EP0854284B1 - Starter for motor vehicule with epicyclic reduction gear having a torque limiter - Google Patents

Starter for motor vehicule with epicyclic reduction gear having a torque limiter Download PDF

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Publication number
EP0854284B1
EP0854284B1 EP98100399A EP98100399A EP0854284B1 EP 0854284 B1 EP0854284 B1 EP 0854284B1 EP 98100399 A EP98100399 A EP 98100399A EP 98100399 A EP98100399 A EP 98100399A EP 0854284 B1 EP0854284 B1 EP 0854284B1
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EP
European Patent Office
Prior art keywords
casing
annular
rotation
starter according
face
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP98100399A
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German (de)
French (fr)
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EP0854284A1 (en
Inventor
Jacques Verot
Charles Girarrot
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Valeo Equipements Electriques Moteur SAS
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Valeo Equipements Electriques Moteur SAS
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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
    • 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
    • Y10T74/134—Clutch connection
    • 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

  • the present invention relates to a vehicle starter automobile.
  • the invention relates more particularly to a starter of the type comprising an electric motor, the output shaft of which rotates a coaxial launcher with the interposition of a planetary gear reducer.
  • the friction device includes a annular friction disc which is rotatably linked to the crown and which is in axial abutment against the internal face of one of the flanges of the case against which the disc of friction is stressed axially by an elastic washer truncated.
  • This design therefore calls for at least two additional components, compared to a planetary gear without torque limiting device, i.e. the washer friction and the elastic tapered washer.
  • the object of the invention is to propose a new design of a starter of the type mentioned above which remedies the disadvantages which have just been mentioned.
  • the invention provides a starter for motor vehicle of the type comprising a gear reducer planetary gear with internally toothed crown and an electric motor with an output shaft, which drives in rotation a coaxial launcher with interposition of the reducer to planetary gear gears having a housing cylindrical inside which the crown of the train epicyclic is rotatably mounted and of the type in which part, the housing has a first side flange and, on the other hand, the crown is linked in rotation to the case by through a friction-limiting torque device interposed axially between the crown and the first flange side of the housing, characterized in that the limiting device of friction torque consists of at least one face lateral annular friction of the crown, which is elastically stressed in axial support against a surface of reaction linked in rotation to the housing.
  • the housing 24 consists essentially of a cylindrical annular skirt 28, by a rear lateral flange 30 disc-shaped, pierced at its center 32 for the passage of sun gear 20 and output shaft 16, and by a flange front side 34 drilled in its center 36 for the passage of the output shaft 38 of the reducer 26, which is intended for rotate the starter launcher (not shown) by means of grooves 40.
  • the cylindrical annular skirt 28 of the housing 24 comprises, in the vicinity of its front axial end 42, a internal radial shoulder 44 against which bears axially the external face 46 of the front flange 34.
  • the rear axial end 48 of the skirt 28 comprises a range 50 for centering the skirt 28 on a part of complementary shape of the front end of the stator 14 of the motor electric 10.
  • the skirt 28 is fixed axially to the stator 14 by a series of tie rods which are not shown in the figure.
  • the annular cylindrical skirt 28 of the housing 24 comprises an internal bore 52 into which is axially introduced the front flange 34, the latter being immobilized in rotation by report to the housing 24 by means of an orientation tab external radial 54 which is received axially in a axial groove 56 formed in the bore 52 and which opens into the open rear axial end 48 of the skirt 28.
  • the planetary gear 22 has a crown annular 58 internally toothed 60 and whose surface cylindrical outer 62 is rotatably mounted inside the bore 52 of the skirt 28.
  • the planetary gear 22 also includes a planet carrier 64 which is linked in rotation to the output shaft 38 and which consists of two plates 66 which rotate toothed satellites 68 which cooperate with the internal toothing 60 of the crown 58 and with the external toothing of the sun gear 20.
  • the output shaft 38 is rotatably mounted in the drilling 36 of the front flange 34 with the interposition of a socket needle 70, while the free front end 72 of the pinion solar 20 is rotatably mounted inside the end rear 74 of the output shaft 38 with the interposition of a series of needles 76.
  • the ring gear 58 is linked in rotation to the skirt 28 of the housing fixed 24 by means of a torque limiting device to friction 80 of which the crown 58 constitutes one of the components.
  • the crown 58 is produced in a material, for example of charged plastic, having good friction and wear resistance characteristics by friction.
  • the toothed crown 58 is delimited laterally by two annular side faces rear 82 and front 84 which constitute two annular friction surfaces of the device torque limiter.
  • the rear annular lateral face 82 is in abutment axial against the internal face opposite 86 of the rear flange 30 of the housing 24.
  • the rear flange 30 in the form of a pierced disc is arranged inside the bore 52 of the skirt 28 in which it is immobilized in rotation via a leg 88 of external radial orientation which is received in the groove 56 of the skirt 28.
  • the rear flange 30 is retained axially at the interior of the skirt 24 by means of a ring 90 which is mounted in an internal radial groove 92 of the bore 52 of the skirt 28.
  • the front annular lateral face 84 of the crown 58 is in axial abutment against the rear annular face 94 of a support washer 96 which is mounted inside the bore 52 and which is immobilized in rotation relative to the housing 24 by via a leg 97 of external radial orientation received in the axial groove 56.
  • An elastic member 98 produced in the form of a tapered washer is mounted axially compressed between the internal annular face 100 of the front transverse flange 34 and the front annular face 102 of the support washer 96.
  • the elastic washer 98 is centered on a span cylindrical 104 of the front transverse flange 34 which extends radially inward.
  • the washer 98 thus ensures a compression force axial of the assembly constituted by the crown 58, the flange rear transverse 30 and the support washer 96 against the stop constituted by the retaining ring 90.
  • the value of the axial elastic force applied by the washer 98 to this set determines the value of the maximum torque permissible exerted by the torque limiting device 80 in association with the value of the friction coefficients existing between the lateral faces 82 and 84 of the crown 58 and the annular faces facing 86 and 94 of the rear flange 30 and the support washer 96.
  • the design according to the invention is particularly axially compact in that it does not use any disc or particular friction washer, this function being ensured by means of the toothed crown 58 properly called.
  • the assembly of the components is particularly easy and all the components of the planetary gear train 22 and the torque limiting device 80 can be assembled to inside the housing 24 and retained in place through of the ring 90, the sub-assembly thus formed possibly being then placed on the stator 14 of the motor 10, the pinion solar 20 associated in rotation with the output shaft 16 of the motor 10 penetrating inside the reducer 26.

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  • 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)
  • Gear Transmission (AREA)

Description

La présente invention concerne un démarreur de véhicule automobile.The present invention relates to a vehicle starter automobile.

L'invention concerne plus particulièrement un démarreur du type comportant un moteur électrique dont l'arbre de sortie entraíne en rotation un lanceur coaxial avec interposition d'un réducteur à engrenages à train épicycloïdal.The invention relates more particularly to a starter of the type comprising an electric motor, the output shaft of which rotates a coaxial launcher with the interposition of a planetary gear reducer.

Afin de limiter la valeur du couple maximal transmissible entre l'arbre de sortie du moteur électrique et l'arbre du lanceur, il est connu de prévoir un dispositif de limitation du couple.In order to limit the value of the maximum torque transmissible between the output shaft of the electric motor and the launcher shaft, it is known to provide a device for torque limitation.

A cet effet, il a déjà été proposé, par exemple dans le document JP-A-06-078.495, un démarreur dont le train épicycloïdal comporte un boítier cylindrique à l'intérieur duquel la couronne, dentée intérieurement, est montée à rotation et du type dans lequel la couronne est liée en rotation au boítier par l'intermédiaire d'un dispositif limiteur de couple à friction interposé axialement entre la couronne et un flasque latéral du boítier.To this end, it has already been proposed, for example in the document JP-A-06-078.495, a starter whose train epicyclic has a cylindrical housing inside from which the crown, toothed internally, is rotatably mounted and of the type in which the crown is linked in rotation to the case via a torque limiting device to friction axially interposed between the crown and a flange side of the case.

Dans ce document, le dispositif à friction comporte un disque annulaire de friction qui est lié en rotation à la couronne et qui est en appui axial contre la face interne de l'un des flasques du boítier contre laquelle le disque de friction est sollicité axialement par une rondelle élastique tronconique.In this document, the friction device includes a annular friction disc which is rotatably linked to the crown and which is in axial abutment against the internal face of one of the flanges of the case against which the disc of friction is stressed axially by an elastic washer truncated.

Cette conception fait donc appel à au moins deux composants supplémentaires, par rapport à un train épicycloïdal sans dispositif limiteur de couple, c'est-à-dire la rondelle de friction et la rondelle tronconique élastique.This design therefore calls for at least two additional components, compared to a planetary gear without torque limiting device, i.e. the washer friction and the elastic tapered washer.

Outre ce nombre de composants importants, la conception proposée dans ce document complique la conception de la couronne du train épicycloïdal, augmente l'encombrement axial du train épicycloïdal et rend particulièrement complexes les opérations d'assemblage des différents composants.Besides this number of important components, the design proposed in this document complicates the design of the crown of the planetary gear train, increases the axial size of the train epicyclic and makes operations particularly complex of the various components.

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 object of the invention is to propose a new design of a starter of the type mentioned above which remedies the disadvantages which have just been mentioned.

Dans ce but, l'invention propose un démarreur de véhicule automobile du type comportant un réducteur à engrenages à train épicycloïdal doté d'une couronne dentée intérieurement et un moteur électrique doté d'un arbre de sortie, qui entraíne en rotation un lanceur coaxial avec interposition du réducteur à engrenages à train épicycloïdal comportant un boítier cylindrique à l'intérieur duquel la couronne du train épicycloïdal est montée à rotation et du type dans lequel, d'une part, le boítier comporte un premier flasque latéral et, d'autre part, la couronne est liée en rotation au boítier par l'intermédiaire d'un dispositif limiteur de couple à friction interposé axialement entre la couronne et le premier flasque latéral du boítier, caractérisé en ce que le dispositif limiteur de couple à friction est constitué par au moins une face latérale annulaire de frottement de la couronne, qui est sollicitée élastiquement en appui axial contre une surface de réaction liée en rotation au boítier.To this end, the invention provides a starter for motor vehicle of the type comprising a gear reducer planetary gear with internally toothed crown and an electric motor with an output shaft, which drives in rotation a coaxial launcher with interposition of the reducer to planetary gear gears having a housing cylindrical inside which the crown of the train epicyclic is rotatably mounted and of the type in which part, the housing has a first side flange and, on the other hand, the crown is linked in rotation to the case by through a friction-limiting torque device interposed axially between the crown and the first flange side of the housing, characterized in that the limiting device of friction torque consists of at least one face lateral annular friction of the crown, which is elastically stressed in axial support against a surface of reaction linked in rotation to the housing.

Selon d'autres caractéristiques de l'invention :

  • la surface de réaction est la face interne d'un second flasque latéral que comporte le boítier ;
  • la couronne est délimitée latéralement par deux faces latérales annulaires arrière et avant tandis que le boítier comporte un flasque latérale avant et un flasque latéral arrière, le premier flasque latéral étant le flasque avant du boítier tandis que le second flasque latéral est le flasque arrière du boítier et la face latérale annulaire arrière de la couronne est en appui axial contre la face interne du flasque arrière annulaire du boítier traversé par l'extrémité libre de l'arbre du moteur qui entraíne en rotation le pignon solaire que comporte le réducteur;
  • un organe élastique est monté comprimé axialement entre la face latérale annulaire avant de la couronne et la face interne du flasque avant du boítier traversé par l'arbre de sortie du réducteur lié en rotation au porte-satellites que comporte le réducteur;
  • les deux faces latérales annulaires de la couronne constituent deux surfaces de frottement du dispositif limiteur de couple, et la face latérale annulaire avant de la couronne est en appui axial contre la face annulaire arrière d'une rondelle d'appui, liée en rotation au boítier et montée coulissante axialement par rapport à ce dernier, dont la face annulaire avant constitue une surface d'appui pour un organe élastique ;
  • l'organe élastique est une rondelle élastique tronconique ;
  • la couronne dentée intérieurement est réalisée dans un matériau possédant de bonnes caractéristiques de frottement et de résistance à l'usure ;
  • le boítier comporte une jupe annulaire cylindrique dont l'extrémité arrière est ouverte, et le flasque arrière est un disque annulaire arrière percé en son centre pour le passage de l'arbre du moteur, retenu axialement à l'intérieur du boítier et immobilisé en rotation par rapport à ce dernier ;
  • le disque arrière est retenu à l'intérieur du boítier par un anneau de butée monté dans une gorge radiale interne de la jupe du boítier ;
  • le flasque avant du boítier est un disque annulaire avant percé en son centre pour le passage de l'arbre de sortie du réducteur et qui prend appui axialement contre un épaulement radial interne de la jupe du boítier ;
  • le perçage central du disque avant du boítier reçoit un palier pour le guidage en rotation de l'arbre de sortie du réducteur ;
  • l'extrémité arrière de la jupe comporte une portée de centrage du boítier sur le stator du moteur électrique ;
  • la face interne du disque avant comporte une portée cylindrique pour le centrage de la rondelle élastique ;
  • le disque avant est immobilisé en rotation par rapport à la jupe du boítier ;
  • le disque arrière et le disque avant comportent chacun une patte radiale, et la jupe du boítier comporte une rainure axiale dans laquelle sont reçues lesdites pattes radiales pour l'immobilisation en rotation de ces composants par rapport au boítier.
According to other characteristics of the invention:
  • the reaction surface is the internal face of a second lateral flange which comprises the housing;
  • the crown is delimited laterally by two annular lateral faces rear and front while the case comprises a front lateral flange and a rear lateral flange, the first lateral flange being the front flange of the case while the second lateral flange is the rear flange of the case and the annular rear lateral face of the crown is in axial abutment against the internal face of the annular rear flange of the housing crossed by the free end of the motor shaft which rotates the sun pinion which the reducer comprises;
  • an elastic member is mounted compressed axially between the front annular lateral face of the crown and the internal face of the front flange of the housing through which the output shaft of the reducer is linked in rotation to the planet carrier that the reducer comprises;
  • the two annular lateral faces of the crown constitute two friction surfaces of the torque limiting device, and the front annular lateral face of the crown is in axial abutment against the rear annular face of a support washer, linked in rotation to the housing and slidably mounted axially with respect to the latter, the front annular face of which constitutes a bearing surface for an elastic member;
  • the elastic member is a frustoconical elastic washer;
  • the internally toothed crown is made of a material having good friction and wear resistance characteristics;
  • the housing comprises a cylindrical annular skirt whose rear end is open, and the rear flange is a rear annular disc pierced in its center for the passage of the motor shaft, retained axially inside the housing and immobilized in rotation compared to the latter;
  • the rear disc is retained inside the housing by a stop ring mounted in an internal radial groove of the skirt of the housing;
  • the front flange of the housing is a front annular disc pierced in its center for the passage of the output shaft of the reduction gear and which bears axially against an internal radial shoulder of the skirt of the housing;
  • the central bore of the front disc of the housing receives a bearing for the guiding in rotation of the output shaft of the reduction gear;
  • the rear end of the skirt has a housing for centering the housing on the stator of the electric motor;
  • the inner face of the front disc has a cylindrical surface for centering the elastic washer;
  • the front disc is immobilized in rotation relative to the skirt of the housing;
  • the rear disc and the front disc each have a radial lug, and the housing skirt has an axial groove in which said radial lugs are received for the immobilization in rotation of these components relative to the housing.

