JPH03258673A - Hub dynamo for bicycle - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency of a planet acceleration section by forming a peripheral directional orbit on the outer peripheral surface of each planet roller in a hub built-in type dynamo provided with at least one set of planet roller device and forming the orbit, which is fitted to the peripheral directional orbit, on the rolling surface of a sun roller and elastic ring. CONSTITUTION:The hub body 4 of the font wheel is formed into a stepped hollow cylindrical shape wherein one end is opened, and in which a stepped hollow cylindrical shape barrel 8 is contained, and is fittingly fixed to a axle 2. In this fixed barrel 8, an electricity generating coil body 20 is fixed and also a rotor 22 comprising a magnet 22a and a sun roller 22b which are formed into a body is rotatably provided to the axle 2. A planet roller 26 is supported by a planet carrier 23 having a sun roller 23a in a body, and the planet roller 24 engaged to the sun roller 23a is supported by side lid body 5. At this moment, each of the planet roller 24 and 26 makes the orbit composed of projected ribs which are formed on their outer peripheries to the orbit which is composed of ring-like grooves formed on the sun roller 22b and 23b and elastic ring 10 and 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power generation device built into a bicycle hub.

(Prior Art) Generally, an external type bicycle is often used in which a separate generator is attached to the body or front fork. This external generator is driven by pressing the rollers of the generator against the side surfaces or outer peripheries of the tires, and using the friction between the tires and the rollers, the rotation of the wheels is transmitted to the rollers.

In order for a generator to generate electricity, it is necessary for the rollers to rotate at high speed, but in external generators, a high speed increase ratio is obtained by rotating small diameter rollers with large diameter tires. However, in this case, the mechanical transmission efficiency is very low because it is a frictional transmission between the rubber of the tire and the metal roller, and is usually only about 50%. Furthermore, this transmission efficiency depends on the condition of the friction surface, such as water wetness or muddy dirt,
It is often greatly affected by contact conditions such as the generator's off-load condition and the degree of wheel vibration, and is often further reduced.

In addition, in the case of an external type, the generator is attached to the bicycle body or front fork as a separate unit, so a portion of the generator protrudes outside the bicycle. This protruding part easily comes into contact with people and objects, and becomes a hindrance when handling the bicycle. Also, if you fall over your bicycle and hit the protruding part of the generator against something, the generator installation will become distorted and you will have to adjust the installation position each time, making it very difficult. It was a hassle.

As described above, conventional external generators have many drawbacks, such as being inefficient, getting in the way, and requiring troublesome maintenance. Therefore, there has been a demand for the development of a small and lightweight bicycle power generation device that is efficient, does not get in the way.

In response to such requests, the present applicant previously filed Japanese Patent Application No. 1-2
Nos. 02915, 202916, and 202917 were filed.

The power generation device according to the present invention has a generator built into the hub of a bicycle wheel, and inside the hub, there is a power generation coil body fixed to the axle, and a rotor integrated with a magnet and rotatably provided on the axle. A planetary gear train is provided as a speed increasing device around the wheels, and power is generated by increasing the speed of the rotation of the wheels and transmitting the speed to the rotor.

In this power generator, the rotation of the wheels is transmitted to the rotor approximately 25 times due to the speed increasing action of the planetary gear train, so that the rotation speed of the rotor reaches approximately 4000 rpm during normal riding of the bicycle. When the rotor rotates at such high speed, a problem arises in that noise is generated from the gear meshing portion of the planetary gear train.

Additionally, when you suddenly start or stop your bicycle, the rotation speed of the rotor changes rapidly, and the inertial mass of the rotor applies a large load to the planetary gear system, which can damage the gears. Ta.

The present applicant has proposed Japanese Patent Application No. 1-275998 and Japanese Patent Application No. 1-30643 to further improve the above-mentioned power generation device.
I applied for No. 3. The power generating device according to this improvement uses a planetary roller train instead of the planetary gear train as the speed increasing device of the previously proposed power generating device. In this planetary roller array, the contact points of the sun roller, planetary roller, and elastic ring are brought into pressure contact, and rotation is transmitted by friction.

In other words, in such a planetary roller array, since the rotation is transmitted by the peripheral surface of the manual roller, no noise is generated even at high speed rotation. Furthermore, since it is a friction transmission, it was possible to prevent damage to parts by slinging it against excessive loads.

