Torsion damping spring for motor vehicle, has last coil provided at each end of spring, and connected by coil of reduced diameter to preceding coil or antepenultimate coil of spring

摘要

#CMT# #/CMT# The spring (10) has a wire (12) that is wound on helical coils of constant diameter. The helical coils are non jointed at a free state, such that the spring acts as traction and compression spring. A last coil (14), at each end of the spring, is connected by a coil (16) of reduced diameter, to a preceding coil or an antepenultimate coil (18) of the spring. The coil (14) extends in a plane that is perpendicular to an axis of the spring. #CMT#USE : #/CMT# Used for being mounted in a torsion damper and in a double damping fly-wheel (claimed) of a motor vehicle. #CMT#ADVANTAGE : #/CMT# The reduced diameter of each coil permits to place it in the last coil and the antepenultimate coil in an easy manner, thus permitting to apply the last coil against the antepenultimate coil. The last coil extends in the plane that is perpendicular to the axis of the spring, thus obtaining performance similar to that of end coils that are ground. The formation of the coil with the reduced diameter permits to gain inclination angle of the helical coils, thus forming the last coil that extends perpendicular to the axis of the spring. The spring has a reduced cost for grinding ends of the spring and eliminates weakening of the end coils. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic perspective view of a torsion damping spring. 10 : Torsion damping spring 12 : Wire 14 : Last coils 16 : Reduced diameter coil 18 : Antepenultimate coils.