Press-driven tool actuation system

A press-driven hydraulic power device, comprising:

• a pump including a pump piston, a pump cylinder that houses hydraulic fluid in a pressure chamber on one side of the pump piston, a bearing and seal assembly carried in an open end of the pump cylinder, and a piston rod received in the bearing and seal assembly and extending from the open end of the pump cylinder to be actuated by a press ram to displace the pump piston in the pump cylinder;
• an accumulator in downstream fluid communication with the pressure chamber of the pump, and including an accumulator piston disposed in an accumulator cylinder that houses hydraulic fluid in an accumulation chamber on one side of the accumulator piston and houses a gas in a gas chamber on another side of the accumulator piston;
• a body supporting the hydraulic pump and hydraulic accumulator thereon and being in fluid communication between the pump and accumulator cylinders, and including a pressure relief valve downstream of the pump cylinder and upstream of the accumulator cylinder, and further including a check valve downstream of the accumulator cylinder and upstream of the pump cylinder;
• and
• the pump piston being strokeable by movement of a press ram to pressurize hydraulic fluid in the pressure chamber wherein the pressure relief valve opens at a preset hydraulic pressure to relieve hydraulic pressure in the pressure chamber of the pump by allowing hydraulic fluid to flow from the pressure chamber of the pump into the accumulation chamber of the accumulator to displace the accumulator piston against pressure in the gas chamber of the accumulator.