FR2573157A1 - Improved ring-belt system for a speed reduction gear with a trapezoidal belt - Google Patents
Improved ring-belt system for a speed reduction gear with a trapezoidal belt Download PDFInfo
- Publication number
- FR2573157A1 FR2573157A1 FR8417396A FR8417396A FR2573157A1 FR 2573157 A1 FR2573157 A1 FR 2573157A1 FR 8417396 A FR8417396 A FR 8417396A FR 8417396 A FR8417396 A FR 8417396A FR 2573157 A1 FR2573157 A1 FR 2573157A1
- Authority
- FR
- France
- Prior art keywords
- belt
- flanges
- ring
- hub
- face
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/52—Pulleys or friction discs of adjustable construction
- F16H55/56—Pulleys or friction discs of adjustable construction of which the bearing parts are relatively axially adjustable
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmissions By Endless Flexible Members (AREA)
- Pulleys (AREA)
Abstract
Description
Systlme bague-courroie perfectionné pour variateur de vitesse à courroie tropéroïdale.Advanced belt-ring system for tropoidal belt drive.
L'invention concerne le système bague-courroie d'un variateur de vitesse à courroie trapézofdale du type comprenant deux flasques solidaires en rotation d'un moyeu, l'un des flasques tant rixe en translation et l'autre mobile par rapport au moyeu, les deux flasques définissant une gorge variable au fond de laquelle une bague montée toile sur le moyeu est prévue @ pour recevoir sur sa face extérieure la face intérieure de la courroie lorsque les flasques sont écartés l'un de l'autre en position de débrayage. The invention relates to the ring-belt system of a speed variator with a trapezoidal belt of the type comprising two flanges integral in rotation with a hub, one of the flanges both fixed in translation and the other movable relative to the hub, the two flanges defining a variable groove at the bottom of which a ring mounted canvas on the hub is provided @ to receive on its outer face the inner face of the belt when the flanges are separated from one another in the disengaged position.
Un tel système bague-courroie est connu par exemple par le brevet US-A-255350S. On sait que ce système est destina à éviter que la courroie, qui doit rester immobile en position débrayée, ne vienne trotter contre le moyeu qui continue à tourner. Such a ring-belt system is known for example from US-A-255350S. We know that this system is intended to prevent the belt, which must remain stationary in the disengaged position, from trotting against the hub which continues to rotate.
Quoique ce système soit, dans son principe, parfaltement correct, la Demanderesse a constaté que aon application ne donnait généralement pas entièrement satisfaction : elle s'est en est aperçu que ce système n'empêchait pas toujours un certain entraînement de la courroie, et par conséquent un entraînement de la botte de vitesse (avant, neutre, arrière) qui se trouve on aval, rendant alors difficile toute section. Although this system is, in principle, perfectly correct, the Applicant has found that its application was generally not entirely satisfactory: it realized that this system did not always prevent a certain drive of the belt, and by Consequently a drive of the speed boot (front, neutral, rear) which is downstream, making any section difficult.
Le but de l'invention est de remédier à cet inconvénient et donc de proposer un système bague-courroie perfectiionné garantissant l'absence d'entraînement de la courroie on position débrayée, sans grever abusivement le coût du système. The object of the invention is to remedy this drawback and therefore to propose an improved ring-belt system guaranteeing the absence of drive of the belt in the disengaged position, without excessively increasing the cost of the system.
L'invention atteint son but grâce au rait que la face extérieure de la bague et la tace intérieure de la courroie comportent dea profils circonférentiels complémentaires de blocage en tranalation. Ces profils peuvent être constitués d'une collerette et d'une rainure prévues respectivement sur la bague et la courroie ou inversement. The invention achieves its object thanks to the fact that the outer face of the ring and the inner surface of the belt comprise additional circumferential profiles for blocking in tranalation. These profiles may consist of a flange and a groove provided respectively on the ring and the belt or vice versa.
