JPS5814675Y2 - Electric chainsaw motor cooling air discharge device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a motor cooling air discharge device for an electric chainsaw.

A conventional electric chainsaw will be explained with reference to FIGS. 1 to 5.

First, in FIGS. 1 and 2, 1 indicates the main body of the chainsaw.

M indicates an electric motor, and the electric motor M is connected to the housing 11. It consists of a stator 2 and an armature 3 housed in a housing 11.

An inner cover 5, a gear cover 6, and a chain cover 10 whose lower side is open are sequentially superimposed and fixed in openings at both ends of the housing 11.

4 is a cooling fan fixed to the armature 3.

A spindle S is disposed parallel to the axis of the electric motor M and rotatably held by an inner cover 5 and a gear cover 6, and its tip protrudes into the chain cover 10.

A sprocket 9 is fixed to the tip of the spindle S, and a saw chain 8 is stretched between the sprocket 9 and the guide bar 7.

The guide bar 7 is held between the gear cover 6 and the chain cover 10 by a screw 18, and extends forward in a direction perpendicular to the axis of the electric motor M.

At the rear ends of the inner cover 5 and gear cover 6, passages 12 and 12' constituting a cooling air discharge passage 19 are formed, and the cooling air from the electric motor M is discharged to the side of the aircraft body through the passage 19. Ru.

12" indicates the exhaust port. Since electric chainsaws are normally used in the position shown in Figure 3, the sound generated by the exhaust of cooling air not only gives discomfort to the user 13, but also poses safety and health problems. It may become.

FIGS. 4 and 5 show examples in which the noise level near the user's ears is reduced by discharging the cooling air below the user.

In this example, the chain cover 10 is further extended rearward so that the outlet 12'' of the passage 19 faces the rear inner surface of the chain cover 10, and the inner surface of the chain cover 10 directs the cooling air in a downward direction (see Fig. 6). direction of arrow a).

In this method, the chips carried into the chain cover 10 by the chain 8 during wood cutting are discharged together with the cooling air, so not only are the chips excessively scattered around the work area, but the scattered chips are also exposed to the user. It has drawbacks such as getting into people's eyes and mouths.

Furthermore, while cutting wood, transporting or storing the machine, chips inside the chain cover 10 may be leaked from the discharge port 14 to the housing 11.
This has the disadvantage that it can get inside the motor, damage the motor windings, and have a negative effect on the insulation.

The purpose of the present invention is to eliminate the drawbacks of the conventional device described above, to reduce the noise near the ears of a chain saw user, and to prevent excessive scattering of cutting chips.

The present invention will be explained below with reference to the embodiments shown in FIGS. 6 to 8.

In this figure, the same reference numerals as in FIGS. 1 to 5 indicate the same parts.

At the rear of the inner wall of the chain cover 10, a cooling air deflection discharge section 16 at the rear and a chip discharge section 17 at the front are provided.
A partition wall 15 is provided in the vertical direction to divide the cooling air discharge passage 19 into a partition wall 15, and the exhaust port 12'' of the cooling air discharge passage 19 is connected to the cooling air deflection discharge part 16.
is coming.

With the above configuration, the cooling air generated by the cooling fan 4 of the electric motor M passes through the passage 19 and is discharged from the outlet 14 into the cooling air deflection/discharge portion 16 of the chain cover 10.

Since only the lower part of the cooling air deflecting/discharging section 16 is open, the cooling air is deflected downward (in the direction of arrow a in FIG. 6) and is discharged downward from the aircraft body.

According to this invention, the cooling air of the electric motor is discharged downward from the machine body, which not only reduces the noise felt by the user, but also prevents the chips inside the chain cover from being affected by the exhaust air. Since there are no chips, it is possible to prevent excessive scattering of chips, and it is also possible to prevent damage to the motor windings and deterioration of insulation performance due to chips entering the motor housing.

[Brief explanation of drawings]

Figure 1 is a front view showing the appearance of a conventional electric chainsaw.
Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1, Fig. 3 is a side view showing how the electric chainsaw is used, Fig. 4 is a sectional view showing another conventional electric chainsaw, and Fig. 5 is a cross-sectional view showing the electric chainsaw in use. 5 is a rear view of the chain cover in FIG. 4. FIG. FIG. 6 is a front view of an electric chainsaw equipped with the device of the present invention, FIG. 7 is a sectional view taken along the line B--B of FIG. 6, and FIG. 8 is a rear view of the chain cover of the present invention. M is an electric motor, S is a spindle, 4 is a cooling fan, 5 is an inner cover, 6 is a gear cover, 7 is a guide bar, 8 is a saw chain, 9 is a sprocket, 10 is a chain cover, 1
1 is a housing, 14 is a discharge port, 15 is a partition wall, 16 is a cooling air deflection/discharge section, 17 is a chip discharge section, and 19 is a cooling air discharge passage.

Claims (1)

[Scope of utility model registration request] An electric motor, an inner cover, a gear cover, which are sequentially superimposed and fixed to the housing side opening of the electric motor, a chain cover whose lower end is open, and a chain cover which is held by the inner cover and gear cover and arranged parallel to the axis of the electric motor, and whose tip a spindle protruding into the chain cover, a sprocket fixed to the tip of the spindle, a guide bar sandwiched between the inner cover and gear cover and extending in a direction perpendicular to the axis of the motor, and the sprocket and guide bar. In the motor cooling air discharge device for an electric chainsaw, the motor cooling air discharge device for an electric chainsaw includes a saw chain that is hung over the saw chain, the inner cover and the gear cover form a cooling discharge passage for the electric motor, and the cooling air is discharged to the outside of the machine body. The discharge part of the passage is connected with a cooling air deflection discharge part having an open lower end that deflects and discharges the cooling air from the discharge port downward, and the cooling air deflection discharge part is constituted by the chain cover and the gear cover. A motor cooling air discharge device for an electric chainsaw characterized by separating a chip discharge portion from a partition wall.