JP2004023979A - In-vehicle power generator - Google Patents

Abstract

The present invention relates to an on-vehicle generator configured to maintain a stationary state irrespective of rotation of a wheel, and to achieve large power generation in a compact shape.
A rotating member that rotates integrally with a disk wheel with rotation of a wheel, and is arranged coaxially with the rotating member and maintains a stationary state regardless of rotation of the rotating member. The stationary member 23, the annular magnets 28A to 28D disposed on the stationary member 23, and the plurality of coils 24 disposed on the rotating member 22 and configured by winding the winding 52 around the core 46. is configured, in-vehicle power generator for generating electric power from the fact that the ring magnet 28A~28D and the coil 24 with the rotation of the rotary member 22 rotate relative to each other, the central axis X ₀ of the core 46, rotary member 22 Is configured so as to be parallel to the rotation center X.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an on-vehicle generator, and more particularly, to an on-vehicle generator that generates electric power by the rotational force of wheels.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a configuration in which an in-vehicle generator is provided on a disk wheel of an automobile, and an electric device (for example, an illumination or the like) provided on the disk wheel is driven by electric power generated by the in-vehicle generator. 6 to 8 show a vehicle-mounted generator 1 as an example of the related art. 6 is an exploded side sectional view of the on-board generator 1, FIG. 7 is a side sectional view of the assembled on-board generator 1, and FIG. 8 is a rotating member 2 provided on the on-board generator 1. FIG.
[0003]
As shown in FIGS. 6 and 7, the on-vehicle generator 1 is generally constituted by a rotating member 2 fixed to a disk wheel and a stationary member 3 rotatably disposed on the rotating member 2. . The rotating member 2 is provided with a first core member 4 and a second core member 5 (detailed in FIG. 8).
[0004]
The first core member 4 is provided with a plurality of pole tooth cores 4 a, which are formed so as to extend radially outward with respect to the center position of the rotating member 2. The coil 6 is wound around each pole tooth core 4a.
[0005]
Similarly, the second core member 5 is provided with a plurality of pole tooth cores 5 a, which are formed so as to extend radially outward with respect to the center position of the rotating member 2. I have. The coil 7 is wound around each pole tooth core 5a. Further, an opening 9 is formed in the center of the rotating member 2, and a bearing 8 is provided in the opening 9.
[0006]
On the other hand, the stationary member 3 is provided with an annular first ring magnet 12 and a second ring magnet 13. Further, a weight 14 is provided below the stationary member 3. When the stationary member 3 is mounted on the rotating member 2, the shaft 10 formed at the center is fitted to the bearing 8, whereby the rotating member 2 and the stationary member 3 can relatively rotate. Further, in a state where the stationary member 3 is attached to the rotating member 2, as shown in FIG. 7, the first ring magnet 12 is arranged on the outer periphery of the first core member 4 so as to face the pole tooth core 4a. The second ring magnet 13 is disposed on the outer periphery of the second core member 5 so as to face the pole tooth core 5a.
[0007]
As described above, since the rotating member 2 is fixed to the disk wheel, it rotates integrally with the disk wheel. On the other hand, the stationary member 3 is provided with a weight 14 and is rotatably supported by the bearing 8 on the rotating member 2. For this reason, the stationary member 3 maintains a stationary state regardless of the rotation of the rotating member 2.
[0008]
Accordingly, when the wheel rotates, the rotating member 2 rotates with respect to the stationary member 3 which is stationary, and accordingly, the first and second core members 4 with respect to the first and second ring magnets 12 and 13. , 5 rotate, thereby generating an electromotive force in the coils 6 and 7 to generate power.
[0009]
[Problems to be solved by the invention]
By the way, the electronic equipment to be supplied with power by the above-described on-vehicle generator 1 tends to require a large amount of electric power as its sophistication increases. To cope with this, it is necessary to increase the number of coils provided in the vehicle-mounted generator 1.
