POWER TOOL COUNTERWEIGHT ARRANGEMENT AND MASS MEMBER

摘要

A power tool may include a motor and a drive shaft having a first end coupled to the motor and a second end eccentrically coupled to a platen by a retainer bearing and eccentric sleeve. A counterweight component may be coupled to the second end of the drive shaft to counteract imbalance generated by rotation of the retainer bearing, eccentric sleeve and platen. The counterweight component may include a counterweight coupled to the second end of the drive shaft, between the eccentric sleeve and the platen. Alignment of the counterweight may be offset with respect to a centerline of the drive shaft to counteract vibration generated due to interaction of the platen with a workpiece. The counterweight component may also include a counterweight mass member coupled to a sector of the counterweight to counteract vibration generated due to interaction of the platen with a workpiece.

主权项

1. A power tool, comprising:
a housing; a motor in the housing; a drive shaft, a first end portion of the drive shaft being coupled to the motor; a platen; a retainer bearing coupled to a first surface of the platen; an eccentric sleeve coupled to a second end portion of the drive shaft, the eccentric sleeve being coupled in the retainer bearing to eccentrically couple the drive shaft to the platen; an eccentric mass, including the eccentric sleeve, the retainer bearing and the platen coupled to the second end portion of the drive shaft; and a counterweight coupled to the second end portion of the drive shaft, between the first surface of the platen and the eccentric sleeve, wherein the counterweight is positioned such that a counterweight axis defined along a radial centerline of the counterweight is offset by a predetermined angle with respect to an orbit radius axis of the eccentric mass.