JPH0710057A - Hub generator for bicycle - Google Patents

Abstract

PURPOSE:To improve durability by absorbing vibration or abnormal sound as well as to eliminate blinking of a lamp in the low speed traveling of a hub generator for a bicycle. CONSTITUTION:In a hub housed generator, rings 20, 21 divided into right and left parts are provided on the inner periphery of a fixed cylinder body 7 fixed to an axle 2 so as to be rotated together with the fixed cylinder body 7. A planetary roller 24 to be joined on the inner peripheral surfaces of these rings 20, 21 and also to be joined to a sun roller 15 integrally formed together with a rotor 16 is pivotally supported to a carrier 5 integrated with a hub body 4. A ring-like damper 27 made of elastic material is interposed between the pivotal supporting shaft 25 of this planetary roller 24 and the planetary roller 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generator built in a bicycle hub.

[0002]

2. Description of the Related Art The applicant of the present invention has previously filed Japanese Patent Application Laid-Open No. 3-16708.
No. 3 and JP-A-5-50961 have been filed. In all of these inventions, 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 on the axle inside the hub body. , A planetary transmission in which a generator coil body is fixedly provided in the fixed cylinder body, and a rotor integrally formed with a magnet is rotatably provided on the axle to accelerate the rotation of the hub body and transmit it to the rotor. The present invention relates to a power generator with a built-in hub.

In addition to the above-mentioned device, a large amount of magnets and coils having a relatively strong magnetic force are used without using the speed increasing mechanism described above, and the magnets are rotated at the same rotation speed as the wheels to generate electric power. There is also a generator with a built-in hub.

[0004]

The conventional device as described above has the following problems. That is, in a speed increasing type hub built-in generator that uses a magnet with a weak magnetic force and rotates it at a high speed, the number of magnetic poles per one wheel rotation is greater than in the non-speed increasing type, so the rotation is smooth and low speed running is achieved. Although there is no blinking of the lamp at the time, for example, the speed increasing ratio of the above-mentioned conventional example is about 25 times, and since the speed increasing ratio is large,
The structure became complicated and the cost increased.

In addition, a non-acceleration type internal hub built-in generator that uses a relatively large number of magnets and coils more than the acceleration type and rotates the magnets at the same number of rotations as the wheels to generate electric power has a number of effectively arranged magnetic poles. Since the power generation frequency is low during low-speed driving, the lamp will blink. Further, the cogging torque due to the attractive force and the repulsive force between the magnetic pole and the yoke is increased, causing chattering in the steering wheel and the like, which gives an unpleasant sensation during traveling. There is also a method of reducing the cogging torque by skewing the magnetization of the magnets or making the intervals between the protruding pieces of the yokes unequal. However, in this way, the amount of power generation per unit volume of the magnets is reduced. As a result, the size of the generator becomes large and it becomes heavy.

[0006]

In order to solve the above 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, and a generator coil is fixedly provided in the fixed cylinder, and a rotor integrally formed with a magnet is rotatably provided on the axle. A ring is provided on the inner circumference of the fixed cylindrical body so as to rotate together with the fixed cylindrical body, and a planetary roller that is joined to the inner circumferential surface of the ring and is joined to a sun roller integrally formed with the rotor is provided on the hub. A bicycle hub power generator is constructed by pivotally supporting the carrier integrated with the body, and interposing a ring-shaped damper made of an elastic body between the pivotal shaft of the planetary roller and the planetary roller.

[0007]

As described above, since the device of the present invention has the speed increasing device, the number of magnetic poles per one rotation of the wheel increases, and the blinking of the lamp during low speed running is eliminated. In addition, since there is a ring-shaped damper made of an elastic body between the shaft that pivotally supports the planetary roller and the planetary roller, the elastic body absorbs the effect of cogging torque and the discomfort caused by vibration or abnormal noise occurs. It can be resolved. An elastic damper interposed between the planetary roller and the shaft that pivotally supports the planetary roller reduces the impact load during rotation due to variations in the center position accuracy of the planetary roller and imbalance of the rotor. Since it absorbs, damage to the bearing surface can be prevented and durability can be improved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, 1 is a front hawk that is part of the frame of the bicycle,
Reference numeral 2 is an axle which is bridged between the ends of the left and right front forks 1 and fixed by nuts 3, respectively.

In the present embodiment, the hub body 4 of the front wheel is formed into a hollow cylindrical shape with one end (the right end in FIG. 1) opened, and the side cover body 5 is screwed to the open end of the ball bearing 6. It is rotatably provided on the axle 2 via. In addition, the diameter of the open end side of the hub body 4 is expanded to form a large diameter portion 4a.

Further, one end of the hollow cylindrical fixed cylinder 7 (see FIG. 1).
The left end) in FIG. 2 is fitted and fixed to the axle 2 via the sleeve 8, the other end (right end in FIG. 1) of this fixed cylinder 7 is opened, and the diameter on the open end side is expanded to increase the large diameter portion. 7a is formed.

An armature 10 having a coil 9 inside is inserted into the fixed cylindrical body 7 and fixed thereto. Reference numeral 11 is a lead wire which is connected to the armature 10 and is led to the outside through a groove provided in the sleeve 8, and 12 is a coil spring provided between the sleeve 8 and the fixed cylindrical body 7.

A shaft cylinder 14 is rotatably provided on the axle 2 via a bearing bush 13, and a sun roller 15 is formed at the right end of the shaft cylinder 14 in FIG. The rotor 16 made of a magnet is fixed.

Further, a ring holder 19 having a projecting edge 19a (see FIG. 2) protruding inward at the outer end of the thin-walled cylinder is inserted into the large-diameter portion 7a of the fixed barrel 7 to fix the fixed barrel 7.
Fixed to. Reference numeral 19b in FIG. 3 denotes semicircular recesses provided at four locations on the outer circumference of the ring holder 19, and reference numeral 7b denotes a protrusion of the fixed cylindrical body 7 that fits into the recesses 19b.

