A system and method for simple transmission of a multi-speed bicycle is provided. A bicycle can have a transmission that can be toggled by a kickback shifting mechanism. A rear wheel hub can support a freewheel having a high speed gear sprocket and a low speed gear sprocket with dedicated chains to create dedicated gear-shifting. Rotating the pedal shaft in the non-drive direction approximately one-quarter rotation can toggle the transmission between the first gear ratio and the second gear ratio with a shifting surface that alternately allows driving engagement of the high speed gear sprocket with the rear wheel driver.

A system and method for simple transmission of a multi-speed bicycle is provided. A bicycle can have a transmission that can be toggled by a kickback shifting mechanism. A rear wheel hub can support a freewheel having a high speed gear sprocket and a low speed gear sprocket with dedicated chains to create dedicated gear-shifting. Rotating the pedal shaft in the non-drive direction approximately one-quarter rotation can toggle the transmission between the first gear ratio and the second gear ratio with a shifting surface that alternately allows driving engagement of the high speed gear sprocket with the rear wheel driver.

The silent drive chain system for a motorcycle rear drive includes a small chain wheel, a large chain wheel and a silent drive chain, where the silent drive chain is a toothed chain and includes: an outer chain plate, inner chain plates, a guide plate, a pin, a sleeve and a damping sealing ring; the sleeve is in interference fit with mounting holes of both the inner chain plate and the guide plate and forms an inner chain link together with the inner chain plate and the guide plate, the pin penetrates into the sleeve and is in clearance fit with the sleeve, two ends of the pin are in interference fit with a mounting hole of the outer chain plate, and form an outer chain link together with the outer chain plate, and the damping sealing ring is arranged between the outer chain link and the inner chain link.

The silent drive chain system for a motorcycle rear drive includes a small chain wheel, a large chain wheel and a silent drive chain, where the silent drive chain is a toothed chain and includes: an outer chain plate, inner chain plates, a guide plate, a pin, a sleeve and a damping sealing ring; the sleeve is in interference fit with mounting holes of both the inner chain plate and the guide plate and forms an inner chain link together with the inner chain plate and the guide plate, the pin penetrates into the sleeve and is in clearance fit with the sleeve, two ends of the pin are in interference fit with a mounting hole of the outer chain plate, and form an outer chain link together with the outer chain plate, and the damping sealing ring is arranged between the outer chain link and the inner chain link.

An electric pedal-assist bicycle may have a drivetrain including a crankset and an electric motor (e.g., a hub motor). A motor controller of the bicycle is configured to dynamically drive the motor to propel the bicycle based on a plurality of inputs. The inputs include information received from one or more of the following: user-related input(s), vehicle-related sensor(s), environmental sensor(s), and software. For example, the controller may drive the motor based on pedaling cadence and vehicle pitch orientation.

An electric pedal-assist bicycle may have a drivetrain including a crankset and an electric motor (e.g., a hub motor). A motor controller of the bicycle is configured to dynamically drive the motor to propel the bicycle based on a plurality of inputs. The inputs include information received from one or more of the following: user-related input(s), vehicle-related sensor(s), environmental sensor(s), and software. For example, the controller may drive the motor based on pedaling cadence and vehicle pitch orientation.

A frame for an electric bicycle, such as a long-tail electric cargo bicycle, is described. The bike frame, in some embodiments, includes cross members that connect a rear rack of the bicycle to a head tube of the bicycle via a seat tube of the bicycle. Via the multiple connection points, the cross members mitigate side to side movement, such as waggling, of the rear rack of the bicycle.

A frame for an electric bicycle, such as a long-tail electric cargo bicycle, is described. The bike frame, in some embodiments, includes cross members that connect a rear rack of the bicycle to a head tube of the bicycle via a seat tube of the bicycle. Via the multiple connection points, the cross members mitigate side to side movement, such as waggling, of the rear rack of the bicycle.

This invention provides a reciprocating linear prime mover, comprising a first roller, disposed on a first driving axis along with a second axis; a second roller, disposed on a second driving axis along with the second axis; a closed first linear driving element winded on and between the first roller and the second roller, comprising a first linear part and a second linear part between the first roller and the second roller, wherein the second linear part is above the first linear part along a (+) third axis; a first part disposed between the first roller and the second roller, wherein the first part is reciprocatingly moved along with the first axis, and the first part comprises a first one-way clutch nearby the inner side of the first linear part and contacting therewith, and a second one-way clutch nearby the inner side of the second linear part and contacting therewith.

This invention provides a reciprocating linear prime mover, comprising a first roller, disposed on a first driving axis along with a second axis; a second roller, disposed on a second driving axis along with the second axis; a closed first linear driving element winded on and between the first roller and the second roller, comprising a first linear part and a second linear part between the first roller and the second roller, wherein the second linear part is above the first linear part along a (+) third axis; a first part disposed between the first roller and the second roller, wherein the first part is reciprocatingly moved along with the first axis, and the first part comprises a first one-way clutch nearby the inner side of the first linear part and contacting therewith, and a second one-way clutch nearby the inner side of the second linear part and contacting therewith.