| 摘要 |
PURPOSE:To achieve the rigidity of roll while preventing degradation of comfortability by providing an orifice for exhibiting the braking force under quite low speed and second orifice openable upon reaching of said braking force to predetermined level. CONSTITUTION:A valve seat 9 for an expansion pressure control valve is provided below a piston 2 where said valve is comprised of main valve 7 and sub valve 8 provided on the lower and upper faces of the valve seat 9 and fixed to be applied with initial pressure by deforming the planar resilient discs into pan- shape. The piston 2 is provided with oil paths 11, 12 having upper ends opened toward the upper oil chamber 3 where first orifice 14 for communicating between the upper and lower oil chambers 4, 5 is provided in the way of the oil path 12 while second orifice 16 is provided between the upper oil chamber 10 of main valve 7 communicated to the oil path 12 and the lower oil chamber 11 of sub valve 8. |
