Title:
GEAR PUMP AND METHOD FOR OPERATING A GEAR PUMP
Document Type and Number:
WIPO Patent Application WO/2013/013879
Kind Code:
A3
Abstract:
A gear pump for delivering a fluid, which gear pump has a rotatably mounted toothed wheel with external toothing and has a toothed ring with internal toothing, wherein a multiplicity of delivery chambers are formed by the meshing of teeth, and having a suction-side inflow duct and a pressure-side outflow duct, wherein between the inflow duct and the outflow duct there is formed a sealing region, wherein an orifice is formed in the sealing region on the side on which the delivery chambers decrease in size during the rotation of the toothed wheel and of the toothed ring. A method for delivering a fluid in a high-pressure injection system, wherein a first hydraulic path is provided which leads from a pressure-side outflow duct of the gear pump via a high-pressure pump to a high-pressure accumulator, and a second hydraulic path is provided which leads from a pressure-side opening of the gear pump via a suction valve and a pump cylinder of the high-pressure pump to the high-pressure accumulator, wherein, in a standard operating mode in which the gear pump performs the function of predelivery of the fluid to the high-pressure pump, the fluid is supplied to the high-pressure accumulator via the first hydraulic path and the second hydraulic path, and wherein, in a starting mode for the rapid build-up of a high pressure in the high-pressure accumulator, the fluid is supplied to the high-pressure accumulator only via the second hydraulic path, wherein at the same time the fluid quantity emerging from the gear pump via the first hydraulic path is supplied back to the inflow duct of the gear pump via a bypass path.
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| JPS59128987 | GEAR PUMP |
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Inventors:
FUCHS ALEXANDER (AT)
Application Number:
PCT/EP2012/061126
Publication Date:
August 22, 2013
Filing Date:
June 12, 2012
Export Citation:
Assignee:
BOSCH GMBH ROBERT (DE)
FUCHS ALEXANDER (AT)
FUCHS ALEXANDER (AT)
International Classes:
F04C2/08; F02D41/38; F04C2/10; F04C15/06
Foreign References:
| DE2720406A1 | 1978-11-09 | |||
| DE4303328A1 | 1994-08-11 | |||
| DE19626153A1 | 1997-01-09 | |||
| DE19942955A1 | 2000-03-16 |
Attorney, Agent or Firm:
ROBERT BOSCH GMBH (Stuttgart, DE)
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