WO2019073134A1 - Motor vehicle transmission system comprising bushings for holding attachment screws - Google Patents

Motor vehicle transmission system comprising bushings for holding attachment screws Download PDF

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Publication number
WO2019073134A1
WO2019073134A1 PCT/FR2018/052227 FR2018052227W WO2019073134A1 WO 2019073134 A1 WO2019073134 A1 WO 2019073134A1 FR 2018052227 W FR2018052227 W FR 2018052227W WO 2019073134 A1 WO2019073134 A1 WO 2019073134A1
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WO
WIPO (PCT)
Prior art keywords
transmission system
transmission
screw
housing
bore
Prior art date
Application number
PCT/FR2018/052227
Other languages
French (fr)
Inventor
Olivier DOINET
Original Assignee
Psa Automobiles Sa
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 Psa Automobiles Sa filed Critical Psa Automobiles Sa
Publication of WO2019073134A1 publication Critical patent/WO2019073134A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D65/00—Designing, manufacturing, e.g. assembling, facilitating disassembly, or structurally modifying motor vehicles or trailers, not otherwise provided for
    • B62D65/02—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components
    • B62D65/10—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components the sub-units or components being engines, clutches or transmissions

Definitions

  • the present invention relates to a motor vehicle transmission system comprising a transmission housing equipped with a fixing screw of this housing, and a method of assembling this transmission system.
  • the housings of transmissions of motor vehicles generally comprise a support plane coming on the engine, having on its contour bosses each comprising a bore receiving a tight fastening screw in a tapped hole of the engine.
  • a workshop is prepared for preparing the powertrain of the vehicle, an approach to the transmission on the heat engine, then a commitment of the screws towards a forward direction in the bores of this transmission, and a screwing of each screw on the motor by an automatic screwdriver providing the necessary tightening torque.
  • certain transmissions have complementary functions making it possible to hybridize the vehicle, which add a bulk to the transmission. It is possible to have in particular in the transmission an electric traction motor and a control inverter of this electric machine, which make it possible to carry out an electric mode operation without emission of polluting gases.
  • One type of known device for holding a fixing screw in a housing bore comprises an axial portion enclosing the screw rod, comprising a planar front face surrounding the piercing , and a lug in front of this flat face, having a recess receiving a lug of the housing for the attachment of this device.
  • the axial portion has an axial slot, so as to grip the screw on a little more than 180 °.
  • the rear face of this axial portion receiving the support of the screw head has an inclined slope. A tightening of the screw causes a sliding of the head on this rear slope, which progressively radially spreads the device for holding the screw by an elastic deformation of its axial portion, opening its slot to let out the screw rod.
  • this holding device provided for detaching during tightening of the screw, can not be removed easily by hand before tightening, which is not compatible with certain methods of assembling a transmission on a combustion engine. motor vehicle.
  • the present invention is intended in particular to avoid these problems of the prior art.
  • a motor vehicle transmission system comprising a transmission housing having a through bore, a crankcase fixing screw on a heat engine engaged in this drilling in a forward direction, and a maintenance device this fixing screw in the bore, this system being remarkable in that the holding device has a hooking shape on the housing, and comprises a sleeve receiving the screw rod, having a lateral side a rear opening allowing a passage of this rod laterally in the sleeve, and the opposite side a full opening over the entire length allowing removal of the device leaving the rod in the bore.
  • An advantage of this transmission system is that the transmission can be prepared by fixing the holding device by its hooking shape, then laterally insert the screw into the sleeve aligned with the housing bore through the rear opening passing through its rod, and finally advance this screw into the piercing. It is then easy to remove the retaining device before the tightening by the total opening allowing the screw having its rod engaged in the bore and its head behind the socket.
  • the transmission system according to the invention may further comprise one or more of the following features, which may be combined with each other.
  • the holding device may comprise two bushings arranged at the ends of a cross member, having parallel axes.
  • the hooking shape on the housing comprises a stud fitting into a hole of the housing.
  • the stud has axial tabs which are radially elastic.
  • each bushing comprises an internal clamping bead ensuring a maintenance of the screw rod engaged in it.
  • the transmission housing may comprise an overhanging shape disposed behind the screw.
  • the screw head being supported on the rear face of the bushing, the front end of the screw rod is disposed behind a front support face of the housing on the engine.
  • the transmission may include an electric traction machine.
  • the holding device is formed by a molding of a plastic material.
  • the invention also relates to a method of assembling a heat engine of a transmission system comprising any one of the preceding features, remarkable in that it comprises a step of preparing the transmission comprising the implementation of the holding device and the insertion of fixing screws in this holding device, then a step of positioning the transmission on the heat engine, then a step of removing the device from the maintenance, and finally a step of tightening the screws of fastening with an automatic screwdriver.
  • FIG. 1 shows a holding device for a screw of a transmission system according to the invention
  • FIG. 2 and 3 show respectively in rear view and in outer side view a sleeve of the holding device
