A pedaling vibrational apparatus includes a seat body, a pedal assembly, a gear plate assembly, a drive assembly and an eccentric assembly, like a lever structure. By treading the pedal assembly, the gear plate assembly drives the drive assembly to rotate. The drive assembly is connected with the eccentric assembly. A user can fully exercise muscles of the user's body during exercise, and a vibrational effect generated by the eccentric assembly can stimulate acupuncture points of the user's body to improve blood circulation. Left and right pedals of the pedal assembly can be treaded in turn to continuously drive a gear to rotate in a same direction so as to achieve an effect of acceleration and to enhance vibrations.

A gear includes a circular base having a front surface that includes an inner region and an outer region that surrounds the inner region. The circular base is rotatable about a central axis. Plural gear teeth are arranged in a same row and extend outward from the outer region of the front surface and are evenly spaced from each other along plural locations on the outer region. Each gear tooth has a cross-sectional width that decreases with decreasing distance from the central axis, and has an outer shape configured to permit any one of the gear teeth in the row to contact and directly mesh with any gear tooth in a corresponding row of gear teeth of a substantially identical gear for any gear angle within a predefined range of gear angles between the central axis of the gear and the central axis of the substantially identical gear.

A window shade system includes a first bracket coupled to a first pivot and rotatable at least within a first range of angles, a second bracket coupled to a second pivot and rotatable at least within a second range of angles, and first and second gears that each include a circular base rotatable about a central axis. Gear teeth are arranged in a same row and extend outward from the outer region and are evenly spaced from each other along the outer region of the gears. The first and second pivots are arranged relative to each other and relative to the central axes of the first and second gears, respectively, such that for any angle within the first range of angles, the gear tooth of the first gear meshes with the gear tooth of the second gear at a corresponding angle within the second range of angles.

Powered limb prostheses with multi-stage transmissions are provided.

A mechanical device lubrication level control system operates within a mechanical housing having a sump cavity and a lubricant director, where the lubricant director is located at the bottom of the housing. A mechanical gear set is located in the sump cavity and a lube tank is located in the lubricant director. There is located within in lube tank either a motor with a pump or an expandable air bladder that is inflatable by an air source. For the lube tank having the motor with the pump, the pump controls the lubricant within the sump cavity. For the lube tank having the expandable air bladder, the air source controls the lubricant within the sump cavity.

A mechanical device lubrication level control system operates within a mechanical housing having a sump cavity and a lubricant director, where the lubricant director is located at the bottom of the housing. A mechanical gear set is located in the sump cavity and a lube tank is located in the lubricant director. There is located within in lube tank either a motor with a pump or an expandable air bladder that is inflatable by an air source. For the lube tank having the motor with the pump, the pump controls the lubricant within the sump cavity. For the lube tank having the expandable air bladder, the air source controls the lubricant within the sump cavity.

An involute gear bracket system includes first and second involute gears. Each includes a circular base and a plurality of gear teeth extending outward from an outer region of a surface and evenly spaced apart from each other along a plurality of locations on the outer region of the surface. The shape of each gear tooth is defined by a varying cross-sectional involute profile, wherein starting from a first involute profile that is in a plane parallel to the surface of the circular base and extending outward from a center of the circular base, each location on the first involute profile is rotated about a corresponding axis while traversing a path defined by a corresponding imaginary ray extending from the center of the circular base to that location, the corresponding axis being tangential to an imaginary circle that encompasses the inner region of the surface and perpendicular to the corresponding imaginary ray. A first bracket is coupled to a first pivot located at a first distance from the central axis of the first involute gear. A second bracket is coupled to a second pivot and rotatable about the second pivot at least within a second range of angles. The first and second pivots are arranged relative to each other and relative to the central axes of the first and second involute gears, respectively, such that the gear tooth of the first involute gear meshes with the gear tooth of the second involute gear at a corresponding angle within a second range of angles.

The invention relates to a method for engaging a first gear element with a second gear element, at least the second gear element being mounted to be mobile between a meshing position and a position of disengagement using an actuator. The method comprises the step of driving at least one of the gear elements in rotation to form a non-zero rotation speed difference between said gear elements and the step of controlling the actuator to successively: displace at least the second gear element to the meshing position, when an intermediate position of the second gear element is detected, stop the displacement of the second gear element, when an angular position of engagement of said gear elements is detected, displace the second gear element to the meshing position.

The embodiments relate to devices for coupling, in particular the recoupling an output shaft with an epicyclic gearbox in a gas turbine engine, wherein an axial coupling action between the output shaft and the epicyclic gearbox is generatable through an oil pump and transmitted through an oil transfer coupling. Embodiments also relate to a method for coupling and a gas turbine engine.

The invention relates to a stabilization bearing system for a geared turbofan engine, in particular an aircraft engine, with a stabilization bearing for an input shaft device to an epicyclic gearbox device of the geared turbofan engine, the stabilization bearing being located axially in front of an input shaft device location bearing system.