| 摘要 |
<p>A device for stretching a transmission chain (2) which is closed in itself and is made up from a number of adjacent links (4) which are, in the longitudinal direction of the chain, mutually intercoupled by pairs of longitudinal rocker elements (6,8) in which the ends of at least one rocker element (6,8) operate torque transmittingly with the pulley sheaves of a pulley sheave transmission, comprising at least two supporting surfaces (10,12) lying at a distance of each other and supporting a chain (2) according to an arc, and provided with means to generate in this chain (2) a tensile force leading to a surpassing of the limit of elasticity of the link material.</p><p>To improve the stretching and more particularly to prevent an uncontrolled bending of the rocker elements (6,8) with all drawbacks thereof the invention proposes that at least one of the supporting surfaces (10,12) is configured to support the radial inner area of at least a part of the chain (2). This bending of the rocker elements (6,8) is prevented and the treatment of the chain is improved considerably.
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