JPS633470Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a so-called electromagnetic coupling device, such as an electromagnetic clutch that transmits torque from an input rotating member to an output rotating member, or an electromagnetic brake that prevents a braked rotating member from idling.

An example of an electromagnetic clutch as an example of a conventional electromagnetic coupling device is shown in FIG. 1 in a longitudinal sectional side view and in FIG. 2 in a front view. The electromagnetic clutch A shown in FIGS. 1 and 2 is constructed by magnetically adsorbing an annular plate-shaped armature 2 to the end surface 1a of a pulley 1 serving as an input rotating member. A hub 4 connected via a spring 3 is rotated together.

The hub is integrally fixed to the rotating shaft 5.

The rotating shaft 5 is an input shaft of a compressor for a car cooler, for example, and is rotated only when the armature 2 is magnetically attracted to the pulley 1, which is belt-hung to a crank pulley (not shown).

The leaf spring 3 moves the armature 2 back in the axial direction so that a small gap g is created between the pulley 1 and the armature 2 when the armature is not energized.

The return position of the armature 2 is determined by attaching a washer 20 to the flange 4A of the hub 4 and the end 3 of the leaf spring 3.
This is done by means of a disc-shaped armature stopper 7 which abuts through A and is fixed by three rivets 6.

The armature stopper 7 has protrusions 8, which the surface 2a of the armature 2 comes into contact with, at equal angle division positions of 120° near the outer periphery. The height is such that the other ends of the leaf springs 3 are slightly pushed out toward the pulley 1.

The leaf spring 3 and the armature 2 are fixed to each other by using a rivet 9 at the other end of the leaf spring 3 which projects outward from the outer peripheral edge of the armature stopper 7. That is, the leaf spring 3 contacts the rear surface of the armature stopper 7 in most part except for the vicinity of the end on the side fixed to the armature 2 pushed out by the protrusion 8 of the stopper plate 7, and the side fixed to the hub 4 comes into contact with the back surface of the armature stopper 7. The end portion 3A is clamped between the washer 20 that abuts the hub 4 and the armature stopper 7, so that a preset load is generated. Note that 21 in FIG. 1 is a washer.

In the conventional electromagnetic clutch having the above structure, the armature stopper is large and heavy, and the end 3A of the leaf spring 3 is connected to the hub 4.
The structure must be such that the washer 20 and armature stopper 7 are caulked and fixed to the flange 4A of the hub 4 with a rivet 6. Also, in order to fix the hub 4 to the rotating shaft 5, a member such as a shim to adjust the gap g is required. Since the hub 4 must be screwed to the rotating shaft 5 through the washer 21, many parts as described above are required on the output rotating member side including the armature 2, resulting in poor productivity. There is a problem, and it has been desired that some kind of countermeasure be taken against this problem.

This invention provides an electromagnetic coupling device that solves the above problems. One end is fixed to a hub that is fixed to the rotating shaft so as to be able to rotate integrally with it, and the other end is fixed to an armature. The armature is axially movably supported by the hub through three strip-shaped leaf springs, and an armature stopper that determines the return position of the armature by abutting against an end surface of the armature. In the electromagnetic coupling device fixed to the hub, the armature stopper is a trifurcated radial branch plate consisting of a central plate portion and a trifurcated radial branch portion extending radially from the central plate portion, and An insertion hole smaller than the center hole of the hub is formed at the center of the central plate part, and a rivet is formed in the branch part to pass through the one end of the strip-shaped leaf spring disposed on the outside of the branch part. By forming an insertion hole in the intermediate portion, the three-pronged radial branch plate of the armature stopper and the one end of the three strip-shaped leaf springs are integrally fixed to the hub with a rivet,
A feature of the present invention is that the central plate portion is directly attached to the end face of the rotating shaft to prevent the hub from coming off.

