Mahle International Gmbh

Mahle Metal Leve S/a

Rodrigo Favaron

Robert Richard Banfield

Vinicius Bossoni Do Amaral

Gisela A Marques

A valve device for an internal combustion engine may include a valve and a metallic tungsten matrix coating containing at least one tungsten nanocarbide disposed on at least a portion of the valve via a chemical vapor deposition (CVD) process. The coating may include a thickness ranging from 5 &#x3bc;m to 150 &#x3bc;m and a hardness between 500 HV and 2000 HV.

Valve for internal combustion engines

A sliding element for an internal combustion engine may include a ferrous material base defining a plurality of surfaces. A binding nickel layer may be applied across all of the surfaces of the base. A deposited layer may be disposed on the binding layer. The deposited layer may include a metallic tungsten matrix and a tungsten carbide. The deposited layer may be provided with a thickness between 5 and 150 microns.

Sliding element and internal combustion engine

A three-piece oil ring for an internal combustion engine may include an expanding element defining at least a first side and a second side opposite the first side. A first upper annular segment may be associated with the first side of the expanding element. A second lower annular segment may be associated with the second side of the expanding element. The first annular segment and the second annular segment may each include a first internal side surface and a second external side surface. A metallic tungsten matrix coating may be disposed on at least one of the expanding element, the first annular segment and the second annular segment via chemical vapor deposition. The coating may contain a tungsten nanocarbide that may include at least one of WC, W2C, W3C and W12C. The coating may include a thickness between 5 &#x3bc;m and 150 &#x3bc;m and a hardness between 1000HV and 3500HV.

Three-piece oil ring for internal combustion engines, expanding element, and annular element

A piston ring for at least one of a piston of an internal combustion engine and a compressor may include at least one substantially annular metallic base having a nitrided layer. The base may include at least one chamfer and at least one outer surface that maintains contact with a layer of lubricating oil. The nitrided layer may exhibit a substantially constant thickness over at least one surface of the base and the at least one chamfer. The nitrided layer may include a nitrided diffusion layer that maintains direct contact with the layer of lubricating oil and has a residual tension ranging from +100 megapascal to &#x2212;100 megapascal.

Piston ring

The present invention refers to a piston ring, particularly for use in the piston channel of an internal combustion engine or a compressor, comprising at least a substantially ring-shaped metallic base () having at least a first region (), at least a second region () and at least a gap (), the first region () being positioned in a way substantially opposite to the gap (), the ring comprising at least a nitrided layer () in the second region () and comprising at least reduction of the nitrided layer () in the first region (), whereas the reduced nitrided layer () is at least partially blocked in the first region () due to the previous application of an intermediate layer ().

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Sao Paulo, Brazil

Rodrigo Favaron