EP0667453A1 - Zahnrad für Zahnradpumpen - Google Patents

Zahnrad für Zahnradpumpen Download PDF

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Publication number
EP0667453A1
EP0667453A1 EP95420030A EP95420030A EP0667453A1 EP 0667453 A1 EP0667453 A1 EP 0667453A1 EP 95420030 A EP95420030 A EP 95420030A EP 95420030 A EP95420030 A EP 95420030A EP 0667453 A1 EP0667453 A1 EP 0667453A1
Authority
EP
European Patent Office
Prior art keywords
gear
flat
matrix
distance
toothing
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.)
Granted
Application number
EP95420030A
Other languages
English (en)
French (fr)
Other versions
EP0667453B1 (de
Inventor
Henri Gueydan
Gérard Puente
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.)
Sintertech SAS
Original Assignee
Sintertech SAS
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 Sintertech SAS filed Critical Sintertech SAS
Publication of EP0667453A1 publication Critical patent/EP0667453A1/de
Application granted granted Critical
Publication of EP0667453B1 publication Critical patent/EP0667453B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/16—Both compacting and sintering in successive or repeated steps
    • B22F3/164—Partial deformation or calibration
    • B22F2003/166—Surface calibration, blasting, burnishing, sizing, coining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/20—Manufacture essentially without removing material
    • F04C2230/22—Manufacture essentially without removing material by sintering

Definitions

  • the invention relates to a gear for a gear pump and a manufacturing method.
  • the gears of gear pumps are generally obtained by powder metallurgy.
  • the gears according to the invention therefore comprise an external surface forming the toothing and 2 parallel lateral faces, on which there is in relief a continuous and closed rib, located in the vicinity of the toothing, of any section, and carrying at its top a flat width 1 between 0.5 and 2 mm.
  • This flat is located at a distance d from the outer edge of the gear, generally between 0 and 5 mm, preferably between 0 and 2.5 mm, and more particularly at 0.5 mm ⁇ 0.1 mm.
  • the powder is compressed in a tool comprising an annular matrix with the design of the teeth and 2 punches carrying in hollow, on each of their active surfaces, a concave groove, continuous and closed on itself, located in line with the final ribs.
  • These ribs preferably have a convex shape in cross section, with positive undercuts, such as triangle, trapezoid, 1 ⁇ 2 hexagon, 1 ⁇ 2 circle, 1 ⁇ 2 ellipse, allowing its easy extraction of tools.
  • positive undercuts such as triangle, trapezoid, 1 ⁇ 2 hexagon, 1 ⁇ 2 circle, 1 ⁇ 2 ellipse, allowing its easy extraction of tools.
  • the distance between the lateral faces is such that, given the sintering shrinkage, it is slightly less than that of the gear housing in the pump, the distance between the tops of the ribs being slightly greater than that -this.
  • the sintered gear is then cold calibrated in an annular matrix using 2 lower and upper punches to ensure the final geometry of the teeth. These punches do not occupy the entire lateral surface of the gear and leave free an outer ring sparing the ribs.
  • the calibrated sintered part undergoes a slight plastic deformation of the top of the ribs between 2 punches with parallel faces, perpendicular to the axis, to bring the dimension between the flats of the ribs to the desired value.
  • This dimension is determined using a mechanical stop, on a hydraulic press or a mechanical press with hydraulic adapter.
  • FIG. 1 represents a gear 1 according to the invention comprising an external toothing 2 of a primitive circle 7 and two lateral faces 3 and 4 (fig. 2).
  • a rib 5 On each of the lateral faces is a rib 5, the profile of which is shown in 6, about 1mm in width, 0.3mm in height and situated approximately 0.5mm from the edge of the toothing 2.
  • FIG. 3 represents the device for compressing the powder in which an annular matrix 10, of axis 11, a lower punch 15, of the same axis 11, is recognized, comprising a circular groove 12i in the form of a half-torus whose dimensions are reported in fig.4 and an upper punch 13, of the same axis 11, also provided with an identical circular groove 12s.
  • the compressed part is shown at 14.
  • the part 14 is calibrated in an annular die 20 (fig. 5), between two lower 21 and upper 22 punches, having at their flat ends an annular recess 23 (fig. 6).
  • annular die 20 fig. 5
  • lower 21 and upper 22 punches having at their flat ends an annular recess 23
  • FIG. 6 there is shown at 24 in dotted lines, the profile of the part 14, before calibration.
  • the toothing (2) has its final geometry and surface condition.
  • the calibrated part is then placed in a flat bottom finishing matrix 17 (fig. 7) where it is crushed by a flat punch 18, the stroke of the latter being limited by the matrix itself forming a stop, which prints on the ribs 5 the flats 6, at a very precise distance h from each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)
  • Gears, Cams (AREA)
EP95420030A 1994-02-15 1995-02-13 Zahnrad für Zahnradpumpen und Herstellungsverfahren Expired - Lifetime EP0667453B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9401948A FR2716240B1 (fr) 1994-02-15 1994-02-15 Engrenage de pompe à engrenages et procédé d'obtention.
FR9401948 1994-02-15

Publications (2)

Publication Number Publication Date
EP0667453A1 true EP0667453A1 (de) 1995-08-16
EP0667453B1 EP0667453B1 (de) 1998-07-01

Family

ID=9460274

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95420030A Expired - Lifetime EP0667453B1 (de) 1994-02-15 1995-02-13 Zahnrad für Zahnradpumpen und Herstellungsverfahren

Country Status (3)

Country Link
EP (1) EP0667453B1 (de)
DE (1) DE69503158T2 (de)
FR (1) FR2716240B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101809289B (zh) * 2007-09-07 2015-05-06 Gkn烧结金属有限公司 精密粉末金属部件、组件和方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2403796A (en) * 1943-05-15 1946-07-09 Hanna Engineering Works Gear pump
FR1241456A (fr) * 1958-11-24 1960-09-16 Bayer Ag Engrenages en matière synthétique
DE2847710A1 (de) * 1978-11-03 1980-05-14 Bosch Gmbh Robert Zahnradmaschine (pumpe oder hydromotor)
JPS58217788A (ja) * 1982-06-10 1983-12-17 Taiho Kogyo Co Ltd 回転型オイルポンプ
EP0549057A1 (de) * 1991-12-23 1993-06-30 VOLVO CAR SINT-TRUIDEN, naamloze vennootschap Zahnräder, Verfahren zur ihrer Herstellung und damit ausgestattete Zahnradpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2403796A (en) * 1943-05-15 1946-07-09 Hanna Engineering Works Gear pump
FR1241456A (fr) * 1958-11-24 1960-09-16 Bayer Ag Engrenages en matière synthétique
DE2847710A1 (de) * 1978-11-03 1980-05-14 Bosch Gmbh Robert Zahnradmaschine (pumpe oder hydromotor)
JPS58217788A (ja) * 1982-06-10 1983-12-17 Taiho Kogyo Co Ltd 回転型オイルポンプ
EP0549057A1 (de) * 1991-12-23 1993-06-30 VOLVO CAR SINT-TRUIDEN, naamloze vennootschap Zahnräder, Verfahren zur ihrer Herstellung und damit ausgestattete Zahnradpumpe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 8, no. 69 (M - 286)<1506> 31 March 1984 (1984-03-31) *

Also Published As

Publication number Publication date
DE69503158D1 (de) 1998-08-06
FR2716240A1 (fr) 1995-08-18
FR2716240B1 (fr) 1996-04-12
EP0667453B1 (de) 1998-07-01
DE69503158T2 (de) 1999-04-01

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