FR2838492A1 - Drum roller for combustion engine distribution belt comprises several right cylinders spaced eccentrically in axial direction with respective axes parallel to principal axis - Google Patents
Drum roller for combustion engine distribution belt comprises several right cylinders spaced eccentrically in axial direction with respective axes parallel to principal axis Download PDFInfo
- Publication number
- FR2838492A1 FR2838492A1 FR0204723A FR0204723A FR2838492A1 FR 2838492 A1 FR2838492 A1 FR 2838492A1 FR 0204723 A FR0204723 A FR 0204723A FR 0204723 A FR0204723 A FR 0204723A FR 2838492 A1 FR2838492 A1 FR 2838492A1
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- FR
- France
- Prior art keywords
- cylinders
- roller
- main axis
- oblique
- straight
- 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.)
- Granted
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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
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/18—Means for guiding or supporting belts, ropes, or chains
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/024—Belt drive
-
- 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
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0863—Finally actuated members, e.g. constructional details thereof
- F16H2007/0865—Pulleys
-
- 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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/0006—Vibration-damping or noise reducing means specially adapted for gearings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
Description
1 28384921 2838492
Galet enrouleur pour courroie de distribution de moteur à combustion. La présente invention concerne un galet enrouleur ou un galet tendeur, du type utilisé sur un parcours d'entraînement distribution par courroie crantée dans un moteur à combustion de véhicule automobile. L'invention a pour objectif, de façon générale, de proposer un galet enrouleur ou un galet tendeur qui assure une bonne prestation acoustique de l'entrâînement distribution tout en garantissant la Roller reel for timing belt of combustion engine. The present invention relates to a winding roller or a tensioner roller, of the type used on a distribution drive path by toothed belt in a combustion engine of a motor vehicle. The object of the invention is, in general, to propose a winding roller or a tensioning roller which ensures good acoustic performance of the drive distribution while guaranteeing the
fiabilité de cette fonction.reliability of this function.
On a constaté en effet que lors de l'entrâînement de la distribution d'un moteur à combustion par une courroie crantée, il se produit des It has in fact been observed that during the driving of the distribution of a combustion engine by a toothed belt, there are produced
bruits parasites, nuisibles pour le confort des occupants du véhicule. noise, harmful to the comfort of vehicle occupants.
Ces bruits résultent des tensions dynamiques élevées que subissent les These noises result from the high dynamic tensions which the
brins de la courroie.belt strands.
Différentes solutions ont été proposées pour réduire ces bruits. Par exemple, le brevet DE 4 304 829 prévoit de former dans la partie médiane du galet un bourrelet annulaire de largeur inférieure à celle d'un galet et qui se raccorde aux deux portions marginales du galet par des gradins. I1 en résulte que la courroie, qui a une largeur sensiblement égale à celle du galet, repose sur le bourrelet et que ses bords longitudinaux s'incurvent pour venir en appui sur les portions marginales du galet, situées de part et d'autre du bourrelet. Par contre, la courroie comporte des portions sans contact avec le galet, à savoir celles qui se trouvent au-dessus d'espaces formés de part et d'autre des gradins. Cette réduction de la surface de contact entre la courroie et la piste du galet entraîne une répartition inhomogène des excitations du câblé de la courroie, ce qui favorise la réduction de la transmission vibratoire et du rayonnement acoustique de l'ensemble. Toutefois, en raison de la concentration des contraintes qui existent sur les zones de la courroie qui sont en contact avec les arêtes du bourrelet, il y a un risque de Different solutions have been proposed to reduce these noises. For example, patent DE 4,304,829 provides for forming in the middle part of the roller an annular bead of width less than that of a roller and which is connected to the two marginal portions of the roller by steps. I1 follows that the belt, which has a width substantially equal to that of the roller, rests on the bead and that its longitudinal edges curve to come to bear on the marginal portions of the roller, located on either side of the bead . By cons, the belt has portions without contact with the roller, namely those which are above spaces formed on either side of the steps. This reduction in the contact surface between the belt and the track of the roller leads to an inhomogeneous distribution of the excitations of the cable of the belt, which favors the reduction of the vibratory transmission and the acoustic radiation of the whole. However, due to the concentration of stresses which exist on the areas of the belt which are in contact with the edges of the bead, there is a risk of
détérioration du dos de la courroie et de perte de fiabilité de sa fonction. deterioration of the back of the belt and loss of reliability of its function.
