EP0318353B1 - Grinding arrangement for the crankpins of a crankshaft - Google Patents

Grinding arrangement for the crankpins of a crankshaft Download PDF

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Publication number
EP0318353B1
EP0318353B1 EP19880402860 EP88402860A EP0318353B1 EP 0318353 B1 EP0318353 B1 EP 0318353B1 EP 19880402860 EP19880402860 EP 19880402860 EP 88402860 A EP88402860 A EP 88402860A EP 0318353 B1 EP0318353 B1 EP 0318353B1
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EP
European Patent Office
Prior art keywords
shell
crankshaft
shells
unit according
rectification unit
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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.)
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EP19880402860
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German (de)
French (fr)
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EP0318353A1 (en
Inventor
Paul Favrot
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Automobiles Peugeot SA
Automobiles Citroen SA
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Automobiles Peugeot SA
Automobiles Citroen SA
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Publication of EP0318353A1 publication Critical patent/EP0318353A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/42—Single-purpose machines or devices for grinding crankshafts or crankpins

Definitions

  • crankpin grinding machine which allows large-scale machining of parts with different bearing diameters.
  • several solutions have been proposed but they all lead to complicated mechanics, therefore unreliable, and lead to a decrease in rigidity and therefore in precision. For all these reasons they are only very little used in large automobile series where it is preferred to interpose, between the bearings of the crankshafts and the workpiece heads of the grinding machine, shells which are changed manually when modifying the type of crankshaft, which leads to campaigns whose duration is at least a few hours.
  • the present invention relates to a rectification assembly which allows, on the contrary, to machine in a random distribution, crankshafts which have not even between bearings and crankpins and same crankpin width but whose strokes and bearing diameters are different .
  • shells are used with each crankshaft such that, on the one hand, they blend with the diameter of the bearings, and on the other hand, they position the axis of the crank pin (s) on the machine. to be substantially corrected on the axis of rotation of the workpiece heads.
  • the grinding assembly includes a grinding machine 1 comprising a frame 2, a table 3 and two workpiece heads 4 fixed on the table 3. In each of these heads is mounted rotationally a spindle 5 secured a mounting element 6; the two pins are connected to a drive motor not shown by means of a common drive shaft 7 and sets of gears 8 and 9.
  • the assembly also includes a gantry 12 for loading and unloading the crankshafts 11 from a conveyor 13 to the grinding machine 1.
  • This gantry comprises a beam 14 which rests on feet 15 and on which a handling trolley can move 16 provided with two clamps 17 and two supports 18.
  • the assembly includes a support 19 on which are fixed bearings 20 for an axis 21 integral with two loading arms 22 and with respect to which a magazine 23 for shells 10 can move in the direction of the arrow f-f ′.
  • a motor 24 makes it possible to pivot the axis 21, therefore the arms 22.
  • crankshafts which have not even a between bearings and crankpins and same width b of crankpins, but the other dimensions of which, in particular the half-stroke c , can vary by a few millimeters.
  • the magazine 23 contains four shells per type of crankshaft programmed, the homologous shells being spaced by the distance e between the two arms 22.
  • each shell 10 can be fixed to one of the bearings 11 a of a crankshaft 11 by a dog 25 pivotally mounted at 26 relative to the shell.
  • This has a well 27 on the bottom of which is supported by a helical spring 28 pressing, by means of a pusher 29, on a beak 30 of the dog 25 and thus tending to maintain the latter in the closed position.
  • the shell carries a stop 31 which ensures the correct angular orientation of the shell relative to the crankshaft.
  • each loading arm 22 is integral with a double-acting hydraulic cylinder 32, the chambers of which can be brought into communication with a source of hydraulic pressure by holes 33 and 34.
  • the piston 35 of this cylinder can, when arm 22 occupies the position of Figure 4, engage in the well 27 and push the spout 30 against the action of the spring 28 to open the dog 25 and release the shell 10 from the crankshaft.
  • the arm 22 is also provided with a pin 36 suitable for engaging in a bore 37 of the shell perpendicular to the axis of the well 27.
  • each shell 10 has two bearing faces 10 a by which it can rest in a recess in one of the mounting elements 6.
  • rollers 41 supported in the mounting element 6. there is provided a roller 42 whose axis is integral with the jaw and a roller 43 which can be interposed between the roller 42 and a sleeve 44 carried by the fixing element 6.
  • the axis of this roller 43 is carried by a piston 45 which is movable in a chamber 46 of the mounting element 6.
  • a liquid under pressure can be admitted into the chamber 46 by holes 47 and 48 opening on either side of the piston 45.
  • the jaw arrives in the clamping position, it is positioned in front of the dog 25 by a stop screw 49 applied against the mounting element by a spring 50 tending to rotate the jaw relative to the mounting element.
  • a piston 51 movable in a chamber 52 of the mounting element can be applied against the jaw 38 by admitting a pressurized liquid into the chamber 52 by a bore 53, to loosen the jaw.
  • the rectification assembly which has just been described operates in the following manner.
  • the gantry 12 takes a raw crankshaft on the conveyor 13 at A, raises it at B, and translates to bring it to C where the two arms 22 load it with two shells 10 taken from the magazine 23.
  • the gap e between the arms 22 is equal to a in the case of the rectification of the central pins 11 b and to 3 a in the case of the extreme pins.
  • the arms 22 being at rest, as indicated in solid lines in Figure 3, come to take the desired shells in the magazine 23; the piston 35 is then brought into the extended position so as to open the hammer 25 and secure the shell with the arm, the force reaction of the piston 35 being absorbed by the pin 36 ( Figure 4). Then the arms continuing to move deposit the shells on the bearings 11b of the crankshaft; the pistons 35 are brought into position retracted so that the jaws 25 secure the shells to the crankshaft ( Figure 5).
  • crankshaft with its two shells is then translated into D, then loaded into E on the grinding machine 1.
  • the latter is thus fixed, by its shells 10, on the mounting elements 6 and its crank pins 11 b which are then coaxial with the pins 5 can be corrected.
  • the crankshaft After rectification, the crankshaft follows a reverse path. It is first released from the mounting elements 6 by admitting fluid through the holes 48 and 53, then brought back to D and C; in this position, it is released from its shells by admitting fluid into the jacks 32 through the holes 33, so that the pistons 35 push back the beaks 30 of the dogs 25. The shells 10 released are brought back into the magazine 23 by the arms 22 while the crankshaft returns to the conveyor 13 to be evacuated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Description

