EP1058786A1 - Motor vehicle starter with reduction gear comprising means forming torsional damper - Google Patents

Motor vehicle starter with reduction gear comprising means forming torsional damper

Info

Publication number
EP1058786A1
EP1058786A1 EP99959501A EP99959501A EP1058786A1 EP 1058786 A1 EP1058786 A1 EP 1058786A1 EP 99959501 A EP99959501 A EP 99959501A EP 99959501 A EP99959501 A EP 99959501A EP 1058786 A1 EP1058786 A1 EP 1058786A1
Authority
EP
European Patent Office
Prior art keywords
housing
crown
starter
toothed
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99959501A
Other languages
German (de)
French (fr)
Other versions
EP1058786B1 (en
Inventor
José IZQUIERDO
Pascal Jacquin
Pierre Valot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Equipements Electriques Moteur SAS
Original Assignee
Valeo Equipements Electriques Moteur SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Equipements Electriques Moteur SAS filed Critical Valeo Equipements Electriques Moteur SAS
Publication of EP1058786A1 publication Critical patent/EP1058786A1/en
Application granted granted Critical
Publication of EP1058786B1 publication Critical patent/EP1058786B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
    • F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
    • F02N15/04—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
    • F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
    • F02N15/04—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears
    • F02N15/043—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the gearing including a speed reducer
    • F02N15/046—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the gearing including a speed reducer of the planetary type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/13—Machine starters
    • Y10T74/131—Automatic
    • Y10T74/137—Reduction gearing

