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:
Dec. 11, 2007
Filed:
Jan. 05, 2005
Soren Udd, Nodinge, SE;
Soren Udd, Nodinge, SE;
Volvo Lastvagnar AB, Gothenburg, SE;
Abstract
Apparatus and method for controlling valve movements in an internal combustion engine that has at least one inlet valve () and at least one exhaust valve for controlling the connection between the combustion chamber in the cylinder and an inlet system and an exhaust system respectively. A rotatable camshaft is provided that has a cam curve including a rising ramp () and a falling ramp () that is designed to interact with a valve mechanism () for actuation of the inlet or exhaust valve () under the action of a valve spring (). The valve mechanism () includes control members (and) that allow return movement of the valve mechanism to be controlled during the closing phase of the inlet valve () or the exhaust valve, independently of the falling ramp () of the cam curve. The control members (and) are arranged so that the closing of the valve can be delayed for an adjustable period of time by means of a hydraulically adjustable force counteracting the closing force of the valve spring.