Patent application number | Description | Published |
20080210031 | SERVO-ASSISTED GEARSHIFT CONTROL DEVICE FOR A MOTOR-VEHICLE DUAL-CLUTCH TRANSMISSION - The device comprises four shift forks, each slidable among a first engagement position, a second engagement position and an intermediate neutral position between the two engagement positions, and an operating unit comprising four double-acting hydraulic actuators identical to each other and arranged to control each the displacement of a respective shift fork among the two engagement positions and the neutral position. The operating unit further comprises a support plate having holes for fixing to the gear case, and an actuator block accommodating the hydraulic actuators. The support plate and the actuator block are integrated to form a single body. In the assembled condition of the operating unit on the gear case, the actuator block is disposed on the side of the support plate facing towards the inside of the gear case. | 09-04-2008 |
20080210032 | ELECTRO-HYDRAULIC CONTROL SYSTEM FOR A MOTOR-VEHICLE DUAL-CLUTCH TRANSMISSION - The electro-hydraulic control system comprises a gear shift control device and a hydraulic control circuit. The gear shift control device includes four shift forks, operatively associated each to a respective engagement sleeve of the transmission to cause this latter to move between first and second engagement positions, and an operating unit comprising four double-acting hydraulic actuators arranged to control each the displacement of a respective shift fork. The hydraulic control circuit comprises a supply unit, a distributor valve adapted to select every time one of the four hydraulic actuators and two solenoid valves adapted to control the hydraulic actuator selected by the distributor valve. The distributor valve has four operating positions, each of which corresponds to the selection of a respective hydraulic actuator. The two solenoid valves are arranged to be connected each to a respective pressure chamber of the hydraulic actuator selected by the distributor valve. | 09-04-2008 |
20090107279 | MOTOR VEHICLE GEARBOX - The gearbox comprises a case, a stationary rod supported by the cas, a gear selector fork mounted slidably on the stationary rod and an end-of-travel bush mounted on the stationary rod so as to provide an axial abutment surface for the gear selector fork. The gear selector fork includes a sheet-metal body forming integrally a pair of support plates each having a respective guide through-hole. One of the guide through-holes is provided with a guide bush formed by means of overmoulding of low-friction plastic and is guided along the stationary rod. The other guide through-hole has no guide bush and is guided along a smaller-diameter portion of the end-of-travel bush. | 04-30-2009 |
20090114050 | GEAR SELECTOR FORK FOR A MOTOR VEHICLE GEARBOX - The gear selector fork comprises a body forming a pair of support plates having respective coaxial through-holes for supporting the fork slidably along a stationary rod of the gearbox, a pair of prongs fixed to the body and forming at their distal ends respective actuating portions able to operate a sliding coupling sleeve of the gearbox, and an actuating nose fixed to the body so as to impart to the fork the sliding movement along the stationary rod for engagement of the desired gear. The body and the prongs are formed so as to allow two forks with identical body and prongs to be mounted on the same stationary rod being superimposed at least partially in the direction of sliding along the stationary rod. The prongs are welded to one of the support plates of the body and extend on the same side as the zone where they are welded to the body, relative to the axis of the through-holes. | 05-07-2009 |
20090151495 | ELECTRO-HYDRAULIC CONTROL APPARATUS FOR A MOTOR-VEHICLE TRANSMISSION WITH AT LEAST FIVE FORWARD GEARS AND ONE REVERSE GEAR - The control apparatus comprises, in its version intended for a double-clutch transmission with six or seven forward gears and one reverse gear, a first shift fork for engaging the first gear or the third gear, respectively, a second shift fork for engaging the reverse gear or the fifth gear, respectively, a first hydraulic actuator arranged to control the movement of the first shift fork, a second hydraulic actuator arranged to control the movement of the second shift fork, a selection slide valve which can be moved into a first operating position in which the first hydraulic actuator is selected and a second operating position in which the second hydraulic actuator is selected, a pilot solenoid valve for controlling the movement of the slide valve between the first and second operating positions, and first and second gear shift solenoid valves for controlling the supply of fluid to the hydraulic actuator each time selected by the slide valve or the connection of said actuator with a tank. The slide valve is configured in such a manner that the first and second operating positions are end-of-travel positions, wherein the first operating position is a rest position, in which the pilot solenoid valve does not generate any hydraulic pilot control signal and the slide valve is held by resilient means against a first mechanical stop, and wherein the second operating position is a maximum-control position, in which the pilot solenoid valve generates a hydraulic control signal such that the slide valve is brought against a second mechanical stop opposite to the first one. | 06-18-2009 |
20100005917 | SEQUENTIAL CONTROL DEVICE WITH ROTATING DRUM FOR ENGAGING GEARS IN A MECHANICAL GEARBOX OF A MOTOR VEHICLE, PARTICULARLY OF A MOTOR CAR - The device comprises a drum mounted rotatably about an axis of rotation and having a plurality of guide grooves on its outer surface, and a corresponding plurality of engagement forks, each including a supporting portion supported slidably on the outer surface of the drum, a drive portion designed to drive a corresponding synchronizing sleeve of the gearbox, and a pin engaging in a corresponding guide groove of the drum. The guide grooves are shaped so as to produce, as a result of the rotation of the drum, a selective movement of the pins, together with the corresponding engagement forks, parallel to the axis of rotation of the drum according to predetermined operating modes, to cause each time the engagement of a given gear. The pins are positioned, with respect to the axis of rotation of the drum, on the same side of the drive portion of the engagement forks. A through groove is provided on the outer surface of the drum and extends parallel to the axis of rotation from an end of the drum to at least the guide groove farthest from that end, so as to guide the pins of the engagement forks when these latter are mounted on the drum. | 01-14-2010 |
20110113907 | MOTOR-VEHICLE HYBRID PROPULSION SYSTEM INCLUDING A DOUBLE-CLUTCH TRANSMISSION WITH GEAR SHIFT DEVICE COMPRISING A ROTARY DRUM - 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. | 05-19-2011 |
20110113909 | GEARBOX FOR A MOTOR-VEHICLE DOUBLE CLUTCH TRANSMISSION - 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. | 05-19-2011 |
20110113922 | MOTOR-VEHICLE DOUBLE-CLUTCH TRANSMISSION WITH GEAR SHIFT DEVICE COMPRISING A ROTARY DRUM AND MOTOR-VEHICLE HYBRID PROPULSION SYSTEM INCLUDING SUCH A TRANSMISSION - 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. | 05-19-2011 |
20110113923 | HYBRID PROPULSION SYSTEM FOR A MOTOR VEHICLE - The propulsion system includes an internal combustion engine, an electric machine and a double-clutch transmission with a clutch unit and a mechanical gearbox. The gearbox has two coaxial primary shafts intended to be torsionally connected each to a shaft of the internal combustion engine of the motor vehicle by a respective friction clutch of the clutch unit, as well as a secondary shaft and a lay shaft arranged parallel to the two primary shafts. The electric machine is permanently kinematically connected to either of the two primary shafts via a first gear train including a pinion mounted on an output shaft of the electric machine, an intermediate gearwheel mounted on an intermediate shaft and a gearwheel mounted on the primary shaft and acting as driving gearwheel of a second gear train of the gearbox associated to one of the gears, in particular to the second forward gear. The gearbox further includes a casing and the electric machine is inserted and fixed into a seat formed by that casing. An outer surface of a stator of the electric machine forms a spiral-shaped profile which serves as cooling circuit for the electric machine and is closed on the radially outer side by an inner cylindrical surface of the seat, in such a manner that the channels of the cooling circuit are defined between the spiral-shaped profile and the inner cylindrical surface. | 05-19-2011 |
20110265601 | HYBRID PROPULSION SYSTEM FOR A MOTOR VEHICLE WITH A DOUBLE-DRUM GEAR CONTROL DEVICE - A hybrid propulsion system includes a combustion engine, a gearbox, and an electric machine kinematically connected to the gearbox by a first drive transmission mechanism having a pinion carried by an output shaft of the electric machine, one of the gears of the gearbox and an intermediate gear. The gearbox has a gear control device and first and second shafts on which are mounted idle gears and slidable engagement sleeves, each associated with one or two idle gears to connect them for rotation with the respective first or second shaft. The gear control device has a first drum control device associated with the first shaft, a second drum, control device associated with the second shaft, and an actuation unit which is arranged to bring about rotation of the first and second drum control devices in a synchronized manner. The actuation unit has a motor device and a second drive transmission mechanism in turn having a first gear associated with the first drum control device, a second gear associated with the second drum control device, and an intermediate gear, the first or second gear meshing with an output pinion of the motor device and the intermediate gear meshing with the first gear and with the second gear. The intermediate gear of the second drive transmission mechanism is coaxial with the intermediate gear of the first drive transmission mechanism. | 11-03-2011 |
