JPH07167164A - Manufacture of stator-housing of electromagnetic clutch - Google Patents

Abstract

PURPOSE:To provide a manufacturing method for a low-cost stator housing. CONSTITUTION:In a stator housing 6, the inner and outer peripheral walls 6b and 6c of a housing part 6a are formed by forming recessed parts 9 on the surfaces of the inner and outer peripheral sides of housing raw material formed into a circular, shape and then thinly extending the inner and outer peripheral sides of the housing raw material into a cylindrical state by ironing, being a kind of plastic working. At that time, the recessed parts 9 provided on the surfaces of the housing raw material are formed on the inner surfaces of the inner and outer peripheral walls 6b and 6c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a stator housing of an electromagnetic clutch.

[0002]

2. Description of the Related Art A stator of an electromagnetic clutch comprises an exciting coil wound around a spool and a stator housing for holding the exciting coil, and the exciting coil is housed in an annular housing portion formed in the stator housing. After that, a mold resin is injected and fixed around the exciting coil in the housing. Here, since the one end side of the housing portion of the stator housing is open in the axial direction, it is necessary to prevent the exciting coil from dropping off from the housing portion together with the mold resin.

Therefore, conventionally, a concave portion is provided on the inner peripheral surface of the accommodating portion, and a mold resin is allowed to intervene in the concave portion to regulate the circumferential and axial movements of the mold resin with respect to the stator housing. It is prevented from falling off. The following method has been proposed as a method for providing the recess on the inner peripheral surface of the storage section. A concave portion is formed on the inner peripheral surface of the storage portion by cutting (Japanese Utility Model Publication No. 50-12594, Japanese Utility Model Publication 60-39540).
No., J. Kaikai 62-6540). A recess is formed on the inner peripheral surface of the storage portion by plastic working.
In this case, since the convex portion is formed on the outer peripheral surface of the storage portion by forming the concave portion by plastic working, the convex portion is removed by cutting after forming the concave portion.

In addition to the above-mentioned method, during the mold clamping step of injecting the molding resin into the housing, the caulking portion is formed at the open end of the housing by the caulking punch attached to the upper mold. A method has been proposed in which the caulking portion holds the spool stored in the storage portion to prevent the exciting coil from falling off (see Japanese Patent Publication No. 4-31484).

[0005]

However, in the above method, it is more difficult to cut the inner peripheral surface of the housing portion than in the case of cutting on a flat surface, resulting in a high cost.
In addition, the method (1) requires a cutting process in addition to the plastic working, and thus the cost is high. In addition, the method of
Since the additional caulking step and the replacement of the caulking punch are required, the cost is also high. The present invention is
The present invention has been made based on the above circumstances, and an object thereof is to provide a low-cost manufacturing method of a stator housing.

[0006]

In order to achieve the above-mentioned object, the present invention has an exciting coil formed by winding a coil wire in an annular shape, and an accommodating portion for accommodating the exciting coil. A stator housing in which a concave portion is provided on the inner surface of the annular inner peripheral wall or outer peripheral wall to be formed, and after the exciting coil is housed in the housing portion, the exciting coil is formed by the mold resin injected into the housing portion. In a fixed electromagnetic clutch stator, the stator housing is formed by forming a housing material for manufacturing the stator housing into an annular shape, and then forming an inner peripheral side and an outer peripheral side of the annular housing material into a tubular shape by plastic working. Forming the inner peripheral wall and the outer peripheral wall, and the recess is a surface of the housing material before the plastic working. It provided a technical means.

[0007]

According to the present invention having the above-mentioned structure, the exciting coil is housed by forming the housing material into an annular shape and then forming the inner peripheral side and the outer peripheral side of the annular housing material into a cylindrical shape by plastic working. An inner peripheral wall and an outer peripheral wall of the storage portion are formed. The concave portion provided on the inner surface of the inner peripheral wall or the outer peripheral wall is provided beforehand in the housing material before plastic working.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of an electromagnetic clutch. The electromagnetic clutch 1 of this embodiment is mounted on a refrigerant compressor (not shown) of a vehicle refrigeration cycle, and includes a stator 2, a rotor 3, an armature 4, a hub assembly (described later) and the like.

The stator 2 comprises an exciting coil 5 which generates a magnetic force when energized and a stator housing 6 which holds the exciting coil 5. The exciting coil 5 is a well-known one in which a coil wire coated with an insulating coating is wound around a resin spool 7, and is housed in a stator housing 6 and then fixed by a molding resin 8.

