A carrier assembly for a planetary gear assembly includes a planet frame defining a central aperture therethrough, the central aperture defining a rotation axis, the planet frame configured to rotatably support a plurality of planet gears, and a carrier connected to the planet frame via a stud. At least one of a portion of the carrier proximate the stud and a portion of the stud between the carrier and the planet frame has a dimension reduction, such as a thickness reduction, therein.

A carrier assembly for a planetary gear assembly includes a planet frame defining a central aperture therethrough, the central aperture defining a rotation axis, the planet frame configured to rotatably support a plurality of planet gears, and a carrier connected to the planet frame via a stud. At least one of a portion of the carrier proximate the stud and a portion of the stud between the carrier and the planet frame has a dimension reduction, such as a thickness reduction, therein.

A driving apparatus according to an embodiment includes an arm, an operation target, and a brake unit. The arm has one end supported by a support mechanism, and includes an electric driving source. The operation target is attached to the other end of the arm, the other end being an end on the opposite side of the one end, and is enabled to be pivoted by the driving source about one rotational axis intersecting with a direction from the one end to the other end. The brake unit secures immobility of a target gear that is a gear disposed in the arm, and that is a gear being rotated as the operation target is pivoted, when the power supply to the driving source stops.

A driving apparatus according to an embodiment includes an arm, an operation target, and a brake unit. The arm has one end supported by a support mechanism, and includes an electric driving source. The operation target is attached to the other end of the arm, the other end being an end on the opposite side of the one end, and is enabled to be pivoted by the driving source about one rotational axis intersecting with a direction from the one end to the other end. The brake unit secures immobility of a target gear that is a gear disposed in the arm, and that is a gear being rotated as the operation target is pivoted, when the power supply to the driving source stops.

A drive transmission mechanism includes a drive input gear part, an output side coupling and a coil spring. The drive input gear part includes a cylindrical boss formed on a rotational center. The drive input gear part is coupled to a drive input side gear. The output side coupling is rotated together with the drive input gear part around a same rotational axis as the drive input gear part to output a drive force of the drive input gear part to a driven member. The coil spring biases the output side coupling to a direction separated away from the drive input gear part along the rotational axis. The drive input gear part and the output side coupling are rotatable around a slide pin inserted into a slide hole formed in the boss as the rotational axis. The coil spring is held between the output side coupling and the slide pin.

A drive transmission mechanism includes a drive input gear part, an output side coupling and a coil spring. The drive input gear part includes a cylindrical boss formed on a rotational center. The drive input gear part is coupled to a drive input side gear. The output side coupling is rotated together with the drive input gear part around a same rotational axis as the drive input gear part to output a drive force of the drive input gear part to a driven member. The coil spring biases the output side coupling to a direction separated away from the drive input gear part along the rotational axis. The drive input gear part and the output side coupling are rotatable around a slide pin inserted into a slide hole formed in the boss as the rotational axis. The coil spring is held between the output side coupling and the slide pin.

A gear transmission system embodying a unique twin pitch belt is provided. The twin pitch belt provides external first pitch gear teeth and a second pitch gear teeth synchronously engaging a fixed housing gear teeth and output gear teeth, respectively. The first and second pitch gear teeth may have the same gear pitch if different number of teeth though offset by a distance relative to each other. The first and second pitch gear teeth have less teeth than the housing and output gear teeth, in turn twice countering the rotation of an input shaft operatively associated with the twin pitch belt, resulting in the output gear teeth rotating in the same direction as the input shaft.

A gear transmission system embodying a unique twin pitch belt is provided. The twin pitch belt provides external first pitch gear teeth and a second pitch gear teeth synchronously engaging a fixed housing gear teeth and output gear teeth, respectively. The first and second pitch gear teeth may have the same gear pitch if different number of teeth though offset by a distance relative to each other. The first and second pitch gear teeth have less teeth than the housing and output gear teeth, in turn twice countering the rotation of an input shaft operatively associated with the twin pitch belt, resulting in the output gear teeth rotating in the same direction as the input shaft.

An engine includes a static frame member; a spool configured to rotate relative to the static frame member during operation of the engine; a gearbox coupled to the spool; and a gearbox coupling assembly mounting the gearbox to the static frame member using a plurality of moveable connection members, each moveable connection member including a sliding connection allowing for movement of the gearbox relative to the static frame member in a plane perpendicular to an axial direction of the engine.

An engine includes a static frame member; a spool configured to rotate relative to the static frame member during operation of the engine; a gearbox coupled to the spool; and a gearbox coupling assembly mounting the gearbox to the static frame member using a plurality of moveable connection members, each moveable connection member including a sliding connection allowing for movement of the gearbox relative to the static frame member in a plane perpendicular to an axial direction of the engine.