Apparatus for pressure control in a fuel feed of an internal combustion engine having common rail injection

1. An apparatus ( 1 ) for pressure control in a fuel feed of an internal combustion engine having common rail injection, comprising:

a housing ( 10 ) with an opening ( 15 ); and

a high pressure valve ( 30 ),

wherein a uniform mating surface ( 16 ) is provided in the opening ( 15 ) on the housing ( 10 ),

wherein the high pressure valve ( 30 ) is at least partially inserted on an end side into the opening ( 15 ) of the housing ( 10 ),

wherein, in the inserted state, the high pressure valve ( 30 ) in the opening ( 15 ) is connected by a connection ( 20 ) in a pressure-tight manner to the housing ( 10 ) and the connection ( 20 ) comprises a first portion ( 21 ), a second portion ( 22 ), and a third portion ( 23 ),

wherein the first portion ( 21 ) the second portion ( 22 ) and the third portion ( 23 ) divide a hollow shaft section ( 34 ) into three step-shaped outer surfaces ( 37 a , 37 b , 37 c ) having different mechanical and/or geometrical properties, and

wherein the third portion ( 23 ) forms a press-fit connection having a smaller interference than an interference of the first portion ( 21 ) and/or an interference of the second portion ( 22 ).

2. The apparatus ( 1 ) according to claim 1 ,

wherein the first portion ( 21 ) is formed in a manner that supports the sealing by a pressure applied to the end side of the high pressure valve ( 30 ), and that in the second portion ( 22 ) an interference fit forms a press-fit connection.

3. The apparatus ( 1 ) according to claim 1 ,

wherein the housing ( 10 ) is a housing ( 10 ) of a high pressure pump or is a common rail housing ( 10 ), and the common rail housing ( 10 ) is in connection on an inlet side to a high pressure pump and on an output side to at least one injector.

4. The apparatus ( 1 ) according to claim 1 ,

wherein a rigidity of the high pressure valve ( 30 ) in the first portion ( 21 ) is lesser than in the second portion ( 22 ), and the pressure applied at the end side can elastically deform the high pressure valve ( 30 ) in the first portion ( 21 ).

5. The apparatus ( 1 ) according to claim 1 ,

wherein a rigidity of the high pressure valve ( 30 ) is lesser than a rigidity of the housing ( 10 ) in an area of the opening ( 15 ).

6. The apparatus ( 1 ) according to claim 1 ,

wherein a press-fit connection between the high pressure valve ( 30 ) and the housing ( 10 ) is formed in the first portion ( 21 ) by an interference fit.

7. The apparatus ( 1 ) according to claim 1 ,

wherein an interference fit is formed in the second portion ( 22 ), which has a smaller interference than the interference in the first portion ( 21 ), and a press-fit connection is formed between the high pressure valve ( 30 ) and the housing ( 10 ).

8. The apparatus ( 1 ) according to claim 1 ,

wherein the high pressure valve ( 30 ) has a valve seat body ( 32 ), and the valve seat body ( 32 ) of the high pressure valve ( 30 ) is at least partially inserted into the opening ( 15 ) of the housing ( 10 ).

9. The apparatus ( 1 ) according to claim 8 ,

wherein the valve seat body ( 32 ) has a circular annular cross-section at an end side with an inner surface ( 36 ) surrounding an inlet channel ( 35 ) and the outer surfaces ( 37 a , 37 b , 37 c ), and wherein the outer surface ( 37 b ) is provided with an interference to form the second portion ( 22 ).

10. The apparatus ( 1 ) according to claim 8 ,

wherein the valve seat body ( 32 ) has a circumferential cavity ( 31 ) on an inner surface ( 36 ) and/or on the outer surface ( 37 a ) for forming the first portion ( 21 ).

11. The apparatus ( 1 ) according to claim 8 ,

wherein the third portion ( 23 ) is arranged at an end side of the valve seat body ( 32 ) and the second portion ( 22 ) is arranged between the third portion ( 23 ) and the first portion ( 21 ).

12. The apparatus ( 1 ) according to claim 1 ,

wherein the high pressure valve ( 30 ) is a pressure control valve or a regulating valve.

13. The apparatus ( 1 ) according to claim 1 ,

wherein the high pressure valve ( 30 ) has a pole core ( 40 ) with a front cavity ( 44 ) which cavity engages the valve seat body ( 32 ).

14. The apparatus ( 1 ) according to claim 13 ,

wherein the housing ( 10 ) at least partially surrounds the pole core ( 40 ) and is fixedly connected to the pole core ( 40 ).

15. The apparatus ( 1 ) according to claim 13 ,

wherein the housing ( 10 ) is welded, caulked, flanged or crimped to the pole core ( 40 ).

16. The apparatus ( 1 ) according to claim 1 ,

wherein the housing ( 10 ) is made of a magnetic material and an excitation system ( 50 ) of the high pressure valve ( 30 ) is arranged on the common rail housing ( 10 ).

17. An internal combustion engine with a common rail injection, comprising at least one apparatus ( 1 ) according to claim 1 .

18. The apparatus ( 1 ) according to claim 12 , wherein the pressure control valve comprises an electromagnetic pressure control valve.