JP3260250B2 - Electromagnetic clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch mounted on a compressor for a car air conditioner, and more particularly to an electromagnetic clutch provided with a balancing means for canceling imbalance generated inside the compressor. is there.

[0002]

2. Description of the Related Art Conventionally, an imbalance caused by the structure and operation of an oscillating compressor or the like occurs. Therefore, an imbalance is applied to an electromagnetic clutch having an armature assembly mounted on a rotating shaft of the compressor. A balance weight is configured as a balancing means for canceling. That is, like an electromagnetic clutch for a compressor disclosed in Japanese Patent Publication No. 56-31450, an armature assembly is provided with an armature hub mounted on a rotating shaft of a compressor and a washer attached to a flange portion of the armature hub. A stopper plate fixed via the base end of the leaf spring and being an extension of the flange in the radial direction; and an armature having the free end of the leaf spring fixed and the retracted position restricted by the protrusion of the stopper plate. And a balance weight for canceling the unbalance of the compressor is formed integrally with the stopper plate.

Therefore, when the compressor is driven by magnetically attracting the armature to the rotor which is rotationally transmitted by the V-belt from the drive source, the imbalance generated in the compressor is reduced by providing a balance weight in the armature assembly. As a result, the vibration during driving of the compressor can be suppressed.

An electromagnetic clutch having an armature assembly provided with such a balance weight is disclosed in Japanese Unexamined Utility Model Publication No. Sho 56-125542. Positioning means for determining the relative positional relationship of the balance means by changing the pitch of one of the fitting portions formed by the serration teeth of the rotating shaft or changing the height of the teeth is provided. Then, the operation of mounting the armature assembly on the rotary shaft of the compressor can be efficiently and easily performed.

[0005]

However, a structure in which a balance weight is provided as a balancing means at a portion of a stopper plate which cancels the imbalance of the compressor by a positioning means or at a portion of other members of an armature assembly. Therefore, for example, due to installation conditions such as a small installation space of the compressor in an engine room of an automobile or a mounting of an overhang type pulley on a rotor depending on the installation location of the compressor, unbalance of the compressor may be caused. In some cases, it may not be possible to provide a balance means consisting of sufficient weights to cancel out.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce a dimension in an axial direction and a dimension in a radial direction in an electromagnetic clutch of a damper rubber type provided with balance weights constituting balance means.

[0007]

In order to achieve the above object, an electromagnetic clutch according to the present invention comprises an armature hub mounted on a rotating shaft of a driven device via a positioning means, and a flange of the armature hub. A plurality of through-holes extending in the circumferential direction and formed at intervals in the circumferential direction, a stopper plate having a first balance weight formed therein, a peripheral wall having a through-hole larger than the through-hole, A damper cover comprising a mounting flange portion bent outward from an end of the portion, the damper cover being individually disposed in each through-hole portion of the stopper plate, and the mounting flange portion being fixed to the stopper plate; A damper rubber housed in the inner surface of the outer peripheral surface side and abutting against a peripheral edge of the through hole of the stopper plate, and a head side is fixed to the damper rubber. A torque transmitting member having an end on the opposite side of the head inserted through each through hole of the damper cover and the stopper plate; an armature having a fixed end on the opposite side of the torque transmitting member; And a field core provided with an armature and an exciting coil having the rotor as a magnetic circuit. The mounting flanges of a plurality of adjacent damper covers disposed on the side that cancels out are integrally formed, and the integrated mounting flange is used as a second balance weight for canceling imbalance. The second balance weight is superimposed on the first balance weight.

[0008]

Since the rotation of the driving source, for example, the engine of an automobile, is constantly transmitted to the rotor, when the excitation coil is energized and the armature is magnetically attracted to the rotor, the rotation of the rotor is driven via the armature hub. machine,
For example, it is transmitted to a compressor for a car air conditioner. Further, the imbalance generated by driving the compressor is canceled because the balance weight is provided on the damper cover disposed on the side that cancels the imbalance. Therefore, the compressor does not vibrate greatly. Further, when the power supply to the excitation coil is cut off, the armature is separated from the rotor by the elastic restoring force of the damper rubber and retreats to the side surface of the stopper plate, so that the rotation transmission to the compressor is interrupted.

[0009]

FIG. 1 is a front view of an electromagnetic clutch showing one embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a front view of a stopper plate assembly of FIG. 5 is a front view of the stopper plate of FIG. 2, FIG. 5 is a front view of the damper cover of FIG. 2, and FIG. 6 is a sectional view taken along line BB of FIG.

The electromagnetic clutch indicated generally by reference numeral 1 is used as a power transmission device for transmitting the rotation of an automobile engine to a compressor 2 for a car air conditioner or cutting off the rotation. The cylindrical portion 2a of the compressor 2 has a mounting plate to be described later.
The bearing 3 is fitted through a cylindrical inner peripheral edge of 19 , and the inner ring of the bearing 3 is fixed by a retaining ring locked in a locking groove formed at the tip of the cylindrical portion 2a. . The outer ring of the bearing 3 is press-fitted and fitted to the inside of the rotor 4 which is an annular member having a substantially U-shaped cross section and is prevented from coming off. In the disk portion 4a of the rotor 4 in which a friction surface opposed to a friction surface of an armature 18 described later with a gap is formed, slits 4b and 4c for magnetic flux detour punched by press working are formed on the same circumference. It is formed at an interval above. An armature assembly 1 described later is provided on the outer peripheral surface of the rotor 4.
The cylindrical portion 5a of the pulley 5 formed so as to surround 0 is fitted and fixed by screws. Furthermore, a field core 7 in which the exciting coil 6 is provided is fitted into the annular groove 4d of the rotor 4 so as to form a gap, while the field core 7 is attached to the mounting plate 19 in the drawing. It is attached to the front casing of the compressor 2 by screws that are not provided.

An armature assembly 10 having an armature hub 9 having a shaft hole in which a serration tooth 8a is formed at a tip of a rotary shaft 8 of the compressor 2 and a serration groove 9a into which the serration tooth 8a is fitted is formed. Is mounted on the rotating shaft 8. An annular flange portion 9b is formed integrally with the armature hub 9, and a stopper plate assembly 12 having a stopper plate 11 is integrally fixed to the flange portion 9b with a rivet 13. The stopper plate 11 has a plurality of (five in the embodiment) through holes 11a formed at intervals on the same circumference.
And a projection 11b pressed between these through holes 11a for increasing rigidity, and a first balance weight 1 for canceling imbalance generated inside the compressor 2.
1c is formed. Note that reference numeral 11d denotes rivet 1.
Reference numeral 11e denotes an insertion hole 3 for projecting a damper cover 14 to be described later by welding (see FIG. 4).

A stopper plate 1 having such a shape.
1 has a cylindrical peripheral wall portion 14b formed with a through hole 14a having a diameter larger than the diameter of the through hole 11a of the stopper plate 11, and an annular attachment bent outward from an end of the peripheral wall portion 14b. A plurality of (five in this embodiment) damper covers 14 each including a flange portion 14c are provided. That is, the through hole 1 of the stopper plate 11
A mounting flange portion 14c of the damper cover 14 is welded to the stopper plate 11 so that the center of the through hole 14a of the damper cover 14 coincides with the center of the through hole 11a. The inner surface of the outer peripheral surface of the damper rubber 17 is in contact with the damper rubber 17. Also, the three damper covers 14, which are sides that cancel the imbalance generated inside the compressor 2, are integrally formed with the respective mounting flange portions 14c. It is provided as a second balance weight 15 for canceling the balance (see FIGS. 3, 5, and 6).

In each of the damper covers 14, damper rubbers 17, which are baked and fixed around the head side of a cylindrical torque pin 16 provided as a torque transmitting member, are individually press-fitted and housed. The inner surface of the damper rubber 17 on the outer peripheral surface side is in contact with the peripheral edge of the through hole 11a of the stopper plate 11 so that the movement toward the rotor 4 is restricted. 14 to the through hole 11a of the stopper plate 11.
Through the stopper plate 11 on the side opposite to the damper cover 14 to protrude therefrom.

The distal end of the torque pin 16 on the opposite side of the head is inserted into each stepped hole of an armature 18 having a friction surface axially opposed to the friction surface of the rotor 4 with a predetermined gap G therebetween, and caulking. Due to plastic deformation. And
The torque pin 16 and the armature 18 are fixed integrally, and the armature 18 is supported by the armature assembly 10 by a damper rubber 17 so as to be movable only in the axial direction. Reference numeral 18a is an arc-shaped slit for magnetic flux detour formed by stamping by press working and formed at intervals on the same circumference.

In the electromagnetic clutch 1 of the embodiment having the above-described structure, since the rotation of the automobile engine is constantly transmitted from the pulley 5 to the rotor 4, the armature 18 is connected to the rotor 4 by energizing the exciting coil 6. When magnetically attracted, the rotation of the rotor 4 is transmitted to the compressor 2 via the armature assembly 10. Further, the imbalance generated by driving the compressor 2 is canceled because the first balance weight 11c and the second balance weight 15 are provided on the side where the imbalance is canceled, and the compressor 2 vibrates greatly. There is no such thing. When the excitation coil 6 is turned off, the armature 18 is separated from the rotor 4 by the elastic restoring force of the damper rubber 17 and retreats to the side surface of the stopper plate 11, so that the rotation transmission to the compressor 2 is interrupted. .

In the embodiment of the present invention, the second balance weight 15 constituting the balancing means is provided on the damper cover 14 disposed on the side where the imbalance of the compressor 2 is canceled by the positioning means. However, the design can be freely changed depending on the unbalance amount of the compressor 2, for example, by stacking and fixing another weight member on the weight portion 15 in FIG. Further, in the embodiment, the structure in which the stopper plate 11 is fixed to the flange portion 9b of the armature hub 9 with the rivet 13 is shown.
Is provided as an extension of the flange portion 9b in the radial direction, and the armature hub 9 and the stopper plate 1
1 can be formed integrally.

[0017]

As described in detail above, the electromagnetic clutch according to the present invention has a peripheral wall having a through hole larger than the through hole formed in the stopper plate, and is bent outward from an end of the peripheral wall. And a damper cover which is individually disposed and fixed to each through hole of the stopper plate, and the inner surface of the outer peripheral surface side of the damper rubber housed in the damper cover is provided with a stopper plate. The height of the damper cover can be reduced as compared with, for example, the electromagnetic clutch of Japanese Utility Model Laid-Open No. 4-32327. Therefore, the dimension of the electromagnetic clutch in the axial direction can be reduced.

In addition, since the adjacent damper covers are easily formed integrally from a single steel plate, the mounting flange portion between the adjacent damper covers is provided as a balance weight for canceling imbalance. Therefore, the manufacturing cost can be reduced.

Further, the second balance weight of the damper cover does not increase the first balance weight provided at the portion of the stopper plate which cancels the unbalance of the driven device. Since the weight necessary to cancel the noise can be compensated for, the electromagnetic clutch provided with the balancing means can be provided without designing to increase the size in the radial direction.

[Brief description of the drawings]

FIG. 1 is a front view of an electromagnetic clutch showing one embodiment of the present invention.

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

FIG. 3 is a front view of the stopper plate assembly of FIG. 2;

FIG. 4 is a front view of the stopper plate of FIG. 2;

FIG. 5 is a front view of the damper cover of FIG. 2;

FIG. 6 is a sectional view taken along line BB of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Armature assembly 11 Stopper plate 11c 1st balance weight 14 Damper cover 15 2nd balance weight

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16D 27/10

Claims (1)

(57) [Claims] 1. An armature hub mounted on a rotating shaft of a driven device via positioning means, and a plurality of through holes extending in a flange portion of the armature hub and formed at intervals in a circumferential direction. And a stopper plate having a first balance weight formed therein, a peripheral wall portion having a through hole larger than the through hole, and a mounting flange portion bent outward from an end of the peripheral wall portion. A damper cover which is individually disposed in each through hole portion, and wherein the mounting flange portion is fixed to the stopper plate, and an inner surface on the outer peripheral surface side housed in the damper cover abuts a peripheral edge of the through hole of the stopper plate. The damper rubber and the head side are fixed to the damper rubber, and the tip on the opposite side of the head extends through each of the damper cover and the stopper plate. A torque transmitting member inserted into the hole,
An armature having a fixed end on the opposite side of the head of the torque transmitting member, a rotor facing the armature with a predetermined gap and transmitting rotation on the drive side, and a magnetic circuit including the armature and the rotor. And a field core in which an exciting coil to be mounted is provided, and mounting flange portions of a plurality of adjacent damper covers disposed on the side that cancels the imbalance of the driven device are integrally formed, and the integrated flange portion is formed. An electromagnetic clutch, wherein the mounting flange portion is a second balance weight for canceling unbalance, and the second balance weight is superimposed on the first balance weight.