JPH0833247A - Method for fixing magnet member to rotor and eddy current retarder - Google Patents

Abstract

PURPOSE:To fix a magnet member rigidly to a rotor without imposing spatial restriction by welding a frame member covering the outer circumference of the magnet member to the outer circumferential face of the rotor. CONSTITUTION:The retarder 100 comprises a rotor 130 secured to a rotary shaft 300, a magnet member 10 facing the inner circumferential face of the rotor 130, a yoke member 120 disposed rotatably about the rotary shaft 300 while supporting the magnet member 10 on the outer circumference thereof, and a drum brake mechanism 110 disposed on the inner circumference of the yoke member 120 and switching the retarder between rotating and nonrotating states. A frame member 40 covers the side face part of the magnet member 10 and the magnet member 10 is fitted, along with the frame member 40, in each of a plurality of grooves made in the outer circumferential face of the yoke member 120. The frame member 40 is then welded to the outer circumferential face of the yoke member 120. Consequently, the magnet member can be fixed rigidly without imposing any spatial restriction thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a technique which can be effectively used for an electric motor as a power source, an eddy current type retarder used as an auxiliary brake of a vehicle, etc., and a magnet member including a permanent magnet is rotated. The present invention relates to a technique of attaching to the outer peripheral surface of a body.

[0002]

BACKGROUND OF THE INVENTION For example, one of retarders used as an auxiliary brake of a vehicle is an eddy current retarder. One of the retarders uses a permanent magnet. The permanent magnet type retarder is advantageous in that it can be made smaller than other eddy current type retarders using an electromagnet. Among them, the one in which a permanent magnet is attached to the outer peripheral surface of the magnet supporting ring having a circular cross section and the magnet supporting ring is rotated in the drum member is particularly useful for reducing the dimension in the rotation axis direction. (See, for example, Japanese Utility Model Laid-Open No. 5-80178).
However, although such a device is particularly excellent in terms of downsizing, it is necessary to firmly support the magnet member. This is because a large centrifugal force acts on the magnet support ring that supports the magnet member and the magnet member that rotates together with the magnet support ring during rotation. According to calculations, for example, weighs about 1 kg
When the magnet member is rotated at 5,000 rpm, a centrifugal force of 4 t or more acts on the magnet member. Therefore, it is necessary to support or attach the magnet member at least to withstand the centrifugal force.

In order to eliminate the need for such a large mounting strength, it may be considered not to rotate the magnet support ring and the magnet member. For example, fix the magnet member side,
It is also possible to move it in the axial direction of the rotating rotor and switch it between a position where the magnetic field is applied to the rotor and a position where it is not applied. However, such a switching method requires a large space in the axial direction. In this respect, it is advantageous in terms of space if the retarder is turned on / off by rotating-non-rotating the magnet member side. Therefore, the inventors have considered increasing the mounting strength of the magnet member on the premise that the magnet member side is rotated.

[0004]

[Related Art and its Problems] One of the techniques for attaching a magnet member to the outer peripheral surface of a magnet support ring is, for example, the actual flat plate 3-7.
There is one disclosed in Japanese Patent No. 4185. This shows a technique in which a pressing member is used and the pressing member and the magnet supporting ring are bolted to each other so that the magnet member is pressed against the outer peripheral surface of the magnet supporting ring. The magnet support ring shown in this publication is of a switching system different from that of the present invention, and the magnet support ring side is always fixed. However, it is of course possible to apply it to the one in which the magnet support ring rotates. In that case, considering the centrifugal force acting on the magnet member as described above, it may be necessary to increase the number of bolts or the bolts themselves. This is because the fastening force by the bolt between the pressing metal member and the magnet support ring, and by extension, the fastening force between the magnet member and the magnet support ring is increased. However, if you do so, the space for mounting the bolt will inevitably increase. Therefore, there is a problem that the space for mounting the magnet member is restricted. Particularly in the eddy current retarder, the size and mounting position of the magnet member have a great influence on the braking force. For example, if a larger magnet member is used, the strength of the magnetic field for generating the eddy current can be further increased, whereby a larger braking force can be obtained. Also, by arranging the magnet member at an appropriate position, a strong magnetic field can be applied to the surface of another member that moves relative to the magnet member, and as a result, a braking force can be obtained efficiently. Therefore, when trying to obtain a large braking force or an efficient braking force,
The problem that the mounting space of the magnet member is limited is
It's a very serious problem.

Similar to such a technique, as a technique for attaching a magnet member to the outer peripheral surface of a rotating body, there is, for example, a technique used in a permanent magnet type electric motor. This technology is a linear member such as a bind wire that is a magnet member arranged on the outer peripheral surface of a rotating body.
Alternatively, it is a technique of winding and fixing using a band-shaped member. However, in this case, since these members are located between the permanent magnet and the surface of another member (for example, the inner peripheral surface of the drum member) that moves relative to the permanent magnet, the permanent magnet-
There is no choice but to take a large air gap with the facing surface. In addition, if the large centrifugal force as described above is taken into consideration, the attachment member has to be made thick, and this air gap becomes even larger.

[0006]

An object of the present invention is to provide an eddy current type retarder or the like using a permanent magnet, even though the magnet member can be firmly supported when it is attached to the outer peripheral surface of the rotating body. It is an object of the present invention to provide a technique for attaching a magnet member to a rotating body that does not restrict the attachment space of the. Another object of the present invention is to provide a technique for attaching a magnet member to a rotating body, which makes it possible to improve the accuracy of positioning the attachment position of the magnet member and dispose the magnet member at an appropriate position. And Still another object of the present invention is to provide a technique for attaching a magnet member to a rotating body, which allows a permanent magnet having a relatively simple shape to be used without performing fine processing on the permanent magnet itself. .

[0007]

As a means for achieving the above object, the present invention uses a technique for attaching a magnet member to a rotating body, which is characterized by the following three points A to C. First characteristic point A: When the magnet member is attached to the rotating body,
A first surface located on the outer side in the radial direction and a second surface located on the inner side in the radial direction and mounted on the outer peripheral surface of the rotating body;
A shoulder portion having a width smaller than the width on the side of the second surface is provided on the peripheral portion on the side of the surface. Second characteristic point B: A frame member covers a side surface portion of the magnet member, the frame member has an inward flange portion at a first end, and the inward flange portion presses a shoulder portion of the magnet member. On the other hand, the second end on the side opposite to the side where the inward flange is located faces the outer peripheral surface of the rotating body. Third characteristic point C: fixing the outer peripheral portion of the frame member on the second end side to the outer peripheral surface of the rotating body by welding. That is, in the present invention, the frame member covering the outer periphery of the magnet member is provided, and the means for fixing the frame member to the outer peripheral surface of the rotating body by welding is used. Further, this magnet member may be a permanent magnet alone, but it is more preferable that the magnet member is composed of two members, a permanent magnet and a pole piece. By doing so, it is possible to overcome the drawbacks due to the material of the permanent magnet.

[0008]

