A connecting device for a chainring of a bicycle is disclosed, including a connecting disc, a shaft, and a crank. The connecting disc is adapted to be engaged with a chainring, and has an axial bore, a bulging portion bulging from a central portion of the connecting disc, and a surrounding portion, which is flat, and surrounds an outer periphery of the bulging portion. The shaft passes through the axial bore to be fixedly engaged with the connecting disc. The shaft has a connecting end. The crank has a connecting end engaged with the connecting end of the shaft, and a bearing end adapted to bear an external force to make the crank rotate around the shaft. Whereby, the amount of materials used to make the connecting device is decreased. At the same time, the manufacturing cost, the size, and the weight of the connecting device are all reduced.

A crank assembly for a pedal-driven vehicle includes a first member, a second member, and a rotary sensor. The first member rotates about a crank axis of the pedal-driven vehicle. The second member is rotationally coupled to the first member and is configured to pivot about the first member via a member pivot. The second member also is configured to receive a pedal at a pedal interface. The rotary sensor is coupled to the first member and configured to measure rotation of the second member relative to the first member.

A crank assembly for a pedal-driven vehicle includes a first member, a second member, and a rotary sensor. The first member rotates about a crank axis of the pedal-driven vehicle. The second member is rotationally coupled to the first member and is configured to pivot about the first member via a member pivot. The second member also is configured to receive a pedal at a pedal interface. The rotary sensor is coupled to the first member and configured to measure rotation of the second member relative to the first member.

The present invention relates to a bicycle crank axle torque modulation device (1), comprising a bracket (3) including a spring-bearing assembly (4), wherein each end of the spring (7) thereof is connected to each of the bearings (6) by a connection member (8); an eccentric surface (5) for driving said spring-bearing assembly (4), which is in permanent contact with the bearings (6) of said spring-bearing assembly (4), wherein one of the bracket (3) and the eccentric surface (5) is arranged to be attached to a bicycle frame and the other to be attached to said bicycle crank axle. The invention further relates to a torque tuning process, a kit comprising a crank axle and the modulation device, and to a bike including the same.

An electric vehicle and a range extender engine are shown including the controls to operate the same.

A measuring device for a pedal plane angle of a bicycle includes a pedal body, an angle sensing unit and a central processing unit (CPU). The angle sensing unit is disposed in an accommodating chamber of the pedal body, and senses an angle of the pedal body to send an angle sensing signal. The CPU analyzes the angle sensing signal to obtain angle data of the pedal body relative to an angle of a reference plane to accordingly learn an angle relationship between the pedal body and the reference plane. The angle relationship may coordinate with other sensing units, for example, data of a pedaling force sensing unit to mutually correct and analyze the data, so as to obtain correct pedaling force information. With the angle data, whether a pedaling angle of a rider is correct can be learned to prevent sports injuries caused by incorrect pedaling angles.

A power meter for a bicycle includes a body having a torque input section and a torque output section, the body configured to transmit power between the torque input section and the torque output section. The power meter also includes a printed circuit board (“PCB”) having a substrate and at least one strain measurement device attached to the PCB.

A bicycle crank assembly is provided having a sprocket flange and a pedal crank arm, the sprocket flange being coaxially affixed to a bicycle crank shaft, the first end of the pedal crank arm being coaxially mounted about a laterally projecting generally cylindrical shaft member of the sprocket flange, a pedal bolt being affixed proximate a distal end of the pedal crank arm, and the pedal crank arm being affixed proximate the perimeter of the sprocket flange generally opposite the pedal bolt with a 145 degree offset about the axis of rotation of the bicycle crank shaft to increase the distance from the drive bolt to the pedal and to increase the leverage and power imparted to the bicycle crank assembly. A sprocket is coaxially affixed to the sprocket flange. A second pedal-powered crank assembly is coaxially affixed to the opposite end of the bicycle crank shaft, with a 180 degree offset about the axis of rotation of the bicycle crank shaft from the first pedal-powered crank assembly to provide continuous, uninterrupted torque to the bicycle crank shaft through a 360-degree rotation of the pedal-powered crank assembly.

A bicycle crank assembly is provided having a sprocket flange and a pedal crank arm, the sprocket flange being coaxially affixed to a bicycle crank shaft, the first end of the pedal crank arm being coaxially mounted about a laterally projecting generally cylindrical shaft member of the sprocket flange, a pedal bolt being affixed proximate a distal end of the pedal crank arm, and the pedal crank arm being affixed proximate the perimeter of the sprocket flange generally opposite the pedal bolt with a 145 degree offset about the axis of rotation of the bicycle crank shaft to increase the distance from the drive bolt to the pedal and to increase the leverage and power imparted to the bicycle crank assembly. A sprocket is coaxially affixed to the sprocket flange. A second pedal-powered crank assembly is coaxially affixed to the opposite end of the bicycle crank shaft, with a 180 degree offset about the axis of rotation of the bicycle crank shaft from the first pedal-powered crank assembly to provide continuous, uninterrupted torque to the bicycle crank shaft through a 360-degree rotation of the pedal-powered crank assembly.

A composite bicycle crank with an integral spindle attachment structure provides a unique method for attaching a bicycle crank arm to a bicycle crank spindle, and also for attaching a bicycle crank arm to a crank arm insert. A light-weight crank arm is able to be manufactured separately from the crank spindle or insert, and then securely attached after both pieces have been made. This allows for the pieces of the crank assembly to be manufactured from one or more different materials, and securely connected after manufacturing, to create a lower weight assembly than would be possible otherwise.