EP0427973A1 - Pompe à engrenages - Google Patents

Pompe à engrenages Download PDF

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Publication number
EP0427973A1
EP0427973A1 EP19900119951 EP90119951A EP0427973A1 EP 0427973 A1 EP0427973 A1 EP 0427973A1 EP 19900119951 EP19900119951 EP 19900119951 EP 90119951 A EP90119951 A EP 90119951A EP 0427973 A1 EP0427973 A1 EP 0427973A1
Authority
EP
European Patent Office
Prior art keywords
pressure
sealing plate
gear pump
pump
pressure medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19900119951
Other languages
German (de)
English (en)
Inventor
Hayno Dipl.-Ing. Rustige
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0427973A1 publication Critical patent/EP0427973A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0096—Heating; Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0023—Axial sealings for working fluid
    • F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps

Definitions

  • the invention relates to a gear pump according to the preamble of the main claim.
  • a gear pump it happens that the pressure medium flowing when the sealing plate is lifted from the high-pressure to the low-pressure side is heated to such an extent by the friction between the gears and the sealing plate that the gear pump is destroyed in a short time for the purpose of regulating the flow rate (regulating state of the gear pump) can.
  • the gear pump according to the invention with the characterizing features of the main claim has the advantage that, during the so-called curtailment of the gear pump, part of the pressure fluid that is discharged flows through the bearings to the container and another part flows along the sealing plate to the suction point.
  • the first part is large enough so that enough cool pressure medium can be returned to the system from the container. In this way, overheating of the gear pump can be avoided with certainty.
  • FIG. 1 shows in Figure 1 a longitudinal section through a gear pump, in Figure 2 a section along II according to Figure 1, in Figure 3 a plan view in the direction of arrow A, in Figure 4 a view in arrow direction B and in Figure 5 a schematic diagram or a so-called equivalent circuit diagram .
  • 10 denotes the housing of a gear pump, in whose interior 11, which is approximately glasses-shaped in cross section, two gear wheels 12, 13 mesh with one another in external engagement.
  • the shafts 14, 15 of the gearwheels are mounted in bearing bodies 16, 17, which are also approximately spectacle-shaped and are arranged in the housing.
  • the housing 10 is sealed on both sides by covers 18, 19.
  • the shaft 14 of the gear wheel 12 has a shaft extension 20, which penetrates through a bore 21 formed in the cover 19 with a shaft seal 22 and serves to drive the gear pump.
  • a thin sealing plate 23 made of metallic material, which exactly follows the contour of the interior and which extends as far as the shafts.
  • the pressure field 25 lies radially within the pressure field 26; both pressure fields do not extend all the way to the low-pressure side ND, which is characterized by an inlet bore 30; this penetrates at the level of the gears in the housing interior 11.
  • the outlet bore 31 runs in the same axis as this on the opposite side of the housing.
  • the pressure field 26 is connected to the high-pressure side HD via a recess 32 formed between the housing interior and the bearing body.
  • the pressure field 25 is acted upon by an external pressure source via a bore 33 penetrating the bearing body 16 and channels 34 in the cover 18. This is a controlled pressure.
  • the remaining surface 36 of the bearing body 16 is relieved by a recess 37 extending between the latter and the housing interior to the inlet bore 30.
  • the bearing bodies 16, 17 together with the sealing plate 23 are arranged in the housing 10 with little axial play.
  • the bearing bodies 16, 17 are shown in more detail in FIGS. 3 and 4. Reference is first made to the bearing body 16. This has a flat recess 40 on its end face facing the cover 18, which extends around both the bores 41, 42 receiving the shafts and forms a self-contained field which also has approximately the shape has glasses. A bushing 43, 44 is received in the bores 41, 42, each bushing having two wide longitudinal grooves 45, 46 and 47, 48, respectively, which extend over the entire height of the bushings.
  • the bearing body 17 is largely designed in the same way as the bearing body 16, that is to say it has a flat recess 49 on its end face facing the cover 19, which extends around the bores 50, 51 receiving the shafts and is closed in itself.
  • FIG. 5 shows an equivalent circuit diagram or basic circuit diagram for the gear pump. It draws in pressure medium from a container 59 via a suction line 60 and displaces it into a delivery line 61.
  • a bypass line 62 runs around the pump, in which the sealing plate 23 is symbolically represented as a throttle. Behind the throttle 23, the bypass line branches into the branches 62A, 62B, the first of which opens into the suction line and the second leads to the container 59.
  • the gear pump When the gear pump is in operation, it sucks pressure medium through the inlet bore 30 and displaces it into the outlet bore 31.
  • the pressure control of the pressure field 25, as stated above, results in the sealing plate 23 resting or lifting off the side surfaces of the gear wheels. Depending on how far the sealing plate has lifted, a more or less large flow of pressure medium flows from the high pressure to the low pressure side. A simple and cheap flow control of the gear pump can thus be achieved.
  • a sealing plate 23 can also be reached on both gearwheel sides with control by corresponding pressure fields 25, 26.
  • the shape and number of the pressure fields acting on the sealing plate is arbitrary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP19900119951 1989-11-16 1990-10-18 Pompe à engrenages Withdrawn EP0427973A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3938135 1989-11-16
DE19893938135 DE3938135A1 (de) 1989-11-16 1989-11-16 Zahnradpumpe