La technologie actuelle des moteurs à explosion conduit, à partir d'un bloc cylindrique de base caractérisé essentiellement par l'espacement des cylindres, à concevoir un grand nombre de moteurs particuliers, de puissances différentes, en faisant varier, notamment, la course du vilebrequin. La variation de puissance amène généralement à faire varier aussi le diamètre des paliers du vilebrequin. On crée, de ce fait, une famille de vilebrequins différant à la fois par leur diamètre de palier et leur course.Current technology of internal combustion engines leads, from a basic cylindrical block characterized essentially by the spacing of the cylinders, to design a large number of particular engines, of different powers, by varying, in particular, the stroke of the crankshaft . The variation in power generally causes the diameter of the crankshaft bearings to also vary. This creates a family of crankshafts differing both in their bearing diameter and their stroke.

Dans l'état actuel de la technique, on ne connait pas de machine de rectification de manetons qui permet d'usiner en grande série des pièces dont les diamètres de paliers sont différents. En ce qui concerne la course, par contre, plusieurs solutions ont été proposées mais elles conduisent toutes à une mécanique compliquée, donc peu fiable, et amènent une baisse de la rigidité et donc de la précision. Pour toutes ces raisons elles ne sont que très peu utilisées en grande série automobile où l'on préfère interposer, entre les paliers des vilebrequins et les têtes porte-pièces de la machine à rectifier, des coquilles qu'on change manuellement lorsqu'on modifie le type de vilebrequin, ce qui conduit à des campagnes dont la durée est d'au moins quelques heures.In the current state of the art, there is no known crankpin grinding machine which allows large-scale machining of parts with different bearing diameters. Regarding racing, however, several solutions have been proposed but they all lead to complicated mechanics, therefore unreliable, and lead to a decrease in rigidity and therefore in precision. For all these reasons they are only very little used in large automobile series where it is preferred to interpose, between the bearings of the crankshafts and the workpiece heads of the grinding machine, shells which are changed manually when modifying the type of crankshaft, which leads to campaigns whose duration is at least a few hours.

