Patent ID: 6468180
Filing Date: 2002-10-22
Classification: F16H

Abstract:
A toroidal continuously variable transmission comprising:an input shaft rotated by a driving source; a input disk supported on the input shaft; a output disk supported on the input shaft and opposed to the input disk; a power roller swingably provided between the input disk and the output disk and rotatably put in contact with both disks; and a compression device having a cam disk supported on the input shaft, wherein at least one of the input disk and the output disk is machined to provide it with a protrusion which has an end surface and which projects in a central portion thereof along the axis; a bottom surface located on the rear side of the end surface of the protrusion; and a traction surface which is put in contact with the power roller; wherein a reference line (V) extends through a center (&agr;) of a curvature of the traction surface along the axis, a first line segment (V1) extends through the center (&agr;) of curvature of the traction surface at an angle (&thgr;1) of 15Â° with respect to the reference line (V), a second line segment (V2) extends through the center (&agr;) of curvature of the traction surface at an angle (&thgr;2) of 60Â° with respect to the reference line (V), and wherein an end of a metal flow does not exit on the traction surface between the first line segment (V1) and the second line segment (V2); and wherein an end of a metal flow on the bottom surface of the disk does not exist in a region defined by two lines extending from a center (&agr;) of curvature of the traction surface and diverging in opposite directions from a line segment (V3) at an angle of +10Â° and âˆ’10Â°, respectively, said line segment (V3) extending between the center (&agr;) and a point (N) where the power roller contacts the traction surface at the time of maximum deceleration or maximum acceleration.