[0010]
However, since the vehicle-mounted generator 1 is provided on the disk wheel portion of the vehicle, the space for the vehicle-mounted generator 1 is limited. Further, as described above, in the conventional on-vehicle generator 1, as shown in FIG. 8, the pole tooth cores 4 a and 5 a around which the coils 6 and 7 are wound are directed outward with respect to the center position of the rotating member 2. It is formed to extend radially. For this reason, a dead space is generated at an outer peripheral position (a position indicated by an arrow A2 in FIG. 8) with respect to an inner peripheral position (a position indicated by an arrow A1 in FIG. 8) of each of the pole tooth cores 4a and 5a, and the number of coils is increased. Therefore, there has been a problem that it is difficult to increase the amount of power generated by the conventional on-vehicle generator 1.
[0011]
The present invention has been made in view of the above points, and an object of the present invention is to provide an on-vehicle generator capable of increasing the amount of power generation while reducing the size.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is characterized by taking the following means.
[0013]
The invention according to claim 1 is
A rotating member that rotates integrally with the disk wheel with the rotation of the wheel,
A stationary member disposed coaxially with the rotating member and configured to maintain a stationary state regardless of the rotation of the rotating member;
A magnet disposed on one of the rotating member and the stationary member,
The rotating member or the stationary member is disposed on a member different from the member on which the magnet is disposed, and is configured by a plurality of coils configured to wind a winding around a core,
With the rotation of the rotating member, a vehicle-mounted power generator that generates power by the relative displacement of the magnet and the coil,
The center axis of the core is configured to be parallel to the rotation center axis of the rotating member.
[0014]
According to the above invention, since the center axis of the core is configured to be parallel to the rotation center axis of the rotating member, the coils can be densely arranged on the rotating member or the stationary member regardless of the inner and outer circumferences. Can be. This makes it possible to increase the amount of power generation while reducing the size of the vehicle-mounted power generation device.
[0015]
The invention according to claim 2 is
The on-vehicle power generator according to claim 1,
Among the rotating member or the stationary member, the member on which the coil is disposed is provided with a holder member having a coil housing portion for mounting the coil.
[0016]
According to the above invention, since the coil is held by the holder member having the coil housing, even if the coils are arranged at a high density, the arrangement position is defined by the coil housing. For this reason, even if the coils are arranged at high density, a short circuit does not occur between the adjacent coils, and the reliability of the vehicle-mounted power generator can be improved. In addition, since the coil mounting process is a process of merely mounting the coil in the coil housing portion, it is possible to facilitate the work of assembling the vehicle-mounted power generator.
[0017]
The invention according to claim 3 is:
The on-vehicle power generator according to claim 1 or 2,
The magnet is formed in an annular shape coaxial with a rotation center axis of the rotating member.
[0018]
According to the above invention, the thickness of the magnet in the rotation axis direction can be reduced, so that the onboard generator can be made thinner.
[0019]
The invention according to claim 4 is
The in-vehicle power generator according to any one of claims 1 to 3,
The magnet may be provided on the stationary member, and a plate-shaped weight may be provided for urging the stationary member to a stationary position regardless of the rotation of the rotating member.
[0020]
According to the above invention, since the coil that actually generates the electromotive force is provided on the rotating member, the electronic component disposed on the rotating side of the disk wheel or the like as compared with the configuration in which the coil is disposed on the stationary member. Can be easily supplied.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a vehicle-mounted generator 20 according to an embodiment of the present invention. FIG. 1 is a side sectional view of the vehicle-mounted generator 20, and FIG. 2 is an exploded side sectional view of the vehicle-mounted generator 20.
[0022]
The on-vehicle generator 20 is disposed, for example, on a disk wheel (not shown) of an automobile, and performs a power generation process as described later in detail. The on-vehicle generator 20 supplies power to an electronic device (for example, a display device using a light emitting diode) disposed on a disk wheel.
[0023]
As shown in FIGS. 1 and 2, the on-vehicle generator 20 is generally constituted by a rotating member 22 and a stationary member 23. The rotating member 22 is generally composed of a coil 24, a case 25, a coil holder 26, a cover 27, and the like. The stationary member 23 has a configuration in which annular magnets 28A to 28D and a weight 30 are provided.
[0024]
The case 25 is formed by resin molding, and has a bottomed cylindrical shape having a bottom plate 36 and a side wall 37. In the center of the case 25, a support shaft portion 38 is formed so as to protrude from the bottom plate 36 along a rotation center axis (a dashed line indicated by an arrow X in FIG. 2). A bearing 39 is mounted on the support shaft 38. The case 25 having the above configuration is fixed to the disc wheel 11 of the automobile.