Des études menées par la Demanderesse ont en effet permis de mieux comprendre les causes des inconvénients rencontrés sur les variateurs existant à ce jour : les courroies, pour des raisons inhérentes à leur fabrication, ne s'inscrivent pas rigoureusement dans un plan parfait mais ont au contraire toujours une tendance à vriller à gauche ou droite, ce qui les fait trotter sur un des flasques de la poulie. Celle-ci tournant à une vitesse relativement élevée (de l'ordure de lOOOtr/min pour un moteur à quatre temps et pouvant aller jusqu'à 2000tr/min pour un moteur à deux temps), ce frottement suffit à entratner la courroie. Studies carried out by the Applicant have indeed made it possible to better understand the causes of the drawbacks encountered on variators existing to date: the belts, for reasons inherent in their manufacture, do not strictly follow a perfect plan but have at least always a tendency to twist left or right, which makes them trot on one of the flanges of the pulley. Since the latter rotates at a relatively high speed (of the order of lOOOtr / min for a four-stroke engine and up to 2000 rpm for a two-stroke engine), this friction is sufficient to drive the belt.
La meaure propose par l'invention, quoique d'exécution très simple et peu couteuse, permet de parfaitement centrer la courroie entre les de"x flasques et ainsi de l'immobiliser en la désolidarisant totalement de la poulie en rotation. The meaure proposed by the invention, although very simple and inexpensive to execute, allows the belt to be perfectly centered between the flanges and thus to immobilize it by completely dissociating it from the rotating pulley.
L'invention sera mieux comprise à la lecture de la description suivante d'un exemple particulier et non limitatif de réalisation. Il est fait référence à la figure unique annexée qui représente en coupe axiale le variateur de l'invention, respectivement au diamètre maximum d'enroulement de la courroie pour la demi-coupe inférieure et au diamètre minimum pour la demicoupe aupérieure. The invention will be better understood on reading the following description of a particular and non-limiting example of embodiment. Reference is made to the single appended figure which represents in axial section the variator of the invention, respectively at the maximum winding diameter of the belt for the lower half-cut and at the minimum diameter for the upper half-cut.
Le variateur comporte un moyeu 4 fixé en bout d'arbre 9, un flasque fixe 1 aolidaire du moyeu, et un flas. a mobile 2 solidaire en rotation du moyeu mais libre en translation axiale pour faire varier le diamètre d'enroulement de la courroie 8 dans la gorge de largeur variable définie par ces deux flasques. A l'emplacement du fond de cette gorge le moyeu porte une bague 10 pouvant être réalisée dans diverses matières, tournant librement, sur laquelle peut venir reposer la courroie en position débrayée, le flasque mobile étant écarté de la poulie. Un chambrage 3 eat prévu dans le flasque mobile pour loger cette bague 10 en posltion rapprochée du flasque. The variator comprises a hub 4 fixed at the end of the shaft 9, a fixed flange 1 integral with the hub, and a flange. a mobile 2 integral in rotation with the hub but free in axial translation to vary the winding diameter of the belt 8 in the groove of variable width defined by these two flanges. At the location of the bottom of this groove, the hub carries a ring 10 which can be produced in various materials, freely rotating, on which the belt can come to rest in the disengaged position, the movable flange being separated from the pulley. A recess 3 is provided in the movable flange to accommodate this ring 10 in close position to the flange.
Cette bague est retenue sur le moyeu par un épaulement du moyeu et un clip 5, et comporte une collerette de section rectangulaire dans sa partie centrale. La forme de cette collerette se retrouve sur la partie centrale de la face intérieue de la courroie sous la forme complémentaire d'une rainure 11. This ring is retained on the hub by a shoulder of the hub and a clip 5, and comprises a collar of rectangular section in its central part. The shape of this flange is found on the central part of the interior face of the belt in the complementary form of a groove 11.
Ainsi, lorsque la vitesse de rotation diminue, la courroie 9 redescend dans la gorge et vient se centrer automatiquement sur la bague 10 par l'intermédiaire de la rainure il qui vient épouser la forme de la collerette 7, rendant impossible tout frottement sur l'un ou l'autre des flasques. Thus, when the speed of rotation decreases, the belt 9 descends into the groove and comes to center itself automatically on the ring 10 by means of the groove il which comes to conform to the shape of the flange 7, making any friction on the one or the other of the flanges.
