DOUBLE PUMP STRUCTURE

PROBLEM TO BE SOLVED: To simplify a suction structure by making first and second pumps suck oil from a single oil source, and meanwhile, to effectively prevent or reduce insufficient suction of the oil in both of the first and second pumps when a drive source is shifted from a stop state to a drive state.SOLUTION: A double pump structure according to the present invention includes: first and second pumps which are rotary driven operatively by drive force from a drive source; a single oil source; a first suction line which makes fluid connection between an oil take-out port of the oil source and a suction port of the first pump; and a second suction line whose upstream side end part is fluid-connected to the first suction line and also whose downstream side end part is fluid-connected to a suction port of the second pump. The suction port of the second pump is positioned lower than the upstream side end part of the second suction line, and the entire region of the second suction line is vertically aligned with or positioned below the upstream side end part. 【課題】第１及び第２ポンプが単一の油源から油を吸引することで吸引構造の簡略化を図りつつ、駆動源が停止状態から駆動状態へ移行された際に第１及び第２ポンプの双方において油の吸引不足が生じることを有効に防止乃至は低減する。【解決手段】本発明に係る二連ポンプ構造は、駆動源からの動力によって作動的に回転駆動される第１及び第２ポンプと、単一の油源と、前記油源の油取出口及び前記第１ポンプの吸引口を流体接続する第１吸引ラインと、上流側端部が前記第１吸引ラインに流体接続され且つ下流側端部が前記第２ポンプの吸引口に流体接続された第２吸引ラインとを備える。前記第２ポンプの吸引口が前記第２吸引ラインの上流側端部より下方に位置し、且つ、前記第２吸引ラインの全域が前記上流側端部と上下方向同一位置又は下方に位置している。【選択図】図３