Transmission assembly for bicycles

Abstract

The invention discloses a transmission assembly for a bicycle and an electric bicycle. One end of a transmission shaft is connected with a front driven gear in a fastening manner through a spline, a first locking bolt and a first gasket ring, and the other end of the transmission shaft is in fastening connection with a rear driving gear through a spline, a spring, a second gasket ring and a second locking bolt; a front protection cover and a rear protection cover are arranged at the two ends of a protection tube arranged on the transmission shaft in a sleeving manner respectively; the front protection cover is connected with a front box body through a connecting bolt, and a middle shaft is arranged in the front box body through a third bearing; the middle shaft is fixedly sleeved with a front driving gear; the front driven gear of the transmission shaft is mounted in the front box body through a first bearing, and is meshed with a front driving gear; and the rear protection cover is connected with a rear box body through a connecting bolt, and the rear driving gear of the transmission shaft is mounted in the rear box body through a second bearing. The transmission assembly is stable in transmission power, the waste rate of parts is reduced, the service life is prolonged, and the cost is reduced.

Description

technical field [0001] The invention relates to a transmission system of a bicycle, in particular to a transmission assembly for a bicycle. Background technique [0002] The transmission mode of the existing electric bicycle adopts sprocket and chain transmission. Although this transmission structure is provided with a chain baffle, it still belongs to an open transmission structure. The rider's trousers or skirt are easily entangled or bitten by the chain or sprocket , and even cause the rider to fall and cause property or personal injury. At the same time, as the speed increases, the chain tends to end grain or fall off after a period of use, requiring re-maintenance or installation, which brings a lot of trouble to the rider. In recent years, a drive system in which the transmission shaft replaces the chain drive has appeared on the market, but the existing transmission shaft is connected to the front driven gear and the rear driving gear by bolts, and then connected to ...

AI Technical Summary

Problems solved by technology

[0002] The transmission mode of the existing electric bicycle adopts sprocket and chain transmission. Although this transmission structure is provided with a chain baffle, it still belongs to an open transmission structure. The rider's trousers or skirt are easily entangled or bitten by the chain or sprocket , and even cause the rider to fall and cause property or personal injury

At the same time, as the speed increases, the chain tends to end grain or fall off after a period of use, requiring re-maintenance or installation, which brings a lot of trouble to the rider

In recent years, a drive system in which the transmission shaft replaces the chain drive has appeared on the market, but the existing transmission shaft is connected to the front driven gear and the rear driving gear by bolts, and then connected to each other through the bearing, the front cover, and the rear cover. During assembly, there is a lack of axial clearance between the transmission shaft and the front cover and the rear cover, so that the manufacturing precision of each component, the front cover and the rear cover is high, and the economic cost is high

At present, there are also some manufacturers who control the effective length of the bolt connection through the assembly process. Although the installation effect can be achieved, the efficiency is low and it is not suitable for batch operations. The cover is prone to displacement, looseness or falling off, or even damage. Since the transmission shaft, the front driven gear and the rear driving gear are connected by bolts, there is a lack of axial clearance, the bearing clearance is occupied, and the power transmission is unstable. Difficult, heavy ones cause damage to the bearings or the bolts at both ends, affecting the service life and personal safety, and bringing unnecessary troubles to consumers

Images