Clutch type electric bicycle chain wheel driving mechanism

Abstract

The invention discloses a clutch type electric bicycle chain wheel driving mechanism. The driving mechanism comprises a wheel shaft, a motor end disc, a chain wheel, an outer end disc and a reset spring, wherein the outer end disc, the chain wheel and the motor end disc are sequentially installed on the wheel shaft from outside to inside, a circle of teeth are arranged on an outer end surface of the motor end disc, the chain wheel and the wheel shaft are installed in a rotating mode, are in clearance sliding fit and can slide in the axial direction of the wheel shaft, locking columns matched with teeth of the motor end disc are arranged on one surface, opposite to the motor end disc, of the chain wheel, a ratchet pawl mechanism used for driving the chain wheel to get close to the motor enddisc is arranged between the chain wheel and the outer end disc, and a reset spring is installed between the chain wheel and the motor end disc and provides restoring force for the chain wheel to disengage from the motor end disc. The driving mechanism is advantaged in that the chain wheel is only in meshed transmission with the motor wheel in a riding state, so the working time of the chain wheel is greatly shortened, the service life of the chain wheel is prolonged, moreover, running noise of the chain wheel is reduced, and the follow-up rotation condition is avoided.

Description

technical field [0001] The invention belongs to the technical field of electric bicycles, in particular to a clutch type electric bicycle sprocket drive mechanism. Background technique [0002] See attached Figure 6 and 7 , the existing bicycle rear wheel drive structure is that the motor wheel is installed on the rear wheel shaft a, the motor end plate b of the motor wheel is provided with a threaded port b-1 for installing the flywheel (ie sprocket wheel), and the flywheel c is installed through threads The threaded port is fixedly installed with the motor wheel, and there is a ring of teeth on the outer ring of the flywheel, so that the outer ring of the flywheel is connected with the crank wheel through a chain to realize chain transmission, and the inside of the flywheel adopts a ratchet pawl structure to ensure riding The one-way transmission of this flywheel transmission structure has the following problems: [0003] 1. The flywheel always runs with the motor wheel...

AI Technical Summary

Problems solved by technology

[0003] 1. The flywheel always runs with the motor wheel, which greatly increases the working time of the flywheel. Since the flywheel has a ratchet and pawl structure to ensure the one-way transmission of riding, the ratchet and pawl structure inside the flywheel is prone to damage, resulting in lower service life

[0004] 2. After the flywheel has worked and aged for a long time, it is prone to crank rotation (when the motor wheel is running, due to the aging friction inside the flywheel, it may drive the outer ring of the flywheel to rotate, and then the outer ring of the flywheel drives the chain to rotate, and the chain drives the crank Follow-up), the crank follow-up will cause the power-assist sensor to send a power-assist signal to the controller. The controller mistakenly thinks that the customer uses the power-assist function, resulting in a speeding car, which brings hidden dangers to the travel safety of the customer.

[0005] 3. After the flywheel has been aging for a long time, when the motor wheel drives the flywheel to run, there will be a lot of noise

[0006] 4. The flywheel is installed on the end plate of the motor through threads, and the flywheel is easy to run back for a long time, which will cause safety hazards

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