JP2001124111A - Coupling for electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reducing function to the noise and the impact at the clutch meet, and the axial operatability of an armature by effectively reducing the torsional vibration of a rotary shaft. SOLUTION: This coupling 7 comprises a spring 71 mounted on a compressor shaft 5, an outer ring 72 mounted on an armature 6, an annular mass member 73 mounted in between the hub 71 and the outer ring 72, a first elastic body 74 elastically connecting the hub 71 and the mass member 73, and a second elastic body 75 for elastically connecting an outer ring 72 and the mass member 73. Relatively, the first elastic body 74 has high spring constant, and the second elastic body 75 has low spring constant. The first elastic body 14 of high spring constant is used as a torsional spring, and a torsional direction natural frequency of a torsion damper system D applying the mass member 73 as inertial mass is determined corresponding to the torsional direction natural frequency of a vibrating system applying the compressor shaft 5 as the torsional spring, and the hub 71 and a boss member 77 as inertial mass.

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 more particularly, to a coupling provided in an electromagnetic clutch in a vehicle air conditioner of a vehicle. About.

[0002]

2. Description of the Related Art An electromagnetic clutch of a compressor for compressing a refrigerant in a refrigeration cycle of a vehicle air conditioner of an automobile is provided by:
Conventionally, for example, it has a structure as shown in FIG. 3 (see, for example, Japanese Utility Model Laid-Open No. 62-167936).

That is, the electromagnetic clutch 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. 10
2a, a rotor 102a, an armature 106 closely opposed to an end face of the rotor 102, and a cup for connecting the armature 106 to a compressor shaft 105 inserted through the shaft hole housing 103 so as to be movable in the axial direction. And a ring 107.

[0004] A coupling 107 is provided with a hub 107a attached to the outer periphery of the distal end of the compressor shaft 105.
And an outer ring 107b concentrically arranged on the outer peripheral side of the hub 107a and connected to the armature 106 via a plurality of rivets 108 in the circumferential direction, and between an opposing peripheral surface of the outer ring 107b and the hub 107a. Elastic body 107c made of an annular elastomer that has been vulcanized and bonded.
And When the electromagnetic coil 101 is excited, the coupling 107 rotates the rotating rotor 10.
2 and a function of transmitting torque from the armature 106 adsorbed to the compressor shaft 105 to the armature 106 when the exciting current to the electromagnetic coil 101 is cut off.
Has a function of urging the armature 106 away from the end face of the rotor 102 by an axial distance L, and a function of reducing noise and impact at the time of clutching the armature 106 with the rotor 102 due to excitation of the electromagnetic coil 101. is there.

[0005]

In the electromagnetic clutch of a compressor, the natural frequency in the torsional direction of a vibration system having a compressor shaft 105 as a torsion spring and a hub 107a as an inertial mass is usually about 1000 Hz. Since a swash plate reciprocating compressor generates torsional vibration having a relatively high frequency, a vibration system including the compressor shaft 105 and the hub 107a resonates at around 1000 Hz, which causes a problem of increasing the vibration and noise of the compressor.

However, the conventional coupling 107 is
The operability of the armature 106 when the electromagnetic coil 101 is energized is improved, and the armature 106
From the viewpoint of reducing the torsional impact when the torque is transmitted to the compressor shaft 105 by being attracted to the end surface of the elastic member 107, it is necessary to set the elastic constants of the elastic body 107c in the axial direction and the torsional direction to be lower to some extent. For this reason, the torsional natural frequency of the auxiliary vibration system in which the elastic body 107c is a torsion spring and the armature 106 and the rotor 102 are inertial masses is low, and the compressor shaft 105 and the hub 10
It is pointed out that the resonance at around 1000 Hz of the vibration system 7a cannot be effectively reduced by the dynamic vibration absorbing action of the auxiliary vibration system.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its technical object to ensure good operability and cushioning during the operation of a clutch, and to provide a rotary shaft and a hub. An object of the present invention is to make it possible to effectively reduce compressor vibration and noise due to resonance of a vibration system.

[0008]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, the coupling for the electromagnetic clutch according to the present invention includes an armature opposed to a rotor surrounding the electromagnetic coil and attracted to the rotor by excitation of the electromagnetic coil, and a rotating shaft side concentrically arranged with the rotor. A hub interposed between the hub and the rotating shaft, an outer ring concentrically arranged on the outer peripheral side of the hub and attached to the armature side, and a mass member arranged between the hub and the outer ring, A first elastic body made of an elastomer elastically connecting the hub and the mass member; and an elastomer having a relatively lower spring constant than the first elastic body and elastically connecting the outer ring and the mass member. And a second elastic body made of

According to the above configuration, since the second elastic body that connects the outer ring fixed to the armature to the hub through the mass member and the first elastic body has a low spring constant, When an exciting current is applied to the coil, the armature is easily attracted to the rotor by the magnetic force, and the torsional impact load generated by torque transmission from the rotor when the armature and the rotor are attracted is effectively reduced.

