Piston for an internal combustion engine
AssigneeMahle International GmbH
InventorsPhilipp Licht, Rainer Scharp
Life of this patent
Estimating the term…
Abstract
A piston for an internal combustion engine may include at least one oil ring groove configured to receive an oil scraper ring. The at least one oil ring groove may have an upper groove flank, a lower groove flank, and a groove base. The at least one oil ring groove may be structured to be asymmetrical and deeper in a radial direction in a region of the lower groove flank. The piston may also include an oil outflow channel structured and arranged to fluidically communicate with an oil collecting chamber disposed in a spine of the oil scraper ring. A connecting point between at least one of (i) the at least one oil ring groove and the oil outflow channel, and (ii) the oil collecting chamber and the oil outflow channel may be disposed exclusively in the lower groove flank.
Claims19
A piston for an internal combustion engine, comprising:
- at least one oil ring groove configured to receive an oil scraper ring, the at least one oil ring groove having an upper groove flank facing toward a piston crown, a lower groove flank averted from the piston crown, and a groove base;
- the at least one oil ring groove structured to be asymmetrical and deeper in a radial direction in a region of the lower groove flank;
- an oil outflow channel structured and arranged to fluidically communicate with an oil collecting chamber disposed in a spine of the oil scraper ring;
- wherein a connecting point between at least one of (i) the at least one oil ring groove and the oil outflow channel, and (ii) the oil collecting chamber and the oil outflow channel is disposed exclusively in the lower groove flank and spaced apart from a corner of the at least one oil ring groove that connects the lower groove flank and the groove base;
- the upper groove flank and the lower groove flank each include a finish-machined surface disposed only in a region which comes into contact with the oil scraper ring when the oil scraper ring is received in the at least one oil ring groove;
- and
- the upper groove flank, the lower groove flank, and the groove base each have a pre-machined surface in a region of the oil collecting chamber.
A method for producing a piston, comprising:
- drilling an oil outflow channel into a body of the piston;
- forming an asymmetrical oil ring groove in the body of the piston, the oil ring groove configured to receive an oil scraper ring, the oil ring groove having a groove base, an upper grove flank and a lower groove flank, the upper groove flank facing toward a piston crown, the lower groove flank averted from the piston crown, the oil ring groove configured to be deeper in a radial direction in a region of the lower groove flank;
- providing, exclusively in the lower groove flank, a communicating connecting point between at least one of (i) the oil ring groove and the oil outflow channel, and (ii) the oil outflow channel and an oil collecting chamber disposed in a spine of the oil scraper ring;
- deburring the connecting point via a chip-removing tool and a grinding tool;
- and
- wherein the oil outflow channel is structured and arranged to fluidically communicate with the oil collecting chamber of the oil scraper ring.
A piston for an internal combustion engine, comprising:
- a piston crown;
- an upper groove flank;
- a lower groove flank disposed further from the piston crown than the upper groove flank;
- a groove base extending between and connecting the upper groove flank and the lower groove flank;
- a circumferentially extending oil ring groove defined by the upper groove flank, the lower groove flank, and the groove base, the oil ring groove opening in a radially outward direction;
- the oil ring groove having a greater radial depth in a region of the lower groove flank than in a region of the upper groove flank such that the oil ring groove is asymmetrical;
- an oil outflow channel structured and arranged to fluidically communicate with an oil collecting chamber disposed in a spine of an oil scraper ring arrangeable within the oil ring groove;
- wherein a connecting point between the oil ring groove and the oil outflow channel is disposed exclusively in the lower groove flank;
- wherein the upper groove flank and the lower groove flank each include a finish-machined surface disposed only in a region which comes into contact with the oil scraper ring when the oil scraper ring is received in the oil ring groove;
- and
- wherein the upper groove flank, the lower groove flank, and the groove base each have a pre-machined surface in a region of the oil collecting chamber when the oil scraper ring is received in the oil ring groove.
Dependencies are inferred from the claim text.