JPH0417431Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention relates to a hub with a built-in generator used for lighting bicycle lights.

(b) Conventional technology Conventionally, in a hub with a built-in generator for lighting a bicycle light, the inner side in the radial direction of the hub is It had a coil on the inside and a magnet on the outside, and the rotation of the magnet was increased by a planetary wheel to generate electricity.

(c) Problems to be solved by the invention In the hub as described above, the outer diameter becomes large because the coil and magnet are arranged in series in the radial direction. Furthermore, since the rotation of the magnet is increased by intervening the planetary wheel, there is a problem in that efficiency is low and the pedal feels extremely heavy during rapid acceleration.

(d) Means for solving the problem In order to solve the above-mentioned problem, this invention has a hub rotatably attached to the axle fixed to the bicycle frame, and a magnet attached to the center of the hub in the axial direction. A plate is provided, and at equal intervals on this magnet mounting plate,
Install the magnets with their polarities mutually arranged in the axial direction. A coil mounting plate is fixed to the axle with a gap left and right on the left and right sides of the magnet mounting plate in the axial direction, and the coils are mounted on the left and right coil mounting plates at the same pitch diameter and at the same distance, and are adjacent to each other at the same time. Two coils forming a magnetic circuit are installed on the left and right sides with a half-pitch phase shift of an interval l.

(E) Function Therefore, in the hub with a built-in generator for a bicycle of this invention, since the coils are provided on the left and right sides of the magnet, the magnetism of the magnet can be used effectively, and the total number of coil turns can be increased, and power can be generated efficiently. I can do it. Furthermore, by arranging the phases of the coils on the right and left sides of the magnet to be shifted by half a pitch l/2, the voltages generated in each of the left and right coils are generated with a phase difference of 90 degrees. Furthermore, since there is no contact drive unit such as a planetary wheel, and the rotation of the magnet is not accelerated, the pedal becomes lighter and at the same time speedy acceleration and deceleration can be achieved.

(F) Embodiment An embodiment of the bicycle hub with built-in generator of this invention will be described below in detail based on the drawings. 1 indicates the axle, which is fixed to the bicycle frame. A hub 5 consisting of a hub side plate 3 and a hub cylindrical portion 4 is rotatably attached to the axle 1 via a bearing 2. A magnet mounting plate 6 is fixed to the central portion of the hub 5 in the axial direction. Magnets 7 are fixed to the magnet mounting plate 6 at equal intervals with north and south poles arranged alternately in the axial direction.

On the other hand, a minimum gap is provided on the right and left sides of the magnet mounting plate 6 in the axial direction, and the coil mounting plate 8,
8' is fixed to the axle 1. Coils 10, 10' are attached to the left and right coil mounting plates 8, 8' by iron cores 9, 9'. These coils 10, 10' are arranged with the same pitch diameter and the same spacing as the magnet 7, and at the same time, two adjacent coils constitute a magnetic circuit by a connecting plate 11. Further, the right side coil 10 and the left side coil 10' are installed with their phases shifted by a half pitch l/2 of the installation interval l.

On the other hand, the coils 10 and 10' are electrically connected in series, and the generated electricity passes through the hole 12 in the axle and is supplied to the light 14 via the driver section 13, so that the light 14 lights up. The driver 13 mainly has the function of rectifying the voltage generated by the left and right coils and applying it to the light 14. This function will be explained with reference to FIG. In the figure, voltages a and b generated by the left and right coils have a phase difference of 90 degrees, and by rectifying each of them, they are applied to the light 14 as a full-wave rectified voltage c. Further, the driver section 13 is provided with a manual switch 15 and a light sensor 16, and the light 14 can be turned on arbitrarily by operating the manual switch 15 on 0N and 0FF, and at the same time, the light sensor 16 detects the brightness and turns on the light at night. can be turned on automatically.

(g) Effects of the invention In the bicycle hub with built-in generator of this invention, as described above, the coils 10 and 10' are provided on the left and right sides of the magnet 7 in the axial direction.
The magnetism of the magnet 7 can be used effectively, and the total number of turns is the sum of the left and right sides, which can be increased, making it possible to generate electricity extremely efficiently. Furthermore, by arranging the phases of the left coil 10 and the right coil 10' to be shifted by half the interval between the coils, the voltages generated in each of the left and right coils are generated with a phase difference of 90 degrees, Since this is rectified and combined, the voltage applied to the light 14 becomes a full-wave rectified waveform, which is averaged compared to when combined with one pitch l, making it easier to maintain a constant and stable force for rotating the pedal. Furthermore, since there is no contact drive unit such as a planetary wheel, and there is no need to increase the speed of the magnet's rotation, the pedal becomes lighter and can be quickly increased or decelerated.

Moreover, the lighting of the light 14 is done by the manual switch 15.
This can be done not only manually but also automatically using the optical sensor 16, so there is no need to worry about turning on the lights at night and it is safe.

[Brief explanation of drawings]

The figures show an embodiment of the hub with a built-in power generator for a bicycle according to the present invention. Figure 1 is an exploded perspective view, Figure 2 is a sectional view, Figure 3 is a magnetic circuit diagram, and Figure 4 is a light lighting circuit diagram. be. 1... Axle, 2... Bearing, 3... Hub side plate, 4... Hub cylindrical portion, 5... Hub, 6... Magnet mounting plate, 7... Magnet, 8, 8'...
Coil mounting plate, 9, 9'... Iron core, 10, 10'...
...Coil, 11...Connecting plate, 12...Hole, 13...
...Driver section, 14...Light, 15...Manual switch, 16...Light sensor, l...1 pitch,
a, b...Generated voltage waveform, c... Rectified voltage waveform.

Claims (1)

[Scope of utility model registration request] The magnets are provided at equal intervals on an axle fixed to the bicycle frame, a hub rotatably supported on the axle, and a magnet mounting plate provided in the center of the hub, and at the same time polarized in the axial direction. A plurality of magnets arranged alternately, a coil mounting plate fixed to the aforementioned axle so that the magnet mounting plate is narrowed from side to side, and a coil mounting plate fixed to the left and right coil mounting plates with the same pitch as the above-mentioned magnet with a phase difference of half a pitch on the left and right sides. What is claimed is: 1. A hub with a built-in generator for a bicycle, characterized in that the hub has a built-in coil that is attached at equal intervals in a circle, and two adjacent coils constitute a magnetic circuit.