JPH0688545B2 - Bicycle generator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a power generator built into a bicycle hub.

(Prior Art) In general, as a bicycle power generator, an exterior type in which a generator separate from a bicycle body is attached to the bicycle body is often used.

This external generator drives the generator by pressing the roller of the generator against the side surface or the outer periphery of the tire and frictionally transmitting from the tire to the roller of the generator.

However, in this type of generator, the mechanical conduction efficiency of frictional conduction was poor, and although the amount of power generation was small, the rotational load of the pedal was felt quite heavy.

The efficiency of the generator is greatly affected by the accuracy of mounting the generator on the vehicle body, the deflection of the wheels, and the like.

Also, because it is frictionally conductive, when the tire gets wet,
As a result of the friction coefficient remarkably lowering and slipping, efficiency may be further deteriorated and power generation may not be possible.

In addition, there is a drawback that only the contact surface of the tire with the roller is partially worn.

In order to eliminate these drawbacks, the techniques disclosed in Japanese Utility Model Publication No. 58-188385 and Japanese Utility Model Publication No. 57-12384 have been devised.

(Problems to be Solved by the Invention) In an induction generator using a coil and a permanent magnet, the electromotive force thereof is generated in proportion to (number of coil turns × flux density × rotational peripheral velocity).

In the conventional exterior type, by rotating a roller (diameter 20 mm) with a tire (diameter 660 mm), the rotor speed is increased to approximately 33 times the wheel rotation, thereby increasing the peripheral speed of the rotor. .

Also, since the number of poles of this type of generator is usually eight,
The number of poles when the wheel makes one rotation is about 264 poles (8 poles x 33), so smooth rotation with almost no pulsation is obtained.

However, in the case where the generator is a hub built-in type as in the above-mentioned conventional technique, the rotation of the rotor is the same as the rotation of the wheels, and the peripheral speed of the rotor is significantly reduced as compared with the case of the exterior type. .

That is, in order to obtain an electromotive force equivalent to that of the external generator, it is necessary that the value of (coil winding number × magnetic flux density × rotational peripheral speed) be equal to that of the external generator.

For this reason, in the above-mentioned Japanese Utility Model No. 58-188385, the outer diameter of the rotor is increased, but since a sufficient peripheral speed cannot be obtained, the magnet is strengthened and the number of turns of the coil is further increased. The same electromotive force is finally obtained by increasing.

However, even though the outer diameter is increased, the maximum number of magnets that can be arranged on the circumference is 24 to 36, which is significantly smaller than the conventional 264 poles, which causes pulsation in rotation. There is a problem that it occurs.

Further, in the above-mentioned Japanese Utility Model Laid-Open No. 57-12384, the rotation of the hub is accelerated by the planetary gear mechanism, but in the case of a single-stage planetary gear train, there is a limit of about 5 times in practical use. Therefore, in this case as well, a sufficient peripheral speed of the rotor cannot be obtained, so by increasing the outer diameter of the rotor, strengthening the magnet, and increasing the number of coil turns,
It is necessary to obtain the same electromotive force as the external generator.

Further, since the coil of the above-mentioned conventional device has a cylindrical shape arranged on the circumference, the maximum number is about six.

That is, since the number of poles for one rotation of the wheel in this case is about 30 poles (6 poles × 5), it is conceivable that pulsation occurs in the rotation as in the previous example.

Therefore, both of the above-mentioned two prior arts require a large-diameter rotor and cannot be made compact.

Moreover, since the number of poles for one rotation of the wheel is not sufficient, there is a problem that smooth rotation cannot be obtained.

(Means for Solving the Problem) 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 hub body is provided inside the hub body. A hollow cylindrical fixed cylinder is fixedly provided on the axle, a power generation coil is fixedly provided in the fixed cylinder, and a rotor integrally formed with a magnet and a second sun gear is rotatable. A second sun wheel provided integrally with the first sun gear on the outer axle of the rotor.
A planetary carrier is rotatably provided, an internal gear is formed on an inner peripheral portion of the hub body, and a first planetary gear that meshes with the internal gear and the first sun gear is fixed to the axle. A bicycle power generator is constructed by pivotally supporting a planet carrier and pivoting a second planet gear that meshes with the internal gear and the second sun gear to the second planet carrier.

