JPH1029173A - Assembling method for dc motor driven power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize light weight, down sizing, and a low cost, assemble a power tool by a consistent conveyor system from the assembly of a motor to the completion of the power tool, and allow simply any person to open the motor inside, and effectively prevent the propagation of vibration. SOLUTION: A magnet on a stator side, into which a rotor constituting part of a motor is inserted, is fixed to a cylindrical body 2 formed of magnetic material. Moreover, in this constitution, the cylindrical body 2 is fitted to the housing 5A portion of a power tool formed of insulating material, via O ring 6A, 6B, and 6C, and a brush holder 111' constituting part of the motor is directly fitted to the housing 5A portion to assemble the main part of the motor by utilizing the housing 5A of the power tool.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a DC motor-driven power tool which is particularly suitable for reducing the weight and size of a power tool body and a motor.

[0002]

2. Description of the Related Art For example, a DC motor is frequently used as a driving means for various electric tools such as an electric screwdriver. However, as shown in FIG. It is assembled as a single unit, and then mounted inside the housing 101 of the power tool.

As is well known, the DC motor 100 generally has a central rotor and a stator provided around the rotor. When assembling these components, for example, FIG. Then, it is assembled as follows.

First, an armature 103, which is a main component on the rotor 102 side, is assembled. In addition, a bearing 105A on one side is provided on the inner bottom surface of a cylindrical body 104 formed into a bottomed cylindrical shape using a magnetic material such as iron, and a magnet 106 is attached to an appropriate portion on the inner peripheral surface side. . Furthermore, this cylindrical magnet 1
An iron frame 107 for forming a magnetic circuit is mounted on the outer peripheral surface side corresponding to the 06 mounting site. That is, this completes the stator 108.

Next, a rotor 102 having a rotating shaft 112
Is inserted into the cylindrical body 104. Further, the cover 109 formed in a substantially disc shape using a conductor such as an appropriate iron material is provided with a bearing 105B on the other side, and an insulator 110 formed of a synthetic resin is fixed to the inner peripheral surface. The brush holder 111 is attached to the body 110. The lid 109 thus formed is set in the opening of the cylinder 104, and the opening end of the cylinder 104 is squeezed and caulked to mechanically fix the lid 109 integrally.

[0006]

As described above, in the manufacture of the motor, for example, the cylindrical body has a margin for holding a bearing brush holder and the like, and the cover provided with the brush holder has a cover. Because of the provision of an insulator and the like, it is bulky in weight and structurally complicated, and requires an extra cost.

Further, depending on the power tool to be used, an impact may be caused during use. In particular, in the case of a heavy armature, it is necessary to prevent the transmission of vibration and to improve the mechanical strength. When the motor is operated, the internal vibration is transmitted to the operator's hand, which may cause discomfort during the operation or reduce the workability.

Furthermore, it has been difficult to improve workability in assembling a power tool including a motor, and particularly to perform a consistent flow from motor assembly to completion of the power tool. Also, in the case of simple replacement of parts due to failure, maintenance and inspection, etc., the inside of the motor can not be easily opened because it is caulked and mechanically fastened, so the whole motor is replaced in its entirety It is necessary.

In view of the above circumstances, the present invention can reduce the size and weight and reduce the cost.
DC motor drive electric motor that can be performed in a consistent flow from assembly of the motor to completion of the power tool, and that anyone can easily open the inside of the motor and effectively prevent transmission of vibration. It is an object of the present invention to provide a method for assembling a tool.

[0010]

That is, according to the first aspect of the present invention, a stator-side magnet in which a rotor constituting a part of a motor is inserted is fixed to a cylindrical portion made of a conductive material. The cylindrical body is attached to a housing portion of a power tool formed of an insulating material via an anti-vibration member, a brush holder constituting a part of a motor is directly attached to the housing portion, and the housing is used. Thus, the components of the motor are assembled.

[0011]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In this embodiment, the same parts as those in the prior art are denoted by the same reference numerals, and redundant description will be avoided. The method of assembling a DC motor-driven electric tool according to the present invention is divided into two stages, a pre-stage (manufacturing of a semi-finished motor) and a post-stage (assembly of a semi-finished motor to a power tool housing). These will be described with reference to FIGS. 1 and 2, respectively.

FIG. 1 shows the first half of a method for assembling a DC motor-driven electric tool according to the present invention. In this method for assembling a DC motor, a semi-finished motor (hereinafter referred to as a semi-finished motor) 1 is used. To manufacture.

In this semi-finished motor 1, the cylindrical body 2 constituting a part of the stator is made of a magnetic material such as iron and has a minimum width W.
(Almost the same width as the conventional iron frame), and the conventional iron frame is not used and is also used by the cylinder 2. Here, the rotor 103 is formed in a conventional manner.

In this semi-finished motor 1, the end portions of the conventional lid and cylindrical body are not provided, but are also used for the housing 101 'of the electric tool (see FIG. 2). Are assembled into the housing 5. In the drawing, reference numeral 3 denotes a brush, and 4 denotes a commutator.

That is, the cylindrical body 2 is formed in a substantially cylindrical shape from the conventional cylindrical body shown by a broken line in FIG. 1 without providing both ends, except for a central portion. 2 is mounted on the housing 5 shown in FIG. Also, in the state of the semi-finished motor 1, a large open space is open, so that the power supply wiring cord 1A can be attached using the open space.

Next, referring to FIG. 2, the latter half of the method of assembling the DC motor-driven electric tool according to the present invention, that is, the method of assembling the semi-finished motor 1 shown in FIG. explain. FIG. 2 shows a housing 5 of the power tool according to the present invention.
The housing 5 is formed by joining a pair of half halves 5A vertically divided into two. After setting the semi-finished motor 1 on one half 5A, the other half 5A is covered. It can be completed by joining with screws.

A groove 51 is formed in the half body 5A over the entire circumference of the left and right two places at the portion where the cylindrical body 2 is set, and this groove 51 is provided with a rubber material or the like for damping vibration. The O-ring 6A formed by the above is interposed. The same O-ring 6B,
A groove 52 for interposing the 6C between the bearings 105A and 105B is formed at the mounting portion of the bearing.

Therefore, according to this embodiment, since a part of the housing on the motor side can be constituted by the housing on the power tool side, the weight can be reduced, for example, by about 10%.

[0019]

As described above, according to the present invention, the magnet on the stator side, in which the rotor constituting a part of the motor is inserted, is fixed to the cylindrical portion made of a conductive material, and Is attached to the housing part of the power tool made of insulating material via a vibration isolating member, the brush holder forming a part of the motor is directly attached to the housing part, and the motor components are Since it is configured to be assembled, a part of the housing on the motor side can be constituted by the housing on the power tool side.

Further, according to the present invention, the cylindrical body also serves as an iron frame. However, the cylindrical body is formed in a relatively narrow cylindrical shape having left and right openings by removing unnecessary portions. Since the iron frame is formed with the minimum width necessary for the magnetic circuit configuration, the number of parts can be reduced by that much, which is economical and can reduce the number of manufacturing steps.
It is suitable for realizing miniaturization (slimming).

Further, according to the present invention, a part of the housing on the motor side can be constituted by the housing on the power tool side, and it is not necessary to constitute a composite structure as in the prior art. Since the fixed portion of the motor by tightening or the like is eliminated and only the motor is set inside the housing, anyone can easily take out the motor from the housing and easily replace the internal parts.

Further, according to the present invention, from the assembly of the motor to the completion of the power tool, it is possible to efficiently assemble the housing by using the housing of the power tool by a consistent flow operation, thereby reducing the production and cost. be able to.

Further, according to the present invention, the connection of the wiring cord can be performed outside the motor (in the housing of the power tool), so that no special wiring space is required in the motor portion, and the motor is further downsized. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a main part of a motor used in a method for assembling a power tool according to the present invention.

FIG. 2 is a schematic configuration diagram showing a main part of a power tool to which the motor is assembled.

FIG. 3 is a main part configuration diagram showing a power tool to which a conventional motor is assembled.

FIG. 4 is a schematic configuration diagram showing a conventional motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Cylindrical body (iron frame) 3 Brush 4 Commutator 5 Housing 5A 5B Half body 6A 6B 6C O-ring (vibration-proof member) 105A 105B Bearing 112 Rotation shaft

Claims (1)

[Claims] 1. A housing part of a power tool in which a stator-side magnet in which a rotor constituting a part of a motor is inserted is fixed to a cylindrical portion formed of a conductive material, and the cylindrical body is formed of an insulating material. A brush holder constituting a part of the motor is directly attached to the housing part, and the motor is assembled using the housing. How to assemble a DC motor driven electric tool.