US20140255236A1 - Internal gear pump - Google Patents

Internal gear pump Download PDF

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Publication number
US20140255236A1
US20140255236A1 US14/202,027 US201414202027A US2014255236A1 US 20140255236 A1 US20140255236 A1 US 20140255236A1 US 201414202027 A US201414202027 A US 201414202027A US 2014255236 A1 US2014255236 A1 US 2014255236A1
Authority
US
United States
Prior art keywords
pinion
bearing
internal gear
gear pump
pump
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.)
Abandoned
Application number
US14/202,027
Other languages
English (en)
Inventor
Massimiliano Ambrosi
Michael Eisenlauer
Rene Schepp
Norbert Alaze
Edgar Kurz
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
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALAZE, NORBERT, AMBROSI, MASSIMILIANO, EISENLAUER, MICHAEL, KURZ, EDGAR, SCHEPP, RENE
Publication of US20140255236A1 publication Critical patent/US20140255236A1/en
Abandoned 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/101—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with a crescent-shaped filler element, located between the inner and outer intermeshing members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/02—Arrangements of bearings
    • 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
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • 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
    • F04C2240/00—Components
    • F04C2240/50—Bearings
    • F04C2240/56—Bearing bushings or details thereof

Definitions

  • the description relates to an internal gear pump for a hydraulic vehicle brake system having the features described below.
  • Internal gear pumps of this kind are used instead of conventionally used piston pumps in slip-controlled and/or power-operated vehicle brake systems and are often referred to, though not necessarily correctly, as return pumps.
  • Internal gear pumps are known. They have an annulus and a pinion, which is arranged eccentrically in the annulus and meshes over a segment of the circumference with the annulus.
  • the annuluses are internally toothed gear wheels, the pinions are externally toothed gearwheels, and the annulus and the pinion can also be regarded as gearwheels of the internal gear pumps.
  • the terms “pinion” and “annulus” are used to distinguish between them. Opposite the segment of the circumference over which the gearwheels mesh there is a crescent-shaped free space between the annulus and the pinion, which is here referred to as a pump space.
  • a dividing element Arranged in the pump space is a dividing element, on the outside and inside of which tooth tips of the two gearwheels rest and which divides the pump space into a suction space and a pressure space.
  • the dividing element is often also referred to as a crescent or a crescent element.
  • Another name for the dividing element is “filler piece”.
  • the gearwheels When driven in rotation, the gearwheels pump fluid from the suction space into the pressure space.
  • the prior art also includes internal gear pumps without a dividing element, and these can be referred to as gear ring pumps for the sake of distinguishing them.
  • German Offenlegungsschrift DE 43 22 239 A1 discloses an internal gear pump, the pinion of which is arranged rigidly on a pump shaft, which is provided for the purpose of driving the pinion in rotation and, via the pinion, the annulus that meshes with the pinion.
  • the pump shaft On both sides of the pinion, the pump shaft is rotatably mounted in sliding bearings, which are press-fitted into a pump housing.
  • the internal gear pump having the features described below, has an annulus, a pinion meshing with the annulus, and a pump shaft for driving the pinion and the annulus in rotation.
  • a bearing is arranged within the pinion to provide rotatable mounting of the pump shaft, i.e. the bearing is situated in one plane with the pinion and not to the side of the pinion, for instance.
  • the bearing can be longer in the axial direction than the width of the pinion and can project from the pinion on one or both sides.
  • the bearing passes through a central hole in the pinion, in particular the pinion is mounted rotatably in the bearing and/or the pump shaft is mounted rotatably on the bearing, which is embodied as a bearing bush, for example.
  • Arranging the bearing within the pinion shortens an overall length of the internal gear pump.
  • a further advantage is radial support for the pinion by the bearing in the plane of the pinion in which an inward-directed force acts on the pinion during the operation of the internal gear pump, said force being exerted on the pinion by fluid from the outside, which is pumped by the internal gear pump and is under pressure in the pressure space between the pinion and the annulus.
