JPH0527705Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic particle coupling device suitable for application to torque limiters and load brakes.

[Conventional technology]

BACKGROUND ART Magnetic particle coupling devices of this type have been used as load brakes and torque limiters in various machines and devices such as machine tools and copying machines. When used as a load brake, the magnetic particles interposed between the rotating member and the braking member are magnetized to connect these two members together, and the rotating member is rotated by power transmission that exceeds this bonding force. let me,
When the power is cut off, the rotating member is immediately stopped by the action of the coupling force to prevent rotation due to inertia, that is, overrun. When used in a copying machine, etc., it can be used in a highly accurate stopping position of a paper feed mechanism, etc. Used for control. When used as a torque limiter, the input side rotating member and the output side rotating member are integrally coupled by magnetizing magnetic particles, and while torque is transmitted between these two members, the load exceeds this coupling force. By temporarily interrupting torque transmission when a slip occurs, it prevents damage to the machine due to overload and ensures worker safety. One example is the magnetic particle type torque limiter shown in Publication No. 62-22665. It has been known. This torque limiter has a pair of outer rotating members facing each other with a slight gap between them on both end faces of a disc-shaped disk, which are arranged so as to freely rotate with respect to the inner rotating member, and facing each other with a slight gap around the outer periphery of the disk. A cylindrical non-magnetic ring is arranged and integrally fixed to the pair of outer rotating members, and a magnetic ring is provided in the gap formed between the disk, the pair of outer rotating members and the non-magnetic ring. interposing particles, integrally providing one of the pair of outer rotating members with a flange portion protruding from the outer periphery of the annular permanent magnet, and moving the annular adjusting member in the axial direction between the other outer rotating member and the outer periphery of the permanent magnet. By providing a freely adjustable adjustment member and variably setting the gap between the adjustment member and the flange portion, the binding force due to the magnetic particles, in other words, the torque setting value can be arbitrarily changed.

[The problem that the idea aims to solve]

However, in the conventional torque limiter described above, a disk-shaped gap is provided between both end surfaces of the disk and the pair of outer rotating members, and magnetic particles are interposed in this gap. The radial dimension of the device itself becomes large, making it difficult to downsize the device.

Therefore, it is an object of the present invention to solve the above-mentioned problems and provide a torque-adjustable magnetic particle coupling device that has a simple configuration and can be made smaller in diameter. .

[Means to solve the problem]

In order to achieve the above object, the present invention includes a disk made of a magnetic material which is formed into a cylindrical shape and is fitted and fixed to a rotating shaft, and the disk is attached to the rotating shaft so as to face each other with a small gap on both sides of the disk. A pair of support members disposed to freely rotate, and a plurality of torque adjusting convex portions (or concave portions) formed in a cylindrical shape and provided on the outer circumferential surface of both ends in the axial direction so as to be equally distributed in the circumferential direction. The space between these torque adjusting protrusions (or concave parts) is a magnetic isolation part, and the discs are arranged concentrically with a slight gap on the outside of the disk, and both end surfaces are on the inner surfaces of the pair of support members, respectively. A fixed adjustment ring, and a plurality of torque adjustment recesses (or protrusions) are formed on the inner circumferential surface of the adjustment ring in correspondence with the torque adjustment protrusions (or recesses) of the adjustment ring, and a plurality of torque adjustment recesses (or protrusions) are formed on the outside of the adjustment ring. a pair of disc-shaped yokes that are arranged concentrically to face each other between the pair of support members and are slidable along the inner surface of the support member; an annular permanent magnet magnetized in the axial direction facing the outside of the magnetization section of the adjustment ring;
It is constructed of magnetic particles interposed in a cylindrical gap provided between the outer circumferential surface of the disk and the inner circumferential surface of the adjustment ring.

[Effect]

In the present invention, both the disk and the adjustment ring provided outside the disk are cylindrical, so the gap between them is cylindrical and has a smaller diameter than a disk-shaped gap. .

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Figure 1 is a side view of the upper half of an embodiment in which the present invention is applied to a load brake;
The figure is a half-sectional view showing the relationship between the adjustment ring and the disc-shaped yoke. In these figures, reference numeral 1 denotes a rotating shaft installed in a device or device, and a cylindrical disk 2 made of magnetic material is fitted onto this rotating shaft 1, and a disk 2 made of a magnetic material is fitted with a shrink fit, a key, etc. They are fixed together by means of. Further, a pair of support members 3 and 4 are disposed on the rotating shaft 1 so as to freely rotate through a pair ring 5 and a seal ring 6, the inner surfaces of which face the opposite sides of the disk 2 with a slight gap between them. There is.

