JP2003304677A - Eddy-current speed reducer and on-off switching device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the quantity of compressed air consumed for ON-OFF switching. <P>SOLUTION: A fixed support ring 1a provided on the periphery thereof with a plurality of permanent magnets 3a and 3b, with the polarity thereof inverted and a rotational support ring 1b placed in parallel. A plurality of switch plates 2, which are magnetically insulated from each other and made of a ferromagnetic material are placed opposed on the circumferential magnetic pole faces of the permanent magnet 3a and 3b group. Thus, an eddy-current speed reducer is constituted. An ON-OFF switching device is provided with a pair of air cylinders 14 and 15, placed at positions opposite the rotational support ring 1b to rotate the rotational support ring 1b. When either air port of either air cylinder 15 is opened to the air, to switch from an ON state to an OFF state, compressed air is supplied only to the other air cylinder 14 via a control valve 11. As a result, the quantity of compressed air consumed for ON-OFF switching is reduced, and enhancement of the performance of a compressor is obviated. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eddy current reduction device mounted on a large automobile such as a bus or a truck as a braking assist device, and an ON-OFF switching device for the same.

[0002]

2. Description of the Related Art In recent years, for large vehicles such as buses and trucks, the number of times the foot brake is used on a downhill road is reduced to prevent abnormal wear of the lining and the fade phenomenon and to shorten the braking stop distance. For that purpose, an eddy current reduction gear has come to be attached in addition to a foot brake which is a main brake and an exhaust brake which is an auxiliary brake. In recent years, many eddy current speed reducers also use permanent magnets as magnetic poles and do not require energization during braking (for example, Patent Document 1).
reference. ).

[0003]

[Patent Document 1] Japanese Patent Application Laid-Open No. 4-12659 (page 1,
(Fig. 1)

The braking principle of this permanent magnet eddy current speed reducer will be described with reference to FIGS. 9 and 10. As shown in FIG. 9, a fixed support ring 1a for the yoke and a rotation support ring 1
In the case of a structure having two magnet support rings b, the rotation support ring 1b is rotated to a position where the two permanent magnets 3a and 3b on the fixed side and the rotation side facing one switch plate 2 have the same polarity. When moved, the permanent magnets 3 adjacent to each other in the circumferential direction
The switch plate 2 and the cylindrical portion 4 of the rotor 4 are provided between a and 3b.
As shown by the arrow in FIG. 9B, including the inner peripheral surface of a,
A magnetic circuit is configured to be in a so-called braking ON state, and an eddy current is generated on the inner peripheral surface of the cylindrical portion 4a to generate a braking torque.

Further, the turning support ring 1b is turned from the above-mentioned braking ON position, and as shown in FIG. 10, the two permanent magnets 3 on the fixed side and the turning side facing one switch plate 2 are provided.
When the rotation support ring 1b is rotated to a position where the polarities of a and 3b are opposite to each other, one switch plate 2 and two permanent magnets 3a and 3b facing the switch plate 2 are indicated by an arrow in FIG. As shown by, the magnetic circuit is configured, and since the magnetic flux generated from the permanent magnets 3a and 3b does not act on the inner peripheral surface of the cylindrical portion 4a of the rotor 4, no eddy current flows and braking torque is not generated (braking torque). OFF state).

In the permanent magnet type eddy current speed reducer as described above, the control valve 9 for controlling the turning operation of the turning support ring 1b is, as shown in FIG. The flexible hose 10 which is attached to the vehicle body frame and is not provided in the
Was connected with.

Regarding the ON-OFF switching device of the eddy current speed reducer, for large vehicles, the diameter of the support ring is large, and the load of the bearing 8 provided on the inner peripheral side of the rotation support ring 1b. In order to reduce the noise, as shown in FIG. 11, two air cylinders 5 and 6 are arranged at opposite positions of the rotation support ring 1b.
6, the ends of the rods 5a, 6a and the rotation support ring 1b are pivotally supported via a link 7, and each air cylinder 5,
6 was a double-acting type.

[0008]

However, in the conventional eddy current speed reducer in which the control valve for controlling the turning operation of the turning support ring is attached to the vehicle body frame, the control valve is attached to the side surface of the vehicle body frame. There is a drawback that the controllability is poor because a space for this is required separately and the distance from the control valve to the air cylinder becomes long. It is also necessary to arrange the two flexible hoses without causing interference and rubbing. In addition, since the design needs to be performed for each vehicle type, a large number of man-hours are required.

Further, in the conventional ON-OFF switching device, a link mechanism as shown in FIG. 11 is adopted in order to rotate the rotation support ring by the linear cylinder.
In such a structure, since the cylinder thrust transmission efficiency is poor, a large diameter air cylinder is required. Therefore, since it is necessary to design a strength that can withstand it, the mechanism becomes larger than necessary, and the above-mentioned installation space must be secured.

