Patent EP-2146113-B1 (EP)
Inventor: ROHS ULRICH
IPC: F16H15/42
Filed: 2009-07-07
Granted: 2011-11-02
Abstract: The friction-ring transmission (2) comprises a friction ring (5), a first friction cone (3) having a first friction-ring running surface (15), a second friction cone (4) having a second friction-ring running surface (16), and an axial friction-ring securing element for preventing critical travel of the friction ring beyond one of the first and second friction-ring running surfaces, where a gap is formed between the first and second friction cones and the friction ring is disposed to be freely displaceable axially on the first and second friction-ring running surfaces and in the gap. The friction-ring transmission (2) comprises a friction ring (5), a first friction cone (3) having a first friction-ring running surface (15), a second friction cone (4) having a second friction-ring running surface (16), and an axial friction-ring securing element for preventing critical travel of the friction ring beyond one of the first and second friction-ring running surfaces, where a gap is formed between the first and second friction cones and the friction ring is disposed to be freely displaceable axially on the first and second friction-ring running surfaces and in the gap. The axial friction-ring securing element is disposed on one of the first and second friction cones. One of the first and second friction cones is provided with a narrowing element for narrowing the gap. The axial friction-ring securing element rotates with the friction ring and/or the friction cones. The first friction-ring running surface has a first edge, the second friction-ring running surface has a second edge oppositely disposed to the first edge. The axial friction-ring securing element and/or the narrowing element are disposed on the first edge, so that the friction ring does not travel more than slightly beyond the second edge. The axial friction-ring securing element and/or the narrowing element are disposed on the first friction cone partly axially above the second friction-ring running surface. The axial friction-ring securing element and/or the narrowing element are disposed on an axial end of the first friction-ring running surface with the smaller friction-ring running-surface circumference. The narrowing element comprises a shoulder at an axial end of the first friction-ring running surface axially limiting the first friction-ring running surface, where shoulder has an undercut facing the first friction-ring running surface. The axial friction-ring securing element comprises a shoulder at an axial end of the first friction-ring running surface axially delimiting the first friction-ring running surface, where the shoulder has an undercut facing the first friction-ring running surface. The shoulder is lathed onto one of the friction cones. The shoulders are provided axially on first and second sides of the gap. Edge radii are provided on an edge of the friction ring facing the axial friction-ring securing element and/or the narrowing element and the friction cone, on which the friction-ring securing element and/or the narrowing element are disposed, and have a radius greater than 1/27 of the friction-ring width. A bearing surface is provided on the axial friction-ring securing element and/or the narrowing element, where the bearing surface rotates around an axle aligned parallel to an axis of rotation of the friction ring. The friction-ring transmission comprises naphthalene oil traction fluid. An independent claim is included for a method for producing a friction cone.