JPS6128499Y2 - - Google Patents

Description

[Detailed description of the invention] This invention forms a magnetic path with an electromagnet core consisting of an inner core and an outer core, a non-magnetic magnetic path cutting plate, and a movable core, and when the magnet coil is deenergized, the magnetic This invention relates to an improvement in an electromagnetic brake device that ensures that the road is cut off.

Conventional products of this kind have a plastic magnetic path cutting plate glued to the end of the inner core opposite to the movable core, so the magnetic path cutting plate can impact the movable core that makes up the moving body. Moreover, the magnetic path cutting plate has the disadvantage that it is easily damaged by direct contact.

This idea was made in view of the above-mentioned conventional situation, and was made with the aim of providing a highly reliable electromagnetic brake device with less damage to the magnetic path cutting plate. An embodiment of this invention will now be described. In the figure, reference numeral 1 denotes a fixed part consisting of a frame of an electric motor, which has a brake box 1A surrounding a brake disc (to be described later) on the opposite load side, and a pair of axial slits 1Aa, 1Aa ( (Only one side is shown in the figure) is formed. 2 is an electric motor shaft rotatably supported by a ball bearing 3 supported by a fixed part 1;
It has a spline portion 2A at the end on the opposite load side. Reference numeral 4 denotes a brake whose inner peripheral part is fitted into the spline part 2A for free axial movement, and one brake lining 4A of the brake linings 4A and 4B provided on both sides of the outer peripheral part faces the fixed part 1. The disc 5 is a movable iron core that is movable in the axial direction and has one side facing the brake lining 4B on the other side of the brake disc 4, and has a pair of protrusions 5A, 5A (only one shown) formed on the outer peripheral edge. It is designed to prevent rotation by fitting loosely into the pair of slits 1Aa and 1Aa. Reference numeral 6 denotes an electromagnet that is detachably attached to the opposite end of the fixed part 1, and is attached concentrically to a bottomed cylindrical outer core 61 whose side opposite to the other side of the movable core 5 is open. The magnet has an engaging portion 62Aa on its inner periphery, that is, the inner periphery of the coil spool 62A, and is made of an inner flange that engages with a brake spring, which will be described later. net coil 62
A brake spring 6 is supported by the inner circumferential portion of the magnet coil 62, and has one end and the other end pressed into engagement with the other side of the movable iron core 5 and the engaging portion 62Aa, respectively.
3, and is supported by the inner peripheral part of this brake spring 63, one end of which coincides with the opening side tip of the outer core 61 in the axial direction, and a large diameter part 64A at the other end.
A resin magnet attached to the inner surface of the bottom of the inner core 61 is configured such that the engaging portion 62Aa is sandwiched between the large diameter portion 64A and the other end of the brake spring 63. It is composed of a road cutting board 65.

In the device configured in this way, when the magnet coil 62 is not energized as shown in the figure,
Since the brake spring 63 presses the movable iron core 5 and the brake lining 4B, and the brake lining 4A and the fixed part 1, a braking torque acts on the motor shaft 2 that engages with the brake disc 4. Furthermore, when the magnetic coil 62 is energized, the outer core 61 and the inner core 64 are magnetized, and the movable core 5 is attracted and moved under the spring pressure of the brake spring 63 so as to come into contact with the outer core 61 and the inner core 64. The movable iron core 5 and the brake lining 4
Since the press-contact state between the fixed part 1 and the brake lining 4A and the brake lining 4A is released, the electric motor 2 can freely rotate. Thereafter, when the magnet coil 62 is deenergized, the magnetic path consisting of the outer core 61, the magnetic path cutter plate 65, the inner core 64, and the movable core 5 is reliably and easily cut by the action of the magnetic path cutter plate 65. be done. Further, since the movable core 5 serving as a moving body does not come into contact with the magnetic path cutting plate 65, the magnetic path cutting plate 65 is hardly damaged. In addition, the inner core 6
Since the large diameter portion 64A is provided at the other end of the magnetic path cutting plate 64A, the surface pressure on the magnetic path cutting plate 65 is reduced compared to a case where the large diameter portion 64A is not provided, which is effective in preventing damage. Note that the means for fixing the inner core 64 and the magnetic path cutting plate 65 in position is not limited to the structure of the above embodiment, but as in the above embodiment, the means for fixing the inner core 64 and the magnetic path cutting plate 65 in place is fixed to the bottom inner surface of the outer core 61 and the brake spring. 63 is convenient because no particular fixing means is required.

As described above, this device forms a magnetic path with an electromagnetic core consisting of an inner core and an outer core, a magnetic path cutting plate made of a non-magnetic material, and a movable core, and when the magnet coil is deenergized, the magnetic In an electromagnetic brake device in which a road is reliably cut off, the outer core has a cylindrical shape with a bottom and is separate from the inner core, and the outer core has a bottom inner surface and an end of the inner core. In addition to arranging the magnetic path cutting plate between them, the inner core and the magnetic path cutting plate are fixed in position, so that the magnetic path cutting plate is not damaged and is highly reliable. effective.

[Brief explanation of the drawing]

The figure is a sectional view of a main part of an embodiment of this invention. In the figure, 1 is the fixed part, 4 is the brake disc, 4
A, 4B are brake linings, 5 is a movable iron core,
6 is an electromagnet, 61 is an outer core, 62 is a magnet coil, 62Aa is an engaging portion, 63 is a brake spring, 64 is an inner core, 64A is a large diameter portion, and 65 is a magnetic path cutting plate.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An iron core of an electromagnet that, when a magnetic coil is energized, absorbs the movable iron core against the spring pressure of the brake spring that presses the brake disc against the fixed part and releases the pressure contact. It is composed of an inner iron core and an outer iron core, and a non-magnetic part is provided in a part of the magnetic path formed in cooperation with the movable iron core, so that the magnetic path is reliably broken when the magnetic coil is deenergized. The outer core has a cylindrical shape with a bottom and is separate from the inner core, and a non-magnetic material is provided between the bottom inner surface of the inner core and the end of the inner core. An electromagnetic brake device characterized in that a magnetic path cutting plate is provided, and the inner core and the magnetic path cutting plate are fixed in position. (2) The electromagnetic brake device according to claim 1, characterized in that the area of both ends of the magnetic path cutting plate is larger than the area of the movable core side end of the inner core. (3) The electromagnetic device according to claim 1 or 2, wherein the brake spring always biases the inner core and the magnetic path cutting plate toward the bottom of the outer core. Brake device.