FR2805482A1 - Crown wheel and case for motor vehicle differential has mating splines on inner surface of gar ring and outer surface of casing - Google Patents

Crown wheel and case for motor vehicle differential has mating splines on inner surface of gar ring and outer surface of casing Download PDF

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Publication number
FR2805482A1
FR2805482A1 FR0002389A FR0002389A FR2805482A1 FR 2805482 A1 FR2805482 A1 FR 2805482A1 FR 0002389 A FR0002389 A FR 0002389A FR 0002389 A FR0002389 A FR 0002389A FR 2805482 A1 FR2805482 A1 FR 2805482A1
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France
Prior art keywords
part according
mechanical part
notches
male element
female
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Granted
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FR0002389A
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French (fr)
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FR2805482B1 (en
Inventor
Robert Loscq
Michel Raoul
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Renault SAS
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Renault SAS
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Priority to FR0002389A priority Critical patent/FR2805482B1/en
Publication of FR2805482A1 publication Critical patent/FR2805482A1/en
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Publication of FR2805482B1 publication Critical patent/FR2805482B1/en
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Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/38—Constructional details
    • 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
    • B21K25/00—Uniting components to form integral members, e.g. turbine wheels and shafts, caulks with inserts, with or without shaping of the components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/064—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end non-disconnectable
    • F16D1/072—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end non-disconnectable involving plastic deformation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/38—Constructional details
    • F16H2048/385—Constructional details of the ring or crown gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/06—Differential gearings with gears having orbital motion
    • F16H48/08—Differential gearings with gears having orbital motion comprising bevel gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/0018—Shaft assemblies for gearings
    • F16H57/0025—Shaft assemblies for gearings with gearing elements rigidly connected to a shaft, e.g. securing gears or pulleys by specially adapted splines, keys or methods

Abstract

Crown wheel and case has the case (20) formed of aluminum and a differential crown gear (30) fitting onto a mating surface of the case. The crown gear is a ring with outer gear teeth and an inner bore to fit onto the casing. The gear bearing surface on the casing and the inner surface of the gear have splines extending parallel to the axis of rotation of the gear. The case and gear are pressed together on assembly to cause the splines to mate.

Description

PIECE MECANIQUE <U>DE TRANSMISSION</U> L'invention est relative à l'assemblage de deux éléments mécaniques, telles qu'un boîtier et une couronne de différentiel.  The invention relates to the assembly of two mechanical elements, such as a housing and a differential ring.

Plus précisément, elle concerne une pièce mécanique de transmission constituée d'une part d'un élément mâle ayant une face extérieure de forme générale extérieure cylindrique, et d'autre part d'un élément femelle ayant une face intérieure forme générale cylindrique engagée autour de l'élément male entre les deux extrémités latérales de sa surface extérieure, et présentant des crans s'incrustant dans la matière l'élément mâle lors de l'assemblage. More specifically, it relates to a mechanical transmission part consisting on the one hand of a male element having an outer face of generally cylindrical outer shape, and secondly of a female element having an inner generally cylindrical inner face engaged around the male element between the two lateral ends of its outer surface, and having notches encrusted in the material male element during assembly.

Cette invention trouve une application privilégiée, mais limitative, dans l'assemblage d'une couronne d'un bottier de différentiel.  This invention finds a preferred, but limiting, application in the assembly of a crown of a differential casing.

On connaît diverses façons de fixer une couronne sur un boîtier de différentiel. Parmi celles-ci, la plus utilisée est l'assemblage par vis ou par rivets. There are various ways of attaching a crown to a differential case. Among these, the most used is the assembly by screw or rivets.

La publication FR 2711 199 décrit à ce sujet un procédé d'assemblage particulier sans vis ni rivets, consistant à chauffer la couronne, à la présenter puis à l'engager le boîtier jusqu'à ce qu'elle rencontre un talon prévu sur celui ci, et ' déformer une extrémité du boîtier sur la couronne en refoulant de la matière sur une face latérale de cette dernière. The publication FR 2711 199 describes in this regard a particular method of assembly without screws or rivets, consisting of heating the crown, to present and then to engage the housing until it meets a heel provided on it and deforming one end of the housing on the crown by driving material onto a lateral face thereof.

