Device for recovering energy
AssigneeHydac Technology GmbH
InventorsPeter Kloft, Daniel Feld, Herbert Baltes, Frank Bauer
Life of this patent
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Abstract
A device recovers energy in working machines with at least one power drive actuated to move a load mass back and forth and with an energy storage system (16) absorbing the energy released in the movement of the load mass in one direction and making it available for a subsequent movement in the other direction. The energy storage system includes an accumulator cylinder (16) mechanically coupled to the load mass and storing pneumatic pressure energy for movement in one direction. For movement in the other direction, the accumulator cylinder acts as an auxiliary working cylinder supporting the power drive and converting the stored pressure energy into driving force.
Claims26
A device for recovering energy in working machines with at least one power drive actuatable to move a load mass back and forth and with an energy storage system absorbing energy released in movement of the load mass in a first direction and making that energy available for subsequent movement in a second direction, the device comprising:
- an accumulator cylinder mechanically coupled to the load mass, storing pneumatic pressure in the first direction and acting as an auxiliary working cylinder supporting the power drive in the second direction by converting stored pressure energy into a driving force, said accumulator cylinder including
- a cup having an open end and an inner surface,
- a piston movable within said cup and having an outside surface and an open end with said cup and said piston forming a main chamber in said accumulator cylinder,
- a first surface guide on said open end of said cup engaging said outside surface of said piston, guiding movement of said piston and spacing said outside surface of said piston from said inner surface of said cup at a distance,
- a second guide on said open end of said piston engaging said inner surface of said cup, guiding movement of said piston and spacing said outside surface of said piston from said inner surface of said cup at the distance, and
- an oil gap defined by and formed and maintained between said first and second guides and between said outside surface of said piston and said inner surface of said cup, and
- an axially movable seal in said oil gap separating an oil side with an oil charge from a gas side with a gas charge forming a hydraulic accumulator in said oil gap, said gas side being sealed and blocked from fluid communication with said main chamber.
A device for recovering energy in working machines with at least one power drive actuatable to move a load mass back and forth and with an energy storage system absorbing energy released in movement of the load mass in a first direction and making that energy available for subsequent movement in a second direction, the device comprising:
- an accumulator cylinder mechanically coupled to the load mass, storing pneumatic pressure in the first direction and acting as an auxiliary working cylinder supporting the power drive in the second direction by converting stored pressure energy into a driving force, said accumulator cylinder including
- a cup having an open end and an inner surface with a first diameter surrounding a hollow interior extending from said open end of said cup,
- a piston movable within said cup and having a piston rod including an outer surface with a second diameter less than said first diameter to define an oil gap between said outer surface of said piston rod and said inner surface of said cup, said cup and said piston forming a main chamber in said accumulator cylinder, said piston rod having a hollow inner chamber extending from an open end of said piston and being open to said hollow interior of said cup, and
- an axially movable seal in said oil gap separating an oil side with an oil charge from a gas side with a gas charge forming a hydraulic accumulator in said oil gap, said gas side being sealed and blocked from fluid communication with said main chamber.
An accumulator cylinder, comprising:
- a cup having an open end and an inner surface defining a main chamber;
- a piston movable within said cup and having an outside surface and an open end and an opposite closed end, said cup and said piston forming a main chamber;
- a first guide on said open end of said cup engaging said outside surface of said piston, guiding movement of said piston and spacing said outside surface of said piston from said inner surface of said cup at a distance;
- a second guide on said open end of said piston engaging said inner surface of said cup, guiding movement of said piston and spacing said outside surface of said piston from said inner surface of said cup at the distance;
- an oil gap defined by and formed and maintained between said first and second guides and between said outside surface of said piston and said inner surface of said cup;
- and
- an axially movable seal in said oil gap separating an oil side with an oil charge from a gas side with a gas charge forming a hydraulic accumulator in said oil gap, said gas side being sealed and blocked from fluid communication with said main chamber.
Dependencies are inferred from the claim text.