D'autres caractéristiques et avantages de l'invention apparaítront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera au dessin annexé dont la figure unique est une vue en section axiale partielle du moteur électrique d'un démarreur associé à son train épicycloïdal comportant un dispositif limiteur de couple réalisé conformément aux enseignements de l'invention.Other characteristics and advantages of the invention will appear on reading the following detailed description for the understanding of which we will refer to the drawing annexed, the single figure of which is a view in axial section partial of the electric motor of a starter associated with its planetary gear comprising a torque limiting device carried out in accordance with the teachings of the invention.

On a représenté sur la figure un moteur électrique 10 appartenant à un démarreur de véhicule automobile (non représenté en détail) dont le rotor 12 est monté à rotation, autour d'un axe X-X, à l'intérieur d'un boítier ou stator 14, ces deux éléments 12 et 14 étant représentés schématiquement sur la figure.There is shown in the figure an electric motor 10 belonging to a motor vehicle starter (not shown in detail) whose rotor 12 is rotatably mounted, around an axis X-X, inside a housing or stator 14, these two elements 12 and 14 being represented schematically on the figure.

L'arbre de sortie 16 du moteur électrique 10, lié en rotation au rotor 12, fait saillie axialement au-delà de la face avant 18 du stator 14 et entraíne en rotation un pignon 20 qui est le pignon solaire d'un train épicycloïdal 22 agencé à l'intérieur du boítier 24 d'un réducteur 26 associé au moteur électrique 10.The output shaft 16 of the electric motor 10, linked at rotation to rotor 12, protrudes axially beyond the face before 18 of the stator 14 and rotates a pinion 20 which is the sun gear of a planetary gear train 22 arranged at inside the housing 24 of a reduction gear 26 associated with the motor electric 10.

Le boítier 24 est constitué pour l'essentiel par une jupe annulaire cylindrique 28, par un flasque latéral arrière 30 en forme de disque, percé en son centre 32 pour le passage du pignon solaire 20 et de l'arbre de sortie 16, et par un flasque latéral avant 34 percé en son centre 36 pour le passage de l'arbre de sortie 38 du réducteur 26, qui est destiné à entraíner en rotation le lanceur (non représenté) du démarreur par l'intermédiaire de cannelures 40.The housing 24 consists essentially of a cylindrical annular skirt 28, by a rear lateral flange 30 disc-shaped, pierced at its center 32 for the passage of sun gear 20 and output shaft 16, and by a flange front side 34 drilled in its center 36 for the passage of the output shaft 38 of the reducer 26, which is intended for rotate the starter launcher (not shown) by means of grooves 40.

