DAMPING VALVE FOR SHOCK ABSORBER

摘要

This invention obtains damping force in choke characteristics when piston speed is in low-speed region, and reduces damping force when piston speed is in medium-high-speed region. A damping valve for a shock absorber includes a piston partitioning an extension-side chamber from a pressure-side chamber, a returner laminated to pressure-side chamber side of piston, a flow passage penetrating from piston to returner and having entrance constantly communicating with expansion-side chamber, a leaf valve laminated to retainer and operably closing an exit of expansion-side flow passage, a first outer peripheral groove formed on outer periphery of piston rod. A passage T functioning as a choke is formed between first outer peripheral groove and retainer. One side of passage communicates with flow passage and other side thereof communicates with compression-side chamber.

主权项

1. A damping valve for a shock absorber, comprising:
a valve disc configured to partition one chamber and another chamber; a retainer laminated on another chamber side of the valve disc; a flow passage penetrating from the valve disc to the retainer and having an entrance constantly communicating with the one chamber; an annular plate-shaped leaf valve laminated on a side of the retainer opposite to the valve disc and configured to openably close an exit of the flow passage; a shaft member penetrating through axial center holes of the valve disc, the retainer and the leaf valve; a first outer peripheral groove formed on the outer periphery of the shaft member; and a passage formed between the first outer peripheral groove and the retainer and configured to function as a choke, wherein one side of the passage communicates with the flow passage and the other side of the passage communicates with the other chamber.