Direct-acting hydraulic tappet with reduced aeration

Details Direct-acting hydraulic tappet with reduced aeration Direct-acting hydraulic tappet with reduced aeration

1996-10-15

1997-10-07

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9049, 74569, F01L 125

Patent

active

056736622

ABSTRACT:
A direct-acting hydraulic tappet having a cup-like tappet body which includes a cylindrical projection extending inwardly from the base of the body and in which the hydraulic element of the tappet is received. A resiliently deformable diaphragm is received in the space formed between the peripheral wall of the tappet body and the cylindrical projection. The diaphragm defines two concentric outer and inner annular wells for allow oil entering the tappet body from an external source to overflow from the outer well into the inner well to provide a supply of deaerated oil to the low pressure inner chamber of the tappet. The diaphragm is fixed to the tappet body by being received in slots formed in the body and in the cylindrical projection, or by means of a press fit therein.

REFERENCES:
patent: 4397271 (1983-08-01), Gardner
patent: 4437439 (1984-03-01), Speil
patent: 5022361 (1991-06-01), Schut
patent: 5129374 (1992-07-01), Flavio
patent: 5586528 (1996-12-01), Speil

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