JPS6023557Y2 - electromagnetic spring clutch - Google Patents

Description

[Detailed description of the invention] This invention connects the input pulley and output rotor using an armature that is magnetically attracted to the input pulley, and a coil spring that is hooked at one end to the armature and hooked to the output rotor at the other end. The present invention relates to a so-called electromagnetic spring clutch operated by an electromagnetic spring clutch.

This type of electromagnetic spring clutch, as shown in a vertical side view as a conventional example in FIG. 1, includes an input pulley 1 as an input side member, an output rotor 2 as an output side member,
An armature 4 that is magnetically attracted to the input pulley 1 within the magnetic flux generated by energizing the electromagnetic coil 3 built into the input pulley 1 is disposed on the same axis. It has a structure in which a boss portion 5 having the same outer diameter as the diameter is provided.

Further, the armature 4 is provided with a notch 6, into which an outwardly bent portion 7a of one end of a coil spring 7 is hooked, with the direction of rotation of the input pulley 1 being the winding direction.

This coil spring 7 is inserted into an annular space formed by the inner circumferential surface of a spring cover 8 concentrically fixed to the output rotor 2, and the outer circumferential surface of the boss portion 5 and the output rotor 2. The inwardly bent portion 7b at the other end is hooked to the notch 9 of the output rotor 2.

By the way, the coil spring 7 is given an initial tension such that its outer diameter surface is pressed against the inner surface of the spring cover 8 and its inner diameter surface is separated from the boss portion 5 of the input pulley 1 and the outer circumferential surface of the output rotor 2. It has been prepared and loaded.

Further, the input pulley 1 is supported by a bearing 11 on a boss portion 10a of a bearing holder 10, which is a stationary member, and an output shaft 13 is attached to the boss portion 10a with a key 12 to rotate together with the output rotor 2. It is inserted.

An electromagnetic spring clutch having such a structure is used, for example, as a power transmission means for a car cooler, and the input pulley 1 is connected by a belt to an output pulley (not shown) attached to the output shaft of an automobile engine.

Now, when the electromagnetic coil 3 is energized, magnetic flux is generated, and the armature 4 is magnetically attracted to the input pulley 1 and rotated together with the input pulley 1.

Due to this rotation, the coil spring 7 is tightened, and its inner diameter surface is pressed against the outer circumferential surface of the boss portion 5 of the input pulley 1 and the outer circumferential surface of the output rotor 2, and the input rotor 1 and the output rotor 2 are integrally connected. enables torque transmission.

When the power to the electromagnetic coil 3 is cut off, the demagnetized and free armature 4 separates from the input pulley 1 and is rotated back by the release of the coil spring 7. is in pressure contact with the inner surface of the spring cover 8 and comes to rest against the spring cover 8,
It remains in this state until it is energized again.

In the electromagnetic spring clutch that operates in this way, the armature 4 can be instantly separated from the input pulley 1 by the coil spring 7 when it is demagnetized, and the coil spring 7 can be tightened against the load on the output side. As long as the armature magnetic attraction capacity is sufficient to maintain the torque, torque transmission is reliable and there are many other advantages.

However, when transmitting power, when the electromagnetic coil 3 is energized, the armature 4 is instantaneously magnetically attracted to the input pulley 1 and the coil spring 7 is tightened, resulting in a rapid rise in torque and Each device will be adversely affected.

In addition, due to such rapid tightening, the inner diameter surface of the coil spring 7 is exposed to the boss portion 5 of the input pulley 1 and the output rotor 2.
There were problems such as violently hitting the machine and making noise.

Based on the above-mentioned viewpoints, this invention aims to provide an electromagnetic spring clutch that eliminates the sudden rise in transmission torque and reduces noise generation.
The output rotor is divided into two parts, an inner and outer part, and these two parts are
The above problem can be solved by using a spline fitting or a similar fitting in which an elastic material such as rubber or plastic of a predetermined thickness is interposed over the entire fitting surface, and the buffering effect accompanying the compressive deformation of the elastic material is used. It is distinctive in that it has been designed.

Next, the electromagnetic spring clutch of this invention will be described by way of examples with reference to the drawings.

FIG. 2 shows an embodiment of the electromagnetic spring clutch of this invention in a longitudinal sectional side view.

Further, FIG. 3 shows a longitudinal sectional front view of the portion taken along line X--X in FIG.

This embodiment is an improved version of the output rotor 2, which is the output side member of the conventional electromagnetic spring 3 latch explained earlier in FIG. 1, and since all other parts have the same structure, the output port - The structural description of the parts other than the tab 2 will refer to the description regarding FIG. 1 mentioned above, and redundant description will be omitted.

The output rotor 2 includes an inner member 2A fixed to the output shaft 13 with a key 12, and an inwardly bent portion 7 of a coil spring 7.
It consists of an outer member 2B which is adapted to be hooked.

The inner and outer members 2A and 2B are respectively formed with corresponding uneven spline portions 14A and spline holes 14B, and the spline portions 14A and spline holes 14B are
They are fitted to each other via an elastic material 15 made of compressively deformable rubber or plastic having a predetermined thickness over the entire fitting surface.

Note that the spring cover 8 is fixed to the inner member 2A at three locations with screws 16.

The electromagnetic spring clutch devised with the above-mentioned configuration is
Similar to conventional electromagnetic spring clutches, the armature 4 is magnetically attracted to the input pulley 1, thereby tightening the coil spring 7 and transmitting torque from the input pulley 1 to the output rotor 2. The impact torque transmitted to the outer member 2B is transmitted to the elastic material 1
5 is compressed and transmitted in a buffered state to the inner member 2A,
Since the output shaft 13 is rotated, the output shaft 13 is activated without receiving an impulsive torque transmission.

In particular, the inner and outer members 2A are fitted with each other through the elastic material 15 between the spline portion 14A and the spline hole portion 14B;
2B has a large compression volume during torque transmission, and has a remarkable ability to prevent a sudden rise in transmission torque.

As is clear from the above explanation, the electromagnetic spring clutch of this invention can prevent sudden rises in transmission torque and generation of noise, and has a useful effect in preventing damage to both the drive side and the driven side equipment. It brings about, and also,
Even if fatigue occurs in the elastic member 15 or damage occurs to a part of it, since the spline part and the spline hole part fit together, there is no possibility that torque transmission will become impossible. There are advantages.

[Brief explanation of drawings]

Fig. 1 is a longitudinal side view showing an example of a conventional electromagnetic spring clutch, Fig. 2 is a longitudinal side view showing an embodiment of the electromagnetic spring clutch of this invention, and Fig. 3 is a sectional view taken along the line X-X of Fig. 2. It is. In the drawings, 1... Input pulley, 2... Output rotor, 2A... Inner member, 2B... Outer member, 3... Bent electromagnetic coil, 4... Armature, 5... Boss section, 6, 9... Notch, 7
・eases coil spring, 7a, 7b...
- Bent part, bent part - Spring cover, 13... Bent output shaft, 14A... Spline part, 14B - Bent part, spline hole part, 15... Elastic material.

Claims (1)

[Scope of utility model registration request] To transmit torque from the input pulley to the output rotor, an armature is magnetically attracted to the input pulley, and one end is hooked to the armature and the other end is hooked to the output rotor, and the rotation direction of the input pulley is tightened. In an electromagnetic spring clutch that uses a coil spring with a fixed direction, the output rotor is divided into two parts, an inner and an outer part, and these two parts are covered with elastic material such as rubber or plastic of a predetermined thickness over the entire mating surface. An electromagnetic spring clutch characterized by an interposed spline fitting or a similar fitting.