Patent ID: 7896311

Claim:
A solenoid valve of a shock absorber exhibiting a damping force, the solenoid valve comprising: a disc valve having a fixed orifice formed thereon; a back pressure chamber configured to generate back pressure against the disc valve by a fluid introduced through a back pressure adjusting flow passage; a spool guide; a solenoid unit; and a spool moved in the spool guide by operation of the solenoid unit to control opening/closing or opening rate of the back pressure adjusting flow passage, wherein the back pressure adjusting flow passage includes a variable orifice with an opening rate of the variable orifice adjusted by the spool and the spool guide, the back pressure chamber, and the fixed orifice formed on the disc valve, to adjust the damping force of the shock absorber through adjustment of the back pressure against the disc valve; wherein the disc valve comprises one or more discs stacked on a ring-shaped valve sheet of a valve retainer, one or more valve springs arranged on the one or more discs, and a disc ring interposed between an outer circumference of the one or more discs and an outer circumference of the one or more valve springs, and wherein the one or more discs in close contact with the disc ring have a slit opening toward an outer circumference of the solenoid valve and the one or more valve springs in close contact with the disc ring have a slit opening toward the outer circumference of the solenoid valve.