JPS588833A - Electromagnetic spring clutch - Google Patents

Abstract

PURPOSE:To effectively soften a shock in torque transmission by uniting a spring cover integral with a cylindrical portion round which a coil spring is coiled and a plate integral with an output hub through a rubber. CONSTITUTION:When an electromagnetic spring clutch magnetically attracts an armature 4 by applying an electric current to an exciting coil 2 to be integral with an input pulley 1, the clutch is adapted to fasten a coil spring 5 fitted in the outside of a flange portion 1a of an input pulley 1 and c cylindrical portion 6 to transmit torque of the input pulley 1 to an output hub 8. In this case, the cylindrical portion 6 is provided with a ring-shaped cover 7 secured thereto which is adapted to cover and support the outer peripheral surface of the spring 5. The cover 7 is fixed on a plate secured to the output hub 8 through a rubber 10 by welding. The rubber 10 functions as damper, and is seizured to the cover 7 and the plate 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic spring clutch used, for example, for switching on and off a compressor for an automobile air conditioner.

Conventionally, this type of electromagnetic spring clutch has a cylindrical part of an input coupler and an output hub having the same outer diameter arranged concentrically in close proximity, and a spring cover having a flange part arranged outside the output hub. A coil spring is installed around the input hub and the output hub inside the Mukuro spring cover, and an armature with a notched tube for hanging the spring is arranged in the flange, and one hook of the coil spring is connected to the spring hook of the armature. Hook it in the stop notch,
Hook the other hook to the spring hook notch formed on the output hub, and input the armature using the excitation coil installed on the side opposite to the armature! - adsorbs to the friction line surface of ri;
17) The torque is transmitted by tightening the coil spring around the cylindrical part of the input pulley and the output hub. Nashidekahade is divided into two inner and outer parts whose inner and outer circumferential surfaces face each other and are arranged concentrically, and a nine-shim elastic body with excellent heat resistance, toughness, and weather resistance is filled and installed on the opposing inner and outer circumferences of both members. There is. Also,
When the power to the excitation coil is cut off, a permanent magnet embedded in the back of the armature that is in contact with the spring cover attracts the armature to the flange of the spring cover and returns the armature to the next position.

However, in the electromagnetic clutch having such a configuration, it is not possible to increase the contact area and volume of the rubber elastic body filled on the opposing inner and outer circumferences of the two inner and outer members of the output hub, so the torque transmission of the electromagnetic clutch connection is difficult. Shock mitigation and torsional resonance of the output shaft attached to the output hub are not sufficiently suppressed, and one output shaft may break, rendering the air conditioner inoperable. Furthermore, the spring cover, which has a flange portion for regulating the return of the armature, is supported by the output hub, so that the gap between the cylindrical portion of the input pulley and the coil spring is small, and the armature is in contact with the flange portion. Therefore, the leakage magnetic flux when the clutch is activated becomes a small amount], and as a result, the magnetic flux to attract the armature to the friction mK of the input date decreases, and there is a risk that it will not be possible to transmit the required torque. However, in order to obtain reliable operation against wear of the armature, the entire clutch has to be larger and heavier, which is a drawback.

The present invention has been made in view of the above points, and includes an input data having excitation coils arranged concentrically, and the input data being magnetically attracted by the excitation of the excitation coil and returned to its original position by a permanent magnet. It is equipped with an armature, and a coil spring that has one end locked to the Mukuro Arch i-chair and the other end locked to a cylindrical part and tightened, and the cylindrical part is integrated with the output hub by a rubber elastic body having a damping effect. At that time, the cylindrical part and the spring cover that accommodates and supports the coil spring are integrated, and a rubber elastic body is baked and formed between this integrated member and the output hub side member, thereby reducing the impact of torque transmission. It is an object of the present invention to provide an electromagnetic spring clutch that reliably dampens and suppresses torsional resonance of an output shaft, further reduces leakage magnetic flux, and suppresses armature vibration noise and noise during attraction.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows a longitudinal sectional view of an embodiment of the present invention, in which the input pulley is supported by a front housing of an air conditioning compressor (not shown) via a bearing 3, and the excitation coil 2 is supported by a yoke. 2 m, and is fixed to the front housing via a stay 2b with a circlip (not shown). Note that the bearing 3 and the input pulley 1 are fixed with a circlip 12. The excitation coil 2 is
It is built into the input pulley 1, and when a voltage is applied, the surrounding magnetic circuit section is excited, and the armature 4 is magnetically attracted and turns integrally with the input pulley 1, and the hook section 5& is locked in the notch 4& of the armature 4. The other hook portion 5b is engaged with the notch 6& of the cylindrical portion 6, and the coil spring 5 fitted on the flange portion 1a of the input pulley 1 and the outside of the cylindrical portion 6 is tightened. To this cylindrical portion 6, a spring cover 7 in the form of a spring 7, which covers and supports the outer circumferential surface of the coil spring 5, is fixed, for example, by welding, in advance. The oil spring cover 7 is attached to a plate 9 which is fixed (by welding or the like) to an output hub 8 which is fixed by bolts to the shaft of a compressor (not shown) via a line 1o via an imm 1o. The ♂lum 10 is a material that performs a damper function with excellent heat resistance and weather resistance. For example, a decyl ♂lum is suitable, and is fixed to the spring cover 1 integrated with the cylindrical portion 6 and the output hub 8. It is molded with plate 9 and Km. When molding the TM 1o by baking, a permanent magnet 11 that releases the armature 4 when the voltage application to the excitation coil 2 is cut off is simultaneously molded into the hole 7b of the stepped portion 7a of the spring cover T, and the permanent magnet 11 shown in FIG. The flange portion 11a of the plate 9 shown in Fig. 82, which is a cutaway view of the edge of the armchair, is also formed integrally with the support portion 10 supporting the armchair 4 with zero male unevenness. Kaderi 1, yoke 2a1 armature air 4, coil spring 5
, the cylindrical part 6, the spring or par 7, the output hub 8, and the plate 9 are all made of tfP material.

The operation of the electromagnetic spring clutch according to the Honjitsu W14 having the above configuration will be explained. First, when a voltage is applied to the excitation coil 2, the surrounding magnetic circuit section and armature 4
By energizing the armature 4, the armature 4 is magnetically attracted and rotated together with the friction gap of the input stage 1, and one end
The fils ring 5, which is locked in the notch 4a of the i-chair and the other end is locked in the notch 6& of the cylindrical part 6, is wound around the cylindrical part 6 and the cylindrical part 1a of the input cage 1. The torque transmitted to the cylindrical part 6 is further transmitted to the output hub 8 which is integrated with the plate 9 via Kf im 0. Because it is large, it can reduce the impact when connecting the gear and suppress the torsional resonance of the output shaft.
Breakage of the output shaft, which often occurred in the past, can be prevented. If the power to the excitation coil 2 is cut off, Ah! Released from the friction surface of the chair 4 input daily 1, the armature 4 returns to its original position by the attractive force of the permanent magnet 11, and is returned to its original position by the force of the Coil Schilling 5Fi self-a4.
Torque transmission is reliably released.

Since the permanent magnet 11 is molded by rubber 10 on the stepped portion 7a of the spring cover T, it can absorb the adhesion sound when the armature 4 returns. Since it is also molded at the same time, it is possible to prevent interference noise when the armature is activated.

In the above-mentioned embodiment, the armature support part 10 & supporting the armature 4 was provided on the plate 9 all around the inner circumference of the pulling part 9a, but as shown in FIG.
It may also be GSL. In addition, the permanent magnet 11 was used as an armchair reaction force, and the permanent magnet 11 was molded at the same time as the TM 10 was sintered and sulfurized. good.

Furthermore, the first plate 9 had a flange portion 9,
As shown in FIG. 4, the shape may be such that seven flange portions are removed. Further, the output hub 8 side of the cylindrical portion 6 was also baked with the rubber 10, but the damping effect can also be obtained by baking and forming 0 male unevenness only from the cylindrical portion 6 to the outer periphery as shown in Fig. 5'. I can do it. Then, the cylindrical portion 6 and the spring cover 7 were integrated by a method such as welding, and a portion corresponding to the cylindrical portion 6 was integrally pressed into the spring cover 7C as shown in FIGS. 6 and 7. A guide groove 7d into which the coil spring 5 is inserted is provided in this part, and this guide groove 7d
The hook portion 5b of the coil spring 5 may be fitted into the stopper 7e, and then the stopper 7e may be fixed to the periphery of the guide groove 7d by welding or the like to prevent the coil spring 5 from moving in the axial direction.

In this case, the rubber 10 is baked and formed in a subsequent process, but as shown in the figure, the rubber 10 is not provided on the inner circumferential side of the coiled spring 5, so that the rubber 10 is not provided on the inner peripheral side of the coiled spring 5. It is necessary to prevent the influx of imm into the country.

As described above, in the electromagnetic spring clutch of the present invention, the space between the plate 90 fixed to the output hub 8 is effectively utilized. By baking and forming the ♂ unevenness to 0, the volume of the ♂ lume can be made sufficiently large, and this allows the ♂ lume to have sufficient shock absorption and torsion/resonance suppression ability, and the output shaft. It has the excellent effect of not causing breakage.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an electromagnetic spring clutch that is an embodiment of the present invention, Fig. 2 is a sectional view taken along the Moum line in Fig. 1, and Fig. 6 is a longitudinal sectional view of an electromagnetic spring clutch that is an embodiment of the present invention. Corresponding sectional views, FIGS. 4, 5, and 6 are longitudinal sectional views of an electromagnetic spring clutch that is another embodiment of the present invention, and FIG. 7 is a sectional view taken along the line 0B-B@ in FIG. 6. be. 1-・Input! -Li, 2... Excitation; Il, 4...
・Armature, 5...Coil spring, 6
...Cylindrical part, 7...Spring cover, 8...Output hub, 10...Im, 10
tL...Supporting part, 11.-Permanent magnet. Agent Asamura Kōgai 4 people 10a 4 Zuga 5 Sakura 6 fig.-,B

Claims (3)

[Claims] (1) A λ card in which excitation coils are arranged concentrically, an armature that is magnetically attracted to the input card 9 by excitation of the excitation coil and returned to its original position by a permanent magnet, and one end attached to the armature. A coil spring that is locked and whose thin end is locked to the circular noodle portion and wound tightly; and a coil spring that is fixed to the cylindrical portion or formed integrally with the self-registered cylindrical portion and covers the above-mentioned; spring cover and
Out of nowhere! The attached plate and the spring covered! An electromagnetic spring clutch comprising a shim elastic body formed by baking between the clutch and the clutch. (2) Claim 1, characterized in that the permanent magnet is nationally defined by simultaneous molding with the shim elastic body.
The 11 monuments listed in Section 11 are Susolingkutsutsuchi. (3) Claims 1 to 9 are characterized in that a male support part located on the outer circumference of the armature and supporting the armature is integrally molded with the shim elastic body. Electromagnetic spring clutch.