FR2868390A1 - Anti-dive device for motorcycle front fork, has damper with separated reservoir comprising electro-valve permitting to instantaneously limit stroke of piston of main cylinder while braking by blocking return of oil in reservoir - Google Patents

Anti-dive device for motorcycle front fork, has damper with separated reservoir comprising electro-valve permitting to instantaneously limit stroke of piston of main cylinder while braking by blocking return of oil in reservoir Download PDF

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Publication number
FR2868390A1
FR2868390A1 FR0403467A FR0403467A FR2868390A1 FR 2868390 A1 FR2868390 A1 FR 2868390A1 FR 0403467 A FR0403467 A FR 0403467A FR 0403467 A FR0403467 A FR 0403467A FR 2868390 A1 FR2868390 A1 FR 2868390A1
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France
Prior art keywords
front fork
reservoir
piston
oil
motorcycle front
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Pending
Application number
FR0403467A
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French (fr)
Inventor
Alexis Defarge
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to FR0403467A priority Critical patent/FR2868390A1/en
Publication of FR2868390A1 publication Critical patent/FR2868390A1/en
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Classifications

    • 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
    • B62K25/06—Axle suspensions for mounting axles resiliently on cycle frame or fork with telescopic fork, e.g. including auxiliary rocking arms
    • B62K25/08—Axle suspensions for mounting axles resiliently on cycle frame or fork with telescopic fork, e.g. including auxiliary rocking arms for front wheel
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
    • F16F9/064—Units characterised by the location or shape of the expansion chamber
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The device has a damper with a separated reservoir (3) comprising an electro-valve (1) permitting to instantaneously limit stroke of a piston (4) of a main cylinder (11) by blocking return of oil in the reservoir while braking. The electro-valve is controlled by sensors situated on master cylinders of a brake pedal and a brake lever. The oil is circulated between the reservoir and volume under the piston by a conduit (8).

Description

La présente invention concerne un dispositif antiplongée pour fourcheThe present invention relates to an anti-dive device for fork

avant de moto constitué d'un amortisseur particulier comportant un électro-clapet destiné à bloquer le retour de l'huile dans le réservoir séparé !ors des freinages.  motorcycle front consisting of a special damper comprising an electro-valve for blocking the return of the oil in the separate tank! Ors braking.

Pour éviter les désagréments provoqués par le fait que les motos plongent sur l'avant dès que l'on freine, les constructeurs ont investi des moyens importants afin de trouver une solution satisfaisante. Plusieurs systèmes furent proposés et même installés en série avec plus ou moins d'efficacité. En fait le phénomène de l'écrasement sur l'avant de la moto lors des freinages est simplement dû à l'inertie donc inévitable. Toutefois on peut essayer dans réduire les effets dans le but d'améliorer le confort de conduite et de limiter cet aspect désagréable voire même dangereux.  To avoid the inconvenience caused by the fact that the motorcycles plunge on the front as soon as one brakes, the manufacturers invested important means in order to find a satisfactory solution. Several systems were proposed and even installed in series with more or less efficiency. In fact the phenomenon of crushing on the front of the bike during braking is simply due to inertia so inevitable. However we can try to reduce the effects in order to improve driving comfort and limit this unpleasant or even dangerous.

1 0 Le dispositif selon l'invention permet de remédier à cet inconvénient en agissant directement sur la suspension de la fourche avant en limitant sa course lors des freinages. Pour ce faire, il est nécessaire d'utiliser des amortisseurs particuliers, conçus sur la base du concept des amortisseurs à réservoir séparé auxquels on apporte un complément de technologie.  The device according to the invention overcomes this disadvantage by acting directly on the suspension of the front fork limiting its stroke during braking. To do this, it is necessary to use special dampers, designed on the basis of the concept of separate tank dampers which is provided with additional technology.