La jupe annulaire cylindrique 28 du boítier 24 comporte, au voisinage de son extrémité axiale avant 42, un épaulement radial interne 44 contre lequel prend appui axialement la face externe 46 du flasque avant 34.The cylindrical annular skirt 28 of the housing 24 comprises, in the vicinity of its front axial end 42, a internal radial shoulder 44 against which bears axially the external face 46 of the front flange 34.

L'extrémité axiale arrière 48 de la jupe 28 comporte une portée 50 pour le centrage de la jupe 28 sur une partie de forme complémentaire de l'extrémité avant du stator 14 du moteur électrique 10.The rear axial end 48 of the skirt 28 comprises a range 50 for centering the skirt 28 on a part of complementary shape of the front end of the stator 14 of the motor electric 10.

La jupe 28 est fixée axialement au stator 14 par une série de tirants qui ne sont pas représentés sur la figure.The skirt 28 is fixed axially to the stator 14 by a series of tie rods which are not shown in the figure.

La jupe cylindrique annulaire 28 du boítier 24 comporte un alésage interne 52 dans lequel est introduit axialement le flasque avant 34, ce dernier étant immobilisé en rotation par rapport au boítier 24 par l'intermédiaire d'une patte d'orientation radiale externe 54 qui est reçue axialement dans une rainure axiale 56 formée dans l'alésage 52 et qui débouche dans l'extrémité axiale arrière ouverte 48 de la jupe 28.The annular cylindrical skirt 28 of the housing 24 comprises an internal bore 52 into which is axially introduced the front flange 34, the latter being immobilized in rotation by report to the housing 24 by means of an orientation tab external radial 54 which is received axially in a axial groove 56 formed in the bore 52 and which opens into the open rear axial end 48 of the skirt 28.

Le train épicycloïdal 22 comporte une couronne annulaire 58 dentée intérieurement 60 et dont la surface cylindrique externe 62 est montée à rotation à l'intérieur de l'alésage 52 de la jupe 28.The planetary gear 22 has a crown annular 58 internally toothed 60 and whose surface cylindrical outer 62 is rotatably mounted inside the bore 52 of the skirt 28.

Le train épicycloïdal 22 comporte aussi un porte-satellites 64 qui est lié en rotation à l'arbre de sortie 38 et qui est constitué par deux plaques 66 qui portent à rotation des satellites dentés 68 qui coopèrent avec la denture interne 60 de la couronne 58 et avec la denture externe du pignon solaire 20.The planetary gear 22 also includes a planet carrier 64 which is linked in rotation to the output shaft 38 and which consists of two plates 66 which rotate toothed satellites 68 which cooperate with the internal toothing 60 of the crown 58 and with the external toothing of the sun gear 20.

L'arbre de sortie 38 est monté à rotation dans le perçage 36 du flasque avant 34 avec interposition d'une douille à aiguilles 70, tandis que l'extrémité libre avant 72 du pignon solaire 20 est montée à rotation à l'intérieur de l'extrémité arrière 74 de l'arbre de sortie 38 avec interposition d'une série d'aiguilles 76.The output shaft 38 is rotatably mounted in the drilling 36 of the front flange 34 with the interposition of a socket needle 70, while the free front end 72 of the pinion solar 20 is rotatably mounted inside the end rear 74 of the output shaft 38 with the interposition of a series of needles 76.

Conformément aux enseignements de l'invention, la couronne dentée 58 est liée en rotation à la jupe 28 du boítier fixe 24 par l'intermédiaire d'un dispositif limiteur de couple à friction 80 dont la couronne 58 constitue l'un des composants.In accordance with the teachings of the invention, the ring gear 58 is linked in rotation to the skirt 28 of the housing fixed 24 by means of a torque limiting device to friction 80 of which the crown 58 constitutes one of the components.

A cet effet, la couronne 58 est réalisée dans un matériau, par exemple en matière plastique chargée, possédant de bonnes caractéristiques de frottement et de résistance à l'usure par friction.For this purpose, the crown 58 is produced in a material, for example of charged plastic, having good friction and wear resistance characteristics by friction.

La couronne dentée 58 est délimitée latéralement par deux faces latérales annulaires arrière 82 et avant 84 qui constituent deux surfaces annulaires de friction du dispositif limiteur de couple.The toothed crown 58 is delimited laterally by two annular side faces rear 82 and front 84 which constitute two annular friction surfaces of the device torque limiter.