Il est important de noter queune fois la courrote posée -sur la bague, courroie et bague sont immobiles l'une par rapport à l'autre il n'y a donc aucun problème d'usure ou de déformation pour la rainure 11 de la courroie. It is important to note that once the belt is placed - on the ring, belt and ring are stationary relative to each other so there is no problem of wear or deformation for the groove 11 of the belt .
Au contraire, le mouvement se fait entre le moyeu 4 et la bague 10 qui peut être montée sur un roulement à åiguilles 6. On the contrary, the movement takes place between the hub 4 and the ring 10 which can be mounted on a needle bearing 6.
Il est même possible de donner directement à la cage du roulement la forme de la collerette désirée, ce qui simplifie beaucoup les opérations d'assemblage et abaisse le prix de revient.It is even possible to give the bearing cage directly the shape of the desired collar, which greatly simplifies the assembly operations and lowers the cost price.
Au ralenti, la grande précision de positionnement de la courroie permet également de diminuer le jeu entre les flasques et la courroie : l'embrayage devient donc beaucoup plus progressif car le flasque mobile étant très tôt au contact de la courroie, y arrive avec une vitesse axiale plus faible. At idle, the high positioning accuracy of the belt also makes it possible to reduce the clearance between the flanges and the belt: the clutch therefore becomes much more progressive since the movable flange being very early in contact with the belt, arrives there with speed weaker axial.
Il est également envisageable de mettre la collerette sur la courroie et la rainure sur la bague. It is also possible to put the collar on the belt and the groove on the ring.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8417396A FR2573157B1 (en) | 1984-11-14 | 1984-11-14 | IMPROVED BELT-RING SYSTEM FOR A SPEED DRIVE WITH A TRAPEZOIDAL BELT |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8417396A FR2573157B1 (en) | 1984-11-14 | 1984-11-14 | IMPROVED BELT-RING SYSTEM FOR A SPEED DRIVE WITH A TRAPEZOIDAL BELT |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2573157A1 true FR2573157A1 (en) | 1986-05-16 |
FR2573157B1 FR2573157B1 (en) | 1989-12-15 |
Family
ID=9309602
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8417396A Expired FR2573157B1 (en) | 1984-11-14 | 1984-11-14 | IMPROVED BELT-RING SYSTEM FOR A SPEED DRIVE WITH A TRAPEZOIDAL BELT |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2573157B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2671596A1 (en) * | 1991-01-16 | 1992-07-17 | Ibc Europ Eurl | AUTOMATIC SPEED DRIVE PULLEY. |
FR2877037A1 (en) | 2004-10-27 | 2006-04-28 | Renault Sas | Oil pump driving device for internal combustion engine, has grooved pulleys with flanges whose space is variable and adjusted by actuators subjugated to oil temperature, and controller driving oil pump based on driving ratio |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR336983A (en) * | 1903-11-05 | 1904-03-22 | Eugene Werner | Clutch and disengagement device for motorcycles and other applications |
US2553505A (en) * | 1949-03-17 | 1951-05-15 | Charles H Miner | Centrifugally controlled device |
FR1102759A (en) * | 1953-06-27 | 1955-10-25 | Class Geb | Pulley-speed variator |
-
1984
- 1984-11-14 FR FR8417396A patent/FR2573157B1/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR336983A (en) * | 1903-11-05 | 1904-03-22 | Eugene Werner | Clutch and disengagement device for motorcycles and other applications |
US2553505A (en) * | 1949-03-17 | 1951-05-15 | Charles H Miner | Centrifugally controlled device |
FR1102759A (en) * | 1953-06-27 | 1955-10-25 | Class Geb | Pulley-speed variator |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2671596A1 (en) * | 1991-01-16 | 1992-07-17 | Ibc Europ Eurl | AUTOMATIC SPEED DRIVE PULLEY. |
EP0495740A1 (en) * | 1991-01-16 | 1992-07-22 | Société Canadienne POWERBLOC IBC Canada | Pulley for a speed variator |
FR2877037A1 (en) | 2004-10-27 | 2006-04-28 | Renault Sas | Oil pump driving device for internal combustion engine, has grooved pulleys with flanges whose space is variable and adjusted by actuators subjugated to oil temperature, and controller driving oil pump based on driving ratio |
Also Published As
Publication number | Publication date |
---|---|
FR2573157B1 (en) | 1989-12-15 |
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