JPH0747624Y2 - Electromagnetic clutch / brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electromagnetic clutch / brake, more specifically, an excitation release type, in which an armature receives an electromagnetic attraction force when a coil housed in a yoke is excited. The inner disc, which is attracted to the yoke side by the magnet and is interposed between the yoke and the plate, becomes rotatable, and when the coil is released from the excited state, the armature is pressed against the plate side by the spring force. In the electromagnetic clutch / brake that transmits the rotational force or the braking force to the rotating shaft that is connected to the inner disc via the hub spline-fitted to the inner disc that cannot rotate,
The present invention relates to an electromagnetic clutch / brake that reduces noise generated from a spline portion during rotation of the inner disc and the hub.

[Prior Art] Electromagnetic clutches and brakes require electric power as a drive source, and do not require a special pressure generator unlike hydraulic and pneumatic types. It is widely used for power transmission or braking of general equipment except construction machinery and vehicles.

Some conventional electromagnetic clutches / brakes have the same structure as the “electromagnetic clutches / brakes” of Japanese Patent Application No. 1-837 filed by the present applicant, and the electromagnetic clutches / brakes are shown in FIG. ) (B), in the figure, 1 is an annular yoke, 2 is a coil housed in the yoke 1, 3 is arranged facing the coil 2, and a rotary shaft (not shown) ), Which is capable of moving forward and backward in the axial direction, 4 is a plate arranged axially opposite to the yoke 1 with respect to the armature 3, 5 is an inner disk arranged intermediate between the armature 3 and the plate 4, 6 Is a hub spline-fitted to the inner disk 5 and connected to a rotating shaft (not shown), and 7 is for adjusting the magnetic gap length between the magnetic pole portion of the yoke 1 and the armature 3 facing the magnetic pole portion. With the adjustment bolt of That.

A spring (not shown) for pressing the armature 3 against the plate 4 via the inner disc 5 to generate a transmission torque or a braking torque on the inner disc 5,
The yoke 1 is inserted into holes provided at several locations in the circumferential direction.

When the electromagnetic clutch / brake constructed as described above is used as a brake, the yoke 1 is fixed to an appropriate fixed body so as not to rotate, and the hub 6 is coupled with the braked shaft. When no current is supplied to the coil 2, the armature 3 is pressed toward the plate 4 by the force of a spring (not shown), and the inner disk 5 is effectively pinched by the armature 3 and the plate 4. As a result, a braking force is generated on the pressing surfaces of the two, the braked shaft is braked via the hub 6 spline-fitted to the inner disc 5, and a current is supplied to the coil 2. 3 receives the electromagnetic attraction force and is attracted to the yoke 1 side against the force of the spring (not shown), so that the clamping force on the inner disk 5 is removed and the braking on the braked shaft is released.

When the electromagnetic clutch / brake is used as a clutch, the yoke 1 is rotatably attached to the rotating body, and the drive shaft is coupled to the hub 6. The operation is similar to that when used as the above-mentioned brake.

[Problems to be Solved by the Invention] However, in the electromagnetic clutch / brake shown in FIGS. 3 (A) and 3 (B) described above, the inner disc 5 and the hub 6 are spline-fitted to each other, and the spline teeth are mutually interposed. Since there is a gap between the spline teeth, the meshing spline teeth repeatedly collide with each other when the inner disk vibrates in the rotation direction when the inner disk rotates, and noise is generated from the spline teeth, which may cause anxiety and discomfort to the user. Therefore, it has been desired to reduce the noise.

As a device for responding to the request, there is also "Electromagnetic clutch or electromagnetic brake that does not generate noise" in Japanese Utility Model Publication No. 50-15092, but a simpler structure is desired because of its complicated structure. It was rare.

[Means for Solving the Problems] In order to solve the above-mentioned problems and reduce noise with a simple structure, the present invention faces a yoke, a coil housed in the yoke, and the coil. Armature, which is arranged in the axial direction of the rotary shaft, and is movable back and forth, a plate arranged axially opposite to the yoke with respect to the armature, and an inner member arranged between the armature and the plate. A disk, a hub spline-fitted to the inner disk and connected to the rotating shaft, and an adjusting bolt for adjusting a magnetic gap length between the magnetic pole portion of the yoke and the armature facing the magnetic pole portion. In the electromagnetic clutch / brake including the hub, the hub spline-fitted to the inner disc includes a boss portion and a thin plate-shaped spline portion, and It is an object of the present invention to provide an electromagnetic clutch / brake in which the impact of the vibration of the inner disk can be alleviated by the elasticity of the spline portion.

