In a hydraulic control device switchable between a first state in which a first oil is supplied from a first pump to a hydraulic operation part via a bypass valve and a second state in which the first oil supplied from the first pump is pressurized by using the second pump and the pressurized first oil is supplied, as a second oil, to the hydraulic operation part, control that adds a correction hydraulic pressure of a predetermined amount to the hydraulic pressure of the oil discharged from a valve for adjusting the pressure of the oil supplied to the hydraulic operation part is performed when the second state is switched to the first state due to a stop or a low rotation state of the second pump.

The continuously variable transmission includes a transmission case having a side cover, a housing, and a case sandwiched between the side cover and the housing, an oil pump disposed in the transmission case, and a pair of gears disposed in the transmission case. An axial rib having a linear shape extending from the side cover toward the housing is formed on an outer wall surface of the case at a position adjacent to the pair of gears. The axial rib is positioned on a straight line extending from the oil pump in the vertical direction and is locally positioned at a position where the meshing reaction force of the pair of gears is suppressed.

Methods and systems for a transmission are provided herein. In one example, a hydraulic system is provided that includes a boost pump, a relief valve in fluidic communication with the boost pump and a reservoir, and a plurality of control valves in fluidic communication with the boost pump, positioned downstream of the relief valve, and in fluidic communication with a plurality of hydraulic devices. The hydraulic system further includes a controller designed to actively adjust a position of the relief valve based on an aggregate hydraulic pressure demand of the plurality of hydraulic devices to alter a boost pressure of a hydraulic fluid supplied to the plurality of control valves.

A motor vehicle transmission including an input shaft (AN), an output shaft (AB), a power take-off (1) and a hydraulic pump (2). The hydraulic pump (2) serves to supply the motor vehicle transmission with hydrodynamic working pressure. The power take-off (1) has a power take-off gearwheel (1A). The power take-off gearwheel (1A) is connected to the hydraulic pump (2) in order drive the hydraulic pump (2).

A power supply controller includes a driver having a circuit board and controlling an operation of an electric oil pump, a control unit controlling power supply to the driver, a board temperature sensor detecting a temperature of the circuit board; and an oil temperature sensor detecting a temperature of a working oil of a transmission as an oil temperature. The control unit executes energization prohibition control for prohibiting power supply to the driver when the temperature of the circuit board detected by the board temperature sensor exceeds a predetermined first threshold temperature, and executes cancellation determination for determining whether to cancel the energization prohibition control based on the oil temperature detected by the oil temperature sensor during execution of the energization prohibition control.

A drive unit includes a motor, a torque converter, a torque transmission member, first and second transmission paths, first and second gear trains, and a controller. The torque converter amplifies torque directed in a first direction. The first transmission path transmits torque through the torque converter. The second transmission path transmits torque without through the torque converter. The first gear train outputs torque directed in the first direction as forward torque. The second gear train outputs torque directed in the first direction as reverse torque. The controller executes a first forward moving mode such that the motor is rotated in the first direction, and torque is outputted through the first transmission path and the first gear train. The controller executes a second forward moving mode such that the motor is rotated in a second direction, and torque is outputted through the second transmission path and the second gear train.

A transmission system has a housing including a wall and a gear support extending from the wall. The gear support has an outer surface and an inner surface defining a passage. The outer surface includes a seal receiving portion and a seal support axially spaced from the seal receiving portion. A seal is positioned about the gear support at the seal receiving portion. A sleeve is arranged on the outer surface of the gear support between the wall and the seal and a pump drive gear is mounted on the gear support and is supported by the sleeve. The pump drive gear includes an outer toothed surface, an inner surface, and a bushing arranged on the inner surface, the bushing extending about the sleeve.

A method of controlling an EOP of a hybrid vehicle may include controlling the EOP in a predetermined high-speed mode when the vehicle is started; controlling the EOP in a predetermined middle-speed mode in which the EOP is driven at revolutions per minute (RPM) lower than RPM of the high-speed mode when the high-speed mode is terminated; and controlling the EOP in a predetermined low-speed mode in which the EOP is driven at RPM lower than the RPM of the middle-speed mode when the vehicle is stopped.

Provided is a hydraulic control device in which in the rotation control of the second pump, the required discharge pressure of the second pump can be more reliably maintained below a predetermined pressure in the control that keeps the target rotation speed constant after the feedback control ends. In the rotation control of the second pump, in the control which keeps the target rotation speed constant after the feedback control ends, the rotation of the second pump is controlled by adding a predetermined addition rotation speed to the target rotation speed corresponding to the required discharge pressure. Since the required discharge pressure of the second pump can be maintained below a predetermined pressure in the fixed mode by the addition rotation speed, it can reliably obtain the effect of reducing the work load of the first pump and contribute to the improvement of the fuel efficiency of the vehicle.

Systems and apparatuses include a power shift transmission including a plurality of clutch valves, each clutch valve actuatable between an open position providing flow to a corresponding clutch pack and a closed position inhibiting flow to the corresponding clutch pack; and a hydraulic damping rail including a primary rail wall defining a primary rail volume, a rail inlet structured to provide communication of hydraulic fluid between a hydraulic pump and the primary rail volume, and a plurality of rail outlets, each rail outlet corresponding to one of the plurality of clutch valves and structured to provide communication between the primary rail volume and the corresponding one of the plurality of clutch valves.