Switchable cam follower

US7299778B2 · kind B2 · utility

Assignee

• Schaeffler KG · DE

Inventor

• André Kuckuk · Herzogenaurach, DE

Key dates

• Filing date: May 2, 2006
• Grant date: Nov 27, 2007
• Expiry date: Jul 7, 2026

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L13/0031
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention proposes a switchable cam follower (1) for a valve train of an internal combustion engine, said cam follower comprising two elements (2, 3) telescoped into each other and, axially displaceable relative to each other. A bore (4) comprising at least one piston (5) extends in the inner element (2). The piston (5) has, on a portion of its outer peripheral surface (7), a stepped entraining surface (8) that starts from the first front end (6) of the piston (5) facing the outer element (3). For achieving coupling, the piston (5) can be displaced with this entraining surface (8) onto a flat counter surface (10) of the other element (3). The entraining surface (8) of the piston (5) extends, starting from the first front end (6), toward a second front end (11) of the piston (5) while tapering into a conical shape generally in the direction toward a longitudinal axis of the piston (5). Besides this, an edge region (12) of the entraining surface (8) on the first front end (6) is additionally provided with a cylindrical, outwards arched (with reference to a starting point of the radius (R)) contour (13) that extends orthogonally to the longitudinal axis of the piston (5). In this …