The stator housing 6 is made of a magnetic material such as iron, and forms the magnetic path of the exciting coil 5 together with the clutch rotor 3 and the armature 4 which are also made of magnetic material. The stator housing 6 has a storage portion 6a (see FIGS. 5 and 6) for storing the excitation coil 5, and a plurality of recesses are formed on the inner surfaces of the annular inner peripheral wall 6b and the outer peripheral wall 6c forming the storage portion 6a. 9 is provided. The method of manufacturing the stator housing 6 will be described later. In this stator housing 6, an annular arm support 10 is fixed by welding to an end surface (right end surface in FIG. 1) on the refrigerant compressor side, and the arm support 10 is fixed to a housing 12 of the refrigerant compressor by a circlip 11. By doing so, positioning is performed in the axial direction (left and right direction in FIG. 1).

After the exciting coil 5 is housed in the housing portion 6a of the stator housing 6, the mold resin 8 is injected around the exciting coil 5 to fix the exciting coil 5 in the housing portion 6a. At this time, the mold resin 8 enters the concave portion 9 provided on the outer peripheral wall 6c of the housing portion 6a, so that the movement of the mold resin 8 in the circumferential direction and the axial direction (the left-right direction in FIG. 1) with respect to the stator housing 6 is prevented. Since it is regulated, the exciting coil 5 is prevented from coming off from the storage portion 6a.

The rotor 3 has an annular shape having a U-shaped section (an inverted U-shape in FIG. 1) for accommodating the stator 2, and a housing 12 of the refrigerant compressor 12 via a bearing 13 arranged on the inner periphery thereof. It is rotatably supported by. A pulley 14 is fixed to the outer peripheral portion of the rotor 3, and the rotor 3 is rotated by the rotational power of the engine transmitted via a multi-stage V belt (not shown) that is wound around the pulley 14. Further, the rotor 3 has a frictional surface on the one end face side in the axial direction facing the armature 4.

The armature 4 is composed of an inner ring 4a having an annular shape and an outer ring 4b having an annular shape which is supported on the outer circumference of the inner ring 4a with a constant gap therebetween, and faces the friction surface of the rotor 3. The end surfaces of the rings 4a and 4b are friction surfaces.

A ring shield 15 sandwiched between the rotor 3 and the bearing 13 is arranged on the inner peripheral side of the friction surface of the rotor 3 and the friction surface of the armature 4. The ring shield 15 prevents oil from splashing and adhering to the friction surface of the rotor 3 and the friction surface of the armature 4 when the rotor 3 rotates.

The hub assembly comprises an outer hub 16, an inner hub 17 arranged on the inner peripheral side of the outer hub 16, and a rubber hub 18 connecting the outer hub 16 and the inner hub 17, and when the energization of the exciting coil 5 is stopped, the rotor 3 The armature 4 so that a gap of about 0.5 mm is maintained between the friction surface of the armature 4 and the friction surface of the armature 4.
Support.

The outer hub 16 is an annular body having an L-shaped cross section (inverted L-shaped in FIG. 1) and is an outer ring 4 of the armature 4.
It is fixed to b by rivets 19. Inner hub 1
7 is provided in the shape of a stepped cylinder, and is a rotary shaft 2 of the refrigerant compressor.
It is fixed to the tip of 0 with a bolt 21. The rubber hub 18 is interposed between the inner peripheral surface of the outer hub 16 and the outer peripheral surface of the inner hub 17 in the radial direction, and is adhesively fixed to the two. Is deformed in the axial direction by being sucked into
When the excitation coil 5 is de-energized, its elastic force causes the armature 4 to move to the initial position (the position shown in FIG. 1).
Return to.

Next, a method of manufacturing the stator housing 6 will be described with reference to FIGS. First, a plate-shaped housing material 60 having a constant thickness is formed into a circular shape, and a recess 9 is formed on the surface of the housing material 60 (see FIG. 2). The recess 9 is provided by plastic working with a punch (not shown) or cutting with a drill (not shown).
A plurality of outer peripheral sides and inner peripheral sides are provided at equal intervals in the circumferential direction.

