Method for manufacturing a sliding tappet
AssigneeMahle International GmbH
InventorsChristoph Beerens, Gerhard Bucher, Justus Himstedt, Kurt Maier, Harald R. Mueller, Reinhard Rose, Christoph Steinmetz
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Abstract
A method for manufacturing a sliding tappet of a valve train of an internal combustion engine may include the steps of: providing a main body; applying a coating at least on a contact surface of the main body configured for contacting an associated cam. The coating may include tungsten carbide and cobalt, and the coating may be applied via high velocity oxygen fuel spraying. The method may further include the step of performing a surface finishing on the coating after the coating is applied.
Claims16
A method for manufacturing a sliding tappet of a valve train for an internal combustion engine, comprising:
- providing a main body;
- applying a coating at least on a contact surface of the main body configured for contacting an associated cam, the coating including tungsten carbide and cobalt;
- wherein applying the coating includes a high velocity oxygen fuel spraying technique;
- and
- performing a surface finishing on the coating after applying the coating at least on the contact surface, and wherein performing the surface finishing includes lapping the coating with a lapping compound having grains of a homogeneous grain size.
A sliding tappet of a valve train for an internal combustion engine, comprising:
- a main body defining a contact surface configured to contact an associated cam;
- a coating of a high velocity oxygen fuel sprayed material disposed at least on the contact surface of the main body, wherein the coating is composed of 80-90% by weight of tungsten carbide and 10-20% by weight of cobalt;
- and
- wherein the coating defines a thickness of 150 μm or less and has a surface roughness Rz of 2.0 μm or less.
An internal combustion engine, comprising:
- a sliding tappet and a camshaft in sliding contact with the sliding tappet via a cam, the sliding tappet including a contact surface contacting the cam;
- a coating disposed on the contact surface, wherein the coating is a high velocity oxygen fuel sprayed material and composed of 80-90% by weight of tungsten carbide and 10-20% by weight of cobalt;
- and
- wherein the coating has a thickness of 150 μm or less and a surface roughness Rz of 2.0 μm or less.
Dependencies are inferred from the claim text.