On the outer periphery of the pair of support members 3 and 4, a pair of disc-shaped side plates 7 and 8 facing each other are provided.
The inner circumferential edges thereof are arranged so as to fit into stepped portions 9 and 10 provided on the outer circumferential surfaces of the support members 3 and 4, respectively, and one of them, for example, 8 is fixed to a device fixing portion. Further, between the pair of side plates 7 and 8, a cylindrical adjustment ring 12 whose both ends are fixed to the inner surface of each side plate 7 and 8 by set screws 11 is disposed concentrically with the disk 2. has been done. On the outer circumferential surface of both ends of the adjustment ring 12 in the axial direction, a plurality of torque adjusting protrusions 13 having a required length in the circumferential direction are integrally and equally distributed in the circumferential direction. The wall thickness between the protrusions 13 is thin, and the adjustment ring 12 is configured as a magnetically disconnected portion so that the magnetic circuit of a permanent magnet 19, which will be described later, is not short-circuited. A small cylindrical gap A is set between the inner circumferential surface and the outer circumferential surface of the disk 2, and a required amount of magnetic particles 14 are interposed in the gap A. Further, between the pair of side plates 7 and 8, and on the outside of the adjustment ring 12, there is a pair of disk-shaped yokes 15 and 1 facing each other.
6 is arranged concentrically with the adjustment ring 12,
The outer surfaces of these yokes 15 and 16 are supported by O-rings 17 provided on the inner surfaces of each of the side plates 7 and 8, and are rotatable relative to the plates 7 and 8. In addition, a pair of disc-shaped yokes 15,
16 is fixed to the inner circumferential surface of a cylindrical yoke 18 that is commonly fitted to the outer circumferential surface of the yoke 16, and is integrally coupled via the cylindrical yoke 18. Furthermore, between the yokes 15 and 16, the An annular permanent magnet 19 is fitted and fixed concentrically to the outer side of the magnetically interrupted portion of the adjustment ring 12. Then, each disc-shaped yoke 1
A plurality of torque adjustment concave portions 20 having a required length in the circumferential direction and equally distributed in the circumferential direction are provided on the inner circumferential surfaces of the adjustment rings 12 and 16.
It is recessed corresponding to 3.

In the load brake configured as described above, the magnetic particles 14 are magnetized in the line of magnetic force φ that passes from the annular permanent magnet 19 through the pair of disc-shaped yokes 15 and 16, the adjustment ring 12, and the disc 2, and thereby become magnetized. 2. The adjustment ring 12 and the pair of disc-shaped yokes 15 and 16 are integrally coupled. Therefore, when the rotating shaft 1 receives a torque transmission that exceeds the binding force by the magnetic particles 14, a slip occurs between the disk 2, the magnetic particles 14, and the adjustment ring 12, and the rotating shaft 1 rotates. When the driving force is cut off, the rotating shaft 1 tries to rotate due to inertial force, but the coupling force is greater than this inertial force, so a brake is applied to stop the rotating shaft 1 instantly. Therefore, overrun can be prevented.

When adjusting the torque setting value of the load brake, rotate the cylindrical yoke 18 by hand, and rotate the torque adjustment convex portion 13 of the adjustment ring 12 and the disc-shaped yoke 1.
The relative positional relationship of the torque adjusting recesses 20 5 and 16 may be shifted. Then, the convex portion 13 and the concave portion 2
0, the cross-sectional area of the magnetic flux path formed between the adjustment ring 12 and the disc-shaped yokes 15 and 16 changes, resulting in a change in the coupling force due to the magnetic particles 14, which changes the torque setting. The value can be set to a desired value.

In addition, although the above-mentioned embodiment explained the case where it is used as a load brake, the present invention is not limited to this and can be used as a torque limiter.

Further, in the above embodiment, the adjustment ring 12 is provided with the torque adjustment convex portion 13, and the disc-shaped yokes 15 and 16 are provided with the torque adjustment recesses 20, but the reverse may be used. Further, although the supporting members 3 and 4 are made to have separate structures having the side plates 7 and 8, they may be formed into an integral structure.

[Effect of idea]

As described above, the magnetic particle type coupling device according to the present invention has a cylindrical disk and an adjustment ring disposed outside the disk, so that the slight gap between these two members can be reduced to a cylindrical shape. Since the magnetic particles are interposed in the gap, the diameter can be made smaller compared to the case where a disc-shaped gap is provided, and the device can be made more compact. In addition, an annular permanent magnet magnetized in the axial direction is sandwiched between a pair of disc-shaped yokes, and these yokes and permanent magnets are arranged so as to be able to slide along the inner surfaces of a pair of support members, so that the torque setting value can be adjusted. Adjustment can be made easily and the device can be provided at low cost.

[Brief explanation of the drawing]

Figure 1 is a side view of the upper half of an embodiment in which the present invention is applied to a load brake;
The figure is a half-sectional view showing the relationship between the adjustment ring and the disc-shaped yoke. DESCRIPTION OF SYMBOLS 1...Rotating shaft, 2...Disc, 3, 4...Support member, 7, 8...Side plate, 12...Adjustment ring, 13...Torque adjustment protrusion, 14...
Magnetic particles, 15, 16... Disc-shaped yoke, 18...
...Cylindrical yoke, 19...Annular permanent magnet, 20...
...Torque adjustment recess, A...Gap.

Claims (1)

[Scope of utility model registration request] A disk made of a magnetic material formed into a cylindrical shape and fitted and fixed to a rotating shaft, and a pair of supports disposed on both sides of the disk so as to be freely rotatable on the rotating shaft so as to face each other with a slight gap. a member, and a plurality of torque adjusting convex portions (or concave portions) formed in a cylindrical shape and provided on the outer circumferential surface of both ends in the axial direction at equal intervals in the circumferential direction, and these torque adjusting convex portions. (or recessed part) as a magnetic disconnection part,
An adjustment ring is arranged concentrically with a slight gap on the outside of the disk and has both end surfaces fixed to the inner surfaces of the pair of support members, and a plurality of torque adjustment recesses (or protrusions) are provided on the inner peripheral surfaces of each ring. ) is formed corresponding to the torque adjustment convex part (or concave part) of the adjustment ring, is arranged concentrically between the pair of support members on the outside of the adjustment ring, and is arranged along the inner surface of the support member. a pair of disc-shaped yokes that are slidable together; an annular permanent magnet that is interposed between the pair of disc-shaped yokes and is magnetized in an axial direction that faces the outside of the magnetism-interrupting portion of the adjustment ring; A magnetic particle type coupling device comprising magnetic particles interposed in a cylindrical gap provided between the outer peripheral surface of the disk and the inner peripheral surface of the adjustment ring.