RPM Regulator for fuel injection pumps in internal combustion engines
AssigneeRobert Bosch GmbH
InventorWalter Berner
Life of this patent
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Abstract
In an rpm limit shut-off regulation effected by a piston which is displaceable by the rpm-dependent pressure of a regulator fluid and which limits the injection quantity, it is proposed to influence the shut-off curve via a pressure roller which engages a contact surface of the piston. The shut-off curve can be selected to be steeper or flatter over the entire range or a partial range. However, without requiring additional means, the full-load injection quantity can also be influenced in accordance with the rpm. To this end, rapidly rotating parts with necessarily resulting high wear are not required.
Claims15
An rpm regulator for fuel injection pumps for internal combustion engines comprising a first housing forming an injection pump suction chamber, an injection pump within said first housing at least one control lever for a control sleeve of said injection pump which doses the injection quantity, a spring loaded piston movable within a second housing in response to rpm-dependent pressure means of a regulator fluid, said piston arranged to cooperate with a stop means which limits the injection quantity, said piston being displaceable against a spring in response to the pressure of the regulator fluid to create a pressure-dependent axial displacement and said piston and having at least one contact surface arranged to roll against a pressure roller means, said pressure roller means being subjected to fluid pressure influences in said suction chamber, to create a pressure-dependent force of said roller means, the movement of said piston within said second housing being responsive to the form of said contact surface, the force of said pressure roller means and the pressure-dependent axial displacement of the piston against the spring.
Dependencies are inferred from the claim text.