JPH0550961A - Hub generator for bicycle - Google Patents

Abstract

PURPOSE:To facilitate the assembly of a hub generator by providing a plural number of slice shaped protruding portions for each outer circumference of plastic rings which are provided so that planet rollers are brought into contact with each sun roller with pressure, and thereby engaging these protruding portions with a plural number of protruding portions provided for the inner circumference of a stationary cylindrical body fixed onto an axle. CONSTITUTION:When a bicycle is running a hub body 4 integrated with a wheel is rotated together with a side cover body 5 and a shaft 25, a first planet roller 24 rotates on its own axis while being revolved in the same direction via the shaft 25. This constitution thereby allows a first sun roller 23a to be acceleratedly rotated together with a planet carrier 23, and also allows a second planet roller 26 supported by the carrier 23 to rotate on its own axis while being revolved. A second sun roller 22a therefore is also acceleratedly rotated, so that electric power is generated by a power generating coil body 20. In this case, a plural number of protruding portions are provided for the inner circumference of a stationary cylindrical body 8 fixed onto an axle 2, a plural number of slice shaped protruding portions provided for the outer circumferential sections of elastic rings which allow the planet rollers 24 and 26 to come in contact with the sun rollers 23a and 22b with pressure, is engaged with the aforesaid protruding portions, so that assembly can easily be processed.

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 application previously applied for Japanese Patent Application No. 1-306433 (Japanese Patent Application Laid-Open No. 3) (see FIGS. 9-11), and the wheels are attached to an axle 2 fixed to a bicycle frame. Hub body 4
Is rotatably fitted, a hollow cylindrical fixed cylinder 8 is fixedly provided to the axle 2 inside the hub body 4, and a power generating coil body 20 is fixedly provided in the fixed cylinder 8. ,magnet
A rotor 22 integrally formed with 22a is rotatably provided on the axle 2, and a hub built-in type power generator having a planetary transmission device that accelerates the rotation of the hub body 4 and transmits the rotation to the rotor 22 is provided.
A sun roller 22b integral with the magnet 22a rotatably provided on the axle 2, a plurality of planet rollers 26 arranged to circumscribe the sun roller 22b, and a planet carrier 23 pivotally supporting the planet rollers 26. And an outer ring 11a engraved on the outer periphery of the fixed cylindrical body 8 is loosely fitted to the outer tooth 11a engraved on the outer periphery of the fixed cylindrical body 8 so as to be held in mesh with the inner ring 8b. And the elastic ring 11
By setting the inner diameter of each of the planet rollers 26 to be slightly smaller than the inscribed circle diameter of each planet roller 26, at least one planet roller device is provided so that each planet roller 26 is brought into pressure contact with each of the elastic ring 11 and the sun roller 22b. We have proposed a bicycle hub power generator characterized in that.

[0003]

However, in the device of Japanese Patent Application No. 1-306433 mentioned above, the inner teeth 8b of the fixed cylinder 8 are
And outer teeth 10a, 11a engraved on the outer circumference of the elastic rings 10, 11.
Since and are loosely fitted, there is a clearance between the elastic rings 10 and 11 and the fixed cylindrical portion 8. For this reason the elastic ring
There is a problem that the fixed cylinders 8 and 10 and 11 come into contact with or separate from each other due to vibration during traveling of the bicycle, which causes noise.

Since the inner diameters of the elastic rings 10 and 11 are smaller than the diameter of the circle inscribed by the planetary rollers 24 and 26, the elastic rings 10 and 11 in a state in which the planetary rollers 24 and 26 are mounted so as to enclose them are Speaking to the extreme of a perfect circle, it transforms into a roughly triangular rice ball shape. Then, such deformation of the elastic rings 10 and 11 is moved by the rolling of the planet rollers 24 and 26. Therefore, the internal teeth 8b of the fixed cylinder 8 and the external teeth 10a, 11a of the elastic rings 10, 11 are caused by the movement of the deformed portion and the fluctuation of the driving torque of the rotating rotor 22 during the operation of the generator. Slippage occurs at the contact area,
There is a problem that this slip reduces the transmission efficiency.

