Drum type washing machine

A drum type washing machine comprising:

• a housing forming an external appearance of the drum type washing machine;
• a spin tub rotatable with respect to a horizontal axis of the washing machine by receiving rotational force from a driving motor through a rotating shaft, the spin tub including a spin tub body having a cylindrical structure formed with a plurality of pores allowing water to pass through the spin tub, the spin tub body having a front section with a laundry receiving opening provided and a rear section opposite to the front section;
• a balancer installed at the rear section of the spin tub to reduce a dynamic imbalance during rotation thereof, the balancer including a single annular-shaped race having a closed internal space in which balancing material is accommodated, the single annular-shaped race including a first annular-shaped member and a second annular-shaped member joined to each other to define the closed internal space, the first annular-shaped member including a first side wall, a second side wall and a connecting wall between the first side wall and the second side wall, the first annular-shaped member having an open side opposite to the connecting wall, and the second annular-shaped member being adapted to cover the open side of the first annular-shaped member;
• a shaft flange including a hub section to fixedly install the rotating shaft and a plurality of arm sections extending radially outward from the hub section and mounted to the spin tub so as to uniformly transfer the rotational force to the spin tub;
• and
• a rear cover provided on the rear section of the spin tub,
• wherein the balancer is disposed adjacent to the rear cover and the shaft flange such that the first annular-shaped member contacts the shaft flange and the second annular-shaped member contacts the rear cover.