Electic motor driven wheel
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorJunji Terada
Life of this patent
Estimating the term…
Abstract
A motor scooter embodying an improved electric motor driven wheel. The electric motor for driving the wheel is quite compact and is designed so as to be nested within the disk of the wheel. The motor controller is mounted adjacent the wheel in a protected area but is cooled by airflow across it and by heat transfer to the motor housing. Oil in the motor assembly also will cool the controller. A two speed planetary gear transmission is employed that also is compact and can be nested easily within portions of the electric motor. In addition, an improved brake assembly is also mounted integrally within the motor driving mechanism.
Claims35
An electric motor arrangement for driving an associated, juxtaposed wheel, said electric motor comprising a rotor and a stator supported for relative rotation, one of said rotor and said stator carrying a plurality of spaced permanent magnets, the other of said rotor and said stator carrying a plurality of coil windings juxtaposed to said permanent magnets for effecting rotation of said rotor, a motor cover enclosing said rotor and said stator and adapted to extend at least in part into the associated wheel, a wheel driving shaft driven by said rotor and having an end portion extending through an opening in said motor cover for driving the associated wheel, said motor cover opening being surrounded by a disk shaped portion, and a controller for controlling the supply of electrical power to said coils mounted on the side of said disk shaped portion through which said wheel driving shaft extends.
An electric motor arrangement for driving an associated, juxtaposed wheel, said electric motor comprising a rotor and a stator supported for relative rotation, one of said rotor and said stator carrying a plurality of spaced permanent magnets, the other of said rotor and said stator carrying a plurality of coil windings juxtaposed to said permanent magnets for effecting rotation of said rotor, said rotor being comprised of a cup shaped member having a cylindrical portion closed at one end by a circular end wall through which a wheel driving shaft passes for driving the associated wheel, a first reduction gear set on one side of said circular end wall for driving said wheel driving shaft from said rotor at a first speed ratio and disposed axially within said cylindrical portion, and a second reduction gear set on the other side of said circular end wall for driving said wheel driving shaft from said rotor at a second speed ratio different from said first speed ratio.
An electric motor arrangement for driving an associated, juxtaposed wheel, said electric motor comprising a rotor and a stator supported for relative rotation, one of said rotor and said stator carrying a plurality of spaced permanent magnets, the other of said rotor and said stator carrying a plurality of coil windings juxtaposed to said permanent magnets for effecting rotation of said rotor, a motor cover enclosing said rotor and said stator and adapted to extend at least in part into the associated wheel, a wheel driving shaft driven by said rotor and having a first end portion extending through an opening in one side of said motor cover for driving the associated wheel, said wheel driving shaft having a second end portion extending through an opening in the other side of said motor cover, and a braking device associated with said wheel driving shaft second end portion for braking the rotation of said wheel driving shaft and the associated wheel.
Dependencies are inferred from the claim text.