FR2889865A1 - Variable-speed drive unit for e.g. riding mower, has manual control element drawing together or separating flanges that are able to exert slight control effort corresponding to difference in power of loading devices on flanges - Google Patents
Variable-speed drive unit for e.g. riding mower, has manual control element drawing together or separating flanges that are able to exert slight control effort corresponding to difference in power of loading devices on flanges Download PDFInfo
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- FR2889865A1 FR2889865A1 FR0508094A FR0508094A FR2889865A1 FR 2889865 A1 FR2889865 A1 FR 2889865A1 FR 0508094 A FR0508094 A FR 0508094A FR 0508094 A FR0508094 A FR 0508094A FR 2889865 A1 FR2889865 A1 FR 2889865A1
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- France
- Prior art keywords
- flanges
- pulley
- flange
- pulleys
- variable speed
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Classifications
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- 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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- 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
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/04—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism
- F16H63/06—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism the final output mechanism having an indefinite number of positions
- F16H63/067—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism the final output mechanism having an indefinite number of positions mechanical actuating means
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- 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
- F16H9/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members
- F16H9/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion
- F16H9/04—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes
- F16H9/12—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members
- F16H9/16—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members using two pulleys, both built-up out of adjustable conical parts
- F16H9/18—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members using two pulleys, both built-up out of adjustable conical parts only one flange of each pulley being adjustable
Abstract
Description
Variateur de vitesse à courroie et engin automoteur à vitesse d'avancementBelt speed variator and self-propelled speeding machine
variable équipé d'un tel variateur variable equipped with such a variator
La présente invention concerne un variateur de vitesse à courroie, du type comportant au moins deux poulies à flasques à écartement variable ainsi qu'un io engin automoteur à vitesse d'avancement variable, tel qu'une tondeuse à gazon, équipé d'un tel variateur. The present invention relates to a belt speed variator, of the type comprising at least two variable-gauge flanged pulleys and a self-propelled machine with a variable forward speed, such as a lawn mower, equipped with such a device. drive.
Les variateurs de vitesse, constitués d'une transmission à courroie entre une poulie motrice et une poulie menée, appliqués notamment à des engins automoteurs à vitesse d'avancement variable, tels que tondeuse à gazon, sont bien connus à ceux versés dans cet art comme l'illustrent en particulier le brevet FR-A-2.824.376 ou le brevet FR-A-2.780.129. Variators, consisting of a belt transmission between a drive pulley and a driven pulley, applied in particular to self-propelled machines with variable forward speed, such as lawn mower, are well known to those skilled in this art as illustrate in particular FR-A-2,824,376 or FR-A-2,780,129.
Dans une telle application, la poulie motrice est montée sur l'arbre moteur porte-lame de coupe tandis que la poulie menée est montée sur l'arbre d'entrée d'un réducteur dont l'arbre de sortie est couplé directement ou via une transmission appropriée aux roues d'avancement de l'engin. Chacune des poulies est équipée de flasques mobiles pour accroître la plage de variation de vitesse. Le fonctionnement d'un tel variateur de l'état de la technique est le suivant. A vitesse minimale, les flasques de la poulie menante ou motrice sont écartés. Les flasques de la poulie menée sont rapprochés de manière telle que la courroie s'enroule sur un grand diamètre autour de l'arbre mené. Pour obtenir une augmentation de vitesse, on agit sur l'une ou l'autre des poulies dans un sens tendant à faire écarter les flasques de la poulie menée pour réduire le diamètre d'enroulement de la courroie et à faire se rapprocher les flasques de la poulie menante. On agit de manière inverse pour obtenir une réduction de la vitesse. Dans ce variateur de l'état de la technique, l'une des poulies peut être équipée d'un organe de réglage continu de la tension de la courroie commandé automatiquement en fonction du couple transmis entre lesdites poulies tandis que l'autre poulie est équipée d'un organe de commande manuelle de variation de vitesse qui, à l'état actif, génère un effort axial sur le flasque mobile d'une des poulies, uniquement sous l'action d'un opérateur. L'inconvénient d'une telle solution réside dans l'importance de l'effort de s commande à produire par l'opérateur pour obtenir la variation de vitesse. In such an application, the driving pulley is mounted on the cutting blade motor shaft while the driven