JPH04262127A - Electromagnetic connecting device - Google Patents

Abstract

PURPOSE:To prevent a device to become too large and improve durability in forming the armature supporting member of an electromagnetic connecting device by reinforced plastics. CONSTITUTION:An armature 17 is brought into contact with a plate 13 made of reinforced plastics. The plate 13 becomes a buffer and it becomes unnecessary to provide between these members an elastic member to absorb hitting striking noises, enabling thicker and more sturdy formation of the plate 13 by limiting the dimension in the axial direction of a device to a small value. A rivet 35 for fixing the plate 13 is inserted through a reinforcement rib 32. This constitution allows stresses to be distributed over the rib 32, providing high rigidity. In addition, an engagingly locking part 13b is reinforced by providing an annular shaped rib 13c to the recessed part 13a of a dumper rubber 16 of the plate 13.

Description

[Detailed description of the invention]

0001

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

0002

[Prior Art] An electromagnetic clutch as an electromagnetic coupling device is
It is well known as a joint that supports an armature on an armature hub via an elastic member such as a leaf spring or damper rubber, and magnetically attracts the armature to a rotor against the elastic force of the elastic member. Among conventional electromagnetic clutches, electromagnetic clutches for car air conditioners use a damper rubber system for the purpose of cushioned starts and noise prevention. In recent years, there has been a demand for lighter weight devices in this type of electromagnetic clutch, and attention has been paid to the use of reinforced plastic for the rotating portion, as proposed in, for example, Japanese Patent Laid-Open No. 50-54753.

[0003] Aiming at such weight reduction, the applicant has developed an electromagnetic clutch as described in Japanese Patent Publication No. 2-2009. This electromagnetic clutch is made by integrally molding an armature support member that supports an armature using aluminum die-casting or the like, and includes a damper rubber that is fitted and fixed in a recess on the outer circumferential side of the armature support member, and a The armatures were connected via a rivet that was integrally provided and passed through the armature support member. Further, the armature support member is riveted to a flange of an armature hub that is mounted on the rotating shaft. A stopper rubber is interposed between the armature and the armature support member in order to suppress the hitting sound when the armature contacts the armature support member. Further, the damper rubber is engaged with the inner peripheral step of the recessed portion, and is prevented from being pulled out toward the armature by this engaged portion.

0004

[Problems to be Solved by the Invention] The applicant prototyped an armature support member made of reinforced plastic in place of the armature support member made of aluminum die-casting mentioned above, and attempted a durability test of an electromagnetic clutch using the same. A problem occurred as described in . That is, compared to an armature support member made of aluminum die-casting, satisfactory strength cannot be obtained in terms of quality unless the plate thickness and rib height are increased. Therefore, the axial dimension of the device becomes large. In addition, a through hole for inserting a rivet is formed at the bottom of the recessed part filled with damper rubber, and the opening edge (step) of this through hole must also be made thick, otherwise the strength will be insufficient. This will cause the damper rubber to no longer function as a stopper. This drawback can be overcome by forming the through hole with a small diameter, but this changes the effective diameter of the damper rubber and changes its deflection characteristics. Furthermore, since the reinforced plastic armature support member is caulked and fixed to the flange of the armature hub using rivets, cracks may occur in the area around the rivet during press processing to caulk the rivet or during durability tests. Ta.

[0005]

In an electromagnetic coupling device according to a first aspect of the invention, an armature support member is made of reinforced plastic, and an armature is attached to the armature support member in contact with the armature support member.

[0006] In the electromagnetic coupling device according to the second invention, the armature support member is made of reinforced plastic, and the fastening member for fixing the armature support member to the armature hub is attached to a reinforcing rib integrally molded on the armature support member. It is penetrated.

[0007] An electromagnetic coupling device according to a third aspect of the present invention is the electromagnetic coupling device according to the first or second aspect of the present invention, in which a locking portion is provided in which the outer peripheral portion of the damper rubber comes into contact with the damper rubber concave portion of the armature support member. and an annular reinforcing rib that extends from the locking portion radially inward of the recessed portion and is provided in a series along the circumferential direction of the recessed portion.

[0008]

According to the first aspect of the invention, since the armature support member serves as a substantial buffer, the hitting sound generated when the armature abuts against the armature support member is attenuated by the armature support member and becomes small. For this reason,
Since stopper rubber is not required, the armature support member can be formed thicker. According to the second invention, stress applied from the fastening member to the armature support member is dispersed to the reinforcing ribs. According to the third invention, the rigidity required to prevent the damper rubber from coming off can be obtained without making the locking portion thick or having a small inner diameter.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the first and third inventions will be described in detail below with reference to FIGS. 1 to 4. Figure 1 is a front view of an electromagnetic coupling device according to the first and third inventions, and Figure 2 is Figure 1.
3 is a rear view of the electromagnetic coupling device according to the first and third inventions, and FIG. 4 is a sectional view of the electromagnetic coil extraction part of the electromagnetic coupling device according to the first and third inventions. It is. In these figures, 1 is an electromagnetic clutch as an electromagnetic coupling device according to the present invention, and this electromagnetic clutch 1 is attached to a car air conditioner compressor 2 and is connected to an engine (
It is configured to transmit rotation (not shown) to the rotating shaft 3 of the compressor 2 or to interrupt the transmission. A rotor 4 with a pulley is rotatably supported in the cylindrical portion 2a of the compressor 2 via a bearing, and a field core 5 screwed to the compressor 2 is inserted into an annular groove of the rotor 4. This field core 5 has an electromagnetic coil 7 fitted inside a coil bobbin 6, and a cover 8 is provided on the exposed part of the electromagnetic coil 7.
It is covered with Further, one end of the winding start and end of the electromagnetic coil 7 is connected to a field core 5 as a ground wire.
The other end is connected to the lead wire 9 within the terminal housing portion of the coil bobbin 6 by a terminal fitting 10. Note that this structure is disclosed in Japanese Utility Model Application Publication No. 2-72821. An armature assembly 11 is mounted on the rotating shaft 3 of the compressor 2 for transmitting the rotation of the rotor 4 to the rotating shaft 3. This armature assembly 11 includes an armature hub 12 connected to the rotating shaft 3 through serrations.
and a plate 13 made of reinforced plastic as an armature support member, and this plate 13 is fixed to the armature hub 12 with rivets 14. Note that the armature hub 12 and plate 13
is secured to the rotating shaft 3 by a bolt 12a.

The plate 13 has a substantially triangular shape when viewed from the front, and a recessed portion 13a having a circular shape when viewed from the front is formed at each corner. A damper rubber 16 having a rivet 15 fixed at its center is press-fitted into this concave portion 13a. Note that this plate 13 is formed to have a slightly larger axial dimension than the armature support member made of aluminum die-casting. The bottom portion of the recessed portion 13a has a locking portion 13b that the outer peripheral side end surface of the damper rubber 16 comes into contact with, and a locking portion 13b that is connected to the recessed portion 13 from the locking portion 13b.
an annular rib 1 that extends inward in the radial direction of a and is provided continuously along the circumferential direction of the concave portion 13a;
3c is provided. The rivet 15 is composed of a large diameter portion fixed to the damper rubber 16 and a small diameter portion protruding from the plate 13 toward the rotor 4, and an armature 17 is caulked and coupled to the tip of the small diameter portion. 15a indicates a caulking portion of the rivet 15. By attaching the armature 17 to the rivet 15 in this way, the armature 17 is attached to the plate 17 through the damper rubber 16.
It is supported so that it can move freely in the axial direction. When attaching the armature 17 to the plate 13, attach the rivet 1 with the armature 17 in contact with the plate 13.
The small diameter part of the rivet 15 is inserted into the rivet hole of the armature 17, and the step part 15b of the rivet 15 is pushed up to the back surface 13d of the plate 13 while bending the damper rubber 16 toward the armature 17. Then, while bringing the stepped portion 15b into contact with the armature 17, the tip 15 of the rivet 15 is
Crimp a by press working. In FIG. 2, the position of the stepped portion 15b before caulking is indicated by a chain double-dashed line. By performing such processing, an initial reaction force can be applied to the damper rubber 16, and the armature 17 can be prevented from swinging due to external vibrations. Note that 18 is a concave portion formed to reduce the weight of the plate 13.

In the electromagnetic clutch 1 constructed as described above, when the electromagnetic coil 7 is demagnetized, the armature 17 is pulled by the damper rubber 16 and separated from the rotor 4. is not transmitted. When the electromagnetic coil 7 is energized from this state, the armature 17 is magnetically attracted to the rotor 4 while elastically deforming the damper rubber 16 in the compression direction (axial direction). At this time, the rotation of rotor 4 is
7 to the rotating shaft 3 via the damper rubber 16, plate 13, armature hub 12, etc. Furthermore, when the power to the electromagnetic coil 7 is cut off from this state, the adsorption of the armature 17 to the rotor 4 is released, and the compressed damper rubber 16 is elastically restored, causing the armature 17 to move toward the plate 13. do. At this time, the armature 17 comes into contact with the plate 13 and a hitting sound is generated, but since the plate 13 is made of reinforced plastic, it essentially acts as a buffer.
The hitting sound is attenuated by the plate 13 and becomes smaller.

[0012] Therefore, in the electromagnetic clutch 1 constructed in this manner, the plate 13 of the armature assembly 11 serves as a substantial buffer, so that the impact noise generated when the armature 17 abuts against the plate 13 is small. Become. Therefore, the stopper rubber that was conventionally interposed between the armature and the armature support member can be eliminated, and the plate 13 can be made thicker accordingly. That is, in this electromagnetic clutch 1, although the thickness of the plate 13 is increased to increase the rigidity,
The axial dimensions of the device will not be very large. Furthermore, since the reinforcing ribs 13c are provided on the locking portion 13b that receives the end surface of the damper rubber 16 in the concave portion 13a, the damper rubber 16 does not have to be thick or have a small inner diameter. Provides rigidity to prevent it from coming off. Therefore, the locking portion 13b can be formed firmly without changing the bending characteristics of the damper rubber 16.

[0013] In the above embodiment, an example was shown in which the rib 13c was formed in a stepped manner on the locking part 13b of the recessed part 13a.
The side surfaces of the ribs may also be inclined to form a tapered shape. Further, in the above embodiment, the armature assembly 11 is formed separately into the armature hub 12 and the plate 13, but as shown in FIGS. 5 and 6, the boss portion of the hub may be integrally formed on the plate. . FIG. 5 is a sectional view showing another example of an armature assembly in which a boss is integrally formed with a plate, and FIG. 6 is a sectional view showing another example of an armature assembly in which a backing plate is embedded in the boss portion. In these figures, the same or equivalent members as those explained in FIG. 2 are given the same reference numerals, and detailed explanations will be omitted. In these figures, 20 and 22 are armature assemblies, and the armature assemblies 20 and 22 are integrally provided with boss portions 20a and 22a that constitute an armature hub. Reference numeral 21 denotes a boss member which is connected to the rotating shaft 3 through serrations. The boss member 21 is made of metal and has a cylindrical shape, and is insert-molded into the boss portions 20a and 22a. In addition, in FIG. 6, 23 is a caul plate, and this caul plate is formed in an annular shape by 23 metal material,
Armature assembly fixing bolt (not shown) and rotating shaft 3
It is insert-molded together with the boss member 21 on the base side of the boss portion 22a so as to be interposed between the boss member 21 and the boss member 21. In addition, the above-mentioned boss member 21 and patch plate 23 are manufactured by Japanese Unexamined Patent Publication No. 50-5
As described in Japanese Patent No. 4753, it is preferable to previously provide a protruding collar on the outer periphery.

Next, the electromagnetic coupling device according to the second invention will be explained in detail with reference to FIGS. 7 and 8. 7 is a front view of an armature assembly used in the electromagnetic coupling device of the second invention, and FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 7. In these figures, the same or equivalent members as those explained in FIGS. 1 and 2 are given the same reference numerals, and detailed explanations will be omitted. In these figures, 30
is an armature assembly, and 31 is an armature support plate of this armature assembly 30. The plate 31 is integrally molded from reinforced plastic, and has reinforcing ribs 32 protruding from its front side. The reinforcing rib 32 is composed of an annular portion 32a arranged to surround the armature assembly fixing bolt 33, and a straight portion 32c extending radially from the annular portion 32a and connected to the plate outer peripheral rib 32b. . A rivet insertion hole 3 is provided at the intersection of the annular portion 32a and the straight portion 32c.
4 is drilled. Reference numeral 35 denotes a rivet for fixing the plate 31 to the armature hub 12, and the rivet 35 is passed through the rivet insertion hole 34 of the plate 31 and pressed. When the rivet 35 is passed through the reinforcing rib 32 integrally formed on the plate 31 in this way, the stress applied from the rivet 35 to the plate 31 is dispersed to the reinforcing rib 32, thereby increasing the rigidity of the area around the rivet insertion hole. can be increased.

In the embodiment shown in FIGS. 7 and 8, the head of the armature assembly fixing bolt 33 is attached to the rib 32.
9 to 11.
As shown in FIG. 3, ribs can also be provided in the portions corresponding to the armature assembly fixing bolts 33. Figure 9 is a front view of a plate with fixing bolt insertion holes drilled in the reinforcing ribs of the plate, Figure 10 is a front view of a plate with additional reinforcing ribs than the plate shown in Figure 9, and Figure 11 is a front view omitted. FIG. 3 is a front view of a plate in which reinforcing ribs are provided by arranging triangular concave portions. In these figures, the same or equivalent members as those explained in FIG. 7 are given the same reference numerals and detailed explanations will be omitted. In these figures,
36 is a fixing bolt insertion hole through which an armature assembly fixing bolt (not shown) is passed;
is bored in a center rib 32d extending from the annular portion 32a of the reinforcing rib 32 to the radial center of the plate 31. Note that the reinforcing ribs 32 shown in FIG.
It is formed by providing a plurality of concave portions each having a substantially triangular shape when viewed from the front, and each portion is formed substantially linearly.

[0016]

As explained above, in the electromagnetic coupling device according to the first invention, the armature support member is made of reinforced plastic, and the armature is attached to the armature support member in contact with the armature support member. Since it becomes a substantial buffer, the hitting sound generated when the armature abuts against the armature support member is attenuated by the armature support member and becomes small. Therefore, the stopper rubber is not required, and the armature support member can be made thicker. Therefore, the rigidity of the armature support member can be increased without increasing the size of the device. Further, in the electromagnetic coupling device according to the second invention, the armature support member is formed of reinforced plastic, and the fastening member for fixing the armature support member to the armature hub is penetrated through a reinforcing rib integrally molded on the armature support member. Therefore, the stress applied from the fastening member to the armature support member is dispersed to the reinforcing ribs. Therefore, the rigidity of the vicinity of the fastening member insertion hole can be increased. Furthermore, in the electromagnetic coupling device according to the first or second invention, the electromagnetic coupling device according to the third invention further includes a locking portion in which the outer peripheral portion of the damper rubber comes into contact with the damper rubber recessed portion of the armature support member. , an annular reinforcing rib extending from the locking portion to the inside of the recess in the radial direction and provided in a series along the circumferential direction of the recess is provided, so that the locking portion can be made thicker or its inner diameter can be made smaller. Even if it is not formed, rigidity to prevent the damper rubber from coming off can be obtained. Therefore, the locking portion can be formed firmly without changing the bending characteristics of the damper rubber. Therefore, according to the present invention, it is possible to provide a damper rubber type electromagnetic coupling device that is highly durable, lightweight, and compact.

[Brief explanation of the drawing]

FIG. 1 is a front view of an electromagnetic coupling device according to first and third inventions.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a rear view of the electromagnetic coupling device according to the first and third inventions.

FIG. 4 is a cross-sectional view of the electromagnetic coil extraction portion of the electromagnetic coupling device according to the first and third inventions.

FIG. 5 is a sectional view showing another example of an armature assembly in which a boss is integrally formed on a plate.

FIG. 6 is a sectional view showing another example of an armature assembly in which a backing plate is embedded in a boss portion.

FIG. 7 is a front view of an armature assembly used in the electromagnetic coupling device of the second invention.

8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. FIG.

FIG. 9 is a front view of a plate in which fixing bolt insertion holes are formed in reinforcing ribs of the plate.

10 is a front view of a plate with additional reinforcing ribs compared to the plate shown in FIG. 9; FIG.

FIG. 11 is a front view of a plate in which reinforcing ribs are provided by arranging concave portions that are generally triangular when viewed from the front.

[Explanation of symbols]

3 Rotation axis 12 Armature hub 13 Plate 13a Recessed part 13b Locking part 13c Rib 15 Rivet 16 Damper rubber 17 Armature 32 Reinforcement rib 35 Rivet

Claims (3)

[Claims] Claim 1: An armature support member that is mounted on a rotating shaft through an armature hub, and a fastening member that is fitted into a recess on the outer peripheral side of the armature support member and passes through the armature support member. In an electromagnetic coupling device including a damper rubber that supports the damper so as to be movable in a direction, and an excitation device that magnetically attracts the armature against the elasticity of the damper rubber, the armature support member is formed of reinforced plastic, and the armature An electromagnetic coupling device characterized in that an armature is mounted in contact with a support member. [Claim 2] The armature is pivoted through an armature support member that is mounted on a rotating shaft via an armature hub, and a fastening member that is fitted into a recess on the outer peripheral side of the armature support member and passes through the armature support member. In an electromagnetic coupling device that includes a damper rubber that supports the damper so as to be movable in a direction, and an excitation device that magnetically attracts the armature against the elasticity of the damper rubber, the armature support member is formed of reinforced plastic, An electromagnetic coupling device characterized in that a fastening member for fixing a member to an armature hub passes through a reinforcing rib integrally formed on an armature support member. 3. The electromagnetic coupling device according to claim 1 or 2, wherein the armature support member includes a locking portion in which the outer peripheral portion of the damper rubber comes into contact with the damper rubber recess, and a recess extending from the locking portion to the recess. An electromagnetic coupling device comprising an annular reinforcing rib extending radially inward and provided in a series along the circumferential direction of the concave portion.