Abstract: A gear change device for including a first and a second primary shaft, selectively connectable to a driving shaft of a motor vehicle by a double clutch engagement device, and a first and a second secondary shaft. A plurality of gear selector devices rotatably couples each of the freely rotatable gear wheels with the shaft on which it is mounted, and, at least one rotatable actuator drum, for controlling the selector devices, having a plurality of cam tracks. The selector devices include respective fork-like actuator members and each has a cam follower element engaged in a respective cam track of the respective actuator drum. Each pair of cam tracks adjacent to each other provided on an actuator drum controls fork-like actuator members which are associated to different secondary shafts and which have the can follower elements thereof engaged on the drum in positions angularly spaced with respect to each other.

Abstract: A rotary drum for a gear control device for a motor-vehicle gearbox is provided. The drum is rotatable about a rotation axis and includes two guide channels on a cylindrical lateral surface of the drum arranged to guide in a slidable manner at least one follower member. The rotary movement of the drum about the rotation axis is converted into translatory movement of said at least one follower member. A series of positioning notches are provided on the cylindrical lateral surface of the drum and spaced apart angularly along a circumference of the drum for snap-engagement by a stop member associated with the drum. The positioning notches are axially interposed between the two guide channels. Two rings of radial through-holes are provided on the cylindrical lateral surface of the drum, each axially interposed between the positioning notches and a respective guide channel.

Abstract: A method of mounting a first drum and a second drum of a double-drum sequential gear control device for a motor-vehicle gearbox in a predefined relative angular position, wherein in a mounted condition the first drum and the second drum are rotatably arranged about respective rotation axes parallel to but not coincident with each other, includes forming a first positioning hole in a first position of the first drum, forming a second positioning hole in a second position of the second drum, arranging the first drum and the second drum in the predefined relative angular position, locking the first drum and the second drum in the predefined relative angular position by engaging the first positioning hole and the second positioning hole with a locking device, and unlocking the first drum and the second drum once mounting of the gear control device is completed.

Abstract: A gear change device for including a first and a second primary shaft, selectively connectable to a driving shaft of a motor vehicle by a double clutch engagement device, and a first and a second secondary shaft. A plurality of gear selector devices rotatably couples each of freely rotatable gear wheels with the shaft on which it is mounted, and at least one rotatable actuator drum, for controlling the selector devices, having a plurality of cam tracks. The selector devices include respective fork-like actuator members and each has a cam follower element engaged in a respective cam track of the respective actuator drum. Each pair of cam tracks adjacent w each other provided on an actuator drum controls fork-like actuator members which are associated to different secondary shafts and which have the cam follower elements thereof engaged on the drum in positions angularly spaced with respect to each other.

Abstract: A rotary drum for a gear control device for a motor-vehicle gearbox. The drum is rotatable about a rotation axis and includes two guide channels on a cylindrical lateral surface of the drum arranged to guide in slidable manner at least one follower member. The rotary movement of the drum about the rotation axis is converted into translatory movement of said at least one follower member. A series of positioning notches are provided on the cylindrical lateral surface of the drum and spaced apart angularly along a circumference of the drum for snap-engagement by a stop member associated with the drum. The positioning notches are axially interposed between the two guide channels.

Abstract: A method of mounting a first drum and a second drum of a double-drum sequential gear control device for a motor-vehicle gearbox in a predefined relative angular position is provided. In a mounted condition, the first drum is rotatably arranged about a first rotation axis and the second drum is rotatably arranged about a second rotation axis parallel to but not coincident with the first rotation axis. The method includes forming a first positioning hole in a first position of the first drum and forming a second positioning hole in a second position of the second drum. The method also includes arranging the first drum and the second drum in the predefined relative angular position and locking the first drum and the second drum in the predefined relative angular position. The locking includes engaging the first and second positioning holes with a locking device.