Transmission, and running vehicle equipped with such a transmission

A transmission comprising:

• a shaft made as a single piece or as at least two shaft sections on a common axis;
• a drive toothed wheel mounted to rotate freely on said shaft;
• and
• either a clutch mechanism arranged between the shaft and the drive toothed wheel when the shaft is made as a single piece, or else two clutch mechanisms arranged one between one section of the shaft and the drive toothed wheel, and the other between the other section of the shaft and the drive toothed wheel,
• wherein the clutch mechanism or each clutch mechanism is activated by driving the drive toothed wheel in rotation in a first forward rotary drive direction, and is deactivatable by driving the shaft or the shaft section with which it co-operates in rotation in the forward direction when the speed of rotation of the shaft or of said shaft section is greater than the speed of rotation of the drive toothed wheel,
• wherein the shaft or each shaft section in the deactivated state of the corresponding clutch mechanism is free to rotate in either direction of rotation,
• the clutch mechanism or each clutch mechanism having;
• a clutch plate mounted to rotate freely on the associated shaft or shaft section and to which the rotary motion of the drive toothed wheel is suitable for being transmitted;
• and
• a part carried by and constrained to rotate with the associated shaft or shaft section;
• and
• a brake of said clutch plate acting continuously on the angular speed of said plate;
• wherein the brake of the, or of at least one of the, clutch plates is threaded on the shaft or on the shaft section carrying said plate,
• wherein the brake of the clutch plate, or of at least one of the clutch plates comprises two spring blades extending along the shaft or the shaft section carrying said clutch plate, and a connection zone for connecting said spring blades together, said connection zone arranged at or in the vicinity of one of the ends of the spring blades, being provided with a through orifice to enable said brake to be threaded on the shaft or the shaft section carrying said clutch plate.