Patent ID: 7798300

Claim:
Transmission module for an engine-transmission unit, in particular for motor vehicles, comprising: a movement input shaft intended to be connected to a thermal engine, a movement output shaft intended to be connected to a gear box, a connecting clutch between the two shafts, an autonomous casing comprising: a first half-shell supporting the input shaft movable in rotation, and a second half-shell supporting the output shaft movable in rotation and coaxial to said input shaft, wherein the two half-shells form a sealed housing containing (i) the clutch in a naturally engaged position, (ii) a mechanical member for maintaining the clutch in this engaged position via a piston in the shape of a disc, (iii) a hydraulic control circuit for controlling this clutch in unclutched position by acting directly on said piston against said mechanical member, wherein the hydraulic control circuit comprises a control supply line and a control chamber, and (iv) a hydraulic circuit for lubrication and cooling of said clutch, wherein the hydraulic lubrication circuit comprises a lubrication supply line and a lubrication chamber, wherein the control supply line and the control chamber are separate from the lubrication circuit, wherein the clutch comprises: a first plate integral with the input shaft, said first plate carrying a first series of discs, and a second plate integral with the output shaft, said second plate carrying a second series of discs disposed between the discs of the first series, said discs being movable in axial translation with respect to one another and returned toward each other under the action of the mechanical member for maintaining the clutch in engaged position, a sleeve concentric with a barrel of the second half-shell, a part fixed in translation with respect to the second half-shell, said part being carried by the sleeve, and a piston mounted slidable with respect to said sleeve and acting on the first series of discs of the clutch, wherein the mechanical member for maintaining the clutch in engaged position comprises at least one elastic element interposed between said part and the piston, wherein the lubrication supply line of the hydraulic lubrication circuit comprises a longitudinal channel provided in a barrel of the second half-shell and comprising an input connected to a supply of pressurized fluid and an output opening into a space formed between the piston and the second plate, and wherein the longitudinal channel is connected, by a through bore, to an axial passage provided in the output shaft and communicating, on the one hand, with a space formed between the first and second plates, and on the other hand, with an axial passage provided in the input shaft and communicating, by a transversal bore, with a space formed between the two half-shells, the part, and the first plate.