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:
May. 09, 2005
Hermes A. Fernandez, Pittsford, NY (US);
Andrew J. Lipinski, Henrietta, NY (US);
Nick J. Hendriksma, Grand Rapids, MI (US);
Thomas H. Fischer, Rochester, NY (US);
Timothy W. Kunz, Rochester, NY (US);
Hermes A. Fernandez, Pittsford, NY (US);
Andrew J. Lipinski, Henrietta, NY (US);
Nick J. Hendriksma, Grand Rapids, MI (US);
Thomas H. Fischer, Rochester, NY (US);
Timothy W. Kunz, Rochester, NY (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A two-step roller finger follower having a high-lift follower portion that rotates relative to a low-lift follower portion about a pivot shaft, including a lost-motion compression spring disposed in a linear bore formed in the high-lift portion to exert force against an curved pad on the back side of the valve pallet of the low-lift portion. The spring is retained and guided in its bore by a spring retainer having a planar bottom for engaging the curved pad. Preferably the retainer is a cup positioned in the spring bore such that the stroke of the cup is limited, to prevent leak-down of the associated hydraulic lash adjuster. Driving the spring by a linear-acting retainer in a linear bore causes the spring to be compressed linearly, resulting in a highly stable and predictable spring rate.