Further, in the conventional ON-OFF switching device that employs two double-acting air cylinders,
Since a large amount of compressed air for switching off is used, it is necessary to increase the compressor capacity depending on the vehicle with the installation of the eddy current speed reducer. In addition, there is no space depending on the mounting location, and it is difficult to secure an air piping space for two circuits.

It is an object of the present invention to provide an eddy current speed reducer and an ON / OFF switching device therefor which can solve the above-mentioned conventional problems.

[0012]

In order to achieve the above object, the present invention uses a control valve to open one air port of one air cylinder to the atmosphere and switch from the ON state to the OFF state. The compressed air is supplied only to the other air cylinder to switch from ON to OFF. And by doing this, O
The amount of compressed air for N-OFF switching can be reduced.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The eddy current reduction device of the present invention is ON-
In the OFF switching device, a fixed support ring and a rotary support ring, which are provided by surrounding a plurality of permanent magnets with their polarities being opposite to each other, are arranged in parallel, and are magnetically insulated from each other on the outer peripheral magnetic pole surfaces of these permanent magnet groups. In order to rotate the rotary support ring of an eddy current reduction device in which a plurality of switch plates made of a ferromagnetic material are opposed to each other, two air cylinders forming a pair are arranged at opposite positions of the rotary support ring. In the ON-OFF switching device, when one air port of one air cylinder is opened to the atmosphere to switch from the ON state to the OFF state, compressed air is supplied only to the other air cylinder via the control valve to turn it ON. It is designed to switch from OFF to OFF.

ON of the eddy current speed reducer of the present invention described above.
With the OFF switching device, the amount of compressed air used for ON-OFF switching can be reduced, so there is no need to increase the compressor capacity.

Further, if the above-mentioned ON-OFF switching device of the present invention is provided in the eddy current speed reducer, the above-mentioned effects are synergized, and further effects can be achieved.

In the eddy current speed reducer of the present invention, a fixed support ring and a rotation support ring, which are provided by surrounding a plurality of permanent magnets with their polarities opposite to each other, are arranged in parallel, and the outer peripheral magnetic poles of these permanent magnet groups are arranged. In the eddy current reduction device in which a plurality of switch plates made of ferromagnetic material magnetically insulated from each other are arranged to face each other, a control valve for controlling the turning operation of the turning support ring is used as the eddy current of the present invention. It is arranged in the speed reducer.

In the above-described eddy current reduction device of the present invention, the space for attaching the control valve to the vehicle body frame is not required, the mounting on the automobile is facilitated, and the rotation of the rotation support ring from the control valve is facilitated. Since the distance to the mechanism becomes shorter,
Controllability is improved.

[0018]

EXAMPLE An eddy current reduction device of the present invention and its ON will be described below.
The -OFF switching device will be described based on the embodiment shown in FIGS. FIG. 1 is a schematic explanatory view of an eddy current reduction device of the present invention corresponding to claim 3, and FIG. 2 is an ON-OFF of the present invention.
2 is a front view of the switching device, FIG. 3 is a sectional view taken along the line AA in FIG.
4 is a sectional view taken along the line BB of FIG. 2, FIG. 5 is a sectional view taken along the line CC of FIG. 2, FIG. 6 is a front view of a main portion of FIG. 1, and FIG. 7 is a sectional view seen from the side of FIG. FIG. 8 is a sectional view showing an air cylinder in which one of the air ports of the ON-OFF switching device of the present invention is open to the atmosphere.

1 to 8, reference numeral 11 denotes a control valve for controlling the turning operation of the turning support ring 1b, and for example, as shown in FIGS. 6 and 7, fixedly supports the fixed support ring 1a. At the same time, the rotary support ring 1b is attached to a support body 12 that supports the rotary support ring 1b in a freely rotatable manner, for example, using bolts 13. The support 12 is made of a non-magnetic material such as aluminum, and the transmission 2 is formed as shown in the example of FIG.
It is attached to the case of 0.

Therefore, in this embodiment, the space for mounting the control valve 11 on the vehicle body frame is unnecessary, and the distance to the main cylinder 14 and the sub-cylinder 15 which will be described later is shortened, so that the controllability is improved. . Further, the flexible hose 10 for connecting the vehicle body frame and the eddy current reducer, which was required in the conventional structure shown in FIG. 11, required two, but in the present invention, only one is required as shown in FIG. , The flexible hose 1 without considering the friction and interference between the flexible hoses 10 as in the conventional case.
0 can be placed.

Reference numerals 14 and 15 denote a main cylinder and a sub-cylinder to which compressed air is supplied via the control valve 11, of which the main cylinder 14 is the same as the conventional one.
It is a double-acting cylinder that supplies compressed air from both air ports 14a and 14b. On the other hand, sub cylinder 1
5, the compressed air is supplied from one air port 15a, but the other air port 15b is open to the atmosphere via a filter 15c, as shown in FIGS. 1, 2 and 8.

