JP4438016B1 - Rotary power feeder - Google Patents

Abstract

The present invention provides a simple and durable rotary power feeding device and a power feeding method capable of supplying a large current while suppressing arc discharge to an armature coil of a DC motor that is easy to control.
A ring-shaped internal gear 1 that is conductively connected to a power supply unit 6, a planetary pinion 2 that is in mesh with the internal gear 1, and an outer periphery of a rotary shaft 8 that is positioned at the center of the internal gear 1 are fixed to the outer periphery of the planetary gear. A sun gear 3 circumscribingly engaged with the pinion 2, and the planetary pinion 2 and the sun gear from the internal gear 1 to the planetary pinion 2 and the conductive contact between the tooth surfaces of the planetary pinion 2 and the sun gear 3. 3 is a device for supplying power to the electric load E. A magnetic field along the axial direction is applied by a permanent magnet 14 to the meshing position of the internal gear 1 and the planetary pinion 2. A magnetic field along the axial direction is also applied to the meshing position between the planetary pinion 2 and the sun gear 3 by the permanent magnet 15.
[Selection] Figure 1

Description

The present invention relates despite the device for powering the electrical load such as DC motor, to rotary feed apparatus which allow the power supply while suppressing the arc discharge caused by the opening and closing of the conductive contact portion, particularly for electrical load concerning.

  In recent years, the spread of hybrid vehicles using both a prime mover (internal combustion engine) and an electric motor has been remarkable. Such hybrid vehicles also have a parallel type in which both a prime mover and an electric motor are alternately switched as wheel drive sources, and a series type in which the prime mover is exclusively used for power generation to obtain the drive power of the motor. Accordingly, there is an increasing trend in electric vehicles that drive electric motors for traveling using stored electric power from batteries and electric power generated from fuel cells.

  On the other hand, as an electric motor, a DC motor driven by a DC power source and an AC motor driven by an AC power source are known. In a DC motor using a commutator and a brush, a commutator piece made of copper or the like and carbon are used. In addition to the problem of excessive wear due to sliding contact with the brush, there is a problem of generating sparks due to noise and arc discharge, and it is not possible to make a large amount of current due to the energization restriction by the carbon brush, so it can be made brushless A complicated electronic circuit must be constructed by using a large number of transistors.

  For this reason, in a hybrid vehicle, an electric vehicle, a fuel cell vehicle, and the like, an AC motor is used as an electric motor, and an AC motor is driven by converting a DC power source into an AC power source by an inverter (for example, Patent Document 1).

JP 2006-333552 A

  However, according to a vehicle using an AC motor (AC servo motor) as a driving source for traveling, an expensive inverter and other complicated control equipment are required to convert a DC power source into an AC power source, resulting in high costs. There's a problem.

  The present invention has been made in view of the above circumstances, and its purpose is durability capable of supplying a large current while suppressing arc discharge to an armature coil of a DC motor that is easy to control. It is an object of the present invention to provide a simple and convenient rotary power supply apparatus and power supply method.

In order to achieve the above object, the present invention
A ring-shaped internal gear that is conductively connected to the power supply unit, a planetary pinion that meshes internally with the internal gear, and a sun gear that is fixedly attached to the outer periphery of a rotating shaft located at the center of the internal gear and externally meshes with the planetary pinion A rotary type that feeds an electric load from the internal gear through the planetary pinion and the sun gear by conductive contact between the tooth surfaces of the internal gear and the planetary pinion and the planetary pinion and the sun gear. A power feeding device,
A first magnetic field generator that forms a magnetic field along the axial direction of the internal gear and the planetary pinion at the meshing position thereof;
And a second magnetic field generator which forms a magnetic field along the axial direction of both at the meshing position between the sun gear and the planetary pinion,
The internal gear, the planetary pinion, and the sun gear each have a tooth surface plated with a refractory metal .

In addition, the internal gear, the planetary pinion, and the sun gear are each provided with an electrically insulating insulating coating that prevents arc discharge at the tooth tips .

Also, a ring-shaped internal gear that is conductively connected to the power supply unit, a planetary pinion that is internally meshed with the internal gear, and an outer periphery of a rotating shaft that is positioned at the center of the internal gear and is externally meshed with the planetary pinion And an electric load is supplied from the internal gear to the electric load through the planetary pinion and the sun gear by conductive contact between tooth surfaces of the internal gear and the planetary pinion and the planetary pinion and the sun gear. A rotary power feeder,
A first magnetic field generator that forms a magnetic field along the axial direction of the internal gear and the planetary pinion at the meshing position thereof;
A second magnetic field generator that forms a magnetic field along the axial direction of the planetary pinion and the sun gear at the meshing position thereof ,
The internal gear, the planetary pinion, and the sun gear are each provided with an electrically insulating insulating coating that prevents arc discharge at the tooth tips.