In the first place, the magnet member is a relatively delicate substance because its material is fragile and its magnetic force decreases when exposed to high temperatures. Therefore, it is difficult to directly attach the magnet member itself to the rotating body by machining it. Therefore, in the present invention, this problem is solved by attaching the magnet member to the rotating body via the frame member. Further, the problem can be further considered by forming the magnet member with two members, that is, a permanent magnet and a pole piece. Further, according to such a configuration, it is possible to support the magnet member and the frame member, which exert centrifugal force,
2 of the overlapping portion of the shoulder portion of the magnet member and the inward flange portion of the frame member, and the joint portion by welding of the frame member and the rotating body
In one place. The reason why the shoulder and the inward flange support the magnet member is to support the magnet member in a plane orthogonal to the direction of the centrifugal force, and by doing so, the magnet member obtains strong support. . Further, since the connection by welding is not a point connection like a bolt connection but a line connection, a space for the connection portion can be made small even though a sufficient connection force can be obtained. .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A retarder 1 which is one of the embodiments using this technique is used as a technique for mounting a magnet member in the present invention.
Let's use 00 for explanation. FIG. 1 is an overall cross-sectional view of the retarder 100. This retarder 100 includes a rotary shaft 300 protruding from a differential device 200 of a trailer.
Mounted around the. Such a retarder 100
The rotor 130 fixed to the rotating shaft 300 and the rotor 1
A magnet member 10 that faces the inner peripheral surface of 30; a yoke member 120 that supports the magnet member 10 on the outer periphery and is rotatably provided around a rotation axis 300; and a yoke member 120 that is positioned on the inner periphery of the yoke member 120. And a drum brake mechanism 110 for switching the yoke member 120 between a rotating state and a non-rotating state.
Normally, the yoke member 120 follows the rotor 130 by the magnetic force of the magnet member 10 and rotates together. During braking, the drum brake mechanism 110 brings the yoke member 120 into a non-rotating state to obtain a braking force. At this time, since the rotor 130 continues to rotate together with the rotating shaft 300, relative motion is generated between the magnet member 10 and the inner peripheral surface of the rotor 130 to generate an eddy current, and the braking force of the retarder 100 is generated from this eddy current. Is born.

FIG. 2 is a sectional view of the yoke member 120 of the retarder 100 and the magnet member 10 attached to the outer peripheral surface of the yoke member 120. 3 is a 3-3-3 sectional view of the yoke member 120 shown in FIG. Now, as shown in FIG. 2, the yoke member 120 having a circular cross section.
The plurality of magnet members 10 attached to the outer peripheral surface 122 of
When attached to the yoke member 120, the first surface 11 located on the outer side in the radial direction, the second surface 12 located on the inner side in the radial direction, and the second surface on the peripheral portion on the side of the first surface 11 Face 1
And a shoulder portion 15 having a width smaller than that of the second side. There is a frame member 40 so as to cover the side surface of the magnet member 10,
The frame member 40 includes an inward flange portion 45 at the first end portion 41. The inward flange portion 45 presses the shoulder portion 15 of the magnet member 10. The frame member 40 also includes a second end portion 42 on the side opposite to the side where the inward flange portion 45 is located, and the second end portion 42 faces the outer peripheral surface 122 of the yoke member 120. The shapes of the magnet member 10 and the frame member 40 viewed from the outside in the radial direction are rectangular. The shoulder portion 15 of the magnet member 10 and the inward flange portion 45 of the frame member 40 are provided over the entire circumference thereof. This is because when the centrifugal force acts on the magnet member 10, it is the shoulder portions 15 and the inward flange portion 45 that support the magnet member 10. Therefore, by doing so, the magnet member 10 can be more firmly supported. This is because it can support In this embodiment, when the magnet member 10 is viewed from the outside in the radial direction, the circumference of the first surface 11 having a rectangular shape of about 100 mm in the axial direction and about 50 mm in the circumferential direction is about 5 mm in the axial direction and in the circumferential direction. It has a shape surrounded by 15. An inward flange portion 45 having the same size as the shoulder portion 15 holds the shoulder portion 15. The shoulder portion 15 on the side of the magnet member 10 is connected to the inward flange portion 4 of the frame member 40.
According to the configuration of pressing with 5, the magnet member 10
Even if the temperature of the surroundings rises, the pressing can be reliably performed. That is, there is a thermal expansion difference between the frame member 40 and at least a part of the magnet member (permanent magnet), and when the temperature rises, the clearance slightly increases, but even in such a situation, the magnet member 10 can be reliably retained. Can be supported. When the magnet member 10 and the frame member 40 are attached to the yoke member 120, the first surface 11 of the magnet member 10 is
However, it goes without saying that the frame member 40 is located radially outside of the first end portion 41. Thereby, the magnet member 1
0 and the air gap between the rotor 130 are effectively reduced.

Such a magnet member 10 and a frame member 40
Are fitted and attached to a plurality of groove portions 121 provided on the outer peripheral surface 122 of the yoke member 120, respectively. By providing the groove portion 121 on the yoke member 120 side, the mounting position of the magnet member 10 can be accurately and easily positioned. The positioning groove portion 121 is a groove that penetrates in the axial direction. This is because both the frame member 40 and the yoke member 120 have the same width in the axial direction, which is preferable for keeping the overall axial size of the retarder 100 as small as possible. Because of the groove portion 121, the frame member 40 is attached to the outer peripheral surface 122 of the yoke member 120.
The welding method when welding is different in the axial direction and in the circumferential direction orthogonal thereto. Frame member 40 facing in the circumferential direction
The outer peripheral portions of the two side walls 46a, 46b on the side of the second end 42 are fillet welded S to the outer peripheral surface 122 of the yoke member 120.
(See the partially enlarged view shown in FIG. 4A). On the other hand, the second end portions 42 of the other two side walls 47a, 47b of the frame member facing in the axial direction have Vs on both end faces 127, 128 of the yoke member 120 facing in the same axial direction.
It is fixed by the groove welding G (see the partially enlarged view shown in FIG. 4b). These weldings are welding methods suitable for each welding location, and are performed by arc welding. By the way, the radial depth of the groove 121 is set so that the mounting position of the magnet member can be clearly seen and, moreover, after the magnet member is fitted, it becomes stable.

Each of the plurality of magnet members 10 is composed of a pole piece 20 which is a ferromagnetic body and a permanent magnet body 30. The pole piece 20 includes the first surface 11 and the shoulder portion 15 of the magnet member 10, and the permanent magnet body 30 includes the second surface 12 of the magnet member 10. In the first place, the material of the permanent magnet has relatively high hardness but low toughness,
It is a so-called brittle material. Since the magnet member 10 exerting centrifugal force is supported by the shoulder portion 15, if the magnet member 10 is composed of only permanent magnets, there is a possibility that the magnet member 10 may be broken at the shoulder portion 15 due to its brittleness. . In order to cover such a problem of brittleness of the permanent magnet, the shoulder 15
Is made of a member (= pole piece used here) that is tougher and relatively harder than the magnet member. Further, the contact surfaces 23 and 33 of the pole piece 20 and the permanent magnet body 30 are both flat surfaces. This is to support the permanent magnet body 30 that has exerted centrifugal force on the surface, and also to cover the problem of brittleness of the permanent magnet. At the same time, in order to transfer the magnetic force of the permanent magnet body 30 to the pole piece 20 more reliably, more complete surface contact is required, and this surface contact is easily obtained.

The first surface 21 (= first surface 11 of the magnet member 10) of this pole piece is a curved surface along the circumferential direction of the yoke member 120. This first surface 21 (1
The curved surface of 1) is matched with the inner peripheral surface 131 of the opposing drum-shaped rotor 130, and is formed as such a curved surface in order to reduce the air gap. Further, the second surface 32 of the permanent magnet body 30 (= the second surface 12 of the magnet member)
And the surface 124 on the side of the yoke member 120 (= the bottom surface of the groove 121) with which the second surface 32 contacts are flat surfaces. As described above, it is preferable that each member is configured to be in surface contact with a flat surface because each member is provided at a stable position. The permanent magnet body 30 is a rectangular parallelepiped including two flat surfaces 32 and 33. As described above, it is preferable to use the permanent magnet as the permanent magnet body 30 in a relatively simple shape without performing fine machining. This is because it is desirable to avoid fine machining of the permanent magnet itself because of its thermal characteristics and other problems.

