VANE PUMP DEVICE

• Main Author: TAGA NAOYA
• Format: Patent
• Language: English; Japanese
• Published: 13.02.2020
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS; WEAPONS

To provide a vane pump device which can reduce the pressure of a pump chamber at a start of a suction process.SOLUTION: A vane pump device has a rotor which rotates while supporting ten pieces of vanes so as to be movable to a rotation radial direction, and a cam ring having an internal peripheral face opposing an external peripheral face of the rotor. The vane pump device is transited to a suction process for sucking a working fluid into at least a pump chamber, and to a discharge process for discharging the working fluid from the pump chamber by a change of a volume of the pump chamber caused by a change of a distance from a rotation center of the rotor up to the internal peripheral face of the cam ring according to a rotation angle of the rotor, and after a zone in which distances are the same covers a prescribed rotation angle, when setting an angle for equally dividing a rotation angle at which an end part of a discharge port at a downstream side is formed, and a rotation angle at which an end part of a suction port at an upstream side is formed as a center angle, a start point angle being a rotation angle at which the distance starts to become long is 2.5 degrees or smaller in a rotation angle difference with respect to the center angle.SELECTED DRAWING: Figure 13 【課題】吸入工程開始時におけるポンプ室の圧力を低下させることが可能なベーンポンプ装置を提供する。【解決手段】ベーンポンプ装置は、１０枚のベーンを回転半径方向に移動可能に支持して回転するロータと、ロータの外周面に対向する内周面を有するカムリングと、を有し、ロータの回転中心からカムリングの内周面までの距離がロータの回転角度に応じて変化することで、ポンプ室の容積が回転角度に応じて変化することにより、少なくともポンプ室に作動流体を吸入する吸入工程及びポンプ室から作動流体を吐出する吐出工程に遷移し、距離が同じである区間が所定の回転角度に亘った後に距離が大きくなり始める回転角度である起点角度は、吐出ポートにおける下流側の端部が形成された回転角度と、吸入ポートにおける上流側の端部が形成された回転角度とを等分する角度を中央角度とするとき、中央角度に対して回転角度差２．５度以下である。【選択図】図１３