An engine assembly may include an internal combustion engine, an expander coupled to the engine, a pulley rotatably arranged on a shaft of the expander and coupled to the engine, a coupling device including at least one elastic operating element arranged within an operating element accommodation in an axially deformable manner, a drive disk arranged on the shaft between the pulley and the at least one operating element, and a pressure device connected to the operating element accommodation via a fluid line and configured to apply pressure to the operating element accommodation. The at least one operating element may be deformable in an axial direction such that the at least one operating element adjusts the drive disk into force-transferring contact with the pulley when the at least one operating element is deformed by a pressure applied to the operating element accommodation by the pressure device.

An engine assembly may include an internal combustion engine, an expander coupled to the engine, a pulley rotatably arranged on a shaft of the expander and coupled to the engine, a coupling device including at least one elastic operating element arranged within an operating element accommodation in an axially deformable manner, a drive disk arranged on the shaft between the pulley and the at least one operating element, and a pressure device connected to the operating element accommodation via a fluid line and configured to apply pressure to the operating element accommodation. The at least one operating element may be deformable in an axial direction such that the at least one operating element adjusts the drive disk into force-transferring contact with the pulley when the at least one operating element is deformed by a pressure applied to the operating element accommodation by the pressure device.

In an aspect, the invention is directed to a clutched device that includes a clutch input member, a clutch output member, and a wrap spring clutch. The wrap spring clutch is engageable with the clutch input member and the clutch output member and has a radially outer surface and a radially inner surface. One of the radially outer and inner surfaces is engageable with a clutch engagement surface on one of the clutch input member and the clutch output member. The clutch engagement surface has a surface finish that includes peaks and valleys, wherein the peaks engage the wrap spring clutch and each have a selected width.

In an aspect, the invention is directed to a clutched device that includes a clutch input member, a clutch output member, and a wrap spring clutch. The wrap spring clutch is engageable with the clutch input member and the clutch output member and has a radially outer surface and a radially inner surface. One of the radially outer and inner surfaces is engageable with a clutch engagement surface on one of the clutch input member and the clutch output member. The clutch engagement surface has a surface finish that includes peaks and valleys, wherein the peaks engage the wrap spring clutch and each have a selected width.

A decoupler having an input hub, an output member, a one-way clutch, and at least one isolation spring. Rotary power is transmitted in a predetermined rotational direction from the input hub, through the one-way clutch, through the isolation spring and to the output member. A method for forming a decoupler is also provided.

A decoupler having an input hub, an output member, a one-way clutch, and at least one isolation spring. Rotary power is transmitted in a predetermined rotational direction from the input hub, through the one-way clutch, through the isolation spring and to the output member. A method for forming a decoupler is also provided.

A clutch portion is disposed between a front cover and a turbine. A piston is movable in an axial direction and turns the clutch portion into a torque transmission state. A sleeve supports an inner peripheral surface of the piston such that the piston is movable in the axial direction. An oil chamber is supplied a hydraulic oil for activating the piston to turn the clutch portion into the torque transmission state. The sleeve includes an inner peripheral side oil channel and an outer peripheral side oil channel. The inner peripheral side oil channel leads the hydraulic oil residing on an inner peripheral side of the sleeve to an outer peripheral side. The outer peripheral side oil channel leads the hydraulic oil led thereto through the inner peripheral side oil channel to the oil chamber.

A two-speed pulley assembly for an engine accessory drive includes a planetary gear, a pulley, a friction clutch, a one-way clutch, and a torsional isolator. The planetary gear has a ring gear, a sun gear, a planet carrier and at least one planet gear. The planet carrier is arranged for driving engagement with an engine crankshaft. The pulley circumscribes the ring gear and is in driving engagement with the ring gear. The friction clutch is arranged to selectively prevent rotation of the sun gear. The one-way clutch permits rotation of the sun gear relative to the ring gear in a first rotational direction, and prevents rotation of the sun gear relative to the ring gear in a second rotational direction, opposite the first rotational direction. The torsional isolator is drivingly connected to the planet carrier and arranged to rotate at a same speed as the planet carrier.

In an aspect, a decoupler is provided and includes an input member, an output member, a one-way clutch and an isolation spring. The one-way clutch receives torque from the input member. The isolation spring is helical, having a first helical end and a second helical end, and has first and second axial ends, and radially outer and inner surfaces. The isolation spring receives torque from the clutch, and transmits torque to the output member. The isolation spring changes size radially based on torque. The input member includes a radial projection that is positioned to frictionally engage one of the radially outer and inner surfaces of the spring when the spring reaches a selected size. Frictional engagement of the radial projection with the spring generates torque transfer directly from the input member to the spring in parallel with torque transfer from the input member to the spring through the clutch.

A Pump for recirculating a cooling fluid of a vehicle comprises a pump body, which is fixed during use; an impeller mounted on a driven shaft; with a friction coupling of the electromagnetic type, made of a fixed electromagnet, a rotor and an armature. A pulley for taking up a rotational movement is connected to a movement source such as a shaft of the combustion engine of the vehicle and mounted on an outer bearing keyed onto the pump body. An electric motor is provided for driving the driven shaft independently of the movement take-up pulley; and a bell member is fastened to an end of the driven shaft opposite to that which carries the impeller. The friction coupling is designed to rotationally couple/decouple the pulley and bell member and the electric motor is arranged inside the bell member on the opposite side to the impeller relative to friction coupling.