Gear pump or motor
AssigneeShimadzu Corporation
InventorsKenichi Kanatani, Takahiro Kono
Life of this patent
Estimating the term…
Abstract
A gear pump is capable of maintaining the pump volumetric efficiency for preferably supplying a hydraulic liquid while adequately securing a sealing area, even if a cross sectional area of a flow-in passage is increased. The cross section of a suction passage has a rectangular shape in a side close to a hollow space in a body, and has a circular shape in the outside of the body. The rectangular shape of the suction passage in the hollow space side in the body has a long side extending in a direction along the tooth width of the spur gears, and a short side extending along a direction perpendicular to the tooth width direction. The suction passage has a shape that smoothly connects the rectangular shape in the hollow space side in the body with the circular shape in the outside of the body.
Claims8
A gear pump or a motor comprising:
- a pair of gears housed in a hollow space provided in a body, in a state where each gear of the pair of gears meshes with each other;
- a suction passage for supplying a hydraulic liquid to the hollow space, the suction passage having a first opening in communication with the hollow space and a second opening from which the hydraulic liquid is supplied;
- and
- a discharge passage for discharging the hydraulic liquid from the hollow space, wherein
- a dimension of the first opening in a direction along a tooth width of the gear is larger than a dimension of the first opening in a direction perpendicular to the direction along the tooth width of the gear, and
- a cross sectional area of the suction passage is constant from the second opening to the first opening.
A gear pump or a motor comprising:
- a pair of helical gears housed in a hollow space provided in a body, in a state where the helical gears mesh with each other;
- a suction passage for supplying a hydraulic liquid to the hollow space, the suction passage having a first opening in communication with the hollow space and a second opening from which the hydraulic liquid is supplied;
- and
- a discharge passage for discharging the hydraulic liquid from the hollow space, wherein
- a dimension of the first opening in a direction perpendicular to a direction along a tooth width of the helical gears is larger in a side where the helical gears that are paired and mesh with each other separate earlier and smaller in a side where the paired helical gears meshing with each other separate later, in an area facing the helical gears, and
- a cross sectional area of the suction passage is constant from the second opening to the first opening.
Dependencies are inferred from the claim text.