The present invention refers to a bottom bracket load sensor designed to measure the deformation of the end bearings of the bottom bracket as a result of the pedalling force. This sensor requires a special, customized design with deformation sensors arranged to measure the effective force ignoring parasitic forces. It is very important to have a true measurement, among other cases, for the optimization of the performance of electric motors on bicycles.

Power transmitted from a cyclist to a bicycle through crank arms is indirectly measured by performing calculations on direct physical measurements. The direct physical measurements are taken from sensors that can be non-rotationally coupled to the frame of the bicycle. The sensors can be integrated into the frame or installed as a module within a standard, unmodified bicycle bottom bracket. Measured power can be viewed by the cyclist using a wirelessly connected user interface device.

A bottom bracket for a bicycle may include a left bearing cup and a right bearing cup, the two bearing cups configured to be threaded together within a bottom bracket shell. Threading the bearing cups together may result in an axial force being applied to a resilient ring disposed on one of the bearing cups. This axial force may cause an outer diameter of the resilient ring to expand against an inner surface of the bottom bracket shell, thereby effectively locking the bottom bracket into the shell.

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 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.

A quick-mount crank-pedal mechanism for a children bicycle is provided. The quick-mount crank-pedal mechanism is composed of the following two parts including a crank rod and a crank bearing. The crank rod and the crank bearing are fitted with each other. With the mechanism, a pedal is enabled to be in a usable state quickly without using any tools, and a tip of the crank is effectively protected from puncturing through a carton, thereby reducing potential safety hazards.

A bicycle crank assembly having a rotational center axis is basically provided with a crank member and a sprocket member. The crank member includes a support portion that extends in the axial direction and an arm portion that is integrally rotatable around the rotational center axis with the support portion. The sprocket member includes a sliding portion that extends in the axial direction that is integrally rotatable with respect to the support portion and that is displaceable in the axial direction. The bicycle crank assembly is constructed to achieve high strength and to suppress the decrease in the efficiency of the rotation transmission from the crank member to the sprocket member in a crank assembly in which the sprocket member is movable in the axial direction.

A watercraft having a propulsion device accessible from within its cockpit. The propulsion device includes a pedaling assembly with seals to prevent ingress of water to the interior of the device's housing. The propulsion device may also include an accessory mount for a person to easily see and access electronic equipment and thereby keep the hands free for other tasks.

An electric bicycle central shaft torque sensing system, comprising a central shaft, a strain sleeve, a pedalling force output portion, a torque sensor and a five-way piece, one end of the strain sleeve being fixed on the five-way piece via a bearing and connected to the pedalling force output portion, another end being sleeved on the central shaft and fixedly connected thereto, an inner surface of the strain sleeve fitting with an outer surface of the central shaft, an outer surface of the strain sleeve being adhered to the torque sensor, the torque sensor transmitting a signal to a controller via a signal transmitter, the controller controlling motor output. The present invention prevents the current widespread phenomenon of unbalanced left/right foot detection during measurement by a torque sensing system. Measured radial torque accurately reflects the pedalling force, and a sprocket is driven via the strain sleeve whether the left foot or the right foot is pedalling, thereby ensuring smooth riding and increasing riding comfort.