Tappet for the valve gear of an internal combustion engine

US6223706A · kind A · utility

Assignee

• INA Wälzlager Schaeffler oHG · DE

Inventors

• Gerhard Maas · Herzogenaurach, DE
• Oliver Schnell · Weisendorf, DE

Key dates

• Filing date: Mar 24, 2000
• Grant date: May 1, 2001
• Expiry date: Mar 24, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L13/0036
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A tappet (1) is designed to be coupled for different lifts of at least one gas exchange valve. It comprises an outer annular section (2) which concentrically encloses a circular section (3). Both sections (2, 3) are axially movable relative to each other and are loaded in the region of their bottoms (4, 5) by cams of different lifts. Slides (8, 9, 13) extend in receptions (6a, 6b, 7) of the bottoms (4, 5). The first slide (8) cooperates with locking means (14) which scan a signal track on the opposing cam and, in a response to a lift of the signal track, block or permit a longitudinal movement of the first slide (8), the locking means yielding in their releasing direction under action of force. At the same time, the third slide (9) delimits on its radially outer end face (15), a pressure chamber for hydraulic medium. A displacement of all the slides (8, 9, 13) into their coupled position can be effected through this hydraulic medium. A particular advantage of the invention is that, on the one hand, the pressure chamber (16) for hydraulic medium is spatially separated from the locking means (14) so that no complicated sealing measures are required in the region of the locking means …