Ces amortisseurs sont généralement constitués d'un ressort(6) entourant un cylindre(11) dans lequel coulisse un piston noyé(4) dans de l'huile(9). Les efforts exercés sur la fourche sont reportés sur la tige solidaire du piston. Le déplacement de celui-ci dans l'huile absorbe une partie de l'énergie et limite le débattement de la fourche tout en évitant les réactions d'oscillation qu'engendrerait un simple ressort. Le déplacement rapide du piston comprime l'huile ce qui s'oppose à son déplacement. Ce piston(4) n'est pas une barrière hermétique qui bloquerait complètement ses déplacements. En effet il laisse passer un débit contrôlé d'huile tant dans un sens que dans l'autre. C'est pourquoi un effort prolongé sur la fourche provoque un transfert d'huile sous le piston lequel remonte de façon importante dans le cylindre. Dès que l'effort se relâche, le ressort alors comprimé permet à l'amortisseur de retrouver ses dimensions c'est à dire au piston de reprendre sa position basse. L'huile est maintenue sous pression par un gaz sous pression(5) qui contribue à la souplesse et à la vitesse de réactivité de l'amortisseur. Souvent un piston flottant(2) sépare l'huile du gaz.. Pour les amortisseurs dits à réservoir séparé le gaz sous pression, le piston flottant et une partie de l'huile se trouve dans un réservoir contigu(3) servant de vase d'expansion. C'est ce type d'amortisseur que se propose d'aménager l'invention en plaçant un électro-clapet ou simplement une électrovanne doublée en parallèle d'un clapet anti-retour destiné à bloquer le retour de l'huile dans le réservoir limitant ainsi la course du piston et donc en empêchant l'enfoncement de la fourche avant. Ce seul aménagement ne suffit pas. En effet le piston(4) doit dès lors, être un piston complet, sans fuite. C'est pourquoi un conduit extérieur(8) permet la libre circulation de l'huile contenue sous le piston avec le réservoir(3) et donc la partie supérieur du cylindre. Il relie donc la base du cylindre au canal de liaison(10) reliant le cylindre(11) à son réservoir(3) et ce en amont de l'électro-clapet(l) côté réservoir. Le clapet de ce dispositif permet à tout moment le passage de l'huile du réservoir vers le cylindre ce qui permet au piston de reprendre sa position basse à chaque relâchement de l'effort de compression et donc de maintenir une suspension active de la roue avant. Pendant cette phase de blocage du retour de l'huile dans le réservoir séparé, la suspension bien que durcie, doit garder une relative souplesse. C'est pourquoi dans le haut du cylindre principal une deuxième bulle de gaz sous pression(5) se trouve sollicitée. Elle est isolée de!'huile(9) par un piston flottant(2) dont la course est d'ailleurs limitée par un étranglement(12) juste au-dessus du canal de liaison(10).  These dampers generally consist of a spring (6) surrounding a cylinder (11) in which slides an embedded piston (4) in oil (9). The forces exerted on the fork are reported on the rod secured to the piston. The displacement of this one in the oil absorbs a part of the energy and limits the deflection of the fork while avoiding the reactions of oscillation that would generate a simple spring. The rapid displacement of the piston compresses the oil which is opposed to its displacement. This piston (4) is not a hermetic barrier that would completely block his movements. In fact, it allows a controlled flow of oil to flow in one direction and the other. This is why a prolonged effort on the fork causes an oil transfer under the piston which goes up significantly in the cylinder. As soon as the force is released, the spring then compressed allows the damper to regain its dimensions, that is to say the piston to resume its low position. The oil is maintained under pressure by a pressurized gas (5) which contributes to the flexibility and speed of reactivity of the damper. Often a floating piston (2) separates the oil from the gas. For the so-called separate tank dampers the pressurized gas, the floating piston and a part of the oil is in an adjoining tank (3) serving as a storage vessel. 'expansion. It is this type of damper that proposes to develop the invention by placing an electro-valve or simply a solenoid valve doubled in parallel with a non-return valve for blocking the return of the oil in the limiting tank thus the stroke of the piston and thus preventing the depression of the front fork. This development alone is not enough. Indeed the piston (4) must therefore be a complete piston, without leakage. This is why an outer conduit (8) allows the free flow of the oil contained under the piston with the reservoir (3) and therefore the upper part of the cylinder. It connects the base of the cylinder to the connecting channel (10) connecting the cylinder (11) to its reservoir (3) and upstream of the electro-valve (l) tank side. The valve of this device allows at any time the passage of the oil from the reservoir to the cylinder which allows the piston to resume its lower position with each release of the compression force and thus to maintain an active suspension of the front wheel . During this phase of blocking the return of the oil in the separate tank, the suspension although hardened, must keep a relative flexibility. This is why in the top of the main cylinder a second pressurized gas bubble (5) is solicited. It is isolated from the oil (9) by a floating piston (2) whose stroke is further limited by a constriction (12) just above the connecting channel (10).