  • FIG. 4 shows a first step of implementation of the holding device, comprising the fixing of this device
  • FIG. 9 shows a next step of screwing the screws to the automatic screwdriver.
  • FIGS. 1, 2 and 3 show a device for holding a particular fastening screw 20 engaged in a drilling of a transmission, comprising a flat cross member 2 comprising in the center a stud 4 constituting a form of attachment, turned towards a side called inner side, indicated by the arrow INT, formed of four axial tabs which are radially slightly elastic.
  • a grip button 6 is fixed on the crosspiece 2, opposite the stud 4 on the outside.
  • a forward / backward direction is defined perpendicular to the inner / outer direction, in a transverse plane of the crossbar 2.
  • the front side is indicated by the arrow AV.
  • the width of the flat cross member 2 is arranged in this forward / backward direction.
  • Two bushes 8 each fixed at one end of the cross member 2 have parallel axes arranged in the forward / backward direction, to maintain along their axis a fastening screw 20 of the transmission on a heat engine, having its rod 22 facing the 'before.
  • Each bushing 8 has on the outside a rear lateral opening 10 having an elongated rectangular contour along the axis of the bushing, which extends over about two-thirds of the length of this bushing.
  • the width of the rear opening 10 is slightly greater than the diameter of the screw 22.
  • Each bushing 8 has on the inner side a total lateral opening along the length 12, including a drop equal to that of the bushing.
  • Each bushing 8 has inside its front end a clamping bead 14 formed of three angular sectors, having an internal contour designed to tighten the screw rod 22, as shown in FIG. 3.
  • the internal clamping bead 14 and the total opening 12 allow laterally escape the screw rod 22 which slides outside the sleeve 8 to the inner side.
  • the holding device is advantageously formed by a molding of a plastic material, which economically produces in a single molding complex shapes having a certain elasticity, in particular making it possible to tighten the bead 14 on the screw rod 22.
  • FIG. 4 shows a first step for assembling a transmission on a heat engine, comprising a transmission casing having on the contour of the bearing face on the engine two bosses 32 each having a through-hole 36 intended to receive a fixing screw 20.
  • the transmission casing has an overhanging shape 34 coming behind the two screws 20, which limits the space behind these screws, forcing to use shorter ones than the other fixing screws on the heat engine, to engage on their head. 24 an automatic screwdriver.
  • an operator positions the holding device by engaging the stud 4 in a rough foundry hole 30 formed on the outer side of the transmission housing.
  • the operator presses the button 6, the stud 4 being held tight thanks to the elastic deformation of its axial tabs, which make it possible to adapt to the inaccurate shape of the hole 30 formed directly by the foundry.
  • Each bushing 8 is aligned with a bore 36 of the housing.
  • FIG. 5 shows the engagement in each bushing 8 of a fastening screw 20, by passing its rod 22 into the rear lateral opening 10.
  • the length of this rear opening 10 is designed so that the screw head 24 passes through. before the overhanging form 34 of the housing.
  • FIG. 6 shows the advance of each screw 20 in the bore 36 disposed in the axis of the bushing 8, by the operator pressing on the screw head 24.
  • the total length of the bushing 8 is provided so that the screw head 24 coming on the rear face of this sleeve, the front end of the screw stops slightly back from the front support face 38 of the housing.
  • the rod of each screw 22 is held tight by the inner bead 14 of the bushing 8, which allows in particular to prepare the transmission with its specific screws 20 put in position, and to send it to the car manufacturer for assembly on the engine.
  • the screws 20 do not protrude from the front support face 38 of the housing, facilitates the docking of the transmission on the engine which is not hindered by screw rods 22 protruding from the housing.
  • FIG. 7 shows after the positioning of the transmission on the engine, removing the holding device by pulling on the button 6 to extract the stud 4 of the hole 30 of the transmission housing.
  • Each bushing 8 easily leaves thanks to the total lateral opening 12 of the inner side of this bushing which allows the screw rod 22 to pass.
  • FIG. 8 shows the operator then starting the tightening of each screw 20 by hand, in order to engage the first threads of the front end of the screw in the corresponding threaded hole of the heat engine 40.
  • the operator can engage the other standard screws for fixing the transmission on the engine 40, which can be the screws commonly used to fix the different types of transmission at the same assembly station.
  • FIG. 9 shows an automatic screwdriver 50 comprising a tip engaged by the operator on the head 24 of the particular screws 20, which passes easily between this screw head and the overhanging shape of the casing 34 thanks to the length of these screws which is short enough.
  • the automatic screwdriver 50 makes it possible in particular to control the tightening parameters of the particular screws 20 such as those of the other screws, which gives a uniformity of quality of the tightenings.
  • the transmission system according to the invention makes it possible to guarantee the presence of the particular screws 20 in the right bores, and to avoid any inversion with other screws which would waste time.

Abstract

A motor vehicle transmission system, comprising a transmission casing provided with a through-hole (36), an attachment screw (20) for attaching the casing to a heat engine engaged in this hole (36) in a forward direction, and a device for holding this attachment screw (20) in the hole (36), this system being characterised in that the holding device comprises a shape that fastens to the casing, and comprises a bushing (8) receiving the screw shaft (22), having, on one lateral side, a rear opening (10) allowing this shaft (22) to pass laterally through the bushing (8) and, on the opposite side, a total opening along the entire length, allowing the device to be removed, leaving the shaft (22) in the hole (36).