La présente invention a pour objet un ensemble de rectification qui permet, au contraire, d'usiner dans une distribution aléatoire, des vilebrequins qui ont même pas entre paliers et manetons et même largeur de maneton mais dont les courses et les diamètres de palier sont différents.The present invention relates to a rectification assembly which allows, on the contrary, to machine in a random distribution, crankshafts which have not even between bearings and crankpins and same crankpin width but whose strokes and bearing diameters are different .

Cet ensemble comporte:

  • une machine à rectifier munie de deux têtes porte-pièces équipées chacune d'un élément de montage porte-pièce, entraîné en rotation et muni de moyens de solidarisation pour une coquille sur laquelle est fixé l'un des paliers d'un vilebrequin à usiner de manière que ce dernier tourne autour de l'axe de ses manetons.
  • un convoyeur de pièces
  • et un portique de chargement et de déchargement des vilebrequins
    et est caractérisé en ce qu'il comporte en outre un dispositif pour le chargement et le déchargement des coquilles qui comprend un support pour des bras de chargement et de déchargement des coquilles et un magasin de coquilles qui est mobile par rapport au support et propre à présenter aux bras les coquilles appropriées, et en ce que les coquilles sont munies de moyens de fixation sur les vilebrequins qui sont indépendants des éléments de montage porte-pièces.
This set includes:
  • a grinding machine provided with two workpiece carrier heads each equipped with a workpiece support mounting element, driven in rotation and provided with fastening means for a shell on which is fixed one of the bearings of a crankshaft to be machined so that the latter rotates around the axis of its crankpins.
  • a parts conveyor
  • and a crane for loading and unloading crankshafts
    and is characterized in that it further comprises a device for loading and unloading the shells which comprises a support for arms for loading and unloading the shells and a shell magazine which is movable relative to the support and suitable for present the appropriate shells to the arms, and in that the shells are provided with fixing means on the crankshafts which are independent of the workpiece mounting elements.

Lors de l'utilisation de cet ensemble, on utilise avec chaque vilebrequin des coquilles telles que, d'une part elles se marient avec le diamètre des paliers, et d'autre part, elles positionnent sur la machine l'axe du ou des manetons à rectifier sensiblement sur l'axe de rotation des têtes porte-pièces.When using this assembly, shells are used with each crankshaft such that, on the one hand, they blend with the diameter of the bearings, and on the other hand, they position the axis of the crank pin (s) on the machine. to be substantially corrected on the axis of rotation of the workpiece heads.

On a décrit ci-après, à titre d'exemple non limitatif, un mode de réalisation de l'ensemble de rectification selon l'invention, avec référence aux dessins annexés dans lesquels:

  • La Figure 1 est une vue en élévation de cet ensemble;
  • La Figure 2 montre, à plus grande échelle, un vilebrequin monté et serré sur la machine à rectifier;
  • La Figure 3 est une coupe suivant III-III de la Figure 1 et montre en position de repos un bras du dispositif de chargement et de déchargement des coquilles;
  • La Figure 4 est une vue semblable à la Figure 3, une coquille étant en cours de transfert par le bras du magasin au vilebrequin ou inversement;
  • La Figure 5 est une vue semblable aux Figures 3 et 4, la coquille étant serrée sur un palier du vilebrequin alors que le bras de chargement s'apprête soit à l'enlever du vilebrequin, soit à l'y abandonner;
  • La Figure 6 est une vue en coupe suivant VI-VI de la Figure 2 et montre un vilebrequin serré sur la machine;
  • La Figure 7 est une vue en coupe suivant VII-VII de la Figure 6.
An embodiment of the rectification assembly according to the invention has been described below, by way of non-limiting example, with reference to the appended drawings in which:
  • Figure 1 is an elevational view of this assembly;
  • Figure 2 shows, on a larger scale, a crankshaft mounted and tightened on the grinding machine;
  • Figure 3 is a section along III-III of Figure 1 and shows in the rest position an arm of the device for loading and unloading the shells;
  • Figure 4 is a view similar to Figure 3, a shell being transferred by the arm of the magazine to the crankshaft or vice versa;
  • Figure 5 is a view similar to Figures 3 and 4, the shell being clamped on a bearing of the crankshaft while the loading arm is about to either remove it from the crankshaft, or to abandon it;
  • Figure 6 is a sectional view along VI-VI of Figure 2 and shows a crankshaft tightened on the machine;
  • Figure 7 is a sectional view along VII-VII of Figure 6.

