A gear pump is a type of pump that displaces a volume of fluid by physical or mechanical action, or positive displacement pump. Power is applied to one of the gears and transmitted to a second driven gear via meshing teeth. This paper describes the hydraulic gear pump for an elevator. In gear pump, since geometrically special forms of gear tooth, ‘ulsations’is always caused in the delivery pressure and quantity. In other words, it is found that the number of delivery pressure pulsation per each revolution is always equal to that of the gear-teeth of the gear, which is coincident with the pulsation of the ideal delivery quantity. Some experimental results are given to verify the effectiveness of the developed pump.

Abstract
 1. 서론
 2. 이론적 고찰
  2.1 기어 펌프의 구조
  2.2 기어펌프의 토출용적
 3. 결과 및 고찰
  3.1 펌프 제작 결과
  3.2 펌프 성능 시험
 4. 결론
 참고문헌

• 정석훈(전주비전대학 자동차과) | Seok-Hoon. Jeong