In a vehicular power transmitting system, a fixing portion of a brake retaining portion receives a reaction force from a reverse drive brake and is located in a portion of a circumference of the brake retaining portion, which is outside a predetermined circumferential portion close to the shifting shaft support portion and is defined by a pair of lines tangent to a circumference of the shifting shaft and parallel to a straight line connecting first and second axes and located on opposite sides of the straight line, as seen in a plane normal to the first axis, where a forward/reverse switching device including the reverse drive brake is disposed on the first axis, and a gear type transmission is disposed on the first axis and the second axis and an outer housing wall and a partition wall radially inwardly extending from the outer housing wall are provided.

A rotation/translation converter gear unit having a helical gear and a planetary gear for driving the helical gear. A spindle nut of the helical gear forms a planet carrier for planet wheels of the planetary gear. Situated between the planetary gear and the helical gear is an axial friction bearing, that at the same time forms a centering element which centers a sun wheel of the planetary gear between the planet wheels. In particular, the rotation/translation converter gear unit is used to drive a piston of a pressure generator for a brake control of a hydraulic vehicle brake system.

Flexured sun gears for planetary gear systems. In embodiments, a sun gear includes a spline section configured to couple the sun gear to another component, a gear section configured to mesh with at least one other gear of the planetary gear system, and a flexure section configured to couple the spline section to the gear section. The flexure section of the sun gear may have a flexure wall and a flexure curve, and has a thickness (e.g., in at least a portion of the flexure section) that is smaller than a thickness of the spline section and/or the gear section. The flexure section may enable the gear section to displace or move radially with respect to the spline section in response to a rotational force. For example, the flexure section may not move axially (e.g., may not extend) but may bend and/or rotate in response to the rotational force.

A transmission device to divide torque between gears. The device comprising a coaxial motion input member and transmission members and comprising shafts having gears at an axial end. Flanges which project radially outwards from the shafts, at the opposite axial end with respect to the gears, are axially facing and arranged abutting against each other, and are fixed to the motion input member to divide the torque transmitted by the motion input member between the flanges. The second shaft being axially hollow. The first shaft comprising a first intermediate portion having an outside diameter smaller than the inside diameter of the second shaft and housed at least with radial clearance in the second shaft. The flanges comprise respective portions configured to deform under the action of forces acting between the motion input member and the gears to enable a fluctuation of the shafts with respect to an axis.

A transmission device for splitting torque between two coaxial gears, in particular for a planetary gearing for aeronautic applications, has a motion input member and two transmission members, which are coaxial and have respective shafts provided with gears at an axial end and respective external flanges, at the opposite axial end; the two flanges are axially facing and placed abutting against each other, and are fixed to the motion input member so as to split the torque transmitted from the motion input member between the two flanges; one of the two shafts is axially hollow and houses, with radial clearance, an intermediate portion of the other shaft; the latter is formed by at least two pieces which are coaxial and fixed to each other.

Drive systems or powertrains including transmissions for electric and hybrid electric vehicles are provided. In some embodiments, dynamic, 2-position linear motor, one-way clutches are provided. In other embodiments, 3-position linear motor, 2-way clutches are provided. In a fixed speed ratio operating mode of an electric vehicle powertrain, torque values for two electric motors are determined by control logic to optimize overall efficiency of the motors. In a fixed torque ratio operating mode of the powertrain, speed values for the two motors are determined to optimize overall efficiency. A hybrid electric powertrain of at least one embodiment uses the optimized electric vehicle powertrain, an engine and the one-way and 2-way clutches to obtain a highly optimized hybrid powertrain.

In a vehicular power transmitting system, a fixing portion of a brake retaining portion receives a reaction force from a reverse drive brake and is located in a portion of a circumference of the brake retaining portion, which is outside a predetermined circumferential portion close to the shifting shaft support portion and is defined by a pair of lines tangent to a circumference of the shifting shaft and parallel to a straight line connecting first and second axes and located on opposite sides of the straight line, as seen in a plane normal to the first axis, where a forward/reverse switching device including the reverse drive brake is disposed on the first axis, and a gear type transmission is disposed on the first axis and the second axis and an outer housing wall and a partition wall radially inwardly extending from the outer housing wall are provided.

A planetary gear set, for a servomotor system, and including rotary components mounted in at least one assembly configuration, within a case, and producing a speed ratio of the planetary gear set, which is determined by this assembly configuration, between an input member and an output member. The rotary components allow changes in assembly configuration. Each assembly configuration produces a specific predetermined speed ratio. The invention is usable for servomotor systems.

Embodiments of a compliant shaft for engines are provided herein. In some embodiments, a compliant shaft for a turbine engine may include: a body having a first end configured to be coupled to a shaft of a turbine and a second end coupled to a gear of a gear box, wherein at least a portion of the body is flexible.

A geared turbofan engine with a sun shaft driving a sun gear of planetary gearbox. The sun shaft having a front section proximal to the gearbox and a rear section distal from the gearbox. The outer diameter of the front section of the sun shaft is smaller than the outer diameter of the rear section of the sun shaft. The front section of the sun shaft having between two and four undulant sections, wherein each undulant section having at least one axial part extending in axial direction of the sun shaft and two diaphragm parts on either side of the at least one axial part extending in radial direction outward, the at least one axial part of the undulant section having an inner diameter smaller than the outer diameter of the front section of the sun shaft.