20120079903 | GEAR CHANGE DEVICE FOR A MOTOR VEHICLE - 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 by means of a double clutch engagement device, and a first and a second secondary shaft, whose axes are parallel and spaced from the common axis of said primary shafts, and having respective output gear wheels intended to mesh with the gear wheel of a differential. A plurality of pairs of gear wheels correspond to a plurality of forward gear ratios and to at least one reverse gear ratio. The gears of each pair are one rigidly connected in rotation with one of the primary shafts or with one of the secondary shafts while the other is freely rotatable respectively on one of the secondary shafts or on one of the primary shafts. A parking gear wheel is operatively connected to said first secondary shaft cooperating with a lock device for locking the gear change device in the parking condition. The parking gear wheel is rotatably mounted on a fourth axis, parallel and spaced both with respect to the common axis of the two primary shafts and with respect to the axes of the two secondary shafts. | 04-05-2012 |
20120234119 | GEAR CHANGE DEVICE FOR A MOTOR VEHICLE - 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. | 09-20-2012 |
20130312561 | ELECTRO-HYDRAULIC CONTROL APPARATUS FOR A MOTOR-VEHICLE TRANSMISSION WITH AT LEAST FIVE FORWARD GEARS AND ONE REVERSE GEAR - An electro-hydraulic control apparatus for a motor-vehicle transmission having at least five forward gears and one reverse gear, including first, second and third shift forks, each movable in at least one engagement position to engage a respective gear, first, second and third hydraulic actuators each arranged to control the movement of a respective shift fork in the respective at least one engagement position, and a slide valve selectively movable into one of at least three operating positions in each of which the slide valve selects a respective hydraulic actuator, wherein a first operating position is an end-of-travel position and corresponds to the selection of the first hydraulic actuator, and wherein a second operating position is also an end-of-travel position and corresponds to the selection of the second hydraulic actuator. | 11-28-2013 |
20140076079 | GEAR CHANGE DEVICE FOR MOTOR-VEHICLES - A gear change device for a motor vehicle has a braking member for stopping a rotation of a primary shaft before engagement of a reverse gear. The braking member includes a lever pivotally mounted on a gearbox about a separate axis with respect to axes of the primary and secondary shafts of the gear change device. The braking lever is controlled by an electrically-driven actuator by a pusher member displaceable by the actuator in a direction substantially tangential with respect to the primary shaft, towards an operative position in which it interposes with a wedge-like action between the braking lever and a fixed abutment wall, so as to press the brake pad against a cooperating part which is connected in rotation with the primary shaft. | 03-20-2014 |
20140083227 | DEVICE FOR SELECTION AND ENGAGEMENT OF THE GEARS OF A GEARBOX FOR MOTOR VEHICLES - A device for selection and engagement of the gears of a gearbox for motor vehicles has a control shaft mounted rotatable and axially movable with respect to the casing. Mounted on the shaft is a hub having an engagement finger for controlling gear engagement devices, which is configured to oscillate in the space between two fingers of a selection mask, which is mounted on the shaft axially movable therewith and is guided with respect to the casing so as not to follow rotation of the shaft and the hub when a gear is engaged. During displacement of the engagement finger towards an extreme position preliminary to the engagement of the reverse gear, the selection mask is forced to move temporarily into a rotated position, wherein it actuates one or more of the selector devices of the forward gears to enable silent engagement of the reverse gear. | 03-27-2014 |
20140171248 | GEAR-CHANGE DEVICE FOR A MOTOR VEHICLE - A gear-change device includes a primary shaft, a secondary shaft, and a third shaft, which bears both a gear of the reverse and an output pinion meshing with a gear of a differential. The third shaft is connected via a gear reducer to the shaft of an electrical machine, the casing of which is rigidly connected to the easing of the gear-change device. | 06-19-2014 |
