EP1882113A2 - Heat engine comprising balance shafts which can be locked by a pin - Google Patents

Heat engine comprising balance shafts which can be locked by a pin

Info

Publication number
EP1882113A2
EP1882113A2 EP06794421A EP06794421A EP1882113A2 EP 1882113 A2 EP1882113 A2 EP 1882113A2 EP 06794421 A EP06794421 A EP 06794421A EP 06794421 A EP06794421 A EP 06794421A EP 1882113 A2 EP1882113 A2 EP 1882113A2
Authority
EP
European Patent Office
Prior art keywords
balancing
primary
shafts
pin
crankshaft
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.)
Withdrawn
Application number
EP06794421A
Other languages
German (de)
French (fr)
Inventor
Philippe Gauhtier
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.)
Renault SAS
Original Assignee
Renault 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 Renault SAS filed Critical Renault SAS
Publication of EP1882113A2 publication Critical patent/EP1882113A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/20—Shape of crankshafts or eccentric-shafts having regard to balancing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/22—Compensation of inertia forces
    • F16F15/26—Compensation of inertia forces of crankshaft systems using solid masses, other than the ordinary pistons, moving with the system, i.e. masses connected through a kinematic mechanism or gear system
    • F16F15/264—Rotating balancer shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/22—Compensation of inertia forces
    • F16F15/26—Compensation of inertia forces of crankshaft systems using solid masses, other than the ordinary pistons, moving with the system, i.e. masses connected through a kinematic mechanism or gear system