According to the apparatus of the present invention, a ring-shaped internal gear that is conductively connected to the power supply unit, a planetary pinion that meshes with the internal gear, and an outer periphery of the rotary shaft that is positioned at the center of the internal gear are fixed to the planet. Using a planetary gear mechanism having a sun gear externally meshed with the pinion, the inner gear and the planetary pinion and the contact between the planetary pinion and the sun gear are electrically connected to each other through the planetary pinion and the sun gear. Since power is supplied to the load, large DC power can be continuously supplied to the electric load that is rotationally driven.

  In addition, since the magnetic field along the axial direction is applied to the meshing position of the internal gear and the planetary pinion and the meshing position of the planetary pinion and the sun gear, arc discharge generated between the tooth surfaces. It is possible to blow out the arc sparks by applying the Lorentz force to the power supply, and power supply with high safety becomes possible.

  Furthermore, according to the planetary gear mechanism composed of the internal gear, the planetary pinion, and the sun gear, the number of times that the tooth surfaces contact / separate between the internal gear and the planetary pinion and between the planetary pinion and the sun gear is rotated by the electric load. Since the number of arc discharges generated between the tooth surfaces can be reduced and the contact form between the tooth surfaces that are in conductive contact is rolling contact, there is little wear on the tooth surfaces and high durability. Sex can be obtained.

  In addition, internal gears, planetary pinions, and sun gears are plated with a refractory metal on the tooth surfaces that are in conductive contact. Can be suppressed.

  Further, by applying an electrically insulating insulating coating to the tooth tips of the internal gear, the planetary pinion, and the sun gear, arc discharge between the tooth tips and between the tooth tips and the tooth surfaces can be prevented.

1 is a longitudinal sectional view showing a rotary power feeder according to the present invention. Schematic plan view showing the planetary gear mechanism constituting the device Partial enlarged sectional view of the device The top view which shows the meshing part of the internal gear and planetary pinion which comprise a planetary gear mechanism Explanatory drawing which partially expanded and showed FIG.

  Hereinafter, the present invention will be described in detail with reference to the drawings. As is apparent from FIG. 1, the rotary power feeding device according to the present invention includes a ring-shaped internal gear 1, a planetary pinion 2 that meshes internally with the internal gear 1, and a sun gear that meshes externally with the planetary pinion 2. And a planetary gear mechanism consisting of three. Reference numeral 4 denotes a casing that forms the exterior of the apparatus, and a yoke 5 made of a magnetic material is fixed inside the casing. The yoke 5 has a ring shape having an E-shaped cross section, and two internal gears 1 made of a nonmagnetic material are fixed thereto. In particular, the internal gear 1 is made of copper or another conductive member that is conductively connected to an external power source 6 (DC power source), and an electric insulator 7 a is interposed between the yoke 5 and the internal gear 1.

  In FIG. 1, reference numeral 8 denotes a rotating shaft located at the center of the internal gear 1, and the rotating shaft 8 is rotatably supported by a bearing 9 a fixed to the casing 4. A yoke 10 made of a magnetic material is fixed to the outer periphery of the rotary shaft 8, and two sun gears 3 made of a non-magnetic material are fixed to the yoke 10 corresponding to the internal gear 1. These sun gears 3 are also made of copper or other conductive members, like the internal gear 1, and an electrical insulator 7 b is interposed between the yokes 10.

  A plurality of planetary pinions 2 are arranged at equal intervals between the internal gear 1 and the sun gear 3 located on the same plane. FIG. 2 shows an example in which four planetary pinions 2 are arranged at intervals of 90 degrees. However, only one planetary pinion 2 may be provided, and the number of arrangements is not particularly limited.

  In FIG. 1, reference numeral 11 denotes a pinion carrier that supports each planetary pinion 2, and this pinion carrier is rotatably provided on the rotating shaft 8 via a bearing 9 b. In particular, the pinion carrier 11 is provided on the rotary shaft 8 so as to be opposed to each other with the two sun gears 3 facing each other in the axial direction, and both the pins 11 and 11 pass between the internal gear 1 and the sun gear 3. The planetary pinion 2 made of a non-magnetic material is rotatably supported on the fulcrum shaft 12 via a bearing 9c. These planetary pinions 2 are also made of copper or other conductive members, like the internal gears 1 and the sun gears 3, whereby the internal gears 1 and the sun gears 3 are conductively connected via the planetary pinions 2.

