EP0250312B1 - Method of making pinions of which the tooth-driving surfaces form a sharp-edged angle - Google Patents
Method of making pinions of which the tooth-driving surfaces form a sharp-edged angle Download PDFInfo
- Publication number
- EP0250312B1 EP0250312B1 EP19870401345 EP87401345A EP0250312B1 EP 0250312 B1 EP0250312 B1 EP 0250312B1 EP 19870401345 EP19870401345 EP 19870401345 EP 87401345 A EP87401345 A EP 87401345A EP 0250312 B1 EP0250312 B1 EP 0250312B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- teeth
- tooth
- face
- tooth arrangement
- leading edge
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/28—Making machine elements wheels; discs
- B21K1/30—Making machine elements wheels; discs with gear-teeth
Definitions
- the invention relates to a method for producing a dog clutch teeth in the form of a crown, the leading edge of which forms a sharp edge angle according to the preamble of claim 1.
- Toothings of this type are, for example, used in the construction of gearboxes, the leading edge being constituted by the edge of the teeth which is directed towards, and which meshes with, another toothing. These two teeth are relatively movable and it is therefore important to form on the leading edge of the teeth considered a sharp edge angle allowing these two teeth to engage with each other during their relative movement.
- the publication WO-A-86-00838 describes a method of cold forging a dog clutch teeth previously mounted on a support.
- a semi-finished product is forged on its final cylindrical support before starting the forging and calibration process of the teeth.
- the object of the invention is to facilitate the preparation of the calibration toothing before it is mounted on the pinion.
- the third stamping operation is followed by a fourth stamping operation involving the flanks of the teeth delimiting the inter-tooth zones in order to form flanks of the bodies oriented opposite the vertices at an angle. lively leading edges.
- the pinion is produced by a cutting operation, the leading edge at a sharp angle being produced on the face of the pinion opposite to the leading face during the cutting operation.
- the present invention therefore has for purpose the realization by stamping of a dog clutch teeth whose leading edge of the teeth forms an angle with a sharp edge.
- This dog clutch teeth 1 thus comprises teeth 2, the leading edge 3 of which is oriented towards a lateral face of the dog clutch teeth, this leading edge being delimited (see FIG. 6) by two plane faces 4 and 5 inclined by relative to the axis XX of the tooth and forming between them a sharp edge 6.
- the axis XX passing through the apex 6 of the tooth is, in this example, located in its median plane and the two faces 4 and 5 of identical inclination, are symmetrical with respect to each other and form an angle "C".
- the first operation for making this interconnection toothing consists in cutting a blank (not shown) in a metal plate, this blank having at its periphery blanks of teeth of generally parallelepiped shape.
- the metal plate has a rounded 7 on the leading edges of the cutting punch and the leading edge 3 of the teeth will be formed on the opposite face of the blank.
- the metal plate undergoes a rectification operation of the two faces 8 and 9 in order to form perfectly flat faces and of desired spacing, so that this blank thus rectified can favorably undergo the subsequent stamping operations .
- the first stamping operation consists (see FIG. 3) of forming a first inclined flat face 10 on the tooth blank, this stamping being such that this flat face 10 intersects, by its upper part, the axis XX of the teeth including their midplane.
- the teeth of the clutch teeth then undergo a second stamping operation illustrated in FIG. 4, according to which a second face 11 is inclined relative to the axis XX of the teeth, this face 11 being intersecting with this axis XX so that the summit 12 demarcated by the two faces 10 and 11, is located on the side of the face 10.
- the face 10 is slightly displaced and deformed and takes a concave shape as shown at 101 in FIG. 4. This results from the operation of pushing back the metal located at 13, this metal being pushed, on the one hand, towards this face 10, on the other hand, towards the inside of the tooth to fill perfectly the hollowed out parts of the matrix used.
- the dog clutch teeth then undergoes a third forging operation illustrated in FIG. 5, this third operation simultaneously involving the two faces 101 and 11 in order to form the two flat faces 4 and 5 of the leading edge 3 of the tooth and in order to refocus the edge 12 which becomes the edge 6 located in the median plane of the tooth containing the axis XX.
- This edge 6 is at a sharp angle and this due to the successive preliminary operations illustrated in Figures 3 and 4 without which such a sharp edge could not be obtained.
