JPS6222665Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a magnetic particle type torque limiter that allows the torque setting value to be freely adjusted.

Magnetic particles interposed between the input-side rotating member and the output-side rotating member are magnetized to couple both rotating members, thereby transmitting torque between these rotating members, while the coupling force is greater than this coupling force. Torque limiters have been put into practical use that cause slippage when the load exceeds and interrupt torque transmission.

This type of torque limiter is used, for example, as a device that feeds an object by a fixed distance until it hits a stopper,
Although it is extremely effective when used in a transmission device that can automatically cancel torque transmission when the load exceeds a certain value, it has a drawback in that the limit value of the transmitted torque cannot be adjusted.

Based on the above-mentioned viewpoint, this invention provides a magnetic particle type torque limiter that allows the limit value of the transmitted torque to be freely adjusted within a certain range. a pair of outer rotating members, each of which is disposed opposite to each other with a small gap from both end surfaces of the disk, and each of which is coaxially supported by the inner rotating member so as to freely rotate; a non-magnetic ring that is integrally fixed to the pair of outer rotating members with a small gap between the outer circumferential surface of the disk; and a non-magnetic ring that is arranged concentrically outside of the non-magnetic ring and the pair of outer rotating members. The pair of outer rotating members is configured such that the opposing gap between an annular permanent magnet fitted between the two and a flange protruding from the outer peripheral surface of the annular permanent magnet and formed on one of the pair of outer rotating members is freely adjustable. and an annular adjustment member which is arranged concentrically on the outside of the annular permanent magnet and is fitted to the other outer rotating member so as to be freely adjustable in position in the axial direction; It is characterized in that it has magnetic particles inserted into the small gap maintained between the non-magnetic ring and the non-magnetic ring.

Next, the torque limiter of this invention will be explained by way of examples with reference to the drawings.

The drawing shows an embodiment of the torque limiter of this invention in a side view of the upper half of the torque limiter. As shown in the drawings, the inner rotary member A, which is shaped like a tubular shaft and is keyed to the shaft 1 of the device, is made of a non-magnetic material, and the base 2A of the disk 2 is formed at a predetermined position in the middle in the axial direction.

The disk 2 is a disk body 2B made of a magnetic material that is integrally fixed to the outer periphery of the base 2A by shrink fitting or the like.
has.

In this embodiment, the disk 2 is formed into an inner and outer annular two-layer structure in which only a predetermined width portion near the outer peripheral surface is the disk body 2B made of magnetic material. However, when the inner rotating member A is made of magnetic material, it is natural that It has a one-layer structure.

On the other hand, a pair of outer rotating members B and C, which have inner end surfaces 3 and 4 facing each other with a small gap between them and the disk 2, are freely rotatable on the inner rotating member A via bearings 5 and 5, respectively. is supported concentrically.

Further, a non-magnetic ring 6 is fitted and fixed across the stepped portions 7 and 8 of the pair of outer rotating members B and C, with a small gap being maintained between the non-magnetic ring 6 and the outer circumferential surface of the disk 2.

An annular permanent magnet 9 concentrically arranged outside the non-magnetic ring 6 is fitted and fixed between the opposing end surfaces of the outer rotating members B and C, and the permanent magnet 9 and the non-magnetic ring 6 are also fixed together.

The outer rotating member B has an outer diameter slightly larger than the outer diameter of the permanent magnet 9, and the outer periphery is formed into a male thread 10.

A female thread 12 on the inner peripheral surface of an annular adjustment member 11 arranged concentrically outside the permanent magnet 9 is screwed into the male thread 10 .

The adjustment member 11 is displaced in the axial direction by rotating along the screws 10 and 12 to adjust the facing gap g between the outer rotating member C and the flange 13, and is adjusted to the adjustment position by tightening the set bolt 14. Fixed.

A required amount of magnetic particles 15 are inserted between the disk 2 of the inner rotating member A, the outer rotating members B and C, and the non-magnetic ring 6.
is magnetized in the line of magnetic force _Φ1 extending from the permanent magnet 9 to the outer rotating members B, C and the disk body 2B, and integrally connects the disk 2 and the outer rotating members B, C.

On the other hand, a line of magnetic force _Φ2 also passes from the permanent magnet 9 to the outer rotating members B, C and the adjusting member 11, and the magnetic flux density of the line of magnetic force _φ2 changes depending on the change in the facing gap g between the adjusting member 11 and the flange 13. increase or decrease.

In addition, in the figure, the reference numeral 16 indicates a sealing member such as a mechanical seal.

Since the torque limiter of this invention has the above-described structure, the magnetic particles 15 in the line of magnetic force _φ1 are magnetized to integrally connect the disk 2 and the outer rotating members B and C.

Now, when torque is transmitted using the outer rotating members B and C as the input side (or output side) and the inner rotating member A as the output side (or input side), the torque will be transmitted as long as the load does not exceed the binding force due to the magnetic particles 15. The condition is maintained.

When the load exceeds the coupling force, a slip occurs between the disk 2, the magnetic particles 15, and the outer rotating members B and C, and torque transmission is instantly interrupted.

Next, when the set bolt 14 is loosened and the adjusting member 11 is rotated relative to the outer rotating member B, the adjusting member 11 moves to a position where the facing gap g with the outer rotating member C changes, and the line of magnetic force Φ ₂ is affected. .

Since the total amount of the magnetic line of force Φ ₂ and the magnetic line of force Φ ₁ is constant, a change in the line of magnetic force Φ ₂ causes a change in the line of magnetic force Φ ₁ , which changes the binding force of the magnetic particles 15 and changes the torque setting value.

After adjusting the torque setting value, tighten the set bolt 14 again.

As is clear from the above explanation, the torque limiter of this invention is a disk-type magnetic particle type torque limiter, but the torque setting value can be arbitrarily changed by extremely simple operation, and the structure and operation are extremely simple and durable. It has excellent advantages such as being rich in properties.

[Brief explanation of the drawing]

The drawing shows an example of the torque limiter of this invention.
FIG. 3 is a side view showing the upper half in a longitudinal section. In the drawings, A... Inner rotating member, B, C... Outer rotating member, 2... Disk, 2B... Disk body, 6
...Nonmagnetic ring, 9...Permanent magnet, 10...Male thread, 11...Adjustment member, 12...Female thread, 13
...Flange, 14...Set bolt, 15...
Magnetic particles, g... opposing gap, Φ ₁ , Φ ₂ ... lines of magnetic force.

Claims (1)

[Scope of utility model registration request] a shaft-shaped inner rotating member having a disk made of a magnetic material at a predetermined position in the axially intermediate portion thereof; and a shaft-shaped inner rotating member that is disposed opposite to both end faces of the disk with a small gap therebetween, and is freely rotatable on the inner rotating member. A non-magnetic ring is integrally fixed to the pair of outer rotating members with a small gap maintained between the pair of outer rotating members supported concentrically by the disk and the outer peripheral surface of the disk; an annular permanent magnet arranged concentrically on the outside and fitted between the pair of outer rotating members; and a flange protruding from the outer peripheral surface of the annular permanent magnet and formed on one of the pair of outer rotating members. An annular adjusting member that is freely adjustable in the facing gap and is disposed concentrically on the other of the pair of outer rotating members and on the outside of the annular permanent magnet, and is fitted into the other outer rotating member so that the position can be freely adjusted in the axial direction. and magnetic particles inserted into the small gap maintained between the disk, the pair of outer rotating members, and the non-magnetic ring.