Switchable support element for a valve train of an internal...

Details Switchable support element for a valve train of an internal... Switchable support element for a valve train of an internal...

2008-02-19

2011-12-27

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090520, C123S090550, C074S569000

Reexamination Certificate

active

08082896

ABSTRACT:
A switchable support element for a valve train of an internal combustion engine, comprising a housing that can be arranged with an outer peripheral wall in a reception of the internal combustion engine, an axially displaceable pressure piston extending in a bore of the housing, said pressure piston being loaded by a lost motion spring means in a direction leading out of the housing, a head of the pressure piston extending beyond an edge of the housing, and at least one coupling piston extending in a cross-bore of the pressure piston, which can be brought partially into engagement with an entraining surface of the housing for achieving coupling, wherein, starting from an outer front end of the at least one coupling piston, a flattened portion is arranged on an underside of the coupling piston wherein a flattened portion is arranged on an underside of the coupling piston, the entraining surface in the housing per coupling piston is constituted by an underside of a window-like aperture in the bore of the housing, on which underside the at least one coupling piston can be displaced with said flattened portion for achieving coupling, and the pressure piston comprises an anti-rotation device relative to the housing, while the at least one coupling piston comprises an anti-rotation device relative to the cross-bore.

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