JP2001241508A - Coupling for electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling which can maintain good actuation and buffering, and more reduce efficiently the vibration or the noise of a compressor by the tortional and the axial vibrations of a rotating shaft. SOLUTION: The coupling comprise a hub 1 installed on a rotating shaft f, an outer ring 2 installed to an armature g which is attached into a rotor b by an actuation of electromagnetic coil a, a main elastomer 3 connecting elastically the hub 1 to the outer ring 2, a sleeve 4 pressed to fit into the rim 13 of the hub 1, a mass part 5 concentrically arranged to the sleeve 4, and a sub elastomer 6 adhered into the distance between the sleeve 4 and the mass part 5. Furthermore, the sub elastomer 6 and the mass part 5 form an adsorption part D, and the natural frequency of the adsorption part D is set into a predetermined frequency range to reduce.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling for transmitting a rotational driving force input from the outside to a rotating shaft and absorbing a torque fluctuation, and is provided, for example, in an electromagnetic clutch of a compressor in a vehicle air conditioner of a vehicle. About what is being done.

[0002]

2. Description of the Related Art In a refrigerating cycle of a vehicle air conditioner for an automobile, an electromagnetic clutch of a compressor for compressing a refrigerant has a structure as shown in FIG. ).

That is, the electromagnetic clutch 100 is arranged so as to surround a non-rotating electromagnetic coil 101, and is rotatably held on the outer periphery of a shaft hole housing 103 of a compressor via a bearing 104. A rotor 102 provided with a pulley 102a, and an armature 106 which is closely opposed to an end face of the rotor 102
And the armature 106 is connected to the shaft hole housing 10.
And a coupling 107 that is connected to the compressor shaft 105 inserted through the shaft 3 so as to be movable in the axial direction.

[0004] A coupling 107 has a hub 107a attached to the outer periphery of a distal end portion of a compressor shaft 105 via a screw member 108, and a plurality of rivets circumferentially arranged on an armature 106 concentrically arranged on the outer periphery of the hub 107a. Outer ring 1 connected via 109
07b, the outer ring 107b and the hub 10
And an elastic body 107c made of an annular rubber-like elastic material that is vulcanized and bonded between the peripheral surfaces facing the rim portion 7a.

When the electromagnetic coil 101 is excited, the coupling 107 allows the armature 106 to move in the axial direction due to the magnetic force and be attracted to the rotating rotor 102 by deformation of the elastic body 107c. When the torque is transmitted from the armature 106 to the compressor shaft 105 and the exciting current to the electromagnetic coil 101 is interrupted, the armature 106 is separated from the end face of the rotor 102 by an axial distance L by the restoring force of the elastic body 107c. It has a function of reducing noise and impact at the time of clutch meeting between the armature 106 and the rotor 102 due to the excitation of 101.

[0006]

By the way, a compressor, especially a swash plate reciprocating type compressor generates torsional vibration having a relatively high frequency. The vibration system having the compressor shaft 105 as a torsion spring and the hub 107a as an inertial mass also has a torsional natural frequency in a relatively high frequency band of about 1000 Hz. Therefore, a problem is pointed out that this vibration system causes torsional resonance in a high frequency band and increases vibration and noise of the compressor.

On the other hand, the coupling 107 having the conventional structure is
The axial operability of the armature 106 when the electromagnetic coil 101 is energized is improved, and the armature 106 is attracted to the end face of the rotor 102 so that the compressor shaft 1
From the viewpoint of reducing the torsional impact when the transmission of the torque to the elastic member 107 is started, it is necessary to set the spring constants of the elastic body 107c in the axial direction and the torsional direction to be somewhat low. For this reason, the elastic body 107c is a torsion spring and the armature 10c
The natural frequency in the torsional direction of the system having the inertia mass of the rotor 6 and the rotor 102 is in a relatively low frequency band, and therefore a dynamic vibration absorbing effect of effectively reducing the vibration generated from the compressor cannot be expected.

