JPH06335874A - Block coupling type motor-driven tool - Google Patents

Abstract

PURPOSE:To assemble a motor-driven tool by coupling blocks with each other. CONSTITUTION:A motor-driven tool is divided into a mechanical block Me, motor block Mo and rear block R. A conductive piece is fixed to the motor block Mo to connect an end of a field coil F and a brush holders Bh1, Bh2 thereto. Another conductive piece is fixed to the rear block to interconnect the other end of the field coil F and a power supply (or power switch). Respective block housings are provided with a guide hole through which the conductive piece passes so that the wiring is completed by through the conductive pieces by coupling the blocks with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable power tool, and more particularly to a power tool capable of remarkably simplifying assembly work.

[0002]

2. Description of the Related Art A technique has been proposed in which a conductor piece is fixed to a motor housing, and a field subassembly is inserted and fixed in the motor housing to complete electrical connection between a field coil and a brush. JP 59-1
It is disclosed in Japanese Patent No. 85142. A technique of plug-in connection of a brush holder assembly to complete motor wiring is disclosed in Japanese Utility Model Publication No. 59-155857.

[0003]

According to the former technique,
Although the electrical connection between the field coil and the brush is easily completed, the lead wire is used to connect the field coil and the power cord or the field coil and the switch, and the wiring is completed using the lead wire. Later, the rear cover is fixed and the wiring is housed in the housing. For this reason, this work is still troublesome and difficult to automate, which is an obstacle to labor saving in assembly work. According to the latter technique, the brush holder assembly must be created separately from the housing of the electric tool, and the brush holder assembly must be attached and then covered with the housing, increasing the number of parts and increasing the assembly process. Still not simplified. INDUSTRIAL APPLICABILITY The present invention effectively utilizes a rear block housing which is a rear housing of an electric power tool, and thus makes it possible to perform both the step for completing the motor wiring and the step for assembling the electric power tool, thereby reducing the number of parts. The purpose is to simplify the assembly process.

[0004]

Therefore, in the present invention, an electric power tool having a motor block and a rear block assembled and assembled and having the following constitution was created. That is, the motor block has a field coil block and a rotor built into the motor block housing that also serves as the housing of the electric tool, and a brush holder can be attached to the motor block housing.The rear block is the rear housing of the electric tool. The switch is built in the rear block housing that also serves as. The rear block housing has one end fixed to the motor block coupling side and the other end fixed to a conductor piece connected to the switch or the power cord. A conductor piece having one end connected to the terminal of the field coil block when the field coil block is housed and the other end connected to the brush holder is fixed to the motor block housing. The motor wiring is completed when the field coil block is housed in the motor block housing and coupled to the rear block.

[0005]

According to the electric tool having this structure, when the field coil block is housed in the motor block housing and coupled to the rear block, not only between the field coil and the brush but also between the field coil and the power cord and the field magnet. The wiring between the coil and the switch is completed and the motor wiring is completed. The housing of each block becomes the housing of the electric tool as it is, and the housing is completed by connecting the blocks. Thus, according to the present invention, the power tool is assembled by connecting the blocks, and the assembling work is simplified. It also enables automation of assembly work.

[0006]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 schematically shows the power tool according to this embodiment centering on the relationship between its wiring and blocks, and FIG. 2 schematically shows the overall layout relationship.
Note that FIG. 2 is a schematic diagram, and the exact shape is shown after FIG. As is apparent from FIGS. 1 and 2, this electric tool is assembled by assembling a mechanical block Me, a motor block Mo, and a rear block R. Mecha Block Me
Is a mechanical block housing (which is a front housing of an electric tool) Meh, which incorporates a tool drive mechanism T (in this case, reduction gear train T) and a tool shaft S.
A tool is attached to. Conventional techniques can be applied to this portion, and various electric tools such as a drill, a sander, a jigsaw, and a reciprocating saw can be obtained by changing the type of the mechanical block.

The motor block Mo contains a field coil block F and a rotor A in a motor block housing (which serves as a sensor housing of an electric tool) Moh, and a brush holder is attached to the motor block housing Moh. In this embodiment, a pair of brush holders Bh1 and Bh2 are attached (see FIG. 1).
In this case, the brush holders Bh1 and Bh2 are not shown and only the brushes B1 and B2 are shown, while the brushes B1 and B2 are not shown in FIG. ). As is well known, the brushes B1 and B2 are the brush holders Bh1 and Bh2.
It is housed in a state of being electrically connected to and contacts the commutator A2 of the rotor A.

The field coil block F is formed by winding a pair of field coils FC1 and FC2 around an iron core FC, and a total of four terminals of a pair of coils are provided on the terminal board FD. It is connected to two female terminals F1, F3, F4 and F5. The terminals of the field coil FC1 are connected to F1 and F3, and the terminals of the field coil FC2 are connected to F4 and F5. The outer periphery of the field coil block F is exposed with the iron core FC so that it can be electrically connected from the outside. In FIG. 2, reference numerals 54 and 58 are through holes for fixing the field coil block F. The rotor A has a rotor axis AS,
When the rotor shaft AS is inserted into the mechanical block Me, the rotor shaft AS is linked with the gear train T so that torque can be transmitted.

The motor block housing Moh of the motor block Mo is formed of an insulating plastic into a substantially cylindrical shape, and has grooves for fixing the three conductor pieces 4, 6 and 8 formed in the inner wall portion. As shown in FIGS. 2 and 9, the conductor piece 4 extends axially, one end 4a extends into the motor block housing Moh, and the other end 4b is fixed at a position protruding toward the rear block R side. Has been done. The one end 4a has a positional relationship in which it contacts the outer circumference of the iron core FC of the field coil block F, and this contact point is designated as F2 in FIGS. 1 and 2. The two conductor pieces 6 and 8 are fixed to the housing Moh in the vicinity of the mounting portions of the brush holders Bh1 and Bh2, one ends 6a and 8a extend into the motor block housing Moh, and the other ends 6b and 8b (which are female terminals). Is fixed at a position adjacent to the brush holder mounting portion. One end 6a of the conductor piece 6 is located corresponding to the F3 terminal, and one end 8a of the conductor piece 8 is located corresponding to the F4 terminal. A guide hole W2 is axially formed at a position corresponding to the terminal F1 of the motor block housing Moh, and a guide hole W3 is axially formed at a position corresponding to the terminal F5. These guide holes W2 and W3 are also formed in the inner wall portion of the motor block housing Moh.

Since the conductor pieces 4, 6 and 8 are fixed to the motor block housing Moh and the field coil block F is then inserted because of the above-mentioned structure, one end 6a of the conductor piece 6 is attached to the female terminal F3. Inserted, female terminal F4
One end 8a of the conductor piece 8 is inserted in the field coil block F, one end 4a of the conductor piece 4 is in contact with the iron core FC of the field coil block F, and the guide hole W2 is located at the corresponding female terminal F1.
The guide hole W3 is located at the position corresponding to 5. In this state, bolts are passed through the two through holes 54 and 58 formed in the field coil block F, and the bolts are screwed into the screw holes 43 and 45 (see FIG. 10) of the motor block housing Moh. The field coil block F is fixed while being housed in the motor block housing Moh. Note that reference numerals 44, 46, 48, and 50 in FIG. 10 are screw holes for screws that integrate the mechanical block housing Meh and the motor block housing Moh, and by this, the front housing and the center housing of the electric power tool are coupled.

Further, as shown in FIG. 2, when the brush holders Bh1 and Bh2 are attached at predetermined positions, the male terminals Bh1 extending from the brush holders Bh1 and Bh2.
a, Bh2a are inserted into the female terminal 6b of the conductor piece 6 and the female terminal 8b of the conductor piece 8, and the field coils FC1, FC2
And the brush holders Bh1 and Bh2 are connected. The brush holders Bh1 and Bh2 are fixed by being sandwiched between a rear block housing Rh and a motor block housing Moh, which will be described later.