  • the radial force acting on the pinion is supported without a moment about an axis transverse to the pump shaft by the bearing arranged within the pinion.
  • This has the additional advantage that the pump shaft is not subjected to bending stress by the radial force acting on the pinion, and this improves pump running and reduces bearing wear.
  • the pump shaft is not subjected to bending stress, there is no angular and radial misalignment of a driving wheel, generally a gearwheel, which is fitted for conjoint rotation on the pump shaft to drive the pump shaft in rotation. This improves truth of running of the internal gear pump and reduces wear, friction and noise generation at the driving wheel.
  • the disclosure improves accuracy of position and truth of running of the pump shaft. The disclosure allows larger production tolerances.
  • At least one embodiment of the disclosure includes a bearing which is integral with a housing of the internal gear pump, thereby eliminating a separate bearing and the assembly thereof.
  • At least one embodiment of the disclosure relates to a catch, which connects the pinion to the pump shaft for conjoint rotation.
  • This embodiment allows rotatable mounting of the pinion on the outside of the bearing and of the pump shaft in the bearing.
  • the catch can be arranged laterally on the pinion and adjacent to the bearing.
  • the pump shaft can pass through the catch or the catch can be arranged on one end of the pump shaft.
  • the disclosure provides a housing made of cast iron, e.g. gray cast iron. This material is good for primary forming and machining and is a good bearing material. It can be provided with permanent lubrication in the region of the bearing.
  • cast iron e.g. gray cast iron. This material is good for primary forming and machining and is a good bearing material. It can be provided with permanent lubrication in the region of the bearing.
  • At least one embodiment of the disclosure provides for the pinion not to be arranged directly on the pump shaft but, as already described, for the pinion to be on the outside of the bearing and the pump shaft in the bearing, for example, the bearing thus being situated between the pinion and the pump shaft.
  • the internal gear pump according to the disclosure is provided as a hydraulic pump for a hydraulic slip-controlled and/or power-operated vehicle brake system instead of a conventionally used piston pump.
  • hydraulic pumps are also referred to as return pumps.
  • a housing of the internal gear pump according to the disclosure is configured for installation, insertion or press-fitting in a receptacle provided for this purpose in a hydraulic block of a slip control system.
  • the housing of the internal gear pump can also be regarded as a cartridge.
  • FIGURE shows an internal gear pump according to the disclosure in a perspective section along the axis.
  • the internal gear pump 1 has an internally toothed gearwheel, here referred to as annulus 2 , and an externally toothed gearwheel, here referred to as pinion 3 , which is arranged eccentrically in the annulus 2 in such a way that it meshes with the annulus 2 .
  • the two gearwheels 2 , 3 have parallel axes, have the same width and are arranged in the same plane.
  • the annulus 2 is press-fitted into a bearing ring 4 , which is rotatably mounted in a sliding manner in a housing 5 .
  • the pinion 3 is rotatably mounted in a sliding manner on a bearing 6 , which, in the embodiment of the disclosure illustrated and described, is a hollow cylinder, i.e.
  • the bearing 6 is an integral part of the housing 5 of the internal gear pump 1 . Because of its good machining properties and suitability as a bearing material, the housing 5 and hence also the bearing 6 integral with the housing 5 is composed of gray cast iron and is provided with permanent lubrication on the inside and the outside of the bearing 6 . Gray cast iron for the housing 5 of the internal gear pump 1 according to the disclosure is not essential;
  • the housing 5 with the bearing 6 can also be composed of some other metallic or nonmetallic material.
  • a segment of the circumference in which the gearwheels 2 , 3 mesh with one another has been cut away in the illustrated section along the axis and is therefore not visible.
  • the figure shows a segment of the circumference of the gearwheels 2 , 3 in which the gearwheels 2 , 3 do not mesh with one another.
  • this segment of the circumference there is a crescent-shaped gap between the annulus 2 and the pinion 3 , this being referred to here as the pump space 7 .