The compressor shaft 105 also receives an exciting force in the axial direction. In this case, the compressor shaft support system is a spring, and the compressor shaft 105, the hub 107a, the swash plate (not shown), and the like have an inertial mass. Although the system resonates, the conventional coupling 107 cannot expect an anti-vibration effect against such axial vibration.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its main technical problems the provision of good operability and cushioning during clutch operation.
An object of the present invention is to make it possible to effectively reduce vibration and noise of a compressor due to vibration in the torsional direction and the axial direction of a rotating shaft.

[0010]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, the electromagnetic clutch coupling according to the present invention includes a hub attached to a rotating shaft, an outer ring attached to an armature attracted to a rotor by excitation of an electromagnetic coil, and the hub and the outer ring on the outer peripheral side thereof. A main elastic body made of a rubber-like elastic material elastically connected; a sleeve press-fitted to the rim portion of the hub; an annular mass member concentrically arranged with the sleeve; And a sub-elastic body made of a rubber-like elastic material adhered therebetween. The sub-elastic body and the mass member constitute a dynamic vibration absorber, and the natural frequency in the torsional direction and the axial direction is set to a predetermined frequency band to be reduced, thereby reducing the frequency in the frequency band. It exhibits a dynamic vibration absorbing effect by resonance.

In the present invention, the main elastic body may have a structure in which the main elastic body is bonded between the outer ring and the sleeve to which the sub elastic body is bonded, or the sub elastic body may be bonded to the rim portion of the hub, If the main elastic member and the sub-elastic member made of rubber-like elastic material can be simultaneously molded and adhered by adopting a structure in which the mass member is press-fitted to the sub-elastic member, it can be manufactured at low cost.

[0012]

FIG. 1 shows a first embodiment of a coupling for an electromagnetic clutch according to the present invention, together with a part of an electromagnetic clutch in a compressor of a vehicle interior air conditioner. The electromagnetic clutch shown in FIG. 1 basically has the same configuration as that shown in FIG. 5 described above.

That is, reference numeral a in FIG. 1 denotes a non-rotating electromagnetic coil, and reference numeral b denotes a rotor made of a magnetic material disposed so as to surround the electromagnetic coil a and integrally provided with a pulley c on the outer periphery. is there. The rotor b is rotatably held on the outer periphery of a shaft hole housing d of the compressor via a bearing e. A compressor shaft f for operating a refrigerant compression mechanism (not shown) in the compressor is rotatably inserted through the inner periphery of the shaft hole housing d. Reference numeral g denotes a disk-shaped armature made of a magnetic material, which is disposed so as to face and close to the end face of the rotor b, and is provided on the outer peripheral side of the distal end portion of the compressor shaft f protruding from the outer end opening of the shaft hole housing d. , Via the coupling j of the present invention so as to be axially displaceable.

The coupling j is a hub 1 attached to a distal end of the compressor shaft f via a screw member h.
An outer ring 2 attached to an armature g of an electromagnetic clutch; a main elastic body 3 for elastically connecting the hub 1 and the outer ring 2;
A sleeve 4 press-fitted on the inner peripheral surface of the sleeve 3; an annular mass member 5 concentrically disposed on the inner peripheral side of the sleeve 4;
A secondary elastic body (6) elastically connects the sleeve (4) and the mass member (5).

The hub 1 has an inner peripheral boss portion 11 fixed to the compressor shaft f, a disk portion 12 extending from the inner peripheral portion to the outer peripheral side and reaching the front side of the armature g, and a side opposite to the armature g from the outer peripheral end. And a rim 13 extending in the axial direction. On the other hand, the outer ring 2 has a plurality of flanges 2a in the circumferential direction fixed to the outer peripheral portion of the armature g via rivets i, and the outer peripheral side of the rim portion 13 of the hub 1 from the base of the flange 2a is opposite to the armature g. And a cylindrical main body 2b extending toward the side. Main elastic body 3
Is formed of a rubber-like elastic material, and is vulcanized and bonded to the outer peripheral surface of the rim portion 13 and the inner peripheral surface of the cylindrical main body portion 2b of the outer ring 2 radially opposed thereto. .

An armature g is provided on the inner peripheral portion of the main elastic body 3.
An elastic ridge 3a extending in an arc shape protruding toward the side is formed intermittently in the circumferential direction, and is vulcanized and bonded to the rear surface of the outer peripheral portion of the disk portion 12 in the hub 1. This elastic ridge 3a
When the armature g is held at a position separated from the end face of the rotor b by the axial distance L by the elasticity of the main elastic body 3, the armature g comes into pressure contact with the end face of the armature g opposite to the rotor b. I have.

