To provide a hydraulic damper for a vehicle enabling an increase in damping force characteristics during extension in the low piston speed range.
In this hydraulic damper 1 for the vehicle, a piston 4 dividing the inside of a cylinder 2 into a compression side oil chamber A and an extension side oil chamber B is installed at the tip of a piston rod 3 inserted into the cylinder 2, and extension side and compression side main passages 42 and 41 to communicate the compression side oil chamber A with the extension side oil chamber B are formed in the piston 4. An extension main valve 6 formed of an annular plate valve and opening during the extension stroke and a compression main valve 7 opening during the compression stroke are disposed in compression chamber side openings 42a and 41b opening to the compression side oil chamber A of the extension side and compression side main passages 42 and 41 and extension chamber side openings 42b and 41a opening to the extension side oil chamber B. An extension auxiliary valve 11 communicating the compression side oil chamber A with the extension side oil chamber B at the beginning of the extension stroke of the piston 4 is installed in the hydraulic damper.
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Masanori Fujisawa
Shotaro Fujisawa