Reduction group

A reduction group for a vehicle, positionable between a power group and a wheel group of the vehicle, wherein the reduction group extends along a group axis and comprises:

• a ring gear;
• a central sun gear adapted to be connected to the power group;
• a planetary gear holder adapted to be connected to the wheel group;
• and
• at least one planetary gear housed on the planetary gear holder, preferably a plurality of planetary gears, comprising:
• a gear meshed externally with the ring gear and internally with the central sun gear;
• a planetary gear shaft extending along a planetary gear axis substantially parallel to the group axis, fixed to the planetary gear holder;
• and
• a pair of bearings supporting the gear on the planetary gear shaft;
• wherein the planetary gear shaft and the planetary gear holder are engaged through adjustment means, and the planetary gear shaft is adjustable on the planetary gear holder along the planetary gear axis in an operational configuration in which the planetary gear shaft performs an axial tightening action on the pair of bearings exhibiting an axial clearance adapted to allow rotation of the pair of bearings;
• wherein the planetary gear shaft comprises a head end operable to configure a configuration of the planetary gear shaft on the planetary gear holder.

A reduction group for a vehicle, positionable between a power group and a wheel group of the vehicle, wherein the reduction group extends along a group axis and comprises:

• a ring gear;
• a central sun gear adapted to be connected to the power group;
• a planetary gear holder adapted to be connected to the wheel group;
• and
• at least one planetary gear housed on the planetary gear holder, preferably a plurality of planetary gears, comprising:
• a gear meshed externally with the ring gear and internally with the central sun gear;
• a planetary gear shaft extending along a planetary gear axis substantially parallel to the group axis, fixed to the planetary gear holder;
• and
• a pair of bearings supporting the gear on the planetary gear shaft;
• wherein the planetary gear shaft and the planetary gear holder are engaged through adjustment means, and the planetary gear shaft is adjustable on the planetary gear holder along the planetary gear axis in an operational configuration in which the planetary gear shaft performs an axial tightening action on the pair of bearings exhibiting an axial clearance adapted to allow rotation of the pair of bearings;
• the reduction group further comprising locking means configurable in a locking configuration in which the locking means engage the planetary gear shaft by locking an axial movement thereof;
• wherein the locking means comprise a locking grub screw movable transversely to the planetary gear axis.

A reduction group assembly for a vehicle, positionable between a power group and a wheel group of the vehicle, comprising a reduction group positionable between the power group and the wheel group of the vehicle, the reduction group extending along a group axis and comprising:

• a ring gear;
• a central sun gear adapted to be connected to the power group;
• a planetary gear holder adapted to be connected to the wheel group;
• and
• at least one planetary gear housed on the planetary gear holder, preferably a plurality of planetary gears, comprising:
• a gear meshed externally with the ring gear and internally with the central sun gear;
• a planetary gear shaft extending along a planetary gear axis substantially parallel to the group axis, fixed to the planetary gear holder;
• and
• a pair of bearings supporting the gear on the planetary gear shaft;
• wherein the planetary gear shaft and the planetary gear holder are engaged through adjustment means, and the planetary gear shaft is adjustable on the planetary gear holder along the planetary gear axis in an operational configuration in which the planetary gear shaft performs an axial tightening action on the pair of bearings exhibiting an axial clearance adapted to allow rotation of the pair of bearings, and
• a box adapted to contain the reduction group, wherein said box comprises an adjustment opening through which the planetary gear shaft is operable for adjustment.