A power tool comprises a driving mechanism and a gear housing space (105a) which houses the driving mechanism. A lubricant is provided to the driving mechanism inside a gear housing (105). The driving mechanism includes a driving motor (110) having a motor shaft (111). The motor shaft (111) includes
A power tool comprises a driving mechanism and a gear housing space (105a) which houses the driving mechanism. A lubricant is provided to the driving mechanism inside a gear housing (105). The driving mechanism includes a driving motor (110) having a motor shaft (111). The motor shaft (111) includes an inner communicating opening (191), an outer communicating opening (192) and an air passage (193) which connects the inner communicating opening (191) and the outer communicating opening (192). At least a part of the air passage (193) is arranged inside the motor shaft (111), and the passage (193) communicates with the gear housing space (105a) via the inner communicating opening (191) and also communicates with the outer space of the gear housing (105) via the outer communicating opening (192).
대표청구항▼
1. 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 rotational member including a rotational shaft;a driving mechanism chamber, the driving mechanism chamber def
1. 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 rotational member including a rotational shaft;a driving mechanism chamber, the driving mechanism chamber defining an inner space which houses the driving mechanism; anda lubricant which is provided in the inner space of the driving mechanism chamber for lubricating the driving mechanism,wherein the rotational member 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 is arranged inside the rotational shaft,wherein a part of the passage extends in a radial direction of the rotational member and connects to the first opening,wherein a part of the passage extends inside the rotational shaft in an axial direction of the rotational shaft and connects to the second opening, andwherein the second opening opens in an end face of the rotational shaft in the axial direction. 2. The power tool according to claim 1, wherein the passage connects to the second opening such that the passage is arranged to include an axis line of the rotational shaft and to extend to be parallel to the axis line. 3. The power tool according to claim 1, wherein the driving mechanism includes a motor and a driven member which is driven by the motor, and wherein the rotational member is defined by the driven member. 4. The power tool according to claim 3, wherein the driving mechanism includes a crank mechanism which converts a rotational motion of the driving shaft of the motor to a linear motion, and wherein the driven member is defined by a crank shaft of the crank mechanism. 5. The power tool according to claim 1, wherein the passage is provided with a plurality of chambers connected to one another. 6. The power tool according to claim 1, wherein the rotational member is provided with an internal chamber located along the passage and configured to store a predetermined volume of lubricant while allowing pressurized gases from within the driving mechanism chamber to escape past the predetermined volume of lubricant via the second opening. 7. The power tool according to claim 1, wherein the driving mechanism includes a motor and an electromagnetic clutch which is disposed between the motor and the tool, the electromagnetic clutch being adapted to interrupt a power transmission from the motor to the tool based on a driving status of the power tool. 8. 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; anda 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, andwherein the second opening opens in a distal end face of the driving shaft and is communicated with the outside communicating chamber. 9. 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; anda 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, andwherein 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. 10. The power tool according to claim 9, wherein the input shaft is provided as another shaft from a motor shaft of the driving motor, and defined as an intermediate shaft which is arranged between the motor shaft and the tool. 11. The power tool according to claim 9 wherein the output shaft is arranged at the inside of the input shaft with respect to a radial direction of the input shaft. 12. The power tool according to claim 9, wherein the electromagnetic clutch has a field which houses an electromagnetic coil therein, and wherein the inside wall is adapted to prevent the field from rotating with the electromagnetic clutch while the electromagnetic clutch is transmitting the power. 13. The power tool according to claim 9, wherein the tool is defined as a bit being elongated and being rotatable around a longitudinal direction of the bit, and wherein the electromagnetic clutch is adapted to prevent the power tool from being swung inadvertently around the longitudinal direction by interrupting the power transmission in a state that the bit is locked by a workpiece. 14. The power tool according to claim 13, wherein the electromagnetic clutch is adapted to interrupt the power transmission in a state that a torque applying to the bit and/or a velocity or an acceleration applying to a body of the power tool is not less than a predetermined threshold.
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이 특허에 인용된 특허 (6)
Berghauser, Ulrich; Friedrich, Andreas; Frantisek, Harcar, Lubricant system for powered hammer.
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