Publications (1)

Publication Number Publication Date
EP0427973A1 true EP0427973A1 (fr) 1991-05-22

Family

ID=6393668

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900119951 Withdrawn EP0427973A1 (fr) 1989-11-16 1990-10-18 Pompe à engrenages

Country Status (2)

Country Link
EP (1) EP0427973A1 (fr)
DE (1) DE3938135A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6554594B2 (en) * 2001-01-24 2003-04-29 Kabushiki Kaisha Toyota Jidoshokki Shaft seal structure for vacuum pump
US8747909B2 (en) 2003-04-09 2014-06-10 Osmose, Inc. Micronized wood preservative formulations
CN104364528A (zh) * 2012-06-28 2015-02-18 株式会社日立制作所 齿轮泵

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19942297A1 (de) * 1999-09-04 2001-03-08 Bosch Gmbh Robert Zahnradmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1172959B (de) * 1957-04-09 1964-06-25 Bosch Gmbh Robert Zahnradpumpe oder Zahnradmotor
GB1010132A (en) * 1962-09-01 1965-11-17 Parker Hannifin Corp Improvements in rotary gear pumps
GB1172579A (en) * 1966-08-15 1969-12-03 Borg Warner Pressure Loaded Hydraulic Gear Pumps or Motors
FR2025236A1 (fr) * 1968-12-04 1970-09-04 Borg Warner
GB1386237A (en) * 1971-05-18 1975-03-05 Dowty Hydraulic Units Ltd Rotary positive-displacement hydraulic machines
DE8806388U1 (de) * 1987-09-10 1989-01-12 Robert Bosch Gmbh, 7000 Stuttgart Zahnradmotor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1172959B (de) * 1957-04-09 1964-06-25 Bosch Gmbh Robert Zahnradpumpe oder Zahnradmotor
GB1010132A (en) * 1962-09-01 1965-11-17 Parker Hannifin Corp Improvements in rotary gear pumps
GB1172579A (en) * 1966-08-15 1969-12-03 Borg Warner Pressure Loaded Hydraulic Gear Pumps or Motors
FR2025236A1 (fr) * 1968-12-04 1970-09-04 Borg Warner
GB1386237A (en) * 1971-05-18 1975-03-05 Dowty Hydraulic Units Ltd Rotary positive-displacement hydraulic machines
DE8806388U1 (de) * 1987-09-10 1989-01-12 Robert Bosch Gmbh, 7000 Stuttgart Zahnradmotor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6554594B2 (en) * 2001-01-24 2003-04-29 Kabushiki Kaisha Toyota Jidoshokki Shaft seal structure for vacuum pump
US8747909B2 (en) 2003-04-09 2014-06-10 Osmose, Inc. Micronized wood preservative formulations
CN104364528A (zh) * 2012-06-28 2015-02-18 株式会社日立制作所 齿轮泵
US20150337836A1 (en) * 2012-06-28 2015-11-26 Hitachi, Ltd. Gear Pump
US9644627B2 (en) * 2012-06-28 2017-05-09 Hitachi, Ltd. Gear pump
CN104364528B (zh) * 2012-06-28 2018-07-10 株式会社日立制作所 齿轮泵

Also Published As

Publication number Publication date
DE3938135A1 (de) 1991-05-23

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): DE FR GB IT

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Effective date: 19911017

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Owner name: ROBERT BOSCH GMBH

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Effective date: 19920403

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Effective date: 19920814