Tel qu'il est représenté à la Figure 1, l'ensemble de rectification comporte une machine à rectifier 1 comprenant un bâti 2, une table 3 et deux têtes porte-pièces 4 fixées sur la table 3. Dans chacune de ces têtes est montée à rotation une broche 5 solidaire d'un élément de montage 6; les deux broches sont reliées à un moteur d'entraînement non représenté par l'intermédiaire d'un arbre d'entraînement commun 7 et de jeux d'engrenages 8 et 9. Des moyens décrits plus loin en détail permettent de solidariser à chacun des éléments de montage 6 une coquille 10 elle-même fixée à l'un des paliers 11a d'un vilebrequin 11 de façon que l'axe des broches 5 soit confondu avec l'un ou l'autre des axes X-X′ et Y-Y′ des manetons 11b de ce vilebrequin: le pas entre paliers et manetons est égal à a et chaque maneton a une largeur b.As shown in Figure 1, the grinding assembly includes a grinding machine 1 comprising a frame 2, a table 3 and two workpiece heads 4 fixed on the table 3. In each of these heads is mounted rotationally a spindle 5 secured a mounting element 6; the two pins are connected to a drive motor not shown by means of a common drive shaft 7 and sets of gears 8 and 9. Means described below in detail make it possible to secure each of the elements mounting 6 a shell 10 itself fixed to one of the bearings 11 a of a crankshaft 11 so that the axis of the pins 5 is coincident with one or the other of the axes XX ′ and YY ′ of crank pins 11 b of this crankshaft: the pitch between bearings and crank pins is equal to a and each crank pin has a width b .

L'ensemble comporte également un portique 12 pour le chargement et le déchargement des vilebrequins 11 depuis un convoyeur 13 à la machine à rectifier 1. Ce portique comporte une poutre 14 qui repose sur des pieds 15 et sur laquelle peut se déplacer un chariot de manutention 16 muni de deux pinces 17 et de deux appuis 18.The assembly also includes a gantry 12 for loading and unloading the crankshafts 11 from a conveyor 13 to the grinding machine 1. This gantry comprises a beam 14 which rests on feet 15 and on which a handling trolley can move 16 provided with two clamps 17 and two supports 18.

Enfin l'ensemble comporte un support 19 sur lequel sont fixés des paliers 20 pour un axe 21 solidaire de deux bras de chargement 22 et par rapport auquel un magasin 23 pour des coquilles 10 peut se déplacer dans le sens de la flèche f-f′. Un moteur 24 permet de faire pivoter l'axe 21, donc les bras 22.Finally, the assembly includes a support 19 on which are fixed bearings 20 for an axis 21 integral with two loading arms 22 and with respect to which a magazine 23 for shells 10 can move in the direction of the arrow f-f ′. A motor 24 makes it possible to pivot the axis 21, therefore the arms 22.

L'ensemble permet d'usiner des vilebrequins qui ont même pas a entre paliers et manetons et même largeur b de manetons, mais dont les autres cotes, notamment la demi-course c, peuvent varier de quelques millimètres.The assembly makes it possible to machine crankshafts which have not even a between bearings and crankpins and same width b of crankpins, but the other dimensions of which, in particular the half-stroke c , can vary by a few millimeters.

Les coquilles 10 ont une cote d = h + c, h étant une constante de la machine, et un diamètre d'empreinte égal au diamètre des paliers 11a (voir Figure 6). Le magasin 23 contient quatre coquilles par type de vilebrequin programmé, les coquilles homologues étant espacées par la distance e entre les deux bras 22.The shells 10 have a dimension d = h + c, h being a constant of the machine, and a cavity diameter equal to the diameter of the bearings 11 a (see Figure 6). The magazine 23 contains four shells per type of crankshaft programmed, the homologous shells being spaced by the distance e between the two arms 22.

