A vehicle drive device that includes a rotary electric machine that serves as a driving force source for wheels; a first rotation member coupled to a rotor of the rotary electric machine; and a fluid coupling that is disposed on an axial first side, which is one side in an axial direction with respect to the rotary electric machine, and that has a rotation housing.

A damper apparatus includes a drive plate, a driven plate, torsion springs, and spring housing portions. The torsion springs each have a large arc spring and a small arc spring, and elastically couple the drive plate and the driven plate in the rotation direction and transmit torque. The spring housing portions have a support surface that can support the outer periphery of the large arc springs, and the support surface comes into contact with the outer periphery of the central portions, in the lengthwise direction, of the large arc springs. Also, gaps exist between the support surface and the outer periphery of the two end portions, in the lengthwise direction, of the large arc springs.

A coupling arrangement is provided with a vibration reduction device and with a clutch device. The vibration reduction device has at least one torsional vibration damper, an input connected to a drive, and an output connected to the clutch device by which a connection between the vibration reduction device and a driven end is at least substantially produced in a first operating state, and this connection is at least substantially cancelled in a second operating state. The vibration reduction device has a mass damper system that cooperates with the torsional vibration damper and is connected to the output of the vibration reduction device.

A torsional vibration damper that damps torsional vibration effectively in a low-speed range. In the torsional vibration damper, a spring holder is formed by apertures of an input element and an output element, and an elastic member is held in the spring holder. A first moveable range of a planetary element extending from an initial position in a drive direction is wider than a second movable range of the planetary element extending from the initial position in a counter direction.

A hydrokinetic torque converter includes an impeller, an axially displaceable turbine piston, and impeller and turbine-piston lockup clutch core plates. The impeller lockup clutch core plate is situated between the impeller shell and the turbine-piston shell, is connected to an impeller core ring, and has a first surface. The turbine-piston lockup clutch core plate is situated between the impeller shell and the turbine-piston shell, is connected to a turbine-piston core ring, and is axially displaceable with the turbine-piston to move a second surface of the turbine-piston lockup clutch core plate axially towards and away from the first surface for positioning the torque converter respectively into and out of a lockup mode in which the turbine-piston is mechanically interlocked to the impeller.

A lock-up device for a torque converter is configured to transmit a torque from a front cover to a transmission-side member through a turbine. The lock-up device includes a clutch portion, a piston and an elastic member. The clutch portion is disposed between the front cover and the turbine, and includes a clutch plate. The piston is movable in an axial direction. The piston includes a pressing surface for pressing the clutch plate. The piston turns the clutch portion into a torque transmission state. The elastic member is disposed on a same side as the pressing surface of the piston. The elastic member is begins to elastically deform before the pressing surface contacts the clutch plate in conjunction with movement of the piston toward the clutch portion.

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 torque converter includes a torque converter body and a lock-up device. The torque converter body includes an impeller, a turbine having a turbine shell, and a stator. The lock-up device directly transmits a torque from a front cover to the turbine, and includes a damper portion and a clutch portion to which the torque from the front cover is inputted. The damper portion includes an output-side member, a plurality of elastic members and a holder plate. The output-side member is coupled to the turbine shell. The plurality of elastic members elastically couple the clutch portion and the output-side member in a rotational direction. The holder plate is rotatable relatively to the output-side member, and holds the plurality of elastic members. The holder plate is supported at an inner peripheral end thereof by an outer peripheral surface of the turbine shell and positions the damper portion in a radial direction.

A lock-up device for a torque converter transmits a torque from a front cover to a transmission-side member through a turbine. The lock-up device includes a clutch portion, a piston, a support member, and a synchronization mechanism. The clutch portion is disposed between the front cover and the turbine. The piston is movable in an axial direction. The piston turns the clutch portion into a torque transmission state. The support member supports the piston such that the piston is movable. The support member defines an oil chamber together with the piston. The oil chamber is supplied a hydraulic oil for activating the piston. The synchronization mechanism causes the piston to rotate in synchronization with the support member.

A lock-up device includes a clutch portion, a piston, a sleeve and an oil chamber plate. The clutch portion is disposed between the front cover and a turbine. The piston is movable in an axial direction. The piston turns the clutch portion into a torque transmission state. The sleeve is fixed to a front cover and includes an outer peripheral surface and a protrusion. The outer peripheral surface supports an inner peripheral surface of the piston such that the piston is movable in the axial direction. The protrusion has an annular shape and protrudes radially outward from the outer peripheral surface. The oil chamber plate has a disc shape and is joined to a piston-side lateral surface of the protrusion of the sleeve. The oil chamber plate defines an oil chamber together with the piston therebetween. The oil chamber is supplied a hydraulic oil for activating the piston.