Patent ID: 7765838

Claim:
A washing machine, comprising: a tub including: a rear tub portion defining a cylindrically shaped body and a rear surface portion integrally formed with one end of the body, the rear surface portion having a motor shaft insertion hole in the center thereof; a front tub portion coupled to the other end of the body of the rear tub portion; one or more linear reinforcing portions formed on an outer circumference of the front tub portion; one or more linear reinforcing portions formed on an outer circumference of the body of the rear tub portion, wherein the one or more linear reinforcing portions extend from the other end of the body to a predetermined points of the rear surface of the body; one or more rear lattice reinforcing portions formed on the rear surface portion of the rear tub portion; one or more side lattice reinforcing portions provided on the body of the rear tub portion; and a motor directly coupled to the rear surface portion of the rear tub portion and having a driving shaft penetrating the motor shaft insertion hole, wherein the rear lattice reinforcing portions and the linear reinforcing portions of the rear tub portion are alternately formed around the outer surface of the rear tub portion.