Clutch for a gearbox

A clutch for a gearbox, the gearbox including a shaft on which at least one gear wheel, having an inner surface, is disposed, said clutch being adapted to shift the at least one gear wheel into a shift position wherein the at least one gear wheel is fixedly connected to rotate in at least one direction of the shaft, and into a neutral position wherein the at least one gear wheel is freely rotatable relative to the shaft, said clutch comprising:

• means defining clamping surfaces adapted to be situated about the circumference of the shaft and adjacent the inner surface of a respective gear wheel;
• a plurality of clamping rollers adapted to be situated about the circumference of the shaft and to be disposed between the clamping surfaces and the inner surface of a respective gear wheel thereby defining a minimum displacement which is less than the diameter of the clamping rollers and a maximum displacement which is greater than the diameter of the clamping rollers;
• a plurality of shifting disks;
• a plurality of shifting rods, with at least one of said plurality of shifting rods being associated with each shifting disk, each shifting rod extending into a space between adjacent clamping rollers;
• first spring means;
• second spring means;
• said plurality of shifting disks adapted to shift between a first position relative to the shaft into which said shifting disks are urged by said first spring means, and a second position relative to the shaft against the force of said first spring means;
• a shift bushing associated with each shifting disk;
• a sliding piece disposed on each of said shift bushings;
• and
• a synchronizing body on which each of said shift bushings is disposed, said synchronizing body adapted to be disposed on the shaft to be rotated therewith, while being axially displaceable relative thereto,
• wherein said second spring means push said clamping rollers into a frictional clamping position via said shifting rods when said associated shifting disk is displaced from said first position to said second position.