Power tool

A power tool configured to actuate a tool being attachable to the power tool, comprising:

• a driving mechanism which is adapted to actuate the tool, the driving mechanism configured with a motor including a driving shaft;
• a driving mechanism chamber, the driving mechanism chamber defining an inner space which houses the driving mechanism;
• an outside communicating chamber which is provided at a distal end area of the driving shaft such that the outside communicating chamber is separated from the driving mechanism chamber and is communicated with the outside of the driving mechanism chamber;
• and
• a lubricant which is provided in the inner space of the driving mechanism chamber for lubricating the driving mechanism,
• wherein the motor includes a first opening, a second opening and a passage which connects the first opening and the second opening, thereby the passage communicates with the inner space of the driving mechanism chamber via the first opening and further communicates with an outer space of the driving mechanism chamber via the second opening,
• wherein at least a part of the passage extends inside the driving shaft of the motor and connects to the second opening, and
• wherein the second opening opens in a distal end face of the driving shaft and is communicated with the outside communicating chamber.

A power tool configured to rotationally drive a tool, the power tool comprising:

• a motor;
• a power transmission mechanism configured to be driven by the motor, the power transmission mechanism configured to rotationally drive the tool;
• a driving mechanism chamber which houses the power transmission mechanism;
• and
• a lubricant for lubricating the power transmission mechanism, which is provided inside the driving mechanism chamber,
• wherein the power transmission mechanism includes an electromagnetic clutch configured to transmit power and interrupt a power transmission from the motor to the tool based on a driving status of the power tool,
• wherein the electromagnetic clutch is provided with a driving rotational member and a driven rotational member, the electromagnetic clutch being adapted to transmit power by engaging the driving rotational member and the driven rotational member to each other and to interrupt the power transmission by cancelling an engagement among the driving rotational member and the driven rotational member,
• wherein an engagement region of the driving rotational member and the driven rotational member, the engagement region which is provided inside the driving mechanism chamber being separated from the lubricant by a sealing member,
• wherein the electromagnetic clutch includes an input shaft to which power of the motor is inputted and an output shaft which outputs the power toward the tool, the input shaft and the output shaft being arranged coaxially,
• wherein both of a power input part which inputs the power to the input shaft and a power output part which outputs the power from the output shaft are arranged at one side of a line perpendicular to an axial line of the input shaft and the output shaft with respect to the engagement region, and
• wherein the sealing member is arranged at a position between the input shaft and the output shaft, as well as at a position between one component being arranged at an outside position among the input shaft and the output shaft and an inside wall of the driving mechanism chamber.