Abstract

The invention relates to an electric drive device (1) for a bike (2), the drive device (1) comprising: a transmission element (4), comprising an endless loop (6); a first sprocket (8) and a second sprocket (10), which are configured to engage with the transmission element (4), an electric motor (12) connected to the first sprocket (8) or the second sprocket (10), and which electric motor (12) is configured to rotate the first sprocket (8) or the second sprocket (10) and to cause a rotational motion of the transmission element (4); a hub wheel (14) configured to be connected to a drive wheel (16) of the bike (2), and which hub wheel (14) is configured to be driven by the transmission element (4). The hub wheel (14) is configured to engage with an outside (18) of the endless loop (6) of the transmission element (4). The invention further relates to a bike (2).

IPC Classes  ?

• B62M 6/40 - Rider propelled cycles with auxiliary electric motor
• B62M 6/75 - Rider propelled cycles with auxiliary electric motor power-driven by friction rollers or gears engaging the ground wheel
• B62M 13/00 - Transmissions characterised by use of friction rollers engaging the periphery of the ground wheel

Abstract

The present invention relates to an electric drive system for a bike comprising a portable electric friction drive device and a bike bracket. A first drive device attachment point is located at a rear part of the friction drive device. A second drive device attachment point is located between the front part of the friction drive device and the rear part of the friction drive device. An inclination control arrangement is configured to control the inclination of the imaginary line between the second drive device attachment point and a contact point of the drive wheel by adjusting the tilt of the friction drive device over the second drive device attachment point. The bike has at least one wheel, comprising the electric drive system, wherein the drive wheel is arranged to be contactable to the tire of said wheel at said contact point.

IPC Classes  ?

• B62M 6/75 - Rider propelled cycles with auxiliary electric motor power-driven by friction rollers or gears engaging the ground wheel
• B62M 6/90 - Batteries
• B62M 13/04 - Transmissions characterised by use of friction rollers engaging the periphery of the ground wheel with means for moving roller into driving contact with ground wheel
• B62M 6/50 - Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof