JPS6334470Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a cylinder type hysteresis coupling, and relates to a hysteresis coupling that allows easy adjustment of transmission torque.

Magnetic couplings can transmit rotational force without mechanical coupling or apply braking force without contact. Among these, hysteresis couplings are
Characterized by constant torque characteristics, it is widely used in torque limiters, tachometers, clutches, brakes, etc.

A typical cylinder-type hysteresis coupling (hereinafter referred to as hysteresis coupling) among hysteresis couplings will be explained based on FIG. On the other hand, a shaft 4 made of a magnetic material is fitted into the center hole of a cylindrical permanent magnet 3 having a plurality of magnetic poles magnetized on its outer peripheral surface.
A permanent magnet 3 is disposed inside the hysteresis material 2 through a predetermined gap with respect to the inner circumferential surface, and the cylinder case 1 and shaft 4 are connected and fixed to a shaft support or a transmitted device so as to be relatively rotatable. .

In this configuration, for example, when the shaft 4 is rotated by external power, the hysteresis material 2 is magnetized by the rotating magnetic field generated by the permanent magnet 3, and torque is transmitted to the cylinder case 1 due to the magnetic interaction between the two, and the torque is transmitted in the same direction. Rotate to. Further, although FIG. 1 shows a case where the hysteresis material rotor is on the outside and the permanent magnet rotor is on the inside, the same effect can be obtained even if the permanent magnet rotor is on the outside.

Generally, the transmission torque of a hysteresis coupling is determined by the magnetic properties of the permanent magnet, the volume of the hysteresis material, the hysteresis area, etc.
Due to variations in the characteristics, shapes, dimensions, and gaps of the permanent magnets and hysteresis materials, there is inevitably a certain range in the transmitted torque value of each hysteresis coupling. Therefore, if the permissible range of transmitted torque is narrow, it is necessary to adjust the transmitted torque, but conventionally,
Because the transmission torque was adjusted by adjusting the demagnetization of the permanent magnet, there were variations in the magnetic properties of the permanent magnet, and careful work was required to adjust the magnetic force.
This has caused various problems such as a large amount of time being required.

In view of the current situation, this invention aims to provide a hysteresis coupling that allows for easy adjustment of transmission torque.

That is, this invention is a cylinder-type hysteresis coupling in which either a hysteresis material or a permanent magnet is fixed to the inner peripheral surface of the cylinder case and the outer periphery of the shaft, and the hysteresis material and the permanent magnet are arranged through a gap so that they can rotate freely relative to each other. In,
A hysteresis coupling characterized in that it has a yoke plate attached to at least one end surface of a permanent magnet or opposed to it via a gap.

According to this invention, in a hysteresis coupling, the transmitted torque can be adjusted by attaching a yoke plate to at least one end surface of a permanent magnet or by arranging the yoke plate to face each other via a gap. Therefore, by changing the type of adjustment yoke plate and its arrangement, the transmission torque can be easily adjusted, and the transmission torque values of hysteresis couplings having the same specifications can be aligned within an extremely narrow tolerance range.

In other words, the conventional method of adjusting permanent magnets by demagnetizing them is difficult because once rare earth permanent magnets such as samarium cobalt are demagnetized, it is extremely difficult to re-magnetize them. If it is too long, readjustment becomes virtually impossible, but with the yoke plate of this invention, it is possible to select a variety of yoke plates for adjustment, change the position of the yoke plate, or replace them. It is extremely effective in industrial production of hysteresis couplings because it can be adjusted with just a few simple steps.

In addition, as detailed in the explanation of conventional hysteresis couplings, there are two types of couplings whose configurations are mutually reversed depending on whether the permanent magnets and hysteresis material are located on the inside or outside of each rotor. However, regardless of the configuration, the effect is the same, and the effect of the yoke plate according to this invention is also the same. The following explanation of this invention is also representative of the case where the permanent magnet rotor is on the inside, but it goes without saying that the same effects can be obtained even if the permanent magnets and hysteresis material are arranged in the opposite direction. .

In addition, depending on the arrangement of the permanent magnets and hysteresis material, magnetic or non-magnetic materials are selected as appropriate for the cylinder case and shaft, but there are no problems when installing the yoke plate of this invention, and the obtained effects are the same. be.

This invention will be explained below based on the drawings.
Figures 2 and 3 are longitudinal cross-sectional views of the hysteresis coupling according to this invention. Figure 2 shows a case where one side of the non-magnetic cylinder case is open, and Figure 3 shows a case where one side of the non-magnetic cylinder case is open. It is. In both cases, the permanent magnet rotor is placed on the inside, and the shapes and positions of the yoke plates placed above and below the center line are changed.