pulley is mounted on the input shaft of a gearbox whose output shaft is coupled directly or via a appropriate transmission to the machine's advancing wheels. Each of the pulleys is equipped with movable flanges to increase the range of speed variation. The operation of such a variator of the state of the art is as follows. At minimum speed, the flanges of the driving or driving pulley are discarded. The flanges of the driven pulley are brought together so that the belt wraps around a large diameter around the driven shaft. To obtain a speed increase, one or other of the pulleys is acted in a direction tending to move the flanges of the driven pulley to reduce the winding diameter of the belt and to bring the flanges of the driving pulley. It acts in the opposite way to obtain a reduction of the speed. In this drive of the state of the art, one of the pulleys can be equipped with a continuous adjustment member of the tension of the automatically controlled belt as a function of the torque transmitted between said pulleys while the other pulley is equipped. a manual speed variation control member which, in the active state, generates an axial force on the movable flange of one of the pulleys, solely under the action of an operator. The disadvantage of such a solution lies in the importance of the control effort to be produced by the operator to obtain the speed variation.
Un but de la présente invention est donc de proposer un variateur de vitesse à courroie dont la conception permet de réduire l'effort de commande à produire par l'opérateur facilitant ainsi la conduite de l'engin. i0 An object of the present invention is therefore to provide a belt speed variator whose design reduces the control effort to be produced by the operator thus facilitating the driving of the machine. i0
A cet effet, l'invention a pour objet un variateur de vitesse à courroie, du type comportant au moins deux poulies à flasques à écartement variable, caractérisé en ce que chaque poulie a un flasque équipé d'un dispositif de chargement tendant à exercer de manière permanente un effort axial dans le sens d'un rapprochement des flasques de la poulie pour serrer la courroie entre lesdits flasques, l'une des poulies présentant un dispositif de chargement exerçant un effort axial moindre que l'autre dispositif, l'une des poulies comportant en outre un organe de commande manuelle de rapprochement ou d'écartement des flasques apte à exercer sur le flasque un faible effort de commande correspondant à la différence de puissance des dispositifs de chargement. To this end, the invention relates to a belt speed variator, of the type comprising at least two pulleys with flanges with variable spacing, characterized in that each pulley has a flange equipped with a loading device tending to exert permanently an axial force in the direction of an approximation of the flanges of the pulley for clamping the belt between said flanges, one of the pulleys having a loading device exerting a lower axial force than the other device, one of pulleys further comprising a manual control member for approximation or separation of the flanges able to exert on the flange a low control force corresponding to the power difference of the loading devices.
Grâce à une telle solution, l'effort à produire par l'opérateur correspond simplement à la différence de force des systèmes de chargement. Il en résulte 25 une facilité de commande. With such a solution, the effort to be produced by the operator is simply the difference in strength of the loading systems. This results in ease of control.
L'invention a encore pour objet un engin automoteur à vitesse d'avancement variable, tel que tondeuse à gazon, caractérisé en ce qu'il incorpore un variateur de vitesse du type précité. The invention also relates to a self-propelled machine variable speed, such as lawn mower, characterized in that it incorporates a speed variator of the aforementioned type.
L'invention sera bien comprise à la lecture de la description suivante d'exemples de réalisation, en référence aux dessins annexés dans lesquels: la figure 1 représente une vue en élévation d'un variateur de vitesse conforme à l'invention représenté à vitesse minimale; la figure 2 représente une vue en coupe du variateur de la figure 1; la figure 3 représente une vue en élévation d'un variateur de vitesse conforme à l'invention à vitesse moyenne; la figure 4 représente une vue en coupe de la figure 3; to la figure 5 représente un variateur de vitesse conforme à l'invention à vitesse maximale; la figure 6 représente une vue en coupe de la figure 5 et la figure 7 représente un autre mode de réalisation d'un variateur de vitesse conforme à l'invention. The invention will be better understood on reading the following description of exemplary embodiments, with reference to the appended drawings in which: FIG. 1 represents an elevational view of a speed variator according to the invention represented at minimum speed ; Figure 2 shows a sectional view of the variator of Figure 1; Figure 3 shows an elevational view of a speed variator according to the invention at medium speed; Figure 4 shows a sectional view of Figure 3; FIG. 5 represents a speed variator according to the invention at maximum speed; Figure 6 shows a sectional view of Figure 5 and Figure 7 shows another embodiment of a variable speed drive according to the invention.
