JPH0625718Y2 - Connection structure of armature and hub in electromagnetic clutch etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a structure for connecting an armature and a hub in an electromagnetic clutch or electromagnetic brake.

(Prior Art) An outline of, for example, an electromagnetic clutch to which the present invention is applied will be described with reference to FIG. Hub 2 with gear 1 engraved on the outer circumference
The hub 2 is slidably fitted to the rotary shaft 3, and the hub 2 is connected to an armature 5 via a leaf spring 4. On the opposite surface of the armature 5, a rotor 7 having a lining 6 with a constant gap G is provided.
Is engaged with the rotary shaft 3 by a key 8. On the side opposite to the armature 5 of the rotor 7, a stator 10 containing an exciting coil 9 is arranged at a distance, and the stator 10 is attached to a fixing member (not shown).

The operation of the electromagnetic clutch is such that when the excitation coil 9 is energized while the gear 1 is engaged with the gear of a drive device (not shown) and the hub 2 is rotationally driven, a magnetic flux Φ is generated and a magnetic field as indicated by a broken line is generated. Since a circuit is formed and the armature 5 is attracted to the rotor 7 side against the elastic force of the leaf spring 4, the rotation on the drive side is transmitted to the rotating shaft 3 via the hub 2, the armature 5 and the rotor 7. It When the energization of the exciting coil 9 is stopped, it is demagnetized, the armature 5 is separated from the rotor 7 by the elastic force of the leaf spring 4, and the rotary shaft 3 stops.

An example of the structure for connecting the armature and the hub in this type of electromagnetic clutch is, for example, Japanese Utility Model Laid-Open No. 61-1085.
There is one disclosed in Japanese Patent No. 30. In the electromagnetic clutch disclosed in this publication, as shown in FIGS. 5 and 6, the hub 2 having the gear 1 is molded with a thermoplastic plastic material,
The hub 2 has a cylindrical protrusion 1 protruding toward the rotor 7.
The annular groove 13 formed by 2 is provided at a plurality of locations along the circumferential direction. The leaf spring 4 has a through hole 1 for attaching the outer peripheral side to the armature 5 with a rivet 14.
5 is provided, and a cylindrical flanged through hole 16 for attaching the inner peripheral side to the hub 2 is provided.
The through hole 16 is formed by integrally forming a cylindrical flange 17 on the peripheral edge of the opening by a burring process, a drawing process, or another press process. The cylindrical flange 17 is fitted into the annular groove 13, and the through hole 16 is formed. The protruding tip of the cylindrical projection 12 penetrating through is welded to a plate spring integrally fixed to the hub 2.

(Problems to be solved by the invention) However, the leaf spring 4 is punched out by, for example, a press to form a through hole 16 and at the same time, the cylindrical flange 1 is formed on the periphery thereof.
In order to form 7, the material of the leaf spring 4 has a thickness of 0.2.
Processing is difficult unless a thin one of m / m to 0.7 m / is used.

For this reason, the flatness of the through hole 16 and the tubular flange 17 and the leaf spring 4 does not become a right angle, and the tubular flange 1
Unwanted force acts on the flat surface at the time of molding 7 to make it easy to bend. . As a result, when the armature 5 is attached to the hub 2 via the leaf spring 4, the bending of the leaf spring 2 causes a large surface wobbling of the armature 5, and the rotor 7 and the stator 10 provided on the facing surface of the armature 5 are large. The gap between and is not kept constant, and there is a drawback that the torque during operation varies. Further, in order to reduce this variation, it is necessary to select the finished leaf springs 4 and make adjustments at the time of assembling, so that there are drawbacks such that the yield is deteriorated and the cost is increased.

Then, this invention aims at provision of the electromagnetic clutch and brake device which can solve the subject of the above-mentioned prior art.

(Means for Solving the Problems) The gist of the present invention is that a disc-shaped leaf spring is interposed between an armature and a hub, and the outer and inner face plates of the leaf spring are arranged in the circumferential direction. In an electromagnetic clutch or the like, which is attached to an armature and a hub at a plurality of locations to connect the armature and the hub, a through hole is formed in each attachment point of the leaf spring, and at least the inner circumference of the through hole is formed. A retainer integrally formed with a flange portion that abuts the hub-side hole edge of the through hole and a tubular portion that fits into the through hole is attached to the through hole on the side, and the annular recessed portion is formed on the hub. A protrusion protruding from the center of the groove to the leaf spring side is provided, the flange of the retainer is fitted in the annular groove of the hub, and the protrusion of the hub is inserted into the tubular portion of the retainer. Fix the tip side of the protrusion to the leaf spring with the fixing means. It is the connecting structure of the armature and the hub.

