KR20130100396A - Multispeed gear system - Google Patents

Abstract

PURPOSE: A speed change shaft of a multi stage transmission is provided to be simply controlled by diversifying a shaft control method. CONSTITUTION: A multi stage gear transmission has a fixed central shaft, a pole, and two or more speed change shafts. The pole is supported to the fixed central shaft. The speed change shafts surround the fixed central shaft or are inserted into the holes formed on the central shaft to be rotated. The speed change shafts control a speed change.

Description

Shifting shaft of multi-stage gear transmission {MULTISPEED GEAR SYSTEM}

The present invention relates to a transmission gear, and more particularly, to a shift shaft for shift control of a planetary internal hub transmission.

Multi-stage gear transmission is known in many embodiments that are applied in real life or industrial sites. As an example, in a bicycle, it is most common to stack a plurality of sprockets and install them on the rear wheel hub and the crank, respectively, to be coupled with a chain, and to select a gear stage through a derailleur. Such a transmission device can realize a speed ratio of 27 steps. However, there is a problem that the speed ratio is not overlapped or shifted at a constant rate when shifting from each step to the next step.

In another form, there is a planetary gear hub that installs planetary gears in the hub and controls rotation of the sun gear to shift or separate the sun gear from the central axis.

In one way the sun gear of the hub transmission is coupled to the central axis, the ratchet pawl is mounted on the inner surface of the sun gear, and the coupling groove to which the pole is coupled is formed on the central axis, and the pole is coupled to the coupling groove by the shift shaft. A transmission having an eight speed transmission ratio is known to be configured to control separation. This form has a problem in that the shape of the shifting shaft and the peripheral parts for shifting is complicated and the number thereof is difficult to manufacture, and the speed ratio between shifting stages is not constant.

Alternatively, the pole is mounted on the outer circumferential surface of the central shaft, the gear shaft with the cam surface is mounted on the hollow of the central shaft, and the engaging groove to which the pole is coupled is formed on the inner circumferential surface of the sun gear so that the pole stands or immerses along the cam surface. It is known that a transmission having a gear ratio of 14 steps is configured to engage or separate from a gear. This type increases the number of gear stages by inserting the gear shaft into the center shaft and rotating the gear shaft two revolutions.

With reference to the transmission of the above type, it is an object of the present invention to provide a transmission shaft suitable for shift control of a multi-stage transmission.

In order to solve the above problems, the transmission shaft of the multi-stage gear transmission of the present invention has a fixed central shaft and a hub built-in multi-stage gear transmission for shifting by controlling a pole supported on the central shaft. It has two or more shift shafts inserted into the axial holes.

The shift control method is diversified and can be easily controlled.

1 is an example of a transmission in which a shift shaft surrounds a central axis and shifts control
2 is an example of a transmission in which a shift shaft is shifted and controlled in a central axis;
3 is an example of a method of configuring two or more shift shafts,
a) is
b) is
c) is
d) is
e) is

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings, and the inventor may properly define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

The term "axial direction" is used herein to denote a direction or position along an axis parallel to the central axis of the transmission. The terms "radius" and "radial direction" are used to denote a direction or position extending perpendicular to the central axis of the transmission. For clarity and brevity, similar components that are often similarly labeled (eg, pole spring 64a and pole spring 64b) are collectively referred to as a single reference (eg, pole spring 64). Will be.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Although the present embodiment describes a transmission for use in a bicycle, the transmission of the present invention can be applied to any device that converts and outputs an input speed.

1: central axis
2: Paul
3: Shifting shaft for shifting control around the central axis
4: Shifting shaft for shift control in the center axis

Claims (2)

In a hub-integrated multi-stage gear transmission that has a fixed central shaft and controls a pole supported on the central shaft, the multi-stage gear has two or more transmission shafts that enclose and rotate the central shaft or are inserted into an axial hole formed in the central shaft. Transmission The method of claim 1, wherein the shift shaft
Multi-stage gear transmission that controls shifting with one

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