Piston for an internal combustion engine

Abstract

The present invention relates to a piston ( 10 ) for an internal combustion engine, having an outer circumferential cooling channel ( 19 ) and an inner cooling cavity ( 21 ), the cooling cavity bottom ( 22 ) of which has an opening ( 23 ) that is closed off with a separate closure element ( 33 ) that has at least one cooling oil opening ( 35 ), whereby the closure element ( 33 ) is held, in clamped manner, by means of two engagement elements ( 37 ) disposed on the outer edge, in at least one engagement groove ( 34 ) provided in the region of the opening ( 23 ) of the cooling cavity bottom ( 22 ). According to the invention, it is provided that the closure element ( 33 ) has at least two spring tabs ( 38 ) that support themselves on a contact surface ( 39 ) provided in the piston interior, in each instance, in such a manner that the closure element ( 33 ) is held in the engagement groove ( 34 ) under axial bias.

1 . Piston ( 10 ) for an internal combustion engine, having an outer circumferential cooling channel ( 19 ) and an inner cooling cavity ( 21 ), the cooling cavity bottom ( 22 ) of which has an opening ( 23 ) that is closed off with a separate closure element ( 33 ) that has at least one cooling oil opening ( 35 ), whereby the closure element ( 33 ) is held, in clamped manner, by means of two engagement elements ( 37 ) disposed on the outer edge, in at least one engagement groove ( 34 ) provided in the region of the opening ( 23 ) of the cooling cavity bottom ( 22 ), wherein the closure element ( 33 ) has at least two spring tabs ( 38 ) that support themselves on a contact surface ( 39 ) provided in the piston interior, in each instance, in such a manner that the closure element ( 33 ) is held in the engagement groove ( 34 ) under axial bias. 
     
     
         2 . Piston according to  claim 1 , wherein the spring tabs ( 38 ) support themselves on a contact surface ( 39 ) provided in the region of the pin boss links ( 18 ), in each instance. 
     
     
         3 . Piston according to  claim 1 , wherein the at least one engagement groove ( 34 ) is provided in the region of the pin boss links ( 18 ). 
     
     
         4 . Piston according to  claim 1 , wherein the at least two engagement elements ( 37 ) and/or the at least two spring tabs ( 38 ) lie diametrically opposite one another. 
     
     
         5 . Piston according to  claim 1 , wherein the engagement elements ( 37 ) are configured as engagement tongues. 
     
     
         6 . Piston according to  claim 1 , wherein the closure element ( 33 ) has two or more cooling oil openings ( 35 ). 
     
     
         7 . Piston according to  claim 1 , wherein the at least one cooling oil opening ( 35 ) in the closure element ( 33 ) is configured as a slit that extends radially inward from the edge of the closure element ( 33 ). 
     
     
         8 . Piston according to  claim 1 , wherein the engagement elements ( 34 ) and/or the spring tabs ( 38 ) are delimited by slits that extend radially inward from the edge of the closure element ( 33 ). 
     
     
         9 . Piston according to  claim 1 , wherein a narrow gap ( 42 ) is provided in the region of the spring tabs ( 38 ), between the piston interior and the closure element ( 33 ). 
     
     
         10 . Piston according to  claim 1 , wherein the opening ( 23 ) in the cooling cavity bottom ( 22 ) and the closure element ( 33 ) are essentially configured to be round. 
     
     
         11 . Piston according to  claim 1 , wherein the opening ( 23 ) in the cooling cavity bottom ( 22 ) is configured to be oval or as an oblong hole, and the closure element ( 33 ) is configured corresponding to this. 
     
     
         12 . Piston according to  claim 1 , wherein the closure element ( 33 ) is produced from a spring steel sheet. 
     
     
         13 . Piston according to  claim 1 , wherein it is configured as a two-part piston having an upper piston part ( 11 ) and a lower piston part ( 12 ).