A gear structure includes at least one return wheel unit (1) and a power transmission unit (2). The at least one return wheel unit includes a first wheel (12) having a first gear (123), a second wheel (13) having a second gear (133), and a spring (14) mounted between the first wheel and the second wheel. The power transmission unit includes a first driven gear set (22), a second driven gear set (23) and a transmission member (24). The first driven gear set has a third gear (222) and a first bevel gear (223). The third gear meshes with the second gear. The second driven gear set has a second bevel gear (232) meshing with the first bevel gear. The transmission member is connected between the driving member and the second driven gear set.

An epicyclic gear system features a cylindrical flywheel with a flywheel cavity, a plurality of mounting pillars, an annular ring gear mounted on the mounting pillars, and an annular sun gear mounted to and extending from the flywheel cavity. The epicyclic gear system has a planet carrier mounted to an axle shaft and a planet gear mounted to the planet carrier. The axle shaft passes through an axle aperture, a ring gear aperture, and a sun gear aperture. The planet gear engages the ring gear and the sun gear to provide a desired gear ratio for rotating the flywheel via rotation of the axle shaft, the planet carrier, the planet gear, and the sun gear.

A recoil starter (103) includes a pull rope reel (22), a ratchet wheel (31), a pulley (32), a ratchet pawl (33), and an outer wall (32e). The ratchet pawl (33) is capable of swinging between an engaged position where the ratchet pawl engages with a protruding part (31a) and a disengaged position where the ratchet pawl does not engage with the protruding part, and is always urged toward the engaged position. A support surface (32d) of the outer wall (32e) supports the base end portion of the ratchet pawl (33) when the ratchet pawl (33) is in the engaged position. The internal space of the pulley (32) and the external space of the pulley (32) are communicate with each other through the foreign matter discharge portion (32f) of the outer wall (32e).

A recoil starter (103) includes a pull rope reel (22), a ratchet wheel (31), a pulley (32), a ratchet pawl (33), and an outer wall (32e). The ratchet pawl (33) is capable of swinging between an engaged position where the ratchet pawl engages with a protruding part (31a) and a disengaged position where the ratchet pawl does not engage with the protruding part, and is always urged toward the engaged position. A support surface (32d) of the outer wall (32e) supports the base end portion of the ratchet pawl (33) when the ratchet pawl (33) is in the engaged position. The internal space of the pulley (32) and the external space of the pulley (32) are communicate with each other through the foreign matter discharge portion (32f) of the outer wall (32e).

Rotational inerters are described herein that can provide torque applications in response to a rotation component. The inerter can include a first shaft having a first longitudinal axis and a second shaft having a second longitudinal axis. A first gear can be connected with the first shaft and a second gear can be connected with the second shaft. The first and second gears can be in meshing engagement with one another. In some arrangements, the first gear can be a worm gear and the second gear can be a worm. A flywheel can be connected with the second shaft. Rotation of the first shaft can cause the second shaft to rotate. Arrangements described herein can cause a torque to be applied at the first shaft that is proportional to a rate of change of the angular velocity of the first shaft about the first longitudinal axis.

Rotational inerters are described herein that can provide torque applications in response to a rotation component. The inerter can include a first shaft having a first longitudinal axis and a second shaft having a second longitudinal axis. A first gear can be connected with the first shaft and a second gear can be connected with the second shaft. The first and second gears can be in meshing engagement with one another. In some arrangements, the first gear can be a worm gear and the second gear can be a worm. A flywheel can be connected with the second shaft. Rotation of the first shaft can cause the second shaft to rotate. Arrangements described herein can cause a torque to be applied at the first shaft that is proportional to a rate of change of the angular velocity of the first shaft about the first longitudinal axis.

A mechatronic transmission for transmitting a torque from the drive shaft that can be supported axially on a shaft to an output shaft, the rotational speeds of which can have an arbitrary and variable ratio (stepless transmission). The transmission includes a coupling gear and a torsion spring, with the coupling gear rotatably mounted on the same shaft and connected to the output shaft by the torsion spring, and having a first coupling for producing and cancelling a rotationally fixed, planar, force-fitting first coupling between the drive shaft and the coupling gear. The transmission comprises a supporting device which is rotatable having a fixed transmission ratio of 1:X relative to the output shaft, where X can be any real number between approximately 10 and 1, and a second coupling for producing and cancelling a rotationally fixed, force-fitting second coupling between the supporting device and the coupling gear.

A rotation pulsation generating mechanism includes a drive motor, a transmission coupled between the drive motor and a rotation target, a cam fixed to a rotary shaft between the drive motor and the transmission so as be rotated by the drive motor, and a cam follower biased so as to press the cam. The cam pressed by the cam follower is rotated by the drive motor so as to generate rotation pulsation according to a rotational speed of the drive motor, and the rotational speed of the drive motor is changed by the transmission to a rotational speed of the rotation target different from that of the drive motor, so that a given order of rotation pulsation is applied to the rotation target.

Disclosed herein is a vehicular seat back table apparatus including: a guide member installed at each of both sides of a table installation space of a backrest and including a rack gear portion; a driving shaft at which a pinion rotatably, which is installed at a guide frame and engaged with the rack gear portion of the guide member, is installed; a driving unit rotated by a rotation varying unit connected to the driving shaft, installed at a side surface of a table, and including a rotating hinge shaft member configured to provide a rotational force to rotate the table when the pinion is moved along the rack gear portion; and an elastic bias portion configured to support the guide frame to move upwardly along the guide member.

A power converting apparatus that may increase a generation efficiency by receiving a power from a power source, producing electricity by rotating an output shaft connected to a generator using a portion of the received power, accumulating a remaining portion of the received power in an energy storage device, and rotating the output shaft using the accumulated energy when a power is not transmitted from the power source, the power source that floats in the ocean, performs irregular motions in vertical and horizontal directions by waves within a predetermined range, and generates an intermittent linear power, is provided.