EP2540446B1 - Device for facilitating the mounting of the snap rings of a piston pin of a vehicle engine - Google Patents

Device for facilitating the mounting of the snap rings of a piston pin of a vehicle engine Download PDF

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Publication number
EP2540446B1
EP2540446B1 EP12173504.7A EP12173504A EP2540446B1 EP 2540446 B1 EP2540446 B1 EP 2540446B1 EP 12173504 A EP12173504 A EP 12173504A EP 2540446 B1 EP2540446 B1 EP 2540446B1
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EP
European Patent Office
Prior art keywords
snap ring
piston
mounting
mounting tool
receiving groove
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.)
Active
Application number
EP12173504.7A
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German (de)
French (fr)
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EP2540446A1 (en
Inventor
Francois Soto Arias
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.)
PSA Automobiles SA
GM Global Technology Operations LLC
Original Assignee
Peugeot Citroen Automobiles SA
GM Global Technology Operations LLC
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Publication of EP2540446A1 publication Critical patent/EP2540446A1/en
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Publication of EP2540446B1 publication Critical patent/EP2540446B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/20—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same inserting or withdrawing split pins or circlips

Definitions

  • the present invention relates to a device for facilitating the mounting of stop rods of a vehicle engine piston pin, in particular motor vehicle engine.
  • the piston pin is an element that participates in the transformation of the linear movement of the piston in the cylinder in rotary motion of the crankshaft. It is on him that is positioned the small end by means of the connecting ring. In conventional manner, the piston pin is mounted in its housing and held in place by "circlips” or “clips” or “snap rings” (one on each side). This type of assembly allows a movement of the small end on the axis, but also the axis in the housing of the piston. This montage is called “free”.
  • the connecting rods and piston shafts can be assembled and removed by hand without any tools other than a circlip pliers.
  • the mounting of the snap rings in the piston receiving grooves is carried out by the mounting operator provided with a screwdriver which he manually guides, in a relatively erratic manner, which is liable to cause an accident and to damage the piston and / or the snap ring.
  • the document US 2,357,139 also discloses a manual tool to engage, without risk of damage, a circlip in the insertion groove of the axis of a piston.
  • the tool comprises a cylinder and barrel, hollow and grooved, with a conical portion, and a constant diameter corrugated pusher.
  • the barrel has a plurality of flutes on its inner peripheral surface. Each groove extends in the longitudinal direction and has a bottom surface parallel to the axis of the barrel.
  • the pusher while moving in the barrel, causes the circlip to move in said conical portion and to reduce its diameter in the barrel until it is placed in the insertion groove.
  • the object of the present invention is to provide a device for facilitating the mounting of stop rods of an axis of the vehicle engine piston, which reduces the mounting time of the latter and which reduces the efforts of implementation , therefore, the fatigue of the mounting operator.
  • Another object of the invention is to provide such a device, which eliminates the risk of injury to the mounting operator, in particular injury to the fingers of the latter, and which avoids damaging the piston and / or the rods stop.
  • Another object of the present invention is to provide such a device, which is of simpler design, construction and use than the known devices of the prior art.
  • the system for guiding and engaging the snap ring in its receiving groove is formed by two adjacent flanges, coaxial, projecting radially from the mounting tool, a first flange or "large flange", of greater diameter than the second flange, extending angularly on an incomplete circumference leaving a truncated angular sector of an angle between 80 ° and 90 ° and said second flange having in this truncated angular sector a decrease in radius substantially of the order of the diameter of the section of the snap ring so as to enable the snap ring to be gripped by the assembly tool.
  • the means for positioning the piston in a direction such that the piston axis is substantially vertical is constituted by a centering pin fixed on the surface of the piston support, said centering pin having a shoulder for receiving a lateral end face of the piston.
  • the mounting tool intended to push the snap ring progressively in its receiving groove, comprises a cylindrical end portion comprising an axial bore which cooperates with an end rod of the centering pin for guide the movements of the mounting tool when mounting the snap ring.
  • the end pin of the centering pin can be mounted screwed and dismountable on the centering pin.
  • the diameter of the second flange is substantially equal to the inner diameter of the stop ring in the mounted position in its receiving groove.
  • the snap ring may be of circular section with a diameter of about 1.4 mm.
  • the radius of the large flange is greater than the radius of the other flange by a value substantially equal to the radius of the circular section of the snap ring.
  • the centering pin may advantageously have a shoulder of its upper lateral surface off the guide rod, which shoulder makes it possible to dodge the first stop ring already in place in its receiving groove when mounting the second stop seal of the piston axis.
  • the mounting tool according to the present invention is shown, making it possible to easily mount an axle stop ring piston, general reference 30, of circular shape and section, shown in the drawing of the figure 3 .
  • This mounting tool of general reference 1, cylindrical and of axis xx ', comprises four coaxial parts: a cylindrical end portion 11, a "placing" part referenced 12, 13, which forms, as explained more far in the text, a guide and engagement system of the snap ring 30, a cylindrical middle portion 14, of diameter in relation to the inner diameter of the snap ring 30 in the mounted position and a gripping portion 15 , cylindrical, outer surface knurled, preferably having received a cross knurling, so as to better ensure the adhesion of the hand of the mounting operator on the tool.
  • This support 2 comprises a sole or any other type of flat surface support 2A and a centering pin, of general reference 20, of longitudinal axis "A" substantially orthogonal to the flat surface 2A.
