How to buy motorized bicycles?
The invention is directed at a power assist module for a electric bicycle china comprising a power source; a motor, connected to the power source; an output drive gear, controlled by motor through gear reduction; a multi-geared hub, mounted on a wheel of the bicycle; and a motor drive system connecting the output drive gear with the multi-geared hub; wherein rotation of the output drive gear by the motor, causes the drive chain to rotate the hub, thereby rotating the wheel of the bicycle. Bicycles have been a form of transportation for many years and in some countries, the main mode of transportation. In more recent times, bicycles have been equipped with means to reduce the amount of energy required by the rider to propel the bicycle, such as by adding electric drives. Prior art electric drives for bicycles can be divided into various categories such as a friction drive on the bicycle wheel; an electric through the pedal shaft to the rear wheel; an electric through the chain to the rear wheel; an electric drive through a freewheeling sprocket (chain or gear); a direct drive to the rear wheel; or a wheel hub motor.
Motorized bicycles are a great way to go green, save money and get some fresh air, but there are many options and restrictions to look at when purchasing one.Find out what the restrictions are in your state. The laws on riding motorized bicycles vary greatly from state to state.Electric drives through the pedal shaft to the rear wheel are usually heavy, bulky gearboxes with electric motors attached. The disadvantage of this system is that a rider must pedal when the motor is in operation. Although the electric drive can be isolated from the rider, the rider must still pedal at the drive speed to augment driving force. Versions that allow the motor to drive the rear wheel without turning the pedals are available, but they require additional non-standard mechanisms, which increase the cost of the bicycle. A further disadvantage of this type of drive is that, in high gear, the pedal shaft turns at about one third of the speed of the rear wheel; therefore, the rotational speed of the motor must be reduced by a factor of about three times when driving through the pedal shaft. As the power from the motor is transmitted through the pedal shaft to the rear wheel has to be sped up again, to about three times the pedal shaft speed. Both the additional reduction and the subsequent acceleration add to friction losses and a loss in overall efficiency of the bicycle.
Decide on an electric or gas motor. Generally speaking, quality gas motors are more expensive and require more maintenance but will travel faster and farther while electric motors are less expensive and require less maintenance and travel shorter distances at lower speeds.You also need to decide on whether to purchase a kit to add a motor to an existing bicycle or just buy a fully built motorized bicycles .Another disadvantage of drives through the pedal shaft is that the bulky transmission and motor combination around the pedal shaft requires the battery to be relegated to a higher position on the bike frame, away from the center of the bicycle, causing balance problems. A disadvantage of electric bicycles with drives through the chain to the rear wheel is that they do not allow multiple front sprockets. The drive gear, typically mounted after the front crank sprocket, shortens the flex length of the chain which can result in the chain wear and dislodging from the electric drive sprocket.
source:townhall|motorized bicycles
Motorized bicycles are a great way to go green, save money and get some fresh air, but there are many options and restrictions to look at when purchasing one.Find out what the restrictions are in your state. The laws on riding motorized bicycles vary greatly from state to state.Electric drives through the pedal shaft to the rear wheel are usually heavy, bulky gearboxes with electric motors attached. The disadvantage of this system is that a rider must pedal when the motor is in operation. Although the electric drive can be isolated from the rider, the rider must still pedal at the drive speed to augment driving force. Versions that allow the motor to drive the rear wheel without turning the pedals are available, but they require additional non-standard mechanisms, which increase the cost of the bicycle. A further disadvantage of this type of drive is that, in high gear, the pedal shaft turns at about one third of the speed of the rear wheel; therefore, the rotational speed of the motor must be reduced by a factor of about three times when driving through the pedal shaft. As the power from the motor is transmitted through the pedal shaft to the rear wheel has to be sped up again, to about three times the pedal shaft speed. Both the additional reduction and the subsequent acceleration add to friction losses and a loss in overall efficiency of the bicycle.
Decide on an electric or gas motor. Generally speaking, quality gas motors are more expensive and require more maintenance but will travel faster and farther while electric motors are less expensive and require less maintenance and travel shorter distances at lower speeds.You also need to decide on whether to purchase a kit to add a motor to an existing bicycle or just buy a fully built motorized bicycles .Another disadvantage of drives through the pedal shaft is that the bulky transmission and motor combination around the pedal shaft requires the battery to be relegated to a higher position on the bike frame, away from the center of the bicycle, causing balance problems. A disadvantage of electric bicycles with drives through the chain to the rear wheel is that they do not allow multiple front sprockets. The drive gear, typically mounted after the front crank sprocket, shortens the flex length of the chain which can result in the chain wear and dislodging from the electric drive sprocket.
source:townhall|motorized bicycles