Electromagnetically actuatable intake valve for a high-pressure pump, and high-pressure pump
The invention relates to an electromagnetically actuatable intake valve for a high-pressure pump of a fuel injection system, in particular a common rail injection system, comprising a magnet coil ( 1 ) for acting on an armature ( 2 ) which is received and guided such that it can be moved with a reciprocating movement in a central recess ( 3 ) of a valve body ( 4 ), wherein a pole core ( 6 ) which is connected via a sleeve ( 7 ) to the valve body ( 4 ) lies opposite the armature ( 2 ) at a working air gap ( 5 ). According to the invention, the valve body ( 4 ) has a circumferential cut-out ( 9 ) within an inner circumferential surface ( 8 ) which delimits the recess ( 3 ), which cut-out ( 9 ) divides the inner circumferential surface ( 8 ) into an upper and a lower guide region ( 10, 11 ). The invention also relates to a high-pressure pump for a fuel injection system, in particular a common rail injection system, comprising said type of intake valve.
1. An electromagnetically actuable suction valve for a high pressure pump of a fuel injection system, comprising a magnet coil ( 1 ) for acting on an armature ( 2 ) which is received and guided such that the armature can be moved with a reciprocating movement in a central recess ( 3 ) of a valve body ( 4 ), and a pole core ( 6 ) which is connected via a sleeve ( 7 ) to the valve body ( 4 ) lying opposite the armature ( 2 ) at a working air gap ( 5 ), characterized in that the valve body ( 4 ) has a circumferential cutout ( 9 ) within an inner circumferential face ( 8 ) which delimits the recess ( 3 ), wherein the cutout ( 9 ) divides the inner circumferential face ( 8 ) into an upper guide region and a lower guide region ( 10 , 11 ), wherein the sleeve ( 7 ) is welded to the valve body ( 4 ) in a region of the circumferential cutout ( 9 ).
2. The suction valve as claimed in claim 1 , characterized in that the sleeve ( 7 ) is welded to the valve body ( 4 ) at a level of the circumferential cutout ( 9 ) such that a resulting weld seam between the sleeve ( 7 ) and the valve body ( 4 ) has no influence on the upper guide region ( 10 ) or the lower guide region ( 11 ) of the circumferential face ( 8 ).
3. The suction valve as claimed in claim 1 , characterized in that the circumferential cutout ( 9 ) is configured as an annular groove, a cross-sectional dimension of which is greater in an axial direction than in a radial direction.
4. The suction valve as claimed in claim 1 , characterized in that the circumferential cutout ( 9 ) has a rectangular cross section.
5. The suction valve as claimed in claim 1 , characterized in that the circumferential cutout ( 9 ) merges via rounded or beveled edges ( 12 ) into the inner circumferential face ( 8 ).
6. The suction valve as claimed in claim 1 , characterized in that the circumferential cutout ( 9 ) is arranged centrally in relation to an armature movement space which is delimited by an upper stroke stop and a lower stroke stop ( 13 , 14 ) for the armature ( 2 ).
7. The suction valve as claimed in claim 6 , characterized in that the upper stroke stop ( 13 ) is formed by the pole core ( 6 ), and the lower stroke stop ( 14 ) is formed by an annular shoulder ( 15 ) of the valve body ( 4 ) or an annular stop element ( 16 ) which is supported on the valve body.
8. The suction valve as claimed in claim 1 , characterized in that the armature ( 2 ) is penetrated by at least one equalizing bore ( 17 ).
9. The suction valve as claimed in claim 1 , characterized in that the armature ( 2 ) comprises a contact pin ( 18 ) for making contact with a valve tappet ( 19 ) of the suction valve.
10. A high pressure pump for a fuel injection system, having a suction valve as claimed in claim 1 and a cylinder head ( 20 ).
11. The high pressure pump as claimed in claim 10 , wherein the suction valve is integrated into the cylinder head.
12. The high pressure pump as claimed in claim 10 , characterized in that the sleeve ( 7 ) is welded to the valve body ( 4 ) at a level of the circumferential cutout ( 9 ).
13. The high pressure pump as claimed in claim 10 , characterized in that the circumferential cutout ( 9 ) is configured as an annular groove, a cross-sectional dimension of which is greater in an axial direction than in a radial direction.
14. The high pressure pump as claimed in claim 10 , characterized in that the circumferential cutout ( 9 ) has a rectangular cross section.
15. The high pressure pump as claimed in claim 10 , characterized in that the circumferential cutout ( 9 ) merges via rounded or beveled edges ( 12 ) into the inner circumferential face ( 8 ).
16. The high pressure pump as claimed in claim 10 , characterized in that the circumferential cutout ( 9 ) is arranged centrally in relation to an armature movement space which is delimited by an upper stroke stop and a lower stroke stop ( 13 , 14 ) for the armature ( 2 ).
17. The high pressure pump as claimed in claim 16 , characterized in that the upper stroke stop ( 13 ) is formed by the pole core ( 6 ), and the lower stroke stop ( 14 ) is formed by an annular shoulder ( 15 ) of the valve body ( 4 ) or an annular stop element ( 16 ) which is supported on the valve body.
18. The high pressure pump as claimed in claim 10 , characterized in that the armature ( 2 ) is penetrated by at least one equalizing bore ( 17 ).
19. The high pressure pump as claimed in claim 10 , characterized in that the armature ( 2 ) comprises a contact pin ( 18 ) for making contact with a valve tappet ( 19 ) of the suction valve.