An adhesive is applied between each of the pole piece 20 and the yoke member 120 and the permanent magnet body 30. This adhesive is used to prevent the rust of the permanent magnet body 30 by completely isolating the permanent magnet body 30 itself from the outside air while using it as a temporary fixing before assembling and welding these members. is there. Also,
This adhesive causes the permanent magnet body 3 to be heated by the heat generated when the eddy current is generated.
It also has a function as a buffer member when a difference in thermal expansion occurs between 0 and other members such as the pole piece 20 located around the pole piece 20. In addition, the adhesive will reinforce the welded support against the centrifugal forces associated with rotation. As shown in FIG. 4, a side wall of the permanent magnet body 30 is made of stainless steel or the like and has a thin non-magnetic cover 50 of about 0.1 mm.
It is preferable to cover with. The structure in which the thin cover 50 covers the side surface of the permanent magnet body 30 is advantageous in handling the permanent magnet body 30 due to the protective function of the cover 50. An air gap 60 is formed between the cover 50 and the frame member 40 to secure a clearance for the thermal expansion.

[0015]

According to the present invention, for example, in an eddy current type retarder or the like, when the magnet member is attached and fixed to the outer peripheral surface of the rotating body, the frame member is used and the welding is used for fixing. Although the mounting is strong, the mounting space for the magnet member is not restricted. Therefore, the magnet member can be used efficiently, and particularly in the case of the eddy current retarder, an efficient braking force can be obtained. Further, in the present invention,
Since the permanent magnet itself can be used in a relatively simple shape without much machining, the problems such as brittleness and thermal characteristics of the permanent magnet can be overcome.

[Brief description of drawings]

FIG. 1 is an overall cross-sectional view of a retarder 100 that is an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a yoke member 120 including the magnet member 10.

3 is a 3-3-3 cross-sectional view of the yoke member 120 shown in FIG.

FIG. 4 is an enlarged view of a welded portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 magnet member 11 1st surface 12 2nd surface 15 shoulder part 20 pole piece 30 permanent magnet body 40 frame member 41 1st end part 42 2nd end part 45 inward flange part 120 rotating body (yoke member) 121 Groove 130 Rotor 300 Rotating shaft S Fillet welding G V type groove welding

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshinori Takezawa 6-35 Nakamichi, Tarumi-ku, Kobe-shi, Hyogo Prefecture (72) Teruhisa Oshima 2-15-17 Egawa, Shimamoto-cho, Mishima-gun, Osaka Sumitomo Special Metals Yamazaki Manufacturing Co., Ltd.

Claims (14)

