JPH051032U - Magnet clutch - Google Patents

Abstract

(57) [Summary] [Purpose] In miniaturized magnet clutches,
The object is to improve productivity by shortening the time required to reduce the surface runout of the armature friction surface. [Configuration] Outer hub 11 for fixing the armature 5
And the inner hub 12 fixed to the drive shaft of the refrigerant compressor, a rubber hub 13 is interposed between the two and is bonded and fixed to both. The inner peripheral side of the armature 5 facing the rubber hub 13 is provided in a thin shape and extends to the inner peripheral side of the ring shield 10, and between the extended thin portion 9 and the inner hub 12 of the rubber hub 13. It has a structure of sandwiching the protruding portion 13a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic clutch that transmits and interrupts rotational power.

[0002]

[Prior Art]

 Conventionally, in a magnet clutch mounted on a refrigerant compressor of a vehicle refrigeration cycle, as shown in FIG. 4, an outer hub 101 for fixing an armature 100 and an inner hub 102 connected to a rotating shaft (not shown) are provided. A technique has been disclosed in which a rubber hub 103 is interposed between them to reduce the operating noise when the armature 100 returns.

[0003]

[Problems to be solved by the device]

 In the magnet clutch using the rubber hub 103, when the friction surface 100a of the armature 100 is polished, the rubber seat 103a protruding on the inner peripheral side of the rubber hub 103 is provided in order to improve the surface runout accuracy. It is sandwiched between the inner cover 102 and the inner hub 102 (see Japanese Utility Model Laid-Open No. 63-129722).

However, when the size is reduced in the radial direction (vertical direction in FIG. 4) due to the demand for miniaturization, the inner peripheral side of the armature 100 and the ring shield 104 interfere with each other, and as shown in FIG. The rubber seat 103a cannot be sandwiched between the armature 100 and the inner hub 102.

Therefore, when the friction surface 100a is polished, the rubber hub 103 is elastically deformed by the polishing pressure applied to the friction surface 100a, and it becomes difficult to secure good surface accuracy. As a result, there is a problem that it takes a lot of time to reduce the surface runout of the friction surface 100a, which causes a decrease in productivity.

The present invention has been made in view of the above circumstances, and an object thereof is to reduce the time required to reduce the surface runout of the armature friction surface in a downsized magnet clutch. It is to improve productivity.

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an exciting coil that generates a magnetic force when energized, an annular clutch rotor that is rotatably supported to form a magnetic path of the exciting coil, and an axial direction. A hollow disc that faces the clutch rotor with a predetermined gap in it, is attracted to the clutch rotor side when the exciting coil is energized, and rotates integrally with the clutch rotor by frictional engagement. Provided on the inner circumferential side between the frictional surface of the armature, the friction surface of the clutch rotor forming the gap, and the friction surface of the armature. A cylindrical ring shield that prevents scattering to the outer arm, an annular outer hub fixed to the outer peripheral portion of the armature, and an inner peripheral side of the outer hub that is coaxial with the outer hub. The inner hub having the stepped cylindrical inner hub and the outer peripheral surface of the inner hub and the inner peripheral surface of the outer hub that are arranged in the radial direction are connected to each other, and the inner peripheral side facing the armature is the inner hub. Is provided along a wall surface extending in the radial direction, and the inner peripheral surface of the protruding portion includes an annular rubber hub that reaches the inner peripheral side of the ring shield in the radial direction,

In the armature, the inner peripheral side facing the rubber hub is provided in a thin wall in the axial direction and extends to the inner peripheral side of the ring shield, and between the extended thin wall portion and the inner hub. The technical means is to have a structure in which the protruding portion of the rubber hub is sandwiched in the axial direction.

[0008]

[Action]

 In the magnet clutch of the present invention having the above-described structure, the inner peripheral side of the armature is provided thinly and extends to the inner peripheral side of the ring shield without the armature and the ring shield interfering with each other. Since the protruding portion of the rubber hub is sandwiched in the axial direction between the thin portion of the extended armature and the inner hub, when the friction surface of the armature is polished, the polishing pressure applied to the friction surface is applied. The elastic deformation of the rubber hub can be suppressed.

[0009]

【Example】

 Next, the magnet clutch of the present invention will be described based on an embodiment shown in FIGS. FIG. 1 is a half sectional view of a magnet clutch. The magnetic clutch 1 of this embodiment is mounted on a refrigerant compressor (not shown) of a refrigeration cycle, and transmits or cuts the rotational output of the engine to a drive shaft (not shown) of the refrigerant compressor as needed. is there.

The magnet clutch 1 is roughly classified into an exciting coil 2, a stator housing 3 that supports the exciting coil 2, a clutch rotor 4 that rotates by transmitting a rotation output of the engine, and the exciting coil 2 is energized. The armature 5 is attracted to the front end surface (left side surface in FIG. 1) of the clutch rotor 4 when the clutch rotor 4 is held, and a hub assembly (described later) that holds the armature 5 is formed.

The exciting coil 2 is a well-known one in which a conductive wire coated with an insulating film is wound around a resin bobbin 6 and generates a magnetic force when energized.

The stator housing 3 is made of a magnetic material such as iron, and forms a magnetic path for the exciting coil 2 together with the clutch rotor 4.

The clutch rotor 4 has an annular shape with a U-shaped cross section (an inverted U-shaped in FIG. 1) that covers the exciting coil 2 supported by the stator housing 3 from the front (left side in FIG. 1). It is rotatably supported via ball bearings 7 arranged around the circumference. A pulley 8 is fixed to the outer periphery of the clutch rotor 4 and is rotated by the rotational power of the engine transmitted via a multi-stage V-belt (not shown) that is wound around the pulley 8.

The clutch rotor 4 has a front end surface provided as a smooth friction surface. At the inner and outer circumferences of the friction surface, elongated holes 4a for magnetic isolation are formed over substantially the entire circumference.

The armature 5 is in the shape of a hollow disk and has a predetermined gap in the axial direction and is arranged to face the friction surface of the clutch rotor 4. In this armature 5, the rear end surface (right end surface in FIG. 1) facing the friction surface of the clutch rotor 4 is a smooth friction surface, and when the exciting coil 2 is energized, it is attracted to the clutch rotor 4 side and the friction surface Engages with the friction surface to rotate integrally with the clutch rotor 4. Further, as shown in FIG. 2 (a plan view of the armature 5 assembled to the hub assembly), the armature 5 is formed with a magnetic blocking hole 5a for blocking the magnetic force acting on the armature 5 over substantially the entire circumference. Has been done.

Further, on the inner peripheral side of the armature 5, the front end face side thereof is provided in a thin shape, and the thin portion 9 has cutouts 9a at appropriate intervals in the circumferential direction, as shown in FIG. Are formed. The notch 9a is provided for discharging the oil flowing from the inside of the refrigerant compressor and the ball bearing 7 to the outside of the friction surface when the clutch rotor 4 rotates.

A ring shield 10 sandwiched between the clutch rotor 4 and the ball bearing 7 is provided on the inner peripheral side between the friction surface of the clutch rotor 4 and the friction surface of the armature 5. The ring shield 10 is provided so as to extend in the axial direction from the clutch rotor 4 side to the armature 5 side in a cylindrical shape. When the clutch rotor 4 rotates, compressor oil, lubricant, etc. are scattered and the friction surface of the clutch rotor 4 is scattered. It also prevents it from adhering to the rubbing surface of the armature 5.

The hub assembly includes an outer hub 11 that fixes the armature 5, an inner hub 12 that is coaxial with the outer hub 11 and is arranged on the inner peripheral side of the outer hub 11, and an annular ring that connects the outer hub 11 and the inner hub 12. And a rubber hub 13 of.

The outer hub 11 has an annular shape with an L-shaped cross section (an inverted L-shape in FIG. 1), and the outer peripheral portion of the armature 5 is fixed with three rivets 15 via washers 14. The inner hub 12 is provided in the shape of a stepped cylinder having a large diameter cylindrical portion 12a and a small diameter cylindrical portion 12b, and is fixed to the drive shaft of the refrigerant compressor by the small diameter cylindrical portion 12b.

The rubber hub 13 is interposed between the inner peripheral surface of the outer hub 11 and the outer peripheral surface of the large-diameter cylindrical portion 12 a of the inner hub 12, and is adhesively fixed to both the outer hub 11 and the armature 5 fixed to the outer hub 11. A gap of about 0.5 mm is maintained between the friction surface and the friction surface of the clutch rotor 4 when the excitation coil 2 is de-energized.

The rubber hub 13 is fixed to the outer hub 11 that moves integrally with the armature 5 and the drive shaft of the refrigerant compressor, because the armature 5 is attracted to the clutch rotor 4 when the exciting coil 2 is energized. When an elastic deformation is generated in the axial direction between the inner hub 12 and the energized inner hub 12, the elastic force causes the armature 5 to move to the initial position (the position shown in FIG. 1). Return to.

The inner peripheral side of the rubber hub 13 facing the armature 5 is projected along the wall surface 12 c extending in the radial direction of the inner hub 12, and the protruding portion 13 a is fixed to the outer hub 11. It is provided so as to be sandwiched between the thin portion 9 of the armature 5 and the inner hub 12.

The projecting portion 13 a reaches the inner peripheral side of the ring shield 10 in the radial direction and has the same inner diameter dimension as the thin portion 9 of the armature 5. Therefore, the thin portion 9 of the armature 5 is extended to the inner peripheral side of the ring shield 10 without interfering with the ring shield 10 in a state of being in contact with the end surface of the rubber hub 13.

Next, the operation of this embodiment will be briefly described. The armature 5 is attracted to the clutch rotor 4 side against the elastic force of the rubber hub 13 by the magnetic force generated by energizing the exciting coil 2. As a result, the friction surface of the clutch rotor 4 and the friction surface of the armature 5 are in close contact with each other and frictionally engage with each other, whereby the rotational power of the engine transmitted through the pulley 8 is transmitted through the hub assembly to the refrigerant compressor. Is transmitted to the drive shaft of.

Further, when the energization of the exciting coil 2 is stopped, the magnetic force generated by the exciting coil 2 disappears, so that the armature 5 attracted to the clutch rotor 4 side is elastic in the rubber hub 13. The force separates from the clutch rotor 4 and returns to the initial position. As a result, the frictional engagement between the clutch rotor 4 and the armature 5 is released, and the rotational power of the engine transmitted to the clutch rotor 4 is not transmitted to the drive shaft of the refrigerant compressor.

In this magnet clutch 1, since the rubber hub 13 is used as a means for returning the armature 5, the operating noise generated when the armature 5 is returned is reduced as compared with the conventional magnet clutch using the leaf spring. Can be made

In addition, in the magnet clutch 1 of the present embodiment, interference with the armature 5 and the ring shield 10 is prevented by providing the thin portion 9 on the inner peripheral side of the armature 5 in order to reduce the size in the radial direction. In addition, since the protruding portion 13a of the rubber hub 13 is sandwiched between the thin portion 9 and the inner hub 12, when the friction surface of the armature 5 is polished in the final step of the hub assembly, the friction surface contacts the friction surface. It is possible to suppress elastic deformation of the rubber hub 13 due to the polishing pressure.

As a result, the surface wobbling accuracy at the time of polishing is improved, so that the time required to reduce the surface wobbling can be shortened and the productivity can be improved.

In the present embodiment, the thin portion 9 of the armature 5 is provided with the cutout portion 9a for discharging the oil, but the cutout portion 9a is not necessarily provided, and as shown in FIG. Alternatively, the thin portion 9 without the notch 9a may be formed.

[Brief description of drawings]

FIG. 1 is a half sectional view of a magnet clutch.

FIG. 2 is a plan view of an armature assembled to a hub assembly.

FIG. 3 is a plan view showing a modified example of the armature.

FIG. 4 is a half sectional view of a conventional magnet clutch.

[Explanation of symbols]

 1 Magnet Clutch 2 Excitation Coil 4 Clutch Rotor 5 Armature 9 Thin-walled Part 10 Ring Shield 11 Outer Hub 12 Inner Hub 13 Rubber Hub 13a Projection

Claims (1)

Claims for utility model registration: a) Excitation coil that generates a magnetic force when energized; and b) An annular clutch rotor that is rotatably supported to form a magnetic path of the excitation coil. And c) facing the clutch rotor with a predetermined gap in the axial direction,
A hollow disk-shaped armature that is attracted to the clutch rotor side when the exciting coil is energized and rotates integrally with the clutch rotor by frictional engagement; and d) friction of the clutch rotor that forms the gap. A cylindrical ring shield that is provided on the inner peripheral side between the surface and the friction surface of the armature to prevent the oil and the lubricant from scattering to the friction surface when the clutch rotor rotates, and e) the armature. An annular outer hub fixed to the outer peripheral part of f), and f) a stepped cylindrical inner hub arranged coaxially with the outer hub and arranged on the inner peripheral side of the outer hub, g).
It is interposed between the outer peripheral surface of the inner hub and the inner peripheral surface of the outer hub in the radial direction to connect them, and the inner peripheral side facing the armature projects along a wall surface extending in the radial direction of the inner hub. The inner peripheral surface of the protruding portion has an annular rubber hub that reaches the inner peripheral side of the ring shield in the radial direction, and the armature has an inner peripheral side facing the rubber hub that is thin in the axial direction. A magnet clutch having a structure in which the protruding portion of the rubber hub is axially sandwiched between the extended thin portion and the inner hub.