Definitions

  • Motor starter with gear reducer comprising torsion damping means
  • the present invention relates to a motor vehicle starter.
  • the invention relates more particularly to a motor vehicle starter of the type comprising a housing in which is arranged an electric motor whose output shaft rotates a coaxial launcher with the interposition of a reduction gear with planetary gear comprising a crown made of rigid material , internally toothed, which is housed at least partially in a housing cavity in which it is immobilized in rotation by means by cooperation of shapes and which comprises a cylindrical annular skirt internally toothed and closed at its front axial end by a transverse wall d radial orientation drilled in its center for the passage of an output shaft of the reducer.
  • the object of the invention is to propose a new design of a starter of the type mentioned above which overcomes the drawbacks which have just been mentioned.
  • the invention provides a starter, characterized in that the crown comprises studs molded from a flexible material, in particular from elastomer material, which are interposed between the toothed crown and complementary portions of the housing cavity to immobilize the ring gear in rotation relative to the housing and provide a torsional damper function between these two elements.
  • the cylindrical outer surface of the skirt of the ring gear is provided with a peripheral layer of vibration isolation which is molded in said flexible material and which is interposed between the skirt and the complementary portions of the cavity forming a housing for the skirt.
  • the toothed crown; the damping pads and the peripheral vibration isolation layer are produced by overmolding on the ring gear;
  • the crown made of rigid material on the one hand, and the damping pads and the peripheral insulation layer of flexible material on the other hand, are produced simultaneously according to a rigid and flexible bi-material molding technique respectively;
  • the shock absorbing pads extend axially forwards from the external face of the transverse wall of the ring gear and cooperate by their opposite lateral faces of axial orientation with portions of facing surfaces each of which pair laterally delimits a complementary axial groove formed in the cavity of the housing;
  • the ring gear comprises a series of link arms which extend axially, from the external face of its transverse wall, inside the damping pads;
  • the transverse wall of the ring gear comprises a series of axial through holes through each of which extends flexible material for molding a damping pad to constitute a foot for securing the corresponding pad on the ring gear;
  • the damping pads are distributed angularly in a regular manner around the axis of the ring gear;
  • the central bore of the crown defines a bearing for the guiding in rotation of the output shaft of the reduction gear, and the internal surface of the bearing is provided with a layer of vibration isolation which is molded in said flexible material and which is interposed between the internal surface of the bearing and a bearing guide in rotation of the output shaft;
  • the peripheral insulation layer includes an angular indexing rib of the crown in the cavity of the housing.
  • FIG. 1 is a view in partial axial section of an example of realization of a starter of the planetary gearbox type according to the state of the art
  • FIG. 2 is an enlarged view of part of a planetary gearbox starter made in accordance with the teachings of the invention
  • FIG. 3 is a view, in section along line 3-3 of Figure 4, which illustrates the internally toothed ring of the planetary train of Figure 2;
  • FIG. 4 is an axial end view along arrow F4 of Figure 3.
  • FIG. 5 is a detail view in section along line 5-5 of FIG. 3.
  • FIG. 1 shows a motor vehicle starter 10 of the type comprising an electric motor 12, the rotor 14 of which is mounted rotating around an axis XX inside a rear part 16 of the starter housing which is completed by a front part 18 in the form of a hood.
  • the upper part of the starter 10 comprises an electromagnetic contactor 19 which, by means of a fork 20 in the form of a fork, acts in a known manner on a starter 22 which is slidably mounted on a starter shaft 24 coaxial with the shaft outlet 26 of the electric motor 12.
  • the output shaft 26 of the electric motor 12, linked in rotation to the rotor 14, projects axially forwards beyond the front face 28 of the stator 30 and it rotates a pinion 32 which is the sun pinion d 'a planetary gear train 34 which constitutes a gear reducer interposed between the output shaft 26 and the launcher shaft 24.
  • the sun gear 32 cooperates with the planet gears 36 of the planetary gear train 34 which are mounted for rotation about axes 38 which are carried by a transverse plate of radial orientation 40 planet carrier which is linked in rotation to the output shaft 42 of the reduction gear 34 which is linked in rotation to the rear end (not shown) of the starter shaft 24 for the rotary drive of the latter by the output shaft 42.
  • the planetary gear 34 also has a crown 44 internally toothed inside which the satellites 36 mesh and which is immobilized in rotation relative to the starter housing 10.
  • the internal cylindrical surface of the skirt 46 is toothed and it has for this purpose a series of teeth 62 which extend over the entire axial length of the internal toothed surface 61, that is to say notably substantially to the bottom the toothed ring 44 formed by the internal transverse face 64 of the wall 50.
  • the toothed ring 44 is essentially constituted by a cylindrical annular skirt 46 which is open axially at its rear end 48 and whose front end is closed by a transverse wall of radial orientation 50 which is pierced in its center with a hole 52 in which, with the interposition of a socket 54, is rotatably mounted the output shaft 42.
