A motorcycle includes an electric motor having an output shaft defining a motor axis, a rear wheel drivably coupled to the electric motor to propel the motorcycle, a swingarm rotatably supporting the rear wheel, and a frame. The frame includes a main frame member supporting the electric motor and the swingarm. A case of the electric motor is a stressed member of the frame between the main frame member and the swingarm. The swingarm is coupled to the case of the electric motor to define a swingarm pivot axis that is co-axial with the motor axis.

A pump-action mobility and exercise device may include a pumping arm attached to a foot slide. As the pumping arm is actuated, the foot slide moves forward and rearward in response to the pumping action. The foot slide can also be moved by a user's foot movement. The foot slide may be connected to a drive mechanism that selectively engages a chain or belt that loops around a drive wheel arranged on an axle of the vehicle. When the drive mechanism catches and moves the belt or chain in a forward direction, the axle rotates in a forward direction to drive the vehicle forward. A reverse mechanism may also be provided that selectively causes the drive mechanism to catch and drive the belt or chain in an opposite direction.

A pump-action mobility and exercise device may include a pumping arm attached to a foot slide. As the pumping arm is actuated, the foot slide moves forward and rearward in response to the pumping action. The foot slide can also be moved by a user's foot movement. The foot slide may be connected to a drive mechanism that selectively engages a chain or belt that loops around a drive wheel arranged on an axle of the vehicle. When the drive mechanism catches and moves the belt or chain in a forward direction, the axle rotates in a forward direction to drive the vehicle forward. A reverse mechanism may also be provided that selectively causes the drive mechanism to catch and drive the belt or chain in an opposite direction.

A drivetrain assembly comprises a bottom bracket shell defining a front axis, a dropout defining a rear axis, a chainstay member attached to the dropout and the bottom bracket shell, a front sprocket and a rear sprocket, and a chain or belt including a bottom section extending from a first contact point between the chain or belt and the front sprocket to a second contact point between the chain or belt and the rear sprocket. The chainstay member fixes the dropout relative to the bottom bracket shell, such that a chainstay length is non-variable, and such that the chain or belt has a predetermined tension defined by a midpoint of the bottom section being vertically displaceable only by a maximum vertical extent within a predetermined range upon application of a predetermined load at the midpoint of the bottom section.

A drivetrain assembly comprises a bottom bracket shell defining a front axis, a dropout defining a rear axis, a chainstay member attached to the dropout and the bottom bracket shell, a front sprocket and a rear sprocket, and a chain or belt including a bottom section extending from a first contact point between the chain or belt and the front sprocket to a second contact point between the chain or belt and the rear sprocket. The chainstay member fixes the dropout relative to the bottom bracket shell, such that a chainstay length is non-variable, and such that the chain or belt has a predetermined tension defined by a midpoint of the bottom section being vertically displaceable only by a maximum vertical extent within a predetermined range upon application of a predetermined load at the midpoint of the bottom section.

Disclosed herein is an assembly, method of assembling, and kit for assembling an assembled flexible helical belt that is mounted within a mounting space defined by a continuous mechanical constraint of a device. Embodiments of the flexible helical belt include a flexible helical belt that has a plurality of belt teeth, where some of the belt teeth are each pierced by a through hole which extends through the respective belt tooth and where the flexible helical belt is of sufficient length such that, when the flexible helical belt is mounted within the intended mounting space, the flexible helical belt overlaps itself by at least one rotation such that each through hole is transversely aligned with at least one other through hole, enabling a transverse compression device to be fitted through the through holes, creating a transverse compressive force on the flexible helical belt to form a single continuous drive belt.

An exercise device for performing exercises suitable to strengthen thigh and hip muscles such as a leg press machine, a total hip, a stationary bicycle, or a moving bicycle, and more particularly provides an exercise device for strengthening thigh and hip muscles while protecting the knees and ankle joints by enabling a user to locate a lower end of an arm on the user's thighs in a sitting, prone or supine position and move the user's legs in order to minimize a load or stress added to the knee and ankle joints.

An exercise device for performing exercises suitable to strengthen thigh and hip muscles such as a leg press machine, a total hip, a stationary bicycle, or a moving bicycle, and more particularly provides an exercise device for strengthening thigh and hip muscles while protecting the knees and ankle joints by enabling a user to locate a lower end of an arm on the user's thighs in a sitting, prone or supine position and move the user's legs in order to minimize a load or stress added to the knee and ankle joints.

A vehicle propulsion system for maximizing power output, comprising: a frame; a first crankset and second crankset securably attached to the frame; a first sprocket wheel and second sprocket wheel attached to the first crankset and second crankset; a first pedal arm and second pedal arm attached to the first crankset and second crankset each having a pedal; a first chain and second chain disposed on the first sprocket wheel and second sprocket wheel, and the chain connecting to a wire on one end and a spring and wire on the other end; and a series of springs and wires attached to the distal ends of the first chain and second chain and disposed on a series of pulleys and sprockets.

A rear drive transmission system for a motorcycle includes a driving wheel, a center wheel, and a driven wheel. The center wheel includes a transmission wheel A and a transmission wheel B that are coaxially arranged. The transmission wheel A is fixedly connected to an opposite surface of the transmission wheel B. The driving wheel is drivingly connected to the transmission wheel B. The transmission wheel A is drivingly connected to the driven wheel, and the driving wheel is detachably and fixedly connected to an output shaft of a motor or engine. The driven wheel is detachably connected with a rear wheel shaft of the motorcycle. The center wheel is rotatably connected with a rear fork rotation center shaft through a bearing. The motorcycle is with the motorcycle rear drive transmission system.