JP2875753B2 - Armature assembly of electromagnetic coupling device - Google Patents

Abstract

PURPOSE: To provide an armature assembly of lightweight and small size in which distorsion of an armature support member is prevented. CONSTITUTION: A reinforced plastic plate 12 provided with a damper rubber housing part 13 is integrated with an armature hub 10 formed with a flange 10b by insert-molding. A rivet 14 is fixed to a damper rubber 15 housed in the damper rubber housing part 13, while an armature 16 is fixed to a leading end of the rivet 14. The armature 16 which is attracted to the side of the plate by elastic force of the damper rubber 15 abuts against a side surface 10e which is not coated with the plate 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature assembly of a damper rubber type electromagnetic coupling device used for, for example, an electromagnetic clutch for a car air conditioner.

[0002]

2. Description of the Related Art As an armature assembly for an electromagnetic coupling device of this kind, there is one proposed by the present applicant in Japanese Patent Application Laid-Open No. 4-262127. In the armature assembly proposed in this publication, not only is the armature support member formed of reinforced plastic, but also a reinforcing rib is integrally formed on the armature support member to increase rigidity and reliability of mechanical strength. Things. Further, the inner side in the radial direction of the armature support member made of reinforced plastic is integrally fixed by covering the entire outer peripheral surface of the cylindrical armature hub made of metal material by insert molding.

[0003]

However, even in an armature supporting member made of a reinforced plastic material having a reinforcing rib formed thereon, the elastic force of the damper rubber for supporting the armature movably in the axial direction on the armature supporting member is strong. In the electromagnetic clutch, the air gap between the armature and the rotor is narrowed. If this distortion is large, the armature that swings due to external vibrations comes into contact with the rotor in a non-excited state in which the electromagnetic coil is not energized. In order to prevent such distortion, the thickness of the armature support member must be increased to increase rigidity, but the device becomes large. The present invention has been made in view of such a problem, and an object of the present invention is to provide a lightweight and small armature assembly in which distortion of an armature support member is prevented.

[0004]

In order to achieve this object, an armature assembly of an electromagnetic coupling device according to the present invention is, as a first invention, an outer diameter of a flange portion of an armature hub from an inner diameter of an armature. In addition, the flange portion is formed as an aggregate for increasing the rigidity of the armature support member made of a reinforced plastic material by forming an escape portion for the fastening member in the flange portion. Also, as a second invention, the outer diameter of the flange portion of the armature hub is made larger than the inner diameter of the armature, and the relief portion of the fastening member and the uncovered portion of the armature support member are provided on the flange portion of the armature hub. By restricting the retreat of the armature drawn to the armature support member side by the damper rubber at the uncovered portion of the flange portion, the flange portion serving as an aggregate for increasing the rigidity of the armature support member made of a reinforced plastic material is used. The feature is that retreat is restricted.

In a third aspect of the present invention, the outer diameter of the flange of the armature hub is made larger than the inner diameter of the armature, and the flange of the armature hub has a relief portion for the fastening member and a non-supporting portion for the armature support member. By providing a covering portion and interposing a stopper rubber between the uncovered portion and the armature, a flange portion serving as an aggregate for increasing the rigidity of the armature support member made of a reinforced plastic material, via a stopper rubber The feature is that the retreat of the armature is restricted.

[0006]