Comme mentionné ci-dessus, le variateur de vitesse à courroie 9, objet de l'invention, comporte au moins deux poulies 1, 11 à flasques 4, 5 et 14, 15 à écartement variable. Un tel variateur de vitesse peut s'appliquer à des engins moteurs à vitesse d'avancement variable, tels que tondeuse à gazon. Dans ce cas, la poulie motrice ou menante, représentée en 1 aux figures, est entraînée par le moteur tandis que la poulie menée, représentée en 11 aux figures, est montée sur l'arbre d'entrée d'un réducteur dont l'arbre de sortie constitue un arbre d'entraînement des roues de l'engin. As mentioned above, the belt speed variator 9 object of the invention comprises at least two pulleys 1, 11 with flanges 4, 5 and 14, 15 with variable spacing. Such a variable speed drive can be applied to motor vehicles with variable forward speed, such as lawn mowers. In this case, the drive pulley or driving, shown in 1 in the figures, is driven by the motor while the driven pulley, shown at 11 in the figures, is mounted on the input shaft of a gearbox whose shaft output constitutes a drive shaft of the wheels of the machine.
De manière caractéristique à l'invention, chaque poulie 1, 11 a un flasque 4, 14 équipé d'un dispositif de chargement tendant à exercer de manière permanente un effort axial dans le sens d'un rapprochement des flasques 4, 5; 14, 15 de la poulie 1; 11 pour serrer la courroie 9 entre lesdits flasques 4, 5 ou 14, 15. Characteristically to the invention, each pulley 1, 11 has a flange 4, 14 equipped with a loading device tending to permanently exert an axial force in the direction of a bringing together of the flanges 4, 5; 14, 15 of the pulley 1; 11 to tighten the belt 9 between said flanges 4, 5 or 14, 15.
L'une des poulies, en l'occurrence la poulie représentée en 1 aux figures, présente un dispositif de chargement exerçant un effort axial moindre que l'autre dispositif. Cette poulie comporte en outre un organe 19 de commande manuelle de rapprochement ou d'écartement des flasques apte à exercer sur le flasque 4 mobile, équipé du dispositif de chargement de moindre effort, un faible effort de commande correspondant à la différence de puissance des dispositifs de chargement. II pourrait également être envisagé de positionner l'organe de commande sur la poulie équipé du dispositif de chargement de plus s grande puissance, cet organe de commande fournissant un effort inverse au dispositif de chargement, cet effort correspondant à la différence de puissance entre les deux dispositifs de chargement. Ce mode de réalisation n'est pas représenté. One of the pulleys, in this case the pulley shown at 1 in the figures, has a loading device exerting a lower axial force than the other device. This pulley further comprises a member 19 for manually controlling the approach or spacing of the flanges able to exert on the movable flange 4, equipped with the loading device of least effort, a low control effort corresponding to the difference in power of the devices. loading. It could also be envisaged to position the control member on the pulley equipped with the loading device of greater power, this control member providing a reverse force to the loading device, this effort corresponding to the power difference between the two. loading devices. This embodiment is not shown.
