A coupling device for rotably coupling a shaft with a gearbox in a geared turbo fan aircraft engine, wherein the coupling device includes a connection to the shaft at a first end and a connection to the gearbox at a second end, the first and the second ends being axially separated and at least one curved shape between the first end and the second end extending from the gearbox radially inwards to the shaft and the at least one curved shape including at least one cross-section in the axial direction of the engine with a logarithmic profile or a power profile.

A torque transfer system includes a drive shaft threaded into a housing. The drive shaft includes shaft splines. The housing includes housing splines. A sleeve includes inner splines and outer splines. The inner splines are configured to interlock with the shaft splines and the outer splines are configured to interlock with the housing splines.

A rotor comprising a shaft having splines with flanks thereon; a lamination disposed on the shaft and configured to engage at least one flank less than all flanks of all of the splines. A method for making a rotor comprising configuring a lamination with an opening for a shaft having splines thereon, the lamination having a recess that provides a clearance fit over a flank of a spline; press fitting the shaft into the lamination while maintaining clearance over the flank.

A rotor comprising a shaft having splines with flanks thereon; a lamination disposed on the shaft and configured to engage at least one flank less than all flanks of all of the splines. A method for making a rotor comprising configuring a lamination with an opening for a shaft having splines thereon, the lamination having a recess that provides a clearance fit over a flank of a spline; press fitting the shaft into the lamination while maintaining clearance over the flank.

A method for producing a shaft-hub connection in which a shaft component and a hub component are placed into a joined state in the form of a frictional shaft-hub connection. The shaft component has a toothed region having teeth with a height H, and the hub component has a mating toothed region having a mating region internal diameter d. The hub component is pushed onto the shaft component in a longitudinal direction to produce the frictional shaft-hub connection and in the process geometrically reproduces the toothed region in the mating toothed region. The mating toothed region passes over a cylindrical centering region with an outer diameter D before coming into contact with the toothed region. The outer diameter D is at most 0.2 mm and at least 0.005 mm smaller than the mating region inner diameter d. The centering region has a length L greater than 1 mm.

A method for producing a shaft-hub connection in which a shaft component and a hub component are placed into a joined state in the form of a frictional shaft-hub connection. The shaft component has a toothed region having teeth with a height H, and the hub component has a mating toothed region having a mating region internal diameter d. The hub component is pushed onto the shaft component in a longitudinal direction to produce the frictional shaft-hub connection and in the process geometrically reproduces the toothed region in the mating toothed region. The mating toothed region passes over a cylindrical centering region with an outer diameter D before coming into contact with the toothed region. The outer diameter D is at most 0.2 mm and at least 0.005 mm smaller than the mating region inner diameter d. The centering region has a length L greater than 1 mm.

A wheel bearing device (1) including: an outer member (2) on the inner periphery of which an outer-side rolling surface (2c/2d) is formed; an inner member (3) on the outer periphery of which an inner-side rolling surface (3c/3d) is formed; and a plurality of rolling bodies (41) interposed between the rolling surfaces (2c/2d/3c/3d) of the outer member (2) and the inner member (3). The wheel bearing device having a spline hole (3b) formed in a through hole (3h) of the inner member (3). The spline hole includes a guide groove (3G) formed on an inner circumferential surface thereof. A guide plate (8G) of a finishing broach (8) passes through the guide groove in the inner periphery of the spline hole (3b).

An adapter is provided which allows an external driving tool to drive a driven tool such as an intraosseous needle assembly, where the external driving tool would otherwise be incompatible with the needle assembly. The adapter includes a driver connector having a bore, where the bore is to receive an external driver of the external driving tool. The adapter further includes a driver attached to the driver connector. A cross-sectional shape of the bore is different than a cross-sectional shape of the attached driver. The attached driver includes resilient legs which assist in securing the adapter to the needle assembly. The resilient legs may include protuberances to secure the adapter.

An adapter is provided which allows an external driving tool to drive a driven tool such as an intraosseous needle assembly, where the external driving tool would otherwise be incompatible with the needle assembly. The adapter includes a driver connector having a bore, where the bore is to receive an external driver of the external driving tool. The adapter further includes a driver attached to the driver connector. A cross-sectional shape of the bore is different than a cross-sectional shape of the attached driver. The attached driver includes resilient legs which assist in securing the adapter to the needle assembly. The resilient legs may include protuberances to secure the adapter.

A linear electromechanical actuator includes a housing, an electric motor, an output member, and a roller screw drive arranged within the housing. The roller screw drive includes a rod and a screw connected to each other to form the output member. The rod has an axial opening at the end proximal to the screw, and the screw has a connecting section at the end proximal to the rod with a plurality of longitudinal teeth arranged along the perimeter of the connecting section and embedded into the surface of the axial opening. The actuator further includes a retainer engaged with the rod and the screw for preventing a relative longitudinal movement thereof. Methods are also provided for assembling the output element of the actuator.