In a frictional propulsion device comprising a frame, a main wheel including driven rollers rotatably supported by an annular core member about a tangential direction and a pair of drive disks each carrying drive rollers rotatable about a rotational center line at an angle with respect to both a tangential line of the drive disk and the rotational center line of the drive disk such that the drive rollers at least partly engage the driven rollers, each drive disk includes a hub rotatably supported by the support shaft, a disk member attached to a peripheral part of the hub, and holder beams arranged circumferentially between the hub and the disk member such that each holder beam is attached to the hub at a first end thereof and to the disk member at a second end thereof, each drive roller being rotatably supported by a corresponding adjoining pair of holder beams.

In a frictional propulsion device comprising a frame, a main wheel including driven rollers rotatably supported by an annular core member about a tangential direction and a pair of drive disks each carrying drive rollers rotatable about a rotational center line at an angle with respect to both a tangential line of the drive disk and the rotational center line of the drive disk such that the drive rollers at least partly engage the driven rollers, each drive disk includes a hub rotatably supported by the support shaft, a disk member attached to a peripheral part of the hub, and holder beams arranged circumferentially between the hub and the disk member such that each holder beam is attached to the hub at a first end thereof and to the disk member at a second end thereof, each drive roller being rotatably supported by a corresponding adjoining pair of holder beams.

A water shield structure for a transportation device and the transportation device having such a water shield structure. The transportation device is preferably a self-balancing device and may include a friction drive motor. The water shield structure helps reduce the entry of moisture from a riding surface into the wheel envelope or drive mechanism of the device. The water shield structure may extend laterally from a wheel and be enclosed, at least in part, in a housing.

A water shield structure for a transportation device and the transportation device having such a water shield structure. The transportation device is preferably a self-balancing device and may include a friction drive motor. The water shield structure helps reduce the entry of moisture from a riding surface into the wheel envelope or drive mechanism of the device. The water shield structure may extend laterally from a wheel and be enclosed, at least in part, in a housing.

Drive disks are configured to rotate a main wheel by applying a frictional force thereto. Each of the drive disks includes a base and a plurality of rollers. The base includes a first sheet metal member and a second sheet metal member. The first sheet metal member includes a first central part and a plurality of first arm parts. The second sheet metal member includes a second central part and a plurality of second arm parts. Each of the rollers has a first end and a second end in an axial direction thereof. Each of the first arm parts and each of the second arm parts support the first end of one of two rollers adjacent to each other and the second end of the other of the two rollers adjacent to each other.

Drive disks are configured to rotate a main wheel by applying a frictional force thereto. Each of the drive disks includes a base and a plurality of rollers. The base includes a first sheet metal member and a second sheet metal member. The first sheet metal member includes a first central part and a plurality of first arm parts. The second sheet metal member includes a second central part and a plurality of second arm parts. Each of the rollers has a first end and a second end in an axial direction thereof. Each of the first arm parts and each of the second arm parts support the first end of one of two rollers adjacent to each other and the second end of the other of the two rollers adjacent to each other.

A propulsion device for a two-wheeled vehicle , in particular for an e-bike, includes: a mechanism for the bottom bracket, provided with cranks and pedals, suitable for providing traction to a rear wheel for manual advancement of the vehicle, a first epicyclic gear reducer coupled with the mechanism for the bottom bracket, drivable by a first control device configured for varying the geometric configuration of the first epicyclic gear reducer and thus the gear ratio, a motor for assisting pedalling interposed between the mechanism for the bottom bracket and the rear wheel, coupled with a second epicyclic gear reducer, drivable by a second control device configured for varying the geometric configuration of the second epicyclic gear reducer and thus the corresponding gear ratio, the second epicyclic gear reducer being coupled and directly in contact with the rear wheel, in order to transmit the movement from the propulsion device thereto.

A propulsion device for a two-wheeled vehicle , in particular for an e-bike, includes: a mechanism for the bottom bracket, provided with cranks and pedals, suitable for providing traction to a rear wheel for manual advancement of the vehicle, a first epicyclic gear reducer coupled with the mechanism for the bottom bracket, drivable by a first control device configured for varying the geometric configuration of the first epicyclic gear reducer and thus the gear ratio, a motor for assisting pedalling interposed between the mechanism for the bottom bracket and the rear wheel, coupled with a second epicyclic gear reducer, drivable by a second control device configured for varying the geometric configuration of the second epicyclic gear reducer and thus the corresponding gear ratio, the second epicyclic gear reducer being coupled and directly in contact with the rear wheel, in order to transmit the movement from the propulsion device thereto.

A kit of parts for converting a regular bicycle into an e-bike. The kit includes (i) an electric motive power unit having an external freewheeling sprocket drive assembly configured for demountable engagement with the bike's chain, (ii) a rechargeable battery and battery mount for providing electric power to the electric motive power unit, (iii) a mount bracket for demountably engaging therein the electric motive power unit and for demountably engaging there onto the battery mount, (iv) a power cable with an on/off switch and a demountable handlebar clamp for communication with the electric motive power unit, (v) a throttle control assembly configured for demountable engagement with the bike's handlebar; and (vi) a communication cable engagement with the throttle control assembly and the electric motive power unit and optionally, with a wheel sensor. The kit may additionally comprise a battery charger.

A method, system, apparatus, and/or device for propelling a non-motorized vehicle forward. The method, system, apparatus, and/or device may include a frame, a first wheel, a second wheel, a motor, a controller, and a bracket. The frame may attach to the first wheel, the second wheel, and the motor. The first wheel may attach to a first side of the frame and rotate about an axis. The second wheel may attach to a second side of the frame and rotate about the axis. The motor may connect to the first wheel, where the motor is configured to rotate the first wheel to propel the apparatus forward. The controller may control a speed at which the motor rotates the first wheel. The bracket may attach to a front of the first frame and connect to a non-motorized vehicle.