EP0667453B1 - Engrenage de pompe à engrenage et procédé d'obtention - Google Patents
Engrenage de pompe à engrenage et procédé d'obtention Download PDFInfo
- Publication number
- EP0667453B1 EP0667453B1 EP95420030A EP95420030A EP0667453B1 EP 0667453 B1 EP0667453 B1 EP 0667453B1 EP 95420030 A EP95420030 A EP 95420030A EP 95420030 A EP95420030 A EP 95420030A EP 0667453 B1 EP0667453 B1 EP 0667453B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gear
- gear wheel
- wheel according
- teeth
- flat
- 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.)
- Expired - Lifetime
Links
Images
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 subject of the invention is a gear for a gear pump and a manufacturing process.
- Gear pump gears especially those used in the automotive industry, are generally obtained by metallurgy powders.
- application EP-A-549057 describes a process in which the precise dimensioning of the surface of the teeth of a gear wheel for pump, obtained by sintering, is carried out using a gauge and by sanding said surface; this process makes it possible to obtain wheels teeth which, when they are mutually meshed, work silently.
- 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 .
- the flat is of width l 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 a matrix annular to the design of the teeth and 2 punches bearing recessed, on each of their active surfaces, a concave groove, continuous and closed on itself, located to the right of 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 geometry final teeth. These punches do not occupy the entire surface side of the gear and leave an outer ring free 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 at the desired value.
- This rating 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 a external teeth 2 of primitive circle 7 and two lateral faces 3 and 4 (fig. 2). On each of the side faces is a rib 5, the profile is shown in 6, about 1mm wide, 0.3mm high and located approximately 0.5 mm from the edge of the toothing 2.
- FIG. 3 represents the device for compressing the powder in which we recognize an annular matrix 10, axis 11, a punch lower 15, of the same axis 11, having a circular groove 12i in shape of half-torus whose dimensions are given in fig. 4 and a upper punch 13, of the same axis 11, also provided with a groove identical 12s circular.
- 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 finishing matrix to flat bottom 17 (fig. 7) where it is crushed by a flat punch 18, the stroke thereof being limited by the matrix itself forming a stop, which prints on the ribs 5 the flats 6, at a distance h very specifies one of the other.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Description
Ce méplat est situé à une distance d du bord externe de l'engrenage, généralement comprise entre 0 et 5 mm, de préférence entre 0 et 2,5 mm, et plus particulièrement à 0,5 mm ± 0,1 mm.
- compression de la poudre
- frittage de l'ébauche comprimée
- et calibrage de la pièce frittée.
Lors de cette compression, la distance entre les faces latérales est telle que, compte tenu du retrait au frittage, elle est légèrement inférieure à celle du logement de l'engrenage dans la pompe, la distance entre les sommets des nervures étant légèrement supérieure à celle-ci.
- La fig. 1 représente, en plan, une vue partielle de l'engrenage suivant l'invention.
- La fig. 2 représente une coupe détaillée selon la section I.I de la fig.1.
- Les fig. 3 à 6 représentent différentes phases de la fabrication de
l'engrenage suivant l'invention en coupe suivant la ligne II-II de la
fig. 1
- la fig. 3 montre une vue en coupe de la disposition générale des outillages de compression
- la fig. 4 donne le détail de la rainure de la fig.3
- la fig. 5 représente une vue en coupe de la phase de calibrage
- la fig. 6 montre une vue en coupe du détail A de la fig. 5.
- la fig. 7 représente une vue en coupe des outillages de finition.
Après calibrage, la denture (2) possède sa géométrie et son état de surface définitifs.
Claims (6)
- Engrenage de pompe à engrenages comportant une denture (2) et deux faces latérales (3,4) caractérisé en ce que chaque surface latérale porte une nervure en relief (5) continue et fermée sur elle-même, située au voisinage de la denture et présentant à son sommet un méplat (6).
- Engrenage selon la revendication 1 caractérisé en ce que le méplat a une largeur l comprise entre 0,5 et 2 mm.
- Engrenage selon l'une des revendications 1 ou 2, caractérisé en ce que le méplat est à une distance d du bord de la denture comprise entre 0 et 5 mm.
- Engrenage selon la revendication 3 caractérisé en ce que la distance d est comprise entre 0 et 2,5mm.
- Engrenage selon la revendication 4 caractérisé en ce que la distance d est de 0,5 mm ± 0,1 mm.
- Procédé de fabrication d'un engrenage, selon l'une des revendications 1 à 5, comportant les opérations de compression, de frittage et de calibrage à froid, caractérisé en ce que la poudre est comprimée dans un outillage comprenant une matrice (10) et des poinçons (13,15) portant sur leur face active une rainure (12i-12s) concave, continue et fermée sur elle-même, et en ce qu'après frittage, l'ébauche est calibrée à froid dans une première matrice (20), puis mise à la cote finale dans une deuxième matrice de finition (17), par déformation plastique à froid, du sommet des nervures (5).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9401948 | 1994-02-15 | ||
FR9401948A FR2716240B1 (fr) | 1994-02-15 | 1994-02-15 | Engrenage de pompe à engrenages et procédé d'obtention. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0667453A1 EP0667453A1 (fr) | 1995-08-16 |
EP0667453B1 true EP0667453B1 (fr) | 1998-07-01 |
Family
ID=9460274
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95420030A Expired - Lifetime EP0667453B1 (fr) | 1994-02-15 | 1995-02-13 | Engrenage de pompe à engrenage et procédé d'obtention |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0667453B1 (fr) |
DE (1) | DE69503158T2 (fr) |
FR (1) | FR2716240B1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2188529A2 (fr) * | 2007-09-07 | 2010-05-26 | GKN Sinter Metals, Inc. | Composant de poudre métallique précis, assemblage et procédé |
Family Cites Families (5)
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 |
BE1005543A3 (nl) * | 1991-12-23 | 1993-09-28 | Volvo Car Sint Truiden Nv | Werkwijze voor het vervaardigen van tandwielen, tandwielen hierdoor bekomen en tandwielpomp hiermee uitgerust. |
-
1994
- 1994-02-15 FR FR9401948A patent/FR2716240B1/fr not_active Expired - Fee Related
-
1995
- 1995-02-13 DE DE69503158T patent/DE69503158T2/de not_active Expired - Fee Related
- 1995-02-13 EP EP95420030A patent/EP0667453B1/fr not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2188529A2 (fr) * | 2007-09-07 | 2010-05-26 | GKN Sinter Metals, Inc. | Composant de poudre métallique précis, assemblage et procédé |
EP2188529A4 (fr) * | 2007-09-07 | 2014-03-05 | Gkn Sinter Metals Inc | Composant de poudre métallique précis, assemblage et procédé |
Also Published As
Publication number | Publication date |
---|---|
DE69503158T2 (de) | 1999-04-01 |
FR2716240A1 (fr) | 1995-08-18 |
EP0667453A1 (fr) | 1995-08-16 |
FR2716240B1 (fr) | 1996-04-12 |
DE69503158D1 (de) | 1998-08-06 |
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