Definitions

  • the invention relates to a heat engine for a motor vehicle.
  • the invention relates more particularly to a heat engine, especially for a motor vehicle, of the type which comprises at least one engine block receiving in rotation a crankshaft and a cassette attached to the engine block which receives in rotation a pair of parallel balancing shafts.
  • primary and secondary which are unbalanced and which are rotated by the crankshaft, of the type in which a crankshaft rotationally integral ring meshes permanently with a first pinion carried by one end of the primary balancing shaft, and of the type in which a second pinion carried by the end of the primary balancer shaft meshes with a pinion carried by one end of the secondary balancer shaft.
  • the document EP-A1-1,445,509 describes and represents a motor in which the cassette comprises an intermediate shaft for driving the balance shafts, which shaft is itself driven by a camshaft of the motor via a toothed belt.
  • the end of the intermediate shaft comprises two asymmetrical flats forming polarizers which allow to put in position the intermediate shaft with the aid of a correct key before assembly.
  • the invention proposes an arrangement, in which the prior positioning of the shafts balancing is achieved by a reusable removable pin which is interposed between the two balancing shafts.
  • the invention proposes a motor of the type described above, characterized in that the ends of the primary and secondary balancing shafts are traversed by transverse holes which are intended, prior to the mounting of the balancing cassette on the motor block, to be aligned with each other in a predetermined position of the primary and secondary balancing shafts to receive a removable holding member.
  • the detachable holding element comprises means for interlocking on one end of one of the balancing shafts
  • the removable holding element consists of a pin
  • the pin comprises a first rectilinear strand, intended to pass through the bores, which is connected by means of a gripping loop to a second strand which comprises at least one curved portion complementary to the periphery of the end of the bead; a balancing shaft for forming the interlocking means, and the pin is made of an elastic material, to allow the pin to fit on said end,
  • the pin is made from a stainless steel wire so that it can be reused.
  • the invention also relates to a method for mounting a balancing cassette of the type described above, characterized in that it comprises at least:
  • FIG. 2 is a partial side view of the heat engine of FIG. 1;
  • FIG. 3 is a partial front detail view of the heat engine of FIG. 1.
  • the figures show in part a heat engine 1 0 intended in particular to equip a motor vehicle.
  • the motor 10 comprises at least one engine block (not shown) receiving in rotation a crankshaft
  • one end carries a hub 14 which is intended to receive a flywheel and a clutch mechanism (not shown) of the vehicle.
  • the motor 10 comprises a cassette 16 called “balancing" which is fixed to the engine block by means of screws 1 8 which are received in bores (not shown) of the engine block.
  • the cassette 16 is for example made by a foundry process and it comprises bearings 20, made by assembling two yokes 22 and 24, which receive in rotation a pair of primary parallel balancing shafts 26 and secondary 28.
  • Each primary or secondary shaft 28 is provided with associated unbalances 30, 32 which are intended to allow the vibrational balancing of the engine 1 0, and they are rotated by the crankshaft 12.
  • a ring gear 34 integral with rotation of the crankshaft 12 meshes permanently with a first pinion 36 which is carried by an end 38 of the primary balancer shaft 26, and a second pinion 40 carried by the end 38 of the primary balancing shaft 26 engages with a pinion 42 carried by an end 44 of the balancer shaft 28.
  • the ends 38, 44 of the primary balancing shafts 26 and secondary 28 are traversed by respective transverse bores 46, 48 which are intended, prior to the mounting of the cassette 1 6 on the engine block, to be aligned with each other to receive a removable holding member 50 which is intended for:
  • the removable holding member 50 comprises means 52 for fitting on one end of one of the balancing shafts. More particularly, the removable holding member 50 consists of a pin 50 which comprises a first rectilinear strand 54 which is intended to pass through the bores 46, 48 and which is connected by means of a gripping loop 56 to a second strand 58 which comprises at least one curved portion 62 complementary to the periphery of the end of a balancing shaft to form the interlocking means 52.
  • the second strand 58 has a curved portion 62 complementary to the periphery of the end 44 of the secondary balancing shaft 28, but this provision is not limiting of the invention and the portion 62 could cooperate with the end 38 of the balancing primary shaft 26 without changing the nature of the invention.
  • the hairpin In the preferred embodiment of the invention, the hairpin
  • the pin 50 is made of an elastic material, to allow the pin 50 to be interlocked on the end 44 of the secondary balancing shaft 28.
  • the pin 50 is made from a stainless steel wire so that it can be reused several times.
  • a balancing cassette 1 6 of the type described above can be mounted according to a mounting method which comprises at least a first step during which the pin constituting the holding element 50 is inserted into the transverse bores. 46, 48 of the ends 38, 44 of the primary shafts 26 and secondary 28.
  • the method also comprises a second step during which the ring gear 34 is secured in rotation with the crankshaft 12 in a determined angular position.
  • This setting may, by way of example and without limitation of the invention, be carried out directly by a setting of the crankshaft 12 of the engine in a position associated with a top dead center position or low dead point of one of the engine pistons.
  • the method also comprises a third step in which the balancing cassette 1 6 is fixed to the engine block.
  • the method comprises a fourth step during which the holding element 50 is removed from the transverse bores 46, 48 of the ends 38, 44 of the primary 26 and secondary 28 shafts.
  • the invention thus makes it possible in a simple and efficient manner to prepare a cassette 16 carrying balancing shafts 26, 28 before it is mounted.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
  • General Details Of Gearings (AREA)

Abstract

The invention relates to a heat engine (10) comprising at least one engine block which rotatably receives a crankshaft (12) and a cartridge (16) which is fixed to the engine block and which rotatably receives a pair of parallel balance shafts, namely a primary shaft (26) and a secondary shaft (28), which are rotated by the crankshaft (12). The invention also comprises a ring gear (34) which is rotationally connected to the crankshaft (12), permanently meshing with a first pinion (36) borne by one end (38) of the primary balance shaft (26). In addition, a second pinion (40), borne by the end (38) of the primary balance shaft (26), meshes with a pinion (42) borne by one end of the secondary balance shaft (28). The invention is characterised in that transverse holes (46, 48) extend through the ends (38, 44) of the primary (26) and secondary (28) balance shafts and are intended to be aligned with one another, before the cartridge (16) is mounted to the engine block, in order to receive a pin (50).

