JPH04108384U - magnetic joints - Google Patents

Abstract

(57) [Summary] [Purpose] To enable transmission of rotational force and axial driving force. [Structure] A shaft-shaped joint member (2) is coaxially inserted into the center of a hollow joint member (1) so that it can rotate relatively, and these two joint members (1) and (2) are placed facing each other. Permanent magnets (4a)(4b)(4c)(5a)(6a)(6b)(6c)(7c)(8a)(8b)(8
c) Multiple sets of permanent magnet devices consisting of (8d) (3a)(3b)(3c)(3d)
will be established. The permanent magnets of each set of permanent magnet devices are arranged such that four magnetic poles of the same polarity spaced apart in the axial and circumferential directions are located on the opposing circumferential surface of one joint member, and four magnetic poles of the same polarity are located on the opposing circumferential surface of the other joint member. The four magnetic poles are arranged so that magnetic poles having the same polarity as these are located between the four magnetic poles.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a magnetic coupling.

0002

[Conventional technology]

As a magnetic joint, a shaft-shaped joint member rotates relative to the center of a hollow joint member. The two joint members are inserted coaxially so that they face each other on the opposing circumferential surfaces of these two joint members. There are multiple sets of permanent magnet devices each consisting of permanent magnets. It is known that the rotational force is transmitted by the attractive force of a permanent magnet.

0003

[Problem that the idea aims to solve]

However, with conventional magnetic couplings like the ones mentioned above, rotational force can be transmitted, but the axial It was difficult to transmit the directional driving force.

0004 In addition, conventional magnetic joints are of the attraction type, which transmits rotational force using the attraction force of permanent magnets. Because it is a bearing, unbalanced stiffness occurs in the radial direction, and the bearing that rotationally supports the joint member The load applied to the magnetic bearing is large, and when used for driving force transmission for magnetic bearings, It was necessary to increase the rigidity of the

[0005] The purpose of this invention is to solve the above problems and to transmit rotational force and axial driving force. Our goal is to provide magnetic couplings that can reach

[0006]

[Means to solve the problem]

The magnetic joint based on this idea is The shaft-shaped joint member is coaxial with the center of the hollow joint member so that it can rotate relative to the center of the hollow joint member. The permanent magnets are inserted into the opposing circumferential surfaces of these two joint members. In a magnetic joint equipped with multiple sets of permanent magnet devices, The permanent magnets of each set of permanent magnet devices are axially and Four magnetic poles of the same polarity spaced apart in the circumferential direction are located on the opposite circumference of the other joint member. Arranged so that magnetic poles of the same polarity as these four magnetic poles are located between the four magnetic poles on the surface. It is characterized by the fact that

[0007]

[Effect]

In each set of permanent magnet devices, the four magnetic poles of the same polarity on one joint member The magnetic poles of the same polarity of the other joint member located between these receive a repulsive force, and the four magnetic poles held in the middle of the poles. And, due to the holding force due to such magnetic repulsion, In addition to the rotational force, axial driving force is also transmitted between the two joint members.

[0008] Because this is due to the repulsive force, there are two joints in each permanent magnet device. As the materials approach, the repulsive force that pulls them apart increases, causing the two joint members to separate. When the two are separated, the repulsive force that pulls them apart becomes smaller. In other words, the two joint members A holding force that holds them coaxially acts between them, so that unbalanced rigidity does not occur. So As a result, a holding force acts between the two joint members, which is effective in transmitting driving force for magnetic bearings. When used, there is no need to increase the rigidity of the magnetic bearing.

[0009]

【Example】

Embodiments of this invention will be described below with reference to the drawings. In addition, the following theory In the drawings, the top and bottom of Figures 1, 3, and 4 are the top and bottom, and the rotation direction is as shown in Figure 2. This refers to the direction seen from above. Also, regarding the rotation direction, set clockwise to the right. The counterclockwise direction is the left direction.

0010 The magnetic joint is coaxially inserted into the center of the thick-walled cylindrical first joint member (1). and a second joint member (2) having a cylindrical shaft shape. The two joint members (1) and (2) are common A bearing (not shown), such as a magnetic bearing, is used to rotate the They are rotationally supported.

[0011] Permanent magnet devices are installed at four locations that equally divide the opposing circumferential surfaces of the two joint members (1) and (2) in the circumferential direction. Stations (3a), (3b), (3c), and (3d) are provided.

