FR2504082A1 - FRONT FORK FOR MOTORCYCLES - Google Patents
FRONT FORK FOR MOTORCYCLES Download PDFInfo
- Publication number
- FR2504082A1 FR2504082A1 FR8206623A FR8206623A FR2504082A1 FR 2504082 A1 FR2504082 A1 FR 2504082A1 FR 8206623 A FR8206623 A FR 8206623A FR 8206623 A FR8206623 A FR 8206623A FR 2504082 A1 FR2504082 A1 FR 2504082A1
- Authority
- FR
- France
- Prior art keywords
- tube
- front fork
- motorcycles
- guide rings
- lower tube
- 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.)
- Pending
Links
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
-
- 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
- B62K21/00—Steering devices
- B62K21/02—Front wheel forks or equivalent, e.g. single tine
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
- Axle Suspensions And Sidecars For Cycles (AREA)
Abstract
L'INVENTION CONCERNE UNE FOURCHE AVANT POUR MOTOCYCLETTES ET ANALOGUES DU TYPE COMPRENANT UN TUBE INFERIEUR 2 PORTANT A SON EXTREMITE INFERIEURE L'AXE DE LA ROUE AVANT ET UN TUBE DE DIRECTION 5 ENGAGE A L'INTERIEUR DE CE TUBE INFERIEUR ET COMPORTANT DES POIGNEES A SON EXTREMITE SUPERIEURE. CONFORMEMENT A L'INVENTION, LA FOURCHE COMPREND EGALEMENT UNE PLURALITE DE BAGUES DE GUIDAGE 13A, 13B A L'INTERIEUR DESQUELLES COULISSE LE TUBE DE DIRECTION 5 ET QUI SONT PLACEES SELON UN ECARTEMENT DETERMINE A L'INTERIEUR DU TUBE INFERIEUR 2.THE INVENTION CONCERNS A FRONT FORK FOR MOTORCYCLES AND THE LIKE OF THE TYPE INCLUDING A LOWER TUBE 2 CARRYING AT ITS LOWER END THE AXLE OF THE FRONT WHEEL AND A STEERING TUBE 5 ENGAGED INSIDE THIS LOWER TUBE AND INCLUDING HANDLES A ITS UPPER END. IN ACCORDANCE WITH THE INVENTION, THE FORK ALSO INCLUDES A PLURALITY OF GUIDE RINGS 13A, 13B INSIDE WHICH THE STEERING TUBE 5 SLIDES AND WHICH ARE PLACED ACCORDING TO A DETERMINED GAP INSIDE THE LOWER TUBE 2.
Description
Fourche avant pour motocyclettes.Front fork for motorcycles.
Cette invention concerne des fourches avant pour motocyclet- This invention relates to front forks for motorcycles
tes et analogues.and analogs.
Dans les modes de construction antérieurs de fourches avant pour motocyclettes, comme on le voit sur les figures 1 et 2 des dessins ciannexés, un tube de direction ou tube de fourche 5, à l'extrémité supérieure duquel des poignées 4 sont fixées au moyen de deux ferrures 3 et 3 ', coulisse In the earlier modes of construction of front forks for motorcycles, as seen in Figures 1 and 2 of the accompanying drawings, a steering tube or fork tube 5, at the upper end of which handles 4 are fixed by means of two fittings 3 and 3 ', slide
dans un tube inférieur ou fourreau 2, qui porte à son extré- in a lower tube or sheath 2, which carries at its end
mité inférieure l'axe 1 de la roue avant Pour réduire le frottement entre le tube inférieur 2 et le tube de direction , comme indiqué sur la figure 2, on prévoit une rainure lower the axis 1 of the front wheel To reduce the friction between the lower tube 2 and the steering tube, as shown in Figure 2, there is provided a groove
annulaire 6 pratiquée sur la paroi extérieure du tube de di- ring 6 formed on the outer wall of the tube of di-
rection 5 et une bague de guidage 7 adaptée et fixée à l'intérieur de cette rainure 6 de façon à ce que la surface rection 5 and a guide ring 7 adapted and fixed inside this groove 6 so that the surface
externe de la bague de guidage 7 puisse coulisser à l'inté- the outer ring of the guide ring 7 can slide
rieur du fourreau 2, et on prévoit également une région sheath 2, and a region is also planned
annulaire 8 de diamètre supérieur située à l'extrémité su- ring 8 of larger diameter at the upper end
périeure du fourreau 2, dans laquelle est fixé une bague de guidage 9, de sorte que la surface interne de la bague de guidage puisse glisser sur la surface extérieure du tube upper sleeve 2, in which is fixed a guide ring 9, so that the inner surface of the guide ring can slide on the outer surface of the tube
de direction 5.Direction 5.
