shell to verify analysis.5) Other parts of the gear pump selection and calculation of assembly out of the 3 d model of gear pump, draw 2 d drawings, processing out of the double circular arc gear, and design a test plan.