[Claims] 1. A method of arranging and mounting a plurality of magnet members in a circumferential direction on an outer peripheral surface of a rotating body having a circular cross section rotatably supported by a rotating shaft, characterized by the following A to C: And a method of attaching the magnet member to the rotating body. A, each of the magnet members has a first surface located radially outside and a second surface located radially inside and mounted on the outer peripheral surface of the rotating body when attached to the rotating body. Including, the peripheral portion on the side of the first surface is provided with a shoulder portion smaller than the width on the side of the second surface. B, the frame member covers the side surface of the magnet member,
The frame member has an inward flange portion at a first end, and the inward flange portion holds down the shoulder portion of the magnet member, while the second end portion is opposite to the side having the inward flange portion. Faces the outer peripheral surface of the rotating body. C, fixing the outer peripheral portion on the second end side of the frame member to the outer peripheral surface of the rotating body by welding. 2. The rotating body of the magnet member according to claim 1, wherein the second surface of the magnet member is a flat surface, and a portion of the outer peripheral surface of the rotating body facing the second surface is also a flat surface. How to install. 3. A groove portion is provided on an outer peripheral surface of the rotating body, and the groove portion has a size enough to fit the magnet member and the frame member covering the magnet member, and the groove member has the magnet member and the frame. 3. The method for attaching a magnet member to a rotating body according to claim 2, wherein the outer peripheral portion on the second end side of the frame member is fixed to the outer peripheral surface of the rotating body by fillet welding in a state where the member is fitted. 4. When the frame member is attached to the rotating body, the shape of the frame member seen from the radial outside is rectangular,
The width between both side walls of the frame member facing each other in the axial direction is made the same as the width between both end surfaces of the circular shape of the rotating body also facing each other in the axial direction, and the second end portions of both side walls of the frame member are 4. The method for mounting a magnet member to a rotating body according to claim 2, wherein the both ends of the rotating body are fixed by V-shaped groove welding. 5. The magnet member comprises a ferromagnetic pole piece and a permanent magnet body, the pole piece including a first surface and a shoulder portion of the magnet member, the permanent magnet body including the permanent magnet body. 5. The method for attaching the magnet member according to claim 1 to the rotating body, the method including the second surface. 6. The first of the magnet members of the pole piece
Is a curved surface along the circumferential direction of the rotating body, and the mating surface of the pole piece with the permanent magnet body is a flat surface, and the mating surface of the permanent magnet body with the pole piece is also flat. The method of mounting a magnet member on a rotating body according to claim 5, wherein the permanent magnet body is a rectangular parallelepiped including a flat surface on which the pole piece is mated and a second surface of the magnet member. 7. An adhesive is applied between each of the pole piece and the rotating body and the permanent magnet body.
A method for mounting the magnet member according to claim 5 or 6 on a rotating body. 8. A yoke having a circular cross section having a drum-shaped rotor rotatably supported by a rotating shaft, a plurality of magnet members facing the inner peripheral wall of the rotor, and a plurality of magnet members on the outer peripheral surface. In the eddy current retarder, which is a member, and a yoke member supported by the rotating shaft so as to rotate relative to the drum member, the attachment structure of the magnet member to the yoke member is as follows. The eddy current retarder, which is characterized in that A, each of the magnet members has a first surface located radially outside and a second surface located radially inside and mounted on the outer peripheral surface of the yoke member when attached to the yoke member. Including, the peripheral portion on the side of the first surface is provided with a shoulder portion smaller than the width on the side of the second surface. B, the frame member covers the side surface of the magnet member,
The frame member has an inward flange portion at a first end, and the inward flange portion holds down the shoulder portion of the magnet member, while the second end portion is opposite to the side having the inward flange portion. Faces the outer peripheral surface of the rotating body. C, fixing the outer peripheral portion of the frame member on the second end side to the outer peripheral surface of the yoke member by welding. 9. The eddy current retarder according to claim 8, wherein the second surface of the magnet member is a flat surface, and a portion of the outer peripheral surface of the yoke member facing the second surface is also a flat surface. 10. A groove portion is provided on an outer peripheral surface of the yoke member, and the groove portion is large enough to fit the magnet member and the frame member covering the magnet member,
With the magnet member and the frame member fitted in this groove,
The eddy current retarder according to claim 9, wherein the outer peripheral portion of the frame member on the second end side is fixed to the outer peripheral surface of the yoke member by fillet welding. 11. When the frame member is attached to the yoke member, the shape of the frame member as viewed from the outside in the radial direction is rectangular, and the width between both side walls of the frame members facing each other in the axial direction is also the axis line. 10. The width between the two circular end surfaces of the yoke member facing each other in the direction is made the same, and the second end portions of both side walls of the frame member are fixed to both end surfaces of the yoke member by V-shaped groove welding. Or 10 eddy current retarders. 12. The magnet member comprises a ferromagnetic pole piece and a permanent magnet body, the pole piece including a first surface and a shoulder of the magnet member, the permanent magnet body comprising the magnet. The eddy current retarder of claims 8-11 including a second surface of the member. 13. The first surface of the magnet member of the pole piece is a curved surface along the circumferential direction of the yoke member, and the mating surface of the pole piece with the permanent magnet body is a flat surface. The mating surface of the permanent magnet body with the pole piece is also a flat surface, and the permanent magnet body is a rectangular parallelepiped including two mating surfaces with the pole piece and the second surface of the magnet member. An eddy current retarder according to claim 12. 14. The eddy current retarder according to claim 12, wherein an adhesive is applied between each of the pole piece and the yoke member and the permanent magnet body.