JP2002325422A - Eddy current reducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact eddy current reducer having a large damping force. SOLUTION: The eddy current reducer 10 gives reduction braking to a driving shaft 11 of a vehicle or the like, and has the driving shaft 11 of the vehicle or the like, an eddy-current reduction mechanism 12 arranged near the driving shaft 11, a step-up mechanism 13 that is put between the drive shaft 11 and eddy-current reducing mechanism 12 and increases the speed of the driving shaft 11 for inputting to the eddy-current reduction mechanism 12, and cooling means 40 and 41a to 41d for water-cooling or oil-cooling the eddy-current mechanism 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an eddy current reduction device, and more particularly to an eddy current reduction device for a vehicle or the like having a power outlet.

[0002]

2. Description of the Related Art An eddy current reduction device as a retarder for applying deceleration braking to a vehicle or the like is provided with a rotor attached to a drive shaft such as a propeller shaft interlocked with the rotation of a wheel, and a body frame or the like provided in close proximity to the rotor. It consists of a magnetic source such as an electromagnet or permanent magnet attached to the fixed side,
An eddy current is generated in the rotor by a relative speed difference between the fixed-side magnetic force source and the rotating-side rotor to apply braking to the rotation of the rotor and to apply deceleration braking to a vehicle or the like.

[0003]

Incidentally, since the normal eddy current reduction device is directly connected to a drive shaft such as a propeller shaft, the rotation speed of the rotor is the same as the rotation speed of the drive shaft. The braking force increases in proportion to the rotation speed. Further, in the conventional eddy current reduction device, as a method for obtaining a large braking force, there is a method of increasing the rotor diameter or increasing the magnetic force.

However, there has been a problem that an increase in the rotor diameter leads to an increase in the size of the device, and an increase in the magnetic force causes an increase in cost.

An object of the present invention, which has been made in view of the above circumstances, is to provide an eddy current reduction device having a small size and a large braking force.

[0006]

In order to achieve the above object, an eddy current reduction device according to the present invention is an eddy current reduction device for applying deceleration braking to a drive shaft of a vehicle or the like. An eddy current type speed reduction mechanism arranged near the drive shaft, and interposed between the drive shaft and the eddy current type speed reduction mechanism,
The eddy current reduction mechanism is provided with a speed increasing mechanism for increasing the rotation speed of the drive shaft and inputting the input to the eddy current reduction mechanism, and a cooling means for cooling the eddy current reduction mechanism with water or oil.

[0007] According to the above configuration, by inputting the rotation of the drive shaft to the eddy current reduction mechanism via the speed increasing mechanism, it is possible to obtain a small eddy current reduction apparatus having a large braking force. . Further, since the eddy current type speed reduction mechanism includes a cooling unit using water cooling or oil cooling, it is possible to prevent the eddy current type speed reduction mechanism from becoming high temperature.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic plan view of the eddy current reduction device according to the first embodiment, FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.
FIG. 3 is an enlarged view of the stator and the rotor in FIG.
FIG. 4 is a sectional view taken along line 4-4 of FIG.
Shown in

As shown in FIGS. 1 to 5, an eddy current reduction device 10 according to a first embodiment is disposed near a propeller shaft (drive shaft) 11 of a vehicle or the like. An eddy current type speed reducing mechanism 12, and a gear group (increased) that is interposed between the propeller shaft 11 and the eddy current type speed reducing mechanism 12 and increases the rotation speed of the propeller shaft 11 and inputs the speed to the eddy current type speed reducing mechanism 12 (Speed mechanism) 13 and cooling means for cooling the eddy current type reduction mechanism 12 with water or oil.

Here, the eddy current type reduction mechanism 12 is provided with a power take-out port (hereinafter referred to as PTO (Power
Take Off)), for example, P in gearbox 14
It is arranged in the space between the propeller shaft 11 and the frame side member 16a (or 16b) near the TO.
The gear group 13 includes a PTO gear 13a and a driven gear 13b that meshes with the gear 13a and has a smaller number of gears than the gear 13a.