  In particular, the sun gear 3 is conductively connected by the lead wire 13 to the electric load E provided on the rotating shaft 8 at the inner peripheral portion thereof, whereby the planetary pinion 2 and the internal gear 1 conductively connected to the power source unit 6 are connected. Electric power is supplied to the electric load E through the sun gear 3.

  Here, the electric load E is, for example, a known DC motor, more specifically, an armature coil that constitutes the rotor of the DC motor. When power is supplied to this, the rotary shaft 8 that is the drive shaft of the motor is a sun gear. 3, and the planetary pinion 2 rotates (revolves) around the fulcrum shaft 12 while rotating (revolving) around the sun gear 3, but the internal gear 1, the planetary pinion 2, and the planetary Due to the meshing of the pinion 2 and the sun gear 3, the internal gear 1 and the sun gear 3 are maintained in a conductive state, and the electric load E is continuously fed. However, during power feeding, the tooth surfaces of the internal gear 1, the planetary pinion 2, and the sun gear 3 are sequentially brought into conductive contact and separated from each other, so that arc discharge is generated between the separated tooth surfaces. For this reason, according to the present invention, the ring-shaped permanent magnet 14 is fixed as the first magnetic field generating portion to the yoke 5 to which the internal gear 1 is fixed, and the second magnetic field is generated to the yoke 10 to which the sun gear 1 is fixed. A ring-shaped permanent magnet 15 is fixed as a part.

  As is apparent from FIG. 3, three permanent magnets 14 are provided so as to sandwich two internal gears 1 that are opposed in the axial direction from the axial direction. A magnetic field is formed along the axial direction of both 1 and 2 (vertical direction in FIG. 3) at the meshing position of 1 and the planetary pinion 2. Also, three permanent magnets 15 are provided so as to sandwich two sun gears 3 opposed in the axial direction from the axial direction, and the planetary pinion 2, the sun gear 3, and the like are caused by the magnetic flux emitted from each permanent magnet 15. Magnetic fields are formed along the axial directions of the two and the third at the meshing position.

  The permanent magnets 14 and 15 may be metal magnets or sintered magnets, but neodymium magnets having a large holding force are preferable, and they are ring-shaped as described above so as to cover the entire meshing portion of the planetary gear mechanism. Is preferred. However, electromagnets may be employed in place of the permanent magnets 14 and 15.

  In FIG. 3, reference numeral 16 denotes a connection pin attached to the internal gear 1 and the sun gear 3, which is connected to the lead wire 13 shown in FIG. As is clear from FIG. 3, the outer periphery of the fulcrum shaft 12 that supports the planetary pinion 2 is covered with an electrical insulator 7c, and the electrical insulator 7d is interposed between the planetary pinion 2 and the pinion carrier 11. Thus, the planetary pinion 2 and the pinion carrier 11 are electrically insulated.

  And according to the rotary electric power feeder comprised as mentioned above, while reducing the abrasion of a contact surface by the rolling contact of the internal gear 1, which consists of an electrically-conductive member, the planetary pinion 2, and the sun gear 3, the contact surfaces are reduced. The energization amount can be increased, and the magnetic field by the permanent magnets 14 and 15 is applied to the meshing position of the internal gear 1 and the planetary pinion 2 and the meshing position of the planetary pinion 2 and the sun gear 3. Thus, arc discharge generated between tooth surfaces parallel to the magnetic field direction can be suppressed.

In particular, according to the present invention, as shown in FIGS. 4 and 5, the internal gear 1 and the planetary pinion 2 that is in mesh with the internal gear 1 include on and around the pitch circles p ₁ and p ₂ , respectively. The tooth surfaces are plated with high melting point metals such as molybdenum and tungsten, and 1m and 2m are coated with insulating coatings 1i and 2i made of electrically insulating ceramic. According to this, even if an arc discharge I occurs between the tooth surfaces that are in conductive contact as shown in FIG. 5, the tooth surfaces can be protected by plating 1m, 2m with a refractory metal and the deterioration can be prevented. Moreover, arc discharge between the tooth tip and the tooth surface can be prevented by the insulating coatings 1i and 2i. Here, as shown in FIG. 5, when an arc discharge I is generated between the tooth surfaces, the arc discharge I is orthogonal to the magnetic field applied by the permanent magnet 14 of FIG. The Lorentz force F based on Fleming's left-hand rule is generated in the direction in which the flame discharges, and the Lorentz force F acts to blow off the spark caused by the arc discharge I.

  4 and 5 show the meshing portion between the internal gear 1 and the planetary pinion 2, the sun gear 3 has the same tooth structure as the internal gear 1 and the planetary pinion 2. At the meshing position, a Lorentz force that cancels the arc spark is generated by the magnetic field generated by the permanent magnet 154.