A cet effet, la couronne du différentiel présente, à l'angle entre le bord inférieur de cette première face latérale et sa surface cylindrique intérieure, un ensemble de crans lui permettant de s'incruster dans l'extrémité correspondante du boîtier. Enfin, contre l'autre face latérale de la couronne, une collerette boîtier est refoulée et vient s'incruster dans une deuxième série de crans réalisés sur la couronne à l'angle entre sa deuxième face latérale et sa surface cylindrique intérieure. For this purpose, the differential ring has, at the angle between the lower edge of this first side face and its inner cylindrical surface, a set of notches allowing it to be embedded in the corresponding end of the housing. Finally, against the other side face of the ring, a housing collar is pushed back and is embedded in a second series of notches made on the ring at the corner between its second side face and its inner cylindrical surface.

Ce procédé d'assemblage proposé pour la liaison mécanique d'une couronne et d'un boîtier de différentiel en aluminium, offre une résistance à la rupture comparable à celle des liaisons classiques par vis et par rivets. This proposed joining method for the mechanical connection of a ring and an aluminum differential case offers a breaking strength comparable to that of conventional screw and rivet connections.

Par contre, il présente l'inconvénient de provoquer une forte contrainte radiale interne dans le boîtier, due au serrage diamétral de la couronne sur ce dernier lors de son refroidissement après assemblage. Cette contrainte interne est augmentée quand la température de l'ensemble boîtier couronne 'élève lors de son utilisation dans une boîte de vitesses. By cons, it has the disadvantage of causing a strong internal radial stress in the housing, due to the diametral clamping of the crown on the latter during its cooling after assembly. This internal stress is increased when the temperature of the crown housing unit rises when it is used in a gearbox.

L'importance de ces contraintes internes conduit alors à une limitation dans la conception du boîtier, notamment dans son allégement, et à une limitation du niveau de couple admissible le boîtier. The importance of these internal constraints then leads to a limitation in the design of the housing, especially in its lightening, and a limitation of the allowable torque level of the housing.

La présente invention vise à réaliser une liaison sertie d'un élément métallique femelle annulaire, telle une couronne de différentiel sur un élément mâle cylindrique , tel un boîtier de différentiel, ne créant pas de contrainte interne radiale après assemblage. The present invention aims to provide a crimped connection of an annular female metal element such as a ring gear on a cylindrical male element, such as a differential housing, not creating a radial internal stress after assembly.

Elle propose à cet effet que les crans s'étendent le long de la face cylindrique intérieure de l'élément femelle. It proposes for this purpose that the notches extend along the inner cylindrical face of the female element.

De préférence, les crans s'incrustent dans surface extérieure cylindrique de l'élément mâle. Ces crans peuvent par exemple être orientes parallèlement à l'axe de révolution de l'élément femelle, s'étendre seulement sur une partie de la surface cylindrique intérieure de cet élément. Preferably, the notches are embedded in the cylindrical outer surface of the male member. These notches may for example be oriented parallel to the axis of revolution of the female element, extend only on a portion of the inner cylindrical surface of this element.

D'autres caractéristiques et avantages de l'invention apparaîtront clairement à la lecture de la description suivante d'un mode de réalisation particulier de celle-ci, en liaison avec les dessins annexés, sur lesquels - figure 1 est une vue en coupe d'un boîtier de différentiel après mise en place de la couronne, - la figure 2 est une vue en perspective de la couronne, - la figure 3 est une vue partielle en coupe du boîtier, avant assemblage, et - la figure 4 est une vue partielle en coupe de la couronne. différentiel 10 représenté sur la figure 1 comprend de façon classique, un boîtier 20 à l'extérieur duquel est fixée une couronne 30. Other features and advantages of the invention will become clear from reading the following description of a particular embodiment thereof, in conjunction with the accompanying drawings, in which - Figure 1 is a sectional view of a differential case after placing the crown, - Figure 2 is a perspective view of the crown, - Figure 3 is a partial sectional view of the housing, before assembly, and - Figure 4 is a partial view. in section of the crown. Differential 10 shown in Figure 1 comprises in a conventional manner a housing 20 outside which is fixed a ring 30.

