Patent ID: 8695551

Claim:
A hydraulic lash adjuster, comprising: a body defining an axial bore and having an open end and a closed end; a hollow piston telescopically received within the axial bore and defining a fluid reservoir, wherein the hollow piston has a first end disposed within the axial bore and a second end extending outwardly beyond the open end of the body; a high pressure volume defined by the axial bore and the first end of the hollow piston; and a valve mechanism positioned through an opening of the hollow piston and including a valve member having an open position defining a fluid path from the fluid reservoir to the high pressure volume and a closed position in which the fluid reservoir is fluidly blocked from the high pressure volume at the opening; wherein the hollow piston includes a band of radial recirculation openings defining recirculation paths from the high pressure volume to the fluid reservoir along an exterior of the hollow piston, wherein a diameter of each of the radial recirculation openings is smaller than a width of the band.