An intermediate wall is provided with a return oil hole through which oil discharged from a friction engagement device returns toward an oil reservoir. A chain drive is disposed adjacent to the intermediate wall. The chain drive transmits a driving force from an input member and/or a rotary electric machine to an oil pump. There is provided an oil guide through which oil flowing through the return oil hole is guided to a region other than a chain placement region inside a case. The chain placement region is a region where a chain of the chain drive is placed.

Provided is an oil path structure for powertrain for a hybrid vehicle, the oil path structure including: a P1 motor mounted in a housing and including a first stator and a first rotor; a P2 motor mounted in the housing so as to be spaced apart from the P1 motor at an interval and including a second stator and a second rotor; an input shaft having therein an oil passageway and having an outer circumference on which the P2 motor is mounted; and a first oil hole penetratively formed from the oil passageway of the input shaft toward a first bearing connected to a second rotor shaft of the second rotor.

A transfer structure for a vehicle which retains a stable amount of lubricant in a coupling chamber and maintains a cooling effect for a coupling by agitation of the lubricant irrespective of an inclination of a vehicle in a front-rear direction. The transfer structure includes a gear chamber housing first and second gears meshing with each other; a coupling chamber housing a coupling provided coaxially with the first gear; an introduction path which introduces a lubricant in the gear chamber into the coupling chamber; and a return path through which the lubricant in the coupling chamber is returned to the gear chamber. The return path is inclined downward toward the gear chamber from an opening that opens in a lower part of an intermediate part of the coupling chamber in a vehicle front-rear direction to an oil discharge hole that opens in the gear chamber.

A hydrodynamic torque converter (1) with a pump wheel (3) and with a turbine wheel (4), and with a torsion damper (8) and with an intermediate space (12) located between the turbine wheel (4) and the torsion damper (8), and with a torus formed by the pump wheel (3) and the turbine wheel (4) for hydraulic fluid. A flow-guiding wall (14) is provided, which deflects a radially outward flow of hydraulic fluid coming from the torus, back radially inward to the intermediate space (12).

A transmission including a rotating shaft, a planetary gear mechanism, a friction engagement device disposed on radial outside of a ring gear of the planetary gear mechanism, a plate attached to the ring gear so as to face an outer circumferential surface of the ring gears, and a restriction member attached to the ring gear to restrict a movement of the plate in an axial direction. A first oil hole is formed at the ring gear so as to lead an oil supplied from an oil passage inside the rotating shaft to an outside of the ring gear in the radial direction, and a second oil hole is formed at the plate so as to lead the oil led through the first oil hole to the friction engagement device.

A powertrain-cooling system of a hybrid vehicle may include an electric oil pump, a pressure control valve, which includes an input port receiving fluid discharged from the electric oil pump, an output port outputting the fluid to a transmission while adjusting the pressure of the fluid, and a drain port discharging a portion of the fluid in accordance with adjustment of the pressure of the fluid, a first motor cooling path connecting the drain port of the pressure control valve to a first motor forming a hybrid powertrain, and a controller electrically connected to the electric oil pump and configured for controlling the electric oil pump to cool the transmission and the first motor.

A work vehicle locking differential energy management system includes axle speed sensors for monitoring the rotational speeds of axle half-shafts. The axle half-shafts are coupled through a locking differential, which contains a differential clutch mechanism. A processing subsystem is configured to: (i) when the locking differential is placed in a locked state, calculate a differential lock force applied to the clutch mechanism, and calculate a differential slip speed from a disparity in the rotational speeds of the axle half-shafts; (ii) estimate an internal temperature of the clutch mechanism based, at least in part, on the differential lock force and the differential slip speed; (iii) detect differential overtemperature events during which the internal temperature of the clutch mechanism exceeds a first critical temperature threshold; and (iv) perform at least one differential overtemperature action in response to detection of a differential overtemperature event.

Proposed is a system for operating and lubricating a clutch of a work vehicle. The system includes a forward-backward switching clutch portion connected to a first transmission hydraulic line, a main transmission clutch portion connected to the first transmission hydraulic line so as to be disposed in parallel with the forward-backward switching clutch portion, an auxiliary transmission clutch portion connected to a second transmission hydraulic line disposed in parallel with the first transmission hydraulic line, and a lubricating oil supply portion configured to supply oil as a lubricant to each clutch friction element. The lubricating oil supply portion includes a clutch lubrication valve unit, and is configured to always allow oil supply to the clutch friction elements of each of the main transmission clutch portion and the auxiliary transmission clutch portion, and is configured to intermittently allow oil supply to the clutch friction element of the forward-backward switching clutch portion.

An automatic transmission includes a clutch device having a clutch hub, a clutch drum, a friction plate, a piston, and a hydraulic chamber. The clutch drum includes an outer-side cylindrical portion, a disc-shaped first radial portion extending radially inwardly, an axial portion extending axially from the first radial portion, and a disc-shaped second radial portion extending radially inwardly from the axial portion. The piston includes a pressing portion disposed between the first radial portion and the friction plate side, and a disc-shaped piston radial portion extending radially inwardly from the pressing portion. The hydraulic chamber is provided radially inwardly from the axial portion and on the non-friction-plate side of the piston radial portion. A comb-teeth portion is provided at a radially intermediate portion of the piston radial portion. The axial portion and the piston radial portion intersect with each other in a comb-teeth shape.

Drivetrain systems and methods are provided. In one example, the drivetrain system includes an interaxle differential (IAD) configured to receive power from a prime mover, a motor configured to drive a planetary gearset, and a ball ramp actuator configured to selectively engage a plurality of plates in a clutch pack of a friction clutch in response to receiving rotational input from the planetary gearset. In an engaged configuration, the friction clutch prevents speed differentiation between a first IAD output and a second IAD output.