Mando Corporation

Ki Don Jung

Hark Joo Kim

Myeong Su Hwang

The present disclosure relates to a damping force variable valve assembly, which is installed in a damping force variable shock absorber for adjustment of a damping force of the shock absorber, includes at least: a solenoid that generates a magnetic force when an electric current is supplied thereto; a plunger configured to be moved by the magnetic force of the solenoid; a spool that is moved together with the plunger and change a damping force between a hard mode and a soft mode by changing an inner passage of the damping force variable valve assembly; and a spool position determination member that locates the spool at a fail position, which does not correspond to the hard mode and the soft mode, so as to maintain the damping force of the shock absorber at a medium level between the hard mode and the soft mode upon fail of the solenoid.

Damping force variable valve assembly and damping force variable shock absorber including the same

A damping force variable type shock absorber includes: a piston rod reciprocating within the cylinder; a piston valve connected to the piston rod to partition the cylinder into a compression chamber and a rebound chamber; a housing including an auxiliary chamber communicating with a connection passage penetrating an inside of the piston rod in a longitudinal direction of the piston rod, the housing being connected to a lower portion of the piston valve and forming an auxiliary passage connected to the compression chamber disposed thereunder; a first damping unit disposed in an upper side of the auxiliary chamber to form a first bypass passage communicating the connection passage with the auxiliary passage in a zigzag form, the first damping unit allowing a deformation according to a flow of a working fluid in a predetermined speed section; a second damping unit accommodated in the auxiliary chamber and disposed under the first damping unit to form a second bypass passage connected to the first bypass passage, the second damping unit allowing a deformation according to the flow of the working fluid in a predetermined speed section; and a seal unit accommodated in the auxiliary chamber and disposed under the first damping unit to vertically support the second damping unit. Accordingly, it is possible to improve ride comfort by bypassing the working fluid while allowing a deformation along the flow of the working fluid in a predetermined speed section.

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Seongnam-si, South Korea

Ki Don Jung