JPS58141658A - Manufacture of field unit for starting motor - Google Patents

Abstract

PURPOSE:To eliminate influences of external vibration, mud, water to a starting motor by press-fitting a field permanent magnet into a mounting elastic case. CONSTITUTION:A cylindrical yoke 5 is projected by pressing at four positions, and mounting cases 6 are press-fitted to the projecting flat and side surfaces 5a, 5b. Thereafter, insulating resin 7 to become buffer member is coated on the intermediate between the surface 5a of the yoke 5 and the case 6 and on the outer peiphery of the surface 5a. Subsequently, permanent magnets 8 are press- fitted to the cases 6, and the upper ends of the magnets 8 are press-bonded to the resin 7, thereby impregnating insulating resin 9 to the inner periphery of the yoke 5, i.e., the side surface 5b, the cases 6 and the magnets 8. The resin 9 which is impregnated to the surface which is opposed to an armature core 3 of the magnets 8 is removed to complete the manufacturing steps.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention C relates to an improvement in a method for manufacturing a field device for a starting 1IEtjh machine, and particularly to a method using permanent magnets in the field device.

In cases where conventional permanent magnets are used in the field device of the starting motor, the method of fixing the permanent magnets to the casing of the starting motor is to screw the mounting screws directly onto the permanent magnets. Something that is fixed to, or.

A permanent magnet is indirectly fixed to the housing via a magnetic pole piece,
Furthermore, various methods have been proposed in which a permanent magnet is attached to a housing using an adhesive. However, with either method, there are problems such as damage to the permanent magnet during fixing, poor fixing workability, and insufficient fixing force.

Moreover, the starting motor is installed close to the engine,
Furthermore, since it is installed in automobiles, etc., it is constantly subjected to vibrations and is subject to intrusion of mud, water, dust, etc., so sufficient consideration must be given to environmental resistance.

Jin's invention was made in consideration of the above points.

It is an object of the present invention to provide a method for manufacturing an excellent starting electric field device as described below.

An embodiment of the invention shown in one drawing will be described below.

That is, in Figures 1 and 2, (l) is the maI armature of the starting motor, and (l) is the rotating shaft of this armature.

(3) is an armature core attached to this rotating shaft, and (4) is a rear bracket that rotatably supports the rotating shaft (2).

(6) is a cylindrical yoke that is a casing that is integrally fitted with this yoke, and (5) is a protrusion that is a mounting flat part that is integrally formed on this yoke by press processing. There are four plane parts provided at equal intervals on the circumference of the yoke (6).(6b) is the protruding side surface of the yoke (5);
6) is an elastic cylindrical mounting case that is fitted onto this protruding side surface, and the inner diameter of this case before mounting is set to be smaller than the outer circumference diameter of the protruding flat part (5a) of the yoke (5). ing. (In July, the protruding flat part (5) of the yoke (5) constitutes a buffer member with an insulating resin applied to the inner peripheral surface, and the mounting case (6) and the yoke (5)
This improves the adhesion with. (8) is a field permanent magnet that faces the armature core (3) in the same radial direction with a small gap, and is press-fitted into the mounting case (6), and is inserted through the insulating resin (7). The outer diameter of the permanent magnet (8) is set to be larger than the inner diameter of the mounting case (6) before press-fitting.

(9) is an insulating resin such as epoxy resin, and the permanent magnet (
8), the armature core (excluding the surface facing the 3-ring), the protruding side surface portion (5b) of the yoke (6), the vicinity thereof, and the mounting case (6 months) are impregnated and fixed.

In the embodiment device configured as described above, the manufacturing method thereof is as follows: First, the cylindrical yoke (6) is pressed to project four plow holes to form a projecting plane portion (51) and a projecting side surface (6b). do. Next, these protruding plane parts (protruding side surfaces of 6 passes)
6b), the mounting cases (6) are press-fitted and fixed. After this, the protruding flat part (6a) of the yoke (5) and the mounting case (
6) and on the outer periphery of the protruding plane part (6-). After that, each permanent magnet (il) is press-fitted into the mounting case (6), the upper end of the permanent magnet (8) is crimped to the insulating resin (7), and the yoke (6) is pressed.
An insulating resin (9) is impregnated and fixed to the inner circumference of the magnet, that is, the protruding side surface (sb), the case (6), and the permanent magnet (8). m? The manufacturing process is completed by removing the insulating resin (9) impregnated and fixed on the surface of the permanent magnet (8) facing the armature core (3).

