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US 2007/0175209 A1Published application
Hydraulic system having in-sump energy recovery device
AssigneeCaterpillar Inc.
InventorsDavid Smith, Igor Strashny, Daniel Mather
Life of this patent
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Abstract
A hydraulic energy recovery device for a hydraulic system is disclosed. The hydraulic energy recovery device has a first impeller configured to receive a flow of pressurized liquid, and a second impeller configured to pressurize a flow of liquid. The hydraulic energy recovery device also has a common shaft connecting the first and second impellers.
Claims21
A hydraulic energy recovery device, comprising:
- a first impeller configured to receive a flow of pressurized liquid;
- a second impeller configured to pressurize a flow of liquid;
- and
- a common shaft connecting the first and second impellers.
1 more element
A hydraulic system, comprising:
- a low pressure sump configured to hold a supply of liquid;
- a hydraulic actuator;
- a primary pump in fluid communication with the low pressure sump and the hydraulic actuator, the primary pump configured to draw liquid from the low pressure sump, pressurize the liquid, and direct the pressurized liquid to the hydraulic actuator;
- and
- an energy recovery device disposed downstream of the hydraulic actuator, the energy recovery device including:
- a motor configured to receive a flow of waste liquid from the hydraulic actuator;
- and
- a transfer pump in communication with the low pressure sump and operatively driven by the motor.
5 more elements
A method of recovering energy from a hydraulic circuit, comprising:
- pressurizing liquid to a first predetermined level;
- directing the pressurized liquid to a hydraulic actuator;
- draining liquid from the hydraulic actuator;
- and
- using the draining liquid to pressurize liquid to a second predetermined level.
2 more elements
Dependencies are inferred from the claim text.