JPS6210491Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement of a magnetic particle type coupling device having a rotor formed in the form of a disc.

Generally, this type of device has a simple structure, is small in size, and is inexpensive, so it is used in servo mechanisms and tension control mechanisms that are simpler than conventional ones.

This invention provides a magnetic particle type coupling device that is smaller, cheaper, and has better torque stability than conventional devices.

Hereinafter, an embodiment of this invention shown in the drawings will be explained in detail.

In the figure, 1 is a main shaft constituting a shaft body that transmits torque to a load (not shown), 2 is a rotor formed in a disk shape, and the main shaft 1 and rotor 2 are made of non-magnetic material such as stainless steel wire for welding. Using filler metal 3,
Fixed by welding. Reference numeral 4 denotes a stator constituting a second connecting body, which has surfaces facing each other in the axial direction of the rotor 2 through gaps 5 and 6, and 7 and 8 are attached to the stator and allow the main shaft 1 to rotate freely. A supporting bearing, 9 is a coil built into the stator 4, 10 is a non-magnetic ring fixed to the inner peripheral surface of the coil 9 to break the magnetic shield, 11 is filled in the gaps 5 and 6. These magnetic particles are prevented from flowing out to the outside by seal lips 12 and 13 arranged inside the stator 4. In the magnetic particle coupling device configured as described above, when the coil 9 is excited, a magnetic flux Φ is generated in the magnetic path shown by the dotted line in the figure, and the magnetic particles 11 filled in the gaps 5 and 6 are magnetized by this magnetic flux. Braking force is generated by the shearing resistance between the magnetic particles and the frictional force between these magnetic particles and the surrounding rotor 2 and stator 4, and the rotor 2 and the main shaft 1
The braking torque is transmitted to a load (not shown) via the brake.

By the way, in conventional devices of this type, the main shaft 1
Various types of fastening such as brazing, bolting, and welding using magnetic filler materials such as coated arc welding rods for mild steel are used to connect the rotor 2 and the rotor 2, but each of these methods has drawbacks as described below. many. In other words, the brazing method has high running costs, has many constraints on the production shape such as the number of manufacturing lots and manufacturing time because of batch processing, and also has large distortions due to the high temperature of the material, requiring post-processing. do. Further, methods using various types of fastening such as bolts have a complicated shape and require a large space, making the entire device large and expensive. Furthermore, in a method of welding using a magnetic filler material such as a coated arc welding rod for mild steel, the residual magnetism of the molten metal causes the magnetic particles 11 to
A large amount of adhesion adheres to this part, and the torque value becomes unstable depending on the amount of adhesion. Moreover, when the amount of adhesion increases, the adhering magnetic particles form a bridge in the space X between the molten metal and the stator 4, causing magnetic leakage, and as a result, the torque value becomes unstable.

On the other hand, according to the embodiment of this invention, the rotor 2 is welded to the main shaft 1 using a non-magnetic filler material 3 such as a stainless steel wire for welding.
Welding of the rotor 2 to the main shaft 1 can be performed using simple and inexpensive equipment, and since the processing time is short, there are almost no constraints on the production shape, and depending on the welding conditions and part precision settings, no post-processing is required. ,
The space required for bonding is small, and the residual magnetism of the molten metal allows the magnetically bonded particles 1 to
Torque stability is good because 1 hardly sticks.

As described above, this invention is a magnetic particle type coupling device having a disk-shaped rotor, in which the rotor is welded to the shaft using a non-magnetic filler material, so it is small and inexpensive. This allows you to obtain a device with good torque stability.

[Brief explanation of the drawing]

The figure is a sectional view showing an embodiment of this invention.
In the figure, 1 is a main shaft, 2 is a rotor, 3 is a non-magnetic filler material, 4 is a stator, 9 is a coil, 10 is a non-magnetic ring, and 11 is a magnetic particle.

Claims (1)

[Claims for Utility Model Registration] (1) A first connecting body having a disc-shaped rotor rotatably attached to a shaft, and a second connecting body provided with a predetermined gap between the rotor and the rotor. , comprising magnetic particles filled in the gap, and a device capable of magnetizing the magnetic particles to control the connection state between the respective connection bodies, and using a non-magnetic filler material to connect the rotor to the shaft body. A magnetic particle type connecting device characterized by welding. (2) A magnetic particle type coupling device according to claim 1, characterized in that a stainless steel wire for welding is used as a non-magnetic filler material.