  • the internally toothed crown 34 is a molded piece of rigid plastic material which is molded onto a metal plate 55 which extends in a transverse plane perpendicular to the axis XX and which serves as a support for various components of the starter 10 on which they are assembled by mounting screws 17 which are used in particular to fix together the rear 16 and front 18 parts of the starter housing as well as the contactor 19.
  • FIGS. 2 to 5 The embodiment illustrated in FIGS. 2 to 5 will now be described in detail.
  • this exemplary embodiment there is no transverse intermediate plate for fixing the various components and the two housing parts 16 and 18 are axially tightened. directly by screws 17.
  • the peripheral surface 56 of the skirt 46 of the crown 44 is a cylindrical surface and the toothed crown 44 is received in a complementary hollow cylindrical cavity 58 formed in the cover 18 of the starter housing 10 and which is open axially towards the rear for allow the axial introduction, from right to left by considering FIG. 1, of the ring gear 44 in the cavity 58.
  • the toothed crown 44 is a molded part made of rigid or semi-rigid material, for example plastic or metal, this rigid body of the crown 44 constituting a core coated, in different zones, with parts molded from a material flexible M2 such as for example rubber or an elastomeric material.
  • the rigid material Ml constituting the body of the crown 44 of the planetary gear train 34 allows the transmission of forces in order to ensure the reduction of movement and the rotation drive of the starter shaft 24 by the engine output shaft 26 electric 12, while the parts molded in the flexible material M2 essentially have functions of torsional and vibration damper (s) between the planetary gear 34 and the starter housing elements 10.
  • the cylindrical outer surface 63 of the skirt 46 of rigid material is coated with a peripheral layer C of vibration isolation molded in the flexible material M2 and which is interposed between the skirt 46 and complementary portions of the cavity 58 so that the external peripheral surface 56 of the skirt of the ring gear 44 in contact with the housing element 18, ie the external surface of the peripheral layer C of flexible material M2.
  • the peripheral vibration isolation layer C comprises a rib 66 of axial orientation which is a rib for angular indexing of the crown 44 in the cavity 58 of the two-part housing 16, 18.
  • the ring gear 44 also includes studs P produced by molding in flexible material M2 which provide a torsional damper function between the ring gear 44 and the housing 16, 18 of the starter 10.
  • the studs P are six in number and are distributed angularly in a regular manner around the axis XX of the ring gear 44.
  • the studs P extend axially from rear to front, that is to say from right to left when considering these figures, so as to project axially beyond from the mean transverse plane of the transverse wall 50, from the external transverse face 65 thereof, to be received each in an axial groove 68 formed in the housing or cavity 58 and which open axially towards the rear to allow the axial insertion of the studs P into the grooves 68.
  • each stud P is delimited by two opposite lateral faces 70 of generally axial orientation, each of which cooperates with a portion of face-to-face surface 72 laterally delimiting an additional axial groove 68.
  • peripheral layer C and the pads P are produced simultaneously in an overmolding operation of flexible material M2 around the body or core of rigid material Ml of the toothed ring 44.
  • the transverse wall 50 includes a series of axial through holes 74 through each of which extends material flexible molding M2 of a damping pad P to form a foot 76 for securing the corresponding pad P on the ring gear made of rigid material 44.
  • each stud P has a stowage foot 76 but the invention is not limited to this arrangement.
  • the studs P provide a function of immobilizing the crown 44 in rotation relative to the housing 16, 18 as well as a torsional damper function between the crown 44 and the housing 18, it is necessary to ensure a good tangential connection in rotation between the studs P and the rigid body of the crown 44.
  • the transverse wall 50 comprises, at the level of each stud P, a pair of link arms 78 each of which extends axially towards the rear from the external face 65 of the wall 50 to extend inside the body of material M2 with a corresponding pad P.
  • the invention is not limited to the case where the elements made of flexible material M2 are molded around the rigid body made of material Ml.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Retarders (AREA)
  • Gears, Cams (AREA)

Abstract

The invention concerns a motor vehicle starter (10) comprising a housing (18) wherein is arranged an electric motor (12) driving in rotation a coaxial starter (22) with an interposed reduction gear (34) with planetary gear train including a ring (44) made of rigid material (M1) housed at least partly in a cavity (58) of the housing and comprising a cylindrical annular skirt (46) internally toothed and closed at its axial front end by a radially oriented transverse wall (50) pierced in its centre (52) to allow through an output shaft (42) of the reduction gear; the ring (44) comprises studs (P) moulded in a flexible material (M2), in particular an elastomer material, which are interposed between the toothed ring (44) and matching portions (68) of the housing (16, 18) cavity (58) to lock the toothed ring (44) in rotation relatively to the housing (18) and provide a torsional damping function between those two elements (44, 18).

