摘要:
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. The method further includes disengaging the locking device from the first and second positioning holes of the first and second drums once mounting of the gear control device is completed.
摘要:
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. 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
摘要:
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.
摘要:
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.
摘要:
The hybrid propulsion system for an internal combustion engine having a mechanical gearbox and an electric machine. A gear shift device includes a plurality of sliding engagement sleeves, each arranged to connect a driven gearwheel for rotation with the respective secondary shaft, a corresponding plurality of sliding shift forks, each arranged to cause a respective engagement sleeve to slide between a neutral position and at least one shift position, a rotary drum having on its outer cylindrical surface a corresponding plurality of guide grooves in each of which a respective stud slidably engages for translation with a respective shift fork in the sliding direction of this latter, and an actuation unit arranged to cause the drum to rotate stepwise among a plurality of angular positions each corresponding to predetermined positions of the engagement sleeves.
摘要:
A transmission includes a first primary shaft carrying driving gearwheels associated to the odd gears and to the reverse gear, a second primary shaft coaxial to the first shaft and carrying driving gearwheels associated to the even gears, and at least one secondary shaft carrying a plurality of idle driven gearwheels directly or indirectly meshing with the driving gearwheels. The gearbox is also provided with a gear shift device having sliding engagement sleeves are each arranged to connect each time a driven gearwheel corresponding to a given gear for rotation with the respective secondary shaft. Corresponding sliding shift forks are each arranged to cause a respective engagement sleeve to slide between a neutral position and at least one shift position. A rotary drum has a corresponding guide grooves on its outer cylindrical surface in each of which a respective stud slidably engages, and is rigidly connected for translation with a respective shift fork in the sliding direction of the shift fork. An actuation unit is arranged to cause the drum to rotate stepwise among angular positions, each corresponding to predetermined positions of the engagement sleeves. The guide grooves of the drum are shaped so that in a first angular position the engagement sleeves are positioned to engage at the same time the second gear and the reverse gear.
摘要:
The hybrid propulsion system for an internal combustion engine having a mechanical gearbox and an electric machine. A gear shift device includes a plurality of sliding engagement sleeves, each arranged to connect a driven gearwheel for rotation with the respective secondary shaft, a corresponding plurality of sliding shift forks, each arranged to cause a respective engagement sleeve to slide between a neutral position and at least one shift position, a rotary drum having on its outer cylindrical surface a corresponding plurality of guide grooves in each of which a respective stud slidably engages for translation with a respective shift fork in the sliding direction of this latter, and an actuation unit arranged to cause the drum to rotate stepwise among a plurality of angular positions each corresponding to predetermined positions of the engagement sleeves.
摘要:
A gear change device for a motor vehicle includes a first and a second primary shaft coaxial with respect to each other, selectively connectable to the driving shaft of the motor vehicle, and a first and a second secondary shaft, whose axes are parallel and spaced from the common axis of said primary shafts. A fifth shaft is parallel and spaced with respect to the common axis of the two primary shafts and with respect to the axes of the two secondary shafts. A parking gear wheel is connected in rotation with the further pinion and cooperates with a locking device in a parking condition. The parking gear wheel is mounted freely rotatable around the axis of the fifth shaft. The parking gear wheel extends radially towards the first secondary shaft within the space between the first reverse gear wheel and a rolling bearing which rotatably supports the first secondary shaft. The bearing is axially interposed between the first reverse gear wheel and the output pinion of the first secondary shaft.
摘要:
A gearbox includes two coaxial primary shafts carrying fixed gearwheels acting as driving gearwheels of the gear trains associated with the forward gears and with the reverse gear, a secondary shaft carrying idle gearwheels acting as driven or intermediate gearwheels of the gear trains associated with the forward gears and with the reverse gear and a lay shaft, and a lay shaft carrying a fixed gearwheel acting as parking gearwheel. The lay shaft is permanently cinematically connected to the secondary shaft via a gear train comprising a first fixed gearwheel carried by the lay shaft, a second idle gearwheel coaxial with the two primary shafts and a third fixed gearwheel carried by the secondary shaft, the first and third fixed gearwheels meshing permanently with the second idle gearwheel.
摘要:
A gearbox includes two coaxial primary shafts, a secondary shaft and a lay shaft. The two primary shafts carry fixed gearwheels acting as driving gearwheels of the gear trains associated with the forward gears and with the reverse gear. The secondary shaft carries idle gearwheels acting as driven or intermediate gearwheels of the gear trains associated with the forward gears and with the reverse gear, and a final reduction pinion. The lay shaft carries a first idle gearwheel acting as driven gearwheel of a first gear train associated with the reverse gear, a second idle gearwheel acting as driven gearwheel of a second gear train associated with one of the forward gears, and a fixed gearwheel acting as parking gearwheel. The lay shaft is permanently kinematically connected to the secondary shaft via a third gear train having a first fixed gearwheel carried by the lay shaft, a second idle gearwheel coaxial with the two primary shafts and a third fixed gearwheel carried by the secondary shaft, the two fixed gearwheels of the third gear train meshing permanently both with the idle gearwheel of the third gear train.