  Next, the function of the rotary power feeder will be described. In FIG. 1, the DC power of the power supply unit 6 is supplied to the electric load E through the upper internal gear 1, the planetary pinion 2, and the sun gear 3 in FIG. 1, and then the lower solar gear 3 and the planetary pinion 2 in FIG. 1. , And return to the power supply unit 6 through the internal gear 1. When the electric load E is rotated in one direction by supplying power to the electric load E, the rotating shaft 8 and the sun gear 3 integrated therewith rotate in the same direction.

  As shown in FIG. 2, when the sun gear 3 rotates clockwise, the planetary pinion 2 circumscribing the planetary gear rotates (revolves) clockwise while rotating (rotating) counterclockwise. Thus, between the internal gear 1 and the planetary pinion 2 and between the planetary pinion 2 and the sun gear 3, the tooth surfaces are repeatedly brought into electrical contact and separated. For this reason, arc discharge is generated between the tooth surfaces, but magnetic fields by the permanent magnets 14 and 15 are applied to the meshing positions of the internal gear 1 and the planetary pinion 2, and the planetary pinion 2 and the sun gear 3, respectively. Since it continues, the Lorentz force F acts on the arc discharge I, and the spark caused by the arc discharge I is stretched out.

  In particular, according to the planetary gear mechanism composed of the internal gear 1, the planetary pinion 2, and the sun gear 3 according to the present invention, the sun gear 3 is driven in a state where the internal gear 1 is fixed, so that the rotation of the planetary pinion 2 is performed. It functions as a reduction gear 21 whose output decreases. For example, if the number of teeth of the internal gear 1 is “40” and the number of teeth of the sun gear 3 is “20”, the reduction ratio is (40 + 20) / 20 = 3, and the sun gear 3 and the rotary shaft 8 rotate once. In the meantime, planetary pinion 2 revolves by 120 degrees. For this reason, the contact / separation of the tooth surfaces between the internal gear 1 and the planetary pinion 2 and between the planetary pinion 2 and the sun gear 3 is smaller than the rotational speed of the electric load E, and thus the number of arc discharges. It will be reduced. For this reason, it is possible to supply a large DC power to a vehicle running DC motor or the like that requires a high output as a power supply device with high durability and safety.

  Although specific examples of the present invention have been described above, the electric load E to be supplied can be supplied not only to the DC motor but also to other rotating electric devices.

E Electric load (Power supply target)
DESCRIPTION OF SYMBOLS 1 Internal gear 1m Refractory metal plating 1i Insulation coating 2 Planetary pinion 2m Refractory metal plating 2i Insulation coating 3 Sun gear 6 Power supply unit 8 Rotating shaft 11 Pinion carrier 14 Permanent magnet (first magnetic field generation unit)
15 Permanent magnet (second magnetic field generator)

Claims (3)

A ring-shaped internal gear that is conductively connected to the power supply unit, a planetary pinion that meshes internally with the internal gear, and a sun gear that is fixedly attached to the outer periphery of a rotating shaft located at the center of the internal gear and externally meshes with the planetary pinion A rotary type that feeds an electric load from the internal gear through the planetary pinion and the sun gear by conductive contact between the tooth surfaces of the internal gear and the planetary pinion and the planetary pinion and the sun gear. A power feeding device,
A first magnetic field generator that forms a magnetic field along the axial direction of the internal gear and the planetary pinion at the meshing position thereof;
And a second magnetic field generator which forms a magnetic field along the axial direction of both at the meshing position between the sun gear and the planetary pinion,
The internal gear, the planetary pinion, and the sun gear each have a toothed surface plated with a refractory metal . 2. The rotary power feeding device according to claim 1 , wherein each of the internal gear, the planetary pinion, and the sun gear is provided with an electrically insulating insulating coating that prevents arc discharge at the tooth tip. . A ring-shaped internal gear that is conductively connected to the power supply unit, a planetary pinion that meshes internally with the internal gear, and a sun gear that is fixedly attached to the outer periphery of a rotating shaft located at the center of the internal gear and externally meshes with the planetary pinion A rotary type that feeds an electric load from the internal gear through the planetary pinion and the sun gear by conductive contact between the tooth surfaces of the internal gear and the planetary pinion and the planetary pinion and the sun gear. A power feeding device,
A first magnetic field generator that forms a magnetic field along the axial direction of the internal gear and the planetary pinion at the meshing position thereof;
And a second magnetic field generator which forms a magnetic field along the axial direction of both at the meshing position between the sun gear and the planetary pinion,
The rotary power feeding device, wherein the inner gear, the planetary pinion, and the sun gear are each provided with an electrically insulating insulating coating that prevents arc discharge at the tooth tips.

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