Torque transmission device for a motor vehicle

1. A torque transmission device for a motor vehicle, having a

torque input element formed by a pair of guide washers ( 7 a , 7 b ),

a torque output element in the form of an annular web ( 24 ), said pair of guide washers extending radially on either side of the annular web, and said pair of guide washers and annular web being movable rotationally respectively, and

at least one group of elastic members ( 10 a , 10 b ) mounted between the torque input element ( 7 a , 7 b ) and the torque output element ( 24 ) and acting against the rotation of the torque input element ( 7 a , 7 b ) and the torque output element ( 24 ) with respect to one another, the elastic elements ( 10 a , 10 b ) of said group being arranged in series by means of a phasing member ( 30 ) so that the elastic members ( 10 a , 10 b ) of each group deform in phase with one another, and,

the torque output element ( 24 ) and the phasing member ( 30 ) having first ( 28 a , 33 a ) and second stop means ( 28 b , 33 b ) limiting their relative rotation in two opposite rotation directions (D, R), and,

the torque input element ( 7 a , 7 b ) and the phasing member ( 30 ) having third ( 34 , 17 b ) and fourth stop means ( 34 , 16 b ) limiting their relative rotation in two opposite rotation directions (D, R), and

wherein the torque input element ( 7 a , 7 b ) and the torque output element ( 24 ) have fifth ( 29 , 16 a ) and sixth stop means ( 29 , 17 a ) limiting their relative rotation in two opposite rotation directions (D, R), and

wherein the elastic members ( 10 a , 10 b ) of the group or of each group come into abutment on the one hand against the torque output element, and on the other hand against the torque input element, wherein the annular web ( 24 ) and the phasing member ( 30 ) each have regions ( 26 , 31 ) extending radially and serving for abutment of the elastic members ( 10 a , 10 b ), stop blocks ( 28 a , 28 b , 33 a , 33 b ) extending circumferentially on either side of each of said regions ( 26 , 31 ) so that the stop blocks ( 28 a , 28 b ) of the annular web ( 24 ) are able to come into abutment against the stop blocks ( 33 a , 33 b ) of the phasing member ( 30 ).

2. The device according to claim 1 , wherein the elastic members ( 10 a , 10 b ) are helical compression springs, said stop means being designed to limit compression of the springs ( 10 a , 10 b ) and to prevent the turns of the springs from being contiguous upon compression thereof.

3. The device according to claim 1 , wherein the annular web ( 24 ) has N stop means ( 29 ), the phasing member ( 30 ) has N stop means ( 34 ), and at least one of the guide washers ( 7 a , 7 b ) has 2N projecting elements ( 16 , 17 ) intended to interact during operation with the N stop means ( 29 , 34 ) of the annular web ( 24 ) and of the phasing member ( 30 ), each projecting element ( 16 , 17 ) having two opposite stop faces ( 16 a , 16 b , 17 a , 17 b ), the projecting elements ( 16 , 17 ) being distributed over the circumference of the guide washer ( 7 a ) in two groups, the stop means ( 29 ) of the annular web ( 24 ) being able to come into abutment against first faces ( 16 a ) of the projecting elements ( 16 ) of a first group in a first rotation direction (D), and against first faces ( 17 a ) of the projecting elements ( 17 ) of a second group in a second, opposite rotation direction (R), the stop means ( 34 ) of the phasing member ( 30 ) being able to come into abutment against second faces ( 17 b ) of the projecting elements ( 17 ) of the second group in a first rotation direction (D), and against second faces ( 16 b ) of the projecting elements ( 16 ) of the first group in a second, opposite rotation direction (R).

4. The device according to claim 3 , wherein the stop means of the annular web ( 24 ) and of the phasing member ( 30 ) interacting with the projecting elements ( 16 , 17 ) of the guide washer ( 7 a ) have blocks ( 29 , 34 ) extending from the abutment regions ( 26 , 31 ) of the elastic members ( 10 a , 10 b ), each block ( 29 , 34 ) having two opposite stop faces able to come into abutment against the corresponding stop faces ( 16 a , 16 b , 17 a , 17 b ) of the projecting elements ( 16 , 17 ) of the two groups.

5. The device according to one of claim 3 , wherein the annular web ( 24 ) has a radially inner annular part ( 25 ) from which abutment tabs ( 26 ) of the elastic members ( 10 a , 10 b ) extend radially outward.

6. The device according to one of claim 1 , wherein the annular web ( 24 ) has a radially inner annular part ( 25 ) from which abutment tabs ( 26 ) of the elastic members ( 10 a , 10 b ) extend radially outward.

7. The device according to claim 1 , wherein the annular web ( 24 ) and the phasing member ( 30 ) each have regions ( 26 , 31 ) extending radially and serving for abutment of the elastic members ( 10 a , 10 b ), able to come to a stop against one another at their inner periphery, upon rotation of the phasing member ( 30 ) with respect to the annular web ( 24 ).

8. The device according to claim 1 , wherein said two guide washers ( 7 a , 7 b ) are fastened to one another by riveting and/or by welding at their radially outer periphery.

9. The device according to claim 1 , wherein at least one ( 7 b ) of the guide washers ( 7 a , 7 b ) has, on its radially outer periphery, deformable lugs ( 14 ) able to be bent onto the other guide washer ( 7 a ) so as to ensure fastening of the one to the other.