Since the first elastic body has a relatively high spring constant, the mass member can constitute a sub-vibration system having a high natural frequency in the torsional direction. For this reason, vibration and noise due to resonance in a high frequency range of a vibration system having a rotary shaft as a torsion spring and a hub as an inertial mass are effectively reduced by the dynamic vibration absorbing action of the sub-vibration system.

[0011]

FIG. 1 shows a typical 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 cabin air conditioner. Numeral 2 indicates the coupling of this embodiment alone. The electromagnetic clutch shown in FIG. 1 basically has the same configuration as that of FIG. 3 described above, that is, reference numeral 1 denotes a non-rotating electromagnetic coil, and reference numeral 2 denotes this electromagnetic coil 1. This is a rotor made of a magnetic material that is arranged to surround and has a pulley portion 21 provided integrally on the outer periphery. The rotor 2 is rotatably held on the outer periphery of a shaft hole housing 3 of the compressor via a bearing 4. A compressor shaft 5 for operating a refrigerant compression mechanism (not shown) in the compressor is inserted through the inner periphery of the shaft hole housing 3.

Reference numeral 6 denotes a disk-shaped armature made of a magnetic material, which is arranged in a state of being close to and facing the end face 22 of the rotor 2, and which has a compressor shaft 5 protruding from an outer end opening 3 a of the shaft hole housing 3. On the outer periphery of the tip,
It is mounted so as to be axially displaceable via a coupling 7 according to an embodiment of the present invention.

The coupling 7 is a hub 7 attached to the distal end of the compressor shaft 5 via a bolt 51.
1, an outer ring 72 attached to the armature 6, an annular mass member 73 disposed between the hub 71 and the outer ring 72, and a first elastic member elastically connecting the hub 71 and the mass member 73. A body 74 and a second elastic body 75 for elastically connecting the outer ring 72 and the mass member 73 are provided.

The hub 71 is formed of a metal plate and has an inner disk portion 71a and an outer cylindrical portion 71b protruding outward from the outer periphery in the axial direction. The disk part 7
1a is reinforced by a boss member 77 connected by a plurality of rivets 76 in the circumferential direction.

An outer ring 72 is provided on an outer peripheral portion of an end face of the armature 6 opposite to the rotor 2 via an outer peripheral flange portion 7 fixed via a plurality of rivets 78 in a circumferential direction.
2a and the hub 7 from the inner peripheral end of the outer peripheral flange portion 72a.
And a cylindrical main body portion 72b extending outwardly in the axial direction of the outer peripheral cylindrical portion 71c.

The first and second elastic members 74 and 75 are made of an elastomer.
Is vulcanized and bonded to the outer peripheral surface of the outer cylindrical portion 71b of the hub 71 and the inner peripheral surface of the mass member 73 radially opposed to the outer peripheral cylindrical portion 71b. The outer ring 72 is vulcanized and bonded to the surface and the inner peripheral surface of the cylindrical main body 72b of the outer ring 72 which faces the outer ring 72 in the radial direction.

The mass member 73 is formed on the outer cylindrical portion 7 of the hub 71.
1b and the inner peripheral side from an intermediate position between the cylindrical main body portion 72b of the outer ring 72. That radial thickness T ₁ of the first resilient body 74 is small, the radial thickness T ₂ of the second elastic body 75 is larger, the first elastic member 74 because this is relatively spring constant High, the second elastic body 7
5 has a relatively low spring constant. Since the first elastic body 74 has a high spring constant, the torsion damper system D having the torsion spring as the torsion spring and having the mass member 73 as the inertial mass has a high natural frequency in the torsion direction. The natural frequency corresponds to the natural frequency of the vibration system in which the compressor shaft 5 is a torsion spring and the hub 71 and the boss member 77 are inertial masses.
It is set to about 1000 Hz.

The coupling 7 includes a first elastic member 74, a mass member 73, and a second elastic member
1 and the outer ring 72 are arranged in series in the radial direction.
Is the same size as the elastic body 107c of the conventional structure (FIG. 3) described above, the space between the mass member 73 and the first elastic body 74 makes the outer peripheral cylindrical portion 71b of the hub 71 small. Therefore, the coupling 7 is not enlarged in the radial and axial directions.

Next, the operation of the thus-configured coupling 7 of the present embodiment will be described together with the operation of the electromagnetic clutch.