Le fonctionnement est très simple: à chaque action sur!es freins avant ou arrière, un capteur situé sur le maître-cylindre de la pédale de frein et sur celui du levier de frein au guidon commande l'électrovanne ou l'électro-clapet(l) qui instantanément bloque le retour d'huile donc durcit la suspension avant en limitant la course de retrait de l'amortisseur.  The operation is very simple: with each action on the front or rear brakes, a sensor located on the master cylinder of the brake pedal and on that of the handlebar brake lever controls the solenoid valve or the electro-valve ( l) which instantly blocks the return of oil so hardens the front suspension by limiting the withdrawal stroke of the damper.

Les dessins illustrent l'invention.The drawings illustrate the invention.

La figure 1 montre une coupe schématique d'un amortisseur à réservoir séparé adapté selon l'invention. La figure 2 montre ce que pourrait être un électro-clapet qui sur commande, bloque la circulation d'huile, 10 mais que dans un sens.  Figure 1 shows a schematic section of a separate reservoir damper adapted according to the invention. Figure 2 shows what could be an electro-valve that on command, blocks the flow of oil, but only in one direction.

En référence à ces dessins le dispositif est constitué d'un amortisseur à réservoir séparé comportant un certain nombre d'aménagements originaux et indispensables lui permettant de limiter instantanément la course du piston(4) du cylindre principa!(11) lors des freinages sur ordre des capteurs situés sur le maître-cylindre du levier de frein du guidon et sur celui de la pédale de frein. Ces aménagements concernent: 1 5 - Un électro-clapet(1) ou simplement d'un clapet classique doublée en parallèle d'une électrovanne standard, automatiquement commandé par toute action de freinage, qui sur ordre de l'un ou l'autre capteur bloque le retour de I'huile(9) du cylindre dans le réservoir(3) mais pas l'inverse; - Un conduit extérieur(8)au cylindre qui permet!a libre circulation de l'huile entre le réservoir séparé(3) et la capacité située sous le piston noyé(4) dont le volume ne cesse de varier en fonction des mouvements du 2 0 piston. Ce conduit(8) relie la base du cylindre principal(11) au canal de liaison(10) situé entre le cylindre et son réservoir, en amont de l'élelectro-clapet(1).  Referring to these drawings the device consists of a separate reservoir damper comprising a number of original and essential arrangements allowing it to instantly limit the stroke of the piston (4) of the main cylinder (11) during braking on order sensors located on the master cylinder of the brake lever of the handlebar and on that of the brake pedal. These arrangements concern: 1 5 - An electro-valve (1) or simply a conventional valve doubled in parallel with a standard solenoid valve, automatically controlled by any braking action, which by order of one or the other sensor blocks the return of the oil (9) of the cylinder into the tank (3) but not vice versa; - An outer conduit (8) to the cylinder which allows! Free flow of oil between the separate tank (3) and the capacity located under the drowned piston (4) whose volume continues to vary depending on the movements of the 2 0 piston. This duct (8) connects the base of the main cylinder (11) to the connecting channel (10) between the cylinder and its reservoir, upstream of the electro-valve (1).

- Une deuxième bulle de gaz sous pression(5) située dans le haut du cylindre principal(11)et isolée de l'huile par un deuxième piston flottant(2) limité dans sa course par une bague inteme(12) située dans le cylindre, juste au-dessus du canal(10)le reliant au réservoir(3).  - A second pressurized gas bubble (5) located in the top of the main cylinder (11) and isolated from the oil by a second floating piston (2) limited in its race by an inner ring (12) located in the cylinder just above the channel (10) connecting it to the tank (3).