As a second invention, a hub body of a wheel is rotatably fitted to an axle fixed to a bicycle frame, and a hollow cylindrical fixed cylinder is fixedly provided on the axle inside the hub body. A generator coil is fixedly provided in the fixed cylinder, and a rotor integrally formed with a magnet and a third sun gear is rotatably provided, and an axle on the outer side of the rotor is integrated with the second sun gear. Rotatably provided with a third planetary carrier formed integrally, rotatably provided with a second planetary carrier integrally formed with the first sun gear on the outside thereof, and further with the first planetary carrier fixed to the axle on the outside thereof. And an internal gear is formed on an inner peripheral portion of the hub body, and a first planetary gear that meshes with the internal gear and the first sun gear is pivotally supported on the first planet carrier. Together with the internal gear and the second sun tooth And a second planetary gear that meshes with the second planetary carrier, and a third planetary gear that meshes with the internal gear and the third sun gear is pivotally supported on the third planetary carrier. And construct a bicycle generator.

(Operation) Since the device of the present invention is configured as described above, the first aspect of the present invention will be as follows. First, the internal gear formed on the hub body, the first planetary gear of the first planetary carrier, and the first planetary gear of the second planetary carrier will be described. By the first stage planetary gear train composed of one sun gear, the rotation speed of the hub body is increased and transmitted to the second planet carrier, and further, the internal gear of the hub body and the second planet carrier are pivoted. The rotation of the second planet carrier is further accelerated and transmitted to the rotor by the second planetary gear train composed of the supported second planetary gear and the second sun gear integrated with the rotor.

That is, in the first aspect of the present invention, the peripheral speed of the rotor equivalent to that of the exterior type can be obtained by increasing the speed by the two-stage planetary gear train.

Further, the second aspect of the present invention is the device of the first aspect in which a planetary gear train for speed-up at the third stage is further added. Therefore, even if the outer diameter of the hub body is smaller than that of the first aspect, The peripheral speed of the rotor equivalent to that of the exterior type can be obtained.

Therefore, according to the present invention, it is possible to generate an electromotive force equivalent to that of the exterior type without strengthening the magnet, increasing the number of turns of the power generation coil, and increasing the outer diameter of the rotor. .

Also, since the number of poles for one rotation of the wheel is almost the same as the exterior type,
Smooth rotation with almost no pulsation can be obtained.

(Example) Hereinafter, the Example of this invention is described about drawing. 1 in the figure
Is a front hawk which is a part of a bicycle frame, and 2 is an axle which is hung across the ends of the left and right front forks 1 and fixed by nuts 3, respectively.

1 to 5 show an embodiment of the first invention,
In the present embodiment, the hub body 4 of the front wheel is formed into a hollow cylindrical shape with one end (the left end in FIG. 1) opened, and the side cover body 5 is screwed to the open end and the side bearing body 5 is inserted through the ball bearing 6. Rotatably mounted on the axle 2. The diameter of the hub body 4 on the open end side is expanded to form a large diameter portion 4a. 7 is this hub body 4
Wheel spokes attached to each.

Further, one end of the hollow cylindrical body (the left end in FIG. 1)
Is opened, and the other end (the right end in FIG. 1) is fitted with the axle 2 to integrally form a fixed cylinder body 8. The fixed cylinder body 8 is fixed to the small diameter portion 4b of the hub body 4. It is loosely fitted so as to have a slight gap inside and is fixed to the axle 2 via the key 9.

Reference numeral 2a is a stepped portion provided on the axle 2, 2b is a lead wire take-out groove that also serves as a key groove, 10 is a washer, and 11 is a spring.

As shown in detail in FIG. 3, a coil 12 is formed by winding a conducting wire 12b in the groove of a grooved ring 12a, and then a strip-shaped magnetic pole piece 13 is formed at each of four positions on the outer circumference of the cylinder.
a is arranged, and these four magnetic pole pieces 13a are respectively connected to the cylindrical portion 13b having a small diameter to integrally form the first armature 13, and the cylindrical portion 13b of the first armature 13 is connected to the coil 12 A cylindrical portion 14a which is inserted into the central hole 12c of the above and encloses a cylindrical portion 13b protruding from the central hole 12c, and four strip-shaped magnetic poles which are respectively located between the four magnetic pole pieces 13a during assembly. As shown in FIG. 2, the second armature 14 is integrally formed by connecting with the piece 14b, and the second armature 14 is fitted to the above-mentioned combined body of the coil 12 and the first armature 13. As a generator coil body 15
Are integrally configured. Reference numeral 16 is a lead wire drawn from the coil 12.

Then, as shown in FIG. 1, the power generating coil body 15 configured as described above is inserted and fixed between the fixed tubular body 8 and the axle 2, and the lead wire 16 is provided in the fixed tubular body 8. 8c and groove
Take it out via 2b.

Further, the rotor 17 integrally formed by connecting the magnet 17a and the second sun gear 17b is rotated with respect to the axle 2 so that the magnet 17a corresponds to each magnetic pole piece 13a, 14b of the power generating coil body 15. Provide freely.

