Piston for an internal combustion engine
First Claim
1. A piston for an internal combustion engine including a piston top having an annular cooling oil passage formed therein, a cooling oil supply passage extending at one side of said piston essentially parallel to the axis of said piston and being in communication with said annular cooling oil passage at one side of said piston and a cooling oil return passage extending at the opposite side of said piston essentially parallel to the axis of said piston and being in communication with said annular cooling passage at the opposite side of said piston, said cooling oil supply passage including cooling oil retaining pockets so shaped that they retain during outward movement of said piston part of the cooling oil supplied to said supply passage from a cooling oil supply nozzle directing oil into said oil supply passage and upon reversal of the outward movement of the piston, discharge the oil retained in said pockets toward said annular cooling oil passage formed in the piston top.
1 Assignment
0 Petitions
Accused Products
Abstract
In a piston for an internal combustion engine, which includes in its top an annular cooling oil passage which, at one side of the piston, is in communication with a cooling oil supply passage extending axially through the piston and has a bottom opening through which cooling oil is supplied by an injection nozzle, and, opposite the cooling oil supply passage, a cooling oil return passage in communication with the annular cooling oil passage for removing the cooling oil therefrom, at least the cooling oil supply passage includes cooling oil retaining pockets which retain, during outward movement of the piston, part of the cooling oil supplied to the cooling oil supply passage and from which the retained cooling oil is dislodged and moved to the annular cooling oil passage during inward movement of the piston.
9 Citations
6 Claims
- 1. A piston for an internal combustion engine including a piston top having an annular cooling oil passage formed therein, a cooling oil supply passage extending at one side of said piston essentially parallel to the axis of said piston and being in communication with said annular cooling oil passage at one side of said piston and a cooling oil return passage extending at the opposite side of said piston essentially parallel to the axis of said piston and being in communication with said annular cooling passage at the opposite side of said piston, said cooling oil supply passage including cooling oil retaining pockets so shaped that they retain during outward movement of said piston part of the cooling oil supplied to said supply passage from a cooling oil supply nozzle directing oil into said oil supply passage and upon reversal of the outward movement of the piston, discharge the oil retained in said pockets toward said annular cooling oil passage formed in the piston top.
Specification