  • a dividing element 8 Arranged in the pump space 7 is a dividing element 8 , which divides the pump space 7 into a suction space 9 and a pressure space 10 .
  • the dividing element 8 is crescent-shaped and is therefore also referred to as a crescent or crescent element, another designation for the dividing element 8 being “filler piece”.
  • the dividing element 8 is the same width as the gearwheels 2 , 3 and its outside and inside have a convex and concave cylindrical curvature, respectively, such that tooth tips of teeth of the gearwheels 2 , 3 rest on the outside and the inside of the dividing element 8 .
  • the gearwheels 2 , 3 When the gearwheels 2 , 3 are driven in rotation, the tooth tips of the teeth of the gearwheels 2 , 3 slide along the outside and the inside of the dividing element 8 , and the gearwheels 2 , 3 pump fluid in the gaps between the teeth in a manner known per se on the outside and inside of the dividing element 8 from the suction space 9 to the pressure space 10 .
  • the internal gear pump 1 When the internal gear pump 1 is used as a hydraulic pump of a hydraulic vehicle brake system, the fluid is a liquid, namely brake fluid.
  • Axial disks 11 that are fixed against relative rotation and capable of axial movement are arranged on both sides of the gearwheels 2 , 3 and of the dividing element 8 , resting on side faces of the gearwheels 2 , 3 and of the dividing element 8 and covering the pump space 7 laterally, at least in the region of the pressure space 10 and of the dividing element 8 .
  • the upper axial disk is not depicted because it would conceal the gearwheels 2 , 3 and the dividing element 8 of the internal gear pump 1 .
  • Such axial disks 11 are known per se and are also referred to as control disks or pressure plates.
  • the internal gear pump 1 has a pump shaft 12 , which is rotatably mounted in a sliding manner in the tubular bearing 6 .
  • the pump shaft 12 is sealed off in the housing 5 by a shaft sealing ring 13 and, on the side of the shaft sealing ring 13 facing away from the pinion 3 , is rotatably mounted in the housing 5 by means of a further bearing 14 .
  • the further bearing 14 is a ball bearing, but this is not essential for the disclosure.
  • a gearwheel as a driving wheel 15 is press-fitted onto the end of the pump shaft 12 or secured for conjoint rotation in some other way on the pump shaft 12 at one end of the housing 5 .
  • the bearing 6 is situated within the pinion 3 , passing through a central hole in the pinion 3 , which is referred to here as bearing hole 20 and by means of which the pinion 3 is rotatably mounted in a sliding manner on the bearing 6 , with sliding bearing being preferred but not essential for the disclosure.
  • the internal gear pump 1 has a catch 16 , which connects the pinion 3 for conjoint rotation to the pump shaft 12 .
  • the catch 16 is arranged on an end of the pump shaft 12 remote from the driving wheel 15 .
  • the catch 16 is a stamped and bent sheet metal component or a deep drawn component which is triangular or has the shape of a three-pointed star, which has tabs 17 bent at right angles at its corners that engage in pockets in the bearing hole 20 of the pinion 3 , thereby ensuring that the catch 16 is secured to the pinion 3 for conjoint rotation.
  • the pockets are shallow recesses in the bearing hole 16 of the pinion 3 .
  • the catch 16 overlaps an annular end face of the bearing 6 and, in its center, has a shallow hoop 18 , which is approximately square when viewed in the axial direction, is formed by deep drawing and engages in a square countersunk hole 19 in the center of the end of the pump shaft 12 .
  • the hoop 18 which is integral with the catch 16 , connects the catch 16 to the pump shaft 12 for conjoint rotation by positive engagement in the square countersunk hole 19 .
  • the internal gear pump 1 is press-fitted by means of its cylindrical housing 5 , which can also be regarded as a cartridge, into a complementary cylindrical receptacle of a hydraulic block (not shown).
  • Such hydraulic blocks are known per se from slip control systems of hydraulic vehicle brake systems. They are typically block-shaped parts made of aluminum having two receptacles for two internal gear pumps 1 and further receptacles for hydraulic components of the slip control system, such as solenoid valves and hydraulic accumulators. The receptacles or the hydraulic components inserted therein are hydraulically interconnected by means of bores in the hydraulic block.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
US14/202,027 2013-03-11 2014-03-10 Internal gear pump Abandoned US20140255236A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013204071.7 2013-03-11
DE102013204071.7A DE102013204071A1 (de) 2013-03-11 2013-03-11 Innenzahnradpumpe