[0005]

In order to solve the above problems, according to 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 generator coil is fixedly provided in the fixed cylinder, and a rotor integrally formed with a magnet is rotatably provided on the axle, and a hub is provided. In a hub built-in power generator having a planetary transmission that accelerates the rotation of the body and transmits it to the rotor,
A sun roller integral with the magnet rotatably provided on the axle, a plurality of planet rollers arranged to circumscribe the sun roller, a planet carrier for pivotally supporting the planet rollers, and a fixed cylindrical body. A plurality of tongue-shaped projections made of synthetic resin that engage with the projections from the inside are distributed tangentially on the outer circumference of the spring steel ring. It is configured by an elastic ring that is provided as a set, and the inner diameter of the elastic ring is set to be slightly smaller than the inscribed circle diameter of each planetary roller so that each planetary roller comes into pressure contact with each of the elastic ring and the sun roller. At least one set of planetary roller devices described above is provided to form a bicycle hub power generation device.

[0006]

As described above, according to the present invention, a plurality of synthetic resin tongue-shaped members are provided which are provided with projections at a plurality of locations on the inner circumference of the fixed cylinder and engage with the projections from the inside. Since the elastic ring is formed by tangentially arranging the protrusions on the outer periphery of the spring steel ring, the transmission between the fixed cylinder and each elastic ring is made by a flexible synthetic resin tongue-shaped protrusion. Will be done through. The tongue-shaped projection is flexible against deformation and movement in the radial direction and has high rigidity in the circumferential direction.

Therefore, according to the present invention, it is not necessary to increase the dimensional accuracy of the assembling of the fixed cylindrical body and the elastic ring, so that the manufacturing becomes easy. Further, the device of the present invention is free from rattling during operation and does not generate noise.

Further, since the engagement between the fixed cylinder of the device of the present invention and the elastic ring is performed through the tongue-shaped projection, the slip generated at the joint between the fixed cylinder and the elastic ring of the conventional device. Can be absorbed by the flexure of the tongue-shaped projections and the deformation of the elastic ring can be sufficiently absorbed by the tongue-shaped projections. Therefore, according to the present invention, the transmission efficiency can be improved with respect to the conventional device. You can

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, the same reference numerals as those used above denote the same components. In the figure, 1 is a front hawk which is a part of a bicycle frame, and 2 is an axle fixed across by nuts 3 across the ends of the left and right front hawks 1. In this embodiment, the hub body 4 of the front wheel is attached to one end (the left end in FIG. 1).
Is formed into an open hollow cylindrical shape, and the side cover 5 is provided at the open end.
The threaded portion is rotatably provided on the axle 2 via the ball bearing 6. The diameter of the hub body 4 on the open end side is expanded to form a large diameter portion 4a. Reference numeral 7 denotes wheel spokes attached to the hub body 4, respectively.

Further, one end of the hollow cylindrical fixed cylinder 8 (see FIG. 1)
(The right end in Fig. 1) is fitted to the axle 2 and fixed by the key 9, the other end (left end in Fig. 1) of this fixed cylinder 8 is opened, and the diameter on the open end side is expanded to a large diameter. Part 8a
And a plurality of locations on the inner circumference (in this embodiment,
Protrusions 8c are provided at 12 positions) at equally divided positions on the circumference. A plurality of (12 in this embodiment) tongue-shaped projections 30a and 31a made of synthetic resin, which engage with the convex portions 8c from the inside, are provided on the outer peripheral portions of the rings 30b and 31b also made of synthetic resin. These two rings 30b and 31b are distributed tangentially.
Are fitted to the outer peripheral portions of the spring steel rings 30c and 31c, respectively, to form a first elastic ring 30 and a second elastic ring 31.

Reference numeral 2a is a stepped portion provided on the axle 2, 2b is a lead wire take-out groove which also serves as a key groove, 15 is a washer, and 16 is a spring. Also, as shown in detail in FIG. 4, the grooved ring 17
A conducting wire 17b is wound in the groove of a to form a coil 17, and then strip-shaped magnetic pole pieces 18a are respectively arranged at positions where the outer circumference of the cylinder is divided into four, and these four magnetic pole pieces 18a each have a small diameter. The first armature 18 is integrally formed by connecting to the cylindrical portion 18b, the cylindrical portion 18b of the first armature 18 is inserted into the central hole 17c of the coil 17, and the cylindrical portion protruding from the central hole 17c. The second armature 19 is integrally formed by connecting the cylindrical portion 19b enclosing the 18b and the four strip-shaped magnetic pole pieces 19a respectively located in the middle of the four magnetic pole pieces 18a during assembly. The second armature 19 is fitted to the above-mentioned combined body of the coil 17 and the first armature 18 to integrally form the magneto coil assembly 20 as shown in FIG. Reference numeral 21 is a lead wire drawn from the coil 17.