After that, when the rotor A is inserted and the mechanical block Me and the motor block Mo are further coupled, the rotor shaft AS of the rotor A is linked with the gear train T so that torque can be transmitted. The rear end of the rotor shaft AS of the rotor A is supported by a bearing mounted on the bearing box 35 (see FIG. 10). Bearing box 35 has four ribs 3
8, 36, 42 and 40 are integrally formed with the motor block housing Moh.

11 to 13 show three-sided views of the conductor piece 6, in which 6c is a retaining piece. When the conductor piece 6 is inserted into the groove of the motor block housing Moh, the retaining piece 6c prevents the conductor piece 6 from coming out of the groove. The conductor piece 8 is also exactly the same as the conductor piece 6. Although details of the conductor piece 4 are not shown in the drawings, when the conductor piece 4 is inserted into the guide groove and positioned, the retainer piece prevents the conductor piece 4 from coming off.

Next, the rear block R will be described with reference to FIGS. This rear block R is a half type rear block housing Rh as shown in FIG.
1 and Rh2, the switch SW and the capacitor 12 are fixed in a half-divided housing Rh1 (see FIG. 3). The rear block housings Rh1 and Rh2 are combined to form a rear housing for an electric power tool. The switch SW can be operated from the outside. Two conductor pieces 2 and 10 are fixed to the end of the rear block R on the motor block Mo side. The conductor pieces 2 and 10 have the same shape,
The detailed shape is shown in FIGS. 6 and 7. The conductor pieces 2 and 10 are long as a whole, and one end thereof has male terminals 2a, 10
a, and the other ends are crimp terminals 2b and 10b. The retaining pieces 2c, 2d, 10c, 10d are formed in the central portion.

The conductor pieces 2 and 10 are inserted and fixed in a groove formed in the inner wall of the rear block housing Rh1, and when inserted in the groove, the retaining pieces 2c, 2d, 10 are provided.
It cannot be removed by c and 10d. The male terminals 2a and 10a of the conductor pieces 2 and 10 are fixed in a state of protruding toward the motor block Mo side. A guide hole W1 is formed on the motor block Mo side of the rear block housing Rh1, and a female terminal R2 is fixed therein (see FIGS. 3 and 4).

The conductor piece 2 is a motor block housing M.
The conductor piece 10 is located at a position corresponding to the guide hole W2 of oh and the female terminal F1 of the field coil block F, and the conductor piece 10 has the guide hole W3 of the motor block housing Moh and the field coil block F.
It is located corresponding to the female terminal F5. Further, the female terminal R2 and the guide hole W1 of the rear block R are positioned corresponding to the male terminal 4b of the conductor piece 4 of the motor block Mo.

As shown in FIG. 3, the power cord C
The end portion of the one wire 14 is crimped to the crimp terminal 2b of the conductor piece 2. The end of the other line 18 of the power cord C is connected to one terminal of the switch SW. Capacitor 1
2 is three capacitors 12a-c as shown in FIG.
Is connected to the three lead wires 16, 24, 22. As shown in FIG. 3, the lead wire 16 is crimped to the crimp terminal 2b of the conductor piece 2, the lead wire 24 is connected to the female terminal R2, and the lead wire 22 is connected to the other terminal of the switch SW. There is. A lead wire 20 connects between the other terminal of the switch SW and the crimp terminal 10b of the conductor piece 10. After the state of FIG. 3 is completed, the half housings Rh1 and Rh2 are integrated. In FIG. 3, reference numerals 26 and 28 are screw holes for integrating the screws.

