Clutch having a pre-clutch and a main clutch

1. A clutch having a cover plate ( 26 ), a pre-clutch ( 1 ) and a main clutch ( 2 ), where the pre-clutch ( 1 ) can be brought to an engaged or a disengaged state by a tensioning means ( 4 ), the pre-clutch ( 1 ) being connected to the main clutch ( 2 ) by means of an operative connection ( 80 ) in such a way that the disengaged position and the engaged position of the pre-clutch ( 1 ) are transmitted to the main clutch ( 2 ), wherein:

the tensioning means ( 4 ) is biased between said cover plate ( 26 ) and a driver disk ( 7 ) of a clutch basket ( 18 );

the operative connection ( 80 ) has a ramp ( 12 ), a transmitting element ( 13 ) and a pressure plate ( 14 );

the ramp ( 12 ) is coupled with the pre-clutch ( 1 );

the pressure plate ( 14 ) is in an operative connection with the main clutch ( 2 );

the transmitting element ( 13 ) is situated between the ramp ( 12 ) and the pressure plate ( 14 ) to transmit power;

the pressure plate ( 14 ) is directly connected to a clutch core ( 11 ) by spring means ( 82 ) connected to a bolt ( 39 ) of clutch core ( 11 );

said ramp is supported by a needle bearing ( 10 ); and,

said spring means ( 82 ) is a leaf spring.

2. The clutch recited in claim 1 , wherein another ramp ( 31 ) is provided between the transmitting element ( 13 ) and the pressure plate ( 14 ), and that additional spring means ( 15 ) are provided which pre-tension the ramps ( 12 , 31 ) to each other.

3. The clutch recited in claim 1 , wherein the pre-clutch ( 1 ) has a driver disk ( 7 ) and a plate ( 6 ), that the driver disk ( 7 ) is connected axially movably and non-rotatingly to a clutch basket ( 18 ) of the main clutch ( 4 ), while the plate ( 6 ) is rotatably supported on the clutch core ( 11 ), the driver disk ( 7 ) being pre-tensioned by means of first spring elements ( 9 ).

4. The clutch recited in claim 3 , wherein the driver disk ( 7 ) meshes with cogs ( 44 ) in openings ( 43 ) in a cover ( 3 ) of the pre-clutch ( 1 ).

5. The clutch recited in claim 1 , wherein a torque sensor ( 16 ) is situated between the clutch core ( 11 ) and an inner clutch basket ( 17 ) of the main clutch.

6. The clutch recited in claim 1 , wherein the main clutch ( 2 ) has the clutch basket ( 18 ), and that the clutch basket ( 18 ) is made as a punched part.

7. The clutch recited in claim 6 , wherein the clutch basket ( 18 ) is surrounded by a guard ring ( 28 ), where the guard ring ( 28 ) protects the clutch basket ( 18 ) against breaking; and, wherein said guard ring is positioned within said clutch basket ( 18 ).

8. The clutch recited in claim 1 , wherein tubes ( 35 ) are provided to carry oil for lubricating the clutch.

9. The clutch recited in claim 1 , wherein the pre-clutch ( 1 ) and the main clutch ( 2 ) are coupled together by means of a centrifugal clutch ( 60 ).

10. The clutch recited in claim 1 , wherein an equalizing mass ( 70 ) is provided which is coupled with the ramp ( 12 ) and damps acceleration of the ramp ( 12 ).

11. The clutch recited in claim 10 , wherein the ramp ( 12 ) is coupled with the equalizing mass by means of a gear system ( 71 , 72 , 73 ).

12. A clutch having a cover plate ( 26 ), a pre-clutch ( 1 ) and a main clutch ( 2 ), where the pre-clutch ( 1 ) can be brought to an engaged or a disengaged state by a tensioning means ( 4 ), the pre-clutch ( 1 ) being connected to the main clutch ( 2 ) by means of an operative connection ( 80 ) in such a way that the disengaged position and the engaged position of the pre-clutch ( 1 ) are transmitted to the main clutch ( 2 ), wherein:

the tensioning means ( 4 ) is biased between said cover plate ( 26 ) and a driver disk ( 7 ) of a clutch basket ( 18 );

the operative connection ( 80 ) has a ramp ( 12 ), a transmitting element ( 13 ) and a pressure plate ( 14 );

the ramp ( 12 ) is coupled with the pre-clutch ( 1 );

the pressure plate ( 14 ) is in an operative connection with the main clutch ( 2 );

the transmitting element ( 13 ) is situated between the ramp ( 12 ) and the pressure plate ( 14 ) to transmit power;

the pressure plate ( 14 ) is directly connected to a clutch core ( 11 ) by spring means ( 82 );

wherein said ramp is supported by a needle bearing ( 10 ); and,

said spring means ( 82 ) is a leaf spring;

wherein a torque sensor ( 16 ) is situated between the clutch core ( 11 ) and an inner clutch basket ( 17 ) of the main clutch ( 2 ); and,

wherein said torque sensor ( 16 ) is directly connected to said clutch core ( 11 ).