In the electromagnetic clutch for a car air conditioner provided with the armature assembly of the present invention, the armature is magnetically attracted to the rotor against the elastic force of the damper rubber due to the magnetic attraction of the magnetic flux of the electromagnetic coil. Further, since the magnetic flux disappears when the power supply to the electromagnetic coil is cut off, the armature is drawn toward the armature support member by the elastic force of the damper rubber, and retreats and separates from the rotor. By repeating such an operation, a tensile force to the rotor side acts on the radially outer side of the armature support member due to the elastic force of the damper rubber, but the rigidity is increased by the flange portion of the armature hub. Tilt distortion is prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of an electromagnetic clutch provided with an armature assembly of an electromagnetic coupling device according to the present invention, and FIG.
FIG. 3 is a sectional view taken along line III-III of FIG. 2, and FIG. 4 is a front view for explaining the operation after the damper rubber has fallen off.
In these figures, an electromagnetic clutch indicated generally by reference numeral 1 is mounted on a compressor 2 for a car air conditioner, and is used as a power transmission device for transmitting and shutting off the rotation of an automobile engine to the compressor 2. . Reference numeral 3 denotes a rotor rotatably supported on a cylindrical portion 2a of the compressor 2 via a bearing 2b, and a plastic V-groove pulley 4 made of a plastic material is integrally fixed to an outer peripheral surface of the rotor 3. I have. 3a,
Numerals 3b are magnetic flux detour slits formed by punching, which are provided at intervals on the same circumference. The rotor 3 and the pulley 4 are attached with the rotor 3 as an insert in a mold of an injection molding machine.
It is formed by insert molding by injecting a plastic material into the mold from the gate. This molding method is disclosed in JP-A-4-290618. A field core 6 having an electromagnetic coil 5 provided therein is fitted in the annular groove of the rotor 3, and the field core 6 is screwed and fixed to a housing of the compressor 2 via a mounting plate 7.

An armature assembly 9 according to the present invention is mounted on a rotating shaft 8 of the compressor 2 so as to be integrally rotatable.
The armature assembly 9 is formed of a metal armature hub 10 serrated and fitted to the rotating shaft 8 and a backing plate 11 with which the tip of the rotating shaft 8 abuts as inserts, and these members are formed of reinforced plastic. It has a structure in which a disk-shaped plate 12 as an armature support member is integrally fixed by insert molding. The armature hub 10 includes a boss 10a having a serration groove formed on the inner peripheral surface to be fitted to the rotating shaft 8, and a boss 10a.
Disk-shaped flange portion 10 extending radially outward from the end face of the plate and serving as an aggregate for increasing the rigidity of the plate 12.
b. The flange portion 10b has a plurality of (six in this embodiment) engagement holes 10c formed at equal positions on the same circumference and a rivet (described later) formed in a semicircular shape on the outer peripheral edge. A plurality (three in this embodiment) of recesses 10d for the fastening members 14 are formed.

A plurality (three in this embodiment) of recessed rubber housings 13 formed in a radially outer side of the plate 12 at equal positions on the same circumference are cylindrically extending in the axial direction. A detent portion 12c is formed integrally with the radially inner disk portion 12b so as to engage with the engagement hole 10c of the armature hub 10. ing. The peripheral wall portion 12a of the damper rubber storage portion 13 is provided with a protruding portion 12h having a height higher than the height of a rivet 14 described later. At the tip of the rotation preventing portion 12c, a retaining portion 12d formed in a flat shape on the rotor 3 side of the flange portion 10b of the armature hub 10 is integrally formed, and the plate 12 is formed with the disc portion 12b and the retaining portion. The flange portion 10b is clamped between the armature hub 12d and the armature hub 10 and is integrally fixed to the armature hub 10. A cylindrical portion 12e functioning as a stopper for the backing plate 11 is provided on the inner peripheral edge of the plate 12.
However, a cylindrical cover portion 12f is integrally formed on the outer peripheral edge.

Reference numeral 14 denotes a rivet as a fastening member whose end on the opening side of the storage portion 13 is chamfered in an arc shape.
Is a damper rubber to which the rivet 14 is fixed at the center, and is press-fitted and fixed to the damper rubber storage portion 13 of the plate 12. The tip of the rivet 14 is connected to a rotor 3 through a through hole 12g formed in the bottom of the damper rubber housing 13.
It is projected to the side and caulked to the armature 16. The structure for fixing the rivet 14 and the armature 16 by caulking is disclosed in Japanese Utility Model Laid-Open Publication No. 4-32327. 16a is a magnetic flux detour slit, which is provided on the same circumference at intervals.

