JPH10213154A - Electromagnetic connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts and assembly man-hour by providing an armature support member made of a plastic material with a flexible part which forms a profile by slits which pass through in the axial direction. SOLUTION: A plurality of sets of slits 9 constituted in such a manner that one pair thereof forms one set thereof are formed in a section provided on a first inner face of a flange part. The slits 9 pass through in the axial direction, are extended from an inner face in the radial direction toward the outside across an interval in the circumferential direction, and are connected on the outside in the radial direction. A flexible part 10 which can be elastically deformed is formed by these sets of slits 9. A profile of each flexible part 10 is formed by each set of slits 9. Moreover, an inner face (first stopper face) of an armature support member 8 is brought into contact with an anti-friction face side of an armature 12, and the flexible part 10 is elastically deformed to connect it with the armature 12. Furthermore, a second stopper face 13 is provided through the slits 9 in opposition to a peripheral wall face of a circular part 10b of the flexible part 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic coupling device having a damper function for absorbing a shock acting on a drive shaft of a driven device at the time of power transmission, and more particularly to a compressor for air conditioning of an automobile and a mechanical type for an automobile. The present invention relates to an electromagnetic coupling device suitable as a power transmission device mounted on a positive displacement pump such as a supercharger.

[0002]

2. Description of the Related Art An electromagnetic coupling device disposed in a power transmission path between an automobile engine and a driven device (for example, a compressor) includes a curved spring member for elastically supporting an armature on an armature hub. And Then, the spring member is elastically deformed in the rotating direction of the armature by a high load when driving the compressor, thereby absorbing an impact acting on the drive shaft of the compressor and preventing breakage of the drive shaft, This protects components on the power transmission path from damage.

As an electromagnetic coupling device provided with such a spring member, there is known an electromagnetic clutch for a compressor proposed in Japanese Patent Application Laid-Open No. 49-20552 (hereinafter referred to as Prior Invention 1).
Also, an electromagnetic clutch proposed in Japanese Utility Model Publication No. 63-3471 (hereinafter referred to as Prior Invention 2) and the like are known. The electromagnetic clutch according to the first aspect of the present invention has a field core in which an exciting coil wound in multiple turns is internally provided and fixed to a compressor housing, an annular groove into which the opening side of the field core is inserted, and an outer periphery. Is formed with a belt groove in which a V-belt is stretched. The rotor is rotatably supported via a bearing at a nose portion of the compressor, and a friction member opposes a friction surface of the rotor with a predetermined air gap. An armature having a surface formed thereon, and an armature hub which is elastically supported by a curved spring member and which is integrally mounted on a drive shaft of the compressor, are provided.

In the electromagnetic clutch according to the first aspect of the present invention, one of the spring members formed by forming spring steel into an arc shape and having locking portions at both ends is provided with one locking portion serving as a base end portion and a flange portion of an armature hub. To the body of the rivet to which the hub plate is fixed, and the other locking portion, which is a free end,
The armature is locked to the body of a rivet to which an armature plate is fixed. Such an electromagnetic clutch,
The armature is magnetically attracted to the rotor against the axial elastic force of the spring member by the magnetic flux of the exciting coil, and the rotation of the rotor is transmitted to the drive shaft to drive the compressor. In addition, the impact acting on the drive shaft of the compressor during this drive is absorbed by the elastic deformation of the spring member in the rotation direction of the armature, so that breakage of the drive shaft can be prevented.

On the other hand, the electromagnetic clutch of the prior invention 2 has a field core having an exciting coil therein, a rotor on which a V-belt is stretched,
An armature hub mounted on a drive shaft of the compressor, an armature elastically supported by a spring member curved to the armature hub, and the like are main components.
In the electromagnetic clutch according to the second aspect of the present invention, a damper rubber piece is fixed by baking to a damper shaft which is caulked on an armature and stands upright, and a damper case is fitted and fixed to the outside of the damper rubber piece. The damper case has a structure facing the arc-shaped notch formed in the flange portion of the armature hub, and the damper case is notched due to the elastic deformation of the spring member in the rotation direction of the armature when driving the compressor. It is hit against the wall of the part. In other words, the spring member is elastically deformed in the rotating direction until the damper case is hit against the wall surface of the notch and the damper rubber piece is compressed, thereby absorbing the shock acting on the drive shaft of the compressor. . Further, excessive elastic deformation due to high load is prevented, and breakage of the spring member is prevented.

