Novel cast iron trundle and trundle bearing thereof

The utility model discloses a novel cast iron caster which comprises a wheel and a support leg, the wheel comprises a polyurethane layer, a cast iron wheel core and a bearing, the polyurethane layer wraps the cast iron wheel core, the bearing is arranged in the center of the cast iron wheel core, an inner ring of the bearing is provided with a lengthened sleeve, and the lengthened sleeve is sleeved on the support leg. The lengthened sleeve and an inner ring of the bearing are integrally formed, the lengthened sleeve comprises a first end part and a second end part, and the first end part and the second end part extend out of the two sides of the bearing; and the wheels are rotationally connected with the bracket legs. Based on the same inventive concept, the utility model further provides a trundle bearing. According to the novel cast iron trundle, an inner iron sheet in the prior art is omitted, the lengthened sleeve and the inner ring of the bearing are integrally formed, potential quality safety hazards of