기어 펌프의 이중 원호 헬리컬 치형 설계 및 시뮬레이션에 관한 연구

Abstract

In this study, double circular arc helical gear profile design for hydraulic external gear pump was conducted. Gear tip and root are made of circular arc. Furthermore, involute curve was used as a transition curve to connect gear tooth tip arc and root arc. Gear profile was designed to minimize the discontinuous shape of the gear by modifying the geometric shape of the tooth shape. Pressure angle and lead length are selected in order to meet target specification of gear pump. The designed double circular arc helical gear pump was simulated using AMESim, a general-purpose hydraulic analysis program, to perform a design review such as a designed gear tooth profile. Also gear case and leakage within pump are realized by using AMESim. Inlet·outlet port of gear case were calculated with segment length that is based on case’s structural features. Leakage flow-rate was also calculated in the same manner. Through the simulation model, the flow and pressure characteristics of the double circular arc helical gear pump were analyzed. In addition, comparing double circular arc helical gear pump’s dynamic characteristics to spur gear pump’s one was conducted. To compare the characteristic, spur gear pump user defined simulation model was also made by AMESim program. High volumetric efficiency and low flow and pressure ripple of double circular arc helical gear pumps were proved with compared results.