JPH10136611A - Power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain cost reduction and higher ease of assembly and longer service life by forming a wall for blocking the clearance between a housing and a wiring block at the housing or the wiring block. SOLUTION: Both ends of a rotor 1 are supported by bearings 2 formed in a housing 3, and a cooling fan 7 is fitted on the opposite side of a commutator 6. A stator 4 is disposed at the outer periphery of the rotor 1. The stator 4, wound on stator winding 11 and is press-fixed at a rotor pressing surface formed in the housing 3, and involves a wiring block 5 connected to the stator 4. The winding block 5 is formed with a conical wall 5a, which has such a shape as to block the clearance between the wiring block 5 and the housing 3, when the wiring block 5 is assembled. It is thus possible for cooling air sucked from the suction opening 9 of a tail cover 8 by the cooling fan 7 to cool the commutator 6 with high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power tool having a built-in commutator motor.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional power tool. In the case of a power tool that is heavily loaded, the temperature of the rotor 1 and the stator 4 may rise and burn out. Therefore, as shown in FIG.
The cooling fan 7 is attached to the cooling device, and the cooling air indicated by the arrow is caused to flow to cool the rotor 1 and the stator 4.

[0003]

In the conventional power tool as described above, the cooling air sucked from the suction port 9 of the tail cover 8 hits the wiring block 5 as shown in FIG. 6 and between the wiring block 5 and the housing 3. When the temperature of the commutator 6 rises and burns, the commutator motor does not operate, and the power tool having the above-described configuration has a drawback that the cooling air does not flow efficiently and the life is short. .

As shown in FIG. 5, a conical flow guide 13 is inserted between the tail cover 8 and the housing 3 to solve the above-mentioned drawbacks, so that the cooling air can efficiently flow to the commutator 6. Although there is a tool, there are drawbacks in that the number of parts increases, the cost increases, and the assemblability deteriorates. SUMMARY OF THE INVENTION An object of the present invention is to provide a power tool which can solve the above-mentioned drawbacks, is low in cost, has good assemblability, and can extend the life.

[0005]

The above object is achieved by providing a wall in a housing or a wiring block for blocking a gap between the housing and the wiring block.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power tool according to the present invention will be described below with reference to FIGS. FIG. 1 is an enlarged sectional view of a main part showing an embodiment of the power tool of the present invention, and FIG. 2 is an enlarged perspective view of a wiring block shown in FIG. As shown in FIG.
Both ends are supported by bearings 2 provided in a housing 3, and a cooling fan 7 is mounted on the opposite side of the commutator 6. A stator 4 is arranged on the outer periphery of the rotor 1, and the stator 4 is wound around a stator winding 11 and abuts against a stator abutting surface (not shown) provided on the housing 3 and is fixed. Is connected to a wiring block 5. The wiring block 5 has a conical wall 5a as shown in FIG.
The wall 5a is shaped to block a gap between the wiring block 5 and the housing 3 when the wiring block 5 is assembled.

With the above-described configuration of the wiring block 5, most of the cooling air sucked from the suction port 9 of the tail cover 8 by the cooling fan 7 is formed by the conical wall 5 a provided on the wiring block 5. , Between the wiring block 5 and the commutator 6. Therefore, the commutator 6 is efficiently cooled.

In the above embodiment, the wiring block 5
The gap between the wiring block 5 and the housing 3 is blocked by providing a conical wall 5a in the housing 3, but the gap between the wiring block 5 and the housing 3 is blocked by the housing 3 as shown in FIG. The same effect can be obtained even in a case where the configuration is such that the wall 3a is provided.

[0009]

As described above, according to the present invention, the housing or the wiring block is provided with a wall for blocking the gap between the housing and the wiring block. It is possible to provide a power tool that can perform the power tool.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part showing an embodiment of a power tool of the present invention.

FIG. 2 is an enlarged perspective view showing the wiring block of FIG. 1;

FIG. 3 is an enlarged sectional view of a main part showing another embodiment of the power tool of the present invention.

FIG. 4 is an enlarged sectional view of a main part showing an example of a conventional electric tool.

FIG. 5 is an enlarged sectional view of a main part showing an example of a conventional electric tool.

[Explanation of symbols]

1 is a rotor, 3 is a housing, 3a is a wall, 4 is a stator,
5 is a wiring block, 5a is a wall, and 6 is a commutator.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazu Maeda 1060 Takeda, Hitachinaka City, Ibaraki Prefecture Inside Hitachi Koki Co., Ltd.

Claims (1)

[Claims] 1. A power tool containing a commutator motor having a rotor and a stator in a housing, a cooling fan attached to the rotor, and a wiring block connected to the stator. An electric tool, wherein a block is provided on a block to block a gap between a housing and a wiring block.