Multi-disc transmission

A multi-disc transmission, comprising;

• an input shaft configured such that rotation from a power source is input to the input shaft;
• an output shall arranged in parallel to the input shaft;
• a primary disc provided on the input shaft;
• a secondary disc provided on the output shaft, the secondary disc including a disc overlap region overlapping the primary disc,
• a pair of pressing rollers arranged in the disc overlap region with the primary disc and the secondary disc interposed therebetween, the pair of pressing rollers being supported on shaft portions via needle bearings;
• a shifting actuator configured to move the pair of pressing rollers between the input shaft and the output shaft;
• and
• a pressing mechanism configured to press the pair of pressing rollers against the primary disc and the secondary disc by causing a pressing force to act on the pair of pressing rollers,
• a surface roughness of a disc held in contact with the pressing roller out of the primary disc and the secondary disc being smaller on a surface located on the side of the pressing roller than on a surface opposite to the pressing roller