lo Dans un premier mode de réalisation conforme aux figures 1 à 6, chaque poulie 1, 11 est constituée d'un flasque 5; 15 généralement fixe sur un arbre 2, 12 et d'un flasque 4, 14 mobile axialement et angulairement autour dudit arbre 2, 12 au moins par l'intermédiaire du dispositif de chargement. Ce dispositif de chargement est constitué de rampes 7, 8 ou 17, 18 profilées s'interpénétrant ménagées l'une 7, 17 sur le flasque 4, 14 mobile, l'autre 8, 18 sur une pièce 3, 13 en regard, solidaire en rotation de l'arbre 2, 12. Ces rampes 7, 8 et 17, 18 s'écartent l'une de l'autre sous l'effet combiné d'un ressort 6, 16 interposé entre flasque 4, 14 mobile et pièce 3, 13 en regard et du couple transmis. Cet écartement des rampes 7, 8; 17, 18 tend à provoquer un rapprochement desdits flasques 4, 5; 14, 15 et par suite, une variation de vitesse. In a first embodiment according to FIGS. 1 to 6, each pulley 1, 11 consists of a flange 5; 15 generally fixed on a shaft 2, 12 and a flange 4, 14 movable axially and angularly around said shaft 2, 12 at least through the loading device. This loading device consists of ramps 7, 8 or 17, 18 profiled interpenetrating formed one 7, 17 on the flange 4, 14 mobile, the other 8, 18 on a part 3, 13 facing, secured in rotation of the shaft 2, 12. These ramps 7, 8 and 17, 18 deviate from one another under the combined effect of a spring 6, 16 interposed between the flange 4, 14 mobile and room 3, 13 opposite and the couple transmitted. This spacing of the ramps 7, 8; 17, 18 tends to cause a reconciliation of said flanges 4, 5; 14, 15 and consequently a variation of speed.
Ainsi, un tel dispositif de chargement peut être considéré comme affectant la forme d'une came constituée de deux plateaux coaxiaux à rampes inclinées à contact glissant, l'un des plateaux étant solidaire en rotation du flasque 4, 14 mobile de la poulie, l'autre plateau ou pièce 3, 13 en regard étant solidaire en rotation de l'arbre porteur de la poulie. Le ressort 6, 16 de torsion interposé entre les plateaux porte-rampes rappelle les plateaux porte-rampes en position écartée. Généralement, le plateaux porte-rampes, solidaire en rotation du flasque mobile, est réalisé d'une seule pièce avec ledit flasque. Le ressort 6, 16 du dispositif de chargement, interposé entre flasque 4, 14 mobile et pièce 3, 13 en regard est un ressort généralement hélicoïdal s'enroulant autour de l'arbre 2, 12 de la poulie 1, 11, ce ressort 6, 16 étant fixé à l'une de ses extrémités au flasque 4, 14 mobile et à son autre extrémité à la pièce 3, 13 en regard de manière à travailler à la fois en compression et en torsion. Au moins l'une des poulies, en l'occurrence, dans les exemples représentés, la poulie menante, est équipée d'un organe 19 de commande manuelle de la variation de vitesse agissant sur ladite poulie. Thus, such a loading device can be considered as affecting the shape of a cam consisting of two coaxial plates inclined ramps with sliding contact, one of the plates being integral in rotation with the flange 4, 14 movable pulley, l other plate or part 3, 13 facing rotationally integral with the bearing shaft of the pulley. The spring 6, 16 of torsion interposed between the trays ramps recalls the trays ramps in the spread position. Generally, the ramp-carrier plates, integral in rotation with the movable flange, is made in one piece with said flange. The spring 6, 16 of the loading device, interposed between the flange 4, 14 and movable piece 3, 13 facing is a generally helical spring winding around the shaft 2, 12 of the pulley 1, 11, this spring 6 , 16 being fixed at one of its ends to the flange 4, 14 mobile and at its other end to the part 3, 13 facing so as to work both in compression and torsion. At least one of the pulleys, in this case, in the examples shown, the driving pulley, is equipped with a member 19 for manual control of the speed variation acting on said pulley.
s Dans un autre mode de réalisation non représenté dans lequel les poulies constituent l'une une poulie menante, l'autre une poulie menée, l'organe 19 de commande manuelle de variation de vitesse peut agir de manière équivalente sur la poulie menée. In another embodiment not shown in which the pulleys are one driving pulley, the other a driven pulley, the body 19 manual control speed variation can act equally on the driven pulley.
