A shaft (W) for a motor vehicle transmission (G) includes four axial bore holes (B1, B2, B3, B4) for conducting fluid within the shaft (W). A central axis of each of the four bore holes (B1, B2, B3, B4) is spaced apart from an axis of rotation (WA) of the shaft (W). A radial distance (r1) between the central axis of at least two of the four bore holes (B1, B2, B3, B4) and the axis of rotation (WA) differs from a radial distance (r2) between the central axis of one of the remaining bore holes and the axis of rotation (WA). A transmission (G) for a motor vehicle with a shaft (W) is also provided.

A control device for an automatic transmission is provided, which includes a friction engagement element, and a processor configured to execute gear change control logic configured to control a gear change operation by supplying and discharging hydraulic fluid for forming a gear stage to/from the friction engagement element, and lubricant supply control logic configured to control to switching operation of a supply amount of lubricant to the friction engagement element according to an operating state of a vehicle. The processor controls the gear change operation and the switching operation to not overlap with one another.

A work vehicle transmission includes a first transmission mechanism that changes input motive power to any one of multiple speeds, and a second transmission mechanism that changes the motive power changed by the first transmission mechanism to any one of multiple speeds, the number of speeds of the second transmission mechanism being smaller than that of the first transmission mechanism. Multiple speed change multi-disc clutches of the first transmission mechanism are arranged parallel with multiple deceleration multi-disc clutches of the second transmission mechanism so as to be adjacent in the diameter direction thereof.

In hydraulic systems having rotating-stationary component interfaces, a bore pressure regulating mechanism is provided to interact with the hydraulic fluid in a control volume to maintain a hydraulic fluid pressure in a longitudinal shaft bore at or approximately equal to a supply pressure when a gear shaft rotates within the control volume. In one aspect, the bore pressure regulating mechanism minimizes vortex flow of the hydraulic fluid induced by the rotation of the gear shaft. In another aspect, the bore pressure regulating mechanism provides a direct feed of pressurized hydraulic fluid proximate an opening of the longitudinal shaft bore through an end surface of the gear shaft, and thereby minimizes the opportunity for the hydraulic fluid to be forced into vortex flow by the gear shaft in the area of the longitudinal shaft bore.

A transmission device, wherein the compound planetary gear mechanism increases the speed of the power transmitted to the input element and transmits the resultant power to the first and the second output elements when the fixable element is non-rotatably held stationary by the first brake; and the first and the second clutches are disposed on a side closer in the axial direction to the compound planetary gear mechanism than the first and the second planetary gear mechanisms.

An oil supply device comprises a main pump driven by an engine and capable of supplying oil to an automatic transmission and to a hydraulic control valve, an electric motor, a subsidiary pump driven by the electric motor that raises the pressure of a portion of the oil discharged from the main pump and supplies the oil to the hydraulic control valve, and a motor controller which controls driving of the electric motor on the basis of the pressure of the oil supplied to the automatic transmission. The motor controller implements control to drive the subsidiary pump by the electric motor to raise the pressure of a portion of the oil discharged from the main pump to a prescribed pressure or above and supply the oil to the hydraulic control valve when the pressure of the oil supplied to the automatic transmission is less than the prescribed pressure.

A torque converter device and to a method for controlling a liquid circuit of a torque converter device. The torque converter device includes a housing arrangement and a hydrodynamic device arranged in the housing arrangement. The hydrodynamic device include an impeller wheel connected on the input side to a driveshaft via the housing arrangement, a turbine wheel connected to an output shaft, and a stator wheel. The wheels collectively form a circuit filled with a liquid, that can be supplied with liquid by an external supply device. The torque converter device is constructed such that it actuates at least one flow control element for controlling the flow of liquid for the torque converter device in the circuit actively and/or passively depending on a difference in speed between the impeller wheel and the turbine wheel of the hydrodynamic device.

A lockup device (63) includes a lockup clutch (64) for establishing connection between a rotating body (44) of a torque converter (41) and a transmission shaft (55), a lockup control valve (70) that controls supply/discharge of pressurized oil from a hydraulic pump (69) to/from the lockup clutch (64), and a lockup oil passage (75) that introduces pressurized oil from the lockup control valve (70) to the lockup clutch (64). The lockup control valve (70) is arranged on an outer side face (18B) of an intermediate casing (18) in a position of radially overlapping the transmission shaft (55) in a radial direction of the transmission shaft (55). Further, a casing side oil passage (76) constituting the lockup oil passage (75) is formed as a linear oil passage that linearly extends in the radial direction of the transmission shaft (55) between the lockup control valve (70) and the transmission shaft side oil passage (77).

A hydraulic pressure supply apparatus for automatic transmission having a first and a second regulator valves 50, 52 that are installed in a first and a second oil passages 46, 48 that connect a hydraulic pump 44 for pumping and discharging hydraulic oil from a reservoir 42 and a plurality of hydraulic actuators and depressurize the hydraulic oil discharged from the pump to pressure required by the hydraulic actuators, a third and a fourth oil passages 56, 58 that convey discharged hydraulic oil to lubrication system 54 and an ejector 60 having a nozzle 60a connected to one of the third and fourth oil passages and an intake 60b connected to the reservoir 42 such that hydraulic oil merged at a diffuser 60c is conveyed to the lubrication system 54 through a fifth oil passage 62, hydraulic energy generated by the hydraulic pump can be effectively utilized in an automatic transmission having the hydraulic actuators and lubrication system.

A valve is mounted in a first bore in a first separable section of a transmission to block or allow fluid flow through the first bore to a second bore in a second transmission section depending on whether the first and second sections are joined together or separated. A movable portion of the valve is responsive to an actuator during relative movement of the transmission sections to shift between fluid flow open and fluid flow closed positions. The valve can include a valve housing fixed in the first bore and a carrying plunger biased to the fluid blocking position and responsive to the actuator for movement to the fluid flow open position. The valve forms a fluid flow path between the first and second bores across the gap between the facing surfaces of the joined transmission sections.