Patent ID: 6736218
Filing Date: 2004-05-18
Classification: E02D

Abstract:
A diesel hammer system for driving a pile, comprising:a housing; an anvil member supported by the housing; a clamp assembly adapted to connect the anvil member to the pile; a ram member disposed within the housing; a fuel pump system for injecting fuel into a combustion chamber defined by the housing, anvil member, and the ram member, the fuel pump system comprising a pump housing defining a fuel chamber, a pump piston disposed partly within the fuel chamber, a pump lever that engages the pump piston, a cam member, where an angular position of the cam member acts on the pump lever to determine a position of the pump piston within the fuel chamber and thus determine an effective volume of the fuel chamber; and an actuator assembly arranged to change the angular position of the cam member, where the actuator assembly comprises a control pinion operatively connected to the cam member such that rotation of the control pinion causes angular movement of the cam member, a control rack operatively engaged with the control pinion such that axial displacement of the control rack causes rotation of the control pinion, and a control assembly for causing axial displacement of the control rack; whereby movement of the ram member from an upper position into an impact position causes the ram member to act on the pump piston through the pump lever to force fuel out of the fuel chamber and into the combustion chamber; operation of the actuator assembly determines the volume of fuel forced out of the fuel chamber and into the combustion chamber based on an angular position of the cam member; and operation of the control assembly determines the angular position of the cam member and thus the volume of fuel forced into the combustion chamber.