JP2006043790A - Portable motor-driven tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable router provided with a motor having a further longer service lifetime. <P>SOLUTION: The portable router with the motor having a further longer service lifetime, can be provided by arranging an elastic material between the outer peripheral part of a rotary shaft bearing of the motor of the portable router and a housing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a portable power tool such as a portable router having a cutter attached to a rotor tip of a motor via a chuck.

  The structure of a conventional portable router will be described with reference to FIGS.

  As shown in FIGS. 2 and 3, the portable router includes a motor, two bearings 2 and 3 that support the rotor 1 of the motor, a relatively hard housing 4 that houses the motor, and a rotor of the motor. A chuck 5 attached to one tip portion, and a cutter 6 having two blades attached to the tip portion of the rotor 1 of the motor via the chuck 5 are provided. The bearings 2 and 3 are directly press-fitted into the housing 4.

  When the work material is cut by the portable router having the above-described configuration, the cutting work is performed in a state where the rotor 1 of the motor is positioned at right angles to the work material. The blade 6 at the tip of the rotor 1 has a small number of blades, and is in a state where the work material is being cut off intermittently during the cutting operation, so that the vibration applied to the rotor 1 during the operation becomes large, and the rotor 1 and the blade 6 are cut. Is directly connected, the reaction force received from the work material is directly transmitted to the rotor 1. On the other hand, the outer peripheries of the bearings 2 and 3 of the rotor 1 are fixed to the housing 4, and the vibration received during cutting is easily transmitted to the rotor 1, the bearings 2 and 3 and the housing 4 of the motor.

  In the conventional portable router structure as described above, since the rotor 1 of the motor is joined to the housing 4 via the bearing, the impact received by the rotor 1 during the cutting operation is not dispersed, and the rotor 1 The impact will be directly applied to. At this time, vibration is transmitted to the bearing together with the rotor 1, and the bearing hits the bearing press-fitting surface of the housing 4, so that more impact is applied to the rotor. If a long-time cutting operation is performed in this state, the rotor 1 may be disconnected or burnt due to intermittent vibration caused by this, leading to a reduction in motor life.

  An object of the present invention is to provide a portable electric tool having a motor having a longer life, which eliminates the above-mentioned conventional drawbacks.

  The object is achieved by providing an elastic material between at least one outer peripheral portion of the motor rotating shaft bearing and the housing.

  ADVANTAGE OF THE INVENTION According to this invention, the portable router provided with the motor with a longer lifetime can be provided by providing an elastic material between a motor rotating shaft bearing outer peripheral part and a housing.

  An embodiment of the portable router of the present invention will be described with reference to FIG. In addition, except the structure demonstrated below, it is the same structure as the portable router of the above-mentioned prior art.

  As shown in FIG. 1, a groove for accommodating an elastic material is provided on the bearing 3 press-fitting surface of the rotor 1 of the housing 4, and a circular elastic material 7 (eg, rubber, hereinafter referred to as rubber) is fitted therein. The inner diameter of the rubber 7 is the same as the outer diameter of the bearing 3, and the outer peripheral portion of the bearing 3 is suppressed by the inner peripheral portion of the rubber 7. At this time, the bearing 3 and the housing 4 are joined via the rubber 7.

  When the cutting operation is performed in this state as described above, the impact transmitted to the rotor 1 through the blade 6 is dispersed and absorbed by the elastic force of the rubber 7 attached to the outer periphery of the bearing 3. As a result, the impact directly transmitted from the blade 6 during cutting is relieved and the phenomenon in which the bearing 3 hits the housing 4 can be prevented, so that the fatigue accumulated in the motor is reduced and the life of the motor can be extended.

  With the above structure, a portable router provided with a motor having a longer life can be provided.

The motor attachment structure figure showing one embodiment of the portable electric tool of the present invention. The front view which shows an example of the conventional portable router. The principal part enlarged view of FIG.

Explanation of symbols

1 is a motor, 2 is a bearing of a rotating shaft, 3 is a bearing of a rotating shaft, 4 is a housing, 5 is a chuck, 6 is a cutter, and 7 is an elastic body.

Claims (1)

A motor, a housing that houses the motor, and a blade that is attached to the rotor tip of the motor via a chuck, and an elastic material between at least one outer peripheral portion of the bearing that supports the rotor and the housing A portable power tool characterized by comprising:

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