  • the centering pin 20, with axis "A" is intended to receive a piston 50 by insertion of the latter into the bearing bore 50A ( figures 4 and 9 ) of the axis 60 of the piston 50, as shown in the drawing of the figure 4 , said piston 50 being illustrated in particular by its segments 51.
  • the piston pin 60 is intended to be positioned between two translational stops formed by two resilient snap rings of identical type to the snap ring 30 shown in FIG. figure 3 , that is to say a ring-shaped stop ring (outer diameter "D") and also circular section (diameter "d").
  • the centering pin 20 of the figure 2 is described in more detail with reference to the drawing of the figure 5 .
  • the centering pin 20, fixed on the surface 2A of the support 2 comprises different coaxial cylindrical parts, namely a base portion 21, a main body portion 22, a shoulder 23 defining a radial bearing surface 27 and a guide rod 25 to secure the positioning of the piston before the engagement of the tool 1 mounted by screwing in a threaded bore 26 of the pin.
  • a shoulder 24 is provided on the shoulder 23, whose function is explained later in this text.
  • the end portion of the mounting tool 1 is better represented in the drawing of the Figures 6 and 7 .
  • the cylindrical end portion 11 is pierced with an axial bore 11A of sufficient diameter to allow to receive the guide rod 25 of the centering pin 20.
  • the positioning portion 12, 13 constitutes a guide system and engagement of the snap ring 30 in its receiving groove.
  • This guide system is formed by two adjacent collars, coaxial, in radial projections of the mounting tool 1: a first flange or "large flange" 13 and a second flange 12, of smaller diameter than the large flange 13.
  • the large flange 13 extends angularly over an incomplete circumference leaving a truncated angular sector of an angle " ⁇ " between 80 ° and 90 ° and a decrease in radius of "d".
  • the second flange 12 has a diameter 12A, and in a truncated angular sector "a + 2 a '", a decrease in radius of width up to "e", "e” being substantially of the order of "d / 2 "of the section of the snap ring 30 which serves as a support and thrust of the snap ring 30 at the bottom of the groove.
  • the reference 13A designates a radial shoulder surface formed by the flange, so as to allow the snap ring 30 to be gripped by the assembly tool 1. During its assembly, as explained below in the description operation of the invention, with reference to the drawings of Figures 8 and 9 .
  • the piston 50 and its piston pin 60 are put in place on the piston support 2, so that the lower lateral surface of the piston 60 abuts on the radial bearing surface 27 defined by the shoulder 23 of the piston. 20.
  • the diameter "d 2 " ( figure 9 ) of the shoulder 23 is equal to the diameter of the internal bore of the piston in which is inserted the axis 60.
  • One of the ends of the snap ring 30 is positioned in the receiving groove 52 of the piston in which it is intended to be placed by means of the device of the invention, that is to say overflow the groove 52.
  • the mounting tool 1 is then engaged on the centering pin 20 of the support 2, that is to say the end portion 11 of the tool on the guide rod 25 of the centering pin 20.
  • the operator grasps the mounting tool 1 by its knurled portion 15.
  • the mounting tool hooks, folds and pushes the snap ring 30 against the radial surface 13A of the tool 1.
  • the operator also prints to the mounting tool 1 a rotational movement (arrow “R"), which allows to force, thanks to the shape of the two flanges 12 and 13 mentioned above, the stop ring 30 to be placed in its receiving groove 52.
  • the reference 30 'designates the snap ring in place in its receiving groove 52.
  • the diameter "D" of the groove corresponds the outer diameter of the ring in the mounted position, so in the tight position.
  • the radial depth of the groove 52 is substantially of the order of the radius of the snap ring 30.
  • the mounting tool 1 is reassembled.
  • the truncated stop surfaces 13C and 13D of the flange 13 are substantially inclined relative to the radial plane so as to favor the setting of the snap ring by the mounting tool 1.
  • the shoulder, mentioned above, provided on the shoulder 23 of the centering pin 20 has the function of allowing to dodge the first snap ring already in place in its receiving groove when mounting the second seal of stop of the piston pin.
  • the mounting tool 1 of the device of the invention described above has many advantages, among which the following advantages:
  • the device of the invention described above as a whole facilitates the mounting of the snap rings and reduces their assembly time. Because there is no direct contact between the snap ring and the hand of the mounting operator, the latter presents less risk of injury and, moreover, works with less effort and, therefore, tired.
  • the rods mounting device of the invention is a simpler design, embodiment and use device than the known devices of the prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Automatic Assembly (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)

Description

La présente invention concerne un dispositif permettant de faciliter le montage des joncs d'arrêt d'un axe de piston de moteur de véhicule, en particulier de moteur de véhicule automobile.The present invention relates to a device for facilitating the mounting of stop rods of a vehicle engine piston pin, in particular motor vehicle engine.

L'axe de piston est un élément qui participe à la transformation du mouvement linéaire du piston dans le cylindre en mouvement rotatif du vilebrequin. C'est sur lui que vient se positionner le pied de bielle par l'intermédiaire de la bague de bielle. De façon classique, l'axe de piston est monté dans son logement et maintenu en place par des « circlips » ou « clips » ou encore « joncs d'arrêt » (un de chaque côté). Ce type de montage permet un mouvement du pied de bielle sur l'axe, mais aussi de l'axe dans le logement du piston. Ce montage est dit « libre ». On peut monter et démonter les bielles et les axes des pistons, à la main, sans autre outil qu'une pince à circlips.The piston pin is an element that participates in the transformation of the linear movement of the piston in the cylinder in rotary motion of the crankshaft. It is on him that is positioned the small end by means of the connecting ring. In conventional manner, the piston pin is mounted in its housing and held in place by "circlips" or "clips" or "snap rings" (one on each side). This type of assembly allows a movement of the small end on the axis, but also the axis in the housing of the piston. This montage is called "free". The connecting rods and piston shafts can be assembled and removed by hand without any tools other than a circlip pliers.