(Problem to be Solved by the Invention) However, in the power generation device using the planetary rollers described above, in the planetary speed increasing section, the planetary carrier and the rotor are connected to the axle, and each is rotatable with respect to the axle. Since the rolling surface of the planetary roller is flat, it may shift laterally in the axial direction during rotation, causing the side surfaces of parts such as the planetary carrier and rotor to come into contact with each other and slide. It sometimes rotated while moving. As a result, this sliding rotation resulted in friction loss, causing a decrease in the efficiency of the planetary speed increaser. In addition, there is a problem in that the sliding rotation causes the side surfaces of the parts to wear out, which adversely affects durability.

That is, although a planetary device using friction rollers should originally be extremely efficient, since it involved such sliding rotation, the transmission efficiency of the planetary speed increaser decreased and caused variations.

The present invention has been made to solve the above problems.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, a hub body of a wheel is rotatably fitted to an axle fixed to a frame of a bicycle, and the inside of this hub body is A hollow cylindrical fixed cylinder is fixed to the axle, a power generation coil body is fixed to the solid cylinder, and a rotor integrally formed with a magnet and a solar roller is mounted to the axle. A plurality of planetary rollers circumscribing the sun roller are rotatably mounted on a planetary carrier rotatably mounted on the axle, internal teeth are carved on the inner periphery of the fixed cylinder, and the outer periphery of the elastic ring is rotatably supported. The elastic ring is held by loosely fitting outer teeth carved into the inner teeth, and each of the planetary rollers is inscribed in this elastic ring, and the inner diameter of the elastic ring is set to the inscribed circle of each planetary roller. In a hub-built-in power generation device comprising at least one set of planetary roller devices, each of which is set to be slightly smaller than a diameter so that each of the planetary rollers comes into pressure contact with the elastic ring and the sun roller, the outer peripheral surface of each of the planetary rollers. A track consisting of circumferential protrusions or grooves is formed on the rolling surface of the sun roller and the elastic ring, and a track consisting of grooves or protrusions that engages with the said track is formed on the corresponding rolling peripheral surfaces of the sun roller and the elastic ring. to configure a bicycle hub power generation device.

Further, a bicycle hub power generating device is constructed by not providing a track on the circumferential surface of the planetary roller, but forming a track consisting of a groove that fits with the planetary roller on the rolling circumferential surface of the sun roller and the elastic ring. .

(Function) Since the present invention is configured as described above, the solar roller,
When the planetary roller and the elastic ring are assembled as a planetary speed increaser, the orbital part of the sun roller and the orbital part of the planetary roller fit together, and the orbital part of the planetary roller and the orbital part of the elastic ring fit together. Each part is aligned by a track. Even when the planetary roller array rotates, the sun roller, planetary roller, and elastic ring are always guided by the orbits, so each component does not shift laterally and move in the axial direction. Therefore, if a gap is set between the parts in advance, the parts will not come into contact with each other and slide and rotate.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a front fork that is part of the frame of the bicycle, and 2 is an axle extending between the ends of the left and right front forks 1 and fixed with nuts 3, respectively.

In this embodiment, the hub body 4 of the front wheel is shaped like a hollow cylinder with one end (the right end in FIG. 1) open, and the side cover body 5 is screwed to the open end, and the ball bearing 6 It is rotatably installed on the axle 2 via. Note that the diameter of the open end side of the hub body 4 is expanded to form a large diameter portion 4a. 7 are wheel spokes attached to the hub body 4, respectively.

One end (the right end in FIG. 1) of the hollow cylindrical fixed cylinder 8 is fitted to the axle 2 and fixed with a key 9,
The other end (the left end in FIG. 1) of the fixed cylinder 8 is opened, and the diameter of the open end side is expanded to form a large diameter part 8a, and internal teeth 8b are carved on the inner periphery thereof. .

On the outer periphery of the first elastic ring 10 and the second elastic ring 11, external teeth 10a having a slightly smaller pitch diameter than the internal teeth 8b,
lla is engraved. In addition, the first elastic ring 10 and the second
On the inner periphery of the elastic ring 11, there is a track lOb, 11 consisting of a groove with a concave cross-section, located almost in the center of the width of the ring and extending over the entire circumference.
b (see Figure 2).

Then, external teeth 10a, 11a are attached to the internal teeth 8b of the large diameter portion 8a.
are engaged in a clamped state (see Fig. 5.6), and the large diameter portion 8a
A first elastic ring 10 and a second elastic ring 11 are placed side by side on the inner periphery of the ring with a ring-shaped spacer 12 in between.

