| 摘要 |
<p>The present invention relates to a reinforcement structure of a vehicle body frame comprising a reinforcing member (31) interconnecting two points to be reinforced of the vehicle body frame (101A) and having a damping force generating means generating a viscous damping force against axial deformation of the reinforcing member (31) caused by relative motion between these points of the vehicle body frame (101A) during the running of the vehicle (100) to reduce vibratory deformation of the vehicle body frame (101A), wherein the damping force generating means comprises a hydraulic damper (32), in particular an oil damper, for generating the damping force by means of a hydraulic liquid, wherein the hydraulic damper (32) has a cylinder (36), a piston (41), a piston rod (33), oil chambers (51,52) defined by the piston (41), and at least one orifice (41a,41b), and both oil chambers (51,52) are mutually communicated through the orifice (41a,41b), and wherein a damping force characteristic on a compression side of the axial deformation of the damping force generating means is different from that on a tension side of the axial deformation of the damping force generating means.
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