0012 Each permanent magnet device (3a) to (3d) is attached to the inner peripheral surface of the first joint member (1) in the upper and lower and circumferential directions. A first permanent magnet (4a) (4b) (4c) (4d) and a second permanent magnet (5a) fixed at intervals in the direction (5b)(5c)(5d), third permanent magnet (6a)(6b)(6c)(6d) and fourth permanent magnet (7a)(7b)(7c) (7d), and a fifth permanent magnet fixed to the outer peripheral surface of the second joint member (2) between them. Consists of stones (8a) (8b) (8c) (8d). The fifth permanent magnets (8a) to (8d) are attached to the half of the second joint member (2). It extends in the radial direction, and magnetic poles are formed at both ends. 1st to 4th permanent magnets (4a) to (4 d) (5a) - (5d) (6a) - (6d) (7a) - (7d) extend parallel to the fifth permanent magnet (8a) - (8d); Magnetic poles are formed at both ends. And the first to fourth permanent magnets (4a) to (4d) (5a) to (5d) (6a) - (6d) (7a) - (7d) first joint member (1) magnetic pole on the inner peripheral surface side and opposing this The magnetic poles on the outer peripheral surface side of the second joint member (2) of the fifth permanent magnets (8a) to (8d) have the same polarity (in this example In this case, it is N pole).

[0013] In each set of permanent magnet devices (3a) to (3d), the four permanent magnets of the first joint member (1) (4a)~(4d)(5a)~(5d)(6a)~(6d)(7a)~(7d) with magnetic poles of the same polarity (N pole) The magnetic poles of the same polarity (N pole) receives repulsive force, and the four magnetic poles (4a) ~ (4d) (5a) ~ (5d) (6a) ~ (6d) (7a) ~ (7d) held in the middle. And, due to the holding force due to such magnetic repulsion, the two Rotational force and axial driving force are transmitted between the coupling members.

[0014] For example, if the first joint member (1) is the driving side and the second joint member (2) is the driven side, By rotating the first joint member (1) by an appropriate means, the second joint member (2) can also be rotated. By rotating the first joint member (1) in the axial direction, the second joint member (2) also moves in the axial direction.

[0015] Conversely, if the second joint member (2) is the driving side and the first joint member (1) is the driven side, then By rotating the second joint member (2) by a suitable means, the first joint member (1) is also rotated. , by moving the second joint member (2) in the axial direction, the first joint member (1) also moves axially. Move in a line direction.

[0016] The arrangement of the permanent magnets of the permanent magnet device is not limited to the above example, and may be changed as appropriate. It is possible. For example, a permanent magnet on the first joint member side and a permanent magnet on the second joint member side The arrangement may be reversed from that of the above embodiment.

[0017]

[Effect of the idea]

According to the magnetic joint of this invention, as mentioned above, in addition to the rotational force, the axial driving force It is also possible to communicate.

[0018] Moreover, since it is a repulsion type, unbalanced stiffness does not occur and there is no maintenance between the two joint members. Holding force acts, and when used for driving force transmission for magnetic bearings, it increases the rigidity of the magnetic bearings. There's no need to.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a magnetic coupling showing an embodiment of this invention.

FIG. 2 is a horizontal cross-sectional view of the magnetic coupling of FIG. 1;

FIG. 3 is a longitudinal cross-sectional view of the magnetic coupling of FIG. 1;

FIG. 4 is a perspective view showing the arrangement of permanent magnets of the permanent magnet device of the magnetic joint in FIG. 1;

[Explanation of symbols]

(1) First joint member (2) Second joint member (3a)(3b)(3c)(3d) Permanent magnet device (4a)(4b)(4c)(4d) First permanent magnet (5a)(5b)(5c)(5d) Second permanent magnet (6a)(6b)(6c)(6d) Third permanent magnet (7a)(7b)(7c)(7d) Fourth permanent magnet (8a)(8b)(8c)(8d) Fifth permanent magnet

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Ryuji Sugimoto Nichiden A, 5-8-1 Yotsuya, Fuchu-shi, Tokyo Inside Nerva Co., Ltd.

Claims (1)

[Scope of utility model registration request] Claim 1: A shaft-shaped joint member is coaxially inserted into the center of a hollow joint member so as to be able to rotate relative to each other, and permanent magnets are arranged on opposing peripheral surfaces of these two joint members. In a magnetic joint in which a plurality of sets of permanent magnet devices are provided, the permanent magnets of each set of permanent magnet devices are connected to four same polarity magnets spaced apart in the axial direction and the circumferential direction on the opposing circumferential surface of one joint member. A magnetic joint characterized in that magnetic poles are located, and magnetic poles having the same polarity as these four magnetic poles are located in a portion between the four magnetic poles on the opposing circumferential surface of the other joint member.