Hydraulic amplifier
OwnerEllsworth W. Lappinventor
Life of this patent
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Abstract
A hydraulic amplifier having a hydraulic motor adapted to drive a high pressure pump for boosting the pressure of low pressure fluid and for supplying high pressure fluid to a hydraulic actuator. The motor also drives a scavenging pump for overcoming high back pressure in the return side of the system. The amplifier is controlled by two valves which may be actuated by manually operating a single lever.
Claims16
A hydraulic amplifier operable to receive low pressure fluid from a low pressure pump, to increase the pressure of said fluid and to deliver high pressure fluid to a hydraulic utilization device, said amplifier comprising a hydraulic motor, a high pressure pump, means for connecting said motor to said high pressure pump and operable to drive said high pressure pump when said motor is actuated by low pressure fluid supplied by said low pressure pump, said high pressure pump being operable when driven and when supplied with low pressure fluid from said low pressure pump to increase the pressure of such fluid, the improvement in said amplifier comprising, a first valve normally disposed in a first position blocking the flow of low pressure fluid from said low pressure pump to said motor and to said high pressure pump, said first valve being movable to a second position permitting low pressure fluid to flow from said low pressure pump to said motor and to said high pressure pump, a second valve normally disposed in a first position blocking the flow of high pressure fluid from said high pressure pump to said utilization device, said second valve being movable to a second position permitting high pressure fluid to flow from said high pressure pump to said utilization device, a first actuator associated with said first valve and operable when manually moved in one direction to cause said first valve to shift from its first position to its second position, a second actuator associated with said second valve and operable when moved in a predetermined direction to cause said second valve to shift from its first position to its second position, said first actuator being operable when moved in said one direction to first cause said first valve to shift to its second position and then to move said second actuator in said predetermined direction to cause said second valve to shift to its second position.
A hydraulic amplifier operable to receive low pressure fluid from a low pressure pump, to increase the pressure of said fluid, and to deliver high pressure fluid to a hydraulic utilization device, said amplifier being selectively operable to conduct fluid from said utilization device to a reservoir associated with said pump, said amplifier comprising a hydraulic motor connected to receive and be actuated by part of the low pressure fluid delivered from said pump, a high pressure pump connected to receive part of the low pressure fluid delivered from said low pressure pump and operable when driven to increase the pressure of such fluid, means connecting said high pressure pump with said motor and operable to drive said high pressure pump when said motor is actuated, and a scavenging pump connected to be driven by said motor and having an outlet adapted to communicate with said reservoir, the improvement in said amplifier comprising, a first valve normally disposed in a first position blocking the flow of low pressure fluid from said low pressure pump to said motor and to the inlet of said high pressure pump and blocking the flow of fluid from the outlet of said scavenging pump to said reservoir, said first valve being movable in one direction from said first position to an intermediate position and then to a second position, said first valve being operable when in said intermediate position to permit low pressure fluid to flow from said low pressure pump to said motor, to permit fluid to flow from said scavenging pump to said reservoir and to block the flow of low pressure fluid from said low pressure pump to said high pressure pump, said first valve being operable when in said second position to permit low pressure fluid to flow from said low pressure pump to said motor and said high pressure pump and to permit fluid to flow from said scavenging pump to said reservoir, and a second valve normally disposed in a first position blocking the flow of high pressure fluid from said high pressure pump to said utilization device and permitting fluid to flow from said utilization device to said scavenging pump, said second valve being manually movable to a second position when said first valve is in its second position, said second valve being operable when in its second position to permit the flow of high pressure fluid from said high pressure pump to said utilization device and to block the flow of fluid from said utilization device to said scavenging pump.
A hydraulic amplifier operable to receive low pressure fluid from a low pressure pump, to increase the pressure of said fluid, and to deliver high pressure fluid to a hydraulic utilization device, said amplifier being selectively operable to conduct fluid from said utilization device to a reservoir associated with said pump, said amplifier comprising a hydraulic motor connected to receive and be actuated by part of the low pressure fluid delivered from said pump, a high pressure pump connected to receive part of the low pressure fluid delivered from said low pressure pump and operable when driven to increase the pressure of such fluid, a shaft connecting said high pressure pump with said motor and operable to drive said high pressure pump when said motor is actuated, and a scavenging pump connected to be driven by said shaft and having an outlet adapted to communicate with said reservoir, said amplifier being characterized in that a passage is formed axially through said shaft to establish communication between said low pressure pump and the inlet of said high pressure pump, a first valve movable between a first position preventing the flow of low pressure fluid from said low pressure pump to said passage and a second position permitting such flow, and a second valve selectively movable between a first position connecting the inlet of said scavenging pump with said utilization device and a second position connecting the outlet of said high pressure pump with said utilization device.
Dependencies are inferred from the claim text.