io Cet organe de commande peut affecter un grand nombre de formes. Dans l'exemple représenté à la figure 2, l'organe de commande est constitué par une fourchette 19 déplaçable angulairement par l'opérateur, cette fourchette agissant sur le flasque 4 mobile dans le sens d'un rapprochement ou d'écartement du flasque 4 mobile du flasque 5 fixe en fonction de la vitesse souhaitée. Comme le flasque 4 est entraîné en rotation par l'intermédiaire de la pièce 3 solidaire en rotation de l'arbre 2, un organe de roulement 20 est interposé entre flasque 4 et fourchette 19 pour permettre à la fourchette 19 d'exercer, par l'intermédiaire de l'organe 20 de roulement, un effort axial sur ledit flasque 4. This controller can affect a large number of shapes. In the example shown in FIG. 2, the control member is constituted by a fork 19 that can be moved angularly by the operator, this fork acting on the movable flange 4 in the direction of bringing the flange 4 closer to or away from the flange 4 mobile flange 5 fixed according to the desired speed. As the flange 4 is rotated through the part 3 integral in rotation with the shaft 2, a rolling member 20 is interposed between the flange 4 and fork 19 to allow the fork 19 to exert, by means of intermediate of the rolling member 20, an axial force on said flange 4.
Bien évidemment, d'autres modes de réalisation de l'organe de commande peuvent encore être envisagés. Of course, other embodiments of the control member can still be envisaged.
Grâce à une telle conception du variateur, si l'on imagine que les dispositifs de chargement exercent l'un sur la poulie motrice équipée de l'organe de commande manuelle un effort axial permanent de l'ordre de 450 N, l'autre sur la poulie menée un effort axial permanent de l'ordre de 500 N à vitesse minimale, l'opérateur doit, en agissant sur l'organe de commande, uniquement produire un effort de commande voisin de 50 N. Il en résulte ainsi une facilité de la commande de variation de vitesse, la vitesse pouvant varier à l'intérieur d'une plage comprise entre 1 et 9 km/h. With such a design of the variator, if one imagines that the loading devices exert one on the drive pulley equipped with the manual control member a permanent axial force of the order of 450 N, the other on the pulley carries a permanent axial force of the order of 500 N at minimum speed, the operator must, acting on the control member, only produce a control force of 50 N neighbor. the speed variation control, the speed being able to vary within a range of between 1 and 9 km / h.
Le fonctionnement d'un tel variateur est analogue à celui décrit pour l'état de la technique, à savoir un rapprochement des flasques de la poulie menante générera un accroissement de la vitesse tandis qu'un écartement desdits flasques de la poulie menante s'accompagnant bien évidemment d'un rapprochement des flasques de la poulie menée provoquera une réduction de vitesse. Il doit être noté que les dispositifs de chargement, tels que décrits ci- dessus, exercent un effort axial permanent, variable en fonction du couple transmis entre lesdites poulies. Le sens de rotation des poulies est représenté par la flèche 10 aux figures. The operation of such a variator is similar to that described for the state of the art, namely an approximation of the flanges of the driving pulley will generate an increase in speed while a spacing of said flanges of the driving pulley accompanying obviously a closer flanges of the driven pulley will cause a reduction in speed. It should be noted that the loading devices, as described above, exert a permanent axial force, variable as a function of the torque transmitted between said pulleys. The direction of rotation of the pulleys is represented by the arrow 10 in the figures.
On note également que, dans les exemples représentés, les dispositifs de io chargement sont montés en opposition de part et d'autre de la courroie 9 pour éviter l'inclinaison de la courroie 9 sur son axe. Ainsi, dans les exemples représentés, la poulie menante est équipée d'un dispositif de chargement s'étendant d'un côté du plan de la courroie tandis que la poulie menée est équipée d'un dispositif de chargement s'étendant de l'autre côté du plan de la courroie. It is also noted that, in the examples shown, the loading devices are mounted in opposition on either side of the belt 9 to prevent the inclination of the belt 9 on its axis. Thus, in the examples shown, the driving pulley is equipped with a loading device extending on one side of the plane of the belt while the driven pulley is equipped with a loading device extending from the other. side of the plane of the belt.