The sub-elastic body 6 is formed of a rubber-like elastic material, and is vulcanized and bonded between opposing peripheral surfaces of the sleeve 4 and the mass member 5 arranged concentrically on the inner peripheral side. The sleeve 4, the sub-elastic body 6, and the mass member 5 form a dynamic vibration absorbing portion D. The dynamic vibration absorbing portion D is housed in the inner peripheral space of the rim portion 13 by press-fitting the sleeve 4 on the inner peripheral surface of the rim portion 13 of the hub 1, and the mass member 5 The torsional and axial shearing of the body 6 causes the hub 1
Relative to the torsion direction and the axial direction.

The natural frequency of the dynamic vibration absorber D in the torsional direction is determined by the torsion spring constant of the auxiliary elastic body 6 and the inertial mass of the mass member 5 in the torsional direction. The frequency is set to, for example, around 1000 Hz in synchronization with the natural frequency in the torsional direction of the vibration system. The axial natural frequency of the dynamic vibration absorbing portion D is determined by the axial inertial mass of the auxiliary elastic body 6 and the axial shearing spring constant of the mass member 5 so that the compressor shaft supporting system becomes a spring, the compressor shaft f, the hub 1 and a swash plate (not shown) are set in synchronization with the natural frequency of a vibration system having an inertial mass.

In the manufacture of the coupling j, the rim 13 of the hub 1 and the cylindrical main body 2b of the outer ring 2 concentrically arranged on the outer peripheral side thereof are opposed to each other in a mold (not shown). By coupling the main elastic body 3 by vulcanization molding and vulcanization between the peripheral surfaces, a coupling main body is manufactured. On the other hand, in another mold (not shown), the secondary elastic body 6 is vulcanized and vulcanized and bonded between the peripheral surface of the sleeve 4 and the mass member 5 concentrically arranged on the inner peripheral side thereof. By doing so, a bush-shaped dynamic vibration absorbing portion D is manufactured. Then, the sleeve 4 of the dynamic vibration absorbing portion D is press-fitted onto the inner peripheral surface of the rim portion 13 with an appropriate interference.

Next, the operation of the coupling j of the present embodiment configured as described above will be described together with the operation of the electromagnetic clutch.

First, the rotor b is rotated by a driving force from a crank pulley or the like of an engine via a belt (not shown) wound around a pulley c. When an exciting current is supplied to the electromagnetic coil a from the state shown in FIG. 1, the armature g is axially displaced toward the rotor b with the axial elastic shear deformation of the main elastic body 3 due to the magnetic force. It is adsorbed on the end face and becomes a clutch meet state. At that time, the rotational torque of the rotor b is transmitted from the armature g to the compressor shaft f via the outer ring 2, the main elastic body 3, and the hub 1 of the coupling j, and the compressor (and, consequently, the air conditioner) is brought into an operating state. .

At this time, the clutch meet sound when the armature g is attracted to the end face of the rotor b and the shock caused by the sudden input of the rotational torque of the rotor b to the armature g at this time have a low spring constant. Effective relaxation is achieved by the shear deformation of the main elastic body 3 in the torsional direction.

When the supply of the exciting current to the electromagnetic coil a is interrupted from the compressor operating state in which the armature g is attracted to the rotor b, the armature g is moved by the elastic restoring force of the main elastic body 3. Then, the operation returns to the state shown in FIG. Therefore, the rotor b
, The transmission of the rotational torque via the armature g and the coupling j is interrupted, and the rotation of the compressor shaft f is stopped. At this time, the armature g that has been returned does not come into metallic contact with the back surface of the hub 1 and is buffered by the elastic ridges 3a of the main elastic body 3, so that generation of noise is prevented.