Description

SYSTEME DE TRANSMISSION DE VEHICULE AUTOMOBILE COMPORTANT DES DOUILLES DE MAINTIEN DE VIS DE FIXATION  AUTOMOTIVE VEHICLE TRANSMISSION SYSTEM COMPRISING SLEEVES FOR HOLDING SCREWS
La présente invention concerne un système de transmission de véhicule automobile comportant un carter de transmission équipé d'une vis de fixation de ce carter, ainsi qu'un procédé d'assemblage de ce système de transmission. The present invention relates to a motor vehicle transmission system comprising a transmission housing equipped with a fixing screw of this housing, and a method of assembling this transmission system.
Les carters des transmissions des véhicules automobiles comportent généralement un plan d'appui venant sur le moteur thermique, présentant sur son contour des bossages comprenant chacun un perçage recevant une vis de fixation serrée dans un perçage taraudé de ce moteur thermique.  The housings of transmissions of motor vehicles generally comprise a support plane coming on the engine, having on its contour bosses each comprising a bore receiving a tight fastening screw in a tapped hole of the engine.
On réalise à un poste d'assemblage d'un atelier de préparation du groupe motopropulseur du véhicule, une approche de la transmission sur le moteur thermique, puis un engagement des vis vers une direction avant dans les perçages de cette transmission, et un vissage de chaque vis sur le moteur par une visseuse automatique assurant le couple de serrage nécessaire.  At an assembly station, a workshop is prepared for preparing the powertrain of the vehicle, an approach to the transmission on the heat engine, then a commitment of the screws towards a forward direction in the bores of this transmission, and a screwing of each screw on the motor by an automatic screwdriver providing the necessary tightening torque.
Afin d'éviter une complexité d'approvisionnement des vis et des risques d'erreur de manipulation, il est connu de disposer un ensemble de vis identiques pour fixer la transmission sur le moteur thermique, ce qui permet d'insérer dans tous les perçages de cette transmission les mêmes vis prises en vrac dans un contenant.  In order to avoid a complexity of supply of the screws and the risks of error handling, it is known to have a set of identical screws to fix the transmission on the heat engine, which allows to insert into all the holes of this transmission the same screws taken loose in a container.
Par ailleurs certaines transmissions comportent des fonctions complémentaires permettant de réaliser une hybridation du véhicule, qui ajoutent un encombrement sur la transmission. On peut disposer notamment dans la transmission un moteur électrique de traction et un onduleur de commande de cette machine électrique, qui permettent de réaliser un roulage en mode électrique sans émission de gaz polluants.  In addition, certain transmissions have complementary functions making it possible to hybridize the vehicle, which add a bulk to the transmission. It is possible to have in particular in the transmission an electric traction motor and a control inverter of this electric machine, which make it possible to carry out an electric mode operation without emission of polluting gases.
Toutefois pour des raisons d'encombrement, certaines vis de fixation doivent être différentes pour permettre une insertion et un vissage avec la visseuse automatique. On peut dans ce cas préparer ces vis différentes en les insérant au préalable dans les perçages de la transmission, pour ne pas les mélanger avec les autres. Il faut alors maintenir ces vis avant leur vissageHowever for reasons of space, some fixing screws must be different to allow insertion and screwing with the automatic screwdriver. We can in this case prepare these different screws in them inserting previously in the holes of the transmission, not to mix them with others. It is then necessary to maintain these screws before their screwing
Un type de dispositif connu de maintien d'une vis de fixation dans un perçage d'un carter, présenté notamment par le document US-B2-7946781 , comporte une partie axiale enserrant la tige de vis, comprenant une face plane avant entourant le perçage, et une patte en avant de cette face plane, présentant un creux recevant un ergot du carter pour l'accrochage de ce dispositif. One type of known device for holding a fixing screw in a housing bore, presented in particular in the document US-B2-7946781, comprises an axial portion enclosing the screw rod, comprising a planar front face surrounding the piercing , and a lug in front of this flat face, having a recess receiving a lug of the housing for the attachment of this device.
La partie axiale comporte une fente axiale, de manière à enserrer la vis sur un peu plus de 180° . La face arrière de cette partie axiale recevant l'appui de la tête de vis, présente une pente inclinée. Un serrage de la vis entraîne un glissement de la tête sur cette pente arrière, qui progressivement écarte radialement le dispositif de maintien de la vis par une déformation élastique de sa partie axiale, en ouvrant sa fente pour laisser sortir la tige de vis.  The axial portion has an axial slot, so as to grip the screw on a little more than 180 °. The rear face of this axial portion receiving the support of the screw head has an inclined slope. A tightening of the screw causes a sliding of the head on this rear slope, which progressively radially spreads the device for holding the screw by an elastic deformation of its axial portion, opening its slot to let out the screw rod.
