Work tool and transmission system thereof

Transmission system for a work tool, comprising:

• a first shaft;
• a second shaft, a near end of the second shaft having a first mating part;
• and
• a shaft coupler, a far-side part of the shaft coupler having a second mating part matched in shape to the first mating part;
• wherein the transmission system further comprises a coupling mechanism capable of directly or indirectly applying a coupling force to at least one of the first shaft, the second shaft and the shaft coupler;
• wherein the shaft coupler is configured to transmit rotational movement of the first shaft to the second shaft when the far-side part of the shaft coupler is aligned with the near end of the second shaft in a circumferential direction such that the coupling force forces the first mating part to engage with the second mating part;
• wherein a near-side part of the shaft coupler comprises a first shaft hole for accommodating a far end of the first shaft, the far-side part of the shaft coupler comprises a second shaft hole for accommodating the near end of the second shaft;
• and
• wherein the far-side part of the shaft coupler further comprises a guide channel defined by an end wall of the shaft coupler extending between a far-end opening of the shaft coupler and the second shaft hole, a cross section of the guide channel gradually decreases in size from the far-end opening towards the second shaft hole;
• and
• wherein the coupling mechanism comprises a first biasing element arranged at least partially around the far end of the first shaft for applying a first axial biasing force to the shaft coupler and a second biasing element arranged at least partially around a near end of the first shaft for applying a second axial biasing force to the first shaft, and wherein the first shaft and the shaft coupler are configured to rotate until the far side part of the shaft coupler is aligned with the near end of the second shaft in the circumferential direction and one or both of the first axial biasing force and the second axial biasing force pushes the shaft coupler towards the far side such that the second shaft enters the second shaft hole.