When the sub cylinder 15 is constructed as described above, compressed air is supplied to the main cylinder 14 and the sub cylinder 15 via the control valve 11 from the OFF state shown in FIG. When the output of the cylinder when turned in the counterclockwise direction to be in the ON state is F1, conversely, compressed air is supplied only from the ON state to the main cylinder 14 via the control valve 11 to provide the rotation support ring. 1
The output F2 of the cylinder when b is turned clockwise to be in the OFF state is 1/2 or less of F1 because the supply amount of compressed air is sufficient only in the main cylinder 14, but this device This is a sufficient output due to the ON / OFF switching load characteristics of the electromagnetic circuit.

Reference numerals 17 and 18 denote U-shaped tip metal fittings attached to the tips of the piston rods 14c and 15d of the main cylinder 14 and the sub-cylinder 15, respectively. The support ring 1b is rotatably supported by a roller 19 which is supported by the tip metal parts 17 and 18 in an embraced manner.
The roller 19 may be attached to the rotation support ring 1b at the outer periphery of the rotation support ring 1b as shown in FIG. 1 or at the side surface of the rotation support ring 1b as shown in FIG. .

The above-described present embodiment relates to the eddy current reduction device according to claim 3 provided with the ON-OFF switching device having the structure according to claim 1, but the present invention is not limited to this. Needless to say.

That is, one of the air ports 15b of the sub-cylinder 15 is opened to the atmosphere, and the main cylinder 14 alone is used to switch from ON to OFF. The eddy current speed reducer described in 2 may be used.

Further, in this embodiment, the main cylinder 14
The drive source of the sub-cylinder 15 and the sub-cylinder 15 have been described using compressed air, but it goes without saying that another drive source such as hydraulic pressure may be used.

[0027]

As described above, according to the present invention,
It has the effects of and and.

Since it is possible to reduce the amount of ON-OFF switching compressed air used, it is not necessary to increase the compressor capacity. A space for installing a control valve on the side surface of the vehicle body frame is not required, mounting on a vehicle is easy, and the distance from the control valve to the rotation mechanism of the rotation support ring is short, so controllability is improved. improves.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of an eddy current reduction device of the present invention corresponding to claim 3. FIG.

FIG. 2 is a front view of an ON-OFF switching device of the present invention.

3 is a cross-sectional view taken along the line AOA of FIG.

FIG. 4 is a view taken along the line BB of FIG.

5 is a sectional view taken along line CC of FIG.

FIG. 6 is a front view of a main part of FIG.

7 is a cross-sectional view as seen from the side surface of FIG.

FIG. 8 is a cross-sectional view showing an air cylinder in which one air port of the ON-OFF switching device of the present invention is open to the atmosphere.

FIG. 9 is an explanatory diagram of a braking principle in a braking ON state of a permanent magnet type eddy current speed reducer, in which (a) is a vertical cross-sectional side view,
(B) is a vertical cross-sectional front view.

FIG. 10 is an explanatory view of the braking principle of the permanent magnet type eddy current speed reducer in the braking OFF state, in which (a) is a vertical sectional side view,
(B) is a vertical cross-sectional front view.

FIG. 11 is a schematic explanatory diagram of a conventional eddy current speed reducer.

[Explanation of symbols]

1a Fixed support ring 1b Rotation support ring 2 switch board 3a Permanent magnet 3b Permanent magnet 11 Control valve 14 Main cylinder 15 sub cylinder 17 advanced hardware 18 advanced hardware 19 Laura

Claims (3)

[Claims] 1. A fixed support ring and a rotary support ring, which are provided around a plurality of permanent magnets with their polarities being opposite to each other, are arranged in parallel, and are magnetically insulated from each other on the outer peripheral magnetic pole faces of these permanent magnet groups. In order to rotate the rotary support ring of an eddy current reduction device in which a plurality of switch plates made of a ferromagnetic material are opposed to each other, two air cylinders forming a pair are arranged at opposite positions of the rotary support ring. In the ON-OFF switching device, when one air port of one air cylinder is opened to the atmosphere to switch from the ON state to the OFF state, compressed air is supplied only to the other air cylinder via the control valve to turn it ON. An ON-OFF switching device for an eddy current speed reducer, which is characterized in that switching from ON to OFF is performed. 2. An eddy current deceleration device comprising the ON-OFF switching device according to claim 1. 3. A fixed support ring and a rotary support ring, which are provided around a plurality of permanent magnets with their polarities being opposite to each other, are arranged in parallel, and are magnetically insulated from each other on the outer peripheral magnetic pole surfaces of these permanent magnet groups. In an eddy current reduction device having a plurality of ferromagnetic switch plates arranged opposite to each other, a control valve for controlling a turning operation of a turning support ring is provided in the eddy current reduction device. The eddy current reduction device according to.