The inner diameter of the armature 16 is formed to be smaller than the outermost diameter of the flange portion 10b of the armature hub 10, and the armature 16 is formed by the elastic force of the damper rubber 15 so that the armature 16 becomes a plate of the flange portion 10b of the armature hub 10. 12 is in contact with the uncoated side surface (uncovered portion) 10e. That is, armature 1
The side surface 10e of the flange portion 10b abutting on the plate 6 is formed to be slightly higher than the radially outer facing surface of the plate 12 facing the outer peripheral edge of the armature 16.
The uncovered portion 10e of the armature hub 10 and the side surface of the plate 12 on the armature 16 side may be formed in the same plane. Also, armature hub 1
In some cases, the zero flange portion 10b may be completely embedded in the plate 12. Furthermore, the plate 12 may be covered to the outside of the boss 10a of the armature hub 10.

Next, the operation of the electromagnetic clutch configured as described above will be described. The magnetic flux Φ generated by energizing the electromagnetic coil 5 is transmitted from the rotor 3 to the armature 1 via the air gap by the slits 3a, 3b, 16a.
The magnetic flux flows in a double flux type magnetic flux path which is detoured to 6 and returns to the rotor 3. Due to the magnetic attraction of the magnetic flux, the armature 16 is magnetically attracted to the rotor 3 against the elastic force of the damper rubber 15, and the rotation of the automobile engine is transmitted to the compressor 2 for the car air conditioner. When the power supply to the electromagnetic coil 5 is stopped, the magnetic flux Φ disappears and the armature 16 is released.
Attracted to the side. Then, the armature 16 that retreats and separates from the rotor 3 is restricted from retreating by the uncovered portion 10e of the flange portion 10b of the armature hub 10.

In this embodiment, the outermost diameter of the flange portion 10b of the armature hub 10 is larger than the inner diameter of the armature 16, and
And smaller than the drilling position of the slit 16a,
Uncovered part 1 on flange 10b of armature hub 10
However, when the flange portion 10b is made of a non-magnetic material or when the outside of the flange portion 10b is completely covered with the plate 12, the armature hub 1 is used.
0 of the outer diameter of the flange portion 10b
The design can be changed to a structure larger than the position where the slit 16a is formed. When changing to such a structure,
The relief portion 10d of the rivet 14 formed on the flange portion 10b of the armature hub 10 is
The diameter of the through-hole may be the same as or larger than the diameter of the through-hole 12g.

Next, a safety measure when the damper rubber 15 comes off will be described with reference to FIG. In some cases, the electromagnetic clutch for a car air conditioner is required to be designed on the assumption that there is no problem in the design, even in the event of a scandal. In the event of misconduct, the damper rubber 15 which is baked and fixed to the rivet 14 and press-fitted and fixed in the damper rubber accommodating portion 13 may fall off due to frictional heat generated by repetition of operation and heat generated from the engine. is assumed. In such a case, the rivet 14 is not elastically returned by the damper rubber 15 and the electromagnetic clutch 1 is locked. If the power transmission state to the compressor for the car air conditioner is continued in this state, as shown in FIG. Next, the rivet 14 dissolves the accommodated peripheral wall portion 12a, further dissolves the plate 12 as shown by the two-dot chain line 14a, and finally dissolves the adjacent peripheral wall portion 12a. Therefore, in this embodiment, the protrusion 1 protruding from the head of the rivet 14 is formed on the peripheral wall 12a.
2h is provided, and the protruding portion 12h remains as a non-dissolving portion, so that the plate 12 is not separated.

