Internal-combustion engines – Poppet valve operating mechanism – Tappet
Reexamination Certificate
2007-07-03
2007-07-03
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Tappet
C123S090490, C123S090520, C123S090530, C123S090200, C074S569000
Reexamination Certificate
active
11185501
ABSTRACT:
A hydraulic valve-lash-adjusting element (HVA) for the valve train of an internal combustion engine, wherein:a housing (1) has a blind bore (2) in which a piston (3) is guided with sealing clearance and is in pressure contact with a valve-actuating element (6) and its cam;the piston (3), together with the blind bore (2), defines a high-pressure space (4) while a low-pressure space (5) is located above the piston (3);the pressure spaces (4, 5) are connected by at least one central axial bore in the piston (3), this axial bore being controlled by a control valve arranged in the piston (3),wherein the control valve is designed as an exchange valve (11), with a valve body (12) which is guided in a smooth-running manner in the interior of the piston (3), serves to control an upper and a lower central axial bore (14, 15) and the closing movement in both directions of which is the relative movement of the piston (3) in relation to the valve body (12), which is virtually at a standstill because of its mass moment of inertia.
REFERENCES:
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Denion Thomas
Muserlian Charles A.
Riddle Kyle M.
Schaeffler KG
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