De manière générale, le montage des joncs d'arrêt dans des gorges de réception du piston est réalisé par l'opérateur de montage muni d'un tournevis qu'il guide manuellement, de façon relativement erratique, susceptible de causer un accident et d'endommager le piston et/ou le jonc d'arrêt.In general, the mounting of the snap rings in the piston receiving grooves is carried out by the mounting operator provided with a screwdriver which he manually guides, in a relatively erratic manner, which is liable to cause an accident and to damage the piston and / or the snap ring.

On a déjà cherché à améliorer les moyens de montage de circlips ou joncs d'arrêt dans des gorges de réception d'un piston. Ce type de dispositif est décrit par exemple dans le document US 6 507 985 .It has already been sought to improve the means for mounting circlips or snap rings in grooves for receiving a piston. This type of device is described for example in the document US 6,507,985 .

Ainsi, à titre d'exemple, le document US 2 357 139 décrit aussi un outil manuel pour enclencher, sans risque de détérioration, un circlip dans la gorge d'insertion de l'axe d'un piston. L'outil comporte un cylindre ou barillet, creux et cannelé, avec une partie conique, et un poussoir à cannelures à diamètre constant. Le barillet présente une pluralité de cannelures sur sa surface périphérique interne. Chaque cannelure s'étend selon la direction longitudinale et présente une surface de fond parallèle à l'axe du barillet. Le poussoir, en se déplaçant dans le barillet, vient forcer le circlip à se déplacer dans ladite partie conique et à réduire son diamètre dans le barillet jusqu'à venir se placer dans la gorge d'insertion.For example, the document US 2,357,139 also discloses a manual tool to engage, without risk of damage, a circlip in the insertion groove of the axis of a piston. The tool comprises a cylinder and barrel, hollow and grooved, with a conical portion, and a constant diameter corrugated pusher. The barrel has a plurality of flutes on its inner peripheral surface. Each groove extends in the longitudinal direction and has a bottom surface parallel to the axis of the barrel. The pusher, while moving in the barrel, causes the circlip to move in said conical portion and to reduce its diameter in the barrel until it is placed in the insertion groove.

Toutefois, un tel outil est de fabrication relativement coûteuse, du fait des fortes exigences géométriques sur toutes les cotes des cannelures. De plus, un tel outil, par son encombrement, ne peut s'appliquer à toutes les formes de piston.However, such a tool is relatively expensive to manufacture, because of the high geometric requirements on all sides of the flutes. In addition, such a tool, by its size, can not be applied to all forms of piston.

Le but de la présente invention est de fournir un dispositif permettant de faciliter le montage des joncs d'arrêt d'un axe du piston de moteur de véhicule, qui réduise le temps de montage de ces derniers et qui diminue les efforts de mise en place, par conséquent, la fatigue de l'opérateur de montage.The object of the present invention is to provide a device for facilitating the mounting of stop rods of an axis of the vehicle engine piston, which reduces the mounting time of the latter and which reduces the efforts of implementation , therefore, the fatigue of the mounting operator.

Un autre but de l'invention est de fournir un tel dispositif, qui supprime le risque de blessure de l'opérateur de montage, en particulier de blessure aux doigts de ce dernier, et qui évite d'endommager le piston et/ou les joncs d'arrêt.Another object of the invention is to provide such a device, which eliminates the risk of injury to the mounting operator, in particular injury to the fingers of the latter, and which avoids damaging the piston and / or the rods stop.

Un autre but de la présente invention est de fournir un tel dispositif, qui soit de conception, de réalisation et d'utilisation plus simples que les dispositifs connus de l'art antérieur.Another object of the present invention is to provide such a device, which is of simpler design, construction and use than the known devices of the prior art.

Enfin, c'est également un but de la présente invention de fournir un tel dispositif, qui soit, de manière générale, robuste, fiable et économique.Finally, it is also an object of the present invention to provide such a device, which is generally robust, reliable and economical.

Pour parvenir à ces buts, la présente invention a pour objet un dispositif permettant de faciliter le montage d'un jonc d'arrêt d'un axe de piston de moteur de véhicule, en particulier de moteur de véhicule automobile, et ce dispositif comporte les moyens suivants :

  • un support de piston, qui présente un moyen de mise en position du piston selon une direction telle que l'axe de piston soit sensiblement vertical, et
  • un outil de montage, destiné à pousser le jonc d'arrêt de manière progressive dans sa gorge de réception prévue dans le piston, ledit outil de montage présentant un système de guidage et d'engagement dudit jonc d'arrêt qui crochète, rabat et pousse le jonc d'arrêt lors du mouvement de descente et de rotation de l'outil de montage jusqu'à ce que le jonc d'arrêt vienne se loger dans ladite gorge de réception.
To achieve these aims, the present invention relates to a device for facilitating the mounting of a stop ring of a vehicle engine piston pin, in particular of a motor vehicle engine, and this device comprises the following means:
  • a piston support, which has means for positioning the piston in a direction such that the piston axis is substantially vertical, and
  • a mounting tool, intended to push the snap ring gradually in its receiving groove provided in the piston, said mounting tool having a guide and engagement system of said snap ring which hooks, flaps and pushes the snap ring during the movement of descent and rotation of the mounting tool until the snap ring is housed in said receiving groove.