13 is a corner ring provided at the right corner of the second elastic ring 11 in FIG. 1, and 14 is a retaining ring.

Note that 2a is a stepped portion provided on the axle 2, 2b is a lead wire take-out groove that also serves as a keyway, 15 is a washer, and 16 is a spring.

Further, as shown in detail in FIG. 4, a coil 17 is formed by winding a conducting wire 17b in the groove of a grooved ring 17a, and then strip-shaped magnetic pole pieces 18a are attached to each of the positions where the outer periphery of the cylinder is divided into four. At the same time, these four magnetic pole pieces 18a are each connected to a small-diameter cylindrical portion 18b to form the first armature 18 integrally, and the cylindrical portion 18b of the first armature 18 is connected to the center of the coil 17. A cylindrical portion 1'9b that is pushed into the hole 17c and encloses the cylindrical portion 18b that protrudes from the center hole 17c, and the four magnetic pole pieces 1 when assembled.
Four strip-shaped magnetic pole pieces 1 each located in the middle of 8a.
9a to integrally form a second armature 19, and this second armature 19 is connected to the above-described coil 17 and first armature 18.
As shown in FIG. 3, the power generating coil body 20 is integrally constructed. Note that 21 is a lead wire drawn out from the coil 18.

Then, as shown in FIG. 8C and the keyway 2b.

Further, the rotor 22, which is integrally formed by combining the magnet 22a and the second sun roller 22b, is rotated with respect to the axle shaft 2 such that the magnet 22a corresponds to each of the magnetic pole pieces 18a and 19a of the generating coil body 20. Set it up freely.

In addition, the first sun roller 23a and the disk-shaped planetary carrier 2
3 is integrally formed, and this planet carrier 23 is provided rotatably with respect to the axle shaft 2 between the rotor 22 and the side cover body 5 of the hub body 4, and the planet carrier 23 is provided on the outer periphery of the first sun roller 23a. Three first planetary rollers 24 (see FIG. 5) are provided on the side cover body 5 of the hub body 4 by being pivotally supported by shafts 25, respectively.

Further, three second planetary rollers 26 (see FIG. 6) are installed on the outer periphery of the second sun roller 22b on the planetary carrier 23.
They are respectively pivotally supported by shafts 27.

The diameter of the inner peripheral surface of the first elastic ring 10 described above is
Each of the first planetary rollers 24 has a shape slightly smaller than the diameter of the inscribed circle, and the first elastic ring 10 with this small inner diameter is press-fitted to the outside of each of the first sun rollers 24, and the first planetary rollers 24 are 1 to be in pressure contact with the sun roller 23a.

Similarly, the diameter of the inner peripheral surface of the second elastic ring 11 described above is
Each of the first sun rollers 26 has a shape slightly smaller than the diameter of the circle inscribed therein, and the second elastic ring 11 having a smaller inner diameter is press-fitted to the outside of each of the second planetary rollers 26, so that the second planetary rollers 26 are 2 to be in pressure contact with the sun roller 22b.

Although the above structure is the same as that of Japanese Patent Application No. 1-306433 mentioned above, the following structure is added in the present invention.

That is, FIGS. 1 and 2 show a first embodiment of the present invention. In this case, a track 24a consisting of a rectangular protrusion in the circumferential direction is provided on the outer circumferential surface of the first planetary roller 24, and the second planetary A track 26a consisting of a rectangular protrusion in the circumferential direction is also provided on the outer peripheral surface of the roller 26 in a protruding manner.

And a raceway 10b made of a square groove that fits into the raceway 24a.
is provided on the inner peripheral surface of the first elastic ring 10, and the track 2
A track 23b made of a square groove that fits into the first sun roller 23a is provided on the outer peripheral surface of the first sun roller 23a.

Further, a track 11b made of a square groove that fits with the track 26a on the outer circumferential surface of the second planetary roller 26 is provided on the inner circumferential surface of the second elastic ring 11, and a track 22c made of a square groove that fits with the track 26a is provided on the inner circumferential surface of the second elastic ring 11. 2 provided on the outer peripheral surface of the sun roller 22b.

FIG. 7 shows a second embodiment of the present invention, in which tracks 24a are provided on the outer peripheral surface of each planetary roller 24,26.
, 26a are shaped into square grooves, and these tracks 24a.

