The utility model relates to the field of gear boxes, and discloses a
noise reduction type gear box which comprises a lower box body, the lower box body is detachably arranged below an upper box body, an installation groove is formed in the top face of the lower box body, an installation frame is fixed to the bottom face of the upper box body, the installation groove and the installation frame are arranged in a sliding mode, and the lower box body and the installation frame are arranged in a sliding mode. An elastic frame is fixed in the mounting groove, a flexible frame is fixed on the top surface of the lower box body, and sound insulation
layers are fixed in the lower box body and the upper box body. According to the utility model, the elastic frame is fixedly arranged in the mounting groove, so that the mounting frame can be extruded on the elastic frame, in addition, when the lower box body and the upper box body are spliced together, the lower box body and the upper box body can respectively extrude the flexible frame upwards and downwards, so that when the lower box body and the upper box body
shake up and down under the action of external force, the lower box body and the upper box body can
shake up and down. The lower box body and the upper box body can
impact on the flexible frame, and the mounting frame can also
impact on the elastic frame, so that the
noise generated when the lower box body and the upper box body
shake up and down is reduced.