US 11,680,622 B2
Frequency sensitive type shock absorber
Kyudo Kim, Seoul (KR); Dongwon Kang, Yongin-si (KR); Namho Kim, Yongin-si (KR); and Hyunsoo Park, Seongnam-si (KR)
Assigned to HL Mando Corporation, Pyeongtaek-si (KR)
Filed by HL MANDO CORPORATION, Pyeongtaek-si (KR)
Filed on Jun. 12, 2020, as Appl. No. 16/899,951.
Claims priority of application No. 10-2019-0069359 (KR), filed on Jun. 12, 2019.
Prior Publication US 2020/0393015 A1, Dec. 17, 2020
Int. Cl. F16F 9/504 (2006.01); F16F 9/19 (2006.01); F16F 9/348 (2006.01); F16F 9/32 (2006.01); B60G 13/08 (2006.01); B60G 17/08 (2006.01)
CPC F16F 9/504 (2013.01) [F16F 9/19 (2013.01); F16F 9/3221 (2013.01); F16F 9/348 (2013.01); B60G 13/08 (2013.01); B60G 17/08 (2013.01); B60G 2202/24 (2013.01); B60G 2206/41 (2013.01); B60G 2500/11 (2013.01); B60G 2800/162 (2013.01); F16F 2222/12 (2013.01); F16F 2228/04 (2013.01); F16F 2228/066 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A frequency sensitive type shock absorber comprising:
a piston rod reciprocating an inside of a cylinder and having a connection passage therein;
a piston valve mounted on the piston rod and having a plurality of compression and rebound flow paths penetrating up and down thereof, and partitioning the cylinder into compression and rebound chambers; and
a valve assembly mounted on the piston rod to generate a damping force that changes with frequency during a rebound stroke;
wherein the valve assembly comprises:
a housing coupled to the piston rod and having a pilot chamber in communication with the connection passage;
a main retainer coupled to the piston rod and having a main chamber formed on an upper portion thereof in communication with the connection passage;
a first pilot valve coupled to the piston rod and disposed between the housing and the main retainer to partition the pilot chamber and the main chamber; and
a second pilot valve coupled to the piston rod and disposed above the pilot chamber and configure to be elastically deformable depending on a change in pressure of the pilot chamber, and
the frequency sensitive type shock absorber further comprises an inlet disc interposed between the housing and the first pilot valve and having at least one slit communicating the connection passage and the pilot chamber.