De façon à empêcher les fuites d'huile entre le tube infé- In order to prevent oil leakage between the lower tube
rieur 2 et le tube de direction 5 et à maintenir en place la bague de guidage 9, un circlip 12 est fixé entre un joint d'étanchéité 10 et une bague ou rondelle Il à l'extrémité supérieure du fourreau 2 De plus, on prévoit sous le 2 and the steering tube 5 and keep in place the guide ring 9, a circlip 12 is fixed between a seal 10 and a ring or washer Il at the upper end of the sleeve 2 In addition, provision is made under the
tube de direction 5 un mécanisme de butée (non représenté). steering tube 5 a stop mechanism (not shown).
Dans la mesure o la fourche avant est légèrement inclinée par rapport à la verticale comme on le voit sur la figure 1, elle est normalement soumise à la force latérale Si l'on ajoute la charge de fonctionnement et si la distance D entre les bagues de guidage 7 et 9 augmente, par suite du mouvement télescopique, des charges supérieures agiront sur les bagues de guidage 7 et 9, ce qui aura pour effet Since the front fork is slightly inclined to the vertical as shown in Figure 1, it is normally subject to lateral force. If the operating load is added and the distance D between the bushings 7 and 9 increases as a result of the telescopic movement, higher loads will act on the guide rings 7 and 9, which will have the effect of
d'accroître l'usure de ces bagues et des pièces connexes. to increase the wear of these rings and related parts.
Etant donné que le point d'application de la force latéra- Since the point of application of lateral force
le au tube de direction 5 varie en fonction de la position longitudinale dudit tube, les bagues subiront l'essentiel de l'usure, ce qui risque de compromettre les performances the to the steering tube 5 varies depending on the longitudinal position of said tube, the rings will suffer most of the wear, which may compromise performance
et la résistance du système de butée. and the resistance of the stop system.
Conformément à l'invention, on prévoit une pluralité de In accordance with the invention, a plurality of
bagues de guidage à l'intérieur desquels le tube de four- guide rings inside which the tube of furnace
che peut coulisser et qui sont fixées selon un écartement che can slide and which are fixed according to a spacing
prédéterminé à l'intérieur du fourreau. predetermined inside the sheath.
Une forme de réalisation de l'invention est décrite ci- An embodiment of the invention is described below.
après à titre d'exemple, en référence à la figure 3 des dessins ciannexés, qui est une vue en coupe longitudinale by way of example, with reference to FIG. 3 of the accompanying drawings, which is a longitudinal sectional view
d'une fourche selon l'invention.a fork according to the invention.
Comme on le voit sur ce dessin, on prévoit un tube infé- As can be seen in this drawing, an inferior tube is
rieur (ou fourreau) 2, qui présente une portion 2 a de dia- (or sleeve) 2, which has a portion 2a of dia-
mètre légèrement supérieur à son extrémité dans laquelle prend place un tube de direction 5; aux deux extrémités de la portion 2 a se trouvent des bagues de guidage 13 a et 13 b, tenues selon un écartement donné par des circlips 14 a et 14 b Au lieu des circlips, on peut insérer entre les bagues de guidage une bague ou frette 15 de façon à les maintenir comme indiqué par les pointillés sur la meter slightly above its end in which takes place a steering tube 5; at both ends of the portion 2a are guide rings 13a and 13b, held at spacing given by circlips 14a and 14b Instead of the circlips, can be inserted between the guide rings a ring or hoop 15 to keep them as indicated by the dashed lines on the
figure 3.figure 3.
Ainsi, même au moment de l'extension maximum des tubes 2 et 5, la distance D entre les bagues de guidage 13 a et Thus, even at the time of the maximum extension of the tubes 2 and 5, the distance D between the guide rings 13 has and
13 b demeure constante et, par conséquent, même si la char- 13 b remains constant and, therefore, even if the
ge provoque une force latérale, le frottement sera moindre et l'usure sera réduite en conséquence De plus, la surface interne du tube inférieur 2 pourra n'être finie de façon précise que pour la distance plus courte de fixation des As a result, the internal surface of the lower tube 2 may be finely finished only for the shorter distance of the fastening of the elements.
bagues de guidage 13 a et 13 b.guide rings 13a and 13b.
Sur le mode de réalisation représenté, la portion 2 a de In the embodiment shown, the portion 2 has
diamètre accru se trouve à l'extrémité du tube inférieur 2. increased diameter is at the end of the lower tube 2.
Toutefois, sous réserve que la bague de guidage inférieure 13 b coopère à coulissement avec l'extrémité inférieure du tube de direction 5 au point d'extension maximum, cette portion plus large peut très bien se situer vers le milieu du tube 2, ou bien encore on peut prévoir deux bagues de However, provided that the lower guide ring 13b slidably cooperates with the lower end of the steering tube 5 at the point of maximum extension, this wider portion may very well be located towards the middle of the tube 2, or still two rings of
guidage supplémentaires ou davantage. additional guidance or more.
Comme on vient de le montrer, si la réalisation est confor- As we have just shown, if the realization is in conformity
me à la présente invention, et ce malgré la simplicité de l'agencement, la charge partielle des bagues de guidage et pièces connexes du tube de direction peut être réduite, ce qui permet d'obtenir une fourche avant de plus longue In spite of the simplicity of the arrangement, the partial load of the guide rings and related parts of the steering tube can be reduced, which makes it possible to obtain a longer front fork.
durée de vie.lifetime.
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5525881U JPS57166990U (en) | 1981-04-17 | 1981-04-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2504082A1 true FR2504082A1 (en) | 1982-10-22 |
Family
ID=12993564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8206623A Pending FR2504082A1 (en) | 1981-04-17 | 1982-04-16 | FRONT FORK FOR MOTORCYCLES |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS57166990U (en) |
BR (1) | BR8202222A (en) |
DE (1) | DE3213904A1 (en) |
FR (1) | FR2504082A1 (en) |
GB (1) | GB2096953B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2615472A1 (en) * | 1987-05-22 | 1988-11-25 | Weecksteen Fabrice | Stiffening extending device for front fork tees for motor cycles |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005308196A (en) * | 2003-06-10 | 2005-11-04 | Showa Corp | Front fork in two-wheeled vehicle or the like |
DE102008009426A1 (en) * | 2008-02-15 | 2009-08-20 | Stephan Albrecht | fork |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE494450A (en) * | ||||
FR1066837A (en) * | 1952-03-25 | 1954-06-10 | Motobecane Ateliers | Improvements to telescopic elastic forks |
FR1091192A (en) * | 1954-01-07 | 1955-04-07 | Telescopic forks for mopeds, motorcycles and other vehicles likely to receive their application in order to ensure their elastic suspension | |
FR63770E (en) * | 1953-01-31 | 1955-10-03 | Elastic fork with telescopic elements for motor bicycles or the like | |
FR65155E (en) * | 1954-01-21 | 1956-01-27 | Mecafor | Elastic fork for motor bicycles or the like |
US2756070A (en) * | 1950-04-14 | 1956-07-24 | Torre Pier Luigi | Spring suspension system for motorcycle front wheels |
DE1251173B (en) * | 1967-09-28 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1680573A1 (en) * | 1966-05-11 | 1970-07-09 | Hercules Nuernberg Gmbh | Telescopic fork, especially for the front wheels of two-wheeled vehicles |
-
1981
- 1981-04-17 JP JP5525881U patent/JPS57166990U/ja active Pending
-
1982
- 1982-04-07 GB GB8210309A patent/GB2096953B/en not_active Expired
- 1982-04-15 DE DE19823213904 patent/DE3213904A1/en not_active Ceased
- 1982-04-16 FR FR8206623A patent/FR2504082A1/en active Pending
- 1982-04-16 BR BR8202222A patent/BR8202222A/en not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE494450A (en) * | ||||
DE1251173B (en) * | 1967-09-28 | |||
US2756070A (en) * | 1950-04-14 | 1956-07-24 | Torre Pier Luigi | Spring suspension system for motorcycle front wheels |
FR1066837A (en) * | 1952-03-25 | 1954-06-10 | Motobecane Ateliers | Improvements to telescopic elastic forks |
FR63770E (en) * | 1953-01-31 | 1955-10-03 | Elastic fork with telescopic elements for motor bicycles or the like | |
FR1091192A (en) * | 1954-01-07 | 1955-04-07 | Telescopic forks for mopeds, motorcycles and other vehicles likely to receive their application in order to ensure their elastic suspension | |
FR65155E (en) * | 1954-01-21 | 1956-01-27 | Mecafor | Elastic fork for motor bicycles or the like |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2615472A1 (en) * | 1987-05-22 | 1988-11-25 | Weecksteen Fabrice | Stiffening extending device for front fork tees for motor cycles |
Also Published As
Publication number | Publication date |
---|---|
BR8202222A (en) | 1983-03-29 |
JPS57166990U (en) | 1982-10-21 |
DE3213904A1 (en) | 1982-11-18 |
GB2096953A (en) | 1982-10-27 |
GB2096953B (en) | 1984-10-24 |
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