In a transmission with a lockup clutch, in a case where zero-slip control of the lockup clutch is not established (converged) within a predetermined time, a sweep increase of a lockup clutch hydraulic pressure starts at an increase rate smaller than a normal increase rate in a case where the zero-slip control is established within the predetermined time, the increase rate until the end of the sweep increase is set to be equal to or less than the normal increase rate, and in addition, a hydraulic pressure at the time of the end of the sweep increase is set to be equal to or greater than a hydraulic pressure in a case where the zero-slip control is established within the predetermined time. With such control, in a case where the zero-slip state is not brought, suppressing the occurrence of shock when complete engagement is carried out.

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 and a damper portion. The clutch portion includes a clutch plate and transmits the torque from the front cover toward the turbine. The damper portion includes an elastic member, a holding member and an output-side member. The elastic member attenuates a fluctuation in the torque. The holding member holds the elastic member and is provided with an engaging part integrated therewith. The engaging part is engaged with the clutch plate. The output-side member is rotatable relatively to the holding member within a range of a predetermined angle. The output-side member transmits the torque toward the turbine when the torque is transmitted to the elastic member through the holding member.

A torque converter assembly includes a torsional vibration damper and a clutch operatively coupled to the torsional vibration damper. The clutch includes a friction disc having a tab coupled to a distal portion of the friction disc and extending axially away from the distal portion. The clutch also includes a piston configured to urge the friction disc into engagement with a torque converter cover to transfer torque from the torque converter cover to the torsional vibration damper. The tab includes a first segment directly contacting a spring member or a spring seat of the torsional vibration damper and a second segment, between the first segment and the distal portion of the friction disc, configured to slide against a guide surface of the plate torsional vibration damper to provide radial guidance to the friction disc.

A torque converter assembly includes a torsional vibration damper and a clutch operatively coupled to the torsional vibration damper. The clutch includes a friction disc having a tab coupled to a distal portion of the friction disc and extending axially away from the distal portion. The clutch also includes a piston configured to urge the friction disc into engagement with a torque converter cover to transfer torque from the torque converter cover to the torsional vibration damper. The tab includes a first segment directly contacting a spring member or a spring seat of the torsional vibration damper and a second segment, between the first segment and the distal portion of the friction disc, configured to slide against a guide surface of the plate torsional vibration damper to provide radial guidance to the friction disc.

An arrangement with at least one component (1) for a transmission of a vehicle is provided. The component (1) has an annular cylindrical interior (3) and is rotationally fixedly and axially movably connected to an input shaft (2). The component (1) has at least one passage bore (4) for hydraulic pressure balancing. The annular cylindrical interior (3) of the component (1) has at least one interior contour (5A, 5B) assigned to the passage bore (4) as an area reducing a stress concentration.

An arrangement with at least one component (1) for a transmission of a vehicle is provided. The component (1) has an annular cylindrical interior (3) and is rotationally fixedly and axially movably connected to an input shaft (2). The component (1) has at least one passage bore (4) for hydraulic pressure balancing. The annular cylindrical interior (3) of the component (1) has at least one interior contour (5A, 5B) assigned to the passage bore (4) as an area reducing a stress concentration.

A shaft (W) for a motor vehicle transmission (G) may have axial bore holes positioned within the shaft and configured to guide fluid within the shaft. The shaft may have first, second, and third axial sections (W1, W2, W3), the second axial section being axially between the first and third axial sections. Fluid enters the axial bore holes in the second axial section and exits the axial bore holes in the first and third axial sections. One of the axial bore holes (B2; B1, B1a) is arranged, at least partially, in the first axial section and is radially spaced from an axis of rotation (WA) of the shaft. Another of the axial bore holes (B1RS; B_SE5, B3a) is arranged, at least partially, in the third axial section. The one of the axial bore holes (B2; B1, B1a) is coaxial with the other of the axial bore holes (B1RS; B_SE5, B3a).

A wet clutch system includes fluid-flow apertures in the clutch piston which allow for reduction of oil shear forces between rotating clutch plates and a stationary piston. In particular the apertures pass through the piston in the area of the piston's engagement with the clutch plates. When the piston is in its deactivated position and spaced from the clutch plates, the radially-outward position of these apertures allows high-pressure, centrifugally-driven clutch fluid to migrate away from the clutch plates through the piston to a backfill cavity on the opposite side of the piston. An air-inlet aperture may be provided in or near the clutch hub to facilitate this oil migration.

An automatic transmission includes a clutch having a drum section, a hub, a friction plate, a piston that presses the friction plate, a hydraulic chamber to which hydraulic oil is supplied to urge the piston in a direction toward the friction plate, and a cancellation chamber to which hydraulic oil is supplied to cancel a centrifugal hydraulic pressure applied to the hydraulic oil in the hydraulic chamber, and the piston is interposed between the hydraulic chamber and the cancellation chamber. The drum section includes communication passages that extend in a radial direction and respectively communicate with the hydraulic chamber and the cancellation chamber. Of the communication passages, in the communication passage that communicates with the cancellation chamber, an adjustment member is provided at an end portion on a radially inner side, and can adjust an atmospheric air release position of the communication passage in the radial direction.

A torque converter assembly includes a torsional vibration damper and a clutch operatively coupled to the torsional vibration damper. The clutch includes a friction disc having a tab coupled to a distal portion of the friction disc and extending axially away from the distal portion. The clutch also includes a piston configured to urge the friction disc into engagement with a torque converter cover to transfer torque from the torque converter cover to the torsional vibration damper. The tab includes a first segment directly contacting a spring member or a spring seat of the torsional vibration damper and a second segment, between the first segment and the distal portion of the friction disc, configured to slide against a guide surface of the torsional vibration damper to provide radial guidance to the friction disc.