There is disclosed an aircraft engine having: an engine shaft; a first transmission shaft in driving engagement with the engine shaft and a second transmission shaft concentric with the first transmission shaft and in driving engagement with the first transmission shaft, the second transmission shaft drivingly engageable to an engine accessory, the first and second transmission shafts rotatable about an axis; and at least two axially spaced apart annular ring seals disposed radially between the first and second transmission shafts, the at least two annular ring seals biased against both of the first and second transmission shafts.

A torque tube assembly includes a torque tube and a spline coupling coupled to an end of the torque tube. The spline coupling has an opening to receive a spline gear on a drive shaft of an aircraft high lift device. The torque tube assembly also includes a retainer coupled to the spline coupling. The retainer blocks at least a portion of the opening in the spline coupling to prevent the spline coupling from being moved off of the spline gear on the drive shaft.

Example torque tube assemblies may be used with aircraft high lift devices. An example torque tube assembly includes a torque tube having a first end and a second end opposite the first end. A first fitting is coupled to the first end and a second fitting is coupled to the second end. The first fitting is to be coupled to a first high lift device of an aircraft. The second fitting has a spline section. The torque tube assembly also includes a sliding spline shaft having a channel and a first yoke. The second fitting is slidably received within the channel. The torque tube assembly further includes a spline coupling having a second yoke, which is coupled to the first yoke of the sliding spline shaft to form a U-joint. The spline coupling is to be coupled to a second high lift device of the aircraft.

There is disclosed an aircraft engine having: an engine shaft; a first transmission shaft in driving engagement with the engine shaft and a second transmission shaft concentric with the first transmission shaft and in driving engagement with the first transmission shaft, the second transmission shaft drivingly engageable to an engine accessory, the first and second transmission shafts rotatable about an axis; and at least two axially spaced apart annular ring seals disposed radially between the first and second transmission shafts, the at least two annular ring seals biased against both of the first and second transmission shafts.

A shield assembly for a shaft includes a first tubular section having a first end and a second end and a second tubular section having a first end and a second end. The first and second tubular sections are each hollow receiving the shaft. The first tubular section includes a first outer diameter and the second tubular section includes a second outer diameter, the first outer diameter being greater than the second outer diameter. The first tubular section and the second tubular section are telescopically coupled to one another where the second tubular section is movably disposed at least partially within the first tubular section.

A steering shaft according to an aspect of the present invention includes an upper shaft, a lower shaft, and a seal cap. The seal cap includes a seal which comes into close contact with an inner peripheral surface of the upper shaft and a closure which bulges upward with respect to the seal. The closure is plastically deformed downward, and thus, the seal cap is held in an upper end opening portion in a state where the seal is pressed against the inner peripheral surface of the upper shaft.

In a power transmission shaft including a rear-side shaft having a male spline joint portion formed on the outer periphery of a front end of the rear-side shaft and a tubular front-side shaft having a female spline joint portion formed on the inner periphery of a rear end of the tubular front-side shaft, a seal ring is housed in a seal housing groove configured at the rear end of the tubular front-side shaft. The seal ring is interposed between an outer peripheral seal surface of the rear-side shaft and an inner peripheral surface of the seal housing groove with a compressive deformation. Additionally, the seal ring is sandwiched and retained between the inside wall surface of the seal housing groove and the inside end face of a disk-shaped retainer part of a retainer press-fitted to the rear end of the tubular front-side shaft.

A propeller shaft assembly including a first shaft that presents a plurality of external splines, and a second shaft that has an internal wall which defines an axial bore. The axial bore receives the first shaft and presents a plurality of internal splines that are interleaved with the external splines of the first shaft for providing relative axial movement between the first and second shafts while rotationally fixing the first and second shafts to one another. At least one thrust ring is positioned against the internal wall of the second shaft and surrounds the external splines of the first shaft. The at least one thrust ring has at least one contact portion that is radially deformed in a bending manner against the external splines for causing a radial preload against the external splines. The at least thrust ring extends between a pair of ends that are disposed in spaced relationship with one another to define a gap between the ends.

A constant velocity universal joint includes a body which encloses the constant velocity joint components and provides a smooth outer surface. A semi-rigid plastic boot has a spherical surface sized to generally match the outer surface of the body. The material of the boot is sufficiently elastic to allow the boot to fit over the body, yet sufficiently resilient to snap the open end closed after the boot is placed over the body to provide a substantial seal preventing entry of debris under the seal. A retaining ring is positioned on the boot near the truncated end, the ring establishing the location of an elastic seal that contacts the outer surface of the body.

A coupling guard for covering a coupling device for connecting a first machine to a second machine, wherein the coupling guard has a first guard unit and a second guard unit, the second guard unit has a first flange as well as a second flange and the first flange of the second guard unit is connected with a flange of the first guard unit. A coupling guard with an enhanced design is achieved in that the flange of the first guard unit and the first flange of the second guard unit are in contact with each other at their respective rear side.