FR2743024A1 - Progressive rear suspension for bicycle - Google Patents
Progressive rear suspension for bicycle Download PDFInfo
- Publication number
- FR2743024A1 FR2743024A1 FR9515814A FR9515814A FR2743024A1 FR 2743024 A1 FR2743024 A1 FR 2743024A1 FR 9515814 A FR9515814 A FR 9515814A FR 9515814 A FR9515814 A FR 9515814A FR 2743024 A1 FR2743024 A1 FR 2743024A1
- Authority
- FR
- France
- Prior art keywords
- pivot
- axis
- link
- fixed
- axes
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G7/00—Pivoted suspension arms; Accessories thereof
- B60G7/02—Attaching arms to sprung part of vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K25/00—Axle suspensions
- B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
- B62K25/28—Axle suspensions for mounting axles resiliently on cycle frame or fork with pivoted chain-stay
- B62K25/286—Axle suspensions for mounting axles resiliently on cycle frame or fork with pivoted chain-stay the shock absorber being connected to the chain-stay via a linkage mechanism
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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
- F16H21/00—Gearings comprising primarily only links or levers, with or without slides
- F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
- F16H21/44—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for conveying or interconverting oscillating or reciprocating motions
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
La présente invention concerne un dispositif permettant de modifier la longueur du levier exercé par yune partie oscillante sur l'ensemble amortisseursuspension. The present invention relates to a device making it possible to modify the length of the lever exerted by an oscillating part on the shock absorber assembly.
Le rapport entre la force exercée par uen partie oscillante (bras oscillant ou triangle de suspension) sur sa suspension (amortisseur + ressort) étant traditionnellement constant, le véhicule peut s'enfoncer trop fortement si l'effort exercé sur celui-ci ou sur ses roues est trop important. The ratio between the force exerted by an oscillating part (swing arm or suspension triangle) on its suspension (shock absorber + spring) being traditionally constant, the vehicle can sink too strongly if the force exerted on it or on its wheels is too important.
Le dispositif, selon l'invention, remédie à ce problème. I1 se caractérise des autres types de suspension par l'ajout d'un pivot fixé sur la partie oscillante actionné par une biellette fixée sur le chassis ou inversement, selon la disponibilité des éléments alentour. Une autre biellette se fixe sur le pivot et sur des bielles de guidage tel que ses axes de rotation soient diamétralement opposés à l'axe du pivot et que sa forme contourne l'axe du pivot. The device according to the invention overcomes this problem. I1 is characterized by other types of suspension by the addition of a pivot fixed on the oscillating part actuated by a link fixed on the chassis or vice versa, according to the availability of the surrounding elements. Another link is fixed on the pivot and on guide rods such that its axes of rotation are diametrically opposite the axis of the pivot and that its shape circumvents the axis of the pivot.
Le levier constant exercé par la partie oscillante sur l'ensemble amortisseurressort est transmis par le système auquel il ajoute un second levier uniformément varié. La réponse de l'ensemble amortisseur-ressort se trouve amplifiée par l'augmentation de la course en fonction de l'enfoncement de l'ensemble. The constant lever exerted by the oscillating part on the damping-spring assembly is transmitted by the system to which it adds a second uniformly varied lever. The response of the shock absorber-spring assembly is amplified by the increase in the stroke as a function of the depression of the assembly.
Selon des modes particuliers de réalisation: - il est possible d'inverser le sens du système en fixant le support 2 sur le chassis et l'axe 10 avec la fixation de l'ensemble amortisseur-ressort sur le bras oscillant. According to particular embodiments: - it is possible to reverse the direction of the system by fixing the support 2 on the chassis and the axis 10 with the fixing of the damper-spring assembly on the swinging arm.
- la bielle de renvoi 4 peut-être remplacée par une jambe de force faisant partie intégrante de l'amortisseur. Les trois axes alignés sont alors les deux axes de fixation de l'amortisseur diamétralement opposés à l'axe 8 grâce à la jambe de force incurvée.- The return rod 4 can be replaced by a strut forming an integral part of the shock absorber. The three aligned axes are then the two fixing axes of the damper diametrically opposite to the axis 8 thanks to the curved strut.
- I'axe 7 peut disparaître et être remplacé par un cylindre entouré d'un revêtement bronze et dont laxe 8 (axe du pivot), sera décentré par rapport au cylindre. Ce cylindre actionnera une jambe de force faisant partie intégrante de l'amortisseur.The axis 7 can disappear and be replaced by a cylinder surrounded by a bronze coating and whose axis 8 (axis of the pivot) will be off-center with respect to the cylinder. This cylinder will activate a strut which is an integral part of the shock absorber.
- il est possible de positionner la biellette 5 côté axe du bras oscillant et positionner alors l'amortisseur vers l'extérieur du système. - It is possible to position the link 5 on the axis side of the swinging arm and then position the damper towards the outside of the system.
Les dessins annexés illustrent l'invention:
- La figure 1 représente la vue dessus du dispositif.The accompanying drawings illustrate the invention:
- Figure 1 shows the top view of the device.