Publications (1)

Publication Number Publication Date
US20140255236A1 true US20140255236A1 (en) 2014-09-11

Family

ID=51385588

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/202,027 Abandoned US20140255236A1 (en) 2013-03-11 2014-03-10 Internal gear pump

Country Status (4)

Country Link
US (1) US20140255236A1 (fr)
JP (1) JP6420050B2 (fr)
DE (1) DE102013204071A1 (fr)
FR (1) FR3002989A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180238325A1 (en) * 2015-09-11 2018-08-23 Aisin Seiki Kabushiki Kaisha Electric pump and method for producing same
US20190170140A1 (en) * 2016-08-09 2019-06-06 Nidec Corporation Drive device
KR20210145716A (ko) 2019-04-01 2021-12-02 니폰 덴키 가라스 가부시키가이샤 Li2O-Al2O3-SiO2계 결정화 유리

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016214762A1 (de) * 2016-08-09 2018-02-15 Robert Bosch Gmbh Außenzahnradmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152551A (en) * 1963-01-25 1964-10-13 Viking Pump Company Pump
US6179595B1 (en) * 1998-05-27 2001-01-30 Luk Getriebe-Systeme Gmbh Hydraulic gear machine having a transmission shaft in a bearing tube
US20010026767A1 (en) * 2000-03-27 2001-10-04 Masatoshi Takagi Trochoid gear type fuel pump
US6736609B2 (en) * 2001-03-19 2004-05-18 Fukui Prefecture Support apparatus for movable member and pump apparatus
US7641457B2 (en) * 2006-03-28 2010-01-05 Jtekt Corporation Internal gear pump
US20100130327A1 (en) * 2008-11-25 2010-05-27 Toyota Motor Engineering & Manufacturing North America, Inc. Multi-Drive Fluid Pump

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322239C2 (de) 1993-07-03 1997-04-24 Eckerle Rexroth Gmbh Co Kg Innenzahnradmaschine (Pumpe oder Motor)
JP2006161777A (ja) * 2004-12-10 2006-06-22 Matsushita Electric Ind Co Ltd 冷媒ポンプ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152551A (en) * 1963-01-25 1964-10-13 Viking Pump Company Pump
US6179595B1 (en) * 1998-05-27 2001-01-30 Luk Getriebe-Systeme Gmbh Hydraulic gear machine having a transmission shaft in a bearing tube
US20010026767A1 (en) * 2000-03-27 2001-10-04 Masatoshi Takagi Trochoid gear type fuel pump
US6736609B2 (en) * 2001-03-19 2004-05-18 Fukui Prefecture Support apparatus for movable member and pump apparatus
US7641457B2 (en) * 2006-03-28 2010-01-05 Jtekt Corporation Internal gear pump
US20100130327A1 (en) * 2008-11-25 2010-05-27 Toyota Motor Engineering & Manufacturing North America, Inc. Multi-Drive Fluid Pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180238325A1 (en) * 2015-09-11 2018-08-23 Aisin Seiki Kabushiki Kaisha Electric pump and method for producing same
US20190170140A1 (en) * 2016-08-09 2019-06-06 Nidec Corporation Drive device
US10941768B2 (en) * 2016-08-09 2021-03-09 Nidec Corporation Drive device
KR20210145716A (ko) 2019-04-01 2021-12-02 니폰 덴키 가라스 가부시키가이샤 Li2O-Al2O3-SiO2계 결정화 유리

Also Published As

Publication number Publication date
FR3002989A1 (fr) 2014-09-12
JP2014173602A (ja) 2014-09-22
JP6420050B2 (ja) 2018-11-07
DE102013204071A1 (de) 2014-09-11

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AS Assignment

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:AMBROSI, MASSIMILIANO;EISENLAUER, MICHAEL;SCHEPP, RENE;AND OTHERS;SIGNING DATES FROM 20140407 TO 20140409;REEL/FRAME:033212/0151

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION