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1. (WO1986003267) DISPOSITIF AMORTISSEUR HYDRAULIQUE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

C L A I M S

1. Hydraulic damping device for damping a relative pivotal movement of a motor cycle wheel, which is rotatably journalled at the free end portion of a fork (3;60), said fork being pivotably mounted at the frame (4) of the motor cycle, c h a— r a c t e r i z e d in that the damping device is of the kind comprising a casing (6; 6') having a sector-shaped hydraulic chamber (11; 11') in which a piston wing (23,23') is pivotable while being damped by .hydraulic fluid, and that the damping device is adapted to be mounted adjacent to the fork mounting (4a;4c) at said frame of the motor cycle with said casing (6;6) secured to the fork (3; 59,60) or to said frame and with a shaft (8;8'), connected to said piston wing (23;23'), secured to said frame (4b;4c) or said fork, respectively, in coaxial alignment with the pivot axis (A) of said fork.

2. Hydraulic damping device according to claim 1, c h a r a c-. fcerizβd in that said shaft (8;8') is sealed (20,21;) axially on both sides of said wing (23;23') in said casing ( 6 ; 6 ' ) .

3. Hydraulic damping device according to claim 1 or 2, c h a- r a c t e r i z e d in that said shaft (8; 8') is journalled in a cylindrical chamber (18; 18') adjoining said sector-shaped chamber (11; 11'), the wall of said cylindrical chamber
enclosing said shaft in an angular region exceeding 180°.

4. Hydraulic damping device according to anyone of claims 1-3 comprising at least one bypass channel (24) in said casing (6) with connecting ports (24a, 24b) located adjacent to the two end positions of said piston wing (23), wherein spring-loaded valve means (34-37) are provided to control the damping effect, c h a r a c t e r i z e d in that said springloaded valve means (34-37) aren adapted to permit a slow bypass flow of the -hydraulic fluid but- to close the valve upon exceeding a predetermined flow valve.

5. Hydraulic damping device according to claim 4, c h a r a c t e r i z e d in that valve means comprise two valve balls (34,35) each being movable between an opening position and a closing position against a valve seat (36,37) disposed at each end of a tube portion (38) forming a part of said by-pass channel (24), wherein spring means are arranged so as to urge each ball (34,35) towaxds said opening position.

6. Hydraulic damping device according to claim 5, c h r a ct e r i z e d in that said spring means comprises a pressure spring (42) extending through the whole length of said tube portion (38) , each end of the pressure spring acting on one of said valve balls (34,35).

7. Hydraulic damping device according to claim 5 or 6, c h a — a c t e r i z e d in that each ball (34,35), in said
opeining position, abuts a stop means (39,40) permitting said hydraulic fluid to flow externally passed the ball.

8. Hydraulic damping device according to anyone of claims
4-7, wherein said casing (6) comprises a primary bypass channel (24) with connecting ports (24a, 24b) located adjacent to the end positions of said piston wing (23), said primary bypass channel being provided with choke means (27) so as to effect a desired damping effect, and two secondary bypass channels (25,26) located on each side of a central angular region and having a substantially greater flow capacity than said primary bypass channel (24), whereby said damping effect is obtained only in said central angular region, c h a r a c t e r i z e d in that the device is adapted to be mounted with said shaft (8) in alignment with the pivot axis (A) of the front wheel fork (3) of the motor cycle, and in that said spring-loaded valve means are also disposed in said primary bypass channel (24).

9. Hydraulic damping device according to anyone of claims 4- 8, wherein said casing (6) comprises a primary bypass channel (24) with connecting ports (24a, 24b) located adjacent to the end positions of said piston wing (23), said primary bypass channel being provided with means (27) so as to effect a desired damping effect, and two secondary bypass channels (25,26) located on each side of a central angular region and having a substantially greater flow capacity than said primary bypass channels (24), whereby said damping effect is obtained only in said central angular region , c h a r a c t e r i z e d in that the effective length of each of said secondary bypass channels (25,26) is adjustable, whereby the range of said central angular region is variable.

10. Hydraulic damping device according to claim 9, c h a r a c t e r i z e d in that each of said secondary bypass channels (25,26) includes a connecting port (45,46) located adjacent to an end position of said piston wing (23) and at least two selectable connecting ports (47a-d, 48a-d)adjacent to said central angular region, the range of the latter being
adjustable by setting means (49,50) adapted to enable selection of one of said selectable connecting ports (47 a-d, 48 a-d).

11. Hydraulic damping device according to claim 10, c h a r a c t e r i z e d in that said setting means comprises a
rotatable sleeve (49,50) having a number of radial openings (56 a-d, 57 a-d) being mutually displaced axially and
circumferentially so as to register with a corresponding one of said selectable connecting ports (47 a-d, 48 a-d) upon rotation of said sleeve (49,50), said sleeve being rotatable from the outside of said casing (6).

12. Hydraulic damping device according to anyone of claims 1-7, c h a r a c t e r i z e d in that the device is adapted to be mounted with said shaft (8') in alignment with the pivot axis (4c) of the back wheel fork (60) of the motor cycle and in that at least two bypass (62,64) channels are provided in said casing, a first one (62) of these channels including a check valve (63) so as to permit a rapid upward movement of the back wheel fork (6) with a low damping and a slow downward movement of the same with high damping.

13. Hydraulic damping device according to claim 12, c h ar a c t e r i z e d in that a second one (64) of said bypass channels comprises at least one adjustable choking means
(72,73) .

14. Hydraulic damping device according to claim 13 or 14, c h a r a c t e r i z e d in that a second one of said bypass
channels comprises a spring-loaded valve means permitting only a slow bypass flow of the hydraulic liquid.

15. Hydraulic damping device according to claim 13 or 14, c h ar a c t e r i z e in that a further choking means (73) is adapted to provide an increased rebound damping for large movements of the back wheel fork (60).