A power unit is configured for use as part of a concrete screed and includes a frame and a powered drive. The frame includes a drive housing. The powered drive is operably supported by the drive housing and is configured to rotate a rotatable concrete forming drum. The powered drive includes an electric motor and a battery operably coupled to the electric motor and configured to power the electric motor. The powered drive includes a drive shaft drivingly connectable relative to the drum, with rotation of the drive shaft causing corresponding rotation of the drum.

A steering shaft assembly includes a first member having a first member inner surface and a first member outer surface. Each surface extending between a first member first end and a first member second end along an axis. A second member having a second member inner surface and a second member outer surface. Each surface extending between a second member first end and a second member second end along the axis. The first member first end arranged to be received within the second member such that the second member inner surface is disposed about a portion of the first member outer surface. Also included is a shaft extending from a third member. The shaft extending into the first member second end along the axis.

Disclosed is a washing machine. The washing machine comprises an impeller, a decelerating clutch and an impeller connection assembly, wherein the decelerating clutch has a rotary shaft; and the impeller connection assembly is clamped and clamped and fixedly connected to the rotary shaft, so that the impeller is clamped and fixedly connected to the rotary shaft in a detachable way, thereby reducing the difficulties of the assembly and disassembly of the impeller, and prolonging the service life of the washing machine.

An oscillation decoupling system does not transmit oscillations, for example, from a drive train of a vehicle to an actuator system for a clutch. The oscillation decoupling system has an adjusting element. The actuator system includes an active element which is designed to carry out an active movement in a predetermined working direction and an element of the oscillation decoupling system which connects the active element to the actuator device and to the adjusting element. The element of the oscillation decoupling system includes, in a predetermined direction of work, a play region in which the active element or the adjusting element moves without the respective other moving element.

A modular motor assembly structure is disclosed and configured to couple with a drive shaft of an application device. The drive shaft includes a receiving slot. The modular motor assembly includes a main body and a combination key. The main body includes a shaft hole and a key groove. The shaft hole includes an opening and a central axis. The key groove is disposed on a side wall around the shaft hole and parallel to a central axis of the shaft hole. The combination key has a front end and a rear end. When one end of the drive shaft is inserted into the shaft hole along the central axis of the shaft hole, the combination key is at least partially accommodated in the receiving slot, and the front end faces the key groove. The combination key has a continuously increasing thickness from the front end to the rear end.

A dual function gearbox generates two separate output rotational motions from a single input rotational motion. First and second rotatable housings comprise corresponding first and second internal gears, with the internal gears having different pitch diameters. A drive shaft is disposed within the housings, extending though openings within opposite sides of housings, with an eccentric rotor disposed around the drive shaft. The eccentric rotor is in operative contact with a differential gear ring comprising first and second external gear rings having different diameters, with the first and second external gear rings engaging corresponding first and second internal gears. When rotational energy is imparted to one end of the drive shaft, the gearing arrangement imparts a rotational motion to either the first or second rotatable housing, with the housing rotating around the other end of the rotating drive shaft, which can extend outside of the dual function gearbox. Thus, the dual function gearbox generates two output motions: high torque rotation of the rotatable housing; and rotation of the drive shaft which can be used as an input rotation to additional dual function gearboxes.

In order to simplify the design of an aircraft turbo engine propeller while enhancing the safety function thereof related to control of the blade angle of attack, a propeller is provided comprising a secondary rotational coupling to couple in rotation, along the radial axis of the blade, the inner radial end of the blade root with a mechanical joining member of a blade angle of attack control device, the secondary coupling being designed and configured to be active in the event of failure of the main pin.

A drive shaft is for selectively connecting a drive input to an output. The drive shaft has a tubular portion, a first diaphragm member, and a second diaphragm member displaced axially along the shaft from the first diaphragm member. The first and second diaphragm members each are formed with two axial ends. At least one undulation extends radially of the ends. The tubular portion connects the first and second diaphragm members. The first and second diaphragm members and the tubular portion are formed of fiber-reinforced polymer matrix composites. The first and second diaphragm members are connected to first and second axial ends of the tubular portion through a mechanical connection at joints. A method of forming a drive shaft is also disclosed.

A compressor-impeller fixing nut has a tubular shape, and includes: a curved-surface shaped portion disposed in a first range from a first end side in an axial direction, the curved-surface shaped portion having an outer diameter which increases toward a second end side in the axial direction and including an outer peripheral surface having a curved shape which protrudes outward in a radial direction in a cross section along the axial direction; and a nut portion disposed in a second range closer to the second end side from the first range in the axial direction, the nut portion having an outer peripheral surface with a nut shape. An expression (D1maxD1min)/2<L is satisfied, where L is a length of the first range in the axial direction, and D1max is a maximum value and D1min is a minimum value of the outer diameter of the curved-surface shaped portion in the first range.

A power unit is configured for use as part of a concrete screed and includes a frame and a powered drive. The frame includes a drive housing. The powered drive is operably supported by the drive housing and is configured to rotate a rotatable concrete forming drum. The powered drive includes an electric motor and a battery operably coupled to the electric motor and configured to power the electric motor. The powered drive includes a drive shaft drivingly connectable relative to the drum, with rotation of the drive shaft causing corresponding rotation of the drum.