Sidewall contact transmission device

The utility model relates to underground exploration technology fields, concretely is an pushing force transmission device. The objective is to overcome the defects of present technology and to provide a novel pushing force device transmission device with a simple structure, large transmission force, no stuck risk and prolonged service life of whole device. The technical solution is as follow: the utility model includes an active block and a force block, which is characterized in that: the inner active and force blocks are respectively embedded with an active transmission force plate and a force transmission plate whose surfaces are on the same plane with the active and force blocks, the inner force transmission plate is provided with a dovetail groove, the inner dovetail groove is installed with a needle roller row whose surface is little higher than the surface of the force transmission plate, a press spring is arranged between one end of the needle roller row and the end of the dovetail groove, the press spring is installed on the end of the dovetail groove disposed on the upper end of the force transmission plate.