JP2002106602A - Electromagnetic clutch and gas compressor fitted with this electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise produced by the resonance of attraction/separation sound with a pulley when an armature of an electromagnetic clutch is attracted to/separated from the side surface of the pulley. SOLUTION: The pulley 52 is composed of two or more components (52E, 52M), and these components are fixed by press fitting, shrink fitting, or interposing between elastic members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch and a gas compressor equipped with the electromagnetic clutch.

[0002]

2. Description of the Related Art In a vane-type gas compressor used in a car air conditioner or the like, rotational power is transmitted from a crankshaft pulley of an engine to a rotor shaft 40 via a belt 60 and an electromagnetic clutch 50 as shown in FIG. Is transmitted.

The electromagnetic clutch 50 includes a ring-shaped electromagnet 51, a driving pulley 52 for passing the magnetic flux of the electromagnet 51, a bearing 53 for rotatably holding the driving pulley 52 concentrically with the electromagnet 51, A driven armature plate 54 is attracted to the end face 52a of the driving pulley 52 by the magnetic flux.

During the rotation of the engine, the driving pulley 52 is constantly driven to rotate by the belt 60.

[0005] In FIG. 4, the gas compressor 1 includes:
In addition to the above, a rotor 41 integral with the rotor shaft 40 and a vane 42 rotating in the cylinder chamber 2 while sliding in a radial groove of the rotor 41 are provided.
1. The gas in the cylinder chamber 2 is compressed by the rotation of the vane 42.

[0006] The compressed gas is discharged into the discharge chamber 3,
The air is sent from the discharge port 3a to a piping system such as a car air conditioner (not shown), returns to the suction chamber 4 from the suction port 4a, and is sucked into the cylinder chamber 2 again.

The electromagnet 51 of the electromagnetic clutch 50 is fixed to a front cover (frame) 5 of the gas compressor 1, and the driving pulley 52 is connected to the frame 5 of the gas compressor 1.
It is rotatably held concentrically with the electromagnet 51 via a bearing 53.

When the gas compressor 1 is operated, the electromagnet 51 of the electromagnetic clutch 50 is energized to drive the driving pulley 52.
The driving pulley 52 and the rotor shaft 40 are coupled by attracting the driven armature plate 54 to the end surface 52a of the end surface 52a, whereby the rotor shaft 40 rotates.

When the operation of the gas compressor 1 is stopped, the energization of the electromagnet 51 is cut off. The driven armature plate 54 is separated from the end face 52a of the driving pulley 52 by a spring (not shown), and the driven armature plate 54 and the rotor shaft 40 are stopped after the rotational power is cut off.

When the electromagnetic clutch 50 is started, a collision sound is generated when the driven armature plate 54 is attracted to the end face 52a of the driving pulley 52. Also, at the time of separation, an operation sound of the driven armature plate 54 is generated. These sounds are transmitted to the outside, and become relatively insignificant in a relatively quiet environment such as when the engine is idling. One of the causes of noise is that the natural frequency possessed by the electromagnetic clutch amplifies the above-mentioned collision sound and operating sound of the electromagnetic clutch, which may cause vibration and noise of the air conditioning system. Can be

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide an electromagnetic clutch in which noise generated by the electromagnetic clutch is reduced, and a gas compressor equipped with the electromagnetic clutch.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a ring-shaped electromagnet, a pulley through which the magnetic flux of the electromagnet passes, and a rotatable concentric rotation of the pulley with the electromagnet. An electromagnetic clutch having a bearing to be held and a driven armature plate attracted to the end face of the pulley by the magnetic flux, or a gas compressor using the electromagnetic clutch, or a pulley to which vibration is applied, such as a pulley, The pulley is formed by press-fitting, shrink-fitting, or fixing an elastic member between two or more ring-shaped portions having the central axis as the central axis.

The press-fit, shrink fit, or hammer-eye surface sandwiching the elastic member is not completely integrated, even when tightly fitted as in press-fit, shrink fit, and is microscopic. When the external force is applied to this hammer-eye surface, the ring-shaped portion tends to move relatively, and Coulomb friction is generated on the hammer-eye surface.

The instantaneous shock vibration generated by the attraction / detachment of the driven armature by turning on / off the electromagnet of the electromagnetic clutch is also transmitted to the driving pulley, and the ring-shaped portion is pressed into the ring-shaped portion. Thus, a force for relative vibration is applied, and Coulomb friction is generated there.
When an elastic member is interposed between the elastic members, elastic deformation vibration of the elastic member itself also occurs. These Coulomb friction and elastic deformation vibration have the function of a dynamic vibration absorber and attenuate vibration energy. This dynamic vibration absorbing effect is effective not only for instantaneous shock vibration caused by ON / OFF of the electromagnetic clutch but also for steady vibration.

[0015]

Embodiments of the present invention will be described below.
This will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an electromagnetic clutch part of a gas compressor according to an embodiment of the present invention. In FIG. 1, an electromagnetic clutch 50 includes a ring-shaped electromagnet 51.
And a driving pulley 52 for passing the magnetic flux of the electromagnet 51
A bearing 53 for rotatably holding the driving pulley 52 concentrically with the electromagnet 51; and a driven armature plate 5 attracted to the end face 52a of the driving pulley 52 by the magnetic flux.
And 4.

The driving pulley 52 is wound around a belt 60 and is constantly rotating. The driven armature plate 54
It is connected to the rotor shaft 40 and does not rotate when the operation of the gas compressor is stopped.

The electromagnetic clutch 50 allows the magnetic flux to pass through the driving pulley 52 and the driven armature plate 54 by excitation of the electromagnet 51, attracts the driven armature plate 54 to the end surface 52 a of the driving pulley 52, and rotates the belt 60. By transmitting the power to the rotor shaft 40 and stopping the excitation of the electromagnet 51, the driven armature plate 54 is separated from the end surface 52 a of the driving pulley 52 by a spring force, and
Cut off the transmission of rotational power to the motor.

The above configuration and operation are the same as those of a conventional gas compressor using an electromagnetic clutch.

Since the operation of attracting and releasing the driven armature plate 54 is rapid, the sound of collision with the driving pulley end surface 52a,
The driven armature plate 54 emits a vibration sound or the like at the time of operation, and resonates in the electromagnetic clutch 50 to increase its level.

Next, the driving pulley 52 which is a feature of the present invention will be described.

The driving pulley 52 is provided with two ring-shaped portions centered on the central axis C--C, that is, the end face 52a, and the electromagnet 51 is concentrically formed in the annular concave portion 52b while maintaining an appropriate gap. The first ring-shaped portion 5 which is housed and held by the bearing 53 and attracts the driven armature plate 54
2M, and a pulley portion (second ring-shaped portion) 52E around which the belt 60 around the outer periphery is wound.

The first ring-shaped portion 52M and the second ring-shaped portion 52E have a hammer-eye surface 7 on which the first ring-shaped portion 52M is expanded by heating the second ring-shaped portion 52E. It is integrated by shrink fit which is inserted into the hole of the second ring-shaped portion 52E, cooled to room temperature and fixed. Therefore, the first ring-shaped portion 52M and the second ring-shaped portion 52E do not rotate relative to each other with a normal use torque of the pulley. Instead of shrink fitting, it may be integrated by press-fitting with less shrinking than in shrink fitting.

The first ring-shaped portion 52M and the second
As the material of the ring-shaped portion 52E, the same kind of steel was used. In addition, each function (the first ring-shaped portion 52M
, And a different type of material can be used as long as there is no significant difference in the coefficient of thermal expansion.

When the electromagnetic clutch 50 is turned on / off, when the first ring-shaped portion 52M of the driving pulley attracts or detaches the driven armature plate 54, a collision sound is generated on the driven armature plate 54 and the ring-shaped portion 52M. And generate vibrations such as vibration sounds.

The second ring-shaped portion 52E is restrained by the belt 60 wound around
It is difficult to respond to vibrations from the outside, and this vibration tends to generate Coulomb friction on the hammer-eye surface 7. Then, the Coulomb friction of the hammer-eye surface 7 acts as a dynamic vibration absorber to reduce a collision sound, a vibration sound and the like. Therefore, the level of vibration and noise leaking outside the gas compressor is reduced.

FIG. 2 is a longitudinal sectional view of an electromagnetic clutch part of a gas compressor according to another embodiment of the present invention. FIG.
In FIG. 7, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 2, the ring-shaped portion of the driving pulley 52 has a pulley portion 52P around which the belt 60 can be wound.
And a ring made of a tungsten-containing sintered material or the like having a higher specific gravity than other members constituting the driving pulley (that is, the pulley portion 52P) fitted into a concave ring provided on the inner peripheral portion of the pulley portion 52P. The two shafts 52H are press-fitted and fixed at a squeezing portion 7A at the hooking portion 7A, and their central axes coincide with the central axis CC of the driving pulley. Also in the case of FIG. 2, shrink fit may be adopted instead of press fitting.

Although the volume of the ring 52H is relatively small, it is difficult to respond to the vibration from the hammer-eye portion 7A due to its large mass, and this vibration tends to generate Coulomb friction on the hammer-eye surface 7A. Accordingly, similarly to the case of FIG. 1, the Coulomb friction of the squeeze-eye surface 7A acts as a dynamic vibration absorber to reduce a collision sound, a vibration sound, and the like. Therefore, the level of vibration and noise leaking outside the gas compressor is reduced.

FIGS. 3A and 3B are longitudinal sectional views showing a pulley of an electromagnetic clutch for a gas compressor according to another embodiment of the present invention.

In FIG. 3, a ring 52H made of a tungsten-containing sintered material having a large specific gravity is fixed to a pulley with an elastic member interposed therebetween without being pressed or shrink-fitted.

In FIG. 3A, the peripheral surface 8 of the concave ring portion provided on the inner peripheral portion of the pulley portion (ring-shaped portion) 52Q is formed as a reverse tapered surface slightly expanding toward the back side. The rubber (elastic member) 9 is poured into a relatively large gap provided between the ring 8 and the outer peripheral surface of the ring 52H to fix the pulley 52Q and the ring 52H. Note that, instead of pouring the rubber 9, it is also possible to insert and fix the rubber ring by sandwiching it.

Further, an adhesive may be applied to the inner and outer peripheral surfaces of the rubber ring for fixing.

In FIG. 3B, the concave ring portion 10 provided on the inner peripheral portion of the pulley portion (ring-shaped portion) 52R has a relatively large gap with the ring 52H in the radial direction and the axial direction. The pulley portion 52R and the ring 52H are fixed by pouring a rubber (elastic member) 9A therebetween. Instead of pouring the rubber 9A, the rubber 9A may be pressed and fixed with a rubber L-shaped cross section interposed therebetween. Alternatively, an adhesive may be applied to the surface of the rubber L-shaped ring to fix the ring.

The rubbers 9 and 9A can be replaced with a synthetic resin or the like having appropriate elasticity.

In the case of FIG. 3, when vibration is transmitted to the squeeze eye surface, the ring 52H having a large specific gravity is unlikely to respond, and the elastic members 9 and 9A expand and contract to absorb vibration and noise.

In each of the above-described embodiments, the case has been described in which there are two ring-shaped portions constituting the pulley. However, in the present invention, the pulley is constituted by three or more ring-shaped portions, and the pulley portion is formed by two. The above can also be applied. When the number of the squirrel-eye portions is two or more, there is a deviation in the vibration absorption frequency characteristics of the respective squirrel-eye portions, so that it can be expected to exhibit an attenuation effect on vibrations and noises in a wider range of frequencies.

[0038]

As described above in detail, according to the present invention, two or more ring-shaped portions having the central axis of the driving pulley as a central axis are press-fitted, shrink-fitted, or fixed with an elastic member interposed therebetween. To form a driving pulley.
Vibration generated due to shrink fit, Coulomb friction of the squeezed eye surface sandwiching the elastic member or elastic deformation of the elastic member was absorbed, and vibration and noise could be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part showing another embodiment of the present invention.

FIGS. 3 (a) and 3 (b) are longitudinal cross-sectional views of a main part showing another embodiment of the present invention, respectively.

FIG. 4 is a longitudinal sectional view showing a general gas compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas compressor 5 Front cover (frame) 7, 7A Saddle-eye surface 9, 9A Elastic member 40 Rotor shaft 50 Electromagnetic clutch 51 Electromagnet 52 Driving pulley 52E Pulley portion (ring-shaped portion) 52H Ring-shaped portion of a material having a large specific gravity 52M ring -Shaped part 52P Pulley part (ring-shaped part) 52Q Pulley part (ring-shaped part) 53 Bearing 54 Driven armature plate 60 Belt

Claims (8)

[Claims] 1. A ring-shaped electromagnet, a driving pulley for passing a magnetic flux of the electromagnet, a bearing for rotatably holding the driving pulley concentrically with the electromagnet, and being attracted to an end face of the driving pulley by the magnetic flux. An electromagnetic clutch having a driven armature plate, wherein two or more ring-shaped portions having the central axis of the driving pulley as a central axis are press-fitted, shrink-fitted, or fixed with an elastic member interposed therebetween to form a driving pulley. An electromagnetic clutch, characterized in that: 2. The method according to claim 1, wherein one of the ring-shaped portions is a pulley portion around which a belt is wound.
Electromagnetic clutch as described. 3. The electromagnetic clutch according to claim 1, wherein one of said ring-shaped portions is made of a material having a higher specific gravity than other members constituting a driving pulley. 4. A gas compressor for compressing gas by transmitting rotational power to a rotor shaft via a belt and an electromagnetic clutch from the outside, wherein the rotor shaft is connected to a driven armature plate of an electromagnetic clutch, and Is wound around a driving pulley of an electromagnetic clutch, and the driving pulley is rotatably held on a frame via a bearing. In a gas compressor, two or more ring-shaped portions having a central axis of the driving pulley as a central axis. Wherein the driving pulley is formed by press-fitting, shrink-fitting, or fixing an elastic member therebetween. 5. The apparatus according to claim 4, wherein one of the ring-shaped portions is a pulley portion around which a belt is wound.
A gas compressor as described. 6. A pulley to which vibration is applied, wherein at least two ring-shaped portions having a central axis of the pulley as a central axis are press-fitted, shrink-fitted, or fixed with an elastic member interposed therebetween. Pulley. 7. One of the ring-shaped portions is a pulley portion around which a belt is wound.
Pulley described. 8. The pulley according to claim 6, wherein one of said ring-shaped portions is made of a material having a higher specific gravity than other members constituting a driving pulley.