On connâît d'autre part, par le brevet 2 780 473 déposé par la même Demanderesse, un galet tendeur basé sur le même principe de la répartition inhomogène des excitations. Ce galet est constitué d'un empilement de disques ayant un axe commun et deux diamètres On the other hand, we know from patent 2,780,473 filed by the same Applicant, a tensioner roller based on the same principle of the inhomogeneous distribution of excitations. This roller consists of a stack of discs having a common axis and two diameters
2 28384922 2838492
différents alternés. Ce galet a une bonne fiabilité de la fonction entrainement distribution, mais ses performances acoustiques sont médiocres. Dans un second mode de réalisation, le galet est constitué d'un empilement de disques de méme diamètre, mais excentrés les uns par rapport aux autres. Ce galet permet certes d'obtenir une bonne prestation acoustique en raison de la variation des longueurs de brins de la courroie adjacents au galet et d'éviter ainsi une excitation trop précise sur les fréquences de résonance des brins, mais la fiabilité de la fonction entrainement distribution de ce galet est médiocre, car au bout lO de quelques heures de rotation du moteur, la courroie est lacérée par different alternates. This roller has a good reliability of the distribution drive function, but its acoustic performance is poor. In a second embodiment, the roller consists of a stack of disks of the same diameter, but offset from one another. This roller certainly allows to obtain a good acoustic performance due to the variation of the lengths of strands of the belt adjacent to the roller and thus to avoid too precise excitation on the resonance frequencies of the strands, but the reliability of the drive function. distribution of this roller is poor, because after 10 hours of engine rotation, the belt is lacerated by
les arétes vives des disques excentrés. the sharp edges of the eccentric discs.
La présente invention vise à remédier aux inconvénients des galets de la technique antérieure en proposant un galet enrouleur ou tendeur qui ait à la fois une bonne fiabilité de la fonction entrainement The present invention aims to remedy the drawbacks of rollers of the prior art by proposing a winding roller or tensioner which has both good reliability of the drive function
distribution et une excellente prestation acoustique. distribution and excellent acoustic performance.
A cet effet, le galet selon l' invention e st caractérisé en ce qu ' il comprend une surface latérale construite autour d'un axe principal et comprenant: plusieurs cylindres droits espacés les uns des autres dans le sens axial et excentrés de manière que leurs axes respectifs soient parallèles audit axe principal et se trouvent, lorsqu'on observe le galet à partir d'une extrémité, aux sommets d'un carré dont le centre est constitué par la trace de l'axe principal, et plusieurs cylindres obliques qui relient entre eux les cylindres droits, les zones de liaison entre les cylindres droits et les cylindres obliques étant arrondies et dépourvues d'arétes vives. La disposition en carré des axes des cylindres droits autour de To this end, the roller according to the invention is characterized in that it comprises a lateral surface constructed around a main axis and comprising: several straight cylinders spaced apart from each other in the axial direction and offset so that their respective axes are parallel to said main axis and are found, when we observe the roller from one end, at the vertices of a square whose center is formed by the trace of the main axis, and several oblique cylinders which connect between them the straight cylinders, the connecting zones between the straight cylinders and the oblique cylinders being rounded and devoid of sharp edges. The square arrangement of the axes of the straight cylinders around
l' axe principal permet de donner la méme excentricité auxdits cylindres. the main axis makes it possible to give the same eccentricity to said cylinders.
I1 en résulte une variation de la longueur des brins de courroie qui est en contact avec le galet et donc une réduction de la propagation vibratoire le long de la courroie. Cette disposition en carré a également pour effet d'éviter le contact uniforme entre la courroie et la piste du galet et d' assurer une répartition inhomogène des efforts de la piste sur This results in a variation in the length of the strands of the belt which is in contact with the roller and therefore a reduction in the vibratory propagation along the belt. This square arrangement also has the effect of avoiding uniform contact between the belt and the track of the roller and of ensuring an inhomogeneous distribution of the forces of the track over
la courroie.the belt.