Description

"Moteur thermique comportant des arbres d'équilibrage susceptibles d'être immobilisés par une épingle" "Thermal engine with balancing shafts that can be immobilized by a pin"
L'invention concerne un moteur thermique pour un véhicule automobile. L'invention concerne plus particulièrement un moteur thermique, notamment pour un véhicule automobile, du type qui comporte au moins un bloc moteur recevant en rotation un vilebrequin et une cassette fixée au bloc moteur qui reçoit en rotation une paire d'arbres d'équilibrage parallèles primaire et secondaire qui sont munis de balourds et qui sont entraînés en rotation par le vilebrequin, du type dans lequel une couronne solidaire en rotation du vilebrequin engrène en permanence avec un premier pignon porté par une extrémité de l'arbre d'équilibrage primaire, et du type dans lequel un second pignon porté par l'extrémité de l'arbre d'équilibrage primaire engrène avec un pignon porté par une extrémité de l'arbre d'équilibrage secondaire.The invention relates to a heat engine for a motor vehicle. The invention relates more particularly to a heat engine, especially for a motor vehicle, of the type which comprises at least one engine block receiving in rotation a crankshaft and a cassette attached to the engine block which receives in rotation a pair of parallel balancing shafts. primary and secondary which are unbalanced and which are rotated by the crankshaft, of the type in which a crankshaft rotationally integral ring meshes permanently with a first pinion carried by one end of the primary balancing shaft, and of the type in which a second pinion carried by the end of the primary balancer shaft meshes with a pinion carried by one end of the secondary balancer shaft.
On connaît de nombreux exemples de moteurs thermiques dans lesquels les arbres d'équilibrages sont portés par une cassette qui est rapportée au bloc moteur.Numerous examples of heat engines are known in which the balancing shafts are carried by a cassette which is attached to the engine block.
Le document EP-A1 -1 .445.509 décrit et représente un moteur dans lequel la cassette comporte un arbre intermédiaire d'entraînement des arbres d'équilibrage, arbre qui est lui-même entraîné par un arbre à cames du moteur par l'intermédiaire d'une courroie crantée.The document EP-A1-1,445,509 describes and represents a motor in which the cassette comprises an intermediate shaft for driving the balance shafts, which shaft is itself driven by a camshaft of the motor via a toothed belt.
Pour assurer un positionnement angulaire correct de l'arbre intermédiaire par rapport à l'arbre à cames, l'extrémité de l'arbre intermédiaire comporte deux méplats dissymétriques formant détrompeurs qui permettent de mettre en position l'arbre intermédiaire à l'aide d'une clé conforme avant son montage.To ensure correct angular positioning of the intermediate shaft relative to the camshaft, the end of the intermediate shaft comprises two asymmetrical flats forming polarizers which allow to put in position the intermediate shaft with the aid of a correct key before assembly.
Cette solution n'est pas satisfaisante car elle cause de nombreuses difficultés à l'opérateur chargé du montage.This solution is not satisfactory because it causes many difficulties to the operator responsible for assembly.
Pour remédier à cet inconvénient, l'invention propose un agencement, dans lequel le positionnement préalable des arbres d'équilibrage est réalisé par une épingle amovible réutilisable qui est interposée entre les deux arbres d'équilibrage.To remedy this drawback, the invention proposes an arrangement, in which the prior positioning of the shafts balancing is achieved by a reusable removable pin which is interposed between the two balancing shafts.
Dans ce but, l'invention propose un moteur du type décrit précédemment, caractérisé en ce que les extrémités des arbres d'équilibrage primaire et secondaire sont traversées par des perçages transversaux qui sont destinés, préalablement au montage de la cassette d'équilibrage sur le bloc moteur, à être alignés l'un avec l'autre dans une position déterminée des arbres d'équilibrages primaire et secondaire pour recevoir un élément de maintien amovible.For this purpose, the invention proposes a motor of the type described above, characterized in that the ends of the primary and secondary balancing shafts are traversed by transverse holes which are intended, prior to the mounting of the balancing cassette on the motor block, to be aligned with each other in a predetermined position of the primary and secondary balancing shafts to receive a removable holding member.
Selon d'autres caractéristiques de l'invention :According to other features of the invention:
- l'élément de maintien amovible comporte des moyens d'emboîtement sur une extrémité d'un des arbres d'équilibrage,the detachable holding element comprises means for interlocking on one end of one of the balancing shafts,
- l'élément de maintien amovible est constitué d'une épingle,the removable holding element consists of a pin,
- l'épingle comporte un premier brin rectiligne, destiné à traverser les perçages, qui est réuni par l'intermédiaire d'une boucle de préhension à un second brin qui comporte au moins une portion incurvée complémentaire de la périphérie de l'extrémité d'un arbre d'équilibrage pour former les moyens d'emboîtement, et l'épingle est réalisée en un matériau élastique, pour permettre l'emboîtement de l'épingle sur ladite extrémité,the pin comprises a first rectilinear strand, intended to pass through the bores, which is connected by means of a gripping loop to a second strand which comprises at least one curved portion complementary to the periphery of the end of the bead; a balancing shaft for forming the interlocking means, and the pin is made of an elastic material, to allow the pin to fit on said end,
- l'épingle est réalisée à partir d'un fil d'acier inoxydable de manière à pouvoir être réutilisée. L'invention concerne aussi un procédé de montage d'une cassette d'équilibrage du typer décrit précédemment, caractérisé en ce qu'il comporte au moins :- The pin is made from a stainless steel wire so that it can be reused. The invention also relates to a method for mounting a balancing cassette of the type described above, characterized in that it comprises at least:
- une première étape au cours de laquelle on introduit l'élément de maintien dans les perçages transversaux des extrémités des arbres primaire et secondaire,a first step during which the holding element is introduced into the transverse bores of the ends of the primary and secondary shafts,
- une deuxième étape au cours de laquelle on cale la couronne solidaire en rotation du vilebrequin selon une position angulaire déterminée, - une troisième étape au cours de laquelle on fixe la cassette d'équilibrage sur le bloc moteur, eta second step during which the integral crown is locked in rotation of the crankshaft according to a determined angular position, a third step during which the balancing cassette is fixed on the engine block, and
- une quatrième étape au cours de laquelle on enlève l'élément de maintien des perçages transversaux des extrémités des arbres primaire et secondaire.a fourth step during which the element for holding the transverse bores of the ends of the primary and secondary shafts is removed.
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 partielle en perspective d'un moteur thermique selon l'invention ;Other features 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 accompanying drawings in which: - Figure 1 is a partial perspective view of a heat engine according to the invention;
- la figure 2 est une vue partielle de côté du moteur thermique de la figure 1 ;FIG. 2 is a partial side view of the heat engine of FIG. 1;
- la figure 3 est une vue partielle de détail de face du moteur thermique de la figure 1 .FIG. 3 is a partial front detail view of the heat engine of FIG. 1.
Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires.In the following description, like reference numerals designate like parts or having similar functions.
On a partiellement représenté sur les figures un moteur thermique 1 0 destiné notamment à équiper un véhicule automobile.The figures show in part a heat engine 1 0 intended in particular to equip a motor vehicle.
De manière connue, le moteur 10 comporte au moins un bloc moteur (non représenté) recevant en rotation un vilebrequinIn known manner, the motor 10 comprises at least one engine block (not shown) receiving in rotation a crankshaft
12 dont une extrémité porte un moyeu 14 qui est destiné à recevoir un volant moteur et un mécanisme d'embrayage (non représentés) du véhicule.12, one end carries a hub 14 which is intended to receive a flywheel and a clutch mechanism (not shown) of the vehicle.
De manière connue, le moteur 10 comporte une cassette 16 dite "d'équilibrage" qui est fixée au bloc moteur par l'intermédiaire de vis 1 8 qui sont reçues dans des perçages (non représentés) du bloc moteur.In known manner, the motor 10 comprises a cassette 16 called "balancing" which is fixed to the engine block by means of screws 1 8 which are received in bores (not shown) of the engine block.