Selon le mode préféré de réalisation de l'invention, le système de guidage et d'engagement du jonc d'arrêt dans sa gorge de réception est formé par deux collerettes adjacentes, coaxiales, en saillie radiale de l'outil de montage, une première collerette ou « grande collerette », de plus grand diamètre que la seconde collerette, s'étendant angulairement sur une circonférence incomplète laissant un secteur angulaire tronqué d'un angle compris entre 80° et 90° et ladite seconde collerette présentant dans ce secteur angulaire tronqué une diminution de rayon sensiblement de l'ordre du diamètre de la section du jonc d'arrêt de façon à permettre la prise du jonc d'arrêt par l'outil de montage.According to the preferred embodiment of the invention, the system for guiding and engaging the snap ring in its receiving groove is formed by two adjacent flanges, coaxial, projecting radially from the mounting tool, a first flange or "large flange", of greater diameter than the second flange, extending angularly on an incomplete circumference leaving a truncated angular sector of an angle between 80 ° and 90 ° and said second flange having in this truncated angular sector a decrease in radius substantially of the order of the diameter of the section of the snap ring so as to enable the snap ring to be gripped by the assembly tool.

Selon le mode préféré de réalisation de l'invention également, le moyen de mise en position du piston selon une direction telle que l'axe de piston soit sensiblement vertical est constitué par un pion de centrage fixé sur la surface du support de piston, ledit pion de centrage présentant un épaulement destiné à recevoir une face latérale d'extrémité du piston.According to the preferred embodiment of the invention also, the means for positioning the piston in a direction such that the piston axis is substantially vertical is constituted by a centering pin fixed on the surface of the piston support, said centering pin having a shoulder for receiving a lateral end face of the piston.

De préférence, l'outil de montage, destiné à pousser le jonc d'arrêt de manière progressive dans sa gorge de réception, comprend une partie cylindrique d'extrémité comprenant un alésage axial qui coopère avec une tige d'extrémité du pion de centrage pour guider les mouvements de l'outil de montage lors du montage du jonc d'arrêt.Preferably, the mounting tool, intended to push the snap ring progressively in its receiving groove, comprises a cylindrical end portion comprising an axial bore which cooperates with an end rod of the centering pin for guide the movements of the mounting tool when mounting the snap ring.

La tige d'extrémité du pion de centrage peut être montée vissée et démontable sur le pion de centrage.The end pin of the centering pin can be mounted screwed and dismountable on the centering pin.

De manière avantageuse, le diamètre de la seconde collerette est sensiblement égal au diamètre interne du jonc d'arrêt en position montée dans sa gorge de réception.Advantageously, the diameter of the second flange is substantially equal to the inner diameter of the stop ring in the mounted position in its receiving groove.

A titre d'exemple non limitatif de la portée et de l'objet de la présente invention, le jonc d'arrêt peut être de section circulaire de diamètre voisin de 1,4 mm.As a non-limiting example of the scope and object of the present invention, the snap ring may be of circular section with a diameter of about 1.4 mm.

De manière avantageuse, le rayon de la grande collerette est supérieur au rayon de l'autre collerette d'une valeur sensiblement égale au rayon de la section circulaire du jonc d'arrêt.Advantageously, the radius of the large flange is greater than the radius of the other flange by a value substantially equal to the radius of the circular section of the snap ring.

Le pion de centrage peut avantageusement présenter un épaulement de sa surface latérale supérieure hors tige de guidage, lequel épaulement permet d'esquiver le premier jonc d'arrêt déjà en place dans sa gorge de réception lors du montage du second joint d'arrêt de l'axe du piston.The centering pin may advantageously have a shoulder of its upper lateral surface off the guide rod, which shoulder makes it possible to dodge the first stop ring already in place in its receiving groove when mounting the second stop seal of the piston axis.

L'invention a aussi pour objet un procédé de montage d'un jonc d'arrêt d'un axe de piston de moteur de véhicule, en particulier de moteur de véhicule automobile et qui comporte les étapes suivantes, prises en combinaison :

  • on place le piston et son axe de piston sur le support de piston dudit dispositif, de telle sorte que la surface latérale inférieure du piston vienne buter sur la surface d'appui radiale définie par l'épaulement du pion de centrage,
  • on pose le jonc d'arrêt en débordement de la gorge de réception du piston dans laquelle il est destiné à être placé,
  • On engage manuellement l'outil de montage dudit dispositif sur le pion de centrage du support de piston,
  • on fait descendre l'outil de montage bien positionné en fonction de la position du jonc d'arrêt et ensuite on lui imprime un mouvement de rotation, afin de crocheter, rabattre et pousser le jonc d'arrêt vers la gorge de réception,
  • une fois le jonc d'arrêt en place dans sa gorge de réception, on remonte l'outil de montage.
The invention also relates to a method of mounting a stop ring of a vehicle engine piston pin, in particular of a motor vehicle engine and which comprises the following steps, taken in combination:
  • the piston and its piston pin are placed on the piston support of said device, so that the lower lateral surface of the piston abuts on the radial bearing surface defined by the shoulder of the centering pin,
  • the snap ring is placed in overflow of the receiving groove of the piston in which it is intended to be placed,
  • The mounting tool of said device is manually engaged on the centering pin of the piston support,
  • the well-positioned mounting tool is lowered in accordance with the position of the snap ring and then rotated so as to hook, fold and push the snap ring towards the receiving groove,
  • once the snap ring is in place in its receiving groove, the mounting tool is reassembled.

