| 摘要 |
The invention proposes a liquid-cooled assembled piston (1) having an upper part (2) and a lower part (3), wherein the upper part (2) and the lower part (3) are connected to one another by means of a radially outer annular support (12) and by means of a radially inner annular support (11). An outer cooling duct (13) is arranged between the outer support (12) and the inner support (11), and an inner cooling duct (18) is arranged radially within the inner support (11). Here, the outer cooling duct (13) is connected to the inner cooling duct (18) by means of at least one overflow duct (22, 22'). According to the invention, in order to reduce the compression height and therefore the axial dimensions of the piston, and in order to ensure an unimpeded discharge of cooling oil situated in the inner cooling duct (18) with little design expenditure, a bolt (20) with an outer thread (23) is arranged coaxially with respect to the piston axis (17) on the underside, which faces away from the piston head, of the piston head (4); the upper part (2) and the lower part (3) of the piston (1) are screwed to one another by means of a hexagonal nut (19) which can be screwed onto the outer thread (23) of the bolt (20); and the hexagonal nut (19) has, at the piston head side, a collar (25) with at least one radially arranged bore or milled portion (26, 27) which connects the inner cooling duct (18) to the piston interior space (28).
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