FIELD: machine building.
SUBSTANCE: gear includes cylinder connected to drill column, piston arranged in it and hollow spindle connected to it. Spindle is equipped with hollow stock located in the cylinder and forming together with it and piston a closed chamber. Closed chamber is equipped with throttle and hydraulic channel with spring-loaded non-return valve, which is parallel to it. Outer diameter of stock differs from outer diameter of piston, and connection of spindle and housing is made in the form of splined self-releasing screw pair.
EFFECT: increasing efficiency and enlarging functional capabilities of the device.
3 cl, 6 dwg
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