Adjusting and changing device of front-gear-disc transmission of bicycle

Abstract

The invention relates to an adjusting and changing device of a front-gear-disc transmission of a bicycle. The adjusting and changing device comprises a pipe-shaped shell, a crankshaft, a planetary gear speed-changing device, a control rod, a poking rod, a speed-changing ring, a guiding pin and a traction disc, wherein the crankshaft is provided with a shaft hole which is arranged in the pipe-shaped shell in a pivoting mode, the two ends of the crankshaft protrude and extend out of the pipe-shaped shell, and the exposed end of the left side of the crankshaft is provided with a long groove hole; the planetary gear speed-changing device is arranged at the exposed end of the right side of the crankshaft, and is driven to rotate by the crankshaft; the control rod is contained in the shaft hole of the crankshaft; the poking rod is arranged in the long groove hole of the crankshaft for containing the control rod in a penetrating manner, and the two ends of the poking rod protrude and extend out of the long groove hole and rotate synchronously along with the crankshaft; the speed-changing ring is arranged at the exposed end of the left side of the crankshaft, does not rotate along with the crankshaft, is connected with the poking rod and drives the poking rod to move along the long groove hole, and the outer ring surface of the speed-changing ring is provided with a guiding groove; the guiding pin is fixed with the pipe-shaped shell; and the traction disc is arranged on the pipe-shaped shell, can rotate by an angle under the traction of external force, and drives the speed-changing ring to rotate in a linking manner.

Description

technical field [0001] The invention is related to the speed change device of the bicycle, in particular to a modulation device of the front chainring transmission of the bicycle. Background technique [0002] The inventor of this case made an invention improvement for the bicycle front chainring transmission, and filed a patent application, which was compiled as the No. 102204515 patent application in Taiwan, China. This case uses a planetary gear system as the transmission of the bicycle front chainring. A control rod is arranged inside the crank shaft, and the two ends of the control rod protrude out of the crank shaft. The user uses the inner side of the foot to kick the control rod to make it shift, and then drives the planetary gear system to change speed. [0003] The above-mentioned speed change method is not convenient to use, and is different from the usage habits of the general public. How to improve the existing device so that it conforms to the usage habits of t...

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