Arrivé à un certain niveau d'avance de la vis le dispositif de maintien est complètement écarté de cette vis, et il se détache automatiquement.  Arrived at a certain level of advance of the screw the holding device is completely removed from this screw, and it comes off automatically.
Toutefois ce dispositif de maintien prévu pour se détacher lors du serrage de la vis, ne peut pas être retiré facilement à la main avant ce serrage ce qui n'est pas compatible avec certains procédés d'assemblage d'une transmission sur un moteur thermique de véhicule automobile.  However, this holding device provided for detaching during tightening of the screw, can not be removed easily by hand before tightening, which is not compatible with certain methods of assembling a transmission on a combustion engine. motor vehicle.
La présente invention a notamment pour but d'éviter ces problèmes de l'art antérieur.  The present invention is intended in particular to avoid these problems of the prior art.
Elle propose à cet effet un système de transmission de véhicule automobile, comportant un carter de transmission disposant d'un perçage traversant, une vis de fixation du carter sur un moteur thermique engagée dans ce perçage suivant une direction avant, et un dispositif de maintien de cette vis de fixation dans le perçage, ce système étant remarquable en ce que le dispositif de maintien comporte une forme d'accrochage sur le carter, et comporte une douille recevant la tige de vis, présentant d'un côté latéral une ouverture arrière permettant un passage de cette tige latéralement dans la douille, et du côté opposé une ouverture totale sur toute la longueur permettant un retrait du dispositif en laissant la tige dans le perçage. It proposes for this purpose a motor vehicle transmission system, comprising a transmission housing having a through bore, a crankcase fixing screw on a heat engine engaged in this drilling in a forward direction, and a maintenance device this fixing screw in the bore, this system being remarkable in that the holding device has a hooking shape on the housing, and comprises a sleeve receiving the screw rod, having a lateral side a rear opening allowing a passage of this rod laterally in the sleeve, and the opposite side a full opening over the entire length allowing removal of the device leaving the rod in the bore.
Un avantage de ce système de transmission est qu'on peut préparer la transmission en fixant le dispositif de maintien par sa forme d'accrochage, puis insérer latéralement la vis dans la douille alignée sur le perçage du carter grâce à l'ouverture arrière laissant passer sa tige, et enfin avancer cette vis dans le perçage. On peut ensuite facilement avant le vissage retirer le dispositif de maintien grâce à l'ouverture totale laissant passer la vis présentant sa tige engagée dans le perçage et sa tête en arrière de la douille.  An advantage of this transmission system is that the transmission can be prepared by fixing the holding device by its hooking shape, then laterally insert the screw into the sleeve aligned with the housing bore through the rear opening passing through its rod, and finally advance this screw into the piercing. It is then easy to remove the retaining device before the tightening by the total opening allowing the screw having its rod engaged in the bore and its head behind the socket.
De cette manière une vis particulière différente des autres, peut être maintenue dans une position axiale adaptée permettant de ne pas dépasser du plan d'appui du carter sur le moteur thermique disposé en avant du perçage. Toutes les vis sont serrées avec une même visseuse, la vis particulière pouvant être plus courte, avec un bossage du carter de la transmission disposé en arrière de cette vis limitant l'espace pour le passage de cette visseuse.  In this way a particular screw different from the others, can be maintained in an axial position adapted to not exceed the bearing plane of the housing on the heat engine disposed in front of the bore. All screws are tightened with the same screwdriver, the particular screw can be shorter, with a boss of the transmission housing disposed behind this screw limiting the space for the passage of this screwdriver.
Le système de transmission selon l'invention peut de plus comporter une ou plusieurs des caractéristiques suivantes, qui peuvent être combinées entre elles.  The transmission system according to the invention may further comprise one or more of the following features, which may be combined with each other.
En particulier, le dispositif de maintien peut comporter deux douilles disposées aux extrémités d'une traverse, présentant des axes parallèles.  In particular, the holding device may comprise two bushings arranged at the ends of a cross member, having parallel axes.
Avantageusement, la forme d'accrochage sur le carter comporte un plot s'ajustant dans un trou du carter.  Advantageously, the hooking shape on the housing comprises a stud fitting into a hole of the housing.
