Spring cup for a primary suspension of a rail vehicle

1. A spring cup for a primary suspension of a rail vehicle, the spring cup having a longitudinal axis and a spring base for transmitting occurring forces onto a chassis frame of the rail vehicle, the spring cup comprising:

a spring seat for receiving at least one spring element, said spring seat being supported against the spring base of the spring cup;

wherein a central section of the spring seat is formed as a contact element having a contact surface for an emergency spring device; and

wherein the spring seat is configured such that a force acting on the contact surface is transferred into the spring base outside of a projection surface which results from a projection of at least the contact surface along the longitudinal axis onto the spring base.

2. The spring cup as claimed in claim 1 , wherein the spring seat includes a supporting surface which is in contact with the spring base outside of the projection surface and transfers the force acting on the contact surface into the spring base.

3. The spring cup as claimed in claim 2 , wherein the spring seat in a region of the projection surface is separated from the spring base in a direction of the longitudinal axis.

4. The spring cup as claimed in claim 2 , wherein the supporting surface is annular.

5. The spring cup as claimed in claim 3 , wherein the supporting surface is annular.

6. The spring cup as claimed in claim 4 , wherein a wall thickness of the annular supporting surface lies in a range between 10% and 30% of a radius of the spring seat.

7. The spring cup as claimed in claim 6 , wherein the wall thickness of the annular supporting surface lies in a range between 15% and 25% of the radius of the spring seat.

8. The spring cup as claimed in claim 2 , wherein the supporting surface is radially separated from the projection surface relative to the longitudinal axis.

9. The spring cup as claimed in claim 2 , wherein the spring seat includes a receiving surface for at least one spring element of the primary suspension on a side opposite to the spring base; and wherein the receiving surface radially and at least sectionally overlaps the supporting surface.

10. The spring cup as claimed in claim 9 , wherein the supporting surface includes at least a radially outermost region of the spring seat relative to the longitudinal axis.

11. The spring cup as claimed in claim 9 , wherein the supporting surface corresponds to a projection of the receiving surface in the direction of the longitudinal axis.

12. The spring cup as claimed in claim 10 , wherein the supporting surface corresponds to a projection of the receiving surface in the direction of the longitudinal axis.

13. The spring cup as claimed in claim 9 , wherein the supporting surface corresponds to a projection of a section of the receiving surface which is intended to receive the spring element that is radially outermost relative to the longitudinal axis.

14. The spring cup as claimed in claim 10 , wherein the supporting surface corresponds to a projection of a section of the receiving surface which is intended to receive the spring element that is radially outermost relative to the longitudinal axis.

15. The spring cup as claimed in claim 2 , wherein the spring seat with an exception of the supporting surface is separated from the spring base in a direction of the longitudinal axis.

16. A primary suspension of a rail vehicle for a sprung attachment of a wheelset bearing of the rail vehicle to a chassis frame of the rail vehicle, comprising:

at least one spring element;

an emergency spring device; and

a spring cup having a longitudinal axis and a spring base for transmitting occurring forces onto a chassis frame of the rail vehicle, the spring cup comprising:

a spring seat for receiving at least one spring element, said spring seat being supported against the spring base of the spring cup, a central section of the spring seat being formed as a contact element having a contact surface for an emergency spring device, and the spring seat being configured such that a force acting on the contact surface is transferred into the spring base outside of a projection surface which results from a projection of at least the contact surface along the longitudinal axis onto the spring base;

wherein the at least one spring element is accommodated in the spring seat and the emergency spring device and can contact the contact surface.

17. The primary suspension as claimed in claim 16 , wherein the supporting surface corresponds at least to a projection of a spring element in a direction of the longitudinal axis.

18. The primary suspension as claimed in claim 16 , wherein the at least one spring element is formed as a first coil spring and a further coil spring which are arranged concentrically relative to the longitudinal axis, and wherein the supporting surface corresponds to a projection of the first coil spring, said supporting surface being radially outermost relative to the longitudinal axis.

19. The primary suspension as claimed in claim 17 , wherein the at least one spring element is formed as a first coil spring and a further coil spring which are arranged concentrically relative to the longitudinal axis, and wherein the supporting surface corresponds to a projection of the first coil spring, said supporting surface being radially outermost relative to the longitudinal axis.