- the dog clutch teeth thus obtained provided with the desired leading edge may possibly undergo an additional stamping operation, illustrated in FIG. 6, having the effect of forming draft angles D on the lateral faces 14 and 15 located opposite l 'one of the other teeth, and delimiting between them the inter-tooth areas.
- these clearance angles D will be intended to compensate for any defects in the parallelism of the teeth of the pinions meshing with one another, taking account for example of the required clearances.
- each matrix has adapted male parts, delimiting the inter-tooth areas of the pinion and intended to hold the metal constituting these teeth during successive die-forging operations.
- the male parts of the dies delimiting the inter-tooth areas of the interconnection teeth are of reduced width from one operation to the next operation, in order to allow the introduction of the part into the matrix considered.
- leading edge 3 is located perpendicular to a lateral face of the dog clutch teeth.
- any other inclination may be adopted depending on the type of gear to be produced, the edge of this leading edge also being able to be parallel to the axis of the dog clutch teeth.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gears, Cams (AREA)
- Gear Processing (AREA)
- Forging (AREA)
- Mechanical Operated Clutches (AREA)
- Punching Or Piercing (AREA)
Description
L'invention concerne un procédé pour la réalisation d'une denture de crabotage sous la forme d'une couronne dont le bord d'attaque forme un angle à arête vive conforme au préambule de la revendication 1.The invention relates to a method for producing a dog clutch teeth in the form of a crown, the leading edge of which forms a sharp edge angle according to the preamble of claim 1.
Les dentures de ce type sont, par exemple, utilisées dans la construction de boîtes de vitesses, le bord d'attaque étant constitué par le bord des dents qui est dirigé vers, et qui engrène avec, une autre denture. Ces deux dentures sont mobiles relativement et il est donc important de former sur le bord d'attaque de la denture considérée un angle à arête vive permettant à ces deux dentures de venir en prise l'une avec l'autre lors de leur déplacement relatif.Toothings of this type are, for example, used in the construction of gearboxes, the leading edge being constituted by the edge of the teeth which is directed towards, and which meshes with, another toothing. These two teeth are relatively movable and it is therefore important to form on the leading edge of the teeth considered a sharp edge angle allowing these two teeth to engage with each other during their relative movement.
Jusqu'à présent, ce genre de dentures est réalisé par usinage et sont donc très onéreuses.So far, this kind of teeth are produced by machining and are therefore very expensive.
On a également tenté de réaliser ces dentures par matriçage mais cela sans succès car il a été jusqu'à présent impossible d'obtenir des dentures dont les faces du bord d'attaque forment entre elles un angle à arête vive.Attempts have also been made to form these toothing by die-forging, but this has been unsuccessful since it has hitherto been impossible to obtain toothing whose faces of the leading edge form an angle with a sharp edge between them.
La publication WO-A-86-00838 décrit un procédé de forgeage à froid d'une denture de crabotage préalablement montée sur un support.The publication WO-A-86-00838 describes a method of cold forging a dog clutch teeth previously mounted on a support.
Selon ce procédé on forge un semi-produit sur son support cylindrique définitif avant d'engager le processus de forgeage et de calibrage de la denture.According to this process, a semi-finished product is forged on its final cylindrical support before starting the forging and calibration process of the teeth.
L'invention a pour objet de faciliter la confection de la denture de calibrage avant son montage sur le pignon.The object of the invention is to facilitate the preparation of the calibration toothing before it is mounted on the pinion.
Conformément à l'invention on utilise un procédé conforme à la caractéristique de la revendication 1.In accordance with the invention, a method is used in accordance with the characteristic of claim 1.
Suivant une autre caractéristique de l'invention, la troisième opération de matriçage est suivie d'une quatrième opération de matriçage intéressant les flancs des dents délimitant les zones inter-dents afin de former des flancs des dépouilles orientées à l'opposé des sommets à angle vif des bords d'attaque.According to another characteristic of the invention, the third stamping operation is followed by a fourth stamping operation involving the flanks of the teeth delimiting the inter-tooth zones in order to form flanks of the bodies oriented opposite the vertices at an angle. lively leading edges.
Suivant une autre caractéristique de l' invention, le pignon est réalisé par une opération de découpage, le bord d'attaque à angle vif étant réalisé sur la face du pignon opposée à la face d'attaque lors de l'opération de découpage.According to another characteristic of the invention, the pinion is produced by a cutting operation, the leading edge at a sharp angle being produced on the face of the pinion opposite to the leading face during the cutting operation.
L'invention est représentée à titre d'exemples non limitatifs sur les dessins ci-joints dans lesquels :
- la figure 1 est une vue en élévation d'un pignon conforme à l'invention dont le bord d'attaque des dents forme un angle à arête vive,
- la figure 2 est une coupe partielle suivant A-A de la figure 1,
- les figures 3, 4, 5 et 6 sont des coupes d'une dent' établies suivant A-A de la figure 1 et illustrant les opérations successives subies par cette dent au cours de la fabrication du pignon.
- FIG. 1 is an elevation view of a pinion in accordance with the invention, the leading edge of the teeth forming an angle with a sharp edge,
- FIG. 2 is a partial section along AA of FIG. 1,
- Figures 3, 4, 5 and 6 are sections of a tooth 'established along AA of Figure 1 and illustrating the successive operations suffered by this tooth during the manufacture of the pinion.
La présente invention a, en conséquence, pour but la réalisation par matriçage d'une denture de crabotage dont le bord d'attaque des dents forme un angle à arête vive.The present invention therefore has for purpose the realization by stamping of a dog clutch teeth whose leading edge of the teeth forms an angle with a sharp edge.
Cette denture de crabotage 1 comporte ainsi des dents 2 dont le bord d'attaque 3 est orienté vers une face latérale de la denture de crabotage, ce bord d'attaque étant délimité (voir figure 6) par deux faces planes 4 et 5 inclinées par rapport à l'axe X-X de la dent et formant entre elles une arête vive 6. L'axe X-X passant par le sommet 6 de la dent est, dans cet exemple, situé dans son plan médian et les deux faces 4 et 5 d'inclinaison identique, sont symétriques l'une par rapport à l'autre et forment un angle "C".This dog clutch teeth 1 thus comprises
La première opération pour la confection de cette denture de crabotage consiste à découper une ébauche (non représentée) dans une plaque de métal, cette ébauche présentant à sa périphérie des ébauches de dents de forme générale parallélépipédique.The first operation for making this interconnection toothing consists in cutting a blank (not shown) in a metal plate, this blank having at its periphery blanks of teeth of generally parallelepiped shape.
Lors de cette opération de découpage fin, la plaque de métal présente un arrondi 7 sur les bords d'attaque du poinçon de découpage et le bord d'attaque 3 des dents sera formé sur la face opposée de l'ébauche. Après découpage fin de l'ébauche, celle-ci subit une opération de rectification des deux faces 8 et 9 afin de former des faces parfaitement planes et d'écartement désiré, de façon que cette ébauche ainsi rectifiée puisse subir favorablement les opérations ultérieures de matriçage.During this fine cutting operation, the metal plate has a rounded 7 on the leading edges of the cutting punch and the leading
La première opération de matriçage consiste (voir figure 3) à former une première face plane inclinée 10 sur l'ébauche de dent, ce matriçage étant tel que cette face plane 10 est sécante, par sa partie supérieure, de l'axe X-X des dents comprenant leur plan médian.The first stamping operation consists (see FIG. 3) of forming a first inclined
Les dents de la denture de crabotage subissent alors une seconde opération de matriçage illustrée sur la figure 4, selon laquelle on forme une seconde face 11 inclinée par rapport à l'axe X-X des dents, cette face 11 étant sécante de cet axe X-X de façon que le sommet 12 délimité par les deux faces 10 et 11, soit situé du côté de la face 10. On remarquera que, au cours de cette opération de matriçage de la face 11, la face 10 est légèrement déplacée et déformée et prend une forme concave comme cela est représenté en 10₁ sur la figure 4. Cela résulte de l'opération de repoussage du métal situé en 13, ce métal étant repoussé, d'une part, vers cette face 10, d'autre part, vers l'intérieur de la dent pour combler parfaitement les parties évidées de la matrice utilisée.The teeth of the clutch teeth then undergo a second stamping operation illustrated in FIG. 4, according to which a second face 11 is inclined relative to the axis XX of the teeth, this face 11 being intersecting with this axis XX so that the
La denture de crabotage subit ensuite une troisième opération de matriçage illustrée sur la figure 5, cette troisième opération intéressant simultanément les deux faces 10₁ et 11 afin de former les deux faces planes 4 et 5 du bord d'attaque 3 de la dent et afin de recentrer l'arête 12 qui devient l'arête 6 située dans le plan médian de la dent contenant l'axe X-X. Cette arête 6 est à angle vif et cela du fait des opérations successives préliminaires illustrées sur les figures 3 et 4 sans lesquelles une telle arête vive ne pourrait être obtenue.The dog clutch teeth then undergoes a third forging operation illustrated in FIG. 5, this third operation simultaneously involving the two