Comme on le voit aux Figures 3 à 5, chaque coquille 10 peut être fixée sur l'un des paliers 11a d'un vilebrequin 11 par un chien 25 monté pivotant en 26 par rapport à la coquille. Celle-ci présente un puits 27 sur le fond duquel prend appui un ressort hélicoïdal 28 pressant, par l'intermédiaire d'un poussoir 29, sur un bec 30 du chien 25 et tendant ainsi à maintenir ce dernier dans la position fermée. La coquille porte une butée 31 qui assure l'orientation angulaire correcte de la coquille par rapport au vilebrequin.As seen in Figures 3 to 5, each shell 10 can be fixed to one of the bearings 11 a of a crankshaft 11 by a dog 25 pivotally mounted at 26 relative to the shell. This has a well 27 on the bottom of which is supported by a helical spring 28 pressing, by means of a pusher 29, on a beak 30 of the dog 25 and thus tending to maintain the latter in the closed position. The shell carries a stop 31 which ensures the correct angular orientation of the shell relative to the crankshaft.

De son côté, chaque bras de chargement 22 est solidaire d'un vérin hydraulique à double effet 32 dont les chambres peuvent être mises en communication avec une source de pression hydraulique par des perçages 33 et 34. Le piston 35 de ce vérin peut, lorsque le bras 22 occupe la position de la Figure 4, s'engager dans le puits 27 et repousser le bec 30 contre l'action du ressort 28 pour ouvrir le chien 25 et libérer la coquille 10 du vilebrequin. Le bras 22 est par ailleurs muni d'un pion 36 propre à s'engager dans un alésage 37 de la coquille perpendiculaire à l'axe du puits 27.For its part, each loading arm 22 is integral with a double-acting hydraulic cylinder 32, the chambers of which can be brought into communication with a source of hydraulic pressure by holes 33 and 34. The piston 35 of this cylinder can, when arm 22 occupies the position of Figure 4, engage in the well 27 and push the spout 30 against the action of the spring 28 to open the dog 25 and release the shell 10 from the crankshaft. The arm 22 is also provided with a pin 36 suitable for engaging in a bore 37 of the shell perpendicular to the axis of the well 27.

Comme on le voit aux Figures 6 et 7, chaque coquille 10 présente deux faces d'appui 10a par lesquelles elle peut reposer dans un évidement de l'un des éléments de montage 6. Un mors 38 monté pivotant sur l'élément de montage 6 autour d'un axe 39 logé dans un logement ovalisé 40 de l'élément de montage, peut être pressé sur le chien 25 pour maintenir la coquille 10 dans l'évidement de l'élément de montage; ce mors est guidé latéralement par des galets 41 prenant appui dans l'élément de montage 6. Pour assurer le déplacement du mors 38, il est prévu un galet 42 dont l'axe est solidaire du mors et un galet 43 qui peut s'intercaler entre le galet 42 et une fourrure 44 portée par l'élément de fixation 6. L'axe de ce galet 43 est porté par un piston 45 qui est mobile dans une chambre 46 de l'élément de montage 6. Un liquide sous pression peut être admis dans la chambre 46 par des perçages 47 et 48 débouchant de part et d'autre du piston 45. Lorsque le mors arrive en position de serrage, il est positionné en face du chien 25 par une vis butée 49 appliquée contre l'élément de montage par un ressort 50 tendant à faire pivoter le mors par rapport à l'élément de montage. Un piston 51 mobile dans une chambre 52 de l'élément de montage peut être appliqué contre le mors 38 par admission d'un liquide sous pression dans la chambre 52 par un perçage 53, pour desserer le mors. L'ensemble de rectification qui vient d'être décrit fonctionne de la manière suivante. Le portique 12 prend un vilebrequin brut sur le convoyeur 13 en A, l'élève en B, et se translate pour l'amener en C où les deux bras 22 le chargent de deux coquilles 10 prélevées dans le magasin 23. L'écart e entre les bras 22 est égal à a dans le cas de la rectification des manetons 11b centraux et à 3a dans le cas des manetons extrêmes. Les bras 22 étant au repos, comme indiqué en traits pleins à la Figure 3, viennent prendre les coquilles désirées dans le magasin 23; le piston 35 est alors amené en position sortie de façon à ouvrir le chien 25 et solidariser la coquille avec le bras, la réaction de l'effort du piston 35 étant encaissée par le pion 36 (Figure 4). Puis les bras continuant à se déplacer déposent les coquilles sur les paliers 11b du vilebrequin; les pistons 35 sont amenés en position rétractée de sorte que les mors 25 assurent la fixation des coquilles sur le vilebrequin (Figure 5).As seen in Figures 6 and 7, each shell 10 has two bearing faces 10 a by which it can rest in a recess in one of the mounting elements 6. A jaw 38 pivotally mounted on the mounting element 6 around an axis 39 housed in an ovalized housing 40 of the mounting element, can be pressed on the dog 25 to hold the shell 10 in the recess of the mounting element; this jaw is guided laterally by rollers 41 supported in the mounting element 6. To ensure the displacement of the jaw 38, there is provided a roller 42 whose axis is integral with the jaw and a roller 43 which can be interposed between the roller 42 and a sleeve 44 carried by the fixing element 6. The axis of this roller 43 is carried by a piston 45 which is movable in a chamber 46 of the mounting element 6. A liquid under pressure can be admitted into the chamber 46 by holes 47 and 48 opening on either side of the piston 45. When the jaw arrives in the clamping position, it is positioned in front of the dog 25 by a stop screw 49 applied against the mounting element by a spring 50 tending to rotate the jaw relative to the mounting element. A piston 51 movable in a chamber 52 of the mounting element can be applied against the jaw 38 by admitting a pressurized liquid into the chamber 52 by a bore 53, to loosen the jaw. The rectification assembly which has just been described operates in the following manner. The gantry 12 takes a raw crankshaft on the conveyor 13 at A, raises it at B, and translates to bring it to C where the two arms 22 load it with two shells 10 taken from the magazine 23. The gap e between the arms 22 is equal to a in the case of the rectification of the central pins 11 b and to 3 a in the case of the extreme pins. The arms 22 being at rest, as indicated in solid lines in Figure 3, come to take the desired shells in the magazine 23; the piston 35 is then brought into the extended position so as to open the hammer 25 and secure the shell with the arm, the force reaction of the piston 35 being absorbed by the pin 36 (Figure 4). Then the arms continuing to move deposit the shells on the bearings 11b of the crankshaft; the pistons 35 are brought into position retracted so that the jaws 25 secure the shells to the crankshaft (Figure 5).