2 5 - Un capteur de type indifférent au principe, à contact simple à titre d'exemple, commande l'électrovanne ou électro-clapet. Cet électroclapet(1) de modèle indifférent lui aussi, pourrait être constitué d'un obturateur souple se rétractant sous l'action d'un ressort(6), laissant ainsi libre circulation à l'huile(9) en temps normal et bloquant son passage lors des freinages, dans un seul sens sous l'action répulsive de l'électroaimant(7) qui vient loger cet obturateur contre une butée. Sa souplesse lui permettrait de s'écarter et de laisser passer l'huile 3 0 dans l'autre sens; ceci à titre d'exemple du principe de fonctionnement.  5 - A type sensor indifferent to the principle, single contact by way of example, controls the solenoid valve or electro-valve. This electroclaplet (1) of indifferent model too, could consist of a flexible shutter retracting under the action of a spring (6), leaving free circulation to the oil (9) in normal time and blocking its passage during braking, in one direction under the repulsive action of the electromagnet (7) which accommodates this shutter against a stop. Its flexibility would allow it to deviate and let the oil 30 in the other direction; this as an example of the operating principle.

- Le piston noyé(4) est hermétique et non plus à débit de fuite contrôlée de manière à ne plus continuer à s 'enfoncer!ors des freinages, lorsque l'électro-clapet est fermé ; cette modification impose la création du conduit de liaison(8) entre la base du cylindre et le réservoir(3).  - The embedded piston (4) is hermetic and no longer controlled leakage rate so as not to continue to sinking! Or braking when the electro-valve is closed; this modification imposes the creation of the connecting pipe (8) between the base of the cylinder and the reservoir (3).

Le dispositif selon l'invention est particulièrement destiné à équiper les suspensions des fourches avant 3 5 des motos et ainsi réduire, voire éviter le phénomène de plongée c'est à dire l'enfoncement de l'avant de la moto qui est aussi désagréable que potentiellement dangereux.  The device according to the invention is particularly intended to equip the suspensions of the forks before 35 motorcycles and thus reduce or even avoid the phenomenon of diving that is to say the depression of the front of the bike which is as unpleasant as potentially dangerous.

Claims (8)

