Cambered pin CVT chain belt

A power transmission chain-belt for driving connection between driving and driven pulley members having convergent faces comprising:

• a plurality of sets of links interleaved with other adjacent sets of links, each link having a pair of longitudinally spaced apertures, the apertures of one set of links being transversely aligned with the apertures of an adjacent set of links;
• load block means engaging each set of links, the load block means being oriented generally transversely with respect to the links and having end surfaces adapted to engage the faces of the pulley members;
• and
• generally oval pivot members positioned in the aligned apertures to provide interconnection between the adjacent sets of links, the pivot members having a length such that both end surfaces thereof do not simultaneously contact opposing faces of the pulley members, the faces and pivot members being oriented such that the faces can contact the end surfaces of the pivot members to urge the pivot members toward a predetermined position in the chain-belt upon contact with the faces, the pivot members not otherwise being positively mechanically held in position in the apertures.

A power transmission chain-belt for driving connection between driving and driven pulley members having convergent faces comprising:

• a plurality of sets of links interleaved with other adjacent sets of links, each link having a pair of longitudinally spaced apertures, the apertures of one set of links being transversely aligned with the apertures of an adjacent set of links;
• load block means engaging each set of links, the load block means being oriented generally transversely with respect to the links and having end surface adapted to engage the faces of the pulley members;
• and
• generally oval pivot members positioned in the aligned apertures to provide interconnection between the adjacent sets of links, the pivot members having a length such that both end surfaces thereof do not simultaneously contact opposing faces of the pulley members, the faces and pivot members being oriented such that the faces can contact the end surfaces of the pivot members to urge the pivot members toward a predetermined position in the chain-belt upon contact with the faces, the pivot members not being positively mechanically fastened to the chain-belt.

A power transmission chain-belt for transferring drive between a pair of pulleys, each pulley having opposed flanges, the chain-belt comprising

• sets of links, each link defining a pair of spaced, generally hour-glassed shaped apertures and a pair of oppositely disposed tabs adjacent one end of the link;
• a plurality of load blocks, each block defining a pair of central windows encircling the central portion of a link set, the load block outer edges contacting the pulley flanges as the chain belt articulates, and the link tabs preventing rocking of the load blocks during articulation;
• the apertures of one set of links being transversely aligned with the apertures of an adjacent set of links;
• and,
• a pair of elongated pins, generally D-shaped in cross section, positioned in each aligned set of apertures, each pin being slightly cambered along the longitudinal pin axis, the camber of each pin in a pair of pins being opposite to the camber of the other pin in that pair, the camber providing a load sufficient to retain the pin pairs in an operative position during assembly and subsequent handling of the chain-belt, with the tension produced in operation of the chain-belt around the pulleys acting to flatten out the pins in each pair against each other, thus providing full rocking face contact between the pins in each pair.