JPH0636347Y2 - Magnetic particle type electromagnetic braking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a braking device, and more particularly to an electromagnetic braking device using magnetic particles.

"Prior Art" A conventional magnetic particle type electromagnetic braking device has a structure shown in Figs. FIG. 2 is a view showing a sectional structure of a magnetic particle type electromagnetic braking device with a shaft, and FIG. 3 is a view showing a sectional structure of a magnetic particle type electromagnetic braking device having a hollow shaft.

In FIG. 2, 1 is an input shaft and 2 is an input shaft key.
3 is a bearing, 4 is an input side bracket, 5 is a mounting screw hole, 6 is a coil, 7 is a yoke, 8 is a coil bobbin, 9 is a terminal block, 10 is a cylinder, 11 is a blocking ring, 12 is a side plate, and 13 is fixed. Rotor, 14 is labyrinth, 15 is seal,
The fixed rotor boss, 17 is a magnetic powder, 18 is a fixed side bracket, and 19 is an air guide hole. In this magnetic particle type electromagnetic braking device with a shaft, a braking load is connected to the input shaft 1 side.

FIG. 3 shows a hollow magnetic particle type electromagnetic braking device, but the same parts as those in FIG. 2 are designated by the same reference numerals.
In this hollow magnetic particle type electromagnetic braking device, the input shaft is not provided, but the shaft hole 21 in which the key groove 20 is formed is provided.

The structure of these magnetic particle type electromagnetic braking devices described above is roughly divided into a stationary part and a rotating part, the stationary part is composed of an electromagnet part (yoke) containing a coil, and the rotating part is a load side cylinder. . The electromagnet portion is concentrically arranged on the outer circumference of the cylinder with a constant magnetic path gap, and is configured to cover the cylinder via a bearing.

When the coil is energized to be in an excited state, the magnetic particles magnetized by the generated magnetic flux are connected in a chain shape along the magnetic path and solidify to couple the rotor and the cylinder by the coupling force to perform braking.

Further, there are various methods of radiating heat generated during braking, such as a natural cooling method and a forced cooling method. The natural cooling method is a method of radiating heat generated in the cylinder and the rotor part to the outside by natural convection and natural conduction, while the forced cooling method is a method of forcibly radiating heat by compressed air, water and the like.

"Problems to be Solved by the Invention" The conventional magnetic particle type electromagnetic braking device described above has the following problems.

That is, (a) this magnetic particle type electromagnetic braking device has different requirements depending on the customer. For example, there is a requirement for a shaft or a hollow shaft.

(B) Since there are designations of the natural cooling method and the forced air cooling method, it is often necessary to manufacture according to the customer's request, resulting in poor production efficiency. .

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a magnetic particle type electromagnetic braking device which can easily meet the requirements of customers and whose structure can be easily changed. .

"Means for Solving the Problems" In the present invention, by exciting an exciting coil, a magnetic path including a coil yoke and a rotating rotor having a hollow shaft hole is formed. In a magnetic particle type electromagnetic braking device in which magnetic particles are magnetized by a magnetic field in a gap portion formed on a part of the rotor surface and the rotating rotor is braked by being fixed to the gap portion, a part of the coil yoke is provided. A force ventilation duct is detachably attached to the input side bracket, and an input side bracket on which the shaft is rotatably attached is detachably attached to a part of the coil yoke, and at the same time the shaft is fixed to the hollow shaft hole of the rotor. A magnetic particle type electromagnetic braking device that can be easily changed to a natural cooling system or a forced cooling system, or a shaft type or a hollow type is possible. Solve the above problems.

[Operation] According to the present invention, the forced cooling duct can be easily attached to and detached from a part of the coil yoke. Further, the input side bracket can also be easily attached and detached by using a part of the coil yoke, and in this case, the shaft body 1 can be simultaneously fixed to the hollow shaft hole of the rotor. For this reason, it is possible to easily change to a natural cooling system or a forced cooling system, or even a magnetic particle type electromagnetic braking device with a shaft or a hollow shaft.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 (a) is a front view showing the configuration of an embodiment of the present invention. The same figure (b) is AA in the above front view (a).
FIG.

In these drawings, reference numeral 1 is a shaft body, and 2 is a rotor base portion which is attached to the peripheral surface 3 on the tip end side of the shaft body 1, for example, by a key. A rotor 4 having a Y-shaped cross section is formed at a substantially central position on the peripheral side surface of the rotor base 2. 5a and 5b are grease-filled type bearings, and space forming board 6a,
6b is rotatably engaged with the rotor base 2.

