Energy chains for long travels, in particular with rollers

An energy chain for guiding lines, wherein the energy chain is movable such that the energy chain forms an upper run, a lower run and a deflection region connecting the upper and lower runs, the energy chain comprising:

• a plurality of side parts which are connected in a longitudinal direction to form two strands, the two strands being parallel to each other;
• cross bars connecting the two strands to each other;
• wherein each two side parts of the plurality of side parts neighbouring in the longitudinal direction constitute in each case a pair of side parts pivotable with respect to each other about a common pivot axis;
• wherein
• the plurality of side parts includes first and second side parts, wherein each of the two strands consists of the first and the second side parts succeeding each other in an alternating manner, wherein the first side parts each have two fork regions, which are opposite in the longitudinal direction, wherein each fork region has a pair of laterally spaced-apart side walls with a plate receiver in between, and wherein the second side parts each have two plate regions, which are opposite in the longitudinal direction and which in each case engage in a plate receiver of a neighbouring one of the first side parts;
• or
• each side part of the plurality of side parts comprises, opposite in the longitudinal direction, a fork region, which has a pair of laterally spaced-apart side walls with a plate receiver in between, and a plate region, which engages in a plate receiver of a neighbouring side part of the plurality of side parts;
• wherein
• in relation to one of the pairs of side parts, one side part of the pair of side parts forms a guide groove between the side walls of the fork region, wherein the guide groove is open towards the plate receiver and has laterally opposite transverse guide surfaces which extend in a circular arc shape about the pivot axis, wherein the plate region of the other side part of the pair of side parts comprises at least one guide protrusion, which has circular-arc-shaped counterfaces for guiding on the transverse guide surfaces, wherein the at least one guide protrusion engages in the guide groove.