Loading patent…
AssigneesMahle International GmbH, Mahle Metal Leve S/A
InventorsPaulo Jose Da Rocha Mordente, Paulo R. Vieira De Morais, Jose V. Lima Sarabanda
Estimating the term…
A piston ring may include a metallic base, an outer slide layer and an intermediate layer disposed between the base and the outer slide layer. The base may extend between at least two end regions. The outer slide layer and the intermediate layer may be disposed on an outer radial face of each end region of the base.
A piston ring, comprising:
An internal combustion engine, comprising:
A piston ring for an internal combustion engine, comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Piston-rings , e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction: characterised by the use of particular materials
Characterised by the coating material: nitrides
Details: joint-closures
Rings with special cross-section ; Oil-scraping rings: oil-scraping rings
About 7 years 7 months of term left · ends 15 May 2034 (estimated)
This application claims priority to Brazilian Patent Application No. 1020130121339, filed May 15, 2013, and International Patent Application No. PCT/BR2014/000156, filed May 15, 2014, both of which are hereby incorporated by reference in their entirety.
The present invention relates to a piston ring for use on internal combustion engines, more particularly to a ring provided with a metallic base wherein the external portion of it ends receive two layers applied subsequently to provide greater resistance to wear.
As a general rule, every internal combustion engine, whether it operates in Diesel cycle or in Otto cycle, on 2 strokes or 4 strokes, comprises at least one piston with its respective rings.
The present invention will now be described in greater detail with reference to embodiments represented in the drawings. The figures show:
FIG. 1 is a prior-art piston ring;
FIG. 2 is a piston ring of the present invention;
The present invention proposes a piston ring 10 for internal combustion engine, more particularly a compression ring for heavy duty Diesel engines.
As it is known, such engines are quite demanding, which causes premature failure of their compression rings, due to the high wear in the rind-end regions. The present invention proposes a novel compression ring 10 that is capable of resisting wear in the end regions 4, without exposing the base material of the ring, thus maintaining high shapability at a reduced cost.
To this end, the ring 10 of the present invention makes use of a metallic base (of steel, cast iron or aluminum) provided with a chemical composition particularly developed for application of an intermediate layer 2, layer of wear-resistant material, preferably chrome nitride, but not limited to this material, this intermediate layer being applied by the thermal spray process, preferably by a high-velocity spray containing, as carburant, oxygen (HVOF), wherein an outer layer 3 is applied onto this intermediate layer 2 by physical vapor deposition (PVD), preferably of CrN, but not limited only to this material, alternatives of other nitrides, for example, Ti, W, or even carbides may be used as a final coating material of the contact surface of the rings. One may also use coatings with multi-layer concepts, either involving nanometric concepts or not.