And a power generating coil body constructed as described above
As shown in FIG. 1, 20 is inserted between the fixed cylindrical body 8 and the axle 2 and fixed, and the lead wire 21 is provided in the fixed cylindrical body 8.
It is taken out to the outside through the 8c and the groove 2b. In addition, the rotor 22 integrally formed by combining the magnet 22a and the second sun roller 22b has a structure in which the magnet 22a has the magnetic pole pieces 18a of the power generation coil body 20.
, 19a so as to be rotatable with respect to the axle 2. In addition, the first sun roller 23a and a disk-shaped planet carrier
23 is integrally formed, and the planet carrier 23 is formed on the rotor.
Three first planetary rollers 24 (see FIG. 5) are rotatably provided on the axle 2 between the side cover 5 of the hub body 4 and the second sun roller 23a. Are provided on the side lids 5 of the hub body 4 pivotally supported by shafts 25, respectively. Further, three second planet rollers 26 (see FIG. 6) are provided on the outer periphery of the second sun roller 22b so as to be pivotally supported on the planet carrier 23 by shafts 27, respectively.

The diameter of the inner peripheral surface of the above-mentioned first elastic ring 30 is formed to be slightly smaller than the diameter of the circle in which each first planetary roller 24 is inscribed.
30 is press-fitted to the outside of each first planetary roller 24 to
The planet roller 24 is brought into pressure contact with the first sun roller 23a. Similarly, the diameter of the inner peripheral surface of the second elastic ring 31 described above is made slightly smaller than the diameter of the circle inscribed by each second planetary roller 26, and the second elastic ring 31 having this small inner diameter is used for each second planetary roller. The second planetary roller 26 is press-fitted to the outside of 26 to bring the second planetary roller 26 into pressure contact with the second sun roller 22b.

Next, the operation of the device of the present invention configured as described above will be described. When the bicycle runs, the hub body 4 integrally formed with the wheels rotates together with the side lid body 5 and the shaft 25 in the direction of arrow A in FIG. In this case, the fixed cylinder 8
Is fixed, when the first planetary roller 24 revolves in the direction of the arrow A through the shaft 25, the first planetary roller 24 revolves around the first planetary roller 24.
The planetary roller 24 rotates in the direction of arrow B. By the revolution of the first planetary roller 24 in the direction of arrow A and the rotation of the first planetary roller 24 in the direction of arrow B, the first sun roller 23a rolling in contact with the first planetary roller 24 is accelerated in the direction of arrow C in FIG. Rotate. In this embodiment, the first elastic ring of the fixed tubular body 8
The inner diameter of 30 is 64 mm, and the outer diameter of the first sun roller 23a is
Since it is 16 mm, the rotation of the planet carrier 23 integrated with the first sun roller 23a is (64 + 16) ÷ 16 = 5, and therefore is increased to 5 times the rotation of the hub body 4.

When the planet carrier 23 integrated with the first sun roller 23a rotates in the direction of arrow C, the shaft 27 also rotates in the direction of arrow C as shown in FIG. It revolves in the direction of C and rotates in the direction of arrow D. Therefore, the second sun roller 22a, which makes contact with the roller and rolls, rotates at an increased speed in the direction of arrow E. In this embodiment, the diameter of the second elastic ring 11 of the fixed barrel 8 is 64.
mm and the outer diameter of the second sun roller 22a is 16 mm, the rotation of the rotor 23 integrated with the second sun roller 22a is
Since (64 +16) ÷ 16 = 5, the speed is increased five times that of the planet carrier 23. That is, the first stage planetary roller train and the second stage planetary roller train are 25 times (5 ×
The accelerated rotation of 5) is obtained. In this embodiment, two rows of planetary roller rows have been described, but the present invention can be applied even when the number of planetary roller rows is one or three.