Patent application number | Description | Published |
20090157271 | ELECTRO-HYDRAULIC CONTROL APPARATUS FOR A MOTOR VEHICLE TRANSMISSION WITH AT LEAST FIVE FORWARD GEARS AND ONE REVERSE GEAR - The control apparatus comprises, in its version intended for a double-clutch transmission, first, second and third shift forks each movable between first and second engagement positions to engage a respective gear, of which the first shift fork is able to engage at least the first gear and the second shift fork is able to engage at least the second gear, first, second and third double-acting hydraulic actuators arranged to control each the movement of a respective shift fork between the first and second engagement position, of which the first hydraulic actuator is associated to the first shift fork and the second hydraulic actuator is associated to the second shift fork, a slide valve selectively movable into one of at least three operating positions in each of which the slide valve selects a respective hydraulic actuator, and first and second gear shift solenoid valves for controlling the supply of fluid to the hydraulic actuator each time selected by the slide valve or the connection of that actuator to a tank. The first shift fork is moved into the engagement position of the first gear upon energization of the first gear shift solenoid valve, whereas the second shift fork is moved into the engagement position of the second gear upon energization of the second gear shift solenoid valve. | 06-18-2009 |
20110296690 | METHOD FOR THE MOUNTING, IN THE CORRECT RELATIVE ANGULAR POSITION, OF A PAIR OF ROTARY DRUMS OF A DOUBLE-DRUM SEQUENTIAL GEAR CONTROL DEVICE FOR A MOTOR-VEHICLE GEARBOX - 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. | 12-08-2011 |
20110296934 | ROTARY DRUM FOR A GEAR CONTROL DEVICE FOR A MOTOR-VEHICLE GEARBOX AND A GEAR CONTROL DEVICE FOR A MOTOR-VEHICLE GEARBOX HAVING SUCH A DRUM - 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 | 12-08-2011 |
20130055706 | ELECTRO-HYDRAULIC ACTUATION GROUP FOR AN AUTOMOTIVE SERVO-ASSISTED MECHANICAL TRANSMISSION - In an automotive servo-assisted mechanical transmission, an electro-hydraulic actuation group has an actuation unit, a power unit able to provide hydraulic pressure to the actuation unit and an electronic control unit, the actuation and power units being equipped with respective components that are all mounted on a hydraulic casing of the actuation unit so as to define with one another a single assembly structurally separated from the electronic control unit, at least part of the components being equipped with respective electrical connectors that are arranged in a manner such that they can all be engaged by a same multiple electrical connector device. | 03-07-2013 |
20130055840 | ELECTRO-HYDRAULIC ACTUATION GROUP FOR AN AUTOMOTIVE SERVO-ASSISTED MECHANICAL TRANSMISSION - In an automotive servo-assisted mechanical transmission, an electro-hydraulic actuation group has an actuation unit, a power unit able to provide hydraulic pressure to the actuation unit and an electronic control unit, the actuation and power units being equipped with respective components that are all mounted on a hydraulic casing of the actuation unit so as to define with one another a single assembly, at least part of the components being equipped with respective electrical connectors that are arranged in a manner such that they can all be engaged by a same multiple electrical connector device, electrically connectable to the electronic control unit. | 03-07-2013 |
20130091984 | MOTOR-VEHICLE DOUBLE-CLUTCH TRANSMISSION WITH GEAR SHIFT DEVICE COMPRISING A ROTARY DRUM AND MOTOR-VEHICLE HYBRID PROPULSION SYSTEM INCLUDING SUCH A TRANSMISSION - A transmission includes a first primary shaft carrying driving gearwheels for odd gears and reverse, a coaxial second primary shaft carrying driving gearwheels for the even gears, and a secondary shaft carrying idle driven gearwheels meshing with the driving gearwheels. The gearbox has a gear shift device having sliding engagement sleeves each arranged to connect a driven gearwheel corresponding to a given gear for rotation with a secondary shaft. Corresponding sliding shift forks cause an engagement sleeve to slide between a neutral and shift positions. A rotary drum has grooves on its cylindrical surface in which a stud slides, and is connected for translation with a respective shift fork in its sliding direction. An actuation unit rotates the drum stepwise among angular positions corresponding to engagement sleeves' predetermined positions. In a first angular position the engagement sleeves simultaneously engage gear reverse. | 04-18-2013 |