JPS6011748A - Rotation mechanism - Google Patents

Abstract

PURPOSE:To provide a rotating mechanism suitable for a driving portion of a bicycle, which is light and can set the velocity ration at a large value by using a planetary gear mechanism. CONSTITUTION:A sun gear 3 is fixed to a car body 5 by a support piece 4, and a connecting shaft 7 rotatably supported on a main shaft 2 through a bearing 6 is inserted in the sun gear 3 along the axis thereof. The connecting shaft 7 has a main gear 8 fixed to one end thereof and an output wheel 9 fixed to the other end thereof. A planetary gear 11 is rotatably supported on a shaft 12 mounted midway of a crank 1 supported on the main shaft 2 and engaged with the sun gear 3 to revolve round the sun gear while revolving on its axis. A rotating gear 16 engaged with a gear 15 rotated with the planetary gear 11 in a body and with the main gear 8 is rotatably supported on a shaft 17 mounted midway of the crank 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotation mechanism that provides accelerated rotation.

Conventional rotating mechanisms that transmit rotational force by changing speed ratios have the problem that if they are formed so that the speed ratio can be set to a large value, the mechanism itself becomes large and heavy. For example, various types of bicycles, such as those with a fixed speed ratio or those with variable speed ratios, are manufactured, but the chain wheel on the drive side has many teeth and a large diameter. It becomes heavy. In addition, it is complicated to manufacture and expensive, and it has various problems such as difficulty in increasing the speed ratio on the drive side.

The present invention was made in view of the above circumstances, and is lightweight.
It is also an object of the present invention to provide a rotation mechanism that can set a large speed ratio.

Hereinafter, the present invention will be described in detail with reference to an illustrated embodiment applied to a bicycle power transmission mechanism.

In FIG. 1, lFi is a crank on one side supported by the main shaft 2, and 3 is a sun gear arranged concentrically with the main shaft 2 and fixed to the vehicle body 5 via a support rod 4. A connecting shaft 7 rotatably supported by the main shaft 2 through a bearing 6 is inserted on the axis of the sun gear 3, and this connecting shaft 7 has a main gear 8 at one end and an output at the other end. The wheels 9 are each fixed. A chain 10 is suspended from the output wheel 9 to transmit power to a wheel (not shown) that drives the rear wheels. 11 is the handle 1a of the above crank 1
A bearing 13 and a connecting shaft 14 are attached to a shaft 12 provided in the middle of the
This is a planetary gear rotatably supported via a planetary gear, which meshes with the sun gear 3 and revolves around the sun gear 3 while rotating on its own axis. Reference numeral 15 denotes a gear supported by the connecting shaft 14, which rotates together with the planetary gear 11. A transfer gear 16 is supported via a bearing 18 on a shaft 17 provided in the middle of the handle 1a of the crank 1, and this gear meshes with the planetary gear 11 and the main gear 8 to rotate the planetary gear 110 times. Rotation in the same direction is transmitted to the main gear 8.

Next, the operation of the rotation mechanism described above will be explained. When you step on the pedal and rotate the crank 1, the planetary gear 11 shifts to the sun gear 3.
It revolves around its axis while rotating. And the planetary gear 11
A gear 15 integral with the main gear 8 revolves around the main gear 8 while rotating, and transmits rotation to the main gear 8 via a transfer gear 16 meshed with the gear 15. When the main gear 8 rotates, an output wheel 9 provided integrally with the main gear 8 rotates, and the rotation accelerated by the gear mechanism is transmitted to the rear wheel side via the chain 10.

Thereby, more rotation than the rotation speed of the crank 1 can be transmitted to the rear wheels.

Next, FIG. 2 shows another embodiment of the present invention, in which the same parts are given the same reference numerals and the explanation thereof will be omitted.

In this case, a main sprocket 19 and a sprocket addition are used in place of the main gear 8 and gear 15 shown in FIG. 1, and rotational power is transmitted by a chain 21.

As a result, even if the transfer gear 16 shown in FIG. 1 is omitted, rotation in the same direction as the crank j can be obtained.

Further, FIG. 3 shows an application example of the present invention, in which an internal gear n is used as the sun gear, and this internal gear n is fixed to the vehicle body 5 via the support rod 4. The planetary gear meshing with the internal gear 4 is supported via a bearing 5 on a shaft provided midway through the handle 1a of the crank 1. A gear is meshed with this single planetary tooth, and this gear is connected to the handle 1a of the crank 1.
It is rotatably supported on a shaft γ provided in the middle.

Another gear train meshes with the gear 26, and this gear train is also rotatably supported by a shaft 4 provided in the middle of the handle 1a of the crank l and meshes with the main gear 8.

The action of this rotation mechanism is such that as the crank 1 rotates, a single planetary tooth revolves around its axis while rotating along a single sun tooth.

The rotation of this planetary gear portion is transmitted to the gear path via the gear 26, and the main gear 8 rotates via this gear. In this way, the rotation of the main gear 8 causes the output wheel 9 to rotate,
The increased rotation speed is transmitted to the rear wheels via the chain 10.

As described above, according to the rotation mechanism of the present invention, the planet gear rotates as the crank rotates, the rotation speed is increased by the tooth ratio with the sun gear, and this increased rotation is transferred to the output wheel. Since the rotation speed is increased, it is possible to easily obtain faster rotation with an extremely simple configuration.

Particularly in the case of bicycles, since they are lightweight and can generate a large number of revolutions, the speed ratio when riding on flat ground can be further improved.

Note that the present invention is not limited to the above-mentioned embodiments. For example, if the crank is rotated by an electric motor and used as a power source for something other than a bicycle, a disc-shaped rotating body may be used for the crank. Furthermore, by using an internal gear as the main gear in the embodiment shown in FIG. 1, the transfer gear can be placed inside the main gear.

[Brief explanation of drawings]

FIG. 1 is a conceptual cross-sectional view showing a rotation mechanism according to one embodiment of the present invention, FIG. 2 is a conceptual cross-sectional view showing a rotation mechanism according to another embodiment of the present invention, and FIGS. A rotation mechanism according to an applied example of the invention is shown, with FIG. 3 being a conceptual sectional view and FIG. 4 being a right side view of FIG. 3. 1...Crank, 2...Main shaft, 3.
...Sun gear, 8...Main gear, 9...
...Output wheel, 11.23...Planetary gear, 15.26...Gear, 19...Main sprocket, Addition...Sprocket, n ...
...Internal gear.

Claims (1)

[Scope of Claims] (11) A point of a rotating body in which a planetary gear meshing with the sun gear and rotating and revolving along the sun gear is supported on the main shaft at a predetermined distance in the radial direction from the main shaft. The rotation of the planetary gear is transmitted via a transmission means to an output wheel rotatably supported on the main shaft, and the rotation of the rotating body is extracted from the output wheel at an increased speed. (2) A gear rotating integrally with the planetary gear is supported coaxially with the planetary gear, and rotation of the gear is transmitted to a main gear rotating integrally with the output wheel. The rotation mechanism according to claim (1).(3) A sprocket that rotates integrally with the planetary gear is supported coaxially with the planetary gear, and the rotation of the sprocket is controlled by the rotation of the sprocket. Claim 1 (1) characterized in that the transmission is transmitted to a main sprocket that rotates together with the output wheel.
) The rotation mechanism described in section 2. (4) The rotation mechanism according to claim m, wherein an internal gear is used as the sun gear.