US2001025568A1PendingUtilityA1

One-piece piston

32
Assignee: MAHLE GMBHPriority: Mar 28, 2000Filed: Mar 23, 2001Published: Oct 4, 2001
Est. expiryMar 28, 2020(expired)· nominal 20-yr term from priority
Inventors:Peter KemnitzJochen Kortas
F02F 3/22F02F 2200/04F02F 3/003F02F 2003/0061F05C 2201/0448
32
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Claims

Abstract

A one-piece piston comprises a piston crown made of steel and a bottom component made of forged steel, and a cooling channel that is formed by welding the crown and the bottom component of the piston together. The cooling channel is located radially behind the annular grooves. The crown and the bottom component of the piston jointly form a central cooling chamber whose lower limiting wall is forged as one piece with the bottom component of the piston. The welding seams joining the crown and the bottom component of the piston are friction welding seams. The piston provides for superior cooling of the crown of the piston and simplifies the production of the welding seams.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A one-piece piston with annular grooves for receiving piston rings, comprising: 
 a piston crown made of steel;    a lower piston component made of forged steel;    a cooling channel for receiving cooling oil, said cooling channel being formed by two welding seams formed by friction welding, said seams joining the piston head and the lower piston component with each other and being arranged at least partially in a radial manner behind the annular grooves; and    a central cooling chamber for receiving cooling oil formed jointly by said piston crown and lower piston component, said central cooling chamber having a lower limiting wall that is forged so as to form one piece with the lower piston component.    
     
     
         2 . The one-piece piston according to    claim 1   , wherein overflow openings are provided between the cooling channel and the central cooling chamber.  
     
     
         3 . The one-piece piston according to    claim 2   , wherein at least one drain opening for the cooling oil is provided in the central cooling chamber.  
     
     
         4 . The one-piece piston according to    claim 1   , wherein the piston crown is made of a highly heat-resistant material.  
     
     
         5 . The one-piece piston according to    claim 4   , wherein the piston crown is made of valve-type steel.

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