Big footpath auto -feed boring unit head of high rigidity

The utility model provides a big footpath auto -feed boring unit head of high rigidity, includes the box, the box tip is equipped with the main shaft, be equipped with a tapered roller bearing, the 2nd tapered roller bearing, spacer between box and the main shaft, a tapered roller bearing and the 2nd tapered roller bearing still are equipped with holding ring, first flanged type bearing end plate about the spacer symmetry on the bearing, and the box inboard is located to the holding ring, and first flanged type bearing end plate locates the box outside. An object of the utility model is to provide a big footpath auto -feed boring unit head of high rigidity chooses for use suitable main shaft bearing to replace the double -row tapered roller bearing who is not inconsistent the requirement to form a complete set and use suitable sub -assembly, improved the running accuracy of main shaft, prolonged the life of main shaft. To sum up, the utility model discloses following beneficial effect has: main shaft bearing