Patent ID: 8157065
Filing Date: 2012-04-17
Classification: F16F

Abstract:
1. A shock absorber comprising: a cylinder having a fluid sealed therein; a piston slidably provided in the cylinder; a piston rod connected to the piston and extending out of the cylinder; a passage in which a flow of fluid is induced by sliding movement of the piston in the cylinder; and a damping force generating mechanism having a disk valve provided in the passage; the damping force generating mechanism comprising: a valve body provided with an opening of the passage; a circular main seat portion projecting from the valve body to surround the opening, the main seat portion forming a main valve chamber communicating directly with the passage, the disk valve being seated on the main seat portion; a sub-seat portion projecting from the valve body toward the disk valve at an inner peripheral side of the main seat portion, the sub-seat portion forming, in cooperation with the main seat portion, a sub-valve chamber partitioned from the opening; and a pressing member that presses the disk valve toward the main seat portion at the inner peripheral side of the main seat portion, wherein the sub-seat portion comprises an arcuate portion concentric with the main seat portion and a radial portion extending radially from the arcuate portion to the main seat portion, the arcuate portion and the radial portion having a same projection height, the main valve chamber and the sub-valve chamber being always in communication with each other through a substantially triangular clearance defined between the radial portion and the disk valve.