As described above, in the operating state of the compressor, the torsional vibration system having the compressor shaft f as the torsion spring and the hub 1 as the inertial mass receives the torsional vibration of the compressor shaft f, and thus, relatively. It resonates in a high frequency band, and its vibration level usually reaches a maximum near 1000 Hz, as shown by the dashed line in FIG.
However, in this resonance region, the dynamic vibration absorbing portion D having the auxiliary elastic body 6 as a torsion spring and the mass member 5 as an inertial mass resonates in a phase opposite to the torsional vibration input from the vibration system, and the dynamic vibration absorbing section D dynamically moves. Exhibits vibration absorption effect. That is, the dynamic vibration absorber D
Since the direction of the torque due to the torsional resonance is opposite to the direction of the torque of the input vibration, the peak of the vibration level is reduced as shown by the solid line in FIG. 2, and the vibration and noise of the compressor can be effectively reduced. .

The compressor shaft f also receives an exciting force in the axial direction. In this case, the compressor shaft supporting system is a spring, and the compressor shaft f, the hub 1, a swash plate (not shown) and the like have an inertial mass. Although the system resonates, the dynamic vibration absorber D composed of the sub elastic body 6 and the mass member 5
Since its natural frequency in the axial direction is set in the resonance frequency band, the dynamic vibration absorption effectively reduces the axial vibration.

Next, FIG. 3 shows a second embodiment of the coupling j for an electromagnetic clutch according to the present invention in an unmounted state. In the coupling j according to this embodiment, the auxiliary elastic body 6 in the dynamic vibration absorbing portion D is vulcanized and bonded to the inner peripheral surface of the rim portion 13 in the hub 1 and the rim portion 13
Is formed continuously with the main elastic body 3 on the outer peripheral side via the rubber film part 3b attached to the edge of the main elastic body 3, and the mass member 5 in the dynamic vibration absorbing part D Press fit. The configuration of the other parts is basically the same as that of the first embodiment shown in FIG.

The inner peripheral surface of the rim portion 13 of the hub 1 is formed with a curved groove 13a that is continuous in the circumferential direction, and the outer peripheral surface of the mass member 5 is located at a position corresponding to the groove 13a. ,
A curved ridge 5a that is continuous in the circumferential direction is formed. For this reason, the auxiliary elastic body 6 is interposed between the rim portion 13 and the mass member 5 in a state of meandering in the radial direction by the groove 13a and the ridge 5a. It does not fall off.

Coupling j according to the second embodiment
Also, the provision of the dynamic vibration absorbing portion D in the hub 1 basically provides the same operation and effect as those of the first embodiment shown in FIG. In manufacturing the coupling j, vulcanization molding of the main elastic body 3 between the rim portion 13 of the hub 1 and the cylindrical main body portion 2b of the outer ring 2 concentrically arranged on the outer peripheral side thereof is performed. Vulcanization bonding and the rim 1
The vulcanization molding and vulcanization bonding of the secondary elastic body 6 to the inner peripheral surface of the third elastic member 3 can be performed simultaneously in one mold. For this reason, the vulcanization process does not increase by providing the dynamic vibration absorbing portion D, and only one mold device is required, and the device can be manufactured at low cost.

Next, FIG. 4 shows a third embodiment of the coupling j for an electromagnetic clutch according to the present invention in an unmounted state. The coupling j according to this embodiment is configured such that the rim portion 13 of the hub 1 is oriented in the opposite direction to the first and second embodiments, that is, the armature g shown in FIG.
Looking to the side. The sleeve 4 fixed to the rim portion 13 includes an inner peripheral sleeve 4a press-fitted on the inner peripheral surface of the rim portion 13 and a bent portion 4c that bypasses the edge of the rim portion 13 from one end thereof. And an outer peripheral sleeve 4b formed so as to be folded back to the outer peripheral side.

The main elastic body 3 for elastically connecting the hub 1 and the outer ring 2 includes an outer peripheral surface of the outer peripheral sleeve 4b of the sleeve 4 and an outer peripheral surface of the outer ring 2 concentrically arranged on the outer peripheral side. The auxiliary elastic body 6 constituting the dynamic vibration absorbing portion D is concentrically arranged on the inner peripheral surface of the inner peripheral sleeve 4a of the sleeve 4 and on the inner peripheral side thereof. It is vulcanized and bonded to the outer peripheral surface of the mass member 5. The main elastic body 3 and the sub elastic body 6
Are formed continuously with each other via an elastic ridge 3a formed along the bent portion 4c of the sleeve 4.

