JP2002218733A - Eddy-current reduction gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eddy-current reduction gear, capable of preventing a conductor with high conductivity disposed at the inner periphery of a rotor, from having high-temperature oxidation and corrosion. SOLUTION: A plurality of conductors 14a to 14d having high conductivity are disposed at prescribed intervals on the inner periphery of the rotor 3 attached onto a rotating shaft to be subjected to breaking. The exposed sections 15a to 15d of the conductors 14a to 14d with high conductivity are covered with protective layers 16a to 16d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eddy current type speed reducer as a retarder for mainly applying deceleration braking to a vehicle, and more particularly, to preventing high-temperature oxidation and corrosion of a good electrical conductor disposed on an inner peripheral surface of a rotor. The present invention relates to an eddy current type speed reducer that achieves the above.

[0002]

2. Description of the Related Art As a conventional eddy current type speed reducer, there is known an eddy current type speed reducer in which copper is disposed at both axial ends of an inner peripheral surface of a rotor mounted on a rotating shaft to be braked. The rotor is made of a conductive material such as iron and a magnetic material.

In this eddy current type speed reducer, copper having smaller electric resistance than iron is arranged on the inner peripheral surface of the rotor.
Eddy currents generated on the inner peripheral surface of the rotor are also attracted to the copper portion. By preventing the eddy current from being concentrated on a part of the inner peripheral surface of the rotor, the temperature of the inner peripheral surface of the rotor is made uniform, thereby preventing thermal deterioration of the rotor.

[0004]

However, in the conventional eddy current type speed reducer, since the copper is exposed, there is a problem that the exposed portion of the copper is exposed to air or moisture and corrodes. Also, the rotor is heated to a high temperature, for example, about 65
Since the temperature is 0 ° C., there is a problem that the exposed portion of copper is oxidized at a high temperature.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an eddy current speed reducer capable of preventing high-temperature oxidation and corrosion of a good electrical conductor disposed on the inner peripheral surface of a rotor.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and the invention according to claim 1 is directed to an inner peripheral surface of a rotor attached to a rotating shaft to be braked. An eddy current speed reducer in which a plurality of electric good conductors are arranged at predetermined intervals in the axial direction, and an exposed portion of the electric good conductor is covered with a protective layer.

According to a second aspect of the present invention, there is provided the eddy current speed reducer according to the first aspect, wherein the protective layer is formed by stacking nickel, a nickel alloy, nickel and a nickel alloy.

According to a third aspect of the present invention, an electric conductor is disposed at a central portion of the inner peripheral surface of the rotor except for both ends in the axial direction.
It is an eddy current type speed reducer as described.

According to a fourth aspect of the present invention, there is provided the eddy current reduction device according to any one of the first to third aspects, wherein the entire inner peripheral surface of the rotor is covered with the metal layer.

[0010]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the following embodiments, an example in which the present invention is applied to an eddy current type reduction device of a drum type slide type will be described.

First, the overall configuration will be described with reference to FIG.

FIG. 7 is a sectional view of the overall configuration of an eddy current type speed reducer according to the present invention.

As shown in FIG. 7, an eddy current type speed reducer 1
Is used as a retarder for preventing the foot brake, which is the main brake, from burning out on a long downhill and applying deceleration braking to the vehicle. For example, an output shaft (for example, a propeller A plurality of magnets 5a to 5c are advanced and retracted in the axial direction by an air cylinder 4 on the inner peripheral side of a rotor 3 attached to a shaft 2). This eddy current type speed reducer 1 has a magnet 5a
To c are short, and the entire apparatus is small.

The rotor 3 is formed in a substantially cylindrical shape from a conductor and a magnetic material, for example, iron, and has one end coupled to a number of spokes 22 extending radially from the boss 21. Cooling fins 6 are provided on the outer periphery of the rotor 3. A plurality of air cylinders 4 are provided on the retreat side of the magnets 5a to 5c.

Each of the magnets 5a to 5c is a permanent magnet formed in a ring shape, and is provided on the outer periphery of the cylindrical yoke 7 at predetermined intervals in the axial direction such that adjacent magnetic poles on the surface side are alternately opposite. It is provided. The magnets 5a to 5c may not be formed in a ring shape, but may be a plurality of magnets divided in the ring circumferential direction and arranged in the circumferential direction of the yoke 7 to form a magnet row. In the present embodiment, a permanent magnet is used as the magnet 5, but an electromagnet may be used.

The magnet 5 and the yoke 7 are covered and protected by a cylindrical case 8. A slide bush 9 is attached to the inner surface of the yoke 7, and the yoke 7 is
The inner bottom surface can be slid smoothly. The outer peripheral portion of the case 8 is made to approach and face the inner peripheral surface of the rotor 3, and a ferromagnetic material (pole piece) 10 a
To c and the nonmagnetic bodies 11a and 11b are alternately arranged in the axial direction of the output shaft.

In the eddy current type speed reducer 1, during braking, a plurality of magnets 5a to 5c are advanced and positioned as shown in the upper half of FIG. 7, and the magnets 5a to 5c and the ferromagnetic bodies 10a to 10c face each other. I do. At this time, a magnetic circuit 12 penetrating the case 8 is formed. As the rotating rotor 3 crosses the magnetic circuit 12, an eddy current is generated on the inner surface of the rotor 3, and a braking force in a direction opposite to the rotating direction acts on the rotor 3 to apply deceleration braking to the vehicle.

On the other hand, at the time of non-braking, as shown in the lower half of FIG. 7, the plurality of magnets 5a to 5c reach the position where the side wall 3a of the magnet 5a on the retreating side and the side surface 3a of the rotor 3 on the air cylinder 4 coincide. Retreat and stop. Since the magnetic circuit 13 formed at this time does not penetrate the case 8, the braking is released.

Now, the eddy current type speed reducer 1 will be described in more detail.

FIG. 1 is a partial sectional view of an eddy current type speed reducer 1 according to a preferred embodiment of the present invention. In the figure, the braking time is represented by a solid line, and the non-braking time is represented by a virtual line.
The same applies to the following embodiments.

As shown in FIG. 1, an eddy current type speed reducer 1
Are arranged at the axially opposite ends of the inner peripheral surface of the rotor 3, ring-shaped electric conductors 14 a and 14 d having an L-shaped cross section, and at the center of the inner peripheral surface of the rotor 3 except for both axial ends. The ring-shaped electric conductors 14b and 14c are arranged, and the exposed portions 15a to 15d of the ring-shaped electric conductors 14a to 14d are covered with protective layers 16a to 16d, respectively.

As the protective layers 16a to 16d, any material may be used as long as it is more stable to air and moisture than the material of the electric good conductors 14a to 14d. For example, nickel, nickel alloy, What consists of what laminated nickel and a nickel alloy is preferable.

In the present invention, the exposed portions 15a to 15d are completely covered with the protective layers 16a to 16d, respectively. In particular, since the exposed portion 15a is exposed not only on the inner peripheral surface of the rotor 3 but also on the side surface 3a of the rotor 3 on the side of the air cylinder 4, the exposed portion 15a extends from the inner peripheral surface of the rotor 3 to the side surface 3a. It is made to cover with the protective layer 16a.
Similarly, the exposed portion 15d on the opposite side is covered with a protective layer 16d from the inner peripheral surface of the rotor 3 to the side surface 3b of the rotor 3 on the spoke 22 side.

As the electric good conductors 14a to 14d, any material may be used as long as it has a lower electric resistance than the material of the rotor 3, and for example, copper is preferably used.

As described above, since the magnets 5a to 5c are arranged at predetermined intervals in the axial direction, the ferromagnetic bodies 10a to 10c provided on the outer peripheral portion of the case 8
They are arranged at predetermined intervals in the axial direction so as to entirely face ac. And each electric good conductor 14a-d,
More specifically, each ferromagnetic material 1 is provided on the inner peripheral surface of the rotor 3.
They are arranged at intervals substantially equal to or greater than the axial width of 0a to 0c. In short, each electric good conductor 1
The elements 4a to 4d may be arranged so as not to face the ferromagnetic bodies 10a to 10c.

