JPH0610973A - Engaging sound preventing mechanism for electromagnetic clutch - Google Patents

Abstract

PURPOSE:To provide the engaging sound preventing mechanism of an electromagnetic clutch capable of suppressing the engaging sound generated when an electromagnetic coil is excited and an armature is engaged with a rotor. CONSTITUTION:Plate springs 11 connecting an armature 5 to a body to be rotated are provided with arm sections 17 extended to the inner periphery from the outer periphery side of the armature 5 fixed to the armature 5 with rivets 13. Damping materials 18 made of a rubber elastic body are fitted to the faces of the arm sections 17 on the armature 5 side, and they are pressed to the armature by the spring force of the arm sections 17. The damping materials 18 absorb the vibration of the armature 5, and the engaging sound generated when the armature 5 is engaged with the rotor can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch that transmits and cuts off rotary power, and is suitable for use in, for example, connecting and disconnecting a compressor of a car air conditioner, and particularly when the rotor and armature are attached. This is a technology related to a mechanism for preventing the generated sound.

[0002]

2. Description of the Related Art A dry-type single-plate electromagnetic clutch includes an armature which is arranged to face a rotor which is rotationally driven with a gap. When the electromagnetic coil is energized to generate a magnetic force, the armature supported by the rotary driven body via the leaf spring is attracted to the rotor and is attached to the rotor by the deformation of the leaf spring. As a result, the rotation of the rotor is transmitted to the rotary driven body via the armature and the leaf spring.

[0003]

In the structure of the electromagnetic clutch described above, since the armature is opposed to the rotor with a gap therebetween when the energization of the electromagnetic coil is stopped, the electromagnetic coil is energized and the armature is attached to the rotor. When doing
The armature collides with the rotor. Since the armature is supported via the leaf spring, it has low rigidity. For this reason, when the armature collides with the rotor, the armature vibrates and a relatively large operating noise, that is, an adhered noise is generated.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an attachment noise preventing mechanism for an electromagnetic clutch capable of suppressing attachment noise when the armature is attached to the rotor. is there.

[0005]

In order to achieve the above-mentioned object, the mechanism for preventing noise of the electromagnetic clutch of the present invention employs the following technical means. The electromagnetic clutch of the present invention includes an electromagnetic coil that generates a magnetic force when energized, a rotor that is rotationally driven, an armature that is attached to the rotor by the magnetic force generated by the electromagnetic coil, and receives the rotation of the rotor, and the armature. A rotary driven body that rotates integrally, and a leaf spring that is provided between the armature and the rotary driven body and that displaceably supports the armature toward the rotor are provided. The leaf spring includes an arm portion fixed to the armature and extending to the inner and outer peripheral sides of the armature. Further, on the armature side surface of the arm portion, a vibration isolator that is pressed against the armature by the spring force of the arm portion is provided.

[0006]

When the electromagnetic coil is energized, the armature is attracted to the rotor and adheres to the rotor. When the armature is attracted to the rotor, the arm portion is fixed to the armature, so that the arm portion is displaced to the rotor side together with the armature. When the armature is attached to the rotor, the vibration-proof material pressed against the armature by the arm portion absorbs the vibration of the armature.

[0007]

As described above, in the mechanism for preventing attachment noise of the electromagnetic clutch of the present invention, when the armature is attached to the rotor, the vibration of the armature is absorbed by the vibration isolator. For this reason, it is possible to suppress the sound to be applied when the armature is applied to the rotor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an explanation will be given of an adhered sound preventing mechanism for an electromagnetic clutch of the present invention based on an embodiment shown in the drawings. [Structure of Embodiment] FIGS. 1 to 4 show a first embodiment of the present invention, and FIG. 2 is a sectional view of an electromagnetic clutch attached to a refrigerant compressor of a vehicle refrigeration cycle. The electromagnetic clutch 1 includes an electromagnetic coil 3 housed in a stator 2.
A rotor 4 which is rotationally driven by an engine (not shown), and a rotary driven body 6 having an armature 5 which is attached to the rotor 4 by the magnetic force generated by the electromagnetic coil 3 and receives the rotational power of the rotor 4.

The electromagnetic coil 3 comprises a resin bobbin 7 and a conductive wire wound around the resin bobbin 7. The electromagnetic coil 3 is housed in a stator 2 made of a magnetic material having a U-shaped cross section. It is fixed inside the mold. The stator 2 is fixed to a ring-shaped support member 9,
The stator 2 is attached to the refrigerant compressor by fixing the supporting member 9 to the housing of the refrigerant compressor (not shown). The rotor 4 has a pulley 4a around which a multi-stage V-belt (not shown) is wound, and is rotated by the rotational power of the engine transmitted via the V-belt. The rotor 4 is made of a magnetic material such as iron, and has a U-shaped cross section for housing the stator 2. Also, the rotor 4
Has a bearing 10 on its inner circumference, and the bearing 10 rotatably supports the rotor 4 in the housing of the refrigerant compressor. The armature 5 is arranged to face the friction surface of the rotor 4 with a gap, and has an annular shape made of a magnetic material such as iron. The rotary driven body 6 is of a cylindrical shape having a brim portion usually called an inner hub,
The flange portion is connected to the armature 5 via a leaf spring 11 made of a plurality of metal spring materials, and the rotary driven body 6 and the armature 5 rotate integrally. Armature 5 and leaf spring 1
1 is fixed by a rivet 13, and the other end of the leaf spring 11 and the flange of the rotary driven body 6 are fixed by a rivet 14. The elastic force of the leaf spring 11 causes the armature 5 to be displaced in a direction away from the rotor 4. The rivet 14 that fixes the leaf spring 11 and the rotary driven body 6 also fixes the triangular plate-shaped plate hub 15 to the rotary driven body 6 at the same time. A plurality of stopper cushions 16 made of an elastic member such as a rubber material are attached by press fitting into holes formed near the triangular tops of the plate hub 15. As shown in FIG. 2, the stopper cushion 16 has a disc portion 16a inserted between the plate hub 15 and the armature 5, and the disc portion 16a causes the armature 5 to separate from the rotor 4 by a predetermined gap or more. Is blocked, and when the energization of the electromagnetic coil 3 is stopped,
The gap between the armature 5 and the rotor 4 is maintained at a predetermined gap (for example, 0.5 mm).

In the leaf spring 11, as shown in FIG. 1, the armature 5 is fixed from the outer peripheral side portion fixed to the armature 5.
An arm portion 17 extending toward the inner peripheral side of is integrally provided. On the armature 5 side of the arm portion 17, as shown in FIG. 3, a vibration damping material 18 for suppressing the vibration of the armature 5 is provided.
Is attached. The vibration-proof material 18 is provided with two convex portions 18a to be fixed to the arm portion 17, and the two convex portions 18a are press-fitted into the two holes 17a provided in the arm portion 17, A vibration isolator 18 is fixed to the arm portion 17. The vibration isolator 18 is an elastic member made of rubber, and when the leaf spring 11 is fixed to the armature 5 by the rivet 13, the vibration isolator 18 is pressed against the armature 5 by the spring force of the leaf spring 11. Further, the arm portion 17 securely presses the vibration isolator 18 against the armature 5, as shown in FIG.
It is formed in a shape that is bent toward the armature 5 side as it goes away from the fixed position by 3 toward the inner circumference. As a result, the vibration isolator 18 is pressed against the armature 5 from the inner circumference to the outer circumference with substantially the same surface pressure. The same effect can be obtained even if the vibration-proof material 18 is formed thicker toward the inner circumference.

[Operation of Embodiment] Next, the operation of the above embodiment will be briefly described. When the energization of the electromagnetic coil 3 is stopped, the armature 5 is held at a position distant from the rotor 4 by the action of the leaf spring 11, so that the V belt does not move to the rotor 4
The rotational power transmitted to the bearing 10 is not transmitted to the armature 5 and the rotary driven body 6, and only the rotor 4
Spin on the top. When the electromagnetic coil 3 is energized, the magnetic force generated by the electromagnetic coil 3 causes the armature 5 to move to the rotor 4
And the armature 5 is attached to the rotor 4. Then, the rotation of the rotor 4 causes the armature 5, the leaf spring 11,
It is transmitted to the input shaft of the refrigerant compressor via the rotary driven body 6,
The refrigerant compressor is driven.

When the armature 5 is attached to the rotor 4,
The armature 5 collides with the rotor 4 and an impact is generated.
Due to this impact, the armature 5 tries to generate a sound to be received, but since the vibration-proof material 18 is pressed against the armature 5 by the arm portion 17, the vibration-proof material 18 absorbs the vibration of the generated sound to be received. To do.

[Effects of the Embodiment] In the present embodiment, as shown by the above-mentioned operation, the vibration damping material 18 suppresses the vibration of the armature 5 when the armature 5 is attached to the rotor 4. In particular, vibration on the inner peripheral side of the armature 5 can also be suppressed. For this reason, when the armature 5 is attached to the rotor 4, it is possible to reduce the generation of the attached sound.

[Second Embodiment] FIG. 5 is a plan view of an electromagnetic clutch 1 showing a second embodiment. In this embodiment, the leaf spring 11
Is formed into a ring shape, and inside the ring,
A crescent-shaped arm portion 17 whose end portion extends to the inner circumference of the armature 5 is provided. Then, the vibration damping material 18 is
The arm 17 is fixed to the surface of the arm 17 on the armature 5 side by, for example, baking or an adhesive.

[Brief description of drawings]

FIG. 1 is a plan view of an electromagnetic clutch (first embodiment).

FIG. 2 is a sectional view of an electromagnetic clutch (first embodiment).

FIG. 3 is a sectional view taken along line AA of FIG. 1 (first embodiment).

FIG. 4 is a cross-sectional view of an arm portion before a vibration isolator is attached (first embodiment).

FIG. 5 is a plan view of an electromagnetic clutch (second embodiment).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic clutch 3 Electromagnetic coil 4 Rotor 5 Armature 6 Rotating driven body 11 Leaf spring 17 Arm part 18 Anti-vibration material

Claims (1)

[Claims] 1. An electromagnetic coil that generates a magnetic force when energized, a rotor that is rotationally driven, an armature that is attached to the rotor by the magnetic force generated by the electromagnetic coil, and receives the rotation of the rotor, and the armature that is integral with the armature. A rotating driven body that rotates, and is provided between the armature and the rotating driven body,
In an electromagnetic clutch comprising a leaf spring supporting the armature so as to be displaceable to the rotor side, the leaf spring is fixed to the armature and includes an arm portion extending to an inner and outer peripheral side of the armature, and An anti-slip mechanism for an electromagnetic clutch, characterized in that a vibration damping material that is pressed against the armature by a spring force of the arm portion is provided on a surface on the armature side.