- La figure 2 représente en coupe le dispositif monté sur bras oscillant et cadre. - Figure 2 shows in section the device mounted on the swinging arm and frame.
- La figure 3 représente le dispositif selon l'invention. - Figure 3 shows the device according to the invention.
- La figure 4 représente le dispositif selon l'invention dans une autre position de fonctionnement. - Figure 4 shows the device according to the invention in another operating position.
- Les figures 5 et 6 représentent des vanantes du dispositif. - Figures 5 and 6 show vanantes of the device.
- La figure 7 représente un diagramme mettant en évidence l'avantage du système. - Figure 7 shows a diagram highlighting the advantage of the system.
En référence races dessins, le dispositif comporte une fixation 2 reliant le système au bras oscillant 1 et supportant le pivot 3 par l'axe 8. Une biellette 5 se fixe entre pivot 3 et cadre 6 par les axes 9 et 10 Une biellette 4 se fixe sur le pivot par l'axe 7 et pousse les bielles de guidage articulées sur bras oscillant par l'axe 13. In reference to the drawings, the device comprises a fixing 2 connecting the system to the swinging arm 1 and supporting the pivot 3 by the axis 8. A link 5 is fixed between pivot 3 and frame 6 by the axes 9 and 10 A link 4 is fixed on the pivot by the axis 7 and pushes the articulated guide rods on the oscillating arm by the axis 13.
Chaque axe tourne sur des inserts en bronze.Each axis rotates on bronze inserts.
Lorsque le bras oscillant est actionné, il exerce alors un premier levier sur l'amortisseur transmis par le dispositif. When the swinging arm is actuated, it then exerts a first lever on the damper transmitted by the device.
La biellette 5 oblige le pivot 3 à effectuer une rotation et pousse ainsi la biellette 4. La biellette 4 renvoie alors l'effort sur les bielles de guidage et ainsi sur l'ensemble amortisseur-ressort 12. The link 5 forces the pivot 3 to rotate and thus pushes the link 4. The link 4 then returns the force to the guide rods and thus to the damper-spring assembly 12.
A noter sur la figure 3 la direction et le sens des vecteurs translation T et rotation R au départ du mouvement; leurs directions sont perpendiculaires. Sur la figure 4 où le dispositif est actionné, leur direction et leur sens tendent à se rejoindre; il y a donc création d'un angle mort au départ du mouvement (figure 3), où la translation de la biellette 4 est faible, voir inexistante, qui passe à un angle maxi (figure 4) où la translation est importante. On a donc une translation uniformément variée additionnée à un levier constant, d'où un rapport débattement-course variable (figure 7) où la force du ressort et la réaction de l'amortisseur augmentent en fonction de l'enfoncement de la roue en décrivant une parabole, alors que les systèmes classiques décrivent une droite. Note in Figure 3 the direction and direction of the translation T and rotation R vectors at the start of the movement; their directions are perpendicular. In Figure 4 where the device is actuated, their direction and their direction tend to meet; there is therefore creation of a blind spot at the start of the movement (FIG. 3), where the translation of the link 4 is low, or even non-existent, which passes to a maximum angle (FIG. 4) where the translation is significant. There is therefore a uniformly varied translation added to a constant lever, hence a variable travel-stroke ratio (Figure 7) where the force of the spring and the reaction of the shock absorber increase depending on the depression of the wheel by describing a parable, whereas the classic systems describe a straight line.
Selon une variante illustrée sur la figure 5, il est possible de remplacer la biellette 4 par une jambe de force 15 prenant appui sur l'axe 7 et faisant partie intégrante de l'amortisseur. Les axes de fixation de l'amortisseur sont diamétralement opposés à l'axe 8. On supprime alors les bielles de guidage 14. La fabrication du système est alors simplifiée. According to a variant illustrated in FIG. 5, it is possible to replace the link 4 with a strut 15 bearing on the axis 7 and forming an integral part of the shock absorber. The shock absorber fixing axes are diametrically opposite the axis 8. The guide rods 14 are then removed. The manufacture of the system is then simplified.
Selon une autre variante illustrée sur la figure 6, on supprime l'axe 7 sur le pivot 3 et on le remplace par un cylindre 18 fixé par l'axe 8 décentré. According to another variant illustrated in FIG. 6, the axis 7 on the pivot 3 is removed and it is replaced by a cylinder 18 fixed by the offset axis 8.
La rotation de ce cylindre engendre un déplacement de la jambe de force 16 faisant partie intégrante de l'amortisseur. Le cylindre sera entraîné par la vis 17 à tête creuse qui, par serrage, bloque le cylindre contre le pivot. Elle permet entre autre de caler le cylindre par rapport au reste du dispositif afin d'optimiser le fonctionnement. The rotation of this cylinder generates a displacement of the strut 16 forming an integral part of the shock absorber. The cylinder will be driven by the socket head screw 17 which, by tightening, blocks the cylinder against the pivot. Among other things, it allows the cylinder to be wedged relative to the rest of the device in order to optimize operation.
