东风4B型内燃机车齿轮箱主要是为牵引主、从动齿轮提供一个密闭的工作环境,并储存一定量的牵引齿轮润滑油脂,供牵引主、从动齿轮润滑、散热。由于东风4B型内燃机车牵引电机与轮对间采用的是抱轴式悬挂方式,机车牵引齿轮箱通过4条M30×90 mm螺栓单侧定位在牵引电机上,直接承受着 DF4B diesel locomotive gearbox is mainly for traction, driven gear to provide a closed working environment, and store a certain amount of traction gear lubricant for traction, driven gear lubrication, heat dissipation. As the DF4B diesel locomotive traction motor and the wheel is used between the axle suspension, locomotive traction gear box by 4 M30 × 90 mm bolts located on one side of the traction motor, directly bearing