L'ensemble du vilebrequin avec ses deux coquilles est alors translaté en D, puis chargé en E sur la machine à rectifier 1. On admet alors du liquide sous pression dans les chambres 46 par les perçages 47 de sorte que les mors 38 serrent les chiens 25 sur les portées 11a du vilebrequin 11. Ce dernier est ainsi fixé, par ses coquilles 10, sur les éléments de montage 6 et ses manetons 11b qui sont alors coaxiaux aux broches 5 peuvent être rectifiés.The entire crankshaft with its two shells is then translated into D, then loaded into E on the grinding machine 1. We then admit pressurized liquid into the chambers 46 through the holes 47 so that the jaws 38 grip the dogs 25 on the bearing surfaces 11 a of the crankshaft 11. The latter is thus fixed, by its shells 10, on the mounting elements 6 and its crank pins 11 b which are then coaxial with the pins 5 can be corrected.

Après rectification, le vilebrequin suit un trajet inverse. Il est tout d'abord libéré des éléments de montage 6 par admission de fluide par les perçages 48 et 53, puis ramené en D et en C; dans cette position, il est libéré de ses coquilles par admission de fluide dans les vérins 32 par les perçages 33, de sorte que les pistons 35 repoussent les becs 30 des chiens 25. Les coquilles 10 libérées sont ramenées dans le magasin 23 par les bras 22 pendant que le vilebrequin retourne sur le convoyeur 13 pour être évacué.After rectification, the crankshaft follows a reverse path. It is first released from the mounting elements 6 by admitting fluid through the holes 48 and 53, then brought back to D and C; in this position, it is released from its shells by admitting fluid into the jacks 32 through the holes 33, so that the pistons 35 push back the beaks 30 of the dogs 25. The shells 10 released are brought back into the magazine 23 by the arms 22 while the crankshaft returns to the conveyor 13 to be evacuated.

Il va de soi que la présente invention ne doit pas être considérée comme limitée au mode de réalisation décrit et représenté, mais en couvre, au contraire, toutes les variantes sans sortir du cadre des revendications.It goes without saying that the present invention should not be considered as limited to the embodiment described and shown, but on the contrary covers all variants thereof without departing from the scope of the claims.

