Fluid pressure damper

A fluid pressure dumper comprising:

• a cylinder tube;
• a piston rod inserted into the cylinder tube so as to be freely movable into and out of the cylinder tube;
• a piston connected to the piston rod, the piston being configured to partition an interior of the cylinder tube into a first pressure chamber and a second pressure chamber;
• and
• a damping unit configured to generate damping force by imparting resistance to a flow of working fluid between the first pressure chamber and the second pressure chamber, wherein the damping unit has:
• a fluid passage configured to guide the working fluid flowing from the first pressure chamber towards the second pressure chamber;
• a damping valve provided in the fluid passage, the damping valve being configured to impart variable resistance to the flow of the working fluid passing therethrough depending on positions;
• a bypass passage connected to the fluid passage so as to bypass the damping valve;
• a solenoid valve provided in the bypass passage, the solenoid valve being configured to guide a part of the working fluid in the bypass passage to the damping valve as a pilot pressure;
• a first restrictor portion configured to impart resistance to the flow of the working fluid guided to the solenoid valve from the first pressure chamber through the bypass passage;
• and
• a first relief valve configured to open when a pressure in the bypass passage reaches a predetermined relief pressure to release the pressure in the bypass passage to the second pressure chamber through the fluid passage.