Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Patent
1988-08-17
1989-09-05
Cross, E. Rollins
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
123188AF, 123 9016, F01L 902
Patent
active
048628441
ABSTRACT:
An especially adapted engine valve includes structure which damps motion of the valve during its final closure to seat. A spool portion of the valve establishes, with its associated guideway, a damping chamber into which oil under pressure may be admitted via a feed passageway. Oil is discharged through a flow-restricted bleed passageway during closure of the valve so as to create beneficial pressure buildup within the damping chamber and thus reduce the valve's closing velocity. Since the damping functions occur passively (i.e. dependent only upon the relative location of the valve within its guideway), gentle closing of the valve can occur at any point on the cam lobe thereby making it especially well suited for use in "lost motion" valve control systems. The valve is preferably sealed against oil leakage by a pair of axially spaced-apart seal members, and a drain port having an end located between the seal members at all times during the valve's displacements between its opened and seated positions.
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Shea Stephen F.
Wakeman Russell J.
Allied-Signal Inc.
Cross E. Rollins
Wells Russel C.
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