After the rear block R is completed, the rear block R is connected to the motor block Mo. Then, as well shown in FIG. 2, the male terminal 2a of the conductor piece 2 is
Is inserted into the F1 terminal of the field coil block F through the guide hole W2 of the motor block housing Moh. In addition, the male terminal 10a of the conductor piece 10 penetrates the guide hole W3 of the motor block Mo and passes through the field coil block F.
Of the female terminal F5. Further, the male terminal 4b of the conductor piece 4 of the motor block Mo penetrates the guide hole W1 of the rear block R and is inserted into the female terminal R2.

By the above, the motor wiring shown in FIG. 1 is completed. After that, screw the screw that penetrates the rear block R in the axial direction from the rear end of the rear block R to the motor block Mo.
The rear block R is fixed to the motor block Mo by being screwed into the screw holes 32 and 34 (see FIG. 8). As a result, the rear housing is joined to the center housing of the power tool, and the power tool housing is completed. The electric tool is completed through the above steps. The mechanical block Me may be connected to the motor block Mo first, or the rear block R may be connected first.

According to this embodiment, by connecting the blocks, not only the motor wiring but also the noise prevention circuit is completed. Further, in this embodiment, the forward / reverse changeover switch, the motor speed adjusting circuit and the like are not incorporated in the rear block R, but these switches and circuits may be incorporated in the rear block R as required. When these switches and circuits are incorporated, the ends 2b and 10b of the conductor pieces 2 and 10 are connected to the power supply line and the power supply switch through these switches and circuits. The power source is not limited to the commercial power source, and a battery pack may be used as the power source. When using the battery pack, the battery pack may be housed in the rear block R. The power cord in this case does not necessarily need to be flexible, and may be a conductor piece. Others The present invention can be embodied in various modes.

[0021]

According to the present invention, the wiring of the motor is completed by connecting the blocks, and the housing of the electric tool is also completed, so that the assembling work of the electric tool can be remarkably simplified and can be automated. Therefore, the manufacturing cost of the electric tool is reduced, and the labor of assembling work can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a wiring relationship and a block relationship according to an embodiment.

FIG. 2 is a diagram schematically showing the overall configuration of the power tool of the embodiment.

FIG. 3 is a diagram showing the inside of a rear block R (view seen from the direction III in FIG. 2).

FIG. 4 is a view of one of the rear block housings Rh, Rh1, viewed from the IV direction in FIG.

FIG. 5 is a view of the rear block R before being combined, viewed from the direction V in FIG.

FIG. 6 is a side view of the conductor piece 2 (10).

FIG. 7 is a front view of the conductor piece 2 (10).

8 is a view of the motor block Mo seen from the direction VIII in FIG.

FIG. 9 is a side view (a part of which is a cross-sectional view) of the motor block Mo, but before the brush holder Bh1 is attached and after the brush holder Bh2 is attached.

10 is a view of the motor block Mo seen from the X direction in FIG. 2;

FIG. 11 is a front view of the conductor piece 6.

FIG. 12 is a side view of the conductor piece 6.

FIG. 13 is a plan view of the conductor piece 6.

[Explanation of symbols]

 Me: Mechanical block Meh: Mechanical block housing T: Tool driving mechanism Mo: Motor block housing Moh: Motor block housing F: Field coil block A: Rotor Bh1, Bh2: Brush holder R: Rear block Rh1, Rh2: Housing SW: Switch 12: Capacitor 2, 4, 6, 8, 10: Conductor piece

Claims (1)

[Claims] 1. A power tool assembled by assembling a motor block and a rear block, wherein the motor block has a field coil block and a rotor built in a motor block housing that also serves as a housing of the power tool. A brush holder can be attached to the motor block housing, and the rear block has a switch built in the rear block housing that also serves as the rear housing of the electric tool. One end of the rear block housing projects toward the motor block coupling side. , A conductor piece having the other end connected to the switch or the power cord is fixed, and one end connected to a terminal of the field coil block when the field coil block is accommodated in the motor block housing. And the other end connected to the brush holder. That the conductor piece is fixed, the block combiner power tool, characterized in that the in the motor block housing accommodating the field coil block coupled to said rear block motor wiring is completed.