The present application relates to a divided gear wheel 100, 200, for an automatic power transmission system 1, to an automatic power transmission system and a method to operate said automatic power transmission system. The automatic power transmission system comprises at least one divided gear wheel that comprises an inner part 130, 230, being engageable with a shaft and an outer part 110, 210, comprising teeth, adapted for torque transmission to another gear wheel. The inner part and the outer part have a common rotational axis, and the inner part is at least partially arranged within the outer part. Further, the inner part is coupled to the outer part by means of two elastic elements, so that the inner part is arranged angularly deflectable with respect to the outer part around the common rotational axis. The inner part and the outer part are adapted to rotate with the same angular speed if the elastic elements are fully loaded.

A gear assembly comprising first and second gears configured to mesh with each other, the first gear comprising inner and outer ring elements and a resilient ring element disposed between and coupled to the inner and outer ring elements, the outer ring element comprising first gear teeth which mesh with second gear teeth of the second gear, wherein the first and second gears each comprise a positioning ring axially spaced apart from the first and second gear teeth, the positioning rings being configured to engage each other and limit the position of the first and second gear teeth relative to each other.

A gear assembly comprising first and second gears configured to mesh with each other, the first gear comprising inner and outer ring elements and a resilient ring element disposed between and coupled to the inner and outer ring elements, the outer ring element comprising first gear teeth which mesh with second gear teeth of the second gear, wherein the first and second gears each comprise a positioning ring axially spaced apart from the first and second gear teeth, the positioning rings being configured to engage each other and limit the position of the first and second gear teeth relative to each other.

A torque transfer device has a ring gear and inner and outer planet gear sets, which may not be orbiting but rotating in fixed positions relative to a housing. One of the gear sets may comprise compound gears. There may also be a sun gear connected to a planet gear set. The sun gear may be an input and the ring gear an output for a reducing gear system to act as a torque amplifier. The gears may be tapered and there may also be an axial force applied to one of the gear sets to tighten the meshing between the tapered gears. One of the gear sets, for example a gear set to which an axial force is applied, may be floating.

A controller determines a compensation factor from an operating amount of an accelerator operating member and a hydraulic pressure of at least one of a first circuit and a second circuit. The controller determines a target vehicle speed from the operating amount of the accelerator operating member. The controller determines at least one of a target displacement of a travel pump and a target displacement of a travel motor from the target vehicle speed and the compensation factor.

A scissor gear oil supplying structure includes: a scissor gear that is provided on an outer the circumference of a tip end portion of a shaft; a first oil passage; a second oil passage that extends from the first oil passage in the radial direction; an extension hole that is opened at the front end surface of the shaft; a female screw that is formed in the first oil passage on the rear side of the second oil passage; a rotating member; and a bolt that is inserted into the extension hole and the first oil passage to fasten the rotating member to the shaft and is screwed into the female screw, in which lubricating oil is guided from the first oil passage to the second oil passage along a gap between thread grooves of the female screw and thread ridges of the bolt.

A scissor gear oil supplying structure includes: a scissor gear that is provided on an outer the circumference of a tip end portion of a shaft; a first oil passage; a second oil passage that extends from the first oil passage in the radial direction; an extension hole that is opened at the front end surface of the shaft; a female screw that is formed in the first oil passage on the rear side of the second oil passage; a rotating member; and a bolt that is inserted into the extension hole and the first oil passage to fasten the rotating member to the shaft and is screwed into the female screw, in which lubricating oil is guided from the first oil passage to the second oil passage along a gap between thread grooves of the female screw and thread ridges of the bolt.

An electromagnetic actuator having a speed reducer has a stator and a rotor arranged to move rotationally relative to the stator. A drive gear is fixed to the rotor. At least three planetary gears are mounted on the stator and each of the at least three planetary gears are engaged by the drive gear. An annular gear is rotationally mounted on the first stator the annular gear is engaged by each of the at least three planetary gears.

An opposed-piston engine includes at least two of: a gear train with a backlash reducing means; a viscous damper; and a centrifugal pendulum absorber. The opposed-piston engine can include two crankshafts and a gear train to connect the crankshafts. Any viscous dampers and centrifugal pendulum absorbers can be used to mitigate torsional velocity fluctuations in crankshafts in the engine, and multiple viscous dampers and/or centrifugal pendulum absorbers can be used in an engine. The backlash reducing means can include any of a means to adjust the position of gears in a gear train relative to each other and one or more backlash reducing gears.

An opposed-piston engine includes at least two of: a gear train with a backlash reducing means; a viscous damper; and a centrifugal pendulum absorber. The opposed-piston engine can include two crankshafts and a gear train to connect the crankshafts. Any viscous dampers and centrifugal pendulum absorbers can be used to mitigate torsional velocity fluctuations in crankshafts in the engine, and multiple viscous dampers and/or centrifugal pendulum absorbers can be used in an engine. The backlash reducing means can include any of a means to adjust the position of gears in a gear train relative to each other and one or more backlash reducing gears.