A control device for an automatic transmission is provided, which includes a vehicle-propelling friction engagement element configured to be engaged when a vehicle starts traveling, an other friction engagement element, a vehicle-propelling friction engagement element temperature detector configured to detect a temperature of the vehicle-propelling friction engagement element, an input torque detector configured to detect an input torque inputted into the automatic transmission, and a control unit comprising a lubricant supply control logic configured to control supply of lubricant to the vehicle-propelling friction engagement element and the other friction engagement element. The lubricant supply control logic switches the supply amount of lubricant to the vehicle-propelling friction engagement element according to the temperature of the vehicle-propelling friction engagement element, and switches the supply amount of lubricant to the another friction engagement element according to the input torque.

Provided is a structure for lubricating a clutch, the structure including: an oil capturing groove provided along an inner circumference of a ring gear at one side of a pinion gear; and an oil hole connected to an inside of a clutch hub through the oil capturing groove.

An oil feed structure includes: a hydraulic clutch; a power transmitting shaft coupled to the hydraulic clutch; a valve element inserted into the power transmitting shaft, and a spring configured to bias the valve element. The valve element includes: a pressure receiving surface facing in an axial direction of the power transmitting shaft and configured to receive hydraulic pressure of a hydraulic pressure oil passage; and a port communicable with a clutch lubrication hole of the power transmitting shaft. The spring biases the valve element toward the hydraulic pressure oil passage against the hydraulic pressure received by the pressure receiving surface. When clutch operating hydraulic pressure changes, the valve element moves in the axial direction to change an opening degree of communication between the port and the clutch lubrication hole.

A drive assembly includes a housing, upper and lower shafts, a friction pack, and a pair of meshed gears. The housing defines a receptacle containing a volume of lubricating fluid, a brake chamber with a metering orifice in a lower portion of the brake chamber, and an exit port at an upper portion of the brake chamber. The upper and lower shafts are within the housing at different elevations and configured for rotation. The friction pack is within the brake chamber and driven to rotate by the upper shaft. The pair of meshed gears is driven to rotate by one or more of the upper and lower shafts, and the gears communicate lubricating fluid from the receptacle to the lower portion of the brake chamber through the metering orifice. Rotation of the friction pack pumps lubricating fluid to the exit port at the upper portion of the brake chamber.

A clutch device includes a case, a clutch housing, a multi-disc clutch, and a rolling bearing. The clutch housing is housed in the case. The clutch housing includes a cylindrical portion including a housing space defined in the cylindrical portion, and a wall extending radially inward from an end of the cylindrical portion. The multi-disc clutch is housed in the housing space and includes a plurality of clutch plates. The rolling bearing includes an inner ring, an outer ring, and a plurality of rolling elements disposed between the inner and outer rings. The inner ring of the rolling bearing is attached to an inner ring attachment portion of the case. The outer ring of the rolling bearing is attached to an outer ring attachment portion of the wall of the clutch housing. The rolling bearing supports the clutch housing such that the clutch housing is rotatable relative to the case.

A pumpless lubrication system for a power transfer assembly equipped with a hypoid gearset having a ring gear and a hollow pinion unit. Lubricant splashed from one of the ring gear and the pinion unit is collected in a collection reservoir and directed through a conduit unit into the hollow pinion unit. The lubricant is delivered to a torque transfer coupling for lubricating and cooling a multi-plate clutch pack.

A hydraulically operated transmission includes: a pressure regulator which regulates pressure of a hydraulic oil supplied to a coupling hydraulic chamber of a frictional coupling element for starting a vehicle; and a lubrication control valve provided at a lubricant oil supplying circuit for supplying the lubricant oil to the frictional coupling element. The lubrication control valve operates, in coupling the frictional coupling element at start of the vehicle, such that the lubricant oil is supplied to the frictional coupling element at a greater flow rate when a regulated pressure regulated by the pressure regulator is lower than a second predetermined pressure, than when the regulated pressure is higher than or equal to the second predetermined pressure. The second predetermined pressure is set to be higher than or equal to a first predetermined pressure, at which the frictional coupling element is completely coupled, and to be lower than a high pressure.

A drive unit and a drive arrangement having the drive unit are provided. The drive unit includes a first electric machine and a second electric machine and an output shaft. A rotor of the second electric machine is connected to the output shaft for conjoint rotation and the drive unit has a separating clutch by which a rotor of the first electric machine is connected to the output shaft for torque transmission. The drive unit furthermore has a first flow system for implementing a flow of a first liquid for at least partial cooling of at least one electric machine and a second flow system for implementing a flow of a second liquid, the first flow system and the second flow system being arranged such that heat from the first liquid in the first flow system is transferred to the second liquid in the second flow system.

The invention is concerned with an oil consumer system having at least one rotating component and at least one oil supply from an oil tank, wherein the oil consumer system has an oil return to a first tank and an oil supply via at least one second tank.

An automatic transmission is provided, which includes a friction engaging element. The friction engaging element includes a plurality of friction plates disposed inside a transmission case, a piston configured to cause the plurality of friction plates to be engaged with each other, a spring configured to bias the piston, and a hydraulic chamber to which hydraulic fluid is supplied, the hydraulic fluid biasing the piston. The hydraulic chamber is disposed so as to overlap with the spring in a radially internal and external relationship.