The space forming plates 6a and 6b are formed in a donut shape, and sealing members 8a and 8b are fitted to the inner peripheral edge end faces 7a and 7b on the center side. The rings 8a, 8b prevent the space in which the rotor 4 rotates from communicating with the external space through the bearings 5a, 5b. When the rotor 4 rotates, the peripheral side surface of the rotor base 2 is prevented. Slides on the inner peripheral surfaces of the seal members 8a and 8b while being in close contact with the inner peripheral surfaces.

Reference numeral 10 is a doughnut-shaped yoke having a rectangular cross section, and a coil 11 is installed inside. The coil 11 is wound in a donut shape like the yoke 10, and when excited, generates a magnetic flux as shown by a broken line.

The yoke 10 is near the outer peripheral edges of the space forming plates 6a and 6b,
It is tightly fixed by screws 12. The inner side surface 10a of the yoke 10 faces the surface 4a of the rotor 4 with a slight gap.

13 is a space in which the rotor 4 rotates, and the space forming plate 6
It is composed of a and 6b and a coil yoke 10.

Reference numeral 14 denotes a forced ventilation duct having a heat dissipation fin 15 formed on the surface thereof, which is formed in a donut shape having an L-shaped cross section, the inner surface of which is formed so as to be fitted to the outer peripheral portion of the yoke, and which is formed in the axial direction. A plurality of blast branches 14a are formed.
The forced air duct 14 is attached to the outer peripheral portion of the yoke in a fitted state.

Reference numeral 16 denotes an air passage, and a female screw portion 17 in which a taper screw is formed is formed in a part of the air passage, and a tip end portion of a blower hose such as a compressor (not shown) is screwed.

Reference numeral 18 is an input side bracket to which the shaft body 1 described first is rotatably attached by a bearing 18a. This input side bracket is formed in a shape as shown in the figure, for example, by aluminum die casting. The side surface portion 18b of the bracket 18 is fixed to the yoke 10 by, for example, a bolt or the like, and the yoke 10 and the bracket 18 can be separated as necessary.

Since the present invention has the configuration as described above, the forced air blowing duct 14 can be easily attached and detached, and if the duct 14 is removed, it becomes a natural cooling system, while if it is installed, it becomes a magnetic particle type electromagnetic braking device of a forced cooling system.

If the input side bracket 18 is removed together with the shaft body 1, a hollow shaft type magnetic particle type electromagnetic braking device is obtained.

[Advantage of Invention] As described above, according to the present invention, based on the magnetic particle type electromagnetic braking device of the natural cooling type and the hollow shaft type, the magnetic particle type electromagnetic braking device of the forced cooling type can be easily Or modified to a magnetic particle type electromagnetic braking device with a shaft,
Specifications can be changed.

[Brief description of drawings]

FIG. 1 (a) is a front view of a magnetic particle type electromagnetic braking device according to an embodiment of the present invention, and FIG. 1 (b) is a sectional view taken along line AA of FIG.
FIG. 2 is a sectional view showing the structure of a conventional magnetic particle type electromagnetic braking device with a shaft, and FIG. 3 is a sectional view showing the structure of a conventional hollow shaft type magnetic particle type electromagnetic braking device. 1 ... Shaft, 2 ... Rotor base, 4 ... Rotor, 6a, 6b
...... Space forming board, 7a, 7b …… Seal O-ring, 10 ……
Yoke, 11 ... Coil, 13 ... Space, 14 ... Forced air duct, 18 ... Input side bracket.

Claims (1)

[Scope of utility model registration request] 1. A magnetic path including a coil yoke and a rotating rotor having a hollow shaft hole is formed by exciting an exciting coil, and the magnetic path is formed in a part of the rotor surface in the magnetic path. In a magnetic particle type electromagnetic braking device in which magnetic particles are magnetized by a magnetic field in a gap portion and the rotating rotor is braked by being fixed to the gap portion, a forced ventilation duct is detachably attached to a part of the coil yoke. At the same time, the input side bracket to which the shaft is rotatably attached can be detachably attached to a part of the coil yoke, and at the same time, the shaft can be fixed to the hollow shaft hole of the rotor. In addition to the natural cooling method or forced cooling method, a magnetic particle type electromagnetic braking device that can be changed to a shaft type or a hollow type.