High pressure fuel pump and associated drive device
The present disclosure relates to internal combustion engines in general. Some embodiments may include a drive device for a high-pressure fuel pump of an internal combustion engine. It may include an eccentric ring in frictional connection with a drive shaft for converting a rotational movement of the drive shaft about a drive shaft rotational axis into a translational movement; a tappet spaced apart from the eccentric ring for passing on the translational movement from the eccentric ring; and at least two pivoting bodies disposed between the eccentric ring surface and the tappet surface and in contact with the eccentric ring surface and with the tappet surface. The eccentric ring may include at least one flat eccentric ring surface. The tappet may include at least one flat tappet surface. The pivoting bodies may each include a respective extension axis running parallel to the drive shaft rotational axis and pivot about the extension axis.
1. A drive device a high-pressure fuel pump of an internal combustion engine, the drive device comprising:
an eccentric ring in frictional connection with a drive shaft for converting a rotational movement of the drive shaft about a drive shaft rotational axis into a translational movement;
wherein the eccentric ring includes at least one flat eccentric ring surface;
a tappet spaced apart from the eccentric ring for passing on the translational movement from the eccentric ring;
wherein the tappet includes at least one flat tappet surface; and
at least two pivoting bodies disposed between the eccentric ring surface and the tappet surface and in contact with the eccentric ring surface and with the tappet surface;
wherein the pivoting bodies each include a respective extension axis running parallel to the drive shaft rotational axis;
wherein the pivoting bodies pivot about the extension axis.
2. The drive device as claimed in claim 1 , wherein the pivoting bodies each include a respective first contact surface in contact with the tappet surface and a second contact surface in contact with the eccentric ring surface, wherein the first or the second contact surface is arched about the extension axis.
3. The drive device as claimed in claim 2 , wherein the first or the second contact surface is convexly arched about the extension axis.
4. The drive device as claimed in claim 1 , wherein the pivoting bodies each include at least one respective lateral surface substantially perpendicular to the eccentric ring surface and the tappet surface, and wherein the at least one respective lateral surface convex, wherein the convex lateral surface has a different curvature to a convex first or second contact surface.
5. The drive device as claimed in claim 1 , wherein:
the pivoting bodies include an elongation along an axis of the translational movement, and
a length of the pivoting bodies along the axis of the translational movement lies in a range from 7 mm to 20 mm.
6. The drive device as claimed in claim 1 , wherein:
the tappet comprises a bucket tappet, and
the tappet surface is formed on an underside of the bucket tappet, the underside directed towards the eccentric ring.
7. The drive device ( 42 ) as claimed in claim 1 , wherein
the tappet includes at least one tappet securing projection arranged next to the tappet surface and projecting in the direction of the eccentric ring, for securing the pivoting bodies on the tappet surface.
8. The drive device as claimed in claim 1 , wherein
the eccentric ring includes at least one eccentric ring securing projection arranged next to the eccentric ring surface and projecting in the direction of the tappet for securing the pivoting bodies on the eccentric ring surface.
9. The drive device as claimed in claim 1 , further comprising exactly two pivoting bodies disposed between the tappet surface and the eccentric ring surface.
10. The drive device as claimed in claim 1 , further comprising a spring for permanent pretensioning of the tappet and of the pivoting body onto the eccentric ring.