Outer housing for a hydraulic lash adjuster with tapered oil feed annulus

A hydraulic lash adjuster comprising:

• an outer housing having an annular body with an open first axial end, a closed second axial end, a radially inner wall defining an axial bore, and a radially outer wall, the radially outer wall includes a first annular groove located adjacent to the first axial end;
• a first port located in the first annular groove;
• and
• a radially outer surface of the first annular groove tapers radially inwardly between a first axial end and a center-point of the first port.

A valve train for an internal combustion engine comprising:

• a cylinder head including a bore and a plurality of hydraulic fluid galleries;
• an outer housing positioned in the bore of the cylinder head and having an annular body with an open first axial end, a closed second axial end, a radially inner wall defining an axial bore, and a radially outer wall, the radially outer wall includes a first annular groove located adjacent to the first axial end;
• a first port located in the first annular groove and in communication with a first hydraulic fluid gallery of the plurality of hydraulic fluid galleries;
• a radially outer surface of the first groove tapers radially inwardly between a first axial end and a second axial end;
• a plunger that is axially displaceable within the axial bore of the annular body;
• and
• a rocker arm assembly in abutment with the plunger that is actuatable between a first and second valve lift mode via a hydraulic fluid feed from the plunger.