D'autres buts, avantages et caractéristiques de l'invention apparaîtront dans la description qui suit d'un exemple de réalisation, non limitatif de l'objet et de la portée de la présente demande de brevet, accompagnée de dessins dans lesquels :

  • la figure 1 est une vue en perspective de l'outil de montage manuel d'un jonc d'arrêt d'axe de piston, selon la présente invention,
  • la figure 2 est une vue en perspective du support de piston selon l'invention permettant de maintenir en position le piston lors du montage du jonc d'arrêt de l'axe du piston,
  • la figure 3 représente le jonc d'arrêt d'axe de piston à monter sur le piston en utilisant l'outil de montage de la figure 1 et le support de piston de la figure 2,
  • la figure 4 est une vue en perspective représentant le piston en position sur le support de piston de la figure 2 avant le montage du jonc d'arrêt de l'axe du piston,
  • la figure 5 représente le pion de centrage du support de piston des figures 2 et 4,
  • la figure 6 représente la partie fonctionnelle d'extrémité de l'outil de montage de la figure 1 qui permet la mise en place du joint d'arrêt de l'axe de piston dans la gorge du piston,
  • la figure 7 est une vue de dessus de l'outil de montage de l'invention,
  • la figure 8 est une vue en perspective de l'outil de montage en position de montage du jonc d'arrêt d'axe de piston, et
  • la figure 9 est une vue en coupe longitudinale de l'outil de montage en position de montage du second jonc d'arrêt d'axe de piston, immédiatement avant le placement dudit second jonc d'arrêt dans sa gorge de réception.
Other objects, advantages and features of the invention will become apparent from the following description of an example of a non-limiting embodiment of the object and of the scope of the present patent application, accompanied by drawings in which:
  • the figure 1 is a perspective view of the manual mounting tool of a piston pin stop ring, according to the present invention,
  • the figure 2 is a perspective view of the piston support according to the invention for maintaining in position the piston during assembly of the stop ring of the piston pin,
  • the figure 3 represents the piston pin stop ring to be mounted on the piston using the mounting tool of the figure 1 and the piston support of the figure 2 ,
  • the figure 4 is a perspective view showing the piston in position on the piston support of the figure 2 before mounting the snap ring of the piston pin,
  • the figure 5 represents the centering pin of the piston support of the Figures 2 and 4 ,
  • the figure 6 represents the end functional part of the assembly tool of the figure 1 which allows the establishment of the stop seal of the piston pin in the groove of the piston,
  • the figure 7 is a view from above of the mounting tool of the invention,
  • the figure 8 is a perspective view of the mounting tool in the mounting position of the piston pin stop ring, and
  • the figure 9 is a longitudinal sectional view of the mounting tool in the mounting position of the second piston pin stop ring, immediately before the placement of said second snap ring in its receiving groove.

En référence au dessin de la figure 1, on a représenté l'outil de montage selon la présente invention, permettant de monter aisément un jonc d'arrêt d'axe de piston, de référence générale 30, de forme et de section circulaires, représenté sur le dessin de la figure 3.With reference to the drawing of the figure 1 , the mounting tool according to the present invention is shown, making it possible to easily mount an axle stop ring piston, general reference 30, of circular shape and section, shown in the drawing of the figure 3 .

Cet outil de montage, de référence générale 1, cylindrique et d'axe xx', comprend quatre parties coaxiales : une partie cylindrique d'extrémité 11, une partie de « mise en place » référencée 12, 13, qui forme, comme expliqué plus loin dans le texte, un système de guidage et d'engagement du jonc d'arrêt 30, une partie médiane 14, cylindrique, de diamètre en rapport avec le diamètre interne du jonc d'arrêt 30 en position montée et une partie de préhension 15, cylindrique, à surface externe moletée, de préférence ayant reçu un moletage croisé, de façon à mieux garantir l'adhérence de la main de l'opérateur de montage sur l'outil.This mounting tool, of general reference 1, cylindrical and of axis xx ', comprises four coaxial parts: a cylindrical end portion 11, a "placing" part referenced 12, 13, which forms, as explained more far in the text, a guide and engagement system of the snap ring 30, a cylindrical middle portion 14, of diameter in relation to the inner diameter of the snap ring 30 in the mounted position and a gripping portion 15 , cylindrical, outer surface knurled, preferably having received a cross knurling, so as to better ensure the adhesion of the hand of the mounting operator on the tool.

Selon l'invention, il est également prévu un support spécifique, de référence générale 2, représenté sur le dessin de la figure 2. Ce support 2, désigné « support de piston » dans la suite du texte, comprend une semelle ou tout autre type de support à surface plane 2A et un pion de centrage, de référence générale 20, d'axe longitudinal « A » sensiblement orthogonal à la surface plane 2A.According to the invention, there is also provided a specific support, general reference 2, shown in the drawing of the figure 2 . This support 2, designated "piston support" in the rest of the text, comprises a sole or any other type of flat surface support 2A and a centering pin, of general reference 20, of longitudinal axis "A" substantially orthogonal to the flat surface 2A.