Dans ce cas, avantageusement le plot comporte des pattes axiales qui sont radialement élastiques.  In this case, advantageously the stud has axial tabs which are radially elastic.
Avantageusement, chaque douille comporte un bourrelet intérieur de serrage assurant un maintien de la tige de vis engagée dedans.  Advantageously, each bushing comprises an internal clamping bead ensuring a maintenance of the screw rod engaged in it.
En particulier, le carter de transmission peut comporter une forme en surplomb disposée en arrière de la vis. Avantageusement, la tête de vis étant en appui sur la face arrière de la douille, l'extrémité avant de la tige de vis est disposée en arrière d'une face d'appui avant du carter sur le moteur thermique. In particular, the transmission housing may comprise an overhanging shape disposed behind the screw. Advantageously, the screw head being supported on the rear face of the bushing, the front end of the screw rod is disposed behind a front support face of the housing on the engine.
En particulier, la transmission peut comporter une machine électrique de traction.  In particular, the transmission may include an electric traction machine.
Avantageusement, le dispositif de maintien est formé par un moulage d'une matière plastique.  Advantageously, the holding device is formed by a molding of a plastic material.
L'invention a aussi pour objet un procédé d'assemblage sur un moteur thermique d'un système de transmission comprenant l'une quelconque des caractéristiques précédentes, remarquable en ce qu'il comporte une étape de préparation de la transmission comprenant la mise en place du dispositif de maintien et l'insertion de vis de fixation dans ce dispositif de maintien, puis une étape de positionnement de la transmission sur le moteur thermique, ensuite une étape de retrait du dispositif du maintien, et enfin une étape de serrage des vis de fixation avec une visseuse automatique.  The invention also relates to a method of assembling a heat engine of a transmission system comprising any one of the preceding features, remarkable in that it comprises a step of preparing the transmission comprising the implementation of the holding device and the insertion of fixing screws in this holding device, then a step of positioning the transmission on the heat engine, then a step of removing the device from the maintenance, and finally a step of tightening the screws of fastening with an automatic screwdriver.
L'invention sera mieux comprise et d'autres caractéristiques et avantages apparaîtront plus clairement à la lecture de la description ci-après donnée à titre d'exemple et de manière non limitative, en référence aux dessins annexés dans lesquels :  The invention will be better understood and other features and advantages will appear more clearly on reading the following description given by way of example and in a nonlimiting manner, with reference to the appended drawings in which:
- la figure 1 présente un dispositif de maintien pour une vis d'un système de transmission selon l'invention ;  - Figure 1 shows a holding device for a screw of a transmission system according to the invention;
- les figures 2 et 3 présentent respectivement en vue arrière et en vue de côté extérieur une douille de ce dispositif de maintien ;  - Figures 2 and 3 show respectively in rear view and in outer side view a sleeve of the holding device;
- la figure 4 présente une première étape de mise en œuvre du dispositif de maintien, comprenant la fixation de ce dispositif ;  - Figure 4 shows a first step of implementation of the holding device, comprising the fixing of this device;
- la figure 5 présente une étape suivante d'introduction de deux vis dans ce dispositif ;  - Figure 5 shows a next step of introducing two screws into this device;
- la figure 6 présente une étape suivante d'avance des deux vis ;  - Figure 6 shows a next step in advance of the two screws;
- la figure 7 présente une étape suivante de retrait du dispositif de maintien ; - la figure 8 présente une étape suivante de début du vissage manuel des vis après le positionnement de la transmission sur le moteur thermique ; et- Figure 7 shows a subsequent step of removing the holding device; - Figure 8 shows a next step of starting manual screwing screws after the positioning of the transmission on the engine; and
- la figure 9 présente une étape suivante de vissage des vis à la visseuse automatique. - Figure 9 shows a next step of screwing the screws to the automatic screwdriver.
Les figures 1 , 2 et 3 présentent un dispositif de maintien d'une vis particulière de fixation 20 engagée dans un perçage d'une transmission, comportant une traverse plate 2 comprenant au centre un plot 4 constituant une forme d'accrochage, tourné vers un côté appelé côté intérieur, indiqué par la flèche INT, formé de quatre pattes axiales qui sont radialement légèrement élastiques. Un bouton de préhension 6 est fixé sur la traverse 2, en face du plot 4 sur le côté extérieur.  FIGS. 1, 2 and 3 show a device for holding a particular fastening screw 20 engaged in a drilling of a transmission, comprising a flat cross member 2 comprising in the center a stud 4 constituting a form of attachment, turned towards a side called inner side, indicated by the arrow INT, formed of four axial tabs which are radially slightly elastic. A grip button 6 is fixed on the crosspiece 2, opposite the stud 4 on the outside.
