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A rubber endless track belt assembly for use in a crawler type track mechanism, which has a rubber endless track belt and a plurality of metal cores embedded at an equal spaced distance to one another in the belt along the longitudinal direction thereof. Each of the metal cores is provided with a pa

A rubber endless track belt assembly for use in a crawler type track mechanism, which has a rubber endless track belt and a plurality of metal cores embedded at an equal spaced distance to one another in the belt along the longitudinal direction thereof. Each of the metal cores is provided with a pair of intermediate guide lugs spaced apart from each other and projecting outwardly on the inner peripheral side of the belt, a pair of wing portions each projecting horizontally in the transverse direction of the belt and embedded therein, and a pair of flat surface zones to which bogie wheels are thrustedly and rotatingly contacted, each of which zones being formed between the guide lug and the wing portion so as to extend in the longitudinal direction of the belt over the width of the wing portion and to be exposed on the inner peripheral side of the belt.

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1. A rubber endless track belt assembly for use with a drive sprocket wheel assembly and an idler sprocket wheel assembly, said rubber endless track belt assembly comprising: a rubber endless track belt; a plurality of metal cores imbeddded to an equal distance to each other in said rubber endle

1. A rubber endless track belt assembly for use with a drive sprocket wheel assembly and an idler sprocket wheel assembly, said rubber endless track belt assembly comprising: a rubber endless track belt; a plurality of metal cores imbeddded to an equal distance to each other in said rubber endless track belt along the longitudinal direction of said rubber endless track belt; each of said metal cores having a single portion extending and exposed from said rubber endless belt, said single portion comprising a guide lug at the center of said portion, a pair of wing portions extending perpendicular to the longitudinal direction of said rubber endless track belt on opposite sides said guide lug, and a pair of flat surface zones between said guide lug and said pair of wing portions; wherein each of said pair of flat surface zones has extended portions, which extend perpendicularly beyond the wing portion along the longitudinal direction of said rubber endless track belt, and has a predetermined width adapted to receive thereon a bogie wheel of said rubber endless track belt assembly. 2. A rubber endless track belt assembly as set forth in claim 1 wherein each of the pair of flat surface zones is formed on a shoulder stepped portion of the guide lug so as to rise over the wing portion. 3. A rubber endless track belt assembly as set forth in claim 1, wherein each of the pair of flat surface zones is formed smoothly from the surface of said wing portion on the inner peripheral side of the rubber endless track belt so that the inner peripheral surface of said belt extends onto the wing portion of each metal core. 4. A rubber endless track belt assembly as set forth in claim 2, wherein the surface of said flat surface zone is exposed and has the same level as the inner peripheral surface of the rubber endless track belt. 5. A rubber endless track belt assembly as set forth in claim 1, further comprising a plurality of steel cords embedded in the rubber endless track belt inside the metal cores and extending in the longitudinal direction of said belt. 6. A rubber endless track belt assembly as set forth in claim 1, said rubber endless track belt is formed with a plurality of recessed grooves, each being formed therein at a portion positioned between respective shoulder stepped portions of the metal cores adjacent to each other and extending in the transverse direction of said belt. 7. A rubber endless track belt assembly as set forth in claim 1, wherein the extended portion at each of each flat surface zone extends for a predetermined length beyond the wing portion, said predetermined length of each extended portion being approximately one-fifth to three-fifths the width of the wing portion adjacent said flat surface zone. 8. A rubber endless track belt assembly as set forth in claim 1, further comprising a bogie wheel, wherein the predetermined width of each flat surface zone is substantially equal to the width of the bogie wheel. 9. A rubber endless track belt assembly as set forth in claim 5, wherein the plurality of steel cords are embedded underneath said wing portions and said flat surface zones of the metal cores.