Le pion de centrage 20, d'axe « A », est destiné à recevoir un piston 50 par insertion de ce dernier dans l'alésage formant palier 50A (figures 4 et 9) de l'axe 60 du piston 50, comme représenté sur le dessin de la figure 4, ledit piston 50 étant illustré notamment par ses segments 51.The centering pin 20, with axis "A", is intended to receive a piston 50 by insertion of the latter into the bearing bore 50A ( figures 4 and 9 ) of the axis 60 of the piston 50, as shown in the drawing of the figure 4 , said piston 50 being illustrated in particular by its segments 51.

L'axe de piston 60 est destiné à être positionné entre deux butées en translation formées par deux joncs d'arrêt, élastiques, de type identique au jonc d'arrêt 30 représenté sur la figure 3, c'est-à-dire à un jonc d'arrêt de forme circulaire (diamètre externe « D ») et de section également circulaire (diamètre «d»).The piston pin 60 is intended to be positioned between two translational stops formed by two resilient snap rings of identical type to the snap ring 30 shown in FIG. figure 3 , that is to say a ring-shaped stop ring (outer diameter "D") and also circular section (diameter "d").

Le pion de centrage 20 de la figure 2 est décrit plus en détail, en référence au dessin de la figure 5. Le pion de centrage 20, fixé sur la surface 2A du support 2, comporte différentes parties cylindriques coaxiales, à savoir une partie de socle 21, une partie de corps principal 22, un épaulement 23 définissant une surface d'appui radiale 27 et une tige de guidage 25 pour sécuriser le positionnement du piston avant l'engagement de l'outil 1 montée par vissage dans un alésage taraudé 26 du pion. Un épaulement 24 est prévu sur l'épaulement 23, dont la fonction est expliquée plus loin dans le présent texte.The centering pin 20 of the figure 2 is described in more detail with reference to the drawing of the figure 5 . The centering pin 20, fixed on the surface 2A of the support 2, comprises different coaxial cylindrical parts, namely a base portion 21, a main body portion 22, a shoulder 23 defining a radial bearing surface 27 and a guide rod 25 to secure the positioning of the piston before the engagement of the tool 1 mounted by screwing in a threaded bore 26 of the pin. A shoulder 24 is provided on the shoulder 23, whose function is explained later in this text.

La partie d'extrémité de l'outil de montage 1 est mieux représentée sur le dessin des figures 6 et 7. La partie cylindrique d'extrémité 11 est percée d'un alésage axial 11 A de diamètre suffisant pour permettre de recevoir la tige de guidage 25 du pion de centrage 20. La partie de mise en place 12, 13 constitue un système de guidage et d'engagement du jonc d'arrêt 30 dans sa gorge de réception. Ce système de guidage est formé par deux collerettes adjacentes, coaxiales, en saillies radiales de l'outil de montage 1 : une première collerette ou « grande collerette » 13 et une seconde collerette 12, de diamètre inférieur à la grande collerette 13. La grande collerette 13 s'étend angulairement sur une circonférence incomplète laissant un secteur angulaire tronqué d'un angle « α » compris entre 80° et 90° et une diminution de rayon de « d ». La seconde collerette 12 présente un diamètre 12A, et dans un secteur angulaire tronqué « a + 2 a'», une diminution de rayon de largeur allant jusqu'à « e », « e » étant sensiblement de l'ordre de « d/2 » de la section du jonc d'arrêt 30 qui sert d'appui et de poussée du jonc d'arrêt 30 en fond de gorge. La référence 13A désigne une surface radiale d'épaulement formée par la collerette, de façon à permettre la prise du jonc d'arrêt 30 par l'outil de montage 1. Lors de son montage, comme il est expliqué ci-après dans la description du fonctionnement de l'invention, en référence aux dessins des figures 8 et 9.The end portion of the mounting tool 1 is better represented in the drawing of the Figures 6 and 7 . The cylindrical end portion 11 is pierced with an axial bore 11A of sufficient diameter to allow to receive the guide rod 25 of the centering pin 20. The positioning portion 12, 13 constitutes a guide system and engagement of the snap ring 30 in its receiving groove. This guide system is formed by two adjacent collars, coaxial, in radial projections of the mounting tool 1: a first flange or "large flange" 13 and a second flange 12, of smaller diameter than the large flange 13. The large flange 13 extends angularly over an incomplete circumference leaving a truncated angular sector of an angle "α" between 80 ° and 90 ° and a decrease in radius of "d". The second flange 12 has a diameter 12A, and in a truncated angular sector "a + 2 a '", a decrease in radius of width up to "e", "e" being substantially of the order of "d / 2 "of the section of the snap ring 30 which serves as a support and thrust of the snap ring 30 at the bottom of the groove. The reference 13A designates a radial shoulder surface formed by the flange, so as to allow the snap ring 30 to be gripped by the assembly tool 1. During its assembly, as explained below in the description operation of the invention, with reference to the drawings of Figures 8 and 9 .

Le piston 50 et son axe de piston 60 sont mis en place sur le support de piston 2, de telle sorte que la surface latérale inférieure du piston 60 vienne buter sur la surface d'appui radiale 27 définie par l'épaulement 23 du pion de centrage 20. Afin de supporter et de réaliser le centrage de l'axe du piston, le diamètre « d2 » (figure 9) de l'épaulement 23 est égal au diamètre de l'alésage interne du piston dans lequel vient s'insérer l'axe 60.The piston 50 and its piston pin 60 are put in place on the piston support 2, so that the lower lateral surface of the piston 60 abuts on the radial bearing surface 27 defined by the shoulder 23 of the piston. 20. In order to support and realize the centering of the axis of the piston, the diameter "d 2 " ( figure 9 ) of the shoulder 23 is equal to the diameter of the internal bore of the piston in which is inserted the axis 60.

