Gear case

The utility model provides a gear case belongs to box equipment field, including the box, be equipped with the oil tank in this box, still be equipped with transmission shaft and drive gear in the box, this drive gear is located in the oil tank, the oil tank is including locating the bottom plate bottom it, and this bottom plate is located drive gear's below, is equipped with the oilhole that runs through this bottom plate on the bottom plate, oilhole top -down includes communicating first trompil and second trompil, the diameter of first trompil is greater than the diameter of second trompil. This kind of gear case can clear up away the residue in the oil tank fast, makes it can not pollute and washs oil, makes drive gear normally work, its structural design is reasonable, and convenient to use can improve work efficiency.