[Embodiment] An embodiment of an electromagnetic clutch / brake according to the present invention will be described below with reference to FIGS. 1 (A) and (B) and FIG.

1 (A) and (B) show a first embodiment of a hub included in an electromagnetic clutch / brake according to the present invention, and FIG. 2 shows a second embodiment of a hub included in an electromagnetic clutch / brake according to the present invention.
It shows an embodiment, and the basic structure and operation of the electromagnetic clutch / brake are substantially the same as the conventional one shown in FIGS. 3 (A) and 3 (B) except for the hub 6.

The hub according to the present invention is different from the conventional one in the following points.

In the first embodiment shown in FIGS. 1A and 1B, the hub 10 serves to transmit the torque of the rotating shaft (not shown) to the inner disk (5 in FIG. 3). Ten
The a and the spline portion 10b are integrally connected, and the portion connected to the rotating shaft is the boss portion 10a, which is no different from the conventional hub 6 in FIG.

However, unlike the conventional one, the spline portion 10b that is spline-fitted with the inner disc 5 is formed in a thin plate shape, and thus the elasticity of the thin plate-shaped spline portion 10b can reduce the impact due to the vibration of the inner disc 5. It is like this.

Further, the thin plate-shaped spline portion 10b has a notch portion 1 facing each other.
It is also possible to change each of the shapes of 0c as shown in FIG. 1 (B) so as to be asymmetric as a whole so as to reduce the resonance, or to make the thin plate-like spline portion 10b by the damping steel plate to absorb the vibration. You can also do so.

The second embodiment of FIG. 2 is similar to the first embodiment of FIG. 1 in that the hub 11 includes the boss portion 11a and the thin plate-like spline portion 11b, but the hub 11 includes the boss portion 11a and the spline portion. The portion 11b is integrally joined with the screw 11d with the elastic or viscous elastomer 11c interposed therebetween, and the impact is further reduced.

The boss portion 11a and the spline portion 11b may be joined by welding, caulking or the like instead of the screw 11d.

[Advantages of the Invention] The electromagnetic clutch / brake according to the present invention is configured as described above, and since the spline portion of the hub fitted with the inner disk is thin, it has a spring action and has a simple structure. Can reduce noise.

Further, if the shapes of the notches facing each other of the thin plate-like spline portion are changed so as to be asymmetric as a whole, resonance can be reduced and noise can be further reduced. It is even more effective if used.

If an elastomer is sandwiched between the hub boss portion and the thin plate-like spline portion, the effect can reduce the impact due to the vibration of the inner disk and reduce the noise.

[Brief description of drawings]

FIG. 1 (A) is a sectional side view of a first embodiment of a hub included in an electromagnetic clutch / brake according to the present invention, FIG. 1 (B) is a front view of FIG. 1 (A), and FIG. A sectional side view of a second embodiment of a hub included in an electromagnetic clutch / brake according to the present invention, FIG. 3 (A) is a sectional side view of a conventional electromagnetic clutch / brake, and FIG. 3 (B) is FIG. 3 (A). ) Is a front view of FIG. 1 …… Yoke 2 …… Coil 3 …… Armature 4 …… Plate 5 …… Inner disk 6 …… Hub 7 …… Adjustment bolt 10 …… Hub 10a …… Boss portion 10b …… Spline portion 10c …… Notch portion 11 …… Hub 11a …… Boss 11b …… Spline 11c …… Elastomer 11d …… Screw

Claims (4)

[Scope of utility model registration request] 1. A yoke, a coil housed in the yoke, an armature that is arranged so as to face the coil and can move forward and backward in the axial direction of a rotating shaft, and the yoke is axially opposite to the armature. A plate disposed on the side,
An inner disc disposed between the armature and the plate, a hub spline-fitted to the inner disc and connected to the rotating shaft, a magnetic pole portion of the yoke, and the armature facing the magnetic pole portion. An electromagnetic clutch / brake comprising an adjusting bolt for adjusting a magnetic gap length between the hub, the hub spline-fitted to the inner disk includes a boss portion and a thin plate-like spline portion, The electromagnetic clutch / brake is characterized in that the elasticity of the spline portion can reduce the impact caused by the vibration of the inner disc. 2. The electromagnetic clutch / brake according to claim 1, wherein the cutout portions of the thin plate-like spline portion facing each other are asymmetric in shape to reduce resonance. 3. The electromagnetic clutch / brake according to claim 1, wherein the thin plate-like spline portion is made of a vibration-damping steel plate to absorb vibration. 4. The electromagnetic clutch / brake according to claim 1, wherein an elastomer is interposed between the boss portion and the thin plate-like spline portion.