A geared motor includes a pinion connected to a shaft in a positive manner. A pinion tooth system of the pinion meshes with a tooth system of a gear wheel. In relation to the axis of rotation of the gear wheel, the contact region between the pinion and the shaft radially overlaps, e.g., truly overlaps, with the meshing region, e.g., the tooth system with the pinion tooth system.

In an internal combustion engine, first and second rotating members, one for the intake valve and one for the exhaust valve rotate next to the outside of an engine cylinder on opposite sides thereof when driven by a drive gear attached to the end of the engine's crankshaft. Each rotating member may include a ring gear having a valve port or aperture near its perimeter that cyclically aligns with a corresponding valve port formed through the cylinder wall near the top of the cylinder. A method of controlling valve timing comprises the steps of causing the rotating member containing the second valve port to periodically align in synchronism with the first port to control the passage of an air/fuel mixture and exhaust gases through the combustion cycles of the engine.

In an internal combustion engine, first and second rotating members, one for the intake valve and one for the exhaust valve rotate next to the outside of an engine cylinder on opposite sides thereof when driven by a drive gear attached to the end of the engine's crankshaft. Each rotating member may include a ring gear having a valve port or aperture near its perimeter that cyclically aligns with a corresponding valve port formed through the cylinder wall near the top of the cylinder. A method of controlling valve timing comprises the steps of causing the rotating member containing the second valve port to periodically align in synchronism with the first port to control the passage of an air/fuel mixture and exhaust gases through the combustion cycles of the engine.

A transmission device includes an external transmission device, an internal transmission device, and a spacer ring. The external transmission device is cylindrical and has an outer wall and an inner wall. The inner wall has a plurality of inwardly extending arc-shaped protrusions. The internal transmission device is disposed in the inner wall and has an outer circumferential surface including a plurality of outwardly extending arc-shaped protrusions. The spacer ring is located between and contacts the arc-shaped protrusions of the external transmission device and the arc-shaped protrusions of the internal transmission device. When torque between the external transmission device and the internal transmission device is greater than a predetermined torque, one or more of the arc-shaped protrusions of the external transmission device or the arc-shaped protrusions of the internal transmission device deform and the external transmission device rotationally slips relative to the internal transmission device.

The invention relates to a planar spiral gearbox, in particular for use in a door system, comprising: a gear, in particular a scroll plate, having a planar side on which a spiral toothed arrangement is arranged having at least one tooth that has a spiral tooth progression; and a cylindrical gear, in particular a torus gear, that has an external toothed arrangement at its jacket surface, wherein the spiral toothed arrangement of the gear is in meshing engagement with the external toothed arrangement of the cylindrical gear, with the gear having at least one additional toothed arrangement section that is radially spaced apart from an axis of rotation of the gear and serves for engagement of a drive toothed arrangement.

A gear train (4) for a valve actuator (1) includes a motor (2) and a valve shaft (3), and is configured to rotationally couple the motor to the valve shaft. The gear train includes a motor gear (7) attachable to a motor shaft (5), and a face gear (8) mountable such that a rotational axis (9) of the face gear is perpendicular to a rotational axis (6) of the motor. The face gear includes an axially directed face gear portion (10) for engaging the motor gear. The gear train also includes an output gear (20) attachable to the valve shaft. The output gear and valve shaft are mountable such that a rotational axis (21) of the output gear is parallel to the rotational axis of the face gear. The gear train also includes a pinion gear arrangement configured to rotationally couple the face gear to the output gear.

A harmonic drive system for a pedal-electric-cycle comprises a transmission gear device including a wave generator assembled by an elliptical cam and a flexible bearing, a flexible-flexspline, a rigid-circular-spline having rigid-circular-spline internal gear teeth, a gear set, and a one-way clutch having an inner surface defining a space for containing a spindle of the pedal-electric-cycle. A first end of the flexible-flexspline has flexible-flexspline external gear teeth for meshing with the rigid-circular-spline internal gear teeth and an inner surface defining a space for containing the wave generator. The gear set has a first input portion connected to a second end of the flexible-flexspline, a second input portion having an inner surface defining a space for containing the one-way clutch, and an output portion connected to a sprocket of the pedal-electric-cycle. The first input portion has a first-input rotational axis. The second input portion has a second-input rotational axis.

A gear drive, such as for an actuator, is a right-angle drive where toothed outer ridge of a face gear is coupled to teeth of a motor output shaft, and a set of planetary gears are engaged with a central sun gear of the face gear. The sun gear and planetary gears are aligned with the motor output shaft. For instance the motor output shaft may be substantially in the same plane with the sun gear and the planetary gears. From another standpoint the axis of the motor output shaft may intersect the sun gear, as well as intersecting a volume that the planetary gears sweep through as the planetary gears engage the sun gear.

A gear drive, such as for an actuator, is a right-angle drive where toothed outer ridge of a face gear is coupled to teeth of a motor output shaft, and a set of planetary gears are engaged with a central sun gear of the face gear. The sun gear and planetary gears are aligned with the motor output shaft. For instance the motor output shaft may be substantially in the same plane with the sun gear and the planetary gears. From another standpoint the axis of the motor output shaft may intersect the sun gear, as well as intersecting a volume that the planetary gears sweep through as the planetary gears engage the sun gear.

A linkage-based shifting assembly comprises first and second arms, having a first wheel rotatably coupled to a proximal end of the first arm and a second wheel rotatably coupled to a proximal end of the second arm. A shifting assembly is configured to couple to a chassis, wherein the shifting assembly is coupled to distal ends of the first and second arms and configured to cause a relative shifting motion between the chassis and the first and second wheels. The linkage-based shifting assembly can form part of a vehicle. The vehicle can be a two-wheeled vehicle. The vehicle can be a mobile carrier. The mobile carrier can be a two-wheeled vehicle.