Bicycle inner transmission and manufacture method thereof

Abstract

The invention relates to a bicycle inner transmission and a manufacture method thereof. The transmission mainly comprises a fixed star frame, front star wheels, back star wheels, a sun wheel, a pawl ring, a shell cylinder, a moving star frame, an active cylinder, a double gear ring, an eight gear ring, and a gear shifting cylinder. a slow gear, a neutral gear and a fast gear are arranged. the front star wheels and the back star wheels are integrated wheel shaft members; the fixed star frame is a fixed part and is also used as a stationary sun wheel, and there are six front star wheels which are engaged with three back star wheels inside the frame; the sun wheel is engaged with the back star wheels and is provided with the pawl ring; the moving star frame is provided with four front star wheels and a pawl ring; the pawl ring is provided with a pawl milled with clutch teeth; the double gear ring is dynamically engaged with the eight gear ring for contrarotation gear shift and forward rotation transmission; the double gear ring is sleeved by the gear shifting cylinder to form an integrated part; the eight gear ring is sleeved by the active cylinder to form an integrated part and then is provided with a common chain wheel; power is transferred from the active cylinder and the eight gear ring to drive the double gear ring to the pawl ring through the gear shifting cylinder, and if the gear shifting cylinder is engaged with the sun wheel pawl ring, it is the slow gear; if the gear shifting cylinder is engaged with the moving star frame pawl ring, it is the fast gear; non engagement is the neutral gear.

Description

technical field [0001] The invention relates to an internal transmission of a bicycle and a manufacturing process thereof. Background technique [0002] Most bicycles now use external transmissions for speed change, that is, multiple flywheel chainrings of different sizes overlap to form a tower, and the speed is changed by chain translation and meshing with the flywheel chainrings. Contents of the invention [0003] The purpose of the present invention is to provide a small-volume, airtight mechanical transmission, which is convenient for the speed change of bicycles. In order to distinguish it from the external transmission, the mechanical transmission is called an internal transmission. Another object of the present invention is to provide a manufacturing process for an internal derailleur of a bicycle. [0004] The technical solution of the present invention is the described bicycle internal transmission. According to the traditional principle that the power input fr...

AI Technical Summary

Problems solved by technology

[0002] Most bicycles now use external transmissions for speed change, that is, multiple flywheel chainrings of different sizes overlap to form a tower, and the speed is changed by chain translation and meshing with the flywheel chainrings. It is large in size and has a lot of oil pollution, so it is not suitable for airtight and dustproof production.

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