WO2008068165A2 - Method for adapting a divisible cap piece on a cylinder housing and adapted divisible cap piece - Google Patents

Method for adapting a divisible cap piece on a cylinder housing and adapted divisible cap piece Download PDF

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Publication number
WO2008068165A2
WO2008068165A2 PCT/EP2007/062866 EP2007062866W WO2008068165A2 WO 2008068165 A2 WO2008068165 A2 WO 2008068165A2 EP 2007062866 W EP2007062866 W EP 2007062866W WO 2008068165 A2 WO2008068165 A2 WO 2008068165A2
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WO
WIPO (PCT)
Prior art keywords
bearing
bearing cap
flanks
breakable
machining
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Application number
PCT/EP2007/062866
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French (fr)
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WO2008068165A3 (en
Inventor
Xavier Frere
Original Assignee
Renault S.A.S.
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Publication date
Application filed by Renault S.A.S. filed Critical Renault S.A.S.
Publication of WO2008068165A2 publication Critical patent/WO2008068165A2/en
Publication of WO2008068165A3 publication Critical patent/WO2008068165A3/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
    • F16C9/02—Crankshaft bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0043—Arrangements of mechanical drive elements
    • F02F7/0053—Crankshaft bearings fitted in the crankcase

Definitions

  • the present invention relates to a breakable bearing cap having a boss on its flanks for its machining after fracturing, and a method of fitting a breakable bearing cap to a crankcase for machining the flanks of the breakable bearing cap after fracturing.
  • bearing caps attach the crankshaft to the crankcase.
  • a bearing cap is in the form of a half-collar whose half-circular orifice makes it possible to introduce the crankshaft.
  • the bearing cap is then secured with screws on a crankcase bearing to hold the crankshaft.
  • the bearing caps being very stressed on a motor, and in particular on the V-shaped motors, they are fixed with four "main” fixing screws, collinear with each other, and with two "lateral” fixing screws. , perpendicular to the main screws.
  • the lateral fixing screws are commonly called “cross bolting".
  • centering feet are used to ensure proper longitudinal positioning of the crankshaft in the holes of the bearing caps.
  • breakable bearing caps are cast-iron directly on the crankcase. They are "fractured” (so-called “breaking” operation) to insert the crankshaft, then re-attached to the bearings of the crankcase using fixing screws, bringing into contact the fractured surfaces of the breakable bearing cap and of the landing.
  • the adhesion of the breakable bearing cap to the crankcase bearing is thus enhanced because the surface condition of the fractured surface of the bearing cap matches exactly with the surface condition of the fractured bearing surface.
  • the breakable bearing caps are fixed only by two main fixing screws.
  • the crankshaft In V-engines, such as V6 engines, the crankshaft is very bulky. To reduce its dimensions, the sides of the arms and counterweights of the Crankshaft are close to the flanks of the bearing caps and bearings of the crankcase. The distance between these can go up to the order of a few tenths of a millimeter minimum. Also, to ensure this minimum operating clearance, the flanks of the crankshaft, the sides of the bearings of the crankcase and the flanks of the bearing caps are machined.
  • An object of the present invention is to overcome one or more disadvantages of the prior art, in particular by providing a breakable bearing cap which allows machining of its flanks after breaking, without impact on the fractured surfaces.
  • This object is accomplished by a breakable bearing cap characterized in that it has a boss on a portion of each of its flanks, such that the lines of intersection between the fractured surfaces and the flanks are set back from the part protruding boss.
  • the contour of the boss is close to the contour of the flank of the bearing cap.
  • Another object of the present invention is a method of manufacturing by casting a crankcase for making this breakable bearing cap.
  • the method of manufacturing a crank case having a bearing and a breakable bearing cap is characterized in that the breakable bearing cap has a boss on its flanks, and that a groove is present on the joint plane of the break bearing cap.
  • Another object of the present invention is a method for adapting a breakable bearing cap to a crankcase.
  • FIG. 1 shows a machining of the flanks of a "standard" bearing according to the prior art.
  • FIG. 2 shows the inaccessibility of the flanks during the machining of a breakable bearing cap and a bearing according to the prior art.
  • Figure 3 shows a schematic of a breakable bearing cap having a boss according to the present invention.
  • Figure 4 shows a view of a fractured surface and boss on a breakable bearing cap according to the present invention.
  • Figure 5 shows a partial schematic view of a cylinder block according to the present invention.
  • FIGS. 1 to 5 In order to minimize the distance between, on the one hand, the flanks of the bearing caps and the bearing flanks of the crankcase, and, on the other hand, the flanks of the crankshaft, a machining is carried out on the flanks with the aid of a milling cutter.