Next, another embodiment according to the present invention will be described. FIG. 5 is a sectional view of the armature assembly, and FIG. 6 is a left side view of FIG. Note that the armature assembly 17 shown in these drawings is the same as the armature assembly 9 of the first embodiment.
Only the structure provided with the stopper rubber 18 is different from that of the first embodiment. The armature assembly 17
A plurality (three in this embodiment) of extension portions 10f are integrally formed on the flange portion 10b of the armature hub 10. Further, a small diameter portion of the stopper rubber 18 is press-fitted and fixed in a through hole formed in the extension portion 10f. The armature 16 drawn toward the plate 12 by the elastic force of the damper rubber 15 is in contact with the stopper rubber 18 so that the retreat position is restricted. The electromagnetic clutch including the armature assembly 17 having such a structure performs the same operation as the electromagnetic clutch 1 described above.

In the above embodiment, an example of the electromagnetic clutch is described as the electromagnetic coupling device. However, it is needless to say that the present invention can be applied to an electromagnetic brake for magnetically attracting an armature to a field core. Further, the detailed structure, such as forming the flange portion of the armature hub separately from the boss portion, is not limited to this embodiment, and it is needless to say that various design changes can be made.

[0017]

As described above, according to the present invention, as a first invention, the outer diameter of the flange portion of the armature hub is made larger than the inner diameter of the armature, and the escape portion of the fastening member is provided in the flange portion. Formed
The outermost diameter of the flange portion of the armature hub, which serves as an aggregate to increase the rigidity of the armature support member made of reinforced plastic, can be increased, and the tensile force acting on the armature support member by the elastic force of the damper rubber can be reduced. Since it can be reliably suppressed, the distortion can be prevented without increasing the thickness of the armature support member. Further, the fastening member can be made closer to the center of the armature assembly, and the outer diameter of the armature assembly can be reduced. Therefore, it is possible to provide a lightweight and compact armature assembly in which distortion of the armature support member is prevented.

According to a second aspect of the present invention, the outer diameter of the flange of the armature hub is made larger than the inner diameter of the armature, and the relief of the fastening member and the uncovered portion of the armature support member are provided on the flange of the armature hub. Armature hub retracted by the damper rubber is limited to the uncovered portion of the flange portion which is drawn to the armature support member side, so the flange of the armature hub which becomes an aggregate for increasing the rigidity of the armature support member made of a reinforced plastic material. Since the outermost diameter of the portion can be increased and the tensile force acting on the armature support member can be reliably suppressed by the elastic force of the damper rubber, the distortion can be prevented without increasing the thickness of the armature support member. You. Further, the fastening member can be made closer to the center of the armature assembly, and the outer diameter of the armature assembly can be reduced. Therefore, it is possible to provide a lightweight and compact armature assembly in which distortion of the armature support member is prevented. Further, in the present invention, even if the flatness of the side surface of the armature support member formed by the insert molding is poor, the flatness of the retreating armature is not deteriorated by the elastic force of the damper rubber, so that the reliability in quality is good. An armature assembly can be provided.

Still further, according to a third aspect of the present invention, the outer diameter of the flange portion of the armature hub is made larger than the inner diameter of the armature, and the flange portion of the armature hub has a relief portion for the fastening member and a non-supporting portion for the armature support member. The outer diameter of the flange portion of the armature hub flange which becomes an aggregate for increasing the rigidity of the armature support member made of the reinforced plastic material because the stopper rubber is provided between the uncovered portion and the armature because the cover portion is provided. Can be increased, and the tensile force acting on the armature support member can be reliably suppressed by the elastic force of the damper rubber, so that the distortion can be prevented without increasing the thickness of the armature support member. Further, the fastening member can be made closer to the center of the armature assembly, and the outer diameter of the armature assembly can be reduced. Therefore, it is possible to provide a lightweight and compact armature assembly in which distortion of the armature support member is prevented. Further, in the present invention, the armature drawn toward the armature support member by the elastic force of the damper rubber is provided between the uncovered portion of the flange portion of the armature hub and the armature and has a sufficient thickness of the stopper rubber. The armature release sound is quieter, and the rivet (fastening member) is in the axial direction as compared to the armature assembly in which a stopper rubber is interposed between the armature and the covering portion of the flange portion of the armature hub. Can be reduced, so that the dimension of the electromagnetic coupling device in the axial direction is also reduced.

[Brief description of the drawings]

FIG. 1 is a front view of an electromagnetic clutch including an armature assembly according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a front view illustrating the operation of the armature assembly according to the present invention after the damper rubber is dropped off.

FIG. 5 is a cross-sectional view of an armature assembly according to another embodiment of the present invention.

FIG. 6 is a side view of FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic clutch, 3 ... Rotor, 8 ... Rotating shaft, 9 ... Armature assembly, 10 ... Armature hub, 10b ... Flange part, 10e ... Uncoated part, 12 ... Plate, 12a
... peripheral wall part, 12h ... projecting part, 13 ... damper rubber storage part, 14 ... rivet (fastening member), 15 ... damper rubber, 16 ... armature, 18 ... stopper rubber.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16D 27/112 F16D 65/21

Claims (3)

(57) [Claims] 1. An armature hub having a boss mounted on a rotating shaft and a flange extending radially outward, and a radially inner side of the flange of the armature hub is covered by insert molding to be integrally formed. An armature support member made of a reinforced plastic material fixed, a plurality of recessed damper rubber storage portions integrally formed radially outside of the armature support member, and individually stored in these damper rubber storage portions. A damper rubber to which a fastening member whose tip projects from a through hole formed in the bottom of the damper rubber storage portion is individually fixed, and each tip of the fastening member is fixed to the armature support member by the damper rubber. An armature that is movably supported and is disposed outside a boss portion of the armature hub. In the armature assembly of the magnetic coupling device, an outer diameter of a flange portion of the armature hub is larger than an inner diameter of the armature, and a relief portion of the fastening member is formed in the flange portion. Armature assembly of coupling device. 2. An armature hub having a boss mounted on a rotating shaft and a flange extending radially outward, and a radially inner side of the armature hub is covered with insert molding by insert molding to integrally form the flange. An armature support member made of a reinforced plastic material fixed, a plurality of recessed damper rubber storage portions integrally formed radially outside of the armature support member, and individually stored in these damper rubber storage portions. A damper rubber to which a fastening member whose tip projects from a through hole formed in the bottom of the damper rubber storage portion is individually fixed, and each tip of the fastening member is fixed to the armature support member by the damper rubber. An armature that is movably supported and is disposed outside a boss portion of the armature hub. In the armature assembly of the magnetic coupling device, the outer diameter of the flange portion of the armature hub is made larger than the inner diameter of the armature, and the relief portion of the fastening member and the armature support member are provided on the flange portion of the armature hub. An armature assembly for an electromagnetic coupling device, wherein an uncovered portion is provided, and the retreat of the armature, which is drawn toward the armature support member by the damper rubber, is restricted by the uncovered portion of the flange portion of the armature hub. 3. An armature hub formed with a boss mounted on a rotating shaft and a flange extending radially outward, and a radially inner side of the armature hub is covered with insert molding by insert molding to be integrally formed. An armature support member made of a reinforced plastic material fixed, a plurality of recessed damper rubber storage portions integrally formed radially outside of the armature support member, and individually stored in these damper rubber storage portions. A damper rubber to which a fastening member whose tip projects from a through hole formed in the bottom of the damper rubber storage portion is individually fixed, and each tip of the fastening member is fixed to the armature support member by the damper rubber. An armature that is movably supported and is disposed outside a boss portion of the armature hub. In the armature assembly of the magnetic coupling device, the outer diameter of the flange portion of the armature hub is made larger than the inner diameter of the armature, and the relief portion of the fastening member and the armature support member are provided on the flange portion of the armature hub. An armature assembly for an electromagnetic coupling device, wherein an uncovered portion is provided, and a stopper rubber is interposed between the uncovered portion and the armature.