Patent ID: 7478615

Claim:
Axial fixation arrangement for a spring support part of a switchable tappet for direct transmission of a cam stroke to a tappet push-rod of a valve drive of an internal combustion engine, comprising the tappet including an inner part, which receives a force of a spring means, the spring support part acts as a support for the spring means and is fixed axially at least in a direction of force of the spring means to the inner part, the spring support part and the inner part enclose in a region of the axial fixation a common annular channel defined by formed parts thereof which are aligned with each other, in which a retaining ring is arranged for positive-fit connection of the spring support part with the inner part, the retaining ring is formed from an essentially straight wire, inserted essentially tangentially into the annular channel through an opening located in the inner part, which has a hollow cylindrical shape in a region of the axial fixation with an inner sleeve surface enclosing the spring support part, the spring support part is comprised of thin-walled lightweight material, and is expanded conically in common with the spring means in a direction of the tappet push-rod, wherein an end surface of the spring support part facing the inner part forms an axial stop for a longitudinally movable piston top part supported in the inner sleeve surface of the inner part.