Inside the ring holder 19, a first ring 20 and a second ring 21 which are divided into left and right are provided, and inner peripheral surfaces 20a, 21a on the joint side of the left and right rings 20, 21 are provided.
(See FIG. 4) are respectively recessed so as to incline outward toward the joining side.

The first ring 20 and the second ring 21 are, as shown in FIGS.
The pin 22 driven from the outside of a is rotated together with the fixed cylindrical body 7 via the ring holder 19. In this case, it is preferable that the second ring 21 be slightly movable in the axial direction of the axle 2.

Reference numeral 23 designates the second ring 21 as the first ring 2
A disc spring for pushing to the 0 side, 17 for a spring bearing ring, and 18 for fixing the spring bearing ring 17 to a ring holder 19 are C-shaped fitted in an annular groove provided on the inner peripheral surface of the ring holder 19. It is a stop ring.

Further, 24 is a planetary roller (see FIG. 3) which is circumscribed into the sun roller 15 and inscribed in the inner circumferential surfaces of the first ring 20 and the second ring 21 at three equal positions on the circumference. 3), the side lid body 5 is used as a carrier and rotatably provided on the shaft 25 protruding from the side lid body 5.

In the present invention, the shaft hole of the planetary roller 24 is made particularly large, and bushes 26 having an L-shaped cross section are fitted from both sides of the shaft hole. A ring-shaped damper 27 made of an elastic material such as urethane S80A) is interposed.

The damper 27 shown in FIGS. 1, 2 and 5 has two semi-circular projections 27a arranged side by side on the outer circumference, and the damper 27 of FIG. 6 has an arcuate projection 27b on the inner circumference. 7 is an example in which the damper 27 in FIG. 7 has a large roundness (R) on both sides 27c of the outer peripheral surface.

Reference numeral 28 in FIG. 1 denotes a lock nut provided on the axle 2 so as to sandwich the front fork 1 with the nut 3, and 29 is provided between the ball bearing 6 of the side lid 5 and the axle 2. The flanged nut provided, 30 is the sleeve 8 and the lock nut 2
It is a washer provided between 8 and.

Next, the operation of the device of the present invention configured as described above will be described. When this bicycle runs, the hub body 4 integrally formed with the wheels rotates in the direction of arrow E in FIG. 3 together with the side lid body 5 and the shaft 25. In this case, since the fixed cylindrical body 7 is fixed, when the planet rollers 24 revolve in the direction of arrow E via the shaft 25, the planet rollers 24 rotate in the direction of arrow F accordingly.

By the revolution of the planetary roller 24 in the direction of arrow E and the rotation of the planetary roller in the direction of arrow F, the planetary roller 24 is rotated.
The sun roller 15 which comes into contact with and rolls rotates at an increased speed in the direction of arrow G in FIG. When the sun roller 15 rotates, the rotor 16 integrally joined to the sun roller 15 rotates at high speed in the armature 10, so that the generated electric current is taken out by the lead wire 11.

[0023]

As described above, since the device of the present invention has the speed increasing device, the number of magnetic poles per one rotation of the wheel increases and the blinking of the lamp during low speed running is eliminated. Further, since the elastic ring-shaped damper 27 is provided between the shaft 25 that pivotally supports the planetary roller 24 and the planetary roller 24, the elastic body absorbs the influence of the cogging torque, so that vibration or abnormal noise occurs. Discomfort caused by can be eliminated. Further, due to the elastic damper 27 interposed between the shaft 25 pivotally supporting the planetary roller 24 and the planetary roller 24, the impact of the planetary roller 24 at the time of rotation due to variations in the accuracy of the center position of the planetary roller 24 and imbalance of the rotating body, etc. Since the load is alleviated and absorbed, the bearing surface can be prevented from being damaged and the durability can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing the overall structure of a device of the present invention.

FIG. 2 is a partial detailed view of FIG.

FIG. 3 is a cross-sectional view taken along the line AA inside the fixed cylinder of FIG.

FIG. 4 is an enlarged sectional view taken along line BB of FIG.

FIG. 5 is an enlarged cross-sectional view showing an example of a damper.

FIG. 6 is an enlarged cross-sectional view of another embodiment of the damper.

FIG. 7 is an enlarged sectional view of another embodiment of the damper.

[Explanation of symbols]

 1 Front Hawk 2 Axle 3 Nut 4 Hub Body 5 Side Lid (Carrier) 6 Ball Bearing 7 Fixed Cylindrical Body 8 Sleeve 9 Coil 10 Armature 11 Lead Wire 12 Coil Spring 13 Bearing Bushing 14 Shaft Tube 15 Sun Roller 16 Rotor 17 Spring Bearing Ring 18 Stop Ring 19 Ring Holder 20 First Ring (Ring) 21 Second Ring (Ring) 22 Pin 23 Disc Spring 24 Planetary Roller 25 Shaft 26 Bushing 27 Damper 28 Lock Nut 29 Collar Nut 30 Washer

Claims (1)

[Claims] 1. 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 inside the hub body. While the generator coil body is fixedly provided in the fixed cylinder,
A rotor integrally formed with a magnet is rotatably provided on the axle, a ring is provided on an inner circumference of the fixed cylinder so as to rotate together with the fixed cylinder, and the ring is joined to an inner peripheral surface of the ring, A planetary roller, which is joined to the sun roller integrally formed with the rotor, is pivotally provided on the carrier integral with the hub body, and is made of an elastic body between the pivot shaft of the planetary roller and the planetary roller. A bicycle hub power generator characterized in that a ring-shaped damper is interposed.