Description

Démarreur de véhicule automobile à réducteur à engrenages comportant des moyens formant amortisseur de torsion Motor starter with gear reducer comprising torsion damping means
La présente invention concerne un démarreur de véhicule automobile.The present invention relates to a motor vehicle starter.
L'invention concerne plus particulièrement un démarreur de véhicule automobile du type comportant un boîtier dans lequel est agencé un moteur électrique dont l'arbre de sortie entraîne en rotation un lanceur coaxial avec interposition d'un réducteur à train épicycloïdal comportant une couronne en matériau rigide, dentée intérieurement, qui est logée au moins partiellement dans une cavité du boîtier dans laquelle elle est immobilisée en rotation par des moyens par coopération de formes et qui comporte une jupe annulaire cylindrique dentée intérieurement et fermée à son extrémité axiale avant par une paroi transversale d'orientation radiale percée en son centre pour le passage d'un arbre de sortie du réducteur.The invention relates more particularly to a motor vehicle starter of the type comprising a housing in which is arranged an electric motor whose output shaft rotates a coaxial launcher with the interposition of a reduction gear with planetary gear comprising a crown made of rigid material , internally toothed, which is housed at least partially in a housing cavity in which it is immobilized in rotation by means by cooperation of shapes and which comprises a cylindrical annular skirt internally toothed and closed at its front axial end by a transverse wall d radial orientation drilled in its center for the passage of an output shaft of the reducer.
Les temps de compression du moteur thermique, pendant la phase d'entraînement, provoquent des variations de charge et des rattrapages de jeux angulaires dans les différents engrenages. Il en résulte des vibrations et des chocs nuisibles à la durée de vie du démarreur. Ce phénomène est accompagné d'une émission sonore suffisamment intense pour être perçue désagréablement par 1 'utilisateur . Selon une conception connue, afin de réduire les fortes surcharges mécaniques transmises aux organes tournants du démarreur, qui résultent des brusques variations de vitesse (s) apparaissant durant la période de démarrage du fait des brusques ralentissements du moteur thermique qui peuvent survenir suite aux premières explosions trop en avance par rapport au passage au point mort haut des pistons, il a été proposé d'associer à un réducteur à train épicycloïdal un ou plusieurs amortisseurs constitués de blocs de caoutchouc qui arrêtent en rotation la couronne dentée du train d'engrenages. Cette solution est toutefois encombrante, fait appel à des composants supplémentaires et occasionne un coût supplémentaire important tout en compliquant les opérations d'assemblage des composants du réducteur et/ou du démarreur. L'invention a pour objet de proposer une nouvelle conception d'un démarreur du type mentionné précédemment qui remédie aux inconvénients qui viennent d'être évoqués.The compression times of the heat engine, during the drive phase, cause load variations and compensations for angular play in the different gears. This results in vibrations and shocks harmful to the life of the starter. This phenomenon is accompanied by a sufficiently intense sound emission to be perceived unpleasantly by the user. According to a known design, in order to reduce the strong mechanical overloads transmitted to the rotating members of the starter, which result from sudden variations in speed (s) appearing during the start-up period due to sudden decelerations of the thermal engine which can occur following the first explosions. too far ahead of the passage to the top dead center of the pistons, it has been proposed to associate with a planetary gear reducer one or more shock absorbers made of rubber blocks which stop the toothed ring of the gear train in rotation. This solution is however bulky, uses additional components and causes significant additional cost while complicating the assembly operations of the components of the reducer and / or starter. The object of the invention is to propose a new design of a starter of the type mentioned above which overcomes the drawbacks which have just been mentioned.
Dans ce but, l'invention propose un démarreur, caractérisé en ce que la couronne comporte des plots moulés en un matériau souple, notamment en matériau élastomère, qui sont interposés entre la couronne dentée et des portions complémentaires de la cavité du boîtier pour immobiliser la couronne dentée en rotation par rapport au boîtier et assurer une fonction d'amortisseur de torsion entre ces deux éléments.To this end, the invention provides a starter, characterized in that the crown comprises studs molded from a flexible material, in particular from elastomer material, which are interposed between the toothed crown and complementary portions of the housing cavity to immobilize the ring gear in rotation relative to the housing and provide a torsional damper function between these two elements.
Selon d'autres caractéristiques de l'invention :According to other characteristics of the invention:
- la surface extérieure cylindrique de la jupe de la couronne dentée est munie d'une couche périphérique d'isolation vibratoire qui est moulée dans ledit matériau souple et qui est interposée entre la jupe et les portions complémentaires de la cavité formant logement pour la jupe de la couronne dentée ; les plots amortisseurs et la couche périphérique d'isolation vibratoire sont réalisées par surmoulage sur la couronne dentée ; - la couronne en matériau rigide d'une part, et les plots amortisseurs et la couche périphérique d'isolation en matériau souple d'autre part, sont réalisées simultanément selon une technique de moulage bi-matières rigide et souple respectivement ; - les plots amortisseurs s'étendent axialement vers l'avant à partir de la face externe de la paroi transversale de la couronne dentée et coopèrent par leurs faces latérales opposées d'orientation axiale avec des portions de surfaces en vis-à-vis dont chaque paire délimite latéralement une rainure axiale complémentaire formée dans la cavité du boîtier ; la couronne dentée comporte une série de bras de liaison qui s'étendent axialement, à partir de la face externe de sa paroi transversale, à l'intérieur des plots amortisseurs ;- The cylindrical outer surface of the skirt of the ring gear is provided with a peripheral layer of vibration isolation which is molded in said flexible material and which is interposed between the skirt and the complementary portions of the cavity forming a housing for the skirt. the toothed crown; the damping pads and the peripheral vibration isolation layer are produced by overmolding on the ring gear; - The crown made of rigid material on the one hand, and the damping pads and the peripheral insulation layer of flexible material on the other hand, are produced simultaneously according to a rigid and flexible bi-material molding technique respectively; the shock absorbing pads extend axially forwards from the external face of the transverse wall of the ring gear and cooperate by their opposite lateral faces of axial orientation with portions of facing surfaces each of which pair laterally delimits a complementary axial groove formed in the cavity of the housing; the ring gear comprises a series of link arms which extend axially, from the external face of its transverse wall, inside the damping pads;
