Power tool having noise reducing structure

Abstract

A power tool includes a container having a chamber to receive a motor which has a spindle attached to a pinion and extended out of the pinion. A reduction gearing includes a housing attached to the motor and having an internal gear, two plates rotatably received in the housing and each having three rotatable gears. The pinion is engaged with the gears of one of the plates which has another pinion engaged with the gears of another plate, to allow the plates and the gears to be rotated by the motor. The pinion of the motor is extended through one of the plates, to smoothly support the plates and the gears within the housing, and to reduce shocks, vibrations, or noises that may be generated by the plates and the gears.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a power tool, and more particularly to a power tool having a structure for reducing shocks and vibrations, and thus for reducing noises, and for allowing the power tool to be smoothly driven and operated to effectively rotate or drive fasteners. [0003] 2. Description of the Prior Art [0004] Various kinds of typical power tools have been developed and comprise a reduction gearing coupled to a motor, for being rotated or driven by the motor, to rotate fasteners. [0005] For example, U.S. Pat. No. 6,458,058 to Fu discloses one of the typical power tools comprising a reduction gearing having three or more gears coupled to a pinion of a motor, for being rotated or driven by the motor, to rotate fasteners. Normally, the pinion of the motor is directly engaged within or between the gears, to rotate or drive the gears. [0006] The gears are received in an internal gear disk and engaged with an...

AI Technical Summary

Benefits of technology

[0009] The primary objective of the present invention is to provide a power tool including a structure for reducing shocks and vibrations, and thus for reducing noises, and for allowing the power tool to be smoothly driven and operated to effectively rotate or drive fasteners.

[0010] In accordance with one aspect of the invention, there is provided a power tool comprising a body including a container provided thereon, the container including a chamber formed therein, a motor received in the chamber of the container, and including a spindle, a first pinion attached onto the spindle, and the spindle of the motor being extended outwardly beyond the first pinion, and a reduction gearing received in the chamber of the container, and including a housing attached to the motor and having an internal gear provided therein. The reduction gearing includes a first plate and a second plate rotatably received in the housing, three first gears rotatably attached to the first plate, and engaged with the first pinion, to allow the first gears and the first plate to be rotated by the motor, the first plate including a second pinion extended therefrom and having a bore formed therein to receive the spindle of the motor, and to smoothly support the first plate in the housing. The reduction gearing further includes three second gears rotatably attached to the second plate, and engaged with the second pinion of the first plate, to allow the second gears and the second plate to be rotated by the motor via the first plate and the first gears, and a driving device is attached to the second plate, and thus rotated by the motor via the first plate and the second plate. The first plate may be smoothly received and supported within the housing, such that the first gears and the second gears and thus the second plate may also be smoothly received and supported within the housing, such that greatly reduced shocks and vibrations or noises will be generated by the gears and the plates, and such that the power tool may be smoothly driven and operated to effectively rotate or drive fasteners.

Problems solved by technology

However, the internal gear disk has not been rotatably supported within a housing with any supporting devices or members, such that the internal gear disk may not be smoothly rotated within the housing, and may vibrate relative to the housing, and thus may generate great noises while working.

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