The eddy current type speed reducing mechanism 12 includes a rotating shaft 31 connected to the propeller shaft 11 via a gear group 13, a cylindrical back yoke 32 provided on the outer periphery of the rotating shaft 31, and an outer periphery of the back yoke 32. A rotor 34 composed of a plurality of magnet components 33 arranged in the circumferential direction
A cylindrical stator 35 accommodating the rotor 34;
A casing 36 for accommodating the stator 35 is provided. The stator 35 has a ferromagnetic portion (not shown) in its circumferential direction.
And a non-magnetic part (or a weak magnetic part; not shown) alternately (a so-called pole piece). The magnet structure 33 is provided integrally on the outer periphery of the back yoke 32, and has a plurality of fin-shaped magnetic pole teeth 37 arranged in the circumferential direction, and a winding wound around each magnetic pole tooth 37. And an electromagnet (see FIGS. 3 and 4). Further, as shown in FIG. 2, an inner surface of the casing 36 partially defines a space S between the stator 35 and the casing 36, that is, fixes the stator 35 and the casing 36. 2 is the stator 3)
5 is preferably in contact with the outer surface.

An axial front side of the casing 36, that is, an end surface on the side of the traveling direction of the vehicle or the like (the lower side in FIG. 1, the right side in FIG. 4) surrounds the rotating shaft 31 with an air hole (air intake inlet). 51 may be formed. Thereby, the air (not shown) taken in from the air hole 51 becomes
The rotor 34 can be cooled (air-cooled) from inside by passing between the rotor 34 and the stator 35.

Further, the space S between the stator 35 and the casing 36 may be filled with cooling water (or cooling oil) 40 to form cooling chambers 41a and 41b to form a cooling means. Thereby, the cooling water 40 in each of the cooling chambers 41a and 41b is
The rotor 34 can be cooled from the outside.

Further, the cooling means includes a supply pipe 42 for supplying cooling water 40 to one (upper in FIG. 2) cooling chamber 41a.
a, a discharge pipe 42b for discharging the cooling water 40 from the other (lower in FIG. 2) cooling chamber 41b, and the respective cooling chambers 41a, 4
It may have a circulating member composed of a connection pipe 43 for connecting 1b (see FIGS. 2, 4 and 5). As a circulating member, instead of the connecting pipe 43 shown in FIGS. 2, 4 and 5, as shown in FIG.
A long plate-shaped rib 61 that divides the space S between them (in FIG. 6, it divides into four) may be used. Each rib 61 has a connection hole 62 for connecting each partitioned space S, and is formed separately or integrally with the stator 35 and / or the casing 36. By these circulation members, the cooling water 40 circulates in each of the cooling chambers 41a and 41b (41a to 41d in FIG. 6), and the effect of cooling the stator 35 is further improved. Here, it goes without saying that the supply pipe 42a, the discharge pipe 42b, and the connection pipe 43 are arranged at positions that do not interfere with the frame side member 16a (or 16b), and the supply pipe 42a, the discharge pipe 42b, and the connection pipe 43 are also discharged from the discharge pipe 42b. The cooling water 40 may be recirculated to the supply pipe 42a.

Further, the stator 35 and the casing 36 are both formed of aluminum, and as shown in FIG. 7, a ferromagnetic steel material, for example,
1 may be provided by press-fitting. In this case, the cylindrical body 71 becomes a pole piece. Thus, the weight of the stator 35 and the casing 36 can be reduced, and as a result, the overall weight of the eddy current type speed reduction mechanism 12 can be reduced.

Further, the casing 36 may be made of aluminum and the stator 35 may be made of ferromagnetic steel, or the stator 35 and the casing 36 may be made of ferromagnetic steel. In these cases, it is not necessary to press-fit the steel cylinder 71 into the stator 35. Thereby, the strength of the eddy current type reduction mechanism 12 can be enhanced, and as a result,
The vibration resistance of the eddy current type speed reduction mechanism 12 can be improved.

The stator 35 and the casing 36 may be integrally formed by casting, as shown in FIGS. 2, 4 and 7, or formed separately as shown in FIG. The fixed stator 35 and the casing 36 are connected with fastening means 81 such as bolts.
a and 81b may be fixed and integrated.

Further, in either case where the stator 35 and the casing 36 are formed integrally or separately, at least one end face in the axial direction of the casing 36 (one end face in the left and right direction in FIG. 4) is formed. Alternatively, the opening may be closed with a cover. Thereby, the casing 3
It becomes easy to arrange the stator 35 and the rotor 34 in 6.

A copper piece, which is a good conductor, is arranged on the entire inner surface of the stator 35 or on a part of the inner surface (for example, at both axial ends (left and right ends in FIG. 4) of the stator 35). May be.

Further, the permanent magnet body 21 may be provided in a portion inside the winding 38 in the magnetic pole teeth 37 of the rotor 34 (see FIGS. 2 to 4 and FIGS. 6 to 8). by this,
The magnetic force of the magnet structure 33 is further increased, and as a result, a braking force described later can be further increased.