A noter qu'il est préférable pour les variantes des figures 5 et 6 de monter la biellette 5 côté axe du bras oscillant et l'amortisseur sur l'extérieur. Ce positionnement du dispositif sur le reste du système de suspension augmente la variabilité du dispositif, non seulement par l'objet même de l'invention, mais aussi en éloignant l'appui de l'ensemble amortisseur-ressort sur le dispositif de l'axe du bras oscillant. Note that it is preferable for the variants of Figures 5 and 6 to mount the link 5 on the axis side of the swing arm and the damper on the outside. This positioning of the device on the rest of the suspension system increases the variability of the device, not only by the very object of the invention, but also by moving the support of the damper-spring assembly on the device away from the axis swing arm.
Ce dispositif évite qu'un effort important s'appliquant sur le véhicule (charge élevée) n'entraîne un abaissement élevé du véhicule. This device avoids that a significant force applied to the vehicle (high load) does not lead to a high lowering of the vehicle.
Il facilite l'absorption des chocs sur la roue sur un plus court débattement, ce qui apporte un comportement plus sportif à un véhicule qui doit rester confortable; il réduit, entre autre, l'effet de pompe ressenti sur des bicyclettes dotées d'une suspension arrière. It facilitates the absorption of shocks on the wheel on a shorter travel, which brings a more sporty behavior to a vehicle which must remain comfortable; it reduces, among other things, the pump effect felt on bicycles with rear suspension.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9515814A FR2743024B1 (en) | 1995-12-29 | 1995-12-29 | VARIABLE LEVER SUSPENSION SYSTEM |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9515814A FR2743024B1 (en) | 1995-12-29 | 1995-12-29 | VARIABLE LEVER SUSPENSION SYSTEM |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2743024A1 true FR2743024A1 (en) | 1997-07-04 |
FR2743024B1 FR2743024B1 (en) | 1998-03-27 |
Family
ID=9486215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR9515814A Expired - Fee Related FR2743024B1 (en) | 1995-12-29 | 1995-12-29 | VARIABLE LEVER SUSPENSION SYSTEM |
Country Status (1)
Country | Link |
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FR (1) | FR2743024B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2590560A1 (en) * | 1985-11-26 | 1987-05-29 | Guilbaud Jean Pierre | Device for mechanically controlling, by means of a cable, the spatial displacement of an object |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2092532A (en) * | 1979-02-13 | 1982-08-18 | Honda Motor Co Ltd | Motorcycle wheel suspension |
FR2514316A1 (en) * | 1981-10-14 | 1983-04-15 | Honda Motor Co Ltd | MOTORCYCLE REAR SUSPENSION SYSTEM EQUIPPED WITH PROGRESSIVE JOINT MECHANISM |
EP0104426A2 (en) * | 1982-08-27 | 1984-04-04 | Diafil International S.A. | Elastic suspension system provided with a shock absorber for the rear wheel of a motorcycle |
FR2539095A1 (en) * | 1983-01-10 | 1984-07-13 | Manca Francesco | Variable-angle progressive damping device, especially for motor cycles, frame intended for this purpose and motor cycles thus equipped |
US4506755A (en) * | 1981-12-11 | 1985-03-26 | Honda Motor Co Ltd | Rear suspension system for motorcycles |
US4515236A (en) * | 1981-12-29 | 1985-05-07 | Yamaha Hatsudoki Kabushiki Kaisha | Rear suspension for motorcycles |
-
1995
- 1995-12-29 FR FR9515814A patent/FR2743024B1/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2092532A (en) * | 1979-02-13 | 1982-08-18 | Honda Motor Co Ltd | Motorcycle wheel suspension |
FR2514316A1 (en) * | 1981-10-14 | 1983-04-15 | Honda Motor Co Ltd | MOTORCYCLE REAR SUSPENSION SYSTEM EQUIPPED WITH PROGRESSIVE JOINT MECHANISM |
US4506755A (en) * | 1981-12-11 | 1985-03-26 | Honda Motor Co Ltd | Rear suspension system for motorcycles |
US4515236A (en) * | 1981-12-29 | 1985-05-07 | Yamaha Hatsudoki Kabushiki Kaisha | Rear suspension for motorcycles |
EP0104426A2 (en) * | 1982-08-27 | 1984-04-04 | Diafil International S.A. | Elastic suspension system provided with a shock absorber for the rear wheel of a motorcycle |
FR2539095A1 (en) * | 1983-01-10 | 1984-07-13 | Manca Francesco | Variable-angle progressive damping device, especially for motor cycles, frame intended for this purpose and motor cycles thus equipped |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2590560A1 (en) * | 1985-11-26 | 1987-05-29 | Guilbaud Jean Pierre | Device for mechanically controlling, by means of a cable, the spatial displacement of an object |
Also Published As
Publication number | Publication date |
---|---|
FR2743024B1 (en) | 1998-03-27 |
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Legal Events
Date | Code | Title | Description |
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ST | Notification of lapse |