Hydraulic valve tappet

Internal-combustion engines – Poppet valve operating mechanism – Tappet

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F01L 124

Patent

active

047458895

ABSTRACT:
A self-adjusting hydraulic valve tappet arranged in a guide bore of a cyler head of an internal combustion engine and contacted at one end face by a control cam and abutting with a second end face against the end of a valve stem, the tappet consisting of a cup-shaped housing (1) comprising a hollow cylindrical wall (2) closed at one end by an end member (3) against the outside of which the cam abuts, and a cylindrical guide sleeve (6,28) concentric with the cylindrical wall (2), characterized in that the guide sleeve has at a point distant from the end member (3) an intake port (26,31,53) that opens into a duct extending to the end member (3), which is defined, on the one hand, by the outer surface of the outer piston (16) and, on the other hand, by the bore of the guide sleeve (6), and an oil transfer port (19,34) leading into the centric oil reservoir (18) is provided at the end of the inner piston (17) facing the end member (3).

REFERENCES:
patent: 4465038 (1984-08-01), Speil

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