Work tool

A work tool configured to drive a tool accessory in an oscillating manner to perform a processing operation on a workpiece, the work tool comprising:

• a housing;
• a spindle supported by the housing to be rotatable around a first rotational axis;
• a motor housed in the housing and including a stator, a rotor, and a first shaft, the first shaft extending from the rotor and being configured to rotate integrally with the rotor around a second rotational axis;
• a transmitting mechanism configured to transmit rotation of the first shaft to the spindle to cause the spindle to rotary oscillate around the first rotational axis;
• and
• a heat dissipation part,
• wherein:
• the transmitting mechanism comprises:
• a second shaft made of metal and coaxially coupled to the first shaft and having an eccentric part that is eccentric to the second rotational axis;
• a drive bearing including an inner ring fixed around the eccentric part, an outer ring, a retainer made of plastic and between the inner ring and the outer ring, and a plurality of rolling elements rollably retained by the retainer;
• and
• an oscillating member having a first end portion fixed to the spindle and a second end portion abutting on an outer periphery of the outer ring of the drive bearing;
• the heat dissipation part is made of metal, in contact with the second shaft and configured to rotate integrally with the second shaft;
• and
• the housing has a first path that directs an airflow for cooling the motor to the motor and a second path that (i) is different from the first path and (ii) directs an airflow to the heat dissipation part for cooling the heat dissipation part.