Dans un autre mode de réalisation conforme à celui représenté à la figure 7, le dispositif de chargement est constitué à chaque fois d'un ressort de puissance différente d'un dispositif à un autre. Les avantages d'un tel variateur sont similaires à ceux obtenus dans le cas des figures 1 à 6. Le dispositif de chargement n'est plus dans ce cas un dispositif sensible au couple mais exerce au contraire un effort axial constant. In another embodiment in accordance with that shown in FIG. 7, the charging device is constituted in each case by a power spring that is different from one device to another. The advantages of such a drive are similar to those obtained in the case of Figures 1 to 6. The loading device is not in this case a torque sensitive device but instead exerts a constant axial force.
Claims (8)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0508094A FR2889865A1 (en) | 2005-07-29 | 2005-07-29 | Variable-speed drive unit for e.g. riding mower, has manual control element drawing together or separating flanges that are able to exert slight control effort corresponding to difference in power of loading devices on flanges |
| FR0600440A FR2889866B1 (en) | 2005-07-29 | 2006-01-18 | BELT SPEED VARIATOR AND VARIABLE SPEED AUTOMOTIVE MACHINE EQUIPPED WITH SUCH A VARIATOR |
| US11/495,461 US8393985B2 (en) | 2005-07-29 | 2006-07-31 | Variable-speed belt drive and variable-speed drive device equipped with such a variable-speed drive unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0508094A FR2889865A1 (en) | 2005-07-29 | 2005-07-29 | Variable-speed drive unit for e.g. riding mower, has manual control element drawing together or separating flanges that are able to exert slight control effort corresponding to difference in power of loading devices on flanges |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2889865A1 true FR2889865A1 (en) | 2007-02-23 |
Family
ID=36143432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0508094A Pending FR2889865A1 (en) | 2005-07-29 | 2005-07-29 | Variable-speed drive unit for e.g. riding mower, has manual control element drawing together or separating flanges that are able to exert slight control effort corresponding to difference in power of loading devices on flanges |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2889865A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1536960A (en) * | Improvements to extendable pulley speed variators | |||
| US2792712A (en) * | 1952-07-18 | 1957-05-21 | Gerbing Mfg Corp | Control for a variable pitch pulley |
| FR2774953A1 (en) * | 1998-02-18 | 1999-08-20 | France Reducteurs Sa | Speed transmission for lawn mower |
| FR2780129A1 (en) | 1998-06-19 | 1999-12-24 | France Reducteurs Sa | Variable speed belt transmission for traction engine |
| FR2824376A1 (en) | 2001-05-04 | 2002-11-08 | Commerciale Et D Engineering S | Speed transmission for lawn mower comprises belt transmission between driving and driven pulleys each having movable cheek webs whose displacements respectively ensure permanent belt tension and speed variation |
| EP1396664A2 (en) * | 2002-09-04 | 2004-03-10 | JATCO Ltd | Belt-type continuously variable transmission |
-
2005
- 2005-07-29 FR FR0508094A patent/FR2889865A1/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1536960A (en) * | Improvements to extendable pulley speed variators | |||
| US2792712A (en) * | 1952-07-18 | 1957-05-21 | Gerbing Mfg Corp | Control for a variable pitch pulley |
| FR2774953A1 (en) * | 1998-02-18 | 1999-08-20 | France Reducteurs Sa | Speed transmission for lawn mower |
| FR2780129A1 (en) | 1998-06-19 | 1999-12-24 | France Reducteurs Sa | Variable speed belt transmission for traction engine |
| FR2824376A1 (en) | 2001-05-04 | 2002-11-08 | Commerciale Et D Engineering S | Speed transmission for lawn mower comprises belt transmission between driving and driven pulleys each having movable cheek webs whose displacements respectively ensure permanent belt tension and speed variation |
| EP1396664A2 (en) * | 2002-09-04 | 2004-03-10 | JATCO Ltd | Belt-type continuously variable transmission |
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