L'invention deviendra plus claire à la lecture de la description d'un The invention will become clearer on reading the description of a
mode de réalisation qui va suivre, faite en regard du dessin annexé dans lequel: embodiment which will follow, made with reference to the appended drawing in which:
3 28384923 2838492
la figure 1 est une vue en bout d'un galet selon l'invention; la figure 2 est une vue à plus grande échelle d'un détail de la figure 1, montrant la répartition des axes des cylindres droits et des cylindres obliques autour de l'axe principal; la figure 3 est une vue en perspective montrant la disposition spatiale des axes des cylindres droits et des cylindres obliques du galet; la figure 4 est une vue partielle en perspective du galet, dans laquelle certaines dimensions ont été fortement exagérées pour mieux se représenter la structure du galet et montrant, pour la simplicité de la figure, seulement deux cylindres droits et le cylindre oblique qui les relie; et la figure 5 représente les variations du niveau acoustique en fonction de la vitesse de rotation du moteur, dans le cas d'un galet Figure 1 is an end view of a roller according to the invention; Figure 2 is an enlarged view of a detail of Figure 1, showing the distribution of the axes of straight cylinders and oblique cylinders around the main axis; Figure 3 is a perspective view showing the spatial arrangement of the axes of the straight cylinders and the oblique rollers of the roller; Figure 4 is a partial perspective view of the roller, in which certain dimensions have been greatly exaggerated to better represent the structure of the roller and showing, for the simplicity of the figure, only two straight cylinders and the oblique cylinder which connects them; and FIG. 5 represents the variations in the acoustic level as a function of the speed of rotation of the motor, in the case of a roller
selon la technique antérieure et d'un galet selon l'invention. according to the prior art and a roller according to the invention.
Le galet selon l'invention a une paroi latérale de forme complexe formoe d'une succession de cylindres droits reliés par des cylindres obliques. Avec rétérence aux figures 1 à 4, le galet 10 comprend une surface latérale organisée autour d'un axe principal 12. Cette surface est formoe d'une succession de cylindres droits 14, 16, 18, 20 de diamètres donnés et de longueurs données, dont les axes respectifs 22, 24, 26, 28 sont parallèles à l'axe principal 12. Les cylindres sont espacés les uns des autres dans le sens de l'axe principal et leurs axes sont excentrés par rapport à l'axe principal d'une distance e de manière à ce que, comme le montrent les figures 1 et 2, lorsque l'on regarde le galet à partir d'une extrémité, lesdits axes se trouvent aux sommets d'un carré dont le centre est l'axe principal. On désignera cette disposition des axes par The roller according to the invention has a side wall of complex shape formed by a succession of straight cylinders connected by oblique cylinders. With reference to FIGS. 1 to 4, the roller 10 comprises a lateral surface organized around a main axis 12. This surface is formed by a succession of straight cylinders 14, 16, 18, 20 of given diameters and given lengths, whose respective axes 22, 24, 26, 28 are parallel to the main axis 12. The cylinders are spaced from each other in the direction of the main axis and their axes are eccentric relative to the main axis of a distance e so that, as shown in Figures 1 and 2, when looking at the roller from one end, said axes are located at the vertices of a square whose center is the main axis . This arrangement of axes will be designated by
disposition en hélice carrée ou en manivelle. square helix or crank arrangement.
On rappelle que la section d'un cylindre droit par un plan perpendiculaire à son axe est un cercle. C'est le cas en particulier des It is recalled that the section of a right cylinder by a plane perpendicular to its axis is a circle. This is particularly the case for
extrémités de chacun des cylindres droits 14, 16, 18, 20. ends of each of the straight cylinders 14, 16, 18, 20.