Claims (7)

1. Unit for rectifying the crank pins of crankshafts having the same pitch between the bearings and crank pins and the same crank pin width and comprising:
- a rectifying machine (1) provided with two piece-holder heads (4) each equipped with a piece-holder mounting element (6) driven in rotation and provided with integralization means for a shell (10) to which one of the bearings (11a) of a crankshaft to be machined is secured so that said crankshaft rotates around the axis of its crank pins,
- a part conveyor (13),
- and a bridge (12) for loading and unloading the crankshafts (11),
wherein it further comprises a device to load and unload shells (10) and which includes a support (19) for the shell loading and unloading arms (22) and a shell magazine (23) which is mobile with respect to the support and suitably adapted to provide the arms with the appropriate shells (10), and wherein the shells (10) are provided with crankshaft fixing means independent of the piece-holder mounting elements (6).
2. Rectification unit according to claim 1, wherein the means for securing the shells (10) to the crankshaft (11) include for each shell a cock (25) mounted pivoting on the shell (10) and subjected to the action of a spring (28) tending to hold it in a closed position.
3. Rectification unit according to claim 2, wherein the spring (28) is disposed in one pit (27) of the shell (10).
4. Rectification unit according to claim 3, wherein each arm (22) bears a hydraulic piston (35) suitable for being engaged in the pit (27) and for bringing the cock into its opening position against the spring (28).
5. Rectification unit according to claim 3 or 4, wherein each arm (22) is provided with a slug (36) bujitable for being engaged in a bore (37) of the shell disposed perpendicular to the axis of the pit (27).
6. Rectification unit according to any one of claims 1 to 5, wherein the means to render integral one shell (10) with one mounting element (6) include a jaw (38) mounted pivoting on the mounting element and means to press this jaw on the shell (10) or an element of the latter, for example onto the cock (25) with which it is provided.
7. Rectification unit according to claim 6 and characterized by a hydraulic piston (51) to pivot the jaw (38) and bring it into its unclamping position.
EP19880402860 1987-11-26 1988-11-15 Grinding arrangement for the crankpins of a crankshaft Expired - Lifetime EP0318353B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8716828 1987-11-26
FR8716828A FR2623741B1 (en) 1987-11-26 1987-11-26 CRANKSHAFT CROSSBAR RECTIFICATION ASSEMBLY

Publications (2)

Publication Number Publication Date
EP0318353A1 EP0318353A1 (en) 1989-05-31
EP0318353B1 true EP0318353B1 (en) 1991-05-22

Family

ID=9357455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880402860 Expired - Lifetime EP0318353B1 (en) 1987-11-26 1988-11-15 Grinding arrangement for the crankpins of a crankshaft

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EP (1) EP0318353B1 (en)
DE (1) DE3862926D1 (en)
FR (1) FR2623741B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2664192B1 (en) * 1990-07-09 1992-10-02 Peugeot MACHINE FOR GRINDING CRANKSHAFT CRANKS.
GB9608351D0 (en) 1996-04-23 1996-06-26 Western Atlas Uk Ltd Composite component grinding method and apparatus
DE102016116161A1 (en) * 2016-08-30 2018-03-01 Supfina Grieshaber Gmbh & Co. Kg Machine tool and method for finishing machining of workpieces
CN108581702A (en) * 2018-05-31 2018-09-28 上汽大众汽车有限公司 Crank connecting link neck burring mechanism
CN112872439B (en) * 2021-01-18 2022-06-10 山西东鑫衡隆机械制造股份有限公司 Hole milling device for machining automobile crankshaft

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2780895A (en) * 1954-06-04 1957-02-12 Norton Co Crankpin grinding machine
DE2104904C3 (en) * 1971-02-03 1974-04-11 Werkzeugmaschinenfabrik Gildemeister & Co Ag, 4800 Bielefeld Clamping device for lathes and similar machine tools with quick change of the top clamping jaws
US4003721A (en) * 1976-04-26 1977-01-18 Landis Tool Company Cylindrical grinder

Also Published As

Publication number Publication date
DE3862926D1 (en) 1991-06-27
FR2623741A1 (en) 1989-06-02
FR2623741B1 (en) 1990-04-27
EP0318353A1 (en) 1989-05-31

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