JPS6060335A - Electromagnetic spring clutch - Google Patents

Abstract

PURPOSE:To greatly reduce the impact torque when the clutches are connected, by winding the coil spring linked to the armature and the output hub, from the winding surface of the output hub. CONSTITUTION:A spring cover 270 is fixed to an output hub by a bolt 110, whereas a coil spring 206 is arranged on the winding surface 1a which is the cylindrical projecting part of an input pulley 1, and also on the winding surface 4a which is the cylindrical peripheral surface of an output hub 4. Since the coil spring starts winding as soon as an armature 250 rotates, the torque is transmitted rotating the output hub 4 and thus the torque transmission of the clutch with an impact is avoided.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention applies, for example, to the refrigerant pressure (1) of an automotive air conditioner. This relates to an electromagnetic spring clutch that is installed between the two.

[Prior art]

As shown in the longitudinal cross-sectional view of FIG. 1, a conventional electromagnetic spring clutch includes an input rotor 1 which is a rotary driving body, and a front housing 1 of a compressor built in the input rotor 1.
01 via a yoke 2a and a stay 2b, and a voltage is applied to the coil 2 to activate the excitation coil 2.
The armature 150 is magnetically attracted by exciting a peripheral magnetic circuit section, and is frictionally engaged with a friction surface 1b provided on the input rotor 1 and rotates together with the armature 150.
The coil spring 6 has one hook portion 6a hooked to a notch 151 formed in the coil spring 6, and the other hook portion 6b hooked to a notch 41 provided in the output hub 4, which is a rotating driven body.
When the coil 2 is energized, the coil spring 6 winds around the cylindrical spring winding surface 1a protruding from the input rotor 1 in the axial direction and the outer periphery of the output hub 4. The torque of the input rotor 1 is transmitted via the output hub 4 to the rotating shaft 104 of the pressure #ata fixed to the output hub 4 by a key 102 and a nut 103. Further, the coil spring 6 is concentrically attached to the output hub 4 and housed in a spring cover 170 made of a non-magnetic material, and the armature 150 is attached to the spring cover 170.
The input rotor 1 is supported by a flange portion 171 on the input rotor 1 side. Furthermore, the input rotor l is supported by a bearing 109 attached to the outer periphery of the front housing 101 of the compressor, and the bearing 109 is fixed to the outer periphery of the front housing 101 by a circlip 108. When the excitation coil 2 is de-energized (de-energized), the flange portion 17 of the spring cover 170
The armature 150 is attracted to the spring cover 170 by a permanent magnet 173 fixed to the spring cover 1 by adhesive or the like, and the spring 6 is returned to its original shape.

However, in the conventional electromagnetic spring clutch having the above configuration, voltage (3) is applied to the coil 2 to apply attraction friction to the actuator 150 to the input rotor 1, and at the same time, the coil spring 6 is applied to the human pulley 1.
The spring is wound around the cylindrical spring winding surface 1a and the outer periphery of the output hub 4, and at this time, an impact torque is generated on the shaft 104 of the compressor. This impact torque not only generates noise in the vehicle interior and deteriorates the feeling of the vehicle, but also has the drawback of adversely affecting the life of the joint between the output hub 4 and the input shaft 104 of the compressor using the key 102.

[Purpose of the invention]

In view of the above-mentioned interlayer, an object of the present invention is to significantly reduce the impact torque when the clutch is engaged by configuring the coil spring to start winding from the output hub side when the clutch is engaged.

〔Example〕

The present invention will now be described in detail with reference to the accompanying drawings. 2 and 3 show one embodiment of the present invention, in which an excitation coil 2 is built into an input rotor 1 with a minute interval therebetween, and the input rotor 1 is a driven device for compressing air conditioning for automobiles. It is rotatably supported by a front housing 101 of a machine (not shown) (4) via a bearing 109.

An output hub 4 is coupled to a rotating shaft 104 of the compressor via a key 102.

An armature 250 is disposed facing each other on the side surface of the input rotor l, and one end of a ring 251 is press-fitted and fixed to the outer periphery of the armature 250.
1 and the guide 253 are connected by a plurality of elastic bodies 252 made of, for example, rubber. The guide 253 is ring-shaped with a cross section, and a punched bent piece 256 is formed on this guide 253 to form a hole 256a.
It's open. Coil spring 20 is inserted into this hole 256a.
One end 206a of the coil spring 2 is inserted and locked through the slit 271 of the spring cover 270.
The other end 206b of the spring cover 270 is engaged with a notch 255 of a stopper 254 press-fitted into the spring cover 270. Since one end 206a of the coil spring 206 rotates by a predetermined angle until the winding is completed, the slit 271 of the spring cover 270 (5) has an arc shape with a predetermined angular range as shown in FIG. It is formed. Further, the spring cover 270 is fixed to the output hub 4 with bolts 110. coil spring 2
06 is the cylindrical protrusion of the input pulley 1, and the winding is on the surface 1.
A and the winding consisting of the cylindrical outer peripheral surface of the output cup 4 are arranged on the surface 4a.

In addition, the input rotor 1 receives power taken out from a drive source (for example, an automobile engine) not shown through a belt not shown, and the magnetic flux generated when voltage is applied to the coil 2 flows into the arc-shaped east of the input rotor 1. It bypasses the slit IC, passes through the armature 250, and generates a magnetic attraction force.

In this example, the input pulley 1 that forms the magnetic circuit, the armature 250 of the yoke 2a1 around the excitation coil 2, the coil spring 206, and the output hub 4 are all made of iron-based materials, and the ring 251, guide 253, and spring Cover 270 may be formed from either ferrous or non-ferrous materials.

(6) After press-fitting and fixing the stopper 254 to the spring cover 270, as shown in FIG.
1 is press-fitted and fixed, and the stopper 254 is fixed to the armature 2.
Since the armature 250 is formed to guide the inner peripheral portion of the armature 250, eccentricity of the armature 250 during operation is suppressed.

Further, an elastic body 252 made of rubber, for example, vulcanized and bonded between the ring 251 and the guide 253 is used to return the armature T-250 to its original position when the current to the coil 2 is cut off. .

Next, the operation of the electromagnetic spring clutch having the above configuration will be explained. First, when a voltage is applied to the excitation coil 2, the magnetic circuit around it and the armature 250 are excited, and the armature 250 is thereby magnetically attracted and rotates together with the friction surface 1b of the input rotor 1, and the armature 250 rotates. is one end 206a of the coil spring 206 (output hub 4 side (7) end ), the coil spring 206 starts winding the output hub 4 from the surface 4a, and as it rotates, the winding of the output hub 4 and the human-powered rotor 1 completes the winding around the surfaces 4a and 4a, Input rotor 1 torque is transmitted to output hub 4. In this way, the coil spring 206 starts winding from the outer circumferential surface of the output hub 4, that is, the winding surface 4a, at the same time as the armature 250 begins to rotate. will be carried out. Therefore, no impulsive torque transmission occurs, and the torque is transmitted to the rotating shaft 104 of the compressor while being relaxed. If the excitation coil 2 is not energized, the armature 250 will move against the friction surface 1 of the input rotor 1 due to the axial reaction force of the elastic body 252 between the ring 251 and the guide 253.
b is released, the armature 250 returns to its original position, and the coil spring 206 is returned by its self-returning force.
Torque transmission is reliably released. In the above embodiment, the axial reaction force of the elastic body 252 is used as the return force of the armature 250, but the shape of the elastic body 2 (8) 52 can be modified in various ways. Alternatively, the elastic body 252 can be disposed of by using a spring means such as a plate spring or a coil spring.

[Effects of the Invention] As described above, in the present invention, the coil spring 206
Since the winding is started from the outer circumferential surface 4a of the output hub 4, torque is transmitted while the output hub 4 is pre-rotated, and this has the effect of reliably preventing the generation of impact torque when the clutch is engaged. be.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional clutch, and FIG. 2 is a longitudinal sectional view showing an embodiment of the clutch of the present invention, showing a cross section taken along line A--A in FIG. 3. FIG. 3 is a front view of the clutch of the present invention. 4 is a front view of the main part of FIG. 3, and FIG. 5 is a sectional view taken along the line BB in FIG. 4. 1... Input rotor, 1a... Winding is on the surface, 2... Excitation coil, 4... Output hub, 4a... Winding is on the surface, 2
06...(9) Coil spring, 250... Armature, 251°252.253... Ring forming a connecting member, elastic body. Guide, 254, 270... Stroke, collar, and spring cover forming connecting members. Representative Patent Attorney Takashi Okabe (10) Figure 1 Figure 2

Claims (1)

[Claims] A human-powered rotor that rotates by receiving power from a drive source, an excitation coil, an armature that is magnetically attracted to the input rotor by energization of the excitation coil and rotates together with the input rotor, and a rotating shaft of a driven device. an output hub coupled to the input rotor and the output hub, and a coil spring arranged flush with the input rotor and the output hub, and an end of the coil spring on the output hub side is connected to the coil spring through a connecting member. and coupled to the armature, and the end on the human power hub side is coupled to the output hub via a connecting member,
An electromagnetic spring clutch configured so that the coil spring starts winding from the surface of the output hub.