| US 7,458,352 B2 | ||
| Switchable valve drive element of an internal combustion engine | ||
| Peter Sailer, Erlangen (Germany); Oliver Schnell, Veitsbronn (Germany); and Jochen Tovar, Erlangen (Germany) | ||
| Assigned to INA Schaeffler KG, (Germany) | ||
| Filed on Jul. 21, 2005, as Appl. No. 11/186,331. | ||
| Claims priority of application No. 10 2004 038 446 (DE), filed on Aug. 07, 2004. | ||
| Prior Publication US 2006/0027193 A1, Feb. 09, 2006 | ||
| Int. Cl. F01L 1/14 (2006.01) | ||
| U.S. Cl. 123—90.55 [123/90.48; 123/90.5; 123/90.52; 123/90.57; 123/198 F] | 4 Claims |
| 1. A valve drive element for an internal combustion engine, comprising
a valve tappet which can be displaced axially in a bore of a machine housing, a camshaft with a respective rotatable cam thereon
for operating the tappet, wherein the valve drive element is a switchable valve drive element that is actuated hydraulically,
the valve tappet including an oil reservoir, a ball valve, a high-pressure space, at least one connecting element, an additional
internal space, and a roller which are arranged in a row extending in an axial direction;
a switching duct which adjoins the valve tappet and is for holding a hydraulic oil, and
a connection through the valve tappet between the switching duct and the additional internal space having a lower pressure
level as compared to a pressure level in the switching duct, the connection comprising a longitudinal groove arranged on a
lateral surface of the valve tappet and connected to the additional internal space of the valve tappet; and
a scavenging duct for connecting the longitudinal groove to the additional internal space of the valve tappet, the additional
internal space located between the connecting element and the roller.
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