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US 6,280,167 B1Granted
Gear ring pump having a housing wall with a hollow cone recess
AssigneeRobert Bosch GmbH
InventorsArnold Pahl, Rolf Hummel, Gerd Baur
Life of this patent
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AssigneeRobert Bosch GmbH
InventorsArnold Pahl, Rolf Hummel, Gerd Baur
Estimating the term…
A gear pump has a gear wheel with teeth on an outer circumference and a second gear ring with teeth on the inside surface. The gear ring is guided in a circular-cylindrical recess of a housing and together with the gear wheel, each rotates about their own axis which are offset from one another. The gear pump is equipped with an intake opening and a crescent-shaped pressure opening in a first side wall of the housing that defines the recess. A countersunk feature is also provided, embodied as a hollow cone, in a second wall of the housing opposite the pressure opening. The hollow cone, which is in fluid communication with the pressure opening, promotes the buildup of a fluid film between the gear ring and the housing, which improves the wear resistance of the gear pump.
A gear pump (11) including first and second housing parts (19, 20), a gear wheel (14) with teeth on an outside circumference and a gear ring (15) with teeth on an inside surface, the gear ring is guided in a circular-cylindrical recess (18) of a housing part (19) and together with the gear wheel (14) rotates about their own axis (24, 25) which are offset from one another, an intake opening (31) and a crescent-shaped pressure opening (32) in a first side wall (26), defining the recess (18), of the first housing part (19), and a countersunk feature (38), opposite and in fluid communication with the pressure opening (32), in a second wall (28) of the second housing part (20) that defines the recess (18) on another side, and the countersunk feature is embodied as a hollow cone (38).
Dependencies are inferred from the claim text.