La denture de crabotage ainsi obtenue pourvue du bord d'attaque désiré, pourra éventuellement subir une opération complémentaire de matriçage, illustrée sur la figure 6, ayant pour effet de former des angles de dépouille D sur les faces latérales 14 et 15 situées en regard l'une de l'autre des dents, et délimitant entre elles les zones inter-dents.The dog clutch teeth thus obtained provided with the desired leading edge, may possibly undergo an additional stamping operation, illustrated in FIG. 6, having the effect of forming draft angles D on the
Dans le cas d'une boîte de vitesses, ces angles de dépouille D seront destinés à compenser les éventuels défauts de parallélisme des dents des pignons engrènant l'un l'autre, compte tenu par exemple des jeux obligatoires.In the case of a gearbox, these clearance angles D will be intended to compensate for any defects in the parallelism of the teeth of the pinions meshing with one another, taking account for example of the required clearances.
Lors des opérations successives de matriçage illustrées sur les figures 3, 4, 5 et 6, on met en oeuvre des matrices adaptées à chaque opération et, en particulier, chaque matrice présente des parties mâles adaptées, délimitant les zones inter-dents du pignon et destinées à maintenir le métal constituant ces dents lors des opérations de matriçage successives. En outre, les parties mâles des matrices délimitant les zones inter-dents de la denture de crabotage, sont de largeur réduite d'une opération à l'opération suivante, afin de permettre l'introduction de la pièce dans la matrice considérée.During the successive matrixing operations illustrated in FIGS. 3, 4, 5 and 6, matrices adapted to each operation are used and, in particular, each matrix has adapted male parts, delimiting the inter-tooth areas of the pinion and intended to hold the metal constituting these teeth during successive die-forging operations. In addition, the male parts of the dies delimiting the inter-tooth areas of the interconnection teeth are of reduced width from one operation to the next operation, in order to allow the introduction of the part into the matrix considered.
Egalement, dans l'exemple représenté, le bord d'attaque 3 est situé perpendiculairement à une face latérale de la denture de crabotage. Cependant, toute autre inclinaison pourra être adoptée suivant le genre d'engrenage devant être réalisé, l'arête de ce bord d'attaque pouvant également être parallèle à l'axe de la denture de crabotage.Also, in the example shown, the leading
Il est prévu conformément à l'invention, de réaliser initialement, éventuellement au cours de l'opération de découpage fin, des perçages dans la zone centrale de l'ébauche, ces perçages servant de moyens de centrage pour le positionnement de l'ébauche au cours des opérations ultérieures et successives de matriçage. Lorsque l'ébauche est réalisée, on lui fait alors subir une opération de découpage ayant pour effet de réaliser cette ébauche sous la forme d'une couronne, comme cela est représenté sur la figure 1.It is provided in accordance with the invention to initially carry out, possibly during the fine cutting operation, holes in the central area of the blank, these holes serving as centering means for positioning the blank at during subsequent and successive stamping operations. When the blank is produced, it is then subjected to a cutting operation having the effect of producing this blank in the form of a crown, as shown in FIG. 1.
Claims (3)
- A process for the production of a dog engagement tooth arrangement in the form of a ring with a leading edge forming a sharp-edged angle, comprising forming on the leading edge (3) of each tooth to be produced a first face (10) which is in secant relationship with the axis XX of the tooth, a second face (11) which is in secant relationship with said axis and in opposite relationship to the first face, and forming the sides (14 and 15) of the teeth which define the gaps between the teeth in order to form tapers (D) which are oriented in opposite relationship to the tips (6) of the teeth, characterised in that a blank for the tooth arrangement is produced by cutting out same from a metal plate, that the first and second faces (10 and 11) are formed by successive die shaping operations followed by a simultaneous die shaping operation for the first and second faces (10, 11), forming the leading edges of the teeth, and that the sides (14, 15) of the teeth are also formed by a die shaping operation.