[0025]
Specifically, the case 25 is provided with a mounting hole 57 (see FIG. 3), and a mounting bolt is inserted through the mounting hole 57 to fix the case 25 to the disk wheel. Thereby, the case 25 rotates integrally with the disc wheel (that is, integrally with the tire). However, the stationary member 23 remains stationary without rotating even when the disk wheel rotates, as will be described later.
[0026]
The coil holder 26 is formed by resin molding, and is fixed inside the case 25 described above. Specifically, a plurality of screw holes 34 are formed in the coil holder 26, and an insertion hole 33 is formed in the case 25. Therefore, the coil holder 26 is fixed to the case 25 by inserting the fixing screw 32 from the bottom plate 36 side of the case 25 into the insertion hole 33 and screwing it into the screw hole 34.
[0027]
The coil holder 26 has a plurality of coil housing portions 31 formed therein. The coil housing portions 31 are cylindrical concave portions, and the coils 24 are housed in the respective coil housing portions 31.
[0028]
FIG. 4 shows the coil 24 in an enlarged manner. The coil 24 includes a core 46, a bobbin 50, and a winding 52. The core 46 is made of a magnetic metal and has a core head 47 and a core body 48. The bobbin 50 is made of resin, and the winding 52 is wound around the bobbin 50. An insertion hole 51 is formed in the center of the bobbin 50, and the core body 48 of the core 46 is inserted and mounted in the insertion hole 51.
[0029]
The coil 24 is housed in each coil housing 31 formed in the coil holder 26 as described above. FIG. 22 shows a front view of the coil holder 26 in which the coil 24 is stored. As shown in the figure, in the present embodiment, the coils 24 can be arranged on the coil holder 26 at high density. For convenience of description, the high-density arrangement of the coils 24 will be described later in detail.
[0030]
The cover 27 is formed by resin molding and has a disk shape. In the center of the cover 27, a support shaft portion 40 is formed so as to stand up along a rotation center axis (a dashed line indicated by an arrow A in FIG. 2). A bearing 41 is provided on the support shaft portion 40.
[0031]
The support shaft 40 is joined to the support shaft 38 of the case 25 in an assembled state, and the outer periphery of the cover 27 is fixed to an end of the side wall 37 of the case 25. Then, the joined support shaft 38 and support shaft 40 cooperate to rotatably support the stationary member 23.
[0032]
At this time, the support shaft portions 38 and 40 that support the stationary member 23 have a bearing structure equivalent to a double-ended shaft. That is, the left end of the spindle 38 in the figure is fixed to the bottom plate 36, the right end of the spindle 40 in the figure is fixed to the cover 27, and the spindles 38 and 40 are integrally joined. The configuration is as follows.
[0033]
As a result, the stationary member 23 is rotatably supported by the double-supported spindle constituted by the spindle 38 and the spindle 40. With this configuration, it is possible to stabilize the rotation of the rotating member 22 about the support shafts 38 and 40 as compared with the case where the support shaft is in the shape of a support. In addition, since the distance between the annular magnets 28A to 28D described later and the coil 24 (the core head 47) can be kept constant, stable power generation can be performed.
[0034]
Next, the stationary member 23 will be described.
The stationary member 23 is a resin molded product, and has a configuration provided with the annular magnets 28A to 28D and the weight 30 as described above. A rotation shaft 43 is formed at the center thereof, and bearing mounting portions 44 and 45 for mounting the bearings 39 and 41 described above are formed at inner circumferential positions thereof.
[0035]
In this embodiment, four annular magnets 28A to 28D are provided. Each of the annular magnets 28A to 28D has a configuration in which N poles and S poles are alternately magnetized radially. The annular magnets 28A to 28D are fixed to magnet mounting grooves 42A to 42D formed in the stationary member 23 using an adhesive or the like. In the fixed state, the surface 23a of the stationary member 23 facing the coil holder 26 and the surfaces of the magnet mounting grooves 42A to 42D are configured to be flush.
[0036]
Further, each of the annular magnets 28A to 28D is configured to have a different diameter dimension about the rotation center X. FIG. 3 shows lines 28A-1 to 28D-1 (hereinafter, magnet center lines) indicating the center positions of the annular magnets 28A to 28D. As shown in the drawing, the annular magnet 28A has the largest diameter, and the annular magnets 28B, 28C, and 28D are sequentially reduced in diameter in this order.
