JPH076531U - Electromagnetic clutch / brake - Google Patents

Abstract

(57) [Summary] [Object] A yoke, a coil housed in the yoke and a bobbin for supporting the coil, and an armature which is arranged so as to face the coil and can move forward and backward in the axial direction of a rotating shaft. A plate disposed axially opposite to the yoke with respect to the armature, an inner disk intermediate between the armature and the plate and coupled to the rotary shaft via a hub, and the armature. In an electromagnetic clutch / brake including a compression spring for pressing the plate side through the inner disk, the conventional structure in which the plate is fixed to the yoke through a gap adjusting collar is simplified. Aim to reduce costs. [Structure] The bobbin 28 is resin-molded so as to have several protruding portions 28A, and the outer peripheral portion of the plate 23 is held and fixed to the tip of the protruding portion 28A by ultrasonic welding, heat welding or the like.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an electromagnetic clutch / brake, specifically, a non-excitation actuated type, that is, an excitation released type, in which when the coil housed in the yoke is excited, the armature is moved to the yoke side by the electromagnetic attraction force. The inner disc, which is sucked and interposed between the armature and the plate, becomes rotatable, and when the coil is released from the excited state, the armature is pressed toward the plate by the force of the compression spring. This relates to electromagnetic clutches / brakes that transmit the rotational force or the braking force to the rotating shaft that is connected to the inner disc via the hub, because the inner disc cannot rotate.

[0002]

[Prior art]

 Electromagnetic clutches and brakes only require electric power as a drive source and do not require a special pressure generator like hydraulic and pneumatic types, so industrial machinery, construction machinery, and vehicles that require large power. It is widely used for power transmission or braking of general equipment except the above. Some conventional electromagnetic clutches / brakes are configured as shown in FIG. 2, for example. In the figure, 8 is an annular yoke, 9 is a coil accommodated in the yoke 8, 10 is a bobbin for supporting the coil 2, 2 is arranged so as to face the coil 9, and a rotating shaft (not shown) is provided. An armature 3 that can move forward and backward in the axial direction is a plate disposed axially opposite to the york 8 with respect to the armature 2, and a plate 4 is located between the armature 2 and the plate 3 and is connected so as not to rotate relative to each other. The inner disk is connected to a rotating shaft (not shown) via a hub 5. A compression spring 1 for pressing the armature 2 against the plate 3 via the inner disk 4 to generate a transmission torque or a braking torque on the inner disk 4 is provided at several points in the inner peripheral direction of the outer peripheral portion of the yoke 8. Has been inserted into the hole. The plate 3 is fixed to the outer peripheral portion of the yoke 8 at several points in the circumferential direction by screws 6 via a gap adjusting collar 7, a nut 12 and a spring washer 11. When the electromagnetic clutch / brake constructed as described above is used as a brake, the yoke 8 is fixed to an appropriate fixed body so as not to rotate, and the hub 5 is connected to the braked shaft. When no current is supplied to the coil 9, the armature 2 is pressed toward the plate 3 side by the force of the compression spring 1, and the inner disc 4 is effectively pinched by the armature 2 and the plate 3. As a result, a braking force is generated on the clamping surfaces, the braked shaft is braked via the hub 5 that is connected to the inner disk 4 so as to be relatively non-rotatable, and a current is supplied to the coil 9. Then, the armature 2 receives an electromagnetic attraction force and is attracted to the yoke 8 side against the force of the compression spring 1. Therefore, the clamping force on the inner disc 4 is removed, and the braking on the braked shaft is released. Be touched. When the electromagnetic clutch / brake is used as a clutch, the yoke 8 is attached to the rotating body so as to rotate, and the drive shaft is connected to the hub 5. The action is the same as when the above-mentioned brake is used. It is supposed to follow.

[0003]

[Problems to be solved by the device]

 However, the conventional electromagnetic clutch / brake shown in FIG. 2 has a problem that the structure for fixing the plate 3 to the yoke 8 via the gap adjusting color 7 is complicated.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a yoke, a coil housed in the yoke and a bobbin supporting the coil, and an advancing unit in the axial direction of the rotating shaft that is disposed so as to face the coil. A retractable armature, a plate axially opposite to the yoke with respect to the armature, a plate intermediate between the armature and the plate, and connected to the rotary shaft via a hub. In an electromagnetic clutch / brake including an inner disc and a compression spring for pressing the armature to the plate side through the inner disc, the bobbin is resin-molded to have several protrusions, and What is provided is one in which the outer peripheral portion of the plate is held and fixed by ultrasonic welding, heat welding or the like to the tip of the protrusion. A.

[0005]

[Action]

 The electromagnetic clutch / brake having the above-described structure has a screw 6, a spring washer 11 and a nut 12 for fixing the plate 3 to the yoke 8 via the gap adjusting collar 7 as shown in the conventional structure of FIG. Is unnecessary, and tapping for the screw 6 on the yoke 8 is not necessary.

[0006]

【Example】

 An embodiment of an electromagnetic clutch / brake according to the present invention will be described below with reference to FIG. The basic structure of the electromagnetic clutch / brake is the same as that of the conventional electromagnetic clutch / break shown in FIG. 2. As shown in FIG. 1, the yoke 26, the coil 27 housed in the yoke 26, and the coil thereof are arranged. A bobbin 28 that supports the armature 22, an armature 22 that faces the coil 27 and can move forward and backward in the axial direction of a rotating shaft (not shown), and a yoke 26 that is axially opposite to the armature 22. A plate 23, an inner disk 24 located between the armature 22 and the plate 23 and connected to the rotary shaft via a hub 25, and for pressing the armature 22 to the plate 23 side via the inner disk 24. And a compression spring 21 of. In the electromagnetic clutch / brake according to the present invention, the bobbin 28 is resin-molded so as to have several protrusions 28A, and the outer periphery of the plate 23 is welded to the tip of the protrusion 28A by ultrasonic welding or heat welding. It is designed to hold and fix the part.

[0007]

[Effect of device]

 Since the electromagnetic clutch / brake according to the present invention is configured as described above, it has the following effects. The screws, spring washers, nuts, and gap adjusting collars shown in FIG. 2 are not required, and the cost can be reduced by reducing the number of parts. Also, since the tapping process for the screw shown in FIG. 2 is unnecessary, the wall thickness of the outer pole portion of the yoke can be reduced, and the yoke can be press-molded.

[Brief description of drawings]

FIG. 1 shows an embodiment of an electromagnetic clutch / brake according to the present invention, (A) is a vertical sectional side view, and (B) is (A).
FIG.

FIG. 2 is a vertical sectional side view of a conventional electromagnetic clutch / brake.

[Explanation of symbols]

 21: compression spring 22: armature 23: plate 24: inner disc 25: hub 26: yoke 27: coil 28: bobbin 28A: protrusion

Claims (1)

[Scope of utility model registration request] 1. A yoke, a coil housed in the yoke and a bobbin that supports the coil, 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 armature. On the other hand, a plate disposed axially opposite to the yoke, an inner disc intermediate between the armature and the plate and coupled to the rotary shaft via a hub, and the armature to the inner disc. In an electromagnetic clutch / brake including a compression spring for pressing it toward the plate via the bobbin, the bobbin is resin-molded to have several protrusions, and ultrasonic welding, heat welding, etc. is applied to the tip of the protrusion. An electromagnetic clutch / brake in which the outer peripheral portion of the plate is held and fixed by the.