Sur la figure 2, on voit que la couronne 30 présente sur sa surface cylindrique intérieure 35, des crans 31, dirigés parallèlement à son axe de révolution. Ces crans 31 s'étendent le long de la face cylindrique intérieure 35 de l'élément femelle 30. La figure 2 montre également que les crans 31 sont orientés parallèlement à l'axe de révolution de l'élément femelle 30. In Figure 2, we see that the ring 30 has on its inner cylindrical surface 35, notches 31, directed parallel to its axis of revolution. These notches 31 extend along the inner cylindrical face 35 of the female element 30. FIG. 2 also shows that the notches 31 are oriented parallel to the axis of revolution of the female element 30.

La coupe partielle de la partie extérieure cylindrique du boîtier 20 apparaissant sur la figure 3, présente à extrémité 22 un talon d'appui et de positionnement axial de la couronne, une collerette 23 qui est refoulée vers l'extérieur au cours de l'assemblage de la couronne, et une gorge 24 destinée à recueillir les copeaux de matière arrachés au boîtier la couronne au cours de l'assemblage. The partial section of the cylindrical outer part of the housing 20 appearing in FIG. 3, has at the end 22 a bearing and axial positioning of the crown, a flange 23 which is forced outwards during assembly. of the crown, and a groove 24 for collecting the chips of material torn from the housing crown during assembly.

coupe partielle de la couronne 30, reproduite la figure montre un cran 31 ayant à une des ses extrémités un premier chanfrein 32 destiné à faciliter son incrustation dans la matière de la partie extérieure 21 du boîtier, et à son extrémité opposée un second chanfrein 33, sur lequel est refoulée la collerette 23 du boîtier. Cette figure montre également que le cran 31 s'étend seulement sur une partie de la surface cylindrique intérieure 35 de l'élément femelle 30. partial section of the ring 30, reproduced in the figure shows a notch 31 having at one of its ends a first chamfer 32 intended to facilitate its embedding in the material of the outer portion 21 of the housing, and at its opposite end a second chamfer 33, on which is pushed back the collar 23 of the housing. This figure also shows that the catch 31 extends only over part of the inner cylindrical surface 35 of the female element 30.

effet, l'invention propose que les crans ne s'étendent pas toute la largeur de la couronne, mais que la surface intérieure 35 comprenne un premier secteur cylindrique 34a non cranté assurant le précentrage de la couronne sur le boîtier lors de l'assemblage, et un second secteur cranté 34b. indeed, the invention proposes that the notches do not extend the entire width of the crown, but that the inner surface 35 comprises a first cylindrical sector 34a not serrated ensuring the pre-centering of the crown on the housing during assembly, and a second notched sector 34b.

En conclusion, l'invention permet d'assembler deux éléments cylindriques concentriques en une pièce mécanique rigide, capable de transmettre des couples très élevés. En particulier, l'incrustation de l'élément femelle dans l'élément mâle sur une partie importante de leur zone de contact, limite la mise en contrainte radiale des deux éléments au refroidissement. Par ailleurs, le centrage de l'élément femelle sur l'élément mâle est facilité par la zone d'engagement non crantée prévue à l'intérieur de l'élément femelle. Comme indiqué plus haut, l'invention trouve donc une application privilégiée mais non exclusive dans la fixation d'une couronne sur un boîtier de différentiel.In conclusion, the invention makes it possible to assemble two concentric cylindrical elements into a rigid mechanical part capable of transmitting very high torques. In particular, the incrustation of the female element in the male element over a large part of their contact zone, limits the placing in radial stress of the two elements cooling. Furthermore, the centering of the female element on the male element is facilitated by the non-notched engagement zone provided inside the female element. As indicated above, the invention therefore has a preferred but not exclusive application in fixing a ring gear on a differential housing.

