Methods of manufacturing toothed components for gas turbine engines are provided. The methods include forming a first tooth in the component with a top land, a bottom land, a side wall extending therebetween, and a fillet radius transitioning between the side wall and the bottom land, forming a second tooth in the component adjacent the first tooth, the second tooth having a top land, a bottom land, a side wall extending therebetween and facing the first tooth, and a fillet radius transitioning between the side wall and the bottom land, the bottom land of the second tooth extending toward the bottom land of the first tooth, wherein the bottom lands define a gable area of the component, and forming a stress relief feature in the gable area such that the stress relief feature reduces a stress concentration near the gable area during operation of the toothed component.

According to the present invention, a low surface-roughness part (114a) is formed at a first tapered part (114), and, as a result, the roughness of an opening-edge of a groove part (113a) of an internal spline part (113) that opens at the first tapered part (114) is reduced, and surface pressure applied by the opening edge to a tooth (123b) of an external spline part (123) can be reduced. As a result, the opening edge of the groove part (113a) of the internal spline part (113) can be kept from digging into the tooth (123b), and variation, between products, in the insertion load of a second shaft part (12) can be suppressed.

An apparatus for power transmission of a vehicle, including a motor having a motor spline unit extending therefrom, and configured to generate power, a rotating body configured to receive the power and rotate, and a coupler having a toothed structure including grooves and having an exterior to be coupled to the motor spline unit and an interior to be coupled to the rotating body, wherein a width of the grooves formed at one end of the interior is larger than a width of the grooves formed at an opposite end of the interior, a width of the grooves formed at one end of the exterior is smaller than a width of the grooves formed at an opposite end of the exterior, and the coupler is coupled in a tension coupling with the rotating body and the motor.

A blower motor assembly includes a blower wheel and a motor. The blower wheel includes an integrally formed hub. The motor includes a shaft rotatable about an axis. The hub presents a radially inner hub surface that at least in part defines a hub opening. The inner hub surface defines an inner cross-sectional dimension. The shaft is axially received within the hub opening, such that the blower wheel is supported by the shaft for rotational movement. The shaft includes a toothed region defining a plurality of arcuately spaced apart teeth. Each of the teeth includes a cutting edge. The teeth present an outer cross-sectional dimension that is great than the inner cross-sectional dimension of the inner hub surface, such that the cutting edges of the teeth cut a plurality of grooves in the inner hub surface as the shaft is axially received in the hub opening.

A locking artificial tree trunk including a first generally cylindrical, hollow trunk portion including an upper end, the upper end defining a notch, and a second generally cylindrical trunk portion including a body portion, a lower end having an insertable portion, and an upper end. The locking artificial tree trunk also includes a coupling mechanism having a body portion and an upper portion having a tab, and defining a channel for receiving the insertable portion of the lower end of the second trunk portion. The body portion is inserted substantially into the upper end of the first trunk portion with the tab of the upper portion aligned with the notch, thereby preventing rotation of the coupling mechanism within the upper end of the first trunk portion.

A steering shaft for a motor vehicle has an inner shaft, arranged in an outer shaft that is displaceable axially in the direction of an axis of rotation. The inner shaft includes axially running radial projections on its outer side. The outer shaft includes axially running grooves on its inner side, into which grooves the projections of the inner shaft engage in a positively locking manner in a direction of rotation and displaceably in an axial direction. With regard to fault-free operation during fluctuating temperatures, on the inner shaft, there is arranged a profiled sleeve with undulating cross-sectional profile, the inner surface of which lies against the flanks of the projections of the inner shaft and the outer surfaces of which lie against the flanks of the grooves of the outer shaft, wherein the profiled sleeve is connected to the inner shaft at one or more fastening points.

A self-aligning and torque transmitting coupler assembly includes an outer coupler coupled to a first shaft of and an inner coupler coupled to a second shaft. The outer coupler comprises an inner surface having primary and secondary alignment and torque transmitting features, and the inner coupler comprises an outer surface having primary and secondary alignment features. The primary and secondary alignment features are configured to interlock and facilitate alignment of the first and second shafts along a common axis in an exemplary application of a foundation support system.

A modular foundation support system includes modular foundation support components including self-aligning and torque transmitting coupler features wherein a plurality of axially elongated ribs are aligned with a plurality of axially elongated ribs on a second distal end to rotationally interlocked the modular foundation support components to one another. First and second pair of fastener holes are self-aligning with one another to receive a fastener therethrough such that the fastener is mechanically isolated from rotational torque transmission.

A spline connection structure includes a shaft portion having teeth with crowned tooth surfaces formed at equal intervals on an outer circumferential surface and a cylindrical portion having grooves into which the teeth of the shaft portion are fitted formed on an inner circumferential surface are connected. Two adjacent tooth surfaces facing each other are bent while maintaining a constant distance therebetween in a tooth width direction when viewed from a diameter direction of the shaft portion.

A method may be used to produce a variable-length steering shaft. The method may involve positioning a shaft core within a mold cavity of an injection molding tool coaxially with respect to a mold surface that delimits a toothing region, injecting molten plastic into the mold cavity between the shaft core and the mold surface of the mold cavity with an injection nozzle, removing a toothed shaft from the injection molding tool after the plastic has solidified, providing a hollow shaft and axially inserting the toothing region into an internal toothing, and for the positioning of the shaft core arranging positioning elements at least partially in a region of the mold surface of the toothing. The positioning elements, by way of positioning surfaces, may lie against the shaft core radially from an outside in a region of the toothing and hold the shaft core coaxially in the mold cavity.