GEAR PUMP OR MOTOR
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United States of America Patent
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Jul 5, 2022
Grant Date -
Jul 28, 2022
app pub date -
Jan 28, 2021
filing date -
Jan 28, 2021
priority date (Note) -
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status (Latency Note)
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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.
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