US 12,031,604 B2
Vibration damper having a two-stage restricted damping force control
Dmitrij Smeljanskij, Leverkusen (DE); and Benjamin Maslowski, Remscheid (DE)
Assigned to thyssenkrupp Bilstein GmbH, Ennepetal (DE); and thyssenkrupp AG, Essen (DE)
Filed by thyssenkrupp Bilstein GmbH, Ennepetal (DE); and thyssenkrupp AG, Essen (DE)
Filed on Dec. 7, 2021, as Appl. No. 17/544,465.
Claims priority of application No. 10 2020 215 480.5 (DE), filed on Dec. 8, 2020.
Prior Publication US 2022/0178418 A1, Jun. 9, 2022
Int. Cl. F16D 57/00 (2006.01); F16F 9/34 (2006.01); F16K 17/10 (2006.01); F16F 9/19 (2006.01); F16F 9/50 (2006.01)
CPC F16F 9/34 (2013.01) [F16K 17/105 (2013.01); F16F 9/19 (2013.01); F16F 9/50 (2013.01); F16F 2222/12 (2013.01); F16F 2228/066 (2013.01); F16F 2230/18 (2013.01); F16F 2232/08 (2013.01); F16F 2234/02 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A controllable vibration damper having damping force control, the controllable vibration damper comprising:
a damper tube housing filled with damping medium; and
a damping valve element that is structurally and fluidically connected to the damper tube housing for damping force control, the damping valve element having
a two-stage pre-throttle valve assembly having a fixed pre-throttle valve disposed in series with a switchable pre-throttle valve as part of the two-stage pre-throttle valve placed in front of and in series with a pilot valve.