Torque converter for a motor vehicle

1. A torque converter for a motor vehicle, comprising:

a torque input element ( 19 ) non-rotatably coupled to a crankshaft ( 1 );

an impeller wheel ( 3 ) non-rotatably coupled to the torque input element ( 19 ) and configured to hydrokinetically drive a turbine wheel ( 4 ) through a reactor ( 5 ), a torque output element ( 8 ), intended to be coupled to a transmission input shaft ( 2 ), clutch device ( 10 , 38 ) movable between an engaged position in which the torque input element ( 19 ) and the torque output element ( 8 ) are rotationally coupled, and a disengaged position in which the torque input element ( 19 ) and the torque output element ( 8 ) are rotationally coupled through the impeller wheel ( 3 ) and the turbine wheel ( 4 );

a first bearing ( 31 ) axially mounted between the impeller wheel ( 3 ) and the reactor ( 5 ); and

a second bearing ( 31 ′) axially mounted between the reactor ( 5 ) and the turbine wheel ( 4 ),

at least one of the first bearing and the second bearing comprising a friction ring ( 31 , 31 ′),

the first bearing ( 31 ) and the second bearing ( 31 ′) being axially separated from one another by the reactor ( 5 );

the reactor ( 5 ) comprising a hub ( 14 ) and blades 13 extending radially outwardly from the hub ( 14 ), the hub ( 14 ) having a first radial surface ( 15 ) and an axially opposite second radial surface ( 16 );

the friction ring ( 31 , 31 ′) comprising an axially extending coupling pad ( 32 ) disposed in a recess ( 33 , 37 ) in one of the impeller wheel ( 3 ), the turbine wheel ( 4 ) and the hub ( 14 ) of the reactor ( 5 );

the coupling pad ( 32 ) being complementary to the recess ( 33 , 37 ) so as to non-rotatably couple the friction ring ( 31 , 31 ′) to one of the impeller wheel ( 3 ), the turbine wheel ( 4 ) and the hub ( 14 ) of the reactor ( 5 ).

2. The torque converter according to claim 1 , wherein the first bearing comprises a first friction ring ( 31 ) non-rotatably coupled to one of the reactor ( 5 ) and the impeller wheel ( 3 ), and wherein another one of the reactor ( 5 ) and the impeller wheel ( 3 ) is configured to rest and rub on the first bearing friction ring ( 31 ).

3. The torque converter according to claim 2 , wherein the second bearing comprises a second friction ring ( 31 ′) non-rotatably coupled to one of the turbine wheel ( 4 ) and the reactor ( 5 ), and wherein another one of the turbine wheel ( 4 ) and the reactor ( 5 ) is configured to rest and rub on the second friction ring ( 31 ′).

4. The torque converter according to claim 3 , wherein the first friction ring ( 31 ) and the second friction ring ( 31 ′) have identical structures.

5. The torque converter according to claim 3 , wherein one of the first friction ring ( 31 ) and the second friction ring ( 31 ′) comprises the coupling pad ( 32 ) engaged in the recess ( 33 , 37 ) in one of the impeller wheel ( 3 ), the turbine wheel ( 4 ) and the hub ( 14 ) of the reactor ( 5 ), and wherein the coupling pad ( 32 ) is complementary to the recess ( 33 , 37 ) so as to non-rotatably couple the first friction ring ( 31 ) to one of the impeller wheel ( 3 ) and the hub ( 14 ) of the reactor ( 5 ) or to non-rotatably couple the second friction ring ( 31 ′) to one of the turbine wheel ( 4 ) and the hub ( 14 ) of the reactor ( 5 ).

6. The torque converter according to claim 3 , wherein at least one of the first friction ring ( 31 ) and the second friction ring ( 31 ′) comprises at least one first oil circulation channel ( 34 ) which is radially spaced from and extends parallel to an axis (X) of the torque converter, and which opens into a lubricated space of the torque converter.

7. The torque converter according to claim 3 , wherein the first friction ring ( 31 ) comprises a first axially extending coupling pad ( 32 ) engaged in the recess ( 33 ) in the hub ( 14 ) of the reactor ( 5 ), wherein the first coupling pad ( 32 ) is complementary to the recess ( 33 ) to non-rotatably couple the first friction ring ( 31 ) to the hub ( 14 ) of the reactor ( 5 ), wherein the second friction ring ( 31 ′) comprises a second axially extending coupling pad ( 32 ) engaged in a recess ( 37 ) in the turbine wheel ( 4 ), and wherein the second coupling pad ( 32 ) is complementary to the recess ( 37 ) to non-rotatably couple the second friction ring ( 31 ′) to the turbine wheel ( 4 ).

8. The torque converter according to claim 2 , wherein the friction ring ( 31 , 31 ′) comprises at least one first oil circulation channel ( 34 ) which is radially spaced from and extends parallel to an axis (X) of the friction ring ( 31 , 31 ′), and which opens into a lubricated space of the torque converter.

9. The torque converter according to claim 1 , wherein the friction ring ( 31 , 31 ′) comprises at least one first oil circulation channel ( 34 ) which is radially spaced from and extends parallel to an axis (X) of the torque converter, and which opens into a lubricated space of the torque converter.

10. The torque converter according to claim 9 , wherein the at least one first oil circulation channel ( 34 ) extends axially through the coupling pad ( 32 ).

11. The torque converter according to claim 1 , wherein the friction ring ( 31 , 31 ′) comprises at least one second oil circulation channel ( 35 ) which extends radially and opens at a radial friction surface ( 36 ) of the friction ring ( 31 , 31 ′), with the impeller wheel ( 3 ), the turbine wheel ( 4 ) or the reactor ( 5 ) being adapted to rest on and pivot relative to the radial friction surface ( 36 ).

12. The torque converter according to claim 11 , wherein the reactor ( 5 ) comprises an annular backing plate ( 17 ) attached to a hub ( 14 ) of the reactor ( 5 ) and having a radial surface ( 18 ) resting on the friction surface ( 36 ) of the friction ring ( 31 , 31 ′).

13. The torque converter according to claim 1 , wherein the friction ring ( 31 , 31 ′) is made of a synthetic material.