  • Figure 1 shows schematically this "standard” machining step according to the prior art.
  • a crankcase (13) has a bearing (14) on which a bearing cap (not shown) can be attached.
  • the bearing flanks (12) of the crankcase are machined with a milling cutter (11) located around its hub (10). In this configuration, machining of the entire bearing flank (12) is possible by the cutter, because it can be introduced and brought into contact with the entire bearing flank (12).
  • FIG. 2 shows the machining in the case of the use of a breakable bearing cap (40) according to the prior art.
  • the machining of the bearing flanks (12) and the flanks of the bearing cap (20) is impossible after the fracture of the bearing cap (40), since the machining would modify the surface condition of the fractured zone, particularly at level of the junction line between the fractured surface and the flanks, and therefore would not allow a good holding of the bearing cap on the bearing. Machining can only be done before fracturing. This is why the bearing cap (40) is present on the bearing (14) in FIG. 2.
  • the bearing cap (40) creates, with the bearing (14), a circular orifice (30) allowing the introduction part of a crankshaft.
  • the diameter of the cutter (11) to be used for machining the flanks of the bearing cap (20) and the flanks of the bearing (12) is too large, and the cutter can not be inserted against the flanks for machining. Machining is therefore impossible according to the prior art.
  • Figure 3 shows a possible embodiment breakable breakable bearing cap according to the present invention, allowing the machining of its flanks after the fracture operation.
  • the general shape of the breakable bearing cap (1) of the present invention resembles the general shape of a cap of breakable bearing according to the prior art. It has flanks having a shape close to a U, with straight edges and parallel to each other, and a base connecting the two branches of the perpendicular U with the edges.
  • the two fractured surfaces (4) are located at the ends of the two parallel edges, the opposite side to the base connecting the two edges.
  • the two fractured surfaces (4) are machined so as to be able to introduce fastening screws through orifices (5).
  • the bearing face (15) is the face located on the opposite side to the fractured surfaces.
  • the bearing face (15) is also machined during the process of adaptation of the crankshaft on the cylinder block to allow the introduction of two fastening screws in the branches of the U.
  • the bearing cap has a boss (2) on both flanks.
  • the contours of the boss (2) generally follow the contours of the bearing cap (1).
  • the boss (2) is present on almost the entire two flanks of the bearing cap (1). With this boss (2), the junction lines (L) between the flanks and the fractured surfaces (4) are set back relative to the projecting portion of the boss.
  • Figure 4 shows an approximate view of the junction between the boss (2) and a fractured surface (4).
  • the machining of the flanks of the bearing cap is to press the cutter on the projecting portion of the boss. It is then possible to machine the flanks of the bearing cap after breaking, because the machined area is not in direct contact with the fractured surface, and in particular with the junction line (L).
  • the breakable bearing cap according to the present invention is therefore made in the casting with the crankcase.
  • Figure 5 shows a cylinder block (13) on which the bearing cap (1) according to the present invention has not yet been fractured.
  • the casting step of the cylinder block takes into account the presence of the boss (2) on the flanks of the cap.
  • a groove (6) is present on the joint plane of the break in order to indent the flanks to be machined of the fracturable surface.
  • crankcase shaft line receiving the crankshaft is achieved.
  • This pre-machining consists in using a boring tool to approach the diameter of the shaft line,
  • the machining makes it possible to modify the surface state of the flanks of the bearing cap, without altering the fractured surface, since it is not in direct contact with the machined zone, - a fixing of the cap bearing on the crankcase bearings, using the two main fastening screws,
  • each cap is associated with a single bearing of the cylinder block. There is a "match" between each hat and each tier. It should be obvious to those skilled in the art that the present invention allows embodiments in many other specific forms without departing from the scope of the invention as claimed. Therefore, the present embodiment should be considered by way of illustration, but may be modified within the scope defined by the scope of the appended claims, and the invention should not be limited to the details given above.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Closures For Containers (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

A divisible cap piece (1) for fixing of a crankshaft on a cylinder housing, characterized in that it comprises a hump (2) on its flanks allowing to retract the fractured surface (4) in relation to the protrusion of the hump. According to the present invention, an adaptation method for the cap piece (1) permits operation of the cap piece after breakage and without modifying the fractured surface (4).