- A process according to claim 1 characterised in that the leading edge (3) is produced on the face of the tooth arrangement which is opposite to the leading face in the cutting operation.
- A process according to either one of the preceding claims characterised in that, prior to the die shaping operations, the tooth arrangement is subjected to a cutting operation, the effect of which is to produce at least one opening in the central zone of the blank, said opening serving as a centering means for positioning of the blank in the course of the successive die shaping operations, and that the tooth arrangement obtained after the die shaping operations is subjected to a cutting operation, the effect of which is to produce said tooth arrangement in the form of a ring.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8608788 | 1986-06-18 | ||
| FR8608788A FR2600274B1 (en) | 1986-06-18 | 1986-06-18 | PROCESS FOR THE PRODUCTION OF SPROCKETS OF WHICH THE EDGE OF ATTACK OF THE TEETH SHAPES A ANGLE WITH A SHARP EDGE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0250312A1 EP0250312A1 (en) | 1987-12-23 |
| EP0250312B1 true EP0250312B1 (en) | 1992-06-03 |
Family
ID=9336447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19870401345 Expired - Lifetime EP0250312B1 (en) | 1986-06-18 | 1987-06-12 | Method of making pinions of which the tooth-driving surfaces form a sharp-edged angle |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0250312B1 (en) |
| JP (1) | JP2554334B2 (en) |
| DE (1) | DE3779495T2 (en) |
| ES (1) | ES2031917T3 (en) |
| FR (1) | FR2600274B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH690565A5 (en) * | 1995-04-10 | 2000-10-31 | Feinstanz Ag | A process for producing gear components with teeth with a roof shape and an undercut. |
| DE10021588B4 (en) * | 2000-05-04 | 2009-04-09 | Schaeffler Kg | Clutch toothing of an element of a synchronizing unit |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3688549A (en) * | 1970-08-14 | 1972-09-05 | Toyota Motor Co Ltd | Process for cold plastic forming of spaced tooth-like projections on a ring or similarly shaped member |
| DE2222080A1 (en) * | 1972-05-05 | 1973-11-22 | Opti Holding Ag | PROCESS AND DIE FOR MANUFACTURING THE GEAR OF SPROCKETS, IN PARTICULAR OF COUPLING BODIES FOR SYNCHRONOUS TRANSMISSIONS |
| DD107219A1 (en) * | 1973-11-01 | 1974-07-20 | ||
| JPS5829510A (en) * | 1981-08-12 | 1983-02-21 | Kobe Steel Ltd | Controlling method for plane shape of thick plate |
| JPS6049826A (en) * | 1983-08-29 | 1985-03-19 | Nissan Motor Co Ltd | Forming method of gear for transmission of automobile |
| FR2557946B1 (en) * | 1984-01-06 | 1989-04-21 | Renault | SYNCHRONIZING SNAP SPROCKET WITH ANTI-SNAP |
| DE3427156C2 (en) * | 1984-07-24 | 1986-07-17 | Bayerisches Leichtmetallwerk Graf Blücher von Wahlstatt GmbH & Co KG, 8000 München | Method for producing a synchronous part with undercut teeth |
-
1986
- 1986-06-18 FR FR8608788A patent/FR2600274B1/en not_active Expired - Lifetime
-
1987
- 1987-06-12 ES ES87401345T patent/ES2031917T3/en not_active Expired - Lifetime
- 1987-06-12 DE DE19873779495 patent/DE3779495T2/en not_active Expired - Fee Related
- 1987-06-12 EP EP19870401345 patent/EP0250312B1/en not_active Expired - Lifetime
- 1987-06-17 JP JP62149303A patent/JP2554334B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6357117A (en) | 1988-03-11 |
| JP2554334B2 (en) | 1996-11-13 |
| DE3779495T2 (en) | 1993-04-29 |
| ES2031917T3 (en) | 1993-01-01 |
| FR2600274B1 (en) | 1990-03-09 |
| FR2600274A1 (en) | 1987-12-24 |
| DE3779495D1 (en) | 1992-07-09 |
| EP0250312A1 (en) | 1987-12-23 |
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