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

FIG. 3 shows a partially cutaway vertical side view of an example of an electromagnetic clutch B as an embodiment of the electromagnetic coupling device of this invention, and FIG. 4 shows a front view. As shown in the drawing, it has a pulley 1 as an input rotating member, an annular plate-shaped armature 2, three strip-shaped leaf springs 3', a hub 4', etc.
The electromagnetic clutch A as an example of the conventional electromagnetic coupling device shown in FIGS. 1 and 2 is different from the electromagnetic clutch A as an example of the conventional electromagnetic coupling device shown in FIGS. Although similar, the structure of the armature stopper 7' and the mounting structure of the leaf spring 3', hub 4', and armature stopper 7' are completely different from the conventional example.

The armature stopper 7' is shown in FIG. 5 as a plan view as viewed from the arrow in FIG. 6, as shown in FIG. 6 as a front view as seen in the arrow in FIG. Fig. 8 shows the bottom view in Fig. 6, and Fig. 9 shows the rear view.
As shown in FIG. 10, which is a sectional view taken along the line of FIG. 6, it is a three-pronged radial branch plate.

The right side view in FIG. 6 is omitted because it is shown symmetrically to the left side view in FIG. 6 shown in FIG.

Furthermore, the structure of the electromagnetic clutch B as an embodiment of the electromagnetic coupling device of this invention will be explained in detail with reference to FIGS. 3 to 10. is the same as the conventional example, but the center plate 7'A of the armature stopper 7' is brought into contact with the end face of the rotating shaft 5 via an adjuster shim 10, and is prevented from coming off with a screw 11.

The armature stopper 7' bends each tip of the trifurcated branch part 7'B outward to form a stepped back surface 7'a, and also forms a stepped back surface 7'a, while at the same time positioning the center plate part 7'A. An insertion hole 12 for passing a screw 11 which is smaller than the axial center hole of the hub 4' is provided in the hub 4', and an insertion hole 13 for passing the rivet 6' is provided in the intermediate portion of each branch 7'B.

A surface 2a along the inner peripheral edge of the armature 2 comes into contact with the back surface 7'a of the armature stopper 7', and the return position of the armature 2 is determined.

The leaf spring 3', which causes the armature 2 to return to its original position, is attached to the armature when the branch 7'B of the armature stopper 7' is fixed to the flange 4'A of the hub 4' with the rivet 6'. One end is fixed integrally over the surface of your stopper 7', and the other end is fixed to the surface 2a of armature 2 by rivets 9'.

That is, one end of all three leaf springs 3' is fixed to the surface facing outside of the branching part 7'B of the armature stopper 7', and the other end is fixed to the surface facing the outside of the branch part 7'B of the armature stopper 7'. It is fixed to the armature 2 whose position in the axial direction is regulated by the surface 2a coming into contact with the back surface 7'a of the bent portion of the armature 7'.
The initial deflection amount of the leaf spring 3' is determined by the axial dimension difference between the surface 7'a of the armature stopper 7' and the outer surface of the branch 7'B formed by such fixing. A preset load is obtained.

Incidentally, the rear surface 7'a may be provided with projections as shown in FIG. 1, or stopper rubbers may be fixed thereto, and the armature may be brought into contact with these projections or stopper rubbers.

In addition, the end face 1 where armature 2 magnetically attracts
An annular field core 14 faces into the annular groove 1A of the pulley 1 having a diameter a, and an electromagnetic coil 15 is housed in the field core 14, and the pulley 1 is fixed by a bearing 16. It is supported by the boss part 17 of the device, and furthermore, the pulley 1 has an arcuate hole 18 that opens at the end surface 1a.
A, 18B are formed in an intermittent arrangement on a concentric circle to form double inner and outer sides, while the armature 2 has the arcuate hole 18
It is different from the conventional example in that an arcuate hole 19 is provided facing between A and 18B, and the magnetic flux generated by applying voltage to the electromagnetic coil 14 is bent twice and passes through the armature 2, increasing the magnetic attraction force. The same is true.