REVENDICATIONS 1) Dispositif antiplongée pour fourche avant de moto caractérisé en ce qu'il est constitué d'un amortisseur à réservoir séparé(3) auquel ont été apportés plusieurs aménagements de manière à lui permettre de pouvoir réduire sa course lors des freinages.  1) Anti-dive device for motorcycle front fork characterized in that it consists of a separate reservoir damper (3) which has been made several arrangements so as to allow it to reduce its stroke during braking. 2) Dispositif antiplongée pour fourche avant de moto selon la revendication 1 caractérisé en ce qu'il 5 comporte un électro-clapet(1) ou simplement d'un clapet doublé en parallèle d'une électrovanne destiné à bloquer le retour de l'huile(9) dans le réservoir séparé(3) lors des freinages.  2) Anti-dive device for motorcycle front fork according to claim 1 characterized in that it comprises an electro-valve (1) or simply a valve lined in parallel with a solenoid valve for blocking the return of the oil (9) in the separate tank (3) during braking. 3) Dispositif antiplongée pour fourche avant de moto selon la revendication 2 caractérisé en ce que cet électro-clapet est automatiquement commandé par toute action de freinage au moyen de capteurs situés l'un sur le maître cylindre de la pédale de frein et l'autre situé sur le maître cylindre du levier de frein avant au guidon,  3) Anti-dive device for motorcycle front fork according to claim 2 characterized in that this electro-valve is automatically controlled by any braking action by means of sensors located one on the master cylinder of the brake pedal and the other located on the master cylinder of the front brake lever on the handlebars, 4) Dispositif antiplongée pour fourche avant de moto selon la revendication 2 caractérisé en ce que cet électro-clapet est placé dans un canal de liaison(10) entre le cylindre principal(11) et son réservoir séparé(3).4) Anti-dive device for motorcycle front fork according to claim 2 characterized in that this electro-valve is placed in a connecting channel (10) between the main cylinder (11) and its separate reservoir (3). 5) Dispositif antiplongée pour fourche avant de moto selon la revendication 1 caractérisé en ce qu'il comporte un conduit(8) reliant la base du cylindre principal(11) et le réservoir séparé(3) afin de permettre une 1 5 libre circulation de l'huile(9) remplissant la capacité située sous un piston noyé(4) et dont le volume ne cesse de varier en fonction des mouvements du piston.  5) Anti-dive device for motorcycle front fork according to claim 1 characterized in that it comprises a conduit (8) connecting the base of the main cylinder (11) and the separate reservoir (3) to allow a free movement of the oil (9) filling the capacity located under an embedded piston (4) and whose volume varies continuously depending on the movements of the piston. 6) Dispositif antiplongée pour fourche avant de moto selon la revendication 1 caractérisé en ce qu'un piston noyé(4) est hermétique et non plus à débit de fuite contrôlée.  6) Anti-dive device for motorcycle front fork according to claim 1 characterized in that an embedded piston (4) is hermetic and no longer controlled leakage rate. 7) Dispositif antiplongée pour fourche avant de moto selon la revendication 1 caractérisé en ce qu'une 20 deuxième bulle de gaz sous pression(5) est située dans le haut du cylindre principal(11) isolée de l'huile(9) par un deuxième piston flottant(2) .  7) anti-dive device for motorcycle front fork according to claim 1 characterized in that a second pressurized gas bubble (5) is located in the top of the main cylinder (11) isolated from the oil (9) by a second floating piston (2). 8) Dispositif antiplongée pour fourche avant de moto selon la revendication 7 caractérisé en ce que ce deuxième piston flottant(2) est limité dans sa course par une bague inteme(12) située juste au-dessus d'un canal (10) reliant le cylindre principal(11) à son réservoir(3).8) Anti-dive device for motorcycle front fork according to claim 7 characterized in that the second floating piston (2) is limited in its race by an inner ring (12) located just above a channel (10) connecting the main cylinder (11) to its reservoir (3).
FR0403467A 2004-04-02 2004-04-02 Anti-dive device for motorcycle front fork, has damper with separated reservoir comprising electro-valve permitting to instantaneously limit stroke of piston of main cylinder while braking by blocking return of oil in reservoir Pending FR2868390A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0403467A FR2868390A1 (en) 2004-04-02 2004-04-02 Anti-dive device for motorcycle front fork, has damper with separated reservoir comprising electro-valve permitting to instantaneously limit stroke of piston of main cylinder while braking by blocking return of oil in reservoir

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0403467A FR2868390A1 (en) 2004-04-02 2004-04-02 Anti-dive device for motorcycle front fork, has damper with separated reservoir comprising electro-valve permitting to instantaneously limit stroke of piston of main cylinder while braking by blocking return of oil in reservoir

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FR2868390A1 true FR2868390A1 (en) 2005-10-07

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FR0403467A Pending FR2868390A1 (en) 2004-04-02 2004-04-02 Anti-dive device for motorcycle front fork, has damper with separated reservoir comprising electro-valve permitting to instantaneously limit stroke of piston of main cylinder while braking by blocking return of oil in reservoir

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FR (1) FR2868390A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2919908A1 (en) * 2007-08-08 2009-02-13 Peugeot Citroen Automobiles Sa Shock absorber for motor vehicle, has compression chamber communicating with hydraulic chamber forming hydraulic buffer via pipe, where chamber includes pressure spring exerting permanent pressure on variable volume of hydraulic chamber

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2919908A1 (en) * 2007-08-08 2009-02-13 Peugeot Citroen Automobiles Sa Shock absorber for motor vehicle, has compression chamber communicating with hydraulic chamber forming hydraulic buffer via pipe, where chamber includes pressure spring exerting permanent pressure on variable volume of hydraulic chamber

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