US 11,708,125 B2
Shock absorber with bidirectional selective block, wheel group and motorcycle thereof
Andrea Raffaelli, Pisa (IT)
Assigned to PIAGGIO & C. S.P.A, Pontedera (IT)
Appl. No. 16/611,375
Filed by PIAGGIO & C. S.p.A., Pisa (IT)
PCT Filed May 4, 2018, PCT No. PCT/IB2018/053116
§ 371(c)(1), (2) Date Nov. 6, 2019,
PCT Pub. No. WO2018/207066, PCT Pub. Date Nov. 15, 2018.
Claims priority of application No. 102017000049536 (IT), filed on May 8, 2017.
Prior Publication US 2020/0156732 A1, May 21, 2020
Int. Cl. F16F 9/44 (2006.01); F16F 9/06 (2006.01); B62K 25/04 (2006.01); B62K 5/05 (2013.01); B62K 5/08 (2006.01); B62K 5/10 (2013.01)
CPC B62K 25/04 (2013.01) [B62K 5/05 (2013.01); B62K 5/08 (2013.01); B62K 5/10 (2013.01); F16F 9/062 (2013.01); F16F 9/065 (2013.01); F16F 9/44 (2013.01); B62K 2025/047 (2013.01); F16F 2222/12 (2013.01); F16F 2228/066 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A shock absorber comprising:
a main sheath and a main piston sliding inside the main sheath in a sliding direction, the main piston comprising a main rod coming out of the main sheath and a main head contained inside the main sheath, the main sheath being filled with hydraulic fluid,
the main rod and the main sheath being suitable to be mechanically connected respectively to a wheel and to a frame or vice versa,
a secondary sheath fluidically connected to the main sheath and provided with at least one damping valve comprising holes suitable to allow a calibrated passage of the hydraulic fluid of the main sheath,
wherein the secondary sheath is connected to the main sheath by a first and a second passage placed at opposite ends to the main head of the main piston, in a sliding direction, the first passage allowing the flow of fluid when the main head approaches the first passage in a compression motion and the second passage allowing the flow of fluid when the main head approaches the second passage in an extension motion,
wherein the secondary sheath comprises a control valve movable, according to a regulation stroke, between an unlocking position, in which it does not interfere with said first and second passages, and a blocking position, wherein it occludes said first and second passages, and
wherein, when the control valve is in the blocking position, the main piston is locked in position within the main sheath and is unable to move in the sliding direction.