La face latérale annulaire arrière 82 est en appui axial contre la face interne en vis-à-vis 86 du flasque arrière 30 du boítier 24.The rear annular lateral face 82 is in abutment axial against the internal face opposite 86 of the rear flange 30 of the housing 24.

Le flasque arrière 30 en forme de disque percé est agencé à l'intérieur de l'alésage 52 de la jupe 28 dans lequel il est immobilisé en rotation par l'intermédiaire d'une patte 88 d'orientation radiale externe qui est reçue dans la rainure 56 de la jupe 28. The rear flange 30 in the form of a pierced disc is arranged inside the bore 52 of the skirt 28 in which it is immobilized in rotation via a leg 88 of external radial orientation which is received in the groove 56 of the skirt 28.

Le flasque arrière 30 est retenu axialement à l'intérieur de la jupe 24 par l'intermédiaire d'un anneau 90 qui est monté dans une gorge radiale interne 92 de l'alésage 52 de la jupe 28.The rear flange 30 is retained axially at the interior of the skirt 24 by means of a ring 90 which is mounted in an internal radial groove 92 of the bore 52 of the skirt 28.

La face latérale annulaire avant 84 de la couronne 58 est en appui axial contre la face annulaire arrière 94 d'une rondelle d'appui 96 qui est montée à l'intérieur de l'alésage 52 et qui est immobilisée en rotation par rapport au boítier 24 par l'intermédiaire d'une patte 97 d'orientation radiale externe reçue dans la rainure axiale 56.The front annular lateral face 84 of the crown 58 is in axial abutment against the rear annular face 94 of a support washer 96 which is mounted inside the bore 52 and which is immobilized in rotation relative to the housing 24 by via a leg 97 of external radial orientation received in the axial groove 56.

Un organe élastique 98 réalisé sous la forme d'une rondelle tronconique est montée comprimée axialement entre la face annulaire interne 100 du flasque transversal avant 34 et la face annulaire avant 102 de la rondelle d'appui 96.An elastic member 98 produced in the form of a tapered washer is mounted axially compressed between the internal annular face 100 of the front transverse flange 34 and the front annular face 102 of the support washer 96.

La rondelle élastique 98 est centrée sur une portée cylindrique 104 du flasque transversal avant 34 qui s'étend radialement vers l'intérieur.The elastic washer 98 is centered on a span cylindrical 104 of the front transverse flange 34 which extends radially inward.

La rondelle 98 assure ainsi un effort de compression axiale de l'ensemble constitué par la couronne 58, le flasque transversal arrière 30 et la rondelle d'appui 96 contre la butée constituée par l'anneau de retenue 90.The washer 98 thus ensures a compression force axial of the assembly constituted by the crown 58, the flange rear transverse 30 and the support washer 96 against the stop constituted by the retaining ring 90.

La valeur de l'effort élastique axial appliqué par la rondelle 98 à cet ensemble détermine la valeur du couple maximal admissible exercé par le dispositif limiteur de couple 80 en association avec la valeur des coefficients de frottement existants entre les faces latérales 82 et 84 de la couronne 58 et les faces annulaires en vis-à-vis 86 et 94 du flasque arrière 30 et de la rondelle d'appui 96.The value of the axial elastic force applied by the washer 98 to this set determines the value of the maximum torque permissible exerted by the torque limiting device 80 in association with the value of the friction coefficients existing between the lateral faces 82 and 84 of the crown 58 and the annular faces facing 86 and 94 of the rear flange 30 and the support washer 96.

La conception selon l'invention est particulièrement compacte axialement en ce qu'elle ne fait appel à aucun disque ou rondelle de friction particulier, cette fonction étant assurée par l'intermédiaire de la couronne dentée 58 proprement dite.The design according to the invention is particularly axially compact in that it does not use any disc or particular friction washer, this function being ensured by means of the toothed crown 58 properly called.

L'assemblage des composants est particulièrement aisé et l'ensemble des composants du train épicycloïdal 22 et du dispositif limiteur de couple 80 peut être assemblé à l'intérieur du boítier 24 et retenu en place par l'intermédiaire de l'anneau 90, le sous-ensemble ainsi constitué pouvant être ensuite mis en place sur le stator 14 du moteur 10, le pignon solaire 20 associé en rotation à l'arbre de sortie 16 du moteur 10 pénétrant à l'intérieur du réducteur 26.The assembly of the components is particularly easy and all the components of the planetary gear train 22 and the torque limiting device 80 can be assembled to inside the housing 24 and retained in place through of the ring 90, the sub-assembly thus formed possibly being then placed on the stator 14 of the motor 10, the pinion solar 20 associated in rotation with the output shaft 16 of the motor 10 penetrating inside the reducer 26.