[0037]
The coil 24 described above is disposed so as to be annular with respect to the center of the coil holder 26 (that is, the rotation center X). Then, in a state where the rotating member 22 and the stationary member 23 are assembled, each of the annular magnets 28A to 28D and the coil 24 provided in the coil holder 26 are configured to face each other. Therefore, when the rotating member 22 rotates with respect to the stationary member 23, a relative displacement occurs between the annular magnets 28A to 28D and the coil 24, whereby the coil 24 generates electric power due to a change in the magnetic field.
[0038]
In the present embodiment, since each of the annular magnets 28A to 28D has an annular shape coaxial with the rotation center X as described above, the thickness of the annular magnets 28A to 28D in the rotation axis direction (the arrow in FIG. 2). (The thickness indicated by W1) can be reduced. Therefore, according to the present embodiment, the thickness of the vehicle-mounted generator 20 can be reduced.
[0039]
The weight 30 is a plate-like member having a fan shape as shown in FIG. The weight 30 is disposed on a surface 23 b of the stationary member 23 facing the cover 27. Specifically, a fan-shaped weight mounting groove 58 is formed on the surface 23 b facing the cover 27, and the weight 30 is mounted in the weight mounting groove 58, and a screw (not shown) is mounted in the screw hole 53. It is fixed to the stationary member 23.
[0040]
In the present embodiment, a plate-shaped weight is also used as the weight 30, and the weight 30 is disposed on the surface 23b of the stationary member 23 opposite to the surface 23a on which the annular magnets 28A to 28D are disposed. are doing. Therefore, even if the thickness of the weight 30 (thickness indicated by the arrow W2 in FIG. 2) is reduced, the weight can be increased by increasing the area.
[0041]
The weight 30 is an important component for maintaining the stationary member 23 in a stationary state, and the greater the weight of the weight 30, the higher the stationary stability of the stationary member 23. For this reason, although it is desired to increase the weight of the weight 30, it is necessary to reduce the thickness of the vehicle-mounted generator 20. In this embodiment, this problem is solved by disposing the weight 30 on the surface 23b of the stationary member 23.
[0042]
That is, the surface 23b of the stationary member 23 has no other components, and therefore, the arrangement space in the direction along the surface 23b of the weight 30 has a degree of freedom. In other words, the area of the weight 30 can be freely increased. Therefore, it is possible to increase the weight of the weight 30 while keeping the thickness W2 of the weight 30 small. Therefore, according to the in-vehicle generator 20 according to the present embodiment, the stationary member 23 can be improved in the stationary stability while the thickness is reduced, and the power generation efficiency can be improved.
[0043]
Here, attention is paid to the arrangement of the coil 24. As described above, the coil 24 is housed in each of the coil housing portions 31 formed in the coil holder 26. FIG. 22 shows a front view of the coil holder 26 in which the coil 24 is stored. As shown in the figure, in the present embodiment, the coils 24 can be arranged on the coil holder 26 at high density.
[0044]
This is because, when the coil 24 is disposed on the coil holder 26, the center axis of the core 46 constituting the coil 24 is configured to be parallel to the rotation center X of the rotating member 22. In other words, (in the figure, X ₀ one-dot chain line indicated by) the center axis of the core 46 by the configured so as to be parallel to the rotation center X of the rotation member 22, regardless of the inner and outer circumferential sides, the coil 24 The coil holder 26 (rotating member 22) can be arranged at high density. This makes it possible to increase the amount of power generation while reducing the size of the vehicle-mounted power generation device 10.
[0045]
In addition, as described above, in the present embodiment, the coil 24 is held in the coil housing portion 31 formed in the coil holder 26. 31. For this reason, even if the coils 24 are arranged at a high density, a short circuit does not occur between the adjacent coils 24, and the reliability of the vehicle-mounted power generator 20 can be improved. In addition, the mounting process of the coil 24 is a process of merely mounting the coil 24 in the coil housing portion 31, so that the assembling work of the vehicle-mounted power generator 10 can be facilitated.