26a and the tracks 10b, llb, 2 respectively mated with
3b and 22c are formed into square protrusions.

FIG. 8 shows a third embodiment of the present invention, in which a track 2 provided on the outer peripheral surface of each planetary roller 24, 26 is shown.
4a, 26a are formed into triangular protrusions, and the tracks IQb, l fit into these tracks 24a, 26a, respectively.
lb.

23b and 22c are shaped like triangular grooves.

FIG. 9 shows a fourth embodiment of the present invention, in which a track 2 provided on the outer peripheral surface of each planetary roller 24, 26 is shown.
4a, 26a are formed into semicircular protrusions, and tracks 10b, l fit into these tracks 24a, 26a, respectively.
lb.

23b and 22c are shaped like semicircular grooves.

Further, FIG. 1O shows an embodiment of the second invention of the present invention, and in this case, the first embodiment. No track is provided on the circumferential surface of the second planetary roller 24°26, and the first. second sun roller 23a,
22b and 1st. 3 4 of the second elastic ring 10.11 Raceway 10b, llb, 23b, 2 consisting of a concave groove that fits with the planetary roller 24.26 on the rolling peripheral surface
2c is formed.

Note that the first thing. The second elastic rings 1o, ii can be easily deformed because they are thin and made of spring steel or the like, although the unevenness of the tracks described above becomes an obstacle when press-fitting the second elastic rings 1o, ii. In addition, since there is a suitable clearance between the fitting parts of the planetary rollers 24 and 26 and the shafts 25 and 27 that pivotally support them, each planetary roller 24 and 26 can expand in the outer circumferential direction, making it easy to assemble. There is no problem.

Also, even after assembly, the first. Second elastic ring 10
．． 11 is slightly deformed into a triangular shape, but this deflection can be absorbed by the gap between the internal teeth 8b of the large diameter portion 8a and the external teeth LOa and lla.

Next, the operation of the apparatus of the present invention constructed as described above will be explained.

When the bicycle runs, the hub body 4, which is integrally formed with the wheel, rotates together with the side cover body 5 and the shaft 25 in the direction of arrow A in FIG. In this case, since the fixed cylinder 8 is fixed, when the first planetary rollers 24 revolve in the direction of arrow A via the shaft 25, each of the first planetary rollers 24 rotates in the direction of arrow B. . Due to the revolution of the first planetary roller 24 in the direction of the arrow and the rotation of the first planetary roller 24 in the direction of the arrow B, the first planetary roller 24 that rolls in contact with the first planetary roller 24
The sun roller 23a rotates at increased speed in the direction of arrow C in FIG.

In this embodiment, the inner diameter of the first elastic ring 10 of the fixed cylinder 8 is 64 mm, and the outer diameter of the first sun roller 23a is 1.
6 mm, the rotation of the planetary carrier 23 integrated with the first sun roller 23a is (64, +16)÷16=5
Therefore, the rotation speed of the hub body 4 is increased five times.

Also, the planetary carrier 23 integrated with the first sun roller 23a
rotates in the direction of arrow C, axis 2 rotates as shown in Figure 6.
7 also rotates in the direction of arrow C, so the second planetary roller 2
6 revolves in the direction of arrow C and rotates in the direction of arrow C. Therefore, the second sun roller 22b that rolls in contact with the second sun roller 22b rotates at an increased speed in the direction of arrow E.

In this embodiment, the inner diameter of the second elastic ring 11 of the fixed cylinder 8 is 64 mm, and the outer diameter of the second sun roller 22b is 1
Since there are six rotors, the rotation of the rotor 22 integrated with the second sun roller 22b is (64+16)÷16-5, so the rotation speed is increased five times that of the planetary carrier 23.

That is, the increased rotation speed of (5X 5 ) =254@ is obtained by the first stage planetary roller row and the second stage planetary roller row.

In this embodiment, two rows of planetary roller rows have been described, but the present invention can also be applied to the case of one row or three rows of planetary rollers.

Furthermore, in the present invention, tracks are formed that fit into the contact surfaces between each elastic ring 10.11 and each planetary roller 24.26, and the contact surfaces between each planetary roller 24.26 and each sun roller 23a, 22b. Therefore, each of the above parts is aligned by the orbit. Therefore, when the planetary roller array rotates, the sun roller, planetary roller, and elastic ring are always guided by the orbits, so that each component does not shift laterally and move in the axial direction. For this reason, if a gap is set between the pre-tightened parts, the parts will not come into contact with each other and slide and rotate.

