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US 5,349,748 AGranted
Method of manufacturing a tappet for an internal combustion engine
AssigneeFuji Oozx Inc.
InventorNobuo Hara
Life of this patent
Estimating the term…
Abstract
A method of manufacturing a tappet used in a valve operating mechanism of a direct acting type in an internal combustion engine. A tip engaged with a center bore of an inner upper surface of a tappet body includes upper and lower convex surfaces and a rounded upper circumferential corner having a certain curvature. thereby preventing concentration of stress even if the tip is subject to high compression load. Thus, durability and reliablity of the tappet are increased.
Claims3
A method of manufacturing a tappet for use in an internal combustion engine comprising the steps of:
- providing a plastically deformable, cup-shaped cylindrical tappet body closed at an upper end and having an inner upper surface;
- forming an engage bore having a flat upper surface at the center of the inner upper surface of the cylindrical tappet body;
- inserting a tip having upper and lower convex surfaces and a rounded upper circumferential corner having a certain curvature within the engage bore;
- and
- imposing force upon the lower convex surface of the tip plastically deforming the inner upper surface of the engage bore forming a concave surface in the inner upper surface of the engage bore corresponding to the upper convex surface of the tip.
2 more elements
A method of manufacturing a tappet comprising the steps of:
- forming an engage bore having a flat upper surface at a center of an inner upper surface of a plastically deformable cylindrical tappet body which is closed at an upper end;
- inserting a tip having upper and lower convex surfaces and a rounded upper circumferential corner having a certain curvature into the engage bore;
- pressing the tip strongly until the inner upper surface of the engage bore is plastically deformed to form a concave surface corresponding to the upper surface of the tip and to caulk a downward circumferential projection around the engage bore inwardly.
Dependencies are inferred from the claim text.