A gas turbine engine including a fan, a core including at least one rotatable shaft, and a gearbox mechanically coupling at least one rotatable shaft of the core to the fan is provided. The gas turbine engine also includes a coupling system for mounting the gearbox within the gas turbine engine. The coupling system includes a flexible coupling connected to at least one of a fan frame or a core frame, as well as a torque frame connected to the flexible coupling and the gearbox. Moreover, a deflection limiter is provided, loosely attaching the flexible coupling to the gearbox to provide a predetermined axial range of motion, radial range of motion, and circumferential range of motion between the gearbox and the frame to which the flexible coupling is attached.

A gas turbine engine including a fan, a core including at least one rotatable shaft, and a gearbox mechanically coupling at least one rotatable shaft of the core to the fan is provided. The gas turbine engine also includes a coupling system for mounting the gearbox within the gas turbine engine. The coupling system includes a flexible coupling connected to at least one of a fan frame or a core frame, as well as a torque frame connected to the flexible coupling and the gearbox. Moreover, a deflection limiter is provided, loosely attaching the flexible coupling to the gearbox to provide a predetermined axial range of motion, radial range of motion, and circumferential range of motion between the gearbox and the frame to which the flexible coupling is attached.

A gearbox with motor fixing structure is used to fix a motor on the gearbox. The motor has a body and a shaft protruding from the leading edge of the body. The gearbox with motor fixing structure comprises a box and a metal part. The box has a gear set configured inside. An outer edge of a side wall of the box has a first hole. The metal part is configured inside the box. The motor is embedded in the first hole. The leading edge of the body of the motor is locked on the metal part, and the shaft of the motor passes through the metal part into the box to connect with the gear set.

A gas turbine engine includes a fan shaft that drives a fan that has fan blades. The fan delivers airflow to a bypass duct. A gear system is connected to the fan shaft and is driven through an input defining an input lateral stiffness and an input transverse stiffness. A gear system flex mount arrangement accommodates misalignment of the fan shaft and the input during operation. A frame for supporting the fan shaft defines a frame lateral stiffness and a frame transverse stiffness. The input lateral stiffness is less than 11% of the frame lateral stiffness and the input transverse stiffness is less that 11% of the frame transverse stiffness.

A gas turbine engine includes a fan shaft that drives a fan that has fan blades. The fan delivers airflow to a bypass duct. A gear system is connected to the fan shaft and is driven through an input defining an input lateral stiffness and an input transverse stiffness. A gear system flex mount arrangement accommodates misalignment of the fan shaft and the input during operation. A frame for supporting the fan shaft defines a frame lateral stiffness and a frame transverse stiffness. The input lateral stiffness is less than 11% of the frame lateral stiffness and the input transverse stiffness is less that 11% of the frame transverse stiffness.

A reducer of an electric power-assisted steering apparatus includes: a second shaft that is gear-coupled to a worm wheel by a worm disposed on an outer circumference of the second shaft and is connected to a first shaft driven by a motor through a power transfer member; a bearing coupled to an inside of a gear housing so as to support rotation of the second shaft; and a ring-shaped fixing member that is coupled to the second shaft and supported by one side of the bearing, and provides support between the second shaft and the bearing, thereby preventing the second shaft from escaping from the power transfer member.

A reducer of an electric power-assisted steering apparatus includes: a second shaft that is gear-coupled to a worm wheel by a worm disposed on an outer circumference of the second shaft and is connected to a first shaft driven by a motor through a power transfer member; a bearing coupled to an inside of a gear housing so as to support rotation of the second shaft; and a ring-shaped fixing member that is coupled to the second shaft and supported by one side of the bearing, and provides support between the second shaft and the bearing, thereby preventing the second shaft from escaping from the power transfer member.

Disclosed herein is a vehicle steering apparatus that includes a main rack housing configured to surround a rack bar, a reduction-unit-side rack housing extending to one side of the main rack housing and connected to a reduction unit for reducing motor power, and an input-unit-side rack housing extending to the other side of the main rack housing and connected to a steering input unit having a pinion gear installed thereto, wherein the reduction-unit-side rack housing is formed with a first resonance reduction rib for reducing resonance.

An automatic transmission includes a brake including a fixed-side cylindrical member spline-coupled to a transmission case, a rotation-side cylindrical member coupled to a given rotating member, a plurality of friction plates disposed between the fixed-side cylindrical member and the rotation-side cylindrical member, and including a fixed-side friction plate configured to be spline-engaged with the fixed-side cylindrical member and a rotation-side friction plate configured to be spline-engaged with the rotation-side cylindrical member, and a piston configured to engage the plurality of friction plates. The automatic transmission further includes a shock absorbing member disposed between a spline part of the transmission case and a spline part of the fixed-side cylindrical member and configured to absorb impact when the fixed-side cylindrical member rotates relative to the transmission case.

An automatic transmission includes a brake including a fixed-side cylindrical member spline-coupled to a transmission case, a rotation-side cylindrical member coupled to a given rotating member, a plurality of friction plates disposed between the fixed-side cylindrical member and the rotation-side cylindrical member, and including a fixed-side friction plate configured to be spline-engaged with the fixed-side cylindrical member and a rotation-side friction plate configured to be spline-engaged with the rotation-side cylindrical member, and a piston configured to engage the plurality of friction plates. The automatic transmission further includes a shock absorbing member disposed between a spline part of the transmission case and a spline part of the fixed-side cylindrical member and configured to absorb impact when the fixed-side cylindrical member rotates relative to the transmission case.