Further, the first sun gear 18a and the disk-shaped second planet carrier 18 are integrally formed, and the second planet carrier 18 is connected to the rotor.
17 is provided rotatably with respect to the axle 2 on the side lid body 5 side, and a first planetary carrier 19 is fixedly provided on the outer side of the axle 2 and fixed to the inner circumference of the large diameter portion 4a of the hub body 4. An internal gear 4c is formed, and three first planetary gears 20 (see FIG. 4) that mesh with the internal gear 4c and the first sun gear 18a are used as shafts.
The two second planetary gears 22 (see FIG. 5) are provided so as to be pivotally supported by the first planetary carrier 19 respectively, and are meshed with the internal gear 4c and the second sun gear 17b, respectively. The two planetary carriers 18 are pivotally supported by shafts 23 to form a bicycle generator.

6 to 9 show an embodiment of the second invention, and the same reference numerals as those used in the drawings denote the same components. First
Only the differences from the invention will be described below.

That is, the rotor 17 is formed by combining the magnet 17a and the third sun gear 17c, the second sun gear 24a is integrally formed with the third planet carrier 24, and the second planet gear 22 is formed by the shaft 23 to form the second It is pivotally supported on the planet carrier 18 and meshes with the internal gear 4c and the second sun gear 24a, and the internal gear 4c and the third sun gear 17c are newly added.
Three third planetary gears 25 (see FIG. 9) meshing with each other are provided on the third planetary carrier 24 by means of shafts 26, respectively. In this embodiment, since it is not necessary to provide the hub body 4 with a large diameter portion, the hub body 4 may have the same diameter over the entire length.

In other words, the second aspect of the present invention is a three-step planetary gear train in which the second speed increasing planetary gear train of the first aspect of the invention is further combined with another planetary gear train.

Next, the operation of the device of the present invention configured as described above will be described first with reference to the embodiment of the first invention.

When this bicycle runs, the hub body 4 formed integrally with the wheels rotates in the direction of arrow A in FIG. In this case, since the first planet carrier 19 is fixed, the first planet gear 20 does not revolve via the shaft 21. Hub body 4 in this state
Is rotated in the direction of arrow A, the speed of each first planetary gear 20 is increased in the direction of arrow B, and the first planetary gears 20 are rotated. This first
By the rotation of the planetary gear 20 in the direction of arrow B, the first sun gear 18a meshing with the first planetary gear 20 is further accelerated in the direction of arrow C in FIG.

In the present embodiment, since the number of teeth of the internal gear 4c of the hub body 4 is 72T and the number of teeth of the first sun gear 18a is 18T, the rotation of the second planet carrier 18 integrated with the first sun gear 18a. Is 72 ÷ 18
= 4, the motor rotates in the reverse direction at four times the rotation speed of the hub.

When the second planet carrier 18 integrated with the first sun gear 18a rotates in the direction of arrow C in FIG. 5, the shaft 23 also rotates in the direction of arrow C as shown in FIG. Planetary gear 22
Revolves in the direction of arrow C and rotates in the direction of arrow D. Therefore, the second sun gear 17b meshing with this rotates at an increased speed in the direction of arrow E.

Now, when the wheel, that is, the internal gear 4c of the hub body 4 makes one revolution in the positive direction, the second planet carrier 18 moves in the opposite direction by 4 revolutions.
Since they rotate, the relative rotation difference between the internal gear 4c of the hub body 4 and the second planet carrier 18 is 5 rotations.

In this embodiment, the number of teeth of the internal gear 4c of the hub body 4 is 72T, and the number of teeth of the second sun gear 17b is 18T. Therefore, the speed increasing ratio in this case is (72 + 18) ÷ 18 = 5. Therefore, the second sun gear 17b rotates 5 times with respect to the second planet carrier 18.

That is, the rotation of the rotor 17 is 5 with respect to the rotation of the hub body 4.
Since × 5 = 25, it means that the rotation is reversed 25 times.

Actually, since the entire wheel makes one revolution in the positive direction, the rotor 17 integrated with the second sun gear 17b has 25-1 = 24, and therefore rotates in reverse at 24 times the rotational speed. .

That is, in this device, a speed increasing ratio of 24 times can be obtained by the first stage planetary gear train and the second stage planetary gear train.

Next, the operation of the second invention will be described with reference to FIGS.

In the second invention, the planetary gear train of the first invention is further increased by one stage to three stages. Therefore, in order to obtain a speed increase rate similar to that of the first invention, The outer diameter can be reduced.

