Rear drive axle's rear -axle housing assembly

The utility model relates to a rear drive axle's rear -axle housing assembly, including casing (1), last casing piece (2) and lower casing piece (3) that casing (1) is connected including mutually supporting, its characterized in that: upward be equipped with semicircular upward hole (4) on casing piece (2) be equipped with on casing piece (3) down under the semicircular hole (5), go up hole (4) and hole (5) corresponding cooperation down. The utility model discloses an advantage: the utility model provides an axle housing piece is in the design, has cancelled the technology engineerings such as boring, cutting groove, welding triangular plate of axle housing hole, reduces the welding seam of rear -axle housing, sparingly welds the material, has improved the whole quality of axle housing welding seam, has avoided the fracture of axle housing welding seam, oil spill risk, and the optimizing produte structure reduces part type, and the axle housing quality is being shown to be promoted, improves production effi