La cassette 16 est par exemple réalisée par un procédé de fonderie et elle comporte des paliers 20, réalisés par assemblage de deux chapes 22 et 24, qui reçoivent en rotation une paire d'arbres d'équilibrages parallèles primaire 26 et secondaire 28. Chaque arbre primaire 26 ou secondaire 28 est muni de balourds associés 30, 32 qui sont destinés à permettre l'équilibrage vibratoire du moteur 1 0, et ils sont entraînés en rotation par le vilebrequin 12. A cet effet, une couronne dentée 34 solidaire en rotation du vilebrequin 12 engrène en permanence avec un premier pignon 36 qui est porté par une extrémité 38 de l'arbre 26 d'équilibrage primaire, et un second pignon 40 porté par l'extrémité 38 de l'arbre d'équilibrage primaire 26 engrène avec un pignon 42 porté par une extrémité 44 de l'arbre d'équilibrage 28.The cassette 16 is for example made by a foundry process and it comprises bearings 20, made by assembling two yokes 22 and 24, which receive in rotation a pair of primary parallel balancing shafts 26 and secondary 28. Each primary or secondary shaft 28 is provided with associated unbalances 30, 32 which are intended to allow the vibrational balancing of the engine 1 0, and they are rotated by the crankshaft 12. For this purpose, a ring gear 34 integral with rotation of the crankshaft 12 meshes permanently with a first pinion 36 which is carried by an end 38 of the primary balancer shaft 26, and a second pinion 40 carried by the end 38 of the primary balancing shaft 26 engages with a pinion 42 carried by an end 44 of the balancer shaft 28.
Conformément à l'invention, les extrémités 38, 44 des arbres d'équilibrage primaire 26 et secondaire 28 sont traversées par des perçages transversaux 46, 48 respectifs qui sont destinés, préalablement au montage de la cassette 1 6 sur le bloc moteur, à être alignés l'un avec l'autre pour recevoir un élément 50 de maintien amovible qui est destiné à :According to the invention, the ends 38, 44 of the primary balancing shafts 26 and secondary 28 are traversed by respective transverse bores 46, 48 which are intended, prior to the mounting of the cassette 1 6 on the engine block, to be aligned with each other to receive a removable holding member 50 which is intended for:
- lors du transport de la cassette 1 6 vers le site de montage du moteur 1 0, éviter les chocs de dentures des pignons 36, 40, et 42 des arbres d'équilibrage primaire 26 et secondaire 28,during the transport of the cassette 1 6 to the engine mounting site 1 0, avoid gear shocks of the gears 36, 40, and 42 of the primary balancing shafts 26 and secondary 28,
- prédéterminer la position angulaire relative de l'arbre d'équilibrage secondaire 28 par rapport à l'arbre d'équilibrage primaire 26, etpredetermine the relative angular position of the secondary balancing shaft 28 with respect to the primary balancing shaft 26, and
- prédéterminer la position angulaire absolue des arbres d'équilibrage primaire 26 et secondaire 28 par rapport à la cassette 16 d'équilibrage sans mettre en œuvre de moyens d'immobilisation par rapport à ladite cassette 1 6, afin de déterminer la position angulaire absolue des arbres primaire 26 et secondaire 28 par rapport à la couronne 34 du vilebrequin 12 lors du montage de la cassette 16 sur le bloc moteur.predetermine the absolute angular position of the primary balancing shafts 26 and secondary 28 relative to the balancing cassette 16 without implementing immobilization means with respect to said cassette 1 6, in order to determine the absolute angular position of the primary shaft 26 and secondary 28 relative to the ring 34 of the crankshaft 12 during assembly of the cassette 16 on the engine block.
Avantageusement, pour assurer son maintien durant le transport, l'élément 50 de maintien amovible comporte des moyens 52 d'emboîtement sur une extrémité d'un des arbres d'équilibrage. Plus particulièrement, l'élément 50 de maintien amovible est constitué d'une épingle 50 qui comporte un premier brin rectiligne 54 qui est destiné à traverser les perçages 46, 48 et qui est réuni par l'intermédiaire d'une boucle 56 de préhension à un second brin 58 qui comporte au moins une portion 62 incurvée complémentaire de la périphérie de l'extrémité d'un arbre d'équilibrage pour former les moyens 52 d'emboîtement.Advantageously, to ensure its maintenance during transport, the removable holding member 50 comprises means 52 for fitting on one end of one of the balancing shafts. More particularly, the removable holding member 50 consists of a pin 50 which comprises a first rectilinear strand 54 which is intended to pass through the bores 46, 48 and which is connected by means of a gripping loop 56 to a second strand 58 which comprises at least one curved portion 62 complementary to the periphery of the end of a balancing shaft to form the interlocking means 52.
Tel que représenté sur les figures, le second brin 58 comporte une portion 62 incurvée complémentaire de la périphérie de l'extrémité 44 de l'arbre 28 d'équilibrage secondaire, mais cette disposition n'est pas limitative de l'invention et la portion 62 pourrait coopérer avec l'extrémité 38 de l'arbre 26 primaire d'équilibrage sans changer la nature de l'invention. Dans le mode de réalisation préféré de l'invention, l'épingleAs shown in the figures, the second strand 58 has a curved portion 62 complementary to the periphery of the end 44 of the secondary balancing shaft 28, but this provision is not limiting of the invention and the portion 62 could cooperate with the end 38 of the balancing primary shaft 26 without changing the nature of the invention. In the preferred embodiment of the invention, the hairpin