Une des extrémités du jonc d'arrêt 30 est positionné dans la gorge de réception 52 du piston dans laquelle il est destiné à être placé grâce au dispositif de l'invention, c'est-à-dire en débordement de la gorge 52.One of the ends of the snap ring 30 is positioned in the receiving groove 52 of the piston in which it is intended to be placed by means of the device of the invention, that is to say overflow the groove 52.

On engage ensuite l'outil de montage 1 sur le pion de centrage 20 du support 2, c'est-à-dire la partie d'extrémité 11 de l'outil sur la tige de guidage 25 du pion de centrage 20. L'opérateur saisit l'outil de montage 1 par sa partie moletée 15. En faisant descendre l'outil de montage 1 sur le pion de centrage (flèche « P »), l'outil de montage crochète, rabat et pousse le jonc d'arrêt 30 en butée contre la surface radiale 13A de l'outil 1. L'opérateur imprime également à l'outil de montage 1 un mouvement de rotation (flèche « R »), qui permet de forcer, grâce à la forme des deux collerettes 12 et 13 mentionnées précédemment, le jonc d'arrêt 30 à venir de placer dans sa gorge de réception 52. La référence 30' désigne le jonc d'arrêt en place dans sa gorge de réception 52. Le diamètre « D » de la gorge correspond au diamètre externe du jonc en position montée, donc en position serrée. La profondeur radiale de la gorge 52 est sensiblement de l'ordre du rayon du jonc d'arrêt 30.The mounting tool 1 is then engaged on the centering pin 20 of the support 2, that is to say the end portion 11 of the tool on the guide rod 25 of the centering pin 20. The operator grasps the mounting tool 1 by its knurled portion 15. By lowering the mounting tool 1 on the centering pin (arrow "P"), the mounting tool hooks, folds and pushes the snap ring 30 against the radial surface 13A of the tool 1. The operator also prints to the mounting tool 1 a rotational movement (arrow "R"), which allows to force, thanks to the shape of the two flanges 12 and 13 mentioned above, the stop ring 30 to be placed in its receiving groove 52. The reference 30 'designates the snap ring in place in its receiving groove 52. The diameter "D" of the groove corresponds the outer diameter of the ring in the mounted position, so in the tight position. The radial depth of the groove 52 is substantially of the order of the radius of the snap ring 30.

Une fois le jonc d'arrêt 30 en place dans sa gorge de réception 52, l'outil de montage 1 est remonté.Once the snap ring 30 in place in its receiving groove 52, the mounting tool 1 is reassembled.

Comme montré sur le dessin de la figure 7, il importe de noter que les surfaces d'arrêt tronquées 13C et 13D de la collerette 13 sont sensiblement inclinées par rapport au plan radial de façon à favoriser la prise du jonc d'arrêt par l'outil de montage 1.As shown on the drawing of the figure 7 , it is important to note that the truncated stop surfaces 13C and 13D of the flange 13 are substantially inclined relative to the radial plane so as to favor the setting of the snap ring by the mounting tool 1.

On notera également, en référence aux figures 5 et 9, que l'épaulement, mentionné précédemment, prévu sur l'épaulement 23 du pion de centrage 20 a pour fonction de permettre d'esquiver le premier jonc d'arrêt déjà en place dans sa gorge de réception lors du montage du second joint d'arrêt de l'axe de piston.It will also be noted, with reference to figures 5 and 9 , that the shoulder, mentioned above, provided on the shoulder 23 of the centering pin 20 has the function of allowing to dodge the first snap ring already in place in its receiving groove when mounting the second seal of stop of the piston pin.

L'outil de montage 1 du dispositif de l'invention décrit ci-dessus présente de nombreux avantages, parmi lesquels les avantages suivants :The mounting tool 1 of the device of the invention described above has many advantages, among which the following advantages:

- il permet de maintenir et d'appliquer une contrainte d'intensité progressive sur le jonc d'arrêt 30 au fur et à mesure de son engagement dans la gorge de réception 52 du piston 50,it makes it possible to maintain and apply a progressive intensity stress on the snap ring 30 as it is engaged in the receiving groove 52 of the piston 50,

- il intègre un système de guidage et d'engagement formé par les collerettes 12 et 13. Les bords 13C et 13D usinés « tête bêche » permettent de réaliser des montages dans le sens horaire (« sens « R » de la figure 9) et dans le sens antihoraire (« sens « R' » de la figure 9),- It incorporates a guiding and engagement system formed by the flanges 12 and 13. The edges 13C and 13D machined "head-to-tail" allow for assembly in the clockwise direction ("R" direction of the figure 9 ) and counterclockwise ("R" meaning of the figure 9 )

Le dispositif de l'invention décrit ci-dessus dans son ensemble facilite le montage des joncs d'arrêt et réduit leur temps de montage. Parce qu'il n'y a pas de contact direct entre le jonc d'arrêt et la main de l'opérateur de montage, ce dernier présente moins de risques de se blesser et, de plus, travaille avec moins d'efforts et, donc, de fatigue.The device of the invention described above as a whole facilitates the mounting of the snap rings and reduces their assembly time. Because there is no direct contact between the snap ring and the hand of the mounting operator, the latter presents less risk of injury and, moreover, works with less effort and, therefore, tired.