Les cylindres droits sont reliés entre eux par des cylindres obliques , 32, 34 dont les axes 36, 38, 40 relient les extrémités des axes 22, 24, 26, 28 des cylindres droits voisins. Les sections des cylindres obliques par des plans perpendiculaires à l'axe principal 12 sont circulaires et de méme diamètre que celui des cylindres droits, ce qui permet aux cylindres obliques de se raccorder exactement aux The straight cylinders are interconnected by oblique cylinders, 32, 34 whose axes 36, 38, 40 connect the ends of the axes 22, 24, 26, 28 of the neighboring straight cylinders. The sections of the oblique cylinders by planes perpendicular to the main axis 12 are circular and of the same diameter as that of the straight cylinders, which allows the oblique cylinders to be connected exactly to the
4 28384924 2838492
extrémités circulaires des cylindres droits, tandis que leurs sections par circular ends of straight cylinders, while their sections through
des plans perpendiculaires à leur propre axe 36, 38, 40 sont elliptiques. planes perpendicular to their own axis 36, 38, 40 are elliptical.
Sur les figures 1 et 4, on a représenté les cylindres droits avec le même diamètre D, la même longueur d et le même écartement 1 entre cylindres successifs. De même, l'excentricité e a été représentée identique pour tous les axes 22, 24, 26, 28. Cependant, dans des variantes de réalisation, toutes ces dimensions peuvent varier d'un In FIGS. 1 and 4, the straight cylinders are shown with the same diameter D, the same length d and the same spacing 1 between successive cylinders. Likewise, the eccentricity e has been shown to be identical for all the axes 22, 24, 26, 28. However, in alternative embodiments, all these dimensions may vary by
cylindre droit à l'autre.cylinder right to the other.
Avantageusement, les cylindres obliques se raccordent aux cylindres droits par des zones arrondies afin que la surface latérale du Advantageously, the oblique cylinders are connected to the straight cylinders by rounded zones so that the lateral surface of the
galet soit fluide et sans arête vive. roller is fluid and without sharp edge.
Le galet a globalement une forme sensiblement cylindrique et si cette forme n'est pas perceptible sur la figure 4, c'est parce que l'on a intentionnellement exagéré l'excentricité e, afin de bien faire ressortir les positions des cylindres les uns par rapport aux autres. En réalité, le diamètre est de l'ordre de quelques centimètres, d et 1 sont de l'ordre de The roller generally has a substantially cylindrical shape and if this shape is not perceptible in FIG. 4, it is because we have intentionally exaggerated the eccentricity e, in order to clearly highlight the positions of the cylinders by compared to others. In reality, the diameter is of the order of a few centimeters, d and 1 are of the order of
quelques millimètres et e est de l'ordre du millimètre. a few millimeters and e is of the order of a millimeter.
On donnera ci-après, seulement à titre illustratif, un exemple An example will be given below, by way of illustration only.
pratique de réalisation du galet selon l'invention. practice of making the roller according to the invention.
Les cylindres droits ont un diamètre de 54 mm, une longueur de mm et sont espacés les uns des autres de 4 mm. Leurs axes sont excentrés par rapport à l'axe principal de 0,5 mm. Le rayon de courbure The straight cylinders have a diameter of 54 mm, a length of mm and are spaced from each other by 4 mm. Their axes are offset from the main axis by 0.5 mm. The radius of curvature
des zones de raccordement est de 10 mm. connection areas is 10 mm.
Lors d'essais de caractérisation dynamique et d'essais acoustiques de ce galet, aucune détérioration de la courroie n'a été observée au bout During dynamic characterization and acoustic tests of this roller, no deterioration of the belt was observed at the end.
de quelques heures de rotation du moteur. a few hours of engine rotation.
La figure 5 montre les performances comparées d'un galet selon la technique antérieure (en trait continu) et du galet selon l'invention (en traits tiretés). La vitesse de rotation du moteur est portée en abscisses et le niveau de pression acoustique en ordonnées. On constate qu'à certains régimes critiques (2 400 <N< 2 600 tours/mn), le gain sur le niveau de pression acoustique au droit d'un brin de courroie peut atteindre 15 d B. FIG. 5 shows the compared performances of a roller according to the prior art (in solid line) and of the roller according to the invention (in dashed lines). The engine rotation speed is plotted on the abscissa and the sound pressure level on the ordinate. It can be seen that at certain critical speeds (2,400 <N <2,600 rpm), the gain on the sound pressure level in line with a strand of belt can reach 15 d B.