50 est réalisée en un matériau élastique, pour permettre l'emboîtement de l'épingle 50 sur l'extrémité 44 de l'arbre secondaire d'équilibrage 28.50 is made of an elastic material, to allow the pin 50 to be interlocked on the end 44 of the secondary balancing shaft 28.
Avantageusement, l'épingle 50 est réalisée à partir d'un fil d'acier inoxydable de manière à pouvoir être réutilisée plusieurs fois.Advantageously, the pin 50 is made from a stainless steel wire so that it can be reused several times.
Pour assurer un positionnement angulaire correct des arbres primaire 26 et secondaire 28 par rapport à la couronne 34 du vilebrequin 12, il n'est pas nécessaire d'utiliser un quelconque système de repérage entre la couronne 34 du vilebrequin le premier pignon 36 de l'arbre 26 d'équilibrage primaire. En effet, il suffit que la position angulaire de la couronne dentée 34 solidaire en rotation du vilebrequin 12 soit déterminée avant le montage de la cassette 16. L'arbre secondai re d'équi librage 28 est quant à lui natu rellement mis en position angu lai re de manière correcte par rapport à l'arbre pri mai re d'équi librage 26, puisqu'i l engrène avec ce dernier en permanence et qu'i l est préalablement mis en position par rapport à l'arbre primaire d'équilibrage 26 lors du montage de la cassette 16.To ensure correct angular positioning of the primary shafts 26 and secondary 28 relative to the ring 34 of the crankshaft 12, it is not necessary to use any registration system between the ring 34 of the crankshaft the first pinion 36 of the primary balancing shaft 26. Indeed, it is sufficient that the angular position of the ring gear 34 integral in rotation with the crankshaft 12 is determined before the mounting of the cassette 16. The second shaft balancing equilibrium 28 is for its part natu rally placed in position it is correctly aligned with the main shaft 26, since it meshes with the latter permanently and is previously position relative to the balancing primary shaft 26 during assembly of the cassette 16.
Dans cette configuration, une cassette 1 6 d'équilibrage du type décrit précédemment peut être montée selon un procédé de montage qui comporte au moins une première étape au cours de laquelle on introduit l'épingle constituant l'élément de maintien 50 dans les perçages transversaux 46, 48 des extrémités 38, 44 des arbres primaire 26 et secondaire 28.In this configuration, a balancing cassette 1 6 of the type described above can be mounted according to a mounting method which comprises at least a first step during which the pin constituting the holding element 50 is inserted into the transverse bores. 46, 48 of the ends 38, 44 of the primary shafts 26 and secondary 28.
Le procédé comporte aussi une deuxième étape au cours de laquelle on cale la couronne 34 solidaire en rotation du vilebrequin 12 selon une position angulaire déterminée. Ce calage peut, à titre d'exemple et de manière non limitative de l'invention, être réalisé directement par un calage du vilebrequin 12 du moteur selon une position associée à une position de point mort haut ou de point mort bas d'un des pistons du moteur.The method also comprises a second step during which the ring gear 34 is secured in rotation with the crankshaft 12 in a determined angular position. This setting may, by way of example and without limitation of the invention, be carried out directly by a setting of the crankshaft 12 of the engine in a position associated with a top dead center position or low dead point of one of the engine pistons.
Le procédé comporte aussi une troisième étape au cours de laquelle on fixe la cassette 1 6 d'équilibrage sur le bloc moteur.The method also comprises a third step in which the balancing cassette 1 6 is fixed to the engine block.
Enfin, le procédé comporte une quatrième étape au cours de laquelle on enlève l'élément de maintien 50 des perçages transversaux 46, 48 des extrémités 38, 44 des arbres primaire 26 et secondaire 28.Finally, the method comprises a fourth step during which the holding element 50 is removed from the transverse bores 46, 48 of the ends 38, 44 of the primary 26 and secondary 28 shafts.
L'invention permet donc de manière simple et efficace de préparer une cassette 16 porteuse d'arbres 26, 28 d'équilibrage avant son montage. The invention thus makes it possible in a simple and efficient manner to prepare a cassette 16 carrying balancing shafts 26, 28 before it is mounted.

