Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent
1985-12-24
1987-03-10
Lazarus, Ira S.
Internal-combustion engines
Poppet valve operating mechanism
Tappet
F01L 124
Patent
active
046483608
ABSTRACT:
In a hydraulic valve tappet arranged in a bore of a cylindrical guide bore f a cylinder head of an internal combustion engine comprising a cup shaped housing (1) comprising a hollow outer wall (2) closed at one end by an end member (3) and a cylindrical sleeve 4 bearing against it in its bore, the cylindrical sleeve changing into an annular element (5) near end member (3), the annular element (5) carrying in its bore a guide sleeve (6) running coaxially with the outer wall (2), an oil duct (7) formed in the longitudinal direction at a peripheral location between outer wall (2) and cylindrical sleeve (4) starting from an oil feed bore (8) in outer wall (2) and terminating in an annular outer oil reservoir (10) at the junction between cylindrical sleeve (4) and the annular element (5), the outer oil reservoir (10) being defined by end member (3) of housing (1), annular element (5) and a hydraulic compensating element (11) comprised of outer cylindrical element (12) longitudinally moveable in guide sleeve (4) and closed at its end away from end member (3) of housing (1) and provided in its bore with a piston element (13) longitudinally moveable with little play, the piston element (13) comprising a hollow cylindrical casing (14) provided with a partition (15) between its ends having a through bore (16) closed by a check valve (17) and one end thereof bears against the inner surface of end member (3) to define a central oil reservoir (18) extending in front of check valve (17) and its other end together with cylindrical element (12) defines a high pressure oil chamber (19) closed by check valve (17) and with a recess (20) serving as oil transfer opening provided at a peripheral location of the contact area of piston element (13) and end member (3) on the inner surface of member (3) overlapping the contact area, the improvement comprising that the opening (9) of oil duct (7) into the annular outer oil reservoir (10) and recess (20) on the inner surface of end member (3) are diametrically opposite each other.
REFERENCES:
patent: 4437439 (1984-03-01), Speil
patent: 4465038 (1984-08-01), Speil
patent: 4470381 (1984-09-01), Buente et al.
Lazarus Ira S.
Motomak Motorenbau, Maschinen-und Werkzeugfabrik Konstruktionen
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