Description

Procédé d'adaptation d'un chapeau de palier sécable sur un carter cylindres et chapeau de palier sécable adapté Method of fitting a breakable bearing cap to a crankcase and suitable breakable bearing cap
La présente invention concerne un chapeau de palier sécable possédant un bossage sur ses flancs pour son usinage après fracturation, et un procédé d'adaptation d'un chapeau de palier sécable sur un carter cylindres, permettant un usinage des flancs du chapeau de palier sécable après fracturation.The present invention relates to a breakable bearing cap having a boss on its flanks for its machining after fracturing, and a method of fitting a breakable bearing cap to a crankcase for machining the flanks of the breakable bearing cap after fracturing.
Dans les moteurs à combustion interne, des chapeaux de paliers fixent le vilebrequin sur le carter cylindres. Généralement, un chapeau de palier se présente sous la forme d'un demi-collier dont l'orifice demi-circulaire permet d'introduire le vilebrequin. Le chapeau de palier est ensuite fixé avec des vis sur un palier du carter cylindres pour maintenir le vilebrequin. Les chapeaux de paliers étant très sollicités sur un moteur, et en particulier sur les moteurs en V, ils sont fixés avec quatre vis de fixation, dites « principales », colinéaires entre elles, ainsi que par deux vis de fixation, dites « latérales », perpendiculaires aux vis principales. Les vis de fixation latérales sont couramment appelées « cross bolting ». De plus, des pieds de centrage sont utilisés pour assurer un bon positionnement longitudinal du vilebrequin dans les orifices des chapeaux de palier.In internal combustion engines, bearing caps attach the crankshaft to the crankcase. Generally, a bearing cap is in the form of a half-collar whose half-circular orifice makes it possible to introduce the crankshaft. The bearing cap is then secured with screws on a crankcase bearing to hold the crankshaft. The bearing caps being very stressed on a motor, and in particular on the V-shaped motors, they are fixed with four "main" fixing screws, collinear with each other, and with two "lateral" fixing screws. , perpendicular to the main screws. The lateral fixing screws are commonly called "cross bolting". In addition, centering feet are used to ensure proper longitudinal positioning of the crankshaft in the holes of the bearing caps.
Une alternative à ce montage de chapeaux de palier, afin d'éliminer à la fois deux des quatre vis de fixation principales, les deux vis de fixations latérales, et les pieds de centrage, est d'utiliser des chapeaux de paliers sécables. Les chapeaux de palier sécables sont conçus en fonderie directement sur le carter cylindres. Ils sont « fracturés » (opération dite de « cassage ») pour insérer le vilebrequin, puis re-fixés sur les paliers du carter cylindres à l'aide de vis de fixation, en mettant en contact les surfaces fracturées du chapeau de palier sécable et du palier. L'adhérence du chapeau de palier sécable sur le palier du carter cylindres est donc renforcée, car l'état de surface de la surface fracturée du chapeau de palier concorde exactement avec l'état de surface de la surface fracturée du palier. Ainsi, les chapeaux de palier sécables ne sont fixés que par deux vis de fixation principales.An alternative to this mounting of bearing caps, in order to eliminate both of the four main fastening screws, the two side fastening screws, and the centering feet, is to use breakable bearing caps. The breakable bearing caps are cast-iron directly on the crankcase. They are "fractured" (so-called "breaking" operation) to insert the crankshaft, then re-attached to the bearings of the crankcase using fixing screws, bringing into contact the fractured surfaces of the breakable bearing cap and of the landing. The adhesion of the breakable bearing cap to the crankcase bearing is thus enhanced because the surface condition of the fractured surface of the bearing cap matches exactly with the surface condition of the fractured bearing surface. Thus, the breakable bearing caps are fixed only by two main fixing screws.
Dans les moteurs en V, tel que les moteurs V6, le vilebrequin est très encombrant. Pour réduire ses dimensions, les flancs des bras et des contrepoids du vilebrequin sont proches des flancs des chapeaux de palier et des paliers du carter cylindres. La distance entre ceux-ci pouvant aller jusqu'à de l'ordre de quelques dixièmes de millimètres au minimum. Aussi, pour assurer ce jeu de fonctionnement minimal, les flancs du vilebrequin, les flancs des paliers du carter cylindres et les flancs des chapeaux de palier sont usinés.In V-engines, such as V6 engines, the crankshaft is very bulky. To reduce its dimensions, the sides of the arms and counterweights of the Crankshaft are close to the flanks of the bearing caps and bearings of the crankcase. The distance between these can go up to the order of a few tenths of a millimeter minimum. Also, to ensure this minimum operating clearance, the flanks of the crankshaft, the sides of the bearings of the crankcase and the flanks of the bearing caps are machined.