Claims

REVENDICATIONS
1 . Moteur thermique (1 0), notamment pour un véhicule automobile, du type qui comporte au moins un bloc moteur recevant en rotation un vilebrequin (12) et une cassette d'équilibrage (1 6) fixée au bloc moteur qui reçoit en rotation une paire d'arbres d'équilibrage parallèles primaire (26) et secondaire (28) qui sont munis de balourds (30, 32) et qui sont entraînés en rotation par le vilebrequin (12), du type dans lequel une couronne (34) solidaire en rotation du vilebrequin (12) engrène en permanence avec un premier pignon (36) porté par une extrémité (38) de l'arbre (26) d'équilibrage primaire, et du type dans lequel un second pignon (40) porté par l'extrémité (38) de l'arbre d'équilibrage primaire (26) engrène avec un pignon (42) porté par une extrémité de l'arbre d'équilibrage secondaire (28), caractérisé en ce que les extrémités (38, 44) des arbres d'équilibrage primaire (26) et secondaire (28) sont traversées par des perçages transversaux (46, 48) qui sont destinés, préalablement au montage de la cassette (1 6) d'équilibrage sur le bloc moteur, à être alignés l'un avec l'autre dans une position déterminée des arbres d'équilibrages primaire et secondaire pour recevoir un élément de maintien amovible (50).1. A heat engine (1 0), in particular for a motor vehicle, of the type which comprises at least one engine block receiving in rotation a crankshaft (12) and a balancing cassette (1 6) fixed to the engine block which receives in rotation a pair primary parallel balancing shafts (26) and secondary (28) which are provided with imbalances (30, 32) and which are rotated by the crankshaft (12), of the type in which a ring (34) integral with rotation of the crankshaft (12) meshes permanently with a first gear (36) carried by one end (38) of the primary balancing shaft (26), and of the type in which a second gear (40) carried by the end (38) of the primary balancer shaft (26) meshes with a pinion (42) carried by one end of the secondary balancer shaft (28), characterized in that the ends (38, 44) of the primary (26) and secondary balancing shafts (28) are traversed by transverse bores (46, 48) which are t intended, prior to mounting the cassette (1 6) balancing on the engine block, to be aligned with each other in a predetermined position of the primary and secondary balancing shafts to receive a removable holding member (50).
2. Moteur thermique (1 0) selon la revendication 1 , caractérisé en ce que l'élément de maintien amovible (50) comporte des moyens (52) d'emboîtement sur une extrémité d'un des arbres d'équilibrage.2. heat engine (1 0) according to claim 1, characterized in that the removable holding member (50) comprises means (52) for fitting on one end of one of the balancing shafts.
3. Moteur thermique selon l'une des revendications 1 ou 2, caractérisé en ce que l'élément de maintien amovible (50) est constitué d'une épingle.3. Heat engine according to one of claims 1 or 2, characterized in that the removable holding member (50) consists of a pin.
4. Moteur thermique (10) selon la revendication précédente caractérisé en ce que l'épingle (50) comporte un premier brin rectiligne (54), destiné à traverser les perçages (46, 48) , qui est réuni par l'intermédiaire d'une boucle (56) de préhension à un second brin (58) qui comporte au moins une portion (62) incurvée complémentaire de la périphérie de l'extrémité (44) d'un arbre (28) d'équilibrage pour former les moyens (52) d'emboîtement, et en ce que l'épingle (50) est réalisée en un matériau élastique, pour permettre l'emboîtement de l'épingle (50) sur ladite extrémité (44). 4. heat engine (10) according to the preceding claim characterized in that the pin (50) comprises a first rectilinear strand (54) for passing through the bores (46, 48), which is joined via a second strand (56) gripping loop (56) having at least one curved portion (62) complementary to the periphery of the end (44) of a shaft (28) for forming the interlocking means (52), and in that the pin (50) is made of an elastic material, to allow the pin (50) to fit on said end ( 44).
5. Moteur thermique (1 0) selon la revendication précédente, caractérisé en ce que l'épingle (50) est réalisée à partir d'un fil d'acier inoxydable de manière à pouvoir être réutilisée.5. heat engine (1 0) according to the preceding claim, characterized in that the pin (50) is made from a stainless steel wire so as to be reused.
6. Procédé de montage d'une cassette (1 6) d'équilibrage selon les revendications 1 à 5, caractérisé en ce qu'il comporte au moins :6. A method of mounting a balancing cassette (1 6) according to claims 1 to 5, characterized in that it comprises at least:
- une première étape au cours de laquelle on introduit l'élément de maintien (50) dans les perçages transversaux (46, 48) des extrémités (38, 44) des arbres primaire (26) et secondaire (28) ,a first step during which the holding element (50) is inserted into the transverse bores (46, 48) of the ends (38, 44) of the primary (26) and secondary (28) shafts,
- une deuxième étape au cours de laquelle on cale la couronne (34) solidaire en rotation du vilebrequin selon une position angulaire déterminée,a second step during which the ring gear (34) integral with the crankshaft is rotated in a determined angular position,
- une troisième étape au cours de laquelle on fixe la cassette (16) d'équilibrage sur le bloc moteur, eta third step during which the balancing cassette (16) is fixed on the engine block, and
- une quatrième étape au cours de laquelle on enlève l'élément de maintien (50) des perçages transversaux (46, 48) des extrémités (38, 44) des arbres primaire (26) et secondaire (28). a fourth step during which the holding element (50) is removed from the transverse bores (46, 48) of the ends (38, 44) of the primary (26) and secondary (28) shafts.
EP06794421A 2005-05-12 2006-05-12 Heat engine comprising balance shafts which can be locked by a pin Withdrawn EP1882113A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0504769A FR2885661B1 (en) 2005-05-12 2005-05-12 THERMAL MOTOR COMPRISING BALANCING SHAFTS THAT CAN BE IMMOBILIZED BY A PIN
PCT/FR2006/050436 WO2007003812A2 (en) 2005-05-12 2006-05-12 Heat engine comprising balance shafts which can be locked by a pin