Lorsque le couple résistant appliqué à l'arbre de sortie 40 par le moteur thermique, à travers le lanceur, dépasse la valeur limite admissible par le dispositif limiteur de couple 80, par exemple en cas d'un choc torsionnel du moteur thermique, les forces d'adhérence de la couronne 58 sur le flasque arrière 30 et la rondelle d'appui 96 ne sont plus suffisantes pour assurer l'immobilisation en rotation de la couronne 58 par rapport au boítier 24 du réducteur 26 et cette dernière se met à tourner à l'intérieur du boítier et dissipe par frottement l'excès d'énergie mécanique.When the resistive torque applied to the shaft output 40 by the combustion engine, through the launcher, exceeds the limit value admissible by the torque limiting device 80, for example in the event of a torsional impact of the heat engine, the adhesion forces of the crown 58 on the rear flange 30 and the support washer 96 are no longer sufficient to ensure the immobilization in rotation of the crown 58 by relative to the housing 24 of the reducer 26 and the latter starts to turn inside the case and dissipate by friction excess mechanical energy.

Claims (15)

  1. Motor vehicle starter of the type comprising: an electric motor (10), the output shaft (16) of which drives a coaxial starter in rotation via a reduction gear (26) with an epicyclic gear train (20, 60, 68) comprising a cylindrical casing (24), within which the ring gear (58), having internal teeth (60), of the epicyclic train (22) is rotatably mounted, and of the type in which the ring gear (58) is coupled in rotation to the casing (24) via a friction-type torque-limiting device (80) interposed axially between the ring gear and a lateral flange of the casing (24), characterised in that the device is formed by at least one annular lateral friction face (82, 84) of the ring gear (58), which is loaded elastically into axial engagement against a reaction surface (86, 94) coupled in rotation to the casing (24).
  2. Starter according to Claim 1, characterised in that the reaction surface is the inner face (86) of a lateral flange (30) of the casing (24).
  3. Starter according to Claim 2, characterised in that the annular lateral rear face (82) of the ring gear (58) is in axial engagement against the inner face (86) of the annular rear flange (30) of the casing (24) , which is traversed by the free end of the shaft (16) of the motor (10), which drives in rotation the sun gear (20) of the epicyclic train (22).
  4. Starter according to Claim 3, characterised in that an elastic member (98) is mounted in axial compression between the annular lateral front face (84) of the ring gear (58) and the inner face (100) of the front flange (34) of the casing (24), which is traversed by the output shaft (38) of the reduction gear (26) coupled in rotation to the planet carrier (64) of the epicyclic train (22).
  5. Starter according to Claim 4, characterised in that the two annular lateral faces (82, 84) of the ring gear (58) constitute two friction surfaces of the torque-limiting device (80), and in that the annular lateral front face (84) of the ring gear (58) is in axial engagement against the annular rear face (94) of a bearing washer (96), which is coupled in rotation to the casing (24) and mounted for axial sliding movement relative to the latter, and the annular front face (102) of which constitutes an engagement surface for an elastic member (98).
  6. Starter according to either of Claims 4 and 5, characterised in that the elastic member (98) is a frustoconical elastic washer.
  7. Starter according to any of the preceding claims, characterised in that the internally toothed ring gear (58) is made of a material having good friction characteristics and good wear-resistance characteristics.
  8. Starter according to any of the preceding claims, characterised in that the casing (24) has a cylindrical annular skirt (28), the rear end of which is open, and in that the rear flange (30) is an annular rear disc pierced at its centre (32) to allow the shaft (16) of the motor (10) to pass through, retained axially within the casing (24) and immobilised against rotation with respect to the latter.
  9. Starter according to Claim 8, characterised in that the rear disc (30) is retained within the casing (24) by a thrust ring (90) mounted in an internal radial groove (92) in the skirt (28) of the casing (24).
  10. Starter according to either of Claims 8 and 9, characterised in that the front flange (34) of the casing (24) is an annular front disc, which is pierced at its centre (36) to allow the output shaft (38) of the reduction gear (26) to pass through and which bears axially against an internal radial shoulder (44) of the skirt (28) of the casing (24).
  11. Starter according to Claim 10, characterised in that the central hole (40) in the front disc (34) of the casing (24) receives a bearing (70) for guiding the output shaft (38) of the reduction gear (26) in rotation.
  12. Starter according to any of claims 8 to 11, characterised in that the rear end (48) of the skirt (28) comprises a bearing surface (50) for centring the casing (24) on the stator (14) of the electric motor (10).
  13. Starter according to any of Claims 10 to 12 taken in combination with Claim 6, characterised in that the inner face of the front disc (34) comprises a cylindrical bearing surface (104) for centring the elastic washer (98).
  14. Starter according to any of Claims 10 to 13, characterised in that the front disc (34) is immobilised against rotation with respect to the skirt (28) of the casing (24).
  15. Starter according to Claim 14 taken in combination with either of Claims 8 and 9 and with Claim 5, characterised in that the front disc (34) and the rear disc (30) each have a radial lug (54, 88), and in that the skirt (28) of the casing (24) has an axial groove (56), in which the said radial lugs are received for the purpose of immobilising these components (34, 30) against rotation with respect to the casing (24).
EP98100399A 1997-01-16 1998-01-12 Starter for motor vehicule with epicyclic reduction gear having a torque limiter Expired - Lifetime EP0854284B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9700512A FR2758370B1 (en) 1997-01-16 1997-01-16 STARTER OF A MOTOR VEHICLE WITH REDUCING GEAR WITH EPICYCLOIDAL TRAIN COMPRISING A TORQUE LIMITING DEVICE
FR9700512 1997-01-16