[0046]
Further, in this embodiment, since the coil 24 for generating the electromotive force is provided on the rotating member 22, compared to the configuration in which the coil 24 is provided on the stationary member 23, the electronic device provided on the rotating side of the disk wheel or the like is provided. Power can be easily supplied to the components.
[0047]
In the above-described embodiment, the coil 24 is provided on the rotating member 22 and the annular magnets 28A to 28D are provided on the stationary member 23. However, the coil 24 is provided on the stationary member 23, and the annular magnet 28 is provided. Even when 28A to 28D are arranged on the rotating member 22, the coil 24 can be arranged with high density, and the power generation amount can be increased while the size of the vehicle-mounted power generator 10 is reduced.
[0048]
【The invention's effect】
As described above, according to the present invention, the following various effects can be realized.
[0049]
According to the first aspect of the present invention, the coils can be arranged on the rotating member or the stationary member at high density regardless of the inner peripheral side and the outer peripheral side. The amount of power generation can be increased.
[0050]
According to the second aspect of the present invention, even if the coils are arranged at a high density, a short circuit does not occur between the adjacent coils, and the reliability of the vehicle-mounted power generator can be improved. it can. In addition, since the coil mounting process is a process of merely mounting the coil in the coil housing portion, it is possible to facilitate the work of assembling the vehicle-mounted power generator.
[0051]
According to the third aspect of the present invention, the thickness of the magnet in the direction of the rotation axis can be reduced, so that the onboard generator can be reduced in thickness.
[0052]
According to the fourth aspect of the present invention, since a coil that actually generates an electromotive force is provided on the rotating member, the coil is disposed on the rotating side of the disk wheel or the like as compared with a configuration in which the coil is provided on the stationary member. Power can be easily supplied to the disposed electronic components.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a vehicle-mounted generator according to an embodiment of the present invention.
FIG. 2 is an exploded sectional view of a vehicle-mounted generator according to an embodiment of the present invention.
FIG. 3 is a view of a fixing member provided in the vehicle-mounted generator according to one embodiment of the present invention, as viewed from a side facing a coil.
FIG. 4 is an exploded perspective view of a coil provided in a vehicle-mounted generator according to an embodiment of the present invention.
FIG. 5 is an enlarged view showing a weight provided in the vehicle-mounted generator according to one embodiment of the present invention.
FIG. 6 is a cross-sectional view showing an on-vehicle generator as an example of the related art.
FIG. 7 is an exploded cross-sectional view of a vehicle-mounted generator as an example of the related art.
FIG. 8 is a view of a stationary member provided in a vehicle-mounted generator as an example of the related art, viewed from a side facing a coil.
[Explanation of symbols]
Reference Signs List 20 onboard generator 22 rotating member 23 stationary member 24 coil 25 case 26 coil holder 27 cover 28A to 28D annular magnet 30 weight 31 coil housing 38, 40 support shaft 39, 41 bearing 42A to 42D magnet mounting groove 43 rotation shaft Part 46 core 47 core head 48 core body part 50 bobbin 51 insertion hole 52 winding

Claims (4)

A rotating member that rotates integrally with the disk wheel with the rotation of the wheel,
A stationary member disposed coaxially with the rotating member and configured to maintain a stationary state regardless of the rotation of the rotating member;
A magnet disposed on one of the rotating member and the stationary member,
The rotating member or the stationary member is disposed on a member different from the member on which the magnet is disposed, and is configured by a plurality of coils configured to wind a winding around a core,
With the rotation of the rotating member, a vehicle-mounted power generator that generates power by the relative displacement of the magnet and the coil,
A vehicle-mounted power generator, wherein a center axis of the core is configured to be parallel to a rotation center axis of the rotating member. The on-vehicle power generator according to claim 1,
The vehicle-mounted power generator according to claim 1, wherein, among the rotating member or the stationary member, the member on which the coil is provided includes a holder member having a coil housing for mounting the coil. The on-vehicle power generator according to claim 1 or 2,
The on-vehicle power generation device, wherein the magnet has an annular shape coaxial with a rotation center axis of the rotating member. The in-vehicle power generator according to any one of claims 1 to 3,
An on-vehicle power generator, wherein the magnet is disposed on the stationary member, and a plate-shaped weight is provided for urging the stationary member to a stationary position regardless of rotation of the rotating member.

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