Subsequently, a drawing portion 61 is provided at the center of the housing material 60 by drawing, and a hole 62 is made in the center of the drawing portion 61 (see FIG. 3). Subsequently, the inner peripheral side of the housing material 60 is thinly formed into a cylindrical shape by ironing, which is a type of plastic working, to form the inner peripheral wall 6b of the storage portion 6a (see FIG. 4). At this time, the recess 9 provided on the inner peripheral surface of the housing material 60 is formed on the inner surface of the inner peripheral wall 6b.

Subsequently, the outer peripheral side of the housing material 60 is
The outer peripheral wall 6c of the storage portion 6a is formed by thinly forming a cylindrical shape by ironing similarly to the inner peripheral side (see FIG. 5). At this time, the recess 9 provided on the outer peripheral surface of the housing material 60 is formed on the inner surface of the outer peripheral wall 6c.
Through the above steps, the stator housing 6 having the recess 9 in the inner peripheral wall 6b and the outer peripheral wall 6c of the housing portion 6a is manufactured. 6 is a sectional view (sectional view taken along the line AA of FIG. 5) of the stator housing 6 showing a state of the recess 9 provided in the inner peripheral wall 6b and the outer peripheral wall 6c.

As described above, in this embodiment, the housing material 60 is previously prepared in the manufacturing process of the stator housing 6.
Since the concave portion 9 provided on the surface of the inner peripheral wall 6b and the outer peripheral wall 6c is formed on the inner surfaces of the inner peripheral wall 6b and the outer peripheral wall 6c of the accommodating portion 6a, a cutting process for forming the concave portion 9 after the inner peripheral wall 6b and the outer peripheral wall 6c are formed as in the conventional case Does not need

[Modification] In the present embodiment, the recesses 9 are provided on both the inner peripheral wall 6b and the outer peripheral wall 6c of the storage portion 6a, but they may be provided on only one of the wall surfaces. In addition, the step of forming the concave portion 9 includes the housing material 6 before the ironing process.
It should be 0. Therefore, in the manufacturing process of this embodiment, the recess 9 of the inner peripheral wall 6b needs to be provided at the stage of the housing material 60 shown in FIG. 2 or FIG. Shown (Housing material 60
The outer peripheral side may be provided before the ironing process).

In this embodiment, the outer peripheral wall 6c is replaced by the inner peripheral wall 6b.
However, the outer peripheral wall 6c may be formed first. Therefore, in this case, the recess 9 provided in the inner peripheral wall 6b may be provided at a stage before the inner peripheral side of the housing material 60 is ironed. Further, as the plastic working for forming the inner peripheral wall 6b and the outer peripheral wall 6c, the ironing work is shown, but the bending work or the like may be used.

[0023]

According to the present invention, a recess can be formed in the inner surface of the inner peripheral wall or the outer peripheral wall of the housing portion 6a in the process of manufacturing the stator housing. For this reason, it is not necessary to cut the inner surface or the outer surface of the storage portion 6a after manufacturing as in the conventional case, so that the formation of the recess is facilitated. Further, unlike the prior art in which a caulking portion is formed at the open end of the storage portion 6a to hold the spool, the caulking step is not required. As a result, the manufacturing cost of the stator housing can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an electromagnetic clutch.

FIG. 2 is a diagram showing a manufacturing process of the stator housing.

FIG. 3 is a diagram showing a manufacturing process of the stator housing.

FIG. 4 is a diagram showing a manufacturing process of the stator housing.

FIG. 5 is a diagram showing a manufacturing process of the stator housing.

6 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic clutch 2 Stator 5 Excitation coil 6 Stator housing 6a Storage part 6b Inner peripheral wall 6c Outer peripheral wall 8 Mold resin 9 Recessed portion 60 Housing material

Claims (1)

[Claims] 1. An exciting coil formed by winding a coil wire in an annular shape, and an accommodating portion for accommodating the exciting coil, and a recess is provided on an inner surface of an annular inner peripheral wall or an outer peripheral wall forming the accommodating portion. A stator housing, wherein the exciting coil is housed in the housing, and then the exciting coil is fixed to the housing by a mold resin injected into the housing. After forming a housing material for manufacturing a housing into an annular shape, the inner peripheral wall and the outer peripheral wall are formed by forming the inner peripheral side and the outer peripheral side of the annular housing material into a tubular shape by plastic working, respectively,
The method for manufacturing a stator housing of an electromagnetic clutch, wherein the recess is provided on a surface of the housing material before the plastic working.