JPH018742Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention concentrically supports the armature on the flange of the armature hub via a leaf spring, and the outside of the flange of the armature hub is connected to a stepped portion formed on the inside of the armature. By bringing it into contact with
This invention relates to an electromagnetic coupling device that obtains the initial deflection of a leaf spring.

[Description of prior art]

As this type of electromagnetic coupling device,
A typical example is the "electromagnetic clutch" described in Publication No. 55454, which is key-fitted to the rotating shaft and prevented from coming off by a nut screwed to the tip of the rotating shaft, so that it can be attached to the flange of the armature hub mounted on the shaft. This flange supports an armature in which the tip of a leaf spring whose base is fixed with a rivet is fixed to the back surface, and the outside of the flange of the armature hub is in contact with a step formed inside the armature. , the initial deflection of the leaf spring is obtained. Then, the armature is magnetically attracted to the rotor by the magnetic attraction force of the magnetic flux generated by applying voltage to the electromagnetic coil, and when the armature is in the non-excited state where voltage application to the electromagnetic coil is stopped from this excited state, the armature is It is quickly separated from the rotor by the return force of the leaf spring.

[Problem that the invention attempts to solve]

In general, armature hubs are often made of magnetic materials such as mild steel in consideration of mechanical strength and economic efficiency. Making the armature hub made of non-magnetic material is not applicable due to economic reasons, and as explained in the same publication, the flange part of the armature hub is constructed separately, and the flange part is made of non-magnetic material. It has been proposed that the armature hub be made of wood, but
If the electromagnetic coupling device is configured as a member, a manufacturing process is required to fix these members together, which poses a problem in that an inexpensive electromagnetic coupling device cannot be provided.

[Means for solving problems]

The present invention aims to provide an inexpensive electromagnetic coupling device that prevents magnetic flux leakage, and includes a rotating shaft, an armature hub concentrically fixed to the rotating shaft,
A leaf spring whose base is fixed to the flange of the armature hub via a stopper plate, a tip of the leaf spring fixed to the back surface, and a radial annular gap with respect to the outer peripheral surface of the flange of the armature hub. and an annular plate-shaped armature disposed concentrically with the armature hub via a non-magnetic member, the outside of the stopper plate is brought into contact with a stepped portion formed inside the armature through a non-magnetic member, and the stopper plate is The invention is characterized in that the inner side of the stopper plate is fixed to the rotating shaft by making the inner side of the plate smaller in diameter than the shaft hole of the rotating shaft of the armature hub.

[Effect]

In the electromagnetic coupling device configured in this manner, the armature is moved backward by the restoring force of the leaf spring in the non-excited state, and this retreated position is such that the stepped portion of the armature abuts the outside of the stopper plate via the non-magnetic member. It is determined by In this state, an initial deflection force is applied to the leaf spring.

〔Example〕

Next, the apparatus of this invention will be explained by way of examples with reference to the drawings.

FIG. 1 shows a longitudinal side view of a device that was developed earlier in developing the device of this invention. To first explain this reference example, this electromagnetic clutch has an armature hub 2 as an output rotating member spline-fitted to an input rotating shaft 1 of a compressor for a car cooler, and this armature hub 2 has a small diameter boss portion 2A and a large diameter boss portion 2A. It consists of a boss part 2B and a flange part 2C.

A stopper plate 3 is fixed to the armature hub 2 by polymerization.

The stopper plate 3 is made of a non-magnetic material, such as stainless steel, and has a boss portion 3A that tightly fits inside the large diameter boss portion 2B of the armature hub 2, and a diameter larger than the flange portion 2C of the armature hub 2.
It consists of a flange part 3B that overlaps and contacts this flange part 2C, and an inward flange part 3C formed at the end of the boss part 3A, and this flange part 3
C is a screw hole 4 opened in the end face of the input rotating shaft 1.
The flange portion 3B is fixed to the input rotating shaft 1 by tightening the bolt 5 screwed into the armature hub 2, and the flange portion 3B is integrally fixed to the flange portion 2C of the armature hub 2 with a leaf spring 6 by a rivet 7.

The base of the leaf spring 6 is fixed to the armature hub 2 and the stopper plate 3 by the rivet 7, and the tip is fixed to the back surface of the ring plate-shaped armature 9 by another rivet 8 to elastically support this armature. are doing.

On the other hand, the boss portion 1 of the compressor casing 10 is arranged concentrically with the input rotating shaft 1 at the center.
At 0A, a rotor 12 as an input rotating member is supported via a bearing 11 so as to be freely rotatable.

It is assumed that the rotor 12 has an annular groove 13 open on the back side, is belted to a crank pulley (not shown) of the engine, and continuously rotates while the engine is running.

An annular field core 1 is disposed within the annular groove 13.
4 is coming.

The field core 14 is fixed to the end of the compressor casing 10 via a mounting plate 15.
It has a built-in electromagnetic coil 16.

The armature 9, which can freely magnetically attract the rotor 12, is pulled in a direction away from the rotor 12 by a leaf spring 6 in a non-excited state, and the back surface of the stepped portion 9A formed on the inside is pressed against the stopper plate 3. A predetermined gap g between the contact and the rotor 12
are kept.