- la paroi transversale de la couronne dentée comporte une série de trous axiaux débouchants à travers chacun desquels s'étend du matériau souple de moulage d'un plot amortisseur pour constituer un pied d'arrimage du plot correspondant sur la couronne dentée ; - les plots amortisseurs sont répartis angulairement de manière régulière autour de l'axe de la couronne dentée ;- The transverse wall of the ring gear comprises a series of axial through holes through each of which extends flexible material for molding a damping pad to constitute a foot for securing the corresponding pad on the ring gear; - The damping pads are distributed angularly in a regular manner around the axis of the ring gear;
- le perçage central de la couronne délimite un palier pour le guidage en rotation de l'arbre de sortie du réducteur, et la surface interne du palier est munie d'une couche d'isolation vibratoire qui est moulée dans ledit matériau souple et qui est interposée entre la surface interne du palier et un coussinet de guidage en rotation de l'arbre de sortie ;- The central bore of the crown defines a bearing for the guiding in rotation of the output shaft of the reduction gear, and the internal surface of the bearing is provided with a layer of vibration isolation which is molded in said flexible material and which is interposed between the internal surface of the bearing and a bearing guide in rotation of the output shaft;
- la couche périphérique d'isolation comporte une nervure d'indexation angulaire de la couronne dans la cavité du boîtier.- The peripheral insulation layer includes an angular indexing rib of the crown in the cavity of the housing.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels : - la figure 1 est une vue en section axiale partielle d'un exemple de réalisation d'un démarreur du type à réducteur à train épicycloïdal selon l'état de la technique ;Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which: FIG. 1 is a view in partial axial section of an example of realization of a starter of the planetary gearbox type according to the state of the art;
- la figure 2 est une vue à plus grande échelle d'une partie d'un démarreur à réducteur à train épicycloïdal réalisé conformément aux enseignements de l'invention ;- Figure 2 is an enlarged view of part of a planetary gearbox starter made in accordance with the teachings of the invention;
- la figure 3 est une vue, en section selon la ligne 3-3 de la figure 4, qui illustre la couronne dentée intérieurement du train épicycloïdal de la figure 2 ;- Figure 3 is a view, in section along line 3-3 of Figure 4, which illustrates the internally toothed ring of the planetary train of Figure 2;
- la figure 4 est une vue axiale en bout selon la flèche F4 de la figure 3 ; et- Figure 4 is an axial end view along arrow F4 of Figure 3; and
- la figure 5 est une vue de détail en section selon la ligne 5-5 de la figure 3.FIG. 5 is a detail view in section along line 5-5 of FIG. 3.
On a représenté sur la figure 1 un démarreur 10 de véhicule automobile du type comportant un moteur électrique 12 dont le rotor 14 est monté tournant, autour d'un axe X-X à l'intérieur d'une partie arrière 16 du boîtier du démarreur qui est complétée par une partie avant 18 en forme de capot.FIG. 1 shows a motor vehicle starter 10 of the type comprising an electric motor 12, the rotor 14 of which is mounted rotating around an axis XX inside a rear part 16 of the starter housing which is completed by a front part 18 in the form of a hood.
La partie supérieure du démarreur 10 comporte un contacteur électromagnétique 19 qui, par l'intermédiaire d'un levier 20 en forme de fourche, agit de manière connue sur un lanceur 22 qui est monté coulissant sur un arbre de lanceur 24 coaxial à l'arbre de sortie 26 du moteur électrique 12. L'arbre de sortie 26 du moteur électrique 12, lié en rotation au rotor 14, fait saillie axialement vers l'avant au- delà de la face avant 28 du stator 30 et il entraîne en rotation un pignon 32 qui est le pignon solaire d'un train épicycloïdal 34 qui constitue un réducteur à engrenages interposé entre l'arbre de sortie 26 et l'arbre de lanceur 24.The upper part of the starter 10 comprises an electromagnetic contactor 19 which, by means of a fork 20 in the form of a fork, acts in a known manner on a starter 22 which is slidably mounted on a starter shaft 24 coaxial with the shaft outlet 26 of the electric motor 12. The output shaft 26 of the electric motor 12, linked in rotation to the rotor 14, projects axially forwards beyond the front face 28 of the stator 30 and it rotates a pinion 32 which is the sun pinion d 'a planetary gear train 34 which constitutes a gear reducer interposed between the output shaft 26 and the launcher shaft 24.
Le pignon solaire 32 coopère avec les pignons satellites 36 du train épicycloïdal 34 qui sont montés à rotation autour d'axes 38 qui sont portés par un plateau transversal d'orientation radiale 40 porte-satellites qui est lié en rotation à l'arbre de sortie 42 du réducteur 34 qui est lié en rotation à l'extrémité arrière (non représentée) de l'arbre de lanceur 24 pour l'entraînement en rotation de ce dernier par l'arbre de sortie 42. Le train épicycloïdal 34 comporte aussi une couronne 44 dentée intérieurement à l'intérieur de laquelle engrènent les satellites 36 et qui est immobilisée en rotation par rapport au boîtier du démarreur 10.The sun gear 32 cooperates with the planet gears 36 of the planetary gear train 34 which are mounted for rotation about axes 38 which are carried by a transverse plate of radial orientation 40 planet carrier which is linked in rotation to the output shaft 42 of the reduction gear 34 which is linked in rotation to the rear end (not shown) of the starter shaft 24 for the rotary drive of the latter by the output shaft 42. The planetary gear 34 also has a crown 44 internally toothed inside which the satellites 36 mesh and which is immobilized in rotation relative to the starter housing 10.
