Patent ID: 8141402
Filing Date: 2012-03-27
Classification: B21L,F16G

Abstract:
1. A pretension loading method for a power transmission chain, in which a chain with an endless loop shape including a plurality of laminated link plates bendably connected to each other by pin members is wound around a plurality of rollers and the chain is endlessly rotated while a load is loaded on the chain so as to load pretension on the chain, the method comprising: a first maintaining of the chain in a substantial tension state without a slack by controlling tension of at least one of the plurality of rollers while endlessly rotating the chain; a first measuring of a length of the chain in the tension state; plastically deforming the chain to a target length by controlling a displacement of the at least one of the rollers to a predetermined location; a second maintaining of the chain in an other substantial tension state without a slack, the other tension state comprising a tension less than a tension required to cause plastic deformation of the chain by controlling tension of the at least one of the rollers; and a second measuring of the length of the chain in the other tension state, wherein the plastically deforming the chain, the second maintaining and the second measuring are repeated until a difference between the target length and the length of the chain which is measured in the second measuring is less than a predetermined value.