Next, the operation of the present embodiment will be described.

The driving force of the propeller shaft 11 is taken out from the PTO in the gear box 14, and is passed through the gear group 13, ie, the PTO gear 13a and the driven gear 13b, to the rotating shaft 31 of the eddy current reduction device 10 having the above-described structure. , The rotor 34 rotates together with the rotating shaft 31.

At this time, when an electric current is applied to the coil (winding) 38 of the electromagnet and the eddy current reduction device 10 is in a braking force on state, the rotor 34 rotates and the ferromagnetic portion of the stator 35 The magnetic poles of the opposing electromagnets alternate and the stator 3
The direction of the magnetic flux passing through the ferromagnetic portion (not shown) of the cylinder 5 (or the cylindrical body 71) also alternates with the rotation of the rotor 34. As a result, an eddy current (not shown) is generated in the stator 35.

The eddy current generated in the stator 35 generates a braking force on the rotor 34 that hinders the rotation of the rotor 34,
This braking force acts on the propeller shaft 11 via the rotating shaft 31 and the gear group 13 to apply deceleration braking to a vehicle or the like.

An eddy current reduction device 1 according to the first embodiment
At 0, by adjusting the gear ratio of the gear group 13,
The rotation of the eddy current reduction device 10 can be freely adjusted. Thus, when the vehicle or the like runs at a low speed, that is, when the propeller shaft 11 is rotating at a low speed, the rotor 34 in the eddy current reduction device 10 can be rotated at a high speed. As at the time, a large braking force can be obtained at the position of the propeller shaft 11, and the braking force can be improved. That is, a large braking force can be obtained in spite of the small eddy current reduction device, so that the device configuration can be made compact.

Further, the eddy current reduction device 10 of the present embodiment
Is compact and can provide a large braking force, but the amount of heat generated by the stator 35 (or the cylindrical body 71) in which eddy current is generated increases accordingly. When the temperature of the stator 35 (or the cylinder 71) becomes high, the braking force is reduced. Therefore, in order to perform sufficient cooling, it is necessary to perform water cooling or oil cooling instead of natural heat radiation and / or air cooling. But PT
Since the free space is small near O, the size and shape of the cooling means are restricted. Therefore, in the eddy current reduction device 10 of the present embodiment, the stator 35 and the casing 3
6, the space S is filled with the cooling water 40, and the cooling chambers 41a and 41b (in FIG.
1d). That is, the eddy current reduction device 10 of the present embodiment does not require a special installation space for the cooling means, and therefore can be installed even in a narrow space near the PTO.

Further, the eddy current reduction device 1 of the present embodiment
The cooling means in the frame side member 16a
(Or 16b), the cooling members 41a and 41b (FIG. 6)
Inside, the cooling water 40 circulates in 41a to 41d), and the effect of cooling the stator 35 is further improved.

Next, another embodiment of the present invention will be described with reference to the accompanying drawings.

FIGS. 9 and 10 show cross-sectional views of portions inside the casing of the eddy current reduction device according to the second and third embodiments. The same members as those in FIGS. 1 to 8 are denoted by the same reference numerals.

An eddy current reduction device 1 according to the first embodiment
The zero eddy current type speed reduction mechanism 12 had a pair of a rotor 34 and a stator 35 in a casing 36.

On the other hand, as shown in FIGS. 9 and 10, the eddy current reduction device 9 according to the second and third embodiments
0,100 are a plurality of pairs of rotors 34 in a casing 36.
And a stator 35.

When the number of pairs of the rotor 34 and the stator 35 is two as shown in FIG. 9, each pair is arranged linearly, and two pairs of rotors arranged linearly are arranged. 34 and the stator 35 are surrounded by a casing 36 having a rectangular cross section.
However, when the number of pairs of the rotor 34 and the stator 35 is three or more as shown in FIG. 10, each pair is arranged annularly around the PTO gear 13a, and a plurality of pairs arranged annularly are arranged. It is preferable that the rotor 34 and the stator 35 are surrounded by a casing 36 having a polygonal cross section.

Next, the operation of the second and third embodiments will be described.

By arranging a plurality of pairs of the rotor 34 and the stator 35 in the casing 36, a larger braking force can be obtained as compared with the eddy current reduction device 10 of the previous embodiment. . Therefore, the eddy current reduction devices 90, 1
The rotor 34 and the stator 35 at 00 can be made more compact than the rotor 34 and the stator 35 at the eddy current reduction device 10, so that the eddy current reduction devices 90 and 100 Eddy current reduction device 1
It is possible to install in a narrower space as compared with zero.

A plurality of pairs of rotors 34 and stators 35
Are arranged, a generator (not shown) may be arranged instead of the pair of rotors 34. In this case, the generator is arranged in the casing 36 by press-fitting the stator of the generator formed into a cylindrical shape into the stator 35. In this case, the stator 35 into which the generator is press-fitted may be made of aluminum. As a result, it is possible to supply the electric power generated by the generator to the coil (winding) 38 of the electromagnet in the magnet structure 33 of the rotor 34, and it is not necessary to use the electric power generated by the engine. In addition, the wiring for supplying power to the coil 38 can be easily laid.

Further, it goes without saying that the eddy current reduction devices 90 and 100 according to the second and third embodiments can obtain the same operation and effects as those of the eddy current reduction device 10 according to the first embodiment. No.

As described above, the embodiments of the present invention are not limited to the above-described embodiments, and it is needless to say that various other embodiments can be envisaged.

[0039]

In summary, according to the present invention, the rotation of the drive shaft is input to the eddy current type speed reduction mechanism provided with the water-cooled or oil-cooled cooling means via the speed-increasing mechanism.
In addition, an excellent effect that an eddy current reduction device having a large braking force can be obtained is exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an eddy current reduction device according to a first embodiment.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged view of a stator and a rotor in FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 2;

FIG. 5 is a view in the direction of arrow A in FIG. 1;

FIG. 6 is a cross-sectional view showing another example of the circulation member in the cooling means of FIG. 2;

FIG. 7 is a cross-sectional view showing an example of a case where a tubular body is arranged in a stator.

FIG. 8 is a cross-sectional view showing an example of a state of coupling between a stator and a casing.

FIG. 9 is a cross-sectional view of a part inside a casing of the eddy current reduction device according to the second embodiment.

FIG. 10 is a cross-sectional view of a portion inside a casing of an eddy current reduction device according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Eddy current reduction device 11 Propeller shaft (drive shaft) 12 Eddy current type reduction mechanism 13 Gear group (speed increasing mechanism) 31 Rotation shaft 32 Back yoke 33 Magnet structure 34 Rotor 35 Stator 36 Casing 37 Magnetic pole teeth 38 Winding 40 cooling water (cooling means) 41a-41d cooling chamber (cooling means) 42a supply pipe (circulation member) 42b discharge pipe (circulation member) 43 connecting pipe (circulation member) 61 rib (circulation member) 71 cylinder (steel cylinder) body)

Claims (9)

[Claims] An eddy current reduction device for applying deceleration braking to a drive shaft of a vehicle or the like, comprising: a drive shaft of a vehicle or the like; an eddy current type reduction mechanism disposed near the drive shaft; An eddy current reduction device interposed between the eddy current reduction device and the eddy current reduction device, the rotation speed of the drive shaft being increased and input to the eddy current reduction device. 2. An eddy current type deceleration mechanism comprising: a rotating shaft connected to a driving shaft via a speed increasing mechanism; a cylindrical back yoke provided on the outer periphery of the rotating shaft; Claims: A rotor comprising a plurality of magnet components arranged in a circumferential direction, a cylindrical stator provided surrounding the rotor, and a casing accommodating the rotor and the stator. Item 3. An eddy current reduction device according to Item 1. 3. A fin-shaped magnetic pole tooth provided integrally with an outer periphery of a back yoke, and a plurality of fin-shaped magnetic pole teeth are provided in a circumferential direction, and a winding wound around each magnetic pole tooth. The eddy current reduction device according to claim 2, wherein the electromagnet is configured by: 4. The eddy current reduction device according to claim 1, wherein a plurality of pairs of rotors and stators are provided in the casing. 5. The eddy current reduction device according to claim 1, wherein the cooling means is a cooling chamber in which a space between the stator and the casing is filled with water or oil. 6. The eddy current reduction device according to claim 1, wherein the cooling means has a circulation member for circulating water or oil in the cooling chamber. 7. The eddy current reduction device according to claim 1, wherein the stator and the casing are formed of an aluminum material, and a ferromagnetic steel cylinder is press-fitted inside the stator. . 8. The eddy current reduction device according to claim 1, wherein the stator and the casing are formed of ferromagnetic steel. 9. The eddy current reduction device according to claim 7, wherein the stator and the casing are provided integrally.