Dans le cas de l'utilisation de chapeaux de paliers « standards », l'usinage des flancs de palier est réalisé indépendamment de l'usinage des flancs des chapeaux de palier, car ceux - ci peuvent être facilement montés et démontés du carter cylindres. Par contre, il n'existe pas, dans l'état de l'art antérieur, de méthode pour usiner les chapeaux de palier sécables et les flancs de palier associés avec la même précision que pour les chapeaux de paliers standards. En effet, avant le cassage, l'usinage des flancs du palier est impossible, par manque d'accessibilité des flancs avec la fraise et son moyeu. La fraise n'a en effet pas la possibilité d'accéder aux flancs du palier, car la présence du chapeau de palier gène son insertion. De même, il n'est pas possible d'usiner le flanc du chapeau de palier sécable à la suite du cassage, car les surfaces fracturées doivent rester intactes afin d'assurer le bon maintien du chapeau sur le palier. L'usinage étant réalisé sur les flancs, l'état de surface des zones à l'intersection entre les flancs et les surfaces fracturées peut être modifié. Ce changement d'état de surface perturbe alors le maintien du chapeau de palier sur le palier.In the case of the use of "standard" bearing caps, the machining of the bearing flanks is performed independently of the machining of the flanks of the bearing caps, as these can be easily mounted and removed from the crankcase. In contrast, there is no prior art method for machining the breakable bearing caps and the associated bearing flanks with the same precision as for the standard bearing caps. Indeed, before breaking, the machining of the flanks of the bearing is impossible, due to lack of accessibility of the flanks with the cutter and its hub. The strawberry does not have the possibility to access the flanks of the bearing, because the presence of the bearing cap gene insertion. Similarly, it is not possible to machine the flank of the breakable bearing cap after breaking, because the fractured surfaces must remain intact to ensure the proper maintenance of the cap on the bearing. Machining being performed on the flanks, the surface state of the areas at the intersection between the flanks and the fractured surfaces can be changed. This change in surface condition then disturbs the maintenance of the bearing cap on the bearing.
Un objet de la présente invention est de pallier à un ou plusieurs inconvénients de l'art antérieur, notamment en proposant un chapeau de palier sécable qui permet d'assurer l'usinage de ses flancs après le cassage, sans impact sur les surfaces fracturées. Cet objet est accompli par un chapeau de palier sécable caractérisé en ce qu'il possède un bossage sur une partie de chacun de ses flancs, telles que les lignes d'intersection entre les surfaces fracturées et les flancs sont en retrait par rapport à la partie saillante du bossage.An object of the present invention is to overcome one or more disadvantages of the prior art, in particular by providing a breakable bearing cap which allows machining of its flanks after breaking, without impact on the fractured surfaces. This object is accomplished by a breakable bearing cap characterized in that it has a boss on a portion of each of its flanks, such that the lines of intersection between the fractured surfaces and the flanks are set back from the part protruding boss.
Selon une particularité de l'invention, le contour du bossage est proche du contour du flanc du chapeau de palier.According to a feature of the invention, the contour of the boss is close to the contour of the flank of the bearing cap.
Un autre objet de la présente invention est un procédé de fabrication par fonderie d'un carter cylindres permettant de réaliser ce chapeau de palier sécable. Le procédé de fabrication d'un carter cylindres possédant un palier et un chapeau de palier sécable est caractérisé en ce que le chapeau de palier sécable possède un bossage sur ses flancs, et qu'une rainure est présente sur le plan de joint de la cassure du chapeau de palier. Un autre objet de la présente invention est un procédé permettant d'adapter un chapeau de palier sécable sur un carter cylindres.Another object of the present invention is a method of manufacturing by casting a crankcase for making this breakable bearing cap. The method of manufacturing a crank case having a bearing and a breakable bearing cap is characterized in that the breakable bearing cap has a boss on its flanks, and that a groove is present on the joint plane of the break bearing cap. Another object of the present invention is a method for adapting a breakable bearing cap to a crankcase.
Le procédé permettant d'adapter, sur un carter cylindres, un chapeau de palier sécable possédant un bossage sur une partie de ses flancs dont les contours suivent sensiblement les contours du chapeau de palier, et telles que les lignes d'intersection entre les surfaces fracturées et les flancs du chapeau de palier sont en retrait par rapport à la partie saillante du bossage est caractérisé en ce qu'il possède les étapes suivantes :The method of adapting, on a crankcase, a breakable bearing cap having a boss on a portion of its flanks whose contours substantially follow the contours of the bearing cap, and such as the lines of intersection between the fractured surfaces and the flanks of the bearing cap are set back with respect to the projecting portion of the boss and characterized in that it has the following steps:
- une étape de pré - usinage de la ligne d'arbre du carter cylindres recevant le vilebrequin, - une étape d'usinage de la face d'appui et des trous de fixation du chapeau de palier sécable,a pre-machining step of the crankcase shaft line receiving the crankshaft; a step of machining the bearing face and the fixing holes of the breakable bearing cap;
- une étape de cassage du chapeau de palier sécable,a step of breaking the breakable bearing cap,
- une étape d'usinage des flancs de paliers du carter cylindres,a step of machining the bearing flanks of the crankcase,
- une étape d'usinage de la partie saillante du bossage du chapeau de palier, - une étape de fixation du chapeau de palier sur un palier du carter cylindresa step of machining the protruding portion of the boss of the bearing cap; a step of fixing the bearing cap on a bearing of the crankcase;
- une étape d'usinage de finition de la ligne d'arbre du carter cylindres. 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 présente un usinage des flancs d'un palier « standard » selon l'art antérieur.- A finishing machining step of the shaft line of the cylinder block. 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: FIG. 1 shows a machining of the flanks of a "standard" bearing according to the prior art.
La figure 2 présente l' inaccessibilité des flancs lors de l'usinage d'un chapeau de palier sécable et d'un palier selon l'art antérieur.FIG. 2 shows the inaccessibility of the flanks during the machining of a breakable bearing cap and a bearing according to the prior art.
La figure 3 présente un schéma d'un chapeau de palier sécable possédant un bossage selon la présente invention.Figure 3 shows a schematic of a breakable bearing cap having a boss according to the present invention.
La figure 4 présente une vue d'une surface fracturée et d'un bossage sur un chapeau de palier sécable selon la présente invention. La figure 5 présente une vue schématique partielle d'un carter cylindres selon la présente invention.Figure 4 shows a view of a fractured surface and boss on a breakable bearing cap according to the present invention. Figure 5 shows a partial schematic view of a cylinder block according to the present invention.
Nous allons maintenant décrire les objets de la présente invention à l'aide des figures 1 à 5. Afin de minimiser la distance entre, d'une part, les flancs des chapeaux de paliers et les flancs de paliers du carter cylindres, et, d'autre part, les flancs du vilebrequin, un usinage est réalisé sur les flancs à l'aide d'une fraise. La figure 1 représente schématiquement cette étape d'usinage « standard » selon l'art antérieur. Un carter cylindres (13) possède un palier (14) sur lequel un chapeau de palier (non représenté) peut être fixé. Les flancs de palier (12) du carter cylindres sont usinés avec une fraise (11) située autour de son moyeu (10). Dans cette configuration, l'usinage de tout le flanc de palier (12) est possible par la fraise, car celle-ci peut être introduite et mise en contact avec l'intégralité du flanc de palier (12). L'usinage des chapeaux de palier est réalisé indépendamment et avec des moyens identiques. La figure 2 représente l'usinage dans le cas de l'utilisation d'un chapeau de palier sécable (40) selon l'art antérieur. L'usinage des flancs de palier (12) et des flancs du chapeau de palier (20) est impossible après la fracturation du chapeau de palier (40), car l'usinage modifierait l'état de surface de la zone fracturée, notamment au niveau de la ligne de jonction entre la surface fracturée et les flancs, et ne permettrait donc pas une bonne tenue du chapeau de palier sur le palier. L'usinage ne peut donc être réalisé qu'avant la fracturation. C'est pourquoi le chapeau de palier (40) est présent sur le palier (14) sur la figure 2. Le chapeau de palier (40) crée, avec le palier (14), un orifice circulaire (30) permettant l'introduction d'une partie d'un vilebrequin. Le diamètre de la fraise (11) à utiliser pour usiner les flancs du chapeau de palier (20) et les flancs du palier (12) est trop important, et la fraise ne peut pas être introduite contre les flancs pour l'usinage. L'usinage est donc impossible selon l'art antérieur.The objects of the present invention will now be described with reference to FIGS. 1 to 5. In order to minimize the distance between, on the one hand, the flanks of the bearing caps and the bearing flanks of the crankcase, and, on the other hand, the flanks of the crankshaft, a machining is carried out on the flanks with the aid of a milling cutter. Figure 1 shows schematically this "standard" machining step according to the prior art. A crankcase (13) has a bearing (14) on which a bearing cap (not shown) can