This is because when the good electric conductors 14a to 14d are at least slightly opposed to the ferromagnetic materials 10a to 10c, the eddy current is opposed to the ferromagnetic materials 10a to 10c of the good electric conductors 14a to 14d. This is because the temperature of the inner peripheral surface of the rotor 3 becomes non-uniform, and the thermal deterioration of the rotor 3 is promoted.

Normally, the eddy current is concentrated on a portion of the inner peripheral surface of the rotor 3 facing each of the ferromagnetic bodies 10a to 10c. In the present embodiment, the eddy current is generated by the electric good conductors 14a to 14d. It is also drawn into the portion and flows over the entire inner peripheral surface of the rotor 3. Since the temperature of the inner peripheral surface of the rotor 3 becomes uniform, thermal deterioration of the rotor 3, for example, the electrical good conductors 14a to 14d are separated from the rotor 3, or the junction between the electrical good conductors 14a to 14d and the rotor 3 Cracks can be prevented.

Each of the electric good conductors 14a to 14d is not formed in a ring shape, but uses a plurality of electric good conductors divided in the circumferential direction of the ring. May be used.

Further, a cross section L is provided at both ends of the inner peripheral surface of the rotor 3.
By arranging the electric good conductors 14a and 14d in the shape of a letter,
The magnetic flux penetrating through the case 8 can be prevented from leaking to the outside from both sides of the inner peripheral surface of the rotor 3.

Next, the electric good conductors 14a to 14d and the protective layer 1
A method of attaching 6a to 6d to the rotor 3 will be described.

As shown in FIG. 2, first, a ring-shaped recess 1 having an L-shaped cross section is formed at both axial ends of the inner peripheral surface of the rotor 3.
7 (only the concave portion 17d is drawn in the figure), and a ring-shaped concave portion 17 having a rectangular cross section (in the figure, the concave portion 17c is drawn). Ring-shaped electric good conductors 14a to 14d are formed by welding, plating or welding copper on the entire surface of each of the concave portions 17. At this time, the outer surfaces of the electric good conductors 14a and 14d
Exposed portions 15a, 15 exposed on the inner peripheral surface of
5d. The outer surfaces of the electric good conductors 14b and 14c are
The exposed portions 15b and 15c are exposed on the inner peripheral surface of the rotor 3.

Here, masking is performed with resin or the like except for the exposed portions 15a to 15d and their surroundings. Then, for example, when electroless plating is performed to perform nickel plating or nickel alloy plating, or plating in which nickel and a nickel alloy are laminated, the exposed portion 15a that is not masked by the resin is formed.
-D and its surroundings are protected by being covered with protective layers 16a-d. When the masked resin is removed, the electric good conductors 14a to 14d and the protective layers 16a to 16d can be attached to the rotor 3, and the state shown in FIGS. 1 and 2 is obtained.

Further, as shown in FIG.
40 (only the electrical conductors 140c and 140d are illustrated in the figure) on both surfaces.
c, 160d only), a plurality of segments are formed, and the plurality of segments are formed in the respective recesses 170 (recesses 170c, 1 in the figure) formed in the rotor 30.
(Only 70d is drawn). More specifically, first, each recess 170 is formed in the rotor 30. A cylindrical electric good conductor is made, and a protective layer is formed on the inner and outer peripheral surfaces by, for example, immersing the whole in a plating solution. After dividing the cylindrical electric conductor into a plurality of ring-shaped electric conductors at predetermined intervals in the axial direction, each ring-shaped electric conductor is divided at predetermined intervals in the circumferential direction. To make multiple segments. These plurality of segments are connected to each recess 170
Into the state shown in FIG.

As described above, according to the present invention, the exposed portion of the good electrical conductor is completely covered and protected by the protective layer, so that the exposed portion is not exposed to air or moisture and does not corrode. In addition, the rotor is heated to a high temperature, for example, about 650 ° C. due to the eddy current flowing.

FIG. 4 is a partial sectional view of an eddy current type speed reducer 40 according to a second embodiment of the present invention.