[0006]

In the conventional electromagnetic coupling device, locking portions are provided at both ends of a curved spring member, and each locking portion is locked to a body portion of an armature hub or a rivet set up on the armature. Due to the structure and the structure in which the damper rubber piece and the damper case provided around the damper shaft erected on the armature face the arc-shaped notch provided on the flange of the armature hub, a large number of parts are produced. Poor. An object of the present invention is to solve such a problem and to provide an inexpensive electromagnetic coupling device.

[0007]

In order to solve the above problems, an electromagnetic coupling device according to a first aspect of the present invention includes an armature hub having a boss mounted on a shaft, and an armature hub integrally provided with the armature hub. An armature support member made of a plastic material, an armature disposed on the inner surface of the armature support member such that the anti-friction surface side is opposed to the armature support member, and an excitation coil that generates a magnetic flux including the armature as a part of a magnetic circuit. The armature support member has a plurality of flexible portions, each of which has an outline formed by a slit penetrating in the axial direction and is capable of elastic deformation, and a plurality of flexible portions that protrude from the inner surface of the flexible portion toward the armature side. A first stopper surface with which the anti-friction surface is in contact, and a second stopper surface circumferentially opposed to the peripheral wall surface of the flexible portion via the slit, The serial flexible portion is elastically deformed, characterized in that coupled individually to the armature.

The electromagnetic coupling device according to a second aspect of the present invention is the electromagnetic coupling device according to the first aspect, wherein the armature support member includes:
A plurality of pairs of the slits are provided in a one-to-one pair extending from the inner side to the outer side in the radial direction at an interval in the circumferential direction and coupled on the outer side, and the flexible portion is contoured by the respective slits. It is characterized by having.

The electromagnetic coupling device according to a third aspect of the present invention is the electromagnetic coupling device according to the first aspect, wherein the armature support member includes
A plurality of the slits extending in the circumferential direction and having a substantially central portion in the extending direction detouring inward in the radial direction are provided, and the flexible portion has a contour formed by the slits and an outer peripheral surface of the armature support member. It is characterized by having.

According to a fourth aspect of the present invention, there is provided an electromagnetic coupling device comprising:
In the electromagnetic coupling device of the present invention, a first inner surface and a second inner surface protruding from the first inner surface toward the armature are provided on an inner surface of the armature support member, and the first inner surface is provided. The flexible portion is formed in a portion having an inner surface, and the second inner surface is used as the first stopper surface.

According to a fifth aspect of the present invention, there is provided an electromagnetic coupling device comprising:
In the electromagnetic coupling device of the present invention, the armature hub is provided with a flange portion buried in the center side of the armature support member, and an inner surface of the flange portion is protruded from the inner surface of the armature support member toward the armature. By being exposed to the outside, the inner surface of the flange portion is used as the first stopper surface provided on the armature support member.

According to a sixth aspect of the present invention, there is provided an electromagnetic coupling device comprising:
The electromagnetic coupling device according to the invention is characterized in that a bone member capable of elastic deformation is embedded in the flexible portion.

[0013]

1 to 3 show a first invention and a second invention.
FIG. 1 is an electromagnetic clutch shown as an embodiment of an electromagnetic coupling device according to the present invention, FIG. 1 is a front view of the electromagnetic clutch, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. FIG. 3 is an enlarged sectional view. The electromagnetic clutch shown in these drawings is a device that is mounted on a compressor for automotive air conditioning and transmits power to a drive shaft of the compressor or cuts off the power transmission.

The electromagnetic clutch 1 has a field core 4 fixed to a housing 2 of a vehicle air-conditioning compressor via a mounting plate 3 and an annular groove 5a into which the field core 4 is inserted. A rotor 5 rotatably supported by a portion 2a via a bearing, and a drive shaft 2 of a compressor having a shaft end protruding from a nose portion 2a of the housing 2.
b. The armature assembly 6 is rotatably attached to the armature assembly 6. An excitation coil 4 a wound in multiple turns is provided inside the field core 4, and a V
The pulley 5b is fitted and welded.

As shown in an enlarged sectional view of FIG. 3, the armature assembly 6 has a cylindrical boss portion 7a spline-fitted to the shaft end of the drive shaft 2b, and an end portion of the boss portion 7a. A flange portion 7b formed integrally and having a substantially triangular shape in a front view.
And a plurality of through holes 7c formed in the flange portion 7b.
And an armature hub 7 provided with The armature hub 7 made of a metal material is integrally fixed to the drive shaft 2b by inserting a bolt 2c from a center hole 7d and tightening the bolt into a screw hole of the drive shaft 2b.

An armature support member 8 made of a plastic material is integrally provided around the flange portion 7b of the armature hub 7 by insert molding. The armature support member 8 is formed in a disk shape, and includes a boss 8a in which the flange 7b of the armature hub 7 is embedded, and a flange 8b extending radially outward from the boss 8a. On the inner side surface, a first inner side surface 8c provided at a position that divides the circumferential direction into three equal parts (a portion indicated by a two-dot chain line in FIG. 1), and an armature 12 to be described later from the first inner side surface 8c. A second inner side surface 8d protruding to the side is formed.

The portion provided with the first inner side surface 8c extends from the inside to the outside in the radial direction at an interval in the axial direction and penetrates in the axial direction, and extends from the inside to the outside in the radial direction. A plurality of pairs of slits 9 are formed in a paired pair, and a flexible portion 10 that can be elastically deformed is formed by each pair of the slits 9. Each flexible part 1
0 is a shape whose contour is formed by each set of slits 9 and has a rectangular portion 10a and a circular portion 10b;
One side of the rectangular portion 10a is supported by the armature support member 8. A rivet 11 is provided at the center of the circular portion 10b.
Are formed, and a ring-shaped projection 10d protruding from the periphery of the opening of the through hole 10c is formed. In addition, although the slits 9 of each set are opened and coupled to the outside in the radial direction of the armature support member 8, they may be coupled without opening to the outside in the radial direction. Also, the shape of the slit 9 and the flexible portion 10 can be changed in design. For example, the shape of the rectangular portion 10a of the flexible portion 10 may be curved in the rotational direction of the armature 12, like a conventional spring member.

The rivet 11 inserted through the through hole 10c
Is crimped in a stepped hole 12a of the armature 12 fitted to the outside of the boss portion 7a of the armature hub 7, and the anti-friction side of the armature 12 is on the second inner surface 8d of the armature support member 8. First stopper surface)
And the flexible portion 10 is elastically deformed and connected to the armature 12. The friction surface of the armature 12 faces the friction surface of the rotor 5 via a predetermined air gap G. Reference numeral 12b is the center hole of the armature 12, and reference numeral 12c is the armature 12
Are arc-shaped demagnetization slits continuously provided on the same circumference of the magnetic field.

The electromagnetic clutch 1 having such a structure
The rotor 5 on which a belt (not shown) is stretched rotates by driving of the engine. When a magnetic flux is generated by energizing the exciting coil 4a, the magnetic flux is generated by the magnetic-disconnection slit 5c of the rotor 5.
5d flows around the magnetic-disconnection slit 12c of the armature 12, bypassing the elastic force of the flexible portion 10;
Since the rotor 2 is magnetically attracted to the rotor 5, the rotation of the rotor 5 is transmitted to the drive shaft 2b to drive the compressor. Excitation coil 4
If the magnetic flux is extinguished by cutting off the current supply to the armature 12, the armature 12 is separated from the rotor 5 by the elastic force of the flexible portion 10.
The compressor stops. Further, the armature 12 separated from the rotor 5 is elastically deformed and connected to the armature 12 by the preset load (initial elastic return force in the axial direction) of the flexible portion 10 applied to the armature support member 8. Will be retained.

In the repetition of such an operation, the flexible portion 10 elastically deforms in the rotation direction of the armature 12 due to a high load when driving the compressor. The peripheral wall surface of the flexible portion 10 that is excessively elastically deformed, more specifically, the peripheral wall surface of the circular portion 10b of the flexible portion 10 is hit against the second stopper surface of the armature support member 8 indicated by reference numeral 13 in FIG. In addition, breakage of the flexible portion 10 is prevented. Therefore, the impact acting on the drive shaft 2b of the compressor is absorbed, and breakage of the drive shaft 2b is prevented.

In the above description, the second inner surface 8d of the armature support member 8 is the first stopper surface with which the anti-friction surface side of the armature 12 contacts, but the second inner surface 8d is made of a rubber piece. The stopper rubber may be fixed, and the end surface of the stopper rubber may be used as the first stopper surface. Also, as in another embodiment described below, the inner surface of the flange portion 7b of the armature hub 7 made of a metal material can be used as the first stopper surface.

Next, a sectional view of the armature assembly shown in FIG. 4 will be described as an embodiment according to the electromagnetic coupling device of the fifth invention. The same members or substantially the same members as those in the above embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will not be repeated. In the armature assembly 14, the inner surface 7e of the flange portion 7b of the armature hub 7 projects to the armature 12 side from the second inner surface 8d of the flange portion 8b of the armature support member 8 and is exposed to the outside.
The armature 12 is held by the armature support member 8 in a state where the anti-friction surface side is in contact with the inner side surface 7e of the flange portion 7b by the preset load of the flexible portion 10. A gap S is formed between the side surface of the armature 12 on the side opposite to the friction surface and the second inner side surface 8d of the armature support member 8. The circular portion 1 of the flexible portion 10
The ring-shaped protrusion 10d shown in FIG. 3 is not formed on 0b. The presence or absence of such a projection 10d is designed in consideration of the strength of the circular portion 10b against the caulking load of the rivet 11.

The electromagnetic clutch provided with the armature assembly 14 having such a structure repeats the operation in the same manner as the electromagnetic clutch 1 described above to drive and stop the compressor.

Next, a front view of the armature assembly shown in FIG. 5 will be described as an embodiment according to the electromagnetic coupling device of the sixth invention. The same members or substantially the same members as those in the above embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will not be repeated. The armature assembly 15 differs from the armature assembly 14 of FIG. 4 in that a bone member 16 is embedded in the flexible portion 10 of the armature support member 8. The bone member 16 is a member that can be elastically deformed, such as a piano wire, and its distal end extending in three directions from the center is formed into a shape similar to the contour of the flexible portion 10 and bent into a V-shape at the center. This portion is fitted and fixed in a U-shaped groove formed in the end face of the armature hub 7.

The electromagnetic clutch provided with the armature assembly 15 having such a structure repeats the operation in the same manner as the electromagnetic clutch 1 described above to drive and stop the compressor.

Next, an armature assembly shown in FIGS. 6 and 7 will be described as an embodiment according to the electromagnetic coupling device of the third invention. FIG. 6 is a sectional view, and FIG. 7 is a front view. The same members or substantially the same members as those in the above embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will not be repeated. In the armature assembly 17, an armature support member 18 made of a plastic material is fixed to a flange portion 7b of the armature hub 7 which is spline-fitted to the drive shaft 2b of the compressor with rivets 19. Note that the armature hub 7 is fixed to the drive shaft 2b by a backing plate 20 and bolts 2c.

The armature support member 18 has a rib portion 21 extending in the radial direction at a position dividing the circumferential direction into three equal parts. Each rib portion 21 is provided with an armature support member 18.
Rectangular first protrusion 21a provided near the center of
And a prism-shaped second protrusion 21 extending from the first protrusion 21a to the outer peripheral surface of the armature support member 18.
b. In addition, slits 22 penetrating in the axial direction are individually formed in the portions divided into three by the rib portions 21. The slit 22 is formed in the second protrusion 21
a first slit portion 22a extending in parallel to contact with the first slit portion 22b
A second slit portion 22b extending in an arc shape;
A third slit portion 22c extending in the shape of a letter and detoured radially inward, and one of the first slit portions 22a.
, And extends in the circumferential direction at the center in the extending direction, is detoured inward in the radial direction, and is connected to the other first slit portion 22a.

An arcuate flexible portion 23 is formed in the armature support member 18 by the slit 22 thus formed and the outer peripheral surface of the armature support member 18. The flexible portion 23 has the second side of the rib portion 21 on both sides in the circumferential direction.
And has a mounting portion 23a protruding inward in the radial direction. The armature support member 18 has a first inner surface 18a on the inner surface of the portion where the flexible portion 23 including the attaching portion 23a is formed, and a second inner surface 18b (first first surface) on the other surface. Stopper surface). Then, in a state where the anti-friction surface side of the armature 12 is in contact with the second inner side surface 18b of the armature support member 18, the mounting portion 23a is attached to the rivet 2.
By fixing to the armature 12 at 4, the flexible portion 2
3 is given a preset load. Also, slit 2
The notch 18c of the armature support member 18 formed by the second member 2 is provided as a second stopper surface.

The electromagnetic clutch provided with the armature assembly 17 having such a structure repeats the operation in the same manner as the electromagnetic clutch 1 described above to drive and stop the compressor.

Although the electromagnetic clutch described in detail above has been exemplified as a power transmission device mounted on a compressor for air conditioning of an automobile, it can also be used as a power transmission device of other auxiliary equipment for an automobile or a general industrial machine. The electromagnetic coupling device according to the present invention is also applied to an electromagnetic brake in which an armature is magnetically attracted to a field core, and to a coil rotary electromagnetic coupling device in which the field core rotates.

Furthermore, the armature assembly is a combination of an armature hub made of a metal material and an armature support member made of a plastic material. However, these members can be provided integrally with a plastic material.
In a low-load electromagnetic coupling device in which an integrated armature hub and an armature support member are provided as a plastic gear, and the gear is rotatably mounted on a shaft, a shaft hole in a plastic armature hub is provided. There is no need to interpose a bearing between the shaft and the shaft, which is effective.

[0032]

According to the electromagnetic coupling device of the first invention, a flexible portion whose contour is formed by a slit penetrating in the axial direction is provided on the armature support member made of a plastic material. It is not necessary to prepare a spring portion formed in the electromagnetic coupling device, so that the number of parts and the number of assembly steps can be reduced, and the productivity of the electromagnetic coupling device is improved. In addition, by considering the elastic limit of the flexible portion and the slit width in design, it is possible to omit a damper mechanism including a damper shaft, a damper rubber piece, and a damper case that are erected on an armature as in the related art. The performance is improved.

An electromagnetic coupling device according to a second aspect of the present invention is the electromagnetic coupling device according to the first aspect, wherein the armature support member comprises:
A plurality of pairs of the slits are provided in a one-to-one pair extending from the inner side to the outer side in the radial direction at an interval in the circumferential direction and coupled on the outer side, and the flexible portion is contoured by the respective slits. Since the slits are provided, a flexible portion having only one side supported by the armature support member is formed, and the second stopper surface is formed on the armature support member. Therefore, the productivity of the electromagnetic coupling device is improved.

An electromagnetic coupling device according to a third aspect of the present invention is the electromagnetic coupling device according to the first aspect, wherein the armature support member includes:
A plurality of the slits extending in the circumferential direction and having a substantially central portion in the extending direction detouring inward in the radial direction are provided, and the flexible portion has a contour formed by the slits and an outer peripheral surface of the armature support member. Since the slits are provided, a flexible portion having both sides supported by the armature support member is formed, and the second stopper surface is formed on the armature support member. Therefore, the productivity of the electromagnetic coupling device is improved, and since the structure in which both sides of the flexible portion are supported by the armature support member is provided, the durability of the flexible portion against a high load is improved.

An electromagnetic coupling device according to a fourth aspect of the present invention includes the first, second, and third electromagnetic coupling devices.
In the electromagnetic coupling device of the present invention, a first inner surface and a second inner surface protruding from the first inner surface toward the armature are provided on an inner surface of the armature support member, and the first inner surface is provided. Since the flexible portion is formed in a portion having an inner surface and the second inner surface is used as the first stopper surface, the anti-friction surface side of the armature is used as the second inner surface of the armature support member. Then, by connecting the flexible portion of the armature support member to the armature, the assembly of the armature assembly is completed. In addition, the flexible portion connected to the armature has a preset load (an initial elastic return force in the axial direction) commensurate with the amount of protrusion of the second inner surface with respect to the first inner surface of the armature support member.
Is set. Therefore, there is no need to provide a member such as a stopper rubber for restricting the retreat of the armature on the armature support member, and the productivity of the electromagnetic coupling device is improved.

An electromagnetic coupling device according to a fifth aspect of the present invention provides the electromagnetic coupling device of the first, second, and third aspects.
In the electromagnetic coupling device of the present invention, the armature hub is provided with a flange portion buried in the center side of the armature support member, and an inner surface of the flange portion is protruded from the inner surface of the armature support member toward the armature. By being exposed to the outside, the inner surface of the flange portion is configured to be the first stopper surface provided on the armature support member, so that the flexible portion to which a preset load is applied provides a counter friction surface of the armature. The side abuts against the flange of the armature hub. Therefore, the anti-friction surface side of the armature, which has been heated to a high temperature by the frictional heat, does not contact the inner surface of the armature support member made of a plastic material. Since it does not act on the support member, the durability of the armature support member is improved.

According to a sixth aspect of the present invention, there is provided an electromagnetic coupling device comprising:
In the electromagnetic coupling device according to the present invention, since the flexible portion has a structure in which an elastically deformable bone member is embedded, the strength of the flexible portion is increased, and the durability of the flexible portion against a high load is improved. Is done.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view of the armature assembly of FIG. 2;

FIG. 4 is a cross-sectional view of the armature assembly.

FIG. 5 is a front view of the armature assembly.

FIG. 6 is a cross-sectional view of the armature assembly.

FIG. 7 is a front view of the armature assembly.

[Explanation of symbols]

 7 Armature hub 8 Armature support member 8d Second inner surface (first stopper surface) 9 Slit 10 Flexible part 12 Armature 13 Second stopper surface 16 Bone member 18 Armature support member 18b: second inner surface (first stopper surface) 18c: notch portion (second stopper surface) 22: slit 23: flexible portion

Claims (6)

[Claims] An armature hub provided with a boss mounted on a shaft, an armature support member made of a plastic material provided integrally with the armature hub, and an anti-friction surface facing an inner surface of the armature support member. Armature, and an exciting coil that generates a magnetic flux that uses the armature as a part of a magnetic circuit, wherein the armature support member has a contour formed by a slit penetrating in the axial direction, and has an elastic deformation. A plurality of flexible portions, a first stopper surface protruding from the inner surface of the flexible portion to the armature side and contacting the anti-friction surface side of the armature, a peripheral wall surface of the flexible portion, and the slit And a second stopper surface which is circumferentially opposed through the elastic member, and the flexible portion is elastically deformed and connected to the armature individually. Electromagnetic coupling device. 2. The electromagnetic coupling device according to claim 1, wherein said armature support member is provided in a one-to-one pair that extends from the inside in the radial direction to the outside at an interval in the circumferential direction and is connected to the outside. The electromagnetic coupling device, wherein a plurality of sets of the slits are provided, and wherein the flexible portion has an outline formed by each set of the slits. 3. The electromagnetic coupling device according to claim 1, wherein the armature support member is provided with a plurality of slits extending in a circumferential direction and having a substantially central portion in an extending direction detouring radially inward. The electromagnetic coupling device is characterized in that the flexible portion has an outline formed by the slit and an outer peripheral surface of the armature support member. 4. The electromagnetic coupling device according to claim 1, wherein an inner surface of said armature support member protrudes from said first inner surface to said armature side from said first inner surface. A second inner side surface, wherein the flexible portion is formed at a portion having the first inner side surface, and the second inner side surface is used as the first stopper surface. apparatus. 5. The electromagnetic coupling device according to claim 1, wherein the armature hub is provided with a flange buried at a center side of the armature support member.
By projecting the inner surface of the flange portion to the armature side from the inner surface of the armature support member and exposing the flange portion to the outside, the first inner surface of the flange portion is provided on the armature support member with the first stopper surface. An electromagnetic coupling device, comprising: 6. The electromagnetic coupling device according to claim 1, wherein an elastically deformable bone member is embedded in the flexible portion.