The hysteresis coupling shown in FIG. 2 has a ring-shaped hysteresis material 2 fixed to the inner circumferential surface of a cylinder case 1 made of a non-magnetic material with one side open.
On the other hand, a shaft 4 made of a magnetic material is fitted into the center hole of a cylindrical permanent magnet 3 having a plurality of magnetic poles magnetized on its outer circumferential surface, and is connected to the inner circumferential surface of the hysteresis material 2 through a predetermined gap. A permanent magnet 3 is disposed inside a hysteresis material 2, and a cylinder case 1 and a shaft 4 are connected and fixed to a shaft support or a transmitted device so as to be relatively rotatable.

The yoke plate 5 shown in the upper half of FIG.
The permanent magnet 3 is attached to the outer end surface of the permanent magnet 3.
Shaft 4 with the same shape as the end face and the specified thickness.
It is a donut-shaped iron piece with a hole, and the outer periphery is located on the end face of the hysteresis material 2 having the same length as the permanent magnet 3.
The thickness of the yoke plate 5 is made thinner than that of the mounting part and extends in the radial direction. Transmission torque can be adjusted. In addition, only the inner end surface of the permanent magnet,
Alternatively, yoke plates may be attached to both end faces.

Furthermore, the yoke plate 6 shown in the lower half of FIG. Hysteresis material 12 from the end face of permanent magnet 3 when it is longer than permanent magnet 3
The thickness of the extending portion of the yoke plate 6 is reduced by the amount of the protrusion.

The hysteresis coupling shown in Fig. 3 is made of a non-magnetic material, has both ends closed, and is 1/2 inch from the end of the body.
A ring-shaped hysteresis material 11 is fixed to the substantially central inner peripheral surface of the cylinder case 10, which can be divided into three parts by fitting together, and a bearing 12 is fixed to the center of the inner wall surface of both ends of the cylinder case 10. A cylindrical permanent magnet 14 with a plurality of magnetic poles magnetized on the outer circumferential surface is fitted onto the outer circumference of a magnetic shaft 13 whose both ends are pivotally supported, and a predetermined gap is formed with respect to the inner circumferential surface of the hysteresis material 11. Through the permanent magnet 1
4 is housed in a hysteresis material 11, and the cylinder case 10 and the magnetic shaft 13 are connected and fixed to a shaft support or a transmitted device so as to be relatively rotatable.

The yoke plate 15 shown in the upper half of FIG. 3 is a donut-shaped iron piece with a diameter larger than the end face of the permanent magnet 14 so as to face the right end face in the drawing of the permanent magnet 14 and hysteresis material 11 of the same length.
A predetermined gap is maintained between the end face of the yoke plate 15 and the hysteresis member 11, and the yoke plate 11 is attached around the shaft 13. For example, the thickness and diameter of the yoke plate 15 can be changed,
Transmission torque can be adjusted by changing the gap to the opposing end faces. In addition, the permanent magnet 14
It may be provided only on the left end face or on both end faces.

Further, the yoke plate 16 shown in the lower half of FIG.
A case is shown in which the hysteresis material 11 is attached around the shaft 13 in the same configuration as the above example, and the length of the hysteresis material 11 is shorter than that of the permanent magnet 14.

By the way, in the case where the rotor of the hysteresis material 11 shown in the upper half of FIG.
An isotropic hysteresis material with dimensions of 16 mmφ x 13 mmφ x 15 mm is used for the hysteresis material 11, and the permanent magnet 1
On the outer end face of 4, look towards the end face of hysteresis material 11.
When a donut-shaped iron piece of 15 mmφ x 8 mmφ was fitted to the shaft 13 with different thickness and gap, the thickness was 1.0 mm, compared to when the yoke plate was not attached.
3.6% when gap is 1.0mm, thickness is 1.5mm, gap
At 0.5mm, it was possible to reduce the transmitted torque by 9%.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a conventional hysteresis coupling, and Figs. 2 and 3 are longitudinal cross-sectional views of a hysteresis coupling according to this invention. FIG. 3 shows the case of a closed cylinder case. In both cases, the permanent magnet rotor is placed on the inside, and the shapes and positions of the yoke plates placed above and below the center line are changed. 1, 10... Cylinder case, 2, 11... Hysteresis material, 3, 14... Permanent magnet, 4, 13
... Shaft, 5, 6, 15, 16 ... Yoke plate, 12 ... Bearing.

Claims (1)

[Scope of utility model registration request] Either a hysteresis material or a permanent magnet is fixed to the inner circumference of the cylinder case and the outer circumference of the shaft.
A cylinder-type hysteresis coupling in which a hysteresis material and a permanent magnet are arranged relatively rotatably through a gap, characterized by having a yoke plate attached to at least one end surface of the permanent magnet or facing each other through a gap. Hysteresis coupling.