The armature 9 has arcuate holes 17A and 17B for detouring magnetic flux which are concentrically arranged and continuous in the circumferential direction, and the rotor 12 has concentric annular holes that do not match the arcuate holes 17A and 17B. Arc-shaped holes 18A, 18B, and 18C for detouring magnetic flux are provided, respectively, in a continuous arrangement in the circumferential direction.

To explain the operation of the device of this reference example configured as described above, the magnetic flux generated by voltage application to the electromagnetic coil 16 is transferred from the field core 14 to the rotor 1.
2, and furthermore, the arcuate holes 18A, 1 for detouring magnetic flux.
8B, 18C, and the arcuate holes 17A and 17B for detouring the magnetic flux of the armature 9, the armature 9 is excited by passing from the rotor 12 to the armature 9 in a meandering manner between the groups of these arcuate holes.

The excited armature 9 is magnetically attracted to the rotor 12, and torque is transmitted from the constantly rotating rotor 12 to the input rotating shaft 1 via the armature 9, leaf spring 6, stopper plate 3, and armature hub 2.

By the way, when the armature 9 is excited, the back surface of the stepped portion 9A faces the stopper plate 3 through the same gap as the gap g, but since the stopper plate 3 is made of a non-magnetic material, this stopper plate 3 is Since no magnetic flux passes through the rear plate 3, the magnetic flux passes through the armature 9 without leaking to the armature hub 2, allowing effective magnetic attraction.

Further, in this reference example, by making the portion of the stopper plate 3 that the armature 9 comes into contact with with a flexible or elastic synthetic resin, it is possible to provide a buffering force to the armature 9.

On the other hand, the applicant had previously developed an electromagnetic clutch with such a structure and action, and found that the stopper plate 3 was made of stainless steel as a non-magnetic material, and when the stopper plate 3 was deep drawn, stainless steel was used. The electromagnetic clutch described above was improved by paying attention to the fact that the stopper plate 3 is easily magnetized due to its characteristics and that it is difficult to form the cup-shaped portion consisting of the boss portion 3A and the flange portion 3C. FIG. 2 shows an embodiment of the device of this invention in a vertical sectional view of only the main parts. In this embodiment, the stopper plate 3 is not made of a non-magnetic material, but a non-magnetic member such as a stainless steel plate (synthetic This example differs from the reference example described above only in that leakage magnetic flux is prevented by a resin plate 19 (which may also be a resin plate).

The stainless steel plate 19 has an outer diameter corresponding to the outer diameter of the flange portion 3B of the stopper plate 3,
The back surface of the stepped portion 9A of the armature 9 in a non-excited state can come into contact with it. Therefore, since the non-magnetic member is interposed between the armature 9 and the stopper plate 3, it is possible to reliably prevent the magnetic flux from leaking in the direction of the armature hub 2 when the armature 9 is excited, and to effectively control the magnetic flux. It can be used to excite the armature 9. It should be noted that other structures and operations not shown are the same as those of the electromagnetic clutch of the reference example described above, and explanations of these structures and operations will be omitted.

〔effect〕

As is clear from the above explanation, in this invention,
An electromagnetic coupling device that prevents magnetic flux leakage is obtained by using a non-magnetic member interposed between the armature and the stopper plate, and the stopper plate is fixed to the armature hub with rivets along with the base of the leaf spring. There is no need to provide a separate fixing means. In addition, by making the inside of the stopper plate smaller in diameter than the shaft hole of the armature hub and fixing this inside to the rotating shaft, the armature hub is fixed to the rotating shaft so that it does not come off. This type of device has excellent advantages such as no need to form a section, the shape of the armature hub is simplified, and it can be provided at a low cost for this type of device.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view showing a reference example of the apparatus of this invention, and FIG. 2 is a longitudinal sectional side view showing a main part of an embodiment of this invention. In the drawings, 1... Input rotating shaft, 2... Armature hub,
2C...flange part, 3...stopper plate,
3B...flange part, 6...plate spring, 9...armature, 12...rotor, 14...field core, 15...mounting plate, 16...electromagnetic coil, 1
9...Stainless steel plate.

Claims (1)

[Scope of utility model registration request] A rotating shaft 1, an armature hub 2 concentrically fixed to the rotating shaft 1, a leaf spring 6 whose base is fixed to the flange 2C of the armature hub 2 via a stopper plate 3, and a tip end of the leaf spring 6. is fixed to the back surface, and an annular plate-shaped armature 9 is arranged concentrically with the armature hub 2 with a radially annular gap between the outer peripheral surface of the flange portion 2C of the armature hub 2,
The outside of the stopper plate 3 is covered with a non-magnetic member 19.
The stopper plate 3 is brought into contact with a stepped portion 9A formed on the inside of the armature 9 through the stopper plate 3, and the inside of the stopper plate 3 has a smaller diameter than the shaft hole of the rotating shaft 1 of the armature hub 2. An electromagnetic coupling device characterized in that the inside of the plate 3 is fixed to the rotating shaft 1.