Internal-combustion engines – Particular piston and enclosing cylinder construction – Piston
Patent
1997-07-03
1998-07-14
Okonsky, David A.
Internal-combustion engines
Particular piston and enclosing cylinder construction
Piston
F16J 114
Patent
active
057788464
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a forged or cast piston head of a oscillating shaft piston for internal combustion engines,
The piston has a bottom and a ring section which has the piston ring grooves, and the piston bottom forms a radially outward transition into the ring section. The supports bearing the bosses of the piston head are connected in one piece with the underside of the piston bottom and are attached at a distance from the inside of the ring section. A piston bolt supporting the piston shaft can be seated in the bolt eye bore.
2. Prior Art
In such a piston which, for example, is described in the company Kolbenschmidt AG, Neckarsulm 1985, p. 60, the guidance and sealing functions are separate from each other. The piston head, which includes the piston bottom, the ring section, the bosses and their supports, is connected with the piston shaft by means of the piston bolt. Because of this design the piston shaft is better shielded from the hot piston bottom and ring section and can therefore be installed with less play than with a one-piece piston, which has advantageous effects on quiet running. The lateral forces caused by the crankshaft have furthermore less effect on the piston head because of the hinged connection. The latter is self-guiding in the cylinder and can be installed in an operationally dependable manner with less play than is possible with a one-piece piston. Sealing towards the combustion chamber is thereby improved as is the amount of blow-through, and carbonization of the ring groove and groove wear are reduced.
With the piston head, which as a rule is made of steel or cast iron and is produced by forging or casting, the shaping of the channel extending behind the ring field becomes extremely difficult because of the size of the bosses.
A piston is known from EP-A-019323, wherein the upper part of the piston and the lower part of the piston rest on each other via ring collar-like supports and are welded to each other in the area of the divided ring field.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a piston head of the shape described above for an oscillating shaft piston in such a way that improved shaping and improved workability is possible, in particular in the area of the channel revolving behind the ring section.
The noted object is achieved by the provision of a piston head wherein the piston bottom makes a radially outward transition into the ring section, and wherein the supports bearing the bosses and connected with the underside of the piston bottom are attached at a distance from the inside of the ring section and can be seated in the bolt eye bores of the piston bolts supporting the piston shaft, and such that the lower part of the ring section is connected with the upper part of the ring section by means of welding, soldering, frictional or an interlocking connection.
The compound production of the piston head from several differently finished unmachined pieces, the simultaneous application of several joining processes for connecting the unmachines pieces and the combination of several materials lead to an optimal piston component.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross section through a piston head according to one embodiment of the present invention;
FIG. 2 is a cross section through a piston head according to another embodiment of the present invention;
FIG. 3 is a lateral elevation view of a piston head according to one embodiment of the present invention;
FIG. 4 is a lateral elevation view of a piston head according to another embodiment of the present invention;
FIG. 5 is a lateral elevation view of a piston head according to one embodiment of the present invention;
FIG. 6 is a lateral elevation view of a piston head according to another embodiment of the present invention;
FIG. 7 is a cross section through a piston head according to another embodiment of the present invention;
FIG. 8 is a lateral elevation view of a piston head according to a variant of tha
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Kolbenschmidt Aktiengesellschaft
Okonsky David A.
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