The coupling j according to this embodiment basically has the same operation and effect as those of the first and second embodiments. Further, according to this configuration, the dynamic vibration absorbing portion D including the mass member 5 and the sub elastic body 6 is
Is protected from the outside because it is housed in a space facing the armature g side of the inner circumference of the rim portion 13 in the above, and even if the auxiliary elastic body 6 is damaged, the mass member 5 may jump out. Absent.

The outer ring 2, the main elastic body 3, the sleeve 4, the auxiliary elastic body 6, and the mass member 5 constitute an integral vulcanized molded product. The outer ring 2, the sleeve 4, and the mass member 5 are set concentrically, and the main elastic body 3 and the sub elastic body
Can be obtained in a single vulcanization step by vulcanization molding (vulcanization bonding) at the same time. Then, the outer peripheral surface of the inner peripheral sleeve 4a of the sleeve 4 in this molded product is press-fitted to the inner peripheral surface of the rim portion 13 of the hub 1 with an appropriate interference so that the coupling j in the form of FIG. Assembled. Therefore, the configuration of this embodiment can also be manufactured at low cost.

[0033]

According to the coupling for an electromagnetic clutch according to the present invention, the main elastic body provides good clutch operability due to magnetic attraction of the armature and a function of reducing impact and noise during clutch meet. Since the dynamic vibration absorber has a function of reducing resonance in the torsional direction and the axial direction of the rotating shaft, vibration and noise of the compressor can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a coupling for an electromagnetic clutch according to the present invention, together with a part of the electromagnetic clutch, cut along a plane passing through an axis.

FIG. 2 is an explanatory view showing a vibration reduction effect according to the present invention.

FIG. 3 is a cross-sectional view showing a second embodiment of the electromagnetic clutch coupling according to the present invention, cut along a plane passing through an axis.

FIG. 4 is a cross-sectional view showing a third embodiment of the electromagnetic clutch coupling according to the present invention, cut along a plane passing through an axis.

FIG. 5 is a cross-sectional view showing a coupling for an electromagnetic clutch according to the related art cut along a plane passing through an axis together with a part of the electromagnetic clutch.

[Explanation of symbols]

 a electromagnetic coil b rotor c pulley d shaft hole housing e bearing f compressor shaft (rotating shaft) g armature h screw member i rivet j coupling D dynamic vibration absorbing part 1 hub 11 boss part 12 disk part 13 rim part 13a groove 2 outer Ring 2a Flange 2b Cylindrical main body 3 Main elastic body 3a Elastic ridge 4 Sleeve 4a Inner peripheral sleeve 4b Outer sleeve 4c Bend 5 Mass member 5a ridge 6 Secondary elastic body

Claims (3)

[Claims] 1. A hub (1) attached to a rotating shaft (f), an outer ring (2) attached to an armature (g) attracted to a rotor (b) by excitation of an electromagnetic coil (a), A main elastic body (3) made of a rubber-like elastic material for elastically connecting the hub (1) and the outer ring (2) on the outer peripheral side thereof; and a press fitting fit to a rim (13) of the hub (1). A sleeve (4) attached, an annular mass member (5) concentrically arranged with the sleeve (4), and a rubber-like elastic material bonded between the sleeve (4) and the mass member (5). A coupling for an electromagnetic clutch, comprising: 2. A sleeve (4) in which a main elastic body (3) is bonded to an outer ring (2) and a sub elastic body (6).
The coupling for an electromagnetic clutch according to claim 1, wherein the coupling is bonded to the coupling. 3. An outer ring (2) attached to an armature (g) attracted to a rotor (b) by excitation of an electromagnetic coil (a), wherein the hub (1) is attached to a rotating shaft (f). A main elastic body (3) made of a rubber-like elastic material elastically connecting the hub (1) and the outer ring (2) on the outer peripheral side thereof; and a rim portion (13) of the hub (1) is vulcanized. A coupling for an electromagnetic clutch, comprising: a sub-elastic body (6) made of a bonded rubber-like elastic material; and an annular mass member (5) press-fitted to the sub-elastic body (3).