be attached. The bearing flanks (12) of the crankcase are machined with a milling cutter (11) located around its hub (10). In this configuration, machining of the entire bearing flank (12) is possible by the cutter, because it can be introduced and brought into contact with the entire bearing flank (12). The machining of the bearing caps is performed independently and with identical means. Figure 2 shows the machining in the case of the use of a breakable bearing cap (40) according to the prior art. The machining of the bearing flanks (12) and the flanks of the bearing cap (20) is impossible after the fracture of the bearing cap (40), since the machining would modify the surface condition of the fractured zone, particularly at level of the junction line between the fractured surface and the flanks, and therefore would not allow a good holding of the bearing cap on the bearing. Machining can only be done before fracturing. This is why the bearing cap (40) is present on the bearing (14) in FIG. 2. The bearing cap (40) creates, with the bearing (14), a circular orifice (30) allowing the introduction part of a crankshaft. The diameter of the cutter (11) to be used for machining the flanks of the bearing cap (20) and the flanks of the bearing (12) is too large, and the cutter can not be inserted against the flanks for machining. Machining is therefore impossible according to the prior art.
La figure 3 présente un mode de réalisation possible de chapeau de palier sécable après cassage selon la présente invention, permettant l'usinage de ses flancs après l'opération de fracture.Figure 3 shows a possible embodiment breakable breakable bearing cap according to the present invention, allowing the machining of its flanks after the fracture operation.
Selon ce mode de réalisation possible, la forme générale du chapeau de palier sécable (1) de la présente invention ressemble à la forme générale d'un chapeau de palier sécable selon l'art antérieur. Il a des flancs ayant une forme proche d'un U, avec des bords droits et parallèles entre-eux, et une base reliant les deux branches du U perpendiculaire avec les bords. L'intérieur de la concavité, formée par les deux branches du U et par la base reliant les deux branches, forme un demi-cercle. Après le cassage, les deux surfaces fracturées (4) sont situées aux extrémités des deux bords parallèles, du côté opposé à la base reliant les deux bords. Les deux surfaces fracturées (4) sont usinées de manière à pouvoir introduire des vis de fixation par des orifices (5). La face d'appui (15) est la face située du côté opposé aux surfaces fracturées. La face d'appui (15) est, elle aussi, usinée au cours du procédé d'adaptation du vilebrequin sur le carter cylindres pour permettre l'introduction de deux vis de fixation dans les branches du U.According to this possible embodiment, the general shape of the breakable bearing cap (1) of the present invention resembles the general shape of a cap of breakable bearing according to the prior art. It has flanks having a shape close to a U, with straight edges and parallel to each other, and a base connecting the two branches of the perpendicular U with the edges. The interior of the concavity, formed by the two branches of the U and the base connecting the two branches, forms a semicircle. After breaking, the two fractured surfaces (4) are located at the ends of the two parallel edges, the opposite side to the base connecting the two edges. The two fractured surfaces (4) are machined so as to be able to introduce fastening screws through orifices (5). The bearing face (15) is the face located on the opposite side to the fractured surfaces. The bearing face (15) is also machined during the process of adaptation of the crankshaft on the cylinder block to allow the introduction of two fastening screws in the branches of the U.
Le chapeau de palier possède un bossage (2) sur ces deux flancs. Les contours du bossage (2) suivent globalement les contours du chapeau de palier (1). Le bossage (2) est présent sur quasiment toute l'intégralité des deux flancs du chapeau de palier (1). Avec ce bossage (2), les lignes de jonction (L) entre les flancs et les surfaces fracturées (4) sont en retrait par rapport à la partie saillante du bossage. La figure 4 présente une vue approchée de la jonction entre le bossage (2) et une surface fracturée (4).The bearing cap has a boss (2) on both flanks. The contours of the boss (2) generally follow the contours of the bearing cap (1). The boss (2) is present on almost the entire two flanks of the bearing cap (1). With this boss (2), the junction lines (L) between the flanks and the fractured surfaces (4) are set back relative to the projecting portion of the boss. Figure 4 shows an approximate view of the junction between the boss (2) and a fractured surface (4).