Une direction avant/arrière est définie perpendiculairement à la direction intérieure/extérieure, dans un plan transversal de la traverse 2. Le côté avant est indiqué par la flèche AV. La largeur de la traverse plate 2 est disposée suivant cette direction avant/arrière.  A forward / backward direction is defined perpendicular to the inner / outer direction, in a transverse plane of the crossbar 2. The front side is indicated by the arrow AV. The width of the flat cross member 2 is arranged in this forward / backward direction.
Deux douilles 8 fixées chacune à une extrémité de la traverse 2, présentent des axes parallèles disposés suivant la direction avant/arrière, pour maintenir suivant leur axe une vis de fixation 20 de la transmission sur un moteur thermique, présentant sa tige 22 tournée vers l'avant.  Two bushes 8 each fixed at one end of the cross member 2, have parallel axes arranged in the forward / backward direction, to maintain along their axis a fastening screw 20 of the transmission on a heat engine, having its rod 22 facing the 'before.
Chaque douille 8 comporte du côté extérieur une ouverture latérale arrière 10 présentant un contour rectangulaire allongé suivant l'axe de la douille, qui s'étend sur environ les deux tiers de la longueur de cette douille. La largeur de l'ouverture arrière 10 est légèrement supérieure au diamètre de la vis 22.  Each bushing 8 has on the outside a rear lateral opening 10 having an elongated rectangular contour along the axis of the bushing, which extends over about two-thirds of the length of this bushing. The width of the rear opening 10 is slightly greater than the diameter of the screw 22.
Chaque douille 8 comporte du côté intérieur une ouverture latérale totale sur la longueur 12, comprenant une larguer égale à celle de la douille.  Each bushing 8 has on the inner side a total lateral opening along the length 12, including a drop equal to that of the bushing.
Chaque douille 8 comporte à l'intérieur de son extrémité avant un bourrelet de serrage 14 formé de trois secteurs angulaires, présentant un contour intérieur prévu pour serrer la tige de vis 22, comme présenté figure 3. Le bourrelet intérieur de serrage 14 ainsi que l'ouverture totale 12 permettent de laisser s'échapper latéralement la tige de vis 22 qui coulisse en dehors de la douille 8 vers le côté intérieur. Each bushing 8 has inside its front end a clamping bead 14 formed of three angular sectors, having an internal contour designed to tighten the screw rod 22, as shown in FIG. 3. The internal clamping bead 14 and the total opening 12 allow laterally escape the screw rod 22 which slides outside the sleeve 8 to the inner side.
Le dispositif de maintien est avantageusement formé par un moulage d'une matière plastique, qui produit de manière économique en un seul moulage des formes complexes présentant une certaine élasticité, permettant notamment de réaliser le serrage du bourrelet 14 sur la tige de vis 22.  The holding device is advantageously formed by a molding of a plastic material, which economically produces in a single molding complex shapes having a certain elasticity, in particular making it possible to tighten the bead 14 on the screw rod 22.
La figure 4 présente une première étape pour l'assemblage d'une transmission sur un moteur thermique, comprenant un carter de transmission présentant sur le contour de la face d'appui sur le moteur deux bossages 32 comportant chacun un perçage 36 traversant prévu pour recevoir une vis de fixation 20.  FIG. 4 shows a first step for assembling a transmission on a heat engine, comprising a transmission casing having on the contour of the bearing face on the engine two bosses 32 each having a through-hole 36 intended to receive a fixing screw 20.
Le carter de la transmission comporte une forme en surplomb 34 venant en arrière des deux vis 20, qui limite l'espace derrière ces vis, obligeant à utiliser des plus courtes que les autres vis de fixation sur le moteur thermique, pour engager sur leur tête 24 une visseuse automatique de serrage.  The transmission casing has an overhanging shape 34 coming behind the two screws 20, which limits the space behind these screws, forcing to use shorter ones than the other fixing screws on the heat engine, to engage on their head. 24 an automatic screwdriver.
Dans cette étape un opérateur positionne le dispositif de maintien en engageant le plot 4 dans un trou brut de fonderie 30 formé sur le côté extérieur du carter de transmission. L'opérateur presse sur le bouton 6, le plot 4 étant maintenu serré grâce à la déformation élastique de ses pattes axiales, qui permettent de s'adapter à la forme peu précise du trou 30 formée directement par la fonderie.  In this step an operator positions the holding device by engaging the stud 4 in a rough foundry hole 30 formed on the outer side of the transmission housing. The operator presses the button 6, the stud 4 being held tight thanks to the elastic deformation of its axial tabs, which make it possible to adapt to the inaccurate shape of the hole 30 formed directly by the foundry.
