Gear pump
OwnerShigeru Suzuki, Toshiro Fujiiinventors
Life of this patent
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Abstract
A two-stage gear pump has a pump section. The pump section has an internal space that is located adjacent to a driven gear and about a cylindrical surface of the driven shaft. A discharge section of a first gear train is connected to a suction section of a second gear train with a communication passage. The internal space is connected to the communication passage with a pressure introduction passage. The pressure of the communication passage is introduced to the internal space by the pressure introduction passage, so that the pressure atmosphere of the internal space is an intermediate pressure atmosphere of the suction pressure and the discharge pressure of the pump section.
Claims13
A gear pump for sending fluid under pressure, the gear pump comprising a pump section that draws fluid and discharges pressurized fluid, wherein the pump section includes:
- a gear train having a pair of meshed gears, wherein each gear defines a plurality of pump chambers for conveying fluid in the pump section;
- a drive shaft having a cylindrical surface, wherein one of the gears is coupled to the drive shaft such that the gear rotates integrally with the drive shaft;
- and
- a driven shaft having a cylindrical surface, wherein the driven shaft supports the other one of the gears,
- wherein the pump section has an internal space that is located at a position adjacent to at least one of the gears and about the cylindrical surface of at least one of the drive shaft and the driven shaft, and wherein the pressure atmosphere of the internal space is an intermediate pressure atmosphere of the pressure of fluid drawn into the pump section and the pressure of fluid discharged from the pump section.
A gear pump for sending fluid under pressure, the gear pump comprising a pump section that draws fluid and discharges pressurized fluid, wherein the pump section includes:
- a plurality of gear trains that include at least a first gear train and a second gear train, wherein each gear train has a pair of meshed gears, wherein each gear defines a plurality of pump chambers for conveying fluid in the pump section;
- a drive shaft having a cylindrical surface, wherein one of the gears of each gear train is coupled to the drive shaft such that the gear rotates integrally with the drive shaft;
- a driven shaft having a cylindrical surface, wherein the driven shaft supports the other one of the gears of each gear train;
- and
- a fluid conveying passage that includes the pump chambers, wherein the fluid conveying passage includes a communication passage for guiding fluid discharged from the first gear train to the second gear train,
- wherein the pump section discharges fluid drawn into the fluid conveying passage from the fluid conveying passage through the pump chambers, wherein the pump section has an internal space that is located at a position adjacent to at least one of the gears and about the cylindrical surface of at least one of the drive shaft and the driven shaft, and wherein the pump section has a pressure introduction passage that connects the internal space with the communication passage.
Dependencies are inferred from the claim text.