Selon ce mode de réalisation, l'usinage des flancs du chapeau de palier consiste à plaquer la fraise sur la partie saillante du bossage. Il est alors possible d'usiner les flancs du chapeau de palier après cassage, car la zone usinée n'est pas en contact direct avec la surface fracturée, et en particulier avec la ligne de jonction (L).According to this embodiment, the machining of the flanks of the bearing cap is to press the cutter on the projecting portion of the boss. It is then possible to machine the flanks of the bearing cap after breaking, because the machined area is not in direct contact with the fractured surface, and in particular with the junction line (L).
L'usinage des flancs du chapeau de palier après cassage se fait alors de la même façon que pour les chapeaux de palier standards et reste sans impact sur la surface fracturée.The machining of the flanks of the bearing cap after breaking is then done in the same way as for the standard bearing caps and remains without impact on the fractured surface.
Le chapeau de palier sécable selon la présente invention est donc réalisé en fonderie avec le carter cylindres. La figure 5 présente un carter cylindres (13) sur lequel le chapeau de palier (1), selon la présente invention, n'a pas encore été fracturé. L'étape de fonderie du carter cylindres prend en compte la présence du bossage (2) sur les flancs du chapeau. Une rainure (6) est présente sur le plan de joint de la cassure afin de mettre en retrait les flancs à usiner de la surface fracturable. Avec le chapeau de palier sécable de la présente invention, l'usinage de la ligne d'arbre du vilebrequin sur le carter cylindres à l'aide des paliers et des chapeaux de palier se fait selon les étapes suivantes :The breakable bearing cap according to the present invention is therefore made in the casting with the crankcase. Figure 5 shows a cylinder block (13) on which the bearing cap (1) according to the present invention has not yet been fractured. The casting step of the cylinder block takes into account the presence of the boss (2) on the flanks of the cap. A groove (6) is present on the joint plane of the break in order to indent the flanks to be machined of the fracturable surface. With the breakable bearing cap of the present invention, the machining of the crankshaft shaft line on the crankcase using the bearings and the bearing caps is done according to the following steps:
- un pré -usinage de la ligne d'arbre du carter cylindres recevant le vilebrequin est réalisé. Ce pré -usinage consiste à utiliser un outil d'alésage pour approcher le diamètre de la ligne d'arbre,- Pre-machining of the crankcase shaft line receiving the crankshaft is achieved. This pre-machining consists in using a boring tool to approach the diameter of the shaft line,
- un usinage de la face d'appui (15) et des trous de fixation (16) du chapeau de paliers,a machining of the bearing face (15) and of the fixing holes (16) of the bearing cap,
- une fracturation du chapeau de palier sécable (étape de « cassage »), - un usinage des flancs de paliers qui sont sur le carter cylindres,a fracturing of the breakable bearing cap ("breaking" step), a machining of the bearing flanks which are on the crankcase,
- un usinage de la partie saillante du bossage, sur les flancs des chapeaux de paliers à l'aide d'une fraise. Dans cette étape, l'usinage permet de modifier l'état de surface des flancs du chapeau de palier, sans altération de la surface fracturée, car celle-ci n'est pas en contact direct avec la zone usinée, - une fixation du chapeau de palier sur les paliers du carter cylindres, à l'aide des deux vis de fixations principales,- A machining of the projecting portion of the boss on the flanks of the bearing caps with a cutter. In this step, the machining makes it possible to modify the surface state of the flanks of the bearing cap, without altering the fractured surface, since it is not in direct contact with the machined zone, - a fixing of the cap bearing on the crankcase bearings, using the two main fastening screws,
- un usinage de finition de la ligne d'arbre du carter cylindres recevant le vilebrequin.a finishing machining of the crankcase shaft line receiving the crankshaft.
A noter que chaque chapeau est associé à un unique palier du carter cylindres. Il y a un « appariement » entre chaque chapeau et chaque palier. II doit être évident pour l'homme du métier que la présente invention permet des modes de réalisation sous de nombreuses autres formes spécifiques sans l'éloigner du domaine d'application de l'invention comme revendiquée. Par conséquent, le présent mode de réalisation doit être considéré à titre d'illustration, mais peut être modifié dans le domaine défini par la portée des revendications jointes, et l'invention ne doit pas être limitée aux détails donnés ci-dessus. Note that each cap is associated with a single bearing of the cylinder block. There is a "match" between each hat and each tier. It should be obvious to those skilled in the art that the present invention allows embodiments in many other specific forms without departing from the scope of the invention as claimed. Therefore, the present embodiment should be considered by way of illustration, but may be modified within the scope defined by the scope of the appended claims, and the invention should not be limited to the details given above.

