Multipart cooled piston for an internal combustion engine
First Claim
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1. A multipart, cooled piston for an internal combustion engine, comprising:
- an upper part having a ring part and a ring wall;
a lower part, which jointly with the upper part forms an outer ring-shaped cooling channel and an inner ring-shaped cooling channel arranged concentrically with the outer cooling channel, said lower part comprising a box-shaped piston shaft with two bolt hubs connected therewith;
a threaded bolt arranged coaxially with a longitudinal axis of the piston and disposed on a side of the upper part facing the lower part, wherein the threaded bolt forms an inner limitation of the inner cooling channel; and
a threaded bore arranged coaxially with the longitudinal axis of the piston and disposed on an area of the lower part that covers the inner cooling channel and which faces the upper part, said area being thin-walled to such an extent that it can be deformed like a plate spring, and said threaded bore having a female thread fitting the thread of the threaded bolt, wherein the threaded bolt and the threaded bore are arranged so that the threaded bolt is screwed into the threaded bore for assembling the upper part and the lower part.
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Abstract
A multipart cooled piston for an internal combustion engine comprises an upper part and a lower part of the piston. The two parts are screwed together via a threaded bolt that is arranged on the upper part of the piston, and a threaded bore that is drilled into the lower part of the piston. The threaded bore is arranged in an area of the lower part of the piston that is thin-walled to such a degree that it is deformed like a plate spring as the two parts of the piston are screwed together, so that no other safety means such as a lock nut are required for securing the assembled piston.
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Citations
1 Claim
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1. A multipart, cooled piston for an internal combustion engine, comprising:
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an upper part having a ring part and a ring wall;
a lower part, which jointly with the upper part forms an outer ring-shaped cooling channel and an inner ring-shaped cooling channel arranged concentrically with the outer cooling channel, said lower part comprising a box-shaped piston shaft with two bolt hubs connected therewith;
a threaded bolt arranged coaxially with a longitudinal axis of the piston and disposed on a side of the upper part facing the lower part, wherein the threaded bolt forms an inner limitation of the inner cooling channel; and
a threaded bore arranged coaxially with the longitudinal axis of the piston and disposed on an area of the lower part that covers the inner cooling channel and which faces the upper part, said area being thin-walled to such an extent that it can be deformed like a plate spring, and said threaded bore having a female thread fitting the thread of the threaded bolt, wherein the threaded bolt and the threaded bore are arranged so that the threaded bolt is screwed into the threaded bore for assembling the upper part and the lower part.
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Specification
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Current AssigneeMahle GmbH (MAHLE-STIFTUNG GmbH)
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Original AssigneeMahle GmbH (MAHLE-STIFTUNG GmbH)
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InventorsScharp, Rainer, Messmer, Dieter
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Primary Examiner(s)MCMAHON, MARGUERITE J
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Application NumberUS10/382,431Time in Patent Office425 DaysField of Search123/193.6, 921/86, 922/20, 922/55, 922/56, 922/58, 922/16US Class Current123/193.6CPC Class CodesF02F 3/0023 the parts being bolted or s...F02F 3/22 the fluid being liquid
