| 摘要 |
A drilling machine including a rock drill comprising a striking piston fitted to reciprocate in a cylinder. The piston is driven by a pressure medium. A rotation motor is provided and is driven by a pressure medium. A pump piston is permanently connected to a striking piston in concentric relation and arranged to travel in a pump cylinder. The cylinder is concentric with the cylinder that operates the striking piston and is axially spaced therefrom. The pump piston is arranged to provide a pump pressure medium to the rotation motor.
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