(Effects of the Invention) Since the device of the present invention is configured as described above, in the planetary roller device, the contact portions between the sun roller and the planetary roller, and between the planetary roller and the elastic ring are always in a pressure contact state.

When such a planetary roller device is operated, a frictional force is generated at each contact portion, and the sun roller, planetary roller, and elastic ring can each be transmitted by the frictional force.

That is, in the device of the present invention, the planetary roller row acts as a speed-up transmission device similar to the planetary tooth row, and it is possible to generate electricity equivalent to the conventional device.

In addition, the sun roller, planetary roller, and elastic ring of the device of the present invention are always in close contact, and each roller has a smooth circumferential surface that transmits rotation, so even at high speeds, noise will not be generated from the contact parts. Even if you generate electricity while riding a bicycle at high speed, you can still get a quiet 78 revolutions.

In addition, if the frictional force generated by the pressure contact of the rollers is set in advance to 3 to 4 times the torque required for power generation, the contact surface of the rollers will slip when more torque is applied, causing stress on each part of the device. This eliminates the application of excessive force, and prevents excessive loads from being applied to the speed increaser due to sudden starts and stops of the bicycle. Therefore, there is no chance of parts being damaged.

Furthermore, in the present invention, the sun roller, planetary roller, and elastic ring are always guided by the orbit, so the parts do not slide and rotate against each other, improving the mechanical transmission efficiency of the planetary speed increaser and improving the durability of the parts. Sexuality also improves.

As described above, according to the present invention, it is possible to provide a bicycle power generation device that is small and lightweight, does not get in the way of handling, and is highly efficient while having power generation performance equivalent to that of a conventional exterior power generator. This effect can be obtained.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the device of the present invention, Fig. 2 is an enlarged view of the main parts of the device of the present invention, Fig. 3 is a perspective view of the generating coil body, Fig. 4 is an exploded perspective view of the generating coil body, and Fig. 5 The figure is an explanatory diagram of the action of the first stage planetary roller row, Fig. 6 is an action explanatory diagram of the second stage planetary roller row, and Figs.
FIG. 0 is an enlarged view of main parts showing another embodiment corresponding to FIG. 2. 1... Front fork 2... Axle 4... Hub body 5... Side cover body 8... Fixed cylinder body
8b... Internal tooth 10... First elastic ring
10a... External tooth lOb... Orbit
11... Second elastic ring 11a... External teeth
11b... Orbit 17... Coil
18...First armature 19...Second armature
20...Generating coil body 22...Rotor
22a... Magnet 22b... Second sun roller 2
2c... Orbit 23... Planet carrier 23a... First sun roller 24... First planet roller 25... Axis 26a... Orbit 23b... Orbit 24a... Orbit 26...・Second planetary roller 27...shaft

Claims (1)

[Claims] 1. A hub body of a wheel is rotatably fitted to an axle fixed to a frame of a bicycle, and a hollow cylindrical fixed cylinder is fixed to the axle inside the hub body. A power generation coil body is fixedly provided in the solid cylinder, a rotor integrally formed with a magnet and a sun roller is rotatably provided on the axle, and a plurality of planetary rollers circumscribing the sun roller are provided. The ring is pivotally supported on a planetary carrier rotatably provided on the axle, internal teeth are carved on the inner periphery of the fixed cylindrical body, and external teeth carved on the outer periphery of the elastic ring are loosely fitted into the internal teeth. By holding an elastic ring, inscribing each of the planetary rollers in this elastic ring, and setting the inner diameter of the elastic ring to be slightly smaller than the inscribed circle diameter of each planetary roller, each of the planetary rollers In a hub built-in power generation device comprising at least one set of planetary roller devices that are in pressure contact with a ring and a sun roller, respectively, a track consisting of a circumferential protrusion or groove is formed on the outer peripheral surface of each of the planetary rollers, A bicycle hub power generating device characterized in that a track consisting of a groove or a protrusion that fits into the track is formed on the rolling peripheral surface of the sun roller and the elastic ring corresponding thereto. 2. A track is not provided on the circumferential surface of the planetary roller according to claim 1, but a track consisting of a groove that fits with the planetary roller is formed on the rolling circumferential surface of the sun roller and the elastic ring. Bicycle hub generator.