As shown in FIG. 4, the eddy current type speed reducer 40
Is a structure in which the entire inner peripheral surface of the rotor 3 is covered with a protective layer 41, and the other structure is the same as that of the eddy current type speed reducer 1 of FIG. In the eddy current type speed reducer 40, since it is not necessary to perform masking, the formation of the protective layer 41 is easier than the protective layers 16a to 16d of the eddy current type speed reducer 1, and the cost is lower.

FIG. 5 is a partial sectional view of an eddy current type speed reducer 50 according to a third embodiment of the present invention.

As shown in FIG. 5, the eddy current type speed reducer 50
The ring-shaped electric good conductors 14b and 14c are arranged at a central portion of the inner peripheral surface of the rotor 51 except for both ends in the axial direction,
The exposed portions 15b, 15c of these ring-shaped electric conductors 14b, 14c are covered with protective layers 16b, 16c, respectively.

More specifically, the electric good conductors 14b and 14c are provided on the inner peripheral surface of the rotor 51 at the center of the ferromagnetic material 1b.
0b are arranged at the same interval as the width in the axial direction.
In short, each electric good conductor 14b, 14c is a ferromagnetic material 1
What is necessary is just to arrange | position so that it may not oppose 0a-c.

Each of the exposed portions 15b and 15c is
b, 16c to completely cover each.
The method of attaching the electric good conductors 14b and 14c and the protective layers 16b and 16c to the rotor 51 is substantially the same as that of the eddy current type speed reducer 1 of FIG.

In the eddy current type speed reducer 50, the eddy current is also attracted to the electric conductors 14b and 14c and flows over the entire inner peripheral surface of the rotor 51. Since the temperature of the inner peripheral surface of the rotor 51 becomes uniform, thermal deterioration of the rotor 51, for example, the electrical conductors 14b and 14c are separated from the rotor 51, or the junction between the electrical conductors 14b and 14c and the rotor 51 Cracks can be prevented.

In the eddy current type speed reducer 50 as well, the exposed portion of the good electrical conductor is completely covered and protected by the protective layer, so that the exposed portion is not exposed to air or moisture and does not corrode. In addition, the rotor is heated to a high temperature, for example, about 650 ° C. due to the eddy current flowing.

FIG. 6 is a partial sectional view of an eddy current type speed reducer 60 according to a fourth embodiment of the present invention. In the eddy current type speed reducer 50 shown in FIG. The entire surface is covered with a protective layer 61. In the eddy current type speed reducer 60, since it is not necessary to perform masking, the formation of the protective layer 61 is easier than the protective layers 16b and 16c of the eddy current type speed reducer 50, and it is inexpensive.

Next, fifth and sixth embodiments in which the present invention is applied to another drum type slide type eddy current type speed reducer will be described with reference to FIGS.

First, the overall configuration will be described with reference to FIGS.

FIG. 10 is a sectional view showing the overall configuration of the eddy current type speed reducer according to the present invention.

As shown in FIG. 10, the eddy current type speed reducer 8
Reference numeral 0 denotes a magnet group 84 provided by an air cylinder 83 on the inner peripheral side of a rotor 82 attached to a rotating shaft 81 to be braked so as to be able to advance and retreat in the axial direction. Magnet group 8
4 moves forward as shown by the solid line at the time of braking and enters the braking state shown in FIG. 10, and at the time of non-braking, it retracts and enters the non-braking state as shown by the virtual line.

The eddy current type speed reducer 80 differs from the eddy current type speed reducer 1 of FIG. 1 in that the magnet group 84 is retracted to a position where the magnet group 84 completely comes out of the inner peripheral surface of the rotor 82 when braking is not performed. .

FIG. 11A is a sectional view taken along the line AA of FIG. 10, and FIG. 11B is a sectional view taken along the line BB of FIG.