La surface cylindrique interne de la jupe 46 est dentée et elle comporte à cet effet une série de dents 62 qui s'étendent sur toute la longueur axiale de la surface interne dentée 61, c'est-à-dire notamment sensiblement jusqu'au fond de la couronne dentée 44 constituée par la face transversale interne 64 de la paroi 50. La couronne dentée 44 est constituée pour l'essentiel par une jupe annulaire cylindrique 46 qui est ouverte axialement à son extrémité arrière 48 et dont l'extrémité avant est fermée par une paroi transversale d'orientation radiale 50 qui est percée en son centre d'un trou 52 dans lequel, avec interposition d'une douille 54, est monté à rotation l'arbre de sortie 42.The internal cylindrical surface of the skirt 46 is toothed and it has for this purpose a series of teeth 62 which extend over the entire axial length of the internal toothed surface 61, that is to say notably substantially to the bottom the toothed ring 44 formed by the internal transverse face 64 of the wall 50. The toothed ring 44 is essentially constituted by a cylindrical annular skirt 46 which is open axially at its rear end 48 and whose front end is closed by a transverse wall of radial orientation 50 which is pierced in its center with a hole 52 in which, with the interposition of a socket 54, is rotatably mounted the output shaft 42.
Dans cet exemple de réalisation selon l'état de la technique, la couronne dentée intérieurement 34 est une pièce moulée en matière plastique rigide qui est surmoulée sur une plaque métallique 55 qui s'étend dans un plan transversal perpendiculaire à l'axe X-X et qui sert de support à différents composants du démarreur 10 sur laquelle ils sont assemblés par des vis de montage 17 qui interviennent notamment pour fixer ensemble les parties arrière 16 et avant 18 du boîtier du démarreur ainsi que le contacteur 19.In this embodiment according to the state of the art, the internally toothed crown 34 is a molded piece of rigid plastic material which is molded onto a metal plate 55 which extends in a transverse plane perpendicular to the axis XX and which serves as a support for various components of the starter 10 on which they are assembled by mounting screws 17 which are used in particular to fix together the rear 16 and front 18 parts of the starter housing as well as the contactor 19.
On décrira maintenant en détail le mode de réalisation illustré aux figures 2 à 5. Dans cet exemple de réalisation, il n'y a pas de plaque intermédiaire transversale pour la fixation des différents composants et les deux parties de boîtier 16 et 18 sont serrées axialement directement par des vis 17.The embodiment illustrated in FIGS. 2 to 5 will now be described in detail. In this exemplary embodiment, there is no transverse intermediate plate for fixing the various components and the two housing parts 16 and 18 are axially tightened. directly by screws 17.
La surface périphérique 56 de la jupe 46 de la couronne 44 est une surface cylindrique et la couronne dentée 44 est reçue dans une cavité cylindrique creuse complémentaire 58 formée dans le capot 18 du boîtier du démarreur 10 et qui est ouverte axialement vers l'arrière pour permettre l'introduction axiale, de la droite vers la gauche en considérant la figure 1, de la couronne dentée 44 dans la cavité 58.The peripheral surface 56 of the skirt 46 of the crown 44 is a cylindrical surface and the toothed crown 44 is received in a complementary hollow cylindrical cavity 58 formed in the cover 18 of the starter housing 10 and which is open axially towards the rear for allow the axial introduction, from right to left by considering FIG. 1, of the ring gear 44 in the cavity 58.
Plus précisément, la couronne dentée 44 est une pièce moulée en matériau rigide ou semi-rigide, par exemple en matière plastique ou en métal, ce corps rigide de la couronne 44 constituant un noyau revêtu, dans différentes zones, de parties moulées en un matériau souple M2 tel que par exemple du caoutchouc ou un matériau élastomère.More specifically, the toothed crown 44 is a molded part made of rigid or semi-rigid material, for example plastic or metal, this rigid body of the crown 44 constituting a core coated, in different zones, with parts molded from a material flexible M2 such as for example rubber or an elastomeric material.
Le matériau rigide Ml constitutif du corps de la couronne 44 du train épicycloïdal 34 permet la transmission des efforts afin d'assurer la réduction de mouvement et l'entraînement en rotation de l'arbre du lanceur 24 par l'arbre 26 de sortie du moteur électrique 12, tandis que les parties moulées dans le matériau souple M2 ont essentiellement des fonctions d' amortisseur (s) de torsion et de vibration entre le train épicycloïdal 34 et les éléments de boîtier du démarreur 10. Ainsi, la surface extérieure cylindrique 63 de la jupe 46 en matériau rigide est revêtue d'une couche périphérique C d'isolation vibratoire moulée dans le matériau souple M2 et qui est interposée entre la jupe 46 et des portions complémentaires de la cavité 58 de manière que la surface périphérique externe 56 de la jupe de la couronne dentée 44 en contact avec l'élément de boîtier 18 soit la surface externe de la couche périphérique C en matériau souple M2. Comme on peut le voir sur les figures, la couche périphérique d'isolation vibratoire C comporte une nervure 66 d'orientation axiale qui est une nervure d'indexation angulaire de la couronne 44 dans la cavité 58 du boîtier en deux parties 16, 18.The rigid material Ml constituting the body of the crown 44 of the planetary gear train 34 allows the transmission of forces in order to ensure the reduction of movement and the rotation drive of the starter shaft 24 by the engine output shaft 26 electric 12, while the parts molded in the flexible material M2 essentially have functions of torsional and vibration damper (s) between the planetary gear 34 and the starter housing elements 10. Thus, the cylindrical outer surface 63 of the skirt 46 of rigid material is coated with a peripheral layer C of vibration isolation molded in the flexible material M2 and which is interposed between the skirt 46 and complementary portions of the cavity 58 so that the external peripheral surface 56 of the skirt of the ring gear 44 in contact with the housing element 18, ie the external surface of the peripheral layer C of flexible material M2. As can be seen in the figures, the peripheral vibration isolation layer C comprises a rib 66 of axial orientation which is a rib for angular indexing of the crown 44 in the cavity 58 of the two-part housing 16, 18.
