A transmission of an internal combustion engine in which the shaft length of a main shaft can be shortened to eliminate a supporting wall around a reduction gear while a thrust load is received. Around a main shaft of a transmission of an internal combustion engine, a primary bearing is fastened to an inside of a primary driven gear, and is disposed between the primary driven gear and the main shaft. A collar member is disposed between the primary bearing and a main bearing. A step portion, in contact with the main bearing, is formed on the main shaft on an opposite side of the main bearing from the collar member. A cylindrical portion, an inner race of the primary bearing, the collar member, and an inner race of the main bearing are fastened to the side of the step portion.

Methods and systems for a vehicle transmission are provided herein. The vehicle transmission includes an input interface configured to mechanically couple to a motive power source. The vehicle transmission further includes a first disconnect device releasably mechanically coupling a first output to a first drive axle and a second disconnect device releasably mechanically coupling a second output to a second drive axle.

Methods and systems for a vehicle transmission are provided herein. The vehicle transmission includes an input interface configured to mechanically couple to a motive power source. The vehicle transmission further includes a first disconnect device releasably mechanically coupling a first output to a first drive axle and a second disconnect device releasably mechanically coupling a second output to a second drive axle.

A clutch that includes a friction plate; a separator plate; a clutch hub; and a piston that presses the friction plate and the separator plate, wherein the clutch hub includes a hub on which an inner peripheral portion of the friction plate or the separator plate is fitted, a tubular shaft that movably supports the piston, and an engagement oil chamber defining wall that together with the piston defines an engagement oil chamber to which an engagement oil pressure is supplied, the hub is spline-fitted on a gear of a planetary gear so as to rotate with the gear, and the tubular shaft is rotatably supported by a central shaft and is fitted by a spigot joint in the gear.

A clutch that includes a friction plate; a separator plate; a clutch hub; and a piston that presses the friction plate and the separator plate, wherein the clutch hub includes a hub on which an inner peripheral portion of the friction plate or the separator plate is fitted, a tubular shaft that movably supports the piston, and an engagement oil chamber defining wall that together with the piston defines an engagement oil chamber to which an engagement oil pressure is supplied, the hub is spline-fitted on a gear of a planetary gear so as to rotate with the gear, and the tubular shaft is rotatably supported by a central shaft and is fitted by a spigot joint in the gear.

A friction clutch assembly includes a friction clutch having at least two coupling elements coupled to each other and disposed axially movable with respect to each other. Immediately adjacent coupling elements are each assigned to two sides of a power path defined by the coupling of the at least two coupling elements. An intermediate element is provided on which the coupling elements of one side of the power path are held movably in an axial direction of the coupling elements. The intermediate element is switchable between a locked state and a free-running state. An actuator element opens and closes the friction clutch. In a free-running state, a free rotation of the held coupling elements with respect to the assigned side of the power path is permitted, and in a locked state the held coupling elements are blocked from free rotation.

A drive assembly has a drive housing with a gear set and a wheel mount configured to rotate about a rotation axis on a wheel bearing assembly. A clutch component is mounted to a clutch hub and disposed between an input shaft and the gear set to selectively cause rotation of the wheel mount. A clutch actuation assembly moves the clutch component into energized and de-energized states with respect to the input shaft. The clutch actuation assembly has a spring to position the clutch component in one of the energized and de-energized states and a piston to position the clutch component in the other of the energized and de-energized states. The clutch actuation assembly has a reaction plate that is acted upon in a first axial direction by the spring and is acted upon by the piston in a second axial direction.

A dry double clutch for an electric axle includes a clutch unit and an actuation unit. The clutch unit has a first clutch device for connecting a drive shaft with a first output shaft, and a second clutch device, coaxial to the first clutch device, for connecting the drive shaft with a second output shaft. The actuation unit has a first actuation device for actuating the first clutch device, and a second actuation device for actuating the second clutch device. The first clutch device is closed when the first actuation device is not actuated, and the second clutch device is open when the second actuation device is not actuated. The first clutch device is arranged to be opened by a first pressure force from the first actuation device, and the second clutch device is arranged to be closed by a second pressure force from the second actuation device.

A dry double clutch for an electric axle includes a clutch unit and an actuation unit. The clutch unit has a first clutch device for connecting a drive shaft with a first output shaft, and a second clutch device, coaxial to the first clutch device, for connecting the drive shaft with a second output shaft. The actuation unit has a first actuation device for actuating the first clutch device, and a second actuation device for actuating the second clutch device. The first clutch device is closed when the first actuation device is not actuated, and the second clutch device is open when the second actuation device is not actuated. The first clutch device is arranged to be opened by a first pressure force from the first actuation device, and the second clutch device is arranged to be closed by a second pressure force from the second actuation device.

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.