Publications (1)

Publication Number Publication Date
EP1882113A2 true EP1882113A2 (en) 2008-01-30

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EP06794421A Withdrawn EP1882113A2 (en) 2005-05-12 2006-05-12 Heat engine comprising balance shafts which can be locked by a pin

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US (1) US7921825B2 (en)
EP (1) EP1882113A2 (en)
JP (1) JP4744598B2 (en)
KR (1) KR101203305B1 (en)
CN (1) CN101171439B (en)
FR (1) FR2885661B1 (en)
RU (1) RU2400656C2 (en)
WO (1) WO2007003812A2 (en)

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Also Published As

Publication number Publication date
US20090173308A1 (en) 2009-07-09
CN101171439B (en) 2010-09-22
KR101203305B1 (en) 2012-11-20
RU2400656C2 (en) 2010-09-27
WO2007003812A2 (en) 2007-01-11
RU2007146148A (en) 2009-06-20
KR20080013877A (en) 2008-02-13
JP2008540957A (en) 2008-11-20
US7921825B2 (en) 2011-04-12
JP4744598B2 (en) 2011-08-10
FR2885661A1 (en) 2006-11-17
FR2885661B1 (en) 2007-08-03
CN101171439A (en) 2008-04-30
WO2007003812A3 (en) 2007-03-08

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