TRANSMISSION GEAR FOR DRILLING RIGS, AND DRILLING MACHINES Russian patent published in 2016 - IPC E21B6/00 

FIELD: machine building.

SUBSTANCE: group of inventions relates to a transmission gear to drive a rig with a rotating tool. The device contains a drive spindle to rotate the tool, a toothed rim coaxially connected with the drive spindle, and an intermediate shaft to transmit the torque on the drive shaft from the driven shaft to the drive spindle. The intermediate shaft has a tooth wheel engaged with the coaxial toothed rim of the drive spindle. The transmission gear additionally contains a transmission shaft with a tooth wheel. The tooth wheel of the transmission shaft depending on the operation mode of the rig is put into engagement with the coaxial toothed rim of the drive spindle or is not put into engagement with the coaxial toothed rim of the drive spindle.

EFFECT: reduced overall dimensions of the device and its weight.

9 cl, 5 dwg