Claims (1)

<U>REVENDICATIONS</U> [1] Pièce mécanique de transmission constituée d'une part élément mâle (20) ayant une face extérieure de forme génerale extérieure cylindrique (21), et d'autre part d'un élément femelle (30) ayant une face intérieure (35) forme générale cylindrique engagée autour de l'élément mâle (21) entre les deux extrémités latérales (22, 23) de surface extérieure (21) et présentant des crans (31) s'incrustant dans la matière de l'élément mâle (20) lors de l'assemblage, caractérisée en ce que les crans (31) s'étendent le long de la face cylindrique intérieure (35) de l'élément femelle (30). [2] Pièce mécanique selon la revendication 1, caractérisée en ce que les crans (31) s'incrustent dans surface extérieure cylindrique (21) de l'élément mâle (20). [3] Pièce mécanique selon la revendication 1 ou 2, caractérisée en ce que les crans (31) sont orientés parallèlement à l'axe de révolution de l'élément femelle (30). [4] Pièce mécanique selon la revendication 1, 2 ou 3, caractérisée en ce que les crans (31) s'étendent seulement sur une partie de la surface cylindrique intérieure (35) de l'élément femelle (30). [5] Pièce mécanique selon l'une des revendications précédentes, caractérisé en ce que la surface intérieure (35) comprend un premier secteur cylindrique (34a) assurant le précentrage de l'élément femelle (30 sur l'élément mâle (20) lors de l'assemblage, et un second secteur cranté (34b). [6] Pièce mécanique selon l'une des revendications précédentes, caractérisée en ce que les crans (31) présentent à l'une de leurs extrémités un premier chanfrein (32) destiné à faciliter leur incrustation dans la matière de l'élément mâle (20). Pièce mécanique selon l'une des revendications précédentes, caractérisée en ce que l'élément mâle (20) présente une gorge (24) destinée à recueillir les copeaux de matière arrachés à celui-ci par l'élément femelle (30) lors de l'assemblage. Pièce mécanique selon l'une des revendications précédentes, caractérisée en ce que la surface cylindrique extérieure (21) de l'élément mâle (20) présente ' l'une de ses extrémités (22) un talon d'appui et de positionnement axial de l'élément femelle (30). [ J Pièce mécanique selon l'une des revendications précédentes, caractérisé en ce que la surface extérieure cylindrique (21) de l'élément mâle (20) présente a l'une de ses extrémités (23) une collerette refoulée après l'assemblage contre un second chanfrein de raccordement (33) de l'élément femelle (20). [10] Pièce mécanique selon l'une des revendications précédentes, caractérisée ce que l'élément mâle (20) est un boîtier de différentiel, et "en ce que l'élément femelle (30) est une couronne de différentiel.<U> CLAIMS </ U> [1] Mechanical transmission part consisting on the one hand of a male element (20) having an outside face of cylindrical outer general shape (21), and on the other hand of a female element (30). ) having an inner generally cylindrical face (35) engaged around the male element (21) between the two lateral ends (22, 23) of the outer surface (21) and having notches (31) which are encrusted in the material of the male element (20) during assembly, characterized in that the notches (31) extend along the inner cylindrical face (35) of the female element (30). [2] Mechanical part according to claim 1, characterized in that the notches (31) are incrusted in cylindrical outer surface (21) of the male element (20). [3] Mechanical part according to claim 1 or 2, characterized in that the notches (31) are oriented parallel to the axis of revolution of the female member (30). [4] Mechanical part according to claim 1, 2 or 3, characterized in that the notches (31) extend only over a portion of the inner cylindrical surface (35) of the female member (30). [5] Mechanical part according to one of the preceding claims, characterized in that the inner surface (35) comprises a first cylindrical sector (34a) ensuring the pre-centering of the female element (30 on the male element (20) when assembly, and a second notched sector (34b) [6] Mechanical part according to one of the preceding claims, characterized in that the notches (31) have at one of their ends a first chamfer (32). for facilitating their incrustation in the material of the male element (20) Mechanical part according to one of the preceding claims, characterized in that the male element (20) has a groove (24) intended to collect the chips of material removed from it by the female element (30) during assembly Mechanical part according to one of the preceding claims, characterized in that the outer cylindrical surface (21) of the male element (20) is at one of its ends (22) there is a support and axial positioning heel of the female element (30). Mechanical part according to one of the preceding claims, characterized in that the cylindrical outer surface (21) of the male element (20) has at one of its ends (23) a collapsed flange after assembly against a second connecting chamfer (33) of the female element (20). [10] Mechanical part according to one of the preceding claims, characterized in that the male element (20) is a differential housing, and "in that the female element (30) is a differential ring.
FR0002389A 2000-02-25 2000-02-25 MECHANICAL TRANSMISSION PART Expired - Fee Related FR2805482B1 (en)

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Application Number Priority Date Filing Date Title
FR0002389A FR2805482B1 (en) 2000-02-25 2000-02-25 MECHANICAL TRANSMISSION PART

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FR0002389A FR2805482B1 (en) 2000-02-25 2000-02-25 MECHANICAL TRANSMISSION PART

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FR2805482A1 true FR2805482A1 (en) 2001-08-31
FR2805482B1 FR2805482B1 (en) 2002-05-03

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011004252A1 (en) * 2009-07-07 2011-01-13 Agco Gmbh Securing methods
EP2728222A1 (en) * 2011-06-29 2014-05-07 Toyota Jidosha Kabushiki Kaisha Press-fit structure and press-fit method
CN110905989A (en) * 2019-10-09 2020-03-24 重庆神箭汽车传动件有限责任公司 Differential housing and gear assembly
CN111022607A (en) * 2019-10-09 2020-04-17 重庆神箭汽车传动件有限责任公司 Differential gear connecting structure
WO2020104165A1 (en) * 2018-11-22 2020-05-28 Audi Ag Differential gear for a motor vehicle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2118273A (en) * 1982-04-15 1983-10-26 Automotive Products Plc Hub assembly for a clutch driven plate
FR2580341A1 (en) * 1985-04-16 1986-10-17 Paris & Du Rhone Method for producing a rigid connection between two coaxial mechanical components, and set of two components connected by this method
EP0647789A1 (en) * 1993-10-12 1995-04-12 Société Anonyme dite: REGIE NATIONALE DES USINES RENAULT Differential casing
DE19710847A1 (en) * 1997-03-15 1998-09-24 Selzer Fertigungstech Multipart serial produced camshaft for especially internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2118273A (en) * 1982-04-15 1983-10-26 Automotive Products Plc Hub assembly for a clutch driven plate
FR2580341A1 (en) * 1985-04-16 1986-10-17 Paris & Du Rhone Method for producing a rigid connection between two coaxial mechanical components, and set of two components connected by this method
EP0647789A1 (en) * 1993-10-12 1995-04-12 Société Anonyme dite: REGIE NATIONALE DES USINES RENAULT Differential casing
DE19710847A1 (en) * 1997-03-15 1998-09-24 Selzer Fertigungstech Multipart serial produced camshaft for especially internal combustion engine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011004252A1 (en) * 2009-07-07 2011-01-13 Agco Gmbh Securing methods
EP2728222A1 (en) * 2011-06-29 2014-05-07 Toyota Jidosha Kabushiki Kaisha Press-fit structure and press-fit method
EP2728222A4 (en) * 2011-06-29 2015-04-22 Toyota Motor Co Ltd Press-fit structure and press-fit method
US9546725B2 (en) 2011-06-29 2017-01-17 Toyota Jidosha Kabushiki Kaisha Press-fit structure and press-fit method
WO2020104165A1 (en) * 2018-11-22 2020-05-28 Audi Ag Differential gear for a motor vehicle
CN113167366A (en) * 2018-11-22 2021-07-23 奥迪股份公司 Differential gear for a motor vehicle
US11353100B2 (en) 2018-11-22 2022-06-07 Audi Ag Differential gear for a motor vehicle
CN110905989A (en) * 2019-10-09 2020-03-24 重庆神箭汽车传动件有限责任公司 Differential housing and gear assembly
CN111022607A (en) * 2019-10-09 2020-04-17 重庆神箭汽车传动件有限责任公司 Differential gear connecting structure

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Effective date: 20131031