JPH06231987A - Adhesion of coil in coil device - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the adhesive force between the bobbin and the adhesive with which the coil is impregnated in the coil device for an AC generator. [Structure] Coil winding portion 8a of bobbin 8 of coil device 6
Perform shot blasting on. [Effect] The adhesive force between the adhesive impregnated in the coil and the bobbin is improved, and the bobbin and the adhesive are peeled off, and play and coil breakage are prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil fixing method for a coil device for an AC generator, which is an engine electric component such as a two-wheeled vehicle, a snowmobile, an outboard motor and the like.

[0002]

2. Description of the Related Art FIG. 6 is a schematic view showing a conventional AC generator. In the figure, reference numeral 1 is an AC generator housed in a crankcase 2 by a crankcase cover 3, and a rotor assembly 5 mounted on a crankshaft 4. And a stator assembly (coil device) 6 attached to the crankcase cover 3.

FIG. 7 is a sectional view showing the coil device 6 of FIG.
FIG. 8 is a view of FIG. 7 seen from the right side, and in the figure, 7 is a core, around which a coil 9 is wound by a bobbin 8. After the coil 9 is wound around the bobbin 8, the coil 9 is fixed to each other and the coil 9 and the bobbin 8 are fixed by impregnating the coil 9 with an adhesive. In addition, 10 is a terminal, 1
Reference numeral 1 is a mounting hole.

[0004]

The conventional coil device has the following problems.
Since it is attached to the crankcase 2 and the crankcase cover 3 as described above, it receives a strong vibration from the engine. Due to this vibration (in the direction indicated by the arrow 12), the bobbin 8 and the adhesive are peeled off to cause backlash and the like, which causes disconnection of the coil 9.

The present invention has been made to solve the above-mentioned problems, and the shot blasting treatment is applied to the coil winding portion of the bobbin to improve the fixing force between the bobbin and the adhesive, thereby removing the coil from the backlash. An object of the present invention is to obtain a coil fixing method for a coil device that can prevent coil breakage and the like.

[0006]

A coil fixing method for a coil device according to the present invention is to perform shot blasting treatment on a coil winding portion of a bobbin.

[0007]

In the present invention, the shot blasting treatment improves the adhesion between the bobbin and the adhesive.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view of a coil device showing a state before a shot blast treatment is applied to a bobbin, FIG. 2 is a partially enlarged view showing a state after the treatment of FIG. 1, and FIG. FIG. 4 is a cross-sectional view and FIG. 4 is an enlarged view of a portion of FIG. In the figure, 13
Is a shot blast nozzle, 14 is a shot blasting surface applied to the coil winding portion (bottom surface and both side surfaces) 8a of the bobbin 8, and 15 is a coil fixing adhesive.

As shown in FIG. 1, shot blast processing is performed on the coil winding portion 8a of the bobbin 8 by the shot blast nozzle 13. In this way, when the shot blasting is performed by applying a powder of iron powder or the like to the coil winding portion 8a by using the force of air or the like to perform the shot blasting treatment, the entire surface (bottom surface and both side surfaces) of the coil winding portion 8a is ironed. The powder collides with each other to form fine irregularities, and a shot blasting surface 14 is formed as shown in FIG. The irregularities on the shot-blasted surface 14 are very fine irregularities. The capillary phenomenon in which a liquid travels through a thin pipe is generally known, and for the same reason as this, it is also known that a liquid travels through a fine crack (for example, a thin crack in a concrete wall). The unevenness of the shot-blasted surface 14 is, so to speak, an aggregate of these fine cracks.

Then, as shown in FIGS. 3 and 4, the bobbin 8
When the coil 9 is wound around the coil 9 and the adhesive 15 is impregnated in the coil 9 and the coil 9 is fixed to the bobbin 8, the adhesive 15 permeates to the inside of the concave portion of the shot blasting surface 14, so that the adhesive area becomes uneven due to unevenness. While expanding, wedge effect and anti-slip effect are obtained, and the adhesive force against vibration (direction indicated by arrow 12) is increased.

Embodiment 2. Although the shot blasting treatment is performed on the entire surface of the coil winding portion 8a of the bobbin 8 in the first embodiment, the shot blasting treatment may be performed only on the bottom surface or only the side surface of the coil winding portion 8a.

Embodiment 3. In the first embodiment, the work (coil device 6) is fixed and shot blasting is performed. However, the shot blast nozzle 13 is fixed and the work (coil device 6) is rotated, or a carrier is used. Shot blasting may be applied to the entire work by moving it.

Embodiment 4. Although the coil device 6 for eight poles is shown in the first embodiment, it may have eight poles or more. Alternatively, the coil device 6A as shown in FIG. 5 may be used.

[0014]

As described above, according to the present invention, the effect of improving the fixing force between the bobbin and the adhesive to prevent the bobbin from peeling off from the adhesive, backlash, and coil breakage can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention before processing.

FIG. 2 is a partially enlarged view showing a state after the process of FIG.

FIG. 3 is a cross-sectional view that has been processed.

FIG. 4 is a partially enlarged view of FIG.

FIG. 5 is a sectional view showing Embodiment 4 of the present invention.

FIG. 6 is a schematic diagram showing a conventional AC generator.

7 is a cross-sectional view showing the coil device of FIG.

FIG. 8 is a diagram of FIG. 7 viewed from the right.

[Explanation of symbols]

 2 crankcase 3 crankcase cover 4 crankshaft 5 rotor assembly 6 coil device 7 core 8 bobbin 8a coil winding part 9 coil 13 shot blast nozzle 14 shot blasting surface 15 adhesive

Claims (1)

[Claims] 1. A coil device comprising a core that passes a magnetic flux, a coil that generates electric power, and a bobbin that insulates the core from the coil, and wherein the coil is impregnated with an adhesive for fixing the coil. A coil fixing method for a coil device, comprising performing shot blasting treatment on a coil winding portion of a bobbin.