Claims

Revendications claims
1. Chapeau de palier sécable (1) caractérisé en ce qu'il possède un bossage (2) sur une partie de chacun de ses flancs, dont les contours suivent sensiblement les contours du chapeau de palier (1), et que les lignes d'intersection (L) entre les surfaces fracturées (4) et les flancs du chapeau de palier (1) sont en retrait par rapport à la partie saillante du bossage (2).1. breakable bearing cap (1) characterized in that it has a boss (2) on a portion of each of its flanks, whose contours substantially follow the contours of the bearing cap (1), and that the lines of intersection (L) between the fractured surfaces (4) and the flanks of the bearing cap (1) are set back relative to the projecting portion of the boss (2).
2. Chapeau de palier sécable selon la revendication 1 caractérisé en ce que le contour du bossage (2) est proche du contour du flanc du chapeau de palier (1).2. breakable bearing cap according to claim 1 characterized in that the contour of the boss (2) is close to the contour of the side of the bearing cap (1).
3. Procédé de fabrication d'un carter cylindres (13) possédant un palier (12) et un chapeau de palier sécable (1) caractérisé en ce que le chapeau de palier sécable (1) possède un bossage (2) sur ses flancs, et qu'une rainure (6) est présente sur le plan de joint de la cassure du chapeau de palier (1).3. A method of manufacturing a crankcase (13) having a bearing (12) and a breakable bearing cap (1) characterized in that the breakable bearing cap (1) has a boss (2) on its flanks, and that a groove (6) is present on the joint plane of the break of the bearing cap (1).
4. Procédé permettant d'adapter, sur un carter cylindres (13), un chapeau de palier sécable (1) possédant un bossage (2) sur une partie de ses flancs dont les contours suivent sensiblement les contours du chapeau de palier (1), et telles que les lignes d'intersection (L) entre les surfaces fracturées (4) et les flancs du chapeau de palier (1) sont en retrait par rapport à la partie saillante du bossage (2), caractérisé en ce qu'il possède les étapes suivantes :4. A method of adapting, on a crankcase (13), a breakable bearing cap (1) having a boss (2) on a portion of its flanks whose contours substantially follow the contours of the bearing cap (1) , and such that the intersecting lines (L) between the fractured surfaces (4) and the flanks of the bearing cap (1) are set back relative to the projecting portion of the boss (2), characterized in that has the following steps:
- une étape de pré - usinage de la ligne d'arbre du carter cylindres recevant le vilebrequin,a pre-machining step of the crankcase shaft line receiving the crankshaft,
- une étape d'usinage de la face d'appui (15) et des trous de fixation (16) du chapeau de palier sécable (1),a step of machining the bearing face (15) and the fixing holes (16) of the breakable bearing cap (1),
- une étape de cassage du chapeau de palier sécable (1), une étape d'usinage des flancs de paliers (12) du carter cylindres (13), a step of breaking the breakable bearing cap (1), a step of machining the bearing flanks (12) of the crankcase (13),
PCT/EP2007/062866 2006-12-06 2007-11-27 Method for adapting a divisible cap piece on a cylinder housing and adapted divisible cap piece WO2008068165A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0610628A FR2909737B1 (en) 2006-12-06 2006-12-06 METHOD OF ADAPTING A SECONDARY BEARING HAT ON A CYLINDERS CASTER AND AN ADJUSTABLE SECONDARY BEARING HAT.
FR06/10628 2006-12-06

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Publication Number Publication Date
WO2008068165A2 true WO2008068165A2 (en) 2008-06-12
WO2008068165A3 WO2008068165A3 (en) 2008-09-04

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PCT/EP2007/062866 WO2008068165A2 (en) 2006-12-06 2007-11-27 Method for adapting a divisible cap piece on a cylinder housing and adapted divisible cap piece

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WO (1) WO2008068165A2 (en)

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Publication number Priority date Publication date Assignee Title
DE4413255A1 (en) * 1994-04-16 1995-10-19 Bayerische Motoren Werke Ag Method for breaking separation of the bearing cover of a multi-part bearing arrangement, in particular in crankcases of internal combustion engines
DE19547388A1 (en) * 1995-12-19 1997-06-26 Bayerische Motoren Werke Ag Manufacturing process for a casting machine part with a bearing arrangement designed in several parts by break separation

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FR2909737B1 (en) 2009-02-06
FR2909737A1 (en) 2008-06-13

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