The present disclosure provides a new chainring system and method of installing and removing a chainring. The system eliminates the need for the use of special tools to install and remove a chainring.

A drive system for a vehicle includes a chain ring and a drive chain. The chain ring has a plurality of teeth serially arranged and joined to one another. A first subset of teeth has a first outer face that applies a lateral pressure to a link of a drive chain in a first direction. A second subset of teeth has a second outer face that applies a lateral pressure to another link of a drive chain in a second direction. The teeth all have substantially the same width. The top surfaces of the teeth are offset from the centerline of the drive chain. The centerlines of the top surfaces of the teeth are arranged asymmetrically on one side of the centerline of the drive chain.

A drive system for a vehicle includes a chain ring and a drive chain. The chain ring has a plurality of teeth serially arranged and joined to one another. A first subset of teeth has a first outer face that applies a lateral pressure to a link of a drive chain in a first direction. A second subset of teeth has a second outer face that applies a lateral pressure to another link of a drive chain in a second direction. The teeth all have substantially the same width. The top surfaces of the teeth are offset from the centerline of the drive chain. The centerlines of the top surfaces of the teeth are arranged asymmetrically on one side of the centerline of the drive chain.

A harmonic deceleration module, a dynamic power device, an automatic mobile vehicle, a transfer apparatus, a dynamic power supply system, and an electric bicycle are provided. The harmonic deceleration module includes a connecting member, a flexible bearing, a first frame, a first circular spline, a second frame, and a second circular spline. When the connecting member is driven, the connecting member rotates around a central axis. The connecting member has a cam part, and the cam part and the flexible bearing jointly form a wave generator. The wave generator is configured to be driven by the connecting member to drive a flexspline to continually and flexibly deform, and the flexspline drives the second circular spline and the second frame connected to the second circular spline to rotate. The second frame has a hollow channel penetrating through the second frame along the central axis.

A harmonic deceleration module, a dynamic power device, an automatic mobile vehicle, a transfer apparatus, a dynamic power supply system, and an electric bicycle are provided. The harmonic deceleration module includes a connecting member, a flexible bearing, a first frame, a first circular spline, a second frame, and a second circular spline. When the connecting member is driven, the connecting member rotates around a central axis. The connecting member has a cam part, and the cam part and the flexible bearing jointly form a wave generator. The wave generator is configured to be driven by the connecting member to drive a flexspline to continually and flexibly deform, and the flexspline drives the second circular spline and the second frame connected to the second circular spline to rotate. The second frame has a hollow channel penetrating through the second frame along the central axis.

The present invention is directed to compositions with solvent, wax and graphene. These compositions offer surprising benefits in reducing bicycle or motorbike chain lengthening, particularly in off road environments with high dirt and water levels such as during mountain biking or off-road biking. The invention is further directed to a method of preparing such compositions and to the use of such compositions on bicycle or motorbike chains.

The present invention is directed to compositions with solvent, wax and graphene. These compositions offer surprising benefits in reducing bicycle or motorbike chain lengthening, particularly in off road environments with high dirt and water levels such as during mountain biking or off-road biking. The invention is further directed to a method of preparing such compositions and to the use of such compositions on bicycle or motorbike chains.

A chain stay for a bicycle has: a first side wall having front and rear ends; a second side wall having front and rear ends, the second side wall being laterally spaced from the first side wall, the front end of the first side wall being forward of the front end of the second side wall; a third wall extending between the first and second side walls, the third wall defining an aperture therethrough permitting the passage of a flexible drive member of the bicycle therethrough; and a top wall connected to tops of the first, second and third side walls. At least a portion of the third wall extends downward from the top wall and from one of the first and second walls toward another one of the first and second walls. A width of the aperture is less than a distance between the first and second walls.

A chain stay for a bicycle has: a first side wall having front and rear ends; a second side wall having front and rear ends, the second side wall being laterally spaced from the first side wall, the front end of the first side wall being forward of the front end of the second side wall; a third wall extending between the first and second side walls, the third wall defining an aperture therethrough permitting the passage of a flexible drive member of the bicycle therethrough; and a top wall connected to tops of the first, second and third side walls. At least a portion of the third wall extends downward from the top wall and from one of the first and second walls toward another one of the first and second walls. A width of the aperture is less than a distance between the first and second walls.

This invention relates to a tool for insertion into an aperture on a chainring of an electric bicycle, the tool comprising a body which is shaped to abut a pedal arm of the electric bicycle and a head which is shaped to be received by the aperture. This invention also relates to a chainring for an electric bicycle comprising an aperture which is shaped to receive a complementarily shaped tool. In addition, this invention relates to a kit comprising the chainring and the tool, as well as to a method of cleaning and/or lubricating a drivetrain of an electric bicycle using the tool and the chainring.