JP3042112B2 - Starter motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor for a starter of an engine, and more particularly, to an improvement in a connection structure and a holding structure of a terminal of a shunt coil.

[0002]

2. Description of the Related Art Conventionally, in order to prevent mechanical damage (breakage of a pinion gear of a starter, etc.) due to abnormally high speed rotation at no load, an auxiliary part is used in addition to a series wound coil (hereinafter referred to as a field coil). There is a motor for an engine starter using a compound winding type coil provided with a winding coil (hereinafter referred to as a shunt coil).

In this case, as described in JP-B-63-154055, a crossover portion for connecting each field coil and shunt coil is required. In order to ensure reliability, it was necessary to increase rigidity. In particular, since the shunt coil has a smaller cross-sectional area than the field coil, another thick terminal wire is connected, a terminal is further connected, and an electrical connection is made to a brush or the like, and the terminal portion is fixed.

[0004]

However, these methods require a large number of man-hours and the number of parts, have a problem of lack of reliability, and cannot be applied to mass-produced products.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a highly reliable engine starter motor that has a greatly reduced man-hour for connecting and holding a terminal of a shunt coil and has seismic resistance and insulation. The purpose is to:

[0006]

The starter motor of the present invention has a cylindrical yoke in which a plurality of pole cores are arranged on the inner periphery, and a field coil and a shunt coil are arranged on the outer periphery of each pole core. A starter motor for an engine in which an insulator made of a substantially annular insulating resin for holding a terminal portion of the field coil is fitted to an inner peripheral portion of the yoke, wherein the insulator comprises the pole core on an inner peripheral surface of the yoke. Located between
Together have a protrusion of the concave having a space portion in the direction of the yoke, the the bottom of the protrusion are both Ru provided a notch for holding the terminal near the portion of the shunt coil, the space portion of the protrusion
And a fixing member for fixing the shunt coil .

[0007]

According to the above configuration, the terminal portion of the shunt coil is easily held by the insulator with a small number of man-hours, and the earthquake resistance and the insulation are sufficiently ensured.

[0008]

According to the present invention, the space inside the yoke is effectively used, and the shunt coil is held and fixed to the part where the insulator is partially deformed in a concave shape, so that the number of parts is increased without increasing the number of parts. A highly reliable starter motor can be obtained with respect to vibration stress. Also, unlike the conventional case, a special thick terminal wire for securing rigidity is not required, and a thin shunt coil wire can be directly welded to the yoke, so that the man-hour can be greatly reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS.
3 is a cross-sectional view of a main part of FIG. 1, FIG. 4 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 5 is a perspective view of a main part of the insulator. As shown in FIG. 4, the yoke 4 of the star motor is formed in a cylindrical shape by a magnetic material, and has four pole cores 5 mounted therein by welding. The inner peripheral surfaces of the pole core 5 and the yoke 4 are provided with a primary insulating layer 61 such as an epoxy resin.

A shunt coil 3 made of a thin single wire with an insulating film having a small cross-sectional area is wound around the pole core 5, and this shunt coil 3 is wound around four pole cores 5 continuously without being cut. I have. The field coil 1 in which a plurality of wires with an insulating film having a larger cross-sectional area than the shunt coil 3 are bundled is wound around the outer periphery of the shunt coil 3 as shown in FIG.
Are connected to the brush 7 at the terminals 11 and 12, respectively. The other terminals 13 and 14 are connected to a connector bar, and are connected to a battery (not shown) via a lead wire 9.

An insulator 2 made of a substantially annular thermoplastic resin is inserted into the inner periphery of the yoke 4 and caulked at a portion 411 on the spigot portion 41 of the yoke 4 and is fixed to the yoke 4. The insulator 2 is provided with a groove 21 into which the field coil end portions 11, 12, 13, 14 are inserted. The inlet portion 211 holds the coil end portions 11, 12, 13, 14 by heat staking or the like. It has been deformed to the side to do.

After the shunt coil 3 and the field coil 1 are wound, a secondary insulating layer 6 is formed, for example, by energizing and heating the coil itself to melt and adhere the epoxy powder.
2, it is insulated and fixed to the yoke 4 and the pole core 5.

As shown in FIG. 2, the insulator 2 is provided with a projection 22 having a space in the direction of the yoke 4 in the space between the pole cores 5 adjacent to the inner peripheral surface of the yoke 4. As shown in FIG. 5, the projection 22 has a concave shape, and the bottom 221 has a notch 2 through which the shunt coil 3 passes.
A thin projection 223 having 22 is provided. The thin projection 223 has a maximum diameter slightly larger than the inner diameter of the yoke 4, and when assembled to the yoke 5, as shown in FIG. 4, is deformed upward to form a gap between the inner peripheral surface of the yoke 4 and the insulator 2. Is filled, and a tub-shaped space is formed by the protrusion 22 and the inner peripheral surface of the yoke 4.

Beginning of winding of shunt coil 3 Terminal part 31
Is pulled out from the yoke 4 through the notch 222 of the protrusion 22 of the insulator 2, and the inner peripheral surface of the yoke 4 and the protrusion 22
Is welded to the spigot portion 41 of the yoke 4 and grounded.

End 32 of winding end of shunt coil 3
3, is pulled out from the projection 23 of the insulator 2 similar to the projection 22, is welded to the connector bar 8, and is connected to a battery (not shown) via the lead wire 9.

After being assembled as described above, the protrusion 2
The space portions 2 and 23 are filled with, for example, a synthetic resin that is set to be semi-elastic by ultraviolet rays, and the shunt coil 3 is elastically fixed.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the embodiment shown in FIG. 1;

FIG. 3 is a sectional view of a main part of the embodiment shown in FIG. 1;

FIG. 4 is a sectional view taken along the line AA of FIG. 1;

FIG. 5 is an essential part perspective view showing a protrusion of the insulator in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Field coil 2 Insulator 22, 23 Projection part 221 Bottom part 222 Notch 223 Projection 3 Shunt coil 31 Winding start terminal part 32 Winding end terminal part 4 Yoke 5 Pole core 7 Brush 8 Connector bar 9 Lead wire

Claims (3)

(57) [Claims] 1. A plurality of pole cores are arranged on an inner peripheral portion,
A cylindrical yoke in which a field coil and a shunt coil are arranged on the outer periphery of each pole core is provided, and an insulator made of a substantially annular insulating resin that holds a terminal portion of the field coil is fitted to an inner peripheral portion of the yoke. In the starter motor for an engine, the insulator is located between the pole cores on the inner peripheral surface of the yoke and has a space in the direction of the yoke.
Had a concave protrusion, both Ru provided a notch for holding the terminal near the portion of the shunt coil in the bottom of the protrusion,
Fixing the shunt coil in the space of the projection
A starter motor having a fixed member . 2. A thin projection having a maximum diameter slightly larger than an inner diameter of the yoke and having elasticity at a bottom portion of the projection, and the notch is formed in the thin projection. The starter motor according to claim 1. 3. The space member is filled with the fixing member.
The starter motor according to claim 1, wherein the starter motor is a semi-elastic resin.