Power assisting device and power assisting bicycle

Abstract

The invention discloses a power assisting device and a power assisting bicycle. The power assisting device comprises a motor, a crank-set, a drive shaft, a flywheel, a first drive wheel, a second drive wheel and a pedaling force measuring device; a motor controller of the motor controls output of a torque; a transmission connection is established between the crank-set and the first drive wheel through a first chain or a first belt; the transmission connection is established between the second drive wheel and the flywheel through a second chain or a second belt; the first drive wheel and the second drive wheel are installed on the drive shaft; the torque on the first drive wheel can be transmitted to the second drive wheel; the pedaling force measuring device includes a swing arm which swings under the tension of the first chain or the first belt, and a sensor for detecting a rotation angle or a displacement distance of the swing arm; the sensor sends a detected electrical signal to themotor controller; and the motor controller controls the motor to output the corresponding torque. With the power assisting device and the power assisting bicycle disclosed by invention, effective accommodation and sealing for related components can be implemented, thereby improving the reliability of the device.

Description

technical field [0001] The invention belongs to the technical field of electric motor vehicles, and in particular relates to a booster device and a booster bicycle. Background technique [0002] All bicycles using power assist need to be controlled by a motor controller to provide power for the bicycle according to the movement speed or force information of the bicycle. For example, the invention patent with the application number "2017103083387" and the invention title "an integrated power-assisted device and power-assisted bicycle" records a power-assisted scheme, which judges the current driving force that needs to be output by detecting the tension of the chain or belt. In order to achieve the purpose of assistance. Since this power assisting method can accurately reflect the information and state of the current movement of the bicycle, the power assisting effect is better. [0003] However, through long-term use of the product, it has been found that in the technical ...

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Problems solved by technology

[0003] However, through long-term use of the product, it has been found that in the technical solution disclosed in the above-mentioned patent, the pedal force measuring device, the first sprocket, the chainring and the auxiliary wheel are all exposed outside the casing, which causes many problems:

[0004] 1. Due to the chain transmission driving method, relatively large noise is generated during the transmission process, which in turn has a certain adverse effect on the rider and the surrounding crowd

[0005] 2. Since the transmission parts need to be lubricated with lubricating oil, but the completely exposed setting method will accelerate the consumption of lubricating oil, resulting in the transmission parts not being lubricated effectively for a long time, accelerating the loss of parts, reducing the reliability of the device and increasing maintenance costs

[0006] 3. Due to the relatively short center distance between transmission components such as the tooth plate, the first sprocket and the auxiliary wheel, once the vehicle passes through the muddy road, the dirt attached to the chain or belt may be deposited between these sprockets, causing Faults such as transmission failure reduce the reliability of the device, which not only seriously affects the riding experience, but also increases maintenance costs

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