The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 2012
Filed:
Nov. 19, 2008
Mario Kuhl, Herzogenaurach, DE;
Lothar Von Schimonsky, Gerhardshofen, DE;
Norbert Nitz, Erlangen, DE;
Lucia Hinkovska, Herzogenaurach, DE;
Sandra Schäfer, Höchstadt, DE;
Mario Kuhl, Herzogenaurach, DE;
Lothar von Schimonsky, Gerhardshofen, DE;
Norbert Nitz, Erlangen, DE;
Lucia Hinkovska, Herzogenaurach, DE;
Sandra Schäfer, Höchstadt, DE;
Schaeffler KG, Herzogenaurach, DE;
Abstract
The invention proposes a switchable tappet () of a valve train of an internal combustion engine, said tappet comprising a hollow cylindrical housing () comprising a bottom (), an inner element () being guided for relative axial displacement in a bore () of the housing (), an at least indirect support for a gas exchange valve extending on a cam-distal front end () of the inner element (), two diametrically opposing pistons as coupling elements () being arranged in a radial bore () of the inner element (), which coupling elements (), for effecting coupling [full valve lift], can be displaced partly beyond a parting surface () between the housing () and the inner element () into an entraining surface () of the housing () by the force of a compression spring () clamped between inner front ends () of the coupling elements (), wherein the entraining surface () is an direct constituent of a separate annular member () that is fixed in a cam-distal region of the bore () of the housing (), wherein only one compression spring as a lost motion spring means () extends in a cylindrical hollow space () formed between an underside () of the bottom () of the housing () and a cam-side flat front end () of the inner element (), and wherein the inner element () is substantially disk-shaped and the parting surface () between the housing () and the inner element () does not comprise any vertical stop means.