As shown in FIG. 11, the rotor 82 is formed in a substantially cylindrical shape. The magnet group 84 includes a plurality of magnets provided at predetermined intervals on the outer periphery of a ring-shaped yoke 85, and is arranged such that adjacent magnetic poles on the surface side are alternately opposite. The magnet group 84 and the yoke 85 are covered and protected by a case 86. A portion of the outer peripheral portion of the case 86 facing the inner peripheral surface of the rotor 82 is arranged so that pole pieces 87 and non-magnetic members 88 which are ferromagnetic materials are alternately arranged in the circumferential direction. A portion 89 of the outer periphery of the case 86 on the retreating side of the magnet group 84 is formed of a ferromagnetic material.

In the eddy current type speed reducer 80, during braking, FIG.
A magnetic circuit a penetrating the pole piece 87 as shown in FIG. 1A is formed, and an eddy current is generated on the inner surface of the rotor 82 when the rotating rotor 82 crosses the magnetic circuit a. The eddy current generates a braking force in the direction opposite to the rotation direction of the rotor 82, and provides deceleration braking to the vehicle. On the other hand, when braking is not performed,
Since the magnetic circuit b as shown in FIG. 1 (b) is formed, the deceleration braking is released.

FIG. 8 is a partial sectional view of an eddy current type speed reducer 80 according to a fifth embodiment of the present invention.

As shown in FIG. 8, the eddy current type speed reducer 80
Are disposed at both ends of the inner peripheral surface of the rotor 82, ring-shaped good electrical conductors 91a and 91b having an L-shaped cross section, and expose the exposed portions 92a and 92b of the good electrical conductors 91a and 91b to the protective layers 93a and 93b. 93b.

FIG. 9 is a partial sectional view of an eddy current type speed reducer 100 according to a sixth embodiment of the present invention. In the eddy current type speed reducer 80 shown in FIG. The entire surface is covered with a protective layer 101.

In the above-described embodiment, an example in which the present invention is applied to a drum type slide type eddy current type speed reducer has been described. However, the eddy current type speed reducer has a drum type by changing a rotor shape and a magnet position. It is roughly classified into a slide type, a drum type rotary type, a disk type rotary type, and the like, and the present invention can be applied to any of these eddy current type speed reducers.

[0056]

As is apparent from the above description,
According to the present invention, the following excellent effects are exhibited.

(1) It is possible to prevent high-temperature oxidation and corrosion of a good electrical conductor disposed on the inner peripheral surface of the rotor.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a preferred embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an inner peripheral surface of a rotor of the eddy current type speed reducer shown in FIG.

FIG. 3 is an enlarged sectional view showing an example of an inner peripheral surface of a rotor.

FIG. 4 is a partial cross-sectional view showing a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional view showing a third embodiment of the present invention.

FIG. 6 is a partial cross-sectional view showing a fourth embodiment of the present invention.

FIG. 7 is a cross-sectional view showing the overall configuration of the eddy current type reduction gear according to the present invention.

FIG. 8 is a partial cross-sectional view showing a fifth embodiment of the present invention.

FIG. 9 is a partial sectional view showing a sixth embodiment of the present invention.

FIG. 10 is a partial cross-sectional view showing the entire configuration of the eddy current type speed reducer according to the present invention.

11A is a cross-sectional view taken along line AA of FIG. 10, and FIG.
FIG. 11 is a sectional view taken along line BB of FIG. 10.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Eddy current type reduction gear 3 Rotor 14a-d Good electrical conductor 15a-d Exposed part 16a-d Protective layer

Claims (4)

[Claims] 1. A plurality of electric good conductors are arranged at predetermined intervals in an axial direction on an inner peripheral surface of a rotor attached to a rotating shaft to be braked, and an exposed portion of the electric good conductor is protected by a protective layer. An eddy current type speed reducer characterized by being covered with: 2. The eddy current reduction gear according to claim 1, wherein the protective layer is made of nickel, a nickel alloy, nickel, and a nickel alloy laminated. 3. The eddy current reduction gear according to claim 1, wherein an electric conductor is disposed at a central portion of the inner peripheral surface of the rotor excluding both ends in the axial direction. 4. The eddy current type reduction gear according to claim 1, wherein the entire inner peripheral surface of the rotor is covered with the protective layer.