| 摘要 |
In a diesel pile hammer, the circumferential surfaces of a piston and striker extend axially to such an extent that, when the piston and striker bear on one another, they are separated only by a very small distance. In their near-edge sections, the piston end face and striker end face are each provided with an annular trough having a semicircular cross section. In this way, when the piston has traveled fully against the striker, a basic working space is obtained, having the form of an annular space with a circular cross-section, in which combustion commences.
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