That is, in this method, the field permanent magnet (8
) is press-fitted into the mounting case (6), so the permanent magnet (8) can be attached using the conventional screw tightening method.
Damage to the permanent magnet (8) can be prevented, and since most of the permanent magnet (8) is housed in the resilient mounting case (6),
MIN for the outside has been sufficiently performed.

In addition, even if subjected to vibration, the mounting case (6) and insulating resin (7)
) acts as a buffer member, so vibrations are not directly applied to the permanent magnet (8). Furthermore, in the above embodiment, the attachment case (6) can be attached to the yoke (6) by press fitting into the protruding side surface (5b) of the yoke (6).

The permanent magnet (8) can be attached to the yoke (6) by simply press-fitting the permanent magnet (8) into the attachment case (6), which simplifies the attachment work compared to the conventional method.

Furthermore, since the mounting case (6) and permanent magnet (8) are impregnated and fixed to the inner circumference of the yoke (6) with insulating resin (9), the mounting case (6) and permanent magnet (8) are fixed. Not only can this be done satisfactorily, but it can also be expected to have an a- and book-proofing effect. , In addition, as shown in Fig. 8, the tip (6a) of the mounting case (6)
) is bent inward to prevent the permanent magnet (8) from being removed, and the permanent magnet (8) can be more securely attached.

As described above, in the present invention, a plurality of mounting plane parts are integrally molded by protruding inward at a plurality of places of a cylindrical housing, and a plurality of mounting plane parts are integrally molded at a plurality of places, and a plurality of mounting plane parts are provided on the protruding side surfaces of the mounting plane parts. After fitting, the permanent magnets for the field are press-fitted and fixed in each of the mounting cases, and the press-fitted permanent magnets and the above-mentioned permanent magnets are fitted. −
After integrally impregnating and fixing insulating resin on the mounting plane part of the housing, its vicinity, and the mounting case, the insulating resin impregnated and fixed on the surface of the permanent magnet facing the armature core is removed. Therefore, it may be possible to install the mounting case and the permanent magnet with extremely simple installation work.However, the permanent magnet is press-fitted into the elastic mounting case, and the permanent magnet and the mounting case are Because it is impregnated and fixed with insulating resin, it is protected from external vibrations, mud, water, a
Since it is less susceptible to the effects of dust and the like, it has the advantage of improved environmental resistance and is not damaged when the permanent magnet is fixed to the housing.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing one embodiment of the present invention, Figure 2 is a sectional view taken along the line 1-1 in Figure 1, and Figure 8 is a sectional view showing essential parts of another embodiment of the invention. . In the figure, (1) is the armature, (2) is the rotating shaft, (3) is the armature core, (4) is the rear bracket, (5) is the yoke,
(Sa) is a protruding flat surface, (5b) is a protruding thin surface, (6)
is the mounting case, (6B) is the tip, (7) is the insulating resin, (8) is the permanent magnet, and (9) is the insulating resin. Note that the same line numbers in Figure 1 indicate the same or equivalent parts. Agent Shin Kuzuno −

Claims (1)

[Claims] A plurality of mounting plane parts are integrally molded by protruding inward at a plurality of places of the cylindrical housing, and a tube having elasticity is formed on the protruding thin surface of these mounting plane parts so as to protrude inward from the mounting plane part. After that, the permanent magnets for the field are press-fitted into each of the above-mentioned mounting cases, and the press-fitted permanent magnets, the mounting plane part of the above-mentioned housing, the vicinity thereof, and the above-mentioned A field device for a starting motor, characterized in that after each mounting case is impregnated and fixed with insulating resin, the insulating resin impregnated and fixed on the surface of the permanent magnet facing the armature core is removed. Production method.