28384922838492
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0204723A FR2838492B1 (en) | 2002-04-16 | 2002-04-16 | REEL ROLLER FOR COMBUSTION ENGINE TIMING BELT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0204723A FR2838492B1 (en) | 2002-04-16 | 2002-04-16 | REEL ROLLER FOR COMBUSTION ENGINE TIMING BELT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2838492A1 true FR2838492A1 (en) | 2003-10-17 |
| FR2838492B1 FR2838492B1 (en) | 2004-06-04 |
Family
ID=28459869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0204723A Expired - Fee Related FR2838492B1 (en) | 2002-04-16 | 2002-04-16 | REEL ROLLER FOR COMBUSTION ENGINE TIMING BELT |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2838492B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9709137B2 (en) | 2012-12-26 | 2017-07-18 | Litens Automotive Partnership | Orbital tensioner assembly |
| US10520066B2 (en) | 2014-06-26 | 2019-12-31 | Litens Automotive Partnership | Orbital tensioner assembly |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04102755A (en) * | 1990-08-18 | 1992-04-03 | Toyota Motor Corp | Resin made pulley |
| DE4304829A1 (en) | 1993-02-17 | 1994-08-25 | Schaeffler Waelzlager Kg | Timing gear for an internal combustion engine |
| DE19515351A1 (en) * | 1994-05-04 | 1995-11-09 | Volkswagen Ag | Diverting roller for belt drive |
| EP0967416A1 (en) * | 1998-06-26 | 1999-12-29 | Renault | Pulley for guiding and/or tensioning a transmission belt |
-
2002
- 2002-04-16 FR FR0204723A patent/FR2838492B1/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04102755A (en) * | 1990-08-18 | 1992-04-03 | Toyota Motor Corp | Resin made pulley |
| DE4304829A1 (en) | 1993-02-17 | 1994-08-25 | Schaeffler Waelzlager Kg | Timing gear for an internal combustion engine |
| DE19515351A1 (en) * | 1994-05-04 | 1995-11-09 | Volkswagen Ag | Diverting roller for belt drive |
| EP0967416A1 (en) * | 1998-06-26 | 1999-12-29 | Renault | Pulley for guiding and/or tensioning a transmission belt |
| FR2780473A1 (en) | 1998-06-26 | 1999-12-31 | Renault | TIMING BELT TENSIONER OF MOTOR VEHICLE COMBUSTION ENGINE |
Non-Patent Citations (2)
| Title |
|---|
| BOETTGER A ET AL: "RIEMENGETRIEBE, GERAEUSCHMINDERUNG, ANTRIEBSTECHNIK. ÖTEILUNG KORRIGIERT - LAERM REDUZIERT. GERAEUSCHE AN ZAHNRIEMENGETRIEBEN, URSACHEN UND PRIMAERE GEGENMASSNAHMEN", KONSTRUKTION, SPRINGER-VERLAG. BERLIN, DE, vol. 45, no. 9, 1993, pages 275 - 278, XP000195239 * |
| PATENT ABSTRACTS OF JAPAN vol. 016, no. 343 (M - 1285) 24 July 1992 (1992-07-24) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9709137B2 (en) | 2012-12-26 | 2017-07-18 | Litens Automotive Partnership | Orbital tensioner assembly |
| US10309497B2 (en) | 2012-12-26 | 2019-06-04 | Litens Automotive Partnership | Orbital tensioner assembly |
| US11078993B2 (en) | 2012-12-26 | 2021-08-03 | Litens Automotive Partnership | Orbital tensioner assembly |
| US10520066B2 (en) | 2014-06-26 | 2019-12-31 | Litens Automotive Partnership | Orbital tensioner assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2838492B1 (en) | 2004-06-04 |
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