Chaque douille 8 est alignée sur un perçage 36 du carter.  Each bushing 8 is aligned with a bore 36 of the housing.
La figure 5 présente l'engagement dans chaque douille 8 d'une vis de fixation 20, en passant sa tige 22 dans l'ouverture latérale arrière 10. La longueur de cette ouverture arrière 10 est prévue pour que la tête de vis 24 passe en avant de la forme en surplomb 34 du carter.  FIG. 5 shows the engagement in each bushing 8 of a fastening screw 20, by passing its rod 22 into the rear lateral opening 10. The length of this rear opening 10 is designed so that the screw head 24 passes through. before the overhanging form 34 of the housing.
La figure 6 présente l'avance de chaque vis 20 dans le perçage 36 disposé dans l'axe de la douille 8, par l'opérateur qui presse sur la tête de vis 24. La longueur totale de la douille 8 est prévue pour que la tête de vis 24 venant appui sur la face arrière de cette douille, l'extrémité avant de la vis s'arrête légèrement en retrait de la face d'appui avant 38 du carter. La tige de chaque vis 22 est maintenue serrée par le bourrelet intérieur 14 de la douille 8, ce qui permet en particulier de préparer la transmission avec ses vis spécifiques 20 mises en position, et de l'expédier chez le constructeur automobile pour l'assemblage sur le moteur thermique. FIG. 6 shows the advance of each screw 20 in the bore 36 disposed in the axis of the bushing 8, by the operator pressing on the screw head 24. The total length of the bushing 8 is provided so that the screw head 24 coming on the rear face of this sleeve, the front end of the screw stops slightly back from the front support face 38 of the housing. The rod of each screw 22 is held tight by the inner bead 14 of the bushing 8, which allows in particular to prepare the transmission with its specific screws 20 put in position, and to send it to the car manufacturer for assembly on the engine.
Les vis 20 ne dépassant pas de la face d'appui avant 38 du carter, facilite l'accostage de la transmission sur le moteur thermique qui n'est pas gêné par des tiges de vis 22 dépassant de ce carter.  The screws 20 do not protrude from the front support face 38 of the housing, facilitates the docking of the transmission on the engine which is not hindered by screw rods 22 protruding from the housing.
La figure 7 présente après le positionnement de la transmission sur le moteur thermique, le retrait du dispositif de maintien par une traction sur le bouton 6 afin d'extraire le plot 4 du trou 30 du carter de la transmission. Chaque douille 8 sort facilement grâce à l'ouverture latérale totale 12 du côté intérieur de cette douille qui laisse passer la tige de vis 22.  Figure 7 shows after the positioning of the transmission on the engine, removing the holding device by pulling on the button 6 to extract the stud 4 of the hole 30 of the transmission housing. Each bushing 8 easily leaves thanks to the total lateral opening 12 of the inner side of this bushing which allows the screw rod 22 to pass.
La figure 8 présente l'opérateur commençant ensuite le serrage de chaque vis 20 à la main, afin d'engager les premiers filets de l'extrémité avant de la vis dans le perçage taraudé correspondant du moteur thermique 40.  FIG. 8 shows the operator then starting the tightening of each screw 20 by hand, in order to engage the first threads of the front end of the screw in the corresponding threaded hole of the heat engine 40.
En parallèle l'opérateur peut engager les autres vis standard de fixation de la transmission sur le moteur thermique 40, qui peuvent être les vis couramment utilisées pour fixer les différents types de transmission au même poste d'assemblage.  In parallel the operator can engage the other standard screws for fixing the transmission on the engine 40, which can be the screws commonly used to fix the different types of transmission at the same assembly station.
La figure 9 présente ensuite une visseuse automatique 50 comprenant un embout engagé par l'opérateur sur la tête 24 des vis particulières 20, qui passe facilement entre cette tête de vis et la forme en surplomb du carter 34 grâce à la longueur de ces vis qui est suffisamment courte. La visseuse automatique 50 permet en particulier de contrôler les paramètres de serrage des vis particulières 20 comme ceux des autres vis, ce qui donne une uniformité de qualité des serrages.  FIG. 9 then shows an automatic screwdriver 50 comprising a tip engaged by the operator on the head 24 of the particular screws 20, which passes easily between this screw head and the overhanging shape of the casing 34 thanks to the length of these screws which is short enough. The automatic screwdriver 50 makes it possible in particular to control the tightening parameters of the particular screws 20 such as those of the other screws, which gives a uniformity of quality of the tightenings.
Le système de transmission selon l'invention permet de garantir la présence des vis particulières 20 dans les bons perçages, et d'éviter toute inversion avec d'autres vis qui ferait perdre du temps.  The transmission system according to the invention makes it possible to guarantee the presence of the particular screws 20 in the right bores, and to avoid any inversion with other screws which would waste time.