[0016]

As described above, according to the present invention, the convex portions 8c are provided at a plurality of positions on the inner circumference of the fixed cylindrical body 8, and a plurality of synthetic resins are engaged with the convex portions 8c from the inside. Tongue-shaped protrusions 30a, 31a made of spring steel ring 30c,
Elastic ring 30, which is tangentially distributed around the outer circumference of 31c,
Since 31 is configured, the transmission between the fixed cylinder 8 and the elastic rings 30, 31 is performed by the flexible synthetic resin tongue-shaped projections 30a, 31a.
Will be done through. And this tongue protrusion
It will be performed via 30a and 31a. As shown in FIGS. 7 and 8, the tongue-shaped protrusions 30a and 31a are
It is flexible against deformation and movement in the radial direction, and has high rigidity in the circumferential direction.

Therefore, according to the present invention, it is not necessary to increase the dimensional accuracy of assembling the fixed cylindrical body 8 and the elastic rings 30 and 31, so that the manufacturing is facilitated. Further, the device of the present invention has the effect that there is no play during operation and no noise is generated.

Further, since the engagement between the fixed cylinder 8 of the device of the present invention and the elastic rings 30 and 31 is performed through the tongue-shaped projections 30a and 31a, the fixed cylinder and the elastic ring of the conventional device are connected. The slip generated at the joint can be absorbed by the deflection of the tongue-shaped protrusions 30a and 31a, and the deformation of the elastic rings 30 and 31 can be sufficiently absorbed by the tongue-shaped protrusions 30a and 31a. According to this, the effect that the transmission efficiency can be improved compared to the conventional device is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a device of the present invention.

FIG. 2 is a detailed view of a main part of FIG.

FIG. 3 is a perspective view of a power generation coil body.

FIG. 4 is an exploded perspective view of a power generation coil body.

FIG. 5 is a sectional view for explaining the operation of the first planetary roller train.

FIG. 6 is a sectional view for explaining the action of the second planetary roller train.

FIG. 7 is a partial detailed view of FIG.

FIG. 8 is a partial detailed view of FIG.

FIG. 9 is a cross-sectional view of a conventional device.

FIG. 10 is a sectional view of a first planetary roller train.

FIG. 11 is a sectional view of a second planetary roller train.

[Explanation of symbols]

 1 Front Hawk 2 Axle 3 Nut 4 Hub Body 5 Side Lid Body 6 Ball Bearing 7 Spoke 8 Fixed Cylindrical Body 9 Key 10 1st Elastic Ring 11 2nd Elastic Ring 12 Spacer 13 Corner Ring 14 Retaining Ring 15 Washer 16 Spring 17 Coil 18 No. 1 armature 19 2nd armature 20 generator coil body 21 lead wire 22 rotor 22a magnet 22b 2nd sun roller 23 planet carrier 23a 1st sun roller 24 1st planet roller 25 axis 26 2nd planet roller 27 axis 30 1st Elastic ring 30a Tongue-like protrusion 30b Ring 30c Spring steel ring 31 Second elastic ring 31a Tongue-like protrusion 31b Ring 31c Spring steel ring

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. The generator coil is fixedly installed in the fixed cylinder,
A rotor integrally formed with a magnet is rotatably provided on the axle, and a hub built-in power generator having a planetary transmission device for accelerating the rotation of the hub body to transmit the rotation to the rotor is provided. A sun roller integrated with the magnet provided,
A plurality of planet rollers arranged so as to be circumscribed to the sun roller, a planet carrier for pivotally supporting the planet rollers, and projections are provided at a plurality of locations on the inner circumference of the fixed cylinder, and the projections are provided. Is composed of an elastic ring in which a plurality of synthetic resin tongue-shaped projections that engage from the inside are distributed tangentially on the outer periphery of a spring steel ring, and the inner diameter of the elastic ring is A bicycle characterized by comprising at least one planetary roller device in which each planetary roller is pressed into contact with the elastic ring and the sun roller by setting the diameter slightly smaller than the inscribed circle diameter of each planetary roller. Hub power generator.