La couronne dentée 44 comporte aussi des plots P réalisés par moulage en matériau souple M2 qui assurent une fonction d'amortisseur de torsion entre la couronne dentée 44 et le boîtier 16, 18 du démarreur 10. Dans l'exemple illustré sur les figures, les plots P sont au nombre de six et sont répartis angulairement de manière régulière autour de l'axe X-X de la couronne dentée 44.The ring gear 44 also includes studs P produced by molding in flexible material M2 which provide a torsional damper function between the ring gear 44 and the housing 16, 18 of the starter 10. In the example illustrated in the figures, the studs P are six in number and are distributed angularly in a regular manner around the axis XX of the ring gear 44.
Comme on peut le voir aux figures 2 à 4, cinq des plots P sont identiques tandis que le sixième plot, c'est-à-dire le plot supérieur en considérant les figures qui est adjacent à la nervure d'indexation angulaire 66, présente une longueur axiale réduite vers l'avant, notamment pour faciliter l'agencement du levier 20.As can be seen in Figures 2 to 4, five of the pads P are identical while the sixth pad, that is to say the upper pad considering the figures which is adjacent to the angular indexing rib 66, has a reduced axial length towards the front, in particular to facilitate the arrangement of the lever 20.
Comme on le voit aux figures 2 et 3, les plots P s'étendent axialement d'arrière en avant, c'est-à-dire de la droite vers la gauche en considérant ces figures, de manière à faire saillie axialement au-delà du plan transversal moyen de la paroi transversale 50, à partir de la face transversale externe 65 de celle-ci, pour être reçus chacun dans une rainure axiale 68 formée dans le logement ou cavité 58 et qui débouchent axialement vers l'arrière pour permettre l'introduction axiale des plots P dans les rainures 68.As can be seen in FIGS. 2 and 3, the studs P extend axially from rear to front, that is to say from right to left when considering these figures, so as to project axially beyond from the mean transverse plane of the transverse wall 50, from the external transverse face 65 thereof, to be received each in an axial groove 68 formed in the housing or cavity 58 and which open axially towards the rear to allow the axial insertion of the studs P into the grooves 68.
Plus précisément, chaque plot P est délimité par deux faces latérales opposées 70 d'orientation globalement axiale dont chacune coopère avec une portion de surface en vis-à-vis 72 délimitant latéralement une rainure axiale 68 complémentaire.More precisely, each stud P is delimited by two opposite lateral faces 70 of generally axial orientation, each of which cooperates with a portion of face-to-face surface 72 laterally delimiting an additional axial groove 68.
Dans l'exemple illustré sur les figures, la couche périphérique C et les plots P sont réalisés simultanément en une opération de surmoulage de matériau souple M2 autour du corps ou noyau en matériau rigide Ml de la couronne dentée 44.In the example illustrated in the figures, the peripheral layer C and the pads P are produced simultaneously in an overmolding operation of flexible material M2 around the body or core of rigid material Ml of the toothed ring 44.
Pour obtenir un bon accrochage des plots surmoulés P, la paroi transversale 50 comporte une série de trous axiaux débouchants 74 à travers chacun desquels s'étend du matériau souple de moulage M2 d'un plot amortisseur P pour constituer un pied 76 d'arrimage du plot correspondant P sur la couronne dentée en matériau rigide 44.To obtain good attachment of the overmolded studs P, the transverse wall 50 includes a series of axial through holes 74 through each of which extends material flexible molding M2 of a damping pad P to form a foot 76 for securing the corresponding pad P on the ring gear made of rigid material 44.
Dans l'exemple illustré sur les figures, chaque plot P comporte un pied d'arrimage 76 mais l'invention n'est pas limitée à cet agencement.In the example illustrated in the figures, each stud P has a stowage foot 76 but the invention is not limited to this arrangement.
Dans la mesure où les plots P assurent une fonction d'immobilisation en rotation de la couronne 44 par rapport au boîtier 16, 18 ainsi qu'une fonction d'amortisseur en torsion entre la couronne 44 et le boîtier 18, il est nécessaire d'assurer une bonne liaison tangentielle en rotation entre les plots P et le corps rigide de la couronne 44.Insofar as the studs P provide a function of immobilizing the crown 44 in rotation relative to the housing 16, 18 as well as a torsional damper function between the crown 44 and the housing 18, it is necessary to ensure a good tangential connection in rotation between the studs P and the rigid body of the crown 44.
A cet effet, comme on peut le voir à la figure 5, la paroi transversale 50 comporte, au droit de chaque plot P, une paire de bras de liaison 78 dont chacun s'étend axialement vers l'arrière à partir de la face externe 65 de la paroi 50 pour s'étendre à l'intérieur du corps en matériau M2 d'un plot correspondant P.For this purpose, as can be seen in FIG. 5, the transverse wall 50 comprises, at the level of each stud P, a pair of link arms 78 each of which extends axially towards the rear from the external face 65 of the wall 50 to extend inside the body of material M2 with a corresponding pad P.
Selon une variante de réalisation non représentée sur les figures, et toujours afin de limiter la transmission des bruits nuisibles, il est possible de munir la surface interne du perçage 52 du corps en matériau rigide Ml de la couronne dentéeAccording to an alternative embodiment not shown in the figures, and still in order to limit the transmission of harmful noise, it is possible to provide the internal surface of the bore 52 of the body with a rigid material Ml of the toothed crown.
44 avec une couche périphérique interne en matériau souple M2.44 with an internal peripheral layer of flexible material M2.
L'invention n'est pas limitée au cas où les éléments en matériau souple M2 sont surmoulés autour du corps rigide en matériau Ml.The invention is not limited to the case where the elements made of flexible material M2 are molded around the rigid body made of material Ml.
Il est aussi possible de réaliser la couronne 44 en matériau rigide Ml d'une part et les éléments moulés en matériau souple M2 d'autre part simultanément selon une technique de moulage bi-matières. It is also possible to produce the crown 44 in rigid material Ml on the one hand and the molded elements in flexible material M2 on the other hand simultaneously according to a bi-material molding technique.