De manière générale, le dispositif de montage de joncs d'arrêt de l'invention est un dispositif de conception, de réalisation et d'utilisation plus simples que les dispositifs connus de l'art antérieur.In general, the rods mounting device of the invention is a simpler design, embodiment and use device than the known devices of the prior art.

Claims (10)

  1. A device for facilitating the mounting of a snap ring (30) of a piston pin (60) of a vehicle engine, in particular of a motor vehicle engine, characterized in that it comprises:
    • a piston support (2), which has a means for placing in position of the piston along a direction such that the piston pin is substantially vertical, and
    • a mounting tool (1), intended to push the snap ring (30) progressively in its receiving groove (52) provided in the piston, the said mounting tool (1) having a guidance and engagement system (12, 13) of the said snap ring (30) which hooks, lowers and pushes the snap ring (30) during the downward and rotational movement of the mounting tool (1) until the snap ring (30) comes to be housed in the said receiving groove (52).
  2. The device according to claim 1, characterized in that the said guidance and engagement system of the snap ring (30) in its receiving groove (52) is formed by two coaxial adjacent collars, projecting radially from the mounting tool (1), a first collar or "large collar" (13), of greater diameter than the second collar (12), extending angularly over an incomplete circumference, leaving a truncated angular sector of an angle comprised between 80° and 90°; and the said second collar (12) having in this truncated angular sector a reduction in radius ("e") substantially in the order of the diameter of the section ("d") of the snap ring (30), so as to permit the taking of the snap ring (30) by the mounting tool (1).
  3. The device according to claim 1, characterized in that the said means for placing in position of the piston along a direction such that the piston pin is substantially vertical is constituted by a centring dowel (20) fixed on the surface (2A) of the support (2), the said centring dowel having a shoulder (27) intended to receive a lateral end face of the piston (50).
  4. The device according to claim 1, characterized in that the said mounting tool (1), intended to push the snap ring (30) progressively in its receiving groove (52), includes a cylindrical end part (11) including an axial bore which cooperates with an end rod (25) of the centring dowel (20) to guide the movements of the mounting tool (1) during the mounting of the snap ring (30).
  5. The device according to claim 4, characterized in that the said end rod (25) of the centring dowel is mounted in a screwed manner on the centring dowel (20).
  6. The device according to claim 2, characterized in that the diameter (12A) of the second collar (12) is substantially equal to the internal diameter of the snap ring (30) in mounted position in its receiving groove (52).
  7. The device according to any one of claims 1 to 6, characterized in that the snap ring is of circular section with a diameter close to 1.4 mm.
  8. The device according to claims 2 and 7, characterized in that the radius of the large collar (13) is greater than the radius of the other collar (12) by a value substantially equal to the radius ("d/2") of the circular section of the snap ring (30).
  9. The device according to claim 3, characterized in that the said centring dowel (20) has a shoulder (24) of its upper lateral surface beyond the guide rod, which shoulder (24) permits evading of the first snap ring (30) already in place in its receiving groove during the mounting of the second snap ring of the piston pin (60).
  10. A method for mounting a snap ring (30) of a piston pin (60) of a vehicle engine by means of the device according to claim 1, in particular of a motor vehicle engine, characterized by the following steps, taken in combination:
    • the piston (50) and its piston pin (60) are placed on the piston support (20), such that the lower lateral surface of the piston (60) comes to abut on the radial support surface (27) defined by the shoulder (23) of the centring dowel (20),
    • the snap ring (30) is placed with overlapping of the receiving groove (52) of the piston in which it is intended to be placed,
    • the mounting tool (1) is engaged on the centring dowel (20) of the support (2),
    • the mounting tool (1) is lowered, well positioned as a function of the position of the snap ring (30) and then it is given a rotational movement, so as to hook, lower and push the snap ring towards the receiving groove (52),
    • once the snap ring (30) is in place in its receiving groove (52), the mounting tool (1) is raised again.
EP12173504.7A 2011-07-01 2012-06-26 Device for facilitating the mounting of the snap rings of a piston pin of a vehicle engine Active EP2540446B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1155979A FR2977179B1 (en) 2011-07-01 2011-07-01 DEVICE FOR FACILITATING THE MOUNTING OF THE STOP LEGS OF A VEHICLE MOTOR PISTON AXIS

Publications (2)

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EP2540446A1 EP2540446A1 (en) 2013-01-02
EP2540446B1 true EP2540446B1 (en) 2014-08-27

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EP (1) EP2540446B1 (en)
FR (1) FR2977179B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9908225B2 (en) 2015-03-13 2018-03-06 Caterpillar Inc. Method and tool for installation of retainer ring
CN104858635B (en) * 2015-06-06 2017-03-08 东莞市元鹏五金电子科技有限公司 A kind of trigger clamping rotating disk carrier device of elastic hook

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2357139A (en) 1943-07-01 1944-08-29 Jack & Heintz Inc Snap ring assembling tool
DE3041260C2 (en) * 1980-11-03 1983-10-27 Daimler-Benz Ag, 7000 Stuttgart Assembly device for elastic rings, in particular round cord rings
FR2649349A1 (en) * 1989-07-04 1991-01-11 Rafer Sa Device allowing the automatic insertion of circlips into grooves made internally or externally on cylindrical bodies
US6507985B1 (en) * 2000-03-08 2003-01-21 Daimlerchrysler Corporation Snap ring installation tool and method
JP4223453B2 (en) * 2004-09-21 2009-02-12 本田技研工業株式会社 C-shaped clip mounting jig

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EP2540446A1 (en) 2013-01-02
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