Claims

REVENDICATIONS
1 - Système de transmission de véhicule automobile, comportant un carter de transmission disposant d'un perçage traversant (36), une vis de fixation (20) du carter sur un moteur thermique (40) engagée dans ce perçage (36) suivant une direction avant, et un dispositif de maintien de cette vis de fixation (20) dans le perçage (36), caractérisé en ce que le dispositif de maintien comporte une forme d'accrochage (4) sur le carter, et comporte une douille (8) recevant la tige de vis (22), présentant d'un côté latéral une ouverture arrière (10) permettant un passage de cette tige (22) latéralement dans la douille (8), et du côté opposé une ouverture totale (12) sur toute la longueur permettant un retrait du dispositif en laissant la tige (22) dans le perçage (36). 1 - Motor vehicle transmission system, comprising a transmission housing having a through bore (36), a crankcase mounting screw (20) on a heat engine (40) engaged in this bore (36) in a direction before, and a device for holding this fastening screw (20) in the bore (36), characterized in that the holding device has a hooking shape (4) on the casing, and comprises a socket (8) receiving the screw rod (22), having on one lateral side a rear opening (10) allowing a passage of this rod (22) laterally in the sleeve (8), and the opposite side a total opening (12) on any the length allowing removal of the device leaving the rod (22) in the bore (36).
2 - Système de transmission selon la revendication 1 , caractérisé en ce que le dispositif de maintien comporte deux douilles (8) disposées aux extrémités d'une traverse (2), présentant des axes parallèles.  2 - Transmission system according to claim 1, characterized in that the holding device comprises two sleeves (8) arranged at the ends of a cross member (2) having parallel axes.
3 - Système de transmission selon la revendication 1 ou 2, caractérisé en ce que la forme d'accrochage sur le carter (4) comporte un plot s'ajustant dans un trou du carter (30).  3 - Transmission system according to claim 1 or 2, characterized in that the attachment shape on the housing (4) comprises a stud fitting into a hole of the housing (30).
4 - Système de transmission selon la revendication 3, caractérisé en ce que le plot comporte des pattes axiales qui sont radialement élastiques.  4 - Transmission system according to claim 3, characterized in that the stud has axial lugs which are radially elastic.
5 - Système de transmission selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque douille (8) comporte un bourrelet intérieur de serrage (14) assurant un maintien de la tige de vis (22) engagée dedans.  5 - Transmission system according to any one of the preceding claims, characterized in that each sleeve (8) has an inner clamping bead (14) ensuring a maintenance of the screw rod (22) engaged therein.
6 - Système de transmission selon l'une quelconque des revendications précédentes, caractérisé en ce que le carter de la transmission comporte une forme en surplomb (34) disposée en arrière de la vis (22).  6 - Transmission system according to any one of the preceding claims, characterized in that the transmission housing has an overhanging shape (34) disposed behind the screw (22).
7 - Système de transmission selon l'une quelconque des revendications précédentes, caractérisé en ce que la tête de vis (24) étant en appui sur la face arrière de la douille (8), l'extrémité avant de la tige de vis (22) est disposée en arrière d'une face d'appui avant (38) du carter sur le moteur thermique (40). 7 - Transmission system according to any one of the preceding claims, characterized in that the screw head (24) bears on the rear face of the sleeve (8), the front end of the screw rod (22) is disposed behind a front bearing face (38) of the housing on the engine (40).
8 - Système de transmission selon l'une quelconque des revendications précédentes, caractérisé en ce que la transmission comporte une machine électrique de traction.  8 - Transmission system according to any one of the preceding claims, characterized in that the transmission comprises an electric traction machine.
9 - Système de transmission selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif de maintien est formé par un moulage d'une matière plastique.  9 - Transmission system according to any one of the preceding claims, characterized in that the holding device is formed by a molding of a plastic material.
10 - Procédé d'assemblage sur un moteur thermique (40) d'un système de transmission selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte une étape de préparation de la transmission comprenant la mise en place du dispositif de maintien et l'insertion de vis de fixation (20) dans ce dispositif de maintien, puis une étape de positionnement de la transmission sur le moteur thermique (40), ensuite une étape de retrait du dispositif du maintien, et enfin une étape de serrage des vis de fixation (20) avec une visseuse automatique (50).  10 - A method of assembly on a heat engine (40) of a transmission system according to any one of the preceding claims, characterized in that it comprises a step of preparing the transmission comprising the implementation of the device of maintaining and inserting fixing screws (20) in this holding device, then a step of positioning the transmission on the heat engine (40), then a step of removing the device from the maintenance, and finally a clamping step fixing screws (20) with an automatic screwdriver (50).
PCT/FR2018/052227 2017-10-11 2018-09-12 Motor vehicle transmission system comprising bushings for holding attachment screws WO2019073134A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1759507 2017-10-11
FR1759507A FR3072072B1 (en) 2017-10-11 2017-10-11 AUTOMOTIVE VEHICLE TRANSMISSION SYSTEM COMPRISING SLEEVES FOR HOLDING SCREWS

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WO2019073134A1 true WO2019073134A1 (en) 2019-04-18

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090257822A1 (en) * 2008-04-09 2009-10-15 Gm Global Technology Operations, Inc. Assembly and method for retaining a fastener
EP2221494A1 (en) * 2009-02-17 2010-08-25 Peugeot Citroën Automobiles SA Device for fixing a radial bearing of a vehicle transmission shaft
DE102012220516A1 (en) * 2011-12-01 2013-06-06 Schaeffler Technologies AG & Co. KG Device for supporting mounting of clutch with releaser in clutch housing of gear box, has connection pipe that is inserted into opening of case which is displaceably mounted in fastening unit
FR3040649A1 (en) * 2015-09-07 2017-03-10 Peugeot Citroen Automobiles Sa DEVICE FOR PRE-MAINTAINING AN ELEMENT AND ITS SCREWS BEFORE SCREWING ON AN EQUIPMENT

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090257822A1 (en) * 2008-04-09 2009-10-15 Gm Global Technology Operations, Inc. Assembly and method for retaining a fastener
US7946781B2 (en) 2008-04-09 2011-05-24 Gm Global Technology Operations, Inc. Assembly and method for retaining a fastener
EP2221494A1 (en) * 2009-02-17 2010-08-25 Peugeot Citroën Automobiles SA Device for fixing a radial bearing of a vehicle transmission shaft
DE102012220516A1 (en) * 2011-12-01 2013-06-06 Schaeffler Technologies AG & Co. KG Device for supporting mounting of clutch with releaser in clutch housing of gear box, has connection pipe that is inserted into opening of case which is displaceably mounted in fastening unit
FR3040649A1 (en) * 2015-09-07 2017-03-10 Peugeot Citroen Automobiles Sa DEVICE FOR PRE-MAINTAINING AN ELEMENT AND ITS SCREWS BEFORE SCREWING ON AN EQUIPMENT

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FR3072072B1 (en) 2019-09-27
FR3072072A1 (en) 2019-04-12

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