Claims

REVENDICATIONS
1. Démarreur (10) de véhicule automobile comportant un boîtier (18) dans lequel est agencé un moteur électrique (12) doté d'un arbre de sortie (26) qui entraîne en rotation un lanceur coaxial (22) avec interposition d'un réducteur (34) à train épicycloïdal comportant une couronne (44) en matériau rigide (Ml) , dentée intérieurement (62) , qui est logée au moins partiellement dans une cavité (58) du boîtier et qui comporte une jupe annulaire cylindrique (46) dentée intérieurement et fermée à son extrémité axiale avant par une paroi transversale d'orientation radiale (50) percée en son centre (52) pour le passage d'un arbre de sortie (42) du réducteur, caractérisé en ce que la couronne (44) comporte des plots (P) moulés en un matériau souple (M2) , notamment en matériau élastomère, qui sont interposés entre la couronne dentée (44) et des portions complémentaires (68) de la cavité (58) du boîtier (16, 18) pour immobiliser la couronne dentée (44) en rotation par rapport au boîtier (18) et assurer une fonction d'amortisseur de torsion entre ces deux éléments (44, 18) .1. Motor vehicle starter (10) comprising a housing (18) in which is arranged an electric motor (12) provided with an output shaft (26) which rotates a coaxial launcher (22) with the interposition of a reduction gear (34) with planetary gear comprising a crown (44) of rigid material (MI), internally toothed (62), which is housed at least partially in a cavity (58) of the housing and which comprises a cylindrical annular skirt (46) internally toothed and closed at its front axial end by a transverse wall of radial orientation (50) pierced in its center (52) for the passage of an output shaft (42) of the reduction gear, characterized in that the crown (44 ) comprises studs (P) molded from a flexible material (M2), in particular from elastomeric material, which are interposed between the toothed ring (44) and complementary portions (68) of the cavity (58) of the housing (16, 18 ) to immobilize the toothed crown (44) in ro tation relative to the housing (18) and provide a torsional damper function between these two elements (44, 18).
2. Démarreur selon la revendication précédente, caractérisé en ce que la surface extérieure cylindrique (63) de la jupe (46) de la couronne dentée (44) est munie d'une couche périphérique (C) d'isolation vibratoire qui est moulée dans ledit matériau souple (M2) et qui est interposée entre la jupe (46) et les portions complémentaires de la cavité formant logement (58) pour la jupe de la couronne dentée.2. Starter according to the preceding claim, characterized in that the cylindrical outer surface (63) of the skirt (46) of the ring gear (44) is provided with a peripheral layer (C) of vibration isolation which is molded in said flexible material (M2) and which is interposed between the skirt (46) and the complementary portions of the cavity forming housing (58) for the skirt of the toothed crown.
3. Démarreur selon la revendication précédente, caractérisé en ce que les plots amortisseurs (P) et la couche périphérique (C) d'isolation vibratoire sont réalisés par surmoulage sur la couronne dentée (44) .3. Starter according to the preceding claim, characterized in that the damping pads (P) and the peripheral layer (C) of vibration isolation are produced by overmolding on the ring gear (44).
4. Démarreur selon la revendication 2, caractérisé en ce que la couronne en matériau rigide (Ml) d'une part, et les plots amortisseurs (P) et la couche périphérique (C) d'isolation en matériau souple d'autre part, sont réalisées simultanément selon une technique de moulage bi-matières rigide (Ml) et souple (M2) respectivement . 4. Starter according to claim 2, characterized in that the crown made of rigid material (Ml) on the one hand, and the damping pads (P) and the peripheral layer (C) of insulation made of flexible material on the other hand, are produced simultaneously according to a rigid (Ml) and flexible (M2) bi-material molding technique respectively.
5. Démarreur selon la revendication précédente, caractérisé en ce que les plots amortisseurs (P) s'étendent axialement vers l'avant à partir de la face externe (65) de la paroi transversale (50) de la couronne dentée (44) et coopèrent par leurs faces latérales opposées (40) d'orientation axiale avec des portions de surfaces en vis-à-vis (72) dont chaque paire délimite latéralement une rainure axiale (68) complémentaire formée dans la cavité (58) du boîtier (18).5. Starter according to the preceding claim, characterized in that the damping pads (P) extend axially forward from the external face (65) of the transverse wall (50) of the ring gear (44) and cooperate by their opposite lateral faces (40) of axial orientation with facing portions of surfaces (72), each pair of which laterally delimits a complementary axial groove (68) formed in the cavity (58) of the housing (18 ).
6. Démarreur selon la revendication précédente, caractérisé en ce que la couronne dentée (44) comporte une série de bras de liaison (76) qui s'étendent axialement, à partir de la face externe (65) de sa paroi transversale (50), à l'intérieur des plots amortisseurs (P) .6. Starter according to the preceding claim, characterized in that the ring gear (44) comprises a series of link arms (76) which extend axially, from the external face (65) of its transverse wall (50) , inside the shock absorbing pads (P).
7. Démarreur selon la revendication 5, caractérisé en ce que la paroi transversale (50) de la couronne dentée comporte une série de trous axiaux débouchants (74) à travers chacun desquels s'étend du matériau souple de moulage (M2) d'un plot amortisseur (P) pour constituer un pied (76) d'arrimage du plot (P) correspondant sur la couronne dentée (44) . 7. Starter according to claim 5, characterized in that the transverse wall (50) of the ring gear comprises a series of axial through holes (74) through each of which extends flexible molding material (M2) of shock absorber pad (P) to form a foot (76) for securing the corresponding pad (P) on the ring gear (44).
8. Démarreur selon la revendication précédente, caractérisé en ce que les plots amortisseurs (P) sont répartis angulairement de manière régulière autour de l'axe (X-X) de la couronne dentée (44) .8. Starter according to the preceding claim, characterized in that the damping pads (P) are distributed angularly in a regular manner around the axis (X-X) of the toothed ring (44).
9. Démarreur selon la revendication précédente, caractérisé en ce que le perçage central (52) de la couronne délimite un palier pour le guidage en rotation de l'arbre de sortie (42) du réducteur (34) , et en ce que la surface interne (52) du palier est munie d'une couche d'isolation vibratoire qui est moulée dans ledit matériau souple (M2) et qui est interposée entre la surface interne du palier et un coussinet (54) de guidage en rotation de l'arbre de sortie.9. Starter according to the preceding claim, characterized in that the central bore (52) of the crown delimits a bearing for the rotational guidance of the output shaft (42) of the reduction gear (34), and in that the surface internal (52) of the bearing is provided with a layer of vibration isolation which is molded in said flexible material (M2) and which is interposed between the internal surface of the bearing and a bearing (54) for guiding in rotation of the shaft Release.
10. Démarreur selon la revendication 2, caractérisé en ce que la couche périphérique (C) d'isolation comporte une nervure10. Starter according to claim 2, characterized in that the peripheral insulation layer (C) has a rib
(66) d'indexation angulaire de la couronne (44) dans la cavité (58) du boîtier (16, 18) . (66) for angular indexing of the crown (44) in the cavity (58) of the housing (16, 18).
EP99959501A 1998-12-23 1999-12-20 Motor vehicle starter with reduction gear comprising means forming torsional damper Expired - Lifetime EP1058786B1 (en)

Applications Claiming Priority (3)

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FR9816310 1998-12-23
FR9816310A FR2787833B1 (en) 1998-12-23 1998-12-23 STARTER OF A MOTOR VEHICLE WITH GEAR REDUCER COMPRISING TORSION SHOCK ABSORBER MEANS
PCT/FR1999/003209 WO2000039454A1 (en) 1998-12-23 1999-12-20 Motor vehicle starter with reduction gear comprising means forming torsional damper

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EP1058786A1 true EP1058786A1 (en) 2000-12-13
EP1058786B1 EP1058786B1 (en) 2004-08-04

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EP (1) EP1058786B1 (en)
KR (1) KR100671579B1 (en)
CN (1) CN1205408C (en)
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DE (1) DE69919135T2 (en)
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FR2787833A1 (en) 2000-06-30
KR20010041146A (en) 2001-05-15
DE69919135D1 (en) 2004-09-09
BR9908154A (en) 2000-10-31
WO2000039454A1 (en) 2000-07-06
DE69919135T2 (en) 2005-01-20
US6490940B1 (en) 2002-12-10
CN1291259A (en) 2001-04-11
EP1058786B1 (en) 2004-08-04
FR2787833B1 (en) 2001-03-02
CN1205408C (en) 2005-06-08
KR100671579B1 (en) 2007-01-18

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