| 摘要 |
Disclosed is a piston ( 1 ) for a combustion engine, comprising an annular grooved reinforcement ( 4 ) that is screwed onto an externally threaded ( 13 ) collar ( 12 ) located in the piston head area via an internal thread ( 19 ) which is mounted on the inside of the grooved reinforcement ( 4 ). The grooved reinforcement ( 4 ) blocks a recess ( 14 ) so as to form an annular, closed cooling duct ( 21 ). In order to provide the screwed connection between the collar ( 12 ) and the grooved reinforcement ( 4 ) with sufficient stability, a radially outward area of the collar ( 12 ) is equipped with a bend that points towards the hub. Furthermore, the collar ( 12 ) is embodied in an elastically resilient manner so as to bend in the direction of the piston head when the grooved reinforcement is screwed in, thus prestressing the screwed connection.
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