A ball type speed reducer includes: an eccentric disk cam that turns integrally with an input-side rotating body; a shaking body shaken by the eccentric disk cam; a plurality of balls supported by the shaking body; a fixing member; a first output-side rotating body facing one side face of the fixing member; and a second output-side rotating body facing the other side face of the fixing member. A plurality of radial grooves guide the ball along the radial direction in the fixing member. A corrugated groove spirally guiding the ball along the circumferential direction is formed across the first output-side rotating body and the second output-side rotating body. The groove depth at the top of a wave of the corrugated groove is greater than that at the bottom of the wave, in an alternating manner on the first output-side rotating body side and the second output-side rotating body side.

In a housing, accommodated are an internal gear, an external gear, an eccentric axis member and an Oldham coupling member. The external gear is arranged with a part of external teeth being meshed with the internal gear, and supported to be rotatable about an eccentric axis, which is offset by a predetermined distance from a rotation axis in parallel therewith on a plane including the rotation axis, and the Oldham coupling member has a guide hole receiving therein a barrel axis portion of the eccentric axis member, so that the barrel axis portion is supported to be rotatable in the guide hole. On a rotating surface of the external gear facing the Oldham coupling member, held are shaft members, about which slide members are supported to be rotatable, so that the Oldham coupling member is supported to be slidable relative to the external gear through the slide members.

A planetary gear train includes a central wheel, a gear and a carrier, geometrically coupled by a closed eccentric connection that locks the gear. The locking is provided by displacement of the carrier in relation to the gear in a circumferential or tangential direction, when the gear's rotation speed is lower than the carrier's rotation speed. When there is more than one locking gear, the carrier's displacement in relation to the gear can be identical or different. The eccentric connection can be designed as an eccentrically disposed projecting section of outer surface of either the gear or the carrier, conjugated with an opening or slot formed in the carrier or gear, or as an eccentric element having eccentrically disposed projecting sections that may be designed as a single rolling body. The gear train provides for locking (blocking) the gear, as well as for transmitting rotational movement thereby extending its use.

A lever apparatus includes a lever operated by a user, a biasing member that is a source of an operation reaction force of the lever, and a linkage mechanism configured to link the lever and the biasing member. The linkage mechanism includes a lever-side rotating body pivoted according to pivoting of the lever, and a biasing member-side rotating body engaged with lever-side rotating body and installed closer to the biasing member than the lever-side rotating body. The linkage mechanism varies a ratio of a variation of a rotation angle of the biasing member-side rotating body to a variation of a rotation angle of the lever-side rotating body according to an operation amount of the lever.

A wobble gear system is provided with an arrangement of gear elements that permits a motive input to drive planet gear elements to increase the gear reduction ratio while maximizing efficiency of the wobble gear system. The wobble gear system may have eccentrically rotating or oscillating wobble elements including a wobble plate and compound planet gear elements that are non-collinear and may be driven by the motive input, increasing the realized gear ratio in a single stage without reducing efficiency. One wobble gear system embodiment may employ a plurality of ring-supported and driven compound planet gear elements with laterally offset non-collinear central axes to optimize eccentricity and enhance gear reduction ratios. The wobble gear system may be integrated with components of a vehicle drive wheel driven by an in-wheel motor to produce speeds and torques required to drive vehicles including automobiles and aircraft.

A driving device includes: a first driving source; a second driving source; a first gear to which a driving force is transmitted from the first driving source; a second gear to which a driving force is transmitted from the second driving source; a third gear that engages with the first gear and the second gear; and a fixation shaft that pivotally supports the third gear, the fixation shaft being disposed such that a center of the fixation shaft, a rotation center of the first gear and a rotation center of the second gear are disposed on a straight line in which the fixation shaft is provided through the third gear; and a hole having a diameter for compensating eccentricity of the first gear, the second gear and the third gear is formed in the third gear.

A linear actuator is provided which includes a support structure having a first face, and a second face opposite the first face; a first rack secured to the first face; a second rack secured to the second face; a first compound gear and a second compound gear, and a drive gear engaged with the first input gear on a first side of the drive gear, and engaged with an idle gear on a second side of the drive gear, opposite the first side of the drive gear. The first and second compound gears are configured for a simultaneous linear motion in one of two opposing directions.

A bicycle crankset includes a chainring, a spider, and a crankarm. The chainring has a disk member and a plurality of teeth on an edge of the disk member to engage a chain. The spider is connected to the disk member of the chainring, and has a connecting bore and a plurality of recesses on an edge of the connecting bore. The crankarm has a plurality of protrusions to engage the recesses of the spider. The connecting bore is eccentric relative to the chainring, and the crankarm is able to be connected to the chainring in different angles by engaging the protrusions of the crankarm with different of the recesses of the spider to provide various paths of motion of the chainring.

A bearing section for a positive displacement mud motor for directional drilling in which the deflection of the drill bit is remotely adjusted by bending the drive sub using an offset flex drive mechanism to adjust between desired settings. The bearing section is adjustable from the surface without the need for trips of the bottom hole assembly to the surface.

The radial piston rotary device with compact gear drive mechanism includes a base, a casing mounted to the base, and a gearbox coupled to the casing. The casing houses a piston assembly with a pair of first radial pistons and a pair of second radial pistons coaxially mounted to the first radial pistons with each pair rotating at asynchronous, cyclically varying velocities. During a power cycle, a leading pair of radial pistons powers the associated gear assembly, and the gear assembly drives a flywheel assembly. A drive shaft axially extends from the flywheel assembly outside the gearbox to be selectively coupled to a driven component. The flywheel drives the pair of lagging radial pistons. During operation, each pair of radial pistons rotate at cyclically varying angular velocities out of phase with each other, yet produce a uniform output to the drive shaft.