A friction roller-type reduction gear includes a sun roller arranged concentrically with an input shaft, a ring roller having a stationary ring roller element and a moveable ring roller element, a plurality of intermediate rollers configured to be in rolling contact with an outer peripheral surface of the sun roller and an inner peripheral surface of the ring roller, a coupling part configured to couple the ring roller and the output shaft, and a loading cam mechanism having a cam ring and configured to change a contact surface pressure of each rolling contact surface. The outer peripheral surface of the sun roller is a concave curved surface of which a shape of an outer edge in an axial cross-section is a single circular arc-shaped concave curve, and an outer peripheral surface of the intermediate roller is a convex curved surface of which a shape of an outer edge in an axial cross-section is a single circular arc-shaped convex curve.

The present disclosure includes a transmission comprising a first wheel assembly including a first wheel, a first drive gear coupled to the first wheel such that driving the first drive gear causes a corresponding rotation of the first wheel, and a first motor coupled to the first drive gear to drive the first drive gear. The transmission also includes a second wheel assembly that includes, a second wheel, a second drive gear coupled to the second wheel such that driving the second drive gear causes a corresponding rotation of the second wheel, and a second motor coupled to the second drive gear to drive the second drive gear.

The present disclosure includes a transmission comprising a first wheel assembly including a first wheel, a first drive gear coupled to the first wheel such that driving the first drive gear causes a corresponding rotation of the first wheel, and a first motor coupled to the first drive gear to drive the first drive gear. The transmission also includes a second wheel assembly that includes, a second wheel, a second drive gear coupled to the second wheel such that driving the second drive gear causes a corresponding rotation of the second wheel, and a second motor coupled to the second drive gear to drive the second drive gear.

A speed changer includes an inner ring, an outer ring, a plurality of first tapered rollers provided in an annular space between inner ring and outer ring on one side in an axial direction, annular first cage that holds the first tapered rollers, a plurality of second tapered rollers provided in the annular space on the other side in the axial direction, and an annular second cage that holds the second tapered rollers. The first cage is a fixed member that is not allowed to rotate around a center line of the annular space. The outer ring is an input member to which a rotation torque is input. The second cage is an output member that outputs rotation resulting from reduction in a speed of the input. A first rotating portion including the first tapered rollers is different in specifications from a second rotating portion including the second tapered rollers.

A speed changer includes an inner ring, an outer ring, a plurality of first tapered rollers provided in an annular space between inner ring and outer ring on one side in an axial direction, annular first cage that holds the first tapered rollers, a plurality of second tapered rollers provided in the annular space on the other side in the axial direction, and an annular second cage that holds the second tapered rollers. The first cage is a fixed member that is not allowed to rotate around a center line of the annular space. The outer ring is an input member to which a rotation torque is input. The second cage is an output member that outputs rotation resulting from reduction in a speed of the input. A first rotating portion including the first tapered rollers is different in specifications from a second rotating portion including the second tapered rollers.

An auxiliary machine-driving device has a first idler roller having an outer peripheral surface biased into contact with the outer peripheral surfaces of a motor/generator roller and an engine roller, a second idler roller having an outer peripheral surface biased into contact with the outer peripheral surfaces of the engine roller and a rotating roller, and a third idler roller having an outer peripheral surface biased into contact with the outer peripheral surfaces of the rotating roller and the motor/generator roller. When the engine starts, the engine is started by transmitting the driving force of the motor/generator to the engine via the motor/generator roller, the first idler roller and the engine roller. After the engine starts, power is generated from the driving force of the engine being transmitted to the motor/generator via the engine roller, the second idler roller, the rotating roller, the third idler roller and the motor/generator roller.

An auxiliary machine-driving device has a first idler roller having an outer peripheral surface biased into contact with the outer peripheral surfaces of a motor/generator roller and an engine roller, a second idler roller having an outer peripheral surface biased into contact with the outer peripheral surfaces of the engine roller and a rotating roller, and a third idler roller having an outer peripheral surface biased into contact with the outer peripheral surfaces of the rotating roller and the motor/generator roller. When the engine starts, the engine is started by transmitting the driving force of the motor/generator to the engine via the motor/generator roller, the first idler roller and the engine roller. After the engine starts, power is generated from the driving force of the engine being transmitted to the motor/generator via the engine roller, the second idler roller, the rotating roller, the third idler roller and the motor/generator roller.

A steering wheel controller is mountable to a steering wheel of a vehicle having a steering wheel axis and rim, the steering wheel rim having hand gripping surfaces that face away from the steering wheel axis. The steering wheel controller includes a steering wheel mount, a wheel ring, and at least one ring driver. The steering wheel mount is securable to the steering wheel without obstructing the hand gripping surfaces. The wheel ring is connected to the steering wheel mount, and defines a wheel ring axis of rotation. When the steering wheel mount is secured to the steering wheel, the wheel ring is located rearward of the steering wheel. The at least one ring driver is engageable with the wheel ring, and when engaged with the wheel ring controllable to selectively torque the wheel ring to rotate with the steering wheel mount about the wheel ring axis of rotation.

A steering wheel controller is mountable to a steering wheel of a vehicle having a steering wheel axis and rim, the steering wheel rim having hand gripping surfaces that face away from the steering wheel axis. The steering wheel controller includes a steering wheel mount, a wheel ring, and at least one ring driver. The steering wheel mount is securable to the steering wheel without obstructing the hand gripping surfaces. The wheel ring is connected to the steering wheel mount, and defines a wheel ring axis of rotation. When the steering wheel mount is secured to the steering wheel, the wheel ring is located rearward of the steering wheel. The at least one ring driver is engageable with the wheel ring, and when engaged with the wheel ring controllable to selectively torque the wheel ring to rotate with the steering wheel mount about the wheel ring axis of rotation.

An auxiliary machine-driving device has a first idler roller having an outer peripheral surface biased into contact with the outer peripheral surfaces of a motor/generator roller and an engine roller, a second idler roller having an outer peripheral surface biased into contact with the outer peripheral surfaces of the engine roller and a rotating roller, and a third idler roller having an outer peripheral surface biased into contact with the outer peripheral surfaces of the rotating roller and the motor/generator roller. When the engine starts, the engine is started by transmitting the driving force of the motor/generator to the engine via the motor/generator roller, the first idler roller and the engine roller. After the engine starts, power is generated from the driving force of the engine being transmitted to the motor/generator via the engine roller, the second idler roller, the rotating roller, the third idler roller and the motor/generator roller.