Analysis Of Characteristics Of Double Curve-face Gear Piston Pump Composite Transmission

Double curve-face gear plunger pump is a new type axial piston pump. It was based on the research of swash plate type piston pump and curve-face gear pair. It used double curve-face gear instead of swash plate. Its friction pair was insteaded by gear pair. It combined with the characteristics of roller gear cam and gear pair. It had some advantages including smaller cycle, higher frequency, wear resistance, lower speed requirement, uninterrupted row oil and so on.This topic originates from the National Natural Science Foundation of Chinasubsidization project, which named "variable transmission ratio of face gear design theory and manufacturing technology research". The transmission characteristics of double curve-face gear piston for plunger pump was discussed. A theoretical foundation and experimental basis was formed. In this paper, the characteristics of this new type of piston pump were studied.According to the principle of gear meshing and basic theory of conjugate surfaces, a double curve-face gear transmission mechanism was proposed. The double curve-face gear transmission principle was discussed. The parameter equations of the end surface of gear pitch surface was calculated. This paper expounded the working principle of the oblique disc type plunger pump and the double end curved surface gear piston pump, and compares the differences between the two kinds of working principle.According to the theory of structure design and kinematics calculation of the oblique disc type plunger pump. The layout form of double curve-face gear piston mechanism and the transmission law of plunger mechanism were discussed. The kinematic characteristic equations of displacement, velocity and acceleration of pistons were derived. The influences of structural parameters on the kinematic characteristics were analyzed. The structural parameters including plunger quantity, eccentricity ratio and double curve-face gear orders. The effects of different input rotational speed on the kinematic characteristics were discussed. The differences between the kinematic characteristics of the helical piston pump and double curve-face gear piston pump were compared and analyzed.According to the theory of flow calculation of open piston pump. The calculation formula of the average flow, instantaneous flow and flow pulsation of double curve-face gear piston pump were derived. The influences of the geometric parameters on the instantaneous flow characteristics and flow pulsation characteristics were discussed. The geometric parameters including the quantity of pistons, the eccentricity and the order of double curve-face gear. A parameter optimization design method to improve the performance of flow pulsation was proposed.Using the virtual prototype technology, the six plunger type simulation model of the new pump was established. The ADAMS general simulation constraint method was put forward. The kinematics simulation of the simplified model of the piston pump was completed. A design scheme of integral structure of double curve-face gear piston pump was presented. Using the processing method of increasing material manufacturing, the key parts of the double curve-face gear piston pump were processed. The feasibility experiment platform of the plunger pump was set up. The feasibility experiment verification was completed. A single plunger mechanism bench test platform was built. The unloading and loading conditions of piston experimental work were completed. The effect of load changes on the kinetic characteristic of piston pump was obtained. The effect of different input speed on the piston motion was discussed. It was proved that the plunger mechanism has a certain bearing capacity, and the analysis method was correct.