Core bar for rubber crawler and rubber crawler

A rubber crawler, comprising:

• a rubber crawler body;
• and
• a core bar including right and left wing parts;
• an engaging part for connecting the right and left wing parts;
• right and left protrusions formed on opposite sides of the engaging part to guide a rolling wheel;
• and right and left outside rails disposed on outer sides of the right and left protrusions with respect to a center of the core bar in the lengthwise direction thereof, respectively, each of the outside rails having an overhanging part extending in the widthwise direction of the wing part, the overhanging part being formed with an edge portion that extends from the wing part, the edge portion having an upper surface which slants substantially downward toward an end of the overhanging part from a top surface of the outside rail;
• wherein the core bar is embedded in the rubber crawler body with rail surfaces of the right and left outside rails exposed on an inner circumferential surface of the rubber crawler body so that the rail surfaces of the right and left outside rails form a rolling wheel track against which an outside collar of a rolling wheel is abutted, and
• wherein the rubber crawler body has rubber protrusions raised from the rail surface between the right and left outside rails adjacent to each other in the circumferential direction of the crawler.

A rubber crawler comprising:

• a rubber crawler body;
• core bars embedded in the rubber crawler body at intervals along the circumferential direction thereof;
• and
• right and left tension belts embedded in the rubber crawler body on an outer circumferential side of the core bars,
• wherein the core bar has an engaging part for drive formed in a middle portion of the core bar in the lengthwise direction thereof;
• right and left protrusions for guiding a rolling wheel protruding toward an inner circumferential surface of the rubber crawler body on both right and left sides of the engaging part;
• right and left outside rails formed on outer sides of the right and left protrusions, respectively, with respect to the middle portion of the core bar in the lengthwise direction thereof;
• and right and left wing parts formed on further outer sides of the right and left outside rails, respectively, and
• wherein each of the right and left outside rails has an overhanging part extending at least one of the front and the rear sides in the widthwise direction-of the wing part;
• a rail surface formed on the top surface of the outside rail and exposed on the inner circumferential surface of the rubber crawler body, on which the outside collar of the rolling wheel rolls;
• and a convexly curved transfer surface formed on an edge portion of the overhanging part extending from the wing part in such a manner as to slant substantially downward from the rail surface to an outer end of the overhanging part in the widthwise direction of the wing part for a smooth transfer of the outside collars of the rolling wheel to the next rail surface.