In this embodiment, the internal gear 4c is 48T, and each sun gear 18
Since each of a, 24a, and 17c is 24T, the first sun gear 18a is doubled in speed by 48 ÷ 24 = 2 by the first stage planetary gear train.

In addition, the second sun gear 24a is provided by the second stage planetary gear train.
Is {(48 + 24) ÷ 24} × 3-1 = 8, and therefore the speed is increased eight times.

Furthermore, the 3rd stage planetary gear train allows the third sun gear 17c
Is {(48 + 24) ÷ 24} × 9-1 = 26, so that a 26-fold speed-up rotation can be obtained.

(Effects of the Invention) As described above, according to the present invention, the rotor 17 provided in the hub body 4 of the bicycle is accelerated by the planetary gear train having two or three stages.
The rotor 17 has, for example, 27 times as many wheels as in the present embodiment or
By rotating at 26 times, it is possible to obtain a rotating peripheral speed almost equal to that of the exterior type.

That is, according to the present invention, it is possible to generate an electromotive force equivalent to that of the exterior type without strengthening the magnet 17a or increasing the number of windings of the magneto coil 12.

Therefore, it is possible to use a magnet and a generator coil of the same size as those of the exterior type, without requiring specially designed parts such as a conventional built-in hub type generator. Can have a small diameter.

Also, since the number of poles for one rotation of the wheel is almost the same as the exterior type,
Smooth rotation with almost no pulsation can be obtained.

Further, because of gear conduction, stable and high efficiency can be maintained without being affected by water wetting of the friction surface and mounting accuracy with respect to the wheels unlike the exterior type.

Therefore, according to the present invention, it is possible to provide an excellent effect that it is possible to provide a small-sized hub-embedded power generator that has power generation performance equivalent to that of the conventional one, is efficient, and has a good appearance.

[Brief description of drawings]

1 is a sectional view of a first embodiment of the device of the present invention, FIG. 2 is a perspective view of a power generating coil body, FIG. 3 is an exploded perspective view of the power generating coil body, and FIG. 4 is a first stage of the first embodiment. 5 is an explanatory view of the action of the second planetary gear train, FIG. 5 is an explanatory view of the action of the second stage planetary gear train of the first embodiment, FIG. 6 is a cross-sectional view of the second embodiment of the device of the present invention, and FIG. Is an explanatory view of the action of the first stage planetary gear train of the second embodiment, FIG. 8 is an explanatory diagram of the action of the second stage planetary gear train of the second embodiment, and FIG. 9 is a three stage of the second embodiment. It is an explanatory view of the action of the planetary gear train. 1 ... Front hawk, 2 ... Axle 4 ... Hub body, 4c ... Internal gear 5 ... Side lid body, 8 ... Fixed cylinder body 12 ... Coil, 13 ... First armature 14 ... Second armature, 15 ... Generator coil body 17 ... Rotor, 17a ... Magnet 17b ... Second sun gear, 17c ... Third sun gear 18 ... Second planet carrier, 18a ... First sun Gear 19 ... First planet carrier, 20 ... First planet gear 22 ... Second planet gear, 24 ... Third planet carrier 25 ... Third planet gear

Claims (2)

[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 fixedly provided inside the hub body. The generator coil body is fixedly provided in the fixed cylindrical body, and a rotor in which a magnet and a second sun gear are integrally formed is rotatably provided, and an outer shaft of the rotor is integrally formed with the first sun gear. A second planetary carrier formed rotatably, an internal gear is formed on an inner peripheral portion of the hub body, and a first planetary gear that meshes with the internal gear and the first sun gear is provided on the axle. And a second planetary gear that meshes with the internal gear and the second sun gear, respectively, and the second planetary gear is pivotally supported on the second planetary carrier. . 2. 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 fixedly provided inside the hub body. The generator coil body is fixedly provided in the fixed cylindrical body, and a rotor in which a magnet and a third sun gear are integrally formed is rotatably provided, and an outer shaft of the rotor is integrally formed with the second sun gear. The third planetary carrier formed on the first sun gear is rotatably provided, and the second planetary carrier integrally formed with the first sun gear is formed on the outer side thereof.
A planet carrier is rotatably provided, and a first carrier is provided outside the planet carrier.
A planet carrier is fixedly provided on the axle, an internal gear is formed on an inner peripheral portion of the hub body, and a first planet gear that meshes with the internal gear and the first sun gear is the first planet carrier. A second planetary gear that is pivotally supported on the second planetary carrier and that meshes with the internal gear and the second sun gear. A power generator for a bicycle, comprising: a third planetary gear, which meshes with each gear, pivotally supported on the third planetary carrier.