Rubber crawler
A rubber crawler includes parallel embedded tensile strength bodies, with each of tensile strength bodies being connected by butt portions. The butt portions of adjacent tensile strength bodies are longitudinally shifted relative to one another in a circumferential direction of the rubber crawler, and at least 75% of the butt portions are positioned on planes of projection of the core bars.
1. A rubber crawler, comprising:
a rubber elastic body having lugs, said lugs being embedded in an outer peripheral side of the rubber elastic body and positioned at intervals along a circumferential direction of the rubber crawler;
metallic core bars embedded in the rubber elastic body at intervals along the circumferential direction of the rubber crawler; and
a plurality of parallel tensile strength bodies embedded in the outer peripheral side of the rubber elastic body, peripherally outside the core bars, said tensile strength bodies extending in the circumferential direction of the rubber crawler and forming one or more rows of tensile strength bodies in a width direction of the rubber crawler, each of said tensile strength bodies having a butt portion, each of said one or more rows of tensile strength bodies being endless as a whole by shifting the butt portions of at least 80% of the tensile strength bodies forming each row longitudinally with respect to the butt portions of adjoining tensile strength bodies, and the butt portions of more than 75% of the tensile strength bodies being positioned within a projection of the core bars in a direction perpendicular to the plane of the core bars.
2. A rubber crawler as claimed in claim 1 , wherein the plurality of tensile strength bodies is divided, in a width direction of the rubber crawler, into three rows of tensile strength bodies.
3. A rubber crawler as claimed in claim 1 , wherein each of the butt portions of the tensile strength bodies forming each row is shifted longitudinally with respect to the butt portions of adjoining tensile strength bodies.
4. A rubber crawler as claimed in claim 1 , wherein less than 40% of the tensile strength bodies forming each row have butt portions positioned within a fixed interval between adjacent core bars in the circumferential direction of the rubber crawler.
5. A rubber crawler as claimed in claim 1 , wherein the butt portions of the tensile strength bodies forming each row are positioned within planes of projection of the core bars or within planes of projection of the lugs.
6. A rubber crawler, comprising:
a rubber elastic body having lugs, said lugs being embedded in an outer peripheral side of the rubber elastic body and positioned at intervals along a circumferential direction of the rubber crawler;
metallic core bars embedded in the rubber elastic body at intervals along the circumferential direction of the rubber crawler; and
a plurality of parallel tensile strength bodies embedded in the outer peripheral side of the rubber elastic body, peripherally outside the core bars, said tensile strength bodies extending in the circumferential direction of the rubber crawler and being divided into two rows of tensile strength bodies in a width direction of the rubber crawler, each of said tensile strength bodies having a butt portion, each of said rows of tensile strength bodies being endless as a whole by shifting the butt portions of at least 80% of the tensile strength bodies forming each row longitudinally with respect to the butt portions of adjoining tensile strength bodies, and the butt portions of more than 75% of the tensile strength bodies being positioned within a projection of the core bars in a direction perpendicular to the plane of the core bars.
7. A rubber crawler as claimed in claim 6 , wherein each of the butt portions of the tensile strength bodies forming each row is shifted longitudinally with respect to the butt portions of adjoining tensile strength bodies.
8. A rubber crawler as claimed in claim 6 , wherein less than 40% of the tensile strength bodies forming each row have butt portions positioned within a fixed interval between adjacent core bars in the circumferential direction of the rubber crawler.
9. A rubber crawler as claimed in claim 6 , wherein the butt portions of the tensile strength bodies forming each row are positioned within planes of projection of the core bars or within planes of projection of the lugs.
10. A rubber crawler, comprising:
a rubber elastic body having lugs, said lugs being embedded in an outer peripheral side of the rubber elastic body and positioned at intervals along a circumferential direction of the rubber crawler;
metallic core bars embedded in the rubber elastic body at intervals along the circumferential direction of the rubber crawler, and a plurality of parallel tensile strength bodies embedded in the outer peripheral side of the rubber elastic body, peripherally outside the core bars, said tensile strength bodies extending in the circumferential direction of the rubber crawler and forming one or more rows of tensile strength bodies in a width direction of the rubber crawler, each of said tensile strength bodies having a butt portion, each of said one or more rows of tensile strength bodies being endless as a whole by shifting the butt portions of at least 80% of the tensile strength bodies forming each row longitudinally with respect to the butt portions of adjoining tensile strength bodies, and the butt portions of less than 25% of the tensile strength bodies being positioned within intervals between adjacent core bars in the circumferential direction of the rubber crawler.