The above embodiment is an example of an electromagnetic clutch that transmits torque from a pulley 1, which is an input rotating member, to a hub 4', which is an output rotating member. or armature 2 to field core 1.
An electromagnetic brake may be used which has a structure in which the magnetic field is directly attracted to the field core and brought into frictional contact with the field core side. Furthermore, although the above embodiment has shown an electromagnetic clutch having a structure in which the rib 4' is prevented from coming off from the rotating shaft 5 using the screw 11, there is a male threaded portion at the tip of the rotating shaft 5 that has a smaller diameter than the insertion hole 12 of the central plate portion 7'A. The hub 4' may be prevented from coming off with a nut screwed into this male thread.

The electromagnetic coupling device of this invention having the above-mentioned configuration has a three-pronged radial branch plate as the armature stopper 7', so that the flange 4'A of the hub 4'
Since one end of the leaf spring 3' is fixed to the outward facing surface of the armature stopper 7', assembly is extremely easy.

In particular, the armature stopper 7' is a three-pronged radial branch plate, and a leaf spring to the hub 4' is attached to the intermediate portion in the length direction of the three branch parts 7'B of the armature stopper 7'. A hole 13 for inserting a rivet is provided for fixing the rotary shaft 5, and since the adjustment shim 10 is interposed between the rotary shaft 5 and the center plate portion 7'A for direct attachment due to the structure, the rotary shaft 5
Not only does it make it easier to set the gap between the pulley 1 and the armature 2, which are supported on the equipment side having the
It is possible to significantly reduce the weight and increase the amount of deflection of the leaf spring compared to the previous model.

As is clear from the above explanation, the electromagnetic coupling device of this invention can achieve weight reduction due to the significant weight reduction of the armature stopper, and can be easily assembled by attaching the leaf spring to the outermost side. This is extremely easy to fix, and since the armature stopper branch and center plate each have the function of a washer, there is no need to use a washer for fixing.
As a result, it has many excellent advantages, such as contributing to a reduction in the number of parts.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view showing an example of an electromagnetic clutch as an example of a conventional electromagnetic coupling device, Fig. 2 is a front view of the electromagnetic clutch shown in Fig. 1, and Fig. 3 is an embodiment of the electromagnetic coupling device of this invention. 4 is a front view of the electromagnetic clutch shown in FIG. 3, and FIGS. 5 to 10 show the armature stop in the electromagnetic coupling device of this invention. 5 is a plan view as viewed from the arrow in FIG. 6, FIG. 6 is a front view as viewed from the arrow in FIG. 5, FIG. 7 is a left side view of FIG. 6, and FIG. 8 is a bottom view of FIG. 6. , Figure 9 is the 6th
The rear view of the figure and FIG. 10 are a sectional view taken along the line of FIG. 6. In the drawings, 1...pulley, 2... armature, 3'... leaf spring, 4'... hub, 4'A...
Flange, 5... Rotating shaft, 6'... Rivet,
7'... Armature stopper, 7'A... Center plate, 7'B... Branch, 7'a... Back, 9'...
Rivet, 10... Adjustment shim, 11... Screw, 12, 13... Insertion hole, 14... Field core, 15... Electromagnetic coil.

Claims (1)

[Scope of utility model registration request] The armature is attached to the hub in the axial direction via three strip-shaped leaf springs, one end of which is fixed to a hub that is fixed to the rotary shaft so as to be able to rotate integrally with the rotating shaft, and the other end of which is fixed to the armature. An electromagnetic coupling device in which an armature stopper is movably supported and fixed to the hub to determine the return position of the armature by coming into contact with an end surface of the armature, wherein the armature stopper is fixed to the hub. A trifurcated radial branching plate consisting of a central plate portion and a trifurcated radial branching portion extending radially from the central plate portion, and an insertion hole smaller than the central hole of the hub is formed in the center of the central plate portion, On the other hand, a rivet insertion hole is formed in the intermediate portion of the branch portion to pass through the one end portion of the strip-shaped leaf spring disposed on the outside of the branch portion, so that the armature stopper can be inserted with the rivet. integrally fixing the three-pronged radial branch plate and the one end portion of the three strip-shaped leaf springs to the hub,
An electromagnetic coupling device characterized in that the center plate portion is directly attached to an end face of the rotating shaft to prevent the hub from coming off.