(Embodiment) The present invention will be described below based on the embodiment shown in FIGS. 1 to 3. In the present embodiment, the same members as those of the conventional example described with reference to FIG. 4 are designated by the same reference numerals and illustrated, and detailed description thereof will be omitted.

As shown in FIG. 1, in the electromagnetic clutch having substantially the same structure as the conventional example, the structure for connecting the hub 21 and the armature 5 via the leaf spring 20 is as shown in FIGS. 2 and 3.

The leaf spring 20 has a disk shape having a central hole 23 into which the cylindrical portion 22 of the hub 21 is fitted, and the rivet 14 is provided on the outer peripheral side thereof.
A plurality of penetrating pieces 24 for attaching to the armature 5 are evenly spaced along the circumferential direction (120 ° in the embodiment).
A plurality of penetrating pieces 25 for attaching to the hub 21 are equally spaced along the circumferential direction (three locations at 120 ° intervals in the embodiment) on the inner circumference side. Has been drilled. The through hole 24 and the through hole 25 are provided so as not to overlap each other in the radial direction.

A gear 26 that engages with a gear of a drive device is engraved on the outer peripheral side of the hub 21, and the rotary shaft 3 is inserted into the cylindrical portion 22 and slidably rotatably engaged. This is similar to the case of the conventional example. The face plate between the cylindrical portion 22 and the gear 26 is provided with a plurality of protrusions 27 protruding toward the armature 5, and an annular groove 28 is formed around the protrusions 27.

Retainer 2 interposed between the leaf spring 20 and the hub 21
Reference numeral 9 denotes a tubular portion 30 into which the protrusion 27 is inserted inside and the outside is fitted into the through hole 25, and is integrally provided on the outer periphery of the tubular portion 30 on the base side and is provided in the annular groove 28. It is composed of a flange portion 31 to be fitted.

Then, the leaf spring 20 and the hub 2 are inserted through the retainer 29.
As shown in FIG. 2 (A), the retainer 29 is made of a thermoplastic plastic material, and the protruding portion 2 protruding from the through hole 25 is used as the fixing means.
The tip leaf spring 20 of No. 7 is welded W. Further, as shown in FIG. 2 (B), a screw hole 32 is bored in the protrusion 27 to form a screw B.
It is also possible to screw it with or tap it with a tapping screw after making a prepared hole.

Although not described, the structure for connecting the armature and the hub can be applied to an electromagnetic brake having the same structure.

(Effect of the Invention) As is apparent from the above-described embodiment, in the present invention, the leaf spring is attached to the hub through the retainer, so that the leaf spring does not wear and the transmission force is received on the entire surface of the hub and the retainer. Therefore, it can be transmitted with great force. Also, since the leaf spring only has a hole in the plane, the hole and the plate are machined at right angles, less surface wobbling occurs during assembly, stable performance is obtained, and the yield is good and the cost is low. it can.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an upper half of an electromagnetic clutch using an armature-hub connecting structure according to the present invention, FIG. 2 is an enlarged sectional view of the connecting structure, and FIG. 3 is an exploded perspective view of the connecting structure. FIG. 4 is an overall front view showing in cross section the upper half of an electromagnetic clutch using the conventional armature-hub coupling structure, and FIG. 5 is an overall front showing the upper half of the hub used in the structure in cross section. FIG. 6 and FIG. 6 are vertical sectional views of a leaf spring used in the structure. [Explanation of reference symbols] 3 ... Rotating shaft, 5 ... Armature 6 ... Lining, 7 ... Rotor 8 ... Key, 9 ... Excitation coil 10 ... Stator, 20 ... Leaf spring 21 ... Hub, 22 …… Cylindrical part 23 …… Center hole, 24,25 …… Through hole 26 …… Gear, 27 …… Projection part 28 …… Annular groove, 29 …… Retainer 30 …… Cylindrical part, 31 …… Flange part 32 …… Screw hole, B …… Screw W …… Welding

Claims (1)

[Scope of utility model registration request] 1. A disc-shaped leaf spring is interposed between an armature and a hub, and the outer and inner face plates of the leaf spring are attached to the armature and the hub at a plurality of locations along the circumferential direction, respectively. In the electromagnetic clutch or the like in which the armature and the hub are connected to each other, a through hole is formed at each attachment point of the leaf spring, and at least the through hole on the inner peripheral side of the through hole is
A retainer integrally formed with a flange portion that abuts on the hub-side hole edge of the through hole and a tubular portion that fits into the through hole is attached, and the hub is located on the leaf spring side from the center of the annular groove formed in the hub. A protruding portion is provided, the flange portion of the retainer is fitted into the annular groove of the hub, and the protruding portion of the hub is inserted into the tubular portion of the retainer to fix the tip end side of the protruding portion. A structure for connecting the armature and the hub that is fixed to the leaf spring by means.