JPH076532U - Electromagnetic clutch / brake - Google Patents

Abstract

(57) [Abstract] [Objective] A yoke, a coil housed in the yoke and a coil 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 disc 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 disc, in order to reduce the cost by eliminating the processing of a plurality of holes for assembling the compression spring in the yoke. .. [Structure] The coil bobbin 20 has a plurality of compression spring holes 21 in the inner peripheral portion thereof, and the plurality of compression springs 11 are respectively incorporated in the compression spring holes 21.

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 coil bobbin for supporting the coil 2, 2 is arranged so as to face the coil 9, and a rotary shaft (not shown) is provided. An armature 3 that can move forward and backward in the axial direction is a plate that is disposed on the axially opposite side of the yoke 8 with respect to the armature 2. The inner disk is connected to a rotating shaft (not shown) via the 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 by screws 6 at several points in the circumferential direction via a gap adjusting collar 7. In the conventional example shown in FIG. 2, the compression spring 1 is incorporated in each of a plurality of holes for the compression spring provided in the outer pole portion of the yoke 8, but the holes for the compression spring are formed in the inner pole of the yoke 8. Some are provided in the department. 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 the coil 9 is not supplied with current, the armature 2 is pressed toward the plate 3 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 the electromagnetic attraction force and is attracted to the yoke 8 side against the force of the compression spring 1, so that the clamping force on the inner disc 4 is removed and the braking on the braked shaft is released. . 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 coupled to the hub 5, the operation of which is used as the above-mentioned brake. It is adapted to the case.

[0003]

[Problems to be solved by the device]

 However, in the conventional electromagnetic clutch / brake shown in FIG. 2, the outer pole portion and the inner pole portion of the yoke 8 accommodate the compression spring 1 and the screw 6, so that the wall thickness is greater than required due to the magnetic characteristics. It is necessary to increase the thickness, which makes it difficult to press-form the yoke 8.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a yoke, a coil housed in the yoke and a coil bobbin that supports the coil, and a forward and backward movement in the axial direction of the rotating shaft that is disposed so as to face the coil. A possible armature, a plate axially opposite the yoke with respect to the armature, an inner disk intermediate the armature and the plate and connected to the rotary shaft via a hub. And a compression spring for pressing the armature to the plate side via the inner disc, the coil bobbin has a plurality of compression spring holes provided in an inner peripheral portion thereof. It is intended to provide a plurality of compression springs, each of which is incorporated in the compression spring hole.

[0005]

[Action]

 The non-excitation actuated brake with the above-mentioned configuration eliminates the need to machine a plurality of holes for assembling the compression spring, as compared with the conventional configuration shown in Fig. 2, and the outer and inner pole parts of the yoke are The thickness of the yoke is the minimum required for the magnetic circuit, and it can be made quite thin. Therefore, the yoke can be press-formed as compared with the conventional cutting work.

[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 18, the coil 19 accommodated in the yoke 18, and the coil thereof are provided. A coil bobbin 20 that supports the armature, an armature 12 that faces the coil 19 and that can move forward and backward in the axial direction of a rotating shaft (not shown), and an armature 12 that is axially opposite to the yoke 18 in the axial direction. And the inner disk 14 which is located between the armature 12 and the plate 13 and which is connected to the rotary shaft via the hub 15 and the armature 12 is pressed to the plate 13 side via the inner disk 14. And a compression spring 11 for The plate 13 is fixed to the outer peripheral portion of the yoke 18 at several positions in the circumferential direction by screws 16 via gap adjusting collars 17. In the electromagnetic clutch / brake according to the present invention, the coil bobbin 20 is provided with a plurality of compression spring holes 21 in the inner peripheral portion thereof, and the plurality of compression springs 11 are incorporated in the compression spring holes 21, respectively. There is.

[0007]

[Effect of device]

 Since the electromagnetic clutch / brake according to the present invention is configured as described above, it has the following effects. Since it is not necessary to machine a plurality of holes for incorporating compression springs, it is possible to reduce costs. The outer and inner pole parts of the yoke can be made as thin as the minimum thickness required for the magnetic circuit, and can be made considerably thin. For this reason, the yoke can be press-formed from the conventional cutting process, leading to a significant cost reduction and weight reduction.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an embodiment of an electromagnetic clutch / brake according to the present invention.

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

[Explanation of symbols]

 11: compression spring 12: armature 13: plate 14: inner disc 15: hub 16: screw 17: gap adjusting collar 18: yoke 19: coil 20: coil bobbin 21: hole for compression spring

Claims (1)

[Scope of utility model registration request] 1. A yoke, a coil housed in the yoke and a coil 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 the electromagnetic clutch / brake including a compression spring for pressing the plate toward the plate via the coil bobbin, a plurality of compression spring holes are provided in an inner peripheral portion of the coil bobbin, and the plurality of compression springs are respectively provided for the compression spring. Electromagnetic clutches and brakes characterized by being incorporated in holes.