Internal-combustion engines – Poppet valve operating mechanism – Tappet
Reexamination Certificate
2006-12-12
2006-12-12
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Tappet
C123S090460, C123S090550
Reexamination Certificate
active
07146954
ABSTRACT:
A reverse spring hydraulic valve-lash-adjusting element for the valve train of an internal combustion engine having a plunger (1), in the plunger head (2) of which a control valve (5) is arranged, this control valve (5) controlling a central axial bore (6) which connects a low-pressure space (4), arranged above the plunger head (2), to a high-pressure space (3) arranged below the plunger head (2), the control valve (5) having a valve-closing body (7) which is loaded in the opening direction by a valve-body spring (17) and as a result passes from a cylinder-ring-shaped sealing surface (8) arranged on the plunger head (2) to a travel-limit surface (9) of a center piece (24), whereas the closing of the control valve (5) is effected by displacement of oil from the high-pressure space (3) into the low-pressure space (4) wherein the valve-closing body (7) reaches the sealing surface (8) on a linear path without lateral movement or rotation of said valve-closing body (7) by virtue of the fact that a circular-cylindrical and axially parallel guide surface connected to the plunger head (2) is provided, this guide surface enclosing a corresponding guide line (40) of the valve-closing body (7) with guide clearance.
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Sailer Peter
Schnell Oliver
Denion Thomas
Eshete Zelalem
INA-Schaeffler KG
Muserlian Charles A.
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