JPS608530A - Solenoid clutch - Google Patents

Abstract

PURPOSE:To locate a rotary shaft at two stable portions and rotate the shaft at the respective positions by selectively applying a current to a coil to move a movable portion by a reciprocal action between magnetic force generated from the coil and a permanent magnet. CONSTITUTION:In case of applying a current to a coil 8 to move a movable portion to B side, as the surface of the bearing 3 is magnetized to be of N pole by a permanent magnet 2, an exciting current of such a polarity is applied to the coil that A side of the movable portion 7 is N pole and B side is S pole. Thus, the surface of the bearing 5 is magnetized to be of N pole by the permanent magnet 4, so that repulsive force on A side and attraction force on B side are generated by the reciprocal action between the permanent magnets 2, 4, thereby to move the movable portion 7 in direction of an arrow B. On the other hand, a current opposite to the above is applied to move the movable portion 7 in direction of an arrow A. In either case, a rotary shaft can be moved up and down and turned round bearings 3, 5.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention operates in two positions by the action of mutually generated magnetic fields between an electromagnet and a permanent magnet, and when positioned in one or the other, the absorption force of the permanent magnet is reduced. The present invention relates to an electromagnetic clutch with a force suitable for being pulled in more lightly to take a stable two-position position.

[Background of the invention]

Conventional electromagnetic clutches achieve two stable positions by placing the clutch in one position using the force of a spring, then applying an electric current to pull the clutch into the other position.

However, if this is done, the return force of the spring will be added to the load, and the device will not operate unless more power than necessary is applied, so it is not suitable for operation at low voltage.

Moreover, the stability of the two-position position always returns to one side due to the force of the spring when the power is turned off, so it can only be used with continuous current-carrying types, which requires a large power supply, and has the disadvantage that it cannot be miniaturized. was.

Furthermore, there are disadvantages in that the structure is large and the number of parts increases, and troubles such as variation in the performance of the return spring and fatigue occur.

[Purpose of the invention]

The object of the present invention is to flow a current that instantaneously makes the magnetic field held by the attractive force of a permanent magnet on one side zero when current is passed through the coil. We provide an electromagnetic clutch that can take two stable positions by moving it to the other direction and holding it with a permanent magnet to take the other position, and by moving it in the opposite direction when the opposite voltage is applied. It's about doing.

[Summary of the invention]

The present invention has two permanent magnets and a coil part, and the movable part is positioned in a state where it is constantly attracted in one direction by the force of the permanent magnets, and a magnetic field in the opposite direction to the permanent magnet is generated in the coil part. A current is applied to the magnet to separate it from the attracted state, and a magnetic field is generated in the direction of addition to the other permanent magnet, so that the movable part becomes attracted and can take two positions. Next, in order to return to the original position, a magnetic field can be applied to the coil in the opposite direction to the direction in which it was previously applied.

[Embodiments of the invention]

The present invention will be explained in detail below. In FIGS. 1 and 2, reference numeral 1 denotes a case, which has a cylindrical shape. 2 is a permanent magnet and 3 is a bearing. Case 1 is a comparison of permanent magnet 2 in a narrowed form.
is fixed. Here, the case 1 and the bearing 3 are made of magnetic material, and have the effect of transmitting magnetic lines of force. A bobbin 9 has a coil 8 wound thereon, and both ends of the coil 80 are soldered to bobbin terminals 10 and 12. A rotating shaft 6 is made of a non-magnetic material, has a movable part 7 made of a magnetic material press-fitted therein, and is rotatably inserted into the bearing parts 3 and 5.

Reference numeral 11 denotes a fixed plate, on which the permanent magnet 4 is fixed with a bearing 5 in a narrow manner.

When assembling, insert the rotating shaft 6 into the bearing 5 and connect the bearings 3 and 5.
, supports both ends of the rotating shaft 6 so that the rotating shaft 6 can rotate smoothly.

