Fuel injection pump
AssigneeDenso Corporation
InventorsKatsumi Mori, Katsunori Furuta
Life of this patent
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Abstract
A camshaft has a cam having a circular profile. A cam-ring is rotatably arranged on a radial outside of the cam. The cam-ring orbits around the cam. The cam-ring has a metal bush on an inner surface thereon. The cam-ring rotates relative to the cam, but is prevented from a rotation itself. The cam has a groove inclined with respect to a rotating axis of the cam. The groove has openings on both axial ends of the cam. The groove introduces fuel as a lubricant into a gap between the cam and the metal bush. The fuel introduced into the gap improves a lubricity and prevents a sticking.
Claims4
A fuel injection pump, comprising:
- a camshaft having a cam thereon;
- a cam-ring rotatably arranged on a radial outside of the cam and orbiting a rotating axis of the camshaft;
- a housing defining a fuel pressurizing chamber and housing the cam;
- a plunger which reciprocates by following an orbital motion of the cam-ring and pressurizes fuel introduced into the fuel pressurizing chamber, wherein
- an outer surface of the cam defines a concave portion for introducing a lubricant into a gap between the cam and the cam-ring, the concave portion being formed on a region where a force caused by pressurizing fuel is not applied.
Dependencies are inferred from the claim text.