Rotor recess with scupper slots and free casting

Details Rotor recess with scupper slots and free casting Rotor recess with scupper slots and free casting

2005-11-29

2010-06-08

Leslie, Michael (Department: 3745)

Expansible chamber devices

Piston

With ported chamber in piston part for circulating heat...

Reexamination Certificate

active

07730828

ABSTRACT:
A piston for an internal combustion engine includes a piston head provided with an annular field, and a piston shaft arranged beneath the annular field. The piston shaft has shaft surfaces and a recess surface which is arranged around a bolt borehole and set back in relation to an outer diameter of the piston. At least one cavity is provided in the region of the lowest annular groove for oil flow in the direction of the recess surface during the movement of the piston and the at least one cavity is arranged outside an especially stressed region above the bolt borehole.

REFERENCES:
patent: 1675174 (1928-06-01), Hartog
patent: 3805677 (1974-04-01), Clary et al.
patent: 4428330 (1984-01-01), Shimizu
patent: 6973723 (2005-12-01), Cagney et al.
patent: 2002/0465931 (2002-04-01), Ribeiro
patent: A0529714 (1993-03-01), None
patent: 08121243 (1996-05-01), None
patent: 09112342 (1997-04-01), None
International Search Report dated Mar. 15, 2006.
Preliminary International Report on Patentability, International file No. PCT/EP2005/012708.
International Searching Authority, International file No. PCT/EP2005/012708.

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