Next, in the diagram shown in FIG. 3, the movable part of the magnetic material 7 to which the rotating shaft 6 is fixed integrally moves in the direction of arrow A and is attracted to the bearing part 6 magnetized by the permanent magnet 2. . Here, the magnets 2 and 4 are magnetized with their north and south poles in the AB force direction, respectively, and when the permanent magnets 2 and 4 are placed with the north pole on the inside in Fig. 1, the permanent magnets are 4 is also inside KN
Make the opposite sides with the same polarity so that the poles are aligned. This assembly is then assembled so that the north pole is located on the inside. In Fig. 3, it is adsorbed on the inside of the bearing 3, that is, on the A side of the movable part 7, and the bearing 30 side is the N pole,
The A side of the movable part 7 is magnetized and attracted to the S pole. Also, since the B side of the movable part 7 is the N pole, the bearing 5 is magnetized to the N pole on the A side surface by the magnetic force of the permanent magnet 4, so they repel each other and the movable part 7 A force in the A direction is added. Next, when you want to move the movable part 7 to the B side by energizing the coil 8, the surface of the bearing 6 is magnetized to the N pole by the permanent magnet 2, so the A side of the movable part 7 is the N pole. When an excitation current with a polarity such that the B side becomes the S pole is passed through the coil, the surface of the bearing 5 becomes the N pole due to the permanent magnet 4, so there is a repulsive force on the A side of the movable part 7, and a repulsive force on the B side. Attractive force is generated by the interaction of the permanent magnets 2 and 4, and when the movable part 7 is strongly pulled in and moved in the B direction and the electricity is turned off, the second part, which is attracted in the B direction by the force of the permanent magnets 2 and 4, It will be in the state shown in Figure 4. Next, in order to change the state from the state shown in FIG. 4 to the state shown in FIG. As described above, the state shown in FIG. 3 can be achieved by the repulsion and attraction forces with the pressure permanent magnet.

The feature of the electromagnetic mechanism that can selectively take these two positions is that at the same time as the rotating shaft 6 moves up and down, the bearings 3 and 5
It is possible to rotate around the center. In other words, it is possible to selectively take two positions and rotate at each position, thereby functioning as a clutch that switches the rotational operation. Moreover, when in the 2nd position, it is possible to maintain the state of being attracted to one side by the action of the permanent magnets 2 and 4, and it is also possible to apply an appropriate braking force proportional to the magnitude of the attraction force. , it is possible to stabilize the rotational operation. In addition, the bearings 6 and 5 are made of magnetic material and form part of the magnetic path of the magnetic field generated by the coil, so they have the effect of lowering the magnetic resistance of the magnetic path, allowing efficient operation with low power consumption. is obtained □ is obtained. However, even if the bearings 3 and 5 are made of non-magnetic material, the same operation is possible and the features of the present invention can be fully utilized.

〔Effect of the invention〕

According to the present invention, it is possible to move to two positions by instantaneously applying current, and since the rotating shaft can be rotated in each of the two positions, it can be used as a clutch, and it can be operated with low power consumption. It is possible to operate with In addition, it is possible to control the force of movement by flowing a strong current, and by continuing to flow the current without cutting off, the attraction force can be controlled.

Moreover, since it uses the magnetic field of a permanent magnet, it can be designed compactly, which has great industrial value in that it can be used in industrial products and consumer devices that are becoming smaller and lighter.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of an electromagnetic clutch according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a cross-sectional side view when the rotating shaft is attracted in direction A, and FIG. The figure is a cross-sectional side view when the rotating shaft is attracted in direction B. 1・・・・・・・・・・・・・・・・・・Case 2.4
・・・・・・・・・Permanent magnet 3.5・・・・・・
...Bearing 6 ...Rotating shaft 7 ...
・・・・・・・・・・・・・・・Movable part＼ 8・・・・・・・・・・・・・・・・・・Coil 9...
・・・・・・・・・・・・・・・Bobbin 10.12・
・・・・・・・・・Terminal 11・・・・・・・・・・・・Fixed plate demon 1 Figure 3 Figure 3 I 4 Figure procedure amendment (voluntary) 1+lu 541θ,, ? . Person/Group making the amendment and Section 1 Patent applicant name 4510) All shares of the company (and others) Target of amendment Column for detailed explanation of the invention in the specification, column for brief explanation of the drawings, and Drawings 1 to 4. Contents of amendment 1: "Absorption" in the first negative line 18 of the specification is corrected to "suction". 2. Delete "subject" from line 7 on page 4 of the specification. 6. "Next..." on page 5, lines 6 to 4 of the specification.
...Assembling. ” to be deleted. 4. "Movable part J" on page 8, line 9 of the specification is corrected to "movable part." 5. Figures 1 to 4 of the drawings are corrected as shown in the attached sheet. Above, Figure v51 Figure 3 J Figure 64

Claims (1)

[Claims] 1. A rotating shaft that has two permanent magnets that are spaced apart and facing each other, and a movable part that can freely slide between the two permanent magnets and that can be attracted to either one of the permanent magnets. and,
In order to move the movable part, a coil wound around a bobbin is provided, and by selectively applying a busy current to the coil, the movable part is moved and rotated by the interaction between the magnetic force generated from the coil and the permanent magnet. Electromagnetic clutch 0 characterized in that the shaft can be rotated around the bearing