Publications (2)

Publication Number Publication Date
EP0854284A1 EP0854284A1 (en) 1998-07-22
EP0854284B1 true EP0854284B1 (en) 2003-03-26

Family

ID=9502742

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98100399A Expired - Lifetime EP0854284B1 (en) 1997-01-16 1998-01-12 Starter for motor vehicule with epicyclic reduction gear having a torque limiter

Country Status (6)

Country Link
US (1) US6076413A (en)
EP (1) EP0854284B1 (en)
CN (1) CN1118623C (en)
DE (1) DE69812446T2 (en)
ES (1) ES2196402T3 (en)
FR (1) FR2758370B1 (en)

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JP2000320438A (en) * 1999-05-12 2000-11-21 Mitsubishi Electric Corp Starter motor
FR2797109B1 (en) * 1999-07-30 2001-09-14 Valeo Equip Electr Moteur ROTATING ELECTRIC MACHINE AND STARTER HAVING A LOW AXIAL OPERATION OF THE ARMATURE SHAFT
FR2803345B1 (en) * 1999-12-30 2002-03-01 Valeo Equip Electr Moteur STARTER EQUIPPED WITH A SHOCK ABSORBER AND TORQUE LIMITER
WO2002021017A1 (en) * 2000-09-08 2002-03-14 Iowa State University Research Foundation, Inc. Self-actuating, traction-drive speed changer
JP4183937B2 (en) * 2001-10-31 2008-11-19 株式会社デンソー Starter
US6786265B1 (en) 2002-01-03 2004-09-07 Alex J. Kaye Laminating machine
JP2004060520A (en) * 2002-07-29 2004-02-26 Denso Corp Starter
JP4165362B2 (en) * 2003-10-08 2008-10-15 株式会社デンソー Starter
JP4179349B2 (en) * 2006-06-23 2008-11-12 トヨタ自動車株式会社 Ring gear, internal combustion engine starting rotational force transmission mechanism, and ring gear manufacturing method
US20080196544A1 (en) * 2007-02-20 2008-08-21 Denso Corporation Starter having excessive-torque-absorbing device
US20100105514A1 (en) * 2008-10-28 2010-04-29 Caterpillar Inc. Drive Assembly having ring gear friction clutch
DE102011088219A1 (en) * 2011-12-12 2013-06-13 Robert Bosch Gmbh Starter for internal combustion engine, has starter motor and driven starter pinion which is adjustable transverse to motor axis between disengaged position and engaged position with ring gear of internal combustion engine

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US3249187A (en) * 1964-02-26 1966-05-03 Gen Motors Corp One way positive clutch connected in parallel with overload release friction coupling
DE1956518A1 (en) * 1969-11-11 1971-05-19 Bosch Gmbh Robert Thrust drive for starting motors of internal combustion engines
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JPS61106974A (en) * 1984-10-30 1986-05-24 Nippon Denso Co Ltd Starter with planet gear reduction mechanism
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Also Published As

Publication number Publication date
FR2758370A1 (en) 1998-07-17
ES2196402T3 (en) 2003-12-16
FR2758370B1 (en) 1999-03-05
EP0854284A1 (en) 1998-07-22
DE69812446D1 (en) 2003-04-30
US6076413A (en) 2000-06-20
DE69812446T2 (en) 2003-11-27
CN1118623C (en) 2003-08-20
CN1190153A (en) 1998-08-12

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