Patent ID: 8695480

Claim:
A device for driving a piston pump, including at least one cam mounted on a camshaft and cooperating with the pump piston, or a component arranged between the cam and the pump piston, to generate a reciprocating movement of the pump piston, said cam having a cam elevation curve with a first section for the upward stroke and a second section for the downward stroke, characterized in that the cam elevation curve ( 15 , 18 ), departing from a shape substantially corresponding to that of a sine wave ( 14 , 19 ), is modified in a manner so that an increase in the piston acceleration occurs at the beginning of the upward stroke and a decrease of the piston deceleration occurs at the end of the upward stroke, wherein the cam elevation curve ( 18 ) in its first section has a shape resulting from the superposition of a semi-oscillation of a first sine wave ( 19 ) with a second sine wave ( 20 ), said second sine wave ( 20 ) having twice the frequency of, and a lower amplitude than, said first sine wave ( 19 ).