Dual feed hydraulic lash adjuster with integrated de-aeration restriction
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United States of America Patent
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Apr 10, 2018
Grant Date -
Feb 15, 2018
app pub date -
Aug 10, 2016
filing date -
Aug 10, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A switching hydraulic fluid gallery de-aeration arrangement for a switchable valve arrangement is disclosed. A housing for a hydraulic lash adjuster assembly is positioned in a bore of a cylinder head. The housing includes a first, hydraulic lash adjuster fluid port in a first annular groove, and a second switching hydraulic fluid port in a second annular groove. A top land and a bottom land are positioned next to the annular grooves and each have a primary outer diameter. A middle land is defined axially between the grooves. The middle land has a reduced outer diameter relative to the primary outer diameter, or the bore has an annular groove between the top and bottom lands that defines a restricted flow path between a hydraulic lash adjuster fluid gallery and a switching hydraulic fluid gallery that maintains hydraulic fluid in the switching hydraulic fluid gallery.
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