First, the rotor 2 has a pulley portion 2 on its outer periphery.
The engine 1 is rotated by a driving force from a crank pulley or the like of the engine via a belt (not shown) wound around the motor 1. When an exciting current is supplied to the electromagnetic coil 1 from the state shown in FIG. 1, the armature 6 is opposed to the rotor 2 by the magnetic force against the shearing elasticity of the first and second elastic bodies 74 and 75. In the axial direction, and is attracted to the end face 22 to be in a clutch meet state. At that time, the rotational torque of the rotor 2 is transmitted from the armature 6 to the compressor shaft 5 via the outer ring 72 of the coupling 7, the second elastic body 75, the mass member 73, the first elastic body 74, and the hub 71. And the compressor is put into operation.

More specifically, in the process in which the armature 6 moves axially toward the rotor 2 by magnetic force, the outer ring 72 that moves axially integrally with the armature 6, the outer cylindrical portion 71b of the hub 71 Between
Although the first and second elastic bodies 74 and 75 are subjected to the axial shearing deformation, the second elastic body 75 has a sufficiently lower axial shearing spring constant than the first elastic body 74. This is mainly performed by the second elastic body 75. Therefore, even with a relatively small magnetic force, that is, even when the current value applied to the electromagnetic coil 1 or the size (the number of turns, etc.) of the electromagnetic coil 1 is relatively small, the armature 6 can easily move axially toward the rotor 2. .

The armature 6 is connected to the end face 2 of the rotor 2.
The noise caused by the clutch meat when it is attracted to the armature 2 and the shock caused by the sudden input of the rotational torque of the rotor 2 to the armature 6 at this time are mainly caused by the shearing of the second elastic body 75 having a low spring constant in the torsional direction. The deformation operation effectively alleviates it.

As described above, in the electromagnetic clutch of the compressor, the vibration system in which the compressor shaft 5 is a torsion spring and the hub 71 and the boss member 77 have inertial mass receives the torsional vibration of the compressor shaft 5. , Around 1000 Hz in the torsional direction. But,
In this resonance region, the first elastic body 74 is a torsion spring,
The torsional damper system D having the mass member 73 as the inertial mass resonates in a phase opposite to the torsional vibration input from the vibration system to exhibit a dynamic vibration absorbing effect. That is, since the direction of the torque due to the torsional resonance of the torsional damper system D is opposite to the direction of the torque of the input vibration, the torsional angle of the input vibration is reduced, and the vibration of the compressor is reduced.

In the present invention, the first elastic body 74 has a relatively high spring constant and the second elastic body 75 has a relatively low spring constant. Other than the above, for example, due to the difference in thickness in the axial direction, the provision of a plurality of windows in the second elastic body 75 in the circumferential direction, the elastomer of the first elastic body 74 and the second elastic body 75. Various means can be adopted, such as one based on a difference in material, one based on a structure in which the first elastic body 74 is press-fitted through a metal sleeve to give pre-compression.

[0025]

According to the coupling for an electromagnetic clutch according to the present invention, the second elastic body interposed between the outer ring fixed to the armature and the mass member has a low spring constant, so that the While good clutch operability is ensured by magnetic attraction, shock and noise during clutch meet are effectively mitigated, and the first elastic body having a high spring constant relative to the mass member has a natural frequency in the torsional direction. By configuring a sub-vibration system (dynamic damper) having a high level, vibration and noise caused by driving the compressor can be reduced, and the first and second elastic bodies are arranged in series in the radial direction. Does not increase the mounting space.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a typical embodiment of an electromagnetic clutch coupling 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 enlarged cross-sectional view showing the coupling of the embodiment, cut along a plane passing through an axis.

FIG. 3 is a cross-sectional view showing a coupling for an electromagnetic clutch according to the related art, along with a part of the electromagnetic clutch, cut along a plane passing through an axis.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic coil 2 Rotor 21 Pulley part 22 End face 3 Shaft hole housing 3a Outer end opening 4 Bearing 5 Compressor shaft (rotating shaft) 51 Bolt 6 Armature 7 Coupling 71 Hub 71a Disk part 71b Outer cylinder part 72 Outer ring 72a Outer periphery Flange part 72b Cylindrical body part 73 Mass member 74 First elastic body 75 Second elastic body 76, 78 Rivet 77 Boss member D Torsion damper system

Claims (1)

[Claims] An armature (6) opposed to a rotor (2) surrounding the electromagnetic coil (1) and attracted to the rotor (2) by excitation of the electromagnetic coil (1); A hub (71) interposed between the concentrically arranged rotating shaft (5) and attached to the rotating shaft (5); and the armature concentrically arranged on the outer peripheral side of the hub (71). (6) The outer ring (7
2) a mass member (73) arranged between the hub (71) and the outer ring (72); and a first elastomer made of an elastomer for elastically connecting the hub (71) and the mass member (73). An elastic body (74), and an elastomer having a relatively lower spring constant than the first elastic body (74) and elastically connecting the outer ring (72) and the mass member (73). Elastic body (7
5) A coupling for an electromagnetic clutch, comprising: