JPH11309682A - Hammering tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily discharge the dust heaped in a housing by providing a dust discharge port in the housing positioned at a side opposite to a fan in a motor in a direction, in which the gravity is applied when a hammering tool is operated. SOLUTION: A dust discharge port 2e is formed in a matching part 2d of a housing 2 positioned in rear of a motor while crossing the axial direction of a tip tool. With this structure, in the case of using a hammering tool, the dust can be discharged from the dust discharge port 2c by the vibration to be generated by hammering. In a case where the hammering tool is not used, when the hammering tool is directed upward, the dust can be discharged from the dust discharge port 2c by the dead weight of the dust itself. At this stage, the dust to be sucked by a fan is a fine and easily discharged from the dust discharge port 2c. Since the dead weight of the dust is larger than the force to be given by a little quantity of the air sucked from the dust discharge port 2c, the dust is fallen onto the dust discharge port 2c side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a striking tool such as a cordless hammer drill.

[0002]

2. Description of the Related Art In a housing of a striking tool, a striking transmission mechanism for applying a striking force to a tip tool by converting the rotational force of a motor having a cooling fan into a striking force by a reciprocating motion converting mechanism, and a cylinder. And a rotation transmitting mechanism for applying a rotational force to the tool bit by rotating the tool. In addition, a suction window and a discharge window, which are a suction port and a discharge port, are formed in the housing, and the motor is cooled by air sucked into the housing from the suction wind window by rotation of a cooling fan provided in a rotor of the motor. After that, the air is discharged from the discharge window to the outside of the housing.

A normal DC motor having a motor case is housed in a housing, and a rotor, a magnet, a carbon brush holder and the like are arranged in the motor case.

[0004]

When drilling work in concrete using the above-mentioned impact tool, a large amount of dust is generated. In such a drilling operation, particularly when a drilling operation is performed on a ceiling or the like, dust falls around the suction air window formed in the housing, and the suction force generated by the rotation of the fan causes the housing to move from the suction air window to the housing. Dust was inhaled with air inside. Since the dust accumulates in the housing without being discharged out of the housing, the dust gradually penetrates into the motor case, and accumulates in the motor bearing and the periphery of the carbon brush. As a result, the dust concentration in the housing gradually increases, and there is a problem that the accuracy of these components is significantly reduced.

An object of the present invention is to solve the above-mentioned problem and to provide a striking tool capable of easily discharging dust accumulated in a housing of the striking tool out of the housing.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a motor provided with a fan provided on a rotor of the motor, a discharge port for discharging air generated by rotation of the fan, and a suction port provided on the opposite side of the fan. This is achieved by providing a dust discharge port in a housing portion of the impact tool opposite to the fan side of the motor and located in the direction of gravity when the impact tool is operating.

[0007]

FIG. 1 shows a striking tool according to this embodiment.
This will be described with reference to FIG. FIG. 1 is a side view showing an embodiment of the impact tool according to the present embodiment, FIG. 2 is a partial side view showing an embodiment of the impact tool according to the present embodiment, and FIG. FIG.

[0008] The impact tool shown in FIG.
The impact transmission mechanism for converting the rotational force of the DC motor 1 (hereinafter referred to as a motor) having a motor 6 into a striking force by a reciprocating motion converting mechanism to apply a striking force to the tool bit 9, and rotating the cylinder 8 to rotate the tip 8 A rotation transmitting mechanism for applying a rotational force to the tool 9. Here, the cooling fan 16 is provided for sucking air (outside air) required for cooling the motor 1 into the housing 2.

The striking transmission mechanism is spline-engaged with the intermediate shaft 5 to which the rotational force of the motor 1 is transmitted.
A reciprocating motion conversion mechanism that converts the rotational force of the motor 1 into reciprocating motion of the piston 12 by engaging a clutch 10 that can move upward and a reciprocating bearing 11 rotatably engaged on the intermediate shaft 5. And a striker 15 that slides in the axial direction of the cylinder 8 through the air chamber 13 by reciprocation of the piston 12, and a meson that is struck by the striker 15 and applies a striking force to the tip tool 9. .

The rotation transmitting mechanism includes a first gear mechanism including a pinion 3 and a gear 4 for transmitting the rotational force of the motor 1 as a driving source, an intermediate shaft 5 rotated by the first gear mechanism, and A second gear mechanism including a second pinion 6 and a second gear 7 rotated by the intermediate shaft 5, and a housing 2 rotated by the second gear mechanism and
It is constituted by a cylinder 8 rotatably supported inside.

As shown in FIG. 2, the housing 2, which houses the motor 1, the rotation transmission mechanism, and the impact transmission mechanism, has a suction window 2a and a discharge window, which are a suction port and a discharge port, respectively. 2b is formed. The suction air window 2a is for sucking air required for cooling the motor 1 into the housing 2, and the discharge air window 2b is for discharging the cooled air out of the housing 2. Further, as shown in FIG. 3, a dust discharge port 2c having a width of 1 mm and a length of 10 mm is formed in the mating portion 2d of the housing 2 which is orthogonal to the axial direction of the tool bit 9 and located at the rear end of the motor 1. ing. In the housing 2, the rotor 1a, the magnet 1b,
The carbon brush plates 1c are individually arranged.

Next, a method of discharging dust accumulated in the housing 2 will be described. Turn on the switch 14 of the impact tool
By doing so, the motor 1 supplied with power is driven to rotate, whereby the fan 16 provided in the motor 1 is rotated. Due to the rotation of the fan 16, the housing 2
Air for cooling the motor 1 is drawn in from the suction wind window 2a, and the cooled air is discharged out of the housing 2 from the discharge wind window 2b. However, in particular, during a drilling operation on a ceiling or the like in which the impact tool is used upward, dust generated during drilling is sucked into the housing 2 together with air from the suction wind window 2a, so that dust accumulates in the housing 2. But
As described above, the dust discharge port 2c is formed in the mating portion 2d of the housing 2 which is orthogonal to the axial direction of the tip tool 9 and is located at the rear end of the motor 1, so that when the impact tool is used, the dust is generated at the time of impact. The dust can be discharged from the dust discharge port 2c by the vibration, and when the impact tool is not used, the dust can be discharged from the dust discharge port 2c by the weight of the dust itself by turning the impact tool upward. Here, the dust sucked by the fan 16 is fine and can be easily discharged from the dust outlet 2c. Because of its own weight, the dust falls to the dust outlet 2c side.

Note that the rotor 1 is provided in the housing 2 of the impact tool shown in this embodiment without using a motor case.
a, the magnet 1b, and the carbon brush plate 1c are individually arranged, so that most of the dust to be attached to the motor 1 can be stored in the vicinity of the dust discharge port 2c without the dust being collected in the motor case. Therefore, dust in the housing 2 can be reliably discharged.

As described above, since the dust in the housing 2 can be easily discharged to the outside of the housing 2 with a simple structure, the accumulation of the dust around the motor 1 can be reduced. Excessive increase in the dust concentration in the motor can be prevented, and the precision of components such as a motor bearing is not reduced, so that the life of these components can be improved.

[0015]

According to the present invention, a dust discharge port is provided in a housing portion on the side opposite to the fan of the motor, which is located in the direction of gravity when the impact tool is operating, thereby accumulating dust in the housing. Dust can be easily discharged, and the life of a motor bearing or the like can be extended.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a striking tool according to the present invention.

FIG. 2 is a partial side view showing one embodiment of the impact tool according to the present invention.

FIG. 3 is a view seen from an arrow A in FIG. 1;

[Explanation of symbols]

1 is a motor, 2 is a housing, 2a is a suction wind window, 2b is a discharge wind window, 2c is a dust discharge port, 2d is a mating part, 9 is a tip tool, and 16 is a cooling fan.

Claims (2)

[Claims] 1. A striking tool comprising a fan provided on a rotor of a motor, an outlet for discharging air generated by rotation of the fan, and a suction port provided around a side opposite to the fan, wherein A dusting tool, wherein a dust discharge port is provided in a housing portion which is located on an anti-fan side and is located in a direction of gravity when the driving tool is operated. 2. The impact tool according to claim 1, wherein the dust discharge port is provided at a joint portion of the housing orthogonal to an axial direction of the tool bit.