Abstract: A chain for a V-pulley which is used by being endlessly trained between a pair of V-pulleys and in which blocks each having an end surface for coming into contact with the V-pulley are respectively disposed on the outer sides of outer link plates. The end surface of the block is formed into a convex surface constituted by the whole or part of a conical surface which has substantially the same apex angle as that of the inner wall of the V-pulley and has an axis parallel to the axis of a connecting pin. The block may be fixed with respect to the outer link plate or may be made rotatable about the axis of the cone.

Abstract: A power transmission belt having a flexible chain link midportion 11 defining a longitudinally continuous belt structure having opposite laterally outer side portions. Mounting elements 14,15 protrude from the side portion at spaced intervals longitudinally of the belt and side elements 16 are freely adjustably mounted one each to the protruding mounting element portions 15. The side elements define an outer surface for engaging the sidewall of a drive pulley V-groove. The invention further comprehends the provision of positioning elements 26 for retaining the side elements on the mounting elements, with the outer surfaces 17 of the side elements generally parallel to the V-groove sidewalls of the pulley for facilitating facial engagement of the side elements with the sidewall of the pulley groove when brought thereinto.

Abstract: A power drive system including a toothed belt (10) arranged for improved engagement with a grooved pulley (15). The belt teeth (13) define, in longitudinal cross section, planar flank surfaces (22, 23) and an intermediate arcuate tip surface (25). The pulley groove (14) has corresponding planar flank surfaces (17, 18). The arcuate distal portion of the belt tooth is disposed within an arcuate segment centered on the point of intersection (19) of a flank surface (17) of the belt pitch line (20) defined by the tensile members (12) of the belt body portion. The tooth tip portion (25) defines a circular cross section centered on a point (37) disposed within a preselected range on the tooth centerline (24).