Internal-combustion engines – Poppet valve operating mechanism – Tappet
Reexamination Certificate
2008-06-20
2009-08-04
Moulis, Thomas N (Department: 3747)
Internal-combustion engines
Poppet valve operating mechanism
Tappet
C074S569000
Reexamination Certificate
active
07568461
ABSTRACT:
Improved end shapes are provided for laterally confined tappet rollers in high pressure fuel pumps and similar applications for improving lubrication and wear performance when rotating against a cylindrical surface. The roller ends are provided with annular end faces having diameters smaller than the roller diameter but spaced around the roller axis. Rotation of a roller end against a cylindrical surface provides two contact areas on opposite sides of a central plane through the axes of the roller and the cylindrical surface. The arrangements separate the surfaces between engagements with the contact areas and permit lubricant to reach the end face surfaces between contacts with the two areas. The improved tappet roller should improve service life for the fuel pumps and engine fuel systems in which they are employed.
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GM Global Technology Operations Inc.
Moulis Thomas N
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