Rubber crawler track and method of producing metal core for rubber track

A rubber crawler track to be driven by a driving device, the rubber crawler track comprising:

• a rubber crawler body shaped as an endless belt made of a rubber elastic body;
• a layer comprising a plurality of steel cords embedded in said rubber crawler body;
• and
• metal cores embedded in said rubber crawler body at a fixed interval in a crawler circumferential direction, each of said metal cores comprising
• an engaging portion formed at the center in a metal core length direction;
• guide protrusions for preventing wheel run-off;
• wing portions, said guide protrusions and said wing portions each being formed at opposite sides of the engaging portion;
• and
• horizontal protrusions formed on sides of the metal core in a width direction of the metal core at opposite sides of said engaging portion, said horizontal protrusions facing adjacent metal cores in the crawler circumferential direction and overlapping the horizontal protrusions of adjacent metal cores,
• wherein a distance “r” in the crawler circumferential direction between the ends of the horizontal protrusions and adjacent metal cores is expressed as Δr≦r≦2Δr when the rubber crawler track is horizontal, wherein Δr=2πh/n, wherein “h” is the distance from the layer of steel cords to portions of the horizontal protrusions that contact one another when the crawler track is wound around a sprocket, and “n” is the number of teeth of the sprocket for engaging the rubber crawler track.